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#!/usr/bin/env python3
# Copyright (c) 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 ThreadDNSAddressSeed logic for querying DNS seeds."""
import itertools
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
class P2PDNSSeeds(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
self.extra_args = [["-dnsseed=1"]]
def run_test(self):
self.init_arg_tests()
self.existing_outbound_connections_test()
self.existing_block_relay_connections_test()
self.force_dns_test()
self.wait_time_tests()
def init_arg_tests(self):
fakeaddr = "fakenodeaddr.fakedomain.invalid."
self.log.info("Check that setting -connect disables -dnsseed by default")
self.nodes[0].stop_node()
with self.nodes[0].assert_debug_log(expected_msgs=["DNS seeding disabled"]):
self.start_node(0, [f"-connect={fakeaddr}"])
self.log.info("Check that running -connect and -dnsseed means DNS logic runs.")
with self.nodes[0].assert_debug_log(expected_msgs=["Loading addresses from DNS seed"], timeout=12):
self.restart_node(0, [f"-connect={fakeaddr}", "-dnsseed=1"])
self.log.info("Check that running -forcednsseed and -dnsseed=0 throws an error.")
self.nodes[0].stop_node()
self.nodes[0].assert_start_raises_init_error(
expected_msg="Error: Cannot set -forcednsseed to true when setting -dnsseed to false.",
extra_args=["-forcednsseed=1", "-dnsseed=0"],
)
self.log.info("Check that running -forcednsseed and -connect throws an error.")
# -connect soft sets -dnsseed to false, so throws the same error
self.nodes[0].stop_node()
self.nodes[0].assert_start_raises_init_error(
expected_msg="Error: Cannot set -forcednsseed to true when setting -dnsseed to false.",
extra_args=["-forcednsseed=1", f"-connect={fakeaddr}"],
)
# Restore default bitcoind settings
self.restart_node(0)
def existing_outbound_connections_test(self):
# Make sure addrman is populated to enter the conditional where we
# delay and potentially skip DNS seeding.
self.nodes[0].addpeeraddress("192.0.0.8", 8333)
self.log.info("Check that we *do not* query DNS seeds if we have 2 outbound connections")
self.restart_node(0)
with self.nodes[0].assert_debug_log(expected_msgs=["P2P peers available. Skipped DNS seeding."], timeout=12):
for i in range(2):
self.nodes[0].add_outbound_p2p_connection(P2PInterface(), p2p_idx=i, connection_type="outbound-full-relay")
def existing_block_relay_connections_test(self):
# Make sure addrman is populated to enter the conditional where we
# delay and potentially skip DNS seeding. No-op when run after
# existing_outbound_connections_test.
self.nodes[0].addpeeraddress("192.0.0.8", 8333)
self.log.info("Check that we *do* query DNS seeds if we only have 2 block-relay-only connections")
self.restart_node(0)
with self.nodes[0].assert_debug_log(expected_msgs=["Loading addresses from DNS seed"], timeout=12):
# This mimics the "anchors" logic where nodes are likely to
# reconnect to block-relay-only connections on startup.
# Since we do not participate in addr relay with these connections,
# we still want to query the DNS seeds.
for i in range(2):
self.nodes[0].add_outbound_p2p_connection(P2PInterface(), p2p_idx=i, connection_type="block-relay-only")
def force_dns_test(self):
self.log.info("Check that we query DNS seeds if -forcednsseed param is set")
with self.nodes[0].assert_debug_log(expected_msgs=["Loading addresses from DNS seed"], timeout=12):
# -dnsseed defaults to 1 in bitcoind, but 0 in the test framework,
# so pass it explicitly here
self.restart_node(0, ["-forcednsseed", "-dnsseed=1"])
# Restore default for subsequent tests
self.restart_node(0)
def wait_time_tests(self):
self.log.info("Check the delay before querying DNS seeds")
# Populate addrman with < 1000 addresses
for i in range(5):
a = f"192.0.0.{i}"
self.nodes[0].addpeeraddress(a, 8333)
# The delay should be 11 seconds
with self.nodes[0].assert_debug_log(expected_msgs=["Waiting 11 seconds before querying DNS seeds.\n"]):
self.restart_node(0)
# Populate addrman with > 1000 addresses
for i in itertools.count():
first_octet = i % 2 + 1
second_octet = i % 256
third_octet = i % 100
a = f"{first_octet}.{second_octet}.{third_octet}.1"
self.nodes[0].addpeeraddress(a, 8333)
if (i > 1000 and i % 100 == 0):
# The addrman size is non-deterministic because new addresses
# are sorted into buckets, potentially displacing existing
# addresses. Periodically check if we have met the desired
# threshold.
if len(self.nodes[0].getnodeaddresses(0)) > 1000:
break
# The delay should be 5 mins
with self.nodes[0].assert_debug_log(expected_msgs=["Waiting 300 seconds before querying DNS seeds.\n"]):
self.restart_node(0)
if __name__ == '__main__':
P2PDNSSeeds(__file__).main()
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