init.cpp
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init.cpp
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	// Copyright (c) 2009-2010 Satoshi Nakamoto
	// Copyright (c) 2009-2015 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#if defined(HAVE_CONFIG_H)
	#include "config/bitcoin-config.h"
	#endif

	#include "init.h"

	#include "addrman.h"
	#include "amount.h"
	#include "chain.h"
	#include "chainparams.h"
	#include "checkpoints.h"
	#include "compat/sanity.h"
	#include "consensus/validation.h"
	#include "httpserver.h"
	#include "httprpc.h"
	#include "key.h"
	#include "main.h"
	#include "miner.h"
	#include "netbase.h"
	#include "net.h"
	#include "policy/policy.h"
	#include "rpc/server.h"
	#include "rpc/register.h"
	#include "script/standard.h"
	#include "script/sigcache.h"
	#include "scheduler.h"
	#include "timedata.h"
	#include "txdb.h"
	#include "txmempool.h"
	#include "torcontrol.h"
	#include "ui_interface.h"
	#include "util.h"
	#include "utilmoneystr.h"
	#include "validationinterface.h"
	#ifdef ENABLE_WALLET
	#include "wallet/wallet.h"
	#endif
	#include <stdint.h>
	#include <stdio.h>
	#include <memory>

	#ifndef WIN32
	#include <signal.h>
	#endif

	#include <boost/algorithm/string/classification.hpp>
	#include <boost/algorithm/string/predicate.hpp>
	#include <boost/algorithm/string/replace.hpp>
	#include <boost/algorithm/string/split.hpp>
	#include <boost/bind.hpp>
	#include <boost/filesystem.hpp>
	#include <boost/function.hpp>
	#include <boost/interprocess/sync/file_lock.hpp>
	#include <boost/thread.hpp>
	#include <openssl/crypto.h>

	#if ENABLE_ZMQ
	#include "zmq/zmqnotificationinterface.h"
	#endif

	using namespace std;

	bool fFeeEstimatesInitialized = false;
	static const bool DEFAULT_PROXYRANDOMIZE = true;
	static const bool DEFAULT_REST_ENABLE = false;
	static const bool DEFAULT_DISABLE_SAFEMODE = false;
	static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;

	std::unique_ptr<CConnman> g_connman;

	#if ENABLE_ZMQ
	static CZMQNotificationInterface* pzmqNotificationInterface = NULL;
	#endif

	#ifdef WIN32
	// Win32 LevelDB doesn't use filedescriptors, and the ones used for
	// accessing block files don't count towards the fd_set size limit
	// anyway.
	#define MIN_CORE_FILEDESCRIPTORS 0
	#else
	#define MIN_CORE_FILEDESCRIPTORS 150
	#endif

	/** Used to pass flags to the Bind() function */
	enum BindFlags {
	BF_NONE = 0,
	BF_EXPLICIT = (1U << 0),
	BF_REPORT_ERROR = (1U << 1),
	BF_WHITELIST = (1U << 2),
	};

	static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";

	//////////////////////////////////////////////////////////////////////////////
	//
	// Shutdown
	//

	//
	// Thread management and startup/shutdown:
	//
	// The network-processing threads are all part of a thread group
	// created by AppInit() or the Qt main() function.
	//
	// A clean exit happens when StartShutdown() or the SIGTERM
	// signal handler sets fRequestShutdown, which triggers
	// the DetectShutdownThread(), which interrupts the main thread group.
	// DetectShutdownThread() then exits, which causes AppInit() to
	// continue (it .joins the shutdown thread).
	// Shutdown() is then
	// called to clean up database connections, and stop other
	// threads that should only be stopped after the main network-processing
	// threads have exited.
	//
	// Note that if running -daemon the parent process returns from AppInit2
	// before adding any threads to the threadGroup, so .join_all() returns
	// immediately and the parent exits from main().
	//
	// Shutdown for Qt is very similar, only it uses a QTimer to detect
	// fRequestShutdown getting set, and then does the normal Qt
	// shutdown thing.
	//

	std::atomic<bool> fRequestShutdown(false);

	void StartShutdown()
	{
	fRequestShutdown = true;
	}
	bool ShutdownRequested()
	{
	return fRequestShutdown;
	}

	/**
	* This is a minimally invasive approach to shutdown on LevelDB read errors from the
	* chainstate, while keeping user interface out of the common library, which is shared
	* between bitcoind, and bitcoin-qt and non-server tools.
	*/
	class CCoinsViewErrorCatcher : public CCoinsViewBacked
	{
	public:
	CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
	bool GetCoins(const uint256 &txid, CCoins &coins) const {
	try {
	return CCoinsViewBacked::GetCoins(txid, coins);
	} catch(const std::runtime_error& e) {
	uiInterface.ThreadSafeMessageBox(_("Error reading from database, shutting down."), "", CClientUIInterface::MSG_ERROR);
	LogPrintf("Error reading from database: %s\n", e.what());
	// Starting the shutdown sequence and returning false to the caller would be
	// interpreted as 'entry not found' (as opposed to unable to read data), and
	// could lead to invalid interpretation. Just exit immediately, as we can't
	// continue anyway, and all writes should be atomic.
	abort();
	}
	}
	// Writes do not need similar protection, as failure to write is handled by the caller.
	};

	static CCoinsViewDB *pcoinsdbview = NULL;
	static CCoinsViewErrorCatcher *pcoinscatcher = NULL;
	static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;

	void Interrupt(boost::thread_group& threadGroup)
	{
	InterruptHTTPServer();
	InterruptHTTPRPC();
	InterruptRPC();
	InterruptREST();
	InterruptTorControl();
	threadGroup.interrupt_all();
	}

	void Shutdown()
	{
	LogPrintf("%s: In progress...\n", __func__);
	static CCriticalSection cs_Shutdown;
	TRY_LOCK(cs_Shutdown, lockShutdown);
	if (!lockShutdown)
	return;

	/// Note: Shutdown() must be able to handle cases in which AppInit2() failed part of the way,
	/// for example if the data directory was found to be locked.
	/// Be sure that anything that writes files or flushes caches only does this if the respective
	/// module was initialized.
	RenameThread("bitcoin-shutoff");
	mempool.AddTransactionsUpdated(1);

	StopHTTPRPC();
	StopREST();
	StopRPC();
	StopHTTPServer();
	#ifdef ENABLE_WALLET
	if (pwalletMain)
	pwalletMain->Flush(false);
	#endif
	MapPort(false);
	g_connman.reset();

	StopTorControl();
	UnregisterNodeSignals(GetNodeSignals());

	if (fFeeEstimatesInitialized)
	{
	boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
	CAutoFile est_fileout(fopen(est_path.string().c_str(), "wb"), SER_DISK, CLIENT_VERSION);
	if (!est_fileout.IsNull())
	mempool.WriteFeeEstimates(est_fileout);
	else
	LogPrintf("%s: Failed to write fee estimates to %s\n", __func__, est_path.string());
	fFeeEstimatesInitialized = false;
	}

	{
	LOCK(cs_main);
	if (pcoinsTip != NULL) {
	FlushStateToDisk();
	}
	delete pcoinsTip;
	pcoinsTip = NULL;
	delete pcoinscatcher;
	pcoinscatcher = NULL;
	delete pcoinsdbview;
	pcoinsdbview = NULL;
	delete pblocktree;
	pblocktree = NULL;
	}
	#ifdef ENABLE_WALLET
	if (pwalletMain)
	pwalletMain->Flush(true);
	#endif

	#if ENABLE_ZMQ
	if (pzmqNotificationInterface) {
	UnregisterValidationInterface(pzmqNotificationInterface);
	delete pzmqNotificationInterface;
	pzmqNotificationInterface = NULL;
	}
	#endif

	#ifndef WIN32
	try {
	boost::filesystem::remove(GetPidFile());
	} catch (const boost::filesystem::filesystem_error& e) {
	LogPrintf("%s: Unable to remove pidfile: %s\n", __func__, e.what());
	}
	#endif
	UnregisterAllValidationInterfaces();
	#ifdef ENABLE_WALLET
	delete pwalletMain;
	pwalletMain = NULL;
	#endif
	globalVerifyHandle.reset();
	ECC_Stop();
	LogPrintf("%s: done\n", __func__);
	}

	/**
	* Signal handlers are very limited in what they are allowed to do, so:
	*/
	void HandleSIGTERM(int)
	{
	fRequestShutdown = true;
	}

	void HandleSIGHUP(int)
	{
	fReopenDebugLog = true;
	}

	bool static Bind(CConnman& connman, const CService &addr, unsigned int flags) {
	if (!(flags & BF_EXPLICIT) && IsLimited(addr))
	return false;
	std::string strError;
	if (!connman.BindListenPort(addr, strError, (flags & BF_WHITELIST) != 0)) {
	if (flags & BF_REPORT_ERROR)
	return InitError(strError);
	return false;
	}
	return true;
	}
	void OnRPCStarted()
	{
	uiInterface.NotifyBlockTip.connect(&RPCNotifyBlockChange);
	}

	void OnRPCStopped()
	{
	uiInterface.NotifyBlockTip.disconnect(&RPCNotifyBlockChange);
	RPCNotifyBlockChange(false, nullptr);
	cvBlockChange.notify_all();
	LogPrint("rpc", "RPC stopped.\n");
	}

	void OnRPCPreCommand(const CRPCCommand& cmd)
	{
	// Observe safe mode
	string strWarning = GetWarnings("rpc");
	if (strWarning != "" && !GetBoolArg("-disablesafemode", DEFAULT_DISABLE_SAFEMODE) &&
	!cmd.okSafeMode)
	throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, string("Safe mode: ") + strWarning);
	}

	std::string HelpMessage(HelpMessageMode mode)
	{
	const bool showDebug = GetBoolArg("-help-debug", false);

	// When adding new options to the categories, please keep and ensure alphabetical ordering.
	// Do not translate _(...) -help-debug options, Many technical terms, and only a very small audience, so is unnecessary stress to translators.
	string strUsage = HelpMessageGroup(_("Options:"));
	strUsage += HelpMessageOpt("-?", _("Print this help message and exit"));
	strUsage += HelpMessageOpt("-version", _("Print version and exit"));
	strUsage += HelpMessageOpt("-alertnotify=<cmd>", _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)"));
	strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash)"));
	if (showDebug)
	strUsage += HelpMessageOpt("-blocksonly", strprintf(_("Whether to operate in a blocks only mode (default: %u)"), DEFAULT_BLOCKSONLY));
	strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), DEFAULT_CHECKBLOCKS));
	strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), DEFAULT_CHECKLEVEL));
	strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));
	if (mode == HMM_BITCOIND)
	{
	#ifndef WIN32
	strUsage += HelpMessageOpt("-daemon", _("Run in the background as a daemon and accept commands"));
	#endif
	}
	strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));
	strUsage += HelpMessageOpt("-dbcache=<n>", strprintf(_("Set database cache size in megabytes (%d to %d, default: %d)"), nMinDbCache, nMaxDbCache, nDefaultDbCache));
	if (showDebug)
	strUsage += HelpMessageOpt("-feefilter", strprintf("Tell other nodes to filter invs to us by our mempool min fee (default: %u)", DEFAULT_FEEFILTER));
	strUsage += HelpMessageOpt("-loadblock=<file>", _("Imports blocks from external blk000??.dat file on startup"));
	strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));
	strUsage += HelpMessageOpt("-maxmempool=<n>", strprintf(_("Keep the transaction memory pool below <n> megabytes (default: %u)"), DEFAULT_MAX_MEMPOOL_SIZE));
	strUsage += HelpMessageOpt("-mempoolexpiry=<n>", strprintf(_("Do not keep transactions in the mempool longer than <n> hours (default: %u)"), DEFAULT_MEMPOOL_EXPIRY));
	strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"),
	-GetNumCores(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS));
	#ifndef WIN32
	strUsage += HelpMessageOpt("-pid=<file>", strprintf(_("Specify pid file (default: %s)"), BITCOIN_PID_FILENAME));
	#endif
	strUsage += HelpMessageOpt("-prune=<n>", strprintf(_("Reduce storage requirements by pruning (deleting) old blocks. This mode is incompatible with -txindex and -rescan. "
	"Warning: Reverting this setting requires re-downloading the entire blockchain. "
	"(default: 0 = disable pruning blocks, >%u = target size in MiB to use for block files)"), MIN_DISK_SPACE_FOR_BLOCK_FILES / 1024 / 1024));
	strUsage += HelpMessageOpt("-reindex-chainstate", _("Rebuild chain state from the currently indexed blocks"));
	strUsage += HelpMessageOpt("-reindex", _("Rebuild chain state and block index from the blk*.dat files on disk"));
	#ifndef WIN32
	strUsage += HelpMessageOpt("-sysperms", _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)"));
	#endif
	strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), DEFAULT_TXINDEX));

	strUsage += HelpMessageGroup(_("Connection options:"));
	strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open"));
	strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD));
	strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME));
	strUsage += HelpMessageOpt("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"));
	strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s)"));
	strUsage += HelpMessageOpt("-discover", _("Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)"));
	strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + strprintf(_("(default: %u)"), DEFAULT_NAME_LOOKUP));
	strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)"));
	strUsage += HelpMessageOpt("-externalip=<ip>", _("Specify your own public address"));
	strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), DEFAULT_FORCEDNSSEED));
	strUsage += HelpMessageOpt("-listen", _("Accept connections from outside (default: 1 if no -proxy or -connect)"));
	strUsage += HelpMessageOpt("-listenonion", strprintf(_("Automatically create Tor hidden service (default: %d)"), DEFAULT_LISTEN_ONION));
	strUsage += HelpMessageOpt("-maxconnections=<n>", strprintf(_("Maintain at most <n> connections to peers (default: %u)"), DEFAULT_MAX_PEER_CONNECTIONS));
	strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXRECEIVEBUFFER));
	strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXSENDBUFFER));
	strUsage += HelpMessageOpt("-maxtimeadjustment", strprintf(_("Maximum allowed median peer time offset adjustment. Local perspective of time may be influenced by peers forward or backward by this amount. (default: %u seconds)"), DEFAULT_MAX_TIME_ADJUSTMENT));
	strUsage += HelpMessageOpt("-onion=<ip:port>", strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: %s)"), "-proxy"));
	strUsage += HelpMessageOpt("-onlynet=<net>", _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)"));
	strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), DEFAULT_PERMIT_BAREMULTISIG));
	strUsage += HelpMessageOpt("-peerbloomfilters", strprintf(_("Support filtering of blocks and transaction with bloom filters (default: %u)"), DEFAULT_PEERBLOOMFILTERS));
	strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), Params(CBaseChainParams::MAIN).GetDefaultPort(), Params(CBaseChainParams::TESTNET).GetDefaultPort()));
	strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));
	strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), DEFAULT_PROXYRANDOMIZE));
	strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
	strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
	strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));
	strUsage += HelpMessageOpt("-torpassword=<pass>", _("Tor control port password (default: empty)"));
	#ifdef USE_UPNP
	#if USE_UPNP
	strUsage += HelpMessageOpt("-upnp", _("Use UPnP to map the listening port (default: 1 when listening and no -proxy)"));
	#else
	strUsage += HelpMessageOpt("-upnp", strprintf(_("Use UPnP to map the listening port (default: %u)"), 0));
	#endif
	#endif
	strUsage += HelpMessageOpt("-whitebind=<addr>", _("Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6"));
	strUsage += HelpMessageOpt("-whitelist=<netmask>", _("Whitelist peers connecting from the given netmask or IP address. Can be specified multiple times.") +
	" " + _("Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway"));
	strUsage += HelpMessageOpt("-whitelistrelay", strprintf(_("Accept relayed transactions received from whitelisted peers even when not relaying transactions (default: %d)"), DEFAULT_WHITELISTRELAY));
	strUsage += HelpMessageOpt("-whitelistforcerelay", strprintf(_("Force relay of transactions from whitelisted peers even if they violate local relay policy (default: %d)"), DEFAULT_WHITELISTFORCERELAY));
	strUsage += HelpMessageOpt("-maxuploadtarget=<n>", strprintf(_("Tries to keep outbound traffic under the given target (in MiB per 24h), 0 = no limit (default: %d)"), DEFAULT_MAX_UPLOAD_TARGET));

	#ifdef ENABLE_WALLET
	strUsage += CWallet::GetWalletHelpString(showDebug);
	#endif

	#if ENABLE_ZMQ
	strUsage += HelpMessageGroup(_("ZeroMQ notification options:"));
	strUsage += HelpMessageOpt("-zmqpubhashblock=<address>", _("Enable publish hash block in <address>"));
	strUsage += HelpMessageOpt("-zmqpubhashtx=<address>", _("Enable publish hash transaction in <address>"));
	strUsage += HelpMessageOpt("-zmqpubrawblock=<address>", _("Enable publish raw block in <address>"));
	strUsage += HelpMessageOpt("-zmqpubrawtx=<address>", _("Enable publish raw transaction in <address>"));
	#endif

	strUsage += HelpMessageGroup(_("Debugging/Testing options:"));
	strUsage += HelpMessageOpt("-uacomment=<cmt>", _("Append comment to the user agent string"));
	if (showDebug)
	{
	strUsage += HelpMessageOpt("-checkblockindex", strprintf("Do a full consistency check for mapBlockIndex, setBlockIndexCandidates, chainActive and mapBlocksUnlinked occasionally. Also sets -checkmempool (default: %u)", Params(CBaseChainParams::MAIN).DefaultConsistencyChecks()));
	strUsage += HelpMessageOpt("-checkmempool=<n>", strprintf("Run checks every <n> transactions (default: %u)", Params(CBaseChainParams::MAIN).DefaultConsistencyChecks()));
	strUsage += HelpMessageOpt("-checkpoints", strprintf("Disable expensive verification for known chain history (default: %u)", DEFAULT_CHECKPOINTS_ENABLED));
	strUsage += HelpMessageOpt("-disablesafemode", strprintf("Disable safemode, override a real safe mode event (default: %u)", DEFAULT_DISABLE_SAFEMODE));
	strUsage += HelpMessageOpt("-testsafemode", strprintf("Force safe mode (default: %u)", DEFAULT_TESTSAFEMODE));
	strUsage += HelpMessageOpt("-dropmessagestest=<n>", "Randomly drop 1 of every <n> network messages");
	strUsage += HelpMessageOpt("-fuzzmessagestest=<n>", "Randomly fuzz 1 of every <n> network messages");
	strUsage += HelpMessageOpt("-stopafterblockimport", strprintf("Stop running after importing blocks from disk (default: %u)", DEFAULT_STOPAFTERBLOCKIMPORT));
	strUsage += HelpMessageOpt("-limitancestorcount=<n>", strprintf("Do not accept transactions if number of in-mempool ancestors is <n> or more (default: %u)", DEFAULT_ANCESTOR_LIMIT));
	strUsage += HelpMessageOpt("-limitancestorsize=<n>", strprintf("Do not accept transactions whose size with all in-mempool ancestors exceeds <n> kilobytes (default: %u)", DEFAULT_ANCESTOR_SIZE_LIMIT));
	strUsage += HelpMessageOpt("-limitdescendantcount=<n>", strprintf("Do not accept transactions if any ancestor would have <n> or more in-mempool descendants (default: %u)", DEFAULT_DESCENDANT_LIMIT));
	strUsage += HelpMessageOpt("-limitdescendantsize=<n>", strprintf("Do not accept transactions if any ancestor would have more than <n> kilobytes of in-mempool descendants (default: %u).", DEFAULT_DESCENDANT_SIZE_LIMIT));
	strUsage += HelpMessageOpt("-bip9params=deployment:start:end", "Use given start/end times for specified BIP9 deployment (regtest-only)");
	}
	string debugCategories = "addrman, alert, bench, coindb, db, http, libevent, lock, mempool, mempoolrej, net, proxy, prune, rand, reindex, rpc, selectcoins, tor, zmq"; // Don't translate these and qt below
	if (mode == HMM_BITCOIN_QT)
	debugCategories += ", qt";
	strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
	_("If <category> is not supplied or if <category> = 1, output all debugging information.") + _("<category> can be:") + " " + debugCategories + ".");
	if (showDebug)
	strUsage += HelpMessageOpt("-nodebug", "Turn off debugging messages, same as -debug=0");
	strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));
	strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), DEFAULT_LOGIPS));
	strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), DEFAULT_LOGTIMESTAMPS));
	if (showDebug)
	{
	strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));
	strUsage += HelpMessageOpt("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)");
	strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default: %u)", DEFAULT_LIMITFREERELAY));
	strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", DEFAULT_RELAYPRIORITY));
	strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf("Limit size of signature cache to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE));
	strUsage += HelpMessageOpt("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE));
	}
	strUsage += HelpMessageOpt("-minrelaytxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: %s)"),
	CURRENCY_UNIT, FormatMoney(DEFAULT_MIN_RELAY_TX_FEE)));
	strUsage += HelpMessageOpt("-maxtxfee=<amt>", strprintf(_("Maximum total fees (in %s) to use in a single wallet transaction or raw transaction; setting this too low may abort large transactions (default: %s)"),
	CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)));
	strUsage += HelpMessageOpt("-printtoconsole", _("Send trace/debug info to console instead of debug.log file"));
	if (showDebug)
	{
	strUsage += HelpMessageOpt("-printpriority", strprintf("Log transaction priority and fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY));
	}
	strUsage += HelpMessageOpt("-shrinkdebugfile", _("Shrink debug.log file on client startup (default: 1 when no -debug)"));

	AppendParamsHelpMessages(strUsage, showDebug);

	strUsage += HelpMessageGroup(_("Node relay options:"));
	if (showDebug)
	strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", !Params(CBaseChainParams::TESTNET).RequireStandard()));
	strUsage += HelpMessageOpt("-bytespersigop", strprintf(_("Equivalent bytes per sigop in transactions for relay and mining (default: %u)"), DEFAULT_BYTES_PER_SIGOP));
	strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));
	strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
	strUsage += HelpMessageOpt("-mempoolreplacement", strprintf(_("Enable transaction replacement in the memory pool (default: %u)"), DEFAULT_ENABLE_REPLACEMENT));

	strUsage += HelpMessageGroup(_("Block creation options:"));
	strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
	strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
	strUsage += HelpMessageOpt("-blockprioritysize=<n>", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE));
	if (showDebug)
	strUsage += HelpMessageOpt("-blockversion=<n>", "Override block version to test forking scenarios");

	strUsage += HelpMessageGroup(_("RPC server options:"));
	strUsage += HelpMessageOpt("-server", _("Accept command line and JSON-RPC commands"));
	strUsage += HelpMessageOpt("-rest", strprintf(_("Accept public REST requests (default: %u)"), DEFAULT_REST_ENABLE));
	strUsage += HelpMessageOpt("-rpcbind=<addr>", _("Bind to given address to listen for JSON-RPC connections. Use [host]:port notation for IPv6. This option can be specified multiple times (default: bind to all interfaces)"));
	strUsage += HelpMessageOpt("-rpccookiefile=<loc>", _("Location of the auth cookie (default: data dir)"));
	strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));
	strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));
	strUsage += HelpMessageOpt("-rpcauth=<userpw>", _("Username and hashed password for JSON-RPC connections. The field <userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical python script is included in share/rpcuser. This option can be specified multiple times"));
	strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), BaseParams(CBaseChainParams::MAIN).RPCPort(), BaseParams(CBaseChainParams::TESTNET).RPCPort()));
	strUsage += HelpMessageOpt("-rpcallowip=<ip>", _("Allow JSON-RPC connections from specified source. Valid for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This option can be specified multiple times"));
	strUsage += HelpMessageOpt("-rpcthreads=<n>", strprintf(_("Set the number of threads to service RPC calls (default: %d)"), DEFAULT_HTTP_THREADS));
	if (showDebug) {
	strUsage += HelpMessageOpt("-rpcworkqueue=<n>", strprintf("Set the depth of the work queue to service RPC calls (default: %d)", DEFAULT_HTTP_WORKQUEUE));
	strUsage += HelpMessageOpt("-rpcservertimeout=<n>", strprintf("Timeout during HTTP requests (default: %d)", DEFAULT_HTTP_SERVER_TIMEOUT));
	}

	return strUsage;
	}

	std::string LicenseInfo()
	{
	const std::string URL_SOURCE_CODE = "<https://github.com/bitcoin/bitcoin>";
	const std::string URL_WEBSITE = "<https://bitcoincore.org>";

	return CopyrightHolders(strprintf(_("Copyright (C) %i-%i"), 2009, COPYRIGHT_YEAR) + " ") + "\n" +
	"\n" +
	strprintf(_("Please contribute if you find %s useful. "
	"Visit %s for further information about the software."),
	PACKAGE_NAME, URL_WEBSITE) +
	"\n" +
	strprintf(_("The source code is available from %s."),
	URL_SOURCE_CODE) +
	"\n" +
	"\n" +
	_("This is experimental software.") + "\n" +
	strprintf(_("Distributed under the MIT software license, see the accompanying file %s or %s"), "COPYING", "<https://opensource.org/licenses/MIT>") + "\n" +
	"\n" +
	strprintf(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit %s and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard."), "<https://www.openssl.org>") +
	"\n";
	}

	static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex)
	{
	if (initialSync \|\| !pBlockIndex)
	return;

	std::string strCmd = GetArg("-blocknotify", "");

	boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
	boost::thread t(runCommand, strCmd); // thread runs free
	}

	static bool fHaveGenesis = false;
	static boost::mutex cs_GenesisWait;
	static CConditionVariable condvar_GenesisWait;

	static void BlockNotifyGenesisWait(bool, const CBlockIndex *pBlockIndex)
	{
	if (pBlockIndex != NULL) {
	{
	boost::unique_lock<boost::mutex> lock_GenesisWait(cs_GenesisWait);
	fHaveGenesis = true;
	}
	condvar_GenesisWait.notify_all();
	}
	}

	struct CImportingNow
	{
	CImportingNow() {
	assert(fImporting == false);
	fImporting = true;
	}

	~CImportingNow() {
	assert(fImporting == true);
	fImporting = false;
	}
	};


	// If we're using -prune with -reindex, then delete block files that will be ignored by the
	// reindex. Since reindexing works by starting at block file 0 and looping until a blockfile
	// is missing, do the same here to delete any later block files after a gap. Also delete all
	// rev files since they'll be rewritten by the reindex anyway. This ensures that vinfoBlockFile
	// is in sync with what's actually on disk by the time we start downloading, so that pruning
	// works correctly.
	void CleanupBlockRevFiles()
	{
	using namespace boost::filesystem;
	map<string, path> mapBlockFiles;

	// Glob all blk?????.dat and rev?????.dat files from the blocks directory.
	// Remove the rev files immediately and insert the blk file paths into an
	// ordered map keyed by block file index.
	LogPrintf("Removing unusable blk?????.dat and rev?????.dat files for -reindex with -prune\n");
	path blocksdir = GetDataDir() / "blocks";
	for (directory_iterator it(blocksdir); it != directory_iterator(); it++) {
	if (is_regular_file(*it) &&
	it->path().filename().string().length() == 12 &&
	it->path().filename().string().substr(8,4) == ".dat")
	{
	if (it->path().filename().string().substr(0,3) == "blk")
	mapBlockFiles[it->path().filename().string().substr(3,5)] = it->path();
	else if (it->path().filename().string().substr(0,3) == "rev")
	remove(it->path());
	}
	}

	// Remove all block files that aren't part of a contiguous set starting at
	// zero by walking the ordered map (keys are block file indices) by
	// keeping a separate counter. Once we hit a gap (or if 0 doesn't exist)
	// start removing block files.
	int nContigCounter = 0;
	BOOST_FOREACH(const PAIRTYPE(string, path)& item, mapBlockFiles) {
	if (atoi(item.first) == nContigCounter) {
	nContigCounter++;
	continue;
	}
	remove(item.second);
	}
	}

	void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
	{
	const CChainParams& chainparams = Params();
	RenameThread("bitcoin-loadblk");
	CImportingNow imp;

	// -reindex
	if (fReindex) {
	int nFile = 0;
	while (true) {
	CDiskBlockPos pos(nFile, 0);
	if (!boost::filesystem::exists(GetBlockPosFilename(pos, "blk")))
	break; // No block files left to reindex
	FILE *file = OpenBlockFile(pos, true);
	if (!file)
	break; // This error is logged in OpenBlockFile
	LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
	LoadExternalBlockFile(chainparams, file, &pos);
	nFile++;
	}
	pblocktree->WriteReindexing(false);
	fReindex = false;
	LogPrintf("Reindexing finished\n");
	// To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):
	InitBlockIndex(chainparams);
	}

	// hardcoded $DATADIR/bootstrap.dat
	boost::filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
	if (boost::filesystem::exists(pathBootstrap)) {
	FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
	if (file) {
	boost::filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
	LogPrintf("Importing bootstrap.dat...\n");
	LoadExternalBlockFile(chainparams, file);
	RenameOver(pathBootstrap, pathBootstrapOld);
	} else {
	LogPrintf("Warning: Could not open bootstrap file %s\n", pathBootstrap.string());
	}
	}

	// -loadblock=
	BOOST_FOREACH(const boost::filesystem::path& path, vImportFiles) {
	FILE *file = fopen(path.string().c_str(), "rb");
	if (file) {
	LogPrintf("Importing blocks file %s...\n", path.string());
	LoadExternalBlockFile(chainparams, file);
	} else {
	LogPrintf("Warning: Could not open blocks file %s\n", path.string());
	}
	}

	// scan for better chains in the block chain database, that are not yet connected in the active best chain
	CValidationState state;
	if (!ActivateBestChain(state, chainparams)) {
	LogPrintf("Failed to connect best block");
	StartShutdown();
	}

	if (GetBoolArg("-stopafterblockimport", DEFAULT_STOPAFTERBLOCKIMPORT)) {
	LogPrintf("Stopping after block import\n");
	StartShutdown();
	}
	}

	/** Sanity checks
	* Ensure that Bitcoin is running in a usable environment with all
	* necessary library support.
	*/
	bool InitSanityCheck(void)
	{
	if(!ECC_InitSanityCheck()) {
	InitError("Elliptic curve cryptography sanity check failure. Aborting.");
	return false;
	}
	if (!glibc_sanity_test() \|\| !glibcxx_sanity_test())
	return false;

	return true;
	}

	bool AppInitServers(boost::thread_group& threadGroup)
	{
	RPCServer::OnStarted(&OnRPCStarted);
	RPCServer::OnStopped(&OnRPCStopped);
	RPCServer::OnPreCommand(&OnRPCPreCommand);
	if (!InitHTTPServer())
	return false;
	if (!StartRPC())
	return false;
	if (!StartHTTPRPC())
	return false;
	if (GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST())
	return false;
	if (!StartHTTPServer())
	return false;
	return true;
	}

	// Parameter interaction based on rules
	void InitParameterInteraction()
	{
	// when specifying an explicit binding address, you want to listen on it
	// even when -connect or -proxy is specified
	if (mapArgs.count("-bind")) {
	if (SoftSetBoolArg("-listen", true))
	LogPrintf("%s: parameter interaction: -bind set -> setting -listen=1\n", __func__);
	}
	if (mapArgs.count("-whitebind")) {
	if (SoftSetBoolArg("-listen", true))
	LogPrintf("%s: parameter interaction: -whitebind set -> setting -listen=1\n", __func__);
	}

	if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0) {
	// when only connecting to trusted nodes, do not seed via DNS, or listen by default
	if (SoftSetBoolArg("-dnsseed", false))
	LogPrintf("%s: parameter interaction: -connect set -> setting -dnsseed=0\n", __func__);
	if (SoftSetBoolArg("-listen", false))
	LogPrintf("%s: parameter interaction: -connect set -> setting -listen=0\n", __func__);
	}

	if (mapArgs.count("-proxy")) {
	// to protect privacy, do not listen by default if a default proxy server is specified
	if (SoftSetBoolArg("-listen", false))
	LogPrintf("%s: parameter interaction: -proxy set -> setting -listen=0\n", __func__);
	// to protect privacy, do not use UPNP when a proxy is set. The user may still specify -listen=1
	// to listen locally, so don't rely on this happening through -listen below.
	if (SoftSetBoolArg("-upnp", false))
	LogPrintf("%s: parameter interaction: -proxy set -> setting -upnp=0\n", __func__);
	// to protect privacy, do not discover addresses by default
	if (SoftSetBoolArg("-discover", false))
	LogPrintf("%s: parameter interaction: -proxy set -> setting -discover=0\n", __func__);
	}

	if (!GetBoolArg("-listen", DEFAULT_LISTEN)) {
	// do not map ports or try to retrieve public IP when not listening (pointless)
	if (SoftSetBoolArg("-upnp", false))
	LogPrintf("%s: parameter interaction: -listen=0 -> setting -upnp=0\n", __func__);
	if (SoftSetBoolArg("-discover", false))
	LogPrintf("%s: parameter interaction: -listen=0 -> setting -discover=0\n", __func__);
	if (SoftSetBoolArg("-listenonion", false))
	LogPrintf("%s: parameter interaction: -listen=0 -> setting -listenonion=0\n", __func__);
	}

	if (mapArgs.count("-externalip")) {
	// if an explicit public IP is specified, do not try to find others
	if (SoftSetBoolArg("-discover", false))
	LogPrintf("%s: parameter interaction: -externalip set -> setting -discover=0\n", __func__);
	}

	if (GetBoolArg("-salvagewallet", false)) {
	// Rewrite just private keys: rescan to find transactions
	if (SoftSetBoolArg("-rescan", true))
	LogPrintf("%s: parameter interaction: -salvagewallet=1 -> setting -rescan=1\n", __func__);
	}

	// -zapwallettx implies a rescan
	if (GetBoolArg("-zapwallettxes", false)) {
	if (SoftSetBoolArg("-rescan", true))
	LogPrintf("%s: parameter interaction: -zapwallettxes=<mode> -> setting -rescan=1\n", __func__);
	}

	// disable walletbroadcast and whitelistrelay in blocksonly mode
	if (GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)) {
	if (SoftSetBoolArg("-whitelistrelay", false))
	LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -whitelistrelay=0\n", __func__);
	// walletbroadcast is disabled in CWallet::ParameterInteraction()
	}

	// Forcing relay from whitelisted hosts implies we will accept relays from them in the first place.
	if (GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {
	if (SoftSetBoolArg("-whitelistrelay", true))
	LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1\n", __func__);
	}
	}

	static std::string ResolveErrMsg(const char * const optname, const std::string& strBind)
	{
	return strprintf(_("Cannot resolve -%s address: '%s'"), optname, strBind);
	}

	void InitLogging()
	{
	fPrintToConsole = GetBoolArg("-printtoconsole", false);
	fLogTimestamps = GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);
	fLogTimeMicros = GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);
	fLogIPs = GetBoolArg("-logips", DEFAULT_LOGIPS);

	LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
	LogPrintf("Bitcoin version %s\n", FormatFullVersion());
	}

	/** Initialize bitcoin.
	* @pre Parameters should be parsed and config file should be read.
	*/
	bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
	{
	// ********************************************************* Step 1: setup
	#ifdef _MSC_VER
	// Turn off Microsoft heap dump noise
	_CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
	_CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0));
	#endif
	#if _MSC_VER >= 1400
	// Disable confusing "helpful" text message on abort, Ctrl-C
	_set_abort_behavior(0, _WRITE_ABORT_MSG \| _CALL_REPORTFAULT);
	#endif
	#ifdef WIN32
	// Enable Data Execution Prevention (DEP)
	// Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
	// A failure is non-critical and needs no further attention!
	#ifndef PROCESS_DEP_ENABLE
	// We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
	// which is not correct. Can be removed, when GCCs winbase.h is fixed!
	#define PROCESS_DEP_ENABLE 0x00000001
	#endif
	typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
	PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
	if (setProcDEPPol != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);
	#endif

	if (!SetupNetworking())
	return InitError("Initializing networking failed");

	#ifndef WIN32
	if (!GetBoolArg("-sysperms", false)) {
	umask(077);
	}

	// Clean shutdown on SIGTERM
	struct sigaction sa;
	sa.sa_handler = HandleSIGTERM;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGINT, &sa, NULL);

	// Reopen debug.log on SIGHUP
	struct sigaction sa_hup;
	sa_hup.sa_handler = HandleSIGHUP;
	sigemptyset(&sa_hup.sa_mask);
	sa_hup.sa_flags = 0;
	sigaction(SIGHUP, &sa_hup, NULL);

	// Ignore SIGPIPE, otherwise it will bring the daemon down if the client closes unexpectedly
	signal(SIGPIPE, SIG_IGN);
	#endif

	// ********************************************************* Step 2: parameter interactions
	const CChainParams& chainparams = Params();

	// also see: InitParameterInteraction()

	// if using block pruning, then disallow txindex
	if (GetArg("-prune", 0)) {
	if (GetBoolArg("-txindex", DEFAULT_TXINDEX))
	return InitError(_("Prune mode is incompatible with -txindex."));
	}

	// Make sure enough file descriptors are available
	int nBind = std::max((int)mapArgs.count("-bind") + (int)mapArgs.count("-whitebind"), 1);
	int nUserMaxConnections = GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
	int nMaxConnections = std::max(nUserMaxConnections, 0);

	// Trim requested connection counts, to fit into system limitations
	nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
	int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
	if (nFD < MIN_CORE_FILEDESCRIPTORS)
	return InitError(_("Not enough file descriptors available."));
	nMaxConnections = std::min(nFD - MIN_CORE_FILEDESCRIPTORS, nMaxConnections);

	if (nMaxConnections < nUserMaxConnections)
	InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, because of system limitations."), nUserMaxConnections, nMaxConnections));

	// ********************************************************* Step 3: parameter-to-internal-flags

	fDebug = !mapMultiArgs["-debug"].empty();
	// Special-case: if -debug=0/-nodebug is set, turn off debugging messages
	const vector<string>& categories = mapMultiArgs["-debug"];
	if (GetBoolArg("-nodebug", false) \|\| find(categories.begin(), categories.end(), string("0")) != categories.end())
	fDebug = false;

	// Check for -debugnet
	if (GetBoolArg("-debugnet", false))
	InitWarning(_("Unsupported argument -debugnet ignored, use -debug=net."));
	// Check for -socks - as this is a privacy risk to continue, exit here
	if (mapArgs.count("-socks"))
	return InitError(_("Unsupported argument -socks found. Setting SOCKS version isn't possible anymore, only SOCKS5 proxies are supported."));
	// Check for -tor - as this is a privacy risk to continue, exit here
	if (GetBoolArg("-tor", false))
	return InitError(_("Unsupported argument -tor found, use -onion."));

	if (GetBoolArg("-benchmark", false))
	InitWarning(_("Unsupported argument -benchmark ignored, use -debug=bench."));

	if (GetBoolArg("-whitelistalwaysrelay", false))
	InitWarning(_("Unsupported argument -whitelistalwaysrelay ignored, use -whitelistrelay and/or -whitelistforcerelay."));

	if (mapArgs.count("-blockminsize"))
	InitWarning("Unsupported argument -blockminsize ignored.");

	// Checkmempool and checkblockindex default to true in regtest mode
	int ratio = std::min<int>(std::max<int>(GetArg("-checkmempool", chainparams.DefaultConsistencyChecks() ? 1 : 0), 0), 1000000);
	if (ratio != 0) {
	mempool.setSanityCheck(1.0 / ratio);
	}
	fCheckBlockIndex = GetBoolArg("-checkblockindex", chainparams.DefaultConsistencyChecks());
	fCheckpointsEnabled = GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);

	// mempool limits
	int64_t nMempoolSizeMax = GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
	int64_t nMempoolSizeMin = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT) * 1000 * 40;
	if (nMempoolSizeMax < 0 \|\| nMempoolSizeMax < nMempoolSizeMin)
	return InitError(strprintf(_("-maxmempool must be at least %d MB"), std::ceil(nMempoolSizeMin / 1000000.0)));

	// -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
	nScriptCheckThreads = GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
	if (nScriptCheckThreads <= 0)
	nScriptCheckThreads += GetNumCores();
	if (nScriptCheckThreads <= 1)
	nScriptCheckThreads = 0;
	else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS)
	nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;

	fServer = GetBoolArg("-server", false);

	// block pruning; get the amount of disk space (in MiB) to allot for block & undo files
	int64_t nSignedPruneTarget = GetArg("-prune", 0) * 1024 * 1024;
	if (nSignedPruneTarget < 0) {
	return InitError(_("Prune cannot be configured with a negative value."));
	}
	nPruneTarget = (uint64_t) nSignedPruneTarget;
	if (nPruneTarget) {
	if (nPruneTarget < MIN_DISK_SPACE_FOR_BLOCK_FILES) {
	return InitError(strprintf(_("Prune configured below the minimum of %d MiB. Please use a higher number."), MIN_DISK_SPACE_FOR_BLOCK_FILES / 1024 / 1024));
	}
	LogPrintf("Prune configured to target %uMiB on disk for block and undo files.\n", nPruneTarget / 1024 / 1024);
	fPruneMode = true;
	}

	RegisterAllCoreRPCCommands(tableRPC);
	#ifdef ENABLE_WALLET
	RegisterWalletRPCCommands(tableRPC);
	#endif

	nConnectTimeout = GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
	if (nConnectTimeout <= 0)
	nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;

	// Fee-per-kilobyte amount considered the same as "free"
	// If you are mining, be careful setting this:
	// if you set it to zero then
	// a transaction spammer can cheaply fill blocks using
	// 1-satoshi-fee transactions. It should be set above the real
	// cost to you of processing a transaction.
	if (mapArgs.count("-minrelaytxfee"))
	{
	CAmount n = 0;
	if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
	::minRelayTxFee = CFeeRate(n);
	else
	return InitError(AmountErrMsg("minrelaytxfee", mapArgs["-minrelaytxfee"]));
	}

	fRequireStandard = !GetBoolArg("-acceptnonstdtxn", !Params().RequireStandard());
	if (Params().RequireStandard() && !fRequireStandard)
	return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
	nBytesPerSigOp = GetArg("-bytespersigop", nBytesPerSigOp);

	#ifdef ENABLE_WALLET
	if (!CWallet::ParameterInteraction())
	return false;
	#endif

	fIsBareMultisigStd = GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
	fAcceptDatacarrier = GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
	nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);

	// Option to startup with mocktime set (used for regression testing):
	SetMockTime(GetArg("-mocktime", 0)); // SetMockTime(0) is a no-op

	ServiceFlags nLocalServices = NODE_NETWORK;
	ServiceFlags nRelevantServices = NODE_NETWORK;

	if (GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
	nLocalServices = ServiceFlags(nLocalServices \| NODE_BLOOM);

	nMaxTipAge = GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);

	fEnableReplacement = GetBoolArg("-mempoolreplacement", DEFAULT_ENABLE_REPLACEMENT);
	if ((!fEnableReplacement) && mapArgs.count("-mempoolreplacement")) {
	// Minimal effort at forwards compatibility
	std::string strReplacementModeList = GetArg("-mempoolreplacement", ""); // default is impossible
	std::vector<std::string> vstrReplacementModes;
	boost::split(vstrReplacementModes, strReplacementModeList, boost::is_any_of(","));
	fEnableReplacement = (std::find(vstrReplacementModes.begin(), vstrReplacementModes.end(), "fee") != vstrReplacementModes.end());
	}

	if (!mapMultiArgs["-bip9params"].empty()) {
	// Allow overriding BIP9 parameters for testing
	if (!Params().MineBlocksOnDemand()) {
	return InitError("BIP9 parameters may only be overridden on regtest.");
	}
	const vector<string>& deployments = mapMultiArgs["-bip9params"];
	for (auto i : deployments) {
	std::vector<std::string> vDeploymentParams;
	boost::split(vDeploymentParams, i, boost::is_any_of(":"));
	if (vDeploymentParams.size() != 3) {
	return InitError("BIP9 parameters malformed, expecting deployment:start:end");
	}
	int64_t nStartTime, nTimeout;
	if (!ParseInt64(vDeploymentParams[1], &nStartTime)) {
	return InitError(strprintf("Invalid nStartTime (%s)", vDeploymentParams[1]));
	}
	if (!ParseInt64(vDeploymentParams[2], &nTimeout)) {
	return InitError(strprintf("Invalid nTimeout (%s)", vDeploymentParams[2]));
	}
	bool found = false;
	for (int j=0; j<(int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; ++j)
	{
	if (vDeploymentParams[0].compare(VersionBitsDeploymentInfo[j].name) == 0) {
	UpdateRegtestBIP9Parameters(Consensus::DeploymentPos(j), nStartTime, nTimeout);
	found = true;
	LogPrintf("Setting BIP9 activation parameters for %s to start=%ld, timeout=%ld\n", vDeploymentParams[0], nStartTime, nTimeout);
	break;
	}
	}
	if (!found) {
	return InitError(strprintf("Invalid deployment (%s)", vDeploymentParams[0]));
	}
	}
	}

	// ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log

	// Initialize elliptic curve code
	ECC_Start();
	globalVerifyHandle.reset(new ECCVerifyHandle());

	// Sanity check
	if (!InitSanityCheck())
	return InitError(strprintf(_("Initialization sanity check failed. %s is shutting down."), _(PACKAGE_NAME)));

	std::string strDataDir = GetDataDir().string();

	// Make sure only a single Bitcoin process is using the data directory.
	boost::filesystem::path pathLockFile = GetDataDir() / ".lock";
	FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
	if (file) fclose(file);

	try {
	static boost::interprocess::file_lock lock(pathLockFile.string().c_str());
	if (!lock.try_lock())
	return InitError(strprintf(_("Cannot obtain a lock on data directory %s. %s is probably already running."), strDataDir, _(PACKAGE_NAME)));
	} catch(const boost::interprocess::interprocess_exception& e) {
	return InitError(strprintf(_("Cannot obtain a lock on data directory %s. %s is probably already running.") + " %s.", strDataDir, _(PACKAGE_NAME), e.what()));
	}

	#ifndef WIN32
	CreatePidFile(GetPidFile(), getpid());
	#endif
	if (GetBoolArg("-shrinkdebugfile", !fDebug))
	ShrinkDebugFile();

	if (fPrintToDebugLog)
	OpenDebugLog();

	if (!fLogTimestamps)
	LogPrintf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()));
	LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
	LogPrintf("Using data directory %s\n", strDataDir);
	LogPrintf("Using config file %s\n", GetConfigFile().string());
	LogPrintf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);

	LogPrintf("Using %u threads for script verification\n", nScriptCheckThreads);
	if (nScriptCheckThreads) {
	for (int i=0; i<nScriptCheckThreads-1; i++)
	threadGroup.create_thread(&ThreadScriptCheck);
	}

	// Start the lightweight task scheduler thread
	CScheduler::Function serviceLoop = boost::bind(&CScheduler::serviceQueue, &scheduler);
	threadGroup.create_thread(boost::bind(&TraceThread<CScheduler::Function>, "scheduler", serviceLoop));

	/* Start the RPC server already. It will be started in "warmup" mode
	* and not really process calls already (but it will signify connections
	* that the server is there and will be ready later). Warmup mode will
	* be disabled when initialisation is finished.
	*/
	if (fServer)
	{
	uiInterface.InitMessage.connect(SetRPCWarmupStatus);
	if (!AppInitServers(threadGroup))
	return InitError(_("Unable to start HTTP server. See debug log for details."));
	}

	int64_t nStart;

	// ********************************************************* Step 5: verify wallet database integrity
	#ifdef ENABLE_WALLET
	if (!CWallet::Verify())
	return false;
	#endif
	// ********************************************************* Step 6: network initialization

	assert(!g_connman);
	g_connman = std::unique_ptr<CConnman>(new CConnman(GetRand(std::numeric_limits<uint64_t>::max()), GetRand(std::numeric_limits<uint64_t>::max())));
	CConnman& connman = *g_connman;

	RegisterNodeSignals(GetNodeSignals());

	// sanitize comments per BIP-0014, format user agent and check total size
	std::vector<string> uacomments;
	BOOST_FOREACH(string cmt, mapMultiArgs["-uacomment"])
	{
	if (cmt != SanitizeString(cmt, SAFE_CHARS_UA_COMMENT))
	return InitError(strprintf(_("User Agent comment (%s) contains unsafe characters."), cmt));
	uacomments.push_back(SanitizeString(cmt, SAFE_CHARS_UA_COMMENT));
	}
	strSubVersion = FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, uacomments);
	if (strSubVersion.size() > MAX_SUBVERSION_LENGTH) {
	return InitError(strprintf(_("Total length of network version string (%i) exceeds maximum length (%i). Reduce the number or size of uacomments."),
	strSubVersion.size(), MAX_SUBVERSION_LENGTH));
	}

	if (mapArgs.count("-onlynet")) {
	std::set<enum Network> nets;
	BOOST_FOREACH(const std::string& snet, mapMultiArgs["-onlynet"]) {
	enum Network net = ParseNetwork(snet);
	if (net == NET_UNROUTABLE)
	return InitError(strprintf(_("Unknown network specified in -onlynet: '%s'"), snet));
	nets.insert(net);
	}
	for (int n = 0; n < NET_MAX; n++) {
	enum Network net = (enum Network)n;
	if (!nets.count(net))
	SetLimited(net);
	}
	}

	if (mapArgs.count("-whitelist")) {
	BOOST_FOREACH(const std::string& net, mapMultiArgs["-whitelist"]) {
	CSubNet subnet;
	LookupSubNet(net.c_str(), subnet);
	if (!subnet.IsValid())
	return InitError(strprintf(_("Invalid netmask specified in -whitelist: '%s'"), net));
	connman.AddWhitelistedRange(subnet);
	}
	}

	bool proxyRandomize = GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
	// -proxy sets a proxy for all outgoing network traffic
	// -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
	std::string proxyArg = GetArg("-proxy", "");
	SetLimited(NET_TOR);
	if (proxyArg != "" && proxyArg != "0") {
	CService resolved(LookupNumeric(proxyArg.c_str(), 9050));
	proxyType addrProxy = proxyType(resolved, proxyRandomize);
	if (!addrProxy.IsValid())
	return InitError(strprintf(_("Invalid -proxy address: '%s'"), proxyArg));

	SetProxy(NET_IPV4, addrProxy);
	SetProxy(NET_IPV6, addrProxy);
	SetProxy(NET_TOR, addrProxy);
	SetNameProxy(addrProxy);
	SetLimited(NET_TOR, false); // by default, -proxy sets onion as reachable, unless -noonion later
	}

	// -onion can be used to set only a proxy for .onion, or override normal proxy for .onion addresses
	// -noonion (or -onion=0) disables connecting to .onion entirely
	// An empty string is used to not override the onion proxy (in which case it defaults to -proxy set above, or none)
	std::string onionArg = GetArg("-onion", "");
	if (onionArg != "") {
	if (onionArg == "0") { // Handle -noonion/-onion=0
	SetLimited(NET_TOR); // set onions as unreachable
	} else {
	CService resolved(LookupNumeric(onionArg.c_str(), 9050));
	proxyType addrOnion = proxyType(resolved, proxyRandomize);
	if (!addrOnion.IsValid())
	return InitError(strprintf(_("Invalid -onion address: '%s'"), onionArg));
	SetProxy(NET_TOR, addrOnion);
	SetLimited(NET_TOR, false);
	}
	}

	// see Step 2: parameter interactions for more information about these
	fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
	fDiscover = GetBoolArg("-discover", true);
	fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
	fRelayTxes = !GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);

	if (fListen) {
	bool fBound = false;
	if (mapArgs.count("-bind") \|\| mapArgs.count("-whitebind")) {
	BOOST_FOREACH(const std::string& strBind, mapMultiArgs["-bind"]) {
	CService addrBind;
	if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false))
	return InitError(ResolveErrMsg("bind", strBind));
	fBound \|= Bind(connman, addrBind, (BF_EXPLICIT \| BF_REPORT_ERROR));
	}
	BOOST_FOREACH(const std::string& strBind, mapMultiArgs["-whitebind"]) {
	CService addrBind;
	if (!Lookup(strBind.c_str(), addrBind, 0, false))
	return InitError(ResolveErrMsg("whitebind", strBind));
	if (addrBind.GetPort() == 0)
	return InitError(strprintf(_("Need to specify a port with -whitebind: '%s'"), strBind));
	fBound \|= Bind(connman, addrBind, (BF_EXPLICIT \| BF_REPORT_ERROR \| BF_WHITELIST));
	}
	}
	else {
	struct in_addr inaddr_any;
	inaddr_any.s_addr = INADDR_ANY;
	fBound \|= Bind(connman, CService(in6addr_any, GetListenPort()), BF_NONE);
	fBound \|= Bind(connman, CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE);
	}
	if (!fBound)
	return InitError(_("Failed to listen on any port. Use -listen=0 if you want this."));
	}

	if (mapArgs.count("-externalip")) {
	BOOST_FOREACH(const std::string& strAddr, mapMultiArgs["-externalip"]) {
	CService addrLocal;
	if (Lookup(strAddr.c_str(), addrLocal, GetListenPort(), fNameLookup) && addrLocal.IsValid())
	AddLocal(addrLocal, LOCAL_MANUAL);
	else
	return InitError(ResolveErrMsg("externalip", strAddr));
	}
	}

	BOOST_FOREACH(const std::string& strDest, mapMultiArgs["-seednode"])
	connman.AddOneShot(strDest);

	#if ENABLE_ZMQ
	pzmqNotificationInterface = CZMQNotificationInterface::CreateWithArguments(mapArgs);

	if (pzmqNotificationInterface) {
	RegisterValidationInterface(pzmqNotificationInterface);
	}
	#endif
	uint64_t nMaxOutboundLimit = 0; //unlimited unless -maxuploadtarget is set
	uint64_t nMaxOutboundTimeframe = MAX_UPLOAD_TIMEFRAME;

	if (mapArgs.count("-maxuploadtarget")) {
	nMaxOutboundLimit = GetArg("-maxuploadtarget", DEFAULT_MAX_UPLOAD_TARGET)10241024;
	}

	// ********************************************************* Step 7: load block chain

	fReindex = GetBoolArg("-reindex", false);
	bool fReindexChainState = GetBoolArg("-reindex-chainstate", false);

	// Upgrading to 0.8; hard-link the old blknnnn.dat files into /blocks/
	boost::filesystem::path blocksDir = GetDataDir() / "blocks";
	if (!boost::filesystem::exists(blocksDir))
	{
	boost::filesystem::create_directories(blocksDir);
	bool linked = false;
	for (unsigned int i = 1; i < 10000; i++) {
	boost::filesystem::path source = GetDataDir() / strprintf("blk%04u.dat", i);
	if (!boost::filesystem::exists(source)) break;
	boost::filesystem::path dest = blocksDir / strprintf("blk%05u.dat", i-1);
	try {
	boost::filesystem::create_hard_link(source, dest);
	LogPrintf("Hardlinked %s -> %s\n", source.string(), dest.string());
	linked = true;
	} catch (const boost::filesystem::filesystem_error& e) {
	// Note: hardlink creation failing is not a disaster, it just means
	// blocks will get re-downloaded from peers.
	LogPrintf("Error hardlinking blk%04u.dat: %s\n", i, e.what());
	break;
	}
	}
	if (linked)
	{
	fReindex = true;
	}
	}

	// cache size calculations
	int64_t nTotalCache = (GetArg("-dbcache", nDefaultDbCache) << 20);
	nTotalCache = std::max(nTotalCache, nMinDbCache << 20); // total cache cannot be less than nMinDbCache
	nTotalCache = std::min(nTotalCache, nMaxDbCache << 20); // total cache cannot be greater than nMaxDbcache
	int64_t nBlockTreeDBCache = nTotalCache / 8;
	nBlockTreeDBCache = std::min(nBlockTreeDBCache, (GetBoolArg("-txindex", DEFAULT_TXINDEX) ? nMaxBlockDBAndTxIndexCache : nMaxBlockDBCache) << 20);
	nTotalCache -= nBlockTreeDBCache;
	int64_t nCoinDBCache = std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23)); // use 25%-50% of the remainder for disk cache
	nCoinDBCache = std::min(nCoinDBCache, nMaxCoinsDBCache << 20); // cap total coins db cache
	nTotalCache -= nCoinDBCache;
	nCoinCacheUsage = nTotalCache; // the rest goes to in-memory cache
	LogPrintf("Cache configuration:\n");
	LogPrintf("* Using %.1fMiB for block index database\n", nBlockTreeDBCache * (1.0 / 1024 / 1024));
	LogPrintf("* Using %.1fMiB for chain state database\n", nCoinDBCache * (1.0 / 1024 / 1024));
	LogPrintf("* Using %.1fMiB for in-memory UTXO set\n", nCoinCacheUsage * (1.0 / 1024 / 1024));

	bool fLoaded = false;
	while (!fLoaded) {
	bool fReset = fReindex;
	std::string strLoadError;

	uiInterface.InitMessage(_("Loading block index..."));

	nStart = GetTimeMillis();
	do {
	try {
	UnloadBlockIndex();
	delete pcoinsTip;
	delete pcoinsdbview;
	delete pcoinscatcher;
	delete pblocktree;

	pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
	pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex \|\| fReindexChainState);
	pcoinscatcher = new CCoinsViewErrorCatcher(pcoinsdbview);
	pcoinsTip = new CCoinsViewCache(pcoinscatcher);

	if (fReindex) {
	pblocktree->WriteReindexing(true);
	//If we're reindexing in prune mode, wipe away unusable block files and all undo data files
	if (fPruneMode)
	CleanupBlockRevFiles();
	}

	if (!LoadBlockIndex()) {
	strLoadError = _("Error loading block database");
	break;
	}

	// If the loaded chain has a wrong genesis, bail out immediately
	// (we're likely using a testnet datadir, or the other way around).
	if (!mapBlockIndex.empty() && mapBlockIndex.count(chainparams.GetConsensus().hashGenesisBlock) == 0)
	return InitError(_("Incorrect or no genesis block found. Wrong datadir for network?"));

	// Initialize the block index (no-op if non-empty database was already loaded)
	if (!InitBlockIndex(chainparams)) {
	strLoadError = _("Error initializing block database");
	break;
	}

	// Check for changed -txindex state
	if (fTxIndex != GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
	strLoadError = _("You need to rebuild the database using -reindex-chainstate to change -txindex");
	break;
	}

	// Check for changed -prune state. What we are concerned about is a user who has pruned blocks
	// in the past, but is now trying to run unpruned.
	if (fHavePruned && !fPruneMode) {
	strLoadError = _("You need to rebuild the database using -reindex to go back to unpruned mode. This will redownload the entire blockchain");
	break;
	}

	if (!fReindex && chainActive.Tip() != NULL) {
	uiInterface.InitMessage(_("Rewinding blocks..."));
	if (!RewindBlockIndex(chainparams)) {
	strLoadError = _("Unable to rewind the database to a pre-fork state. You will need to redownload the blockchain");
	break;
	}
	}

	uiInterface.InitMessage(_("Verifying blocks..."));
	if (fHavePruned && GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) > MIN_BLOCKS_TO_KEEP) {
	LogPrintf("Prune: pruned datadir may not have more than %d blocks; only checking available blocks",
	MIN_BLOCKS_TO_KEEP);
	}

	{
	LOCK(cs_main);
	CBlockIndex* tip = chainActive.Tip();
	RPCNotifyBlockChange(true, tip);
	if (tip && tip->nTime > GetAdjustedTime() + 2 * 60 * 60) {
	strLoadError = _("The block database contains a block which appears to be from the future. "
	"This may be due to your computer's date and time being set incorrectly. "
	"Only rebuild the block database if you are sure that your computer's date and time are correct");
	break;
	}
	}

	if (!CVerifyDB().VerifyDB(chainparams, pcoinsdbview, GetArg("-checklevel", DEFAULT_CHECKLEVEL),
	GetArg("-checkblocks", DEFAULT_CHECKBLOCKS))) {
	strLoadError = _("Corrupted block database detected");
	break;
	}
	} catch (const std::exception& e) {
	if (fDebug) LogPrintf("%s\n", e.what());
	strLoadError = _("Error opening block database");
	break;
	}

	fLoaded = true;
	} while(false);

	if (!fLoaded) {
	// first suggest a reindex
	if (!fReset) {
	bool fRet = uiInterface.ThreadSafeQuestion(
	strLoadError + ".\n\n" + _("Do you want to rebuild the block database now?"),
	strLoadError + ".\nPlease restart with -reindex or -reindex-chainstate to recover.",
	"", CClientUIInterface::MSG_ERROR \| CClientUIInterface::BTN_ABORT);
	if (fRet) {
	fReindex = true;
	fRequestShutdown = false;
	} else {
	LogPrintf("Aborted block database rebuild. Exiting.\n");
	return false;
	}
	} else {
	return InitError(strLoadError);
	}
	}
	}

	// As LoadBlockIndex can take several minutes, it's possible the user
	// requested to kill the GUI during the last operation. If so, exit.
	// As the program has not fully started yet, Shutdown() is possibly overkill.
	if (fRequestShutdown)
	{
	LogPrintf("Shutdown requested. Exiting.\n");
	return false;
	}
	LogPrintf(" block index %15dms\n", GetTimeMillis() - nStart);

	boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
	CAutoFile est_filein(fopen(est_path.string().c_str(), "rb"), SER_DISK, CLIENT_VERSION);
	// Allowed to fail as this file IS missing on first startup.
	if (!est_filein.IsNull())
	mempool.ReadFeeEstimates(est_filein);
	fFeeEstimatesInitialized = true;

	// ********************************************************* Step 8: load wallet
	#ifdef ENABLE_WALLET
	if (!CWallet::InitLoadWallet())
	return false;
	#else
	LogPrintf("No wallet support compiled in!\n");
	#endif

	// ********************************************************* Step 9: data directory maintenance

	// if pruning, unset the service bit and perform the initial blockstore prune
	// after any wallet rescanning has taken place.
	if (fPruneMode) {
	LogPrintf("Unsetting NODE_NETWORK on prune mode\n");
	nLocalServices = ServiceFlags(nLocalServices & ~NODE_NETWORK);
	if (!fReindex) {
	uiInterface.InitMessage(_("Pruning blockstore..."));
	PruneAndFlush();
	}
	}

	if (Params().GetConsensus().vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0) {
	// Only advertize witness capabilities if they have a reasonable start time.
	// This allows us to have the code merged without a defined softfork, by setting its
	// end time to 0.
	// Note that setting NODE_WITNESS is never required: the only downside from not
	// doing so is that after activation, no upgraded nodes will fetch from you.
	nLocalServices = ServiceFlags(nLocalServices \| NODE_WITNESS);
	// Only care about others providing witness capabilities if there is a softfork
	// defined.
	nRelevantServices = ServiceFlags(nRelevantServices \| NODE_WITNESS);
	}

	// ********************************************************* Step 10: import blocks

	if (!CheckDiskSpace())
	return false;

	// Either install a handler to notify us when genesis activates, or set fHaveGenesis directly.
	// No locking, as this happens before any background thread is started.
	if (chainActive.Tip() == NULL) {
	uiInterface.NotifyBlockTip.connect(BlockNotifyGenesisWait);
	} else {
	fHaveGenesis = true;
	}

	if (mapArgs.count("-blocknotify"))
	uiInterface.NotifyBlockTip.connect(BlockNotifyCallback);

	std::vector<boost::filesystem::path> vImportFiles;
	if (mapArgs.count("-loadblock"))
	{
	BOOST_FOREACH(const std::string& strFile, mapMultiArgs["-loadblock"])
	vImportFiles.push_back(strFile);
	}

	threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));

	// Wait for genesis block to be processed
	{
	boost::unique_lock<boost::mutex> lock(cs_GenesisWait);
	while (!fHaveGenesis) {
	condvar_GenesisWait.wait(lock);
	}
	uiInterface.NotifyBlockTip.disconnect(BlockNotifyGenesisWait);
	}

	// ********************************************************* Step 11: start node

	//// debug print
	LogPrintf("mapBlockIndex.size() = %u\n", mapBlockIndex.size());
	LogPrintf("nBestHeight = %d\n", chainActive.Height());
	if (GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
	StartTorControl(threadGroup, scheduler);

	Discover(threadGroup);

	// Map ports with UPnP
	MapPort(GetBoolArg("-upnp", DEFAULT_UPNP));

	std::string strNodeError;
	CConnman::Options connOptions;
	connOptions.nLocalServices = nLocalServices;
	connOptions.nRelevantServices = nRelevantServices;
	connOptions.nMaxConnections = nMaxConnections;
	connOptions.nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, connOptions.nMaxConnections);
	connOptions.nMaxFeeler = 1;
	connOptions.nBestHeight = chainActive.Height();
	connOptions.uiInterface = &uiInterface;
	connOptions.nSendBufferMaxSize = 1000*GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER);
	connOptions.nReceiveFloodSize = 1000*GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER);

	connOptions.nMaxOutboundTimeframe = nMaxOutboundTimeframe;
	connOptions.nMaxOutboundLimit = nMaxOutboundLimit;

	if(!connman.Start(threadGroup, scheduler, strNodeError, connOptions))
	return InitError(strNodeError);

	// ********************************************************* Step 12: finished

	SetRPCWarmupFinished();
	uiInterface.InitMessage(_("Done loading"));

	#ifdef ENABLE_WALLET
	if (pwalletMain) {
	// Run a thread to flush wallet periodically
	threadGroup.create_thread(boost::bind(&ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));
	}
	#endif

	return !fRequestShutdown;
	}

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