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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/msgencode.c
+4 -2
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@@ -480,7 +480,8 @@ packed_rrset_encode(struct ub_packed_rrset_key* key, sldns_buffer* pkt,
sldns_buffer_write(pkt, &key->rk.type, 2);
sldns_buffer_write(pkt, &key->rk.rrset_class, 2);
if(data->rr_ttl[j] < timenow)
sldns_buffer_write_u32(pkt, 0);
sldns_buffer_write_u32(pkt,
SERVE_EXPIRED?SERVE_EXPIRED_REPLY_TTL:0);
else sldns_buffer_write_u32(pkt,
data->rr_ttl[j]-timenow);
if(c) {
@@ -517,7 +518,8 @@ packed_rrset_encode(struct ub_packed_rrset_key* key, sldns_buffer* pkt,
sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_RRSIG);
sldns_buffer_write(pkt, &key->rk.rrset_class, 2);
if(data->rr_ttl[i] < timenow)
sldns_buffer_write_u32(pkt, 0);
sldns_buffer_write_u32(pkt,
SERVE_EXPIRED?SERVE_EXPIRED_REPLY_TTL:0);
else sldns_buffer_write_u32(pkt,
data->rr_ttl[i]-timenow);
/* rrsig rdata cannot be compressed, perform 100+ byte