summaryrefslogtreecommitdiff
path: root/src/lib/libc/net/getrrsetbyname.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/libc/net/getrrsetbyname.c')
-rw-r--r--src/lib/libc/net/getrrsetbyname.c517
1 files changed, 0 insertions, 517 deletions
diff --git a/src/lib/libc/net/getrrsetbyname.c b/src/lib/libc/net/getrrsetbyname.c
deleted file mode 100644
index 2bbb6ccf83..0000000000
--- a/src/lib/libc/net/getrrsetbyname.c
+++ /dev/null
@@ -1,517 +0,0 @@
1/* $OpenBSD: getrrsetbyname.c,v 1.12 2010/06/29 09:22:06 deraadt 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 <sys/types.h>
47#include <netinet/in.h>
48#include <arpa/nameser.h>
49#include <netdb.h>
50#include <resolv.h>
51#include <stdlib.h>
52#include <string.h>
53
54#include "thread_private.h"
55
56#define MAXPACKET 1024*64
57
58struct dns_query {
59 char *name;
60 u_int16_t type;
61 u_int16_t class;
62 struct dns_query *next;
63};
64
65struct dns_rr {
66 char *name;
67 u_int16_t type;
68 u_int16_t class;
69 u_int16_t ttl;
70 u_int16_t size;
71 void *rdata;
72 struct dns_rr *next;
73};
74
75struct dns_response {
76 HEADER header;
77 struct dns_query *query;
78 struct dns_rr *answer;
79 struct dns_rr *authority;
80 struct dns_rr *additional;
81};
82
83static struct dns_response *parse_dns_response(const u_char *, int);
84static struct dns_query *parse_dns_qsection(const u_char *, int,
85 const u_char **, int);
86static struct dns_rr *parse_dns_rrsection(const u_char *, int, const u_char **,
87 int);
88
89static void free_dns_query(struct dns_query *);
90static void free_dns_rr(struct dns_rr *);
91static void free_dns_response(struct dns_response *);
92
93static int count_dns_rr(struct dns_rr *, u_int16_t, u_int16_t);
94
95int
96getrrsetbyname(const char *hostname, unsigned int rdclass,
97 unsigned int rdtype, unsigned int flags,
98 struct rrsetinfo **res)
99{
100 struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res);
101 int result;
102 struct rrsetinfo *rrset = NULL;
103 struct dns_response *response = NULL;
104 struct dns_rr *rr;
105 struct rdatainfo *rdata;
106 int length;
107 unsigned int index_ans, index_sig;
108 union {
109 HEADER hdr;
110 u_char buf[MAXPACKET];
111 } answer;
112
113 /* check for invalid class and type */
114 if (rdclass > 0xffff || rdtype > 0xffff) {
115 result = ERRSET_INVAL;
116 goto fail;
117 }
118
119 /* don't allow queries of class or type ANY */
120 if (rdclass == 0xff || rdtype == 0xff) {
121 result = ERRSET_INVAL;
122 goto fail;
123 }
124
125 /* don't allow flags yet, unimplemented */
126 if (flags) {
127 result = ERRSET_INVAL;
128 goto fail;
129 }
130
131 /* initialize resolver */
132 if (_res_init(0) == -1) {
133 result = ERRSET_FAIL;
134 goto fail;
135 }
136
137#ifdef DEBUG
138 _resp->options |= RES_DEBUG;
139#endif /* DEBUG */
140
141#ifdef RES_USE_DNSSEC
142 /* turn on DNSSEC if EDNS0 is configured */
143 if (_resp->options & RES_USE_EDNS0)
144 _resp->options |= RES_USE_DNSSEC;
145#endif /* RES_USE_DNSEC */
146
147 /* make query */
148 length = res_query(hostname, (signed int) rdclass, (signed int) rdtype,
149 answer.buf, sizeof(answer.buf));
150 if (length < 0) {
151 switch(h_errno) {
152 case HOST_NOT_FOUND:
153 result = ERRSET_NONAME;
154 goto fail;
155 case NO_DATA:
156 result = ERRSET_NODATA;
157 goto fail;
158 default:
159 result = ERRSET_FAIL;
160 goto fail;
161 }
162 }
163
164 /* parse result */
165 response = parse_dns_response(answer.buf, length);
166 if (response == NULL) {
167 result = ERRSET_FAIL;
168 goto fail;
169 }
170
171 if (response->header.qdcount != 1) {
172 result = ERRSET_FAIL;
173 goto fail;
174 }
175
176 /* initialize rrset */
177 rrset = calloc(1, sizeof(struct rrsetinfo));
178 if (rrset == NULL) {
179 result = ERRSET_NOMEMORY;
180 goto fail;
181 }
182 rrset->rri_rdclass = response->query->class;
183 rrset->rri_rdtype = response->query->type;
184 rrset->rri_ttl = response->answer->ttl;
185 rrset->rri_nrdatas = response->header.ancount;
186
187 /* check for authenticated data */
188 if (response->header.ad == 1)
189 rrset->rri_flags |= RRSET_VALIDATED;
190
191 /* copy name from answer section */
192 rrset->rri_name = strdup(response->answer->name);
193 if (rrset->rri_name == NULL) {
194 result = ERRSET_NOMEMORY;
195 goto fail;
196 }
197
198 /* count answers */
199 rrset->rri_nrdatas = count_dns_rr(response->answer, rrset->rri_rdclass,
200 rrset->rri_rdtype);
201 rrset->rri_nsigs = count_dns_rr(response->answer, rrset->rri_rdclass,
202 T_RRSIG);
203
204 /* allocate memory for answers */
205 rrset->rri_rdatas = calloc(rrset->rri_nrdatas,
206 sizeof(struct rdatainfo));
207 if (rrset->rri_rdatas == NULL) {
208 result = ERRSET_NOMEMORY;
209 goto fail;
210 }
211
212 /* allocate memory for signatures */
213 rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo));
214 if (rrset->rri_sigs == NULL) {
215 result = ERRSET_NOMEMORY;
216 goto fail;
217 }
218
219 /* copy answers & signatures */
220 for (rr = response->answer, index_ans = 0, index_sig = 0;
221 rr; rr = rr->next) {
222
223 rdata = NULL;
224
225 if (rr->class == rrset->rri_rdclass &&
226 rr->type == rrset->rri_rdtype)
227 rdata = &rrset->rri_rdatas[index_ans++];
228
229 if (rr->class == rrset->rri_rdclass &&
230 rr->type == T_RRSIG)
231 rdata = &rrset->rri_sigs[index_sig++];
232
233 if (rdata) {
234 rdata->rdi_length = rr->size;
235 rdata->rdi_data = malloc(rr->size);
236
237 if (rdata->rdi_data == NULL) {
238 result = ERRSET_NOMEMORY;
239 goto fail;
240 }
241 memcpy(rdata->rdi_data, rr->rdata, rr->size);
242 }
243 }
244 free_dns_response(response);
245
246 *res = rrset;
247 return (ERRSET_SUCCESS);
248
249fail:
250 if (rrset != NULL)
251 freerrset(rrset);
252 if (response != NULL)
253 free_dns_response(response);
254 return (result);
255}
256
257void
258freerrset(struct rrsetinfo *rrset)
259{
260 u_int16_t i;
261
262 if (rrset == NULL)
263 return;
264
265 if (rrset->rri_rdatas) {
266 for (i = 0; i < rrset->rri_nrdatas; i++) {
267 if (rrset->rri_rdatas[i].rdi_data == NULL)
268 break;
269 free(rrset->rri_rdatas[i].rdi_data);
270 }
271 free(rrset->rri_rdatas);
272 }
273
274 if (rrset->rri_sigs) {
275 for (i = 0; i < rrset->rri_nsigs; i++) {
276 if (rrset->rri_sigs[i].rdi_data == NULL)
277 break;
278 free(rrset->rri_sigs[i].rdi_data);
279 }
280 free(rrset->rri_sigs);
281 }
282
283 if (rrset->rri_name)
284 free(rrset->rri_name);
285 free(rrset);
286}
287
288/*
289 * DNS response parsing routines
290 */
291static struct dns_response *
292parse_dns_response(const u_char *answer, int size)
293{
294 struct dns_response *resp;
295 const u_char *cp;
296
297 /* allocate memory for the response */
298 resp = calloc(1, sizeof(*resp));
299 if (resp == NULL)
300 return (NULL);
301
302 /* initialize current pointer */
303 cp = answer;
304
305 /* copy header */
306 memcpy(&resp->header, cp, HFIXEDSZ);
307 cp += HFIXEDSZ;
308
309 /* fix header byte order */
310 resp->header.qdcount = ntohs(resp->header.qdcount);
311 resp->header.ancount = ntohs(resp->header.ancount);
312 resp->header.nscount = ntohs(resp->header.nscount);
313 resp->header.arcount = ntohs(resp->header.arcount);
314
315 /* there must be at least one query */
316 if (resp->header.qdcount < 1) {
317 free_dns_response(resp);
318 return (NULL);
319 }
320
321 /* parse query section */
322 resp->query = parse_dns_qsection(answer, size, &cp,
323 resp->header.qdcount);
324 if (resp->header.qdcount && resp->query == NULL) {
325 free_dns_response(resp);
326 return (NULL);
327 }
328
329 /* parse answer section */
330 resp->answer = parse_dns_rrsection(answer, size, &cp,
331 resp->header.ancount);
332 if (resp->header.ancount && resp->answer == NULL) {
333 free_dns_response(resp);
334 return (NULL);
335 }
336
337 /* parse authority section */
338 resp->authority = parse_dns_rrsection(answer, size, &cp,
339 resp->header.nscount);
340 if (resp->header.nscount && resp->authority == NULL) {
341 free_dns_response(resp);
342 return (NULL);
343 }
344
345 /* parse additional section */
346 resp->additional = parse_dns_rrsection(answer, size, &cp,
347 resp->header.arcount);
348 if (resp->header.arcount && resp->additional == NULL) {
349 free_dns_response(resp);
350 return (NULL);
351 }
352
353 return (resp);
354}
355
356static struct dns_query *
357parse_dns_qsection(const u_char *answer, int size, const u_char **cp, int count)
358{
359 struct dns_query *head, *curr, *prev;
360 int i, length;
361 char name[MAXDNAME];
362
363 for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) {
364
365 /* allocate and initialize struct */
366 curr = calloc(1, sizeof(struct dns_query));
367 if (curr == NULL) {
368 free_dns_query(head);
369 return (NULL);
370 }
371 if (head == NULL)
372 head = curr;
373 if (prev != NULL)
374 prev->next = curr;
375
376 /* name */
377 length = dn_expand(answer, answer + size, *cp, name,
378 sizeof(name));
379 if (length < 0) {
380 free_dns_query(head);
381 return (NULL);
382 }
383 curr->name = strdup(name);
384 if (curr->name == NULL) {
385 free_dns_query(head);
386 return (NULL);
387 }
388 *cp += length;
389
390 /* type */
391 curr->type = _getshort(*cp);
392 *cp += INT16SZ;
393
394 /* class */
395 curr->class = _getshort(*cp);
396 *cp += INT16SZ;
397 }
398
399 return (head);
400}
401
402static struct dns_rr *
403parse_dns_rrsection(const u_char *answer, int size, const u_char **cp,
404 int count)
405{
406 struct dns_rr *head, *curr, *prev;
407 int i, length;
408 char name[MAXDNAME];
409
410 for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) {
411
412 /* allocate and initialize struct */
413 curr = calloc(1, sizeof(struct dns_rr));
414 if (curr == NULL) {
415 free_dns_rr(head);
416 return (NULL);
417 }
418 if (head == NULL)
419 head = curr;
420 if (prev != NULL)
421 prev->next = curr;
422
423 /* name */
424 length = dn_expand(answer, answer + size, *cp, name,
425 sizeof(name));
426 if (length < 0) {
427 free_dns_rr(head);
428 return (NULL);
429 }
430 curr->name = strdup(name);
431 if (curr->name == NULL) {
432 free_dns_rr(head);
433 return (NULL);
434 }
435 *cp += length;
436
437 /* type */
438 curr->type = _getshort(*cp);
439 *cp += INT16SZ;
440
441 /* class */
442 curr->class = _getshort(*cp);
443 *cp += INT16SZ;
444
445 /* ttl */
446 curr->ttl = _getlong(*cp);
447 *cp += INT32SZ;
448
449 /* rdata size */
450 curr->size = _getshort(*cp);
451 *cp += INT16SZ;
452
453 /* rdata itself */
454 curr->rdata = malloc(curr->size);
455 if (curr->rdata == NULL) {
456 free_dns_rr(head);
457 return (NULL);
458 }
459 memcpy(curr->rdata, *cp, curr->size);
460 *cp += curr->size;
461 }
462
463 return (head);
464}
465
466static void
467free_dns_query(struct dns_query *p)
468{
469 if (p == NULL)
470 return;
471
472 if (p->name)
473 free(p->name);
474 free_dns_query(p->next);
475 free(p);
476}
477
478static void
479free_dns_rr(struct dns_rr *p)
480{
481 if (p == NULL)
482 return;
483
484 if (p->name)
485 free(p->name);
486 if (p->rdata)
487 free(p->rdata);
488 free_dns_rr(p->next);
489 free(p);
490}
491
492static void
493free_dns_response(struct dns_response *p)
494{
495 if (p == NULL)
496 return;
497
498 free_dns_query(p->query);
499 free_dns_rr(p->answer);
500 free_dns_rr(p->authority);
501 free_dns_rr(p->additional);
502 free(p);
503}
504
505static int
506count_dns_rr(struct dns_rr *p, u_int16_t class, u_int16_t type)
507{
508 int n = 0;
509
510 while(p) {
511 if (p->class == class && p->type == type)
512 n++;
513 p = p->next;
514 }
515
516 return (n);
517}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 13:21:09 +0000