test/functional/bip65-cltv-p2p.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2015-2016 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5 """Test BIP65 (CHECKLOCKTIMEVERIFY).
   6
   7 Test that the CHECKLOCKTIMEVERIFY soft-fork activates at (regtest) block height
   8 1351.
   9 """
  10
  11 from test_framework.test_framework import BitcoinTestFramework
  12 from test_framework.util import *
  13 from test_framework.mininode import *
  14 from test_framework.blocktools import create_coinbase, create_block
  15 from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP, CScriptNum
  16 from io import BytesIO
  17
  18 CLTV_HEIGHT = 1351
  19
  20 # Reject codes that we might receive in this test
  21 REJECT_INVALID = 16
  22 REJECT_OBSOLETE = 17
  23 REJECT_NONSTANDARD = 64
  24
  25 def cltv_invalidate(tx):
  26     '''Modify the signature in vin 0 of the tx to fail CLTV
  27
  28     Prepends -1 CLTV DROP in the scriptSig itself.
  29
  30     TODO: test more ways that transactions using CLTV could be invalid (eg
  31     locktime requirements fail, sequence time requirements fail, etc).
  32     '''
  33     tx.vin[0].scriptSig = CScript([OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
  34                                   list(CScript(tx.vin[0].scriptSig)))
  35
  36 def cltv_validate(node, tx, height):
  37     '''Modify the signature in vin 0 of the tx to pass CLTV
  38     Prepends <height> CLTV DROP in the scriptSig, and sets
  39     the locktime to height'''
  40     tx.vin[0].nSequence = 0
  41     tx.nLockTime = height
  42
  43     # Need to re-sign, since nSequence and nLockTime changed
  44     signed_result = node.signrawtransaction(ToHex(tx))
  45     new_tx = CTransaction()
  46     new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
  47
  48     new_tx.vin[0].scriptSig = CScript([CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
  49                                   list(CScript(new_tx.vin[0].scriptSig)))
  50     return new_tx
  51
  52 def create_transaction(node, coinbase, to_address, amount):
  53     from_txid = node.getblock(coinbase)['tx'][0]
  54     inputs = [{ "txid" : from_txid, "vout" : 0}]
  55     outputs = { to_address : amount }
  56     rawtx = node.createrawtransaction(inputs, outputs)
  57     signresult = node.signrawtransaction(rawtx)
  58     tx = CTransaction()
  59     tx.deserialize(BytesIO(hex_str_to_bytes(signresult['hex'])))
  60     return tx
  61
  62 class BIP65Test(BitcoinTestFramework):
  63     def set_test_params(self):
  64         self.num_nodes = 1
  65         self.extra_args = [['-promiscuousmempoolflags=1', '-whitelist=127.0.0.1']]
  66         self.setup_clean_chain = True
  67
  68     def run_test(self):
  69         self.nodes[0].add_p2p_connection(P2PInterface())
  70
  71         network_thread_start()
  72
  73         # wait_for_verack ensures that the P2P connection is fully up.
  74         self.nodes[0].p2p.wait_for_verack()
  75
  76         self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
  77         self.coinbase_blocks = self.nodes[0].generate(CLTV_HEIGHT - 2)
  78         self.nodeaddress = self.nodes[0].getnewaddress()
  79
  80         self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
  81
  82         spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[0],
  83                 self.nodeaddress, 1.0)
  84         cltv_invalidate(spendtx)
  85         spendtx.rehash()
  86
  87         tip = self.nodes[0].getbestblockhash()
  88         block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
  89         block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
  90         block.nVersion = 3
  91         block.vtx.append(spendtx)
  92         block.hashMerkleRoot = block.calc_merkle_root()
  93         block.solve()
  94
  95         self.nodes[0].p2p.send_and_ping(msg_block(block))
  96         assert_equal(self.nodes[0].getbestblockhash(), block.hash)
  97
  98         self.log.info("Test that blocks must now be at least version 4")
  99         tip = block.sha256
 100         block_time += 1
 101         block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
 102         block.nVersion = 3
 103         block.solve()
 104         self.nodes[0].p2p.send_and_ping(msg_block(block))
 105         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 106
 107         wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
 108         with mininode_lock:
 109             assert_equal(self.nodes[0].p2p.last_message["reject"].code, REJECT_OBSOLETE)
 110             assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'bad-version(0x00000003)')
 111             assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
 112             del self.nodes[0].p2p.last_message["reject"]
 113
 114         self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
 115         block.nVersion = 4
 116
 117         spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[1],
 118                 self.nodeaddress, 1.0)
 119         cltv_invalidate(spendtx)
 120         spendtx.rehash()
 121
 122         # First we show that this tx is valid except for CLTV by getting it
 123         # accepted to the mempool (which we can achieve with
 124         # -promiscuousmempoolflags).
 125         self.nodes[0].p2p.send_and_ping(msg_tx(spendtx))
 126         assert spendtx.hash in self.nodes[0].getrawmempool()
 127
 128         # Now we verify that a block with this transaction is invalid.
 129         block.vtx.append(spendtx)
 130         block.hashMerkleRoot = block.calc_merkle_root()
 131         block.solve()
 132
 133         self.nodes[0].p2p.send_and_ping(msg_block(block))
 134         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 135
 136         wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
 137         with mininode_lock:
 138             assert self.nodes[0].p2p.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
 139             assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
 140             if self.nodes[0].p2p.last_message["reject"].code == REJECT_INVALID:
 141                 # Generic rejection when a block is invalid
 142                 assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'block-validation-failed')
 143             else:
 144                 assert b'Negative locktime' in self.nodes[0].p2p.last_message["reject"].reason
 145
 146         self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
 147         spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
 148         spendtx.rehash()
 149
 150         block.vtx.pop(1)
 151         block.vtx.append(spendtx)
 152         block.hashMerkleRoot = block.calc_merkle_root()
 153         block.solve()
 154
 155         self.nodes[0].p2p.send_and_ping(msg_block(block))
 156         assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
 157
 158
 159 if __name__ == '__main__':
 160     BIP65Test().main()