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-rwxr-xr-xtest/functional/p2p_dos_header_tree.py90
1 files changed, 90 insertions, 0 deletions
diff --git a/test/functional/p2p_dos_header_tree.py b/test/functional/p2p_dos_header_tree.py
new file mode 100755
index 0000000000..7d386c47f6
--- /dev/null
+++ b/test/functional/p2p_dos_header_tree.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 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,
+ FromHex,
+)
+from test_framework.mininode 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
+
+ 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 = [FromHex(CBlockHeader(), h) for h in self.headers]
+ self.headers_fork = [FromHex(CBlockHeader(), h) for h in self.headers_fork]
+
+ self.log.info("Feed all non-fork headers, including and up to the first checkpoint")
+ self.nodes[0].add_p2p_connection(P2PInterface())
+ self.nodes[0].p2p.send_message(msg_headers(self.headers))
+ self.nodes[0].p2p.sync_with_ping()
+ 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 (code 67)']):
+ self.nodes[0].p2p.send_message(msg_headers(self.headers_fork))
+ self.nodes[0].p2p.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'])
+ self.nodes[0].add_p2p_connection(P2PInterface())
+ self.nodes[0].p2p.send_message(msg_headers(self.headers_fork))
+ self.nodes[0].p2p.sync_with_ping()
+ 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
+ self.nodes[1].add_p2p_connection(P2PInterface())
+ self.nodes[1].p2p.send_message(msg_headers(self.headers_fork))
+ self.nodes[1].p2p.sync_with_ping()
+ assert {
+ "height": 2,
+ "hash": "00000000b0494bd6c3d5ff79c497cfce40831871cbf39b1bc28bd1dac817dc39",
+ "branchlen": 2,
+ "status": "headers-only",
+ } in self.nodes[1].getchaintips()
+
+
+if __name__ == '__main__':
+ RejectLowDifficultyHeadersTest().main()