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
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/lib/libc/net/gethostnamadr.c 360415 2020-04-27 23:49:13Z brooks $");
28
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
51static 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 */
55static const ns_src default_src[] = {
56	{ NSSRC_FILES, NS_SUCCESS },
57	{ NSSRC_DNS, NS_SUCCESS },
58	{ 0 }
59};
60#ifdef NS_CACHING
61static int host_id_func(char *, size_t *, va_list, void *);
62static int host_marshal_func(char *, size_t *, void *, va_list, void *);
63static int host_unmarshal_func(char *, size_t, void *, va_list, void *);
64#endif
65
66NETDB_THREAD_ALLOC(hostent)
67NETDB_THREAD_ALLOC(hostent_data)
68NETDB_THREAD_ALLOC(hostdata)
69
70static void
71hostent_free(void *ptr)
72{
73	free(ptr);
74}
75
76static void
77hostent_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
88static void
89hostdata_free(void *ptr)
90{
91	free(ptr);
92}
93
94int
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
157static int
158host_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
250fin:
251	*buffer_size = desired_size;
252	return (res);
253}
254
255static int
256host_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
257    void *cache_mdata)
258{
259	char *str;
260	void *addr;
261	socklen_t len;
262	int type;
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
361static int
362host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
363    void *cache_mdata)
364{
365	char *str;
366	void *addr;
367	socklen_t len;
368	int type;
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
431static int
432fakeaddr(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
484int
485gethostbyname_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
508int
509gethostbyname2_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
523int
524gethostbyname_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
583int
584gethostbyaddr_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
662struct hostent *
663gethostbyname(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
677struct hostent *
678gethostbyname2(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
692struct hostent *
693gethostbyaddr(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
707void
708sethostent(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
718void
719endhostent(void)
720{
721	struct hostent_data *hed;
722
723	if ((hed = __hostent_data_init()) == NULL)
724		return;
725	_endhosthtent(hed);
726	_endhostdnsent();
727}
728