1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include "resolved-dns-question.h"
23 #include "resolved-dns-domain.h"
25 DnsQuestion *dns_question_new(unsigned n) {
30 q = malloc0(offsetof(DnsQuestion, keys) + sizeof(DnsResourceKey*) * n);
40 DnsQuestion *dns_question_ref(DnsQuestion *q) {
49 DnsQuestion *dns_question_unref(DnsQuestion *q) {
58 for (i = 0; i < q->n_keys; i++)
59 dns_resource_key_unref(q->keys[i]);
67 int dns_question_add(DnsQuestion *q, DnsResourceKey *key) {
71 if (q->n_keys >= q->n_allocated)
74 q->keys[q->n_keys++] = dns_resource_key_ref(key);
78 int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr) {
85 for (i = 0; i < q->n_keys; i++) {
86 r = dns_resource_key_match_rr(q->keys[i], rr);
94 int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr) {
101 for (i = 0; i < q->n_keys; i++) {
102 r = dns_resource_key_match_cname(q->keys[i], rr);
110 int dns_question_is_valid(DnsQuestion *q) {
120 if (q->n_keys > 65535)
123 name = DNS_RESOURCE_KEY_NAME(q->keys[0]);
127 /* Check that all keys in this question bear the same name */
128 for (i = 1; i < q->n_keys; i++) {
129 r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name);
137 int dns_question_is_superset(DnsQuestion *q, DnsQuestion *other) {
144 /* Checks if all keys in "other" are also contained in "q" */
146 for (j = 0; j < other->n_keys; j++) {
147 DnsResourceKey *b = other->keys[j];
151 for (i = 0; i < q->n_keys; i++) {
152 DnsResourceKey *a = q->keys[i];
154 r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b));
161 if (a->class != b->class && a->class != DNS_CLASS_ANY)
164 if (a->type != b->type && a->type != DNS_TYPE_ANY)
178 int dns_question_cname_redirect(DnsQuestion *q, const char *name, DnsQuestion **ret) {
179 _cleanup_(dns_question_unrefp) DnsQuestion *n = NULL;
188 for (i = 0; i < q->n_keys; i++) {
189 r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name);
200 /* Shortcut, the names are already right */
201 *ret = dns_question_ref(q);
205 n = dns_question_new(q->n_keys);
209 /* Create a new question, and patch in the new name */
210 for (n->n_keys = 0; n->n_keys < q->n_keys; n->n_keys++) {
211 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL;
213 k = dns_resource_key_new(q->keys[i]->class, q->keys[i]->type, name);
217 r = dns_question_add(n, k);