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179 lines
6.8 KiB
179 lines
6.8 KiB
#!/usr/bin/env python3
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# Copyright (c) 2014-2021 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test logic for skipping signature validation on old blocks.
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Test logic for skipping signature validation on blocks which we've assumed
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valid (https://github.com/bitcoin/bitcoin/pull/9484)
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We build a chain that includes and invalid signature for one of the
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transactions:
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0: genesis block
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1: block 1 with coinbase transaction output.
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2-101: bury that block with 100 blocks so the coinbase transaction
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output can be spent
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102: a block containing a transaction spending the coinbase
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transaction output. The transaction has an invalid signature.
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103-2202: bury the bad block with just over two weeks' worth of blocks
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(2100 blocks)
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Start three nodes:
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- node0 has no -assumevalid parameter. Try to sync to block 2202. It will
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reject block 102 and only sync as far as block 101
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- node1 has -assumevalid set to the hash of block 102. Try to sync to
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block 2202. node1 will sync all the way to block 2202.
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- node2 has -assumevalid set to the hash of block 102. Try to sync to
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block 200. node2 will reject block 102 since it's assumed valid, but it
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isn't buried by at least two weeks' work.
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"""
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from test_framework.blocktools import (
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COINBASE_MATURITY,
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create_block,
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create_coinbase,
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)
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from test_framework.key import ECKey
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from test_framework.messages import (
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CBlockHeader,
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COutPoint,
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CTransaction,
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CTxIn,
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CTxOut,
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msg_block,
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msg_headers,
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)
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from test_framework.p2p import P2PInterface
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from test_framework.script import (CScript, OP_TRUE)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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class BaseNode(P2PInterface):
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def send_header_for_blocks(self, new_blocks):
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headers_message = msg_headers()
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headers_message.headers = [CBlockHeader(b) for b in new_blocks]
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self.send_message(headers_message)
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class AssumeValidTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 3
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self.rpc_timeout = 120
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def setup_network(self):
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self.add_nodes(3)
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# Start node0. We don't start the other nodes yet since
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# we need to pre-mine a block with an invalid transaction
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# signature so we can pass in the block hash as assumevalid.
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self.start_node(0)
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def send_blocks_until_disconnected(self, p2p_conn):
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"""Keep sending blocks to the node until we're disconnected."""
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for i in range(len(self.blocks)):
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if not p2p_conn.is_connected:
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break
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try:
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p2p_conn.send_message(msg_block(self.blocks[i]))
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except IOError:
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assert not p2p_conn.is_connected
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break
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def run_test(self):
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p2p0 = self.nodes[0].add_p2p_connection(BaseNode())
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# Build the blockchain
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self.tip = int(self.nodes[0].getbestblockhash(), 16)
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self.block_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] + 1
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self.blocks = []
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# Get a pubkey for the coinbase TXO
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coinbase_key = ECKey()
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coinbase_key.generate()
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coinbase_pubkey = coinbase_key.get_pubkey().get_bytes()
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# Create the first block with a coinbase output to our key
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height = 1
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block = create_block(self.tip, create_coinbase(height, coinbase_pubkey), self.block_time)
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self.blocks.append(block)
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self.block_time += 1
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block.solve()
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# Save the coinbase for later
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self.block1 = block
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self.tip = block.sha256
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height += 1
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# Bury the block 100 deep so the coinbase output is spendable
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for _ in range(100):
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block = create_block(self.tip, create_coinbase(height), self.block_time)
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block.solve()
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self.blocks.append(block)
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self.tip = block.sha256
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self.block_time += 1
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height += 1
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# Create a transaction spending the coinbase output with an invalid (null) signature
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tx = CTransaction()
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tx.vin.append(CTxIn(COutPoint(self.block1.vtx[0].sha256, 0), scriptSig=b""))
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tx.vout.append(CTxOut(49 * 100000000, CScript([OP_TRUE])))
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tx.calc_sha256()
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block102 = create_block(self.tip, create_coinbase(height), self.block_time, txlist=[tx])
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self.block_time += 1
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block102.solve()
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self.blocks.append(block102)
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self.tip = block102.sha256
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self.block_time += 1
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height += 1
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# Bury the assumed valid block 2100 deep
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for _ in range(2100):
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block = create_block(self.tip, create_coinbase(height), self.block_time)
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block.solve()
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self.blocks.append(block)
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self.tip = block.sha256
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self.block_time += 1
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height += 1
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self.nodes[0].disconnect_p2ps()
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# Start node1 and node2 with assumevalid so they accept a block with a bad signature.
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self.start_node(1, extra_args=["-assumevalid=" + hex(block102.sha256)])
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self.start_node(2, extra_args=["-assumevalid=" + hex(block102.sha256)])
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p2p0 = self.nodes[0].add_p2p_connection(BaseNode())
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p2p1 = self.nodes[1].add_p2p_connection(BaseNode())
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p2p2 = self.nodes[2].add_p2p_connection(BaseNode())
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# send header lists to all three nodes
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p2p0.send_header_for_blocks(self.blocks[0:2000])
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p2p0.send_header_for_blocks(self.blocks[2000:])
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p2p1.send_header_for_blocks(self.blocks[0:2000])
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p2p1.send_header_for_blocks(self.blocks[2000:])
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p2p2.send_header_for_blocks(self.blocks[0:200])
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# Send blocks to node0. Block 102 will be rejected.
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self.send_blocks_until_disconnected(p2p0)
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self.wait_until(lambda: self.nodes[0].getblockcount() >= COINBASE_MATURITY + 1)
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assert_equal(self.nodes[0].getblockcount(), COINBASE_MATURITY + 1)
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# Send all blocks to node1. All blocks will be accepted.
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for i in range(2202):
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p2p1.send_message(msg_block(self.blocks[i]))
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# Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync.
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p2p1.sync_with_ping(960)
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assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 2202)
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# Send blocks to node2. Block 102 will be rejected.
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self.send_blocks_until_disconnected(p2p2)
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self.wait_until(lambda: self.nodes[2].getblockcount() >= COINBASE_MATURITY + 1)
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assert_equal(self.nodes[2].getblockcount(), COINBASE_MATURITY + 1)
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if __name__ == '__main__':
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AssumeValidTest().main()
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