#!/usr/bin/env python3 # Copyright (c) 2015-2016 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 node responses to invalid transactions. In this test we connect to one node over p2p, and test tx requests.""" from test_framework.blocktools import create_block, create_coinbase, create_transaction from test_framework.mininode import ( COIN, COutPoint, CTransaction, CTxIn, CTxOut, ) from test_framework.mininode import network_thread_start, P2PDataStore, network_thread_join from test_framework.test_framework import BitcoinTestFramework from test_framework.util import ( assert_equal, wait_until, ) class InvalidTxRequestTest(BitcoinTestFramework): def set_test_params(self): self.num_nodes = 1 self.setup_clean_chain = True def bootstrap_p2p(self, *, num_connections=1): """Add a P2P connection to the node. Helper to connect and wait for version handshake.""" for _ in range(num_connections): self.nodes[0].add_p2p_connection(P2PDataStore()) network_thread_start() self.nodes[0].p2p.wait_for_verack() def reconnect_p2p(self, **kwargs): """Tear down and bootstrap the P2P connection to the node. The node gets disconnected several times in this test. This helper method reconnects the p2p and restarts the network thread.""" self.nodes[0].disconnect_p2ps() network_thread_join() self.bootstrap_p2p(**kwargs) def run_test(self): node = self.nodes[0] # convenience reference to the node self.bootstrap_p2p() # Add one p2p connection to the node best_block = self.nodes[0].getbestblockhash() tip = int(best_block, 16) best_block_time = self.nodes[0].getblock(best_block)['time'] block_time = best_block_time + 1 self.log.info("Create a new block with an anyone-can-spend coinbase.") height = 1 block = create_block(tip, create_coinbase(height), block_time) block.solve() # Save the coinbase for later block1 = block tip = block.sha256 # Create a second one to test orphan resolution via block receival height += 1 block_time += 1 block = create_block(tip, create_coinbase(height), block_time) block.solve() # Save the coinbase for later block2 = block tip = block.sha256 node.p2p.send_blocks_and_test([block1, block2], node, success=True) self.log.info("Mature the block.") self.nodes[0].generate(100) # b'\x64' is OP_NOTIF # Transaction will be rejected with code 16 (REJECT_INVALID) # and we get disconnected immediately self.log.info('Test a transaction that is rejected') tx1 = create_transaction(block1.vtx[0], 0, b'\x64', 50 * COIN) node.p2p.send_txs_and_test([tx1], node, success=False, expect_disconnect=True) # Make two p2p connections to provide the node with orphans # * p2ps[0] will send valid orphan txs (one with low fee) # * p2ps[1] will send an invalid orphan tx (and is later disconnected for that) self.reconnect_p2p(num_connections=2) self.log.info('Test orphan transaction handling ... ') self.test_orphan_tx_handling(block1.vtx[0].sha256, False) node.generate(1) # Clear mempool self.reconnect_p2p(num_connections=2) self.test_orphan_tx_handling(block2.vtx[0].sha256, True) def test_orphan_tx_handling(self, base_tx, resolve_via_block): node = self.nodes[0] # convenience reference to the node # Create a root transaction that we withold until all dependend transactions # are sent out and in the orphan cache tx_withhold = CTransaction() tx_withhold.vin.append(CTxIn(outpoint=COutPoint(base_tx, 0))) tx_withhold.vout.append(CTxOut(nValue=50 * COIN - 12000, scriptPubKey=b'\x51')) tx_withhold.calc_sha256() # Our first orphan tx with some outputs to create further orphan txs tx_orphan_1 = CTransaction() tx_orphan_1.vin.append(CTxIn(outpoint=COutPoint(tx_withhold.sha256, 0))) tx_orphan_1.vout = [CTxOut(nValue=10 * COIN, scriptPubKey=b'\x51')] * 3 tx_orphan_1.calc_sha256() # A valid transaction with low fee tx_orphan_2_no_fee = CTransaction() tx_orphan_2_no_fee.vin.append(CTxIn(outpoint=COutPoint(tx_orphan_1.sha256, 0))) tx_orphan_2_no_fee.vout.append(CTxOut(nValue=10 * COIN, scriptPubKey=b'\x51')) # A valid transaction with sufficient fee tx_orphan_2_valid = CTransaction() tx_orphan_2_valid.vin.append(CTxIn(outpoint=COutPoint(tx_orphan_1.sha256, 1))) tx_orphan_2_valid.vout.append(CTxOut(nValue=10 * COIN - 12000, scriptPubKey=b'\x51')) tx_orphan_2_valid.calc_sha256() # An invalid transaction with negative fee tx_orphan_2_invalid = CTransaction() tx_orphan_2_invalid.vin.append(CTxIn(outpoint=COutPoint(tx_orphan_1.sha256, 2))) tx_orphan_2_invalid.vout.append(CTxOut(nValue=11 * COIN, scriptPubKey=b'\x51')) self.log.info('Send the orphans ... ') # Send valid orphan txs from p2ps[0] node.p2p.send_txs_and_test([tx_orphan_1, tx_orphan_2_no_fee, tx_orphan_2_valid], node, success=False) # Send invalid tx from p2ps[1] node.p2ps[1].send_txs_and_test([tx_orphan_2_invalid], node, success=False) assert_equal(0, node.getmempoolinfo()['size']) # Mempool should be empty assert_equal(2, len(node.getpeerinfo())) # p2ps[1] is still connected self.log.info('Send the withhold tx ... ') if resolve_via_block: # Test orphan handling/resolution by publishing the withhold TX via a mined block prev_block = node.getblockheader(node.getbestblockhash()) block = create_block(int(prev_block['hash'], 16), create_coinbase(prev_block['height'] + 1), prev_block["time"] + 1) block.vtx.append(tx_withhold) block.hashMerkleRoot = block.calc_merkle_root() block.solve() node.p2p.send_blocks_and_test([block], node, success=True) else: # Test orphan handling/resolution by publishing the withhold TX via the mempool node.p2p.send_txs_and_test([tx_withhold], node, success=True) # Transactions that should end up in the mempool expected_mempool = { t.hash for t in [ tx_withhold, # The transaction that is the root for all orphans tx_orphan_1, # The orphan transaction that splits the coins tx_orphan_2_valid, # The valid transaction (with sufficient fee) ] } # Transactions that do not end up in the mempool # tx_orphan_no_fee, because it has too low fee (p2ps[0] is not disconnected for relaying that tx) # tx_orphan_invaid, because it has negative fee (p2ps[1] is disconnected for relaying that tx) if resolve_via_block: # This TX has appeared in a block instead of being broadcasted via the mempool expected_mempool.remove(tx_withhold.hash) wait_until(lambda: 1 == len(node.getpeerinfo()), timeout=12) # p2ps[1] is no longer connected assert_equal(expected_mempool, set(node.getrawmempool())) if __name__ == '__main__': InvalidTxRequestTest().main()