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- Adjust servfail by iterator to not store in cache when serve-expired

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is enabled, to avoid overwriting useful information there.


git-svn-id: file:///svn/unbound/trunk@4153 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards
2017-05-12 12:16:41 +00:00
parent ce54c45394
commit 893159454f
4 changed files with 27 additions and 1 deletions
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iterator/iterator.c
+16
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@@ -288,6 +288,22 @@ error_response_cache(struct module_qstate* qstate, int id, int rcode)
return error_response(qstate, id, rcode);
/* if that fails (not in cache), fall through to store err */
}
if(qstate->env->cfg->serve_expired) {
/* if serving expired contents, and such content is
* already available, don't overwrite this servfail */
struct msgreply_entry* msg;
if((msg=msg_cache_lookup(qstate->env,
qstate->qinfo.qname, qstate->qinfo.qname_len,
qstate->qinfo.qtype, qstate->qinfo.qclass,
qstate->query_flags, 0, 0))
!= NULL) {
lock_rw_unlock(&msg->entry.lock);
return error_response(qstate, id, rcode);
}
/* serving expired contents, but nothing is cached
* at all, so the servfail cache entry is useful
* (stops waste of time on this servfail NORR_TTL) */
}
memset(&err, 0, sizeof(err));
err.flags = (uint16_t)(BIT_QR | BIT_RA);
FLAGS_SET_RCODE(err.flags, rcode);