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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 | ||
92 | int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr) { | |
93 | unsigned i; | |
94 | int r; | |
95 | ||
faa133f3 LP |
96 | assert(rr); |
97 | ||
8013e860 LP |
98 | if (!q) |
99 | return 0; | |
100 | ||
faa133f3 LP |
101 | for (i = 0; i < q->n_keys; i++) { |
102 | r = dns_resource_key_match_rr(q->keys[i], rr); | |
103 | if (r != 0) | |
104 | return r; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr) { | |
111 | unsigned i; | |
112 | int r; | |
113 | ||
faa133f3 LP |
114 | assert(rr); |
115 | ||
8013e860 LP |
116 | if (!q) |
117 | return 0; | |
118 | ||
faa133f3 LP |
119 | for (i = 0; i < q->n_keys; i++) { |
120 | r = dns_resource_key_match_cname(q->keys[i], rr); | |
121 | if (r != 0) | |
122 | return r; | |
123 | } | |
124 | ||
34b9656f | 125 | return 0; |
faa133f3 LP |
126 | } |
127 | ||
128 | int dns_question_is_valid(DnsQuestion *q) { | |
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 LP |
209 | assert(ret); |
210 | ||
8013e860 LP |
211 | if (!q) { |
212 | n = dns_question_new(0); | |
213 | if (!n) | |
214 | return -ENOMEM; | |
215 | ||
216 | *ret = n; | |
217 | n = 0; | |
218 | return 0; | |
219 | } | |
220 | ||
faa133f3 | 221 | for (i = 0; i < q->n_keys; i++) { |
36d9205d | 222 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(q->keys[i]), cname->cname.name); |
faa133f3 LP |
223 | if (r < 0) |
224 | return r; | |
225 | ||
226 | if (r == 0) { | |
227 | same = false; | |
228 | break; | |
229 | } | |
230 | } | |
231 | ||
232 | if (same) { | |
233 | /* Shortcut, the names are already right */ | |
234 | *ret = dns_question_ref(q); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | n = dns_question_new(q->n_keys); | |
239 | if (!n) | |
240 | return -ENOMEM; | |
241 | ||
242 | /* Create a new question, and patch in the new name */ | |
34b9656f | 243 | for (i = 0; i < q->n_keys; i++) { |
faa133f3 LP |
244 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *k = NULL; |
245 | ||
36d9205d | 246 | k = dns_resource_key_new_redirect(q->keys[i], cname); |
faa133f3 LP |
247 | if (!k) |
248 | return -ENOMEM; | |
249 | ||
250 | r = dns_question_add(n, k); | |
251 | if (r < 0) | |
252 | return r; | |
253 | } | |
254 | ||
255 | *ret = n; | |
256 | n = NULL; | |
257 | ||
258 | return 1; | |
259 | } | |
45ec7efb LP |
260 | |
261 | const char *dns_question_name(DnsQuestion *q) { | |
262 | assert(q); | |
263 | ||
264 | if (q->n_keys < 1) | |
265 | return NULL; | |
266 | ||
267 | return DNS_RESOURCE_KEY_NAME(q->keys[0]); | |
268 | } | |
269 | ||
270 | int dns_question_new_address(DnsQuestion **ret, int family, const char *name) { | |
271 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
272 | int r; | |
273 | ||
274 | assert(ret); | |
275 | assert(name); | |
276 | ||
277 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
278 | return -EAFNOSUPPORT; | |
279 | ||
280 | q = dns_question_new(family == AF_UNSPEC ? 2 : 1); | |
281 | if (!q) | |
282 | return -ENOMEM; | |
283 | ||
284 | if (family != AF_INET6) { | |
285 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
286 | ||
287 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, name); | |
288 | if (!key) | |
289 | return -ENOMEM; | |
290 | ||
291 | r = dns_question_add(q, key); | |
292 | if (r < 0) | |
293 | return r; | |
294 | } | |
295 | ||
296 | if (family != AF_INET) { | |
297 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
298 | ||
299 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, name); | |
300 | if (!key) | |
301 | return -ENOMEM; | |
302 | ||
303 | r = dns_question_add(q, key); | |
304 | if (r < 0) | |
305 | return r; | |
306 | } | |
307 | ||
308 | *ret = q; | |
309 | q = NULL; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | int dns_question_new_reverse(DnsQuestion **ret, int family, const union in_addr_union *a) { | |
315 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
316 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
317 | _cleanup_free_ char *reverse = NULL; | |
318 | int r; | |
319 | ||
320 | assert(ret); | |
321 | assert(a); | |
322 | ||
323 | if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) | |
324 | return -EAFNOSUPPORT; | |
325 | ||
326 | r = dns_name_reverse(family, a, &reverse); | |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
330 | q = dns_question_new(1); | |
331 | if (!q) | |
332 | return -ENOMEM; | |
333 | ||
334 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse); | |
335 | if (!key) | |
336 | return -ENOMEM; | |
337 | ||
338 | reverse = NULL; | |
339 | ||
340 | r = dns_question_add(q, key); | |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | *ret = q; | |
345 | q = NULL; | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | int dns_question_new_service(DnsQuestion **ret, const char *name, bool with_txt) { | |
351 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
352 | _cleanup_(dns_question_unrefp) DnsQuestion *q = NULL; | |
353 | int r; | |
354 | ||
355 | assert(ret); | |
356 | assert(name); | |
357 | ||
358 | q = dns_question_new(1 + with_txt); | |
359 | if (!q) | |
360 | return -ENOMEM; | |
361 | ||
362 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_SRV, name); | |
363 | if (!key) | |
364 | return -ENOMEM; | |
365 | ||
366 | r = dns_question_add(q, key); | |
367 | if (r < 0) | |
368 | return r; | |
369 | ||
370 | if (with_txt) { | |
371 | dns_resource_key_unref(key); | |
372 | key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_TXT, name); | |
373 | if (!key) | |
374 | return -ENOMEM; | |
375 | ||
376 | r = dns_question_add(q, key); | |
377 | if (r < 0) | |
378 | return r; | |
379 | } | |
380 | ||
381 | *ret = q; | |
382 | q = NULL; | |
383 | ||
384 | return 0; | |
385 | } |