1 /*-
2 * Copyright (c) 1994, Garrett Wollman
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: src/lib/libc/net/gethostnamadr.c,v 1.33 2006/05/21 11:27:28 ume Exp $
26 */
27
28 #include "namespace.h"
29 #include "reentrant.h"
30 #include <sys/param.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
34 #include <netdb.h>
35 #include <stdio.h>
36 #include <ctype.h>
37 #include <errno.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <stdarg.h>
41 #include <nsswitch.h>
42 #include <arpa/nameser.h> /* XXX hack for _res */
43 #include <resolv.h> /* XXX hack for _res */
44 #include "un-namespace.h"
45 #include "netdb_private.h"
46 #ifdef NS_CACHING
47 #include "nscache.h"
48 #endif
49
50 static int gethostbyname_internal(const char *, int, struct hostent *, char *,
51 size_t, struct hostent **, int *, res_state);
52
53 /* Host lookup order if nsswitch.conf is broken or nonexistant */
54 static const ns_src default_src[] = {
55 { NSSRC_FILES, NS_SUCCESS },
56 { NSSRC_DNS, NS_SUCCESS },
57 { 0 }
58 };
59 #ifdef NS_CACHING
60 static int host_id_func(char *, size_t *, va_list, void *);
61 static int host_marshal_func(char *, size_t *, void *, va_list, void *);
62 static int host_unmarshal_func(char *, size_t, void *, va_list, void *);
63 #endif
64
65 NETDB_THREAD_ALLOC(hostent)
NETDB_THREAD_ALLOC(hostent_data)66 NETDB_THREAD_ALLOC(hostent_data)
67 NETDB_THREAD_ALLOC(hostdata)
68
69 static void
70 hostent_free(void *ptr)
71 {
72 free(ptr);
73 }
74
75 static void
hostent_data_free(void * ptr)76 hostent_data_free(void *ptr)
77 {
78 struct hostent_data *hed = ptr;
79
80 if (hed == NULL)
81 return;
82 hed->stayopen = 0;
83 _endhosthtent(hed);
84 free(hed);
85 }
86
87 static void
hostdata_free(void * ptr)88 hostdata_free(void *ptr)
89 {
90 free(ptr);
91 }
92
93 int
__copy_hostent(struct hostent * he,struct hostent * hptr,char * buf,size_t buflen)94 __copy_hostent(struct hostent *he, struct hostent *hptr, char *buf,
95 size_t buflen)
96 {
97 char *cp;
98 char **ptr;
99 int i, n;
100 int nptr, len;
101
102 /* Find out the amount of space required to store the answer. */
103 nptr = 2; /* NULL ptrs */
104 len = (char *)ALIGN(buf) - buf;
105 for (i = 0; he->h_addr_list[i]; i++, nptr++) {
106 len += he->h_length;
107 }
108 for (i = 0; he->h_aliases[i]; i++, nptr++) {
109 len += strlen(he->h_aliases[i]) + 1;
110 }
111 len += strlen(he->h_name) + 1;
112 len += nptr * sizeof(char*);
113
114 if (len > buflen) {
115 errno = ERANGE;
116 return (-1);
117 }
118
119 /* copy address size and type */
120 hptr->h_addrtype = he->h_addrtype;
121 n = hptr->h_length = he->h_length;
122
123 ptr = (char **)ALIGN(buf);
124 cp = (char *)ALIGN(buf) + nptr * sizeof(char *);
125
126 /* copy address list */
127 hptr->h_addr_list = ptr;
128 for (i = 0; he->h_addr_list[i]; i++ , ptr++) {
129 memcpy(cp, he->h_addr_list[i], n);
130 hptr->h_addr_list[i] = cp;
131 cp += n;
132 }
133 hptr->h_addr_list[i] = NULL;
134 ptr++;
135
136 /* copy official name */
137 n = strlen(he->h_name) + 1;
138 strcpy(cp, he->h_name);
139 hptr->h_name = cp;
140 cp += n;
141
142 /* copy aliases */
143 hptr->h_aliases = ptr;
144 for (i = 0 ; he->h_aliases[i]; i++) {
145 n = strlen(he->h_aliases[i]) + 1;
146 strcpy(cp, he->h_aliases[i]);
147 hptr->h_aliases[i] = cp;
148 cp += n;
149 }
150 hptr->h_aliases[i] = NULL;
151
152 return (0);
153 }
154
155 #ifdef NS_CACHING
156 static int
host_id_func(char * buffer,size_t * buffer_size,va_list ap,void * cache_mdata)157 host_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
158 {
159 res_state statp;
160 u_long res_options;
161
162 const int op_id = 1;
163 char *str;
164 void *addr;
165 socklen_t len;
166 int type;
167
168 size_t desired_size, size;
169 enum nss_lookup_type lookup_type;
170 char *p;
171 int res = NS_UNAVAIL;
172
173 statp = __res_state();
174 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
175 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
176
177 lookup_type = (enum nss_lookup_type)cache_mdata;
178 switch (lookup_type) {
179 case nss_lt_name:
180 str = va_arg(ap, char *);
181 type = va_arg(ap, int);
182
183 size = strlen(str);
184 desired_size = sizeof(res_options) + sizeof(int) +
185 sizeof(enum nss_lookup_type) + sizeof(int) + size + 1;
186
187 if (desired_size > *buffer_size) {
188 res = NS_RETURN;
189 goto fin;
190 }
191
192 p = buffer;
193
194 memcpy(p, &res_options, sizeof(res_options));
195 p += sizeof(res_options);
196
197 memcpy(p, &op_id, sizeof(int));
198 p += sizeof(int);
199
200 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
201 p += sizeof(int);
202
203 memcpy(p, &type, sizeof(int));
204 p += sizeof(int);
205
206 memcpy(p, str, size + 1);
207
208 res = NS_SUCCESS;
209 break;
210 case nss_lt_id:
211 addr = va_arg(ap, void *);
212 len = va_arg(ap, socklen_t);
213 type = va_arg(ap, int);
214
215 desired_size = sizeof(res_options) + sizeof(int) +
216 sizeof(enum nss_lookup_type) + sizeof(int) +
217 sizeof(socklen_t) + len;
218
219 if (desired_size > *buffer_size) {
220 res = NS_RETURN;
221 goto fin;
222 }
223
224 p = buffer;
225 memcpy(p, &res_options, sizeof(res_options));
226 p += sizeof(res_options);
227
228 memcpy(p, &op_id, sizeof(int));
229 p += sizeof(int);
230
231 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
232 p += sizeof(int);
233
234 memcpy(p, &type, sizeof(int));
235 p += sizeof(int);
236
237 memcpy(p, &len, sizeof(socklen_t));
238 p += sizeof(socklen_t);
239
240 memcpy(p, addr, len);
241
242 res = NS_SUCCESS;
243 break;
244 default:
245 /* should be unreachable */
246 return (NS_UNAVAIL);
247 }
248
249 fin:
250 *buffer_size = desired_size;
251 return (res);
252 }
253
254 static int
host_marshal_func(char * buffer,size_t * buffer_size,void * retval __unused,va_list ap,void * cache_mdata)255 host_marshal_func(char *buffer, size_t *buffer_size, void *retval __unused,
256 va_list ap, void *cache_mdata)
257 {
258 char *str __unused;
259 void *addr __unused;
260 socklen_t len __unused;
261 int type __unused;
262 struct hostent *ht;
263
264 struct hostent new_ht;
265 size_t desired_size, aliases_size, addr_size, size;
266 char *p, **iter;
267
268 switch ((enum nss_lookup_type)cache_mdata) {
269 case nss_lt_name:
270 str = va_arg(ap, char *);
271 type = va_arg(ap, int);
272 break;
273 case nss_lt_id:
274 addr = va_arg(ap, void *);
275 len = va_arg(ap, socklen_t);
276 type = va_arg(ap, int);
277 break;
278 default:
279 /* should be unreachable */
280 return (NS_UNAVAIL);
281 }
282 ht = va_arg(ap, struct hostent *);
283
284 desired_size = _ALIGNBYTES + sizeof(struct hostent) + sizeof(char *);
285 if (ht->h_name != NULL)
286 desired_size += strlen(ht->h_name) + 1;
287
288 if (ht->h_aliases != NULL) {
289 aliases_size = 0;
290 for (iter = ht->h_aliases; *iter; ++iter) {
291 desired_size += strlen(*iter) + 1;
292 ++aliases_size;
293 }
294
295 desired_size += _ALIGNBYTES +
296 (aliases_size + 1) * sizeof(char *);
297 }
298
299 if (ht->h_addr_list != NULL) {
300 addr_size = 0;
301 for (iter = ht->h_addr_list; *iter; ++iter)
302 ++addr_size;
303
304 desired_size += addr_size * _ALIGN(ht->h_length);
305 desired_size += _ALIGNBYTES + (addr_size + 1) * sizeof(char *);
306 }
307
308 if (desired_size > *buffer_size) {
309 /* this assignment is here for future use */
310 *buffer_size = desired_size;
311 return (NS_RETURN);
312 }
313
314 memcpy(&new_ht, ht, sizeof(struct hostent));
315 memset(buffer, 0, desired_size);
316
317 *buffer_size = desired_size;
318 p = buffer + sizeof(struct hostent) + sizeof(char *);
319 memcpy(buffer + sizeof(struct hostent), &p, sizeof(char *));
320 p = (char *)_ALIGN(p);
321
322 if (new_ht.h_name != NULL) {
323 size = strlen(new_ht.h_name);
324 memcpy(p, new_ht.h_name, size);
325 new_ht.h_name = p;
326 p += size + 1;
327 }
328
329 if (new_ht.h_aliases != NULL) {
330 p = (char *)_ALIGN(p);
331 memcpy(p, new_ht.h_aliases, sizeof(char *) * aliases_size);
332 new_ht.h_aliases = (char **)p;
333 p += sizeof(char *) * (aliases_size + 1);
334
335 for (iter = new_ht.h_aliases; *iter; ++iter) {
336 size = strlen(*iter);
337 memcpy(p, *iter, size);
338 *iter = p;
339 p += size + 1;
340 }
341 }
342
343 if (new_ht.h_addr_list != NULL) {
344 p = (char *)_ALIGN(p);
345 memcpy(p, new_ht.h_addr_list, sizeof(char *) * addr_size);
346 new_ht.h_addr_list = (char **)p;
347 p += sizeof(char *) * (addr_size + 1);
348
349 size = _ALIGN(new_ht.h_length);
350 for (iter = new_ht.h_addr_list; *iter; ++iter) {
351 memcpy(p, *iter, size);
352 *iter = p;
353 p += size + 1;
354 }
355 }
356 memcpy(buffer, &new_ht, sizeof(struct hostent));
357 return (NS_SUCCESS);
358 }
359
360 static int
host_unmarshal_func(char * buffer,size_t buffer_size,void * retval,va_list ap,void * cache_mdata)361 host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
362 void *cache_mdata)
363 {
364 char *str __unused;
365 void *addr __unused;
366 socklen_t len __unused;
367 int type __unused;
368 struct hostent *ht;
369
370 char *p;
371 char **iter;
372 char *orig_buf;
373 size_t orig_buf_size;
374
375 switch ((enum nss_lookup_type)cache_mdata) {
376 case nss_lt_name:
377 str = va_arg(ap, char *);
378 type = va_arg(ap, int);
379 break;
380 case nss_lt_id:
381 addr = va_arg(ap, void *);
382 len = va_arg(ap, socklen_t);
383 type = va_arg(ap, int);
384 break;
385 default:
386 /* should be unreachable */
387 return (NS_UNAVAIL);
388 }
389
390 ht = va_arg(ap, struct hostent *);
391 orig_buf = va_arg(ap, char *);
392 orig_buf_size = va_arg(ap, size_t);
393
394 if (orig_buf_size <
395 buffer_size - sizeof(struct hostent) - sizeof(char *)) {
396 errno = ERANGE;
397 return (NS_RETURN);
398 }
399
400 memcpy(ht, buffer, sizeof(struct hostent));
401 memcpy(&p, buffer + sizeof(struct hostent), sizeof(char *));
402
403 orig_buf = (char *)_ALIGN(orig_buf);
404 memcpy(orig_buf, buffer + sizeof(struct hostent) + sizeof(char *) +
405 _ALIGN(p) - (size_t)p,
406 buffer_size - sizeof(struct hostent) - sizeof(char *) -
407 _ALIGN(p) + (size_t)p);
408 p = (char *)_ALIGN(p);
409
410 NS_APPLY_OFFSET(ht->h_name, orig_buf, p, char *);
411 if (ht->h_aliases != NULL) {
412 NS_APPLY_OFFSET(ht->h_aliases, orig_buf, p, char **);
413
414 for (iter = ht->h_aliases; *iter; ++iter)
415 NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
416 }
417
418 if (ht->h_addr_list != NULL) {
419 NS_APPLY_OFFSET(ht->h_addr_list, orig_buf, p, char **);
420
421 for (iter = ht->h_addr_list; *iter; ++iter)
422 NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
423 }
424
425 *((struct hostent **)retval) = ht;
426 return (NS_SUCCESS);
427 }
428 #endif /* NS_CACHING */
429
430 static int
fakeaddr(const char * name,int af,struct hostent * hp,char * buf,size_t buflen,res_state statp)431 fakeaddr(const char *name, int af, struct hostent *hp, char *buf,
432 size_t buflen, res_state statp)
433 {
434 struct hostent_data *hed;
435 struct hostent he;
436
437 if ((hed = __hostent_data_init()) == NULL) {
438 errno = ENOMEM;
439 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
440 return (-1);
441 }
442
443 if ((af != AF_INET ||
444 inet_aton(name, (struct in_addr *)hed->host_addr) != 1) &&
445 inet_pton(af, name, hed->host_addr) != 1) {
446 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
447 return (-1);
448 }
449 strncpy(hed->hostbuf, name, MAXDNAME);
450 hed->hostbuf[MAXDNAME] = '\0';
451 if (af == AF_INET && (statp->options & RES_USE_INET6) != 0U) {
452 _map_v4v6_address((char *)hed->host_addr,
453 (char *)hed->host_addr);
454 af = AF_INET6;
455 }
456 he.h_addrtype = af;
457 switch(af) {
458 case AF_INET:
459 he.h_length = NS_INADDRSZ;
460 break;
461 case AF_INET6:
462 he.h_length = NS_IN6ADDRSZ;
463 break;
464 default:
465 errno = EAFNOSUPPORT;
466 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
467 return (-1);
468 }
469 he.h_name = hed->hostbuf;
470 he.h_aliases = hed->host_aliases;
471 hed->host_aliases[0] = NULL;
472 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
473 hed->h_addr_ptrs[1] = NULL;
474 he.h_addr_list = hed->h_addr_ptrs;
475 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
476 return (__copy_hostent(&he, hp, buf, buflen));
477 }
478
479 int
gethostbyname_r(const char * name,struct hostent * he,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)480 gethostbyname_r(const char *name, struct hostent *he, char *buffer,
481 size_t buflen, struct hostent **result, int *h_errnop)
482 {
483 res_state statp;
484
485 statp = __res_state();
486 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
487 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
488 return (-1);
489 }
490 if (statp->options & RES_USE_INET6) {
491 if (fakeaddr(name, AF_INET, he, buffer, buflen, statp) == 0) {
492 *result = he;
493 return (0);
494 }
495 if (gethostbyname_internal(name, AF_INET6, he, buffer, buflen,
496 result, h_errnop, statp) == 0)
497 return (0);
498 }
499 return (gethostbyname_internal(name, AF_INET, he, buffer, buflen,
500 result, h_errnop, statp));
501 }
502
503 int
gethostbyname2_r(const char * name,int af,struct hostent * he,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)504 gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer,
505 size_t buflen, struct hostent **result, int *h_errnop)
506 {
507 res_state statp;
508
509 statp = __res_state();
510 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
511 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
512 return (-1);
513 }
514 return (gethostbyname_internal(name, af, he, buffer, buflen, result,
515 h_errnop, statp));
516 }
517
518 static int
gethostbyname_internal(const char * name,int af,struct hostent * hp,char * buf,size_t buflen,struct hostent ** result,int * h_errnop,res_state statp)519 gethostbyname_internal(const char *name, int af, struct hostent *hp, char *buf,
520 size_t buflen, struct hostent **result, int *h_errnop,
521 res_state statp)
522 {
523 const char *cp;
524 int rval, ret_errno;
525 char abuf[MAXDNAME];
526
527 #ifdef NS_CACHING
528 static const nss_cache_info cache_info =
529 NS_COMMON_CACHE_INFO_INITIALIZER(
530 hosts, (void *)nss_lt_name,
531 host_id_func, host_marshal_func, host_unmarshal_func);
532 #endif
533 static const ns_dtab dtab[] = {
534 NS_FILES_CB(_ht_gethostbyname, NULL)
535 { NSSRC_DNS, _dns_gethostbyname, NULL },
536 NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
537 #ifdef NS_CACHING
538 NS_CACHE_CB(&cache_info)
539 #endif
540 { 0 }
541 };
542
543 switch (af) {
544 case AF_INET:
545 case AF_INET6:
546 break;
547 default:
548 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
549 *h_errnop = statp->res_h_errno;
550 errno = EAFNOSUPPORT;
551 return (-1);
552 }
553
554 /*
555 * if there aren't any dots, it could be a user-level alias.
556 * this is also done in res_query() since we are not the only
557 * function that looks up host names.
558 */
559 if (!strchr(name, '.') &&
560 (cp = res_hostalias(statp, name, abuf, sizeof abuf)))
561 name = cp;
562
563 if (fakeaddr(name, af, hp, buf, buflen, statp) == 0) {
564 *result = hp;
565 return (0);
566 }
567
568 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
569 "gethostbyname2_r", default_src, name, af, hp, buf, buflen,
570 &ret_errno, h_errnop);
571
572 return ((rval == NS_SUCCESS) ? 0 : -1);
573 }
574
575 int
gethostbyaddr_r(const void * addr,socklen_t len,int af,struct hostent * hp,char * buf,size_t buflen,struct hostent ** result,int * h_errnop)576 gethostbyaddr_r(const void *addr, socklen_t len, int af, struct hostent *hp,
577 char *buf, size_t buflen, struct hostent **result,
578 int *h_errnop)
579 {
580 const u_char *uaddr = (const u_char *)addr;
581 const struct in6_addr *addr6;
582 socklen_t size;
583 int rval, ret_errno;
584 res_state statp;
585
586 #ifdef NS_CACHING
587 static const nss_cache_info cache_info =
588 NS_COMMON_CACHE_INFO_INITIALIZER(
589 hosts, (void *)nss_lt_id,
590 host_id_func, host_marshal_func, host_unmarshal_func);
591 #endif
592 static const ns_dtab dtab[] = {
593 NS_FILES_CB(_ht_gethostbyaddr, NULL)
594 { NSSRC_DNS, _dns_gethostbyaddr, NULL },
595 NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
596 #ifdef NS_CACHING
597 NS_CACHE_CB(&cache_info)
598 #endif
599 { 0 }
600 };
601
602 statp = __res_state();
603 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
604 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
605 *h_errnop = statp->res_h_errno;
606 return (-1);
607 }
608
609 if (af == AF_INET6 && len == NS_IN6ADDRSZ) {
610 addr6 = (const struct in6_addr *)addr;
611 if (IN6_IS_ADDR_LINKLOCAL(addr6)) {
612 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
613 *h_errnop = statp->res_h_errno;
614 return (-1);
615 }
616 if (IN6_IS_ADDR_V4MAPPED(addr6) ||
617 IN6_IS_ADDR_V4COMPAT(addr6)) {
618 /* Unmap. */
619 uaddr += NS_IN6ADDRSZ - NS_INADDRSZ;
620 af = AF_INET;
621 len = NS_INADDRSZ;
622 }
623 }
624 switch (af) {
625 case AF_INET:
626 size = NS_INADDRSZ;
627 break;
628 case AF_INET6:
629 size = NS_IN6ADDRSZ;
630 break;
631 default:
632 errno = EAFNOSUPPORT;
633 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
634 *h_errnop = statp->res_h_errno;
635 return (-1);
636 }
637 if (size != len) {
638 errno = EINVAL;
639 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
640 *h_errnop = statp->res_h_errno;
641 return (-1);
642 }
643
644 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
645 "gethostbyaddr_r", default_src, uaddr, len, af, hp, buf, buflen,
646 &ret_errno, h_errnop);
647
648 return ((rval == NS_SUCCESS) ? 0 : -1);
649 }
650
651 struct hostent *
gethostbyname(const char * name)652 gethostbyname(const char *name)
653 {
654 struct hostdata *hd;
655 struct hostent *rval;
656 int ret_h_errno;
657
658 if ((hd = __hostdata_init()) == NULL)
659 return (NULL);
660 if (gethostbyname_r(name, &hd->host, hd->data, sizeof(hd->data), &rval,
661 &ret_h_errno) != 0)
662 return (NULL);
663 return (rval);
664 }
665
666 struct hostent *
gethostbyname2(const char * name,int af)667 gethostbyname2(const char *name, int af)
668 {
669 struct hostdata *hd;
670 struct hostent *rval;
671 int ret_h_errno;
672
673 if ((hd = __hostdata_init()) == NULL)
674 return (NULL);
675 if (gethostbyname2_r(name, af, &hd->host, hd->data, sizeof(hd->data),
676 &rval, &ret_h_errno) != 0)
677 return (NULL);
678 return (rval);
679 }
680
681 struct hostent *
gethostbyaddr(const void * addr,socklen_t len,int af)682 gethostbyaddr(const void *addr, socklen_t len, int af)
683 {
684 struct hostdata *hd;
685 struct hostent *rval;
686 int ret_h_errno;
687
688 if ((hd = __hostdata_init()) == NULL)
689 return (NULL);
690 if (gethostbyaddr_r(addr, len, af, &hd->host, hd->data,
691 sizeof(hd->data), &rval, &ret_h_errno) != 0)
692 return (NULL);
693 return (rval);
694 }
695
696 void
sethostent(int stayopen)697 sethostent(int stayopen)
698 {
699 struct hostent_data *hed;
700
701 if ((hed = __hostent_data_init()) == NULL)
702 return;
703 _sethosthtent(stayopen, hed);
704 _sethostdnsent(stayopen);
705 }
706
707 void
endhostent(void)708 endhostent(void)
709 {
710 struct hostent_data *hed;
711
712 if ((hed = __hostent_data_init()) == NULL)
713 return;
714 _endhosthtent(hed);
715 _endhostdnsent();
716 }
717