diff options
| -rwxr-xr-x | test/functional/p2p_segwit.py | 88 |
1 files changed, 84 insertions, 4 deletions
diff --git a/test/functional/p2p_segwit.py b/test/functional/p2p_segwit.py index 79d9555abf..26636c473c 100755 --- a/test/functional/p2p_segwit.py +++ b/test/functional/p2p_segwit.py @@ -47,7 +47,7 @@ def test_transaction_acceptance(rpc, p2p, tx, with_witness, accepted, reason=Non with mininode_lock: assert_equal(p2p.last_message["reject"].reason, reason) -def test_witness_block(rpc, p2p, block, accepted, with_witness=True): +def test_witness_block(rpc, p2p, block, accepted, with_witness=True, reason=None): """Send a block to the node and check that it's accepted - Submit the block over the p2p interface @@ -58,6 +58,10 @@ def test_witness_block(rpc, p2p, block, accepted, with_witness=True): p2p.send_message(msg_block(block)) p2p.sync_with_ping() assert_equal(rpc.getbestblockhash() == block.hash, accepted) + if (reason != None and not accepted): + # Check the rejection reason as well. + with mininode_lock: + assert_equal(p2p.last_message["reject"].reason, reason) class TestP2PConn(P2PInterface): def __init__(self): @@ -271,6 +275,80 @@ class SegWitTest(BitcoinTestFramework): self.utxo.pop(0) self.utxo.append(UTXO(tx4.sha256, 0, tx4.vout[0].nValue)) + # ~6 months after segwit activation, the SCRIPT_VERIFY_WITNESS flag was + # backdated so that it applies to all blocks, going back to the genesis + # block. + # + # Consequently, version 0 witness outputs are never spendable without + # witness, and so can't be spent before segwit activation (the point at which + # blocks are permitted to contain witnesses). + def test_v0_outputs_arent_spendable(self): + self.log.info("Testing that v0 witness program outputs aren't spendable before activation") + + assert len(self.utxo), "self.utxo is empty" + + # Create two outputs, a p2wsh and p2sh-p2wsh + witness_program = CScript([OP_TRUE]) + witness_hash = sha256(witness_program) + scriptPubKey = CScript([OP_0, witness_hash]) + + p2sh_pubkey = hash160(scriptPubKey) + p2sh_scriptPubKey = CScript([OP_HASH160, p2sh_pubkey, OP_EQUAL]) + + value = self.utxo[0].nValue // 3 + + tx = CTransaction() + tx.vin = [CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b'')] + tx.vout = [CTxOut(value, scriptPubKey), CTxOut(value, p2sh_scriptPubKey)] + tx.vout.append(CTxOut(value, CScript([OP_TRUE]))) + tx.rehash() + txid = tx.sha256 + + # Add it to a block + block = self.build_next_block() + self.update_witness_block_with_transactions(block, [tx]) + # Verify that segwit isn't activated. A block serialized with witness + # should be rejected prior to activation. + test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=True, reason = b'unexpected-witness') + # Now send the block without witness. It should be accepted + test_witness_block(self.nodes[0], self.test_node, block, accepted=True, with_witness=False) + + # Now try to spend the outputs. This should fail since SCRIPT_VERIFY_WITNESS is always enabled. + p2wsh_tx = CTransaction() + p2wsh_tx.vin = [CTxIn(COutPoint(txid, 0), b'')] + p2wsh_tx.vout = [CTxOut(value, CScript([OP_TRUE]))] + p2wsh_tx.wit.vtxinwit.append(CTxInWitness()) + p2wsh_tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])] + p2wsh_tx.rehash() + + p2sh_p2wsh_tx = CTransaction() + p2sh_p2wsh_tx.vin = [CTxIn(COutPoint(txid, 1), CScript([scriptPubKey]))] + p2sh_p2wsh_tx.vout = [CTxOut(value, CScript([OP_TRUE]))] + p2sh_p2wsh_tx.wit.vtxinwit.append(CTxInWitness()) + p2sh_p2wsh_tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])] + p2sh_p2wsh_tx.rehash() + + for tx in [p2wsh_tx, p2sh_p2wsh_tx]: + + block = self.build_next_block() + self.update_witness_block_with_transactions(block, [tx]) + + # When the block is serialized with a witness, the block will be rejected because witness + # data isn't allowed in blocks that don't commit to witness data. + test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=True, reason=b'unexpected-witness') + + # When the block is serialized without witness, validation fails because the transaction is + # invalid (transactions are always validated with SCRIPT_VERIFY_WITNESS so a segwit v0 transaction + # without a witness is invalid). + # Note: The reject reason for this failure could be + # 'block-validation-failed' (if script check threads > 1) or + # 'non-mandatory-script-verify-flag (Witness program was passed an + # empty witness)' (otherwise). + # TODO: support multiple acceptable reject reasons. + test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=False) + + self.utxo.pop(0) + self.utxo.append(UTXO(txid, 2, value)) # Mine enough blocks for segwit's vb state to be 'started'. def advance_to_segwit_started(self): @@ -1476,9 +1554,10 @@ class SegWitTest(BitcoinTestFramework): block = self.build_next_block() self.update_witness_block_with_transactions(block, [spend_tx]) - # If we're before activation, then sending this without witnesses - # should be valid. If we're after activation, then sending this with - # witnesses should be valid. + # If we're after activation, then sending this with witnesses should be valid. + # This no longer works before activation, because SCRIPT_VERIFY_WITNESS + # is always set. + # TODO: rewrite this test to make clear that it only works after activation. if segwit_activated: test_witness_block(self.nodes[0].rpc, self.test_node, block, accepted=True) else: @@ -1897,6 +1976,7 @@ class SegWitTest(BitcoinTestFramework): self.test_witness_services() # Verifies NODE_WITNESS self.test_non_witness_transaction() # non-witness tx's are accepted self.test_unnecessary_witness_before_segwit_activation() + self.test_v0_outputs_arent_spendable() self.test_block_relay(segwit_activated=False) # Advance to segwit being 'started' |