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1f5c2ea8e5
Add a system test that checks whether IP addresses are present in a dnstap capture of resolver traffic if "query-source" is explicitly set.
83 lines
2.8 KiB
Python
83 lines
2.8 KiB
Python
#!/usr/bin/python3
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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# SPDX-License-Identifier: MPL-2.0
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at https://mozilla.org/MPL/2.0/.
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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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import os
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import re
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import subprocess
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import pytest
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pytest.importorskip("dns")
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import dns.resolver
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def run_rndc(server, rndc_command):
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"""
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Send the specified 'rndc_command' to 'server' with a timeout of 10 seconds
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"""
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rndc = os.getenv("RNDC")
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port = os.getenv("CONTROLPORT")
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cmdline = [rndc, "-c", "../common/rndc.conf", "-p", port, "-s", server]
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cmdline.extend(rndc_command)
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subprocess.check_output(cmdline, stderr=subprocess.STDOUT, timeout=10)
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def test_dnstap_dispatch_socket_addresses(named_port):
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# Prepare for querying ns3.
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resolver = dns.resolver.Resolver()
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resolver.nameservers = ["10.53.0.3"]
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resolver.port = named_port
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# Send some query to ns3 so that it records something in its dnstap file.
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ans = resolver.query("mail.example.", "A")
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assert ans[0].address == "10.0.0.2"
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# Before continuing, roll dnstap file to ensure it is flushed to disk.
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run_rndc("10.53.0.3", ["dnstap", "-roll", "1"])
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# Move the dnstap file aside so that it is retained for troubleshooting.
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os.rename(os.path.join("ns3", "dnstap.out.0"), "dnstap.out.resolver_addresses")
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# Read the contents of the dnstap file using dnstap-read.
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output = subprocess.check_output(
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[os.getenv("DNSTAPREAD"), "dnstap.out.resolver_addresses"], encoding="utf-8"
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)
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# Check whether all frames contain the expected addresses.
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#
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# Expected dnstap-read output format:
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#
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# 22-Jun-2022 12:09:06.168 RR 10.53.0.3:0 -> 10.53.0.1:7523 TCP ...
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# 22-Jun-2022 12:09:06.168 RR 10.53.0.3:0 <- 10.53.0.1:7523 TCP ...
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# 22-Jun-2022 12:09:06.168 RQ 10.53.0.3:56306 -> 10.53.0.2:7523 UDP ...
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# 22-Jun-2022 12:09:06.168 RQ 10.53.0.3:56306 <- 10.53.0.2:7523 UDP ...
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#
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bad_frames = []
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inspected_frames = 0
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addr_regex = r"^10\.53\.0\.[0-9]+:[0-9]{1,5}$"
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for line in output.splitlines():
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_, _, frame_type, addr1, _, addr2, _ = line.split(" ", 6)
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# Only inspect RESOLVER_QUERY and RESOLVER_RESPONSE frames.
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if frame_type not in ("RQ", "RR"):
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continue
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inspected_frames += 1
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if not re.match(addr_regex, addr1) or not re.match(addr_regex, addr2):
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bad_frames.append(line)
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assert (
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len(bad_frames) == 0
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), "{} out of {} inspected frames contain unexpected addresses:\n\n{}".format(
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len(bad_frames), inspected_frames, "\n".join(bad_frames)
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)
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