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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" |
0f7091e6 | 24 | #include "dns-type.h" |
b5efdb8a | 25 | #include "resolved-dns-question.h" |
faa133f3 LP |
26 | |
27 | DnsQuestion *dns_question_new(unsigned n) { | |
28 | DnsQuestion *q; | |
29 | ||
30 | assert(n > 0); | |
31 | ||
32 | q = malloc0(offsetof(DnsQuestion, keys) + sizeof(DnsResourceKey*) * n); | |
33 | if (!q) | |
34 | return NULL; | |
35 | ||
36 | q->n_ref = 1; | |
37 | q->n_allocated = n; | |
38 | ||
39 | return q; | |
40 | } | |
41 | ||
42 | DnsQuestion *dns_question_ref(DnsQuestion *q) { | |
43 | if (!q) | |
44 | return NULL; | |
45 | ||
46 | assert(q->n_ref > 0); | |
47 | q->n_ref++; | |
48 | return q; | |
49 | } | |
50 | ||
51 | DnsQuestion *dns_question_unref(DnsQuestion *q) { | |
52 | if (!q) | |
53 | return NULL; | |
54 | ||
55 | assert(q->n_ref > 0); | |
56 | ||
57 | if (q->n_ref == 1) { | |
58 | unsigned i; | |
59 | ||
60 | for (i = 0; i < q->n_keys; i++) | |
61 | dns_resource_key_unref(q->keys[i]); | |
62 | free(q); | |
63 | } else | |
64 | q->n_ref--; | |
65 | ||
66 | return NULL; | |
67 | } | |
68 | ||
69 | int dns_question_add(DnsQuestion *q, DnsResourceKey *key) { | |
7e8e0422 LP |
70 | unsigned i; |
71 | int r; | |
72 | ||
faa133f3 LP |
73 | assert(key); |
74 | ||
8013e860 LP |
75 | if (!q) |
76 | return -ENOSPC; | |
77 | ||
7e8e0422 LP |
78 | for (i = 0; i < q->n_keys; i++) { |
79 | r = dns_resource_key_equal(q->keys[i], key); | |
80 | if (r < 0) | |
81 | return r; | |
82 | if (r > 0) | |
83 | return 0; | |
84 | } | |
85 | ||
faa133f3 LP |
86 | if (q->n_keys >= q->n_allocated) |
87 | return -ENOSPC; | |
88 | ||
89 | q->keys[q->n_keys++] = dns_resource_key_ref(key); | |
90 | return 0; | |
91 | } | |
92 | ||
801ad6a6 | 93 | int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
faa133f3 LP |
94 | unsigned i; |
95 | int r; | |
96 | ||
faa133f3 LP |
97 | assert(rr); |
98 | ||
8013e860 LP |
99 | if (!q) |
100 | return 0; | |
101 | ||
faa133f3 | 102 | for (i = 0; i < q->n_keys; i++) { |
801ad6a6 | 103 | r = dns_resource_key_match_rr(q->keys[i], rr, search_domain); |
faa133f3 LP |
104 | if (r != 0) |
105 | return r; | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
801ad6a6 | 111 | int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
faa133f3 LP |
112 | unsigned i; |
113 | int r; | |
114 | ||
faa133f3 LP |
115 | assert(rr); |
116 | ||
8013e860 LP |
117 | if (!q) |
118 | return 0; | |
119 | ||
faa133f3 | 120 | for (i = 0; i < q->n_keys; i++) { |
5d27351f | 121 | r = dns_resource_key_match_cname_or_dname(q->keys[i], rr->key, search_domain); |
faa133f3 LP |
122 | if (r != 0) |
123 | return r; | |
124 | } | |
125 | ||
34b9656f | 126 | return 0; |
faa133f3 LP |
127 | } |
128 | ||
703e4f5e | 129 | int dns_question_is_valid_for_query(DnsQuestion *q) { |
faa133f3 LP |
130 | const char *name; |
131 | unsigned i; | |
132 | int r; | |
133 | ||
8013e860 LP |
134 | if (!q) |
135 | return 0; | |
faa133f3 LP |
136 | |
137 | if (q->n_keys <= 0) | |
138 | return 0; | |
139 | ||
140 | if (q->n_keys > 65535) | |
141 | return 0; | |
142 | ||
143 | name = DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
144 | if (!name) | |
145 | return 0; | |
146 | ||
147 | /* Check that all keys in this question bear the same name */ | |
0f7091e6 | 148 | for (i = 0; i < q->n_keys; i++) { |
34b9656f LP |
149 | assert(q->keys[i]); |
150 | ||
0f7091e6 LP |
151 | if (i > 0) { |
152 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), name); | |
153 | if (r <= 0) | |
154 | return r; | |
155 | } | |
156 | ||
157 | if (!dns_type_is_valid_query(q->keys[i]->type)) | |
158 | return 0; | |
faa133f3 LP |
159 | } |
160 | ||
161 | return 1; | |
162 | } | |
163 | ||
6a21960c | 164 | int dns_question_contains(DnsQuestion *a, const DnsResourceKey *k) { |
1086182d LP |
165 | unsigned j; |
166 | int r; | |
167 | ||
1086182d LP |
168 | assert(k); |
169 | ||
8013e860 LP |
170 | if (!a) |
171 | return 0; | |
172 | ||
1086182d LP |
173 | for (j = 0; j < a->n_keys; j++) { |
174 | r = dns_resource_key_equal(a->keys[j], k); | |
175 | if (r != 0) | |
176 | return r; | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) { | |
183 | unsigned j; | |
184 | int r; | |
185 | ||
b6800689 LP |
186 | if (a == b) |
187 | return 1; | |
188 | ||
8013e860 LP |
189 | if (!a) |
190 | return !b || b->n_keys == 0; | |
191 | if (!b) | |
192 | return a->n_keys == 0; | |
1086182d LP |
193 | |
194 | /* Checks if all keys in a are also contained b, and vice versa */ | |
195 | ||
196 | for (j = 0; j < a->n_keys; j++) { | |
197 | r = dns_question_contains(b, a->keys[j]); | |
198 | if (r <= 0) | |
199 | return r; | |
200 | } | |
201 | ||
202 | for (j = 0; j < b->n_keys; j++) { | |
203 | r = dns_question_contains(a, b->keys[j]); | |
204 | if (r <= 0) | |
205 | return r; | |
206 | } | |
207 | ||
208 | return 1; | |
209 | } | |
210 | ||
36d9205d | 211 | int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret) { |
faa133f3 | 212 | _cleanup_(dns_question_unrefp) DnsQuestion *n = NULL; |
23b298bc | 213 | DnsResourceKey *key; |
faa133f3 | 214 | bool same = true; |
faa133f3 LP |
215 | int r; |
216 | ||
36d9205d | 217 | assert(cname); |
faa133f3 | 218 | assert(ret); |
58db254a | 219 | assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); |
faa133f3 | 220 | |
23b298bc LP |
221 | if (dns_question_size(q) <= 0) { |
222 | *ret = NULL; | |
8013e860 LP |
223 | return 0; |
224 | } | |
225 | ||
23b298bc | 226 | DNS_QUESTION_FOREACH(key, q) { |
58db254a LP |
227 | _cleanup_free_ char *destination = NULL; |
228 | const char *d; | |
229 | ||
230 | if (cname->key->type == DNS_TYPE_CNAME) | |
231 | d = cname->cname.name; | |
232 | else { | |
23b298bc | 233 | r = dns_name_change_suffix(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(cname->key), cname->dname.name, &destination); |
58db254a LP |
234 | if (r < 0) |
235 | return r; | |
236 | if (r == 0) | |
237 | continue; | |
238 | ||
239 | d = destination; | |
240 | } | |
241 | ||
23b298bc | 242 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(key), d); |
faa133f3 LP |
243 | if (r < 0) |
244 | return r; | |
245 | ||
246 | if (r == 0) { | |
247 | same = false; | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
23b298bc | 252 | /* Fully the same, indicate we didn't do a thing */ |
faa133f3 | 253 | if (same) { |
23b298bc | 254 | *ret = NULL; |
faa133f3 LP |
255 | return 0; |
256 | } | |
257 | ||
258 | n = dns_question_new(q->n_keys); | |
259 | if (!n) | |
260 | return -ENOMEM; | |
261 | ||
262 | /* Create a new question, and patch in the new name */ | |
23b298bc | 263 | DNS_QUESTION_FOREACH(key, q) { |
faa133f3 LP |
264 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL; |
265 | ||
23b298bc | 266 | k = dns_resource_key_new_redirect(key, cname); |
faa133f3 LP |
267 | if (!k) |
268 | return -ENOMEM; | |
269 | ||
270 | r = dns_question_add(n, k); | |
271 | if (r < 0) | |
272 | return r; | |
273 | } | |
274 | ||
275 | *ret = n; | |
276 | n = NULL; | |
277 | ||
278 | return 1; | |
279 | } | |
45ec7efb | 280 | |
703e4f5e LP |
281 | const char *dns_question_first_name(DnsQuestion *q) { |
282 | ||
283 | if (!q) | |
284 | return NULL; | |
45ec7efb LP |
285 | |
286 | if (q->n_keys < 1) | |
287 | return NULL; | |
288 | ||
289 | return DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
290 | } | |
291 | ||
23b298bc | 292 | int dns_question_new_address(DnsQuestion **ret, int family, const char *name, bool convert_idna) { |
45ec7efb | 293 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; |
23b298bc | 294 | _cleanup_free_ char *buf = NULL; |
45ec7efb LP |
295 | int r; |
296 | ||
297 | assert(ret); | |
298 | assert(name); | |
299 | ||
300 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
301 | return -EAFNOSUPPORT; | |
302 | ||
23b298bc LP |
303 | if (convert_idna) { |
304 | r = dns_name_apply_idna(name, &buf); | |
305 | if (r < 0) | |
306 | return r; | |
307 | ||
308 | name = buf; | |
309 | } | |
310 | ||
45ec7efb LP |
311 | q = dns_question_new(family == AF_UNSPEC ? 2 : 1); |
312 | if (!q) | |
313 | return -ENOMEM; | |
314 | ||
315 | if (family != AF_INET6) { | |
316 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
317 | ||
318 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, name); | |
319 | if (!key) | |
320 | return -ENOMEM; | |
321 | ||
322 | r = dns_question_add(q, key); | |
323 | if (r < 0) | |
324 | return r; | |
325 | } | |
326 | ||
327 | if (family != AF_INET) { | |
328 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
329 | ||
330 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
331 | if (!key) | |
332 | return -ENOMEM; | |
333 | ||
334 | r = dns_question_add(q, key); | |
335 | if (r < 0) | |
336 | return r; | |
337 | } | |
338 | ||
339 | *ret = q; | |
340 | q = NULL; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | int dns_question_new_reverse(DnsQuestion **ret, int family, const union in_addr_union *a) { | |
346 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
347 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
348 | _cleanup_free_ char *reverse = NULL; | |
349 | int r; | |
350 | ||
351 | assert(ret); | |
352 | assert(a); | |
353 | ||
354 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
355 | return -EAFNOSUPPORT; | |
356 | ||
357 | r = dns_name_reverse(family, a, &reverse); | |
358 | if (r < 0) | |
359 | return r; | |
360 | ||
361 | q = dns_question_new(1); | |
362 | if (!q) | |
363 | return -ENOMEM; | |
364 | ||
365 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse); | |
366 | if (!key) | |
367 | return -ENOMEM; | |
368 | ||
369 | reverse = NULL; | |
370 | ||
371 | r = dns_question_add(q, key); | |
372 | if (r < 0) | |
373 | return r; | |
374 | ||
375 | *ret = q; | |
376 | q = NULL; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
23b298bc LP |
381 | int dns_question_new_service( |
382 | DnsQuestion **ret, | |
383 | const char *service, | |
384 | const char *type, | |
385 | const char *domain, | |
386 | bool with_txt, | |
387 | bool convert_idna) { | |
388 | ||
45ec7efb LP |
389 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
390 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
23b298bc LP |
391 | _cleanup_free_ char *buf = NULL, *joined = NULL; |
392 | const char *name; | |
45ec7efb LP |
393 | int r; |
394 | ||
395 | assert(ret); | |
23b298bc LP |
396 | |
397 | /* We support three modes of invocation: | |
398 | * | |
399 | * 1. Only a domain is specified, in which case we assume a properly encoded SRV RR name, including service | |
400 | * type and possibly a service name. If specified in this way we assume it's already IDNA converted if | |
401 | * that's necessary. | |
402 | * | |
403 | * 2. Both service type and a domain specified, in which case a normal SRV RR is assumed, without a DNS-SD | |
404 | * style prefix. In this case we'll IDNA convert the domain, if that's requested. | |
405 | * | |
406 | * 3. All three of service name, type and domain are specified, in which case a DNS-SD service is put | |
407 | * together. The service name is never IDNA converted, and the domain is if requested. | |
408 | * | |
409 | * It's not supported to specify a service name without a type, or no domain name. | |
410 | */ | |
411 | ||
412 | if (!domain) | |
413 | return -EINVAL; | |
414 | ||
415 | if (type) { | |
416 | if (convert_idna) { | |
417 | r = dns_name_apply_idna(domain, &buf); | |
418 | if (r < 0) | |
419 | return r; | |
420 | ||
421 | domain = buf; | |
422 | } | |
423 | ||
424 | r = dns_service_join(service, type, domain, &joined); | |
425 | if (r < 0) | |
426 | return r; | |
427 | ||
428 | name = joined; | |
429 | } else { | |
430 | if (service) | |
431 | return -EINVAL; | |
432 | ||
433 | name = domain; | |
434 | } | |
45ec7efb LP |
435 | |
436 | q = dns_question_new(1 + with_txt); | |
437 | if (!q) | |
438 | return -ENOMEM; | |
439 | ||
440 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_SRV, name); | |
441 | if (!key) | |
442 | return -ENOMEM; | |
443 | ||
444 | r = dns_question_add(q, key); | |
445 | if (r < 0) | |
446 | return r; | |
447 | ||
448 | if (with_txt) { | |
449 | dns_resource_key_unref(key); | |
450 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_TXT, name); | |
451 | if (!key) | |
452 | return -ENOMEM; | |
453 | ||
454 | r = dns_question_add(q, key); | |
455 | if (r < 0) | |
456 | return r; | |
457 | } | |
458 | ||
459 | *ret = q; | |
460 | q = NULL; | |
461 | ||
462 | return 0; | |
463 | } |