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faa133f3 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
b5efdb8a | 22 | #include "alloc-util.h" |
4ad7f276 | 23 | #include "dns-domain.h" |
b5efdb8a | 24 | #include "resolved-dns-question.h" |
faa133f3 LP |
25 | |
26 | DnsQuestion *dns_question_new(unsigned n) { | |
27 | DnsQuestion *q; | |
28 | ||
29 | assert(n > 0); | |
30 | ||
31 | q = malloc0(offsetof(DnsQuestion, keys) + sizeof(DnsResourceKey*) * n); | |
32 | if (!q) | |
33 | return NULL; | |
34 | ||
35 | q->n_ref = 1; | |
36 | q->n_allocated = n; | |
37 | ||
38 | return q; | |
39 | } | |
40 | ||
41 | DnsQuestion *dns_question_ref(DnsQuestion *q) { | |
42 | if (!q) | |
43 | return NULL; | |
44 | ||
45 | assert(q->n_ref > 0); | |
46 | q->n_ref++; | |
47 | return q; | |
48 | } | |
49 | ||
50 | DnsQuestion *dns_question_unref(DnsQuestion *q) { | |
51 | if (!q) | |
52 | return NULL; | |
53 | ||
54 | assert(q->n_ref > 0); | |
55 | ||
56 | if (q->n_ref == 1) { | |
57 | unsigned i; | |
58 | ||
59 | for (i = 0; i < q->n_keys; i++) | |
60 | dns_resource_key_unref(q->keys[i]); | |
61 | free(q); | |
62 | } else | |
63 | q->n_ref--; | |
64 | ||
65 | return NULL; | |
66 | } | |
67 | ||
68 | int dns_question_add(DnsQuestion *q, DnsResourceKey *key) { | |
7e8e0422 LP |
69 | unsigned i; |
70 | int r; | |
71 | ||
faa133f3 LP |
72 | assert(key); |
73 | ||
8013e860 LP |
74 | if (!q) |
75 | return -ENOSPC; | |
76 | ||
7e8e0422 LP |
77 | for (i = 0; i < q->n_keys; i++) { |
78 | r = dns_resource_key_equal(q->keys[i], key); | |
79 | if (r < 0) | |
80 | return r; | |
81 | if (r > 0) | |
82 | return 0; | |
83 | } | |
84 | ||
faa133f3 LP |
85 | if (q->n_keys >= q->n_allocated) |
86 | return -ENOSPC; | |
87 | ||
88 | q->keys[q->n_keys++] = dns_resource_key_ref(key); | |
89 | return 0; | |
90 | } | |
91 | ||
801ad6a6 | 92 | int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
faa133f3 LP |
93 | unsigned i; |
94 | int r; | |
95 | ||
faa133f3 LP |
96 | assert(rr); |
97 | ||
8013e860 LP |
98 | if (!q) |
99 | return 0; | |
100 | ||
faa133f3 | 101 | for (i = 0; i < q->n_keys; i++) { |
801ad6a6 | 102 | r = dns_resource_key_match_rr(q->keys[i], rr, search_domain); |
faa133f3 LP |
103 | if (r != 0) |
104 | return r; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
801ad6a6 | 110 | int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
faa133f3 LP |
111 | unsigned i; |
112 | int r; | |
113 | ||
faa133f3 LP |
114 | assert(rr); |
115 | ||
8013e860 LP |
116 | if (!q) |
117 | return 0; | |
118 | ||
faa133f3 | 119 | for (i = 0; i < q->n_keys; i++) { |
5d27351f | 120 | r = dns_resource_key_match_cname_or_dname(q->keys[i], rr->key, search_domain); |
faa133f3 LP |
121 | if (r != 0) |
122 | return r; | |
123 | } | |
124 | ||
34b9656f | 125 | return 0; |
faa133f3 LP |
126 | } |
127 | ||
703e4f5e | 128 | int dns_question_is_valid_for_query(DnsQuestion *q) { |
faa133f3 LP |
129 | const char *name; |
130 | unsigned i; | |
131 | int r; | |
132 | ||
8013e860 LP |
133 | if (!q) |
134 | return 0; | |
faa133f3 LP |
135 | |
136 | if (q->n_keys <= 0) | |
137 | return 0; | |
138 | ||
139 | if (q->n_keys > 65535) | |
140 | return 0; | |
141 | ||
142 | name = DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
143 | if (!name) | |
144 | return 0; | |
145 | ||
146 | /* Check that all keys in this question bear the same name */ | |
147 | for (i = 1; i < q->n_keys; i++) { | |
34b9656f LP |
148 | assert(q->keys[i]); |
149 | ||
faa133f3 LP |
150 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name); |
151 | if (r <= 0) | |
152 | return r; | |
153 | } | |
154 | ||
155 | return 1; | |
156 | } | |
157 | ||
1086182d LP |
158 | int dns_question_contains(DnsQuestion *a, DnsResourceKey *k) { |
159 | unsigned j; | |
160 | int r; | |
161 | ||
1086182d LP |
162 | assert(k); |
163 | ||
8013e860 LP |
164 | if (!a) |
165 | return 0; | |
166 | ||
1086182d LP |
167 | for (j = 0; j < a->n_keys; j++) { |
168 | r = dns_resource_key_equal(a->keys[j], k); | |
169 | if (r != 0) | |
170 | return r; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) { | |
177 | unsigned j; | |
178 | int r; | |
179 | ||
8013e860 LP |
180 | if (!a) |
181 | return !b || b->n_keys == 0; | |
182 | if (!b) | |
183 | return a->n_keys == 0; | |
1086182d LP |
184 | |
185 | /* Checks if all keys in a are also contained b, and vice versa */ | |
186 | ||
187 | for (j = 0; j < a->n_keys; j++) { | |
188 | r = dns_question_contains(b, a->keys[j]); | |
189 | if (r <= 0) | |
190 | return r; | |
191 | } | |
192 | ||
193 | for (j = 0; j < b->n_keys; j++) { | |
194 | r = dns_question_contains(a, b->keys[j]); | |
195 | if (r <= 0) | |
196 | return r; | |
197 | } | |
198 | ||
199 | return 1; | |
200 | } | |
201 | ||
36d9205d | 202 | int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret) { |
faa133f3 LP |
203 | _cleanup_(dns_question_unrefp) DnsQuestion *n = NULL; |
204 | bool same = true; | |
205 | unsigned i; | |
206 | int r; | |
207 | ||
36d9205d | 208 | assert(cname); |
faa133f3 | 209 | assert(ret); |
58db254a | 210 | assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); |
faa133f3 | 211 | |
8013e860 LP |
212 | if (!q) { |
213 | n = dns_question_new(0); | |
214 | if (!n) | |
215 | return -ENOMEM; | |
216 | ||
217 | *ret = n; | |
218 | n = 0; | |
219 | return 0; | |
220 | } | |
221 | ||
faa133f3 | 222 | for (i = 0; i < q->n_keys; i++) { |
58db254a LP |
223 | _cleanup_free_ char *destination = NULL; |
224 | const char *d; | |
225 | ||
226 | if (cname->key->type == DNS_TYPE_CNAME) | |
227 | d = cname->cname.name; | |
228 | else { | |
229 | r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(q->keys[i]), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination); | |
230 | if (r < 0) | |
231 | return r; | |
232 | if (r == 0) | |
233 | continue; | |
234 | ||
235 | d = destination; | |
236 | } | |
237 | ||
238 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), d); | |
faa133f3 LP |
239 | if (r < 0) |
240 | return r; | |
241 | ||
242 | if (r == 0) { | |
243 | same = false; | |
244 | break; | |
245 | } | |
246 | } | |
247 | ||
248 | if (same) { | |
249 | /* Shortcut, the names are already right */ | |
250 | *ret = dns_question_ref(q); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | n = dns_question_new(q->n_keys); | |
255 | if (!n) | |
256 | return -ENOMEM; | |
257 | ||
258 | /* Create a new question, and patch in the new name */ | |
34b9656f | 259 | for (i = 0; i < q->n_keys; i++) { |
faa133f3 LP |
260 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL; |
261 | ||
36d9205d | 262 | k = dns_resource_key_new_redirect(q->keys[i], cname); |
faa133f3 LP |
263 | if (!k) |
264 | return -ENOMEM; | |
265 | ||
266 | r = dns_question_add(n, k); | |
267 | if (r < 0) | |
268 | return r; | |
269 | } | |
270 | ||
271 | *ret = n; | |
272 | n = NULL; | |
273 | ||
274 | return 1; | |
275 | } | |
45ec7efb | 276 | |
703e4f5e LP |
277 | const char *dns_question_first_name(DnsQuestion *q) { |
278 | ||
279 | if (!q) | |
280 | return NULL; | |
45ec7efb LP |
281 | |
282 | if (q->n_keys < 1) | |
283 | return NULL; | |
284 | ||
285 | return DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
286 | } | |
287 | ||
288 | int dns_question_new_address(DnsQuestion **ret, int family, const char *name) { | |
289 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
290 | int r; | |
291 | ||
292 | assert(ret); | |
293 | assert(name); | |
294 | ||
295 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
296 | return -EAFNOSUPPORT; | |
297 | ||
298 | q = dns_question_new(family == AF_UNSPEC ? 2 : 1); | |
299 | if (!q) | |
300 | return -ENOMEM; | |
301 | ||
302 | if (family != AF_INET6) { | |
303 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
304 | ||
305 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, name); | |
306 | if (!key) | |
307 | return -ENOMEM; | |
308 | ||
309 | r = dns_question_add(q, key); | |
310 | if (r < 0) | |
311 | return r; | |
312 | } | |
313 | ||
314 | if (family != AF_INET) { | |
315 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
316 | ||
317 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
318 | if (!key) | |
319 | return -ENOMEM; | |
320 | ||
321 | r = dns_question_add(q, key); | |
322 | if (r < 0) | |
323 | return r; | |
324 | } | |
325 | ||
326 | *ret = q; | |
327 | q = NULL; | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | int dns_question_new_reverse(DnsQuestion **ret, int family, const union in_addr_union *a) { | |
333 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
334 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
335 | _cleanup_free_ char *reverse = NULL; | |
336 | int r; | |
337 | ||
338 | assert(ret); | |
339 | assert(a); | |
340 | ||
341 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
342 | return -EAFNOSUPPORT; | |
343 | ||
344 | r = dns_name_reverse(family, a, &reverse); | |
345 | if (r < 0) | |
346 | return r; | |
347 | ||
348 | q = dns_question_new(1); | |
349 | if (!q) | |
350 | return -ENOMEM; | |
351 | ||
352 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse); | |
353 | if (!key) | |
354 | return -ENOMEM; | |
355 | ||
356 | reverse = NULL; | |
357 | ||
358 | r = dns_question_add(q, key); | |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | *ret = q; | |
363 | q = NULL; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | int dns_question_new_service(DnsQuestion **ret, const char *name, bool with_txt) { | |
369 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
370 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
371 | int r; | |
372 | ||
373 | assert(ret); | |
374 | assert(name); | |
375 | ||
376 | q = dns_question_new(1 + with_txt); | |
377 | if (!q) | |
378 | return -ENOMEM; | |
379 | ||
380 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_SRV, name); | |
381 | if (!key) | |
382 | return -ENOMEM; | |
383 | ||
384 | r = dns_question_add(q, key); | |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
388 | if (with_txt) { | |
389 | dns_resource_key_unref(key); | |
390 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_TXT, name); | |
391 | if (!key) | |
392 | return -ENOMEM; | |
393 | ||
394 | r = dns_question_add(q, key); | |
395 | if (r < 0) | |
396 | return r; | |
397 | } | |
398 | ||
399 | *ret = q; | |
400 | q = NULL; | |
401 | ||
402 | return 0; | |
403 | } |