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Serve stale (#159)

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- Added serve-stale functionality as described in
  draft-ietf-dnsop-serve-stale-10. `serve-expired-*` options can be used
  to configure the behavior.
- Updated cachedb to honor `serve-expired-ttl`; Fixes #107.
- Renamed statistic `num.zero_ttl` to `num.expired` as expired replies
  come with a configurable TTL value (`serve-expired-reply-ttl`).
- Fixed stats when replying with cached, cname-aliased records.
- Added missing default values for redis cachedb backend.
This commit is contained in:
gthess
2020-02-05 14:20:27 +01:00
committed by GitHub
parent 5980d9c389
commit f7fe95ad7b
38 changed files with 4691 additions and 3212 deletions
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util/data/msgparse.h
+4
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@@ -79,8 +79,12 @@ extern time_t MAX_TTL;
extern time_t MIN_TTL;
/** Maximum Negative TTL that is allowed */
extern time_t MAX_NEG_TTL;
/** If we serve expired entries and prefetch them */
extern int SERVE_EXPIRED;
/** Time to serve records after expiration */
extern time_t SERVE_EXPIRED_TTL;
/** TTL to use for expired records */
extern time_t SERVE_EXPIRED_REPLY_TTL;
/** Negative cache time (for entries without any RRs.) */
#define NORR_TTL 5 /* seconds */