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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
faa133f3 | 2 | |
b5efdb8a | 3 | #include "alloc-util.h" |
4ad7f276 | 4 | #include "dns-domain.h" |
0f7091e6 | 5 | #include "dns-type.h" |
b5efdb8a | 6 | #include "resolved-dns-question.h" |
faa133f3 | 7 | |
da6053d0 | 8 | DnsQuestion *dns_question_new(size_t n) { |
faa133f3 LP |
9 | DnsQuestion *q; |
10 | ||
11 | assert(n > 0); | |
12 | ||
13 | q = malloc0(offsetof(DnsQuestion, keys) + sizeof(DnsResourceKey*) * n); | |
14 | if (!q) | |
15 | return NULL; | |
16 | ||
17 | q->n_ref = 1; | |
18 | q->n_allocated = n; | |
19 | ||
20 | return q; | |
21 | } | |
22 | ||
23 | DnsQuestion *dns_question_ref(DnsQuestion *q) { | |
24 | if (!q) | |
25 | return NULL; | |
26 | ||
27 | assert(q->n_ref > 0); | |
28 | q->n_ref++; | |
29 | return q; | |
30 | } | |
31 | ||
32 | DnsQuestion *dns_question_unref(DnsQuestion *q) { | |
33 | if (!q) | |
34 | return NULL; | |
35 | ||
36 | assert(q->n_ref > 0); | |
37 | ||
38 | if (q->n_ref == 1) { | |
da6053d0 | 39 | size_t i; |
faa133f3 LP |
40 | |
41 | for (i = 0; i < q->n_keys; i++) | |
42 | dns_resource_key_unref(q->keys[i]); | |
43 | free(q); | |
44 | } else | |
45 | q->n_ref--; | |
46 | ||
47 | return NULL; | |
48 | } | |
49 | ||
50 | int dns_question_add(DnsQuestion *q, DnsResourceKey *key) { | |
da6053d0 | 51 | size_t i; |
7e8e0422 LP |
52 | int r; |
53 | ||
faa133f3 LP |
54 | assert(key); |
55 | ||
8013e860 LP |
56 | if (!q) |
57 | return -ENOSPC; | |
58 | ||
7e8e0422 LP |
59 | for (i = 0; i < q->n_keys; i++) { |
60 | r = dns_resource_key_equal(q->keys[i], key); | |
61 | if (r < 0) | |
62 | return r; | |
63 | if (r > 0) | |
64 | return 0; | |
65 | } | |
66 | ||
faa133f3 LP |
67 | if (q->n_keys >= q->n_allocated) |
68 | return -ENOSPC; | |
69 | ||
70 | q->keys[q->n_keys++] = dns_resource_key_ref(key); | |
71 | return 0; | |
72 | } | |
73 | ||
801ad6a6 | 74 | int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
da6053d0 | 75 | size_t i; |
faa133f3 LP |
76 | int r; |
77 | ||
faa133f3 LP |
78 | assert(rr); |
79 | ||
8013e860 LP |
80 | if (!q) |
81 | return 0; | |
82 | ||
faa133f3 | 83 | for (i = 0; i < q->n_keys; i++) { |
801ad6a6 | 84 | r = dns_resource_key_match_rr(q->keys[i], rr, search_domain); |
faa133f3 LP |
85 | if (r != 0) |
86 | return r; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
542e0c84 | 92 | int dns_question_matches_cname_or_dname(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) { |
da6053d0 | 93 | size_t i; |
faa133f3 LP |
94 | int r; |
95 | ||
faa133f3 LP |
96 | assert(rr); |
97 | ||
8013e860 LP |
98 | if (!q) |
99 | return 0; | |
100 | ||
542e0c84 LP |
101 | if (!IN_SET(rr->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)) |
102 | return 0; | |
103 | ||
faa133f3 | 104 | for (i = 0; i < q->n_keys; i++) { |
542e0c84 LP |
105 | /* For a {C,D}NAME record we can never find a matching {C,D}NAME record */ |
106 | if (!dns_type_may_redirect(q->keys[i]->type)) | |
107 | return 0; | |
108 | ||
5d27351f | 109 | r = dns_resource_key_match_cname_or_dname(q->keys[i], rr->key, search_domain); |
faa133f3 LP |
110 | if (r != 0) |
111 | return r; | |
112 | } | |
113 | ||
34b9656f | 114 | return 0; |
faa133f3 LP |
115 | } |
116 | ||
703e4f5e | 117 | int dns_question_is_valid_for_query(DnsQuestion *q) { |
faa133f3 | 118 | const char *name; |
da6053d0 | 119 | size_t i; |
faa133f3 LP |
120 | int r; |
121 | ||
8013e860 LP |
122 | if (!q) |
123 | return 0; | |
faa133f3 LP |
124 | |
125 | if (q->n_keys <= 0) | |
126 | return 0; | |
127 | ||
128 | if (q->n_keys > 65535) | |
129 | return 0; | |
130 | ||
1c02e7ba | 131 | name = dns_resource_key_name(q->keys[0]); |
faa133f3 LP |
132 | if (!name) |
133 | return 0; | |
134 | ||
135 | /* Check that all keys in this question bear the same name */ | |
0f7091e6 | 136 | for (i = 0; i < q->n_keys; i++) { |
34b9656f LP |
137 | assert(q->keys[i]); |
138 | ||
0f7091e6 | 139 | if (i > 0) { |
1c02e7ba | 140 | r = dns_name_equal(dns_resource_key_name(q->keys[i]), name); |
0f7091e6 LP |
141 | if (r <= 0) |
142 | return r; | |
143 | } | |
144 | ||
145 | if (!dns_type_is_valid_query(q->keys[i]->type)) | |
146 | return 0; | |
faa133f3 LP |
147 | } |
148 | ||
149 | return 1; | |
150 | } | |
151 | ||
6a21960c | 152 | int dns_question_contains(DnsQuestion *a, const DnsResourceKey *k) { |
da6053d0 | 153 | size_t j; |
1086182d LP |
154 | int r; |
155 | ||
1086182d LP |
156 | assert(k); |
157 | ||
8013e860 LP |
158 | if (!a) |
159 | return 0; | |
160 | ||
1086182d LP |
161 | for (j = 0; j < a->n_keys; j++) { |
162 | r = dns_resource_key_equal(a->keys[j], k); | |
163 | if (r != 0) | |
164 | return r; | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) { | |
da6053d0 | 171 | size_t j; |
1086182d LP |
172 | int r; |
173 | ||
b6800689 LP |
174 | if (a == b) |
175 | return 1; | |
176 | ||
8013e860 LP |
177 | if (!a) |
178 | return !b || b->n_keys == 0; | |
179 | if (!b) | |
180 | return a->n_keys == 0; | |
1086182d LP |
181 | |
182 | /* Checks if all keys in a are also contained b, and vice versa */ | |
183 | ||
184 | for (j = 0; j < a->n_keys; j++) { | |
185 | r = dns_question_contains(b, a->keys[j]); | |
186 | if (r <= 0) | |
187 | return r; | |
188 | } | |
189 | ||
190 | for (j = 0; j < b->n_keys; j++) { | |
191 | r = dns_question_contains(a, b->keys[j]); | |
192 | if (r <= 0) | |
193 | return r; | |
194 | } | |
195 | ||
196 | return 1; | |
197 | } | |
198 | ||
36d9205d | 199 | int dns_question_cname_redirect(DnsQuestion *q, const DnsResourceRecord *cname, DnsQuestion **ret) { |
faa133f3 | 200 | _cleanup_(dns_question_unrefp) DnsQuestion *n = NULL; |
23b298bc | 201 | DnsResourceKey *key; |
faa133f3 | 202 | bool same = true; |
faa133f3 LP |
203 | int r; |
204 | ||
36d9205d | 205 | assert(cname); |
faa133f3 | 206 | assert(ret); |
58db254a | 207 | assert(IN_SET(cname->key->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME)); |
faa133f3 | 208 | |
23b298bc LP |
209 | if (dns_question_size(q) <= 0) { |
210 | *ret = NULL; | |
8013e860 LP |
211 | return 0; |
212 | } | |
213 | ||
23b298bc | 214 | DNS_QUESTION_FOREACH(key, q) { |
58db254a LP |
215 | _cleanup_free_ char *destination = NULL; |
216 | const char *d; | |
217 | ||
218 | if (cname->key->type == DNS_TYPE_CNAME) | |
219 | d = cname->cname.name; | |
220 | else { | |
1c02e7ba | 221 | r = dns_name_change_suffix(dns_resource_key_name(key), dns_resource_key_name(cname->key), cname->dname.name, &destination); |
58db254a LP |
222 | if (r < 0) |
223 | return r; | |
224 | if (r == 0) | |
225 | continue; | |
226 | ||
227 | d = destination; | |
228 | } | |
229 | ||
1c02e7ba | 230 | r = dns_name_equal(dns_resource_key_name(key), d); |
faa133f3 LP |
231 | if (r < 0) |
232 | return r; | |
233 | ||
234 | if (r == 0) { | |
235 | same = false; | |
236 | break; | |
237 | } | |
238 | } | |
239 | ||
23b298bc | 240 | /* Fully the same, indicate we didn't do a thing */ |
faa133f3 | 241 | if (same) { |
23b298bc | 242 | *ret = NULL; |
faa133f3 LP |
243 | return 0; |
244 | } | |
245 | ||
246 | n = dns_question_new(q->n_keys); | |
247 | if (!n) | |
248 | return -ENOMEM; | |
249 | ||
250 | /* Create a new question, and patch in the new name */ | |
23b298bc | 251 | DNS_QUESTION_FOREACH(key, q) { |
faa133f3 LP |
252 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL; |
253 | ||
23b298bc | 254 | k = dns_resource_key_new_redirect(key, cname); |
faa133f3 LP |
255 | if (!k) |
256 | return -ENOMEM; | |
257 | ||
258 | r = dns_question_add(n, k); | |
259 | if (r < 0) | |
260 | return r; | |
261 | } | |
262 | ||
1cc6c93a | 263 | *ret = TAKE_PTR(n); |
faa133f3 LP |
264 | |
265 | return 1; | |
266 | } | |
45ec7efb | 267 | |
703e4f5e LP |
268 | const char *dns_question_first_name(DnsQuestion *q) { |
269 | ||
270 | if (!q) | |
271 | return NULL; | |
45ec7efb LP |
272 | |
273 | if (q->n_keys < 1) | |
274 | return NULL; | |
275 | ||
1c02e7ba | 276 | return dns_resource_key_name(q->keys[0]); |
45ec7efb LP |
277 | } |
278 | ||
23b298bc | 279 | int dns_question_new_address(DnsQuestion **ret, int family, const char *name, bool convert_idna) { |
45ec7efb | 280 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; |
23b298bc | 281 | _cleanup_free_ char *buf = NULL; |
45ec7efb LP |
282 | int r; |
283 | ||
284 | assert(ret); | |
285 | assert(name); | |
286 | ||
287 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
288 | return -EAFNOSUPPORT; | |
289 | ||
23b298bc LP |
290 | if (convert_idna) { |
291 | r = dns_name_apply_idna(name, &buf); | |
292 | if (r < 0) | |
293 | return r; | |
ad1f3fe6 | 294 | if (r > 0 && !streq(name, buf)) |
87057e24 | 295 | name = buf; |
ad1f3fe6 ZJS |
296 | else |
297 | /* We did not manage to create convert the idna name, or it's | |
298 | * the same as the original name. We assume the caller already | |
299 | * created an uncoverted question, so let's not repeat work | |
300 | * unnecessarily. */ | |
301 | return -EALREADY; | |
23b298bc LP |
302 | } |
303 | ||
45ec7efb LP |
304 | q = dns_question_new(family == AF_UNSPEC ? 2 : 1); |
305 | if (!q) | |
306 | return -ENOMEM; | |
307 | ||
308 | if (family != AF_INET6) { | |
309 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
310 | ||
311 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, name); | |
312 | if (!key) | |
313 | return -ENOMEM; | |
314 | ||
315 | r = dns_question_add(q, key); | |
316 | if (r < 0) | |
317 | return r; | |
318 | } | |
319 | ||
320 | if (family != AF_INET) { | |
321 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
322 | ||
323 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
324 | if (!key) | |
325 | return -ENOMEM; | |
326 | ||
327 | r = dns_question_add(q, key); | |
328 | if (r < 0) | |
329 | return r; | |
330 | } | |
331 | ||
1cc6c93a | 332 | *ret = TAKE_PTR(q); |
45ec7efb LP |
333 | |
334 | return 0; | |
335 | } | |
336 | ||
337 | int dns_question_new_reverse(DnsQuestion **ret, int family, const union in_addr_union *a) { | |
338 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
339 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
340 | _cleanup_free_ char *reverse = NULL; | |
341 | int r; | |
342 | ||
343 | assert(ret); | |
344 | assert(a); | |
345 | ||
346 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
347 | return -EAFNOSUPPORT; | |
348 | ||
349 | r = dns_name_reverse(family, a, &reverse); | |
350 | if (r < 0) | |
351 | return r; | |
352 | ||
353 | q = dns_question_new(1); | |
354 | if (!q) | |
355 | return -ENOMEM; | |
356 | ||
357 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse); | |
358 | if (!key) | |
359 | return -ENOMEM; | |
360 | ||
361 | reverse = NULL; | |
362 | ||
363 | r = dns_question_add(q, key); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
1cc6c93a | 367 | *ret = TAKE_PTR(q); |
45ec7efb LP |
368 | |
369 | return 0; | |
370 | } | |
371 | ||
23b298bc LP |
372 | int dns_question_new_service( |
373 | DnsQuestion **ret, | |
374 | const char *service, | |
375 | const char *type, | |
376 | const char *domain, | |
377 | bool with_txt, | |
378 | bool convert_idna) { | |
379 | ||
45ec7efb LP |
380 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; |
381 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
23b298bc LP |
382 | _cleanup_free_ char *buf = NULL, *joined = NULL; |
383 | const char *name; | |
45ec7efb LP |
384 | int r; |
385 | ||
386 | assert(ret); | |
23b298bc LP |
387 | |
388 | /* We support three modes of invocation: | |
389 | * | |
390 | * 1. Only a domain is specified, in which case we assume a properly encoded SRV RR name, including service | |
391 | * type and possibly a service name. If specified in this way we assume it's already IDNA converted if | |
392 | * that's necessary. | |
393 | * | |
394 | * 2. Both service type and a domain specified, in which case a normal SRV RR is assumed, without a DNS-SD | |
395 | * style prefix. In this case we'll IDNA convert the domain, if that's requested. | |
396 | * | |
397 | * 3. All three of service name, type and domain are specified, in which case a DNS-SD service is put | |
398 | * together. The service name is never IDNA converted, and the domain is if requested. | |
399 | * | |
400 | * It's not supported to specify a service name without a type, or no domain name. | |
401 | */ | |
402 | ||
403 | if (!domain) | |
404 | return -EINVAL; | |
405 | ||
406 | if (type) { | |
407 | if (convert_idna) { | |
408 | r = dns_name_apply_idna(domain, &buf); | |
409 | if (r < 0) | |
410 | return r; | |
87057e24 ZJS |
411 | if (r > 0) |
412 | domain = buf; | |
23b298bc LP |
413 | } |
414 | ||
415 | r = dns_service_join(service, type, domain, &joined); | |
416 | if (r < 0) | |
417 | return r; | |
418 | ||
419 | name = joined; | |
420 | } else { | |
421 | if (service) | |
422 | return -EINVAL; | |
423 | ||
424 | name = domain; | |
425 | } | |
45ec7efb LP |
426 | |
427 | q = dns_question_new(1 + with_txt); | |
428 | if (!q) | |
429 | return -ENOMEM; | |
430 | ||
431 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_SRV, name); | |
432 | if (!key) | |
433 | return -ENOMEM; | |
434 | ||
435 | r = dns_question_add(q, key); | |
436 | if (r < 0) | |
437 | return r; | |
438 | ||
439 | if (with_txt) { | |
440 | dns_resource_key_unref(key); | |
441 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_TXT, name); | |
442 | if (!key) | |
443 | return -ENOMEM; | |
444 | ||
445 | r = dns_question_add(q, key); | |
446 | if (r < 0) | |
447 | return r; | |
448 | } | |
449 | ||
1cc6c93a | 450 | *ret = TAKE_PTR(q); |
45ec7efb LP |
451 | |
452 | return 0; | |
453 | } |