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ebb049f1 | 1 | /* $OpenBSD: getrrsetbyname.c,v 1.10 2005/03/30 02:58:28 tedu Exp $ */ |
4460d509 | 2 | |
3 | /* | |
4 | * Copyright (c) 2001 Jakob Schlyter. All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | */ | |
28 | ||
29 | /* | |
30 | * Portions Copyright (c) 1999-2001 Internet Software Consortium. | |
31 | * | |
32 | * Permission to use, copy, modify, and distribute this software for any | |
33 | * purpose with or without fee is hereby granted, provided that the above | |
34 | * copyright notice and this permission notice appear in all copies. | |
35 | * | |
36 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM | |
37 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL | |
38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL | |
39 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, | |
40 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING | |
41 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, | |
42 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION | |
43 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
44 | */ | |
45 | ||
f6d4fb87 | 46 | /* OPENBSD ORIGINAL: lib/libc/net/getrrsetbyname.c */ |
47 | ||
4460d509 | 48 | #include "includes.h" |
49 | ||
c31dc31c | 50 | #ifndef HAVE_GETRRSETBYNAME |
4460d509 | 51 | |
76e03684 | 52 | #include <stdlib.h> |
28cb0a43 | 53 | #include <string.h> |
54 | ||
5e837c7b | 55 | #include <netinet/in.h> |
56 | #include <arpa/inet.h> | |
57 | ||
4460d509 | 58 | #include "getrrsetbyname.h" |
59 | ||
4d29d2d3 | 60 | #if defined(HAVE_DECL_H_ERRNO) && !HAVE_DECL_H_ERRNO |
41e0e158 | 61 | extern int h_errno; |
62 | #endif | |
63 | ||
ebb049f1 | 64 | /* We don't need multithread support here */ |
65 | #ifdef _THREAD_PRIVATE | |
66 | # undef _THREAD_PRIVATE | |
67 | #endif | |
68 | #define _THREAD_PRIVATE(a,b,c) (c) | |
a048aeba | 69 | |
70 | /* to avoid conflicts where a platform already has _res */ | |
0bbb4f75 | 71 | #ifdef _res |
72 | # undef _res | |
73 | #endif | |
a048aeba | 74 | #define _res _compat_res |
75 | ||
ebb049f1 | 76 | struct __res_state _res; |
4460d509 | 77 | |
ebb049f1 | 78 | /* Necessary functions and macros */ |
4460d509 | 79 | |
80 | /* | |
81 | * Inline versions of get/put short/long. Pointer is advanced. | |
82 | * | |
83 | * These macros demonstrate the property of C whereby it can be | |
84 | * portable or it can be elegant but rarely both. | |
85 | */ | |
86 | ||
87 | #ifndef INT32SZ | |
88 | # define INT32SZ 4 | |
89 | #endif | |
90 | #ifndef INT16SZ | |
91 | # define INT16SZ 2 | |
92 | #endif | |
93 | ||
94 | #ifndef GETSHORT | |
95 | #define GETSHORT(s, cp) { \ | |
96 | register u_char *t_cp = (u_char *)(cp); \ | |
97 | (s) = ((u_int16_t)t_cp[0] << 8) \ | |
98 | | ((u_int16_t)t_cp[1]) \ | |
99 | ; \ | |
100 | (cp) += INT16SZ; \ | |
101 | } | |
102 | #endif | |
103 | ||
104 | #ifndef GETLONG | |
105 | #define GETLONG(l, cp) { \ | |
106 | register u_char *t_cp = (u_char *)(cp); \ | |
107 | (l) = ((u_int32_t)t_cp[0] << 24) \ | |
108 | | ((u_int32_t)t_cp[1] << 16) \ | |
109 | | ((u_int32_t)t_cp[2] << 8) \ | |
110 | | ((u_int32_t)t_cp[3]) \ | |
111 | ; \ | |
112 | (cp) += INT32SZ; \ | |
113 | } | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * Routines to insert/extract short/long's. | |
118 | */ | |
119 | ||
252ff4df | 120 | #ifndef HAVE__GETSHORT |
4460d509 | 121 | static u_int16_t |
122 | _getshort(msgp) | |
123 | register const u_char *msgp; | |
124 | { | |
125 | register u_int16_t u; | |
126 | ||
127 | GETSHORT(u, msgp); | |
128 | return (u); | |
129 | } | |
03f5da4c | 130 | #elif defined(HAVE_DECL__GETSHORT) && (HAVE_DECL__GETSHORT == 0) |
131 | u_int16_t _getshort(register const u_char *); | |
252ff4df | 132 | #endif |
4460d509 | 133 | |
252ff4df | 134 | #ifndef HAVE__GETLONG |
4460d509 | 135 | static u_int32_t |
136 | _getlong(msgp) | |
137 | register const u_char *msgp; | |
138 | { | |
139 | register u_int32_t u; | |
140 | ||
141 | GETLONG(u, msgp); | |
142 | return (u); | |
143 | } | |
03f5da4c | 144 | #elif defined(HAVE_DECL__GETLONG) && (HAVE_DECL__GETLONG == 0) |
145 | u_int32_t _getlong(register const u_char *); | |
252ff4df | 146 | #endif |
4460d509 | 147 | |
ebb049f1 | 148 | /* ************** */ |
149 | ||
150 | #define ANSWER_BUFFER_SIZE 1024*64 | |
151 | ||
152 | struct dns_query { | |
153 | char *name; | |
154 | u_int16_t type; | |
155 | u_int16_t class; | |
156 | struct dns_query *next; | |
157 | }; | |
158 | ||
159 | struct dns_rr { | |
160 | char *name; | |
161 | u_int16_t type; | |
162 | u_int16_t class; | |
163 | u_int16_t ttl; | |
164 | u_int16_t size; | |
165 | void *rdata; | |
166 | struct dns_rr *next; | |
167 | }; | |
168 | ||
169 | struct dns_response { | |
170 | HEADER header; | |
171 | struct dns_query *query; | |
172 | struct dns_rr *answer; | |
173 | struct dns_rr *authority; | |
174 | struct dns_rr *additional; | |
175 | }; | |
176 | ||
177 | static struct dns_response *parse_dns_response(const u_char *, int); | |
178 | static struct dns_query *parse_dns_qsection(const u_char *, int, | |
179 | const u_char **, int); | |
180 | static struct dns_rr *parse_dns_rrsection(const u_char *, int, const u_char **, | |
181 | int); | |
182 | ||
183 | static void free_dns_query(struct dns_query *); | |
184 | static void free_dns_rr(struct dns_rr *); | |
185 | static void free_dns_response(struct dns_response *); | |
186 | ||
187 | static int count_dns_rr(struct dns_rr *, u_int16_t, u_int16_t); | |
188 | ||
4460d509 | 189 | int |
190 | getrrsetbyname(const char *hostname, unsigned int rdclass, | |
191 | unsigned int rdtype, unsigned int flags, | |
192 | struct rrsetinfo **res) | |
193 | { | |
ebb049f1 | 194 | struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res); |
4460d509 | 195 | int result; |
196 | struct rrsetinfo *rrset = NULL; | |
ebb049f1 | 197 | struct dns_response *response = NULL; |
4460d509 | 198 | struct dns_rr *rr; |
199 | struct rdatainfo *rdata; | |
bffa6723 | 200 | int length; |
201 | unsigned int index_ans, index_sig; | |
202 | u_char answer[ANSWER_BUFFER_SIZE]; | |
4460d509 | 203 | |
204 | /* check for invalid class and type */ | |
205 | if (rdclass > 0xffff || rdtype > 0xffff) { | |
206 | result = ERRSET_INVAL; | |
207 | goto fail; | |
208 | } | |
209 | ||
210 | /* don't allow queries of class or type ANY */ | |
211 | if (rdclass == 0xff || rdtype == 0xff) { | |
212 | result = ERRSET_INVAL; | |
213 | goto fail; | |
214 | } | |
215 | ||
216 | /* don't allow flags yet, unimplemented */ | |
217 | if (flags) { | |
218 | result = ERRSET_INVAL; | |
219 | goto fail; | |
220 | } | |
221 | ||
222 | /* initialize resolver */ | |
ebb049f1 | 223 | if ((_resp->options & RES_INIT) == 0 && res_init() == -1) { |
4460d509 | 224 | result = ERRSET_FAIL; |
225 | goto fail; | |
226 | } | |
227 | ||
228 | #ifdef DEBUG | |
ebb049f1 | 229 | _resp->options |= RES_DEBUG; |
4460d509 | 230 | #endif /* DEBUG */ |
231 | ||
232 | #ifdef RES_USE_DNSSEC | |
233 | /* turn on DNSSEC if EDNS0 is configured */ | |
ebb049f1 | 234 | if (_resp->options & RES_USE_EDNS0) |
235 | _resp->options |= RES_USE_DNSSEC; | |
4460d509 | 236 | #endif /* RES_USE_DNSEC */ |
237 | ||
238 | /* make query */ | |
bffa6723 | 239 | length = res_query(hostname, (signed int) rdclass, (signed int) rdtype, |
240 | answer, sizeof(answer)); | |
4460d509 | 241 | if (length < 0) { |
242 | switch(h_errno) { | |
243 | case HOST_NOT_FOUND: | |
244 | result = ERRSET_NONAME; | |
245 | goto fail; | |
246 | case NO_DATA: | |
247 | result = ERRSET_NODATA; | |
248 | goto fail; | |
249 | default: | |
250 | result = ERRSET_FAIL; | |
251 | goto fail; | |
252 | } | |
253 | } | |
254 | ||
255 | /* parse result */ | |
256 | response = parse_dns_response(answer, length); | |
257 | if (response == NULL) { | |
258 | result = ERRSET_FAIL; | |
259 | goto fail; | |
260 | } | |
261 | ||
262 | if (response->header.qdcount != 1) { | |
263 | result = ERRSET_FAIL; | |
264 | goto fail; | |
265 | } | |
266 | ||
267 | /* initialize rrset */ | |
268 | rrset = calloc(1, sizeof(struct rrsetinfo)); | |
269 | if (rrset == NULL) { | |
270 | result = ERRSET_NOMEMORY; | |
271 | goto fail; | |
272 | } | |
273 | rrset->rri_rdclass = response->query->class; | |
274 | rrset->rri_rdtype = response->query->type; | |
275 | rrset->rri_ttl = response->answer->ttl; | |
276 | rrset->rri_nrdatas = response->header.ancount; | |
277 | ||
4162eae5 | 278 | #ifdef HAVE_HEADER_AD |
4460d509 | 279 | /* check for authenticated data */ |
280 | if (response->header.ad == 1) | |
281 | rrset->rri_flags |= RRSET_VALIDATED; | |
4162eae5 | 282 | #endif |
4460d509 | 283 | |
284 | /* copy name from answer section */ | |
ebb049f1 | 285 | rrset->rri_name = strdup(response->answer->name); |
4460d509 | 286 | if (rrset->rri_name == NULL) { |
287 | result = ERRSET_NOMEMORY; | |
288 | goto fail; | |
289 | } | |
4460d509 | 290 | |
291 | /* count answers */ | |
292 | rrset->rri_nrdatas = count_dns_rr(response->answer, rrset->rri_rdclass, | |
293 | rrset->rri_rdtype); | |
294 | rrset->rri_nsigs = count_dns_rr(response->answer, rrset->rri_rdclass, | |
295 | T_SIG); | |
296 | ||
297 | /* allocate memory for answers */ | |
298 | rrset->rri_rdatas = calloc(rrset->rri_nrdatas, | |
299 | sizeof(struct rdatainfo)); | |
300 | if (rrset->rri_rdatas == NULL) { | |
301 | result = ERRSET_NOMEMORY; | |
302 | goto fail; | |
303 | } | |
304 | ||
305 | /* allocate memory for signatures */ | |
306 | rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo)); | |
ebb049f1 | 307 | if (rrset->rri_sigs == NULL) { |
4460d509 | 308 | result = ERRSET_NOMEMORY; |
309 | goto fail; | |
310 | } | |
311 | ||
312 | /* copy answers & signatures */ | |
313 | for (rr = response->answer, index_ans = 0, index_sig = 0; | |
314 | rr; rr = rr->next) { | |
315 | ||
316 | rdata = NULL; | |
317 | ||
318 | if (rr->class == rrset->rri_rdclass && | |
319 | rr->type == rrset->rri_rdtype) | |
320 | rdata = &rrset->rri_rdatas[index_ans++]; | |
321 | ||
322 | if (rr->class == rrset->rri_rdclass && | |
323 | rr->type == T_SIG) | |
324 | rdata = &rrset->rri_sigs[index_sig++]; | |
325 | ||
326 | if (rdata) { | |
327 | rdata->rdi_length = rr->size; | |
328 | rdata->rdi_data = malloc(rr->size); | |
329 | ||
330 | if (rdata->rdi_data == NULL) { | |
331 | result = ERRSET_NOMEMORY; | |
332 | goto fail; | |
333 | } | |
334 | memcpy(rdata->rdi_data, rr->rdata, rr->size); | |
335 | } | |
336 | } | |
ebb049f1 | 337 | free_dns_response(response); |
4460d509 | 338 | |
339 | *res = rrset; | |
340 | return (ERRSET_SUCCESS); | |
341 | ||
342 | fail: | |
343 | if (rrset != NULL) | |
344 | freerrset(rrset); | |
ebb049f1 | 345 | if (response != NULL) |
346 | free_dns_response(response); | |
4460d509 | 347 | return (result); |
348 | } | |
349 | ||
350 | void | |
351 | freerrset(struct rrsetinfo *rrset) | |
352 | { | |
353 | u_int16_t i; | |
354 | ||
355 | if (rrset == NULL) | |
356 | return; | |
357 | ||
358 | if (rrset->rri_rdatas) { | |
359 | for (i = 0; i < rrset->rri_nrdatas; i++) { | |
360 | if (rrset->rri_rdatas[i].rdi_data == NULL) | |
361 | break; | |
362 | free(rrset->rri_rdatas[i].rdi_data); | |
363 | } | |
364 | free(rrset->rri_rdatas); | |
365 | } | |
366 | ||
367 | if (rrset->rri_sigs) { | |
368 | for (i = 0; i < rrset->rri_nsigs; i++) { | |
369 | if (rrset->rri_sigs[i].rdi_data == NULL) | |
370 | break; | |
371 | free(rrset->rri_sigs[i].rdi_data); | |
372 | } | |
373 | free(rrset->rri_sigs); | |
374 | } | |
375 | ||
376 | if (rrset->rri_name) | |
377 | free(rrset->rri_name); | |
378 | free(rrset); | |
379 | } | |
380 | ||
381 | /* | |
382 | * DNS response parsing routines | |
383 | */ | |
384 | static struct dns_response * | |
bffa6723 | 385 | parse_dns_response(const u_char *answer, int size) |
4460d509 | 386 | { |
387 | struct dns_response *resp; | |
bffa6723 | 388 | const u_char *cp; |
4460d509 | 389 | |
390 | /* allocate memory for the response */ | |
391 | resp = calloc(1, sizeof(*resp)); | |
392 | if (resp == NULL) | |
393 | return (NULL); | |
394 | ||
395 | /* initialize current pointer */ | |
396 | cp = answer; | |
397 | ||
398 | /* copy header */ | |
399 | memcpy(&resp->header, cp, HFIXEDSZ); | |
400 | cp += HFIXEDSZ; | |
401 | ||
402 | /* fix header byte order */ | |
403 | resp->header.qdcount = ntohs(resp->header.qdcount); | |
404 | resp->header.ancount = ntohs(resp->header.ancount); | |
405 | resp->header.nscount = ntohs(resp->header.nscount); | |
406 | resp->header.arcount = ntohs(resp->header.arcount); | |
407 | ||
408 | /* there must be at least one query */ | |
409 | if (resp->header.qdcount < 1) { | |
410 | free_dns_response(resp); | |
411 | return (NULL); | |
412 | } | |
413 | ||
414 | /* parse query section */ | |
415 | resp->query = parse_dns_qsection(answer, size, &cp, | |
416 | resp->header.qdcount); | |
417 | if (resp->header.qdcount && resp->query == NULL) { | |
418 | free_dns_response(resp); | |
419 | return (NULL); | |
420 | } | |
421 | ||
422 | /* parse answer section */ | |
423 | resp->answer = parse_dns_rrsection(answer, size, &cp, | |
424 | resp->header.ancount); | |
425 | if (resp->header.ancount && resp->answer == NULL) { | |
426 | free_dns_response(resp); | |
427 | return (NULL); | |
428 | } | |
429 | ||
430 | /* parse authority section */ | |
431 | resp->authority = parse_dns_rrsection(answer, size, &cp, | |
432 | resp->header.nscount); | |
433 | if (resp->header.nscount && resp->authority == NULL) { | |
434 | free_dns_response(resp); | |
435 | return (NULL); | |
436 | } | |
437 | ||
438 | /* parse additional section */ | |
439 | resp->additional = parse_dns_rrsection(answer, size, &cp, | |
440 | resp->header.arcount); | |
441 | if (resp->header.arcount && resp->additional == NULL) { | |
442 | free_dns_response(resp); | |
443 | return (NULL); | |
444 | } | |
445 | ||
446 | return (resp); | |
447 | } | |
448 | ||
449 | static struct dns_query * | |
bffa6723 | 450 | parse_dns_qsection(const u_char *answer, int size, const u_char **cp, int count) |
4460d509 | 451 | { |
452 | struct dns_query *head, *curr, *prev; | |
453 | int i, length; | |
454 | char name[MAXDNAME]; | |
455 | ||
456 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | |
457 | ||
458 | /* allocate and initialize struct */ | |
459 | curr = calloc(1, sizeof(struct dns_query)); | |
460 | if (curr == NULL) { | |
461 | free_dns_query(head); | |
462 | return (NULL); | |
463 | } | |
464 | if (head == NULL) | |
465 | head = curr; | |
466 | if (prev != NULL) | |
467 | prev->next = curr; | |
468 | ||
469 | /* name */ | |
470 | length = dn_expand(answer, answer + size, *cp, name, | |
471 | sizeof(name)); | |
472 | if (length < 0) { | |
473 | free_dns_query(head); | |
474 | return (NULL); | |
475 | } | |
476 | curr->name = strdup(name); | |
477 | if (curr->name == NULL) { | |
478 | free_dns_query(head); | |
479 | return (NULL); | |
480 | } | |
481 | *cp += length; | |
482 | ||
483 | /* type */ | |
484 | curr->type = _getshort(*cp); | |
485 | *cp += INT16SZ; | |
486 | ||
487 | /* class */ | |
488 | curr->class = _getshort(*cp); | |
489 | *cp += INT16SZ; | |
490 | } | |
491 | ||
492 | return (head); | |
493 | } | |
494 | ||
495 | static struct dns_rr * | |
ebb049f1 | 496 | parse_dns_rrsection(const u_char *answer, int size, const u_char **cp, |
497 | int count) | |
4460d509 | 498 | { |
499 | struct dns_rr *head, *curr, *prev; | |
500 | int i, length; | |
501 | char name[MAXDNAME]; | |
502 | ||
503 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | |
504 | ||
505 | /* allocate and initialize struct */ | |
506 | curr = calloc(1, sizeof(struct dns_rr)); | |
507 | if (curr == NULL) { | |
508 | free_dns_rr(head); | |
509 | return (NULL); | |
510 | } | |
511 | if (head == NULL) | |
512 | head = curr; | |
513 | if (prev != NULL) | |
514 | prev->next = curr; | |
515 | ||
516 | /* name */ | |
517 | length = dn_expand(answer, answer + size, *cp, name, | |
518 | sizeof(name)); | |
519 | if (length < 0) { | |
520 | free_dns_rr(head); | |
521 | return (NULL); | |
522 | } | |
523 | curr->name = strdup(name); | |
524 | if (curr->name == NULL) { | |
525 | free_dns_rr(head); | |
526 | return (NULL); | |
527 | } | |
528 | *cp += length; | |
529 | ||
530 | /* type */ | |
531 | curr->type = _getshort(*cp); | |
532 | *cp += INT16SZ; | |
533 | ||
534 | /* class */ | |
535 | curr->class = _getshort(*cp); | |
536 | *cp += INT16SZ; | |
537 | ||
538 | /* ttl */ | |
539 | curr->ttl = _getlong(*cp); | |
540 | *cp += INT32SZ; | |
541 | ||
542 | /* rdata size */ | |
543 | curr->size = _getshort(*cp); | |
544 | *cp += INT16SZ; | |
545 | ||
546 | /* rdata itself */ | |
547 | curr->rdata = malloc(curr->size); | |
548 | if (curr->rdata == NULL) { | |
549 | free_dns_rr(head); | |
550 | return (NULL); | |
551 | } | |
552 | memcpy(curr->rdata, *cp, curr->size); | |
553 | *cp += curr->size; | |
554 | } | |
555 | ||
556 | return (head); | |
557 | } | |
558 | ||
559 | static void | |
560 | free_dns_query(struct dns_query *p) | |
561 | { | |
562 | if (p == NULL) | |
563 | return; | |
564 | ||
565 | if (p->name) | |
566 | free(p->name); | |
567 | free_dns_query(p->next); | |
568 | free(p); | |
569 | } | |
570 | ||
571 | static void | |
572 | free_dns_rr(struct dns_rr *p) | |
573 | { | |
574 | if (p == NULL) | |
575 | return; | |
576 | ||
577 | if (p->name) | |
578 | free(p->name); | |
579 | if (p->rdata) | |
580 | free(p->rdata); | |
581 | free_dns_rr(p->next); | |
582 | free(p); | |
583 | } | |
584 | ||
585 | static void | |
586 | free_dns_response(struct dns_response *p) | |
587 | { | |
588 | if (p == NULL) | |
589 | return; | |
590 | ||
591 | free_dns_query(p->query); | |
592 | free_dns_rr(p->answer); | |
593 | free_dns_rr(p->authority); | |
594 | free_dns_rr(p->additional); | |
595 | free(p); | |
596 | } | |
597 | ||
598 | static int | |
599 | count_dns_rr(struct dns_rr *p, u_int16_t class, u_int16_t type) | |
600 | { | |
601 | int n = 0; | |
602 | ||
603 | while(p) { | |
604 | if (p->class == class && p->type == type) | |
605 | n++; | |
606 | p = p->next; | |
607 | } | |
608 | ||
609 | return (n); | |
610 | } | |
611 | ||
c369b7c3 | 612 | #endif /* !defined(HAVE_GETRRSETBYNAME) */ |