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- Allow TTL refresh of expired error responses.

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This commit is contained in:
George Thessalonikefs 2023-02-09 10:47:46 +01:00
parent a8977df4d9
commit 87a8c80fcb
1 changed files with 20 additions and 5 deletions
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25
iterator/iterator.c
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@ -320,20 +320,35 @@ error_response_cache(struct module_qstate* qstate, int id, int rcode)
if((msg=msg_cache_lookup(qstate->env,
qstate->qinfo.qname, qstate->qinfo.qname_len,
qstate->qinfo.qtype, qstate->qinfo.qclass,
qstate->query_flags, 0,
qstate->env->cfg->serve_expired_ttl_reset))
!= NULL) {
qstate->query_flags, 0, 1)) != NULL) {
struct reply_info* rep =
(struct reply_info*)msg->entry.data;
if(qstate->env->cfg->serve_expired_ttl_reset) {
struct reply_info* rep =
(struct reply_info*)msg->entry.data;
if(rep && *qstate->env->now +
qstate->env->cfg->serve_expired_ttl >
rep->serve_expired_ttl) {
verbose(VERB_ALGO, "reset "
"serve-expired-ttl for "
"error response in "
"cache");
rep->serve_expired_ttl =
*qstate->env->now +
qstate->env->cfg->serve_expired_ttl;
}
}
/* if the expired record is an error response
* refresh for another NORR_TTL */
if(rep && *qstate->env->now > rep->ttl &&
(FLAGS_GET_RCODE(rep->flags) !=
LDNS_RCODE_NOERROR &&
FLAGS_GET_RCODE(rep->flags) !=
LDNS_RCODE_NXDOMAIN &&
FLAGS_GET_RCODE(rep->flags) !=
LDNS_RCODE_YXDOMAIN)) {
verbose(VERB_ALGO, "refresh TTL for "
"error response in cache");
rep->ttl = *qstate->env->now + NORR_TTL;
}
lock_rw_unlock(&msg->entry.lock);
return error_response(qstate, id, rcode);
}