1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * ++Copyright++ 1985, 1988, 1993
5 * -
6 * Copyright (c) 1985, 1988, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 * -
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34 *
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * SOFTWARE.
50 * -
51 * --Copyright--
52 */
53
54 #include <sys/param.h>
55 #include <sys/socket.h>
56 #include <netinet/in.h>
57 #include <arpa/inet.h>
58 #include <arpa/nameser.h>
59
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <unistd.h>
63 #include <string.h>
64 #include <netdb.h>
65 #include <resolv.h>
66 #include <ctype.h>
67 #include <errno.h>
68 #include <syslog.h>
69 #include <stdarg.h>
70 #include <nsswitch.h>
71
72 #include "netdb_private.h"
73 #include "res_config.h"
74
75 #define SPRINTF(x) ((size_t)sprintf x)
76
77 static const char AskedForGot[] =
78 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";
79
80 #ifdef RESOLVSORT
81 static void addrsort(char **, int, res_state);
82 #endif
83
84 #ifdef DEBUG
85 static void dbg_printf(char *, int, res_state) __printflike(1, 0);
86 #endif
87
88 #define MAXPACKET (64*1024)
89
90 typedef union {
91 HEADER hdr;
92 u_char buf[MAXPACKET];
93 } querybuf;
94
95 typedef union {
96 int32_t al;
97 char ac;
98 } align;
99
100 int _dns_ttl_;
101
102 #ifdef DEBUG
103 static void
dbg_printf(char * msg,int num,res_state res)104 dbg_printf(char *msg, int num, res_state res)
105 {
106 if (res->options & RES_DEBUG) {
107 int save = errno;
108
109 printf(msg, num);
110 errno = save;
111 }
112 }
113 #else
114 # define dbg_printf(msg, num, res) /*nada*/
115 #endif
116
117 #define BOUNDED_INCR(x) \
118 do { \
119 cp += x; \
120 if (cp > eom) { \
121 RES_SET_H_ERRNO(statp, NO_RECOVERY); \
122 return (-1); \
123 } \
124 } while (0)
125
126 #define BOUNDS_CHECK(ptr, count) \
127 do { \
128 if ((ptr) + (count) > eom) { \
129 RES_SET_H_ERRNO(statp, NO_RECOVERY); \
130 return (-1); \
131 } \
132 } while (0)
133
134 static int
gethostanswer(const querybuf * answer,int anslen,const char * qname,int qtype,struct hostent * he,struct hostent_data * hed,res_state statp)135 gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
136 struct hostent *he, struct hostent_data *hed, res_state statp)
137 {
138 const HEADER *hp;
139 const u_char *cp;
140 int n;
141 const u_char *eom, *erdata;
142 char *bp, *ep, **ap, **hap;
143 int type, class, ancount, qdcount;
144 int haveanswer, had_error;
145 int toobig = 0;
146 char tbuf[MAXDNAME];
147 const char *tname;
148 int (*name_ok)(const char *);
149
150 tname = qname;
151 he->h_name = NULL;
152 eom = answer->buf + anslen;
153 switch (qtype) {
154 case T_A:
155 case T_AAAA:
156 name_ok = res_hnok;
157 break;
158 case T_PTR:
159 name_ok = res_dnok;
160 break;
161 default:
162 RES_SET_H_ERRNO(statp, NO_RECOVERY);
163 return (-1); /* XXX should be abort(); */
164 }
165 /*
166 * find first satisfactory answer
167 */
168 hp = &answer->hdr;
169 ancount = ntohs(hp->ancount);
170 qdcount = ntohs(hp->qdcount);
171 bp = hed->hostbuf;
172 ep = hed->hostbuf + sizeof hed->hostbuf;
173 cp = answer->buf;
174 BOUNDED_INCR(HFIXEDSZ);
175 if (qdcount != 1) {
176 RES_SET_H_ERRNO(statp, NO_RECOVERY);
177 return (-1);
178 }
179 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
180 if ((n < 0) || !(*name_ok)(bp)) {
181 RES_SET_H_ERRNO(statp, NO_RECOVERY);
182 return (-1);
183 }
184 BOUNDED_INCR(n + QFIXEDSZ);
185 if (qtype == T_A || qtype == T_AAAA) {
186 /* res_send() has already verified that the query name is the
187 * same as the one we sent; this just gets the expanded name
188 * (i.e., with the succeeding search-domain tacked on).
189 */
190 n = strlen(bp) + 1; /* for the \0 */
191 if (n >= MAXHOSTNAMELEN) {
192 RES_SET_H_ERRNO(statp, NO_RECOVERY);
193 return (-1);
194 }
195 he->h_name = bp;
196 bp += n;
197 /* The qname can be abbreviated, but h_name is now absolute. */
198 qname = he->h_name;
199 }
200 ap = hed->host_aliases;
201 *ap = NULL;
202 he->h_aliases = hed->host_aliases;
203 hap = hed->h_addr_ptrs;
204 *hap = NULL;
205 he->h_addr_list = hed->h_addr_ptrs;
206 haveanswer = 0;
207 had_error = 0;
208 _dns_ttl_ = -1;
209 while (ancount-- > 0 && cp < eom && !had_error) {
210 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
211 if ((n < 0) || !(*name_ok)(bp)) {
212 had_error++;
213 continue;
214 }
215 cp += n; /* name */
216 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
217 type = _getshort(cp);
218 cp += INT16SZ; /* type */
219 class = _getshort(cp);
220 cp += INT16SZ; /* class */
221 if (qtype == T_A && type == T_A)
222 _dns_ttl_ = _getlong(cp);
223 cp += INT32SZ; /* TTL */
224 n = _getshort(cp);
225 cp += INT16SZ; /* len */
226 BOUNDS_CHECK(cp, n);
227 erdata = cp + n;
228 if (class != C_IN) {
229 /* XXX - debug? syslog? */
230 cp += n;
231 continue; /* XXX - had_error++ ? */
232 }
233 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
234 if (ap >= &hed->host_aliases[_MAXALIASES-1])
235 continue;
236 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
237 if ((n < 0) || !(*name_ok)(tbuf)) {
238 had_error++;
239 continue;
240 }
241 cp += n;
242 if (cp != erdata) {
243 RES_SET_H_ERRNO(statp, NO_RECOVERY);
244 return (-1);
245 }
246 /* Store alias. */
247 *ap++ = bp;
248 n = strlen(bp) + 1; /* for the \0 */
249 if (n >= MAXHOSTNAMELEN) {
250 had_error++;
251 continue;
252 }
253 bp += n;
254 /* Get canonical name. */
255 n = strlen(tbuf) + 1; /* for the \0 */
256 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
257 had_error++;
258 continue;
259 }
260 strcpy(bp, tbuf);
261 he->h_name = bp;
262 bp += n;
263 continue;
264 }
265 if (qtype == T_PTR && type == T_CNAME) {
266 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
267 if (n < 0 || !res_dnok(tbuf)) {
268 had_error++;
269 continue;
270 }
271 cp += n;
272 if (cp != erdata) {
273 RES_SET_H_ERRNO(statp, NO_RECOVERY);
274 return (-1);
275 }
276 /* Get canonical name. */
277 n = strlen(tbuf) + 1; /* for the \0 */
278 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
279 had_error++;
280 continue;
281 }
282 strcpy(bp, tbuf);
283 tname = bp;
284 bp += n;
285 continue;
286 }
287 if (type != qtype) {
288 #ifdef DEBUG
289 if (type != T_KEY && type != T_SIG &&
290 type != T_DNAME && type != T_RRSIG)
291 syslog(LOG_NOTICE|LOG_AUTH,
292 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",
293 qname, p_class(C_IN), p_type(qtype),
294 p_type(type));
295 #endif
296 cp += n;
297 continue; /* XXX - had_error++ ? */
298 }
299 switch (type) {
300 case T_PTR:
301 if (strcasecmp(tname, bp) != 0) {
302 syslog(LOG_NOTICE|LOG_AUTH,
303 AskedForGot, qname, bp);
304 cp += n;
305 continue; /* XXX - had_error++ ? */
306 }
307 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
308 if ((n < 0) || !res_hnok(bp)) {
309 had_error++;
310 break;
311 }
312 #if MULTI_PTRS_ARE_ALIASES
313 cp += n;
314 if (cp != erdata) {
315 RES_SET_H_ERRNO(statp, NO_RECOVERY);
316 return (-1);
317 }
318 if (!haveanswer)
319 he->h_name = bp;
320 else if (ap < &hed->host_aliases[_MAXALIASES-1])
321 *ap++ = bp;
322 else
323 n = -1;
324 if (n != -1) {
325 n = strlen(bp) + 1; /* for the \0 */
326 if (n >= MAXHOSTNAMELEN) {
327 had_error++;
328 break;
329 }
330 bp += n;
331 }
332 break;
333 #else
334 he->h_name = bp;
335 if (statp->options & RES_USE_INET6) {
336 n = strlen(bp) + 1; /* for the \0 */
337 if (n >= MAXHOSTNAMELEN) {
338 had_error++;
339 break;
340 }
341 bp += n;
342 _map_v4v6_hostent(he, &bp, ep);
343 }
344 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
345 return (0);
346 #endif
347 case T_A:
348 case T_AAAA:
349 if (strcasecmp(he->h_name, bp) != 0) {
350 syslog(LOG_NOTICE|LOG_AUTH,
351 AskedForGot, he->h_name, bp);
352 cp += n;
353 continue; /* XXX - had_error++ ? */
354 }
355 if (n != he->h_length) {
356 cp += n;
357 continue;
358 }
359 if (!haveanswer) {
360 int nn;
361
362 he->h_name = bp;
363 nn = strlen(bp) + 1; /* for the \0 */
364 bp += nn;
365 }
366
367 bp += sizeof(align) - ((u_long)bp % sizeof(align));
368
369 if (bp + n >= ep) {
370 dbg_printf("size (%d) too big\n", n, statp);
371 had_error++;
372 continue;
373 }
374 if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) {
375 if (!toobig++)
376 dbg_printf("Too many addresses (%d)\n",
377 _MAXADDRS, statp);
378 cp += n;
379 continue;
380 }
381 memcpy(*hap++ = bp, cp, n);
382 bp += n;
383 cp += n;
384 if (cp != erdata) {
385 RES_SET_H_ERRNO(statp, NO_RECOVERY);
386 return (-1);
387 }
388 break;
389 default:
390 dbg_printf("Impossible condition (type=%d)\n", type,
391 statp);
392 RES_SET_H_ERRNO(statp, NO_RECOVERY);
393 return (-1);
394 /* BIND has abort() here, too risky on bad data */
395 }
396 if (!had_error)
397 haveanswer++;
398 }
399 if (haveanswer) {
400 *ap = NULL;
401 *hap = NULL;
402 # if defined(RESOLVSORT)
403 /*
404 * Note: we sort even if host can take only one address
405 * in its return structures - should give it the "best"
406 * address in that case, not some random one
407 */
408 if (statp->nsort && haveanswer > 1 && qtype == T_A)
409 addrsort(hed->h_addr_ptrs, haveanswer, statp);
410 # endif /*RESOLVSORT*/
411 if (!he->h_name) {
412 n = strlen(qname) + 1; /* for the \0 */
413 if (n > ep - bp || n >= MAXHOSTNAMELEN)
414 goto no_recovery;
415 strcpy(bp, qname);
416 he->h_name = bp;
417 bp += n;
418 }
419 if (statp->options & RES_USE_INET6)
420 _map_v4v6_hostent(he, &bp, ep);
421 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
422 return (0);
423 }
424 no_recovery:
425 RES_SET_H_ERRNO(statp, NO_RECOVERY);
426 return (-1);
427 }
428
429 /* XXX: for async DNS resolver in ypserv */
430 struct hostent *
__dns_getanswer(const char * answer,int anslen,const char * qname,int qtype)431 __dns_getanswer(const char *answer, int anslen, const char *qname, int qtype)
432 {
433 struct hostent *he;
434 struct hostent_data *hed;
435 int error;
436 res_state statp;
437
438 statp = __res_state();
439 if ((he = __hostent_init()) == NULL ||
440 (hed = __hostent_data_init()) == NULL) {
441 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
442 return (NULL);
443 }
444 switch (qtype) {
445 case T_AAAA:
446 he->h_addrtype = AF_INET6;
447 he->h_length = NS_IN6ADDRSZ;
448 break;
449 case T_A:
450 default:
451 he->h_addrtype = AF_INET;
452 he->h_length = NS_INADDRSZ;
453 break;
454 }
455
456 error = gethostanswer((const querybuf *)answer, anslen, qname, qtype,
457 he, hed, statp);
458 return (error == 0) ? he : NULL;
459 }
460
461 int
_dns_gethostbyname(void * rval,void * cb_data,va_list ap)462 _dns_gethostbyname(void *rval, void *cb_data, va_list ap)
463 {
464 const char *name;
465 int af;
466 char *buffer;
467 size_t buflen;
468 int *errnop, *h_errnop;
469 struct hostent *hptr, he;
470 struct hostent_data *hed;
471 querybuf *buf;
472 int n, type, error;
473 res_state statp;
474
475 name = va_arg(ap, const char *);
476 af = va_arg(ap, int);
477 hptr = va_arg(ap, struct hostent *);
478 buffer = va_arg(ap, char *);
479 buflen = va_arg(ap, size_t);
480 errnop = va_arg(ap, int *);
481 h_errnop = va_arg(ap, int *);
482
483 *((struct hostent **)rval) = NULL;
484
485 statp = __res_state();
486 if ((hed = __hostent_data_init()) == NULL) {
487 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
488 *h_errnop = statp->res_h_errno;
489 return (NS_NOTFOUND);
490 }
491
492 he.h_addrtype = af;
493 switch (af) {
494 case AF_INET:
495 he.h_length = NS_INADDRSZ;
496 type = T_A;
497 break;
498 case AF_INET6:
499 he.h_length = NS_IN6ADDRSZ;
500 type = T_AAAA;
501 break;
502 default:
503 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
504 *h_errnop = statp->res_h_errno;
505 errno = EAFNOSUPPORT;
506 return (NS_UNAVAIL);
507 }
508
509 if ((buf = malloc(sizeof(*buf))) == NULL) {
510 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
511 *h_errnop = statp->res_h_errno;
512 return (NS_NOTFOUND);
513 }
514 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf));
515 if (n < 0) {
516 free(buf);
517 dbg_printf("res_nsearch failed (%d)\n", n, statp);
518 *h_errnop = statp->res_h_errno;
519 return (NS_NOTFOUND);
520 } else if (n > sizeof(buf->buf)) {
521 free(buf);
522 dbg_printf("static buffer is too small (%d)\n", n, statp);
523 *h_errnop = statp->res_h_errno;
524 return (NS_UNAVAIL);
525 }
526 error = gethostanswer(buf, n, name, type, &he, hed, statp);
527 free(buf);
528 if (error != 0) {
529 *h_errnop = statp->res_h_errno;
530 switch (statp->res_h_errno) {
531 case HOST_NOT_FOUND:
532 return (NS_NOTFOUND);
533 case TRY_AGAIN:
534 return (NS_TRYAGAIN);
535 default:
536 return (NS_UNAVAIL);
537 }
538 /*NOTREACHED*/
539 }
540 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
541 *errnop = errno;
542 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
543 *h_errnop = statp->res_h_errno;
544 return (NS_RETURN);
545 }
546 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
547 *((struct hostent **)rval) = hptr;
548 return (NS_SUCCESS);
549 }
550
551 int
_dns_gethostbyaddr(void * rval,void * cb_data,va_list ap)552 _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap)
553 {
554 const void *addr;
555 socklen_t len;
556 int af;
557 char *buffer;
558 size_t buflen;
559 int *errnop, *h_errnop;
560 const u_char *uaddr;
561 struct hostent *hptr, he;
562 struct hostent_data *hed;
563 int n;
564 querybuf *buf;
565 char qbuf[MAXDNAME+1], *qp;
566 res_state statp;
567 #ifdef SUNSECURITY
568 struct hostdata rhd;
569 struct hostent *rhe;
570 char **haddr;
571 u_long old_options;
572 char hname2[MAXDNAME+1], numaddr[46];
573 int ret_h_error;
574 #endif /*SUNSECURITY*/
575
576 addr = va_arg(ap, const void *);
577 len = va_arg(ap, socklen_t);
578 af = va_arg(ap, int);
579 hptr = va_arg(ap, struct hostent *);
580 buffer = va_arg(ap, char *);
581 buflen = va_arg(ap, size_t);
582 errnop = va_arg(ap, int *);
583 h_errnop = va_arg(ap, int *);
584 uaddr = (const u_char *)addr;
585
586 *((struct hostent **)rval) = NULL;
587
588 statp = __res_state();
589 if ((hed = __hostent_data_init()) == NULL) {
590 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
591 *h_errnop = statp->res_h_errno;
592 return (NS_NOTFOUND);
593 }
594
595 switch (af) {
596 case AF_INET:
597 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
598 (uaddr[3] & 0xff),
599 (uaddr[2] & 0xff),
600 (uaddr[1] & 0xff),
601 (uaddr[0] & 0xff));
602 break;
603 case AF_INET6:
604 qp = qbuf;
605 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) {
606 qp += SPRINTF((qp, "%x.%x.",
607 uaddr[n] & 0xf,
608 (uaddr[n] >> 4) & 0xf));
609 }
610 strlcat(qbuf, "ip6.arpa", sizeof(qbuf));
611 break;
612 default:
613 abort();
614 }
615 if ((buf = malloc(sizeof(*buf))) == NULL) {
616 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
617 *h_errnop = statp->res_h_errno;
618 return NS_NOTFOUND;
619 }
620 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf,
621 sizeof buf->buf);
622 if (n < 0) {
623 free(buf);
624 dbg_printf("res_nquery failed (%d)\n", n, statp);
625 *h_errnop = statp->res_h_errno;
626 return (NS_UNAVAIL);
627 }
628 if (n > sizeof buf->buf) {
629 free(buf);
630 dbg_printf("static buffer is too small (%d)\n", n, statp);
631 *h_errnop = statp->res_h_errno;
632 return (NS_UNAVAIL);
633 }
634 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) {
635 free(buf);
636 *h_errnop = statp->res_h_errno;
637 switch (statp->res_h_errno) {
638 case HOST_NOT_FOUND:
639 return (NS_NOTFOUND);
640 case TRY_AGAIN:
641 return (NS_TRYAGAIN);
642 default:
643 return (NS_UNAVAIL);
644 }
645 /*NOTREACHED*/
646 }
647 free(buf);
648 #ifdef SUNSECURITY
649 if (af == AF_INET) {
650 /*
651 * turn off search as the name should be absolute,
652 * 'localhost' should be matched by defnames
653 */
654 strncpy(hname2, he.h_name, MAXDNAME);
655 hname2[MAXDNAME] = '\0';
656 old_options = statp->options;
657 statp->options &= ~RES_DNSRCH;
658 statp->options |= RES_DEFNAMES;
659 memset(&rhd, 0, sizeof rhd);
660 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data,
661 sizeof(rhd.data), &ret_h_error);
662 if (rhe == NULL) {
663 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
664 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
665 syslog(LOG_NOTICE|LOG_AUTH,
666 "gethostbyaddr: No A record for %s (verifying [%s])",
667 hname2, numaddr);
668 statp->options = old_options;
669 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
670 *h_errnop = statp->res_h_errno;
671 return (NS_NOTFOUND);
672 }
673 statp->options = old_options;
674 for (haddr = rhe->h_addr_list; *haddr; haddr++)
675 if (!memcmp(*haddr, addr, NS_INADDRSZ))
676 break;
677 if (!*haddr) {
678 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
679 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
680 syslog(LOG_NOTICE|LOG_AUTH,
681 "gethostbyaddr: A record of %s != PTR record [%s]",
682 hname2, numaddr);
683 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
684 *h_errnop = statp->res_h_errno;
685 return (NS_NOTFOUND);
686 }
687 }
688 #endif /*SUNSECURITY*/
689 he.h_addrtype = af;
690 he.h_length = len;
691 memcpy(hed->host_addr, uaddr, len);
692 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
693 hed->h_addr_ptrs[1] = NULL;
694 if (af == AF_INET && (statp->options & RES_USE_INET6)) {
695 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr);
696 he.h_addrtype = AF_INET6;
697 he.h_length = NS_IN6ADDRSZ;
698 }
699 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
700 *errnop = errno;
701 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
702 *h_errnop = statp->res_h_errno;
703 return (NS_RETURN);
704 }
705 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
706 *((struct hostent **)rval) = hptr;
707 return (NS_SUCCESS);
708 }
709
710 #ifdef RESOLVSORT
711 static void
addrsort(char ** ap,int num,res_state res)712 addrsort(char **ap, int num, res_state res)
713 {
714 int i, j;
715 char **p;
716 short aval[_MAXADDRS];
717 int needsort = 0;
718
719 p = ap;
720 for (i = 0; i < num; i++, p++) {
721 for (j = 0 ; (unsigned)j < res->nsort; j++)
722 if (res->sort_list[j].addr.s_addr ==
723 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask))
724 break;
725 aval[i] = j;
726 if (needsort == 0 && i > 0 && j < aval[i-1])
727 needsort = i;
728 }
729 if (!needsort)
730 return;
731
732 while (needsort < num) {
733 for (j = needsort - 1; j >= 0; j--) {
734 if (aval[j] > aval[j+1]) {
735 char *hp;
736
737 i = aval[j];
738 aval[j] = aval[j+1];
739 aval[j+1] = i;
740
741 hp = ap[j];
742 ap[j] = ap[j+1];
743 ap[j+1] = hp;
744
745 } else
746 break;
747 }
748 needsort++;
749 }
750 }
751 #endif
752
753 void
_sethostdnsent(int stayopen)754 _sethostdnsent(int stayopen)
755 {
756 res_state statp;
757
758 statp = __res_state();
759 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1)
760 return;
761 if (stayopen)
762 statp->options |= RES_STAYOPEN | RES_USEVC;
763 }
764
765 void
_endhostdnsent(void)766 _endhostdnsent(void)
767 {
768 res_state statp;
769
770 statp = __res_state();
771 statp->options &= ~(RES_STAYOPEN | RES_USEVC);
772 res_nclose(statp);
773 }
774