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Add a reusable, bare-bones AsyncDnsServer

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Add bin/tests/system/ans.py, a bare-bones DNS server that can be used in
system tests instead of full-blown named instances when a server is only
required to return zone-based data.  Where applicable, this reduces load
on the test host and the amount of generated logs.

(cherry picked from commit 440e510f75)
This commit is contained in:
Michał Kępień 2025-12-22 11:58:39 +01:00 committed by Michał Kępień (GitLab job 6660033)
parent 1d0e19c612
commit 1a4c816344
1 changed files with 48 additions and 0 deletions
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bin/tests/system/ans.py Normal file
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"""
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.
"""
"""
This is a bare-bones DNS server that only serves data from zone files. It is
meant to be used as a replacement for full-blown named instances in system
tests when a given server is only required to return zone-based data.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
BEWARE! THIS SERVER DOES NOT NECESSARILY RETURN PROTOCOL-COMPLIANT ANSWERS!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
See AsyncDnsServer._abort_if_*() methods in isctests/asyncserver.py for more
details. Use a regular named instance for anything non-trivial.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
DO NOT ADD CUSTOM LOGIC TO THIS FILE. IT IS ONLY MEANT TO BE SYMLINKED INTO
ansX/ SUBDIRECTORIES IN SYSTEM TESTS TO REDUCE THE AMOUNT OF BOILERPLATE CODE.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
If you need to customize server behavior, implement it in a dedicated ans.py
server in the system test at hand. If an extension you are working on can be
useful in other system tests, please consider opening a merge request extending
isctest/asyncserver.py.
"""
from isctest.asyncserver import (
AsyncDnsServer,
)
def main() -> None:
server = AsyncDnsServer()
server.run()
if __name__ == "__main__":
main()