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feature_assumevalid.py
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#!/usr/bin/env python3
# Copyright (c) 2014-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test logic for skipping signature validation on old blocks.
Test logic for skipping signature validation on blocks which we've assumed
valid (https://github.com/bitcoin/bitcoin/pull/9484)
We build a chain that includes and invalid signature for one of the
transactions:
0: genesis block
1: block 1 with coinbase transaction output.
2-101: bury that block with 100 blocks so the coinbase transaction
output can be spent
102: a block containing a transaction spending the coinbase
transaction output. The transaction has an invalid signature.
103-2202: bury the bad block with just over two weeks' worth of blocks
(2100 blocks)
Start three nodes:
- node0 has no -assumevalid parameter. Try to sync to block 2202. It will
reject block 102 and only sync as far as block 101
- node1 has -assumevalid set to the hash of block 102. Try to sync to
block 2202. node1 will sync all the way to block 2202.
- node2 has -assumevalid set to the hash of block 102. Try to sync to
block 200. node2 will reject block 102 since it's assumed valid, but it
isn't buried by at least two weeks' work.
"""
from test_framework.blocktools import create_block, create_coinbase
from test_framework.key import ECKey
from test_framework.messages import (
CBlockHeader,
COutPoint,
CTransaction,
CTxIn,
CTxOut,
msg_block,
msg_headers,
)
from test_framework.p2p import P2PInterface
from test_framework.script import OP_TRUE, CScript
from test_framework.test_framework import BitcoinTestFramework
from test_framework.txtools import pad_tx
from test_framework.util import assert_equal
class BaseNode(P2PInterface):
def send_header_for_blocks(self, new_blocks):
headers_message = msg_headers()
headers_message.headers = [CBlockHeader(b) for b in new_blocks]
self.send_message(headers_message)
class AssumeValidTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 3
# Need a bit of extra time when running with the thread sanitizer
self.rpc_timeout = 120
def setup_network(self):
self.add_nodes(3)
# Start node0. We don't start the other nodes yet since
# we need to pre-mine a block with an invalid transaction
# signature so we can pass in the block hash as assumevalid.
self.start_node(0)
def send_blocks_until_disconnected(self, p2p_conn):
"""Keep sending blocks to the node until we're disconnected."""
for i in range(len(self.blocks)):
if not p2p_conn.is_connected:
break
try:
p2p_conn.send_message(msg_block(self.blocks[i]))
except IOError:
assert not p2p_conn.is_connected
break
def run_test(self):
p2p0 = self.nodes[0].add_p2p_connection(BaseNode())
# Build the blockchain
self.tip = int(self.nodes[0].getbestblockhash(), 16)
self.block_time = (
self.nodes[0].getblock(self.nodes[0].getbestblockhash())["time"] + 1
)
self.blocks = []
# Get a pubkey for the coinbase TXO
coinbase_key = ECKey()
coinbase_key.generate()
coinbase_pubkey = coinbase_key.get_pubkey().get_bytes()
# Create the first block with a coinbase output to our key
height = 1
block = create_block(
self.tip, create_coinbase(height, coinbase_pubkey), self.block_time
)
self.blocks.append(block)
self.block_time += 1
block.solve()
# Save the coinbase for later
self.block1 = block
self.tip = block.sha256
height += 1
# Bury the block 100 deep so the coinbase output is spendable
for _ in range(100):
block = create_block(self.tip, create_coinbase(height), self.block_time)
block.solve()
self.blocks.append(block)
self.tip = block.sha256
self.block_time += 1
height += 1
# Create a transaction spending the coinbase output with an invalid
# (null) signature
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.block1.vtx[0].sha256, 0), scriptSig=b""))
tx.vout.append(CTxOut(49 * 100000000, CScript([OP_TRUE])))
pad_tx(tx)
tx.calc_sha256()
block102 = create_block(self.tip, create_coinbase(height), self.block_time)
self.block_time += 1
block102.vtx.extend([tx])
block102.hashMerkleRoot = block102.calc_merkle_root()
block102.rehash()
block102.solve()
self.blocks.append(block102)
self.tip = block102.sha256
self.block_time += 1
height += 1
# Bury the assumed valid block 2100 deep
for _ in range(2100):
block = create_block(self.tip, create_coinbase(height), self.block_time)
block.nVersion = 4
block.solve()
self.blocks.append(block)
self.tip = block.sha256
self.block_time += 1
height += 1
self.nodes[0].disconnect_p2ps()
# Start node1 and node2 with assumevalid so they accept a block with a
# bad signature.
self.start_node(1, extra_args=[f"-assumevalid={hex(block102.sha256)}"])
self.start_node(2, extra_args=[f"-assumevalid={hex(block102.sha256)}"])
p2p0 = self.nodes[0].add_p2p_connection(BaseNode())
p2p1 = self.nodes[1].add_p2p_connection(BaseNode())
p2p2 = self.nodes[2].add_p2p_connection(BaseNode())
# send header lists to all three nodes
p2p0.send_header_for_blocks(self.blocks[0:2000])
p2p0.send_header_for_blocks(self.blocks[2000:])
p2p1.send_header_for_blocks(self.blocks[0:2000])
p2p1.send_header_for_blocks(self.blocks[2000:])
p2p2.send_header_for_blocks(self.blocks[0:200])
# Send blocks to node0. Block 102 will be rejected.
self.send_blocks_until_disconnected(p2p0)
self.wait_until(lambda: self.nodes[0].getblockcount() >= 101)
assert_equal(self.nodes[0].getblockcount(), 101)
# Send all blocks to node1. All blocks will be accepted.
for i in range(2202):
p2p1.send_message(msg_block(self.blocks[i]))
# Syncing 2200 blocks can take a while on slow systems. Give it plenty
# of time to sync.
p2p1.sync_with_ping(960)
assert_equal(
self.nodes[1].getblock(self.nodes[1].getbestblockhash())["height"], 2202
)
# Send blocks to node2. Block 102 will be rejected.
self.send_blocks_until_disconnected(p2p2)
self.wait_until(lambda: self.nodes[2].getblockcount() >= 101)
assert_equal(self.nodes[2].getblockcount(), 101)
if __name__ == "__main__":
AssumeValidTest().main()

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