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txn_clone.py
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#!/usr/bin/env python3
# Copyright (c) 2014-2016 The Machinecoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
# Test proper accounting with an equivalent malleability clone
#
from test_framework.test_framework import MachinecoinTestFramework
from test_framework.util import *
class TxnMallTest(MachinecoinTestFramework):
def __init__(self):
super().__init__()
self.num_nodes = 4
self.setup_clean_chain = False
def add_options(self, parser):
parser.add_option("--mineblock", dest="mine_block", default=False, action="store_true",
help="Test double-spend of 1-confirmed transaction")
def setup_network(self):
# Start with split network:
return super(TxnMallTest, self).setup_network(True)
def run_test(self):
# All nodes should start with 1,250 BTC:
starting_balance = 1250
for i in range(4):
assert_equal(self.nodes[i].getbalance(), starting_balance)
self.nodes[i].getnewaddress("") # bug workaround, coins generated assigned to first getnewaddress!
# Assign coins to foo and bar accounts:
self.nodes[0].settxfee(.001)
node0_address_foo = self.nodes[0].getnewaddress("foo")
fund_foo_txid = self.nodes[0].sendfrom("", node0_address_foo, 1219)
fund_foo_tx = self.nodes[0].gettransaction(fund_foo_txid)
node0_address_bar = self.nodes[0].getnewaddress("bar")
fund_bar_txid = self.nodes[0].sendfrom("", node0_address_bar, 29)
fund_bar_tx = self.nodes[0].gettransaction(fund_bar_txid)
assert_equal(self.nodes[0].getbalance(""),
starting_balance - 1219 - 29 + fund_foo_tx["fee"] + fund_bar_tx["fee"])
# Coins are sent to node1_address
node1_address = self.nodes[1].getnewaddress("from0")
# Send tx1, and another transaction tx2 that won't be cloned
txid1 = self.nodes[0].sendfrom("foo", node1_address, 40, 0)
txid2 = self.nodes[0].sendfrom("bar", node1_address, 20, 0)
# Construct a clone of tx1, to be malleated
rawtx1 = self.nodes[0].getrawtransaction(txid1,1)
clone_inputs = [{"txid":rawtx1["vin"][0]["txid"],"vout":rawtx1["vin"][0]["vout"]}]
clone_outputs = {rawtx1["vout"][0]["scriptPubKey"]["addresses"][0]:rawtx1["vout"][0]["value"],
rawtx1["vout"][1]["scriptPubKey"]["addresses"][0]:rawtx1["vout"][1]["value"]}
clone_locktime = rawtx1["locktime"]
clone_raw = self.nodes[0].createrawtransaction(clone_inputs, clone_outputs, clone_locktime)
# createrawtransaction randomizes the order of its outputs, so swap them if necessary.
# output 0 is at version+#inputs+input+sigstub+sequence+#outputs
# 40 BTC serialized is 00286bee00000000
pos0 = 2*(4+1+36+1+4+1)
hex40 = "00286bee00000000"
output_len = 16 + 2 + 2 * int("0x" + clone_raw[pos0 + 16 : pos0 + 16 + 2], 0)
if (rawtx1["vout"][0]["value"] == 40 and clone_raw[pos0 : pos0 + 16] != hex40 or
rawtx1["vout"][0]["value"] != 40 and clone_raw[pos0 : pos0 + 16] == hex40):
output0 = clone_raw[pos0 : pos0 + output_len]
output1 = clone_raw[pos0 + output_len : pos0 + 2 * output_len]
clone_raw = clone_raw[:pos0] + output1 + output0 + clone_raw[pos0 + 2 * output_len:]
# Use a different signature hash type to sign. This creates an equivalent but malleated clone.
# Don't send the clone anywhere yet
tx1_clone = self.nodes[0].signrawtransaction(clone_raw, None, None, "ALL|ANYONECANPAY")
assert_equal(tx1_clone["complete"], True)
# Have node0 mine a block, if requested:
if (self.options.mine_block):
self.nodes[0].generate(1)
sync_blocks(self.nodes[0:2])
tx1 = self.nodes[0].gettransaction(txid1)
tx2 = self.nodes[0].gettransaction(txid2)
# Node0's balance should be starting balance, plus 50BTC for another
# matured block, minus tx1 and tx2 amounts, and minus transaction fees:
expected = starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"]
if self.options.mine_block: expected += 50
expected += tx1["amount"] + tx1["fee"]
expected += tx2["amount"] + tx2["fee"]
assert_equal(self.nodes[0].getbalance(), expected)
# foo and bar accounts should be debited:
assert_equal(self.nodes[0].getbalance("foo", 0), 1219 + tx1["amount"] + tx1["fee"])
assert_equal(self.nodes[0].getbalance("bar", 0), 29 + tx2["amount"] + tx2["fee"])
if self.options.mine_block:
assert_equal(tx1["confirmations"], 1)
assert_equal(tx2["confirmations"], 1)
# Node1's "from0" balance should be both transaction amounts:
assert_equal(self.nodes[1].getbalance("from0"), -(tx1["amount"] + tx2["amount"]))
else:
assert_equal(tx1["confirmations"], 0)
assert_equal(tx2["confirmations"], 0)
# Send clone and its parent to miner
self.nodes[2].sendrawtransaction(fund_foo_tx["hex"])
txid1_clone = self.nodes[2].sendrawtransaction(tx1_clone["hex"])
# ... mine a block...
self.nodes[2].generate(1)
# Reconnect the split network, and sync chain:
connect_nodes(self.nodes[1], 2)
self.nodes[2].sendrawtransaction(fund_bar_tx["hex"])
self.nodes[2].sendrawtransaction(tx2["hex"])
self.nodes[2].generate(1) # Mine another block to make sure we sync
sync_blocks(self.nodes)
# Re-fetch transaction info:
tx1 = self.nodes[0].gettransaction(txid1)
tx1_clone = self.nodes[0].gettransaction(txid1_clone)
tx2 = self.nodes[0].gettransaction(txid2)
# Verify expected confirmations
assert_equal(tx1["confirmations"], -2)
assert_equal(tx1_clone["confirmations"], 2)
assert_equal(tx2["confirmations"], 1)
# Check node0's total balance; should be same as before the clone, + 100 BTC for 2 matured,
# less possible orphaned matured subsidy
expected += 100
if (self.options.mine_block):
expected -= 50
assert_equal(self.nodes[0].getbalance(), expected)
assert_equal(self.nodes[0].getbalance("*", 0), expected)
# Check node0's individual account balances.
# "foo" should have been debited by the equivalent clone of tx1
assert_equal(self.nodes[0].getbalance("foo"), 1219 + tx1["amount"] + tx1["fee"])
# "bar" should have been debited by (possibly unconfirmed) tx2
assert_equal(self.nodes[0].getbalance("bar", 0), 29 + tx2["amount"] + tx2["fee"])
# "" should have starting balance, less funding txes, plus subsidies
assert_equal(self.nodes[0].getbalance("", 0), starting_balance
- 1219
+ fund_foo_tx["fee"]
- 29
+ fund_bar_tx["fee"]
+ 100)
# Node1's "from0" account balance
assert_equal(self.nodes[1].getbalance("from0", 0), -(tx1["amount"] + tx2["amount"]))
if __name__ == '__main__':
TxnMallTest().main()