diff options
Diffstat (limited to 'util/data/msgparse.h')
| -rw-r--r-- | util/data/msgparse.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/util/data/msgparse.h b/util/data/msgparse.h index 7de4e394f2ae..373de677d27c 100644 --- a/util/data/msgparse.h +++ b/util/data/msgparse.h @@ -98,6 +98,31 @@ extern time_t SERVE_EXPIRED_REPLY_TTL; /** If we serve the original TTL or decrementing TTLs */ extern int SERVE_ORIGINAL_TTL; +/** calculate the prefetch TTL as 90% of original. Calculation + * without numerical overflow (uin32_t) */ +#define PREFETCH_TTL_CALC(ttl) ((ttl) - (ttl)/10) + +/* caclulate the TTL used for expired answers to somewhat make sense wrt the + * original TTL; don't reply with higher TTL than the original */ +#ifdef UNBOUND_DEBUG +time_t debug_expired_reply_ttl_calc(time_t ttl, time_t ttl_add); +#define EXPIRED_REPLY_TTL_CALC(ttl, ttl_add) \ + debug_expired_reply_ttl_calc(ttl, ttl_add) +#else +#define EXPIRED_REPLY_TTL_CALC(ttl, ttl_add) \ + (SERVE_EXPIRED_REPLY_TTL < (ttl) - (ttl_add) ? \ + SERVE_EXPIRED_REPLY_TTL : (ttl) - (ttl_add)) +#endif + +/** Update the reply_info TTL from an RRSet's TTL, essentially keeping the TTL + * sane with all the (progressively added) rrsets to the message */ +#define UPDATE_TTL_FROM_RRSET(ttl, rrsetttl) \ + ((ttl) = ((ttl) < (rrsetttl)) ? (ttl) : (rrsetttl)) + +/** Check if TTL is expired. 0 TTL is considered expired. + * Used mainly to identify parts of the code that do this comparison. */ +#define TTL_IS_EXPIRED(ttl, now) ((ttl) <= (now)) + /** * Data stored in scratch pad memory during parsing. * Stores the data that will enter into the msgreply and packet result. |