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set eresult based on the type in ncache_adderesult()

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when the caching of a negative record failed because of the
presence of a positive one, ncache_adderesult() could override
this to ISC_R_SUCCESS. this could cause CNAME and DNAME responses
to be handled incorrectly.  ncache_adderesult() now sets the result
code correctly in such cases.
This commit is contained in:
Evan Hunt
2025-02-25 14:41:41 -08:00
parent a102e504c3
commit 1edbbc32b4
1 changed files with 14 additions and 8 deletions
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22
lib/dns/resolver.c
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@@ -6422,15 +6422,21 @@ ncache_adderesult(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
}
} else {
/*
* Either we don't care about the nature of the
* cache rdataset (because no fetch is
* interested in the outcome), or the cache
* rdataset is not a negative cache entry.
* Whichever case it is, we can return success.
*
* XXXRTH There's a CNAME/DNAME problem here.
* The attempt to add a negative cache entry
* was rejected. Set *eresultp to reflect
* the type of the dataset being returned.
*/
*eresultp = ISC_R_SUCCESS;
switch (ardataset->type) {
case dns_rdatatype_cname:
*eresultp = DNS_R_CNAME;
break;
case dns_rdatatype_dname:
*eresultp = DNS_R_DNAME;
break;
default:
*eresultp = ISC_R_SUCCESS;
break;
}
}
result = ISC_R_SUCCESS;
}