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Diffstat (limited to 'test/functional/assumevalid.py')
| -rwxr-xr-x | test/functional/assumevalid.py | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/test/functional/assumevalid.py b/test/functional/assumevalid.py new file mode 100755 index 0000000000..8e301c4379 --- /dev/null +++ b/test/functional/assumevalid.py @@ -0,0 +1,202 @@ +#!/usr/bin/env python3 +# Copyright (c) 2014-2016 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. +""" +import time + +from test_framework.blocktools import (create_block, create_coinbase) +from test_framework.key import CECKey +from test_framework.mininode import (CBlockHeader, + COutPoint, + CTransaction, + CTxIn, + CTxOut, + NetworkThread, + NodeConn, + NodeConnCB, + msg_block, + msg_headers) +from test_framework.script import (CScript, OP_TRUE) +from test_framework.test_framework import BitcoinTestFramework +from test_framework.util import (start_node, p2p_port, assert_equal) + +class BaseNode(NodeConnCB): + 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 __init__(self): + super().__init__() + self.setup_clean_chain = True + self.num_nodes = 3 + + def setup_network(self): + # 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.nodes = [start_node(0, self.options.tmpdir)] + + def send_blocks_until_disconnected(self, node): + """Keep sending blocks to the node until we're disconnected.""" + for i in range(len(self.blocks)): + try: + node.send_message(msg_block(self.blocks[i])) + except IOError as e: + assert str(e) == 'Not connected, no pushbuf' + break + + def assert_blockchain_height(self, node, height): + """Wait until the blockchain is no longer advancing and verify it's reached the expected height.""" + last_height = node.getblock(node.getbestblockhash())['height'] + timeout = 10 + while True: + time.sleep(0.25) + current_height = node.getblock(node.getbestblockhash())['height'] + if current_height != last_height: + last_height = current_height + if timeout < 0: + assert False, "blockchain too short after timeout: %d" % current_height + timeout - 0.25 + continue + elif current_height > height: + assert False, "blockchain too long: %d" % current_height + elif current_height == height: + break + + def run_test(self): + + # Connect to node0 + node0 = BaseNode() + connections = [] + connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0)) + node0.add_connection(connections[0]) + + NetworkThread().start() # Start up network handling in another thread + node0.wait_for_verack() + + # 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 = CECKey() + coinbase_key.set_secretbytes(b"horsebattery") + coinbase_pubkey = coinbase_key.get_pubkey() + + # 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 i 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]))) + 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 i 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 + + # Start node1 and node2 with assumevalid so they accept a block with a bad signature. + self.nodes.append(start_node(1, self.options.tmpdir, + ["-assumevalid=" + hex(block102.sha256)])) + node1 = BaseNode() # connects to node1 + connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], node1)) + node1.add_connection(connections[1]) + node1.wait_for_verack() + + self.nodes.append(start_node(2, self.options.tmpdir, + ["-assumevalid=" + hex(block102.sha256)])) + node2 = BaseNode() # connects to node2 + connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2)) + node2.add_connection(connections[2]) + node2.wait_for_verack() + + # send header lists to all three nodes + node0.send_header_for_blocks(self.blocks[0:2000]) + node0.send_header_for_blocks(self.blocks[2000:]) + node1.send_header_for_blocks(self.blocks[0:2000]) + node1.send_header_for_blocks(self.blocks[2000:]) + node2.send_header_for_blocks(self.blocks[0:200]) + + # Send blocks to node0. Block 102 will be rejected. + self.send_blocks_until_disconnected(node0) + self.assert_blockchain_height(self.nodes[0], 101) + + # Send all blocks to node1. All blocks will be accepted. + for i in range(2202): + node1.send_message(msg_block(self.blocks[i])) + # Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync. + node1.sync_with_ping(120) + 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(node2) + self.assert_blockchain_height(self.nodes[2], 101) + +if __name__ == '__main__': + AssumeValidTest().main() |