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c2ac477a11
Dash has only 1/4 of block time compared to Bitcoin, which requires 4 times the amount of headers so that the assumevalid check in ConnectBlock results in skipping of script checks. Using so many headers now causes block time validation to fail (too far in the future), so we need to adjust mock time as well.
214 lines
9.1 KiB
Python
Executable File
214 lines
9.1 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 (start_node, 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 = [start_node(0, self.options.tmpdir, ["-dip3params=9000:9000"])]
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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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try:
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node.send_message(msg_block(self.blocks[i]))
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except IOError as e:
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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(start_node(1, self.options.tmpdir,
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["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000"]))
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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(start_node(2, self.options.tmpdir,
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["-assumevalid=" + hex(block102.sha256), "-dip3params=9000:9000"]))
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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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set_mocktime(self.block_time)
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set_node_times(self.nodes, get_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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node0.send_header_for_blocks(self.blocks[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 all blocks to node1. All blocks will be accepted.
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for i in range(2202):
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node1.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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node1.sync_with_ping(120)
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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(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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