diff --git a/src/Makefile.am b/src/Makefile.am index e39cf14e0..8cb6d5b16 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -1,593 +1,594 @@ # Copyright (c) 2013-2016 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. DIST_SUBDIRS = secp256k1 univalue AM_LDFLAGS = $(PTHREAD_CFLAGS) $(LIBTOOL_LDFLAGS) $(HARDENED_LDFLAGS) AM_CXXFLAGS = $(HARDENED_CXXFLAGS) $(ERROR_CXXFLAGS) AM_CPPFLAGS = $(HARDENED_CPPFLAGS) EXTRA_LIBRARIES = if EMBEDDED_UNIVALUE LIBUNIVALUE = univalue/libunivalue.la $(LIBUNIVALUE): $(wildcard univalue/lib/*) $(wildcard univalue/include/*) $(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C $(@D) $(@F) else LIBUNIVALUE = $(UNIVALUE_LIBS) endif BITCOIN_INCLUDES=-I$(builddir) -I$(builddir)/obj $(BDB_CPPFLAGS) $(BOOST_CPPFLAGS) $(LEVELDB_CPPFLAGS) $(CRYPTO_CFLAGS) $(SSL_CFLAGS) BITCOIN_INCLUDES += -I$(srcdir)/secp256k1/include BITCOIN_INCLUDES += $(UNIVALUE_CFLAGS) BITCOIN_SEEDER_INCLUDES = -I$(srcdir)/seeder BITCOIN_SEEDER_INCLUDES += $(BITCOIN_INCLUDES) LIBBITCOIN_SERVER=libbitcoin_server.a LIBBITCOIN_COMMON=libbitcoin_common.a LIBBITCOIN_CONSENSUS=libbitcoin_consensus.a LIBBITCOIN_CLI=libbitcoin_cli.a LIBBITCOIN_UTIL=libbitcoin_util.a LIBBITCOIN_CRYPTO=crypto/libbitcoin_crypto.a LIBBITCOINQT=qt/libbitcoinqt.a LIBSECP256K1=secp256k1/libsecp256k1.la if ENABLE_ZMQ LIBBITCOIN_ZMQ=libbitcoin_zmq.a endif if BUILD_BITCOIN_LIBS LIBBITCOINCONSENSUS=libbitcoinconsensus.la endif if BUILD_BITCOIN_SEEDER LIBBITCOIN_SEEDER=libbitcoin_seeder.a endif if ENABLE_WALLET LIBBITCOIN_WALLET=libbitcoin_wallet.a endif $(LIBSECP256K1): $(wildcard secp256k1/src/*) $(wildcard secp256k1/include/*) $(AM_V_at)$(MAKE) $(AM_MAKEFLAGS) -C $(@D) $(@F) # Make is not made aware of per-object dependencies to avoid limiting building parallelization # But to build the less dependent modules first, we manually select their order here: EXTRA_LIBRARIES += \ $(LIBBITCOIN_CRYPTO) \ $(LIBBITCOIN_UTIL) \ $(LIBBITCOIN_COMMON) \ $(LIBBITCOIN_CONSENSUS) \ $(LIBBITCOIN_SERVER) \ $(LIBBITCOIN_CLI) \ $(LIBBITCOIN_SEEDER) \ $(LIBBITCOIN_WALLET) \ $(LIBBITCOIN_ZMQ) lib_LTLIBRARIES = $(LIBBITCOINCONSENSUS) bin_PROGRAMS = noinst_PROGRAMS = TESTS = BENCHMARKS = if BUILD_BITCOIND bin_PROGRAMS += bitcoind endif if BUILD_BITCOIN_SEEDER bin_PROGRAMS += bitcoin-seeder endif if BUILD_BITCOIN_UTILS bin_PROGRAMS += bitcoin-cli bitcoin-tx endif .PHONY: FORCE check-symbols check-security # bitcoin core # BITCOIN_CORE_H = \ addrdb.h \ addrman.h \ base58.h \ bloom.h \ blockencodings.h \ blockfileinfo.h \ blockindexworkcomparator.h \ + blockvalidity.h \ cashaddr.h \ cashaddrenc.h \ chain.h \ chainparams.h \ chainparamsbase.h \ chainparamsseeds.h \ checkpoints.h \ checkqueue.h \ clientversion.h \ coins.h \ compat.h \ compat/byteswap.h \ compat/endian.h \ compat/sanity.h \ compressor.h \ config.h \ consensus/consensus.h \ core_io.h \ core_memusage.h \ cuckoocache.h \ diskblockpos.h \ dstencode.h \ fs.h \ globals.h \ httprpc.h \ httpserver.h \ indirectmap.h \ init.h \ key.h \ keystore.h \ dbwrapper.h \ limitedmap.h \ logging.h \ memusage.h \ merkleblock.h \ miner.h \ net.h \ net_processing.h \ netaddress.h \ netbase.h \ netmessagemaker.h \ noui.h \ policy/fees.h \ policy/policy.h \ pow.h \ protocol.h \ random.h \ reverselock.h \ rpc/blockchain.h \ rpc/client.h \ rpc/jsonrpcrequest.h \ rpc/mining.h \ rpc/misc.h \ rpc/protocol.h \ rpc/server.h \ rpc/tojson.h \ rpc/register.h \ scheduler.h \ script/scriptcache.h \ script/sigcache.h \ script/sign.h \ script/standard.h \ script/ismine.h \ streams.h \ support/allocators/secure.h \ support/allocators/zeroafterfree.h \ support/cleanse.h \ support/events.h \ support/lockedpool.h \ sync.h \ threadsafety.h \ threadinterrupt.h \ timedata.h \ torcontrol.h \ txdb.h \ txmempool.h \ ui_interface.h \ undo.h \ util.h \ utilmoneystr.h \ utiltime.h \ validation.h \ validationinterface.h \ versionbits.h \ wallet/coincontrol.h \ wallet/crypter.h \ wallet/db.h \ wallet/finaltx.h \ wallet/rpcdump.h \ wallet/rpcwallet.h \ wallet/wallet.h \ wallet/walletdb.h \ warnings.h \ zmq/zmqabstractnotifier.h \ zmq/zmqconfig.h\ zmq/zmqnotificationinterface.h \ zmq/zmqpublishnotifier.h obj/build.h: FORCE @$(MKDIR_P) "$(builddir)/obj" @$(top_srcdir)/share/genbuild.sh "$(abs_top_builddir)/src/obj/build.h" \ "$(abs_top_srcdir)" libbitcoin_util_a-clientversion.$(OBJEXT): obj/build.h # server: shared between bitcoind and bitcoin-qt libbitcoin_server_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(MINIUPNPC_CPPFLAGS) $(EVENT_CFLAGS) $(EVENT_PTHREADS_CFLAGS) libbitcoin_server_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_server_a_SOURCES = \ addrman.cpp \ addrdb.cpp \ bloom.cpp \ blockencodings.cpp \ chain.cpp \ checkpoints.cpp \ config.cpp \ globals.cpp \ httprpc.cpp \ httpserver.cpp \ init.cpp \ dbwrapper.cpp \ merkleblock.cpp \ miner.cpp \ net.cpp \ net_processing.cpp \ noui.cpp \ policy/fees.cpp \ policy/policy.cpp \ pow.cpp \ rest.cpp \ rpc/abc.cpp \ rpc/blockchain.cpp \ rpc/jsonrpcrequest.cpp \ rpc/mining.cpp \ rpc/misc.cpp \ rpc/net.cpp \ rpc/rawtransaction.cpp \ rpc/server.cpp \ script/scriptcache.cpp \ script/sigcache.cpp \ script/ismine.cpp \ timedata.cpp \ torcontrol.cpp \ txdb.cpp \ txmempool.cpp \ ui_interface.cpp \ validation.cpp \ validationinterface.cpp \ versionbits.cpp \ $(BITCOIN_CORE_H) if ENABLE_ZMQ libbitcoin_zmq_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(ZMQ_CFLAGS) libbitcoin_zmq_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_zmq_a_SOURCES = \ zmq/zmqabstractnotifier.cpp \ zmq/zmqnotificationinterface.cpp \ zmq/zmqpublishnotifier.cpp endif # wallet: shared between bitcoind and bitcoin-qt, but only linked # when wallet enabled libbitcoin_wallet_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) libbitcoin_wallet_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_wallet_a_SOURCES = \ wallet/crypter.cpp \ wallet/db.cpp \ wallet/finaltx.cpp \ wallet/rpcdump.cpp \ wallet/rpcwallet.cpp \ wallet/wallet.cpp \ wallet/walletdb.cpp \ $(BITCOIN_CORE_H) # crypto primitives library crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS) crypto_libbitcoin_crypto_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) crypto_libbitcoin_crypto_a_SOURCES = \ crypto/aes.cpp \ crypto/aes.h \ crypto/chacha20.h \ crypto/chacha20.cpp \ crypto/common.h \ crypto/hmac_sha256.cpp \ crypto/hmac_sha256.h \ crypto/hmac_sha512.cpp \ crypto/hmac_sha512.h \ crypto/ripemd160.cpp \ crypto/ripemd160.h \ crypto/sha1.cpp \ crypto/sha1.h \ crypto/sha256.cpp \ crypto/sha256.h \ crypto/sha512.cpp \ crypto/sha512.h if USE_ASM crypto_libbitcoin_crypto_a_SOURCES += crypto/sha256_sse4.cpp endif # consensus: shared between all executables that validate any consensus rules. libbitcoin_consensus_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) libbitcoin_consensus_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_consensus_a_SOURCES = \ amount.h \ arith_uint256.cpp \ arith_uint256.h \ consensus/merkle.cpp \ consensus/merkle.h \ consensus/params.h \ consensus/validation.h \ feerate.h \ hash.cpp \ hash.h \ prevector.h \ primitives/block.cpp \ primitives/block.h \ primitives/transaction.cpp \ primitives/transaction.h \ primitives/txid.h \ pubkey.cpp \ pubkey.h \ script/bitcoinconsensus.cpp \ script/sighashtype.h \ script/interpreter.cpp \ script/interpreter.h \ script/script.cpp \ script/script.h \ script/script_error.cpp \ script/script_error.h \ script/script_flags.h \ script/sigencoding.cpp \ script/sigencoding.h \ serialize.h \ tinyformat.h \ uint256.cpp \ uint256.h \ utilstrencodings.cpp \ utilstrencodings.h \ version.h # common: shared between bitcoind, and bitcoin-qt and non-server tools libbitcoin_common_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) libbitcoin_common_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_common_a_SOURCES = \ amount.cpp \ base58.cpp \ cashaddr.cpp \ cashaddrenc.cpp \ chainparams.cpp \ config.cpp \ coins.cpp \ compressor.cpp \ dstencode.cpp \ feerate.cpp \ globals.cpp \ core_read.cpp \ core_write.cpp \ key.cpp \ keystore.cpp \ netaddress.cpp \ netbase.cpp \ protocol.cpp \ scheduler.cpp \ script/sign.cpp \ script/standard.cpp \ warnings.cpp \ $(BITCOIN_CORE_H) # util: shared between all executables. # This library *must* be included to make sure that the glibc # backward-compatibility objects and their sanity checks are linked. libbitcoin_util_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) libbitcoin_util_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_util_a_SOURCES = \ support/lockedpool.cpp \ chainparamsbase.cpp \ clientversion.cpp \ compat/glibc_sanity.cpp \ compat/glibcxx_sanity.cpp \ compat/strnlen.cpp \ fs.cpp \ logging.cpp \ random.cpp \ rpc/protocol.cpp \ support/cleanse.cpp \ sync.cpp \ threadinterrupt.cpp \ uint256.cpp \ uint256.h \ util.cpp \ utilmoneystr.cpp \ utilstrencodings.cpp \ utiltime.cpp \ $(BITCOIN_CORE_H) if GLIBC_BACK_COMPAT libbitcoin_util_a_SOURCES += compat/glibc_compat.cpp endif # cli: shared between bitcoin-cli and bitcoin-qt libbitcoin_cli_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) libbitcoin_cli_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_cli_a_SOURCES = \ rpc/client.cpp \ $(BITCOIN_CORE_H) # seeder library libbitcoin_seeder_a_CPPFLAGS = $(AM_CPPFLAGS) $(PIE_FLAGS) $(BITCOIN_SEEDER_INCLUDES) libbitcoin_seeder_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) libbitcoin_seeder_a_SOURCES = \ seeder/bitcoin.cpp \ seeder/bitcoin.h \ seeder/compat.h \ seeder/db.cpp \ seeder/db.h \ seeder/dns.cpp \ seeder/dns.h \ seeder/strlcpy.h \ seeder/util.h nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h # # bitcoind binary # bitcoind_SOURCES = bitcoind.cpp bitcoind_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) bitcoind_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) bitcoind_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) if TARGET_WINDOWS bitcoind_SOURCES += bitcoind-res.rc endif bitcoind_LDADD = \ $(LIBBITCOIN_SERVER) \ $(LIBBITCOIN_COMMON) \ $(LIBUNIVALUE) \ $(LIBBITCOIN_UTIL) \ $(LIBBITCOIN_WALLET) \ $(LIBBITCOIN_ZMQ) \ $(LIBBITCOIN_CONSENSUS) \ $(LIBBITCOIN_CRYPTO) \ $(LIBLEVELDB) \ $(LIBLEVELDB_SSE42) \ $(LIBMEMENV) \ $(LIBSECP256K1) bitcoind_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(ZMQ_LIBS) # bitcoin-cli binary # bitcoin_cli_SOURCES = bitcoin-cli.cpp bitcoin_cli_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(EVENT_CFLAGS) bitcoin_cli_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) bitcoin_cli_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) if TARGET_WINDOWS bitcoin_cli_SOURCES += bitcoin-cli-res.rc endif bitcoin_cli_LDADD = \ $(LIBBITCOIN_CLI) \ $(LIBUNIVALUE) \ $(LIBBITCOIN_UTIL) \ $(LIBBITCOIN_CRYPTO) bitcoin_cli_LDADD += $(BOOST_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) $(EVENT_LIBS) # # bitcoin-seeder binary # bitcoin_seeder_SOURCES = seeder/main.cpp bitcoin_seeder_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_SEEDER_INCLUDES) bitcoin_seeder_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) bitcoin_seeder_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) bitcoin_seeder_LDADD = \ $(LIBBITCOIN_SEEDER) \ $(LIBBITCOIN_COMMON) \ $(LIBBITCOIN_UTIL) \ $(LIBBITCOIN_CRYPTO) bitcoin_seeder_LDADD += $(BOOST_LIBS) $(CRYPTO_LIBS) # # bitcoin-tx binary # bitcoin_tx_SOURCES = bitcoin-tx.cpp bitcoin_tx_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) bitcoin_tx_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) bitcoin_tx_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) if TARGET_WINDOWS bitcoin_tx_SOURCES += bitcoin-tx-res.rc endif bitcoin_tx_LDADD = \ $(LIBUNIVALUE) \ $(LIBBITCOIN_COMMON) \ $(LIBBITCOIN_UTIL) \ $(LIBBITCOIN_CONSENSUS) \ $(LIBBITCOIN_CRYPTO) \ $(LIBSECP256K1) bitcoin_tx_LDADD += $(BOOST_LIBS) $(CRYPTO_LIBS) # # bitcoinconsensus library # if BUILD_BITCOIN_LIBS include_HEADERS = script/bitcoinconsensus.h libbitcoinconsensus_la_SOURCES = $(crypto_libbitcoin_crypto_a_SOURCES) $(libbitcoin_consensus_a_SOURCES) if GLIBC_BACK_COMPAT libbitcoinconsensus_la_SOURCES += compat/glibc_compat.cpp endif libbitcoinconsensus_la_LDFLAGS = $(AM_LDFLAGS) -no-undefined $(RELDFLAGS) libbitcoinconsensus_la_LIBADD = $(LIBSECP256K1) libbitcoinconsensus_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(builddir)/obj -I$(srcdir)/secp256k1/include -DBUILD_BITCOIN_INTERNAL libbitcoinconsensus_la_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) endif # CTAES_DIST = crypto/ctaes/bench.c CTAES_DIST += crypto/ctaes/ctaes.c CTAES_DIST += crypto/ctaes/ctaes.h CTAES_DIST += crypto/ctaes/README.md CTAES_DIST += crypto/ctaes/test.c CLEANFILES = $(EXTRA_LIBRARIES) CLEANFILES += *.gcda *.gcno CLEANFILES += compat/*.gcda compat/*.gcno CLEANFILES += consensus/*.gcda consensus/*.gcno CLEANFILES += crypto/*.gcda crypto/*.gcno CLEANFILES += policy/*.gcda policy/*.gcno CLEANFILES += primitives/*.gcda primitives/*.gcno CLEANFILES += script/*.gcda script/*.gcno CLEANFILES += support/*.gcda support/*.gcno CLEANFILES += univalue/*.gcda univalue/*.gcno CLEANFILES += wallet/*.gcda wallet/*.gcno CLEANFILES += wallet/test/*.gcda wallet/test/*.gcno CLEANFILES += zmq/*.gcda zmq/*.gcno DISTCLEANFILES = obj/build.h EXTRA_DIST = $(CTAES_DIST) clean-local: -$(MAKE) -C secp256k1 clean -$(MAKE) -C univalue clean -rm -f leveldb/*/*.gcda leveldb/*/*.gcno leveldb/helpers/memenv/*.gcda leveldb/helpers/memenv/*.gcno -rm -rf test/__pycache__ .rc.o: @test -f $(WINDRES) ## FIXME: How to get the appropriate modulename_CPPFLAGS in here? $(AM_V_GEN) $(WINDRES) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CPPFLAGS) -DWINDRES_PREPROC -i $< -o $@ .mm.o: $(AM_V_CXX) $(OBJCXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \ $(CPPFLAGS) $(AM_CXXFLAGS) $(QT_INCLUDES) $(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) -c -o $@ $< check-symbols: $(bin_PROGRAMS) if GLIBC_BACK_COMPAT @echo "Checking glibc back compat..." $(AM_V_at) READELF=$(READELF) CPPFILT=$(CPPFILT) $(top_srcdir)/contrib/devtools/symbol-check.py < $(bin_PROGRAMS) endif check-security: $(bin_PROGRAMS) if HARDEN @echo "Checking binary security..." $(AM_V_at) READELF=$(READELF) OBJDUMP=$(OBJDUMP) $(top_srcdir)/contrib/devtools/security-check.py < $(bin_PROGRAMS) endif %.pb.cc %.pb.h: %.proto @test -f $(PROTOC) $(AM_V_GEN) $(PROTOC) --cpp_out=$(@D) --proto_path=$( + +enum class BlockValidity : uint32_t { + /** + * Unused. + */ + UNKNOWN = 0, + + /** + * Parsed, version ok, hash satisfies claimed PoW, 1 <= vtx count <= max, + * timestamp not in future. + */ + HEADER = 1, + + /** + * All parent headers found, difficulty matches, timestamp >= median + * previous, checkpoint. Implies all parents are also at least TREE. + */ + TREE = 2, + + /** + * Only first tx is coinbase, 2 <= coinbase input script length <= 100, + * transactions valid, no duplicate txids, sigops, size, merkle root. + * Implies all parents are at least TREE but not necessarily TRANSACTIONS. + * When all parent blocks also have TRANSACTIONS, CBlockIndex::nChainTx will + * be set. + */ + TRANSACTIONS = 3, + + /** + * Outputs do not overspend inputs, no double spends, coinbase output ok, no + * immature coinbase spends, BIP30. + * Implies all parents are also at least CHAIN. + */ + CHAIN = 4, + + /** + * Scripts & signatures ok. Implies all parents are also at least SCRIPTS. + */ + SCRIPTS = 5, +}; + +#endif // BITCOIN_BLOCKVALIDITY_H diff --git a/src/chain.h b/src/chain.h index 734b5ce6a..6947a1105 100644 --- a/src/chain.h +++ b/src/chain.h @@ -1,552 +1,513 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #ifndef BITCOIN_CHAIN_H #define BITCOIN_CHAIN_H #include "arith_uint256.h" +#include "blockvalidity.h" #include "consensus/params.h" #include "diskblockpos.h" #include "pow.h" #include "primitives/block.h" #include "tinyformat.h" #include "uint256.h" #include #include /** * Maximum amount of time that a block timestamp is allowed to exceed the * current network-adjusted time before the block will be accepted. */ static const int64_t MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60; /** * Timestamp window used as a grace period by code that compares external * timestamps (such as timestamps passed to RPCs, or wallet key creation times) * to block timestamps. This should be set at least as high as * MAX_FUTURE_BLOCK_TIME. */ static const int64_t TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME; -enum class BlockValidity : uint32_t { - /** - * Unused. - */ - UNKNOWN = 0, - - /** - * Parsed, version ok, hash satisfies claimed PoW, 1 <= vtx count <= max, - * timestamp not in future. - */ - HEADER = 1, - - /** - * All parent headers found, difficulty matches, timestamp >= median - * previous, checkpoint. Implies all parents are also at least TREE. - */ - TREE = 2, - - /** - * Only first tx is coinbase, 2 <= coinbase input script length <= 100, - * transactions valid, no duplicate txids, sigops, size, merkle root. - * Implies all parents are at least TREE but not necessarily TRANSACTIONS. - * When all parent blocks also have TRANSACTIONS, CBlockIndex::nChainTx will - * be set. - */ - TRANSACTIONS = 3, - - /** - * Outputs do not overspend inputs, no double spends, coinbase output ok, no - * immature coinbase spends, BIP30. - * Implies all parents are also at least CHAIN. - */ - CHAIN = 4, - - /** - * Scripts & signatures ok. Implies all parents are also at least SCRIPTS. - */ - SCRIPTS = 5, -}; - struct BlockStatus { private: uint32_t status; explicit BlockStatus(uint32_t nStatusIn) : status(nStatusIn) {} static const uint32_t VALIDITY_MASK = 0x07; // Full block available in blk*.dat static const uint32_t HAS_DATA_FLAG = 0x08; // Undo data available in rev*.dat static const uint32_t HAS_UNDO_FLAG = 0x10; // The block is invalid. static const uint32_t FAILED_FLAG = 0x20; // The block has an invalid parent. static const uint32_t FAILED_PARENT_FLAG = 0x40; // Mask used to check if the block failed. static const uint32_t INVALID_MASK = FAILED_FLAG | FAILED_PARENT_FLAG; // The block is being parked for some reason. It will be reconsidered if its // chains grows. static const uint32_t PARKED_FLAG = 0x80; // One of the block's parent is parked. static const uint32_t PARKED_PARENT_FLAG = 0x100; // Mask used to check for parked blocks. static const uint32_t PARKED_MASK = PARKED_FLAG | PARKED_PARENT_FLAG; public: explicit BlockStatus() : status(0) {} BlockValidity getValidity() const { return BlockValidity(status & VALIDITY_MASK); } BlockStatus withValidity(BlockValidity validity) const { return BlockStatus((status & ~VALIDITY_MASK) | uint32_t(validity)); } bool hasData() const { return status & HAS_DATA_FLAG; } BlockStatus withData(bool hasData = true) const { return BlockStatus((status & ~HAS_DATA_FLAG) | (hasData ? HAS_DATA_FLAG : 0)); } bool hasUndo() const { return status & HAS_UNDO_FLAG; } BlockStatus withUndo(bool hasUndo = true) const { return BlockStatus((status & ~HAS_UNDO_FLAG) | (hasUndo ? HAS_UNDO_FLAG : 0)); } bool hasFailed() const { return status & FAILED_FLAG; } BlockStatus withFailed(bool hasFailed = true) const { return BlockStatus((status & ~FAILED_FLAG) | (hasFailed ? FAILED_FLAG : 0)); } bool hasFailedParent() const { return status & FAILED_PARENT_FLAG; } BlockStatus withFailedParent(bool hasFailedParent = true) const { return BlockStatus((status & ~FAILED_PARENT_FLAG) | (hasFailedParent ? FAILED_PARENT_FLAG : 0)); } bool isParked() const { return status & PARKED_FLAG; } BlockStatus withParked(bool parked = true) const { return BlockStatus((status & ~PARKED_FLAG) | (parked ? PARKED_FLAG : 0)); } bool hasParkedParent() const { return status & PARKED_PARENT_FLAG; } BlockStatus withParkedParent(bool parkedParent = true) const { return BlockStatus((status & ~PARKED_PARENT_FLAG) | (parkedParent ? PARKED_PARENT_FLAG : 0)); } /** * Check whether this block index entry is valid up to the passed validity * level. */ bool isValid(enum BlockValidity nUpTo = BlockValidity::TRANSACTIONS) const { if (isInvalid()) { return false; } return getValidity() >= nUpTo; } bool isInvalid() const { return status & INVALID_MASK; } BlockStatus withClearedFailureFlags() const { return BlockStatus(status & ~INVALID_MASK); } bool isOnParkedChain() const { return status & PARKED_MASK; } ADD_SERIALIZE_METHODS; template inline void SerializationOp(Stream &s, Operation ser_action) { READWRITE(VARINT(status)); } }; /** * The block chain is a tree shaped structure starting with the genesis block at * the root, with each block potentially having multiple candidates to be the * next block. A blockindex may have multiple pprev pointing to it, but at most * one of them can be part of the currently active branch. */ class CBlockIndex { public: //! pointer to the hash of the block, if any. Memory is owned by this //! CBlockIndex const uint256 *phashBlock; //! pointer to the index of the predecessor of this block CBlockIndex *pprev; //! pointer to the index of some further predecessor of this block CBlockIndex *pskip; //! height of the entry in the chain. The genesis block has height 0 int nHeight; //! Which # file this block is stored in (blk?????.dat) int nFile; //! Byte offset within blk?????.dat where this block's data is stored unsigned int nDataPos; //! Byte offset within rev?????.dat where this block's undo data is stored unsigned int nUndoPos; //! (memory only) Total amount of work (expected number of hashes) in the //! chain up to and including this block arith_uint256 nChainWork; //! Number of transactions in this block. //! Note: in a potential headers-first mode, this number cannot be relied //! upon unsigned int nTx; //! (memory only) Number of transactions in the chain up to and including //! this block. //! This value will be non-zero only if and only if transactions for this //! block and all its parents are available. Change to 64-bit type when //! necessary; won't happen before 2030 unsigned int nChainTx; //! Verification status of this block. See enum BlockStatus BlockStatus nStatus; //! block header int32_t nVersion; uint256 hashMerkleRoot; uint32_t nTime; uint32_t nBits; uint32_t nNonce; //! (memory only) Sequential id assigned to distinguish order in which //! blocks are received. int32_t nSequenceId; //! (memory only) block header metadata uint64_t nTimeReceived; //! (memory only) Maximum nTime in the chain upto and including this block. unsigned int nTimeMax; void SetNull() { phashBlock = nullptr; pprev = nullptr; pskip = nullptr; nHeight = 0; nFile = 0; nDataPos = 0; nUndoPos = 0; nChainWork = arith_uint256(); nTx = 0; nChainTx = 0; nStatus = BlockStatus(); nSequenceId = 0; nTimeMax = 0; nVersion = 0; hashMerkleRoot = uint256(); nTime = 0; nTimeReceived = 0; nBits = 0; nNonce = 0; } CBlockIndex() { SetNull(); } CBlockIndex(const CBlockHeader &block) { SetNull(); nVersion = block.nVersion; hashMerkleRoot = block.hashMerkleRoot; nTime = block.nTime; // Default to block time if nTimeReceived is never set, which // in effect assumes that this block is honestly mined. // Note that nTimeReceived isn't written to disk, so blocks read from // disk will be assumed to be honestly mined. nTimeReceived = block.nTime; nBits = block.nBits; nNonce = block.nNonce; } CDiskBlockPos GetBlockPos() const { CDiskBlockPos ret; if (nStatus.hasData()) { ret.nFile = nFile; ret.nPos = nDataPos; } return ret; } CDiskBlockPos GetUndoPos() const { CDiskBlockPos ret; if (nStatus.hasUndo()) { ret.nFile = nFile; ret.nPos = nUndoPos; } return ret; } CBlockHeader GetBlockHeader() const { CBlockHeader block; block.nVersion = nVersion; if (pprev) { block.hashPrevBlock = pprev->GetBlockHash(); } block.hashMerkleRoot = hashMerkleRoot; block.nTime = nTime; block.nBits = nBits; block.nNonce = nNonce; return block; } uint256 GetBlockHash() const { return *phashBlock; } int64_t GetBlockTime() const { return int64_t(nTime); } int64_t GetBlockTimeMax() const { return int64_t(nTimeMax); } int64_t GetHeaderReceivedTime() const { return nTimeReceived; } int64_t GetReceivedTimeDiff() const { return GetHeaderReceivedTime() - GetBlockTime(); } enum { nMedianTimeSpan = 11 }; int64_t GetMedianTimePast() const { int64_t pmedian[nMedianTimeSpan]; int64_t *pbegin = &pmedian[nMedianTimeSpan]; int64_t *pend = &pmedian[nMedianTimeSpan]; const CBlockIndex *pindex = this; for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev) { *(--pbegin) = pindex->GetBlockTime(); } std::sort(pbegin, pend); return pbegin[(pend - pbegin) / 2]; } std::string ToString() const { return strprintf( "CBlockIndex(pprev=%p, nHeight=%d, merkle=%s, hashBlock=%s)", pprev, nHeight, hashMerkleRoot.ToString(), GetBlockHash().ToString()); } //! Check whether this block index entry is valid up to the passed validity //! level. bool IsValid(enum BlockValidity nUpTo = BlockValidity::TRANSACTIONS) const { return nStatus.isValid(nUpTo); } //! Raise the validity level of this block index entry. //! Returns true if the validity was changed. bool RaiseValidity(enum BlockValidity nUpTo) { // Only validity flags allowed. if (nStatus.isInvalid()) { return false; } if (nStatus.getValidity() >= nUpTo) { return false; } nStatus = nStatus.withValidity(nUpTo); return true; } //! Build the skiplist pointer for this entry. void BuildSkip(); //! Efficiently find an ancestor of this block. CBlockIndex *GetAncestor(int height); const CBlockIndex *GetAncestor(int height) const; }; /** * Maintain a map of CBlockIndex for all known headers. */ struct BlockHasher { size_t operator()(const uint256 &hash) const { return hash.GetCheapHash(); } }; typedef std::unordered_map BlockMap; extern BlockMap mapBlockIndex; arith_uint256 GetBlockProof(const CBlockIndex &block); /** * Return the time it would take to redo the work difference between from and * to, assuming the current hashrate corresponds to the difficulty at tip, in * seconds. */ int64_t GetBlockProofEquivalentTime(const CBlockIndex &to, const CBlockIndex &from, const CBlockIndex &tip, const Consensus::Params &); /** * Find the forking point between two chain tips. */ const CBlockIndex *LastCommonAncestor(const CBlockIndex *pa, const CBlockIndex *pb); /** Used to marshal pointers into hashes for db storage. */ class CDiskBlockIndex : public CBlockIndex { public: uint256 hashPrev; CDiskBlockIndex() { hashPrev = uint256(); } explicit CDiskBlockIndex(const CBlockIndex *pindex) : CBlockIndex(*pindex) { hashPrev = (pprev ? pprev->GetBlockHash() : uint256()); } ADD_SERIALIZE_METHODS; template inline void SerializationOp(Stream &s, Operation ser_action) { int nVersion = s.GetVersion(); if (!(s.GetType() & SER_GETHASH)) { READWRITE(VARINT(nVersion)); } READWRITE(VARINT(nHeight)); READWRITE(nStatus); READWRITE(VARINT(nTx)); if (nStatus.hasData() || nStatus.hasUndo()) { READWRITE(VARINT(nFile)); } if (nStatus.hasData()) { READWRITE(VARINT(nDataPos)); } if (nStatus.hasUndo()) { READWRITE(VARINT(nUndoPos)); } // block header READWRITE(this->nVersion); READWRITE(hashPrev); READWRITE(hashMerkleRoot); READWRITE(nTime); READWRITE(nBits); READWRITE(nNonce); } uint256 GetBlockHash() const { CBlockHeader block; block.nVersion = nVersion; block.hashPrevBlock = hashPrev; block.hashMerkleRoot = hashMerkleRoot; block.nTime = nTime; block.nBits = nBits; block.nNonce = nNonce; return block.GetHash(); } std::string ToString() const { std::string str = "CDiskBlockIndex("; str += CBlockIndex::ToString(); str += strprintf("\n hashBlock=%s, hashPrev=%s)", GetBlockHash().ToString(), hashPrev.ToString()); return str; } }; /** * An in-memory indexed chain of blocks. */ class CChain { private: std::vector vChain; public: /** * Returns the index entry for the genesis block of this chain, or nullptr * if none. */ CBlockIndex *Genesis() const { return vChain.size() > 0 ? vChain[0] : nullptr; } /** * Returns the index entry for the tip of this chain, or nullptr if none. */ CBlockIndex *Tip() const { return vChain.size() > 0 ? vChain[vChain.size() - 1] : nullptr; } /** * Returns the index entry at a particular height in this chain, or nullptr * if no such height exists. */ CBlockIndex *operator[](int nHeight) const { if (nHeight < 0 || nHeight >= (int)vChain.size()) { return nullptr; } return vChain[nHeight]; } /** Compare two chains efficiently. */ friend bool operator==(const CChain &a, const CChain &b) { return a.vChain.size() == b.vChain.size() && a.vChain[a.vChain.size() - 1] == b.vChain[b.vChain.size() - 1]; } /** Efficiently check whether a block is present in this chain. */ bool Contains(const CBlockIndex *pindex) const { return (*this)[pindex->nHeight] == pindex; } /** * Find the successor of a block in this chain, or nullptr if the given * index is not found or is the tip. */ CBlockIndex *Next(const CBlockIndex *pindex) const { if (!Contains(pindex)) { return nullptr; } return (*this)[pindex->nHeight + 1]; } /** * Return the maximal height in the chain. Is equal to chain.Tip() ? * chain.Tip()->nHeight : -1. */ int Height() const { return vChain.size() - 1; } /** Set/initialize a chain with a given tip. */ void SetTip(CBlockIndex *pindex); /** * Return a CBlockLocator that refers to a block in this chain (by default * the tip). */ CBlockLocator GetLocator(const CBlockIndex *pindex = nullptr) const; /** * Find the last common block between this chain and a block index entry. */ const CBlockIndex *FindFork(const CBlockIndex *pindex) const; /** * Find the earliest block with timestamp equal or greater than the given. */ CBlockIndex *FindEarliestAtLeast(int64_t nTime) const; }; #endif // BITCOIN_CHAIN_H diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 20b9bd09b..d7a61fc6c 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -1,3802 +1,3803 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include "net_processing.h" #include "addrman.h" #include "arith_uint256.h" #include "blockencodings.h" +#include "blockvalidity.h" #include "chainparams.h" #include "config.h" #include "consensus/validation.h" #include "hash.h" #include "init.h" #include "merkleblock.h" #include "net.h" #include "netbase.h" #include "netmessagemaker.h" #include "policy/fees.h" #include "policy/policy.h" #include "primitives/block.h" #include "primitives/transaction.h" #include "random.h" #include "tinyformat.h" #include "txmempool.h" #include "ui_interface.h" #include "util.h" #include "utilmoneystr.h" #include "utilstrencodings.h" #include "validation.h" #include "validationinterface.h" #include #include #if defined(NDEBUG) #error "Bitcoin cannot be compiled without assertions." #endif // Used only to inform the wallet of when we last received a block. std::atomic nTimeBestReceived(0); struct IteratorComparator { template bool operator()(const I &a, const I &b) { return &(*a) < &(*b); } }; struct COrphanTx { // When modifying, adapt the copy of this definition in tests/DoS_tests. CTransactionRef tx; NodeId fromPeer; int64_t nTimeExpire; }; std::map mapOrphanTransactions GUARDED_BY(cs_main); std::map::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(cs_main); void EraseOrphansFor(NodeId peer) EXCLUSIVE_LOCKS_REQUIRED(cs_main); static size_t vExtraTxnForCompactIt = 0; static std::vector> vExtraTxnForCompact GUARDED_BY(cs_main); // SHA256("main address relay")[0:8] static const uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL; // Internal stuff namespace { /** Number of nodes with fSyncStarted. */ int nSyncStarted = 0; /** * Sources of received blocks, saved to be able to send them reject messages or * ban them when processing happens afterwards. Protected by cs_main. * Set mapBlockSource[hash].second to false if the node should not be punished * if the block is invalid. */ std::map> mapBlockSource; /** * Filter for transactions that were recently rejected by AcceptToMemoryPool. * These are not rerequested until the chain tip changes, at which point the * entire filter is reset. Protected by cs_main. * * Without this filter we'd be re-requesting txs from each of our peers, * increasing bandwidth consumption considerably. For instance, with 100 peers, * half of which relay a tx we don't accept, that might be a 50x bandwidth * increase. A flooding attacker attempting to roll-over the filter using * minimum-sized, 60byte, transactions might manage to send 1000/sec if we have * fast peers, so we pick 120,000 to give our peers a two minute window to send * invs to us. * * Decreasing the false positive rate is fairly cheap, so we pick one in a * million to make it highly unlikely for users to have issues with this filter. * * Memory used: 1.3 MB */ std::unique_ptr recentRejects; uint256 hashRecentRejectsChainTip; /** * Blocks that are in flight, and that are in the queue to be downloaded. * Protected by cs_main. */ struct QueuedBlock { uint256 hash; //!< Optional. const CBlockIndex *pindex; //!< Whether this block has validated headers at the time of request. bool fValidatedHeaders; //!< Optional, used for CMPCTBLOCK downloads std::unique_ptr partialBlock; }; std::map::iterator>> mapBlocksInFlight; /** Stack of nodes which we have set to announce using compact blocks */ std::list lNodesAnnouncingHeaderAndIDs; /** Number of preferable block download peers. */ int nPreferredDownload = 0; /** Number of peers from which we're downloading blocks. */ int nPeersWithValidatedDownloads = 0; /** Relay map, protected by cs_main. */ typedef std::map MapRelay; MapRelay mapRelay; /** Expiration-time ordered list of (expire time, relay map entry) pairs, * protected by cs_main). */ std::deque> vRelayExpiration; } // namespace ////////////////////////////////////////////////////////////////////////////// // // Registration of network node signals. // namespace { struct CBlockReject { uint8_t chRejectCode; std::string strRejectReason; uint256 hashBlock; }; /** * Maintain validation-specific state about nodes, protected by cs_main, instead * by CNode's own locks. This simplifies asynchronous operation, where * processing of incoming data is done after the ProcessMessage call returns, * and we're no longer holding the node's locks. */ struct CNodeState { //! The peer's address const CService address; //! Whether we have a fully established connection. bool fCurrentlyConnected; //! Accumulated misbehaviour score for this peer. int nMisbehavior; //! Whether this peer should be disconnected and banned (unless //! whitelisted). bool fShouldBan; //! String name of this peer (debugging/logging purposes). const std::string name; //! List of asynchronously-determined block rejections to notify this peer //! about. std::vector rejects; //! The best known block we know this peer has announced. const CBlockIndex *pindexBestKnownBlock; //! The hash of the last unknown block this peer has announced. uint256 hashLastUnknownBlock; //! The last full block we both have. const CBlockIndex *pindexLastCommonBlock; //! The best header we have sent our peer. const CBlockIndex *pindexBestHeaderSent; //! Length of current-streak of unconnecting headers announcements int nUnconnectingHeaders; //! Whether we've started headers synchronization with this peer. bool fSyncStarted; //! Since when we're stalling block download progress (in microseconds), or //! 0. int64_t nStallingSince; std::list vBlocksInFlight; //! When the first entry in vBlocksInFlight started downloading. Don't care //! when vBlocksInFlight is empty. int64_t nDownloadingSince; int nBlocksInFlight; int nBlocksInFlightValidHeaders; //! Whether we consider this a preferred download peer. bool fPreferredDownload; //! Whether this peer wants invs or headers (when possible) for block //! announcements. bool fPreferHeaders; //! Whether this peer wants invs or cmpctblocks (when possible) for block //! announcements. bool fPreferHeaderAndIDs; /** * Whether this peer will send us cmpctblocks if we request them. * This is not used to gate request logic, as we really only care about * fSupportsDesiredCmpctVersion, but is used as a flag to "lock in" the * version of compact blocks we send. */ bool fProvidesHeaderAndIDs; /** * If we've announced NODE_WITNESS to this peer: whether the peer sends * witnesses in cmpctblocks/blocktxns, otherwise: whether this peer sends * non-witnesses in cmpctblocks/blocktxns. */ bool fSupportsDesiredCmpctVersion; CNodeState(CAddress addrIn, std::string addrNameIn) : address(addrIn), name(addrNameIn) { fCurrentlyConnected = false; nMisbehavior = 0; fShouldBan = false; pindexBestKnownBlock = nullptr; hashLastUnknownBlock.SetNull(); pindexLastCommonBlock = nullptr; pindexBestHeaderSent = nullptr; nUnconnectingHeaders = 0; fSyncStarted = false; nStallingSince = 0; nDownloadingSince = 0; nBlocksInFlight = 0; nBlocksInFlightValidHeaders = 0; fPreferredDownload = false; fPreferHeaders = false; fPreferHeaderAndIDs = false; fProvidesHeaderAndIDs = false; fSupportsDesiredCmpctVersion = false; } }; /** Map maintaining per-node state. Requires cs_main. */ std::map mapNodeState; // Requires cs_main. CNodeState *State(NodeId pnode) { std::map::iterator it = mapNodeState.find(pnode); if (it == mapNodeState.end()) { return nullptr; } return &it->second; } void UpdatePreferredDownload(CNode *node, CNodeState *state) { nPreferredDownload -= state->fPreferredDownload; // Whether this node should be marked as a preferred download node. state->fPreferredDownload = (!node->fInbound || node->fWhitelisted) && !node->fOneShot && !node->fClient; nPreferredDownload += state->fPreferredDownload; } void PushNodeVersion(const Config &config, CNode *pnode, CConnman &connman, int64_t nTime) { ServiceFlags nLocalNodeServices = pnode->GetLocalServices(); uint64_t nonce = pnode->GetLocalNonce(); int nNodeStartingHeight = pnode->GetMyStartingHeight(); NodeId nodeid = pnode->GetId(); CAddress addr = pnode->addr; CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService(), addr.nServices)); CAddress addrMe = CAddress(CService(), nLocalNodeServices); connman.PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe, nonce, userAgent(config), nNodeStartingHeight, ::fRelayTxes)); if (fLogIPs) { LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, " "us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), addrYou.ToString(), nodeid); } else { LogPrint( BCLog::NET, "send version message: version %d, blocks=%d, us=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), nodeid); } } void InitializeNode(const Config &config, CNode *pnode, CConnman &connman) { CAddress addr = pnode->addr; std::string addrName = pnode->GetAddrName(); NodeId nodeid = pnode->GetId(); { LOCK(cs_main); mapNodeState.emplace_hint( mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName))); } if (!pnode->fInbound) { PushNodeVersion(config, pnode, connman, GetTime()); } } void FinalizeNode(NodeId nodeid, bool &fUpdateConnectionTime) { fUpdateConnectionTime = false; LOCK(cs_main); CNodeState *state = State(nodeid); if (state->fSyncStarted) { nSyncStarted--; } if (state->nMisbehavior == 0 && state->fCurrentlyConnected) { fUpdateConnectionTime = true; } for (const QueuedBlock &entry : state->vBlocksInFlight) { mapBlocksInFlight.erase(entry.hash); } // Get rid of stale mapBlockSource entries for this peer as they may leak // if we don't clean them up (I saw on the order of ~100 stale entries on // a full resynch in my testing -- these entries stay forever). // Performance note: most of the time mapBlockSource has 0 or 1 entries. // During synch of blockchain it may end up with as many as 1000 entries, // which still only takes ~1ms to iterate through on even old hardware. // So this memleak cleanup is not expensive and worth doing since even // small leaks are bad. :) for (auto it = mapBlockSource.begin(); it != mapBlockSource.end(); /*NA*/) { if (it->second.first == nodeid) { mapBlockSource.erase(it++); } else { ++it; } } EraseOrphansFor(nodeid); nPreferredDownload -= state->fPreferredDownload; nPeersWithValidatedDownloads -= (state->nBlocksInFlightValidHeaders != 0); assert(nPeersWithValidatedDownloads >= 0); mapNodeState.erase(nodeid); if (mapNodeState.empty()) { // Do a consistency check after the last peer is removed. assert(mapBlocksInFlight.empty()); assert(nPreferredDownload == 0); assert(nPeersWithValidatedDownloads == 0); } } // Requires cs_main. // Returns a bool indicating whether we requested this block. // Also used if a block was /not/ received and timed out or started with another // peer. bool MarkBlockAsReceived(const uint256 &hash) { std::map::iterator>>::iterator itInFlight = mapBlocksInFlight.find(hash); if (itInFlight != mapBlocksInFlight.end()) { CNodeState *state = State(itInFlight->second.first); state->nBlocksInFlightValidHeaders -= itInFlight->second.second->fValidatedHeaders; if (state->nBlocksInFlightValidHeaders == 0 && itInFlight->second.second->fValidatedHeaders) { // Last validated block on the queue was received. nPeersWithValidatedDownloads--; } if (state->vBlocksInFlight.begin() == itInFlight->second.second) { // First block on the queue was received, update the start download // time for the next one state->nDownloadingSince = std::max(state->nDownloadingSince, GetTimeMicros()); } state->vBlocksInFlight.erase(itInFlight->second.second); state->nBlocksInFlight--; state->nStallingSince = 0; mapBlocksInFlight.erase(itInFlight); return true; } return false; } // Requires cs_main. // returns false, still setting pit, if the block was already in flight from the // same peer pit will only be valid as long as the same cs_main lock is being // held. static bool MarkBlockAsInFlight(const Config &config, NodeId nodeid, const uint256 &hash, const Consensus::Params &consensusParams, const CBlockIndex *pindex = nullptr, std::list::iterator **pit = nullptr) { CNodeState *state = State(nodeid); assert(state != nullptr); // Short-circuit most stuff in case its from the same node. std::map::iterator>>::iterator itInFlight = mapBlocksInFlight.find(hash); if (itInFlight != mapBlocksInFlight.end() && itInFlight->second.first == nodeid) { *pit = &itInFlight->second.second; return false; } // Make sure it's not listed somewhere already. MarkBlockAsReceived(hash); std::list::iterator it = state->vBlocksInFlight.insert( state->vBlocksInFlight.end(), {hash, pindex, pindex != nullptr, std::unique_ptr( pit ? new PartiallyDownloadedBlock(config, &mempool) : nullptr)}); state->nBlocksInFlight++; state->nBlocksInFlightValidHeaders += it->fValidatedHeaders; if (state->nBlocksInFlight == 1) { // We're starting a block download (batch) from this peer. state->nDownloadingSince = GetTimeMicros(); } if (state->nBlocksInFlightValidHeaders == 1 && pindex != nullptr) { nPeersWithValidatedDownloads++; } itInFlight = mapBlocksInFlight .insert(std::make_pair(hash, std::make_pair(nodeid, it))) .first; if (pit) { *pit = &itInFlight->second.second; } return true; } /** Check whether the last unknown block a peer advertised is not yet known. */ void ProcessBlockAvailability(NodeId nodeid) { CNodeState *state = State(nodeid); assert(state != nullptr); if (!state->hashLastUnknownBlock.IsNull()) { BlockMap::iterator itOld = mapBlockIndex.find(state->hashLastUnknownBlock); if (itOld != mapBlockIndex.end() && itOld->second->nChainWork > 0) { if (state->pindexBestKnownBlock == nullptr || itOld->second->nChainWork >= state->pindexBestKnownBlock->nChainWork) { state->pindexBestKnownBlock = itOld->second; } state->hashLastUnknownBlock.SetNull(); } } } /** Update tracking information about which blocks a peer is assumed to have. */ void UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) { CNodeState *state = State(nodeid); assert(state != nullptr); ProcessBlockAvailability(nodeid); BlockMap::iterator it = mapBlockIndex.find(hash); if (it != mapBlockIndex.end() && it->second->nChainWork > 0) { // An actually better block was announced. if (state->pindexBestKnownBlock == nullptr || it->second->nChainWork >= state->pindexBestKnownBlock->nChainWork) { state->pindexBestKnownBlock = it->second; } } else { // An unknown block was announced; just assume that the latest one is // the best one. state->hashLastUnknownBlock = hash; } } void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman &connman) { AssertLockHeld(cs_main); CNodeState *nodestate = State(nodeid); if (!nodestate) { LogPrint(BCLog::NET, "node state unavailable: peer=%d\n", nodeid); return; } if (!nodestate->fProvidesHeaderAndIDs) { return; } for (std::list::iterator it = lNodesAnnouncingHeaderAndIDs.begin(); it != lNodesAnnouncingHeaderAndIDs.end(); it++) { if (*it == nodeid) { lNodesAnnouncingHeaderAndIDs.erase(it); lNodesAnnouncingHeaderAndIDs.push_back(nodeid); return; } } connman.ForNode(nodeid, [&connman](CNode *pfrom) { bool fAnnounceUsingCMPCTBLOCK = false; uint64_t nCMPCTBLOCKVersion = 1; if (lNodesAnnouncingHeaderAndIDs.size() >= 3) { // As per BIP152, we only get 3 of our peers to announce // blocks using compact encodings. connman.ForNode(lNodesAnnouncingHeaderAndIDs.front(), [&connman, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion](CNode *pnodeStop) { connman.PushMessage( pnodeStop, CNetMsgMaker(pnodeStop->GetSendVersion()) .Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); return true; }); lNodesAnnouncingHeaderAndIDs.pop_front(); } fAnnounceUsingCMPCTBLOCK = true; connman.PushMessage(pfrom, CNetMsgMaker(pfrom->GetSendVersion()) .Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId()); return true; }); } // Requires cs_main bool CanDirectFetch(const Consensus::Params &consensusParams) { return chainActive.Tip()->GetBlockTime() > GetAdjustedTime() - consensusParams.nPowTargetSpacing * 20; } // Requires cs_main bool PeerHasHeader(CNodeState *state, const CBlockIndex *pindex) { if (state->pindexBestKnownBlock && pindex == state->pindexBestKnownBlock->GetAncestor(pindex->nHeight)) { return true; } if (state->pindexBestHeaderSent && pindex == state->pindexBestHeaderSent->GetAncestor(pindex->nHeight)) { return true; } return false; } /** * Update pindexLastCommonBlock and add not-in-flight missing successors to * vBlocks, until it has at most count entries. */ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector &vBlocks, NodeId &nodeStaller, const Consensus::Params &consensusParams) { if (count == 0) { return; } vBlocks.reserve(vBlocks.size() + count); CNodeState *state = State(nodeid); assert(state != nullptr); // Make sure pindexBestKnownBlock is up to date, we'll need it. ProcessBlockAvailability(nodeid); if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->nChainWork < chainActive.Tip()->nChainWork || state->pindexBestKnownBlock->nChainWork < nMinimumChainWork) { // This peer has nothing interesting. return; } if (state->pindexLastCommonBlock == nullptr) { // Bootstrap quickly by guessing a parent of our best tip is the forking // point. Guessing wrong in either direction is not a problem. state->pindexLastCommonBlock = chainActive[std::min( state->pindexBestKnownBlock->nHeight, chainActive.Height())]; } // If the peer reorganized, our previous pindexLastCommonBlock may not be an // ancestor of its current tip anymore. Go back enough to fix that. state->pindexLastCommonBlock = LastCommonAncestor( state->pindexLastCommonBlock, state->pindexBestKnownBlock); if (state->pindexLastCommonBlock == state->pindexBestKnownBlock) { return; } std::vector vToFetch; const CBlockIndex *pindexWalk = state->pindexLastCommonBlock; // Never fetch further than the best block we know the peer has, or more // than BLOCK_DOWNLOAD_WINDOW + 1 beyond the last linked block we have in // common with this peer. The +1 is so we can detect stalling, namely if we // would be able to download that next block if the window were 1 larger. int nWindowEnd = state->pindexLastCommonBlock->nHeight + BLOCK_DOWNLOAD_WINDOW; int nMaxHeight = std::min(state->pindexBestKnownBlock->nHeight, nWindowEnd + 1); NodeId waitingfor = -1; while (pindexWalk->nHeight < nMaxHeight) { // Read up to 128 (or more, if more blocks than that are needed) // successors of pindexWalk (towards pindexBestKnownBlock) into // vToFetch. We fetch 128, because CBlockIndex::GetAncestor may be as // expensive as iterating over ~100 CBlockIndex* entries anyway. int nToFetch = std::min(nMaxHeight - pindexWalk->nHeight, std::max(count - vBlocks.size(), 128)); vToFetch.resize(nToFetch); pindexWalk = state->pindexBestKnownBlock->GetAncestor( pindexWalk->nHeight + nToFetch); vToFetch[nToFetch - 1] = pindexWalk; for (unsigned int i = nToFetch - 1; i > 0; i--) { vToFetch[i - 1] = vToFetch[i]->pprev; } // Iterate over those blocks in vToFetch (in forward direction), adding // the ones that are not yet downloaded and not in flight to vBlocks. In // the mean time, update pindexLastCommonBlock as long as all ancestors // are already downloaded, or if it's already part of our chain (and // therefore don't need it even if pruned). for (const CBlockIndex *pindex : vToFetch) { if (!pindex->IsValid(BlockValidity::TREE)) { // We consider the chain that this peer is on invalid. return; } if (pindex->nStatus.hasData() || chainActive.Contains(pindex)) { if (pindex->nChainTx) { state->pindexLastCommonBlock = pindex; } } else if (mapBlocksInFlight.count(pindex->GetBlockHash()) == 0) { // The block is not already downloaded, and not yet in flight. if (pindex->nHeight > nWindowEnd) { // We reached the end of the window. if (vBlocks.size() == 0 && waitingfor != nodeid) { // We aren't able to fetch anything, but we would be if // the download window was one larger. nodeStaller = waitingfor; } return; } vBlocks.push_back(pindex); if (vBlocks.size() == count) { return; } } else if (waitingfor == -1) { // This is the first already-in-flight block. waitingfor = mapBlocksInFlight[pindex->GetBlockHash()].first; } } } } } // namespace bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats) { LOCK(cs_main); CNodeState *state = State(nodeid); if (state == nullptr) { return false; } stats.nMisbehavior = state->nMisbehavior; stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1; stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1; for (const QueuedBlock &queue : state->vBlocksInFlight) { if (queue.pindex) { stats.vHeightInFlight.push_back(queue.pindex->nHeight); } } return true; } void RegisterNodeSignals(CNodeSignals &nodeSignals) { nodeSignals.ProcessMessages.connect(&ProcessMessages); nodeSignals.SendMessages.connect(&SendMessages); nodeSignals.InitializeNode.connect(&InitializeNode); nodeSignals.FinalizeNode.connect(&FinalizeNode); } void UnregisterNodeSignals(CNodeSignals &nodeSignals) { nodeSignals.ProcessMessages.disconnect(&ProcessMessages); nodeSignals.SendMessages.disconnect(&SendMessages); nodeSignals.InitializeNode.disconnect(&InitializeNode); nodeSignals.FinalizeNode.disconnect(&FinalizeNode); } ////////////////////////////////////////////////////////////////////////////// // // mapOrphanTransactions // void AddToCompactExtraTransactions(const CTransactionRef &tx) { size_t max_extra_txn = gArgs.GetArg("-blockreconstructionextratxn", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN); if (max_extra_txn <= 0) { return; } if (!vExtraTxnForCompact.size()) { vExtraTxnForCompact.resize(max_extra_txn); } vExtraTxnForCompact[vExtraTxnForCompactIt] = std::make_pair(tx->GetId(), tx); vExtraTxnForCompactIt = (vExtraTxnForCompactIt + 1) % max_extra_txn; } bool AddOrphanTx(const CTransactionRef &tx, NodeId peer) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { const uint256 &txid = tx->GetId(); if (mapOrphanTransactions.count(txid)) { return false; } // Ignore big transactions, to avoid a send-big-orphans memory exhaustion // attack. If a peer has a legitimate large transaction with a missing // parent then we assume it will rebroadcast it later, after the parent // transaction(s) have been mined or received. // 100 orphans, each of which is at most 99,999 bytes big is at most 10 // megabytes of orphans and somewhat more byprev index (in the worst case): unsigned int sz = tx->GetTotalSize(); if (sz >= MAX_STANDARD_TX_SIZE) { LogPrint(BCLog::MEMPOOL, "ignoring large orphan tx (size: %u, hash: %s)\n", sz, txid.ToString()); return false; } auto ret = mapOrphanTransactions.emplace( txid, COrphanTx{tx, peer, GetTime() + ORPHAN_TX_EXPIRE_TIME}); assert(ret.second); for (const CTxIn &txin : tx->vin) { mapOrphanTransactionsByPrev[txin.prevout].insert(ret.first); } AddToCompactExtraTransactions(tx); LogPrint(BCLog::MEMPOOL, "stored orphan tx %s (mapsz %u outsz %u)\n", txid.ToString(), mapOrphanTransactions.size(), mapOrphanTransactionsByPrev.size()); return true; } static int EraseOrphanTx(uint256 hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { std::map::iterator it = mapOrphanTransactions.find(hash); if (it == mapOrphanTransactions.end()) { return 0; } for (const CTxIn &txin : it->second.tx->vin) { auto itPrev = mapOrphanTransactionsByPrev.find(txin.prevout); if (itPrev == mapOrphanTransactionsByPrev.end()) { continue; } itPrev->second.erase(it); if (itPrev->second.empty()) { mapOrphanTransactionsByPrev.erase(itPrev); } } mapOrphanTransactions.erase(it); return 1; } void EraseOrphansFor(NodeId peer) { int nErased = 0; std::map::iterator iter = mapOrphanTransactions.begin(); while (iter != mapOrphanTransactions.end()) { // Increment to avoid iterator becoming invalid. std::map::iterator maybeErase = iter++; if (maybeErase->second.fromPeer == peer) { nErased += EraseOrphanTx(maybeErase->second.tx->GetId()); } } if (nErased > 0) { LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx from peer=%d\n", nErased, peer); } } unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { unsigned int nEvicted = 0; static int64_t nNextSweep; int64_t nNow = GetTime(); if (nNextSweep <= nNow) { // Sweep out expired orphan pool entries: int nErased = 0; int64_t nMinExpTime = nNow + ORPHAN_TX_EXPIRE_TIME - ORPHAN_TX_EXPIRE_INTERVAL; std::map::iterator iter = mapOrphanTransactions.begin(); while (iter != mapOrphanTransactions.end()) { std::map::iterator maybeErase = iter++; if (maybeErase->second.nTimeExpire <= nNow) { nErased += EraseOrphanTx(maybeErase->second.tx->GetId()); } else { nMinExpTime = std::min(maybeErase->second.nTimeExpire, nMinExpTime); } } // Sweep again 5 minutes after the next entry that expires in order to // batch the linear scan. nNextSweep = nMinExpTime + ORPHAN_TX_EXPIRE_INTERVAL; if (nErased > 0) { LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx due to expiration\n", nErased); } } while (mapOrphanTransactions.size() > nMaxOrphans) { // Evict a random orphan: uint256 randomhash = GetRandHash(); std::map::iterator it = mapOrphanTransactions.lower_bound(randomhash); if (it == mapOrphanTransactions.end()) { it = mapOrphanTransactions.begin(); } EraseOrphanTx(it->first); ++nEvicted; } return nEvicted; } // Requires cs_main. void Misbehaving(NodeId pnode, int howmuch, const std::string &reason) { if (howmuch == 0) { return; } CNodeState *state = State(pnode); if (state == nullptr) { return; } state->nMisbehavior += howmuch; int banscore = gArgs.GetArg("-banscore", DEFAULT_BANSCORE_THRESHOLD); if (state->nMisbehavior >= banscore && state->nMisbehavior - howmuch < banscore) { LogPrintf( "%s: %s peer=%d (%d -> %d) reason: %s BAN THRESHOLD EXCEEDED\n", __func__, state->name, pnode, state->nMisbehavior - howmuch, state->nMisbehavior, reason.c_str()); state->fShouldBan = true; } else { LogPrintf("%s: %s peer=%d (%d -> %d) reason: %s\n", __func__, state->name, pnode, state->nMisbehavior - howmuch, state->nMisbehavior, reason.c_str()); } } // overloaded variant of above to operate on CNode*s static void Misbehaving(CNode *node, int howmuch, const std::string &reason) { Misbehaving(node->GetId(), howmuch, reason); } ////////////////////////////////////////////////////////////////////////////// // // blockchain -> download logic notification // PeerLogicValidation::PeerLogicValidation(CConnman *connmanIn) : connman(connmanIn) { // Initialize global variables that cannot be constructed at startup. recentRejects.reset(new CRollingBloomFilter(120000, 0.000001)); } void PeerLogicValidation::BlockConnected( const std::shared_ptr &pblock, const CBlockIndex *pindex, const std::vector &vtxConflicted) { LOCK(cs_main); std::vector vOrphanErase; for (const CTransactionRef &ptx : pblock->vtx) { const CTransaction &tx = *ptx; // Which orphan pool entries must we evict? for (size_t j = 0; j < tx.vin.size(); j++) { auto itByPrev = mapOrphanTransactionsByPrev.find(tx.vin[j].prevout); if (itByPrev == mapOrphanTransactionsByPrev.end()) { continue; } for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) { const CTransaction &orphanTx = *(*mi)->second.tx; const uint256 &orphanHash = orphanTx.GetHash(); vOrphanErase.push_back(orphanHash); } } } // Erase orphan transactions include or precluded by this block if (vOrphanErase.size()) { int nErased = 0; for (uint256 &orphanId : vOrphanErase) { nErased += EraseOrphanTx(orphanId); } LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx included or conflicted by block\n", nErased); } } static CCriticalSection cs_most_recent_block; static std::shared_ptr most_recent_block; static std::shared_ptr most_recent_compact_block; static uint256 most_recent_block_hash; void PeerLogicValidation::NewPoWValidBlock( const CBlockIndex *pindex, const std::shared_ptr &pblock) { std::shared_ptr pcmpctblock = std::make_shared(*pblock); const CNetMsgMaker msgMaker(PROTOCOL_VERSION); LOCK(cs_main); static int nHighestFastAnnounce = 0; if (pindex->nHeight <= nHighestFastAnnounce) { return; } nHighestFastAnnounce = pindex->nHeight; uint256 hashBlock(pblock->GetHash()); { LOCK(cs_most_recent_block); most_recent_block_hash = hashBlock; most_recent_block = pblock; most_recent_compact_block = pcmpctblock; } connman->ForEachNode([this, &pcmpctblock, pindex, &msgMaker, &hashBlock](CNode *pnode) { // TODO: Avoid the repeated-serialization here if (pnode->nVersion < INVALID_CB_NO_BAN_VERSION || pnode->fDisconnect) { return; } ProcessBlockAvailability(pnode->GetId()); CNodeState &state = *State(pnode->GetId()); // If the peer has, or we announced to them the previous block already, // but we don't think they have this one, go ahead and announce it. if (state.fPreferHeaderAndIDs && !PeerHasHeader(&state, pindex) && PeerHasHeader(&state, pindex->pprev)) { LogPrint(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", "PeerLogicValidation::NewPoWValidBlock", hashBlock.ToString(), pnode->id); connman->PushMessage( pnode, msgMaker.Make(NetMsgType::CMPCTBLOCK, *pcmpctblock)); state.pindexBestHeaderSent = pindex; } }); } void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) { const int nNewHeight = pindexNew->nHeight; connman->SetBestHeight(nNewHeight); if (!fInitialDownload) { // Find the hashes of all blocks that weren't previously in the best // chain. std::vector vHashes; const CBlockIndex *pindexToAnnounce = pindexNew; while (pindexToAnnounce != pindexFork) { vHashes.push_back(pindexToAnnounce->GetBlockHash()); pindexToAnnounce = pindexToAnnounce->pprev; if (vHashes.size() == MAX_BLOCKS_TO_ANNOUNCE) { // Limit announcements in case of a huge reorganization. Rely on // the peer's synchronization mechanism in that case. break; } } // Relay inventory, but don't relay old inventory during initial block // download. connman->ForEachNode([nNewHeight, &vHashes](CNode *pnode) { if (nNewHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : 0)) { for (const uint256 &hash : boost::adaptors::reverse(vHashes)) { pnode->PushBlockHash(hash); } } }); connman->WakeMessageHandler(); } nTimeBestReceived = GetTime(); } void PeerLogicValidation::BlockChecked(const CBlock &block, const CValidationState &state) { LOCK(cs_main); const uint256 hash(block.GetHash()); std::map>::iterator it = mapBlockSource.find(hash); int nDoS = 0; if (state.IsInvalid(nDoS)) { // Don't send reject message with code 0 or an internal reject code. if (it != mapBlockSource.end() && State(it->second.first) && state.GetRejectCode() > 0 && state.GetRejectCode() < REJECT_INTERNAL) { CBlockReject reject = { uint8_t(state.GetRejectCode()), state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), hash}; State(it->second.first)->rejects.push_back(reject); if (nDoS > 0 && it->second.second) { Misbehaving(it->second.first, nDoS, state.GetRejectReason()); } } } // Check that: // 1. The block is valid // 2. We're not in initial block download // 3. This is currently the best block we're aware of. We haven't updated // the tip yet so we have no way to check this directly here. Instead we // just check that there are currently no other blocks in flight. else if (state.IsValid() && !IsInitialBlockDownload() && mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) { if (it != mapBlockSource.end()) { MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first, *connman); } } if (it != mapBlockSource.end()) { mapBlockSource.erase(it); } } ////////////////////////////////////////////////////////////////////////////// // // Messages // static bool AlreadyHave(const CInv &inv) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { switch (inv.type) { case MSG_TX: { assert(recentRejects); if (chainActive.Tip()->GetBlockHash() != hashRecentRejectsChainTip) { // If the chain tip has changed previously rejected transactions // might be now valid, e.g. due to a nLockTime'd tx becoming // valid, or a double-spend. Reset the rejects filter and give // those txs a second chance. hashRecentRejectsChainTip = chainActive.Tip()->GetBlockHash(); recentRejects->reset(); } // Use pcoinsTip->HaveCoinInCache as a quick approximation to // exclude requesting or processing some txs which have already been // included in a block. As this is best effort, we only check for // output 0 and 1. This works well enough in practice and we get // diminishing returns with 2 onward. return recentRejects->contains(inv.hash) || mempool.exists(inv.hash) || mapOrphanTransactions.count(inv.hash) || pcoinsTip->HaveCoinInCache(COutPoint(inv.hash, 0)) || pcoinsTip->HaveCoinInCache(COutPoint(inv.hash, 1)); } case MSG_BLOCK: return mapBlockIndex.count(inv.hash); } // Don't know what it is, just say we already got one return true; } static void RelayTransaction(const CTransaction &tx, CConnman &connman) { CInv inv(MSG_TX, tx.GetId()); connman.ForEachNode([&inv](CNode *pnode) { pnode->PushInventory(inv); }); } static void RelayAddress(const CAddress &addr, bool fReachable, CConnman &connman) { // Limited relaying of addresses outside our network(s) unsigned int nRelayNodes = fReachable ? 2 : 1; // Relay to a limited number of other nodes. // Use deterministic randomness to send to the same nodes for 24 hours at a // time so the addrKnowns of the chosen nodes prevent repeats. uint64_t hashAddr = addr.GetHash(); const CSipHasher hasher = connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY) .Write(hashAddr << 32) .Write((GetTime() + hashAddr) / (24 * 60 * 60)); FastRandomContext insecure_rand; std::array, 2> best{ {{0, nullptr}, {0, nullptr}}}; assert(nRelayNodes <= best.size()); auto sortfunc = [&best, &hasher, nRelayNodes](CNode *pnode) { if (pnode->nVersion >= CADDR_TIME_VERSION) { uint64_t hashKey = CSipHasher(hasher).Write(pnode->id).Finalize(); for (unsigned int i = 0; i < nRelayNodes; i++) { if (hashKey > best[i].first) { std::copy(best.begin() + i, best.begin() + nRelayNodes - 1, best.begin() + i + 1); best[i] = std::make_pair(hashKey, pnode); break; } } } }; auto pushfunc = [&addr, &best, nRelayNodes, &insecure_rand] { for (unsigned int i = 0; i < nRelayNodes && best[i].first != 0; i++) { best[i].second->PushAddress(addr, insecure_rand); } }; connman.ForEachNodeThen(std::move(sortfunc), std::move(pushfunc)); } static void ProcessGetData(const Config &config, CNode *pfrom, const Consensus::Params &consensusParams, CConnman &connman, const std::atomic &interruptMsgProc) { std::deque::iterator it = pfrom->vRecvGetData.begin(); std::vector vNotFound; const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); LOCK(cs_main); while (it != pfrom->vRecvGetData.end()) { // Don't bother if send buffer is too full to respond anyway. if (pfrom->fPauseSend) { break; } const CInv &inv = *it; { if (interruptMsgProc) { return; } it++; if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK || inv.type == MSG_CMPCT_BLOCK) { bool send = false; BlockMap::iterator mi = mapBlockIndex.find(inv.hash); if (mi != mapBlockIndex.end()) { if (mi->second->nChainTx && !mi->second->IsValid(BlockValidity::SCRIPTS) && mi->second->IsValid(BlockValidity::TREE)) { // If we have the block and all of its parents, but have // not yet validated it, we might be in the middle of // connecting it (ie in the unlock of cs_main before // ActivateBestChain but after AcceptBlock). In this // case, we need to run ActivateBestChain prior to // checking the relay conditions below. std::shared_ptr a_recent_block; { LOCK(cs_most_recent_block); a_recent_block = most_recent_block; } CValidationState dummy; ActivateBestChain(config, dummy, a_recent_block); } if (chainActive.Contains(mi->second)) { send = true; } else { static const int nOneMonth = 30 * 24 * 60 * 60; // To prevent fingerprinting attacks, only send blocks // outside of the active chain if they are valid, and no // more than a month older (both in time, and in best // equivalent proof of work) than the best header chain // we know about. send = mi->second->IsValid(BlockValidity::SCRIPTS) && (pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - mi->second->GetBlockTime() < nOneMonth) && (GetBlockProofEquivalentTime( *pindexBestHeader, *mi->second, *pindexBestHeader, consensusParams) < nOneMonth); if (!send) { LogPrintf("%s: ignoring request from peer=%i for " "old block that isn't in the main " "chain\n", __func__, pfrom->GetId()); } } } // Disconnect node in case we have reached the outbound limit // for serving historical blocks never disconnect whitelisted // nodes. // assume > 1 week = historical static const int nOneWeek = 7 * 24 * 60 * 60; if (send && connman.OutboundTargetReached(true) && (((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - mi->second->GetBlockTime() > nOneWeek)) || inv.type == MSG_FILTERED_BLOCK) && !pfrom->fWhitelisted) { LogPrint(BCLog::NET, "historical block serving limit " "reached, disconnect peer=%d\n", pfrom->GetId()); // disconnect node pfrom->fDisconnect = true; send = false; } // Pruned nodes may have deleted the block, so check whether // it's available before trying to send. if (send && (mi->second->nStatus.hasData())) { // Send block from disk CBlock block; if (!ReadBlockFromDisk(block, (*mi).second, config)) { assert(!"cannot load block from disk"); } if (inv.type == MSG_BLOCK) { connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::BLOCK, block)); } else if (inv.type == MSG_FILTERED_BLOCK) { bool sendMerkleBlock = false; CMerkleBlock merkleBlock; { LOCK(pfrom->cs_filter); if (pfrom->pfilter) { sendMerkleBlock = true; merkleBlock = CMerkleBlock(block, *pfrom->pfilter); } } if (sendMerkleBlock) { connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::MERKLEBLOCK, merkleBlock)); // CMerkleBlock just contains hashes, so also push // any transactions in the block the client did not // see. This avoids hurting performance by // pointlessly requiring a round-trip. Note that // there is currently no way for a node to request // any single transactions we didn't send here - // they must either disconnect and retry or request // the full block. Thus, the protocol spec specified // allows for us to provide duplicate txn here, // however we MUST always provide at least what the // remote peer needs. typedef std::pair PairType; for (PairType &pair : merkleBlock.vMatchedTxn) { connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::TX, *block.vtx[pair.first])); } } // else // no response } else if (inv.type == MSG_CMPCT_BLOCK) { // If a peer is asking for old blocks, we're almost // guaranteed they won't have a useful mempool to match // against a compact block, and we don't feel like // constructing the object for them, so instead we // respond with the full, non-compact block. int nSendFlags = 0; if (CanDirectFetch(consensusParams) && mi->second->nHeight >= chainActive.Height() - MAX_CMPCTBLOCK_DEPTH) { CBlockHeaderAndShortTxIDs cmpctblock(block); connman.PushMessage( pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); } else { connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCK, block)); } } // Trigger the peer node to send a getblocks request for the // next batch of inventory. if (inv.hash == pfrom->hashContinue) { // Bypass PushInventory, this must send even if // redundant, and we want it right after the last block // so they don't wait for other stuff first. std::vector vInv; vInv.push_back( CInv(MSG_BLOCK, chainActive.Tip()->GetBlockHash())); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::INV, vInv)); pfrom->hashContinue.SetNull(); } } } else if (inv.type == MSG_TX) { // Send stream from relay memory bool push = false; auto mi = mapRelay.find(inv.hash); int nSendFlags = 0; if (mi != mapRelay.end()) { connman.PushMessage( pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *mi->second)); push = true; } else if (pfrom->timeLastMempoolReq) { auto txinfo = mempool.info(inv.hash); // To protect privacy, do not answer getdata using the // mempool when that TX couldn't have been INVed in reply to // a MEMPOOL request. if (txinfo.tx && txinfo.nTime <= pfrom->timeLastMempoolReq) { connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *txinfo.tx)); push = true; } } if (!push) { vNotFound.push_back(inv); } } // Track requests for our stuff. GetMainSignals().Inventory(inv.hash); if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK || inv.type == MSG_CMPCT_BLOCK) { break; } } } pfrom->vRecvGetData.erase(pfrom->vRecvGetData.begin(), it); if (!vNotFound.empty()) { // Let the peer know that we didn't find what it asked for, so it // doesn't have to wait around forever. Currently only SPV clients // actually care about this message: it's needed when they are // recursively walking the dependencies of relevant unconfirmed // transactions. SPV clients want to do that because they want to know // about (and store and rebroadcast and risk analyze) the dependencies // of transactions relevant to them, without having to download the // entire memory pool. connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::NOTFOUND, vNotFound)); } } inline static void SendBlockTransactions(const CBlock &block, const BlockTransactionsRequest &req, CNode *pfrom, CConnman &connman) { BlockTransactions resp(req); for (size_t i = 0; i < req.indices.size(); i++) { if (req.indices[i] >= block.vtx.size()) { LOCK(cs_main); Misbehaving(pfrom, 100, "out-of-bound-tx-index"); LogPrintf( "Peer %d sent us a getblocktxn with out-of-bounds tx indices", pfrom->id); return; } resp.txn[i] = block.vtx[req.indices[i]]; } LOCK(cs_main); const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); int nSendFlags = 0; connman.PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCKTXN, resp)); } static bool ProcessMessage(const Config &config, CNode *pfrom, const std::string &strCommand, CDataStream &vRecv, int64_t nTimeReceived, const CChainParams &chainparams, CConnman &connman, const std::atomic &interruptMsgProc) { LogPrint(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->id); if (gArgs.IsArgSet("-dropmessagestest") && GetRand(gArgs.GetArg("-dropmessagestest", 0)) == 0) { LogPrintf("dropmessagestest DROPPING RECV MESSAGE\n"); return true; } if (!(pfrom->GetLocalServices() & NODE_BLOOM) && (strCommand == NetMsgType::FILTERLOAD || strCommand == NetMsgType::FILTERADD)) { if (pfrom->nVersion >= NO_BLOOM_VERSION) { LOCK(cs_main); Misbehaving(pfrom, 100, "no-bloom-version"); return false; } else { pfrom->fDisconnect = true; return false; } } if (strCommand == NetMsgType::REJECT) { if (LogAcceptCategory(BCLog::NET)) { try { std::string strMsg; uint8_t ccode; std::string strReason; vRecv >> LIMITED_STRING(strMsg, CMessageHeader::COMMAND_SIZE) >> ccode >> LIMITED_STRING(strReason, MAX_REJECT_MESSAGE_LENGTH); std::ostringstream ss; ss << strMsg << " code " << itostr(ccode) << ": " << strReason; if (strMsg == NetMsgType::BLOCK || strMsg == NetMsgType::TX) { uint256 hash; vRecv >> hash; ss << ": hash " << hash.ToString(); } LogPrint(BCLog::NET, "Reject %s\n", SanitizeString(ss.str())); } catch (const std::ios_base::failure &) { // Avoid feedback loops by preventing reject messages from // triggering a new reject message. LogPrint(BCLog::NET, "Unparseable reject message received\n"); } } } else if (strCommand == NetMsgType::VERSION) { // Each connection can only send one version message if (pfrom->nVersion != 0) { connman.PushMessage( pfrom, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::REJECT, strCommand, REJECT_DUPLICATE, std::string("Duplicate version message"))); LOCK(cs_main); Misbehaving(pfrom, 1, "multiple-version"); return false; } int64_t nTime; CAddress addrMe; CAddress addrFrom; uint64_t nNonce = 1; uint64_t nServiceInt; ServiceFlags nServices; int nVersion; int nSendVersion; std::string strSubVer; std::string cleanSubVer; int nStartingHeight = -1; bool fRelay = true; vRecv >> nVersion >> nServiceInt >> nTime >> addrMe; nSendVersion = std::min(nVersion, PROTOCOL_VERSION); nServices = ServiceFlags(nServiceInt); if (!pfrom->fInbound) { connman.SetServices(pfrom->addr, nServices); } if (pfrom->nServicesExpected & ~nServices) { LogPrint(BCLog::NET, "peer=%d does not offer the expected services " "(%08x offered, %08x expected); " "disconnecting\n", pfrom->id, nServices, pfrom->nServicesExpected); connman.PushMessage( pfrom, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD, strprintf("Expected to offer services %08x", pfrom->nServicesExpected))); pfrom->fDisconnect = true; return false; } if (nVersion < MIN_PEER_PROTO_VERSION) { // disconnect from peers older than this proto version LogPrintf("peer=%d using obsolete version %i; disconnecting\n", pfrom->id, nVersion); connman.PushMessage( pfrom, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::REJECT, strCommand, REJECT_OBSOLETE, strprintf("Version must be %d or greater", MIN_PEER_PROTO_VERSION))); pfrom->fDisconnect = true; return false; } if (!vRecv.empty()) { vRecv >> addrFrom >> nNonce; } if (!vRecv.empty()) { vRecv >> LIMITED_STRING(strSubVer, MAX_SUBVERSION_LENGTH); cleanSubVer = SanitizeString(strSubVer); } if (!vRecv.empty()) { vRecv >> nStartingHeight; } if (!vRecv.empty()) { vRecv >> fRelay; } // Disconnect if we connected to ourself if (pfrom->fInbound && !connman.CheckIncomingNonce(nNonce)) { LogPrintf("connected to self at %s, disconnecting\n", pfrom->addr.ToString()); pfrom->fDisconnect = true; return true; } if (pfrom->fInbound && addrMe.IsRoutable()) { SeenLocal(addrMe); } // Be shy and don't send version until we hear if (pfrom->fInbound) { PushNodeVersion(config, pfrom, connman, GetAdjustedTime()); } connman.PushMessage( pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERACK)); pfrom->nServices = nServices; pfrom->SetAddrLocal(addrMe); { LOCK(pfrom->cs_SubVer); pfrom->strSubVer = strSubVer; pfrom->cleanSubVer = cleanSubVer; } pfrom->nStartingHeight = nStartingHeight; pfrom->fClient = !(nServices & NODE_NETWORK); { LOCK(pfrom->cs_filter); // set to true after we get the first filter* message pfrom->fRelayTxes = fRelay; } // Change version pfrom->SetSendVersion(nSendVersion); pfrom->nVersion = nVersion; // Potentially mark this peer as a preferred download peer. { LOCK(cs_main); UpdatePreferredDownload(pfrom, State(pfrom->GetId())); } if (!pfrom->fInbound) { // Advertise our address if (fListen && !IsInitialBlockDownload()) { CAddress addr = GetLocalAddress(&pfrom->addr, pfrom->GetLocalServices()); FastRandomContext insecure_rand; if (addr.IsRoutable()) { LogPrint(BCLog::NET, "ProcessMessages: advertising address %s\n", addr.ToString()); pfrom->PushAddress(addr, insecure_rand); } else if (IsPeerAddrLocalGood(pfrom)) { addr.SetIP(addrMe); LogPrint(BCLog::NET, "ProcessMessages: advertising address %s\n", addr.ToString()); pfrom->PushAddress(addr, insecure_rand); } } // Get recent addresses if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || connman.GetAddressCount() < 1000) { connman.PushMessage( pfrom, CNetMsgMaker(nSendVersion).Make(NetMsgType::GETADDR)); pfrom->fGetAddr = true; } connman.MarkAddressGood(pfrom->addr); } std::string remoteAddr; if (fLogIPs) { remoteAddr = ", peeraddr=" + pfrom->addr.ToString(); } LogPrintf("receive version message: [%s] %s: version %d, blocks=%d, " "us=%s, peer=%d%s\n", pfrom->addr.ToString().c_str(), cleanSubVer, pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString(), pfrom->id, remoteAddr); int64_t nTimeOffset = nTime - GetTime(); pfrom->nTimeOffset = nTimeOffset; AddTimeData(pfrom->addr, nTimeOffset); // If the peer is old enough to have the old alert system, send it the // final alert. if (pfrom->nVersion <= 70012) { CDataStream finalAlert( ParseHex("60010000000000000000000000ffffff7f00000000ffffff7ffef" "fff7f01ffffff7f00000000ffffff7f00ffffff7f002f55524745" "4e543a20416c657274206b657920636f6d70726f6d697365642c2" "075706772616465207265717569726564004630440220653febd6" "410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3ab" "d5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fec" "aae66ecf689bf71b50"), SER_NETWORK, PROTOCOL_VERSION); connman.PushMessage( pfrom, CNetMsgMaker(nSendVersion).Make("alert", finalAlert)); } // Feeler connections exist only to verify if address is online. if (pfrom->fFeeler) { assert(pfrom->fInbound == false); pfrom->fDisconnect = true; } return true; } else if (pfrom->nVersion == 0) { // Must have a version message before anything else LOCK(cs_main); Misbehaving(pfrom, 1, "missing-version"); return false; } // At this point, the outgoing message serialization version can't change. const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); if (strCommand == NetMsgType::VERACK) { pfrom->SetRecvVersion( std::min(pfrom->nVersion.load(), PROTOCOL_VERSION)); if (!pfrom->fInbound) { // Mark this node as currently connected, so we update its timestamp // later. LOCK(cs_main); State(pfrom->GetId())->fCurrentlyConnected = true; } if (pfrom->nVersion >= SENDHEADERS_VERSION) { // Tell our peer we prefer to receive headers rather than inv's // We send this to non-NODE NETWORK peers as well, because even // non-NODE NETWORK peers can announce blocks (such as pruning // nodes) connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDHEADERS)); } if (pfrom->nVersion >= SHORT_IDS_BLOCKS_VERSION) { // Tell our peer we are willing to provide version 1 or 2 // cmpctblocks. However, we do not request new block announcements // using cmpctblock messages. We send this to non-NODE NETWORK peers // as well, because they may wish to request compact blocks from us. bool fAnnounceUsingCMPCTBLOCK = false; uint64_t nCMPCTBLOCKVersion = 1; connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); } pfrom->fSuccessfullyConnected = true; } else if (!pfrom->fSuccessfullyConnected) { // Must have a verack message before anything else LOCK(cs_main); Misbehaving(pfrom, 1, "missing-verack"); return false; } else if (strCommand == NetMsgType::ADDR) { std::vector vAddr; vRecv >> vAddr; // Don't want addr from older versions unless seeding if (pfrom->nVersion < CADDR_TIME_VERSION && connman.GetAddressCount() > 1000) { return true; } if (vAddr.size() > 1000) { LOCK(cs_main); Misbehaving(pfrom, 20, "oversized-addr"); return error("message addr size() = %u", vAddr.size()); } // Store the new addresses std::vector vAddrOk; int64_t nNow = GetAdjustedTime(); int64_t nSince = nNow - 10 * 60; for (CAddress &addr : vAddr) { if (interruptMsgProc) { return true; } if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES) { continue; } if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60) { addr.nTime = nNow - 5 * 24 * 60 * 60; } pfrom->AddAddressKnown(addr); bool fReachable = IsReachable(addr); if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable()) { // Relay to a limited number of other nodes RelayAddress(addr, fReachable, connman); } // Do not store addresses outside our network if (fReachable) { vAddrOk.push_back(addr); } } connman.AddNewAddresses(vAddrOk, pfrom->addr, 2 * 60 * 60); if (vAddr.size() < 1000) { pfrom->fGetAddr = false; } if (pfrom->fOneShot) { pfrom->fDisconnect = true; } } else if (strCommand == NetMsgType::SENDHEADERS) { LOCK(cs_main); State(pfrom->GetId())->fPreferHeaders = true; } else if (strCommand == NetMsgType::SENDCMPCT) { bool fAnnounceUsingCMPCTBLOCK = false; uint64_t nCMPCTBLOCKVersion = 0; vRecv >> fAnnounceUsingCMPCTBLOCK >> nCMPCTBLOCKVersion; if (nCMPCTBLOCKVersion == 1) { LOCK(cs_main); // fProvidesHeaderAndIDs is used to "lock in" version of compact // blocks we send. if (!State(pfrom->GetId())->fProvidesHeaderAndIDs) { State(pfrom->GetId())->fProvidesHeaderAndIDs = true; } State(pfrom->GetId())->fPreferHeaderAndIDs = fAnnounceUsingCMPCTBLOCK; if (!State(pfrom->GetId())->fSupportsDesiredCmpctVersion) { State(pfrom->GetId())->fSupportsDesiredCmpctVersion = true; } } } else if (strCommand == NetMsgType::INV) { std::vector vInv; vRecv >> vInv; if (vInv.size() > MAX_INV_SZ) { LOCK(cs_main); Misbehaving(pfrom, 20, "oversized-inv"); return error("message inv size() = %u", vInv.size()); } bool fBlocksOnly = !fRelayTxes; // Allow whitelisted peers to send data other than blocks in blocks only // mode if whitelistrelay is true if (pfrom->fWhitelisted && gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)) { fBlocksOnly = false; } LOCK(cs_main); std::vector vToFetch; for (size_t nInv = 0; nInv < vInv.size(); nInv++) { CInv &inv = vInv[nInv]; if (interruptMsgProc) { return true; } bool fAlreadyHave = AlreadyHave(inv); LogPrint(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom->id); if (inv.type == MSG_BLOCK) { UpdateBlockAvailability(pfrom->GetId(), inv.hash); if (!fAlreadyHave && !fImporting && !fReindex && !mapBlocksInFlight.count(inv.hash)) { // We used to request the full block here, but since // headers-announcements are now the primary method of // announcement on the network, and since, in the case that // a node fell back to inv we probably have a reorg which we // should get the headers for first, we now only provide a // getheaders response here. When we receive the headers, we // will then ask for the blocks we need. connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), inv.hash)); LogPrint(BCLog::NET, "getheaders (%d) %s to peer=%d\n", pindexBestHeader->nHeight, inv.hash.ToString(), pfrom->id); } } else { pfrom->AddInventoryKnown(inv); if (fBlocksOnly) { LogPrint(BCLog::NET, "transaction (%s) inv sent in " "violation of protocol peer=%d\n", inv.hash.ToString(), pfrom->id); } else if (!fAlreadyHave && !fImporting && !fReindex && !IsInitialBlockDownload()) { pfrom->AskFor(inv); } } // Track requests for our stuff GetMainSignals().Inventory(inv.hash); } if (!vToFetch.empty()) { connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vToFetch)); } } else if (strCommand == NetMsgType::GETDATA) { std::vector vInv; vRecv >> vInv; if (vInv.size() > MAX_INV_SZ) { LOCK(cs_main); Misbehaving(pfrom, 20, "too-many-inv"); return error("message getdata size() = %u", vInv.size()); } LogPrint(BCLog::NET, "received getdata (%u invsz) peer=%d\n", vInv.size(), pfrom->id); if (vInv.size() > 0) { LogPrint(BCLog::NET, "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom->id); } pfrom->vRecvGetData.insert(pfrom->vRecvGetData.end(), vInv.begin(), vInv.end()); ProcessGetData(config, pfrom, chainparams.GetConsensus(), connman, interruptMsgProc); } else if (strCommand == NetMsgType::GETBLOCKS) { CBlockLocator locator; uint256 hashStop; vRecv >> locator >> hashStop; // We might have announced the currently-being-connected tip using a // compact block, which resulted in the peer sending a getblocks // request, which we would otherwise respond to without the new block. // To avoid this situation we simply verify that we are on our best // known chain now. This is super overkill, but we handle it better // for getheaders requests, and there are no known nodes which support // compact blocks but still use getblocks to request blocks. { std::shared_ptr a_recent_block; { LOCK(cs_most_recent_block); a_recent_block = most_recent_block; } CValidationState dummy; ActivateBestChain(config, dummy, a_recent_block); } LOCK(cs_main); // Find the last block the caller has in the main chain const CBlockIndex *pindex = FindForkInGlobalIndex(chainActive, locator); // Send the rest of the chain if (pindex) { pindex = chainActive.Next(pindex); } int nLimit = 500; LogPrint(BCLog::NET, "getblocks %d to %s limit %d from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), nLimit, pfrom->id); for (; pindex; pindex = chainActive.Next(pindex)) { if (pindex->GetBlockHash() == hashStop) { LogPrint(BCLog::NET, " getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); break; } // If pruning, don't inv blocks unless we have on disk and are // likely to still have for some reasonable time window (1 hour) // that block relay might require. const int nPrunedBlocksLikelyToHave = MIN_BLOCKS_TO_KEEP - 3600 / chainparams.GetConsensus().nPowTargetSpacing; if (fPruneMode && (!pindex->nStatus.hasData() || pindex->nHeight <= chainActive.Tip()->nHeight - nPrunedBlocksLikelyToHave)) { LogPrint( BCLog::NET, " getblocks stopping, pruned or too old block at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); break; } pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash())); if (--nLimit <= 0) { // When this block is requested, we'll send an inv that'll // trigger the peer to getblocks the next batch of inventory. LogPrint(BCLog::NET, " getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); pfrom->hashContinue = pindex->GetBlockHash(); break; } } } else if (strCommand == NetMsgType::GETBLOCKTXN) { BlockTransactionsRequest req; vRecv >> req; std::shared_ptr recent_block; { LOCK(cs_most_recent_block); if (most_recent_block_hash == req.blockhash) { recent_block = most_recent_block; } // Unlock cs_most_recent_block to avoid cs_main lock inversion } if (recent_block) { SendBlockTransactions(*recent_block, req, pfrom, connman); return true; } LOCK(cs_main); BlockMap::iterator it = mapBlockIndex.find(req.blockhash); if (it == mapBlockIndex.end() || !it->second->nStatus.hasData()) { LogPrintf("Peer %d sent us a getblocktxn for a block we don't have", pfrom->id); return true; } if (it->second->nHeight < chainActive.Height() - MAX_BLOCKTXN_DEPTH) { // If an older block is requested (should never happen in practice, // but can happen in tests) send a block response instead of a // blocktxn response. Sending a full block response instead of a // small blocktxn response is preferable in the case where a peer // might maliciously send lots of getblocktxn requests to trigger // expensive disk reads, because it will require the peer to // actually receive all the data read from disk over the network. LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block > %i deep", pfrom->id, MAX_BLOCKTXN_DEPTH); CInv inv; inv.type = MSG_BLOCK; inv.hash = req.blockhash; pfrom->vRecvGetData.push_back(inv); ProcessGetData(config, pfrom, chainparams.GetConsensus(), connman, interruptMsgProc); return true; } CBlock block; bool ret = ReadBlockFromDisk(block, it->second, config); assert(ret); SendBlockTransactions(block, req, pfrom, connman); } else if (strCommand == NetMsgType::GETHEADERS) { CBlockLocator locator; uint256 hashStop; vRecv >> locator >> hashStop; LOCK(cs_main); if (IsInitialBlockDownload() && !pfrom->fWhitelisted) { LogPrint(BCLog::NET, "Ignoring getheaders from peer=%d because " "node is in initial block download\n", pfrom->id); return true; } CNodeState *nodestate = State(pfrom->GetId()); const CBlockIndex *pindex = nullptr; if (locator.IsNull()) { // If locator is null, return the hashStop block BlockMap::iterator mi = mapBlockIndex.find(hashStop); if (mi == mapBlockIndex.end()) { return true; } pindex = (*mi).second; } else { // Find the last block the caller has in the main chain pindex = FindForkInGlobalIndex(chainActive, locator); if (pindex) { pindex = chainActive.Next(pindex); } } // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx // count at the end std::vector vHeaders; int nLimit = MAX_HEADERS_RESULTS; LogPrint(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom->id); for (; pindex; pindex = chainActive.Next(pindex)) { vHeaders.push_back(pindex->GetBlockHeader()); if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop) { break; } } // pindex can be nullptr either if we sent chainActive.Tip() OR // if our peer has chainActive.Tip() (and thus we are sending an empty // headers message). In both cases it's safe to update // pindexBestHeaderSent to be our tip. // // It is important that we simply reset the BestHeaderSent value here, // and not max(BestHeaderSent, newHeaderSent). We might have announced // the currently-being-connected tip using a compact block, which // resulted in the peer sending a headers request, which we respond to // without the new block. By resetting the BestHeaderSent, we ensure we // will re-announce the new block via headers (or compact blocks again) // in the SendMessages logic. nodestate->pindexBestHeaderSent = pindex ? pindex : chainActive.Tip(); connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); } else if (strCommand == NetMsgType::TX) { // Stop processing the transaction early if // We are in blocks only mode and peer is either not whitelisted or // whitelistrelay is off if (!fRelayTxes && (!pfrom->fWhitelisted || !gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY))) { LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom->id); return true; } std::deque vWorkQueue; std::vector vEraseQueue; CTransactionRef ptx; vRecv >> ptx; const CTransaction &tx = *ptx; CInv inv(MSG_TX, tx.GetId()); pfrom->AddInventoryKnown(inv); LOCK(cs_main); bool fMissingInputs = false; CValidationState state; pfrom->setAskFor.erase(inv.hash); mapAlreadyAskedFor.erase(inv.hash); if (!AlreadyHave(inv) && AcceptToMemoryPool(config, mempool, state, ptx, true, &fMissingInputs)) { mempool.check(pcoinsTip); RelayTransaction(tx, connman); for (size_t i = 0; i < tx.vout.size(); i++) { vWorkQueue.emplace_back(inv.hash, i); } pfrom->nLastTXTime = GetTime(); LogPrint(BCLog::MEMPOOL, "AcceptToMemoryPool: peer=%d: accepted %s " "(poolsz %u txn, %u kB)\n", pfrom->id, tx.GetId().ToString(), mempool.size(), mempool.DynamicMemoryUsage() / 1000); // Recursively process any orphan transactions that depended on this // one std::set setMisbehaving; while (!vWorkQueue.empty()) { auto itByPrev = mapOrphanTransactionsByPrev.find(vWorkQueue.front()); vWorkQueue.pop_front(); if (itByPrev == mapOrphanTransactionsByPrev.end()) { continue; } for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) { const CTransactionRef &porphanTx = (*mi)->second.tx; const CTransaction &orphanTx = *porphanTx; const uint256 &orphanId = orphanTx.GetId(); NodeId fromPeer = (*mi)->second.fromPeer; bool fMissingInputs2 = false; // Use a dummy CValidationState so someone can't setup nodes // to counter-DoS based on orphan resolution (that is, // feeding people an invalid transaction based on LegitTxX // in order to get anyone relaying LegitTxX banned) CValidationState stateDummy; if (setMisbehaving.count(fromPeer)) { continue; } if (AcceptToMemoryPool(config, mempool, stateDummy, porphanTx, true, &fMissingInputs2)) { LogPrint(BCLog::MEMPOOL, " accepted orphan tx %s\n", orphanId.ToString()); RelayTransaction(orphanTx, connman); for (size_t i = 0; i < orphanTx.vout.size(); i++) { vWorkQueue.emplace_back(orphanId, i); } vEraseQueue.push_back(orphanId); } else if (!fMissingInputs2) { int nDos = 0; if (stateDummy.IsInvalid(nDos) && nDos > 0) { // Punish peer that gave us an invalid orphan tx Misbehaving(fromPeer, nDos, "invalid-orphan-tx"); setMisbehaving.insert(fromPeer); LogPrint(BCLog::MEMPOOL, " invalid orphan tx %s\n", orphanId.ToString()); } // Has inputs but not accepted to mempool // Probably non-standard or insufficient fee/priority LogPrint(BCLog::MEMPOOL, " removed orphan tx %s\n", orphanId.ToString()); vEraseQueue.push_back(orphanId); if (!stateDummy.CorruptionPossible()) { // Do not use rejection cache for witness // transactions or witness-stripped transactions, as // they can have been malleated. See // https://github.com/bitcoin/bitcoin/issues/8279 // for details. assert(recentRejects); recentRejects->insert(orphanId); } } mempool.check(pcoinsTip); } } for (uint256 hash : vEraseQueue) { EraseOrphanTx(hash); } } else if (fMissingInputs) { // It may be the case that the orphans parents have all been // rejected. bool fRejectedParents = false; for (const CTxIn &txin : tx.vin) { if (recentRejects->contains(txin.prevout.GetTxId())) { fRejectedParents = true; break; } } if (!fRejectedParents) { for (const CTxIn &txin : tx.vin) { // FIXME: MSG_TX should use a TxHash, not a TxId. CInv _inv(MSG_TX, txin.prevout.GetTxId()); pfrom->AddInventoryKnown(_inv); if (!AlreadyHave(_inv)) { pfrom->AskFor(_inv); } } AddOrphanTx(ptx, pfrom->GetId()); // DoS prevention: do not allow mapOrphanTransactions to grow // unbounded unsigned int nMaxOrphanTx = (unsigned int)std::max( int64_t(0), gArgs.GetArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS)); unsigned int nEvicted = LimitOrphanTxSize(nMaxOrphanTx); if (nEvicted > 0) { LogPrint(BCLog::MEMPOOL, "mapOrphan overflow, removed %u tx\n", nEvicted); } } else { LogPrint(BCLog::MEMPOOL, "not keeping orphan with rejected parents %s\n", tx.GetId().ToString()); // We will continue to reject this tx since it has rejected // parents so avoid re-requesting it from other peers. recentRejects->insert(tx.GetId()); } } else { if (!state.CorruptionPossible()) { // Do not use rejection cache for witness transactions or // witness-stripped transactions, as they can have been // malleated. See https://github.com/bitcoin/bitcoin/issues/8279 // for details. assert(recentRejects); recentRejects->insert(tx.GetId()); if (RecursiveDynamicUsage(*ptx) < 100000) { AddToCompactExtraTransactions(ptx); } } if (pfrom->fWhitelisted && gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) { // Always relay transactions received from whitelisted peers, // even if they were already in the mempool or rejected from it // due to policy, allowing the node to function as a gateway for // nodes hidden behind it. // // Never relay transactions that we would assign a non-zero DoS // score for, as we expect peers to do the same with us in that // case. int nDoS = 0; if (!state.IsInvalid(nDoS) || nDoS == 0) { LogPrintf("Force relaying tx %s from whitelisted peer=%d\n", tx.GetId().ToString(), pfrom->id); RelayTransaction(tx, connman); } else { LogPrintf("Not relaying invalid transaction %s from " "whitelisted peer=%d (%s)\n", tx.GetId().ToString(), pfrom->id, FormatStateMessage(state)); } } } int nDoS = 0; if (state.IsInvalid(nDoS)) { LogPrint( BCLog::MEMPOOLREJ, "%s from peer=%d was not accepted: %s\n", tx.GetHash().ToString(), pfrom->id, FormatStateMessage(state)); // Never send AcceptToMemoryPool's internal codes over P2P. if (state.GetRejectCode() > 0 && state.GetRejectCode() < REJECT_INTERNAL) { connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::REJECT, strCommand, uint8_t(state.GetRejectCode()), state.GetRejectReason().substr( 0, MAX_REJECT_MESSAGE_LENGTH), inv.hash)); } if (nDoS > 0) { Misbehaving(pfrom, nDoS, state.GetRejectReason()); } } } // Ignore blocks received while importing else if (strCommand == NetMsgType::CMPCTBLOCK && !fImporting && !fReindex) { CBlockHeaderAndShortTxIDs cmpctblock; vRecv >> cmpctblock; { LOCK(cs_main); if (mapBlockIndex.find(cmpctblock.header.hashPrevBlock) == mapBlockIndex.end()) { // Doesn't connect (or is genesis), instead of DoSing in // AcceptBlockHeader, request deeper headers if (!IsInitialBlockDownload()) { connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256())); } return true; } } const CBlockIndex *pindex = nullptr; CValidationState state; if (!ProcessNewBlockHeaders(config, {cmpctblock.header}, state, &pindex)) { int nDoS; if (state.IsInvalid(nDoS)) { if (nDoS > 0) { LOCK(cs_main); Misbehaving(pfrom, nDoS, state.GetRejectReason()); } LogPrintf("Peer %d sent us invalid header via cmpctblock\n", pfrom->id); return true; } } // When we succeed in decoding a block's txids from a cmpctblock // message we typically jump to the BLOCKTXN handling code, with a // dummy (empty) BLOCKTXN message, to re-use the logic there in // completing processing of the putative block (without cs_main). bool fProcessBLOCKTXN = false; CDataStream blockTxnMsg(SER_NETWORK, PROTOCOL_VERSION); // If we end up treating this as a plain headers message, call that as // well // without cs_main. bool fRevertToHeaderProcessing = false; CDataStream vHeadersMsg(SER_NETWORK, PROTOCOL_VERSION); // Keep a CBlock for "optimistic" compactblock reconstructions (see // below) std::shared_ptr pblock = std::make_shared(); bool fBlockReconstructed = false; { LOCK(cs_main); // If AcceptBlockHeader returned true, it set pindex assert(pindex); UpdateBlockAvailability(pfrom->GetId(), pindex->GetBlockHash()); std::map::iterator>>:: iterator blockInFlightIt = mapBlocksInFlight.find(pindex->GetBlockHash()); bool fAlreadyInFlight = blockInFlightIt != mapBlocksInFlight.end(); if (pindex->nStatus.hasData()) { // Nothing to do here return true; } if (pindex->nChainWork <= chainActive.Tip()->nChainWork || // We know something better pindex->nTx != 0) { // We had this block at some point, but pruned it if (fAlreadyInFlight) { // We requested this block for some reason, but our mempool // will probably be useless so we just grab the block via // normal getdata. std::vector vInv(1); vInv[0] = CInv(MSG_BLOCK, cmpctblock.header.GetHash()); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); } return true; } // If we're not close to tip yet, give up and let parallel block // fetch work its magic. if (!fAlreadyInFlight && !CanDirectFetch(chainparams.GetConsensus())) { return true; } CNodeState *nodestate = State(pfrom->GetId()); // We want to be a bit conservative just to be extra careful about // DoS possibilities in compact block processing... if (pindex->nHeight <= chainActive.Height() + 2) { if ((!fAlreadyInFlight && nodestate->nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) || (fAlreadyInFlight && blockInFlightIt->second.first == pfrom->GetId())) { std::list::iterator *queuedBlockIt = nullptr; if (!MarkBlockAsInFlight(config, pfrom->GetId(), pindex->GetBlockHash(), chainparams.GetConsensus(), pindex, &queuedBlockIt)) { if (!(*queuedBlockIt)->partialBlock) { (*queuedBlockIt) ->partialBlock.reset( new PartiallyDownloadedBlock(config, &mempool)); } else { // The block was already in flight using compact // blocks from the same peer. LogPrint(BCLog::NET, "Peer sent us compact block " "we were already syncing!\n"); return true; } } PartiallyDownloadedBlock &partialBlock = *(*queuedBlockIt)->partialBlock; ReadStatus status = partialBlock.InitData(cmpctblock, vExtraTxnForCompact); if (status == READ_STATUS_INVALID) { // Reset in-flight state in case of whitelist MarkBlockAsReceived(pindex->GetBlockHash()); Misbehaving(pfrom, 100, "invalid-cmpctblk"); LogPrintf("Peer %d sent us invalid compact block\n", pfrom->id); return true; } else if (status == READ_STATUS_FAILED) { // Duplicate txindices, the block is now in-flight, so // just request it. std::vector vInv(1); vInv[0] = CInv(MSG_BLOCK, cmpctblock.header.GetHash()); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); return true; } BlockTransactionsRequest req; for (size_t i = 0; i < cmpctblock.BlockTxCount(); i++) { if (!partialBlock.IsTxAvailable(i)) { req.indices.push_back(i); } } if (req.indices.empty()) { // Dirty hack to jump to BLOCKTXN code (TODO: move // message handling into their own functions) BlockTransactions txn; txn.blockhash = cmpctblock.header.GetHash(); blockTxnMsg << txn; fProcessBLOCKTXN = true; } else { req.blockhash = pindex->GetBlockHash(); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req)); } } else { // This block is either already in flight from a different // peer, or this peer has too many blocks outstanding to // download from. Optimistically try to reconstruct anyway // since we might be able to without any round trips. PartiallyDownloadedBlock tempBlock(config, &mempool); ReadStatus status = tempBlock.InitData(cmpctblock, vExtraTxnForCompact); if (status != READ_STATUS_OK) { // TODO: don't ignore failures return true; } std::vector dummy; status = tempBlock.FillBlock(*pblock, dummy); if (status == READ_STATUS_OK) { fBlockReconstructed = true; } } } else { if (fAlreadyInFlight) { // We requested this block, but its far into the future, so // our mempool will probably be useless - request the block // normally. std::vector vInv(1); vInv[0] = CInv(MSG_BLOCK, cmpctblock.header.GetHash()); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); return true; } else { // If this was an announce-cmpctblock, we want the same // treatment as a header message. Dirty hack to process as // if it were just a headers message (TODO: move message // handling into their own functions) std::vector headers; headers.push_back(cmpctblock.header); vHeadersMsg << headers; fRevertToHeaderProcessing = true; } } } // cs_main if (fProcessBLOCKTXN) { return ProcessMessage(config, pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, interruptMsgProc); } if (fRevertToHeaderProcessing) { return ProcessMessage(config, pfrom, NetMsgType::HEADERS, vHeadersMsg, nTimeReceived, chainparams, connman, interruptMsgProc); } if (fBlockReconstructed) { // If we got here, we were able to optimistically reconstruct a // block that is in flight from some other peer. { LOCK(cs_main); mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom->GetId(), false)); } bool fNewBlock = false; ProcessNewBlock(config, pblock, true, &fNewBlock); if (fNewBlock) { pfrom->nLastBlockTime = GetTime(); } // hold cs_main for CBlockIndex::IsValid() LOCK(cs_main); if (pindex->IsValid(BlockValidity::TRANSACTIONS)) { // Clear download state for this block, which is in process from // some other peer. We do this after calling. ProcessNewBlock so // that a malleated cmpctblock announcement can't be used to // interfere with block relay. MarkBlockAsReceived(pblock->GetHash()); } } } else if (strCommand == NetMsgType::BLOCKTXN && !fImporting && !fReindex) // Ignore blocks received while importing { BlockTransactions resp; vRecv >> resp; std::shared_ptr pblock = std::make_shared(); bool fBlockRead = false; { LOCK(cs_main); std::map::iterator>>:: iterator it = mapBlocksInFlight.find(resp.blockhash); if (it == mapBlocksInFlight.end() || !it->second.second->partialBlock || it->second.first != pfrom->GetId()) { LogPrint(BCLog::NET, "Peer %d sent us block transactions for block " "we weren't expecting\n", pfrom->id); return true; } PartiallyDownloadedBlock &partialBlock = *it->second.second->partialBlock; ReadStatus status = partialBlock.FillBlock(*pblock, resp.txn); if (status == READ_STATUS_INVALID) { // Reset in-flight state in case of whitelist. MarkBlockAsReceived(resp.blockhash); Misbehaving(pfrom, 100, "invalid-cmpctblk-txns"); LogPrintf("Peer %d sent us invalid compact block/non-matching " "block transactions\n", pfrom->id); return true; } else if (status == READ_STATUS_FAILED) { // Might have collided, fall back to getdata now :( std::vector invs; invs.push_back(CInv(MSG_BLOCK, resp.blockhash)); connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, invs)); } else { // Block is either okay, or possibly we received // READ_STATUS_CHECKBLOCK_FAILED. // Note that CheckBlock can only fail for one of a few reasons: // 1. bad-proof-of-work (impossible here, because we've already // accepted the header) // 2. merkleroot doesn't match the transactions given (already // caught in FillBlock with READ_STATUS_FAILED, so // impossible here) // 3. the block is otherwise invalid (eg invalid coinbase, // block is too big, too many legacy sigops, etc). // So if CheckBlock failed, #3 is the only possibility. // Under BIP 152, we don't DoS-ban unless proof of work is // invalid (we don't require all the stateless checks to have // been run). This is handled below, so just treat this as // though the block was successfully read, and rely on the // handling in ProcessNewBlock to ensure the block index is // updated, reject messages go out, etc. // it is now an empty pointer MarkBlockAsReceived(resp.blockhash); fBlockRead = true; // mapBlockSource is only used for sending reject messages and // DoS scores, so the race between here and cs_main in // ProcessNewBlock is fine. BIP 152 permits peers to relay // compact blocks after validating the header only; we should // not punish peers if the block turns out to be invalid. mapBlockSource.emplace(resp.blockhash, std::make_pair(pfrom->GetId(), false)); } } // Don't hold cs_main when we call into ProcessNewBlock if (fBlockRead) { bool fNewBlock = false; // Since we requested this block (it was in mapBlocksInFlight), // force it to be processed, even if it would not be a candidate for // new tip (missing previous block, chain not long enough, etc) ProcessNewBlock(config, pblock, true, &fNewBlock); if (fNewBlock) { pfrom->nLastBlockTime = GetTime(); } } } // Ignore headers received while importing else if (strCommand == NetMsgType::HEADERS && !fImporting && !fReindex) { std::vector headers; // Bypass the normal CBlock deserialization, as we don't want to risk // deserializing 2000 full blocks. unsigned int nCount = ReadCompactSize(vRecv); if (nCount > MAX_HEADERS_RESULTS) { LOCK(cs_main); Misbehaving(pfrom, 20, "too-many-headers"); return error("headers message size = %u", nCount); } headers.resize(nCount); for (unsigned int n = 0; n < nCount; n++) { vRecv >> headers[n]; // Ignore tx count; assume it is 0. ReadCompactSize(vRecv); } if (nCount == 0) { // Nothing interesting. Stop asking this peers for more headers. return true; } const CBlockIndex *pindexLast = nullptr; { LOCK(cs_main); CNodeState *nodestate = State(pfrom->GetId()); // If this looks like it could be a block announcement (nCount < // MAX_BLOCKS_TO_ANNOUNCE), use special logic for handling headers // that // don't connect: // - Send a getheaders message in response to try to connect the // chain. // - The peer can send up to MAX_UNCONNECTING_HEADERS in a row that // don't connect before giving DoS points // - Once a headers message is received that is valid and does // connect, // nUnconnectingHeaders gets reset back to 0. if (mapBlockIndex.find(headers[0].hashPrevBlock) == mapBlockIndex.end() && nCount < MAX_BLOCKS_TO_ANNOUNCE) { nodestate->nUnconnectingHeaders++; connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256())); LogPrint(BCLog::NET, "received header %s: missing prev block " "%s, sending getheaders (%d) to end " "(peer=%d, nUnconnectingHeaders=%d)\n", headers[0].GetHash().ToString(), headers[0].hashPrevBlock.ToString(), pindexBestHeader->nHeight, pfrom->id, nodestate->nUnconnectingHeaders); // Set hashLastUnknownBlock for this peer, so that if we // eventually get the headers - even from a different peer - // we can use this peer to download. UpdateBlockAvailability(pfrom->GetId(), headers.back().GetHash()); if (nodestate->nUnconnectingHeaders % MAX_UNCONNECTING_HEADERS == 0) { // The peer is sending us many headers we can't connect. Misbehaving(pfrom, 20, "too-many-unconnected-headers"); } return true; } uint256 hashLastBlock; for (const CBlockHeader &header : headers) { if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) { Misbehaving(pfrom, 20, "disconnected-header"); return error("non-continuous headers sequence"); } hashLastBlock = header.GetHash(); } } CValidationState state; if (!ProcessNewBlockHeaders(config, headers, state, &pindexLast)) { int nDoS; if (state.IsInvalid(nDoS)) { if (nDoS > 0) { LOCK(cs_main); Misbehaving(pfrom, nDoS, state.GetRejectReason()); } return error("invalid header received"); } } { LOCK(cs_main); CNodeState *nodestate = State(pfrom->GetId()); if (nodestate->nUnconnectingHeaders > 0) { LogPrint(BCLog::NET, "peer=%d: resetting nUnconnectingHeaders (%d -> 0)\n", pfrom->id, nodestate->nUnconnectingHeaders); } nodestate->nUnconnectingHeaders = 0; assert(pindexLast); UpdateBlockAvailability(pfrom->GetId(), pindexLast->GetBlockHash()); if (nCount == MAX_HEADERS_RESULTS) { // Headers message had its maximum size; the peer may have more // headers. // TODO: optimize: if pindexLast is an ancestor of // chainActive.Tip or pindexBestHeader, continue from there // instead. LogPrint( BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->id, pfrom->nStartingHeight); connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexLast), uint256())); } bool fCanDirectFetch = CanDirectFetch(chainparams.GetConsensus()); // If this set of headers is valid and ends in a block with at least // as much work as our tip, download as much as possible. if (fCanDirectFetch && pindexLast->IsValid(BlockValidity::TREE) && chainActive.Tip()->nChainWork <= pindexLast->nChainWork) { std::vector vToFetch; const CBlockIndex *pindexWalk = pindexLast; // Calculate all the blocks we'd need to switch to pindexLast, // up to a limit. while (pindexWalk && !chainActive.Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) { if (!pindexWalk->nStatus.hasData() && !mapBlocksInFlight.count(pindexWalk->GetBlockHash())) { // We don't have this block, and it's not yet in flight. vToFetch.push_back(pindexWalk); } pindexWalk = pindexWalk->pprev; } // If pindexWalk still isn't on our main chain, we're looking at // a very large reorg at a time we think we're close to caught // up to the main chain -- this shouldn't really happen. Bail // out on the direct fetch and rely on parallel download // instead. if (!chainActive.Contains(pindexWalk)) { LogPrint(BCLog::NET, "Large reorg, won't direct fetch to %s (%d)\n", pindexLast->GetBlockHash().ToString(), pindexLast->nHeight); } else { std::vector vGetData; // Download as much as possible, from earliest to latest. for (const CBlockIndex *pindex : boost::adaptors::reverse(vToFetch)) { if (nodestate->nBlocksInFlight >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) { // Can't download any more from this peer break; } vGetData.push_back( CInv(MSG_BLOCK, pindex->GetBlockHash())); MarkBlockAsInFlight(config, pfrom->GetId(), pindex->GetBlockHash(), chainparams.GetConsensus(), pindex); LogPrint(BCLog::NET, "Requesting block %s from peer=%d\n", pindex->GetBlockHash().ToString(), pfrom->id); } if (vGetData.size() > 1) { LogPrint(BCLog::NET, "Downloading blocks toward %s " "(%d) via headers direct fetch\n", pindexLast->GetBlockHash().ToString(), pindexLast->nHeight); } if (vGetData.size() > 0) { if (nodestate->fSupportsDesiredCmpctVersion && vGetData.size() == 1 && mapBlocksInFlight.size() == 1 && pindexLast->pprev->IsValid(BlockValidity::CHAIN)) { // In any case, we want to download using a compact // block, not a regular one. vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash); } connman.PushMessage( pfrom, msgMaker.Make(NetMsgType::GETDATA, vGetData)); } } } } } else if (strCommand == NetMsgType::BLOCK && !fImporting && !fReindex) // Ignore blocks received while importing { std::shared_ptr pblock = std::make_shared(); vRecv >> *pblock; LogPrint(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom->id); // Process all blocks from whitelisted peers, even if not requested, // unless we're still syncing with the network. Such an unrequested // block may still be processed, subject to the conditions in // AcceptBlock(). bool forceProcessing = pfrom->fWhitelisted && !IsInitialBlockDownload(); const uint256 hash(pblock->GetHash()); { LOCK(cs_main); // Also always process if we requested the block explicitly, as we // may need it even though it is not a candidate for a new best tip. forceProcessing |= MarkBlockAsReceived(hash); // mapBlockSource is only used for sending reject messages and DoS // scores, so the race between here and cs_main in ProcessNewBlock // is fine. mapBlockSource.emplace(hash, std::make_pair(pfrom->GetId(), true)); } bool fNewBlock = false; ProcessNewBlock(config, pblock, forceProcessing, &fNewBlock); if (fNewBlock) { pfrom->nLastBlockTime = GetTime(); } } else if (strCommand == NetMsgType::GETADDR) { // This asymmetric behavior for inbound and outbound connections was // introduced to prevent a fingerprinting attack: an attacker can send // specific fake addresses to users' AddrMan and later request them by // sending getaddr messages. Making nodes which are behind NAT and can // only make outgoing connections ignore the getaddr message mitigates // the attack. if (!pfrom->fInbound) { LogPrint(BCLog::NET, "Ignoring \"getaddr\" from outbound connection. peer=%d\n", pfrom->id); return true; } // Only send one GetAddr response per connection to reduce resource // waste and discourage addr stamping of INV announcements. if (pfrom->fSentAddr) { LogPrint(BCLog::NET, "Ignoring repeated \"getaddr\". peer=%d\n", pfrom->id); return true; } pfrom->fSentAddr = true; pfrom->vAddrToSend.clear(); std::vector vAddr = connman.GetAddresses(); FastRandomContext insecure_rand; for (const CAddress &addr : vAddr) { pfrom->PushAddress(addr, insecure_rand); } } else if (strCommand == NetMsgType::MEMPOOL) { if (!(pfrom->GetLocalServices() & NODE_BLOOM) && !pfrom->fWhitelisted) { LogPrint(BCLog::NET, "mempool request with bloom filters disabled, " "disconnect peer=%d\n", pfrom->GetId()); pfrom->fDisconnect = true; return true; } if (connman.OutboundTargetReached(false) && !pfrom->fWhitelisted) { LogPrint(BCLog::NET, "mempool request with bandwidth limit " "reached, disconnect peer=%d\n", pfrom->GetId()); pfrom->fDisconnect = true; return true; } LOCK(pfrom->cs_inventory); pfrom->fSendMempool = true; } else if (strCommand == NetMsgType::PING) { if (pfrom->nVersion > BIP0031_VERSION) { uint64_t nonce = 0; vRecv >> nonce; // Echo the message back with the nonce. This allows for two useful // features: // // 1) A remote node can quickly check if the connection is // operational. // 2) Remote nodes can measure the latency of the network thread. If // this node is overloaded it won't respond to pings quickly and the // remote node can avoid sending us more work, like chain download // requests. // // The nonce stops the remote getting confused between different // pings: without it, if the remote node sends a ping once per // second and this node takes 5 seconds to respond to each, the 5th // ping the remote sends would appear to return very quickly. connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::PONG, nonce)); } } else if (strCommand == NetMsgType::PONG) { int64_t pingUsecEnd = nTimeReceived; uint64_t nonce = 0; size_t nAvail = vRecv.in_avail(); bool bPingFinished = false; std::string sProblem; if (nAvail >= sizeof(nonce)) { vRecv >> nonce; // Only process pong message if there is an outstanding ping (old // ping without nonce should never pong) if (pfrom->nPingNonceSent != 0) { if (nonce == pfrom->nPingNonceSent) { // Matching pong received, this ping is no longer // outstanding bPingFinished = true; int64_t pingUsecTime = pingUsecEnd - pfrom->nPingUsecStart; if (pingUsecTime > 0) { // Successful ping time measurement, replace previous pfrom->nPingUsecTime = pingUsecTime; pfrom->nMinPingUsecTime = std::min( pfrom->nMinPingUsecTime.load(), pingUsecTime); } else { // This should never happen sProblem = "Timing mishap"; } } else { // Nonce mismatches are normal when pings are overlapping sProblem = "Nonce mismatch"; if (nonce == 0) { // This is most likely a bug in another implementation // somewhere; cancel this ping bPingFinished = true; sProblem = "Nonce zero"; } } } else { sProblem = "Unsolicited pong without ping"; } } else { // This is most likely a bug in another implementation somewhere; // cancel this ping bPingFinished = true; sProblem = "Short payload"; } if (!(sProblem.empty())) { LogPrint(BCLog::NET, "pong peer=%d: %s, %x expected, %x received, %u bytes\n", pfrom->id, sProblem, pfrom->nPingNonceSent, nonce, nAvail); } if (bPingFinished) { pfrom->nPingNonceSent = 0; } } else if (strCommand == NetMsgType::FILTERLOAD) { CBloomFilter filter; vRecv >> filter; if (!filter.IsWithinSizeConstraints()) { // There is no excuse for sending a too-large filter LOCK(cs_main); Misbehaving(pfrom, 100, "oversized-bloom-filter"); } else { LOCK(pfrom->cs_filter); delete pfrom->pfilter; pfrom->pfilter = new CBloomFilter(filter); pfrom->pfilter->UpdateEmptyFull(); pfrom->fRelayTxes = true; } } else if (strCommand == NetMsgType::FILTERADD) { std::vector vData; vRecv >> vData; // Nodes must NEVER send a data item > 520 bytes (the max size for a // script data object, and thus, the maximum size any matched object can // have) in a filteradd message. bool bad = false; if (vData.size() > MAX_SCRIPT_ELEMENT_SIZE) { bad = true; } else { LOCK(pfrom->cs_filter); if (pfrom->pfilter) { pfrom->pfilter->insert(vData); } else { bad = true; } } if (bad) { LOCK(cs_main); // The structure of this code doesn't really allow for a good error // code. We'll go generic. Misbehaving(pfrom, 100, "invalid-filteradd"); } } else if (strCommand == NetMsgType::FILTERCLEAR) { LOCK(pfrom->cs_filter); if (pfrom->GetLocalServices() & NODE_BLOOM) { delete pfrom->pfilter; pfrom->pfilter = new CBloomFilter(); } pfrom->fRelayTxes = true; } else if (strCommand == NetMsgType::FEEFILTER) { Amount newFeeFilter(0); vRecv >> newFeeFilter; if (MoneyRange(newFeeFilter)) { { LOCK(pfrom->cs_feeFilter); pfrom->minFeeFilter = newFeeFilter; } LogPrint(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom->id); } } else if (strCommand == NetMsgType::NOTFOUND) { // We do not care about the NOTFOUND message, but logging an Unknown // Command message would be undesirable as we transmit it ourselves. } else { // Ignore unknown commands for extensibility LogPrint(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(strCommand), pfrom->id); } return true; } static bool SendRejectsAndCheckIfBanned(CNode *pnode, CConnman &connman) { AssertLockHeld(cs_main); CNodeState &state = *State(pnode->GetId()); for (const CBlockReject &reject : state.rejects) { connman.PushMessage( pnode, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::REJECT, std::string(NetMsgType::BLOCK), reject.chRejectCode, reject.strRejectReason, reject.hashBlock)); } state.rejects.clear(); if (state.fShouldBan) { state.fShouldBan = false; if (pnode->fWhitelisted) { LogPrintf("Warning: not punishing whitelisted peer %s!\n", pnode->addr.ToString()); } else if (pnode->fAddnode) { LogPrintf("Warning: not punishing addnoded peer %s!\n", pnode->addr.ToString()); } else { pnode->fDisconnect = true; if (pnode->addr.IsLocal()) { LogPrintf("Warning: not banning local peer %s!\n", pnode->addr.ToString()); } else { connman.Ban(pnode->addr, BanReasonNodeMisbehaving); } } return true; } return false; } bool ProcessMessages(const Config &config, CNode *pfrom, CConnman &connman, const std::atomic &interruptMsgProc) { const CChainParams &chainparams = config.GetChainParams(); // // Message format // (4) message start // (12) command // (4) size // (4) checksum // (x) data // bool fMoreWork = false; if (!pfrom->vRecvGetData.empty()) { ProcessGetData(config, pfrom, chainparams.GetConsensus(), connman, interruptMsgProc); } if (pfrom->fDisconnect) { return false; } // this maintains the order of responses if (!pfrom->vRecvGetData.empty()) { return true; } // Don't bother if send buffer is too full to respond anyway if (pfrom->fPauseSend) { return false; } std::list msgs; { LOCK(pfrom->cs_vProcessMsg); if (pfrom->vProcessMsg.empty()) { return false; } // Just take one message msgs.splice(msgs.begin(), pfrom->vProcessMsg, pfrom->vProcessMsg.begin()); pfrom->nProcessQueueSize -= msgs.front().vRecv.size() + CMessageHeader::HEADER_SIZE; pfrom->fPauseRecv = pfrom->nProcessQueueSize > connman.GetReceiveFloodSize(); fMoreWork = !pfrom->vProcessMsg.empty(); } CNetMessage &msg(msgs.front()); msg.SetVersion(pfrom->GetRecvVersion()); // Scan for message start if (memcmp(std::begin(msg.hdr.pchMessageStart), std::begin(chainparams.NetMagic()), CMessageHeader::MESSAGE_START_SIZE) != 0) { LogPrintf("PROCESSMESSAGE: INVALID MESSAGESTART %s peer=%d\n", SanitizeString(msg.hdr.GetCommand()), pfrom->id); // Make sure we ban where that come from for some time. connman.Ban(pfrom->addr, BanReasonNodeMisbehaving); pfrom->fDisconnect = true; return false; } // Read header CMessageHeader &hdr = msg.hdr; if (!hdr.IsValid(config)) { LogPrintf("PROCESSMESSAGE: ERRORS IN HEADER %s peer=%d\n", SanitizeString(hdr.GetCommand()), pfrom->id); return fMoreWork; } std::string strCommand = hdr.GetCommand(); // Message size unsigned int nMessageSize = hdr.nMessageSize; // Checksum CDataStream &vRecv = msg.vRecv; const uint256 &hash = msg.GetMessageHash(); if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) { LogPrintf( "%s(%s, %u bytes): CHECKSUM ERROR expected %s was %s\n", __func__, SanitizeString(strCommand), nMessageSize, HexStr(hash.begin(), hash.begin() + CMessageHeader::CHECKSUM_SIZE), HexStr(hdr.pchChecksum, hdr.pchChecksum + CMessageHeader::CHECKSUM_SIZE)); return fMoreWork; } // Process message bool fRet = false; try { fRet = ProcessMessage(config, pfrom, strCommand, vRecv, msg.nTime, chainparams, connman, interruptMsgProc); if (interruptMsgProc) { return false; } if (!pfrom->vRecvGetData.empty()) { fMoreWork = true; } } catch (const std::ios_base::failure &e) { connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION) .Make(NetMsgType::REJECT, strCommand, REJECT_MALFORMED, std::string("error parsing message"))); if (strstr(e.what(), "end of data")) { // Allow exceptions from under-length message on vRecv LogPrintf( "%s(%s, %u bytes): Exception '%s' caught, normally caused by a " "message being shorter than its stated length\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); } else if (strstr(e.what(), "size too large")) { // Allow exceptions from over-long size LogPrintf("%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); } else if (strstr(e.what(), "non-canonical ReadCompactSize()")) { // Allow exceptions from non-canonical encoding LogPrintf("%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); } else { PrintExceptionContinue(&e, "ProcessMessages()"); } } catch (const std::exception &e) { PrintExceptionContinue(&e, "ProcessMessages()"); } catch (...) { PrintExceptionContinue(nullptr, "ProcessMessages()"); } if (!fRet) { LogPrintf("%s(%s, %u bytes) FAILED peer=%d\n", __func__, SanitizeString(strCommand), nMessageSize, pfrom->id); } LOCK(cs_main); SendRejectsAndCheckIfBanned(pfrom, connman); return fMoreWork; } class CompareInvMempoolOrder { CTxMemPool *mp; public: CompareInvMempoolOrder(CTxMemPool *_mempool) { mp = _mempool; } bool operator()(std::set::iterator a, std::set::iterator b) { /* As std::make_heap produces a max-heap, we want the entries with the * fewest ancestors/highest fee to sort later. */ return mp->CompareDepthAndScore(*b, *a); } }; bool SendMessages(const Config &config, CNode *pto, CConnman &connman, const std::atomic &interruptMsgProc) { const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); // Don't send anything until the version handshake is complete if (!pto->fSuccessfullyConnected || pto->fDisconnect) { return true; } // If we get here, the outgoing message serialization version is set and // can't change. const CNetMsgMaker msgMaker(pto->GetSendVersion()); // // Message: ping // bool pingSend = false; if (pto->fPingQueued) { // RPC ping request by user pingSend = true; } if (pto->nPingNonceSent == 0 && pto->nPingUsecStart + PING_INTERVAL * 1000000 < GetTimeMicros()) { // Ping automatically sent as a latency probe & keepalive. pingSend = true; } if (pingSend) { uint64_t nonce = 0; while (nonce == 0) { GetRandBytes((uint8_t *)&nonce, sizeof(nonce)); } pto->fPingQueued = false; pto->nPingUsecStart = GetTimeMicros(); if (pto->nVersion > BIP0031_VERSION) { pto->nPingNonceSent = nonce; connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING, nonce)); } else { // Peer is too old to support ping command with nonce, pong will // never arrive. pto->nPingNonceSent = 0; connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING)); } } // Acquire cs_main for IsInitialBlockDownload() and CNodeState() TRY_LOCK(cs_main, lockMain); if (!lockMain) { return true; } if (SendRejectsAndCheckIfBanned(pto, connman)) { return true; } CNodeState &state = *State(pto->GetId()); // Address refresh broadcast int64_t nNow = GetTimeMicros(); if (!IsInitialBlockDownload() && pto->nNextLocalAddrSend < nNow) { AdvertiseLocal(pto); pto->nNextLocalAddrSend = PoissonNextSend(nNow, AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL); } // // Message: addr // if (pto->nNextAddrSend < nNow) { pto->nNextAddrSend = PoissonNextSend(nNow, AVG_ADDRESS_BROADCAST_INTERVAL); std::vector vAddr; vAddr.reserve(pto->vAddrToSend.size()); for (const CAddress &addr : pto->vAddrToSend) { if (!pto->addrKnown.contains(addr.GetKey())) { pto->addrKnown.insert(addr.GetKey()); vAddr.push_back(addr); // receiver rejects addr messages larger than 1000 if (vAddr.size() >= 1000) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr)); vAddr.clear(); } } } pto->vAddrToSend.clear(); if (!vAddr.empty()) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr)); } // we only send the big addr message once if (pto->vAddrToSend.capacity() > 40) { pto->vAddrToSend.shrink_to_fit(); } } // Start block sync if (pindexBestHeader == nullptr) { pindexBestHeader = chainActive.Tip(); } // Download if this is a nice peer, or we have no nice peers and this one // might do. bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->fOneShot); if (!state.fSyncStarted && !pto->fClient && !fImporting && !fReindex) { // Only actively request headers from a single peer, unless we're close // to today. if ((nSyncStarted == 0 && fFetch) || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) { state.fSyncStarted = true; nSyncStarted++; const CBlockIndex *pindexStart = pindexBestHeader; /** * If possible, start at the block preceding the currently best * known header. This ensures that we always get a non-empty list of * headers back as long as the peer is up-to-date. With a non-empty * response, we can initialise the peer's known best block. This * wouldn't be possible if we requested starting at pindexBestHeader * and got back an empty response. */ if (pindexStart->pprev) { pindexStart = pindexStart->pprev; } LogPrint(BCLog::NET, "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->id, pto->nStartingHeight); connman.PushMessage( pto, msgMaker.Make(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexStart), uint256())); } } // Resend wallet transactions that haven't gotten in a block yet // Except during reindex, importing and IBD, when old wallet transactions // become unconfirmed and spams other nodes. if (!fReindex && !fImporting && !IsInitialBlockDownload()) { GetMainSignals().Broadcast(nTimeBestReceived, &connman); } // // Try sending block announcements via headers // { // If we have less than MAX_BLOCKS_TO_ANNOUNCE in our list of block // hashes we're relaying, and our peer wants headers announcements, then // find the first header not yet known to our peer but would connect, // and send. If no header would connect, or if we have too many blocks, // or if the peer doesn't want headers, just add all to the inv queue. LOCK(pto->cs_inventory); std::vector vHeaders; bool fRevertToInv = ((!state.fPreferHeaders && (!state.fPreferHeaderAndIDs || pto->vBlockHashesToAnnounce.size() > 1)) || pto->vBlockHashesToAnnounce.size() > MAX_BLOCKS_TO_ANNOUNCE); // last header queued for delivery const CBlockIndex *pBestIndex = nullptr; // ensure pindexBestKnownBlock is up-to-date ProcessBlockAvailability(pto->id); if (!fRevertToInv) { bool fFoundStartingHeader = false; // Try to find first header that our peer doesn't have, and then // send all headers past that one. If we come across an headers that // aren't on chainActive, give up. for (const uint256 &hash : pto->vBlockHashesToAnnounce) { BlockMap::iterator mi = mapBlockIndex.find(hash); assert(mi != mapBlockIndex.end()); const CBlockIndex *pindex = mi->second; if (chainActive[pindex->nHeight] != pindex) { // Bail out if we reorged away from this block fRevertToInv = true; break; } if (pBestIndex != nullptr && pindex->pprev != pBestIndex) { // This means that the list of blocks to announce don't // connect to each other. This shouldn't really be possible // to hit during regular operation (because reorgs should // take us to a chain that has some block not on the prior // chain, which should be caught by the prior check), but // one way this could happen is by using invalidateblock / // reconsiderblock repeatedly on the tip, causing it to be // added multiple times to vBlockHashesToAnnounce. Robustly // deal with this rare situation by reverting to an inv. fRevertToInv = true; break; } pBestIndex = pindex; if (fFoundStartingHeader) { // add this to the headers message vHeaders.push_back(pindex->GetBlockHeader()); } else if (PeerHasHeader(&state, pindex)) { // Keep looking for the first new block. continue; } else if (pindex->pprev == nullptr || PeerHasHeader(&state, pindex->pprev)) { // Peer doesn't have this header but they do have the prior // one. // Start sending headers. fFoundStartingHeader = true; vHeaders.push_back(pindex->GetBlockHeader()); } else { // Peer doesn't have this header or the prior one -- // nothing will connect, so bail out. fRevertToInv = true; break; } } } if (!fRevertToInv && !vHeaders.empty()) { if (vHeaders.size() == 1 && state.fPreferHeaderAndIDs) { // We only send up to 1 block as header-and-ids, as otherwise // probably means we're doing an initial-ish-sync or they're // slow. LogPrint(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", __func__, vHeaders.front().GetHash().ToString(), pto->id); int nSendFlags = 0; bool fGotBlockFromCache = false; { LOCK(cs_most_recent_block); if (most_recent_block_hash == pBestIndex->GetBlockHash()) { CBlockHeaderAndShortTxIDs cmpctblock( *most_recent_block); connman.PushMessage( pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); fGotBlockFromCache = true; } } if (!fGotBlockFromCache) { CBlock block; bool ret = ReadBlockFromDisk(block, pBestIndex, config); assert(ret); CBlockHeaderAndShortTxIDs cmpctblock(block); connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); } state.pindexBestHeaderSent = pBestIndex; } else if (state.fPreferHeaders) { if (vHeaders.size() > 1) { LogPrint(BCLog::NET, "%s: %u headers, range (%s, %s), to peer=%d\n", __func__, vHeaders.size(), vHeaders.front().GetHash().ToString(), vHeaders.back().GetHash().ToString(), pto->id); } else { LogPrint(BCLog::NET, "%s: sending header %s to peer=%d\n", __func__, vHeaders.front().GetHash().ToString(), pto->id); } connman.PushMessage( pto, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); state.pindexBestHeaderSent = pBestIndex; } else { fRevertToInv = true; } } if (fRevertToInv) { // If falling back to using an inv, just try to inv the tip. The // last entry in vBlockHashesToAnnounce was our tip at some point in // the past. if (!pto->vBlockHashesToAnnounce.empty()) { const uint256 &hashToAnnounce = pto->vBlockHashesToAnnounce.back(); BlockMap::iterator mi = mapBlockIndex.find(hashToAnnounce); assert(mi != mapBlockIndex.end()); const CBlockIndex *pindex = mi->second; // Warn if we're announcing a block that is not on the main // chain. This should be very rare and could be optimized out. // Just log for now. if (chainActive[pindex->nHeight] != pindex) { LogPrint(BCLog::NET, "Announcing block %s not on main chain (tip=%s)\n", hashToAnnounce.ToString(), chainActive.Tip()->GetBlockHash().ToString()); } // If the peer's chain has this block, don't inv it back. if (!PeerHasHeader(&state, pindex)) { pto->PushInventory(CInv(MSG_BLOCK, hashToAnnounce)); LogPrint(BCLog::NET, "%s: sending inv peer=%d hash=%s\n", __func__, pto->id, hashToAnnounce.ToString()); } } } pto->vBlockHashesToAnnounce.clear(); } // // Message: inventory // std::vector vInv; { LOCK(pto->cs_inventory); vInv.reserve(std::max(pto->vInventoryBlockToSend.size(), INVENTORY_BROADCAST_MAX)); // Add blocks for (const uint256 &hash : pto->vInventoryBlockToSend) { vInv.push_back(CInv(MSG_BLOCK, hash)); if (vInv.size() == MAX_INV_SZ) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } } pto->vInventoryBlockToSend.clear(); // Check whether periodic sends should happen bool fSendTrickle = pto->fWhitelisted; if (pto->nNextInvSend < nNow) { fSendTrickle = true; // Use half the delay for outbound peers, as there is less privacy // concern for them. pto->nNextInvSend = PoissonNextSend( nNow, INVENTORY_BROADCAST_INTERVAL >> !pto->fInbound); } // Time to send but the peer has requested we not relay transactions. if (fSendTrickle) { LOCK(pto->cs_filter); if (!pto->fRelayTxes) { pto->setInventoryTxToSend.clear(); } } // Respond to BIP35 mempool requests if (fSendTrickle && pto->fSendMempool) { auto vtxinfo = mempool.infoAll(); pto->fSendMempool = false; Amount filterrate(0); { LOCK(pto->cs_feeFilter); filterrate = pto->minFeeFilter; } LOCK(pto->cs_filter); for (const auto &txinfo : vtxinfo) { const uint256 &txid = txinfo.tx->GetId(); CInv inv(MSG_TX, txid); pto->setInventoryTxToSend.erase(txid); if (filterrate != Amount(0) && txinfo.feeRate.GetFeePerK() < filterrate) { continue; } if (pto->pfilter && !pto->pfilter->IsRelevantAndUpdate(*txinfo.tx)) { continue; } pto->filterInventoryKnown.insert(txid); vInv.push_back(inv); if (vInv.size() == MAX_INV_SZ) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } } pto->timeLastMempoolReq = GetTime(); } // Determine transactions to relay if (fSendTrickle) { // Produce a vector with all candidates for sending std::vector::iterator> vInvTx; vInvTx.reserve(pto->setInventoryTxToSend.size()); for (std::set::iterator it = pto->setInventoryTxToSend.begin(); it != pto->setInventoryTxToSend.end(); it++) { vInvTx.push_back(it); } Amount filterrate(0); { LOCK(pto->cs_feeFilter); filterrate = pto->minFeeFilter; } // Topologically and fee-rate sort the inventory we send for privacy // and priority reasons. A heap is used so that not all items need // sorting if only a few are being sent. CompareInvMempoolOrder compareInvMempoolOrder(&mempool); std::make_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder); // No reason to drain out at many times the network's capacity, // especially since we have many peers and some will draw much // shorter delays. unsigned int nRelayedTransactions = 0; LOCK(pto->cs_filter); while (!vInvTx.empty() && nRelayedTransactions < INVENTORY_BROADCAST_MAX) { // Fetch the top element from the heap std::pop_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder); std::set::iterator it = vInvTx.back(); vInvTx.pop_back(); uint256 hash = *it; // Remove it from the to-be-sent set pto->setInventoryTxToSend.erase(it); // Check if not in the filter already if (pto->filterInventoryKnown.contains(hash)) { continue; } // Not in the mempool anymore? don't bother sending it. auto txinfo = mempool.info(hash); if (!txinfo.tx) { continue; } if (filterrate != Amount(0) && txinfo.feeRate.GetFeePerK() < filterrate) { continue; } if (pto->pfilter && !pto->pfilter->IsRelevantAndUpdate(*txinfo.tx)) { continue; } // Send vInv.push_back(CInv(MSG_TX, hash)); nRelayedTransactions++; { // Expire old relay messages while (!vRelayExpiration.empty() && vRelayExpiration.front().first < nNow) { mapRelay.erase(vRelayExpiration.front().second); vRelayExpiration.pop_front(); } auto ret = mapRelay.insert( std::make_pair(hash, std::move(txinfo.tx))); if (ret.second) { vRelayExpiration.push_back(std::make_pair( nNow + 15 * 60 * 1000000, ret.first)); } } if (vInv.size() == MAX_INV_SZ) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } pto->filterInventoryKnown.insert(hash); } } } if (!vInv.empty()) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); } // Detect whether we're stalling nNow = GetTimeMicros(); if (state.nStallingSince && state.nStallingSince < nNow - 1000000 * BLOCK_STALLING_TIMEOUT) { // Stalling only triggers when the block download window cannot move. // During normal steady state, the download window should be much larger // than the to-be-downloaded set of blocks, so disconnection should only // happen during initial block download. LogPrintf("Peer=%d is stalling block download, disconnecting\n", pto->id); pto->fDisconnect = true; return true; } // In case there is a block that has been in flight from this peer for 2 + // 0.5 * N times the block interval (with N the number of peers from which // we're downloading validated blocks), disconnect due to timeout. We // compensate for other peers to prevent killing off peers due to our own // downstream link being saturated. We only count validated in-flight blocks // so peers can't advertise non-existing block hashes to unreasonably // increase our timeout. if (state.vBlocksInFlight.size() > 0) { QueuedBlock &queuedBlock = state.vBlocksInFlight.front(); int nOtherPeersWithValidatedDownloads = nPeersWithValidatedDownloads - (state.nBlocksInFlightValidHeaders > 0); if (nNow > state.nDownloadingSince + consensusParams.nPowTargetSpacing * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) { LogPrintf("Timeout downloading block %s from peer=%d, " "disconnecting\n", queuedBlock.hash.ToString(), pto->id); pto->fDisconnect = true; return true; } } // // Message: getdata (blocks) // std::vector vGetData; if (!pto->fClient && (fFetch || !IsInitialBlockDownload()) && state.nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) { std::vector vToDownload; NodeId staller = -1; FindNextBlocksToDownload(pto->GetId(), MAX_BLOCKS_IN_TRANSIT_PER_PEER - state.nBlocksInFlight, vToDownload, staller, consensusParams); for (const CBlockIndex *pindex : vToDownload) { vGetData.push_back(CInv(MSG_BLOCK, pindex->GetBlockHash())); MarkBlockAsInFlight(config, pto->GetId(), pindex->GetBlockHash(), consensusParams, pindex); LogPrint(BCLog::NET, "Requesting block %s (%d) peer=%d\n", pindex->GetBlockHash().ToString(), pindex->nHeight, pto->id); } if (state.nBlocksInFlight == 0 && staller != -1) { if (State(staller)->nStallingSince == 0) { State(staller)->nStallingSince = nNow; LogPrint(BCLog::NET, "Stall started peer=%d\n", staller); } } } // // Message: getdata (non-blocks) // while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow) { const CInv &inv = (*pto->mapAskFor.begin()).second; if (!AlreadyHave(inv)) { LogPrint(BCLog::NET, "Requesting %s peer=%d\n", inv.ToString(), pto->id); vGetData.push_back(inv); if (vGetData.size() >= 1000) { connman.PushMessage( pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); vGetData.clear(); } } else { // If we're not going to ask, don't expect a response. pto->setAskFor.erase(inv.hash); } pto->mapAskFor.erase(pto->mapAskFor.begin()); } if (!vGetData.empty()) { connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); } // // Message: feefilter // // We don't want white listed peers to filter txs to us if we have // -whitelistforcerelay if (pto->nVersion >= FEEFILTER_VERSION && gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) && !(pto->fWhitelisted && gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY))) { Amount currentFilter = mempool .GetMinFee( gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000) .GetFeePerK(); int64_t timeNow = GetTimeMicros(); if (timeNow > pto->nextSendTimeFeeFilter) { static CFeeRate default_feerate = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE); static FeeFilterRounder filterRounder(default_feerate); Amount filterToSend = filterRounder.round(currentFilter); // If we don't allow free transactions, then we always have a fee // filter of at least minRelayTxFee if (gArgs.GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) <= 0) { filterToSend = std::max(filterToSend, config.GetMinFeePerKB().GetFeePerK()); } if (filterToSend != pto->lastSentFeeFilter) { connman.PushMessage( pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend)); pto->lastSentFeeFilter = filterToSend; } pto->nextSendTimeFeeFilter = PoissonNextSend(timeNow, AVG_FEEFILTER_BROADCAST_INTERVAL); } // If the fee filter has changed substantially and it's still more than // MAX_FEEFILTER_CHANGE_DELAY until scheduled broadcast, then move the // broadcast to within MAX_FEEFILTER_CHANGE_DELAY. else if (timeNow + MAX_FEEFILTER_CHANGE_DELAY * 1000000 < pto->nextSendTimeFeeFilter && (currentFilter < 3 * pto->lastSentFeeFilter / 4 || currentFilter > 4 * pto->lastSentFeeFilter / 3)) { pto->nextSendTimeFeeFilter = timeNow + GetRandInt(MAX_FEEFILTER_CHANGE_DELAY) * 1000000; } } return true; } class CNetProcessingCleanup { public: CNetProcessingCleanup() {} ~CNetProcessingCleanup() { // orphan transactions mapOrphanTransactions.clear(); mapOrphanTransactionsByPrev.clear(); } } instance_of_cnetprocessingcleanup; diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp index 39f1ef92a..5461d6759 100644 --- a/src/rpc/mining.cpp +++ b/src/rpc/mining.cpp @@ -1,834 +1,835 @@ // Copyright (c) 2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include "rpc/mining.h" #include "amount.h" +#include "blockvalidity.h" #include "chain.h" #include "chainparams.h" #include "config.h" #include "consensus/consensus.h" #include "consensus/params.h" #include "consensus/validation.h" #include "core_io.h" #include "dstencode.h" #include "init.h" #include "miner.h" #include "net.h" #include "policy/policy.h" #include "pow.h" #include "rpc/blockchain.h" #include "rpc/server.h" #include "txmempool.h" #include "util.h" #include "utilstrencodings.h" #include "validation.h" #include "validationinterface.h" #include #include #include /** * Return average network hashes per second based on the last 'lookup' blocks, * or from the last difficulty change if 'lookup' is nonpositive. If 'height' is * nonnegative, compute the estimate at the time when a given block was found. */ static UniValue GetNetworkHashPS(int lookup, int height) { CBlockIndex *pb = chainActive.Tip(); if (height >= 0 && height < chainActive.Height()) { pb = chainActive[height]; } if (pb == nullptr || !pb->nHeight) { return 0; } // If lookup is -1, then use blocks since last difficulty change. if (lookup <= 0) { lookup = pb->nHeight % Params().GetConsensus().DifficultyAdjustmentInterval() + 1; } // If lookup is larger than chain, then set it to chain length. if (lookup > pb->nHeight) { lookup = pb->nHeight; } CBlockIndex *pb0 = pb; int64_t minTime = pb0->GetBlockTime(); int64_t maxTime = minTime; for (int i = 0; i < lookup; i++) { pb0 = pb0->pprev; int64_t time = pb0->GetBlockTime(); minTime = std::min(time, minTime); maxTime = std::max(time, maxTime); } // In case there's a situation where minTime == maxTime, we don't want a // divide by zero exception. if (minTime == maxTime) { return 0; } arith_uint256 workDiff = pb->nChainWork - pb0->nChainWork; int64_t timeDiff = maxTime - minTime; return workDiff.getdouble() / timeDiff; } static UniValue getnetworkhashps(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() > 2) { throw std::runtime_error( "getnetworkhashps ( nblocks height )\n" "\nReturns the estimated network hashes per second based on the " "last n blocks.\n" "Pass in [blocks] to override # of blocks, -1 specifies since last " "difficulty change.\n" "Pass in [height] to estimate the network speed at the time when a " "certain block was found.\n" "\nArguments:\n" "1. nblocks (numeric, optional, default=120) The number of " "blocks, or -1 for blocks since last difficulty change.\n" "2. height (numeric, optional, default=-1) To estimate at the " "time of the given height.\n" "\nResult:\n" "x (numeric) Hashes per second estimated\n" "\nExamples:\n" + HelpExampleCli("getnetworkhashps", "") + HelpExampleRpc("getnetworkhashps", "")); } LOCK(cs_main); return GetNetworkHashPS( request.params.size() > 0 ? request.params[0].get_int() : 120, request.params.size() > 1 ? request.params[1].get_int() : -1); } UniValue generateBlocks(const Config &config, std::shared_ptr coinbaseScript, int nGenerate, uint64_t nMaxTries, bool keepScript) { static const int nInnerLoopCount = 0x100000; int nHeightStart = 0; int nHeightEnd = 0; int nHeight = 0; { // Don't keep cs_main locked. LOCK(cs_main); nHeightStart = chainActive.Height(); nHeight = nHeightStart; nHeightEnd = nHeightStart + nGenerate; } unsigned int nExtraNonce = 0; UniValue blockHashes(UniValue::VARR); while (nHeight < nHeightEnd) { std::unique_ptr pblocktemplate( BlockAssembler(config).CreateNewBlock( coinbaseScript->reserveScript)); if (!pblocktemplate.get()) { throw JSONRPCError(RPC_INTERNAL_ERROR, "Couldn't create new block"); } CBlock *pblock = &pblocktemplate->block; { LOCK(cs_main); IncrementExtraNonce(config, pblock, chainActive.Tip(), nExtraNonce); } while (nMaxTries > 0 && pblock->nNonce < nInnerLoopCount && !CheckProofOfWork(pblock->GetHash(), pblock->nBits, config)) { ++pblock->nNonce; --nMaxTries; } if (nMaxTries == 0) { break; } if (pblock->nNonce == nInnerLoopCount) { continue; } std::shared_ptr shared_pblock = std::make_shared(*pblock); if (!ProcessNewBlock(config, shared_pblock, true, nullptr)) { throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted"); } ++nHeight; blockHashes.push_back(pblock->GetHash().GetHex()); // Mark script as important because it was used at least for one // coinbase output if the script came from the wallet. if (keepScript) { coinbaseScript->KeepScript(); } } return blockHashes; } static UniValue generatetoaddress(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() < 2 || request.params.size() > 3) { throw std::runtime_error( "generatetoaddress nblocks address (maxtries)\n" "\nMine blocks immediately to a specified address (before the RPC " "call returns)\n" "\nArguments:\n" "1. nblocks (numeric, required) How many blocks are generated " "immediately.\n" "2. address (string, required) The address to send the newly " "generated bitcoin to.\n" "3. maxtries (numeric, optional) How many iterations to try " "(default = 1000000).\n" "\nResult:\n" "[ blockhashes ] (array) hashes of blocks generated\n" "\nExamples:\n" "\nGenerate 11 blocks to myaddress\n" + HelpExampleCli("generatetoaddress", "11 \"myaddress\"")); } int nGenerate = request.params[0].get_int(); uint64_t nMaxTries = 1000000; if (request.params.size() > 2) { nMaxTries = request.params[2].get_int(); } CTxDestination destination = DecodeDestination(request.params[1].get_str(), config.GetChainParams()); if (!IsValidDestination(destination)) { throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Error: Invalid address"); } std::shared_ptr coinbaseScript = std::make_shared(); coinbaseScript->reserveScript = GetScriptForDestination(destination); return generateBlocks(config, coinbaseScript, nGenerate, nMaxTries, false); } static UniValue getmininginfo(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() != 0) { throw std::runtime_error( "getmininginfo\n" "\nReturns a json object containing mining-related information." "\nResult:\n" "{\n" " \"blocks\": nnn, (numeric) The current block\n" " \"currentblocksize\": nnn, (numeric) The last block size\n" " \"currentblocktx\": nnn, (numeric) The last block " "transaction\n" " \"difficulty\": xxx.xxxxx (numeric) The current difficulty\n" " \"errors\": \"...\" (string) Current errors\n" " \"networkhashps\": nnn, (numeric) The network hashes per " "second\n" " \"pooledtx\": n (numeric) The size of the mempool\n" " \"chain\": \"xxxx\", (string) current network name as " "defined in BIP70 (main, test, regtest)\n" "}\n" "\nExamples:\n" + HelpExampleCli("getmininginfo", "") + HelpExampleRpc("getmininginfo", "")); } LOCK(cs_main); UniValue obj(UniValue::VOBJ); obj.push_back(Pair("blocks", int(chainActive.Height()))); obj.push_back(Pair("currentblocksize", uint64_t(nLastBlockSize))); obj.push_back(Pair("currentblocktx", uint64_t(nLastBlockTx))); obj.push_back(Pair("difficulty", double(GetDifficulty(chainActive.Tip())))); obj.push_back( Pair("blockprioritypercentage", uint8_t(gArgs.GetArg("-blockprioritypercentage", DEFAULT_BLOCK_PRIORITY_PERCENTAGE)))); obj.push_back(Pair("errors", GetWarnings("statusbar"))); obj.push_back(Pair("networkhashps", getnetworkhashps(config, request))); obj.push_back(Pair("pooledtx", uint64_t(mempool.size()))); obj.push_back(Pair("chain", config.GetChainParams().NetworkIDString())); return obj; } // NOTE: Unlike wallet RPC (which use BCH values), mining RPCs follow GBT (BIP // 22) in using satoshi amounts static UniValue prioritisetransaction(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() != 3) { throw std::runtime_error( "prioritisetransaction \n" "Accepts the transaction into mined blocks at a higher (or lower) " "priority\n" "\nArguments:\n" "1. \"txid\" (string, required) The transaction id.\n" "2. priority_delta (numeric, required) The priority to add or " "subtract.\n" " The transaction selection algorithm considers " "the tx as it would have a higher priority.\n" " (priority of a transaction is calculated: " "coinage * value_in_satoshis / txsize) \n" "3. fee_delta (numeric, required) The fee value (in satoshis) " "to add (or subtract, if negative).\n" " The fee is not actually paid, only the " "algorithm for selecting transactions into a block\n" " considers the transaction as it would have paid " "a higher (or lower) fee.\n" "\nResult:\n" "true (boolean) Returns true\n" "\nExamples:\n" + HelpExampleCli("prioritisetransaction", "\"txid\" 0.0 10000") + HelpExampleRpc("prioritisetransaction", "\"txid\", 0.0, 10000")); } LOCK(cs_main); uint256 hash = ParseHashStr(request.params[0].get_str(), "txid"); Amount nAmount(request.params[2].get_int64()); mempool.PrioritiseTransaction(hash, request.params[0].get_str(), request.params[1].get_real(), nAmount); return true; } // NOTE: Assumes a conclusive result; if result is inconclusive, it must be // handled by caller static UniValue BIP22ValidationResult(const Config &config, const CValidationState &state) { if (state.IsValid()) { return NullUniValue; } std::string strRejectReason = state.GetRejectReason(); if (state.IsError()) { throw JSONRPCError(RPC_VERIFY_ERROR, strRejectReason); } if (state.IsInvalid()) { if (strRejectReason.empty()) { return "rejected"; } return strRejectReason; } // Should be impossible. return "valid?"; } static UniValue getblocktemplate(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() > 1) { throw std::runtime_error( "getblocktemplate ( TemplateRequest )\n" "\nIf the request parameters include a 'mode' key, that is used to " "explicitly select between the default 'template' request or a " "'proposal'.\n" "It returns data needed to construct a block to work on.\n" "For full specification, see BIPs 22, 23, 9, and 145:\n" " " "https://github.com/bitcoin/bips/blob/master/bip-0022.mediawiki\n" " " "https://github.com/bitcoin/bips/blob/master/bip-0023.mediawiki\n" " " "https://github.com/bitcoin/bips/blob/master/" "bip-0009.mediawiki#getblocktemplate_changes\n" " " "https://github.com/bitcoin/bips/blob/master/bip-0145.mediawiki\n" "\nArguments:\n" "1. template_request (json object, optional) A json object " "in the following spec\n" " {\n" " \"mode\":\"template\" (string, optional) This must be " "set to \"template\", \"proposal\" (see BIP 23), or omitted\n" " \"capabilities\":[ (array, optional) A list of " "strings\n" " \"support\" (string) client side supported " "feature, 'longpoll', 'coinbasetxn', 'coinbasevalue', 'proposal', " "'serverlist', 'workid'\n" " ,...\n" " ]\n" " }\n" "\n" "\nResult:\n" "{\n" " \"version\" : n, (numeric) The preferred " "block version\n" " \"previousblockhash\" : \"xxxx\", (string) The hash of " "current highest block\n" " \"transactions\" : [ (array) contents of " "non-coinbase transactions that should be included in the next " "block\n" " {\n" " \"data\" : \"xxxx\", (string) transaction " "data encoded in hexadecimal (byte-for-byte)\n" " \"txid\" : \"xxxx\", (string) transaction id " "encoded in little-endian hexadecimal\n" " \"hash\" : \"xxxx\", (string) hash encoded " "in little-endian hexadecimal (including witness data)\n" " \"depends\" : [ (array) array of numbers " "\n" " n (numeric) transactions " "before this one (by 1-based index in 'transactions' list) that " "must be present in the final block if this one is\n" " ,...\n" " ],\n" " \"fee\": n, (numeric) difference in " "value between transaction inputs and outputs (in Satoshis); for " "coinbase transactions, this is a negative Number of the total " "collected block fees (ie, not including the block subsidy); if " "key is not present, fee is unknown and clients MUST NOT assume " "there isn't one\n" " \"sigops\" : n, (numeric) total SigOps " "cost, as counted for purposes of block limits; if key is not " "present, sigop cost is unknown and clients MUST NOT assume it is " "zero\n" " \"required\" : true|false (boolean) if provided and " "true, this transaction must be in the final block\n" " }\n" " ,...\n" " ],\n" " \"coinbaseaux\" : { (json object) data that " "should be included in the coinbase's scriptSig content\n" " \"flags\" : \"xx\" (string) key name is to " "be ignored, and value included in scriptSig\n" " },\n" " \"coinbasevalue\" : n, (numeric) maximum allowable " "input to coinbase transaction, including the generation award and " "transaction fees (in Satoshis)\n" " \"coinbasetxn\" : { ... }, (json object) information " "for coinbase transaction\n" " \"target\" : \"xxxx\", (string) The hash target\n" " \"mintime\" : xxx, (numeric) The minimum " "timestamp appropriate for next block time in seconds since epoch " "(Jan 1 1970 GMT)\n" " \"mutable\" : [ (array of string) list of " "ways the block template may be changed \n" " \"value\" (string) A way the block " "template may be changed, e.g. 'time', 'transactions', " "'prevblock'\n" " ,...\n" " ],\n" " \"noncerange\" : \"00000000ffffffff\",(string) A range of valid " "nonces\n" " \"sigoplimit\" : n, (numeric) limit of sigops " "in blocks\n" " \"sizelimit\" : n, (numeric) limit of block " "size\n" " \"curtime\" : ttt, (numeric) current timestamp " "in seconds since epoch (Jan 1 1970 GMT)\n" " \"bits\" : \"xxxxxxxx\", (string) compressed " "target of next block\n" " \"height\" : n (numeric) The height of the " "next block\n" "}\n" "\nExamples:\n" + HelpExampleCli("getblocktemplate", "") + HelpExampleRpc("getblocktemplate", "")); } LOCK(cs_main); std::string strMode = "template"; UniValue lpval = NullUniValue; std::set setClientRules; if (request.params.size() > 0) { const UniValue &oparam = request.params[0].get_obj(); const UniValue &modeval = find_value(oparam, "mode"); if (modeval.isStr()) { strMode = modeval.get_str(); } else if (modeval.isNull()) { /* Do nothing */ } else { throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode"); } lpval = find_value(oparam, "longpollid"); if (strMode == "proposal") { const UniValue &dataval = find_value(oparam, "data"); if (!dataval.isStr()) { throw JSONRPCError(RPC_TYPE_ERROR, "Missing data String key for proposal"); } CBlock block; if (!DecodeHexBlk(block, dataval.get_str())) { throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed"); } uint256 hash = block.GetHash(); BlockMap::iterator mi = mapBlockIndex.find(hash); if (mi != mapBlockIndex.end()) { CBlockIndex *pindex = mi->second; if (pindex->IsValid(BlockValidity::SCRIPTS)) { return "duplicate"; } if (pindex->nStatus.isInvalid()) { return "duplicate-invalid"; } return "duplicate-inconclusive"; } CBlockIndex *const pindexPrev = chainActive.Tip(); // TestBlockValidity only supports blocks built on the current Tip if (block.hashPrevBlock != pindexPrev->GetBlockHash()) { return "inconclusive-not-best-prevblk"; } CValidationState state; BlockValidationOptions validationOptions = BlockValidationOptions(false, true); TestBlockValidity(config, state, block, pindexPrev, validationOptions); return BIP22ValidationResult(config, state); } } if (strMode != "template") { throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode"); } if (!g_connman) { throw JSONRPCError( RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled"); } if (g_connman->GetNodeCount(CConnman::CONNECTIONS_ALL) == 0) { throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Bitcoin is not connected!"); } if (IsInitialBlockDownload()) { throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Bitcoin is downloading blocks..."); } static unsigned int nTransactionsUpdatedLast; if (!lpval.isNull()) { // Wait to respond until either the best block changes, OR a minute has // passed and there are more transactions uint256 hashWatchedChain; boost::system_time checktxtime; unsigned int nTransactionsUpdatedLastLP; if (lpval.isStr()) { // Format: std::string lpstr = lpval.get_str(); hashWatchedChain.SetHex(lpstr.substr(0, 64)); nTransactionsUpdatedLastLP = atoi64(lpstr.substr(64)); } else { // NOTE: Spec does not specify behaviour for non-string longpollid, // but this makes testing easier hashWatchedChain = chainActive.Tip()->GetBlockHash(); nTransactionsUpdatedLastLP = nTransactionsUpdatedLast; } // Release the wallet and main lock while waiting LEAVE_CRITICAL_SECTION(cs_main); { checktxtime = boost::get_system_time() + boost::posix_time::minutes(1); boost::unique_lock lock(csBestBlock); while (chainActive.Tip()->GetBlockHash() == hashWatchedChain && IsRPCRunning()) { if (!cvBlockChange.timed_wait(lock, checktxtime)) { // Timeout: Check transactions for update if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLastLP) { break; } checktxtime += boost::posix_time::seconds(10); } } } ENTER_CRITICAL_SECTION(cs_main); if (!IsRPCRunning()) { throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Shutting down"); } // TODO: Maybe recheck connections/IBD and (if something wrong) send an // expires-immediately template to stop miners? } // Update block static CBlockIndex *pindexPrev; static int64_t nStart; static std::unique_ptr pblocktemplate; if (pindexPrev != chainActive.Tip() || (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5)) { // Clear pindexPrev so future calls make a new block, despite any // failures from here on pindexPrev = nullptr; // Store the pindexBest used before CreateNewBlock, to avoid races nTransactionsUpdatedLast = mempool.GetTransactionsUpdated(); CBlockIndex *pindexPrevNew = chainActive.Tip(); nStart = GetTime(); // Create new block CScript scriptDummy = CScript() << OP_TRUE; pblocktemplate = BlockAssembler(config).CreateNewBlock(scriptDummy); if (!pblocktemplate) { throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory"); } // Need to update only after we know CreateNewBlock succeeded pindexPrev = pindexPrevNew; } // pointer for convenience CBlock *pblock = &pblocktemplate->block; // Update nTime UpdateTime(pblock, config, pindexPrev); pblock->nNonce = 0; UniValue aCaps(UniValue::VARR); aCaps.push_back("proposal"); UniValue transactions(UniValue::VARR); std::map setTxIndex; int i = 0; for (const auto &it : pblock->vtx) { const CTransaction &tx = *it; uint256 txId = tx.GetId(); setTxIndex[txId] = i++; if (tx.IsCoinBase()) { continue; } UniValue entry(UniValue::VOBJ); entry.push_back(Pair("data", EncodeHexTx(tx))); entry.push_back(Pair("txid", txId.GetHex())); entry.push_back(Pair("hash", tx.GetHash().GetHex())); UniValue deps(UniValue::VARR); for (const CTxIn &in : tx.vin) { if (setTxIndex.count(in.prevout.GetTxId())) { deps.push_back(setTxIndex[in.prevout.GetTxId()]); } } entry.push_back(Pair("depends", deps)); int index_in_template = i - 1; entry.push_back( Pair("fee", pblocktemplate->vTxFees[index_in_template] / SATOSHI)); int64_t nTxSigOps = pblocktemplate->vTxSigOpsCount[index_in_template]; entry.push_back(Pair("sigops", nTxSigOps)); transactions.push_back(entry); } UniValue aux(UniValue::VOBJ); aux.push_back( Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end()))); arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits); UniValue aMutable(UniValue::VARR); aMutable.push_back("time"); aMutable.push_back("transactions"); aMutable.push_back("prevblock"); UniValue result(UniValue::VOBJ); result.push_back(Pair("capabilities", aCaps)); result.push_back(Pair("version", pblock->nVersion)); result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex())); result.push_back(Pair("transactions", transactions)); result.push_back(Pair("coinbaseaux", aux)); result.push_back(Pair("coinbasevalue", int64_t(pblock->vtx[0]->vout[0].nValue / SATOSHI))); result.push_back(Pair("longpollid", chainActive.Tip()->GetBlockHash().GetHex() + i64tostr(nTransactionsUpdatedLast))); result.push_back(Pair("target", hashTarget.GetHex())); result.push_back( Pair("mintime", int64_t(pindexPrev->GetMedianTimePast()) + 1)); result.push_back(Pair("mutable", aMutable)); result.push_back(Pair("noncerange", "00000000ffffffff")); // FIXME: Allow for mining block greater than 1M. result.push_back( Pair("sigoplimit", GetMaxBlockSigOpsCount(DEFAULT_MAX_BLOCK_SIZE))); result.push_back(Pair("sizelimit", DEFAULT_MAX_BLOCK_SIZE)); result.push_back(Pair("curtime", pblock->GetBlockTime())); result.push_back(Pair("bits", strprintf("%08x", pblock->nBits))); result.push_back(Pair("height", int64_t(pindexPrev->nHeight) + 1)); return result; } class submitblock_StateCatcher : public CValidationInterface { public: uint256 hash; bool found; CValidationState state; submitblock_StateCatcher(const uint256 &hashIn) : hash(hashIn), found(false), state() {} protected: void BlockChecked(const CBlock &block, const CValidationState &stateIn) override { if (block.GetHash() != hash) { return; } found = true; state = stateIn; } }; static UniValue submitblock(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) { throw std::runtime_error( "submitblock \"hexdata\" ( \"jsonparametersobject\" )\n" "\nAttempts to submit new block to network.\n" "The 'jsonparametersobject' parameter is currently ignored.\n" "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.\n" "\nArguments\n" "1. \"hexdata\" (string, required) the hex-encoded block " "data to submit\n" "2. \"parameters\" (string, optional) object of optional " "parameters\n" " {\n" " \"workid\" : \"id\" (string, optional) if the server " "provided a workid, it MUST be included with submissions\n" " }\n" "\nResult:\n" "\nExamples:\n" + HelpExampleCli("submitblock", "\"mydata\"") + HelpExampleRpc("submitblock", "\"mydata\"")); } std::shared_ptr blockptr = std::make_shared(); CBlock &block = *blockptr; if (!DecodeHexBlk(block, request.params[0].get_str())) { throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed"); } if (block.vtx.empty() || !block.vtx[0]->IsCoinBase()) { throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block does not start with a coinbase"); } uint256 hash = block.GetHash(); bool fBlockPresent = false; { LOCK(cs_main); BlockMap::iterator mi = mapBlockIndex.find(hash); if (mi != mapBlockIndex.end()) { CBlockIndex *pindex = mi->second; if (pindex->IsValid(BlockValidity::SCRIPTS)) { return "duplicate"; } if (pindex->nStatus.isInvalid()) { return "duplicate-invalid"; } // Otherwise, we might only have the header - process the block // before returning fBlockPresent = true; } } submitblock_StateCatcher sc(block.GetHash()); RegisterValidationInterface(&sc); bool fAccepted = ProcessNewBlock(config, blockptr, true, nullptr); UnregisterValidationInterface(&sc); if (fBlockPresent) { if (fAccepted && !sc.found) { return "duplicate-inconclusive"; } return "duplicate"; } if (!sc.found) { return "inconclusive"; } return BIP22ValidationResult(config, sc.state); } static UniValue estimatefee(const Config &config, const JSONRPCRequest &request) { if (request.fHelp || request.params.size() != 1) { throw std::runtime_error( "estimatefee nblocks\n" "\nEstimates the approximate fee per kilobyte needed for a " "transaction to begin\n" "confirmation within nblocks blocks.\n" "\nArguments:\n" "1. nblocks (numeric, required)\n" "\nResult:\n" "n (numeric) estimated fee-per-kilobyte\n" "\n" "A negative value is returned if not enough transactions and " "blocks\n" "have been observed to make an estimate.\n" "-1 is always returned for nblocks == 1 as it is impossible to " "calculate\n" "a fee that is high enough to get reliably included in the next " "block.\n" "\nExample:\n" + HelpExampleCli("estimatefee", "6")); } RPCTypeCheck(request.params, {UniValue::VNUM}); int nBlocks = request.params[0].get_int(); if (nBlocks < 1) { nBlocks = 1; } CFeeRate feeRate = mempool.estimateFee(nBlocks); if (feeRate == CFeeRate(Amount(0))) { return -1.0; } return ValueFromAmount(feeRate.GetFeePerK()); } // clang-format off static const ContextFreeRPCCommand commands[] = { // category name actor (function) okSafeMode // ---------- ------------------------ ---------------------- ---------- {"mining", "getnetworkhashps", getnetworkhashps, true, {"nblocks", "height"}}, {"mining", "getmininginfo", getmininginfo, true, {}}, {"mining", "prioritisetransaction", prioritisetransaction, true, {"txid", "priority_delta", "fee_delta"}}, {"mining", "getblocktemplate", getblocktemplate, true, {"template_request"}}, {"mining", "submitblock", submitblock, true, {"hexdata", "parameters"}}, {"generating", "generatetoaddress", generatetoaddress, true, {"nblocks", "address", "maxtries"}}, {"util", "estimatefee", estimatefee, true, {"nblocks"}}, }; // clang-format on void RegisterMiningRPCCommands(CRPCTable &t) { for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++) t.appendCommand(commands[vcidx].name, &commands[vcidx]); } diff --git a/src/test/blockindex_tests.cpp b/src/test/blockindex_tests.cpp index f6673cb21..2fa93f518 100644 --- a/src/test/blockindex_tests.cpp +++ b/src/test/blockindex_tests.cpp @@ -1,222 +1,223 @@ // Copyright (c) 2018 The Bitcoin developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. +#include "blockvalidity.h" #include "chain.h" #include "diskblockpos.h" #include "uint256.h" #include "test/test_bitcoin.h" #include #include BOOST_FIXTURE_TEST_SUITE(blockindex_tests, BasicTestingSetup) BOOST_AUTO_TEST_CASE(get_block_header) { const int32_t expectedVersion = 4; const uint256 expectedMerkleRoot = uint256(); const uint32_t expectedBlockTime = 123; const uint32_t expectedDifficultyBits = 234; const uint32_t expectedNonce = 345; CBlockHeader header; header.nVersion = expectedVersion; header.hashMerkleRoot = expectedMerkleRoot; header.nTime = expectedBlockTime; header.nBits = expectedDifficultyBits; header.nNonce = expectedNonce; CBlockIndex index = CBlockIndex(header); CBlockHeader checkHeader = index.GetBlockHeader(); BOOST_CHECK(checkHeader.nVersion == expectedVersion); BOOST_CHECK(checkHeader.hashMerkleRoot == expectedMerkleRoot); BOOST_CHECK(checkHeader.nTime == expectedBlockTime); BOOST_CHECK(checkHeader.nBits == expectedDifficultyBits); BOOST_CHECK(checkHeader.nNonce == expectedNonce); } BOOST_AUTO_TEST_CASE(get_disk_positions) { // Test against all validity values std::set validityValues{ BlockValidity::UNKNOWN, BlockValidity::HEADER, BlockValidity::TREE, BlockValidity::TRANSACTIONS, BlockValidity::CHAIN, BlockValidity::SCRIPTS}; for (BlockValidity validity : validityValues) { // Test against all combinations of data and undo flags for (int flags = 0; flags <= 0x03; flags++) { // Generate some values to test against const int expectedFile = flags * 123; const unsigned int expectedDataPosition = flags * 234; const unsigned int expectedUndoPosition = flags * 345; CBlockIndex index; index.nStatus = index.nStatus.withValidity(BlockValidity(validity)); // All combinations of data and undo if (flags & 0x01) { index.nStatus = index.nStatus.withData(); index.nFile = expectedFile; index.nDataPos = expectedDataPosition; } if (flags & 0x02) { index.nStatus = index.nStatus.withUndo(); index.nFile = expectedFile; index.nUndoPos = expectedUndoPosition; } // Data and undo positions should be unmodified CDiskBlockPos dataPosition = index.GetBlockPos(); if (flags & 0x01) { BOOST_CHECK(dataPosition.nFile == expectedFile); BOOST_CHECK(dataPosition.nPos == expectedDataPosition); } else { BOOST_CHECK(dataPosition == CDiskBlockPos()); } CDiskBlockPos undoPosition = index.GetUndoPos(); if (flags & 0x02) { BOOST_CHECK(undoPosition.nFile == expectedFile); BOOST_CHECK(undoPosition.nPos == expectedUndoPosition); } else { BOOST_CHECK(undoPosition == CDiskBlockPos()); } } } } BOOST_AUTO_TEST_CASE(received_time) { // Set to UINT32_MAX because that's the maximum value header.nTime can hold const int64_t expectedBlockTime = std::numeric_limits::max(); CBlockHeader header; header.nTime = uint32_t(expectedBlockTime); CBlockIndex index = CBlockIndex(header); // nTimeReceived defaults to block time BOOST_CHECK(index.nTimeReceived == expectedBlockTime); // nTimeReceived can be updated to the actual received time, which may // be before or after the miner's time. for (int64_t receivedTime = expectedBlockTime - 10; // Make sure that receivedTime is tested beyond 32-bit values. receivedTime <= expectedBlockTime + 10; receivedTime++) { index.nTimeReceived = receivedTime; BOOST_CHECK(index.GetBlockTime() == expectedBlockTime); BOOST_CHECK(index.GetHeaderReceivedTime() == receivedTime); BOOST_CHECK(index.GetReceivedTimeDiff() == receivedTime - expectedBlockTime); } } BOOST_AUTO_TEST_CASE(median_time_past) { std::array indices; // times in this test are pairs of // Check that MTP is correctly calculated for all cases when block times // are consecutive and greater than previous block times: // 1) All cases where the number of blocks is < 11 // 2) The case where the number of blocks is exactly 11 // 3) The case where the number of blocks is > 11 (but only 11 are used to // calculate MTP. std::array, 12> times = {{{0, 0}, {1, 1}, {2, 1}, {4, 2}, {4, 2}, {5, 4}, {7, 4}, {10, 4}, {12, 4}, {14, 5}, {17, 5}, {20, 7}}}; for (size_t i = 0; i < indices.size(); i++) { indices[i].nTime = times[i].first; if (i > 0) { indices[i].pprev = &indices[i - 1]; } BOOST_CHECK(indices[i].GetMedianTimePast() == times[i].second); } // Test against non-consecutive block times std::array, 12> times2 = {{{0, 0}, {0, 0}, {1, 0}, {3, 1}, {2, 1}, {3, 2}, {4, 2}, {5, 3}, {6, 3}, {7, 3}, {8, 3}, {9, 4}}}; for (size_t i = 0; i < indices.size(); i++) { indices[i].nTime = times2[i].first; BOOST_CHECK(indices[i].GetMedianTimePast() == times2[i].second); } } BOOST_AUTO_TEST_CASE(index_validity_tests) { CBlockIndex index; // Test against all validity values std::set validityValues{ BlockValidity::UNKNOWN, BlockValidity::HEADER, BlockValidity::TREE, BlockValidity::TRANSACTIONS, BlockValidity::CHAIN, BlockValidity::SCRIPTS}; std::set boolValues = {false, true}; for (BlockValidity validity : validityValues) { for (bool withFailed : boolValues) { for (bool withFailedParent : boolValues) { index.nStatus = BlockStatus() .withValidity(validity) .withFailed(withFailed) .withFailedParent(withFailedParent); for (BlockValidity validUpTo : validityValues) { // Test isValidity() bool isValid = index.IsValid(validUpTo); if (validUpTo <= validity && !withFailed && !withFailedParent) { BOOST_CHECK(isValid); } else { BOOST_CHECK(!isValid); } // Test RaiseValidity() CBlockIndex indexRaiseValidity; for (BlockValidity validFrom : validityValues) { indexRaiseValidity.nStatus = BlockStatus() .withValidity(validFrom) .withFailed(withFailed) .withFailedParent(withFailedParent); bool raisedValidity = indexRaiseValidity.RaiseValidity(validUpTo); if (validFrom < validUpTo && !withFailed && !withFailedParent) { BOOST_CHECK(raisedValidity); BOOST_CHECK( indexRaiseValidity.nStatus.getValidity() == validUpTo); } else { BOOST_CHECK(!raisedValidity); BOOST_CHECK( indexRaiseValidity.nStatus.getValidity() == validFrom); } } } } } } } BOOST_AUTO_TEST_SUITE_END() diff --git a/src/test/blockstatus_tests.cpp b/src/test/blockstatus_tests.cpp index 04da04578..5b1fcc78f 100644 --- a/src/test/blockstatus_tests.cpp +++ b/src/test/blockstatus_tests.cpp @@ -1,131 +1,132 @@ // Copyright (c) 2018 The Bitcoin developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. +#include "blockvalidity.h" #include "chain.h" #include "test/test_bitcoin.h" #include #include BOOST_FIXTURE_TEST_SUITE(blockstatus_tests, BasicTestingSetup) static void CheckBlockStatus(const BlockStatus s, BlockValidity validity, bool hasData, bool hasUndo, bool hasFailed, bool hasFailedParent, bool isParked, bool hasParkedParent) { BOOST_CHECK(s.getValidity() == validity); BOOST_CHECK_EQUAL(s.hasData(), hasData); BOOST_CHECK_EQUAL(s.hasUndo(), hasUndo); BOOST_CHECK_EQUAL(s.hasFailed(), hasFailed); BOOST_CHECK_EQUAL(s.hasFailedParent(), hasFailedParent); BOOST_CHECK_EQUAL(s.isInvalid(), hasFailed || hasFailedParent); BOOST_CHECK_EQUAL(s.isParked(), isParked); BOOST_CHECK_EQUAL(s.hasParkedParent(), hasParkedParent); BOOST_CHECK_EQUAL(s.isOnParkedChain(), isParked || hasParkedParent); } static void CheckAllPermutations(const BlockStatus base, bool hasData, bool hasUndo, bool hasFailed, bool hasFailedParent, bool isParked, bool hasParkedParent) { // Check all possible permutations. std::set baseValidities{ BlockValidity::UNKNOWN, BlockValidity::HEADER, BlockValidity::TREE, BlockValidity::TRANSACTIONS, BlockValidity::CHAIN, BlockValidity::SCRIPTS}; for (BlockValidity validity : baseValidities) { const BlockStatus s = base.withValidity(validity); CheckBlockStatus(s, validity, hasData, hasUndo, hasFailed, hasFailedParent, isParked, hasParkedParent); // Clears failure flags. CheckBlockStatus(s.withClearedFailureFlags(), validity, hasData, hasUndo, false, false, isParked, hasParkedParent); // Also check all possible alterations. CheckBlockStatus(s.withData(true), validity, true, hasUndo, hasFailed, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withData(false), validity, false, hasUndo, hasFailed, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withUndo(true), validity, hasData, true, hasFailed, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withUndo(false), validity, hasData, false, hasFailed, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withFailed(true), validity, hasData, hasUndo, true, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withFailed(false), validity, hasData, hasUndo, false, hasFailedParent, isParked, hasParkedParent); CheckBlockStatus(s.withFailedParent(true), validity, hasData, hasUndo, hasFailed, true, isParked, hasParkedParent); CheckBlockStatus(s.withFailedParent(false), validity, hasData, hasUndo, hasFailed, false, isParked, hasParkedParent); CheckBlockStatus(s.withParked(true), validity, hasData, hasUndo, hasFailed, hasFailedParent, true, hasParkedParent); CheckBlockStatus(s.withParked(false), validity, hasData, hasUndo, hasFailed, hasFailedParent, false, hasParkedParent); CheckBlockStatus(s.withParkedParent(true), validity, hasData, hasUndo, hasFailed, hasFailedParent, isParked, true); CheckBlockStatus(s.withParkedParent(false), validity, hasData, hasUndo, hasFailed, hasFailedParent, isParked, false); for (BlockValidity newValidity : baseValidities) { CheckBlockStatus(s.withValidity(newValidity), newValidity, hasData, hasUndo, hasFailed, hasFailedParent, isParked, hasParkedParent); } } } static void CheckParked(const BlockStatus s, bool hasData, bool hasUndo, bool hasFailed, bool hasFailedParent) { std::set isParkedValues{false, true}; std::set hasParkedParentValues{false, true}; for (bool isParked : isParkedValues) { for (bool hasParkedParent : hasParkedParentValues) { CheckAllPermutations( s.withParked(isParked).withParkedParent(hasParkedParent), hasData, hasUndo, hasFailed, hasFailedParent, isParked, hasParkedParent); } } } static void CheckFailures(const BlockStatus s, bool hasData, bool hasUndo) { std::set hasFailedValues{false, true}; std::set hasFailedParentValues{false, true}; for (bool hasFailed : hasFailedValues) { for (bool hasFailedParent : hasFailedParentValues) { CheckParked( s.withFailed(hasFailed).withFailedParent(hasFailedParent), hasData, hasUndo, hasFailed, hasFailedParent); } } } static void CheckHaveDataAndUndo(const BlockStatus s) { std::set hasDataValues{false, true}; std::set hasUndoValues{false, true}; for (bool hasData : hasDataValues) { for (bool hasUndo : hasUndoValues) { CheckFailures(s.withData(hasData).withUndo(hasUndo), hasData, hasUndo); } } } BOOST_AUTO_TEST_CASE(sighash_construction_test) { // Check default values. CheckBlockStatus(BlockStatus(), BlockValidity::UNKNOWN, false, false, false, false, false, false); CheckHaveDataAndUndo(BlockStatus()); } BOOST_AUTO_TEST_SUITE_END() diff --git a/src/validation.cpp b/src/validation.cpp index 387100714..bee248da8 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -1,5499 +1,5500 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers // Copyright (c) 2017-2018 The Bitcoin developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include "validation.h" #include "arith_uint256.h" #include "blockindexworkcomparator.h" +#include "blockvalidity.h" #include "chainparams.h" #include "checkpoints.h" #include "checkqueue.h" #include "config.h" #include "consensus/consensus.h" #include "consensus/merkle.h" #include "consensus/validation.h" #include "fs.h" #include "hash.h" #include "init.h" #include "policy/fees.h" #include "policy/policy.h" #include "pow.h" #include "primitives/block.h" #include "primitives/transaction.h" #include "random.h" #include "script/script.h" #include "script/scriptcache.h" #include "script/sigcache.h" #include "script/standard.h" #include "timedata.h" #include "tinyformat.h" #include "txdb.h" #include "txmempool.h" #include "ui_interface.h" #include "undo.h" #include "util.h" #include "utilmoneystr.h" #include "utilstrencodings.h" #include "validationinterface.h" #include "warnings.h" #include #include #include #include #include #include #include #include #if defined(NDEBUG) #error "Bitcoin cannot be compiled without assertions." #endif /** * Global state */ CCriticalSection cs_main; BlockMap mapBlockIndex; CChain chainActive; CBlockIndex *pindexBestHeader = nullptr; CWaitableCriticalSection csBestBlock; CConditionVariable cvBlockChange; int nScriptCheckThreads = 0; std::atomic_bool fImporting(false); bool fReindex = false; bool fTxIndex = false; bool fHavePruned = false; bool fPruneMode = false; bool fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG; bool fRequireStandard = true; bool fCheckBlockIndex = false; bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED; size_t nCoinCacheUsage = 5000 * 300; uint64_t nPruneTarget = 0; int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE; uint256 hashAssumeValid; arith_uint256 nMinimumChainWork; Amount maxTxFee = DEFAULT_TRANSACTION_MAXFEE; CTxMemPool mempool; static void CheckBlockIndex(const Consensus::Params &consensusParams); /** Constant stuff for coinbase transactions we create: */ CScript COINBASE_FLAGS; const std::string strMessageMagic = "Bitcoin Signed Message:\n"; // Internal stuff namespace { CBlockIndex *pindexBestInvalid; /** * The set of all CBlockIndex entries with BLOCK_VALID_TRANSACTIONS (for itself * and all ancestors) and as good as our current tip or better. Entries may be * failed, though, and pruning nodes may be missing the data for the block. */ std::set setBlockIndexCandidates; /** * All pairs A->B, where A (or one of its ancestors) misses transactions, but B * has transactions. Pruned nodes may have entries where B is missing data. */ std::multimap mapBlocksUnlinked; CCriticalSection cs_LastBlockFile; std::vector vinfoBlockFile; int nLastBlockFile = 0; /** * Global flag to indicate we should check to see if there are block/undo files * that should be deleted. Set on startup or if we allocate more file space when * we're in prune mode. */ bool fCheckForPruning = false; /** * Every received block is assigned a unique and increasing identifier, so we * know which one to give priority in case of a fork. */ CCriticalSection cs_nBlockSequenceId; /** Blocks loaded from disk are assigned id 0, so start the counter at 1. */ int32_t nBlockSequenceId = 1; /** Decreasing counter (used by subsequent preciousblock calls). */ int32_t nBlockReverseSequenceId = -1; /** chainwork for the last block that preciousblock has been applied to. */ arith_uint256 nLastPreciousChainwork = 0; /** Dirty block index entries. */ std::set setDirtyBlockIndex; /** Dirty block file entries. */ std::set setDirtyFileInfo; } // namespace CBlockIndex *FindForkInGlobalIndex(const CChain &chain, const CBlockLocator &locator) { // Find the first block the caller has in the main chain for (const uint256 &hash : locator.vHave) { BlockMap::iterator mi = mapBlockIndex.find(hash); if (mi != mapBlockIndex.end()) { CBlockIndex *pindex = (*mi).second; if (chain.Contains(pindex)) { return pindex; } if (pindex->GetAncestor(chain.Height()) == chain.Tip()) { return chain.Tip(); } } } return chain.Genesis(); } CCoinsViewCache *pcoinsTip = nullptr; CBlockTreeDB *pblocktree = nullptr; enum FlushStateMode { FLUSH_STATE_NONE, FLUSH_STATE_IF_NEEDED, FLUSH_STATE_PERIODIC, FLUSH_STATE_ALWAYS }; // See definition for documentation static bool FlushStateToDisk(const CChainParams &chainParams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight = 0); static void FindFilesToPruneManual(std::set &setFilesToPrune, int nManualPruneHeight); static void FindFilesToPrune(std::set &setFilesToPrune, uint64_t nPruneAfterHeight); static FILE *OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false); static uint32_t GetBlockScriptFlags(const Config &config, const CBlockIndex *pChainTip); static bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime) { if (tx.nLockTime == 0) { return true; } int64_t lockTime = tx.nLockTime; int64_t lockTimeLimit = (lockTime < LOCKTIME_THRESHOLD) ? nBlockHeight : nBlockTime; if (lockTime < lockTimeLimit) { return true; } for (const auto &txin : tx.vin) { if (txin.nSequence != CTxIn::SEQUENCE_FINAL) { return false; } } return true; } /** * Calculates the block height and previous block's median time past at * which the transaction will be considered final in the context of BIP 68. * Also removes from the vector of input heights any entries which did not * correspond to sequence locked inputs as they do not affect the calculation. */ static std::pair CalculateSequenceLocks(const CTransaction &tx, int flags, std::vector *prevHeights, const CBlockIndex &block) { assert(prevHeights->size() == tx.vin.size()); // Will be set to the equivalent height- and time-based nLockTime // values that would be necessary to satisfy all relative lock- // time constraints given our view of block chain history. // The semantics of nLockTime are the last invalid height/time, so // use -1 to have the effect of any height or time being valid. int nMinHeight = -1; int64_t nMinTime = -1; // tx.nVersion is signed integer so requires cast to unsigned otherwise // we would be doing a signed comparison and half the range of nVersion // wouldn't support BIP 68. bool fEnforceBIP68 = static_cast(tx.nVersion) >= 2 && flags & LOCKTIME_VERIFY_SEQUENCE; // Do not enforce sequence numbers as a relative lock time // unless we have been instructed to if (!fEnforceBIP68) { return std::make_pair(nMinHeight, nMinTime); } for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) { const CTxIn &txin = tx.vin[txinIndex]; // Sequence numbers with the most significant bit set are not // treated as relative lock-times, nor are they given any // consensus-enforced meaning at this point. if (txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) { // The height of this input is not relevant for sequence locks (*prevHeights)[txinIndex] = 0; continue; } int nCoinHeight = (*prevHeights)[txinIndex]; if (txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG) { int64_t nCoinTime = block.GetAncestor(std::max(nCoinHeight - 1, 0)) ->GetMedianTimePast(); // NOTE: Subtract 1 to maintain nLockTime semantics. // BIP 68 relative lock times have the semantics of calculating the // first block or time at which the transaction would be valid. When // calculating the effective block time or height for the entire // transaction, we switch to using the semantics of nLockTime which // is the last invalid block time or height. Thus we subtract 1 from // the calculated time or height. // Time-based relative lock-times are measured from the smallest // allowed timestamp of the block containing the txout being spent, // which is the median time past of the block prior. nMinTime = std::max( nMinTime, nCoinTime + (int64_t)((txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_MASK) << CTxIn::SEQUENCE_LOCKTIME_GRANULARITY) - 1); } else { nMinHeight = std::max( nMinHeight, nCoinHeight + (int)(txin.nSequence & CTxIn::SEQUENCE_LOCKTIME_MASK) - 1); } } return std::make_pair(nMinHeight, nMinTime); } static bool EvaluateSequenceLocks(const CBlockIndex &block, std::pair lockPair) { assert(block.pprev); int64_t nBlockTime = block.pprev->GetMedianTimePast(); if (lockPair.first >= block.nHeight || lockPair.second >= nBlockTime) { return false; } return true; } bool SequenceLocks(const CTransaction &tx, int flags, std::vector *prevHeights, const CBlockIndex &block) { return EvaluateSequenceLocks( block, CalculateSequenceLocks(tx, flags, prevHeights, block)); } bool TestLockPointValidity(const LockPoints *lp) { AssertLockHeld(cs_main); assert(lp); // If there are relative lock times then the maxInputBlock will be set // If there are no relative lock times, the LockPoints don't depend on the // chain if (lp->maxInputBlock) { // Check whether chainActive is an extension of the block at which the // LockPoints // calculation was valid. If not LockPoints are no longer valid if (!chainActive.Contains(lp->maxInputBlock)) { return false; } } // LockPoints still valid return true; } bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints *lp, bool useExistingLockPoints) { AssertLockHeld(cs_main); AssertLockHeld(mempool.cs); CBlockIndex *tip = chainActive.Tip(); CBlockIndex index; index.pprev = tip; // CheckSequenceLocks() uses chainActive.Height()+1 to evaluate height based // locks because when SequenceLocks() is called within ConnectBlock(), the // height of the block *being* evaluated is what is used. Thus if we want to // know if a transaction can be part of the *next* block, we need to use one // more than chainActive.Height() index.nHeight = tip->nHeight + 1; std::pair lockPair; if (useExistingLockPoints) { assert(lp); lockPair.first = lp->height; lockPair.second = lp->time; } else { // pcoinsTip contains the UTXO set for chainActive.Tip() CCoinsViewMemPool viewMemPool(pcoinsTip, mempool); std::vector prevheights; prevheights.resize(tx.vin.size()); for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) { const CTxIn &txin = tx.vin[txinIndex]; Coin coin; if (!viewMemPool.GetCoin(txin.prevout, coin)) { return error("%s: Missing input", __func__); } if (coin.GetHeight() == MEMPOOL_HEIGHT) { // Assume all mempool transaction confirm in the next block prevheights[txinIndex] = tip->nHeight + 1; } else { prevheights[txinIndex] = coin.GetHeight(); } } lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index); if (lp) { lp->height = lockPair.first; lp->time = lockPair.second; // Also store the hash of the block with the highest height of all // the blocks which have sequence locked prevouts. This hash needs // to still be on the chain for these LockPoint calculations to be // valid. // Note: It is impossible to correctly calculate a maxInputBlock if // any of the sequence locked inputs depend on unconfirmed txs, // except in the special case where the relative lock time/height is // 0, which is equivalent to no sequence lock. Since we assume input // height of tip+1 for mempool txs and test the resulting lockPair // from CalculateSequenceLocks against tip+1. We know // EvaluateSequenceLocks will fail if there was a non-zero sequence // lock on a mempool input, so we can use the return value of // CheckSequenceLocks to indicate the LockPoints validity. int maxInputHeight = 0; for (int height : prevheights) { // Can ignore mempool inputs since we'll fail if they had // non-zero locks. if (height != tip->nHeight + 1) { maxInputHeight = std::max(maxInputHeight, height); } } lp->maxInputBlock = tip->GetAncestor(maxInputHeight); } } return EvaluateSequenceLocks(index, lockPair); } uint64_t GetSigOpCountWithoutP2SH(const CTransaction &tx, uint32_t flags) { uint64_t nSigOps = 0; for (const auto &txin : tx.vin) { nSigOps += txin.scriptSig.GetSigOpCount(flags, false); } for (const auto &txout : tx.vout) { nSigOps += txout.scriptPubKey.GetSigOpCount(flags, false); } return nSigOps; } uint64_t GetP2SHSigOpCount(const CTransaction &tx, const CCoinsViewCache &view, uint32_t flags) { if ((flags & SCRIPT_VERIFY_P2SH) == 0 || tx.IsCoinBase()) { return 0; } uint64_t nSigOps = 0; for (auto &i : tx.vin) { const CTxOut &prevout = view.GetOutputFor(i); if (prevout.scriptPubKey.IsPayToScriptHash()) { nSigOps += prevout.scriptPubKey.GetSigOpCount(flags, i.scriptSig); } } return nSigOps; } uint64_t GetTransactionSigOpCount(const CTransaction &tx, const CCoinsViewCache &view, uint32_t flags) { return GetSigOpCountWithoutP2SH(tx, flags) + GetP2SHSigOpCount(tx, view, flags); } static bool CheckTransactionCommon(const CTransaction &tx, CValidationState &state, bool fCheckDuplicateInputs) { // Basic checks that don't depend on any context if (tx.vin.empty()) { return state.DoS(10, false, REJECT_INVALID, "bad-txns-vin-empty"); } if (tx.vout.empty()) { return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty"); } // Size limit if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) > MAX_TX_SIZE) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize"); } // Check for negative or overflow output values Amount nValueOut(0); for (const auto &txout : tx.vout) { if (txout.nValue < Amount(0)) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-negative"); } if (txout.nValue > MAX_MONEY) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-vout-toolarge"); } nValueOut += txout.nValue; if (!MoneyRange(nValueOut)) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-txouttotal-toolarge"); } } if (GetSigOpCountWithoutP2SH(tx, STANDARD_CHECKDATASIG_VERIFY_FLAGS) > MAX_TX_SIGOPS_COUNT) { return state.DoS(100, false, REJECT_INVALID, "bad-txn-sigops"); } // Check for duplicate inputs - note that this check is slow so we skip it // in CheckBlock if (fCheckDuplicateInputs) { std::set vInOutPoints; for (const auto &txin : tx.vin) { if (!vInOutPoints.insert(txin.prevout).second) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-duplicate"); } } } return true; } bool CheckCoinbase(const CTransaction &tx, CValidationState &state, bool fCheckDuplicateInputs) { if (!tx.IsCoinBase()) { return state.DoS(100, false, REJECT_INVALID, "bad-cb-missing", false, "first tx is not coinbase"); } if (!CheckTransactionCommon(tx, state, fCheckDuplicateInputs)) { // CheckTransactionCommon fill in the state. return false; } if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > MAX_COINBASE_SCRIPTSIG_SIZE) { return state.DoS(100, false, REJECT_INVALID, "bad-cb-length"); } return true; } bool CheckRegularTransaction(const CTransaction &tx, CValidationState &state, bool fCheckDuplicateInputs) { if (tx.IsCoinBase()) { return state.DoS(100, false, REJECT_INVALID, "bad-tx-coinbase"); } if (!CheckTransactionCommon(tx, state, fCheckDuplicateInputs)) { // CheckTransactionCommon fill in the state. return false; } for (const auto &txin : tx.vin) { if (txin.prevout.IsNull()) { return state.DoS(10, false, REJECT_INVALID, "bad-txns-prevout-null"); } } return true; } /** Convert CValidationState to a human-readable message for logging */ std::string FormatStateMessage(const CValidationState &state) { return strprintf( "%s%s (code %i)", state.GetRejectReason(), state.GetDebugMessage().empty() ? "" : ", " + state.GetDebugMessage(), state.GetRejectCode()); } static bool IsCurrentForFeeEstimation() { AssertLockHeld(cs_main); if (IsInitialBlockDownload()) { return false; } if (chainActive.Tip()->GetBlockTime() < (GetTime() - MAX_FEE_ESTIMATION_TIP_AGE)) { return false; } if (chainActive.Height() < pindexBestHeader->nHeight - 1) { return false; } return true; } static bool IsUAHFenabled(const Config &config, int nHeight) { return nHeight >= config.GetChainParams().GetConsensus().uahfHeight; } bool IsUAHFenabled(const Config &config, const CBlockIndex *pindexPrev) { if (pindexPrev == nullptr) { return false; } return IsUAHFenabled(config, pindexPrev->nHeight); } static bool IsDAAEnabled(const Config &config, int nHeight) { return nHeight >= config.GetChainParams().GetConsensus().daaHeight; } bool IsDAAEnabled(const Config &config, const CBlockIndex *pindexPrev) { if (pindexPrev == nullptr) { return false; } return IsDAAEnabled(config, pindexPrev->nHeight); } static bool IsMagneticAnomalyEnabled(const Config &config, int64_t nMedianTimePast) { return nMedianTimePast >= gArgs.GetArg("-magneticanomalyactivationtime", config.GetChainParams() .GetConsensus() .magneticAnomalyActivationTime); } bool IsMagneticAnomalyEnabled(const Config &config, const CBlockIndex *pindexPrev) { if (pindexPrev == nullptr) { return false; } return IsMagneticAnomalyEnabled(config, pindexPrev->GetMedianTimePast()); } static bool IsMagneticAnomalyEnabledForCurrentBlock(const Config &config) { AssertLockHeld(cs_main); return IsMagneticAnomalyEnabled(config, chainActive.Tip()); } // Command-line argument "-replayprotectionactivationtime=" will // cause the node to switch to replay protected SigHash ForkID value when the // median timestamp of the previous 11 blocks is greater than or equal to // . Defaults to the pre-defined timestamp when not set. static bool IsReplayProtectionEnabled(const Config &config, int64_t nMedianTimePast) { return nMedianTimePast >= gArgs.GetArg( "-replayprotectionactivationtime", config.GetChainParams().GetConsensus().greatWallActivationTime); } static bool IsReplayProtectionEnabled(const Config &config, const CBlockIndex *pindexPrev) { if (pindexPrev == nullptr) { return false; } return IsReplayProtectionEnabled(config, pindexPrev->GetMedianTimePast()); } static bool IsReplayProtectionEnabledForCurrentBlock(const Config &config) { AssertLockHeld(cs_main); return IsReplayProtectionEnabled(config, chainActive.Tip()); } // Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool // were somehow broken and returning the wrong scriptPubKeys static bool CheckInputsFromMempoolAndCache(const CTransaction &tx, CValidationState &state, const CCoinsViewCache &view, CTxMemPool &pool, const uint32_t flags, bool cacheSigStore, PrecomputedTransactionData &txdata) { AssertLockHeld(cs_main); // pool.cs should be locked already, but go ahead and re-take the lock here // to enforce that mempool doesn't change between when we check the view and // when we actually call through to CheckInputs LOCK(pool.cs); assert(!tx.IsCoinBase()); for (const CTxIn &txin : tx.vin) { const Coin &coin = view.AccessCoin(txin.prevout); // At this point we haven't actually checked if the coins are all // available (or shouldn't assume we have, since CheckInputs does). So // we just return failure if the inputs are not available here, and then // only have to check equivalence for available inputs. if (coin.IsSpent()) { return false; } const CTransactionRef &txFrom = pool.get(txin.prevout.GetTxId()); if (txFrom) { assert(txFrom->GetHash() == txin.prevout.GetTxId()); assert(txFrom->vout.size() > txin.prevout.GetN()); assert(txFrom->vout[txin.prevout.GetN()] == coin.GetTxOut()); } else { const Coin &coinFromDisk = pcoinsTip->AccessCoin(txin.prevout); assert(!coinFromDisk.IsSpent()); assert(coinFromDisk.GetTxOut() == coin.GetTxOut()); } } return CheckInputs(tx, state, view, true, flags, cacheSigStore, true, txdata); } static bool AcceptToMemoryPoolWorker( const Config &config, CTxMemPool &pool, CValidationState &state, const CTransactionRef &ptx, bool fLimitFree, bool *pfMissingInputs, int64_t nAcceptTime, bool fOverrideMempoolLimit, const Amount nAbsurdFee, std::vector &coins_to_uncache) { AssertLockHeld(cs_main); const CTransaction &tx = *ptx; const TxId txid = tx.GetId(); if (pfMissingInputs) { *pfMissingInputs = false; } // Coinbase is only valid in a block, not as a loose transaction. if (!CheckRegularTransaction(tx, state, true)) { // state filled in by CheckRegularTransaction. return false; } // Rather not work on nonstandard transactions (unless -testnet/-regtest) std::string reason; if (fRequireStandard && !IsStandardTx(tx, reason)) { return state.DoS(0, false, REJECT_NONSTANDARD, reason); } // Only accept nLockTime-using transactions that can be mined in the next // block; we don't want our mempool filled up with transactions that can't // be mined yet. CValidationState ctxState; if (!ContextualCheckTransactionForCurrentBlock( config, tx, ctxState, STANDARD_LOCKTIME_VERIFY_FLAGS)) { // We copy the state from a dummy to ensure we don't increase the // ban score of peer for transaction that could be valid in the future. return state.DoS( 0, false, REJECT_NONSTANDARD, ctxState.GetRejectReason(), ctxState.CorruptionPossible(), ctxState.GetDebugMessage()); } // Is it already in the memory pool? if (pool.exists(txid)) { return state.Invalid(false, REJECT_ALREADY_KNOWN, "txn-already-in-mempool"); } // Check for conflicts with in-memory transactions { // Protect pool.mapNextTx LOCK(pool.cs); for (const CTxIn &txin : tx.vin) { auto itConflicting = pool.mapNextTx.find(txin.prevout); if (itConflicting != pool.mapNextTx.end()) { // Disable replacement feature for good return state.Invalid(false, REJECT_CONFLICT, "txn-mempool-conflict"); } } } { CCoinsView dummy; CCoinsViewCache view(&dummy); Amount nValueIn(0); LockPoints lp; { LOCK(pool.cs); CCoinsViewMemPool viewMemPool(pcoinsTip, pool); view.SetBackend(viewMemPool); // Do we already have it? for (size_t out = 0; out < tx.vout.size(); out++) { COutPoint outpoint(txid, out); bool had_coin_in_cache = pcoinsTip->HaveCoinInCache(outpoint); if (view.HaveCoin(outpoint)) { if (!had_coin_in_cache) { coins_to_uncache.push_back(outpoint); } return state.Invalid(false, REJECT_ALREADY_KNOWN, "txn-already-known"); } } // Do all inputs exist? for (const CTxIn txin : tx.vin) { if (!pcoinsTip->HaveCoinInCache(txin.prevout)) { coins_to_uncache.push_back(txin.prevout); } if (!view.HaveCoin(txin.prevout)) { if (pfMissingInputs) { *pfMissingInputs = true; } // fMissingInputs and !state.IsInvalid() is used to detect // this condition, don't set state.Invalid() return false; } } // Are the actual inputs available? if (!view.HaveInputs(tx)) { return state.Invalid(false, REJECT_DUPLICATE, "bad-txns-inputs-spent"); } // Bring the best block into scope. view.GetBestBlock(); nValueIn = view.GetValueIn(tx); // We have all inputs cached now, so switch back to dummy, so we // don't need to keep lock on mempool. view.SetBackend(dummy); // Only accept BIP68 sequence locked transactions that can be mined // in the next block; we don't want our mempool filled up with // transactions that can't be mined yet. Must keep pool.cs for this // unless we change CheckSequenceLocks to take a CoinsViewCache // instead of create its own. if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp)) { return state.DoS(0, false, REJECT_NONSTANDARD, "non-BIP68-final"); } } // Check for non-standard pay-to-script-hash in inputs if (fRequireStandard && !AreInputsStandard(tx, view)) { return state.Invalid(false, REJECT_NONSTANDARD, "bad-txns-nonstandard-inputs"); } int64_t nSigOpsCount = GetTransactionSigOpCount(tx, view, STANDARD_SCRIPT_VERIFY_FLAGS); Amount nValueOut = tx.GetValueOut(); Amount nFees = nValueIn - nValueOut; // nModifiedFees includes any fee deltas from PrioritiseTransaction Amount nModifiedFees = nFees; double nPriorityDummy = 0; pool.ApplyDeltas(txid, nPriorityDummy, nModifiedFees); Amount inChainInputValue; double dPriority = view.GetPriority(tx, chainActive.Height(), inChainInputValue); // Keep track of transactions that spend a coinbase, which we re-scan // during reorgs to ensure COINBASE_MATURITY is still met. bool fSpendsCoinbase = false; for (const CTxIn &txin : tx.vin) { const Coin &coin = view.AccessCoin(txin.prevout); if (coin.IsCoinBase()) { fSpendsCoinbase = true; break; } } CTxMemPoolEntry entry(ptx, nFees, nAcceptTime, dPriority, chainActive.Height(), inChainInputValue, fSpendsCoinbase, nSigOpsCount, lp); unsigned int nSize = entry.GetTxSize(); // Check that the transaction doesn't have an excessive number of // sigops, making it impossible to mine. Since the coinbase transaction // itself can contain sigops MAX_STANDARD_TX_SIGOPS is less than // MAX_BLOCK_SIGOPS_PER_MB; we still consider this an invalid rather // than merely non-standard transaction. if (nSigOpsCount > MAX_STANDARD_TX_SIGOPS) { return state.DoS(0, false, REJECT_NONSTANDARD, "bad-txns-too-many-sigops", false, strprintf("%d", nSigOpsCount)); } CFeeRate minRelayTxFee = config.GetMinFeePerKB(); Amount mempoolRejectFee = pool.GetMinFee( gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000) .GetFee(nSize); if (mempoolRejectFee > Amount(0) && nModifiedFees < mempoolRejectFee) { return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", false, strprintf("%d < %d", nFees, mempoolRejectFee)); } if (gArgs.GetBoolArg("-relaypriority", DEFAULT_RELAYPRIORITY) && nModifiedFees < minRelayTxFee.GetFee(nSize) && !AllowFree(entry.GetPriority(chainActive.Height() + 1))) { // Require that free transactions have sufficient priority to be // mined in the next block. return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "insufficient priority"); } // Continuously rate-limit free (really, very-low-fee) transactions. // This mitigates 'penny-flooding' -- sending thousands of free // transactions just to be annoying or make others' transactions take // longer to confirm. if (fLimitFree && nModifiedFees < minRelayTxFee.GetFee(nSize)) { static CCriticalSection csFreeLimiter; static double dFreeCount; static int64_t nLastTime; int64_t nNow = GetTime(); LOCK(csFreeLimiter); // Use an exponentially decaying ~10-minute window: dFreeCount *= pow(1.0 - 1.0 / 600.0, double(nNow - nLastTime)); nLastTime = nNow; // -limitfreerelay unit is thousand-bytes-per-minute // At default rate it would take over a month to fill 1GB if (dFreeCount + nSize >= gArgs.GetArg("-limitfreerelay", DEFAULT_LIMITFREERELAY) * 10 * 1000) { return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "rate limited free transaction"); } LogPrint(BCLog::MEMPOOL, "Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount + nSize); dFreeCount += nSize; } if (nAbsurdFee != Amount(0) && nFees > nAbsurdFee) { return state.Invalid(false, REJECT_HIGHFEE, "absurdly-high-fee", strprintf("%d > %d", nFees, nAbsurdFee)); } // Calculate in-mempool ancestors, up to a limit. CTxMemPool::setEntries setAncestors; size_t nLimitAncestors = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT); size_t nLimitAncestorSize = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT) * 1000; size_t nLimitDescendants = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT); size_t nLimitDescendantSize = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000; std::string errString; if (!pool.CalculateMemPoolAncestors( entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) { return state.DoS(0, false, REJECT_NONSTANDARD, "too-long-mempool-chain", false, errString); } // Set extraFlags as a set of flags that needs to be activated. uint32_t extraFlags = SCRIPT_VERIFY_NONE; if (IsReplayProtectionEnabledForCurrentBlock(config)) { extraFlags |= SCRIPT_ENABLE_REPLAY_PROTECTION; } if (IsMagneticAnomalyEnabledForCurrentBlock(config)) { extraFlags |= SCRIPT_ENABLE_CHECKDATASIG; } // Check inputs based on the set of flags we activate. uint32_t scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS; if (!config.GetChainParams().RequireStandard()) { scriptVerifyFlags = SCRIPT_ENABLE_SIGHASH_FORKID | gArgs.GetArg("-promiscuousmempoolflags", scriptVerifyFlags); } // Make sure whatever we need to activate is actually activated. scriptVerifyFlags |= extraFlags; // Check against previous transactions. This is done last to help // prevent CPU exhaustion denial-of-service attacks. PrecomputedTransactionData txdata(tx); if (!CheckInputs(tx, state, view, true, scriptVerifyFlags, true, false, txdata)) { // State filled in by CheckInputs. return false; } // Check again against the current block tip's script verification flags // to cache our script execution flags. This is, of course, useless if // the next block has different script flags from the previous one, but // because the cache tracks script flags for us it will auto-invalidate // and we'll just have a few blocks of extra misses on soft-fork // activation. // // This is also useful in case of bugs in the standard flags that cause // transactions to pass as valid when they're actually invalid. For // instance the STRICTENC flag was incorrectly allowing certain CHECKSIG // NOT scripts to pass, even though they were invalid. // // There is a similar check in CreateNewBlock() to prevent creating // invalid blocks (using TestBlockValidity), however allowing such // transactions into the mempool can be exploited as a DoS attack. uint32_t currentBlockScriptVerifyFlags = GetBlockScriptFlags(config, chainActive.Tip()); if (!CheckInputsFromMempoolAndCache(tx, state, view, pool, currentBlockScriptVerifyFlags, true, txdata)) { // If we're using promiscuousmempoolflags, we may hit this normally. // Check if current block has some flags that scriptVerifyFlags does // not before printing an ominous warning. if (!(~scriptVerifyFlags & currentBlockScriptVerifyFlags)) { return error( "%s: BUG! PLEASE REPORT THIS! ConnectInputs failed against " "MANDATORY but not STANDARD flags %s, %s", __func__, txid.ToString(), FormatStateMessage(state)); } if (!CheckInputs(tx, state, view, true, MANDATORY_SCRIPT_VERIFY_FLAGS | extraFlags, true, false, txdata)) { return error( "%s: ConnectInputs failed against MANDATORY but not " "STANDARD flags due to promiscuous mempool %s, %s", __func__, txid.ToString(), FormatStateMessage(state)); } LogPrintf("Warning: -promiscuousmempool flags set to not include " "currently enforced soft forks, this may break mining or " "otherwise cause instability!\n"); } // This transaction should only count for fee estimation if // the node is not behind and it is not dependent on any other // transactions in the mempool. bool validForFeeEstimation = IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx); // Store transaction in memory. pool.addUnchecked(txid, entry, setAncestors, validForFeeEstimation); // Trim mempool and check if tx was trimmed. if (!fOverrideMempoolLimit) { pool.LimitSize( gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60); if (!pool.exists(txid)) { return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool full"); } } } GetMainSignals().TransactionAddedToMempool(ptx); return true; } /** * (try to) add transaction to memory pool with a specified acceptance time. */ static bool AcceptToMemoryPoolWithTime(const Config &config, CTxMemPool &pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree, bool *pfMissingInputs, int64_t nAcceptTime, bool fOverrideMempoolLimit = false, const Amount nAbsurdFee = Amount(0)) { std::vector coins_to_uncache; bool res = AcceptToMemoryPoolWorker( config, pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache); if (!res) { for (const COutPoint &outpoint : coins_to_uncache) { pcoinsTip->Uncache(outpoint); } } // After we've (potentially) uncached entries, ensure our coins cache is // still within its size limits CValidationState stateDummy; FlushStateToDisk(config.GetChainParams(), stateDummy, FLUSH_STATE_PERIODIC); return res; } bool AcceptToMemoryPool(const Config &config, CTxMemPool &pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree, bool *pfMissingInputs, bool fOverrideMempoolLimit, const Amount nAbsurdFee) { return AcceptToMemoryPoolWithTime(config, pool, state, tx, fLimitFree, pfMissingInputs, GetTime(), fOverrideMempoolLimit, nAbsurdFee); } /** * Return transaction in txOut, and if it was found inside a block, its hash is * placed in hashBlock. */ bool GetTransaction(const Config &config, const TxId &txid, CTransactionRef &txOut, uint256 &hashBlock, bool fAllowSlow) { CBlockIndex *pindexSlow = nullptr; LOCK(cs_main); CTransactionRef ptx = mempool.get(txid); if (ptx) { txOut = ptx; return true; } if (fTxIndex) { CDiskTxPos postx; if (pblocktree->ReadTxIndex(txid, postx)) { CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION); if (file.IsNull()) { return error("%s: OpenBlockFile failed", __func__); } CBlockHeader header; try { file >> header; fseek(file.Get(), postx.nTxOffset, SEEK_CUR); file >> txOut; } catch (const std::exception &e) { return error("%s: Deserialize or I/O error - %s", __func__, e.what()); } hashBlock = header.GetHash(); if (txOut->GetId() != txid) { return error("%s: txid mismatch", __func__); } return true; } } // use coin database to locate block that contains transaction, and scan it if (fAllowSlow) { const Coin &coin = AccessByTxid(*pcoinsTip, txid); if (!coin.IsSpent()) { pindexSlow = chainActive[coin.GetHeight()]; } } if (pindexSlow) { CBlock block; if (ReadBlockFromDisk(block, pindexSlow, config)) { for (const auto &tx : block.vtx) { if (tx->GetId() == txid) { txOut = tx; hashBlock = pindexSlow->GetBlockHash(); return true; } } } } return false; } ////////////////////////////////////////////////////////////////////////////// // // CBlock and CBlockIndex // static bool WriteBlockToDisk(const CBlock &block, CDiskBlockPos &pos, const CMessageHeader::MessageMagic &messageStart) { // Open history file to append CAutoFile fileout(OpenBlockFile(pos), SER_DISK, CLIENT_VERSION); if (fileout.IsNull()) { return error("WriteBlockToDisk: OpenBlockFile failed"); } // Write index header unsigned int nSize = GetSerializeSize(fileout, block); fileout << FLATDATA(messageStart) << nSize; // Write block long fileOutPos = ftell(fileout.Get()); if (fileOutPos < 0) { return error("WriteBlockToDisk: ftell failed"); } pos.nPos = (unsigned int)fileOutPos; fileout << block; return true; } bool ReadBlockFromDisk(CBlock &block, const CDiskBlockPos &pos, const Config &config) { block.SetNull(); // Open history file to read CAutoFile filein(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION); if (filein.IsNull()) { return error("ReadBlockFromDisk: OpenBlockFile failed for %s", pos.ToString()); } // Read block try { filein >> block; } catch (const std::exception &e) { return error("%s: Deserialize or I/O error - %s at %s", __func__, e.what(), pos.ToString()); } // Check the header if (!CheckProofOfWork(block.GetHash(), block.nBits, config)) { return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString()); } return true; } bool ReadBlockFromDisk(CBlock &block, const CBlockIndex *pindex, const Config &config) { if (!ReadBlockFromDisk(block, pindex->GetBlockPos(), config)) { return false; } if (block.GetHash() != pindex->GetBlockHash()) { return error("ReadBlockFromDisk(CBlock&, CBlockIndex*): GetHash() " "doesn't match index for %s at %s", pindex->ToString(), pindex->GetBlockPos().ToString()); } return true; } Amount GetBlockSubsidy(int nHeight, const Consensus::Params &consensusParams) { int halvings = nHeight / consensusParams.nSubsidyHalvingInterval; // Force block reward to zero when right shift is undefined. if (halvings >= 64) { return Amount(0); } Amount nSubsidy = 50 * COIN; // Subsidy is cut in half every 210,000 blocks which will occur // approximately every 4 years. return Amount((nSubsidy / SATOSHI) >> halvings); } bool IsInitialBlockDownload() { // Once this function has returned false, it must remain false. static std::atomic latchToFalse{false}; // Optimization: pre-test latch before taking the lock. if (latchToFalse.load(std::memory_order_relaxed)) { return false; } LOCK(cs_main); if (latchToFalse.load(std::memory_order_relaxed)) { return false; } if (fImporting || fReindex) { return true; } if (chainActive.Tip() == nullptr) { return true; } if (chainActive.Tip()->nChainWork < nMinimumChainWork) { return true; } if (chainActive.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge)) { return true; } LogPrintf("Leaving InitialBlockDownload (latching to false)\n"); latchToFalse.store(true, std::memory_order_relaxed); return false; } CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr; static void AlertNotify(const std::string &strMessage) { uiInterface.NotifyAlertChanged(); std::string strCmd = gArgs.GetArg("-alertnotify", ""); if (strCmd.empty()) { return; } // Alert text should be plain ascii coming from a trusted source, but to be // safe we first strip anything not in safeChars, then add single quotes // around the whole string before passing it to the shell: std::string singleQuote("'"); std::string safeStatus = SanitizeString(strMessage); safeStatus = singleQuote + safeStatus + singleQuote; boost::replace_all(strCmd, "%s", safeStatus); // thread runs free boost::thread t(runCommand, strCmd); } static void CheckForkWarningConditions() { AssertLockHeld(cs_main); // Before we get past initial download, we cannot reliably alert about forks // (we assume we don't get stuck on a fork before finishing our initial // sync) if (IsInitialBlockDownload()) { return; } // If our best fork is no longer within 72 blocks (+/- 12 hours if no one // mines it) of our head, drop it if (pindexBestForkTip && chainActive.Height() - pindexBestForkTip->nHeight >= 72) { pindexBestForkTip = nullptr; } if (pindexBestForkTip || (pindexBestInvalid && pindexBestInvalid->nChainWork > chainActive.Tip()->nChainWork + (GetBlockProof(*chainActive.Tip()) * 6))) { if (!GetfLargeWorkForkFound() && pindexBestForkBase) { std::string warning = std::string("'Warning: Large-work fork detected, forking after " "block ") + pindexBestForkBase->phashBlock->ToString() + std::string("'"); AlertNotify(warning); } if (pindexBestForkTip && pindexBestForkBase) { LogPrintf("%s: Warning: Large valid fork found\n forking the " "chain at height %d (%s)\n lasting to height %d " "(%s).\nChain state database corruption likely.\n", __func__, pindexBestForkBase->nHeight, pindexBestForkBase->phashBlock->ToString(), pindexBestForkTip->nHeight, pindexBestForkTip->phashBlock->ToString()); SetfLargeWorkForkFound(true); } else { LogPrintf("%s: Warning: Found invalid chain at least ~6 blocks " "longer than our best chain.\nChain state database " "corruption likely.\n", __func__); SetfLargeWorkInvalidChainFound(true); } } else { SetfLargeWorkForkFound(false); SetfLargeWorkInvalidChainFound(false); } } static void CheckForkWarningConditionsOnNewFork(CBlockIndex *pindexNewForkTip) { AssertLockHeld(cs_main); // If we are on a fork that is sufficiently large, set a warning flag CBlockIndex *pfork = pindexNewForkTip; CBlockIndex *plonger = chainActive.Tip(); while (pfork && pfork != plonger) { while (plonger && plonger->nHeight > pfork->nHeight) { plonger = plonger->pprev; } if (pfork == plonger) { break; } pfork = pfork->pprev; } // We define a condition where we should warn the user about as a fork of at // least 7 blocks with a tip within 72 blocks (+/- 12 hours if no one mines // it) of ours. We use 7 blocks rather arbitrarily as it represents just // under 10% of sustained network hash rate operating on the fork, or a // chain that is entirely longer than ours and invalid (note that this // should be detected by both). We define it this way because it allows us // to only store the highest fork tip (+ base) which meets the 7-block // condition and from this always have the most-likely-to-cause-warning fork if (pfork && (!pindexBestForkTip || (pindexBestForkTip && pindexNewForkTip->nHeight > pindexBestForkTip->nHeight)) && pindexNewForkTip->nChainWork - pfork->nChainWork > (GetBlockProof(*pfork) * 7) && chainActive.Height() - pindexNewForkTip->nHeight < 72) { pindexBestForkTip = pindexNewForkTip; pindexBestForkBase = pfork; } CheckForkWarningConditions(); } static void InvalidChainFound(CBlockIndex *pindexNew) { if (!pindexBestInvalid || pindexNew->nChainWork > pindexBestInvalid->nChainWork) { pindexBestInvalid = pindexNew; } LogPrintf( "%s: invalid block=%s height=%d log2_work=%.8g date=%s\n", __func__, pindexNew->GetBlockHash().ToString(), pindexNew->nHeight, log(pindexNew->nChainWork.getdouble()) / log(2.0), DateTimeStrFormat("%Y-%m-%d %H:%M:%S", pindexNew->GetBlockTime())); CBlockIndex *tip = chainActive.Tip(); assert(tip); LogPrintf("%s: current best=%s height=%d log2_work=%.8g date=%s\n", __func__, tip->GetBlockHash().ToString(), chainActive.Height(), log(tip->nChainWork.getdouble()) / log(2.0), DateTimeStrFormat("%Y-%m-%d %H:%M:%S", tip->GetBlockTime())); CheckForkWarningConditions(); } static void InvalidBlockFound(CBlockIndex *pindex, const CValidationState &state) { if (!state.CorruptionPossible()) { pindex->nStatus = pindex->nStatus.withFailed(); setDirtyBlockIndex.insert(pindex); setBlockIndexCandidates.erase(pindex); InvalidChainFound(pindex); } } void SpendCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo, int nHeight) { // Mark inputs spent. if (tx.IsCoinBase()) { return; } txundo.vprevout.reserve(tx.vin.size()); for (const CTxIn &txin : tx.vin) { txundo.vprevout.emplace_back(); bool is_spent = view.SpendCoin(txin.prevout, &txundo.vprevout.back()); assert(is_spent); } } void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo, int nHeight) { SpendCoins(view, tx, txundo, nHeight); AddCoins(view, tx, nHeight); } void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight) { // Mark inputs spent. if (!tx.IsCoinBase()) { for (const CTxIn &txin : tx.vin) { bool is_spent = view.SpendCoin(txin.prevout); assert(is_spent); } } // Add outputs. AddCoins(view, tx, nHeight); } bool CScriptCheck::operator()() { const CScript &scriptSig = ptxTo->vin[nIn].scriptSig; return VerifyScript(scriptSig, scriptPubKey, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, amount, cacheStore, txdata), &error); } int GetSpendHeight(const CCoinsViewCache &inputs) { LOCK(cs_main); CBlockIndex *pindexPrev = mapBlockIndex.find(inputs.GetBestBlock())->second; return pindexPrev->nHeight + 1; } namespace Consensus { bool CheckTxInputs(const CTransaction &tx, CValidationState &state, const CCoinsViewCache &inputs, int nSpendHeight) { // This doesn't trigger the DoS code on purpose; if it did, it would make it // easier for an attacker to attempt to split the network. if (!inputs.HaveInputs(tx)) { return state.Invalid(false, 0, "", "Inputs unavailable"); } Amount nValueIn(0); Amount nFees(0); for (const auto &in : tx.vin) { const COutPoint &prevout = in.prevout; const Coin &coin = inputs.AccessCoin(prevout); assert(!coin.IsSpent()); // If prev is coinbase, check that it's matured if (coin.IsCoinBase()) { if (nSpendHeight - coin.GetHeight() < COINBASE_MATURITY) { return state.Invalid( false, REJECT_INVALID, "bad-txns-premature-spend-of-coinbase", strprintf("tried to spend coinbase at depth %d", nSpendHeight - coin.GetHeight())); } } // Check for negative or overflow input values nValueIn += coin.GetTxOut().nValue; if (!MoneyRange(coin.GetTxOut().nValue) || !MoneyRange(nValueIn)) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputvalues-outofrange"); } } if (nValueIn < tx.GetValueOut()) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout", false, strprintf("value in (%s) < value out (%s)", FormatMoney(nValueIn), FormatMoney(tx.GetValueOut()))); } // Tally transaction fees Amount nTxFee = nValueIn - tx.GetValueOut(); if (nTxFee < Amount(0)) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-negative"); } nFees += nTxFee; if (!MoneyRange(nFees)) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange"); } return true; } } // namespace Consensus bool CheckInputs(const CTransaction &tx, CValidationState &state, const CCoinsViewCache &inputs, bool fScriptChecks, const uint32_t flags, bool sigCacheStore, bool scriptCacheStore, const PrecomputedTransactionData &txdata, std::vector *pvChecks) { assert(!tx.IsCoinBase()); if (!Consensus::CheckTxInputs(tx, state, inputs, GetSpendHeight(inputs))) { return false; } if (pvChecks) { pvChecks->reserve(tx.vin.size()); } // The first loop above does all the inexpensive checks. Only if ALL inputs // pass do we perform expensive ECDSA signature checks. Helps prevent CPU // exhaustion attacks. // Skip script verification when connecting blocks under the assumedvalid // block. Assuming the assumedvalid block is valid this is safe because // block merkle hashes are still computed and checked, of course, if an // assumed valid block is invalid due to false scriptSigs this optimization // would allow an invalid chain to be accepted. if (!fScriptChecks) { return true; } // First check if script executions have been cached with the same flags. // Note that this assumes that the inputs provided are correct (ie that the // transaction hash which is in tx's prevouts properly commits to the // scriptPubKey in the inputs view of that transaction). uint256 hashCacheEntry = GetScriptCacheKey(tx, flags); if (IsKeyInScriptCache(hashCacheEntry, !scriptCacheStore)) { return true; } for (size_t i = 0; i < tx.vin.size(); i++) { const COutPoint &prevout = tx.vin[i].prevout; const Coin &coin = inputs.AccessCoin(prevout); assert(!coin.IsSpent()); // We very carefully only pass in things to CScriptCheck which are // clearly committed to by tx' witness hash. This provides a sanity // check that our caching is not introducing consensus failures through // additional data in, eg, the coins being spent being checked as a part // of CScriptCheck. const CScript &scriptPubKey = coin.GetTxOut().scriptPubKey; const Amount amount = coin.GetTxOut().nValue; // Verify signature CScriptCheck check(scriptPubKey, amount, tx, i, flags, sigCacheStore, txdata); if (pvChecks) { pvChecks->push_back(std::move(check)); } else if (!check()) { const bool hasNonMandatoryFlags = (flags & STANDARD_NOT_MANDATORY_VERIFY_FLAGS) != 0; if (hasNonMandatoryFlags) { // Check whether the failure was caused by a non-mandatory // script verification check, such as non-standard DER encodings // or non-null dummy arguments; if so, don't trigger DoS // protection to avoid splitting the network between upgraded // and non-upgraded nodes. // // We also check activating the monolith opcodes as it is a // strictly additive change and we would not like to ban some of // our peer that are ahead of us and are considering the fork // as activated. CScriptCheck check2(scriptPubKey, amount, tx, i, flags & ~STANDARD_NOT_MANDATORY_VERIFY_FLAGS, sigCacheStore, txdata); if (check2()) { return state.Invalid( false, REJECT_NONSTANDARD, strprintf("non-mandatory-script-verify-flag (%s)", ScriptErrorString(check.GetScriptError()))); } } // Failures of other flags indicate a transaction that is invalid in // new blocks, e.g. a invalid P2SH. We DoS ban such nodes as they // are not following the protocol. That said during an upgrade // careful thought should be taken as to the correct behavior - we // may want to continue peering with non-upgraded nodes even after // soft-fork super-majority signaling has occurred. return state.DoS( 100, false, REJECT_INVALID, strprintf("mandatory-script-verify-flag-failed (%s)", ScriptErrorString(check.GetScriptError()))); } } if (scriptCacheStore && !pvChecks) { // We executed all of the provided scripts, and were told to cache the // result. Do so now. AddKeyInScriptCache(hashCacheEntry); } return true; } namespace { bool UndoWriteToDisk(const CBlockUndo &blockundo, CDiskBlockPos &pos, const uint256 &hashBlock, const CMessageHeader::MessageMagic &messageStart) { // Open history file to append CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION); if (fileout.IsNull()) { return error("%s: OpenUndoFile failed", __func__); } // Write index header unsigned int nSize = GetSerializeSize(fileout, blockundo); fileout << FLATDATA(messageStart) << nSize; // Write undo data long fileOutPos = ftell(fileout.Get()); if (fileOutPos < 0) { return error("%s: ftell failed", __func__); } pos.nPos = (unsigned int)fileOutPos; fileout << blockundo; // calculate & write checksum CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION); hasher << hashBlock; hasher << blockundo; fileout << hasher.GetHash(); return true; } bool UndoReadFromDisk(CBlockUndo &blockundo, const CDiskBlockPos &pos, const uint256 &hashBlock) { // Open history file to read CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION); if (filein.IsNull()) { return error("%s: OpenUndoFile failed", __func__); } // Read block uint256 hashChecksum; // We need a CHashVerifier as reserializing may lose data CHashVerifier verifier(&filein); try { verifier << hashBlock; verifier >> blockundo; filein >> hashChecksum; } catch (const std::exception &e) { return error("%s: Deserialize or I/O error - %s", __func__, e.what()); } // Verify checksum if (hashChecksum != verifier.GetHash()) { return error("%s: Checksum mismatch", __func__); } return true; } /** Abort with a message */ bool AbortNode(const std::string &strMessage, const std::string &userMessage = "") { SetMiscWarning(strMessage); LogPrintf("*** %s\n", strMessage); uiInterface.ThreadSafeMessageBox( userMessage.empty() ? _("Error: A fatal internal error occurred, see " "debug.log for details") : userMessage, "", CClientUIInterface::MSG_ERROR); StartShutdown(); return false; } bool AbortNode(CValidationState &state, const std::string &strMessage, const std::string &userMessage = "") { AbortNode(strMessage, userMessage); return state.Error(strMessage); } } // namespace /** Restore the UTXO in a Coin at a given COutPoint. */ DisconnectResult UndoCoinSpend(const Coin &undo, CCoinsViewCache &view, const COutPoint &out) { bool fClean = true; if (view.HaveCoin(out)) { // Overwriting transaction output. fClean = false; } if (undo.GetHeight() == 0) { // Missing undo metadata (height and coinbase). Older versions included // this information only in undo records for the last spend of a // transactions' outputs. This implies that it must be present for some // other output of the same tx. const Coin &alternate = AccessByTxid(view, out.GetTxId()); if (alternate.IsSpent()) { // Adding output for transaction without known metadata return DISCONNECT_FAILED; } // This is somewhat ugly, but hopefully utility is limited. This is only // useful when working from legacy on disck data. In any case, putting // the correct information in there doesn't hurt. const_cast(undo) = Coin(undo.GetTxOut(), alternate.GetHeight(), alternate.IsCoinBase()); } // The potential_overwrite parameter to AddCoin is only allowed to be false // if we know for sure that the coin did not already exist in the cache. As // we have queried for that above using HaveCoin, we don't need to guess. // When fClean is false, a coin already existed and it is an overwrite. view.AddCoin(out, std::move(undo), !fClean); return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN; } /** * Undo the effects of this block (with given index) on the UTXO set represented * by coins. When FAILED is returned, view is left in an indeterminate state. */ static DisconnectResult DisconnectBlock(const CBlock &block, const CBlockIndex *pindex, CCoinsViewCache &view) { CBlockUndo blockUndo; CDiskBlockPos pos = pindex->GetUndoPos(); if (pos.IsNull()) { error("DisconnectBlock(): no undo data available"); return DISCONNECT_FAILED; } if (!UndoReadFromDisk(blockUndo, pos, pindex->pprev->GetBlockHash())) { error("DisconnectBlock(): failure reading undo data"); return DISCONNECT_FAILED; } return ApplyBlockUndo(blockUndo, block, pindex, view); } DisconnectResult ApplyBlockUndo(const CBlockUndo &blockUndo, const CBlock &block, const CBlockIndex *pindex, CCoinsViewCache &view) { bool fClean = true; if (blockUndo.vtxundo.size() + 1 != block.vtx.size()) { error("DisconnectBlock(): block and undo data inconsistent"); return DISCONNECT_FAILED; } // First, restore inputs. for (size_t i = 1; i < block.vtx.size(); i++) { const CTransaction &tx = *(block.vtx[i]); const CTxUndo &txundo = blockUndo.vtxundo[i - 1]; if (txundo.vprevout.size() != tx.vin.size()) { error("DisconnectBlock(): transaction and undo data inconsistent"); return DISCONNECT_FAILED; } for (size_t j = 0; j < tx.vin.size(); j++) { const COutPoint &out = tx.vin[j].prevout; const Coin &undo = txundo.vprevout[j]; DisconnectResult res = UndoCoinSpend(undo, view, out); if (res == DISCONNECT_FAILED) { return DISCONNECT_FAILED; } fClean = fClean && res != DISCONNECT_UNCLEAN; } } // Second, revert created outputs. for (const auto &ptx : block.vtx) { const CTransaction &tx = *ptx; const TxId &txid = tx.GetId(); // Check that all outputs are available and match the outputs in the // block itself exactly. for (size_t o = 0; o < tx.vout.size(); o++) { if (tx.vout[o].scriptPubKey.IsUnspendable()) { continue; } COutPoint out(txid, o); Coin coin; bool is_spent = view.SpendCoin(out, &coin); if (!is_spent || tx.vout[o] != coin.GetTxOut()) { // transaction output mismatch fClean = false; } } } // Move best block pointer to previous block. view.SetBestBlock(block.hashPrevBlock); return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN; } static void FlushBlockFile(bool fFinalize = false) { LOCK(cs_LastBlockFile); CDiskBlockPos posOld(nLastBlockFile, 0); FILE *fileOld = OpenBlockFile(posOld); if (fileOld) { if (fFinalize) { TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nSize); } FileCommit(fileOld); fclose(fileOld); } fileOld = OpenUndoFile(posOld); if (fileOld) { if (fFinalize) { TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nUndoSize); } FileCommit(fileOld); fclose(fileOld); } } static bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigned int nAddSize); static CCheckQueue scriptcheckqueue(128); void ThreadScriptCheck() { RenameThread("bitcoin-scriptch"); scriptcheckqueue.Thread(); } // Protected by cs_main VersionBitsCache versionbitscache; int32_t ComputeBlockVersion(const CBlockIndex *pindexPrev, const Consensus::Params ¶ms) { int32_t nVersion = VERSIONBITS_TOP_BITS; return nVersion; } // Returns the script flags which should be checked for a given block static uint32_t GetBlockScriptFlags(const Config &config, const CBlockIndex *pChainTip) { AssertLockHeld(cs_main); const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); uint32_t flags = SCRIPT_VERIFY_NONE; // P2SH didn't become active until Apr 1 2012 if (pChainTip->GetMedianTimePast() >= P2SH_ACTIVATION_TIME) { flags |= SCRIPT_VERIFY_P2SH; } // Start enforcing the DERSIG (BIP66) rule. if ((pChainTip->nHeight + 1) >= consensusParams.BIP66Height) { flags |= SCRIPT_VERIFY_DERSIG; } // Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule. if ((pChainTip->nHeight + 1) >= consensusParams.BIP65Height) { flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY; } // Start enforcing CSV (BIP68, BIP112 and BIP113) rule. if ((pChainTip->nHeight + 1) >= consensusParams.CSVHeight) { flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY; } // If the UAHF is enabled, we start accepting replay protected txns if (IsUAHFenabled(config, pChainTip)) { flags |= SCRIPT_VERIFY_STRICTENC; flags |= SCRIPT_ENABLE_SIGHASH_FORKID; } // If the DAA HF is enabled, we start rejecting transaction that use a high // s in their signature. We also make sure that signature that are supposed // to fail (for instance in multisig or other forms of smart contracts) are // null. if (IsDAAEnabled(config, pChainTip)) { flags |= SCRIPT_VERIFY_LOW_S; flags |= SCRIPT_VERIFY_NULLFAIL; } // When the magnetic anomaly fork is enabled, we start accepting // transactions using the OP_CHECKDATASIG opcode and it's verify // alternative. We also start enforcing push only signatures and // clean stack. if (IsMagneticAnomalyEnabled(config, pChainTip)) { flags |= SCRIPT_ENABLE_CHECKDATASIG; flags |= SCRIPT_VERIFY_SIGPUSHONLY; flags |= SCRIPT_VERIFY_CLEANSTACK; } // We make sure this node will have replay protection during the next hard // fork. if (IsReplayProtectionEnabled(config, pChainTip)) { flags |= SCRIPT_ENABLE_REPLAY_PROTECTION; } return flags; } static int64_t nTimeCheck = 0; static int64_t nTimeForks = 0; static int64_t nTimeVerify = 0; static int64_t nTimeConnect = 0; static int64_t nTimeIndex = 0; static int64_t nTimeCallbacks = 0; static int64_t nTimeTotal = 0; /** * Apply the effects of this block (with given index) on the UTXO set * represented by coins. Validity checks that depend on the UTXO set are also * done; ConnectBlock() can fail if those validity checks fail (among other * reasons). */ static bool ConnectBlock(const Config &config, const CBlock &block, CValidationState &state, CBlockIndex *pindex, CCoinsViewCache &view, bool fJustCheck = false) { AssertLockHeld(cs_main); int64_t nTimeStart = GetTimeMicros(); // Check it again in case a previous version let a bad block in BlockValidationOptions validationOptions = BlockValidationOptions(!fJustCheck, !fJustCheck); if (!CheckBlock(config, block, state, validationOptions)) { return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state)); } // Verify that the view's current state corresponds to the previous block uint256 hashPrevBlock = pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash(); assert(hashPrevBlock == view.GetBestBlock()); // Special case for the genesis block, skipping connection of its // transactions (its coinbase is unspendable) const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); if (block.GetHash() == consensusParams.hashGenesisBlock) { if (!fJustCheck) { view.SetBestBlock(pindex->GetBlockHash()); } return true; } bool fScriptChecks = true; if (!hashAssumeValid.IsNull()) { // We've been configured with the hash of a block which has been // externally verified to have a valid history. A suitable default value // is included with the software and updated from time to time. Because // validity relative to a piece of software is an objective fact these // defaults can be easily reviewed. This setting doesn't force the // selection of any particular chain but makes validating some faster by // effectively caching the result of part of the verification. BlockMap::const_iterator it = mapBlockIndex.find(hashAssumeValid); if (it != mapBlockIndex.end()) { if (it->second->GetAncestor(pindex->nHeight) == pindex && pindexBestHeader->GetAncestor(pindex->nHeight) == pindex && pindexBestHeader->nChainWork >= nMinimumChainWork) { // This block is a member of the assumed verified chain and an // ancestor of the best header. The equivalent time check // discourages hashpower from extorting the network via DOS // attack into accepting an invalid block through telling users // they must manually set assumevalid. Requiring a software // change or burying the invalid block, regardless of the // setting, makes it hard to hide the implication of the demand. // This also avoids having release candidates that are hardly // doing any signature verification at all in testing without // having to artificially set the default assumed verified block // further back. The test against nMinimumChainWork prevents the // skipping when denied access to any chain at least as good as // the expected chain. fScriptChecks = (GetBlockProofEquivalentTime( *pindexBestHeader, *pindex, *pindexBestHeader, consensusParams) <= 60 * 60 * 24 * 7 * 2); } } } int64_t nTime1 = GetTimeMicros(); nTimeCheck += nTime1 - nTimeStart; LogPrint(BCLog::BENCH, " - Sanity checks: %.2fms [%.2fs]\n", 0.001 * (nTime1 - nTimeStart), nTimeCheck * 0.000001); // Do not allow blocks that contain transactions which 'overwrite' older // transactions, unless those are already completely spent. If such // overwrites are allowed, coinbases and transactions depending upon those // can be duplicated to remove the ability to spend the first instance -- // even after being sent to another address. See BIP30 and // http://r6.ca/blog/20120206T005236Z.html for more information. This logic // is not necessary for memory pool transactions, as AcceptToMemoryPool // already refuses previously-known transaction ids entirely. This rule was // originally applied to all blocks with a timestamp after March 15, 2012, // 0:00 UTC. Now that the whole chain is irreversibly beyond that time it is // applied to all blocks except the two in the chain that violate it. This // prevents exploiting the issue against nodes during their initial block // download. bool fEnforceBIP30 = (!pindex->phashBlock) || // Enforce on CreateNewBlock // invocations which don't // have a hash. !((pindex->nHeight == 91842 && pindex->GetBlockHash() == uint256S("0x00000000000a4d0a398161ffc163c503763" "b1f4360639393e0e4c8e300e0caec")) || (pindex->nHeight == 91880 && pindex->GetBlockHash() == uint256S("0x00000000000743f190a18c5577a3c2d2a1f" "610ae9601ac046a38084ccb7cd721"))); // Once BIP34 activated it was not possible to create new duplicate // coinbases and thus other than starting with the 2 existing duplicate // coinbase pairs, not possible to create overwriting txs. But by the time // BIP34 activated, in each of the existing pairs the duplicate coinbase had // overwritten the first before the first had been spent. Since those // coinbases are sufficiently buried its no longer possible to create // further duplicate transactions descending from the known pairs either. If // we're on the known chain at height greater than where BIP34 activated, we // can save the db accesses needed for the BIP30 check. CBlockIndex *pindexBIP34height = pindex->pprev->GetAncestor(consensusParams.BIP34Height); // Only continue to enforce if we're below BIP34 activation height or the // block hash at that height doesn't correspond. fEnforceBIP30 = fEnforceBIP30 && (!pindexBIP34height || !(pindexBIP34height->GetBlockHash() == consensusParams.BIP34Hash)); if (fEnforceBIP30) { for (const auto &tx : block.vtx) { for (size_t o = 0; o < tx->vout.size(); o++) { if (view.HaveCoin(COutPoint(tx->GetId(), o))) { return state.DoS( 100, error("ConnectBlock(): tried to overwrite transaction"), REJECT_INVALID, "bad-txns-BIP30"); } } } } // Start enforcing BIP68 (sequence locks). int nLockTimeFlags = 0; if (pindex->nHeight >= consensusParams.CSVHeight) { nLockTimeFlags |= LOCKTIME_VERIFY_SEQUENCE; } const uint32_t flags = GetBlockScriptFlags(config, pindex->pprev); const bool fIsMagneticAnomalyEnabled = IsMagneticAnomalyEnabled(config, pindex->pprev); int64_t nTime2 = GetTimeMicros(); nTimeForks += nTime2 - nTime1; LogPrint(BCLog::BENCH, " - Fork checks: %.2fms [%.2fs]\n", 0.001 * (nTime2 - nTime1), nTimeForks * 0.000001); CBlockUndo blockundo; CCheckQueueControl control(fScriptChecks ? &scriptcheckqueue : nullptr); std::vector prevheights; Amount nFees(0); int nInputs = 0; // Sigops counting. We need to do it again because of P2SH. uint64_t nSigOpsCount = 0; const uint64_t currentBlockSize = ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION); const uint64_t nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize); CDiskTxPos pos(pindex->GetBlockPos(), GetSizeOfCompactSize(block.vtx.size())); std::vector> vPos; vPos.reserve(block.vtx.size()); blockundo.vtxundo.reserve(block.vtx.size() - 1); for (const auto &ptx : block.vtx) { const CTransaction &tx = *ptx; nInputs += tx.vin.size(); vPos.push_back(std::make_pair(tx.GetId(), pos)); pos.nTxOffset += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION); if (tx.IsCoinBase()) { // We've already checked for sigops count before P2SH in CheckBlock. nSigOpsCount += GetSigOpCountWithoutP2SH(tx, flags); } if (fIsMagneticAnomalyEnabled || tx.IsCoinBase()) { AddCoins(view, tx, pindex->nHeight); } } for (const auto &ptx : block.vtx) { const CTransaction &tx = *ptx; if (tx.IsCoinBase()) { continue; } if (!view.HaveInputs(tx)) { return state.DoS(100, error("ConnectBlock(): inputs missing/spent"), REJECT_INVALID, "bad-txns-inputs-missingorspent"); } // Check that transaction is BIP68 final BIP68 lock checks (as // opposed to nLockTime checks) must be in ConnectBlock because they // require the UTXO set. prevheights.resize(tx.vin.size()); for (size_t j = 0; j < tx.vin.size(); j++) { prevheights[j] = view.AccessCoin(tx.vin[j].prevout).GetHeight(); } if (!SequenceLocks(tx, nLockTimeFlags, &prevheights, *pindex)) { return state.DoS( 100, error("%s: contains a non-BIP68-final transaction", __func__), REJECT_INVALID, "bad-txns-nonfinal"); } // GetTransactionSigOpCount counts 2 types of sigops: // * legacy (always) // * p2sh (when P2SH enabled in flags and excludes coinbase) auto txSigOpsCount = GetTransactionSigOpCount(tx, view, flags); if (txSigOpsCount > MAX_TX_SIGOPS_COUNT) { return state.DoS(100, false, REJECT_INVALID, "bad-txn-sigops"); } nSigOpsCount += txSigOpsCount; if (nSigOpsCount > nMaxSigOpsCount) { return state.DoS(100, error("ConnectBlock(): too many sigops"), REJECT_INVALID, "bad-blk-sigops"); } Amount fee = view.GetValueIn(tx) - tx.GetValueOut(); nFees += fee; // Don't cache results if we're actually connecting blocks (still // consult the cache, though). bool fCacheResults = fJustCheck; std::vector vChecks; if (!CheckInputs(tx, state, view, fScriptChecks, flags, fCacheResults, fCacheResults, PrecomputedTransactionData(tx), &vChecks)) { return error("ConnectBlock(): CheckInputs on %s failed with %s", tx.GetId().ToString(), FormatStateMessage(state)); } control.Add(vChecks); blockundo.vtxundo.push_back(CTxUndo()); SpendCoins(view, tx, blockundo.vtxundo.back(), pindex->nHeight); if (!fIsMagneticAnomalyEnabled) { AddCoins(view, tx, pindex->nHeight); } } int64_t nTime3 = GetTimeMicros(); nTimeConnect += nTime3 - nTime2; LogPrint(BCLog::BENCH, " - Connect %u transactions: %.2fms (%.3fms/tx, " "%.3fms/txin) [%.2fs]\n", (unsigned)block.vtx.size(), 0.001 * (nTime3 - nTime2), 0.001 * (nTime3 - nTime2) / block.vtx.size(), nInputs <= 1 ? 0 : 0.001 * (nTime3 - nTime2) / (nInputs - 1), nTimeConnect * 0.000001); Amount blockReward = nFees + GetBlockSubsidy(pindex->nHeight, consensusParams); if (block.vtx[0]->GetValueOut() > blockReward) { return state.DoS(100, error("ConnectBlock(): coinbase pays too much " "(actual=%d vs limit=%d)", block.vtx[0]->GetValueOut(), blockReward), REJECT_INVALID, "bad-cb-amount"); } if (!control.Wait()) { return state.DoS(100, false, REJECT_INVALID, "blk-bad-inputs", false, "parallel script check failed"); } int64_t nTime4 = GetTimeMicros(); nTimeVerify += nTime4 - nTime2; LogPrint(BCLog::BENCH, " - Verify %u txins: %.2fms (%.3fms/txin) [%.2fs]\n", nInputs - 1, 0.001 * (nTime4 - nTime2), nInputs <= 1 ? 0 : 0.001 * (nTime4 - nTime2) / (nInputs - 1), nTimeVerify * 0.000001); if (fJustCheck) { return true; } // Write undo information to disk if (pindex->GetUndoPos().IsNull() || !pindex->IsValid(BlockValidity::SCRIPTS)) { if (pindex->GetUndoPos().IsNull()) { CDiskBlockPos _pos; if (!FindUndoPos( state, pindex->nFile, _pos, ::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) + 40)) { return error("ConnectBlock(): FindUndoPos failed"); } if (!UndoWriteToDisk(blockundo, _pos, pindex->pprev->GetBlockHash(), config.GetChainParams().DiskMagic())) { return AbortNode(state, "Failed to write undo data"); } // update nUndoPos in block index pindex->nUndoPos = _pos.nPos; pindex->nStatus = pindex->nStatus.withUndo(); } pindex->RaiseValidity(BlockValidity::SCRIPTS); setDirtyBlockIndex.insert(pindex); } if (fTxIndex && !pblocktree->WriteTxIndex(vPos)) { return AbortNode(state, "Failed to write transaction index"); } // add this block to the view's block chain view.SetBestBlock(pindex->GetBlockHash()); int64_t nTime5 = GetTimeMicros(); nTimeIndex += nTime5 - nTime4; LogPrint(BCLog::BENCH, " - Index writing: %.2fms [%.2fs]\n", 0.001 * (nTime5 - nTime4), nTimeIndex * 0.000001); int64_t nTime6 = GetTimeMicros(); nTimeCallbacks += nTime6 - nTime5; LogPrint(BCLog::BENCH, " - Callbacks: %.2fms [%.2fs]\n", 0.001 * (nTime6 - nTime5), nTimeCallbacks * 0.000001); // If we just activated the replay protection with that block, it means // transaction in the mempool are now invalid. As a result, we need to clear // the mempool. if (IsReplayProtectionEnabled(config, pindex) && !IsReplayProtectionEnabled(config, pindex->pprev)) { mempool.clear(); } return true; } /** * Update the on-disk chain state. * The caches and indexes are flushed depending on the mode we're called with if * they're too large, if it's been a while since the last write, or always and * in all cases if we're in prune mode and are deleting files. */ static bool FlushStateToDisk(const CChainParams &chainparams, CValidationState &state, FlushStateMode mode, int nManualPruneHeight) { int64_t nMempoolUsage = mempool.DynamicMemoryUsage(); LOCK(cs_main); static int64_t nLastWrite = 0; static int64_t nLastFlush = 0; static int64_t nLastSetChain = 0; std::set setFilesToPrune; bool fFlushForPrune = false; bool fDoFullFlush = false; int64_t nNow = 0; try { { LOCK(cs_LastBlockFile); if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) { if (nManualPruneHeight > 0) { FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight); } else { FindFilesToPrune(setFilesToPrune, chainparams.PruneAfterHeight()); fCheckForPruning = false; } if (!setFilesToPrune.empty()) { fFlushForPrune = true; if (!fHavePruned) { pblocktree->WriteFlag("prunedblockfiles", true); fHavePruned = true; } } } nNow = GetTimeMicros(); // Avoid writing/flushing immediately after startup. if (nLastWrite == 0) { nLastWrite = nNow; } if (nLastFlush == 0) { nLastFlush = nNow; } if (nLastSetChain == 0) { nLastSetChain = nNow; } int64_t nMempoolSizeMax = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000; int64_t cacheSize = pcoinsTip->DynamicMemoryUsage(); int64_t nTotalSpace = nCoinCacheUsage + std::max(nMempoolSizeMax - nMempoolUsage, 0); // The cache is large and we're within 10% and 10 MiB of the limit, // but we have time now (not in the middle of a block processing). bool fCacheLarge = mode == FLUSH_STATE_PERIODIC && cacheSize > std::max((9 * nTotalSpace) / 10, nTotalSpace - MAX_BLOCK_COINSDB_USAGE * 1024 * 1024); // The cache is over the limit, we have to write now. bool fCacheCritical = mode == FLUSH_STATE_IF_NEEDED && cacheSize > nTotalSpace; // It's been a while since we wrote the block index to disk. Do this // frequently, so we don't need to redownload after a crash. bool fPeriodicWrite = mode == FLUSH_STATE_PERIODIC && nNow > nLastWrite + (int64_t)DATABASE_WRITE_INTERVAL * 1000000; // It's been very long since we flushed the cache. Do this // infrequently, to optimize cache usage. bool fPeriodicFlush = mode == FLUSH_STATE_PERIODIC && nNow > nLastFlush + (int64_t)DATABASE_FLUSH_INTERVAL * 1000000; // Combine all conditions that result in a full cache flush. fDoFullFlush = (mode == FLUSH_STATE_ALWAYS) || fCacheLarge || fCacheCritical || fPeriodicFlush || fFlushForPrune; // Write blocks and block index to disk. if (fDoFullFlush || fPeriodicWrite) { // Depend on nMinDiskSpace to ensure we can write block index if (!CheckDiskSpace(0)) { return state.Error("out of disk space"); } // First make sure all block and undo data is flushed to disk. FlushBlockFile(); // Then update all block file information (which may refer to // block and undo files). { std::vector> vFiles; vFiles.reserve(setDirtyFileInfo.size()); for (int i : setDirtyFileInfo) { vFiles.push_back(std::make_pair(i, &vinfoBlockFile[i])); } setDirtyFileInfo.clear(); std::vector vBlocks; vBlocks.reserve(setDirtyBlockIndex.size()); for (const CBlockIndex *cbi : setDirtyBlockIndex) { vBlocks.push_back(cbi); } setDirtyBlockIndex.clear(); if (!pblocktree->WriteBatchSync(vFiles, nLastBlockFile, vBlocks)) { return AbortNode( state, "Failed to write to block index database"); } } // Finally remove any pruned files if (fFlushForPrune) { UnlinkPrunedFiles(setFilesToPrune); } nLastWrite = nNow; } // Flush best chain related state. This can only be done if the // blocks / block index write was also done. if (fDoFullFlush) { // Typical Coin structures on disk are around 48 bytes in size. // Pushing a new one to the database can cause it to be written // twice (once in the log, and once in the tables). This is // already an overestimation, as most will delete an existing // entry or overwrite one. Still, use a conservative safety // factor of 2. if (!CheckDiskSpace(48 * 2 * 2 * pcoinsTip->GetCacheSize())) { return state.Error("out of disk space"); } // Flush the chainstate (which may refer to block index // entries). if (!pcoinsTip->Flush()) { return AbortNode(state, "Failed to write to coin database"); } nLastFlush = nNow; } } if (fDoFullFlush || ((mode == FLUSH_STATE_ALWAYS || mode == FLUSH_STATE_PERIODIC) && nNow > nLastSetChain + (int64_t)DATABASE_WRITE_INTERVAL * 1000000)) { // Update best block in wallet (so we can detect restored wallets). GetMainSignals().SetBestChain(chainActive.GetLocator()); nLastSetChain = nNow; } } catch (const std::runtime_error &e) { return AbortNode( state, std::string("System error while flushing: ") + e.what()); } return true; } void FlushStateToDisk() { CValidationState state; const CChainParams &chainparams = Params(); FlushStateToDisk(chainparams, state, FLUSH_STATE_ALWAYS); } void PruneAndFlush() { CValidationState state; fCheckForPruning = true; const CChainParams &chainparams = Params(); FlushStateToDisk(chainparams, state, FLUSH_STATE_NONE); } /** * Update chainActive and related internal data structures when adding a new * block to the chain tip. */ static void UpdateTip(const Config &config, CBlockIndex *pindexNew) { const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); chainActive.SetTip(pindexNew); // New best block mempool.AddTransactionsUpdated(1); cvBlockChange.notify_all(); static bool fWarned = false; std::vector warningMessages; if (!IsInitialBlockDownload()) { int nUpgraded = 0; const CBlockIndex *pindex = chainActive.Tip(); // Check the version of the last 100 blocks to see if we need to // upgrade: for (int i = 0; i < 100 && pindex != nullptr; i++) { int32_t nExpectedVersion = ComputeBlockVersion(pindex->pprev, consensusParams); if (pindex->nVersion > VERSIONBITS_LAST_OLD_BLOCK_VERSION && (pindex->nVersion & ~nExpectedVersion) != 0) { ++nUpgraded; } pindex = pindex->pprev; } if (nUpgraded > 0) { warningMessages.push_back(strprintf( "%d of last 100 blocks have unexpected version", nUpgraded)); } if (nUpgraded > 100 / 2) { std::string strWarning = _("Warning: Unknown block versions being mined! It's possible " "unknown rules are in effect"); // notify GetWarnings(), called by Qt and the JSON-RPC code to warn // the user: SetMiscWarning(strWarning); if (!fWarned) { AlertNotify(strWarning); fWarned = true; } } } LogPrintf("%s: new best=%s height=%d version=0x%08x log2_work=%.8g tx=%lu " "date='%s' progress=%f cache=%.1fMiB(%utxo)", __func__, chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(), chainActive.Tip()->nVersion, log(chainActive.Tip()->nChainWork.getdouble()) / log(2.0), (unsigned long)chainActive.Tip()->nChainTx, DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()), GuessVerificationProgress(config.GetChainParams().TxData(), chainActive.Tip()), pcoinsTip->DynamicMemoryUsage() * (1.0 / (1 << 20)), pcoinsTip->GetCacheSize()); if (!warningMessages.empty()) { LogPrintf(" warning='%s'", boost::algorithm::join(warningMessages, ", ")); } LogPrintf("\n"); } /** * Disconnect chainActive's tip. * After calling, the mempool will be in an inconsistent state, with * transactions from disconnected blocks being added to disconnectpool. You * should make the mempool consistent again by calling updateMempoolForReorg. * with cs_main held. * * If disconnectpool is nullptr, then no disconnected transactions are added to * disconnectpool (note that the caller is responsible for mempool consistency * in any case). */ static bool DisconnectTip(const Config &config, CValidationState &state, DisconnectedBlockTransactions *disconnectpool) { CBlockIndex *pindexDelete = chainActive.Tip(); assert(pindexDelete); // Read block from disk. std::shared_ptr pblock = std::make_shared(); CBlock &block = *pblock; if (!ReadBlockFromDisk(block, pindexDelete, config)) { return AbortNode(state, "Failed to read block"); } // Apply the block atomically to the chain state. int64_t nStart = GetTimeMicros(); { CCoinsViewCache view(pcoinsTip); assert(view.GetBestBlock() == pindexDelete->GetBlockHash()); if (DisconnectBlock(block, pindexDelete, view) != DISCONNECT_OK) { return error("DisconnectTip(): DisconnectBlock %s failed", pindexDelete->GetBlockHash().ToString()); } bool flushed = view.Flush(); assert(flushed); } LogPrint(BCLog::BENCH, "- Disconnect block: %.2fms\n", (GetTimeMicros() - nStart) * 0.001); // Write the chain state to disk, if necessary. if (!FlushStateToDisk(config.GetChainParams(), state, FLUSH_STATE_IF_NEEDED)) { return false; } // If this block was deactivating the replay protection, then we need to // remove transactions that are replay protected from the mempool. There is // no easy way to do this so we'll just discard the whole mempool and then // add the transaction of the block we just disconnected back. // // If we are deactivating Magnetic anomaly, we want to make sure we do not // have transactions in the mempool that use newly introduced opcodes. As a // result, we also cleanup the mempool. if ((IsReplayProtectionEnabled(config, pindexDelete) && !IsReplayProtectionEnabled(config, pindexDelete->pprev)) || (IsMagneticAnomalyEnabled(config, pindexDelete) && !IsMagneticAnomalyEnabled(config, pindexDelete->pprev))) { LogPrint(BCLog::MEMPOOL, "Clearing mempool for reorg"); mempool.clear(); // While not strictly necessary, clearing the disconnect pool is also // beneficial so we don't try to reuse its content at the end of the // reorg, which we know will fail. if (disconnectpool) { disconnectpool->clear(); } } if (disconnectpool) { disconnectpool->addForBlock(block.vtx); } // Update chainActive and related variables. UpdateTip(config, pindexDelete->pprev); // Let wallets know transactions went from 1-confirmed to // 0-confirmed or conflicted: GetMainSignals().BlockDisconnected(pblock); return true; } static int64_t nTimeReadFromDisk = 0; static int64_t nTimeConnectTotal = 0; static int64_t nTimeFlush = 0; static int64_t nTimeChainState = 0; static int64_t nTimePostConnect = 0; struct PerBlockConnectTrace { CBlockIndex *pindex = nullptr; std::shared_ptr pblock; std::shared_ptr> conflictedTxs; PerBlockConnectTrace() : conflictedTxs(std::make_shared>()) {} }; /** * Used to track blocks whose transactions were applied to the UTXO state as a * part of a single ActivateBestChainStep call. * * This class also tracks transactions that are removed from the mempool as * conflicts (per block) and can be used to pass all those transactions through * SyncTransaction. * * This class assumes (and asserts) that the conflicted transactions for a given * block are added via mempool callbacks prior to the BlockConnected() * associated with those transactions. If any transactions are marked * conflicted, it is assumed that an associated block will always be added. * * This class is single-use, once you call GetBlocksConnected() you have to * throw it away and make a new one. */ class ConnectTrace { private: std::vector blocksConnected; CTxMemPool &pool; public: ConnectTrace(CTxMemPool &_pool) : blocksConnected(1), pool(_pool) { pool.NotifyEntryRemoved.connect( boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2)); } ~ConnectTrace() { pool.NotifyEntryRemoved.disconnect( boost::bind(&ConnectTrace::NotifyEntryRemoved, this, _1, _2)); } void BlockConnected(CBlockIndex *pindex, std::shared_ptr pblock) { assert(!blocksConnected.back().pindex); assert(pindex); assert(pblock); blocksConnected.back().pindex = pindex; blocksConnected.back().pblock = std::move(pblock); blocksConnected.emplace_back(); } std::vector &GetBlocksConnected() { // We always keep one extra block at the end of our list because blocks // are added after all the conflicted transactions have been filled in. // Thus, the last entry should always be an empty one waiting for the // transactions from the next block. We pop the last entry here to make // sure the list we return is sane. assert(!blocksConnected.back().pindex); assert(blocksConnected.back().conflictedTxs->empty()); blocksConnected.pop_back(); return blocksConnected; } void NotifyEntryRemoved(CTransactionRef txRemoved, MemPoolRemovalReason reason) { assert(!blocksConnected.back().pindex); if (reason == MemPoolRemovalReason::CONFLICT) { blocksConnected.back().conflictedTxs->emplace_back( std::move(txRemoved)); } } }; /** * Connect a new block to chainActive. pblock is either nullptr or a pointer to * a CBlock corresponding to pindexNew, to bypass loading it again from disk. * * The block is always added to connectTrace (either after loading from disk or * by copying pblock) - if that is not intended, care must be taken to remove * the last entry in blocksConnected in case of failure. */ static bool ConnectTip(const Config &config, CValidationState &state, CBlockIndex *pindexNew, const std::shared_ptr &pblock, ConnectTrace &connectTrace, DisconnectedBlockTransactions &disconnectpool) { assert(pindexNew->pprev == chainActive.Tip()); // Read block from disk. int64_t nTime1 = GetTimeMicros(); std::shared_ptr pthisBlock; if (!pblock) { std::shared_ptr pblockNew = std::make_shared(); if (!ReadBlockFromDisk(*pblockNew, pindexNew, config)) { return AbortNode(state, "Failed to read block"); } pthisBlock = pblockNew; } else { pthisBlock = pblock; } const CBlock &blockConnecting = *pthisBlock; // Apply the block atomically to the chain state. int64_t nTime2 = GetTimeMicros(); nTimeReadFromDisk += nTime2 - nTime1; int64_t nTime3; LogPrint(BCLog::BENCH, " - Load block from disk: %.2fms [%.2fs]\n", (nTime2 - nTime1) * 0.001, nTimeReadFromDisk * 0.000001); { CCoinsViewCache view(pcoinsTip); bool rv = ConnectBlock(config, blockConnecting, state, pindexNew, view); GetMainSignals().BlockChecked(blockConnecting, state); if (!rv) { if (state.IsInvalid()) { InvalidBlockFound(pindexNew, state); } return error("ConnectTip(): ConnectBlock %s failed (%s)", pindexNew->GetBlockHash().ToString(), FormatStateMessage(state)); } nTime3 = GetTimeMicros(); nTimeConnectTotal += nTime3 - nTime2; LogPrint(BCLog::BENCH, " - Connect total: %.2fms [%.2fs]\n", (nTime3 - nTime2) * 0.001, nTimeConnectTotal * 0.000001); bool flushed = view.Flush(); assert(flushed); } int64_t nTime4 = GetTimeMicros(); nTimeFlush += nTime4 - nTime3; LogPrint(BCLog::BENCH, " - Flush: %.2fms [%.2fs]\n", (nTime4 - nTime3) * 0.001, nTimeFlush * 0.000001); // Write the chain state to disk, if necessary. if (!FlushStateToDisk(config.GetChainParams(), state, FLUSH_STATE_IF_NEEDED)) { return false; } int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4; LogPrint(BCLog::BENCH, " - Writing chainstate: %.2fms [%.2fs]\n", (nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001); // Remove conflicting transactions from the mempool.; mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight); disconnectpool.removeForBlock(blockConnecting.vtx); // Update chainActive & related variables. UpdateTip(config, pindexNew); int64_t nTime6 = GetTimeMicros(); nTimePostConnect += nTime6 - nTime5; nTimeTotal += nTime6 - nTime1; LogPrint(BCLog::BENCH, " - Connect postprocess: %.2fms [%.2fs]\n", (nTime6 - nTime5) * 0.001, nTimePostConnect * 0.000001); LogPrint(BCLog::BENCH, "- Connect block: %.2fms [%.2fs]\n", (nTime6 - nTime1) * 0.001, nTimeTotal * 0.000001); connectTrace.BlockConnected(pindexNew, std::move(pthisBlock)); return true; } /** * Return the tip of the chain with the most work in it, that isn't known to be * invalid (it's however far from certain to be valid). */ static CBlockIndex *FindMostWorkChain() { do { CBlockIndex *pindexNew = nullptr; // Find the best candidate header. { std::set::reverse_iterator it = setBlockIndexCandidates.rbegin(); if (it == setBlockIndexCandidates.rend()) { return nullptr; } pindexNew = *it; } // Check whether all blocks on the path between the currently active // chain and the candidate are valid. Just going until the active chain // is an optimization, as we know all blocks in it are valid already. CBlockIndex *pindexTest = pindexNew; bool fInvalidAncestor = false; while (pindexTest && !chainActive.Contains(pindexTest)) { assert(pindexTest->nChainTx || pindexTest->nHeight == 0); // Pruned nodes may have entries in setBlockIndexCandidates for // which block files have been deleted. Remove those as candidates // for the most work chain if we come across them; we can't switch // to a chain unless we have all the non-active-chain parent blocks. bool fInvalidChain = pindexTest->nStatus.isInvalid(); bool fParkedChain = pindexTest->nStatus.isOnParkedChain(); bool fMissingData = !pindexTest->nStatus.hasData(); if (fInvalidChain || fParkedChain || fMissingData) { // Candidate chain is not usable (either invalid or missing // data) if (fInvalidChain && (pindexBestInvalid == nullptr || pindexNew->nChainWork > pindexBestInvalid->nChainWork)) { pindexBestInvalid = pindexNew; } CBlockIndex *pindexFailed = pindexNew; // Remove the entire chain from the set. while (pindexTest != pindexFailed) { if (fInvalidChain || fParkedChain) { pindexFailed->nStatus = pindexFailed->nStatus .withFailedParent(fInvalidChain) .withParkedParent(fParkedChain); } else if (fMissingData) { // If we're missing data, then add back to // mapBlocksUnlinked, so that if the block arrives in // the future we can try adding to // setBlockIndexCandidates again. mapBlocksUnlinked.insert( std::make_pair(pindexFailed->pprev, pindexFailed)); } setBlockIndexCandidates.erase(pindexFailed); pindexFailed = pindexFailed->pprev; } setBlockIndexCandidates.erase(pindexTest); fInvalidAncestor = true; break; } pindexTest = pindexTest->pprev; } if (!fInvalidAncestor) { return pindexNew; } } while (true); } /** * Delete all entries in setBlockIndexCandidates that are worse than the current * tip. */ static void PruneBlockIndexCandidates() { // Note that we can't delete the current block itself, as we may need to // return to it later in case a reorganization to a better block fails. std::set::iterator it = setBlockIndexCandidates.begin(); while (it != setBlockIndexCandidates.end() && setBlockIndexCandidates.value_comp()(*it, chainActive.Tip())) { setBlockIndexCandidates.erase(it++); } // Either the current tip or a successor of it we're working towards is left // in setBlockIndexCandidates. assert(!setBlockIndexCandidates.empty()); } /** * Try to make some progress towards making pindexMostWork the active block. * pblock is either nullptr or a pointer to a CBlock corresponding to * pindexMostWork. */ static bool ActivateBestChainStep(const Config &config, CValidationState &state, CBlockIndex *pindexMostWork, const std::shared_ptr &pblock, bool &fInvalidFound, ConnectTrace &connectTrace) { AssertLockHeld(cs_main); const CBlockIndex *pindexOldTip = chainActive.Tip(); const CBlockIndex *pindexFork = chainActive.FindFork(pindexMostWork); // Disconnect active blocks which are no longer in the best chain. bool fBlocksDisconnected = false; DisconnectedBlockTransactions disconnectpool; while (chainActive.Tip() && chainActive.Tip() != pindexFork) { if (!DisconnectTip(config, state, &disconnectpool)) { // This is likely a fatal error, but keep the mempool consistent, // just in case. Only remove from the mempool in this case. disconnectpool.updateMempoolForReorg(config, false); return false; } fBlocksDisconnected = true; } // Build list of new blocks to connect. std::vector vpindexToConnect; bool fContinue = true; int nHeight = pindexFork ? pindexFork->nHeight : -1; while (fContinue && nHeight != pindexMostWork->nHeight) { // Don't iterate the entire list of potential improvements toward the // best tip, as we likely only need a few blocks along the way. int nTargetHeight = std::min(nHeight + 32, pindexMostWork->nHeight); vpindexToConnect.clear(); vpindexToConnect.reserve(nTargetHeight - nHeight); CBlockIndex *pindexIter = pindexMostWork->GetAncestor(nTargetHeight); while (pindexIter && pindexIter->nHeight != nHeight) { vpindexToConnect.push_back(pindexIter); pindexIter = pindexIter->pprev; } nHeight = nTargetHeight; // Connect new blocks. for (CBlockIndex *pindexConnect : boost::adaptors::reverse(vpindexToConnect)) { if (!ConnectTip(config, state, pindexConnect, pindexConnect == pindexMostWork ? pblock : std::shared_ptr(), connectTrace, disconnectpool)) { if (state.IsInvalid()) { // The block violates a consensus rule. if (!state.CorruptionPossible()) { InvalidChainFound(vpindexToConnect.back()); } state = CValidationState(); fInvalidFound = true; fContinue = false; break; } // A system error occurred (disk space, database error, ...). // Make the mempool consistent with the current tip, just in // case any observers try to use it before shutdown. disconnectpool.updateMempoolForReorg(config, false); return false; } else { PruneBlockIndexCandidates(); if (!pindexOldTip || chainActive.Tip()->nChainWork > pindexOldTip->nChainWork) { // We're in a better position than we were. Return // temporarily to release the lock. fContinue = false; break; } } } } if (fBlocksDisconnected) { // If any blocks were disconnected, disconnectpool may be non empty. Add // any disconnected transactions back to the mempool. disconnectpool.updateMempoolForReorg(config, true); } mempool.check(pcoinsTip); // Callbacks/notifications for a new best chain. if (fInvalidFound) { CheckForkWarningConditionsOnNewFork(vpindexToConnect.back()); } else { CheckForkWarningConditions(); } return true; } static void NotifyHeaderTip() { bool fNotify = false; bool fInitialBlockDownload = false; static CBlockIndex *pindexHeaderOld = nullptr; CBlockIndex *pindexHeader = nullptr; { LOCK(cs_main); pindexHeader = pindexBestHeader; if (pindexHeader != pindexHeaderOld) { fNotify = true; fInitialBlockDownload = IsInitialBlockDownload(); pindexHeaderOld = pindexHeader; } } // Send block tip changed notifications without cs_main if (fNotify) { uiInterface.NotifyHeaderTip(fInitialBlockDownload, pindexHeader); } } bool ActivateBestChain(const Config &config, CValidationState &state, std::shared_ptr pblock) { // Note that while we're often called here from ProcessNewBlock, this is // far from a guarantee. Things in the P2P/RPC will often end up calling // us in the middle of ProcessNewBlock - do not assume pblock is set // sanely for performance or correctness! CBlockIndex *pindexMostWork = nullptr; CBlockIndex *pindexNewTip = nullptr; do { boost::this_thread::interruption_point(); if (ShutdownRequested()) { break; } const CBlockIndex *pindexFork; bool fInitialDownload; { LOCK(cs_main); // Destructed before cs_main is unlocked. ConnectTrace connectTrace(mempool); CBlockIndex *pindexOldTip = chainActive.Tip(); if (pindexMostWork == nullptr) { pindexMostWork = FindMostWorkChain(); } // Whether we have anything to do at all. if (pindexMostWork == nullptr || pindexMostWork == chainActive.Tip()) { return true; } bool fInvalidFound = false; std::shared_ptr nullBlockPtr; if (!ActivateBestChainStep( config, state, pindexMostWork, pblock && pblock->GetHash() == pindexMostWork->GetBlockHash() ? pblock : nullBlockPtr, fInvalidFound, connectTrace)) { return false; } if (fInvalidFound) { // Wipe cache, we may need another branch now. pindexMostWork = nullptr; } pindexNewTip = chainActive.Tip(); pindexFork = chainActive.FindFork(pindexOldTip); fInitialDownload = IsInitialBlockDownload(); for (const PerBlockConnectTrace &trace : connectTrace.GetBlocksConnected()) { assert(trace.pblock && trace.pindex); GetMainSignals().BlockConnected(trace.pblock, trace.pindex, *trace.conflictedTxs); } } // When we reach this point, we switched to a new tip (stored in // pindexNewTip). // Notifications/callbacks that can run without cs_main // Notify external listeners about the new tip. GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork, fInitialDownload); // Always notify the UI if a new block tip was connected if (pindexFork != pindexNewTip) { uiInterface.NotifyBlockTip(fInitialDownload, pindexNewTip); } } while (pindexNewTip != pindexMostWork); const CChainParams ¶ms = config.GetChainParams(); CheckBlockIndex(params.GetConsensus()); // Write changes periodically to disk, after relay. if (!FlushStateToDisk(params, state, FLUSH_STATE_PERIODIC)) { return false; } int nStopAtHeight = gArgs.GetArg("-stopatheight", DEFAULT_STOPATHEIGHT); if (nStopAtHeight && pindexNewTip && pindexNewTip->nHeight >= nStopAtHeight) { StartShutdown(); } return true; } bool PreciousBlock(const Config &config, CValidationState &state, CBlockIndex *pindex) { { LOCK(cs_main); if (pindex->nChainWork < chainActive.Tip()->nChainWork) { // Nothing to do, this block is not at the tip. return true; } if (chainActive.Tip()->nChainWork > nLastPreciousChainwork) { // The chain has been extended since the last call, reset the // counter. nBlockReverseSequenceId = -1; } nLastPreciousChainwork = chainActive.Tip()->nChainWork; setBlockIndexCandidates.erase(pindex); pindex->nSequenceId = nBlockReverseSequenceId; if (nBlockReverseSequenceId > std::numeric_limits::min()) { // We can't keep reducing the counter if somebody really wants to // call preciousblock 2**31-1 times on the same set of tips... nBlockReverseSequenceId--; } if (pindex->IsValid(BlockValidity::TRANSACTIONS) && pindex->nChainTx) { setBlockIndexCandidates.insert(pindex); PruneBlockIndexCandidates(); } } return ActivateBestChain(config, state); } bool InvalidateBlock(const Config &config, CValidationState &state, CBlockIndex *pindex) { AssertLockHeld(cs_main); // Mark the block itself as invalid. pindex->nStatus = pindex->nStatus.withFailed(); setDirtyBlockIndex.insert(pindex); setBlockIndexCandidates.erase(pindex); DisconnectedBlockTransactions disconnectpool; while (chainActive.Contains(pindex)) { CBlockIndex *pindexWalk = chainActive.Tip(); pindexWalk->nStatus = pindexWalk->nStatus.withFailedParent(); setDirtyBlockIndex.insert(pindexWalk); setBlockIndexCandidates.erase(pindexWalk); // ActivateBestChain considers blocks already in chainActive // unconditionally valid already, so force disconnect away from it. if (!DisconnectTip(config, state, &disconnectpool)) { // It's probably hopeless to try to make the mempool consistent // here if DisconnectTip failed, but we can try. disconnectpool.updateMempoolForReorg(config, false); return false; } } // DisconnectTip will add transactions to disconnectpool; try to add these // back to the mempool. disconnectpool.updateMempoolForReorg(config, true); // The resulting new best tip may not be in setBlockIndexCandidates anymore, // so add it again. for (const std::pair &it : mapBlockIndex) { CBlockIndex *i = it.second; if (i->IsValid(BlockValidity::TRANSACTIONS) && i->nChainTx && !setBlockIndexCandidates.value_comp()(i, chainActive.Tip())) { setBlockIndexCandidates.insert(i); } } InvalidChainFound(pindex); uiInterface.NotifyBlockTip(IsInitialBlockDownload(), pindex->pprev); return true; } bool ResetBlockFailureFlags(CBlockIndex *pindex) { AssertLockHeld(cs_main); int nHeight = pindex->nHeight; // Remove the invalidity flag from this block and all its descendants. BlockMap::iterator it = mapBlockIndex.begin(); while (it != mapBlockIndex.end()) { if (!it->second->IsValid() && it->second->GetAncestor(nHeight) == pindex) { it->second->nStatus = it->second->nStatus.withClearedFailureFlags(); setDirtyBlockIndex.insert(it->second); if (it->second->IsValid(BlockValidity::TRANSACTIONS) && it->second->nChainTx && setBlockIndexCandidates.value_comp()(chainActive.Tip(), it->second)) { setBlockIndexCandidates.insert(it->second); } if (it->second == pindexBestInvalid) { // Reset invalid block marker if it was pointing to one of // those. pindexBestInvalid = nullptr; } } it++; } // Remove the invalidity flag from all ancestors too. while (pindex != nullptr) { if (pindex->nStatus.isInvalid()) { pindex->nStatus = pindex->nStatus.withClearedFailureFlags(); setDirtyBlockIndex.insert(pindex); } pindex = pindex->pprev; } return true; } static CBlockIndex *AddToBlockIndex(const CBlockHeader &block) { // Check for duplicate uint256 hash = block.GetHash(); BlockMap::iterator it = mapBlockIndex.find(hash); if (it != mapBlockIndex.end()) { return it->second; } // Construct new block index object CBlockIndex *pindexNew = new CBlockIndex(block); assert(pindexNew); // We assign the sequence id to blocks only when the full data is available, // to avoid miners withholding blocks but broadcasting headers, to get a // competitive advantage. pindexNew->nSequenceId = 0; BlockMap::iterator mi = mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first; pindexNew->phashBlock = &((*mi).first); BlockMap::iterator miPrev = mapBlockIndex.find(block.hashPrevBlock); if (miPrev != mapBlockIndex.end()) { pindexNew->pprev = (*miPrev).second; pindexNew->nHeight = pindexNew->pprev->nHeight + 1; pindexNew->BuildSkip(); } pindexNew->nTimeReceived = GetTime(); pindexNew->nTimeMax = (pindexNew->pprev ? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime) : pindexNew->nTime); pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + GetBlockProof(*pindexNew); pindexNew->RaiseValidity(BlockValidity::TREE); if (pindexBestHeader == nullptr || pindexBestHeader->nChainWork < pindexNew->nChainWork) { pindexBestHeader = pindexNew; } setDirtyBlockIndex.insert(pindexNew); return pindexNew; } /** * Mark a block as having its data received and checked (up to * BLOCK_VALID_TRANSACTIONS). */ bool ReceivedBlockTransactions(const CBlock &block, CValidationState &state, CBlockIndex *pindexNew, const CDiskBlockPos &pos) { pindexNew->nTx = block.vtx.size(); pindexNew->nChainTx = 0; pindexNew->nFile = pos.nFile; pindexNew->nDataPos = pos.nPos; pindexNew->nUndoPos = 0; pindexNew->nStatus = pindexNew->nStatus.withData(); pindexNew->RaiseValidity(BlockValidity::TRANSACTIONS); setDirtyBlockIndex.insert(pindexNew); if (pindexNew->pprev == nullptr || pindexNew->pprev->nChainTx) { // If pindexNew is the genesis block or all parents are // BLOCK_VALID_TRANSACTIONS. std::deque queue; queue.push_back(pindexNew); // Recursively process any descendant blocks that now may be eligible to // be connected. while (!queue.empty()) { CBlockIndex *pindex = queue.front(); queue.pop_front(); pindex->nChainTx = (pindex->pprev ? pindex->pprev->nChainTx : 0) + pindex->nTx; { LOCK(cs_nBlockSequenceId); pindex->nSequenceId = nBlockSequenceId++; } if (chainActive.Tip() == nullptr || !setBlockIndexCandidates.value_comp()(pindex, chainActive.Tip())) { setBlockIndexCandidates.insert(pindex); } std::pair::iterator, std::multimap::iterator> range = mapBlocksUnlinked.equal_range(pindex); while (range.first != range.second) { std::multimap::iterator it = range.first; queue.push_back(it->second); range.first++; mapBlocksUnlinked.erase(it); } } } else if (pindexNew->pprev && pindexNew->pprev->IsValid(BlockValidity::TREE)) { mapBlocksUnlinked.insert(std::make_pair(pindexNew->pprev, pindexNew)); } return true; } static bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos, unsigned int nAddSize, unsigned int nHeight, uint64_t nTime, bool fKnown = false) { LOCK(cs_LastBlockFile); unsigned int nFile = fKnown ? pos.nFile : nLastBlockFile; if (vinfoBlockFile.size() <= nFile) { vinfoBlockFile.resize(nFile + 1); } if (!fKnown) { while (vinfoBlockFile[nFile].nSize + nAddSize >= MAX_BLOCKFILE_SIZE) { nFile++; if (vinfoBlockFile.size() <= nFile) { vinfoBlockFile.resize(nFile + 1); } } pos.nFile = nFile; pos.nPos = vinfoBlockFile[nFile].nSize; } if ((int)nFile != nLastBlockFile) { if (!fKnown) { LogPrintf("Leaving block file %i: %s\n", nLastBlockFile, vinfoBlockFile[nLastBlockFile].ToString()); } FlushBlockFile(!fKnown); nLastBlockFile = nFile; } vinfoBlockFile[nFile].AddBlock(nHeight, nTime); if (fKnown) { vinfoBlockFile[nFile].nSize = std::max(pos.nPos + nAddSize, vinfoBlockFile[nFile].nSize); } else { vinfoBlockFile[nFile].nSize += nAddSize; } if (!fKnown) { unsigned int nOldChunks = (pos.nPos + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE; unsigned int nNewChunks = (vinfoBlockFile[nFile].nSize + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE; if (nNewChunks > nOldChunks) { if (fPruneMode) { fCheckForPruning = true; } if (CheckDiskSpace(nNewChunks * BLOCKFILE_CHUNK_SIZE - pos.nPos)) { FILE *file = OpenBlockFile(pos); if (file) { LogPrintf( "Pre-allocating up to position 0x%x in blk%05u.dat\n", nNewChunks * BLOCKFILE_CHUNK_SIZE, pos.nFile); AllocateFileRange(file, pos.nPos, nNewChunks * BLOCKFILE_CHUNK_SIZE - pos.nPos); fclose(file); } } else { return state.Error("out of disk space"); } } } setDirtyFileInfo.insert(nFile); return true; } static bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigned int nAddSize) { pos.nFile = nFile; LOCK(cs_LastBlockFile); unsigned int nNewSize; pos.nPos = vinfoBlockFile[nFile].nUndoSize; nNewSize = vinfoBlockFile[nFile].nUndoSize += nAddSize; setDirtyFileInfo.insert(nFile); unsigned int nOldChunks = (pos.nPos + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE; unsigned int nNewChunks = (nNewSize + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE; if (nNewChunks > nOldChunks) { if (fPruneMode) { fCheckForPruning = true; } if (CheckDiskSpace(nNewChunks * UNDOFILE_CHUNK_SIZE - pos.nPos)) { FILE *file = OpenUndoFile(pos); if (file) { LogPrintf("Pre-allocating up to position 0x%x in rev%05u.dat\n", nNewChunks * UNDOFILE_CHUNK_SIZE, pos.nFile); AllocateFileRange(file, pos.nPos, nNewChunks * UNDOFILE_CHUNK_SIZE - pos.nPos); fclose(file); } } else { return state.Error("out of disk space"); } } return true; } /** * Return true if the provided block header is valid. * Only verify PoW if blockValidationOptions is configured to do so. * This allows validation of headers on which the PoW hasn't been done. * For example: to validate template handed to mining software. * Do not call this for any check that depends on the context. * For context-dependant calls, see ContextualCheckBlockHeader. */ static bool CheckBlockHeader( const Config &config, const CBlockHeader &block, CValidationState &state, BlockValidationOptions validationOptions = BlockValidationOptions()) { // Check proof of work matches claimed amount if (validationOptions.shouldValidatePoW() && !CheckProofOfWork(block.GetHash(), block.nBits, config)) { return state.DoS(50, false, REJECT_INVALID, "high-hash", false, "proof of work failed"); } return true; } bool CheckBlock(const Config &config, const CBlock &block, CValidationState &state, BlockValidationOptions validationOptions) { // These are checks that are independent of context. if (block.fChecked) { return true; } // Check that the header is valid (particularly PoW). This is mostly // redundant with the call in AcceptBlockHeader. if (!CheckBlockHeader(config, block, state, validationOptions)) { return false; } // Check the merkle root. if (validationOptions.shouldValidateMerkleRoot()) { bool mutated; uint256 hashMerkleRoot2 = BlockMerkleRoot(block, &mutated); if (block.hashMerkleRoot != hashMerkleRoot2) { return state.DoS(100, false, REJECT_INVALID, "bad-txnmrklroot", true, "hashMerkleRoot mismatch"); } // Check for merkle tree malleability (CVE-2012-2459): repeating // sequences of transactions in a block without affecting the merkle // root of a block, while still invalidating it. if (mutated) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-duplicate", true, "duplicate transaction"); } } // All potential-corruption validation must be done before we do any // transaction validation, as otherwise we may mark the header as invalid // because we receive the wrong transactions for it. // First transaction must be coinbase. if (block.vtx.empty()) { return state.DoS(100, false, REJECT_INVALID, "bad-cb-missing", false, "first tx is not coinbase"); } // Size limits. auto nMaxBlockSize = config.GetMaxBlockSize(); // Bail early if there is no way this block is of reasonable size. if ((block.vtx.size() * MIN_TRANSACTION_SIZE) > nMaxBlockSize) { return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false, "size limits failed"); } auto currentBlockSize = ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION); if (currentBlockSize > nMaxBlockSize) { return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false, "size limits failed"); } // And a valid coinbase. if (!CheckCoinbase(*block.vtx[0], state, false)) { return state.Invalid(false, state.GetRejectCode(), state.GetRejectReason(), strprintf("Coinbase check failed (txid %s) %s", block.vtx[0]->GetId().ToString(), state.GetDebugMessage())); } // Keep track of the sigops count. uint64_t nSigOps = 0; auto nMaxSigOpsCount = GetMaxBlockSigOpsCount(currentBlockSize); // Check transactions auto txCount = block.vtx.size(); auto *tx = block.vtx[0].get(); size_t i = 0; while (true) { // Count the sigops for the current transaction. If the total sigops // count is too high, the the block is invalid. nSigOps += GetSigOpCountWithoutP2SH(*tx, STANDARD_SCRIPT_VERIFY_FLAGS); if (nSigOps > nMaxSigOpsCount) { return state.DoS(100, false, REJECT_INVALID, "bad-blk-sigops", false, "out-of-bounds SigOpCount"); } // Go to the next transaction. i++; // We reached the end of the block, success. if (i >= txCount) { break; } // Check that the transaction is valid. because this check differs for // the coinbase, the loos is arranged such as this only runs after at // least one increment. tx = block.vtx[i].get(); if (!CheckRegularTransaction(*tx, state, false)) { return state.Invalid( false, state.GetRejectCode(), state.GetRejectReason(), strprintf("Transaction check failed (txid %s) %s", tx->GetId().ToString(), state.GetDebugMessage())); } } if (validationOptions.shouldValidatePoW() && validationOptions.shouldValidateMerkleRoot()) { block.fChecked = true; } return true; } static bool CheckIndexAgainstCheckpoint(const CBlockIndex *pindexPrev, CValidationState &state, const CChainParams &chainparams, const uint256 &hash) { if (*pindexPrev->phashBlock == chainparams.GetConsensus().hashGenesisBlock) { return true; } int nHeight = pindexPrev->nHeight + 1; const CCheckpointData &checkpoints = chainparams.Checkpoints(); // Check that the block chain matches the known block chain up to a // checkpoint. if (!Checkpoints::CheckBlock(checkpoints, nHeight, hash)) { return state.DoS(100, error("%s: rejected by checkpoint lock-in at %d", __func__, nHeight), REJECT_CHECKPOINT, "checkpoint mismatch"); } // Don't accept any forks from the main chain prior to last checkpoint. // GetLastCheckpoint finds the last checkpoint in MapCheckpoints that's in // our MapBlockIndex. CBlockIndex *pcheckpoint = Checkpoints::GetLastCheckpoint(checkpoints); if (pcheckpoint && nHeight < pcheckpoint->nHeight) { return state.DoS( 100, error("%s: forked chain older than last checkpoint (height %d)", __func__, nHeight), REJECT_CHECKPOINT, "bad-fork-prior-to-checkpoint"); } return true; } static bool ContextualCheckBlockHeader(const Config &config, const CBlockHeader &block, CValidationState &state, const CBlockIndex *pindexPrev, int64_t nAdjustedTime) { const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1; // Check proof of work if (block.nBits != GetNextWorkRequired(pindexPrev, &block, config)) { LogPrintf("bad bits after height: %d\n", pindexPrev->nHeight); return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false, "incorrect proof of work"); } // Check timestamp against prev if (block.GetBlockTime() <= pindexPrev->GetMedianTimePast()) { return state.Invalid(false, REJECT_INVALID, "time-too-old", "block's timestamp is too early"); } // Check timestamp if (block.GetBlockTime() > nAdjustedTime + MAX_FUTURE_BLOCK_TIME) { return state.Invalid(false, REJECT_INVALID, "time-too-new", "block timestamp too far in the future"); } // Reject outdated version blocks when 95% (75% on testnet) of the network // has upgraded: // check for version 2, 3 and 4 upgrades if ((block.nVersion < 2 && nHeight >= consensusParams.BIP34Height) || (block.nVersion < 3 && nHeight >= consensusParams.BIP66Height) || (block.nVersion < 4 && nHeight >= consensusParams.BIP65Height)) { return state.Invalid( false, REJECT_OBSOLETE, strprintf("bad-version(0x%08x)", block.nVersion), strprintf("rejected nVersion=0x%08x block", block.nVersion)); } return true; } bool ContextualCheckTransaction(const Config &config, const CTransaction &tx, CValidationState &state, int nHeight, int64_t nLockTimeCutoff, int64_t nMedianTimePast) { if (!IsFinalTx(tx, nHeight, nLockTimeCutoff)) { // While this is only one transaction, we use txns in the error to // ensure continuity with other clients. return state.DoS(10, false, REJECT_INVALID, "bad-txns-nonfinal", false, "non-final transaction"); } if (IsMagneticAnomalyEnabled(config, nMedianTimePast)) { // Size limit if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) < MIN_TX_SIZE) { return state.DoS(100, false, REJECT_INVALID, "bad-txns-undersize"); } } return true; } bool ContextualCheckTransactionForCurrentBlock(const Config &config, const CTransaction &tx, CValidationState &state, int flags) { AssertLockHeld(cs_main); // By convention a negative value for flags indicates that the current // network-enforced consensus rules should be used. In a future soft-fork // scenario that would mean checking which rules would be enforced for the // next block and setting the appropriate flags. At the present time no // soft-forks are scheduled, so no flags are set. flags = std::max(flags, 0); // ContextualCheckTransactionForCurrentBlock() uses chainActive.Height()+1 // to evaluate nLockTime because when IsFinalTx() is called within // CBlock::AcceptBlock(), the height of the block *being* evaluated is what // is used. Thus if we want to know if a transaction can be part of the // *next* block, we need to call ContextualCheckTransaction() with one more // than chainActive.Height(). const int nBlockHeight = chainActive.Height() + 1; // BIP113 will require that time-locked transactions have nLockTime set to // less than the median time of the previous block they're contained in. // When the next block is created its previous block will be the current // chain tip, so we use that to calculate the median time passed to // ContextualCheckTransaction() if LOCKTIME_MEDIAN_TIME_PAST is set. const int64_t nMedianTimePast = chainActive.Tip() == nullptr ? 0 : chainActive.Tip()->GetMedianTimePast(); const int64_t nLockTimeCutoff = (flags & LOCKTIME_MEDIAN_TIME_PAST) ? nMedianTimePast : GetAdjustedTime(); return ContextualCheckTransaction(config, tx, state, nBlockHeight, nLockTimeCutoff, nMedianTimePast); } static bool ContextualCheckBlock(const Config &config, const CBlock &block, CValidationState &state, const CBlockIndex *pindexPrev) { const int nHeight = pindexPrev == nullptr ? 0 : pindexPrev->nHeight + 1; const Consensus::Params &consensusParams = config.GetChainParams().GetConsensus(); // Start enforcing BIP113 (Median Time Past). int nLockTimeFlags = 0; if (nHeight >= consensusParams.CSVHeight) { nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST; } const int64_t nMedianTimePast = pindexPrev == nullptr ? 0 : pindexPrev->GetMedianTimePast(); const int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST) ? nMedianTimePast : block.GetBlockTime(); const bool fIsMagneticAnomalyEnabled = IsMagneticAnomalyEnabled(config, pindexPrev); // Check that all transactions are finalized const CTransaction *prevTx = nullptr; for (const auto &ptx : block.vtx) { const CTransaction &tx = *ptx; if (fIsMagneticAnomalyEnabled) { if (prevTx && (tx.GetId() < prevTx->GetId())) { return state.DoS( 100, false, REJECT_INVALID, "tx-ordering", false, strprintf("Transaction order is invalid (%s < %s)", tx.GetId().ToString(), prevTx->GetId().ToString())); } if (prevTx || !tx.IsCoinBase()) { prevTx = &tx; } } if (!ContextualCheckTransaction(config, tx, state, nHeight, nLockTimeCutoff, nMedianTimePast)) { // state set by ContextualCheckTransaction. return false; } } // Enforce rule that the coinbase starts with serialized block height if (nHeight >= consensusParams.BIP34Height) { CScript expect = CScript() << nHeight; if (block.vtx[0]->vin[0].scriptSig.size() < expect.size() || !std::equal(expect.begin(), expect.end(), block.vtx[0]->vin[0].scriptSig.begin())) { return state.DoS(100, false, REJECT_INVALID, "bad-cb-height", false, "block height mismatch in coinbase"); } } return true; } /** * If the provided block header is valid, add it to the block index. * * Returns true if the block is succesfully added to the block index. */ static bool AcceptBlockHeader(const Config &config, const CBlockHeader &block, CValidationState &state, CBlockIndex **ppindex) { AssertLockHeld(cs_main); const CChainParams &chainparams = config.GetChainParams(); // Check for duplicate uint256 hash = block.GetHash(); BlockMap::iterator miSelf = mapBlockIndex.find(hash); CBlockIndex *pindex = nullptr; if (hash != chainparams.GetConsensus().hashGenesisBlock) { if (miSelf != mapBlockIndex.end()) { // Block header is already known. pindex = miSelf->second; if (ppindex) { *ppindex = pindex; } if (pindex->nStatus.isInvalid()) { return state.Invalid(error("%s: block %s is marked invalid", __func__, hash.ToString()), 0, "duplicate"); } return true; } if (!CheckBlockHeader(config, block, state)) { return error("%s: Consensus::CheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state)); } // Get prev block index CBlockIndex *pindexPrev = nullptr; BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock); if (mi == mapBlockIndex.end()) { return state.DoS(10, error("%s: prev block not found", __func__), 0, "prev-blk-not-found"); } pindexPrev = (*mi).second; if (pindexPrev->nStatus.isInvalid()) { return state.DoS(100, error("%s: prev block invalid", __func__), REJECT_INVALID, "bad-prevblk"); } assert(pindexPrev); if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, hash)) { return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str()); } if (!ContextualCheckBlockHeader(config, block, state, pindexPrev, GetAdjustedTime())) { return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state)); } } if (pindex == nullptr) { pindex = AddToBlockIndex(block); } if (ppindex) { *ppindex = pindex; } CheckBlockIndex(chainparams.GetConsensus()); return true; } // Exposed wrapper for AcceptBlockHeader bool ProcessNewBlockHeaders(const Config &config, const std::vector &headers, CValidationState &state, const CBlockIndex **ppindex) { { LOCK(cs_main); for (const CBlockHeader &header : headers) { // Use a temp pindex instead of ppindex to avoid a const_cast CBlockIndex *pindex = nullptr; if (!AcceptBlockHeader(config, header, state, &pindex)) { return false; } if (ppindex) { *ppindex = pindex; } } } NotifyHeaderTip(); return true; } /** * Store a block on disk. * * @param[in] config The global config. * @param[in-out] pblock The block we want to accept. * @param[out] ppindex The last new block index, only set if the block * was accepted. * @param[in] fRequested A boolean to indicate if this block was requested * from our peers. * @param[in] dbp If non-null, the disk position of the block. * @param[in-out] fNewBlock True if block was first received via this call. * @return True if the block is accepted as a valid block and written to disk. */ static bool AcceptBlock(const Config &config, const std::shared_ptr &pblock, CValidationState &state, CBlockIndex **ppindex, bool fRequested, const CDiskBlockPos *dbp, bool *fNewBlock) { AssertLockHeld(cs_main); const CBlock &block = *pblock; if (fNewBlock) { *fNewBlock = false; } CBlockIndex *pindexDummy = nullptr; CBlockIndex *&pindex = ppindex ? *ppindex : pindexDummy; if (!AcceptBlockHeader(config, block, state, &pindex)) { return false; } // Try to process all requested blocks that we don't have, but only // process an unrequested block if it's new and has enough work to // advance our tip, and isn't too many blocks ahead. bool fAlreadyHave = pindex->nStatus.hasData(); // Compare block header timestamps and received times of the block and the // chaintip. If they have the same chain height, use these diffs as a // tie-breaker, attempting to pick the more honestly-mined block. int64_t newBlockTimeDiff = std::llabs(pindex->GetReceivedTimeDiff()); int64_t chainTipTimeDiff = chainActive.Tip() ? std::llabs(chainActive.Tip()->GetReceivedTimeDiff()) : 0; bool isSameHeight = chainActive.Tip() && (pindex->nChainWork == chainActive.Tip()->nChainWork); if (isSameHeight) { LogPrintf("Chain tip timestamp-to-received-time difference: hash=%s, " "diff=%d\n", chainActive.Tip()->GetBlockHash().ToString(), chainTipTimeDiff); LogPrintf("New block timestamp-to-received-time difference: hash=%s, " "diff=%d\n", pindex->GetBlockHash().ToString(), newBlockTimeDiff); } bool fHasMoreWork = (chainActive.Tip() ? pindex->nChainWork > chainActive.Tip()->nChainWork : true); // Blocks that are too out-of-order needlessly limit the effectiveness of // pruning, because pruning will not delete block files that contain any // blocks which are too close in height to the tip. Apply this test // regardless of whether pruning is enabled; it should generally be safe to // not process unrequested blocks. bool fTooFarAhead = (pindex->nHeight > int(chainActive.Height() + MIN_BLOCKS_TO_KEEP)); // TODO: Decouple this function from the block download logic by removing // fRequested // This requires some new chain datastructure to efficiently look up if a // block is in a chain leading to a candidate for best tip, despite not // being such a candidate itself. // TODO: deal better with return value and error conditions for duplicate // and unrequested blocks. if (fAlreadyHave) { return true; } // If we didn't ask for it: if (!fRequested) { // This is a previously-processed block that was pruned. if (pindex->nTx != 0) { return true; } // Don't process less-work chains. if (!fHasMoreWork) { return true; } // Block height is too high. if (fTooFarAhead) { return true; } } if (fNewBlock) { *fNewBlock = true; } if (!CheckBlock(config, block, state) || !ContextualCheckBlock(config, block, state, pindex->pprev)) { if (state.IsInvalid() && !state.CorruptionPossible()) { pindex->nStatus = pindex->nStatus.withFailed(); setDirtyBlockIndex.insert(pindex); } return error("%s: %s (block %s)", __func__, FormatStateMessage(state), block.GetHash().ToString()); } // Header is valid/has work and the merkle tree is good. // Relay now, but if it does not build on our best tip, let the // SendMessages loop relay it. if (!IsInitialBlockDownload() && chainActive.Tip() == pindex->pprev) { GetMainSignals().NewPoWValidBlock(pindex, pblock); } int nHeight = pindex->nHeight; const CChainParams &chainparams = config.GetChainParams(); // Write block to history file try { unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION); CDiskBlockPos blockPos; if (dbp != nullptr) { blockPos = *dbp; } if (!FindBlockPos(state, blockPos, nBlockSize + 8, nHeight, block.GetBlockTime(), dbp != nullptr)) { return error("AcceptBlock(): FindBlockPos failed"); } if (dbp == nullptr) { if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) { AbortNode(state, "Failed to write block"); } } if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) { return error("AcceptBlock(): ReceivedBlockTransactions failed"); } } catch (const std::runtime_error &e) { return AbortNode(state, std::string("System error: ") + e.what()); } if (fCheckForPruning) { // we just allocated more disk space for block files. FlushStateToDisk(config.GetChainParams(), state, FLUSH_STATE_NONE); } return true; } bool ProcessNewBlock(const Config &config, const std::shared_ptr pblock, bool fForceProcessing, bool *fNewBlock) { { CBlockIndex *pindex = nullptr; if (fNewBlock) { *fNewBlock = false; } const CChainParams &chainparams = config.GetChainParams(); CValidationState state; // Ensure that CheckBlock() passes before calling AcceptBlock, as // belt-and-suspenders. bool ret = CheckBlock(config, *pblock, state); LOCK(cs_main); if (ret) { // Store to disk ret = AcceptBlock(config, pblock, state, &pindex, fForceProcessing, nullptr, fNewBlock); } CheckBlockIndex(chainparams.GetConsensus()); if (!ret) { GetMainSignals().BlockChecked(*pblock, state); return error("%s: AcceptBlock FAILED", __func__); } } NotifyHeaderTip(); // Only used to report errors, not invalidity - ignore it CValidationState state; if (!ActivateBestChain(config, state, pblock)) { return error("%s: ActivateBestChain failed", __func__); } return true; } bool TestBlockValidity(const Config &config, CValidationState &state, const CBlock &block, CBlockIndex *pindexPrev, BlockValidationOptions validationOptions) { AssertLockHeld(cs_main); const CChainParams &chainparams = config.GetChainParams(); assert(pindexPrev && pindexPrev == chainActive.Tip()); if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, block.GetHash())) { return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str()); } CCoinsViewCache viewNew(pcoinsTip); CBlockIndex indexDummy(block); indexDummy.pprev = pindexPrev; indexDummy.nHeight = pindexPrev->nHeight + 1; // NOTE: CheckBlockHeader is called by CheckBlock if (!ContextualCheckBlockHeader(config, block, state, pindexPrev, GetAdjustedTime())) { return error("%s: Consensus::ContextualCheckBlockHeader: %s", __func__, FormatStateMessage(state)); } if (!CheckBlock(config, block, state, validationOptions)) { return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state)); } if (!ContextualCheckBlock(config, block, state, pindexPrev)) { return error("%s: Consensus::ContextualCheckBlock: %s", __func__, FormatStateMessage(state)); } if (!ConnectBlock(config, block, state, &indexDummy, viewNew, true)) { return false; } assert(state.IsValid()); return true; } /** * BLOCK PRUNING CODE */ /** * Calculate the amount of disk space the block & undo files currently use. */ static uint64_t CalculateCurrentUsage() { uint64_t retval = 0; for (const CBlockFileInfo &file : vinfoBlockFile) { retval += file.nSize + file.nUndoSize; } return retval; } /** * Prune a block file (modify associated database entries) */ void PruneOneBlockFile(const int fileNumber) { for (const std::pair &it : mapBlockIndex) { CBlockIndex *pindex = it.second; if (pindex->nFile == fileNumber) { pindex->nStatus = pindex->nStatus.withData(false).withUndo(false); pindex->nFile = 0; pindex->nDataPos = 0; pindex->nUndoPos = 0; setDirtyBlockIndex.insert(pindex); // Prune from mapBlocksUnlinked -- any block we prune would have // to be downloaded again in order to consider its chain, at which // point it would be considered as a candidate for // mapBlocksUnlinked or setBlockIndexCandidates. std::pair::iterator, std::multimap::iterator> range = mapBlocksUnlinked.equal_range(pindex->pprev); while (range.first != range.second) { std::multimap::iterator _it = range.first; range.first++; if (_it->second == pindex) { mapBlocksUnlinked.erase(_it); } } } } vinfoBlockFile[fileNumber].SetNull(); setDirtyFileInfo.insert(fileNumber); } void UnlinkPrunedFiles(const std::set &setFilesToPrune) { for (const int i : setFilesToPrune) { CDiskBlockPos pos(i, 0); fs::remove(GetBlockPosFilename(pos, "blk")); fs::remove(GetBlockPosFilename(pos, "rev")); LogPrintf("Prune: %s deleted blk/rev (%05u)\n", __func__, i); } } /** * Calculate the block/rev files to delete based on height specified by user * with RPC command pruneblockchain */ static void FindFilesToPruneManual(std::set &setFilesToPrune, int nManualPruneHeight) { assert(fPruneMode && nManualPruneHeight > 0); LOCK2(cs_main, cs_LastBlockFile); if (chainActive.Tip() == nullptr) { return; } // last block to prune is the lesser of (user-specified height, // MIN_BLOCKS_TO_KEEP from the tip) unsigned int nLastBlockWeCanPrune = std::min((unsigned)nManualPruneHeight, chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP); int count = 0; for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) { if (vinfoBlockFile[fileNumber].nSize == 0 || vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) { continue; } PruneOneBlockFile(fileNumber); setFilesToPrune.insert(fileNumber); count++; } LogPrintf("Prune (Manual): prune_height=%d removed %d blk/rev pairs\n", nLastBlockWeCanPrune, count); } /* This function is called from the RPC code for pruneblockchain */ void PruneBlockFilesManual(int nManualPruneHeight) { CValidationState state; const CChainParams &chainparams = Params(); FlushStateToDisk(chainparams, state, FLUSH_STATE_NONE, nManualPruneHeight); } /** * Prune block and undo files (blk???.dat and undo???.dat) so that the disk * space used is less than a user-defined target. The user sets the target (in * MB) on the command line or in config file. This will be run on startup and * whenever new space is allocated in a block or undo file, staying below the * target. Changing back to unpruned requires a reindex (which in this case * means the blockchain must be re-downloaded.) * * Pruning functions are called from FlushStateToDisk when the global * fCheckForPruning flag has been set. Block and undo files are deleted in * lock-step (when blk00003.dat is deleted, so is rev00003.dat.). Pruning cannot * take place until the longest chain is at least a certain length (100000 on * mainnet, 1000 on testnet, 1000 on regtest). Pruning will never delete a block * within a defined distance (currently 288) from the active chain's tip. The * block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks * that were stored in the deleted files. A db flag records the fact that at * least some block files have been pruned. * * @param[out] setFilesToPrune The set of file indices that can be unlinked * will be returned */ static void FindFilesToPrune(std::set &setFilesToPrune, uint64_t nPruneAfterHeight) { LOCK2(cs_main, cs_LastBlockFile); if (chainActive.Tip() == nullptr || nPruneTarget == 0) { return; } if (uint64_t(chainActive.Tip()->nHeight) <= nPruneAfterHeight) { return; } unsigned int nLastBlockWeCanPrune = chainActive.Tip()->nHeight - MIN_BLOCKS_TO_KEEP; uint64_t nCurrentUsage = CalculateCurrentUsage(); // We don't check to prune until after we've allocated new space for files, // so we should leave a buffer under our target to account for another // allocation before the next pruning. uint64_t nBuffer = BLOCKFILE_CHUNK_SIZE + UNDOFILE_CHUNK_SIZE; uint64_t nBytesToPrune; int count = 0; if (nCurrentUsage + nBuffer >= nPruneTarget) { for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) { nBytesToPrune = vinfoBlockFile[fileNumber].nSize + vinfoBlockFile[fileNumber].nUndoSize; if (vinfoBlockFile[fileNumber].nSize == 0) { continue; } // are we below our target? if (nCurrentUsage + nBuffer < nPruneTarget) { break; } // don't prune files that could have a block within // MIN_BLOCKS_TO_KEEP of the main chain's tip but keep scanning if (vinfoBlockFile[fileNumber].nHeightLast > nLastBlockWeCanPrune) { continue; } PruneOneBlockFile(fileNumber); // Queue up the files for removal setFilesToPrune.insert(fileNumber); nCurrentUsage -= nBytesToPrune; count++; } } LogPrint(BCLog::PRUNE, "Prune: target=%dMiB actual=%dMiB diff=%dMiB " "max_prune_height=%d removed %d blk/rev pairs\n", nPruneTarget / 1024 / 1024, nCurrentUsage / 1024 / 1024, ((int64_t)nPruneTarget - (int64_t)nCurrentUsage) / 1024 / 1024, nLastBlockWeCanPrune, count); } bool CheckDiskSpace(uint64_t nAdditionalBytes) { uint64_t nFreeBytesAvailable = fs::space(GetDataDir()).available; // Check for nMinDiskSpace bytes (currently 50MB) if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes) { return AbortNode("Disk space is low!", _("Error: Disk space is low!")); } return true; } static FILE *OpenDiskFile(const CDiskBlockPos &pos, const char *prefix, bool fReadOnly) { if (pos.IsNull()) { return nullptr; } fs::path path = GetBlockPosFilename(pos, prefix); fs::create_directories(path.parent_path()); FILE *file = fsbridge::fopen(path, "rb+"); if (!file && !fReadOnly) { file = fsbridge::fopen(path, "wb+"); } if (!file) { LogPrintf("Unable to open file %s\n", path.string()); return nullptr; } if (pos.nPos) { if (fseek(file, pos.nPos, SEEK_SET)) { LogPrintf("Unable to seek to position %u of %s\n", pos.nPos, path.string()); fclose(file); return nullptr; } } return file; } FILE *OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly) { return OpenDiskFile(pos, "blk", fReadOnly); } /** Open an undo file (rev?????.dat) */ static FILE *OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly) { return OpenDiskFile(pos, "rev", fReadOnly); } fs::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix) { return GetDataDir() / "blocks" / strprintf("%s%05u.dat", prefix, pos.nFile); } CBlockIndex *InsertBlockIndex(uint256 hash) { if (hash.IsNull()) { return nullptr; } // Return existing BlockMap::iterator mi = mapBlockIndex.find(hash); if (mi != mapBlockIndex.end()) { return (*mi).second; } // Create new CBlockIndex *pindexNew = new CBlockIndex(); if (!pindexNew) { throw std::runtime_error(std::string(__func__) + ": new CBlockIndex failed"); } mi = mapBlockIndex.insert(std::make_pair(hash, pindexNew)).first; pindexNew->phashBlock = &((*mi).first); return pindexNew; } static bool LoadBlockIndexDB(const Config &config) { if (!pblocktree->LoadBlockIndexGuts(config, InsertBlockIndex)) { return false; } boost::this_thread::interruption_point(); // Calculate nChainWork std::vector> vSortedByHeight; vSortedByHeight.reserve(mapBlockIndex.size()); for (const std::pair &item : mapBlockIndex) { CBlockIndex *pindex = item.second; vSortedByHeight.push_back(std::make_pair(pindex->nHeight, pindex)); } sort(vSortedByHeight.begin(), vSortedByHeight.end()); for (const std::pair &item : vSortedByHeight) { CBlockIndex *pindex = item.second; pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + GetBlockProof(*pindex); pindex->nTimeMax = (pindex->pprev ? std::max(pindex->pprev->nTimeMax, pindex->nTime) : pindex->nTime); // We can link the chain of blocks for which we've received transactions // at some point. Pruned nodes may have deleted the block. if (pindex->nTx > 0) { if (pindex->pprev) { if (pindex->pprev->nChainTx) { pindex->nChainTx = pindex->pprev->nChainTx + pindex->nTx; } else { pindex->nChainTx = 0; mapBlocksUnlinked.insert( std::make_pair(pindex->pprev, pindex)); } } else { pindex->nChainTx = pindex->nTx; } } if (pindex->IsValid(BlockValidity::TRANSACTIONS) && (pindex->nChainTx || pindex->pprev == nullptr)) { setBlockIndexCandidates.insert(pindex); } if (pindex->nStatus.isInvalid() && (!pindexBestInvalid || pindex->nChainWork > pindexBestInvalid->nChainWork)) { pindexBestInvalid = pindex; } if (pindex->pprev) { pindex->BuildSkip(); } if (pindex->IsValid(BlockValidity::TREE) && (pindexBestHeader == nullptr || CBlockIndexWorkComparator()(pindexBestHeader, pindex))) { pindexBestHeader = pindex; } } // Load block file info pblocktree->ReadLastBlockFile(nLastBlockFile); vinfoBlockFile.resize(nLastBlockFile + 1); LogPrintf("%s: last block file = %i\n", __func__, nLastBlockFile); for (int nFile = 0; nFile <= nLastBlockFile; nFile++) { pblocktree->ReadBlockFileInfo(nFile, vinfoBlockFile[nFile]); } LogPrintf("%s: last block file info: %s\n", __func__, vinfoBlockFile[nLastBlockFile].ToString()); for (int nFile = nLastBlockFile + 1; true; nFile++) { CBlockFileInfo info; if (pblocktree->ReadBlockFileInfo(nFile, info)) { vinfoBlockFile.push_back(info); } else { break; } } // Check presence of blk files LogPrintf("Checking all blk files are present...\n"); std::set setBlkDataFiles; for (const std::pair &item : mapBlockIndex) { CBlockIndex *pindex = item.second; if (pindex->nStatus.hasData()) { setBlkDataFiles.insert(pindex->nFile); } } for (const int i : setBlkDataFiles) { CDiskBlockPos pos(i, 0); if (CAutoFile(OpenBlockFile(pos, true), SER_DISK, CLIENT_VERSION) .IsNull()) { return false; } } // Check whether we have ever pruned block & undo files pblocktree->ReadFlag("prunedblockfiles", fHavePruned); if (fHavePruned) { LogPrintf( "LoadBlockIndexDB(): Block files have previously been pruned\n"); } // Check whether we need to continue reindexing bool fReindexing = false; pblocktree->ReadReindexing(fReindexing); fReindex |= fReindexing; // Check whether we have a transaction index pblocktree->ReadFlag("txindex", fTxIndex); LogPrintf("%s: transaction index %s\n", __func__, fTxIndex ? "enabled" : "disabled"); return true; } void LoadChainTip(const CChainParams &chainparams) { if (chainActive.Tip() && chainActive.Tip()->GetBlockHash() == pcoinsTip->GetBestBlock()) { return; } // Load pointer to end of best chain BlockMap::iterator it = mapBlockIndex.find(pcoinsTip->GetBestBlock()); if (it == mapBlockIndex.end()) { return; } chainActive.SetTip(it->second); PruneBlockIndexCandidates(); LogPrintf( "Loaded best chain: hashBestChain=%s height=%d date=%s progress=%f\n", chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(), DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()), GuessVerificationProgress(chainparams.TxData(), chainActive.Tip())); } CVerifyDB::CVerifyDB() { uiInterface.ShowProgress(_("Verifying blocks..."), 0); } CVerifyDB::~CVerifyDB() { uiInterface.ShowProgress("", 100); } bool CVerifyDB::VerifyDB(const Config &config, CCoinsView *coinsview, int nCheckLevel, int nCheckDepth) { LOCK(cs_main); if (chainActive.Tip() == nullptr || chainActive.Tip()->pprev == nullptr) { return true; } // Verify blocks in the best chain if (nCheckDepth <= 0) { // suffices until the year 19000 nCheckDepth = 1000000000; } if (nCheckDepth > chainActive.Height()) { nCheckDepth = chainActive.Height(); } nCheckLevel = std::max(0, std::min(4, nCheckLevel)); LogPrintf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel); CCoinsViewCache coins(coinsview); CBlockIndex *pindexState = chainActive.Tip(); CBlockIndex *pindexFailure = nullptr; int nGoodTransactions = 0; CValidationState state; int reportDone = 0; LogPrintf("[0%%]..."); for (CBlockIndex *pindex = chainActive.Tip(); pindex && pindex->pprev; pindex = pindex->pprev) { boost::this_thread::interruption_point(); int percentageDone = std::max( 1, std::min( 99, (int)(((double)(chainActive.Height() - pindex->nHeight)) / (double)nCheckDepth * (nCheckLevel >= 4 ? 50 : 100)))); if (reportDone < percentageDone / 10) { // report every 10% step LogPrintf("[%d%%]...", percentageDone); reportDone = percentageDone / 10; } uiInterface.ShowProgress(_("Verifying blocks..."), percentageDone); if (pindex->nHeight < chainActive.Height() - nCheckDepth) { break; } if (fPruneMode && !pindex->nStatus.hasData()) { // If pruning, only go back as far as we have data. LogPrintf("VerifyDB(): block verification stopping at height %d " "(pruning, no data)\n", pindex->nHeight); break; } CBlock block; // check level 0: read from disk if (!ReadBlockFromDisk(block, pindex, config)) { return error( "VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString()); } // check level 1: verify block validity if (nCheckLevel >= 1 && !CheckBlock(config, block, state)) { return error("%s: *** found bad block at %d, hash=%s (%s)\n", __func__, pindex->nHeight, pindex->GetBlockHash().ToString(), FormatStateMessage(state)); } // check level 2: verify undo validity if (nCheckLevel >= 2 && pindex) { CBlockUndo undo; CDiskBlockPos pos = pindex->GetUndoPos(); if (!pos.IsNull()) { if (!UndoReadFromDisk(undo, pos, pindex->pprev->GetBlockHash())) { return error( "VerifyDB(): *** found bad undo data at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); } } } // check level 3: check for inconsistencies during memory-only // disconnect of tip blocks if (nCheckLevel >= 3 && pindex == pindexState && (coins.DynamicMemoryUsage() + pcoinsTip->DynamicMemoryUsage()) <= nCoinCacheUsage) { assert(coins.GetBestBlock() == pindex->GetBlockHash()); DisconnectResult res = DisconnectBlock(block, pindex, coins); if (res == DISCONNECT_FAILED) { return error("VerifyDB(): *** irrecoverable inconsistency in " "block data at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString()); } pindexState = pindex->pprev; if (res == DISCONNECT_UNCLEAN) { nGoodTransactions = 0; pindexFailure = pindex; } else { nGoodTransactions += block.vtx.size(); } } if (ShutdownRequested()) { return true; } } if (pindexFailure) { return error("VerifyDB(): *** coin database inconsistencies found " "(last %i blocks, %i good transactions before that)\n", chainActive.Height() - pindexFailure->nHeight + 1, nGoodTransactions); } // check level 4: try reconnecting blocks if (nCheckLevel >= 4) { CBlockIndex *pindex = pindexState; while (pindex != chainActive.Tip()) { boost::this_thread::interruption_point(); uiInterface.ShowProgress( _("Verifying blocks..."), std::max(1, std::min(99, 100 - (int)(((double)(chainActive.Height() - pindex->nHeight)) / (double)nCheckDepth * 50)))); pindex = chainActive.Next(pindex); CBlock block; if (!ReadBlockFromDisk(block, pindex, config)) { return error( "VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString()); } if (!ConnectBlock(config, block, state, pindex, coins)) { return error( "VerifyDB(): *** found unconnectable block at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString()); } } } LogPrintf("[DONE].\n"); LogPrintf("No coin database inconsistencies in last %i blocks (%i " "transactions)\n", chainActive.Height() - pindexState->nHeight, nGoodTransactions); return true; } /** * Apply the effects of a block on the utxo cache, ignoring that it may already * have been applied. */ static bool RollforwardBlock(const CBlockIndex *pindex, CCoinsViewCache &view, const Config &config) { // TODO: merge with ConnectBlock CBlock block; if (!ReadBlockFromDisk(block, pindex, config)) { return error("ReplayBlock(): ReadBlockFromDisk failed at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString()); } for (const CTransactionRef &tx : block.vtx) { // Pass check = true as every addition may be an overwrite. AddCoins(view, *tx, pindex->nHeight, true); } for (const CTransactionRef &tx : block.vtx) { if (tx->IsCoinBase()) { continue; } for (const CTxIn &txin : tx->vin) { view.SpendCoin(txin.prevout); } } return true; } bool ReplayBlocks(const Config &config, CCoinsView *view) { LOCK(cs_main); CCoinsViewCache cache(view); std::vector hashHeads = view->GetHeadBlocks(); if (hashHeads.empty()) { // We're already in a consistent state. return true; } if (hashHeads.size() != 2) { return error("ReplayBlocks(): unknown inconsistent state"); } uiInterface.ShowProgress(_("Replaying blocks..."), 0); LogPrintf("Replaying blocks\n"); // Old tip during the interrupted flush. const CBlockIndex *pindexOld = nullptr; // New tip during the interrupted flush. const CBlockIndex *pindexNew; // Latest block common to both the old and the new tip. const CBlockIndex *pindexFork = nullptr; if (mapBlockIndex.count(hashHeads[0]) == 0) { return error( "ReplayBlocks(): reorganization to unknown block requested"); } pindexNew = mapBlockIndex[hashHeads[0]]; if (!hashHeads[1].IsNull()) { // The old tip is allowed to be 0, indicating it's the first flush. if (mapBlockIndex.count(hashHeads[1]) == 0) { return error( "ReplayBlocks(): reorganization from unknown block requested"); } pindexOld = mapBlockIndex[hashHeads[1]]; pindexFork = LastCommonAncestor(pindexOld, pindexNew); assert(pindexFork != nullptr); } // Rollback along the old branch. while (pindexOld != pindexFork) { if (pindexOld->nHeight > 0) { // Never disconnect the genesis block. CBlock block; if (!ReadBlockFromDisk(block, pindexOld, config)) { return error("RollbackBlock(): ReadBlockFromDisk() failed at " "%d, hash=%s", pindexOld->nHeight, pindexOld->GetBlockHash().ToString()); } LogPrintf("Rolling back %s (%i)\n", pindexOld->GetBlockHash().ToString(), pindexOld->nHeight); DisconnectResult res = DisconnectBlock(block, pindexOld, cache); if (res == DISCONNECT_FAILED) { return error( "RollbackBlock(): DisconnectBlock failed at %d, hash=%s", pindexOld->nHeight, pindexOld->GetBlockHash().ToString()); } // If DISCONNECT_UNCLEAN is returned, it means a non-existing UTXO // was deleted, or an existing UTXO was overwritten. It corresponds // to cases where the block-to-be-disconnect never had all its // operations applied to the UTXO set. However, as both writing a // UTXO and deleting a UTXO are idempotent operations, the result is // still a version of the UTXO set with the effects of that block // undone. } pindexOld = pindexOld->pprev; } // Roll forward from the forking point to the new tip. int nForkHeight = pindexFork ? pindexFork->nHeight : 0; for (int nHeight = nForkHeight + 1; nHeight <= pindexNew->nHeight; ++nHeight) { const CBlockIndex *pindex = pindexNew->GetAncestor(nHeight); LogPrintf("Rolling forward %s (%i)\n", pindex->GetBlockHash().ToString(), nHeight); if (!RollforwardBlock(pindex, cache, config)) { return false; } } cache.SetBestBlock(pindexNew->GetBlockHash()); cache.Flush(); uiInterface.ShowProgress("", 100); return true; } bool RewindBlockIndex(const Config &config) { LOCK(cs_main); const CChainParams ¶ms = config.GetChainParams(); int nHeight = chainActive.Height() + 1; // nHeight is now the height of the first insufficiently-validated block, or // tipheight + 1 CValidationState state; CBlockIndex *pindex = chainActive.Tip(); while (chainActive.Height() >= nHeight) { if (fPruneMode && !chainActive.Tip()->nStatus.hasData()) { // If pruning, don't try rewinding past the HAVE_DATA point; since // older blocks can't be served anyway, there's no need to walk // further, and trying to DisconnectTip() will fail (and require a // needless reindex/redownload of the blockchain). break; } if (!DisconnectTip(config, state, nullptr)) { return error( "RewindBlockIndex: unable to disconnect block at height %i", pindex->nHeight); } // Occasionally flush state to disk. if (!FlushStateToDisk(params, state, FLUSH_STATE_PERIODIC)) { return false; } } // Reduce validity flag and have-data flags. // We do this after actual disconnecting, otherwise we'll end up writing the // lack of data to disk before writing the chainstate, resulting in a // failure to continue if interrupted. for (const std::pair &p : mapBlockIndex) { CBlockIndex *pindexIter = p.second; if (pindexIter->IsValid(BlockValidity::TRANSACTIONS) && pindexIter->nChainTx) { setBlockIndexCandidates.insert(pindexIter); } } PruneBlockIndexCandidates(); CheckBlockIndex(params.GetConsensus()); if (!FlushStateToDisk(params, state, FLUSH_STATE_ALWAYS)) { return false; } return true; } // May NOT be used after any connections are up as much of the peer-processing // logic assumes a consistent block index state void UnloadBlockIndex() { LOCK(cs_main); setBlockIndexCandidates.clear(); chainActive.SetTip(nullptr); pindexBestInvalid = nullptr; pindexBestHeader = nullptr; mempool.clear(); mapBlocksUnlinked.clear(); vinfoBlockFile.clear(); nLastBlockFile = 0; nBlockSequenceId = 1; setDirtyBlockIndex.clear(); setDirtyFileInfo.clear(); versionbitscache.Clear(); for (BlockMap::value_type &entry : mapBlockIndex) { delete entry.second; } mapBlockIndex.clear(); fHavePruned = false; } bool LoadBlockIndex(const Config &config) { // Load block index from databases if (!fReindex && !LoadBlockIndexDB(config)) { return false; } return true; } bool InitBlockIndex(const Config &config) { LOCK(cs_main); // Check whether we're already initialized if (chainActive.Genesis() != nullptr) { return true; } // Use the provided setting for -txindex in the new database fTxIndex = gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX); pblocktree->WriteFlag("txindex", fTxIndex); LogPrintf("Initializing databases...\n"); // Only add the genesis block if not reindexing (in which case we reuse the // one already on disk) if (!fReindex) { try { const CChainParams &chainparams = config.GetChainParams(); CBlock &block = const_cast(chainparams.GenesisBlock()); // Start new block file unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION); CDiskBlockPos blockPos; CValidationState state; if (!FindBlockPos(state, blockPos, nBlockSize + 8, 0, block.GetBlockTime())) { return error("LoadBlockIndex(): FindBlockPos failed"); } if (!WriteBlockToDisk(block, blockPos, chainparams.DiskMagic())) { return error( "LoadBlockIndex(): writing genesis block to disk failed"); } CBlockIndex *pindex = AddToBlockIndex(block); if (!ReceivedBlockTransactions(block, state, pindex, blockPos)) { return error("LoadBlockIndex(): genesis block not accepted"); } } catch (const std::runtime_error &e) { return error( "LoadBlockIndex(): failed to initialize block database: %s", e.what()); } } return true; } bool LoadExternalBlockFile(const Config &config, FILE *fileIn, CDiskBlockPos *dbp) { // Map of disk positions for blocks with unknown parent (only used for // reindex) static std::multimap mapBlocksUnknownParent; int64_t nStart = GetTimeMillis(); const CChainParams &chainparams = config.GetChainParams(); int nLoaded = 0; try { // This takes over fileIn and calls fclose() on it in the CBufferedFile // destructor. Make sure we have at least 2*MAX_TX_SIZE space in there // so any transaction can fit in the buffer. CBufferedFile blkdat(fileIn, 2 * MAX_TX_SIZE, MAX_TX_SIZE + 8, SER_DISK, CLIENT_VERSION); uint64_t nRewind = blkdat.GetPos(); while (!blkdat.eof()) { boost::this_thread::interruption_point(); blkdat.SetPos(nRewind); // Start one byte further next time, in case of failure. nRewind++; // Remove former limit. blkdat.SetLimit(); unsigned int nSize = 0; try { // Locate a header. uint8_t buf[CMessageHeader::MESSAGE_START_SIZE]; blkdat.FindByte(chainparams.DiskMagic()[0]); nRewind = blkdat.GetPos() + 1; blkdat >> FLATDATA(buf); if (memcmp(buf, std::begin(chainparams.DiskMagic()), CMessageHeader::MESSAGE_START_SIZE)) { continue; } // Read size. blkdat >> nSize; if (nSize < 80) { continue; } } catch (const std::exception &) { // No valid block header found; don't complain. break; } try { // read block uint64_t nBlockPos = blkdat.GetPos(); if (dbp) { dbp->nPos = nBlockPos; } blkdat.SetLimit(nBlockPos + nSize); blkdat.SetPos(nBlockPos); std::shared_ptr pblock = std::make_shared(); CBlock &block = *pblock; blkdat >> block; nRewind = blkdat.GetPos(); // detect out of order blocks, and store them for later uint256 hash = block.GetHash(); if (hash != chainparams.GetConsensus().hashGenesisBlock && mapBlockIndex.find(block.hashPrevBlock) == mapBlockIndex.end()) { LogPrint(BCLog::REINDEX, "%s: Out of order block %s, parent %s not known\n", __func__, hash.ToString(), block.hashPrevBlock.ToString()); if (dbp) { mapBlocksUnknownParent.insert( std::make_pair(block.hashPrevBlock, *dbp)); } continue; } // process in case the block isn't known yet if (mapBlockIndex.count(hash) == 0 || !mapBlockIndex[hash]->nStatus.hasData()) { LOCK(cs_main); CValidationState state; if (AcceptBlock(config, pblock, state, nullptr, true, dbp, nullptr)) { nLoaded++; } if (state.IsError()) { break; } } else if (hash != chainparams.GetConsensus().hashGenesisBlock && mapBlockIndex[hash]->nHeight % 1000 == 0) { LogPrint( BCLog::REINDEX, "Block Import: already had block %s at height %d\n", hash.ToString(), mapBlockIndex[hash]->nHeight); } // Activate the genesis block so normal node progress can // continue if (hash == chainparams.GetConsensus().hashGenesisBlock) { CValidationState state; if (!ActivateBestChain(config, state)) { break; } } NotifyHeaderTip(); // Recursively process earlier encountered successors of this // block std::deque queue; queue.push_back(hash); while (!queue.empty()) { uint256 head = queue.front(); queue.pop_front(); std::pair::iterator, std::multimap::iterator> range = mapBlocksUnknownParent.equal_range(head); while (range.first != range.second) { std::multimap::iterator it = range.first; std::shared_ptr pblockrecursive = std::make_shared(); if (ReadBlockFromDisk(*pblockrecursive, it->second, config)) { LogPrint( BCLog::REINDEX, "%s: Processing out of order child %s of %s\n", __func__, pblockrecursive->GetHash().ToString(), head.ToString()); LOCK(cs_main); CValidationState dummy; if (AcceptBlock(config, pblockrecursive, dummy, nullptr, true, &it->second, nullptr)) { nLoaded++; queue.push_back(pblockrecursive->GetHash()); } } range.first++; mapBlocksUnknownParent.erase(it); NotifyHeaderTip(); } } } catch (const std::exception &e) { LogPrintf("%s: Deserialize or I/O error - %s\n", __func__, e.what()); } } } catch (const std::runtime_error &e) { AbortNode(std::string("System error: ") + e.what()); } if (nLoaded > 0) { LogPrintf("Loaded %i blocks from external file in %dms\n", nLoaded, GetTimeMillis() - nStart); } return nLoaded > 0; } static void CheckBlockIndex(const Consensus::Params &consensusParams) { if (!fCheckBlockIndex) { return; } LOCK(cs_main); // During a reindex, we read the genesis block and call CheckBlockIndex // before ActivateBestChain, so we have the genesis block in mapBlockIndex // but no active chain. (A few of the tests when iterating the block tree // require that chainActive has been initialized.) if (chainActive.Height() < 0) { assert(mapBlockIndex.size() <= 1); return; } // Build forward-pointing map of the entire block tree. std::multimap forward; for (const std::pair &it : mapBlockIndex) { forward.emplace(it.second->pprev, it.second); } assert(forward.size() == mapBlockIndex.size()); std::pair::iterator, std::multimap::iterator> rangeGenesis = forward.equal_range(nullptr); CBlockIndex *pindex = rangeGenesis.first->second; rangeGenesis.first++; // There is only one index entry with parent nullptr. assert(rangeGenesis.first == rangeGenesis.second); // Iterate over the entire block tree, using depth-first search. // Along the way, remember whether there are blocks on the path from genesis // block being explored which are the first to have certain properties. size_t nNodes = 0; int nHeight = 0; // Oldest ancestor of pindex which is invalid. CBlockIndex *pindexFirstInvalid = nullptr; // Oldest ancestor of pindex which is parked. CBlockIndex *pindexFirstParked = nullptr; // Oldest ancestor of pindex which does not have data available. CBlockIndex *pindexFirstMissing = nullptr; // Oldest ancestor of pindex for which nTx == 0. CBlockIndex *pindexFirstNeverProcessed = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_TREE // (regardless of being valid or not). CBlockIndex *pindexFirstNotTreeValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_TRANSACTIONS // (regardless of being valid or not). CBlockIndex *pindexFirstNotTransactionsValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_CHAIN // (regardless of being valid or not). CBlockIndex *pindexFirstNotChainValid = nullptr; // Oldest ancestor of pindex which does not have BLOCK_VALID_SCRIPTS // (regardless of being valid or not). CBlockIndex *pindexFirstNotScriptsValid = nullptr; while (pindex != nullptr) { nNodes++; if (pindexFirstInvalid == nullptr && pindex->nStatus.hasFailed()) { pindexFirstInvalid = pindex; } if (pindexFirstParked == nullptr && pindex->nStatus.isParked()) { pindexFirstParked = pindex; } if (pindexFirstMissing == nullptr && !pindex->nStatus.hasData()) { pindexFirstMissing = pindex; } if (pindexFirstNeverProcessed == nullptr && pindex->nTx == 0) { pindexFirstNeverProcessed = pindex; } if (pindex->pprev != nullptr && pindexFirstNotTreeValid == nullptr && pindex->nStatus.getValidity() < BlockValidity::TREE) { pindexFirstNotTreeValid = pindex; } if (pindex->pprev != nullptr && pindexFirstNotTransactionsValid == nullptr && pindex->nStatus.getValidity() < BlockValidity::TRANSACTIONS) { pindexFirstNotTransactionsValid = pindex; } if (pindex->pprev != nullptr && pindexFirstNotChainValid == nullptr && pindex->nStatus.getValidity() < BlockValidity::CHAIN) { pindexFirstNotChainValid = pindex; } if (pindex->pprev != nullptr && pindexFirstNotScriptsValid == nullptr && pindex->nStatus.getValidity() < BlockValidity::SCRIPTS) { pindexFirstNotScriptsValid = pindex; } // Begin: actual consistency checks. if (pindex->pprev == nullptr) { // Genesis block checks. // Genesis block's hash must match. assert(pindex->GetBlockHash() == consensusParams.hashGenesisBlock); // The current active chain's genesis block must be this block. assert(pindex == chainActive.Genesis()); } if (pindex->nChainTx == 0) { // nSequenceId can't be set positive for blocks that aren't linked // (negative is used for preciousblock) assert(pindex->nSequenceId <= 0); } // VALID_TRANSACTIONS is equivalent to nTx > 0 for all nodes (whether or // not pruning has occurred). HAVE_DATA is only equivalent to nTx > 0 // (or VALID_TRANSACTIONS) if no pruning has occurred. if (!fHavePruned) { // If we've never pruned, then HAVE_DATA should be equivalent to nTx // > 0 assert(!pindex->nStatus.hasData() == (pindex->nTx == 0)); assert(pindexFirstMissing == pindexFirstNeverProcessed); } else if (pindex->nStatus.hasData()) { // If we have pruned, then we can only say that HAVE_DATA implies // nTx > 0 assert(pindex->nTx > 0); } if (pindex->nStatus.hasUndo()) { assert(pindex->nStatus.hasData()); } // This is pruning-independent. assert((pindex->nStatus.getValidity() >= BlockValidity::TRANSACTIONS) == (pindex->nTx > 0)); // All parents having had data (at some point) is equivalent to all // parents being VALID_TRANSACTIONS, which is equivalent to nChainTx // being set. // nChainTx != 0 is used to signal that all parent blocks have been // processed (but may have been pruned). assert((pindexFirstNeverProcessed != nullptr) == (pindex->nChainTx == 0)); assert((pindexFirstNotTransactionsValid != nullptr) == (pindex->nChainTx == 0)); // nHeight must be consistent. assert(pindex->nHeight == nHeight); // For every block except the genesis block, the chainwork must be // larger than the parent's. assert(pindex->pprev == nullptr || pindex->nChainWork >= pindex->pprev->nChainWork); // The pskip pointer must point back for all but the first 2 blocks. assert(nHeight < 2 || (pindex->pskip && (pindex->pskip->nHeight < nHeight))); // All mapBlockIndex entries must at least be TREE valid assert(pindexFirstNotTreeValid == nullptr); if (pindex->nStatus.getValidity() >= BlockValidity::TREE) { // TREE valid implies all parents are TREE valid assert(pindexFirstNotTreeValid == nullptr); } if (pindex->nStatus.getValidity() >= BlockValidity::CHAIN) { // CHAIN valid implies all parents are CHAIN valid assert(pindexFirstNotChainValid == nullptr); } if (pindex->nStatus.getValidity() >= BlockValidity::SCRIPTS) { // SCRIPTS valid implies all parents are SCRIPTS valid assert(pindexFirstNotScriptsValid == nullptr); } if (pindexFirstInvalid == nullptr) { // Checks for not-invalid blocks. // The failed mask cannot be set for blocks without invalid parents. assert(!pindex->nStatus.isInvalid()); } if (pindexFirstParked == nullptr) { // Checks for not-invalid blocks. // The failed mask cannot be set for blocks without invalid parents. assert(!pindex->nStatus.isOnParkedChain()); } if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) && pindexFirstNeverProcessed == nullptr) { if (pindexFirstInvalid == nullptr) { // If this block sorts at least as good as the current tip and // is valid and we have all data for its parents, it must be in // setBlockIndexCandidates. chainActive.Tip() must also be there // even if some data has been pruned. if (pindexFirstMissing == nullptr || pindex == chainActive.Tip()) { assert(setBlockIndexCandidates.count(pindex)); } // If some parent is missing, then it could be that this block // was in setBlockIndexCandidates but had to be removed because // of the missing data. In this case it must be in // mapBlocksUnlinked -- see test below. } } else { // If this block sorts worse than the current tip or some ancestor's // block has never been seen, it cannot be in // setBlockIndexCandidates. assert(setBlockIndexCandidates.count(pindex) == 0); } // Check whether this block is in mapBlocksUnlinked. std::pair::iterator, std::multimap::iterator> rangeUnlinked = mapBlocksUnlinked.equal_range(pindex->pprev); bool foundInUnlinked = false; while (rangeUnlinked.first != rangeUnlinked.second) { assert(rangeUnlinked.first->first == pindex->pprev); if (rangeUnlinked.first->second == pindex) { foundInUnlinked = true; break; } rangeUnlinked.first++; } if (pindex->pprev && pindex->nStatus.hasData() && pindexFirstNeverProcessed != nullptr && pindexFirstInvalid == nullptr) { // If this block has block data available, some parent was never // received, and has no invalid parents, it must be in // mapBlocksUnlinked. assert(foundInUnlinked); } if (!pindex->nStatus.hasData()) { // Can't be in mapBlocksUnlinked if we don't HAVE_DATA assert(!foundInUnlinked); } if (pindexFirstMissing == nullptr) { // We aren't missing data for any parent -- cannot be in // mapBlocksUnlinked. assert(!foundInUnlinked); } if (pindex->pprev && pindex->nStatus.hasData() && pindexFirstNeverProcessed == nullptr && pindexFirstMissing != nullptr) { // We HAVE_DATA for this block, have received data for all parents // at some point, but we're currently missing data for some parent. // We must have pruned. assert(fHavePruned); // This block may have entered mapBlocksUnlinked if: // - it has a descendant that at some point had more work than the // tip, and // - we tried switching to that descendant but were missing // data for some intermediate block between chainActive and the // tip. // So if this block is itself better than chainActive.Tip() and it // wasn't in // setBlockIndexCandidates, then it must be in mapBlocksUnlinked. if (!CBlockIndexWorkComparator()(pindex, chainActive.Tip()) && setBlockIndexCandidates.count(pindex) == 0) { if (pindexFirstInvalid == nullptr) { assert(foundInUnlinked); } } } // Perhaps too slow // assert(pindex->GetBlockHash() == pindex->GetBlockHeader().GetHash()); // End: actual consistency checks. // Try descending into the first subnode. std::pair::iterator, std::multimap::iterator> range = forward.equal_range(pindex); if (range.first != range.second) { // A subnode was found. pindex = range.first->second; nHeight++; continue; } // This is a leaf node. Move upwards until we reach a node of which we // have not yet visited the last child. while (pindex) { // We are going to either move to a parent or a sibling of pindex. // If pindex was the first with a certain property, unset the // corresponding variable. if (pindex == pindexFirstInvalid) { pindexFirstInvalid = nullptr; } if (pindex == pindexFirstParked) { pindexFirstParked = nullptr; } if (pindex == pindexFirstMissing) { pindexFirstMissing = nullptr; } if (pindex == pindexFirstNeverProcessed) { pindexFirstNeverProcessed = nullptr; } if (pindex == pindexFirstNotTreeValid) { pindexFirstNotTreeValid = nullptr; } if (pindex == pindexFirstNotTransactionsValid) { pindexFirstNotTransactionsValid = nullptr; } if (pindex == pindexFirstNotChainValid) { pindexFirstNotChainValid = nullptr; } if (pindex == pindexFirstNotScriptsValid) { pindexFirstNotScriptsValid = nullptr; } // Find our parent. CBlockIndex *pindexPar = pindex->pprev; // Find which child we just visited. std::pair::iterator, std::multimap::iterator> rangePar = forward.equal_range(pindexPar); while (rangePar.first->second != pindex) { // Our parent must have at least the node we're coming from as // child. assert(rangePar.first != rangePar.second); rangePar.first++; } // Proceed to the next one. rangePar.first++; if (rangePar.first != rangePar.second) { // Move to the sibling. pindex = rangePar.first->second; break; } else { // Move up further. pindex = pindexPar; nHeight--; continue; } } } // Check that we actually traversed the entire map. assert(nNodes == forward.size()); } std::string CBlockFileInfo::ToString() const { return strprintf( "CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)", nBlocks, nSize, nHeightFirst, nHeightLast, DateTimeStrFormat("%Y-%m-%d", nTimeFirst), DateTimeStrFormat("%Y-%m-%d", nTimeLast)); } CBlockFileInfo *GetBlockFileInfo(size_t n) { return &vinfoBlockFile.at(n); } static const uint64_t MEMPOOL_DUMP_VERSION = 1; bool LoadMempool(const Config &config) { int64_t nExpiryTimeout = gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60; FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat", "rb"); CAutoFile file(filestr, SER_DISK, CLIENT_VERSION); if (file.IsNull()) { LogPrintf( "Failed to open mempool file from disk. Continuing anyway.\n"); return false; } int64_t count = 0; int64_t skipped = 0; int64_t failed = 0; int64_t nNow = GetTime(); try { uint64_t version; file >> version; if (version != MEMPOOL_DUMP_VERSION) { return false; } uint64_t num; file >> num; double prioritydummy = 0; while (num--) { CTransactionRef tx; int64_t nTime; int64_t nFeeDelta; file >> tx; file >> nTime; file >> nFeeDelta; Amount amountdelta(nFeeDelta); if (amountdelta != Amount(0)) { mempool.PrioritiseTransaction(tx->GetId(), tx->GetId().ToString(), prioritydummy, amountdelta); } CValidationState state; if (nTime + nExpiryTimeout > nNow) { LOCK(cs_main); AcceptToMemoryPoolWithTime(config, mempool, state, tx, true, nullptr, nTime); if (state.IsValid()) { ++count; } else { ++failed; } } else { ++skipped; } if (ShutdownRequested()) { return false; } } std::map mapDeltas; file >> mapDeltas; for (const auto &i : mapDeltas) { mempool.PrioritiseTransaction(i.first, i.first.ToString(), prioritydummy, i.second); } } catch (const std::exception &e) { LogPrintf("Failed to deserialize mempool data on disk: %s. Continuing " "anyway.\n", e.what()); return false; } LogPrintf("Imported mempool transactions from disk: %i successes, %i " "failed, %i expired\n", count, failed, skipped); return true; } void DumpMempool(void) { int64_t start = GetTimeMicros(); std::map mapDeltas; std::vector vinfo; { LOCK(mempool.cs); for (const auto &i : mempool.mapDeltas) { mapDeltas[i.first] = i.second.second; } vinfo = mempool.infoAll(); } int64_t mid = GetTimeMicros(); try { FILE *filestr = fsbridge::fopen(GetDataDir() / "mempool.dat.new", "wb"); if (!filestr) { return; } CAutoFile file(filestr, SER_DISK, CLIENT_VERSION); uint64_t version = MEMPOOL_DUMP_VERSION; file << version; file << uint64_t(vinfo.size()); for (const auto &i : vinfo) { file << *(i.tx); file << int64_t(i.nTime); file << i.nFeeDelta; mapDeltas.erase(i.tx->GetId()); } file << mapDeltas; FileCommit(file.Get()); file.fclose(); RenameOver(GetDataDir() / "mempool.dat.new", GetDataDir() / "mempool.dat"); int64_t last = GetTimeMicros(); LogPrintf("Dumped mempool: %gs to copy, %gs to dump\n", (mid - start) * 0.000001, (last - mid) * 0.000001); } catch (const std::exception &e) { LogPrintf("Failed to dump mempool: %s. Continuing anyway.\n", e.what()); } } //! Guess how far we are in the verification process at the given block index double GuessVerificationProgress(const ChainTxData &data, CBlockIndex *pindex) { if (pindex == nullptr) { return 0.0; } int64_t nNow = time(nullptr); double fTxTotal; if (pindex->nChainTx <= data.nTxCount) { fTxTotal = data.nTxCount + (nNow - data.nTime) * data.dTxRate; } else { fTxTotal = pindex->nChainTx + (nNow - pindex->GetBlockTime()) * data.dTxRate; } return pindex->nChainTx / fTxTotal; } class CMainCleanup { public: CMainCleanup() {} ~CMainCleanup() { // block headers for (const std::pair &it : mapBlockIndex) { delete it.second; } mapBlockIndex.clear(); } } instance_of_cmaincleanup; diff --git a/src/validation.h b/src/validation.h index 5f5ff82d8..651200bc8 100644 --- a/src/validation.h +++ b/src/validation.h @@ -1,761 +1,762 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto // Copyright (c) 2009-2016 The Bitcoin Core developers // Copyright (c) 2017 The Bitcoin developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #ifndef BITCOIN_VALIDATION_H #define BITCOIN_VALIDATION_H #if defined(HAVE_CONFIG_H) #include "config/bitcoin-config.h" #endif #include "amount.h" #include "blockfileinfo.h" #include "chain.h" #include "coins.h" #include "consensus/consensus.h" +#include "diskblockpos.h" #include "fs.h" #include "protocol.h" // For CMessageHeader::MessageMagic #include "script/script_error.h" #include "sync.h" #include "versionbits.h" #include #include #include #include #include #include #include #include #include class CBlockIndex; class CBlockTreeDB; class CBloomFilter; class CChainParams; class CConnman; class CDiskBlockPos; class CInv; class Config; class CScriptCheck; class CTxMemPool; class CTxUndo; class CValidationInterface; class CValidationState; struct ChainTxData; struct PrecomputedTransactionData; struct LockPoints; #define MIN_TRANSACTION_SIZE \ (::GetSerializeSize(CTransaction(), SER_NETWORK, PROTOCOL_VERSION)) /** Default for DEFAULT_WHITELISTRELAY. */ static const bool DEFAULT_WHITELISTRELAY = true; /** Default for DEFAULT_WHITELISTFORCERELAY. */ static const bool DEFAULT_WHITELISTFORCERELAY = true; /** Default for -minrelaytxfee, minimum relay fee for transactions */ static const Amount DEFAULT_MIN_RELAY_TX_FEE(1000); /** Default for -excessutxocharge for transactions transactions */ static const Amount DEFAULT_UTXO_FEE(0); //! -maxtxfee default static const Amount DEFAULT_TRANSACTION_MAXFEE(COIN / 10); //! Discourage users to set fees higher than this amount (in satoshis) per kB static const Amount HIGH_TX_FEE_PER_KB(COIN / 100); /** -maxtxfee will warn if called with a higher fee than this amount (in * satoshis */ static const Amount HIGH_MAX_TX_FEE(100 * HIGH_TX_FEE_PER_KB); /** Default for -limitancestorcount, max number of in-mempool ancestors */ static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25; /** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool * ancestors */ static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101; /** Default for -limitdescendantcount, max number of in-mempool descendants */ static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25; /** Default for -limitdescendantsize, maximum kilobytes of in-mempool * descendants */ static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101; /** Default for -mempoolexpiry, expiration time for mempool transactions in * hours */ static const unsigned int DEFAULT_MEMPOOL_EXPIRY = 336; /** The maximum size of a blk?????.dat file (since 0.8) */ static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB /** The pre-allocation chunk size for blk?????.dat files (since 0.8) */ static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB /** The pre-allocation chunk size for rev?????.dat files (since 0.8) */ static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB /** Maximum number of script-checking threads allowed */ static const int MAX_SCRIPTCHECK_THREADS = 16; /** -par default (number of script-checking threads, 0 = auto) */ static const int DEFAULT_SCRIPTCHECK_THREADS = 0; /** Number of blocks that can be requested at any given time from a single peer. */ static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16; /** * Timeout in seconds during which a peer must stall block download progress * before being disconnected. */ static const unsigned int BLOCK_STALLING_TIMEOUT = 2; /** * Number of headers sent in one getheaders result. We rely on the assumption * that if a peer sends less than this number, we reached its tip. Changing this * value is a protocol upgrade. */ static const unsigned int MAX_HEADERS_RESULTS = 2000; /** * Maximum depth of blocks we're willing to serve as compact blocks to peers * when requested. For older blocks, a regular BLOCK response will be sent. */ static const int MAX_CMPCTBLOCK_DEPTH = 5; /** * Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for. */ static const int MAX_BLOCKTXN_DEPTH = 10; /** * Size of the "block download window": how far ahead of our current height do * we fetch ? Larger windows tolerate larger download speed differences between * peer, but increase the potential degree of disordering of blocks on disk * (which make reindexing and in the future perhaps pruning harder). We'll * probably want to make this a per-peer adaptive value at some point. */ static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024; /** Time to wait (in seconds) between writing blocks/block index to disk. */ static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60; /** Time to wait (in seconds) between flushing chainstate to disk. */ static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60; /** Maximum length of reject messages. */ static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111; /** Average delay between local address broadcasts in seconds. */ static const unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 24 * 60; /** Average delay between peer address broadcasts in seconds. */ static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30; /** * Average delay between trickled inventory transmissions in seconds. * Blocks and whitelisted receivers bypass this, outbound peers get half this * delay. */ static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5; /** * Maximum number of inventory items to send per transmission. * Limits the impact of low-fee transaction floods. */ static const unsigned int INVENTORY_BROADCAST_MAX = 7 * INVENTORY_BROADCAST_INTERVAL; /** Average delay between feefilter broadcasts in seconds. */ static const unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60; /** Maximum feefilter broadcast delay after significant change. */ static const unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60; /** Block download timeout base, expressed in millionths of the block interval * (i.e. 10 min) */ static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000; /** * Additional block download timeout per parallel downloading peer (i.e. 5 min) */ static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000; static const unsigned int DEFAULT_LIMITFREERELAY = 0; static const bool DEFAULT_RELAYPRIORITY = true; static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60; /** * Maximum age of our tip in seconds for us to be considered current for fee * estimation. */ static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60; /** Default for -permitbaremultisig */ static const bool DEFAULT_PERMIT_BAREMULTISIG = true; static const bool DEFAULT_CHECKPOINTS_ENABLED = true; static const bool DEFAULT_TXINDEX = false; static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100; /** Default for -persistmempool */ static const bool DEFAULT_PERSIST_MEMPOOL = true; /** Default for using fee filter */ static const bool DEFAULT_FEEFILTER = true; /** * Maximum number of headers to announce when relaying blocks with headers * message. */ static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8; /** Maximum number of unconnecting headers announcements before DoS score */ static const int MAX_UNCONNECTING_HEADERS = 10; static const bool DEFAULT_PEERBLOOMFILTERS = true; /** Default for -stopatheight */ static const int DEFAULT_STOPATHEIGHT = 0; extern CScript COINBASE_FLAGS; extern CCriticalSection cs_main; extern CTxMemPool mempool; extern uint64_t nLastBlockTx; extern uint64_t nLastBlockSize; extern const std::string strMessageMagic; extern CWaitableCriticalSection csBestBlock; extern CConditionVariable cvBlockChange; extern std::atomic_bool fImporting; extern bool fReindex; extern int nScriptCheckThreads; extern bool fTxIndex; extern bool fIsBareMultisigStd; extern bool fRequireStandard; extern bool fCheckBlockIndex; extern bool fCheckpointsEnabled; extern size_t nCoinCacheUsage; /** * Absolute maximum transaction fee (in satoshis) used by wallet and mempool * (rejects high fee in sendrawtransaction) */ extern Amount maxTxFee; /** * If the tip is older than this (in seconds), the node is considered to be in * initial block download. */ extern int64_t nMaxTipAge; /** * Block hash whose ancestors we will assume to have valid scripts without * checking them. */ extern uint256 hashAssumeValid; /** * Minimum work we will assume exists on some valid chain. */ extern arith_uint256 nMinimumChainWork; /** * Best header we've seen so far (used for getheaders queries' starting points). */ extern CBlockIndex *pindexBestHeader; /** Minimum disk space required - used in CheckDiskSpace() */ static const uint64_t nMinDiskSpace = 52428800; /** Pruning-related variables and constants */ /** True if any block files have ever been pruned. */ extern bool fHavePruned; /** True if we're running in -prune mode. */ extern bool fPruneMode; /** Number of MiB of block files that we're trying to stay below. */ extern uint64_t nPruneTarget; /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of * chainActive.Tip() will not be pruned. */ static const unsigned int MIN_BLOCKS_TO_KEEP = 288; static const signed int DEFAULT_CHECKBLOCKS = 6; static const unsigned int DEFAULT_CHECKLEVEL = 3; /** * Require that user allocate at least 550MB for block & undo files (blk???.dat * and rev???.dat) * At 1MB per block, 288 blocks = 288MB. * Add 15% for Undo data = 331MB * Add 20% for Orphan block rate = 397MB * We want the low water mark after pruning to be at least 397 MB and since we * prune in full block file chunks, we need the high water mark which triggers * the prune to be one 128MB block file + added 15% undo data = 147MB greater * for a total of 545MB. Setting the target to > than 550MB will make it likely * we can respect the target. */ static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024; class BlockValidationOptions { private: bool checkPoW : 1; bool checkMerkleRoot : 1; public: // Do full validation by default BlockValidationOptions() : checkPoW(true), checkMerkleRoot(true) {} BlockValidationOptions(bool checkPoWIn, bool checkMerkleRootIn) : checkPoW(checkPoWIn), checkMerkleRoot(checkMerkleRootIn) {} bool shouldValidatePoW() const { return checkPoW; } bool shouldValidateMerkleRoot() const { return checkMerkleRoot; } }; /** * Process an incoming block. This only returns after the best known valid * block is made active. Note that it does not, however, guarantee that the * specific block passed to it has been checked for validity! * * If you want to *possibly* get feedback on whether pblock is valid, you must * install a CValidationInterface (see validationinterface.h) - this will have * its BlockChecked method called whenever *any* block completes validation. * * Note that we guarantee that either the proof-of-work is valid on pblock, or * (and possibly also) BlockChecked will have been called. * * Call without cs_main held. * * @param[in] config The global config. * @param[in] pblock The block we want to process. * @param[in] fForceProcessing Process this block even if unrequested; used * for non-network block sources and whitelisted peers. * @param[out] fNewBlock A boolean which is set to indicate if the block was * first received via this call. * @return True if the block is accepted as a valid block. */ bool ProcessNewBlock(const Config &config, const std::shared_ptr pblock, bool fForceProcessing, bool *fNewBlock); /** * Process incoming block headers. * * Call without cs_main held. * * @param[in] config The global config. * @param[in] block The block headers themselves. * @param[out] state This may be set to an Error state if any error occurred * processing them. * @param[out] ppindex If set, the pointer will be set to point to the last new * block index object for the given headers. * @return True if block headers were accepted as valid. */ bool ProcessNewBlockHeaders(const Config &config, const std::vector &block, CValidationState &state, const CBlockIndex **ppindex = nullptr); /** * Check whether enough disk space is available for an incoming block. */ bool CheckDiskSpace(uint64_t nAdditionalBytes = 0); /** * Open a block file (blk?????.dat). */ FILE *OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false); /** * Translation to a filesystem path. */ fs::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix); /** * Import blocks from an external file. */ bool LoadExternalBlockFile(const Config &config, FILE *fileIn, CDiskBlockPos *dbp = nullptr); /** * Initialize a new block tree database + block data on disk. */ bool InitBlockIndex(const Config &config); /** * Load the block tree and coins database from disk. */ bool LoadBlockIndex(const Config &config); /** * Update the chain tip based on database information. */ void LoadChainTip(const CChainParams &chainparams); /** * Unload database information. */ void UnloadBlockIndex(); /** * Run an instance of the script checking thread. */ void ThreadScriptCheck(); /** * Check whether we are doing an initial block download (synchronizing from disk * or network) */ bool IsInitialBlockDownload(); /** * Format a string that describes several potential problems detected by the * core. * strFor can have three values: * - "rpc": get critical warnings, which should put the client in safe mode if * non-empty * - "statusbar": get all warnings * - "gui": get all warnings, translated (where possible) for GUI * This function only returns the highest priority warning of the set selected * by strFor. */ std::string GetWarnings(const std::string &strFor); /** * Retrieve a transaction (from memory pool, or from disk, if possible). */ bool GetTransaction(const Config &config, const TxId &txid, CTransactionRef &tx, uint256 &hashBlock, bool fAllowSlow = false); /** * Find the best known block, and make it the active tip of the block chain. * If it fails, the tip is not updated. * * pblock is either nullptr or a pointer to a block that is already loaded * in memory (to avoid loading it from disk again). * * Returns true if a new chain tip was set. */ bool ActivateBestChain( const Config &config, CValidationState &state, std::shared_ptr pblock = std::shared_ptr()); Amount GetBlockSubsidy(int nHeight, const Consensus::Params &consensusParams); /** * Guess verification progress (as a fraction between 0.0=genesis and * 1.0=current tip). */ double GuessVerificationProgress(const ChainTxData &data, CBlockIndex *pindex); /** * Mark one block file as pruned. */ void PruneOneBlockFile(const int fileNumber); /** * Actually unlink the specified files */ void UnlinkPrunedFiles(const std::set &setFilesToPrune); /** Create a new block index entry for a given block hash */ CBlockIndex *InsertBlockIndex(uint256 hash); /** Flush all state, indexes and buffers to disk. */ void FlushStateToDisk(); /** Prune block files and flush state to disk. */ void PruneAndFlush(); /** Prune block files up to a given height */ void PruneBlockFilesManual(int nPruneUpToHeight); /** Check if UAHF has activated. */ bool IsUAHFenabled(const Config &config, const CBlockIndex *pindexPrev); /** Check if DAA HF has activated. */ bool IsDAAEnabled(const Config &config, const CBlockIndex *pindexPrev); /** Check if Nov 15, 2018 HF has activated. */ bool IsMagneticAnomalyEnabled(const Config &config, const CBlockIndex *pindexPrev); /** * (try to) add transaction to memory pool */ bool AcceptToMemoryPool(const Config &config, CTxMemPool &pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree, bool *pfMissingInputs, bool fOverrideMempoolLimit = false, const Amount nAbsurdFee = Amount(0)); /** Convert CValidationState to a human-readable message for logging */ std::string FormatStateMessage(const CValidationState &state); /** * Count ECDSA signature operations the old-fashioned (pre-0.6) way * @return number of sigops this transaction's outputs will produce when spent * @see CTransaction::FetchInputs */ uint64_t GetSigOpCountWithoutP2SH(const CTransaction &tx, uint32_t flags); /** * Count ECDSA signature operations in pay-to-script-hash inputs. * * @param[in] mapInputs Map of previous transactions that have outputs we're * spending * @return maximum number of sigops required to validate this transaction's * inputs * @see CTransaction::FetchInputs */ uint64_t GetP2SHSigOpCount(const CTransaction &tx, const CCoinsViewCache &mapInputs, uint32_t flags); /** * Compute total signature operation of a transaction. * @param[in] tx Transaction for which we are computing the cost * @param[in] inputs Map of previous transactions that have outputs we're * spending * @param[in] flags Script verification flags * @return Total signature operation cost of tx */ uint64_t GetTransactionSigOpCount(const CTransaction &tx, const CCoinsViewCache &inputs, uint32_t flags); /** * Check whether all inputs of this transaction are valid (no double spends, * scripts & sigs, amounts). This does not modify the UTXO set. * * If pvChecks is not nullptr, script checks are pushed onto it instead of being * performed inline. Any script checks which are not necessary (eg due to script * execution cache hits) are, obviously, not pushed onto pvChecks/run. * * Setting sigCacheStore/scriptCacheStore to false will remove elements from the * corresponding cache which are matched. This is useful for checking blocks * where we will likely never need the cache entry again. */ bool CheckInputs(const CTransaction &tx, CValidationState &state, const CCoinsViewCache &view, bool fScriptChecks, const uint32_t flags, bool sigCacheStore, bool scriptCacheStore, const PrecomputedTransactionData &txdata, std::vector *pvChecks = nullptr); /** * Mark all the coins corresponding to a given transaction inputs as spent. */ void SpendCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo, int nHeight); /** * Apply the effects of this transaction on the UTXO set represented by view. */ void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight); void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo, int nHeight); /** Transaction validation functions */ /** * Context-independent validity checks for coinbase and non-coinbase * transactions. */ bool CheckRegularTransaction(const CTransaction &tx, CValidationState &state, bool fCheckDuplicateInputs = true); bool CheckCoinbase(const CTransaction &tx, CValidationState &state, bool fCheckDuplicateInputs = true); namespace Consensus { /** * Check whether all inputs of this transaction are valid (no double spends and * amounts). This does not modify the UTXO set. This does not check scripts and * sigs. Preconditions: tx.IsCoinBase() is false. */ bool CheckTxInputs(const CTransaction &tx, CValidationState &state, const CCoinsViewCache &inputs, int nSpendHeight); } // namespace Consensus /** * Test whether the LockPoints height and time are still valid on the current * chain. */ bool TestLockPointValidity(const LockPoints *lp); /** * Check if transaction is final per BIP 68 sequence numbers and can be included * in a block. Consensus critical. Takes as input a list of heights at which * tx's inputs (in order) confirmed. */ bool SequenceLocks(const CTransaction &tx, int flags, std::vector *prevHeights, const CBlockIndex &block); /** * Check if transaction will be BIP 68 final in the next block to be created. * * Simulates calling SequenceLocks() with data from the tip of the current * active chain. Optionally stores in LockPoints the resulting height and time * calculated and the hash of the block needed for calculation or skips the * calculation and uses the LockPoints passed in for evaluation. The LockPoints * should not be considered valid if CheckSequenceLocks returns false. * * See consensus/consensus.h for flag definitions. */ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints *lp = nullptr, bool useExistingLockPoints = false); /** * Closure representing one script verification. * Note that this stores references to the spending transaction. */ class CScriptCheck { private: CScript scriptPubKey; Amount amount; const CTransaction *ptxTo; unsigned int nIn; uint32_t nFlags; bool cacheStore; ScriptError error; PrecomputedTransactionData txdata; public: CScriptCheck() : amount(0), ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata() {} CScriptCheck(const CScript &scriptPubKeyIn, const Amount amountIn, const CTransaction &txToIn, unsigned int nInIn, uint32_t nFlagsIn, bool cacheIn, const PrecomputedTransactionData &txdataIn) : scriptPubKey(scriptPubKeyIn), amount(amountIn), ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR), txdata(txdataIn) {} bool operator()(); void swap(CScriptCheck &check) { scriptPubKey.swap(check.scriptPubKey); std::swap(ptxTo, check.ptxTo); std::swap(amount, check.amount); std::swap(nIn, check.nIn); std::swap(nFlags, check.nFlags); std::swap(cacheStore, check.cacheStore); std::swap(error, check.error); std::swap(txdata, check.txdata); } ScriptError GetScriptError() const { return error; } }; /** Functions for disk access for blocks */ bool ReadBlockFromDisk(CBlock &block, const CDiskBlockPos &pos, const Config &config); bool ReadBlockFromDisk(CBlock &block, const CBlockIndex *pindex, const Config &config); /** Functions for validating blocks and updating the block tree */ /** * Context-independent validity checks. * * Returns true if the provided block is valid (has valid header, * transactions are valid, block is a valid size, etc.) */ bool CheckBlock( const Config &Config, const CBlock &block, CValidationState &state, BlockValidationOptions validationOptions = BlockValidationOptions()); /** * Context dependent validity checks for non coinbase transactions. This * doesn't check the validity of the transaction against the UTXO set, but * simply characteristic that are suceptible to change over time such as feature * activation/deactivation and CLTV. */ bool ContextualCheckTransaction(const Config &config, const CTransaction &tx, CValidationState &state, int nHeight, int64_t nLockTimeCutoff, int64_t nMedianTimePast); /** * This is a variant of ContextualCheckTransaction which computes the contextual * check for a transaction based on the chain tip. * * See consensus/consensus.h for flag definitions. */ bool ContextualCheckTransactionForCurrentBlock(const Config &config, const CTransaction &tx, CValidationState &state, int flags = -1); /** * Check a block is completely valid from start to finish (only works on top of * our current best block, with cs_main held) */ bool TestBlockValidity( const Config &config, CValidationState &state, const CBlock &block, CBlockIndex *pindexPrev, BlockValidationOptions validationOptions = BlockValidationOptions()); /** * When there are blocks in the active chain with missing data, rewind the * chainstate and remove them from the block index. */ bool RewindBlockIndex(const Config &config); /** * RAII wrapper for VerifyDB: Verify consistency of the block and coin * databases. */ class CVerifyDB { public: CVerifyDB(); ~CVerifyDB(); bool VerifyDB(const Config &config, CCoinsView *coinsview, int nCheckLevel, int nCheckDepth); }; /** Replay blocks that aren't fully applied to the database. */ bool ReplayBlocks(const Config &config, CCoinsView *view); /** Find the last common block between the parameter chain and a locator. */ CBlockIndex *FindForkInGlobalIndex(const CChain &chain, const CBlockLocator &locator); /** * Treats a block as if it were received before others with the same work, * making it the active chain tip if applicable. Successive calls to * PreciousBlock() will override the effects of earlier calls. The effects of * calls to PreciousBlock() are not retained across restarts. * * Returns true if the provided block index successfully became the chain tip. */ bool PreciousBlock(const Config &config, CValidationState &state, CBlockIndex *pindex); /** Mark a block as invalid. */ bool InvalidateBlock(const Config &config, CValidationState &state, CBlockIndex *pindex); /** Remove invalidity status from a block and its descendants. */ bool ResetBlockFailureFlags(CBlockIndex *pindex); /** The currently-connected chain of blocks (protected by cs_main). */ extern CChain chainActive; /** Global variable that points to the active CCoinsView (protected by cs_main) */ extern CCoinsViewCache *pcoinsTip; /** Global variable that points to the active block tree (protected by cs_main) */ extern CBlockTreeDB *pblocktree; /** * Return the spend height, which is one more than the inputs.GetBestBlock(). * While checking, GetBestBlock() refers to the parent block. (protected by * cs_main) * This is also true for mempool checks. */ int GetSpendHeight(const CCoinsViewCache &inputs); extern VersionBitsCache versionbitscache; /** * Determine what nVersion a new block should use. */ int32_t ComputeBlockVersion(const CBlockIndex *pindexPrev, const Consensus::Params ¶ms); /** * Reject codes greater or equal to this can be returned by AcceptToMemPool for * transactions, to signal internal conditions. They cannot and should not be * sent over the P2P network. */ static const unsigned int REJECT_INTERNAL = 0x100; /** Too high fee. Can not be triggered by P2P transactions */ static const unsigned int REJECT_HIGHFEE = 0x100; /** Transaction is already known (either in mempool or blockchain) */ static const unsigned int REJECT_ALREADY_KNOWN = 0x101; /** Transaction conflicts with a transaction already known */ static const unsigned int REJECT_CONFLICT = 0x102; /** Get block file info entry for one block file */ CBlockFileInfo *GetBlockFileInfo(size_t n); /** Dump the mempool to disk. */ void DumpMempool(); /** Load the mempool from disk. */ bool LoadMempool(const Config &config); #endif // BITCOIN_VALIDATION_H