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