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215 lines
8.8 KiB
215 lines
8.8 KiB
#!/usr/bin/env python3
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# Copyright (c) 2015-2020 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 BIP65 (CHECKLOCKTIMEVERIFY).
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Test that the CHECKLOCKTIMEVERIFY soft-fork activates at (regtest) block height
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1351.
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"""
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from test_framework.blocktools import (
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create_block,
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create_coinbase,
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create_transaction,
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)
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from test_framework.messages import (
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CTransaction,
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ToHex,
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msg_block,
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)
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from test_framework.p2p import P2PInterface
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from test_framework.script import (
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CScript,
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CScriptNum,
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OP_1NEGATE,
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OP_CHECKLOCKTIMEVERIFY,
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OP_DROP,
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)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_equal,
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hex_str_to_bytes,
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)
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from io import BytesIO
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CLTV_HEIGHT = 1351
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# Helper function to modify a transaction by
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# 1) prepending a given script to the scriptSig of vin 0 and
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# 2) (optionally) modify the nSequence of vin 0 and the tx's nLockTime
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def cltv_modify_tx(node, tx, prepend_scriptsig, nsequence=None, nlocktime=None):
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if nsequence is not None:
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tx.vin[0].nSequence = nsequence
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tx.nLockTime = nlocktime
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# Need to re-sign, since nSequence and nLockTime changed
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signed_result = node.signrawtransactionwithwallet(ToHex(tx))
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new_tx = CTransaction()
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new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
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else:
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new_tx = tx
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new_tx.vin[0].scriptSig = CScript(prepend_scriptsig + list(CScript(new_tx.vin[0].scriptSig)))
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return new_tx
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def cltv_invalidate(node, tx, failure_reason):
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# Modify the signature in vin 0 and nSequence/nLockTime of the tx to fail CLTV
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#
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# According to BIP65, OP_CHECKLOCKTIMEVERIFY can fail due the following reasons:
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# 1) the stack is empty
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# 2) the top item on the stack is less than 0
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# 3) the lock-time type (height vs. timestamp) of the top stack item and the
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# nLockTime field are not the same
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# 4) the top stack item is greater than the transaction's nLockTime field
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# 5) the nSequence field of the txin is 0xffffffff
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assert failure_reason in range(5)
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scheme = [
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# | Script to prepend to scriptSig | nSequence | nLockTime |
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# +-------------------------------------------------+------------+--------------+
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[[OP_CHECKLOCKTIMEVERIFY], None, None],
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[[OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP], None, None],
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[[CScriptNum(1000), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, 1296688602], # timestamp of genesis block
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[[CScriptNum(1000), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, 500],
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[[CScriptNum(500), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0xffffffff, 500],
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][failure_reason]
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return cltv_modify_tx(node, tx, prepend_scriptsig=scheme[0], nsequence=scheme[1], nlocktime=scheme[2])
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def cltv_validate(node, tx, height):
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# Modify the signature in vin 0 and nSequence/nLockTime of the tx to pass CLTV
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scheme = [[CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, height]
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return cltv_modify_tx(node, tx, prepend_scriptsig=scheme[0], nsequence=scheme[1], nlocktime=scheme[2])
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class BIP65Test(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.extra_args = [[
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'-whitelist=noban@127.0.0.1',
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'-par=1', # Use only one script thread to get the exact reject reason for testing
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'-acceptnonstdtxn=1', # cltv_invalidate is nonstandard
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]]
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self.setup_clean_chain = True
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self.rpc_timeout = 480
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def test_cltv_info(self, *, is_active):
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assert_equal(self.nodes[0].getblockchaininfo()['softforks']['bip65'], {
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"active": is_active,
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"height": CLTV_HEIGHT,
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"type": "buried",
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},
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)
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def run_test(self):
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peer = self.nodes[0].add_p2p_connection(P2PInterface())
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self.test_cltv_info(is_active=False)
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self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
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self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.nodes[0].generate(CLTV_HEIGHT - 2)]
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self.nodeaddress = self.nodes[0].getnewaddress()
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self.log.info("Test that invalid-according-to-CLTV transactions can still appear in a block")
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# create one invalid tx per CLTV failure reason (5 in total) and collect them
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invalid_ctlv_txs = []
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for i in range(5):
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[i],
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self.nodeaddress, amount=1.0)
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spendtx = cltv_invalidate(self.nodes[0], spendtx, i)
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spendtx.rehash()
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invalid_ctlv_txs.append(spendtx)
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tip = self.nodes[0].getbestblockhash()
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block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
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block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
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block.nVersion = 3
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block.vtx.extend(invalid_ctlv_txs)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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self.test_cltv_info(is_active=False) # Not active as of current tip and next block does not need to obey rules
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peer.send_and_ping(msg_block(block))
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules
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assert_equal(self.nodes[0].getbestblockhash(), block.hash)
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self.log.info("Test that blocks must now be at least version 4")
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tip = block.sha256
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block_time += 1
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block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
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block.nVersion = 3
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block.solve()
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with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000003)'.format(block.hash)]):
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peer.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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peer.sync_with_ping()
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self.log.info("Test that invalid-according-to-CLTV transactions cannot appear in a block")
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block.nVersion = 4
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block.vtx.append(CTransaction()) # dummy tx after coinbase that will be replaced later
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# create and test one invalid tx per CLTV failure reason (5 in total)
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for i in range(5):
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[10+i],
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self.nodeaddress, amount=1.0)
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spendtx = cltv_invalidate(self.nodes[0], spendtx, i)
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spendtx.rehash()
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expected_cltv_reject_reason = [
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"non-mandatory-script-verify-flag (Operation not valid with the current stack size)",
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"non-mandatory-script-verify-flag (Negative locktime)",
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)",
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)",
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)",
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][i]
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# First we show that this tx is valid except for CLTV by getting it
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# rejected from the mempool for exactly that reason.
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assert_equal(
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[{
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'txid': spendtx.hash,
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'wtxid': spendtx.getwtxid(),
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'allowed': False,
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'reject-reason': expected_cltv_reject_reason,
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}],
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self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0),
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)
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# Now we verify that a block with this transaction is also invalid.
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block.vtx[1] = spendtx
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputScripts on {} failed with {}'.format(
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block.vtx[-1].hash, expected_cltv_reject_reason)]):
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peer.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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peer.sync_with_ping()
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self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
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spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
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spendtx.rehash()
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block.vtx.pop(1)
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules
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peer.send_and_ping(msg_block(block))
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self.test_cltv_info(is_active=True) # Active as of current tip
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
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if __name__ == '__main__':
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BIP65Test().main()
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