Browse Source
0.147b5e3feAdd assumevalid testcase (John Newbery)e440ac7Introduce assumevalid setting to skip presumed valid scripts. (Gregory Maxwell)
Pieter Wuille
8 years ago
8 changed files with 266 additions and 12 deletions
@ -0,0 +1,191 @@
@@ -0,0 +1,191 @@
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#!/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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