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-rw-r--r--src/resolve/resolved-dns-cache.c44
-rw-r--r--src/resolve/resolved-dns-question.c18
-rw-r--r--src/resolve/resolved-dns-rr.c33
-rw-r--r--src/resolve/resolved-dns-rr.h1
4 files changed, 84 insertions, 12 deletions
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index 04f64022e0..d963ce6e00 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -20,8 +20,10 @@
***/
#include "alloc-util.h"
+#include "dns-domain.h"
#include "resolved-dns-cache.h"
#include "resolved-dns-packet.h"
+#include "string-util.h"
/* Never cache more than 1K entries */
#define CACHE_MAX 1024
@@ -521,25 +523,53 @@ fail:
static DnsCacheItem *dns_cache_get_by_key_follow_cname(DnsCache *c, DnsResourceKey *k) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *cname_key = NULL;
- DnsCacheItem *i, *j;
+ DnsCacheItem *i;
+ const char *n;
+ int r;
assert(c);
assert(k);
+ /* If we hit some OOM error, or suchlike, we don't care too
+ * much, after all this is just a cache */
+
i = hashmap_get(c->by_key, k);
- if (i || k->type == DNS_TYPE_CNAME)
+ if (i || k->type == DNS_TYPE_CNAME || k->type == DNS_TYPE_DNAME)
return i;
- /* check if we have a CNAME record instead */
+ /* Check if we have a CNAME record instead */
cname_key = dns_resource_key_new_cname(k);
if (!cname_key)
return NULL;
- j = hashmap_get(c->by_key, cname_key);
- if (j)
- return j;
+ i = hashmap_get(c->by_key, cname_key);
+ if (i)
+ return i;
+
+ /* OK, let's look for cached DNAME records. */
+ n = DNS_RESOURCE_KEY_NAME(k);
+ for (;;) {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *dname_key = NULL;
+ char label[DNS_LABEL_MAX];
+
+ if (isempty(n))
+ return NULL;
- return i;
+ dname_key = dns_resource_key_new(k->class, DNS_TYPE_DNAME, n);
+ if (!dname_key)
+ return NULL;
+
+ i = hashmap_get(c->by_key, dname_key);
+ if (i)
+ return i;
+
+ /* Jump one label ahead */
+ r = dns_label_unescape(&n, label, sizeof(label));
+ if (r <= 0)
+ return NULL;
+ }
+
+ return NULL;
}
int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **ret) {
diff --git a/src/resolve/resolved-dns-question.c b/src/resolve/resolved-dns-question.c
index 75f2ed6042..9fb3038381 100644
--- a/src/resolve/resolved-dns-question.c
+++ b/src/resolve/resolved-dns-question.c
@@ -207,6 +207,7 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
assert(cname);
assert(ret);
+ assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
if (!q) {
n = dns_question_new(0);
@@ -219,7 +220,22 @@ int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname,
}
for (i = 0; i < q->n_keys; i++) {
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), cname->cname.name);
+ _cleanup_free_ char *destination = NULL;
+ const char *d;
+
+ if (cname->key->type == DNS_TYPE_CNAME)
+ d = cname->cname.name;
+ else {
+ r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(q->keys[i]), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ d = destination;
+ }
+
+ r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), d);
if (r < 0)
return r;
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 636e07dea9..9b264900fc 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -57,10 +57,33 @@ DnsResourceKey* dns_resource_key_new_cname(const DnsResourceKey *key) {
}
DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) {
+ int r;
+
assert(key);
assert(cname);
- return dns_resource_key_new(key->class, key->type, cname->cname.name);
+ assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME));
+
+ if (cname->key->type == DNS_TYPE_CNAME)
+ return dns_resource_key_new(key->class, key->type, cname->cname.name);
+ else {
+ DnsResourceKey *k;
+ char *destination = NULL;
+
+ r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination);
+ if (r < 0)
+ return NULL;
+ if (r == 0)
+ return dns_resource_key_ref((DnsResourceKey*) key);
+
+ k = dns_resource_key_new_consume(key->class, key->type, destination);
+ if (!k) {
+ free(destination);
+ return NULL;
+ }
+
+ return k;
+ }
}
DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
@@ -142,10 +165,12 @@ int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRec
if (rr->key->class != key->class && key->class != DNS_CLASS_ANY)
return 0;
- if (rr->key->type != DNS_TYPE_CNAME)
+ if (rr->key->type == DNS_TYPE_CNAME)
+ return dns_name_equal(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(rr->key));
+ else if (rr->key->type == DNS_TYPE_DNAME)
+ return dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(rr->key));
+ else
return 0;
-
- return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key));
}
static void dns_resource_key_hash_func(const void *i, struct siphash *state) {
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index c02f2ec00f..c1601fb694 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -186,6 +186,7 @@ static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
DnsResourceKey* dns_resource_key_new_cname(const DnsResourceKey *key);
+DnsResourceKey* dns_resource_key_new_dname(const DnsResourceKey *key);
DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname);
DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name);
DnsResourceKey* dns_resource_key_ref(DnsResourceKey *key);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-24 11:52:35 +0000