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         node0 = NodeConnCB()
  70         connections = []
  71         connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0))
  72         node0.add_connection(connections[0])
  73
  74         NetworkThread().start() # Start up network handling in another thread
  75
  76         # wait_for_verack ensures that the P2P connection is fully up.
  77         node0.wait_for_verack()
  78
  79         self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
  80         self.coinbase_blocks = self.nodes[0].generate(CLTV_HEIGHT - 2)
  81         self.nodeaddress = self.nodes[0].getnewaddress()
  82
  83         self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
  84
  85         spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[0],
  86                 self.nodeaddress, 1.0)
  87         cltv_invalidate(spendtx)
  88         spendtx.rehash()
  89
  90         tip = self.nodes[0].getbestblockhash()
  91         block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
  92         block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
  93         block.nVersion = 3
  94         block.vtx.append(spendtx)
  95         block.hashMerkleRoot = block.calc_merkle_root()
  96         block.solve()
  97
  98         node0.send_and_ping(msg_block(block))
  99         assert_equal(self.nodes[0].getbestblockhash(), block.hash)
 100
 101         self.log.info("Test that blocks must now be at least version 4")
 102         tip = block.sha256
 103         block_time += 1
 104         block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
 105         block.nVersion = 3
 106         block.solve()
 107         node0.send_and_ping(msg_block(block))
 108         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 109
 110         wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
 111         with mininode_lock:
 112             assert_equal(node0.last_message["reject"].code, REJECT_OBSOLETE)
 113             assert_equal(node0.last_message["reject"].reason, b'bad-version(0x00000003)')
 114             assert_equal(node0.last_message["reject"].data, block.sha256)
 115             del node0.last_message["reject"]
 116
 117         self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
 118         block.nVersion = 4
 119
 120         spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[1],
 121                 self.nodeaddress, 1.0)
 122         cltv_invalidate(spendtx)
 123         spendtx.rehash()
 124
 125         # First we show that this tx is valid except for CLTV by getting it
 126         # accepted to the mempool (which we can achieve with
 127         # -promiscuousmempoolflags).
 128         node0.send_and_ping(msg_tx(spendtx))
 129         assert spendtx.hash in self.nodes[0].getrawmempool()
 130
 131         # Now we verify that a block with this transaction is invalid.
 132         block.vtx.append(spendtx)
 133         block.hashMerkleRoot = block.calc_merkle_root()
 134         block.solve()
 135
 136         node0.send_and_ping(msg_block(block))
 137         assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
 138
 139         wait_until(lambda: "reject" in node0.last_message.keys(), lock=mininode_lock)
 140         with mininode_lock:
 141             assert node0.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
 142             assert_equal(node0.last_message["reject"].data, block.sha256)
 143             if node0.last_message["reject"].code == REJECT_INVALID:
 144                 # Generic rejection when a block is invalid
 145                 assert_equal(node0.last_message["reject"].reason, b'block-validation-failed')
 146             else:
 147                 assert b'Negative locktime' in node0.last_message["reject"].reason
 148
 149         self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
 150         spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
 151         spendtx.rehash()
 152
 153         block.vtx.pop(1)
 154         block.vtx.append(spendtx)
 155         block.hashMerkleRoot = block.calc_merkle_root()
 156         block.solve()
 157
 158         node0.send_and_ping(msg_block(block))
 159         assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
 160
 161
 162 if __name__ == '__main__':
 163     BIP65Test().main()