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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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4
doc/Changelog
View File

@ -1,3 +1,7 @@
12 May 2017: Wouter
- Adjust servfail by iterator to not store in cache when serve-expired
is enabled, to avoid overwriting useful information there.
9 May 2017: Ralph
- Add 'c' to getopt() in testbound.
- iana portlist update

16
iterator/iterator.c
View File

@ -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);

2
services/cache/dns.c vendored
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@ -182,7 +182,7 @@ addr_to_additional(struct ub_packed_rrset_key* rrset, struct regional* region,
}
/** lookup message in message cache */
static struct msgreply_entry*
struct msgreply_entry*
msg_cache_lookup(struct module_env* env, uint8_t* qname, size_t qnamelen,
uint16_t qtype, uint16_t qclass, uint16_t flags, time_t now, int wr)
{

6
services/cache/dns.h vendored
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@ -208,4 +208,10 @@ int dns_msg_authadd(struct dns_msg* msg, struct regional* region,
int dns_cache_prefetch_adjust(struct module_env* env, struct query_info* qinfo,
time_t adjust, uint16_t flags);
/** lookup message in message cache
* the returned nonNULL entry is locked and has to be unlocked by the caller */
struct msgreply_entry* msg_cache_lookup(struct module_env* env,
uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
uint16_t flags, time_t now, int wr);
#endif /* SERVICES_CACHE_DNS_H */