1 /*
2 * ++Copyright++ 1985, 1988, 1993
3 * -
4 * Copyright (c) 1985, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 * -
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47 * SOFTWARE.
48 * -
49 * --Copyright--
50 *
51 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93
52 * From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $
53 * $FreeBSD: src/lib/libc/net/gethostbydns.c,v 1.58 2007/01/09 00:28:02 imp Exp $
54 */
55
56 #include <sys/types.h>
57 #include <sys/param.h>
58 #include <sys/socket.h>
59 #include <netinet/in.h>
60 #include <arpa/inet.h>
61 #include <arpa/nameser.h>
62
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <unistd.h>
66 #include <string.h>
67 #include <netdb.h>
68 #include <resolv.h>
69 #include <ctype.h>
70 #include <errno.h>
71 #include <syslog.h>
72 #include <stdarg.h>
73 #include <nsswitch.h>
74
75 #include "netdb_private.h"
76 #include "res_config.h"
77
78 #define SPRINTF(x) ((size_t)sprintf x)
79
80 static const char AskedForGot[] =
81 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\"";
82
83 #ifdef RESOLVSORT
84 static void addrsort(char **, int, res_state);
85 #endif
86
87 #ifdef DEBUG
88 static void dbg_printf(char *, int, res_state) __printflike(1, 0);
89 #endif
90
91 #define MAXPACKET (64*1024)
92
93 typedef union {
94 HEADER hdr;
95 u_char buf[MAXPACKET];
96 } querybuf;
97
98 typedef union {
99 int32_t al;
100 char ac;
101 } align;
102
103 int _dns_ttl_;
104
105 #ifdef DEBUG
106 static void
dbg_printf(char * msg,int num,res_state res)107 dbg_printf(char *msg, int num, res_state res)
108 {
109 if (res->options & RES_DEBUG) {
110 int save = errno;
111
112 printf(msg, num);
113 errno = save;
114 }
115 }
116 #else
117 # define dbg_printf(msg, num, res) /*nada*/
118 #endif
119
120 #define BOUNDED_INCR(x) \
121 do { \
122 cp += x; \
123 if (cp > eom) { \
124 RES_SET_H_ERRNO(statp, NO_RECOVERY); \
125 return (-1); \
126 } \
127 } while (0)
128
129 #define BOUNDS_CHECK(ptr, count) \
130 do { \
131 if ((ptr) + (count) > eom) { \
132 RES_SET_H_ERRNO(statp, NO_RECOVERY); \
133 return (-1); \
134 } \
135 } while (0)
136
137 static int
gethostanswer(const querybuf * answer,int anslen,const char * qname,int qtype,struct hostent * he,struct hostent_data * hed,res_state statp)138 gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
139 struct hostent *he, struct hostent_data *hed, res_state statp)
140 {
141 const HEADER *hp;
142 const u_char *cp;
143 int n;
144 const u_char *eom, *erdata;
145 char *bp, *ep, **ap, **hap;
146 int type, class, ancount, qdcount;
147 int haveanswer, had_error;
148 int toobig = 0;
149 char tbuf[MAXDNAME];
150 const char *tname;
151 int (*name_ok)(const char *);
152
153 tname = qname;
154 he->h_name = NULL;
155 eom = answer->buf + anslen;
156 switch (qtype) {
157 case T_A:
158 case T_AAAA:
159 name_ok = res_hnok;
160 break;
161 case T_PTR:
162 name_ok = res_dnok;
163 break;
164 default:
165 RES_SET_H_ERRNO(statp, NO_RECOVERY);
166 return (-1); /* XXX should be abort(); */
167 }
168 /*
169 * find first satisfactory answer
170 */
171 hp = &answer->hdr;
172 ancount = ntohs(hp->ancount);
173 qdcount = ntohs(hp->qdcount);
174 bp = hed->hostbuf;
175 ep = hed->hostbuf + sizeof hed->hostbuf;
176 cp = answer->buf;
177 BOUNDED_INCR(HFIXEDSZ);
178 if (qdcount != 1) {
179 RES_SET_H_ERRNO(statp, NO_RECOVERY);
180 return (-1);
181 }
182 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
183 if ((n < 0) || !(*name_ok)(bp)) {
184 RES_SET_H_ERRNO(statp, NO_RECOVERY);
185 return (-1);
186 }
187 BOUNDED_INCR(n + QFIXEDSZ);
188 if (qtype == T_A || qtype == T_AAAA) {
189 /* res_send() has already verified that the query name is the
190 * same as the one we sent; this just gets the expanded name
191 * (i.e., with the succeeding search-domain tacked on).
192 */
193 n = strlen(bp) + 1; /* for the \0 */
194 if (n >= MAXHOSTNAMELEN) {
195 RES_SET_H_ERRNO(statp, NO_RECOVERY);
196 return (-1);
197 }
198 he->h_name = bp;
199 bp += n;
200 /* The qname can be abbreviated, but h_name is now absolute. */
201 qname = he->h_name;
202 }
203 ap = hed->host_aliases;
204 *ap = NULL;
205 he->h_aliases = hed->host_aliases;
206 hap = hed->h_addr_ptrs;
207 *hap = NULL;
208 he->h_addr_list = hed->h_addr_ptrs;
209 haveanswer = 0;
210 had_error = 0;
211 _dns_ttl_ = -1;
212 while (ancount-- > 0 && cp < eom && !had_error) {
213 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
214 if ((n < 0) || !(*name_ok)(bp)) {
215 had_error++;
216 continue;
217 }
218 cp += n; /* name */
219 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
220 type = _getshort(cp);
221 cp += INT16SZ; /* type */
222 class = _getshort(cp);
223 cp += INT16SZ; /* class */
224 if (qtype == T_A && type == T_A)
225 _dns_ttl_ = _getlong(cp);
226 cp += INT32SZ; /* TTL */
227 n = _getshort(cp);
228 cp += INT16SZ; /* len */
229 BOUNDS_CHECK(cp, n);
230 erdata = cp + n;
231 if (class != C_IN) {
232 /* XXX - debug? syslog? */
233 cp += n;
234 continue; /* XXX - had_error++ ? */
235 }
236 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
237 if (ap >= &hed->host_aliases[_MAXALIASES-1])
238 continue;
239 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
240 if ((n < 0) || !(*name_ok)(tbuf)) {
241 had_error++;
242 continue;
243 }
244 cp += n;
245 if (cp != erdata) {
246 RES_SET_H_ERRNO(statp, NO_RECOVERY);
247 return (-1);
248 }
249 /* Store alias. */
250 *ap++ = bp;
251 n = strlen(bp) + 1; /* for the \0 */
252 if (n >= MAXHOSTNAMELEN) {
253 had_error++;
254 continue;
255 }
256 bp += n;
257 /* Get canonical name. */
258 n = strlen(tbuf) + 1; /* for the \0 */
259 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
260 had_error++;
261 continue;
262 }
263 strcpy(bp, tbuf);
264 he->h_name = bp;
265 bp += n;
266 continue;
267 }
268 if (qtype == T_PTR && type == T_CNAME) {
269 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
270 if (n < 0 || !res_dnok(tbuf)) {
271 had_error++;
272 continue;
273 }
274 cp += n;
275 if (cp != erdata) {
276 RES_SET_H_ERRNO(statp, NO_RECOVERY);
277 return (-1);
278 }
279 /* Get canonical name. */
280 n = strlen(tbuf) + 1; /* for the \0 */
281 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
282 had_error++;
283 continue;
284 }
285 strcpy(bp, tbuf);
286 tname = bp;
287 bp += n;
288 continue;
289 }
290 if (type != qtype) {
291 if (type != T_SIG)
292 syslog(LOG_NOTICE|LOG_AUTH,
293 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"",
294 qname, p_class(C_IN), p_type(qtype),
295 p_type(type));
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 __unused,va_list ap)462 _dns_gethostbyname(void *rval, void *cb_data __unused, va_list ap)
463 {
464 const char *name;
465 int af;
466 char *buffer;
467 size_t buflen;
468 int *errnop __unused;
469 int *h_errnop;
470 struct hostent *hptr, he;
471 struct hostent_data *hed;
472 querybuf *buf;
473 int n, type, error;
474 res_state statp;
475
476 name = va_arg(ap, const char *);
477 af = va_arg(ap, int);
478 hptr = va_arg(ap, struct hostent *);
479 buffer = va_arg(ap, char *);
480 buflen = va_arg(ap, size_t);
481 errnop = va_arg(ap, int *);
482 h_errnop = va_arg(ap, int *);
483
484 *((struct hostent **)rval) = NULL;
485
486 statp = __res_state();
487 if ((hed = __hostent_data_init()) == NULL) {
488 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
489 *h_errnop = statp->res_h_errno;
490 return (NS_NOTFOUND);
491 }
492
493 he.h_addrtype = af;
494 switch (af) {
495 case AF_INET:
496 he.h_length = NS_INADDRSZ;
497 type = T_A;
498 break;
499 case AF_INET6:
500 he.h_length = NS_IN6ADDRSZ;
501 type = T_AAAA;
502 break;
503 default:
504 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
505 *h_errnop = statp->res_h_errno;
506 errno = EAFNOSUPPORT;
507 return (NS_UNAVAIL);
508 }
509
510 if ((buf = malloc(sizeof(*buf))) == NULL) {
511 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
512 *h_errnop = statp->res_h_errno;
513 return (NS_NOTFOUND);
514 }
515 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf));
516 if (n < 0) {
517 free(buf);
518 dbg_printf("res_nsearch failed (%d)\n", n, statp);
519 *h_errnop = statp->res_h_errno;
520 return (0);
521 } else if (n > sizeof(buf->buf)) {
522 free(buf);
523 dbg_printf("static buffer is too small (%d)\n", n, statp);
524 *h_errnop = statp->res_h_errno;
525 return (0);
526 }
527 error = gethostanswer(buf, n, name, type, &he, hed, statp);
528 free(buf);
529 if (error != 0) {
530 *h_errnop = statp->res_h_errno;
531 return (NS_NOTFOUND);
532 }
533 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
534 *h_errnop = statp->res_h_errno;
535 return (NS_NOTFOUND);
536 }
537 *((struct hostent **)rval) = hptr;
538 return (NS_SUCCESS);
539 }
540
541 int
_dns_gethostbyaddr(void * rval,void * cb_data __unused,va_list ap)542 _dns_gethostbyaddr(void *rval, void *cb_data __unused, va_list ap)
543 {
544 const void *addr;
545 socklen_t len;
546 int af;
547 char *buffer;
548 size_t buflen;
549 int *errnop __unused;
550 int *h_errnop;
551 const u_char *uaddr;
552 struct hostent *hptr, he;
553 struct hostent_data *hed;
554 int n;
555 querybuf *buf;
556 char qbuf[MAXDNAME+1], *qp;
557 res_state statp;
558 #ifdef SUNSECURITY
559 struct hostdata rhd;
560 struct hostent *rhe;
561 char **haddr;
562 u_long old_options;
563 char hname2[MAXDNAME+1], numaddr[46];
564 int ret_h_error;
565 #endif /*SUNSECURITY*/
566
567 addr = va_arg(ap, const void *);
568 len = va_arg(ap, socklen_t);
569 af = va_arg(ap, int);
570 hptr = va_arg(ap, struct hostent *);
571 buffer = va_arg(ap, char *);
572 buflen = va_arg(ap, size_t);
573 errnop = va_arg(ap, int *);
574 h_errnop = va_arg(ap, int *);
575 uaddr = (const u_char *)addr;
576
577 *((struct hostent **)rval) = NULL;
578
579 statp = __res_state();
580 if ((hed = __hostent_data_init()) == NULL) {
581 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
582 *h_errnop = statp->res_h_errno;
583 return (NS_NOTFOUND);
584 }
585
586 switch (af) {
587 case AF_INET:
588 sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
589 (uaddr[3] & 0xff),
590 (uaddr[2] & 0xff),
591 (uaddr[1] & 0xff),
592 (uaddr[0] & 0xff));
593 break;
594 case AF_INET6:
595 qp = qbuf;
596 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) {
597 qp += SPRINTF((qp, "%x.%x.",
598 uaddr[n] & 0xf,
599 (uaddr[n] >> 4) & 0xf));
600 }
601 strlcat(qbuf, "ip6.arpa", sizeof(qbuf));
602 break;
603 default:
604 abort();
605 }
606 if ((buf = malloc(sizeof(*buf))) == NULL) {
607 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
608 *h_errnop = statp->res_h_errno;
609 return NS_NOTFOUND;
610 }
611 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf,
612 sizeof buf->buf);
613 if (n < 0) {
614 free(buf);
615 dbg_printf("res_nquery failed (%d)\n", n, statp);
616 *h_errnop = statp->res_h_errno;
617 return (NS_UNAVAIL);
618 }
619 if (n > sizeof buf->buf) {
620 free(buf);
621 dbg_printf("static buffer is too small (%d)\n", n, statp);
622 *h_errnop = statp->res_h_errno;
623 return (NS_UNAVAIL);
624 }
625 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) {
626 free(buf);
627 *h_errnop = statp->res_h_errno;
628 return (NS_NOTFOUND); /* h_errno was set by gethostanswer() */
629 }
630 free(buf);
631 #ifdef SUNSECURITY
632 if (af == AF_INET) {
633 /*
634 * turn off search as the name should be absolute,
635 * 'localhost' should be matched by defnames
636 */
637 strncpy(hname2, he.h_name, MAXDNAME);
638 hname2[MAXDNAME] = '\0';
639 old_options = statp->options;
640 statp->options &= ~RES_DNSRCH;
641 statp->options |= RES_DEFNAMES;
642 memset(&rhd, 0, sizeof rhd);
643 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data,
644 sizeof(rhd.data), &ret_h_error);
645 if (rhe == NULL) {
646 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
647 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
648 syslog(LOG_NOTICE|LOG_AUTH,
649 "gethostbyaddr: No A record for %s (verifying [%s])",
650 hname2, numaddr);
651 statp->options = old_options;
652 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
653 *h_errnop = statp->res_h_errno;
654 return (NS_NOTFOUND);
655 }
656 statp->options = old_options;
657 for (haddr = rhe->h_addr_list; *haddr; haddr++)
658 if (!memcmp(*haddr, addr, NS_INADDRSZ))
659 break;
660 if (!*haddr) {
661 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
662 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr));
663 syslog(LOG_NOTICE|LOG_AUTH,
664 "gethostbyaddr: A record of %s != PTR record [%s]",
665 hname2, numaddr);
666 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
667 *h_errnop = statp->res_h_errno;
668 return (NS_NOTFOUND);
669 }
670 }
671 #endif /*SUNSECURITY*/
672 he.h_addrtype = af;
673 he.h_length = len;
674 memcpy(hed->host_addr, uaddr, len);
675 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
676 hed->h_addr_ptrs[1] = NULL;
677 if (af == AF_INET && (statp->options & RES_USE_INET6)) {
678 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr);
679 he.h_addrtype = AF_INET6;
680 he.h_length = NS_IN6ADDRSZ;
681 }
682 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
683 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
684 *h_errnop = statp->res_h_errno;
685 return (NS_NOTFOUND);
686 }
687 *((struct hostent **)rval) = hptr;
688 return (NS_SUCCESS);
689 }
690
691 #ifdef RESOLVSORT
692 static void
addrsort(char ** ap,int num,res_state res)693 addrsort(char **ap, int num, res_state res)
694 {
695 int i, j;
696 char **p;
697 short aval[_MAXADDRS];
698 int needsort = 0;
699
700 p = ap;
701 for (i = 0; i < num; i++, p++) {
702 for (j = 0 ; (unsigned)j < res->nsort; j++)
703 if (res->sort_list[j].addr.s_addr ==
704 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask))
705 break;
706 aval[i] = j;
707 if (needsort == 0 && i > 0 && j < aval[i-1])
708 needsort = i;
709 }
710 if (!needsort)
711 return;
712
713 while (needsort < num) {
714 for (j = needsort - 1; j >= 0; j--) {
715 if (aval[j] > aval[j+1]) {
716 char *hp;
717
718 i = aval[j];
719 aval[j] = aval[j+1];
720 aval[j+1] = i;
721
722 hp = ap[j];
723 ap[j] = ap[j+1];
724 ap[j+1] = hp;
725
726 } else
727 break;
728 }
729 needsort++;
730 }
731 }
732 #endif
733
734 void
_sethostdnsent(int stayopen)735 _sethostdnsent(int stayopen)
736 {
737 res_state statp;
738
739 statp = __res_state();
740 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1)
741 return;
742 if (stayopen)
743 statp->options |= RES_STAYOPEN | RES_USEVC;
744 }
745
746 void
_endhostdnsent(void)747 _endhostdnsent(void)
748 {
749 res_state statp;
750
751 statp = __res_state();
752 statp->options &= ~(RES_STAYOPEN | RES_USEVC);
753 res_nclose(statp);
754 }
755