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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 | ||
22 | #include <math.h> | |
23 | ||
24 | #include "strv.h" | |
25 | ||
26 | #include "resolved-dns-domain.h" | |
27 | #include "resolved-dns-rr.h" | |
28 | #include "dns-type.h" | |
29 | ||
30 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { | |
31 | DnsResourceKey *k; | |
32 | size_t l; | |
33 | ||
34 | assert(name); | |
35 | ||
36 | l = strlen(name); | |
37 | k = malloc0(sizeof(DnsResourceKey) + l + 1); | |
38 | if (!k) | |
39 | return NULL; | |
40 | ||
41 | k->n_ref = 1; | |
42 | k->class = class; | |
43 | k->type = type; | |
44 | ||
45 | strcpy((char*) k + sizeof(DnsResourceKey), name); | |
46 | ||
47 | return k; | |
48 | } | |
49 | ||
50 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { | |
51 | DnsResourceKey *k; | |
52 | ||
53 | assert(name); | |
54 | ||
55 | k = new0(DnsResourceKey, 1); | |
56 | if (!k) | |
57 | return NULL; | |
58 | ||
59 | k->n_ref = 1; | |
60 | k->class = class; | |
61 | k->type = type; | |
62 | k->_name = name; | |
63 | ||
64 | return k; | |
65 | } | |
66 | ||
67 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { | |
68 | ||
69 | if (!k) | |
70 | return NULL; | |
71 | ||
72 | assert(k->n_ref > 0); | |
73 | k->n_ref++; | |
74 | ||
75 | return k; | |
76 | } | |
77 | ||
78 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { | |
79 | if (!k) | |
80 | return NULL; | |
81 | ||
82 | assert(k->n_ref > 0); | |
83 | ||
84 | if (k->n_ref == 1) { | |
85 | free(k->_name); | |
86 | free(k); | |
87 | } else | |
88 | k->n_ref--; | |
89 | ||
90 | return NULL; | |
91 | } | |
92 | ||
93 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { | |
94 | int r; | |
95 | ||
96 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b)); | |
97 | if (r <= 0) | |
98 | return r; | |
99 | ||
100 | if (a->class != b->class) | |
101 | return 0; | |
102 | ||
103 | if (a->type != b->type) | |
104 | return 0; | |
105 | ||
106 | return 1; | |
107 | } | |
108 | ||
109 | int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
110 | assert(key); | |
111 | assert(rr); | |
112 | ||
113 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
114 | return 0; | |
115 | ||
116 | if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) | |
117 | return 0; | |
118 | ||
119 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
120 | } | |
121 | ||
122 | int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
123 | assert(key); | |
124 | assert(rr); | |
125 | ||
126 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
127 | return 0; | |
128 | ||
129 | if (rr->key->type != DNS_TYPE_CNAME) | |
130 | return 0; | |
131 | ||
132 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
133 | } | |
134 | ||
135 | unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) { | |
136 | const DnsResourceKey *k = i; | |
137 | unsigned long ul; | |
138 | ||
139 | ul = dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), hash_key); | |
140 | ul = ul * hash_key[0] + ul + k->class; | |
141 | ul = ul * hash_key[1] + ul + k->type; | |
142 | ||
143 | return ul; | |
144 | } | |
145 | ||
146 | int dns_resource_key_compare_func(const void *a, const void *b) { | |
147 | const DnsResourceKey *x = a, *y = b; | |
148 | int ret; | |
149 | ||
150 | ret = dns_name_compare_func(DNS_RESOURCE_KEY_NAME(x), DNS_RESOURCE_KEY_NAME(y)); | |
151 | if (ret != 0) | |
152 | return ret; | |
153 | ||
154 | if (x->type < y->type) | |
155 | return -1; | |
156 | if (x->type > y->type) | |
157 | return 1; | |
158 | ||
159 | if (x->class < y->class) | |
160 | return -1; | |
161 | if (x->class > y->class) | |
162 | return 1; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) { | |
168 | char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)]; | |
169 | const char *c, *t; | |
170 | char *s; | |
171 | ||
172 | c = dns_class_to_string(key->class); | |
173 | if (!c) { | |
174 | sprintf(cbuf, "%i", key->class); | |
175 | c = cbuf; | |
176 | } | |
177 | ||
178 | t = dns_type_to_string(key->type); | |
179 | if (!t){ | |
180 | sprintf(tbuf, "%i", key->type); | |
181 | t = tbuf; | |
182 | } | |
183 | ||
184 | if (asprintf(&s, "%s %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0) | |
185 | return -ENOMEM; | |
186 | ||
187 | *ret = s; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { | |
192 | DnsResourceRecord *rr; | |
193 | ||
194 | rr = new0(DnsResourceRecord, 1); | |
195 | if (!rr) | |
196 | return NULL; | |
197 | ||
198 | rr->n_ref = 1; | |
199 | rr->key = dns_resource_key_ref(key); | |
200 | ||
201 | return rr; | |
202 | } | |
203 | ||
204 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) { | |
205 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
206 | ||
207 | key = dns_resource_key_new(class, type, name); | |
208 | if (!key) | |
209 | return NULL; | |
210 | ||
211 | return dns_resource_record_new(key); | |
212 | } | |
213 | ||
214 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { | |
215 | if (!rr) | |
216 | return NULL; | |
217 | ||
218 | assert(rr->n_ref > 0); | |
219 | rr->n_ref++; | |
220 | ||
221 | return rr; | |
222 | } | |
223 | ||
224 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { | |
225 | if (!rr) | |
226 | return NULL; | |
227 | ||
228 | assert(rr->n_ref > 0); | |
229 | ||
230 | if (rr->n_ref > 1) { | |
231 | rr->n_ref--; | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | if (rr->key) { | |
236 | switch(rr->key->type) { | |
237 | ||
238 | case DNS_TYPE_SRV: | |
239 | free(rr->srv.name); | |
240 | break; | |
241 | ||
242 | case DNS_TYPE_PTR: | |
243 | case DNS_TYPE_NS: | |
244 | case DNS_TYPE_CNAME: | |
245 | case DNS_TYPE_DNAME: | |
246 | free(rr->ptr.name); | |
247 | break; | |
248 | ||
249 | case DNS_TYPE_HINFO: | |
250 | free(rr->hinfo.cpu); | |
251 | free(rr->hinfo.os); | |
252 | break; | |
253 | ||
254 | case DNS_TYPE_TXT: | |
255 | case DNS_TYPE_SPF: | |
256 | strv_free(rr->txt.strings); | |
257 | break; | |
258 | ||
259 | case DNS_TYPE_SOA: | |
260 | free(rr->soa.mname); | |
261 | free(rr->soa.rname); | |
262 | break; | |
263 | ||
264 | case DNS_TYPE_MX: | |
265 | free(rr->mx.exchange); | |
266 | break; | |
267 | ||
268 | case DNS_TYPE_SSHFP: | |
269 | free(rr->sshfp.key); | |
270 | break; | |
271 | ||
272 | case DNS_TYPE_LOC: | |
273 | case DNS_TYPE_A: | |
274 | case DNS_TYPE_AAAA: | |
275 | break; | |
276 | ||
277 | default: | |
278 | free(rr->generic.data); | |
279 | } | |
280 | ||
281 | dns_resource_key_unref(rr->key); | |
282 | } | |
283 | ||
284 | free(rr); | |
285 | ||
286 | return NULL; | |
287 | } | |
288 | ||
289 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { | |
290 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
291 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
292 | _cleanup_free_ char *ptr = NULL; | |
293 | int r; | |
294 | ||
295 | assert(ret); | |
296 | assert(address); | |
297 | assert(hostname); | |
298 | ||
299 | r = dns_name_reverse(family, address, &ptr); | |
300 | if (r < 0) | |
301 | return r; | |
302 | ||
303 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); | |
304 | if (!key) | |
305 | return -ENOMEM; | |
306 | ||
307 | ptr = NULL; | |
308 | ||
309 | rr = dns_resource_record_new(key); | |
310 | if (!rr) | |
311 | return -ENOMEM; | |
312 | ||
313 | rr->ptr.name = strdup(hostname); | |
314 | if (!rr->ptr.name) | |
315 | return -ENOMEM; | |
316 | ||
317 | *ret = rr; | |
318 | rr = NULL; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { | |
324 | int r; | |
325 | ||
326 | assert(a); | |
327 | assert(b); | |
328 | ||
329 | r = dns_resource_key_equal(a->key, b->key); | |
330 | if (r <= 0) | |
331 | return r; | |
332 | ||
333 | if (a->unparseable != b->unparseable) | |
334 | return 0; | |
335 | ||
336 | switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) { | |
337 | ||
338 | case DNS_TYPE_SRV: | |
339 | r = dns_name_equal(a->srv.name, b->srv.name); | |
340 | if (r <= 0) | |
341 | return r; | |
342 | ||
343 | return a->srv.priority == b->srv.priority && | |
344 | a->srv.weight == b->srv.weight && | |
345 | a->srv.port == b->srv.port; | |
346 | ||
347 | case DNS_TYPE_PTR: | |
348 | case DNS_TYPE_NS: | |
349 | case DNS_TYPE_CNAME: | |
350 | case DNS_TYPE_DNAME: | |
351 | return dns_name_equal(a->ptr.name, b->ptr.name); | |
352 | ||
353 | case DNS_TYPE_HINFO: | |
354 | return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) && | |
355 | strcaseeq(a->hinfo.os, b->hinfo.os); | |
356 | ||
357 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
358 | case DNS_TYPE_TXT: { | |
359 | int i; | |
360 | ||
361 | for (i = 0; a->txt.strings[i] || b->txt.strings[i]; i++) | |
362 | if (!streq_ptr(a->txt.strings[i], b->txt.strings[i])) | |
363 | return false; | |
364 | return true; | |
365 | } | |
366 | ||
367 | case DNS_TYPE_A: | |
368 | return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; | |
369 | ||
370 | case DNS_TYPE_AAAA: | |
371 | return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; | |
372 | ||
373 | case DNS_TYPE_SOA: | |
374 | r = dns_name_equal(a->soa.mname, b->soa.mname); | |
375 | if (r <= 0) | |
376 | return r; | |
377 | r = dns_name_equal(a->soa.rname, b->soa.rname); | |
378 | if (r <= 0) | |
379 | return r; | |
380 | ||
381 | return a->soa.serial == b->soa.serial && | |
382 | a->soa.refresh == b->soa.refresh && | |
383 | a->soa.retry == b->soa.retry && | |
384 | a->soa.expire == b->soa.expire && | |
385 | a->soa.minimum == b->soa.minimum; | |
386 | ||
387 | case DNS_TYPE_MX: | |
388 | if (a->mx.priority != b->mx.priority) | |
389 | return 0; | |
390 | ||
391 | return dns_name_equal(a->mx.exchange, b->mx.exchange); | |
392 | ||
393 | case DNS_TYPE_LOC: | |
394 | assert(a->loc.version == b->loc.version); | |
395 | ||
396 | return a->loc.size == b->loc.size && | |
397 | a->loc.horiz_pre == b->loc.horiz_pre && | |
398 | a->loc.vert_pre == b->loc.vert_pre && | |
399 | a->loc.latitude == b->loc.latitude && | |
400 | a->loc.longitude == b->loc.longitude && | |
401 | a->loc.altitude == b->loc.altitude; | |
402 | ||
403 | case DNS_TYPE_SSHFP: | |
404 | return a->sshfp.algorithm == b->sshfp.algorithm && | |
405 | a->sshfp.fptype == b->sshfp.fptype && | |
406 | a->sshfp.key_size == b->sshfp.key_size && | |
407 | memcmp(a->sshfp.key, b->sshfp.key, a->sshfp.key_size) == 0; | |
408 | ||
409 | default: | |
410 | return a->generic.size == b->generic.size && | |
411 | memcmp(a->generic.data, b->generic.data, a->generic.size) == 0; | |
412 | } | |
413 | } | |
414 | ||
415 | static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude, | |
416 | uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) { | |
417 | char *s; | |
418 | char NS = latitude >= 1U<<31 ? 'N' : 'S'; | |
419 | char EW = longitude >= 1U<<31 ? 'E' : 'W'; | |
420 | ||
421 | int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude); | |
422 | int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude); | |
423 | double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude); | |
424 | double siz = (size >> 4) * exp10((double) (size & 0xF)); | |
425 | double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF)); | |
426 | double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF)); | |
427 | ||
428 | if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm", | |
429 | (lat / 60000 / 60), | |
430 | (lat / 60000) % 60, | |
431 | (lat % 60000) / 1000., | |
432 | NS, | |
433 | (lon / 60000 / 60), | |
434 | (lon / 60000) % 60, | |
435 | (lon % 60000) / 1000., | |
436 | EW, | |
437 | alt / 100., | |
438 | siz / 100., | |
439 | hor / 100., | |
440 | ver / 100.) < 0) | |
441 | return NULL; | |
442 | ||
443 | return s; | |
444 | } | |
445 | ||
446 | int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) { | |
447 | _cleanup_free_ char *k = NULL; | |
448 | char *s; | |
449 | int r; | |
450 | ||
451 | assert(rr); | |
452 | ||
453 | r = dns_resource_key_to_string(rr->key, &k); | |
454 | if (r < 0) | |
455 | return r; | |
456 | ||
457 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
458 | ||
459 | case DNS_TYPE_SRV: | |
460 | r = asprintf(&s, "%s %u %u %u %s", | |
461 | k, | |
462 | rr->srv.priority, | |
463 | rr->srv.weight, | |
464 | rr->srv.port, | |
465 | strna(rr->srv.name)); | |
466 | if (r < 0) | |
467 | return -ENOMEM; | |
468 | break; | |
469 | ||
470 | case DNS_TYPE_PTR: | |
471 | case DNS_TYPE_NS: | |
472 | case DNS_TYPE_CNAME: | |
473 | case DNS_TYPE_DNAME: | |
474 | s = strjoin(k, " ", rr->ptr.name, NULL); | |
475 | if (!s) | |
476 | return -ENOMEM; | |
477 | ||
478 | break; | |
479 | ||
480 | case DNS_TYPE_HINFO: | |
481 | s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL); | |
482 | if (!s) | |
483 | return -ENOMEM; | |
484 | break; | |
485 | ||
486 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
487 | case DNS_TYPE_TXT: { | |
488 | _cleanup_free_ char *t; | |
489 | ||
490 | t = strv_join_quoted(rr->txt.strings); | |
491 | if (!t) | |
492 | return -ENOMEM; | |
493 | ||
494 | s = strjoin(k, " ", t, NULL); | |
495 | if (!s) | |
496 | return -ENOMEM; | |
497 | ||
498 | break; | |
499 | } | |
500 | ||
501 | case DNS_TYPE_A: { | |
502 | _cleanup_free_ char *x = NULL; | |
503 | ||
504 | r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x); | |
505 | if (r < 0) | |
506 | return r; | |
507 | ||
508 | s = strjoin(k, " ", x, NULL); | |
509 | if (!s) | |
510 | return -ENOMEM; | |
511 | break; | |
512 | } | |
513 | ||
514 | case DNS_TYPE_AAAA: { | |
515 | _cleanup_free_ char *x = NULL; | |
516 | ||
517 | r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &x); | |
518 | if (r < 0) | |
519 | return r; | |
520 | ||
521 | s = strjoin(k, " ", x, NULL); | |
522 | if (!s) | |
523 | return -ENOMEM; | |
524 | break; | |
525 | } | |
526 | ||
527 | case DNS_TYPE_SOA: | |
528 | r = asprintf(&s, "%s %s %s %u %u %u %u %u", | |
529 | k, | |
530 | strna(rr->soa.mname), | |
531 | strna(rr->soa.rname), | |
532 | rr->soa.serial, | |
533 | rr->soa.refresh, | |
534 | rr->soa.retry, | |
535 | rr->soa.expire, | |
536 | rr->soa.minimum); | |
537 | if (r < 0) | |
538 | return -ENOMEM; | |
539 | break; | |
540 | ||
541 | case DNS_TYPE_MX: | |
542 | r = asprintf(&s, "%s %u %s", | |
543 | k, | |
544 | rr->mx.priority, | |
545 | rr->mx.exchange); | |
546 | if (r < 0) | |
547 | return -ENOMEM; | |
548 | break; | |
549 | ||
550 | case DNS_TYPE_LOC: { | |
551 | _cleanup_free_ char *loc; | |
552 | assert(rr->loc.version == 0); | |
553 | ||
554 | loc = format_location(rr->loc.latitude, | |
555 | rr->loc.longitude, | |
556 | rr->loc.altitude, | |
557 | rr->loc.size, | |
558 | rr->loc.horiz_pre, | |
559 | rr->loc.vert_pre); | |
560 | if (!loc) | |
561 | return -ENOMEM; | |
562 | ||
563 | s = strjoin(k, " ", loc, NULL); | |
564 | if (!s) | |
565 | return -ENOMEM; | |
566 | ||
567 | break; | |
568 | } | |
569 | ||
570 | case DNS_TYPE_SSHFP: { | |
571 | _cleanup_free_ char *x = NULL; | |
572 | ||
573 | x = hexmem(rr->sshfp.key, rr->sshfp.key_size); | |
574 | if (!x) | |
575 | return -ENOMEM; | |
576 | ||
577 | r = asprintf(&s, "%s %u %u %s", | |
578 | k, | |
579 | rr->sshfp.algorithm, | |
580 | rr->sshfp.fptype, | |
581 | x); | |
582 | if (r < 0) | |
583 | return -ENOMEM; | |
584 | break; | |
585 | } | |
586 | ||
587 | default: { | |
588 | _cleanup_free_ char *x = NULL; | |
589 | ||
590 | x = hexmem(rr->generic.data, rr->generic.size); | |
591 | if (!x) | |
592 | return -ENOMEM; | |
593 | ||
594 | s = strjoin(k, " ", x, NULL); | |
595 | if (!s) | |
596 | return -ENOMEM; | |
597 | break; | |
598 | }} | |
599 | ||
600 | *ret = s; | |
601 | return 0; | |
602 | } | |
603 | ||
604 | const char *dns_class_to_string(uint16_t class) { | |
605 | ||
606 | switch (class) { | |
607 | ||
608 | case DNS_CLASS_IN: | |
609 | return "IN"; | |
610 | ||
611 | case DNS_CLASS_ANY: | |
612 | return "ANY"; | |
613 | } | |
614 | ||
615 | return NULL; | |
616 | } | |
617 | ||
618 | int dns_class_from_string(const char *s, uint16_t *class) { | |
619 | assert(s); | |
620 | assert(class); | |
621 | ||
622 | if (strcaseeq(s, "IN")) | |
623 | *class = DNS_CLASS_IN; | |
624 | else if (strcaseeq(s, "ANY")) | |
625 | *class = DNS_TYPE_ANY; | |
626 | else | |
627 | return -EINVAL; | |
628 | ||
629 | return 0; | |
630 | } |