return 1;
}
+int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *soa = NULL;
+
+ soa = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SOA, name);
+ if (!soa)
+ return -ENOMEM;
+
+ soa->ttl = ttl;
+
+ soa->soa.mname = strdup(name);
+ if (!soa->soa.mname)
+ return -ENOMEM;
+
+ soa->soa.rname = strappend("root.", name);
+ if (!soa->soa.rname)
+ return -ENOMEM;
+
+ soa->soa.serial = 1;
+ soa->soa.refresh = 1;
+ soa->soa.retry = 1;
+ soa->soa.expire = 1;
+ soa->soa.minimum = ttl;
+
+ return dns_answer_add(a, soa);
+}
+
int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) {
unsigned i;
int r;
assert(key);
assert(ret);
+ /* For a SOA record we can never find a matching SOA record */
+ if (key->type == DNS_TYPE_SOA)
+ return 0;
+
for (i = 0; i < a->n_rrs; i++) {
if (a->rrs[i]->key->class != DNS_CLASS_IN)
return k;
}
+
+void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
+ DnsResourceRecord **rrs;
+ unsigned i, start, end;
+ assert(a);
+
+ if (a->n_rrs <= 1)
+ return;
+
+ start = 0;
+ end = a->n_rrs-1;
+
+ /* RFC 4795, Section 2.6 suggests we should order entries
+ * depending on whether the sender is a link-local address. */
+
+ rrs = newa(DnsResourceRecord*, a->n_rrs);
+ for (i = 0; i < a->n_rrs; i++) {
+
+ if (a->rrs[i]->key->class == DNS_CLASS_IN &&
+ ((a->rrs[i]->key->type == DNS_TYPE_A && in_addr_is_link_local(AF_INET, (union in_addr_union*) &a->rrs[i]->a.in_addr) != prefer_link_local) ||
+ (a->rrs[i]->key->type == DNS_TYPE_AAAA && in_addr_is_link_local(AF_INET6, (union in_addr_union*) &a->rrs[i]->aaaa.in6_addr) != prefer_link_local)))
+ /* Order address records that are are not preferred to the end of the array */
+ rrs[end--] = a->rrs[i];
+ else
+ /* Order all other records to the beginning of the array */
+ rrs[start++] = a->rrs[i];
+ }
+
+ assert(start == end+1);
+ memcpy(a->rrs, rrs, sizeof(DnsResourceRecord*) * a->n_rrs);
+}