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git.ipfire.org Git - thirdparty/systemd.git/blob - src/resolve/resolved-dns-question.c
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 "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
) {
76 for (i
= 0; i
< q
->n_keys
; i
++) {
77 r
= dns_resource_key_equal(q
->keys
[i
], key
);
84 if (q
->n_keys
>= q
->n_allocated
)
87 q
->keys
[q
->n_keys
++] = dns_resource_key_ref(key
);
91 int dns_question_matches_rr(DnsQuestion
*q
, DnsResourceRecord
*rr
) {
100 for (i
= 0; i
< q
->n_keys
; i
++) {
101 r
= dns_resource_key_match_rr(q
->keys
[i
], rr
);
109 int dns_question_matches_cname(DnsQuestion
*q
, DnsResourceRecord
*rr
) {
118 for (i
= 0; i
< q
->n_keys
; i
++) {
119 r
= dns_resource_key_match_cname(q
->keys
[i
], rr
);
127 int dns_question_is_valid(DnsQuestion
*q
) {
138 if (q
->n_keys
> 65535)
141 name
= DNS_RESOURCE_KEY_NAME(q
->keys
[0]);
145 /* Check that all keys in this question bear the same name */
146 for (i
= 1; i
< q
->n_keys
; i
++) {
149 r
= dns_name_equal(DNS_RESOURCE_KEY_NAME(q
->keys
[i
]), name
);
157 int dns_question_is_superset(DnsQuestion
*q
, DnsQuestion
*other
) {
161 /* Checks if all keys in "other" are also contained in "q" */
166 for (j
= 0; j
< other
->n_keys
; j
++) {
167 DnsResourceKey
*b
= other
->keys
[j
];
174 for (i
= 0; i
< q
->n_keys
; i
++) {
175 DnsResourceKey
*a
= q
->keys
[i
];
177 r
= dns_name_equal(DNS_RESOURCE_KEY_NAME(a
), DNS_RESOURCE_KEY_NAME(b
));
184 if (a
->class != b
->class && a
->class != DNS_CLASS_ANY
)
187 if (a
->type
!= b
->type
&& a
->type
!= DNS_TYPE_ANY
)
201 int dns_question_contains(DnsQuestion
*a
, DnsResourceKey
*k
) {
210 for (j
= 0; j
< a
->n_keys
; j
++) {
211 r
= dns_resource_key_equal(a
->keys
[j
], k
);
219 int dns_question_is_equal(DnsQuestion
*a
, DnsQuestion
*b
) {
224 return !b
|| b
->n_keys
== 0;
226 return a
->n_keys
== 0;
228 /* Checks if all keys in a are also contained b, and vice versa */
230 for (j
= 0; j
< a
->n_keys
; j
++) {
231 r
= dns_question_contains(b
, a
->keys
[j
]);
236 for (j
= 0; j
< b
->n_keys
; j
++) {
237 r
= dns_question_contains(a
, b
->keys
[j
]);
245 int dns_question_cname_redirect(DnsQuestion
*q
, const char *name
, DnsQuestion
**ret
) {
246 _cleanup_(dns_question_unrefp
) DnsQuestion
*n
= NULL
;
255 n
= dns_question_new(0);
264 for (i
= 0; i
< q
->n_keys
; i
++) {
265 r
= dns_name_equal(DNS_RESOURCE_KEY_NAME(q
->keys
[i
]), name
);
276 /* Shortcut, the names are already right */
277 *ret
= dns_question_ref(q
);
281 n
= dns_question_new(q
->n_keys
);
285 /* Create a new question, and patch in the new name */
286 for (i
= 0; i
< q
->n_keys
; i
++) {
287 _cleanup_(dns_resource_key_unrefp
) DnsResourceKey
*k
= NULL
;
289 k
= dns_resource_key_new(q
->keys
[i
]->class, q
->keys
[i
]->type
, name
);
293 r
= dns_question_add(n
, k
);