Nicki Křížek 187e571f4d Rewrite xfer/ans11/ans.py to use AsyncDnsServer ... Replace the hand-rolled threaded socket server with the standard AsyncDnsServer framework used by other ans.py servers in the test suite. The DNS wire-format message builders (IXFR diff, AXFR, SOA, SERVFAIL) are retained unchanged since they produce carefully crafted messages needed to trigger the IXFR->AXFR race condition. The server infrastructure is replaced: - Manual TCP/UDP socket management and threading replaced by AsyncDnsServer, which handles both protocols, pidfile lifecycle, and signal handling. - Query parsing replaced by the framework's dns.message-based parser; query dispatch moved into IxfrRaceHandler.get_responses(). - The axfr_done_event threading.Event replaced by a boolean instance variable on IxfrRaceHandler, safe within the single asyncio event loop. - For IXFR over TCP, the handler yields two BytesResponseSend actions (msg1 then msg2) so the framework sends both with TCP length prefixes, preserving the race-triggering sequence. - For IXFR over UDP, the TC flag is set on the response to force TCP retry. - Unused encode_name_compressed() and parse_dns_query() removed. Also fix a timing issue that might result in the initial transfer not being done by the time the test is executed -- since ns11 is started after ns6. Ensure the initial transfer has happened before running the ixfr_race test. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>		2026-04-03 11:01:34 +00:00
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ans.py	Rewrite xfer/ans11/ans.py to use AsyncDnsServer	2026-04-03 11:01:34 +00:00