218 lines
9.4 KiB
Python
Executable File
218 lines
9.4 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2014-2016 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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import time
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from test_framework.blocktools import (create_block, create_coinbase)
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from test_framework.key import CECKey
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from test_framework.mininode import (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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NetworkThread,
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NodeConn,
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NodeConnCB,
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msg_block,
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msg_headers)
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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 (p2p_port, assert_equal, get_mocktime, set_mocktime, set_node_times)
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class BaseNode(NodeConnCB):
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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 __init__(self):
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super().__init__()
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self.setup_clean_chain = True
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self.num_nodes = 3
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def setup_network(self):
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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.nodes = [self.start_node(0, self.options.tmpdir, ["-dip3params=9000:9000", "-checkblockindex=0"])]
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def send_blocks_until_disconnected(self, node):
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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 node.connection:
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break
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try:
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node.send_message(msg_block(self.blocks[i]))
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# TODO There is a race condition between send_message and on_close which causes an AttributError on Travis
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# We can reenable the correct exception handling and the assert when Bitcoin 0.16 mininode.py changes have been
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# backported
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#except IOError as e:
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except:
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#assert str(e) == 'Not connected, no pushbuf'
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break
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def assert_blockchain_height(self, node, height):
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"""Wait until the blockchain is no longer advancing and verify it's reached the expected height."""
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last_height = node.getblock(node.getbestblockhash())['height']
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timeout = 10
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while True:
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time.sleep(0.25)
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current_height = node.getblock(node.getbestblockhash())['height']
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if current_height != last_height:
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last_height = current_height
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if timeout < 0:
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assert False, "blockchain too short after timeout: %d" % current_height
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timeout - 0.25
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continue
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elif current_height > height:
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assert False, "blockchain too long: %d" % current_height
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elif current_height == height:
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break
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def run_test(self):
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# Connect to node0
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node0 = BaseNode()
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connections = []
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0))
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node0.add_connection(connections[0])
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NetworkThread().start() # Start up network handling in another thread
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node0.wait_for_verack()
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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 = CECKey()
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coinbase_key.set_secretbytes(b"horsebattery")
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coinbase_pubkey = coinbase_key.get_pubkey()
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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 i 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)
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self.block_time += 1
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block102.vtx.extend([tx])
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block102.hashMerkleRoot = block102.calc_merkle_root()
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block102.rehash()
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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 8400 deep (Dash needs 4x as much blocks to allow -assumevalid to work)
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for i in range(8400):
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block = create_block(self.tip, create_coinbase(height), self.block_time)
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block.nVersion = 4
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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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# Start node1 and node2 with assumevalid so they accept a block with a bad signature.
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self.nodes.append(self.start_node(1, self.options.tmpdir,
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["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000", "-checkblockindex=0"]))
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node1 = BaseNode() # connects to node1
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connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], node1))
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node1.add_connection(connections[1])
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node1.wait_for_verack()
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self.nodes.append(self.start_node(2, self.options.tmpdir,
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["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000", "-checkblockindex=0"]))
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node2 = BaseNode() # connects to node2
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connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2))
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node2.add_connection(connections[2])
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node2.wait_for_verack()
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# Make sure nodes actually accept the many headers
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self.set_mocktime(self.block_time)
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set_node_times(self.nodes, self.mocktime)
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# send header lists to all three nodes.
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# node0 does not need to receive all headers
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# node1 must receive all headers as otherwise assumevalid is ignored in ConnectBlock
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# node2 should NOT receive all headers to force skipping of the assumevalid check in ConnectBlock
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node0.send_header_for_blocks(self.blocks[0:2000])
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node1.send_header_for_blocks(self.blocks[0:2000])
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node1.send_header_for_blocks(self.blocks[2000:4000])
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node1.send_header_for_blocks(self.blocks[4000:6000])
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node1.send_header_for_blocks(self.blocks[6000:8000])
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node1.send_header_for_blocks(self.blocks[8000:])
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node2.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(node0)
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self.assert_blockchain_height(self.nodes[0], 101)
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# Send 200 blocks to node1. All blocks, including block 102, will be accepted.
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for i in range(200):
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node1.send_message(msg_block(self.blocks[i]))
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# Syncing so many blocks can take a while on slow systems. Give it plenty of time to sync.
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node1.sync_with_ping(300)
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assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 200)
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# Send blocks to node2. Block 102 will be rejected.
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self.send_blocks_until_disconnected(node2)
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self.assert_blockchain_height(self.nodes[2], 101)
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if __name__ == '__main__':
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AssumeValidTest().main()
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