Arunabha DasandGitHub 5b58a872ef Allow synthesized DNAME TTL=0 to be served from cache within grace period (#1411) ...

* Allow synthesized DNAME TTL=0 to be served from cache within grace period

Addresses doc/TODO: cache TTL=0 packets properly for synthesis.
- rrset_cache_lookup: allow TTL=0 DNAME within 1s grace for synthesis
- synth_dname_msg: support PACKED_RRSET_UPSTREAM_0TTL, return TTL=0 to client

Reduces recursion when authoritative servers return DNAME with TTL=0 (RFC 2308).
Client response still correctly returns TTL=0.

Note: Test with proper TTL=0 DNSSEC RRSIGs omitted - requires ldns-signzone
to generate valid signatures for TTL=0 RRsets.

* Add iter_dname_ttl0.rpl replay test for DNAME TTL=0
Tests signed DNAME with TTL=0 and RRSIG Original TTL=0 (RFC 4034).
Verifies end-to-end handling of TTL=0 DNAME responses.

2026-03-03 08:51:31 +01:00

..

dns.c

Allow synthesized DNAME TTL=0 to be served from cache within grace period (#1411)

2026-03-03 08:51:31 +01:00

dns.h

A few changes for TTL processing:

2025-09-15 10:03:35 +02:00

infra.c

- Note clearly that 'wait-limit: 0' disables all wait limits.

2025-10-03 16:44:44 +02:00

infra.h

Fast Reload Option (#1042)

2025-03-31 15:25:24 +02:00

rrset.c

Allow synthesized DNAME TTL=0 to be served from cache within grace period (#1411)

2026-03-03 08:51:31 +01:00

rrset.h

- When a granchild delegation is returned, remove any cached child delegations

2024-04-22 15:46:06 +02:00