#!/usr/bin/python3 # Copyright (C) Internet Systems Consortium, Inc. ("ISC") # # SPDX-License-Identifier: MPL-2.0 # # This Source Code Form is subject to the terms of the Mozilla Public # License, v. 2.0. If a copy of the MPL was not distributed with this # file, you can obtain one at https://mozilla.org/MPL/2.0/. # # See the COPYRIGHT file distributed with this work for additional # information regarding copyright ownership. import os import re import subprocess import pytest pytest.importorskip("dns", minversion="2.0.0") import dns.resolver def run_rndc(server, rndc_command): """ Send the specified 'rndc_command' to 'server' with a timeout of 10 seconds """ rndc = os.getenv("RNDC") port = os.getenv("CONTROLPORT") cmdline = [rndc, "-c", "../common/rndc.conf", "-p", port, "-s", server] cmdline.extend(rndc_command) subprocess.check_output(cmdline, stderr=subprocess.STDOUT, timeout=10) def test_dnstap_dispatch_socket_addresses(named_port): # Prepare for querying ns3. resolver = dns.resolver.Resolver() resolver.nameservers = ["10.53.0.3"] resolver.port = named_port # Send some query to ns3 so that it records something in its dnstap file. ans = resolver.resolve("mail.example.", "A") assert ans[0].address == "10.0.0.2" # Before continuing, roll dnstap file to ensure it is flushed to disk. run_rndc("10.53.0.3", ["dnstap", "-roll", "1"]) # Move the dnstap file aside so that it is retained for troubleshooting. os.rename(os.path.join("ns3", "dnstap.out.0"), "dnstap.out.resolver_addresses") # Read the contents of the dnstap file using dnstap-read. output = subprocess.check_output( [os.getenv("DNSTAPREAD"), "dnstap.out.resolver_addresses"], encoding="utf-8" ) # Check whether all frames contain the expected addresses. # # Expected dnstap-read output format: # # 22-Jun-2022 12:09:06.168 RR 10.53.0.3:0 -> 10.53.0.1:7523 TCP ... # 22-Jun-2022 12:09:06.168 RR 10.53.0.3:0 <- 10.53.0.1:7523 TCP ... # 22-Jun-2022 12:09:06.168 RQ 10.53.0.3:56306 -> 10.53.0.2:7523 UDP ... # 22-Jun-2022 12:09:06.168 RQ 10.53.0.3:56306 <- 10.53.0.2:7523 UDP ... # bad_frames = [] inspected_frames = 0 addr_regex = r"^10\.53\.0\.[0-9]+:[0-9]{1,5}$" for line in output.splitlines(): _, _, frame_type, addr1, _, addr2, _ = line.split(" ", 6) # Only inspect RESOLVER_QUERY and RESOLVER_RESPONSE frames. if frame_type not in ("RQ", "RR"): continue inspected_frames += 1 if not re.match(addr_regex, addr1) or not re.match(addr_regex, addr2): bad_frames.append(line) assert ( len(bad_frames) == 0 ), "{} out of {} inspected frames contain unexpected addresses:\n\n{}".format( len(bad_frames), inspected_frames, "\n".join(bad_frames) )