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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 "resolved-dns-packet.h" | |
29 | #include "dns-type.h" | |
30 | ||
31 | DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name) { | |
32 | DnsResourceKey *k; | |
33 | size_t l; | |
34 | ||
35 | assert(name); | |
36 | ||
37 | l = strlen(name); | |
38 | k = malloc0(sizeof(DnsResourceKey) + l + 1); | |
39 | if (!k) | |
40 | return NULL; | |
41 | ||
42 | k->n_ref = 1; | |
43 | k->class = class; | |
44 | k->type = type; | |
45 | ||
46 | strcpy((char*) k + sizeof(DnsResourceKey), name); | |
47 | ||
48 | return k; | |
49 | } | |
50 | ||
51 | DnsResourceKey* dns_resource_key_new_consume(uint16_t class, uint16_t type, char *name) { | |
52 | DnsResourceKey *k; | |
53 | ||
54 | assert(name); | |
55 | ||
56 | k = new0(DnsResourceKey, 1); | |
57 | if (!k) | |
58 | return NULL; | |
59 | ||
60 | k->n_ref = 1; | |
61 | k->class = class; | |
62 | k->type = type; | |
63 | k->_name = name; | |
64 | ||
65 | return k; | |
66 | } | |
67 | ||
68 | DnsResourceKey* dns_resource_key_ref(DnsResourceKey *k) { | |
69 | ||
70 | if (!k) | |
71 | return NULL; | |
72 | ||
73 | assert(k->n_ref > 0); | |
74 | k->n_ref++; | |
75 | ||
76 | return k; | |
77 | } | |
78 | ||
79 | DnsResourceKey* dns_resource_key_unref(DnsResourceKey *k) { | |
80 | if (!k) | |
81 | return NULL; | |
82 | ||
83 | assert(k->n_ref > 0); | |
84 | ||
85 | if (k->n_ref == 1) { | |
86 | free(k->_name); | |
87 | free(k); | |
88 | } else | |
89 | k->n_ref--; | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { | |
95 | int r; | |
96 | ||
97 | r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b)); | |
98 | if (r <= 0) | |
99 | return r; | |
100 | ||
101 | if (a->class != b->class) | |
102 | return 0; | |
103 | ||
104 | if (a->type != b->type) | |
105 | return 0; | |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
110 | int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
111 | assert(key); | |
112 | assert(rr); | |
113 | ||
114 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
115 | return 0; | |
116 | ||
117 | if (rr->key->type != key->type && key->type != DNS_TYPE_ANY) | |
118 | return 0; | |
119 | ||
120 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
121 | } | |
122 | ||
123 | int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr) { | |
124 | assert(key); | |
125 | assert(rr); | |
126 | ||
127 | if (rr->key->class != key->class && key->class != DNS_CLASS_ANY) | |
128 | return 0; | |
129 | ||
130 | if (rr->key->type != DNS_TYPE_CNAME) | |
131 | return 0; | |
132 | ||
133 | return dns_name_equal(DNS_RESOURCE_KEY_NAME(rr->key), DNS_RESOURCE_KEY_NAME(key)); | |
134 | } | |
135 | ||
136 | unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) { | |
137 | const DnsResourceKey *k = i; | |
138 | unsigned long ul; | |
139 | ||
140 | ul = dns_name_hash_func(DNS_RESOURCE_KEY_NAME(k), hash_key); | |
141 | ul = ul * hash_key[0] + ul + k->class; | |
142 | ul = ul * hash_key[1] + ul + k->type; | |
143 | ||
144 | return ul; | |
145 | } | |
146 | ||
147 | int dns_resource_key_compare_func(const void *a, const void *b) { | |
148 | const DnsResourceKey *x = a, *y = b; | |
149 | int ret; | |
150 | ||
151 | ret = dns_name_compare_func(DNS_RESOURCE_KEY_NAME(x), DNS_RESOURCE_KEY_NAME(y)); | |
152 | if (ret != 0) | |
153 | return ret; | |
154 | ||
155 | if (x->type < y->type) | |
156 | return -1; | |
157 | if (x->type > y->type) | |
158 | return 1; | |
159 | ||
160 | if (x->class < y->class) | |
161 | return -1; | |
162 | if (x->class > y->class) | |
163 | return 1; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) { | |
169 | char cbuf[DECIMAL_STR_MAX(uint16_t)], tbuf[DECIMAL_STR_MAX(uint16_t)]; | |
170 | const char *c, *t; | |
171 | char *s; | |
172 | ||
173 | c = dns_class_to_string(key->class); | |
174 | if (!c) { | |
175 | sprintf(cbuf, "%i", key->class); | |
176 | c = cbuf; | |
177 | } | |
178 | ||
179 | t = dns_type_to_string(key->type); | |
180 | if (!t){ | |
181 | sprintf(tbuf, "%i", key->type); | |
182 | t = tbuf; | |
183 | } | |
184 | ||
185 | if (asprintf(&s, "%s %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0) | |
186 | return -ENOMEM; | |
187 | ||
188 | *ret = s; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | DnsResourceRecord* dns_resource_record_new(DnsResourceKey *key) { | |
193 | DnsResourceRecord *rr; | |
194 | ||
195 | rr = new0(DnsResourceRecord, 1); | |
196 | if (!rr) | |
197 | return NULL; | |
198 | ||
199 | rr->n_ref = 1; | |
200 | rr->key = dns_resource_key_ref(key); | |
201 | ||
202 | return rr; | |
203 | } | |
204 | ||
205 | DnsResourceRecord* dns_resource_record_new_full(uint16_t class, uint16_t type, const char *name) { | |
206 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
207 | ||
208 | key = dns_resource_key_new(class, type, name); | |
209 | if (!key) | |
210 | return NULL; | |
211 | ||
212 | return dns_resource_record_new(key); | |
213 | } | |
214 | ||
215 | DnsResourceRecord* dns_resource_record_ref(DnsResourceRecord *rr) { | |
216 | if (!rr) | |
217 | return NULL; | |
218 | ||
219 | assert(rr->n_ref > 0); | |
220 | rr->n_ref++; | |
221 | ||
222 | return rr; | |
223 | } | |
224 | ||
225 | DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) { | |
226 | if (!rr) | |
227 | return NULL; | |
228 | ||
229 | assert(rr->n_ref > 0); | |
230 | ||
231 | if (rr->n_ref > 1) { | |
232 | rr->n_ref--; | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | if (rr->key) { | |
237 | switch(rr->key->type) { | |
238 | ||
239 | case DNS_TYPE_SRV: | |
240 | free(rr->srv.name); | |
241 | break; | |
242 | ||
243 | case DNS_TYPE_PTR: | |
244 | case DNS_TYPE_NS: | |
245 | case DNS_TYPE_CNAME: | |
246 | case DNS_TYPE_DNAME: | |
247 | free(rr->ptr.name); | |
248 | break; | |
249 | ||
250 | case DNS_TYPE_HINFO: | |
251 | free(rr->hinfo.cpu); | |
252 | free(rr->hinfo.os); | |
253 | break; | |
254 | ||
255 | case DNS_TYPE_TXT: | |
256 | case DNS_TYPE_SPF: | |
257 | strv_free(rr->txt.strings); | |
258 | break; | |
259 | ||
260 | case DNS_TYPE_SOA: | |
261 | free(rr->soa.mname); | |
262 | free(rr->soa.rname); | |
263 | break; | |
264 | ||
265 | case DNS_TYPE_MX: | |
266 | free(rr->mx.exchange); | |
267 | break; | |
268 | ||
269 | case DNS_TYPE_SSHFP: | |
270 | free(rr->sshfp.key); | |
271 | break; | |
272 | ||
273 | case DNS_TYPE_DNSKEY: | |
274 | free(rr->dnskey.key); | |
275 | break; | |
276 | ||
277 | case DNS_TYPE_LOC: | |
278 | case DNS_TYPE_A: | |
279 | case DNS_TYPE_AAAA: | |
280 | break; | |
281 | ||
282 | default: | |
283 | free(rr->generic.data); | |
284 | } | |
285 | ||
286 | dns_resource_key_unref(rr->key); | |
287 | } | |
288 | ||
289 | free(rr); | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
294 | int dns_resource_record_new_reverse(DnsResourceRecord **ret, int family, const union in_addr_union *address, const char *hostname) { | |
295 | _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; | |
296 | _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; | |
297 | _cleanup_free_ char *ptr = NULL; | |
298 | int r; | |
299 | ||
300 | assert(ret); | |
301 | assert(address); | |
302 | assert(hostname); | |
303 | ||
304 | r = dns_name_reverse(family, address, &ptr); | |
305 | if (r < 0) | |
306 | return r; | |
307 | ||
308 | key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, ptr); | |
309 | if (!key) | |
310 | return -ENOMEM; | |
311 | ||
312 | ptr = NULL; | |
313 | ||
314 | rr = dns_resource_record_new(key); | |
315 | if (!rr) | |
316 | return -ENOMEM; | |
317 | ||
318 | rr->ptr.name = strdup(hostname); | |
319 | if (!rr->ptr.name) | |
320 | return -ENOMEM; | |
321 | ||
322 | *ret = rr; | |
323 | rr = NULL; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) { | |
329 | int r; | |
330 | ||
331 | assert(a); | |
332 | assert(b); | |
333 | ||
334 | r = dns_resource_key_equal(a->key, b->key); | |
335 | if (r <= 0) | |
336 | return r; | |
337 | ||
338 | if (a->unparseable != b->unparseable) | |
339 | return 0; | |
340 | ||
341 | switch (a->unparseable ? _DNS_TYPE_INVALID : a->key->type) { | |
342 | ||
343 | case DNS_TYPE_SRV: | |
344 | r = dns_name_equal(a->srv.name, b->srv.name); | |
345 | if (r <= 0) | |
346 | return r; | |
347 | ||
348 | return a->srv.priority == b->srv.priority && | |
349 | a->srv.weight == b->srv.weight && | |
350 | a->srv.port == b->srv.port; | |
351 | ||
352 | case DNS_TYPE_PTR: | |
353 | case DNS_TYPE_NS: | |
354 | case DNS_TYPE_CNAME: | |
355 | case DNS_TYPE_DNAME: | |
356 | return dns_name_equal(a->ptr.name, b->ptr.name); | |
357 | ||
358 | case DNS_TYPE_HINFO: | |
359 | return strcaseeq(a->hinfo.cpu, b->hinfo.cpu) && | |
360 | strcaseeq(a->hinfo.os, b->hinfo.os); | |
361 | ||
362 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
363 | case DNS_TYPE_TXT: { | |
364 | int i; | |
365 | ||
366 | for (i = 0; a->txt.strings[i] || b->txt.strings[i]; i++) | |
367 | if (!streq_ptr(a->txt.strings[i], b->txt.strings[i])) | |
368 | return false; | |
369 | return true; | |
370 | } | |
371 | ||
372 | case DNS_TYPE_A: | |
373 | return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0; | |
374 | ||
375 | case DNS_TYPE_AAAA: | |
376 | return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0; | |
377 | ||
378 | case DNS_TYPE_SOA: | |
379 | r = dns_name_equal(a->soa.mname, b->soa.mname); | |
380 | if (r <= 0) | |
381 | return r; | |
382 | r = dns_name_equal(a->soa.rname, b->soa.rname); | |
383 | if (r <= 0) | |
384 | return r; | |
385 | ||
386 | return a->soa.serial == b->soa.serial && | |
387 | a->soa.refresh == b->soa.refresh && | |
388 | a->soa.retry == b->soa.retry && | |
389 | a->soa.expire == b->soa.expire && | |
390 | a->soa.minimum == b->soa.minimum; | |
391 | ||
392 | case DNS_TYPE_MX: | |
393 | if (a->mx.priority != b->mx.priority) | |
394 | return 0; | |
395 | ||
396 | return dns_name_equal(a->mx.exchange, b->mx.exchange); | |
397 | ||
398 | case DNS_TYPE_LOC: | |
399 | assert(a->loc.version == b->loc.version); | |
400 | ||
401 | return a->loc.size == b->loc.size && | |
402 | a->loc.horiz_pre == b->loc.horiz_pre && | |
403 | a->loc.vert_pre == b->loc.vert_pre && | |
404 | a->loc.latitude == b->loc.latitude && | |
405 | a->loc.longitude == b->loc.longitude && | |
406 | a->loc.altitude == b->loc.altitude; | |
407 | ||
408 | case DNS_TYPE_SSHFP: | |
409 | return a->sshfp.algorithm == b->sshfp.algorithm && | |
410 | a->sshfp.fptype == b->sshfp.fptype && | |
411 | a->sshfp.key_size == b->sshfp.key_size && | |
412 | memcmp(a->sshfp.key, b->sshfp.key, a->sshfp.key_size) == 0; | |
413 | ||
414 | case DNS_TYPE_DNSKEY: | |
415 | return a->dnskey.zone_key_flag == b->dnskey.zone_key_flag && | |
416 | a->dnskey.sep_flag == b->dnskey.sep_flag && | |
417 | a->dnskey.algorithm == b->dnskey.algorithm && | |
418 | a->dnskey.key_size == b->dnskey.key_size && | |
419 | memcmp(a->dnskey.key, b->dnskey.key, a->dnskey.key_size) == 0; | |
420 | ||
421 | default: | |
422 | return a->generic.size == b->generic.size && | |
423 | memcmp(a->generic.data, b->generic.data, a->generic.size) == 0; | |
424 | } | |
425 | } | |
426 | ||
427 | static char* format_location(uint32_t latitude, uint32_t longitude, uint32_t altitude, | |
428 | uint8_t size, uint8_t horiz_pre, uint8_t vert_pre) { | |
429 | char *s; | |
430 | char NS = latitude >= 1U<<31 ? 'N' : 'S'; | |
431 | char EW = longitude >= 1U<<31 ? 'E' : 'W'; | |
432 | ||
433 | int lat = latitude >= 1U<<31 ? (int) (latitude - (1U<<31)) : (int) ((1U<<31) - latitude); | |
434 | int lon = longitude >= 1U<<31 ? (int) (longitude - (1U<<31)) : (int) ((1U<<31) - longitude); | |
435 | double alt = altitude >= 10000000u ? altitude - 10000000u : -(double)(10000000u - altitude); | |
436 | double siz = (size >> 4) * exp10((double) (size & 0xF)); | |
437 | double hor = (horiz_pre >> 4) * exp10((double) (horiz_pre & 0xF)); | |
438 | double ver = (vert_pre >> 4) * exp10((double) (vert_pre & 0xF)); | |
439 | ||
440 | if (asprintf(&s, "%d %d %.3f %c %d %d %.3f %c %.2fm %.2fm %.2fm %.2fm", | |
441 | (lat / 60000 / 60), | |
442 | (lat / 60000) % 60, | |
443 | (lat % 60000) / 1000., | |
444 | NS, | |
445 | (lon / 60000 / 60), | |
446 | (lon / 60000) % 60, | |
447 | (lon % 60000) / 1000., | |
448 | EW, | |
449 | alt / 100., | |
450 | siz / 100., | |
451 | hor / 100., | |
452 | ver / 100.) < 0) | |
453 | return NULL; | |
454 | ||
455 | return s; | |
456 | } | |
457 | ||
458 | int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) { | |
459 | _cleanup_free_ char *k = NULL, *t = NULL; | |
460 | char *s; | |
461 | int r; | |
462 | ||
463 | assert(rr); | |
464 | ||
465 | r = dns_resource_key_to_string(rr->key, &k); | |
466 | if (r < 0) | |
467 | return r; | |
468 | ||
469 | switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) { | |
470 | ||
471 | case DNS_TYPE_SRV: | |
472 | r = asprintf(&s, "%s %u %u %u %s", | |
473 | k, | |
474 | rr->srv.priority, | |
475 | rr->srv.weight, | |
476 | rr->srv.port, | |
477 | strna(rr->srv.name)); | |
478 | if (r < 0) | |
479 | return -ENOMEM; | |
480 | break; | |
481 | ||
482 | case DNS_TYPE_PTR: | |
483 | case DNS_TYPE_NS: | |
484 | case DNS_TYPE_CNAME: | |
485 | case DNS_TYPE_DNAME: | |
486 | s = strjoin(k, " ", rr->ptr.name, NULL); | |
487 | if (!s) | |
488 | return -ENOMEM; | |
489 | ||
490 | break; | |
491 | ||
492 | case DNS_TYPE_HINFO: | |
493 | s = strjoin(k, " ", rr->hinfo.cpu, " ", rr->hinfo.os, NULL); | |
494 | if (!s) | |
495 | return -ENOMEM; | |
496 | break; | |
497 | ||
498 | case DNS_TYPE_SPF: /* exactly the same as TXT */ | |
499 | case DNS_TYPE_TXT: | |
500 | t = strv_join_quoted(rr->txt.strings); | |
501 | if (!t) | |
502 | return -ENOMEM; | |
503 | ||
504 | s = strjoin(k, " ", t, NULL); | |
505 | if (!s) | |
506 | return -ENOMEM; | |
507 | ||
508 | break; | |
509 | ||
510 | case DNS_TYPE_A: { | |
511 | _cleanup_free_ char *x = NULL; | |
512 | ||
513 | r = in_addr_to_string(AF_INET, (const union in_addr_union*) &rr->a.in_addr, &x); | |
514 | if (r < 0) | |
515 | return r; | |
516 | ||
517 | s = strjoin(k, " ", x, NULL); | |
518 | if (!s) | |
519 | return -ENOMEM; | |
520 | break; | |
521 | } | |
522 | ||
523 | case DNS_TYPE_AAAA: | |
524 | r = in_addr_to_string(AF_INET6, (const union in_addr_union*) &rr->aaaa.in6_addr, &t); | |
525 | if (r < 0) | |
526 | return r; | |
527 | ||
528 | s = strjoin(k, " ", t, NULL); | |
529 | if (!s) | |
530 | return -ENOMEM; | |
531 | break; | |
532 | ||
533 | case DNS_TYPE_SOA: | |
534 | r = asprintf(&s, "%s %s %s %u %u %u %u %u", | |
535 | k, | |
536 | strna(rr->soa.mname), | |
537 | strna(rr->soa.rname), | |
538 | rr->soa.serial, | |
539 | rr->soa.refresh, | |
540 | rr->soa.retry, | |
541 | rr->soa.expire, | |
542 | rr->soa.minimum); | |
543 | if (r < 0) | |
544 | return -ENOMEM; | |
545 | break; | |
546 | ||
547 | case DNS_TYPE_MX: | |
548 | r = asprintf(&s, "%s %u %s", | |
549 | k, | |
550 | rr->mx.priority, | |
551 | rr->mx.exchange); | |
552 | if (r < 0) | |
553 | return -ENOMEM; | |
554 | break; | |
555 | ||
556 | case DNS_TYPE_LOC: | |
557 | assert(rr->loc.version == 0); | |
558 | ||
559 | t = format_location(rr->loc.latitude, | |
560 | rr->loc.longitude, | |
561 | rr->loc.altitude, | |
562 | rr->loc.size, | |
563 | rr->loc.horiz_pre, | |
564 | rr->loc.vert_pre); | |
565 | if (!t) | |
566 | return -ENOMEM; | |
567 | ||
568 | s = strjoin(k, " ", t, NULL); | |
569 | if (!s) | |
570 | return -ENOMEM; | |
571 | break; | |
572 | ||
573 | case DNS_TYPE_SSHFP: | |
574 | t = hexmem(rr->sshfp.key, rr->sshfp.key_size); | |
575 | if (!t) | |
576 | return -ENOMEM; | |
577 | ||
578 | r = asprintf(&s, "%s %u %u %s", | |
579 | k, | |
580 | rr->sshfp.algorithm, | |
581 | rr->sshfp.fptype, | |
582 | t); | |
583 | if (r < 0) | |
584 | return -ENOMEM; | |
585 | break; | |
586 | ||
587 | case DNS_TYPE_DNSKEY: { | |
588 | const char *alg; | |
589 | ||
590 | alg = dnssec_algorithm_to_string(rr->dnskey.algorithm); | |
591 | ||
592 | t = hexmem(rr->dnskey.key, rr->dnskey.key_size); | |
593 | if (!t) | |
594 | return -ENOMEM; | |
595 | ||
596 | r = asprintf(&s, "%s %u 3 %.*s%.*u %s", | |
597 | k, | |
598 | dnskey_to_flags(rr), | |
599 | alg ? -1 : 0, alg, | |
600 | alg ? 0 : 1, alg ? 0u : (unsigned) rr->dnskey.algorithm, | |
601 | t); | |
602 | if (r < 0) | |
603 | return -ENOMEM; | |
604 | break; | |
605 | } | |
606 | ||
607 | default: | |
608 | t = hexmem(rr->generic.data, rr->generic.size); | |
609 | if (!t) | |
610 | return -ENOMEM; | |
611 | ||
612 | s = strjoin(k, " ", t, NULL); | |
613 | if (!s) | |
614 | return -ENOMEM; | |
615 | break; | |
616 | } | |
617 | ||
618 | *ret = s; | |
619 | return 0; | |
620 | } | |
621 | ||
622 | const char *dns_class_to_string(uint16_t class) { | |
623 | ||
624 | switch (class) { | |
625 | ||
626 | case DNS_CLASS_IN: | |
627 | return "IN"; | |
628 | ||
629 | case DNS_CLASS_ANY: | |
630 | return "ANY"; | |
631 | } | |
632 | ||
633 | return NULL; | |
634 | } | |
635 | ||
636 | int dns_class_from_string(const char *s, uint16_t *class) { | |
637 | assert(s); | |
638 | assert(class); | |
639 | ||
640 | if (strcaseeq(s, "IN")) | |
641 | *class = DNS_CLASS_IN; | |
642 | else if (strcaseeq(s, "ANY")) | |
643 | *class = DNS_TYPE_ANY; | |
644 | else | |
645 | return -EINVAL; | |
646 | ||
647 | return 0; | |
648 | } |