1 files changed, 160 insertions, 0 deletions
diff --git a/test/functional/feature_cltv.py b/test/functional/feature_cltv.py
new file mode 100755
index 0000000000..f62ae31654
--- /dev/null
+++ b/test/functional/feature_cltv.py
@@ -0,0 +1,160 @@
+#!/usr/bin/env python3
+# Copyright (c) 2015-2017 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.test_framework import BitcoinTestFramework
+from test_framework.util import *
+from test_framework.mininode import *
+from test_framework.blocktools import create_coinbase, create_block
+from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP, CScriptNum
+from io import BytesIO
+
+CLTV_HEIGHT = 1351
+
+# Reject codes that we might receive in this test
+REJECT_INVALID = 16
+REJECT_OBSOLETE = 17
+REJECT_NONSTANDARD = 64
+
+def cltv_invalidate(tx):
+    '''Modify the signature in vin 0 of the tx to fail CLTV
+
+    Prepends -1 CLTV DROP in the scriptSig itself.
+
+    TODO: test more ways that transactions using CLTV could be invalid (eg
+    locktime requirements fail, sequence time requirements fail, etc).
+    '''
+    tx.vin[0].scriptSig = CScript([OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
+                                  list(CScript(tx.vin[0].scriptSig)))
+
+def cltv_validate(node, tx, height):
+    '''Modify the signature in vin 0 of the tx to pass CLTV
+    Prepends <height> CLTV DROP in the scriptSig, and sets
+    the locktime to height'''
+    tx.vin[0].nSequence = 0
+    tx.nLockTime = height
+
+    # Need to re-sign, since nSequence and nLockTime changed
+    signed_result = node.signrawtransaction(ToHex(tx))
+    new_tx = CTransaction()
+    new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
+
+    new_tx.vin[0].scriptSig = CScript([CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
+                                  list(CScript(new_tx.vin[0].scriptSig)))
+    return new_tx
+
+def create_transaction(node, coinbase, to_address, amount):
+    from_txid = node.getblock(coinbase)['tx'][0]
+    inputs = [{ "txid" : from_txid, "vout" : 0}]
+    outputs = { to_address : amount }
+    rawtx = node.createrawtransaction(inputs, outputs)
+    signresult = node.signrawtransaction(rawtx)
+    tx = CTransaction()
+    tx.deserialize(BytesIO(hex_str_to_bytes(signresult['hex'])))
+    return tx
+
+class BIP65Test(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.extra_args = [['-promiscuousmempoolflags=1', '-whitelist=127.0.0.1']]
+        self.setup_clean_chain = True
+
+    def run_test(self):
+        self.nodes[0].add_p2p_connection(P2PInterface())
+
+        network_thread_start()
+
+        # wait_for_verack ensures that the P2P connection is fully up.
+        self.nodes[0].p2p.wait_for_verack()
+
+        self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
+        self.coinbase_blocks = self.nodes[0].generate(CLTV_HEIGHT - 2)
+        self.nodeaddress = self.nodes[0].getnewaddress()
+
+        self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
+
+        spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[0],
+                self.nodeaddress, 1.0)
+        cltv_invalidate(spendtx)
+        spendtx.rehash()
+
+        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.append(spendtx)
+        block.hashMerkleRoot = block.calc_merkle_root()
+        block.solve()
+
+        self.nodes[0].p2p.send_and_ping(msg_block(block))
+        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()
+        self.nodes[0].p2p.send_and_ping(msg_block(block))
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
+
+        wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
+        with mininode_lock:
+            assert_equal(self.nodes[0].p2p.last_message["reject"].code, REJECT_OBSOLETE)
+            assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'bad-version(0x00000003)')
+            assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
+            del self.nodes[0].p2p.last_message["reject"]
+
+        self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
+        block.nVersion = 4
+
+        spendtx = create_transaction(self.nodes[0], self.coinbase_blocks[1],
+                self.nodeaddress, 1.0)
+        cltv_invalidate(spendtx)
+        spendtx.rehash()
+
+        # First we show that this tx is valid except for CLTV by getting it
+        # accepted to the mempool (which we can achieve with
+        # -promiscuousmempoolflags).
+        self.nodes[0].p2p.send_and_ping(msg_tx(spendtx))
+        assert spendtx.hash in self.nodes[0].getrawmempool()
+
+        # Now we verify that a block with this transaction is invalid.
+        block.vtx.append(spendtx)
+        block.hashMerkleRoot = block.calc_merkle_root()
+        block.solve()
+
+        self.nodes[0].p2p.send_and_ping(msg_block(block))
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
+
+        wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
+        with mininode_lock:
+            assert self.nodes[0].p2p.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
+            assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
+            if self.nodes[0].p2p.last_message["reject"].code == REJECT_INVALID:
+                # Generic rejection when a block is invalid
+                assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'block-validation-failed')
+            else:
+                assert b'Negative locktime' in self.nodes[0].p2p.last_message["reject"].reason
+
+        self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
+        spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
+        spendtx.rehash()
+
+        block.vtx.pop(1)
+        block.vtx.append(spendtx)
+        block.hashMerkleRoot = block.calc_merkle_root()
+        block.solve()
+
+        self.nodes[0].p2p.send_and_ping(msg_block(block))
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+
+if __name__ == '__main__':
+    BIP65Test().main()