resolved: rr - introduce dns_resource_key_new_redirect()

Takes a key and CNAME RR and returns the canonical RR of the right
type. Make use of this in dns_question_redirect().

1 files changed, 7 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 42ccd05578..fd2f53f40b 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -54,6 +54,13 @@ DnsResourceKey* dns_resource_key_new_cname(const DnsResourceKey *key) {
         return dns_resource_key_new(key->class, DNS_TYPE_CNAME, DNS_RESOURCE_KEY_NAME(key));
 }
 
+DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname) {
+        assert(key);
+        assert(cname);
+
+        return dns_resource_key_new(key->class, key->type, cname->cname.name);
+}
+
 DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) {
         DnsResourceKey *k;