192 lines
7.6 KiB
Python
Executable File
192 lines
7.6 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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'''
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assumevalid.py
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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.mininode import *
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import *
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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.script import *
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class BaseNode(SingleNodeConnCB):
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def __init__(self):
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SingleNodeConnCB.__init__(self)
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self.last_inv = None
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self.last_headers = None
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self.last_block = None
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self.last_getdata = None
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self.block_announced = False
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self.last_getheaders = None
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self.disconnected = False
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self.last_blockhash_announced = None
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def on_close(self, conn):
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self.disconnected = True
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def wait_for_disconnect(self, timeout=60):
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test_function = lambda: self.disconnected
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assert(wait_until(test_function, timeout=timeout))
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return
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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 SendHeadersTest(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 = []
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self.nodes.append(start_node(0, self.options.tmpdir, ["-debug"]))
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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 2100 deep
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for i in range(2100):
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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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["-debug", "-assumevalid=" + hex(block102.sha256)]))
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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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["-debug", "-assumevalid=" + hex(block102.sha256)]))
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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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# send header lists to all three nodes
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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:])
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node2.send_header_for_blocks(self.blocks[0:200])
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# Send 102 blocks to node0. Block 102 will be rejected.
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for i in range(101):
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node0.send_message(msg_block(self.blocks[i]))
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node0.sync_with_ping() # make sure the most recent block is synced
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node0.send_message(msg_block(self.blocks[101]))
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assert_equal(self.nodes[0].getblock(self.nodes[0].getbestblockhash())['height'], 101)
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# Send 3102 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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node1.sync_with_ping() # make sure the most recent block is synced
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assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 2202)
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# Send 102 blocks to node2. Block 102 will be rejected.
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for i in range(101):
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node2.send_message(msg_block(self.blocks[i]))
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node2.sync_with_ping() # make sure the most recent block is synced
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node2.send_message(msg_block(self.blocks[101]))
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assert_equal(self.nodes[2].getblock(self.nodes[2].getbestblockhash())['height'], 101)
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if __name__ == '__main__':
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SendHeadersTest().main()
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