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Diffstat (limited to 'src/resolve/resolved-dns-cache.c')
-rw-r--r--src/resolve/resolved-dns-cache.c48
1 files changed, 28 insertions, 20 deletions
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index a2cbdd8259..794d587d4d 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -548,7 +548,7 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, D
* much, after all this is just a cache */
i = hashmap_get(c->by_key, k);
- if (i || IN_SET(k->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME, DNS_TYPE_NSEC))
+ if (i)
return i;
n = DNS_RESOURCE_KEY_NAME(k);
@@ -559,31 +559,39 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, D
if (i && i->type == DNS_CACHE_NXDOMAIN)
return i;
- /* Check if we have an NSEC record instead for the name. */
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_NSEC, n));
- if (i)
- return i;
+ /* The following record types should never be redirected. See
+ * <https://tools.ietf.org/html/rfc4035#section-2.5>. */
+ if (!IN_SET(k->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME,
+ DNS_TYPE_NSEC3, DNS_TYPE_NSEC, DNS_TYPE_RRSIG,
+ DNS_TYPE_NXT, DNS_TYPE_SIG, DNS_TYPE_KEY)) {
+ /* Check if we have a CNAME record instead */
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_CNAME, n));
+ if (i)
+ return i;
- /* Check if we have a CNAME record instead */
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_CNAME, n));
- if (i)
- return i;
+ /* OK, let's look for cached DNAME records. */
+ for (;;) {
+ char label[DNS_LABEL_MAX];
- /* OK, let's look for cached DNAME records. */
- for (;;) {
- char label[DNS_LABEL_MAX];
+ if (isempty(n))
+ return NULL;
+
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_DNAME, n));
+ if (i)
+ return i;
- if (isempty(n))
- return NULL;
+ /* Jump one label ahead */
+ r = dns_label_unescape(&n, label, sizeof(label));
+ if (r <= 0)
+ return NULL;
+ }
+ }
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_DNAME, n));
+ if (k-> type != DNS_TYPE_NSEC) {
+ /* Check if we have an NSEC record instead for the name. */
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_NSEC, n));
if (i)
return i;
-
- /* Jump one label ahead */
- r = dns_label_unescape(&n, label, sizeof(label));
- if (r <= 0)
- return NULL;
}
return NULL;