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#!/usr/bin/env python3
# Copyright (c) 2019-2021 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 that we reject low difficulty headers to prevent our block tree from filling up with useless bloat"""
from test_framework.messages import (
CBlockHeader,
from_hex,
)
from test_framework.p2p import (
P2PInterface,
msg_headers,
)
from test_framework.test_framework import BitcoinTestFramework
import os
class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.chain = 'testnet3' # Use testnet chain because it has an early checkpoint
self.num_nodes = 2
self.extra_args = [["-minimumchainwork=0x0", '-prune=550']] * self.num_nodes
def add_options(self, parser):
parser.add_argument(
'--datafile',
default='data/blockheader_testnet3.hex',
help='Test data file (default: %(default)s)',
)
def run_test(self):
self.log.info("Read headers data")
self.headers_file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), self.options.datafile)
with open(self.headers_file_path, encoding='utf-8') as headers_data:
h_lines = [l.strip() for l in headers_data.readlines()]
# The headers data is taken from testnet3 for early blocks from genesis until the first checkpoint. There are
# two headers with valid POW at height 1 and 2, forking off from genesis. They are indicated by the FORK_PREFIX.
FORK_PREFIX = 'fork:'
self.headers = [l for l in h_lines if not l.startswith(FORK_PREFIX)]
self.headers_fork = [l[len(FORK_PREFIX):] for l in h_lines if l.startswith(FORK_PREFIX)]
self.headers = [from_hex(CBlockHeader(), h) for h in self.headers]
self.headers_fork = [from_hex(CBlockHeader(), h) for h in self.headers_fork]
self.log.info("Feed all non-fork headers, including and up to the first checkpoint")
peer_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface())
peer_checkpoint.send_and_ping(msg_headers(self.headers))
assert {
'height': 546,
'hash': '000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70',
'branchlen': 546,
'status': 'headers-only',
} in self.nodes[0].getchaintips()
self.log.info("Feed all fork headers (fails due to checkpoint)")
with self.nodes[0].assert_debug_log(['bad-fork-prior-to-checkpoint']):
peer_checkpoint.send_message(msg_headers(self.headers_fork))
peer_checkpoint.wait_for_disconnect()
self.log.info("Feed all fork headers (succeeds without checkpoint)")
# On node 0 it succeeds because checkpoints are disabled
self.restart_node(0, extra_args=['-nocheckpoints', "-minimumchainwork=0x0", '-prune=550'])
peer_no_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface())
peer_no_checkpoint.send_and_ping(msg_headers(self.headers_fork))
assert {
"height": 2,
"hash": "00000000b0494bd6c3d5ff79c497cfce40831871cbf39b1bc28bd1dac817dc39",
"branchlen": 2,
"status": "headers-only",
} in self.nodes[0].getchaintips()
# On node 1 it succeeds because no checkpoint has been reached yet by a chain tip
peer_before_checkpoint = self.nodes[1].add_p2p_connection(P2PInterface())
peer_before_checkpoint.send_and_ping(msg_headers(self.headers_fork))
assert {
"height": 2,
"hash": "00000000b0494bd6c3d5ff79c497cfce40831871cbf39b1bc28bd1dac817dc39",
"branchlen": 2,
"status": "headers-only",
} in self.nodes[1].getchaintips()
if __name__ == '__main__':
RejectLowDifficultyHeadersTest().main()
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