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#!/usr/bin/env python3
# Copyright (c) 2015-2016 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 node responses to invalid blocks.
In this test we connect to one node over p2p, and test block requests:
1) Valid blocks should be requested and become chain tip.
2) Invalid block with duplicated transaction should be re-requested.
3) Invalid block with bad coinbase value should be rejected and not
re-requested.
"""
from test_framework.test_framework import ComparisonTestFramework
from test_framework.util import *
from test_framework.comptool import TestManager, TestInstance, RejectResult
from test_framework.blocktools import *
import copy
import time
# Use the ComparisonTestFramework with 1 node: only use --testbinary.
class InvalidBlockRequestTest(ComparisonTestFramework):
''' Can either run this test as 1 node with expected answers, or two and compare them.
Change the "outcome" variable from each TestInstance object to only do the comparison. '''
def __init__(self):
super().__init__()
self.num_nodes = 1
def run_test(self):
test = TestManager(self, self.options.tmpdir)
test.add_all_connections(self.nodes)
self.tip = None
self.block_time = None
NetworkThread().start() # Start up network handling in another thread
test.run()
def get_tests(self):
if self.tip is None:
self.tip = int("0x" + self.nodes[0].getbestblockhash(), 0)
self.block_time = int(time.time())+1
'''
Create a new block with an anyone-can-spend coinbase
'''
height = 1
block = create_block(self.tip, create_coinbase(height), self.block_time)
self.block_time += 1
block.solve()
# Save the coinbase for later
self.block1 = block
self.tip = block.sha256
height += 1
yield TestInstance([[block, True]])
'''
Now we need that block to mature so we can spend the coinbase.
'''
test = TestInstance(sync_every_block=False)
for i in range(100):
block = create_block(self.tip, create_coinbase(height), self.block_time)
block.solve()
self.tip = block.sha256
self.block_time += 1
test.blocks_and_transactions.append([block, True])
height += 1
yield test
'''
Now we use merkle-root malleability to generate an invalid block with
same blockheader.
Manufacture a block with 3 transactions (coinbase, spend of prior
coinbase, spend of that spend). Duplicate the 3rd transaction to
leave merkle root and blockheader unchanged but invalidate the block.
'''
block2 = create_block(self.tip, create_coinbase(height), self.block_time)
self.block_time += 1
# b'0x51' is OP_TRUE
tx1 = create_transaction(self.block1.vtx[0], 0, b'\x51', 50 * COIN)
tx2 = create_transaction(tx1, 0, b'\x51', 50 * COIN)
block2.vtx.extend([tx1, tx2])
block2.hashMerkleRoot = block2.calc_merkle_root()
block2.rehash()
block2.solve()
orig_hash = block2.sha256
block2_orig = copy.deepcopy(block2)
# Mutate block 2
block2.vtx.append(tx2)
assert_equal(block2.hashMerkleRoot, block2.calc_merkle_root())
assert_equal(orig_hash, block2.rehash())
assert(block2_orig.vtx != block2.vtx)
self.tip = block2.sha256
yield TestInstance([[block2, RejectResult(16, b'bad-txns-duplicate')], [block2_orig, True]])
height += 1
'''
Make sure that a totally screwed up block is not valid.
'''
block3 = create_block(self.tip, create_coinbase(height), self.block_time)
self.block_time += 1
block3.vtx[0].vout[0].nValue = 100 * COIN # Too high!
block3.vtx[0].sha256=None
block3.vtx[0].calc_sha256()
block3.hashMerkleRoot = block3.calc_merkle_root()
block3.rehash()
block3.solve()
yield TestInstance([[block3, RejectResult(16, b'bad-cb-amount')]])
if __name__ == '__main__':
InvalidBlockRequestTest().main()
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