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