Remove various ABS macros and replace uses with fabs (or in one case abs)
[glibc.git] / resolv / gethnamaddr.c
blob7fd0e497b137538e4cf91e9bbd82c795115165d9
1 /*
2 * ++Copyright++ 1985, 1988, 1993
3 * -
4 * Copyright (c) 1985, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
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 * 4. 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.
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.
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.
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--
52 /* XXX This file is not used by any of the resolver functions implemented by
53 glibc (i.e. get*info and gethostby*). It cannot be removed however because
54 it exports symbols in the libresolv ABI. The file is not maintained any
55 more, nor are these functions. */
57 #if defined(LIBC_SCCS) && !defined(lint)
58 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
59 #endif /* LIBC_SCCS and not lint */
61 #include <sys/types.h>
62 #include <sys/param.h>
63 #include <sys/socket.h>
64 #include <netinet/in.h>
65 #include <arpa/inet.h>
66 #include <arpa/nameser.h>
68 #include <stdio.h>
69 #include <netdb.h>
70 #include <resolv.h>
71 #include <ctype.h>
72 #include <errno.h>
73 #include <syslog.h>
75 #define RESOLVSORT
77 #ifndef LOG_AUTH
78 # define LOG_AUTH 0
79 #endif
81 #define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */
83 #if defined(BSD) && (BSD >= 199103) && defined(AF_INET6)
84 # include <stdlib.h>
85 # include <string.h>
86 #else
87 # include "../conf/portability.h"
88 #endif
90 #if defined(USE_OPTIONS_H)
91 # include <../conf/options.h>
92 #endif
94 #ifdef SPRINTF_CHAR
95 # define SPRINTF(x) strlen(sprintf/**/x)
96 #else
97 # define SPRINTF(x) ((size_t)sprintf x)
98 #endif
100 #define MAXALIASES 35
101 #define MAXADDRS 35
103 static const char AskedForGot[] =
104 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
106 static char *h_addr_ptrs[MAXADDRS + 1];
108 static struct hostent host;
109 static char *host_aliases[MAXALIASES];
110 static char hostbuf[8*1024];
111 static u_char host_addr[16]; /* IPv4 or IPv6 */
112 static FILE *hostf = NULL;
113 static int stayopen = 0;
115 static void map_v4v6_address (const char *src, char *dst) __THROW;
116 static void map_v4v6_hostent (struct hostent *hp, char **bp, int *len) __THROW;
118 #ifdef RESOLVSORT
119 extern void addrsort (char **, int) __THROW;
120 #endif
122 #if PACKETSZ > 65536
123 #define MAXPACKET PACKETSZ
124 #else
125 #define MAXPACKET 65536
126 #endif
128 /* As per RFC 1034 and 1035 a host name cannot exceed 255 octets in length. */
129 #ifdef MAXHOSTNAMELEN
130 # undef MAXHOSTNAMELEN
131 #endif
132 #define MAXHOSTNAMELEN 256
134 typedef union {
135 HEADER hdr;
136 u_char buf[MAXPACKET];
137 } querybuf;
139 typedef union {
140 int32_t al;
141 char ac;
142 } align;
144 #ifndef h_errno
145 extern int h_errno;
146 #endif
148 #ifdef DEBUG
149 static void
150 Dprintf(msg, num)
151 char *msg;
152 int num;
154 if (_res.options & RES_DEBUG) {
155 int save = errno;
157 printf(msg, num);
158 __set_errno (save);
161 #else
162 # define Dprintf(msg, num) /*nada*/
163 #endif
165 #define BOUNDED_INCR(x) \
166 do { \
167 cp += x; \
168 if (cp > eom) { \
169 __set_h_errno (NO_RECOVERY); \
170 return (NULL); \
172 } while (0)
174 #define BOUNDS_CHECK(ptr, count) \
175 do { \
176 if ((ptr) + (count) > eom) { \
177 __set_h_errno (NO_RECOVERY); \
178 return (NULL); \
180 } while (0)
183 static struct hostent *
184 getanswer (const querybuf *answer, int anslen, const char *qname, int qtype)
186 const HEADER *hp;
187 const u_char *cp;
188 int n;
189 const u_char *eom, *erdata;
190 char *bp, **ap, **hap;
191 int type, class, buflen, ancount, qdcount;
192 int haveanswer, had_error;
193 int toobig = 0;
194 char tbuf[MAXDNAME];
195 const char *tname;
196 int (*name_ok) (const char *);
198 tname = qname;
199 host.h_name = NULL;
200 eom = answer->buf + anslen;
201 switch (qtype) {
202 case T_A:
203 case T_AAAA:
204 name_ok = res_hnok;
205 break;
206 case T_PTR:
207 name_ok = res_dnok;
208 break;
209 default:
210 return (NULL); /* XXX should be abort(); */
213 * find first satisfactory answer
215 hp = &answer->hdr;
216 ancount = ntohs(hp->ancount);
217 qdcount = ntohs(hp->qdcount);
218 bp = hostbuf;
219 buflen = sizeof hostbuf;
220 cp = answer->buf;
221 BOUNDED_INCR(HFIXEDSZ);
222 if (qdcount != 1) {
223 __set_h_errno (NO_RECOVERY);
224 return (NULL);
226 n = dn_expand(answer->buf, eom, cp, bp, buflen);
227 if ((n < 0) || !(*name_ok)(bp)) {
228 __set_h_errno (NO_RECOVERY);
229 return (NULL);
231 BOUNDED_INCR(n + QFIXEDSZ);
232 if (qtype == T_A || qtype == T_AAAA) {
233 /* res_send() has already verified that the query name is the
234 * same as the one we sent; this just gets the expanded name
235 * (i.e., with the succeeding search-domain tacked on).
237 n = strlen(bp) + 1; /* for the \0 */
238 if (n >= MAXHOSTNAMELEN) {
239 __set_h_errno (NO_RECOVERY);
240 return (NULL);
242 host.h_name = bp;
243 bp += n;
244 buflen -= n;
245 /* The qname can be abbreviated, but h_name is now absolute. */
246 qname = host.h_name;
248 ap = host_aliases;
249 *ap = NULL;
250 host.h_aliases = host_aliases;
251 hap = h_addr_ptrs;
252 *hap = NULL;
253 host.h_addr_list = h_addr_ptrs;
254 haveanswer = 0;
255 had_error = 0;
256 while (ancount-- > 0 && cp < eom && !had_error) {
257 n = dn_expand(answer->buf, eom, cp, bp, buflen);
258 if ((n < 0) || !(*name_ok)(bp)) {
259 had_error++;
260 continue;
262 cp += n; /* name */
263 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
264 type = ns_get16(cp);
265 cp += INT16SZ; /* type */
266 class = ns_get16(cp);
267 cp += INT16SZ + INT32SZ; /* class, TTL */
268 n = ns_get16(cp);
269 cp += INT16SZ; /* len */
270 BOUNDS_CHECK(cp, n);
271 erdata = cp + n;
272 if (class != C_IN) {
273 /* XXX - debug? syslog? */
274 cp += n;
275 continue; /* XXX - had_error++ ? */
277 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
278 if (ap >= &host_aliases[MAXALIASES-1])
279 continue;
280 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
281 if ((n < 0) || !(*name_ok)(tbuf)) {
282 had_error++;
283 continue;
285 cp += n;
286 if (cp != erdata) {
287 __set_h_errno (NO_RECOVERY);
288 return (NULL);
290 /* Store alias. */
291 *ap++ = bp;
292 n = strlen(bp) + 1; /* for the \0 */
293 if (n >= MAXHOSTNAMELEN) {
294 had_error++;
295 continue;
297 bp += n;
298 buflen -= n;
299 /* Get canonical name. */
300 n = strlen(tbuf) + 1; /* for the \0 */
301 if (n > buflen || n >= MAXHOSTNAMELEN) {
302 had_error++;
303 continue;
305 strcpy(bp, tbuf);
306 host.h_name = bp;
307 bp += n;
308 buflen -= n;
309 continue;
311 if (qtype == T_PTR && type == T_CNAME) {
312 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
313 if (n < 0 || !res_dnok(tbuf)) {
314 had_error++;
315 continue;
317 cp += n;
318 if (cp != erdata) {
319 __set_h_errno (NO_RECOVERY);
320 return (NULL);
322 /* Get canonical name. */
323 n = strlen(tbuf) + 1; /* for the \0 */
324 if (n > buflen || n >= MAXHOSTNAMELEN) {
325 had_error++;
326 continue;
328 strcpy(bp, tbuf);
329 tname = bp;
330 bp += n;
331 buflen -= n;
332 continue;
334 if (type != qtype) {
335 /* Log a low priority message if we get an unexpected
336 * record, but skip it if we are using DNSSEC since it
337 * uses many different types in responses that do not
338 * match QTYPE.
340 if ((_res.options & RES_USE_DNSSEC) == 0) {
341 syslog(LOG_NOTICE|LOG_AUTH,
342 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
343 qname, p_class(C_IN), p_type(qtype),
344 p_type(type));
346 cp += n;
347 continue; /* XXX - had_error++ ? */
349 switch (type) {
350 case T_PTR:
351 if (strcasecmp(tname, bp) != 0) {
352 syslog(LOG_NOTICE|LOG_AUTH,
353 AskedForGot, qname, bp);
354 cp += n;
355 continue; /* XXX - had_error++ ? */
357 n = dn_expand(answer->buf, eom, cp, bp, buflen);
358 if ((n < 0) || !res_hnok(bp)) {
359 had_error++;
360 break;
362 #if MULTI_PTRS_ARE_ALIASES
363 cp += n;
364 if (cp != erdata) {
365 __set_h_errno (NO_RECOVERY);
366 return (NULL);
368 if (!haveanswer)
369 host.h_name = bp;
370 else if (ap < &host_aliases[MAXALIASES-1])
371 *ap++ = bp;
372 else
373 n = -1;
374 if (n != -1) {
375 n = strlen(bp) + 1; /* for the \0 */
376 if (n >= MAXHOSTNAMELEN) {
377 had_error++;
378 break;
380 bp += n;
381 buflen -= n;
383 break;
384 #else
385 host.h_name = bp;
386 if (_res.options & RES_USE_INET6) {
387 n = strlen(bp) + 1; /* for the \0 */
388 if (n >= MAXHOSTNAMELEN) {
389 had_error++;
390 break;
392 bp += n;
393 buflen -= n;
394 map_v4v6_hostent(&host, &bp, &buflen);
396 __set_h_errno (NETDB_SUCCESS);
397 return (&host);
398 #endif
399 case T_A:
400 case T_AAAA:
401 if (strcasecmp(host.h_name, bp) != 0) {
402 syslog(LOG_NOTICE|LOG_AUTH,
403 AskedForGot, host.h_name, bp);
404 cp += n;
405 continue; /* XXX - had_error++ ? */
407 if (n != host.h_length) {
408 cp += n;
409 continue;
411 if (!haveanswer) {
412 int nn;
414 host.h_name = bp;
415 nn = strlen(bp) + 1; /* for the \0 */
416 bp += nn;
417 buflen -= nn;
420 /* XXX: when incrementing bp, we have to decrement
421 * buflen by the same amount --okir */
422 buflen -= sizeof(align) - ((u_long)bp % sizeof(align));
424 bp += sizeof(align) - ((u_long)bp % sizeof(align));
426 if (bp + n >= &hostbuf[sizeof hostbuf]) {
427 Dprintf("size (%d) too big\n", n);
428 had_error++;
429 continue;
431 if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
432 if (!toobig++) {
433 Dprintf("Too many addresses (%d)\n",
434 MAXADDRS);
436 cp += n;
437 continue;
439 memmove(*hap++ = bp, cp, n);
440 bp += n;
441 buflen -= n;
442 cp += n;
443 if (cp != erdata) {
444 __set_h_errno (NO_RECOVERY);
445 return (NULL);
447 break;
448 default:
449 abort();
451 if (!had_error)
452 haveanswer++;
454 if (haveanswer) {
455 *ap = NULL;
456 *hap = NULL;
457 # if defined(RESOLVSORT)
459 * Note: we sort even if host can take only one address
460 * in its return structures - should give it the "best"
461 * address in that case, not some random one
463 if (_res.nsort && haveanswer > 1 && qtype == T_A)
464 addrsort(h_addr_ptrs, haveanswer);
465 # endif /*RESOLVSORT*/
466 if (!host.h_name) {
467 n = strlen(qname) + 1; /* for the \0 */
468 if (n > buflen || n >= MAXHOSTNAMELEN)
469 goto no_recovery;
470 strcpy(bp, qname);
471 host.h_name = bp;
472 bp += n;
473 buflen -= n;
475 if (_res.options & RES_USE_INET6)
476 map_v4v6_hostent(&host, &bp, &buflen);
477 __set_h_errno (NETDB_SUCCESS);
478 return (&host);
480 no_recovery:
481 __set_h_errno (NO_RECOVERY);
482 return (NULL);
485 extern struct hostent *gethostbyname2(const char *name, int af);
486 libresolv_hidden_proto (gethostbyname2)
488 struct hostent *
489 gethostbyname(name)
490 const char *name;
492 struct hostent *hp;
494 if (__res_maybe_init (&_res, 0) == -1) {
495 __set_h_errno (NETDB_INTERNAL);
496 return (NULL);
498 if (_res.options & RES_USE_INET6) {
499 hp = gethostbyname2(name, AF_INET6);
500 if (hp)
501 return (hp);
503 return (gethostbyname2(name, AF_INET));
506 struct hostent *
507 gethostbyname2(name, af)
508 const char *name;
509 int af;
511 union
513 querybuf *buf;
514 u_char *ptr;
515 } buf;
516 querybuf *origbuf;
517 const char *cp;
518 char *bp;
519 int n, size, type, len;
520 struct hostent *ret;
522 if (__res_maybe_init (&_res, 0) == -1) {
523 __set_h_errno (NETDB_INTERNAL);
524 return (NULL);
527 switch (af) {
528 case AF_INET:
529 size = INADDRSZ;
530 type = T_A;
531 break;
532 case AF_INET6:
533 size = IN6ADDRSZ;
534 type = T_AAAA;
535 break;
536 default:
537 __set_h_errno (NETDB_INTERNAL);
538 __set_errno (EAFNOSUPPORT);
539 return (NULL);
542 host.h_addrtype = af;
543 host.h_length = size;
546 * if there aren't any dots, it could be a user-level alias.
547 * this is also done in res_query() since we are not the only
548 * function that looks up host names.
550 if (!strchr(name, '.') && (cp = __hostalias(name)))
551 name = cp;
554 * disallow names consisting only of digits/dots, unless
555 * they end in a dot.
557 if (isdigit(name[0]))
558 for (cp = name;; ++cp) {
559 if (!*cp) {
560 if (*--cp == '.')
561 break;
563 * All-numeric, no dot at the end.
564 * Fake up a hostent as if we'd actually
565 * done a lookup.
567 if (inet_pton(af, name, host_addr) <= 0) {
568 __set_h_errno (HOST_NOT_FOUND);
569 return (NULL);
571 strncpy(hostbuf, name, MAXDNAME);
572 hostbuf[MAXDNAME] = '\0';
573 bp = hostbuf + MAXDNAME;
574 len = sizeof hostbuf - MAXDNAME;
575 host.h_name = hostbuf;
576 host.h_aliases = host_aliases;
577 host_aliases[0] = NULL;
578 h_addr_ptrs[0] = (char *)host_addr;
579 h_addr_ptrs[1] = NULL;
580 host.h_addr_list = h_addr_ptrs;
581 if (_res.options & RES_USE_INET6)
582 map_v4v6_hostent(&host, &bp, &len);
583 __set_h_errno (NETDB_SUCCESS);
584 return (&host);
586 if (!isdigit(*cp) && *cp != '.')
587 break;
589 if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||
590 name[0] == ':')
591 for (cp = name;; ++cp) {
592 if (!*cp) {
593 if (*--cp == '.')
594 break;
596 * All-IPv6-legal, no dot at the end.
597 * Fake up a hostent as if we'd actually
598 * done a lookup.
600 if (inet_pton(af, name, host_addr) <= 0) {
601 __set_h_errno (HOST_NOT_FOUND);
602 return (NULL);
604 strncpy(hostbuf, name, MAXDNAME);
605 hostbuf[MAXDNAME] = '\0';
606 bp = hostbuf + MAXDNAME;
607 len = sizeof hostbuf - MAXDNAME;
608 host.h_name = hostbuf;
609 host.h_aliases = host_aliases;
610 host_aliases[0] = NULL;
611 h_addr_ptrs[0] = (char *)host_addr;
612 h_addr_ptrs[1] = NULL;
613 host.h_addr_list = h_addr_ptrs;
614 __set_h_errno (NETDB_SUCCESS);
615 return (&host);
617 if (!isxdigit(*cp) && *cp != ':' && *cp != '.')
618 break;
621 buf.buf = origbuf = (querybuf *) alloca (1024);
623 if ((n = __libc_res_nsearch(&_res, name, C_IN, type, buf.buf->buf, 1024,
624 &buf.ptr, NULL, NULL, NULL, NULL)) < 0) {
625 if (buf.buf != origbuf)
626 free (buf.buf);
627 Dprintf("res_nsearch failed (%d)\n", n);
628 if (errno == ECONNREFUSED)
629 return (_gethtbyname2(name, af));
630 return (NULL);
632 ret = getanswer(buf.buf, n, name, type);
633 if (buf.buf != origbuf)
634 free (buf.buf);
635 return ret;
637 libresolv_hidden_def (gethostbyname2)
639 struct hostent *
640 gethostbyaddr(addr, len, af)
641 const void *addr;
642 socklen_t len;
643 int af;
645 const u_char *uaddr = (const u_char *)addr;
646 static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
647 static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
648 int n;
649 socklen_t size;
650 union
652 querybuf *buf;
653 u_char *ptr;
654 } buf;
655 querybuf *orig_buf;
656 struct hostent *hp;
657 char qbuf[MAXDNAME+1], *qp = NULL;
658 #ifdef SUNSECURITY
659 struct hostent *rhp;
660 char **haddr;
661 u_long old_options;
662 char hname2[MAXDNAME+1];
663 #endif /*SUNSECURITY*/
665 if (__res_maybe_init (&_res, 0) == -1) {
666 __set_h_errno (NETDB_INTERNAL);
667 return (NULL);
669 if (af == AF_INET6 && len == IN6ADDRSZ &&
670 (!memcmp(uaddr, mapped, sizeof mapped) ||
671 !memcmp(uaddr, tunnelled, sizeof tunnelled))) {
672 /* Unmap. */
673 addr += sizeof mapped;
674 uaddr += sizeof mapped;
675 af = AF_INET;
676 len = INADDRSZ;
678 switch (af) {
679 case AF_INET:
680 size = INADDRSZ;
681 break;
682 case AF_INET6:
683 size = IN6ADDRSZ;
684 break;
685 default:
686 __set_errno (EAFNOSUPPORT);
687 __set_h_errno (NETDB_INTERNAL);
688 return (NULL);
690 if (size != len) {
691 __set_errno (EINVAL);
692 __set_h_errno (NETDB_INTERNAL);
693 return (NULL);
695 switch (af) {
696 case AF_INET:
697 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
698 (uaddr[3] & 0xff),
699 (uaddr[2] & 0xff),
700 (uaddr[1] & 0xff),
701 (uaddr[0] & 0xff));
702 break;
703 case AF_INET6:
704 qp = qbuf;
705 for (n = IN6ADDRSZ - 1; n >= 0; n--) {
706 qp += SPRINTF((qp, "%x.%x.",
707 uaddr[n] & 0xf,
708 (uaddr[n] >> 4) & 0xf));
710 strcpy(qp, "ip6.arpa");
711 break;
712 default:
713 abort();
716 buf.buf = orig_buf = (querybuf *) alloca (1024);
718 n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf, 1024,
719 &buf.ptr, NULL, NULL, NULL, NULL);
720 if (n < 0 && af == AF_INET6 && (_res.options & RES_NOIP6DOTINT) == 0) {
721 strcpy(qp, "ip6.int");
722 n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf,
723 buf.buf != orig_buf ? MAXPACKET : 1024,
724 &buf.ptr, NULL, NULL, NULL, NULL);
726 if (n < 0) {
727 if (buf.buf != orig_buf)
728 free (buf.buf);
729 Dprintf("res_nquery failed (%d)\n", n);
730 if (errno == ECONNREFUSED)
731 return (_gethtbyaddr(addr, len, af));
732 return (NULL);
734 hp = getanswer(buf.buf, n, qbuf, T_PTR);
735 if (buf.buf != orig_buf)
736 free (buf.buf);
737 if (!hp)
738 return (NULL); /* h_errno was set by getanswer() */
739 #ifdef SUNSECURITY
740 if (af == AF_INET) {
742 * turn off search as the name should be absolute,
743 * 'localhost' should be matched by defnames
745 strncpy(hname2, hp->h_name, MAXDNAME);
746 hname2[MAXDNAME] = '\0';
747 old_options = _res.options;
748 _res.options &= ~RES_DNSRCH;
749 _res.options |= RES_DEFNAMES;
750 if (!(rhp = gethostbyname(hname2))) {
751 syslog(LOG_NOTICE|LOG_AUTH,
752 "gethostbyaddr: No A record for %s (verifying [%s])",
753 hname2, inet_ntoa(*((struct in_addr *)addr)));
754 _res.options = old_options;
755 __set_h_errno (HOST_NOT_FOUND);
756 return (NULL);
758 _res.options = old_options;
759 for (haddr = rhp->h_addr_list; *haddr; haddr++)
760 if (!memcmp(*haddr, addr, INADDRSZ))
761 break;
762 if (!*haddr) {
763 syslog(LOG_NOTICE|LOG_AUTH,
764 "gethostbyaddr: A record of %s != PTR record [%s]",
765 hname2, inet_ntoa(*((struct in_addr *)addr)));
766 __set_h_errno (HOST_NOT_FOUND);
767 return (NULL);
770 #endif /*SUNSECURITY*/
771 hp->h_addrtype = af;
772 hp->h_length = len;
773 memmove(host_addr, addr, len);
774 h_addr_ptrs[0] = (char *)host_addr;
775 h_addr_ptrs[1] = NULL;
776 if (af == AF_INET && (_res.options & RES_USE_INET6)) {
777 map_v4v6_address((char*)host_addr, (char*)host_addr);
778 hp->h_addrtype = AF_INET6;
779 hp->h_length = IN6ADDRSZ;
781 __set_h_errno (NETDB_SUCCESS);
782 return (hp);
785 void
786 _sethtent(f)
787 int f;
789 if (!hostf)
790 hostf = fopen(_PATH_HOSTS, "rce" );
791 else
792 rewind(hostf);
793 stayopen = f;
795 libresolv_hidden_def (_sethtent)
797 void
798 _endhtent (void)
800 if (hostf && !stayopen) {
801 (void) fclose(hostf);
802 hostf = NULL;
806 struct hostent *
807 _gethtent (void)
809 char *p;
810 char *cp, **q;
811 int af, len;
813 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "rce" ))) {
814 __set_h_errno (NETDB_INTERNAL);
815 return (NULL);
817 again:
818 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
819 __set_h_errno (HOST_NOT_FOUND);
820 return (NULL);
822 if (*p == '#')
823 goto again;
824 if (!(cp = strpbrk(p, "#\n")))
825 goto again;
826 *cp = '\0';
827 if (!(cp = strpbrk(p, " \t")))
828 goto again;
829 *cp++ = '\0';
830 if (inet_pton(AF_INET6, p, host_addr) > 0) {
831 af = AF_INET6;
832 len = IN6ADDRSZ;
833 } else if (inet_pton(AF_INET, p, host_addr) > 0) {
834 if (_res.options & RES_USE_INET6) {
835 map_v4v6_address((char*)host_addr, (char*)host_addr);
836 af = AF_INET6;
837 len = IN6ADDRSZ;
838 } else {
839 af = AF_INET;
840 len = INADDRSZ;
842 } else {
843 goto again;
845 h_addr_ptrs[0] = (char *)host_addr;
846 h_addr_ptrs[1] = NULL;
847 host.h_addr_list = h_addr_ptrs;
848 host.h_length = len;
849 host.h_addrtype = af;
850 while (*cp == ' ' || *cp == '\t')
851 cp++;
852 host.h_name = cp;
853 q = host.h_aliases = host_aliases;
854 if ((cp = strpbrk(cp, " \t")))
855 *cp++ = '\0';
856 while (cp && *cp) {
857 if (*cp == ' ' || *cp == '\t') {
858 cp++;
859 continue;
861 if (q < &host_aliases[MAXALIASES - 1])
862 *q++ = cp;
863 if ((cp = strpbrk(cp, " \t")))
864 *cp++ = '\0';
866 *q = NULL;
867 __set_h_errno (NETDB_SUCCESS);
868 return (&host);
870 libresolv_hidden_def (_gethtent)
872 struct hostent *
873 _gethtbyname(name)
874 const char *name;
876 struct hostent *hp;
878 if (_res.options & RES_USE_INET6) {
879 hp = _gethtbyname2(name, AF_INET6);
880 if (hp)
881 return (hp);
883 return (_gethtbyname2(name, AF_INET));
886 struct hostent *
887 _gethtbyname2(name, af)
888 const char *name;
889 int af;
891 struct hostent *p;
892 char **cp;
894 _sethtent(0);
895 while ((p = _gethtent())) {
896 if (p->h_addrtype != af)
897 continue;
898 if (strcasecmp(p->h_name, name) == 0)
899 break;
900 for (cp = p->h_aliases; *cp != 0; cp++)
901 if (strcasecmp(*cp, name) == 0)
902 goto found;
904 found:
905 _endhtent();
906 return (p);
908 libresolv_hidden_def (_gethtbyname2)
910 struct hostent *
911 _gethtbyaddr(addr, len, af)
912 const char *addr;
913 size_t len;
914 int af;
916 struct hostent *p;
918 _sethtent(0);
919 while ((p = _gethtent()))
920 if (p->h_addrtype == af && !memcmp(p->h_addr, addr, len))
921 break;
922 _endhtent();
923 return (p);
925 libresolv_hidden_def (_gethtbyaddr)
927 static void
928 map_v4v6_address(src, dst)
929 const char *src;
930 char *dst;
932 u_char *p = (u_char *)dst;
933 char tmp[INADDRSZ];
934 int i;
936 /* Stash a temporary copy so our caller can update in place. */
937 memcpy(tmp, src, INADDRSZ);
938 /* Mark this ipv6 addr as a mapped ipv4. */
939 for (i = 0; i < 10; i++)
940 *p++ = 0x00;
941 *p++ = 0xff;
942 *p++ = 0xff;
943 /* Retrieve the saved copy and we're done. */
944 memcpy((void*)p, tmp, INADDRSZ);
947 static void
948 map_v4v6_hostent(hp, bpp, lenp)
949 struct hostent *hp;
950 char **bpp;
951 int *lenp;
953 char **ap;
955 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
956 return;
957 hp->h_addrtype = AF_INET6;
958 hp->h_length = IN6ADDRSZ;
959 for (ap = hp->h_addr_list; *ap; ap++) {
960 int i = sizeof(align) - ((u_long)*bpp % sizeof(align));
962 if (*lenp < (i + IN6ADDRSZ)) {
963 /* Out of memory. Truncate address list here. XXX */
964 *ap = NULL;
965 return;
967 *bpp += i;
968 *lenp -= i;
969 map_v4v6_address(*ap, *bpp);
970 *ap = *bpp;
971 *bpp += IN6ADDRSZ;
972 *lenp -= IN6ADDRSZ;
976 #ifdef RESOLVSORT
977 extern void
978 addrsort(ap, num)
979 char **ap;
980 int num;
982 int i, j;
983 char **p;
984 short aval[MAXADDRS];
985 int needsort = 0;
987 p = ap;
988 for (i = 0; i < num; i++, p++) {
989 for (j = 0 ; (unsigned)j < _res.nsort; j++)
990 if (_res.sort_list[j].addr.s_addr ==
991 (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
992 break;
993 aval[i] = j;
994 if (needsort == 0 && i > 0 && j < aval[i-1])
995 needsort = i;
997 if (!needsort)
998 return;
1000 while (needsort < num) {
1001 for (j = needsort - 1; j >= 0; j--) {
1002 if (aval[j] > aval[j+1]) {
1003 char *hp;
1005 i = aval[j];
1006 aval[j] = aval[j+1];
1007 aval[j+1] = i;
1009 hp = ap[j];
1010 ap[j] = ap[j+1];
1011 ap[j+1] = hp;
1013 } else
1014 break;
1016 needsort++;
1019 #endif
1021 #if defined(BSD43_BSD43_NFS) || defined(sun)
1022 /* some libc's out there are bound internally to these names (UMIPS) */
1023 void
1024 ht_sethostent(stayopen)
1025 int stayopen;
1027 _sethtent(stayopen);
1030 void
1031 ht_endhostent (void)
1033 _endhtent();
1036 struct hostent *
1037 ht_gethostbyname(name)
1038 char *name;
1040 return (_gethtbyname(name));
1043 struct hostent *
1044 ht_gethostbyaddr(addr, len, af)
1045 const char *addr;
1046 size_t len;
1047 int af;
1049 return (_gethtbyaddr(addr, len, af));
1052 struct hostent *
1053 gethostent (void)
1055 return (_gethtent());
1058 void
1059 dns_service (void)
1061 return;
1064 #undef dn_skipname
1065 dn_skipname(comp_dn, eom)
1066 const u_char *comp_dn, *eom;
1068 return (__dn_skipname(comp_dn, eom));
1070 #endif /*old-style libc with yp junk in it*/