1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1994, Garrett Wollman
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include "namespace.h"
30 #include "reentrant.h"
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
35 #include <netdb.h>
36 #include <stdio.h>
37 #include <ctype.h>
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <stdarg.h>
42 #include <nsswitch.h>
43 #include <arpa/nameser.h> /* XXX hack for _res */
44 #include <resolv.h> /* XXX hack for _res */
45 #include "un-namespace.h"
46 #include "netdb_private.h"
47 #ifdef NS_CACHING
48 #include "nscache.h"
49 #endif
50
51 static int gethostbyname_internal(const char *, int, struct hostent *, char *,
52 size_t, struct hostent **, int *, res_state);
53
54 /* Host lookup order if nsswitch.conf is broken or nonexistent */
55 static const ns_src default_src[] = {
56 { NSSRC_FILES, NS_SUCCESS },
57 { NSSRC_DNS, NS_SUCCESS },
58 { 0 }
59 };
60 #ifdef NS_CACHING
61 static int host_id_func(char *, size_t *, va_list, void *);
62 static int host_marshal_func(char *, size_t *, void *, va_list, void *);
63 static int host_unmarshal_func(char *, size_t, void *, va_list, void *);
64 #endif
65
66 NETDB_THREAD_ALLOC(hostent)
NETDB_THREAD_ALLOC(hostent_data)67 NETDB_THREAD_ALLOC(hostent_data)
68 NETDB_THREAD_ALLOC(hostdata)
69
70 static void
71 hostent_free(void *ptr)
72 {
73 free(ptr);
74 }
75
76 static void
hostent_data_free(void * ptr)77 hostent_data_free(void *ptr)
78 {
79 struct hostent_data *hed = ptr;
80
81 if (hed == NULL)
82 return;
83 hed->stayopen = 0;
84 _endhosthtent(hed);
85 free(hed);
86 }
87
88 static void
hostdata_free(void * ptr)89 hostdata_free(void *ptr)
90 {
91 free(ptr);
92 }
93
94 int
__copy_hostent(struct hostent * he,struct hostent * hptr,char * buf,size_t buflen)95 __copy_hostent(struct hostent *he, struct hostent *hptr, char *buf,
96 size_t buflen)
97 {
98 char *cp;
99 char **ptr;
100 int i, n;
101 int nptr, len;
102
103 /* Find out the amount of space required to store the answer. */
104 nptr = 2; /* NULL ptrs */
105 len = (char *)ALIGN(buf) - buf;
106 for (i = 0; he->h_addr_list[i]; i++, nptr++) {
107 len += he->h_length;
108 }
109 for (i = 0; he->h_aliases[i]; i++, nptr++) {
110 len += strlen(he->h_aliases[i]) + 1;
111 }
112 len += strlen(he->h_name) + 1;
113 len += nptr * sizeof(char*);
114
115 if (len > buflen) {
116 errno = ERANGE;
117 return (-1);
118 }
119
120 /* copy address size and type */
121 hptr->h_addrtype = he->h_addrtype;
122 n = hptr->h_length = he->h_length;
123
124 ptr = (char **)ALIGN(buf);
125 cp = (char *)ALIGN(buf) + nptr * sizeof(char *);
126
127 /* copy address list */
128 hptr->h_addr_list = ptr;
129 for (i = 0; he->h_addr_list[i]; i++ , ptr++) {
130 memcpy(cp, he->h_addr_list[i], n);
131 hptr->h_addr_list[i] = cp;
132 cp += n;
133 }
134 hptr->h_addr_list[i] = NULL;
135 ptr++;
136
137 /* copy official name */
138 n = strlen(he->h_name) + 1;
139 strcpy(cp, he->h_name);
140 hptr->h_name = cp;
141 cp += n;
142
143 /* copy aliases */
144 hptr->h_aliases = ptr;
145 for (i = 0 ; he->h_aliases[i]; i++) {
146 n = strlen(he->h_aliases[i]) + 1;
147 strcpy(cp, he->h_aliases[i]);
148 hptr->h_aliases[i] = cp;
149 cp += n;
150 }
151 hptr->h_aliases[i] = NULL;
152
153 return (0);
154 }
155
156 #ifdef NS_CACHING
157 static int
host_id_func(char * buffer,size_t * buffer_size,va_list ap,void * cache_mdata)158 host_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
159 {
160 res_state statp;
161 u_long res_options;
162
163 const int op_id = 1;
164 char *str;
165 void *addr;
166 socklen_t len;
167 int type;
168
169 size_t desired_size, size;
170 enum nss_lookup_type lookup_type;
171 char *p;
172 int res = NS_UNAVAIL;
173
174 statp = __res_state();
175 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
176 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
177
178 lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata;
179 switch (lookup_type) {
180 case nss_lt_name:
181 str = va_arg(ap, char *);
182 type = va_arg(ap, int);
183
184 size = strlen(str);
185 desired_size = sizeof(res_options) + sizeof(int) +
186 sizeof(enum nss_lookup_type) + sizeof(int) + size + 1;
187
188 if (desired_size > *buffer_size) {
189 res = NS_RETURN;
190 goto fin;
191 }
192
193 p = buffer;
194
195 memcpy(p, &res_options, sizeof(res_options));
196 p += sizeof(res_options);
197
198 memcpy(p, &op_id, sizeof(int));
199 p += sizeof(int);
200
201 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
202 p += sizeof(int);
203
204 memcpy(p, &type, sizeof(int));
205 p += sizeof(int);
206
207 memcpy(p, str, size + 1);
208
209 res = NS_SUCCESS;
210 break;
211 case nss_lt_id:
212 addr = va_arg(ap, void *);
213 len = va_arg(ap, socklen_t);
214 type = va_arg(ap, int);
215
216 desired_size = sizeof(res_options) + sizeof(int) +
217 sizeof(enum nss_lookup_type) + sizeof(int) +
218 sizeof(socklen_t) + len;
219
220 if (desired_size > *buffer_size) {
221 res = NS_RETURN;
222 goto fin;
223 }
224
225 p = buffer;
226 memcpy(p, &res_options, sizeof(res_options));
227 p += sizeof(res_options);
228
229 memcpy(p, &op_id, sizeof(int));
230 p += sizeof(int);
231
232 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
233 p += sizeof(int);
234
235 memcpy(p, &type, sizeof(int));
236 p += sizeof(int);
237
238 memcpy(p, &len, sizeof(socklen_t));
239 p += sizeof(socklen_t);
240
241 memcpy(p, addr, len);
242
243 res = NS_SUCCESS;
244 break;
245 default:
246 /* should be unreachable */
247 return (NS_UNAVAIL);
248 }
249
250 fin:
251 *buffer_size = desired_size;
252 return (res);
253 }
254
255 static int
host_marshal_func(char * buffer,size_t * buffer_size,void * retval,va_list ap,void * cache_mdata)256 host_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
257 void *cache_mdata)
258 {
259 char *str __unused;
260 void *addr __unused;
261 socklen_t len __unused;
262 int type __unused;
263 struct hostent *ht;
264
265 struct hostent new_ht;
266 size_t desired_size, aliases_size, addr_size, size;
267 char *p, **iter;
268
269 switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
270 case nss_lt_name:
271 str = va_arg(ap, char *);
272 type = va_arg(ap, int);
273 break;
274 case nss_lt_id:
275 addr = va_arg(ap, void *);
276 len = va_arg(ap, socklen_t);
277 type = va_arg(ap, int);
278 break;
279 default:
280 /* should be unreachable */
281 return (NS_UNAVAIL);
282 }
283 ht = va_arg(ap, struct hostent *);
284
285 desired_size = _ALIGNBYTES + sizeof(struct hostent) + sizeof(char *);
286 if (ht->h_name != NULL)
287 desired_size += strlen(ht->h_name) + 1;
288
289 if (ht->h_aliases != NULL) {
290 aliases_size = 0;
291 for (iter = ht->h_aliases; *iter; ++iter) {
292 desired_size += strlen(*iter) + 1;
293 ++aliases_size;
294 }
295
296 desired_size += _ALIGNBYTES +
297 (aliases_size + 1) * sizeof(char *);
298 }
299
300 if (ht->h_addr_list != NULL) {
301 addr_size = 0;
302 for (iter = ht->h_addr_list; *iter; ++iter)
303 ++addr_size;
304
305 desired_size += addr_size * _ALIGN(ht->h_length);
306 desired_size += _ALIGNBYTES + (addr_size + 1) * sizeof(char *);
307 }
308
309 if (desired_size > *buffer_size) {
310 /* this assignment is here for future use */
311 *buffer_size = desired_size;
312 return (NS_RETURN);
313 }
314
315 memcpy(&new_ht, ht, sizeof(struct hostent));
316 memset(buffer, 0, desired_size);
317
318 *buffer_size = desired_size;
319 p = buffer + sizeof(struct hostent) + sizeof(char *);
320 memcpy(buffer + sizeof(struct hostent), &p, sizeof(char *));
321 p = (char *)_ALIGN(p);
322
323 if (new_ht.h_name != NULL) {
324 size = strlen(new_ht.h_name);
325 memcpy(p, new_ht.h_name, size);
326 new_ht.h_name = p;
327 p += size + 1;
328 }
329
330 if (new_ht.h_aliases != NULL) {
331 p = (char *)_ALIGN(p);
332 memcpy(p, new_ht.h_aliases, sizeof(char *) * aliases_size);
333 new_ht.h_aliases = (char **)p;
334 p += sizeof(char *) * (aliases_size + 1);
335
336 for (iter = new_ht.h_aliases; *iter; ++iter) {
337 size = strlen(*iter);
338 memcpy(p, *iter, size);
339 *iter = p;
340 p += size + 1;
341 }
342 }
343
344 if (new_ht.h_addr_list != NULL) {
345 p = (char *)_ALIGN(p);
346 memcpy(p, new_ht.h_addr_list, sizeof(char *) * addr_size);
347 new_ht.h_addr_list = (char **)p;
348 p += sizeof(char *) * (addr_size + 1);
349
350 size = _ALIGN(new_ht.h_length);
351 for (iter = new_ht.h_addr_list; *iter; ++iter) {
352 memcpy(p, *iter, size);
353 *iter = p;
354 p += size + 1;
355 }
356 }
357 memcpy(buffer, &new_ht, sizeof(struct hostent));
358 return (NS_SUCCESS);
359 }
360
361 static int
host_unmarshal_func(char * buffer,size_t buffer_size,void * retval,va_list ap,void * cache_mdata)362 host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
363 void *cache_mdata)
364 {
365 char *str __unused;
366 void *addr __unused;
367 socklen_t len __unused;
368 int type __unused;
369 struct hostent *ht;
370
371 char *p;
372 char **iter;
373 char *orig_buf;
374 size_t orig_buf_size;
375
376 switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
377 case nss_lt_name:
378 str = va_arg(ap, char *);
379 type = va_arg(ap, int);
380 break;
381 case nss_lt_id:
382 addr = va_arg(ap, void *);
383 len = va_arg(ap, socklen_t);
384 type = va_arg(ap, int);
385 break;
386 default:
387 /* should be unreachable */
388 return (NS_UNAVAIL);
389 }
390
391 ht = va_arg(ap, struct hostent *);
392 orig_buf = va_arg(ap, char *);
393 orig_buf_size = va_arg(ap, size_t);
394
395 if (orig_buf_size <
396 buffer_size - sizeof(struct hostent) - sizeof(char *)) {
397 errno = ERANGE;
398 return (NS_RETURN);
399 }
400
401 memcpy(ht, buffer, sizeof(struct hostent));
402 memcpy(&p, buffer + sizeof(struct hostent), sizeof(char *));
403
404 orig_buf = (char *)_ALIGN(orig_buf);
405 memcpy(orig_buf, buffer + sizeof(struct hostent) + sizeof(char *) +
406 _ALIGN(p) - (size_t)p,
407 buffer_size - sizeof(struct hostent) - sizeof(char *) -
408 _ALIGN(p) + (size_t)p);
409 p = (char *)_ALIGN(p);
410
411 NS_APPLY_OFFSET(ht->h_name, orig_buf, p, char *);
412 if (ht->h_aliases != NULL) {
413 NS_APPLY_OFFSET(ht->h_aliases, orig_buf, p, char **);
414
415 for (iter = ht->h_aliases; *iter; ++iter)
416 NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
417 }
418
419 if (ht->h_addr_list != NULL) {
420 NS_APPLY_OFFSET(ht->h_addr_list, orig_buf, p, char **);
421
422 for (iter = ht->h_addr_list; *iter; ++iter)
423 NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
424 }
425
426 *((struct hostent **)retval) = ht;
427 return (NS_SUCCESS);
428 }
429 #endif /* NS_CACHING */
430
431 static int
fakeaddr(const char * name,int af,struct hostent * hp,char * buf,size_t buflen,res_state statp)432 fakeaddr(const char *name, int af, struct hostent *hp, char *buf,
433 size_t buflen, res_state statp)
434 {
435 struct hostent_data *hed;
436 struct hostent he;
437
438 if ((hed = __hostent_data_init()) == NULL) {
439 errno = ENOMEM;
440 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
441 return (-1);
442 }
443
444 if ((af != AF_INET ||
445 inet_aton(name, (struct in_addr *)hed->host_addr) != 1) &&
446 inet_pton(af, name, hed->host_addr) != 1) {
447 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
448 return (-1);
449 }
450 strncpy(hed->hostbuf, name, MAXDNAME);
451 hed->hostbuf[MAXDNAME] = '\0';
452 if (af == AF_INET && (statp->options & RES_USE_INET6) != 0U) {
453 _map_v4v6_address((char *)hed->host_addr,
454 (char *)hed->host_addr);
455 af = AF_INET6;
456 }
457 he.h_addrtype = af;
458 switch(af) {
459 case AF_INET:
460 he.h_length = NS_INADDRSZ;
461 break;
462 case AF_INET6:
463 he.h_length = NS_IN6ADDRSZ;
464 break;
465 default:
466 errno = EAFNOSUPPORT;
467 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
468 return (-1);
469 }
470 he.h_name = hed->hostbuf;
471 he.h_aliases = hed->host_aliases;
472 hed->host_aliases[0] = NULL;
473 hed->h_addr_ptrs[0] = (char *)hed->host_addr;
474 hed->h_addr_ptrs[1] = NULL;
475 he.h_addr_list = hed->h_addr_ptrs;
476 if (__copy_hostent(&he, hp, buf, buflen) != 0) {
477 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
478 return (-1);
479 }
480 RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
481 return (0);
482 }
483
484 int
gethostbyname_r(const char * name,struct hostent * he,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)485 gethostbyname_r(const char *name, struct hostent *he, char *buffer,
486 size_t buflen, struct hostent **result, int *h_errnop)
487 {
488 res_state statp;
489
490 statp = __res_state();
491 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
492 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
493 return (-1);
494 }
495 if (statp->options & RES_USE_INET6) {
496 if (fakeaddr(name, AF_INET, he, buffer, buflen, statp) == 0) {
497 *result = he;
498 return (0);
499 }
500 if (gethostbyname_internal(name, AF_INET6, he, buffer, buflen,
501 result, h_errnop, statp) == 0)
502 return (0);
503 }
504 return (gethostbyname_internal(name, AF_INET, he, buffer, buflen,
505 result, h_errnop, statp));
506 }
507
508 int
gethostbyname2_r(const char * name,int af,struct hostent * he,char * buffer,size_t buflen,struct hostent ** result,int * h_errnop)509 gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer,
510 size_t buflen, struct hostent **result, int *h_errnop)
511 {
512 res_state statp;
513
514 statp = __res_state();
515 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
516 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
517 return (-1);
518 }
519 return (gethostbyname_internal(name, af, he, buffer, buflen, result,
520 h_errnop, statp));
521 }
522
523 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)524 gethostbyname_internal(const char *name, int af, struct hostent *hp, char *buf,
525 size_t buflen, struct hostent **result, int *h_errnop, res_state statp)
526 {
527 const char *cp;
528 int rval, ret_errno = 0;
529 char abuf[MAXDNAME];
530
531 #ifdef NS_CACHING
532 static const nss_cache_info cache_info =
533 NS_COMMON_CACHE_INFO_INITIALIZER(
534 hosts, (void *)nss_lt_name,
535 host_id_func, host_marshal_func, host_unmarshal_func);
536 #endif
537 static const ns_dtab dtab[] = {
538 NS_FILES_CB(_ht_gethostbyname, NULL)
539 { NSSRC_DNS, _dns_gethostbyname, NULL },
540 NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
541 #ifdef NS_CACHING
542 NS_CACHE_CB(&cache_info)
543 #endif
544 { 0 }
545 };
546
547 switch (af) {
548 case AF_INET:
549 case AF_INET6:
550 break;
551 default:
552 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
553 *h_errnop = statp->res_h_errno;
554 errno = EAFNOSUPPORT;
555 return (-1);
556 }
557
558 /*
559 * if there aren't any dots, it could be a user-level alias.
560 * this is also done in res_query() since we are not the only
561 * function that looks up host names.
562 */
563 if (!strchr(name, '.') &&
564 (cp = res_hostalias(statp, name, abuf, sizeof abuf)))
565 name = cp;
566
567 if (fakeaddr(name, af, hp, buf, buflen, statp) == 0) {
568 *result = hp;
569 return (0);
570 }
571
572 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
573 "gethostbyname2_r", default_src, name, af, hp, buf, buflen,
574 &ret_errno, h_errnop);
575
576 if (rval != NS_SUCCESS) {
577 errno = ret_errno;
578 return ((ret_errno != 0) ? ret_errno : -1);
579 }
580 return (0);
581 }
582
583 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)584 gethostbyaddr_r(const void *addr, socklen_t len, int af, struct hostent *hp,
585 char *buf, size_t buflen, struct hostent **result, int *h_errnop)
586 {
587 const u_char *uaddr = (const u_char *)addr;
588 const struct in6_addr *addr6;
589 socklen_t size;
590 int rval, ret_errno = 0;
591 res_state statp;
592
593 #ifdef NS_CACHING
594 static const nss_cache_info cache_info =
595 NS_COMMON_CACHE_INFO_INITIALIZER(
596 hosts, (void *)nss_lt_id,
597 host_id_func, host_marshal_func, host_unmarshal_func);
598 #endif
599 static const ns_dtab dtab[] = {
600 NS_FILES_CB(_ht_gethostbyaddr, NULL)
601 { NSSRC_DNS, _dns_gethostbyaddr, NULL },
602 NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
603 #ifdef NS_CACHING
604 NS_CACHE_CB(&cache_info)
605 #endif
606 { 0 }
607 };
608
609 statp = __res_state();
610 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
611 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
612 *h_errnop = statp->res_h_errno;
613 return (-1);
614 }
615
616 if (af == AF_INET6 && len == NS_IN6ADDRSZ) {
617 addr6 = (const struct in6_addr *)addr;
618 if (IN6_IS_ADDR_LINKLOCAL(addr6)) {
619 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
620 *h_errnop = statp->res_h_errno;
621 return (-1);
622 }
623 if (IN6_IS_ADDR_V4MAPPED(addr6) ||
624 IN6_IS_ADDR_V4COMPAT(addr6)) {
625 /* Unmap. */
626 uaddr += NS_IN6ADDRSZ - NS_INADDRSZ;
627 af = AF_INET;
628 len = NS_INADDRSZ;
629 }
630 }
631 switch (af) {
632 case AF_INET:
633 size = NS_INADDRSZ;
634 break;
635 case AF_INET6:
636 size = NS_IN6ADDRSZ;
637 break;
638 default:
639 errno = EAFNOSUPPORT;
640 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
641 *h_errnop = statp->res_h_errno;
642 return (-1);
643 }
644 if (size != len) {
645 errno = EINVAL;
646 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
647 *h_errnop = statp->res_h_errno;
648 return (-1);
649 }
650
651 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
652 "gethostbyaddr_r", default_src, uaddr, len, af, hp, buf, buflen,
653 &ret_errno, h_errnop);
654
655 if (rval != NS_SUCCESS) {
656 errno = ret_errno;
657 return ((ret_errno != 0) ? ret_errno : -1);
658 }
659 return (0);
660 }
661
662 struct hostent *
gethostbyname(const char * name)663 gethostbyname(const char *name)
664 {
665 struct hostdata *hd;
666 struct hostent *rval;
667 int ret_h_errno;
668
669 if ((hd = __hostdata_init()) == NULL)
670 return (NULL);
671 if (gethostbyname_r(name, &hd->host, hd->data, sizeof(hd->data), &rval,
672 &ret_h_errno) != 0)
673 return (NULL);
674 return (rval);
675 }
676
677 struct hostent *
gethostbyname2(const char * name,int af)678 gethostbyname2(const char *name, int af)
679 {
680 struct hostdata *hd;
681 struct hostent *rval;
682 int ret_h_errno;
683
684 if ((hd = __hostdata_init()) == NULL)
685 return (NULL);
686 if (gethostbyname2_r(name, af, &hd->host, hd->data, sizeof(hd->data),
687 &rval, &ret_h_errno) != 0)
688 return (NULL);
689 return (rval);
690 }
691
692 struct hostent *
gethostbyaddr(const void * addr,socklen_t len,int af)693 gethostbyaddr(const void *addr, socklen_t len, int af)
694 {
695 struct hostdata *hd;
696 struct hostent *rval;
697 int ret_h_errno;
698
699 if ((hd = __hostdata_init()) == NULL)
700 return (NULL);
701 if (gethostbyaddr_r(addr, len, af, &hd->host, hd->data,
702 sizeof(hd->data), &rval, &ret_h_errno) != 0)
703 return (NULL);
704 return (rval);
705 }
706
707 void
sethostent(int stayopen)708 sethostent(int stayopen)
709 {
710 struct hostent_data *hed;
711
712 if ((hed = __hostent_data_init()) == NULL)
713 return;
714 _sethosthtent(stayopen, hed);
715 _sethostdnsent(stayopen);
716 }
717
718 void
endhostent(void)719 endhostent(void)
720 {
721 struct hostent_data *hed;
722
723 if ((hed = __hostent_data_init()) == NULL)
724 return;
725 _endhosthtent(hed);
726 _endhostdnsent();
727 }
728