diff options
Diffstat (limited to 'openbsd-compat/getrrsetbyname.c')
-rw-r--r-- | openbsd-compat/getrrsetbyname.c | 567 |
1 files changed, 567 insertions, 0 deletions
diff --git a/openbsd-compat/getrrsetbyname.c b/openbsd-compat/getrrsetbyname.c new file mode 100644 index 000000000..03637c9ef --- /dev/null +++ b/openbsd-compat/getrrsetbyname.c | |||
@@ -0,0 +1,567 @@ | |||
1 | /* $OpenBSD: getrrsetbyname.c,v 1.4 2001/08/16 18:16:43 ho Exp $ */ | ||
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 | |||
46 | #include "includes.h" | ||
47 | |||
48 | #ifndef HAVE_GETRRSETBYNAME | ||
49 | |||
50 | #include "getrrsetbyname.h" | ||
51 | |||
52 | #define ANSWER_BUFFER_SIZE 1024*64 | ||
53 | |||
54 | struct dns_query { | ||
55 | char *name; | ||
56 | u_int16_t type; | ||
57 | u_int16_t class; | ||
58 | struct dns_query *next; | ||
59 | }; | ||
60 | |||
61 | struct dns_rr { | ||
62 | char *name; | ||
63 | u_int16_t type; | ||
64 | u_int16_t class; | ||
65 | u_int16_t ttl; | ||
66 | u_int16_t size; | ||
67 | void *rdata; | ||
68 | struct dns_rr *next; | ||
69 | }; | ||
70 | |||
71 | struct dns_response { | ||
72 | HEADER header; | ||
73 | struct dns_query *query; | ||
74 | struct dns_rr *answer; | ||
75 | struct dns_rr *authority; | ||
76 | struct dns_rr *additional; | ||
77 | }; | ||
78 | |||
79 | static struct dns_response *parse_dns_response(const char *, int); | ||
80 | static struct dns_query *parse_dns_qsection(const char *, int, const char **, | ||
81 | int); | ||
82 | static struct dns_rr *parse_dns_rrsection(const char *, int, const char **, | ||
83 | int); | ||
84 | |||
85 | static void free_dns_query(struct dns_query *); | ||
86 | static void free_dns_rr(struct dns_rr *); | ||
87 | static void free_dns_response(struct dns_response *); | ||
88 | |||
89 | static int count_dns_rr(struct dns_rr *, u_int16_t, u_int16_t); | ||
90 | |||
91 | /* | ||
92 | * Inline versions of get/put short/long. Pointer is advanced. | ||
93 | * | ||
94 | * These macros demonstrate the property of C whereby it can be | ||
95 | * portable or it can be elegant but rarely both. | ||
96 | */ | ||
97 | |||
98 | #ifndef INT32SZ | ||
99 | # define INT32SZ 4 | ||
100 | #endif | ||
101 | #ifndef INT16SZ | ||
102 | # define INT16SZ 2 | ||
103 | #endif | ||
104 | |||
105 | #ifndef GETSHORT | ||
106 | #define GETSHORT(s, cp) { \ | ||
107 | register u_char *t_cp = (u_char *)(cp); \ | ||
108 | (s) = ((u_int16_t)t_cp[0] << 8) \ | ||
109 | | ((u_int16_t)t_cp[1]) \ | ||
110 | ; \ | ||
111 | (cp) += INT16SZ; \ | ||
112 | } | ||
113 | #endif | ||
114 | |||
115 | #ifndef GETLONG | ||
116 | #define GETLONG(l, cp) { \ | ||
117 | register u_char *t_cp = (u_char *)(cp); \ | ||
118 | (l) = ((u_int32_t)t_cp[0] << 24) \ | ||
119 | | ((u_int32_t)t_cp[1] << 16) \ | ||
120 | | ((u_int32_t)t_cp[2] << 8) \ | ||
121 | | ((u_int32_t)t_cp[3]) \ | ||
122 | ; \ | ||
123 | (cp) += INT32SZ; \ | ||
124 | } | ||
125 | #endif | ||
126 | |||
127 | /* | ||
128 | * Routines to insert/extract short/long's. | ||
129 | */ | ||
130 | |||
131 | static u_int16_t | ||
132 | _getshort(msgp) | ||
133 | register const u_char *msgp; | ||
134 | { | ||
135 | register u_int16_t u; | ||
136 | |||
137 | GETSHORT(u, msgp); | ||
138 | return (u); | ||
139 | } | ||
140 | |||
141 | static u_int32_t | ||
142 | _getlong(msgp) | ||
143 | register const u_char *msgp; | ||
144 | { | ||
145 | register u_int32_t u; | ||
146 | |||
147 | GETLONG(u, msgp); | ||
148 | return (u); | ||
149 | } | ||
150 | |||
151 | int | ||
152 | getrrsetbyname(const char *hostname, unsigned int rdclass, | ||
153 | unsigned int rdtype, unsigned int flags, | ||
154 | struct rrsetinfo **res) | ||
155 | { | ||
156 | int result; | ||
157 | struct rrsetinfo *rrset = NULL; | ||
158 | struct dns_response *response; | ||
159 | struct dns_rr *rr; | ||
160 | struct rdatainfo *rdata; | ||
161 | unsigned int length, index_ans, index_sig; | ||
162 | char answer[ANSWER_BUFFER_SIZE]; | ||
163 | |||
164 | /* check for invalid class and type */ | ||
165 | if (rdclass > 0xffff || rdtype > 0xffff) { | ||
166 | result = ERRSET_INVAL; | ||
167 | goto fail; | ||
168 | } | ||
169 | |||
170 | /* don't allow queries of class or type ANY */ | ||
171 | if (rdclass == 0xff || rdtype == 0xff) { | ||
172 | result = ERRSET_INVAL; | ||
173 | goto fail; | ||
174 | } | ||
175 | |||
176 | /* don't allow flags yet, unimplemented */ | ||
177 | if (flags) { | ||
178 | result = ERRSET_INVAL; | ||
179 | goto fail; | ||
180 | } | ||
181 | |||
182 | /* initialize resolver */ | ||
183 | if ((_res.options & RES_INIT) == 0 && res_init() == -1) { | ||
184 | result = ERRSET_FAIL; | ||
185 | goto fail; | ||
186 | } | ||
187 | |||
188 | #ifdef DEBUG | ||
189 | _res.options |= RES_DEBUG; | ||
190 | #endif /* DEBUG */ | ||
191 | |||
192 | #ifdef RES_USE_DNSSEC | ||
193 | /* turn on DNSSEC if EDNS0 is configured */ | ||
194 | if (_res.options & RES_USE_EDNS0) | ||
195 | _res.options |= RES_USE_DNSSEC; | ||
196 | #endif /* RES_USE_DNSEC */ | ||
197 | |||
198 | /* make query */ | ||
199 | length = res_query(hostname, rdclass, rdtype, answer, sizeof(answer)); | ||
200 | if (length < 0) { | ||
201 | switch(h_errno) { | ||
202 | case HOST_NOT_FOUND: | ||
203 | result = ERRSET_NONAME; | ||
204 | goto fail; | ||
205 | case NO_DATA: | ||
206 | result = ERRSET_NODATA; | ||
207 | goto fail; | ||
208 | default: | ||
209 | result = ERRSET_FAIL; | ||
210 | goto fail; | ||
211 | } | ||
212 | } | ||
213 | |||
214 | /* parse result */ | ||
215 | response = parse_dns_response(answer, length); | ||
216 | if (response == NULL) { | ||
217 | result = ERRSET_FAIL; | ||
218 | goto fail; | ||
219 | } | ||
220 | |||
221 | if (response->header.qdcount != 1) { | ||
222 | result = ERRSET_FAIL; | ||
223 | goto fail; | ||
224 | } | ||
225 | |||
226 | /* initialize rrset */ | ||
227 | rrset = calloc(1, sizeof(struct rrsetinfo)); | ||
228 | if (rrset == NULL) { | ||
229 | result = ERRSET_NOMEMORY; | ||
230 | goto fail; | ||
231 | } | ||
232 | rrset->rri_rdclass = response->query->class; | ||
233 | rrset->rri_rdtype = response->query->type; | ||
234 | rrset->rri_ttl = response->answer->ttl; | ||
235 | rrset->rri_nrdatas = response->header.ancount; | ||
236 | |||
237 | /* check for authenticated data */ | ||
238 | if (response->header.ad == 1) | ||
239 | rrset->rri_flags |= RRSET_VALIDATED; | ||
240 | |||
241 | /* copy name from answer section */ | ||
242 | length = strlen(response->answer->name); | ||
243 | rrset->rri_name = malloc(length + 1); | ||
244 | if (rrset->rri_name == NULL) { | ||
245 | result = ERRSET_NOMEMORY; | ||
246 | goto fail; | ||
247 | } | ||
248 | strlcpy(rrset->rri_name, response->answer->name, length + 1); | ||
249 | |||
250 | /* count answers */ | ||
251 | rrset->rri_nrdatas = count_dns_rr(response->answer, rrset->rri_rdclass, | ||
252 | rrset->rri_rdtype); | ||
253 | rrset->rri_nsigs = count_dns_rr(response->answer, rrset->rri_rdclass, | ||
254 | T_SIG); | ||
255 | |||
256 | /* allocate memory for answers */ | ||
257 | rrset->rri_rdatas = calloc(rrset->rri_nrdatas, | ||
258 | sizeof(struct rdatainfo)); | ||
259 | if (rrset->rri_rdatas == NULL) { | ||
260 | result = ERRSET_NOMEMORY; | ||
261 | goto fail; | ||
262 | } | ||
263 | |||
264 | /* allocate memory for signatures */ | ||
265 | rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo)); | ||
266 | if (rrset->rri_sigs == NULL) { | ||
267 | result = ERRSET_NOMEMORY; | ||
268 | goto fail; | ||
269 | } | ||
270 | |||
271 | /* copy answers & signatures */ | ||
272 | for (rr = response->answer, index_ans = 0, index_sig = 0; | ||
273 | rr; rr = rr->next) { | ||
274 | |||
275 | rdata = NULL; | ||
276 | |||
277 | if (rr->class == rrset->rri_rdclass && | ||
278 | rr->type == rrset->rri_rdtype) | ||
279 | rdata = &rrset->rri_rdatas[index_ans++]; | ||
280 | |||
281 | if (rr->class == rrset->rri_rdclass && | ||
282 | rr->type == T_SIG) | ||
283 | rdata = &rrset->rri_sigs[index_sig++]; | ||
284 | |||
285 | if (rdata) { | ||
286 | rdata->rdi_length = rr->size; | ||
287 | rdata->rdi_data = malloc(rr->size); | ||
288 | |||
289 | if (rdata->rdi_data == NULL) { | ||
290 | result = ERRSET_NOMEMORY; | ||
291 | goto fail; | ||
292 | } | ||
293 | memcpy(rdata->rdi_data, rr->rdata, rr->size); | ||
294 | } | ||
295 | } | ||
296 | |||
297 | *res = rrset; | ||
298 | return (ERRSET_SUCCESS); | ||
299 | |||
300 | fail: | ||
301 | if (rrset != NULL) | ||
302 | freerrset(rrset); | ||
303 | return (result); | ||
304 | } | ||
305 | |||
306 | void | ||
307 | freerrset(struct rrsetinfo *rrset) | ||
308 | { | ||
309 | u_int16_t i; | ||
310 | |||
311 | if (rrset == NULL) | ||
312 | return; | ||
313 | |||
314 | if (rrset->rri_rdatas) { | ||
315 | for (i = 0; i < rrset->rri_nrdatas; i++) { | ||
316 | if (rrset->rri_rdatas[i].rdi_data == NULL) | ||
317 | break; | ||
318 | free(rrset->rri_rdatas[i].rdi_data); | ||
319 | } | ||
320 | free(rrset->rri_rdatas); | ||
321 | } | ||
322 | |||
323 | if (rrset->rri_sigs) { | ||
324 | for (i = 0; i < rrset->rri_nsigs; i++) { | ||
325 | if (rrset->rri_sigs[i].rdi_data == NULL) | ||
326 | break; | ||
327 | free(rrset->rri_sigs[i].rdi_data); | ||
328 | } | ||
329 | free(rrset->rri_sigs); | ||
330 | } | ||
331 | |||
332 | if (rrset->rri_name) | ||
333 | free(rrset->rri_name); | ||
334 | free(rrset); | ||
335 | } | ||
336 | |||
337 | /* | ||
338 | * DNS response parsing routines | ||
339 | */ | ||
340 | static struct dns_response * | ||
341 | parse_dns_response(const char *answer, int size) | ||
342 | { | ||
343 | struct dns_response *resp; | ||
344 | const char *cp; | ||
345 | |||
346 | /* allocate memory for the response */ | ||
347 | resp = calloc(1, sizeof(*resp)); | ||
348 | if (resp == NULL) | ||
349 | return (NULL); | ||
350 | |||
351 | /* initialize current pointer */ | ||
352 | cp = answer; | ||
353 | |||
354 | /* copy header */ | ||
355 | memcpy(&resp->header, cp, HFIXEDSZ); | ||
356 | cp += HFIXEDSZ; | ||
357 | |||
358 | /* fix header byte order */ | ||
359 | resp->header.qdcount = ntohs(resp->header.qdcount); | ||
360 | resp->header.ancount = ntohs(resp->header.ancount); | ||
361 | resp->header.nscount = ntohs(resp->header.nscount); | ||
362 | resp->header.arcount = ntohs(resp->header.arcount); | ||
363 | |||
364 | /* there must be at least one query */ | ||
365 | if (resp->header.qdcount < 1) { | ||
366 | free_dns_response(resp); | ||
367 | return (NULL); | ||
368 | } | ||
369 | |||
370 | /* parse query section */ | ||
371 | resp->query = parse_dns_qsection(answer, size, &cp, | ||
372 | resp->header.qdcount); | ||
373 | if (resp->header.qdcount && resp->query == NULL) { | ||
374 | free_dns_response(resp); | ||
375 | return (NULL); | ||
376 | } | ||
377 | |||
378 | /* parse answer section */ | ||
379 | resp->answer = parse_dns_rrsection(answer, size, &cp, | ||
380 | resp->header.ancount); | ||
381 | if (resp->header.ancount && resp->answer == NULL) { | ||
382 | free_dns_response(resp); | ||
383 | return (NULL); | ||
384 | } | ||
385 | |||
386 | /* parse authority section */ | ||
387 | resp->authority = parse_dns_rrsection(answer, size, &cp, | ||
388 | resp->header.nscount); | ||
389 | if (resp->header.nscount && resp->authority == NULL) { | ||
390 | free_dns_response(resp); | ||
391 | return (NULL); | ||
392 | } | ||
393 | |||
394 | /* parse additional section */ | ||
395 | resp->additional = parse_dns_rrsection(answer, size, &cp, | ||
396 | resp->header.arcount); | ||
397 | if (resp->header.arcount && resp->additional == NULL) { | ||
398 | free_dns_response(resp); | ||
399 | return (NULL); | ||
400 | } | ||
401 | |||
402 | return (resp); | ||
403 | } | ||
404 | |||
405 | static struct dns_query * | ||
406 | parse_dns_qsection(const char *answer, int size, const char **cp, int count) | ||
407 | { | ||
408 | struct dns_query *head, *curr, *prev; | ||
409 | int i, length; | ||
410 | char name[MAXDNAME]; | ||
411 | |||
412 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | ||
413 | |||
414 | /* allocate and initialize struct */ | ||
415 | curr = calloc(1, sizeof(struct dns_query)); | ||
416 | if (curr == NULL) { | ||
417 | free_dns_query(head); | ||
418 | return (NULL); | ||
419 | } | ||
420 | if (head == NULL) | ||
421 | head = curr; | ||
422 | if (prev != NULL) | ||
423 | prev->next = curr; | ||
424 | |||
425 | /* name */ | ||
426 | length = dn_expand(answer, answer + size, *cp, name, | ||
427 | sizeof(name)); | ||
428 | if (length < 0) { | ||
429 | free_dns_query(head); | ||
430 | return (NULL); | ||
431 | } | ||
432 | curr->name = strdup(name); | ||
433 | if (curr->name == NULL) { | ||
434 | free_dns_query(head); | ||
435 | return (NULL); | ||
436 | } | ||
437 | *cp += length; | ||
438 | |||
439 | /* type */ | ||
440 | curr->type = _getshort(*cp); | ||
441 | *cp += INT16SZ; | ||
442 | |||
443 | /* class */ | ||
444 | curr->class = _getshort(*cp); | ||
445 | *cp += INT16SZ; | ||
446 | } | ||
447 | |||
448 | return (head); | ||
449 | } | ||
450 | |||
451 | static struct dns_rr * | ||
452 | parse_dns_rrsection(const char *answer, int size, const char **cp, int count) | ||
453 | { | ||
454 | struct dns_rr *head, *curr, *prev; | ||
455 | int i, length; | ||
456 | char name[MAXDNAME]; | ||
457 | |||
458 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | ||
459 | |||
460 | /* allocate and initialize struct */ | ||
461 | curr = calloc(1, sizeof(struct dns_rr)); | ||
462 | if (curr == NULL) { | ||
463 | free_dns_rr(head); | ||
464 | return (NULL); | ||
465 | } | ||
466 | if (head == NULL) | ||
467 | head = curr; | ||
468 | if (prev != NULL) | ||
469 | prev->next = curr; | ||
470 | |||
471 | /* name */ | ||
472 | length = dn_expand(answer, answer + size, *cp, name, | ||
473 | sizeof(name)); | ||
474 | if (length < 0) { | ||
475 | free_dns_rr(head); | ||
476 | return (NULL); | ||
477 | } | ||
478 | curr->name = strdup(name); | ||
479 | if (curr->name == NULL) { | ||
480 | free_dns_rr(head); | ||
481 | return (NULL); | ||
482 | } | ||
483 | *cp += length; | ||
484 | |||
485 | /* type */ | ||
486 | curr->type = _getshort(*cp); | ||
487 | *cp += INT16SZ; | ||
488 | |||
489 | /* class */ | ||
490 | curr->class = _getshort(*cp); | ||
491 | *cp += INT16SZ; | ||
492 | |||
493 | /* ttl */ | ||
494 | curr->ttl = _getlong(*cp); | ||
495 | *cp += INT32SZ; | ||
496 | |||
497 | /* rdata size */ | ||
498 | curr->size = _getshort(*cp); | ||
499 | *cp += INT16SZ; | ||
500 | |||
501 | /* rdata itself */ | ||
502 | curr->rdata = malloc(curr->size); | ||
503 | if (curr->rdata == NULL) { | ||
504 | free_dns_rr(head); | ||
505 | return (NULL); | ||
506 | } | ||
507 | memcpy(curr->rdata, *cp, curr->size); | ||
508 | *cp += curr->size; | ||
509 | } | ||
510 | |||
511 | return (head); | ||
512 | } | ||
513 | |||
514 | static void | ||
515 | free_dns_query(struct dns_query *p) | ||
516 | { | ||
517 | if (p == NULL) | ||
518 | return; | ||
519 | |||
520 | if (p->name) | ||
521 | free(p->name); | ||
522 | free_dns_query(p->next); | ||
523 | free(p); | ||
524 | } | ||
525 | |||
526 | static void | ||
527 | free_dns_rr(struct dns_rr *p) | ||
528 | { | ||
529 | if (p == NULL) | ||
530 | return; | ||
531 | |||
532 | if (p->name) | ||
533 | free(p->name); | ||
534 | if (p->rdata) | ||
535 | free(p->rdata); | ||
536 | free_dns_rr(p->next); | ||
537 | free(p); | ||
538 | } | ||
539 | |||
540 | static void | ||
541 | free_dns_response(struct dns_response *p) | ||
542 | { | ||
543 | if (p == NULL) | ||
544 | return; | ||
545 | |||
546 | free_dns_query(p->query); | ||
547 | free_dns_rr(p->answer); | ||
548 | free_dns_rr(p->authority); | ||
549 | free_dns_rr(p->additional); | ||
550 | free(p); | ||
551 | } | ||
552 | |||
553 | static int | ||
554 | count_dns_rr(struct dns_rr *p, u_int16_t class, u_int16_t type) | ||
555 | { | ||
556 | int n = 0; | ||
557 | |||
558 | while(p) { | ||
559 | if (p->class == class && p->type == type) | ||
560 | n++; | ||
561 | p = p->next; | ||
562 | } | ||
563 | |||
564 | return (n); | ||
565 | } | ||
566 | |||
567 | #endif /* HAVE_GETRRSETBYNAME */ | ||