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d74671e4 | 1 | /* OPENBSD ORIGINAL: lib/libc/net/getrrsetbyname.c */ |
2 | ||
ebb049f1 | 3 | /* $OpenBSD: getrrsetbyname.c,v 1.10 2005/03/30 02:58:28 tedu Exp $ */ |
4460d509 | 4 | |
5 | /* | |
6 | * Copyright (c) 2001 Jakob Schlyter. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 | */ | |
30 | ||
31 | /* | |
32 | * Portions Copyright (c) 1999-2001 Internet Software Consortium. | |
33 | * | |
34 | * Permission to use, copy, modify, and distribute this software for any | |
35 | * purpose with or without fee is hereby granted, provided that the above | |
36 | * copyright notice and this permission notice appear in all copies. | |
37 | * | |
38 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM | |
39 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL | |
40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL | |
41 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, | |
42 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING | |
43 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, | |
44 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION | |
45 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
46 | */ | |
47 | ||
48 | #include "includes.h" | |
49 | ||
c31dc31c | 50 | #ifndef HAVE_GETRRSETBYNAME |
4460d509 | 51 | |
52 | #include "getrrsetbyname.h" | |
53 | ||
4d29d2d3 | 54 | #if defined(HAVE_DECL_H_ERRNO) && !HAVE_DECL_H_ERRNO |
41e0e158 | 55 | extern int h_errno; |
56 | #endif | |
57 | ||
ebb049f1 | 58 | /* We don't need multithread support here */ |
59 | #ifdef _THREAD_PRIVATE | |
60 | # undef _THREAD_PRIVATE | |
61 | #endif | |
62 | #define _THREAD_PRIVATE(a,b,c) (c) | |
63 | struct __res_state _res; | |
4460d509 | 64 | |
ebb049f1 | 65 | /* Necessary functions and macros */ |
4460d509 | 66 | |
67 | /* | |
68 | * Inline versions of get/put short/long. Pointer is advanced. | |
69 | * | |
70 | * These macros demonstrate the property of C whereby it can be | |
71 | * portable or it can be elegant but rarely both. | |
72 | */ | |
73 | ||
74 | #ifndef INT32SZ | |
75 | # define INT32SZ 4 | |
76 | #endif | |
77 | #ifndef INT16SZ | |
78 | # define INT16SZ 2 | |
79 | #endif | |
80 | ||
81 | #ifndef GETSHORT | |
82 | #define GETSHORT(s, cp) { \ | |
83 | register u_char *t_cp = (u_char *)(cp); \ | |
84 | (s) = ((u_int16_t)t_cp[0] << 8) \ | |
85 | | ((u_int16_t)t_cp[1]) \ | |
86 | ; \ | |
87 | (cp) += INT16SZ; \ | |
88 | } | |
89 | #endif | |
90 | ||
91 | #ifndef GETLONG | |
92 | #define GETLONG(l, cp) { \ | |
93 | register u_char *t_cp = (u_char *)(cp); \ | |
94 | (l) = ((u_int32_t)t_cp[0] << 24) \ | |
95 | | ((u_int32_t)t_cp[1] << 16) \ | |
96 | | ((u_int32_t)t_cp[2] << 8) \ | |
97 | | ((u_int32_t)t_cp[3]) \ | |
98 | ; \ | |
99 | (cp) += INT32SZ; \ | |
100 | } | |
101 | #endif | |
102 | ||
103 | /* | |
104 | * Routines to insert/extract short/long's. | |
105 | */ | |
106 | ||
252ff4df | 107 | #ifndef HAVE__GETSHORT |
4460d509 | 108 | static u_int16_t |
109 | _getshort(msgp) | |
110 | register const u_char *msgp; | |
111 | { | |
112 | register u_int16_t u; | |
113 | ||
114 | GETSHORT(u, msgp); | |
115 | return (u); | |
116 | } | |
03f5da4c | 117 | #elif defined(HAVE_DECL__GETSHORT) && (HAVE_DECL__GETSHORT == 0) |
118 | u_int16_t _getshort(register const u_char *); | |
252ff4df | 119 | #endif |
4460d509 | 120 | |
252ff4df | 121 | #ifndef HAVE__GETLONG |
4460d509 | 122 | static u_int32_t |
123 | _getlong(msgp) | |
124 | register const u_char *msgp; | |
125 | { | |
126 | register u_int32_t u; | |
127 | ||
128 | GETLONG(u, msgp); | |
129 | return (u); | |
130 | } | |
03f5da4c | 131 | #elif defined(HAVE_DECL__GETLONG) && (HAVE_DECL__GETLONG == 0) |
132 | u_int32_t _getlong(register const u_char *); | |
252ff4df | 133 | #endif |
4460d509 | 134 | |
ebb049f1 | 135 | /* ************** */ |
136 | ||
137 | #define ANSWER_BUFFER_SIZE 1024*64 | |
138 | ||
139 | struct dns_query { | |
140 | char *name; | |
141 | u_int16_t type; | |
142 | u_int16_t class; | |
143 | struct dns_query *next; | |
144 | }; | |
145 | ||
146 | struct dns_rr { | |
147 | char *name; | |
148 | u_int16_t type; | |
149 | u_int16_t class; | |
150 | u_int16_t ttl; | |
151 | u_int16_t size; | |
152 | void *rdata; | |
153 | struct dns_rr *next; | |
154 | }; | |
155 | ||
156 | struct dns_response { | |
157 | HEADER header; | |
158 | struct dns_query *query; | |
159 | struct dns_rr *answer; | |
160 | struct dns_rr *authority; | |
161 | struct dns_rr *additional; | |
162 | }; | |
163 | ||
164 | static struct dns_response *parse_dns_response(const u_char *, int); | |
165 | static struct dns_query *parse_dns_qsection(const u_char *, int, | |
166 | const u_char **, int); | |
167 | static struct dns_rr *parse_dns_rrsection(const u_char *, int, const u_char **, | |
168 | int); | |
169 | ||
170 | static void free_dns_query(struct dns_query *); | |
171 | static void free_dns_rr(struct dns_rr *); | |
172 | static void free_dns_response(struct dns_response *); | |
173 | ||
174 | static int count_dns_rr(struct dns_rr *, u_int16_t, u_int16_t); | |
175 | ||
4460d509 | 176 | int |
177 | getrrsetbyname(const char *hostname, unsigned int rdclass, | |
178 | unsigned int rdtype, unsigned int flags, | |
179 | struct rrsetinfo **res) | |
180 | { | |
ebb049f1 | 181 | struct __res_state *_resp = _THREAD_PRIVATE(_res, _res, &_res); |
4460d509 | 182 | int result; |
183 | struct rrsetinfo *rrset = NULL; | |
ebb049f1 | 184 | struct dns_response *response = NULL; |
4460d509 | 185 | struct dns_rr *rr; |
186 | struct rdatainfo *rdata; | |
bffa6723 | 187 | int length; |
188 | unsigned int index_ans, index_sig; | |
189 | u_char answer[ANSWER_BUFFER_SIZE]; | |
4460d509 | 190 | |
191 | /* check for invalid class and type */ | |
192 | if (rdclass > 0xffff || rdtype > 0xffff) { | |
193 | result = ERRSET_INVAL; | |
194 | goto fail; | |
195 | } | |
196 | ||
197 | /* don't allow queries of class or type ANY */ | |
198 | if (rdclass == 0xff || rdtype == 0xff) { | |
199 | result = ERRSET_INVAL; | |
200 | goto fail; | |
201 | } | |
202 | ||
203 | /* don't allow flags yet, unimplemented */ | |
204 | if (flags) { | |
205 | result = ERRSET_INVAL; | |
206 | goto fail; | |
207 | } | |
208 | ||
209 | /* initialize resolver */ | |
ebb049f1 | 210 | if ((_resp->options & RES_INIT) == 0 && res_init() == -1) { |
4460d509 | 211 | result = ERRSET_FAIL; |
212 | goto fail; | |
213 | } | |
214 | ||
215 | #ifdef DEBUG | |
ebb049f1 | 216 | _resp->options |= RES_DEBUG; |
4460d509 | 217 | #endif /* DEBUG */ |
218 | ||
219 | #ifdef RES_USE_DNSSEC | |
220 | /* turn on DNSSEC if EDNS0 is configured */ | |
ebb049f1 | 221 | if (_resp->options & RES_USE_EDNS0) |
222 | _resp->options |= RES_USE_DNSSEC; | |
4460d509 | 223 | #endif /* RES_USE_DNSEC */ |
224 | ||
225 | /* make query */ | |
bffa6723 | 226 | length = res_query(hostname, (signed int) rdclass, (signed int) rdtype, |
227 | answer, sizeof(answer)); | |
4460d509 | 228 | if (length < 0) { |
229 | switch(h_errno) { | |
230 | case HOST_NOT_FOUND: | |
231 | result = ERRSET_NONAME; | |
232 | goto fail; | |
233 | case NO_DATA: | |
234 | result = ERRSET_NODATA; | |
235 | goto fail; | |
236 | default: | |
237 | result = ERRSET_FAIL; | |
238 | goto fail; | |
239 | } | |
240 | } | |
241 | ||
242 | /* parse result */ | |
243 | response = parse_dns_response(answer, length); | |
244 | if (response == NULL) { | |
245 | result = ERRSET_FAIL; | |
246 | goto fail; | |
247 | } | |
248 | ||
249 | if (response->header.qdcount != 1) { | |
250 | result = ERRSET_FAIL; | |
251 | goto fail; | |
252 | } | |
253 | ||
254 | /* initialize rrset */ | |
255 | rrset = calloc(1, sizeof(struct rrsetinfo)); | |
256 | if (rrset == NULL) { | |
257 | result = ERRSET_NOMEMORY; | |
258 | goto fail; | |
259 | } | |
260 | rrset->rri_rdclass = response->query->class; | |
261 | rrset->rri_rdtype = response->query->type; | |
262 | rrset->rri_ttl = response->answer->ttl; | |
263 | rrset->rri_nrdatas = response->header.ancount; | |
264 | ||
265 | /* check for authenticated data */ | |
266 | if (response->header.ad == 1) | |
267 | rrset->rri_flags |= RRSET_VALIDATED; | |
268 | ||
269 | /* copy name from answer section */ | |
ebb049f1 | 270 | rrset->rri_name = strdup(response->answer->name); |
4460d509 | 271 | if (rrset->rri_name == NULL) { |
272 | result = ERRSET_NOMEMORY; | |
273 | goto fail; | |
274 | } | |
4460d509 | 275 | |
276 | /* count answers */ | |
277 | rrset->rri_nrdatas = count_dns_rr(response->answer, rrset->rri_rdclass, | |
278 | rrset->rri_rdtype); | |
279 | rrset->rri_nsigs = count_dns_rr(response->answer, rrset->rri_rdclass, | |
280 | T_SIG); | |
281 | ||
282 | /* allocate memory for answers */ | |
283 | rrset->rri_rdatas = calloc(rrset->rri_nrdatas, | |
284 | sizeof(struct rdatainfo)); | |
285 | if (rrset->rri_rdatas == NULL) { | |
286 | result = ERRSET_NOMEMORY; | |
287 | goto fail; | |
288 | } | |
289 | ||
290 | /* allocate memory for signatures */ | |
291 | rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo)); | |
ebb049f1 | 292 | if (rrset->rri_sigs == NULL) { |
4460d509 | 293 | result = ERRSET_NOMEMORY; |
294 | goto fail; | |
295 | } | |
296 | ||
297 | /* copy answers & signatures */ | |
298 | for (rr = response->answer, index_ans = 0, index_sig = 0; | |
299 | rr; rr = rr->next) { | |
300 | ||
301 | rdata = NULL; | |
302 | ||
303 | if (rr->class == rrset->rri_rdclass && | |
304 | rr->type == rrset->rri_rdtype) | |
305 | rdata = &rrset->rri_rdatas[index_ans++]; | |
306 | ||
307 | if (rr->class == rrset->rri_rdclass && | |
308 | rr->type == T_SIG) | |
309 | rdata = &rrset->rri_sigs[index_sig++]; | |
310 | ||
311 | if (rdata) { | |
312 | rdata->rdi_length = rr->size; | |
313 | rdata->rdi_data = malloc(rr->size); | |
314 | ||
315 | if (rdata->rdi_data == NULL) { | |
316 | result = ERRSET_NOMEMORY; | |
317 | goto fail; | |
318 | } | |
319 | memcpy(rdata->rdi_data, rr->rdata, rr->size); | |
320 | } | |
321 | } | |
ebb049f1 | 322 | free_dns_response(response); |
4460d509 | 323 | |
324 | *res = rrset; | |
325 | return (ERRSET_SUCCESS); | |
326 | ||
327 | fail: | |
328 | if (rrset != NULL) | |
329 | freerrset(rrset); | |
ebb049f1 | 330 | if (response != NULL) |
331 | free_dns_response(response); | |
4460d509 | 332 | return (result); |
333 | } | |
334 | ||
335 | void | |
336 | freerrset(struct rrsetinfo *rrset) | |
337 | { | |
338 | u_int16_t i; | |
339 | ||
340 | if (rrset == NULL) | |
341 | return; | |
342 | ||
343 | if (rrset->rri_rdatas) { | |
344 | for (i = 0; i < rrset->rri_nrdatas; i++) { | |
345 | if (rrset->rri_rdatas[i].rdi_data == NULL) | |
346 | break; | |
347 | free(rrset->rri_rdatas[i].rdi_data); | |
348 | } | |
349 | free(rrset->rri_rdatas); | |
350 | } | |
351 | ||
352 | if (rrset->rri_sigs) { | |
353 | for (i = 0; i < rrset->rri_nsigs; i++) { | |
354 | if (rrset->rri_sigs[i].rdi_data == NULL) | |
355 | break; | |
356 | free(rrset->rri_sigs[i].rdi_data); | |
357 | } | |
358 | free(rrset->rri_sigs); | |
359 | } | |
360 | ||
361 | if (rrset->rri_name) | |
362 | free(rrset->rri_name); | |
363 | free(rrset); | |
364 | } | |
365 | ||
366 | /* | |
367 | * DNS response parsing routines | |
368 | */ | |
369 | static struct dns_response * | |
bffa6723 | 370 | parse_dns_response(const u_char *answer, int size) |
4460d509 | 371 | { |
372 | struct dns_response *resp; | |
bffa6723 | 373 | const u_char *cp; |
4460d509 | 374 | |
375 | /* allocate memory for the response */ | |
376 | resp = calloc(1, sizeof(*resp)); | |
377 | if (resp == NULL) | |
378 | return (NULL); | |
379 | ||
380 | /* initialize current pointer */ | |
381 | cp = answer; | |
382 | ||
383 | /* copy header */ | |
384 | memcpy(&resp->header, cp, HFIXEDSZ); | |
385 | cp += HFIXEDSZ; | |
386 | ||
387 | /* fix header byte order */ | |
388 | resp->header.qdcount = ntohs(resp->header.qdcount); | |
389 | resp->header.ancount = ntohs(resp->header.ancount); | |
390 | resp->header.nscount = ntohs(resp->header.nscount); | |
391 | resp->header.arcount = ntohs(resp->header.arcount); | |
392 | ||
393 | /* there must be at least one query */ | |
394 | if (resp->header.qdcount < 1) { | |
395 | free_dns_response(resp); | |
396 | return (NULL); | |
397 | } | |
398 | ||
399 | /* parse query section */ | |
400 | resp->query = parse_dns_qsection(answer, size, &cp, | |
401 | resp->header.qdcount); | |
402 | if (resp->header.qdcount && resp->query == NULL) { | |
403 | free_dns_response(resp); | |
404 | return (NULL); | |
405 | } | |
406 | ||
407 | /* parse answer section */ | |
408 | resp->answer = parse_dns_rrsection(answer, size, &cp, | |
409 | resp->header.ancount); | |
410 | if (resp->header.ancount && resp->answer == NULL) { | |
411 | free_dns_response(resp); | |
412 | return (NULL); | |
413 | } | |
414 | ||
415 | /* parse authority section */ | |
416 | resp->authority = parse_dns_rrsection(answer, size, &cp, | |
417 | resp->header.nscount); | |
418 | if (resp->header.nscount && resp->authority == NULL) { | |
419 | free_dns_response(resp); | |
420 | return (NULL); | |
421 | } | |
422 | ||
423 | /* parse additional section */ | |
424 | resp->additional = parse_dns_rrsection(answer, size, &cp, | |
425 | resp->header.arcount); | |
426 | if (resp->header.arcount && resp->additional == NULL) { | |
427 | free_dns_response(resp); | |
428 | return (NULL); | |
429 | } | |
430 | ||
431 | return (resp); | |
432 | } | |
433 | ||
434 | static struct dns_query * | |
bffa6723 | 435 | parse_dns_qsection(const u_char *answer, int size, const u_char **cp, int count) |
4460d509 | 436 | { |
437 | struct dns_query *head, *curr, *prev; | |
438 | int i, length; | |
439 | char name[MAXDNAME]; | |
440 | ||
441 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | |
442 | ||
443 | /* allocate and initialize struct */ | |
444 | curr = calloc(1, sizeof(struct dns_query)); | |
445 | if (curr == NULL) { | |
446 | free_dns_query(head); | |
447 | return (NULL); | |
448 | } | |
449 | if (head == NULL) | |
450 | head = curr; | |
451 | if (prev != NULL) | |
452 | prev->next = curr; | |
453 | ||
454 | /* name */ | |
455 | length = dn_expand(answer, answer + size, *cp, name, | |
456 | sizeof(name)); | |
457 | if (length < 0) { | |
458 | free_dns_query(head); | |
459 | return (NULL); | |
460 | } | |
461 | curr->name = strdup(name); | |
462 | if (curr->name == NULL) { | |
463 | free_dns_query(head); | |
464 | return (NULL); | |
465 | } | |
466 | *cp += length; | |
467 | ||
468 | /* type */ | |
469 | curr->type = _getshort(*cp); | |
470 | *cp += INT16SZ; | |
471 | ||
472 | /* class */ | |
473 | curr->class = _getshort(*cp); | |
474 | *cp += INT16SZ; | |
475 | } | |
476 | ||
477 | return (head); | |
478 | } | |
479 | ||
480 | static struct dns_rr * | |
ebb049f1 | 481 | parse_dns_rrsection(const u_char *answer, int size, const u_char **cp, |
482 | int count) | |
4460d509 | 483 | { |
484 | struct dns_rr *head, *curr, *prev; | |
485 | int i, length; | |
486 | char name[MAXDNAME]; | |
487 | ||
488 | for (i = 1, head = NULL, prev = NULL; i <= count; i++, prev = curr) { | |
489 | ||
490 | /* allocate and initialize struct */ | |
491 | curr = calloc(1, sizeof(struct dns_rr)); | |
492 | if (curr == NULL) { | |
493 | free_dns_rr(head); | |
494 | return (NULL); | |
495 | } | |
496 | if (head == NULL) | |
497 | head = curr; | |
498 | if (prev != NULL) | |
499 | prev->next = curr; | |
500 | ||
501 | /* name */ | |
502 | length = dn_expand(answer, answer + size, *cp, name, | |
503 | sizeof(name)); | |
504 | if (length < 0) { | |
505 | free_dns_rr(head); | |
506 | return (NULL); | |
507 | } | |
508 | curr->name = strdup(name); | |
509 | if (curr->name == NULL) { | |
510 | free_dns_rr(head); | |
511 | return (NULL); | |
512 | } | |
513 | *cp += length; | |
514 | ||
515 | /* type */ | |
516 | curr->type = _getshort(*cp); | |
517 | *cp += INT16SZ; | |
518 | ||
519 | /* class */ | |
520 | curr->class = _getshort(*cp); | |
521 | *cp += INT16SZ; | |
522 | ||
523 | /* ttl */ | |
524 | curr->ttl = _getlong(*cp); | |
525 | *cp += INT32SZ; | |
526 | ||
527 | /* rdata size */ | |
528 | curr->size = _getshort(*cp); | |
529 | *cp += INT16SZ; | |
530 | ||
531 | /* rdata itself */ | |
532 | curr->rdata = malloc(curr->size); | |
533 | if (curr->rdata == NULL) { | |
534 | free_dns_rr(head); | |
535 | return (NULL); | |
536 | } | |
537 | memcpy(curr->rdata, *cp, curr->size); | |
538 | *cp += curr->size; | |
539 | } | |
540 | ||
541 | return (head); | |
542 | } | |
543 | ||
544 | static void | |
545 | free_dns_query(struct dns_query *p) | |
546 | { | |
547 | if (p == NULL) | |
548 | return; | |
549 | ||
550 | if (p->name) | |
551 | free(p->name); | |
552 | free_dns_query(p->next); | |
553 | free(p); | |
554 | } | |
555 | ||
556 | static void | |
557 | free_dns_rr(struct dns_rr *p) | |
558 | { | |
559 | if (p == NULL) | |
560 | return; | |
561 | ||
562 | if (p->name) | |
563 | free(p->name); | |
564 | if (p->rdata) | |
565 | free(p->rdata); | |
566 | free_dns_rr(p->next); | |
567 | free(p); | |
568 | } | |
569 | ||
570 | static void | |
571 | free_dns_response(struct dns_response *p) | |
572 | { | |
573 | if (p == NULL) | |
574 | return; | |
575 | ||
576 | free_dns_query(p->query); | |
577 | free_dns_rr(p->answer); | |
578 | free_dns_rr(p->authority); | |
579 | free_dns_rr(p->additional); | |
580 | free(p); | |
581 | } | |
582 | ||
583 | static int | |
584 | count_dns_rr(struct dns_rr *p, u_int16_t class, u_int16_t type) | |
585 | { | |
586 | int n = 0; | |
587 | ||
588 | while(p) { | |
589 | if (p->class == class && p->type == type) | |
590 | n++; | |
591 | p = p->next; | |
592 | } | |
593 | ||
594 | return (n); | |
595 | } | |
596 | ||
c369b7c3 | 597 | #endif /* !defined(HAVE_GETRRSETBYNAME) */ |