1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
30
31#include "namespace.h"
32#include "reentrant.h"
33#include <sys/param.h>
34#include <sys/socket.h>
35#include <netinet/in.h>
36#include <arpa/inet.h>
37#include <netdb.h>
38#include <stdio.h>
39#include <ctype.h>
40#include <errno.h>
41#include <stdlib.h>
42#include <string.h>
43#include <stdarg.h>
44#include <nsswitch.h>
45#include <arpa/nameser.h>		/* XXX hack for _res */
46#include <resolv.h>			/* XXX hack for _res */
47#include "un-namespace.h"
48#include "netdb_private.h"
49#ifdef NS_CACHING
50#include "nscache.h"
51#endif
52
53static int gethostbyname_internal(const char *, int, struct hostent *, char *,
54    size_t, struct hostent **, int *, res_state);
55
56/* Host lookup order if nsswitch.conf is broken or nonexistent */
57static const ns_src default_src[] = {
58	{ NSSRC_FILES, NS_SUCCESS },
59	{ NSSRC_DNS, NS_SUCCESS },
60	{ 0 }
61};
62#ifdef NS_CACHING
63static int host_id_func(char *, size_t *, va_list, void *);
64static int host_marshal_func(char *, size_t *, void *, va_list, void *);
65static int host_unmarshal_func(char *, size_t, void *, va_list, void *);
66#endif
67
68NETDB_THREAD_ALLOC(hostent)
69NETDB_THREAD_ALLOC(hostent_data)
70NETDB_THREAD_ALLOC(hostdata)
71
72static void
73hostent_free(void *ptr)
74{
75	free(ptr);
76}
77
78static void
79hostent_data_free(void *ptr)
80{
81	struct hostent_data *hed = ptr;
82
83	if (hed == NULL)
84		return;
85	hed->stayopen = 0;
86	_endhosthtent(hed);
87	free(hed);
88}
89
90static void
91hostdata_free(void *ptr)
92{
93	free(ptr);
94}
95
96int
97__copy_hostent(struct hostent *he, struct hostent *hptr, char *buf,
98    size_t buflen)
99{
100	char *cp;
101	char **ptr;
102	int i, n;
103	int nptr, len;
104
105	/* Find out the amount of space required to store the answer. */
106	nptr = 2; /* NULL ptrs */
107	len = (char *)ALIGN(buf) - buf;
108	for (i = 0; he->h_addr_list[i]; i++, nptr++) {
109		len += he->h_length;
110	}
111	for (i = 0; he->h_aliases[i]; i++, nptr++) {
112		len += strlen(he->h_aliases[i]) + 1;
113	}
114	len += strlen(he->h_name) + 1;
115	len += nptr * sizeof(char*);
116
117	if (len > buflen) {
118		errno = ERANGE;
119		return (-1);
120	}
121
122	/* copy address size and type */
123	hptr->h_addrtype = he->h_addrtype;
124	n = hptr->h_length = he->h_length;
125
126	ptr = (char **)ALIGN(buf);
127	cp = (char *)ALIGN(buf) + nptr * sizeof(char *);
128
129	/* copy address list */
130	hptr->h_addr_list = ptr;
131	for (i = 0; he->h_addr_list[i]; i++ , ptr++) {
132		memcpy(cp, he->h_addr_list[i], n);
133		hptr->h_addr_list[i] = cp;
134		cp += n;
135	}
136	hptr->h_addr_list[i] = NULL;
137	ptr++;
138
139	/* copy official name */
140	n = strlen(he->h_name) + 1;
141	strcpy(cp, he->h_name);
142	hptr->h_name = cp;
143	cp += n;
144
145	/* copy aliases */
146	hptr->h_aliases = ptr;
147	for (i = 0 ; he->h_aliases[i]; i++) {
148		n = strlen(he->h_aliases[i]) + 1;
149		strcpy(cp, he->h_aliases[i]);
150		hptr->h_aliases[i] = cp;
151		cp += n;
152	}
153	hptr->h_aliases[i] = NULL;
154
155	return (0);
156}
157
158#ifdef NS_CACHING
159static int
160host_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
161{
162	res_state statp;
163	u_long res_options;
164
165	const int op_id = 1;
166	char *str;
167	void *addr;
168	socklen_t len;
169	int type;
170
171	size_t desired_size, size;
172	enum nss_lookup_type lookup_type;
173	char *p;
174	int res = NS_UNAVAIL;
175
176	statp = __res_state();
177	res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
178	    RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
179
180	lookup_type = (enum nss_lookup_type)cache_mdata;
181	switch (lookup_type) {
182	case nss_lt_name:
183		str = va_arg(ap, char *);
184		type = va_arg(ap, int);
185
186		size = strlen(str);
187		desired_size = sizeof(res_options) + sizeof(int) +
188		    sizeof(enum nss_lookup_type) + sizeof(int) + size + 1;
189
190		if (desired_size > *buffer_size) {
191			res = NS_RETURN;
192			goto fin;
193		}
194
195		p = buffer;
196
197		memcpy(p, &res_options, sizeof(res_options));
198		p += sizeof(res_options);
199
200		memcpy(p, &op_id, sizeof(int));
201		p += sizeof(int);
202
203		memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
204		p += sizeof(int);
205
206		memcpy(p, &type, sizeof(int));
207		p += sizeof(int);
208
209		memcpy(p, str, size + 1);
210
211		res = NS_SUCCESS;
212		break;
213	case nss_lt_id:
214		addr = va_arg(ap, void *);
215		len = va_arg(ap, socklen_t);
216		type = va_arg(ap, int);
217
218		desired_size = sizeof(res_options) + sizeof(int) +
219		    sizeof(enum nss_lookup_type) + sizeof(int) +
220		    sizeof(socklen_t) + len;
221
222		if (desired_size > *buffer_size) {
223			res = NS_RETURN;
224			goto fin;
225		}
226
227		p = buffer;
228		memcpy(p, &res_options, sizeof(res_options));
229		p += sizeof(res_options);
230
231		memcpy(p, &op_id, sizeof(int));
232		p += sizeof(int);
233
234		memcpy(p, &lookup_type, sizeof(enum nss_lookup_type));
235		p += sizeof(int);
236
237		memcpy(p, &type, sizeof(int));
238		p += sizeof(int);
239
240		memcpy(p, &len, sizeof(socklen_t));
241		p += sizeof(socklen_t);
242
243		memcpy(p, addr, len);
244
245		res = NS_SUCCESS;
246		break;
247	default:
248		/* should be unreachable */
249		return (NS_UNAVAIL);
250	}
251
252fin:
253	*buffer_size = desired_size;
254	return (res);
255}
256
257static int
258host_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
259    void *cache_mdata)
260{
261	char *str;
262	void *addr;
263	socklen_t len;
264	int type;
265	struct hostent *ht;
266
267	struct hostent new_ht;
268	size_t desired_size, aliases_size, addr_size, size;
269	char *p, **iter;
270
271	switch ((enum nss_lookup_type)cache_mdata) {
272	case nss_lt_name:
273		str = va_arg(ap, char *);
274		type = va_arg(ap, int);
275		break;
276	case nss_lt_id:
277		addr = va_arg(ap, void *);
278		len = va_arg(ap, socklen_t);
279		type = va_arg(ap, int);
280		break;
281	default:
282		/* should be unreachable */
283		return (NS_UNAVAIL);
284	}
285	ht = va_arg(ap, struct hostent *);
286
287	desired_size = _ALIGNBYTES + sizeof(struct hostent) + sizeof(char *);
288	if (ht->h_name != NULL)
289		desired_size += strlen(ht->h_name) + 1;
290
291	if (ht->h_aliases != NULL) {
292		aliases_size = 0;
293		for (iter = ht->h_aliases; *iter; ++iter) {
294			desired_size += strlen(*iter) + 1;
295			++aliases_size;
296		}
297
298		desired_size += _ALIGNBYTES +
299		    (aliases_size + 1) * sizeof(char *);
300	}
301
302	if (ht->h_addr_list != NULL) {
303		addr_size = 0;
304		for (iter = ht->h_addr_list; *iter; ++iter)
305			++addr_size;
306
307		desired_size += addr_size * _ALIGN(ht->h_length);
308		desired_size += _ALIGNBYTES + (addr_size + 1) * sizeof(char *);
309	}
310
311	if (desired_size > *buffer_size) {
312		/* this assignment is here for future use */
313		*buffer_size = desired_size;
314		return (NS_RETURN);
315	}
316
317	memcpy(&new_ht, ht, sizeof(struct hostent));
318	memset(buffer, 0, desired_size);
319
320	*buffer_size = desired_size;
321	p = buffer + sizeof(struct hostent) + sizeof(char *);
322	memcpy(buffer + sizeof(struct hostent), &p, sizeof(char *));
323	p = (char *)_ALIGN(p);
324
325	if (new_ht.h_name != NULL) {
326		size = strlen(new_ht.h_name);
327		memcpy(p, new_ht.h_name, size);
328		new_ht.h_name = p;
329		p += size + 1;
330	}
331
332	if (new_ht.h_aliases != NULL) {
333		p = (char *)_ALIGN(p);
334		memcpy(p, new_ht.h_aliases, sizeof(char *) * aliases_size);
335		new_ht.h_aliases = (char **)p;
336		p += sizeof(char *) * (aliases_size + 1);
337
338		for (iter = new_ht.h_aliases; *iter; ++iter) {
339			size = strlen(*iter);
340			memcpy(p, *iter, size);
341			*iter = p;
342			p += size + 1;
343		}
344	}
345
346	if (new_ht.h_addr_list != NULL) {
347		p = (char *)_ALIGN(p);
348		memcpy(p, new_ht.h_addr_list, sizeof(char *) * addr_size);
349		new_ht.h_addr_list = (char **)p;
350		p += sizeof(char *) * (addr_size + 1);
351
352		size = _ALIGN(new_ht.h_length);
353		for (iter = new_ht.h_addr_list; *iter; ++iter) {
354			memcpy(p, *iter, size);
355			*iter = p;
356			p += size + 1;
357		}
358	}
359	memcpy(buffer, &new_ht, sizeof(struct hostent));
360	return (NS_SUCCESS);
361}
362
363static int
364host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
365    void *cache_mdata)
366{
367	char *str;
368	void *addr;
369	socklen_t len;
370	int type;
371	struct hostent *ht;
372
373	char *p;
374	char **iter;
375	char *orig_buf;
376	size_t orig_buf_size;
377
378	switch ((enum nss_lookup_type)cache_mdata) {
379	case nss_lt_name:
380		str = va_arg(ap, char *);
381		type = va_arg(ap, int);
382		break;
383	case nss_lt_id:
384		addr = va_arg(ap, void *);
385		len = va_arg(ap, socklen_t);
386		type = va_arg(ap, int);
387		break;
388	default:
389		/* should be unreachable */
390		return (NS_UNAVAIL);
391	}
392
393	ht = va_arg(ap, struct hostent *);
394	orig_buf = va_arg(ap, char *);
395	orig_buf_size = va_arg(ap, size_t);
396
397	if (orig_buf_size <
398	    buffer_size - sizeof(struct hostent) - sizeof(char *)) {
399		errno = ERANGE;
400		return (NS_RETURN);
401	}
402
403	memcpy(ht, buffer, sizeof(struct hostent));
404	memcpy(&p, buffer + sizeof(struct hostent), sizeof(char *));
405
406	orig_buf = (char *)_ALIGN(orig_buf);
407	memcpy(orig_buf, buffer + sizeof(struct hostent) + sizeof(char *) +
408	    _ALIGN(p) - (size_t)p,
409	    buffer_size - sizeof(struct hostent) - sizeof(char *) -
410	    _ALIGN(p) + (size_t)p);
411	p = (char *)_ALIGN(p);
412
413	NS_APPLY_OFFSET(ht->h_name, orig_buf, p, char *);
414	if (ht->h_aliases != NULL) {
415		NS_APPLY_OFFSET(ht->h_aliases, orig_buf, p, char **);
416
417		for (iter = ht->h_aliases; *iter; ++iter)
418			NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
419	}
420
421	if (ht->h_addr_list != NULL) {
422		NS_APPLY_OFFSET(ht->h_addr_list, orig_buf, p, char **);
423
424		for (iter = ht->h_addr_list; *iter; ++iter)
425			NS_APPLY_OFFSET(*iter, orig_buf, p, char *);
426	}
427
428	*((struct hostent **)retval) = ht;
429	return (NS_SUCCESS);
430}
431#endif /* NS_CACHING */
432
433static int
434fakeaddr(const char *name, int af, struct hostent *hp, char *buf,
435    size_t buflen, res_state statp)
436{
437	struct hostent_data *hed;
438	struct hostent he;
439
440	if ((hed = __hostent_data_init()) == NULL) {
441		errno = ENOMEM;
442		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
443		return (-1);
444	}
445
446	if ((af != AF_INET ||
447	    inet_aton(name, (struct in_addr *)hed->host_addr) != 1) &&
448	    inet_pton(af, name, hed->host_addr) != 1) {
449		RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
450		return (-1);
451	}
452	strncpy(hed->hostbuf, name, MAXDNAME);
453	hed->hostbuf[MAXDNAME] = '\0';
454	if (af == AF_INET && (statp->options & RES_USE_INET6) != 0U) {
455		_map_v4v6_address((char *)hed->host_addr,
456		    (char *)hed->host_addr);
457		af = AF_INET6;
458	}
459	he.h_addrtype = af;
460	switch(af) {
461	case AF_INET:
462		he.h_length = NS_INADDRSZ;
463		break;
464	case AF_INET6:
465		he.h_length = NS_IN6ADDRSZ;
466		break;
467	default:
468		errno = EAFNOSUPPORT;
469		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
470		return (-1);
471	}
472	he.h_name = hed->hostbuf;
473	he.h_aliases = hed->host_aliases;
474	hed->host_aliases[0] = NULL;
475	hed->h_addr_ptrs[0] = (char *)hed->host_addr;
476	hed->h_addr_ptrs[1] = NULL;
477	he.h_addr_list = hed->h_addr_ptrs;
478	if (__copy_hostent(&he, hp, buf, buflen) != 0) {
479		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
480		return (-1);
481	}
482	RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
483	return (0);
484}
485
486int
487gethostbyname_r(const char *name, struct hostent *he, char *buffer,
488    size_t buflen, struct hostent **result, int *h_errnop)
489{
490	res_state statp;
491
492	statp = __res_state();
493	if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
494		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
495		return (-1);
496	}
497	if (statp->options & RES_USE_INET6) {
498		if (fakeaddr(name, AF_INET, he, buffer, buflen, statp) == 0) {
499			*result = he;
500			return (0);
501		}
502		if (gethostbyname_internal(name, AF_INET6, he, buffer, buflen,
503		    result, h_errnop, statp) == 0)
504			return (0);
505	}
506	return (gethostbyname_internal(name, AF_INET, he, buffer, buflen,
507	    result, h_errnop, statp));
508}
509
510int
511gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer,
512    size_t buflen, struct hostent **result, int *h_errnop)
513{
514	res_state statp;
515
516	statp = __res_state();
517	if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
518		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
519		return (-1);
520	}
521	return (gethostbyname_internal(name, af, he, buffer, buflen, result,
522	    h_errnop, statp));
523}
524
525int
526gethostbyname_internal(const char *name, int af, struct hostent *hp, char *buf,
527    size_t buflen, struct hostent **result, int *h_errnop, res_state statp)
528{
529	const char *cp;
530	int rval, ret_errno = 0;
531	char abuf[MAXDNAME];
532
533#ifdef NS_CACHING
534	static const nss_cache_info cache_info =
535		NS_COMMON_CACHE_INFO_INITIALIZER(
536		hosts, (void *)nss_lt_name,
537		host_id_func, host_marshal_func, host_unmarshal_func);
538#endif
539	static const ns_dtab dtab[] = {
540		NS_FILES_CB(_ht_gethostbyname, NULL)
541		{ NSSRC_DNS, _dns_gethostbyname, NULL },
542		NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
543#ifdef NS_CACHING
544		NS_CACHE_CB(&cache_info)
545#endif
546		{ 0 }
547	};
548
549	switch (af) {
550	case AF_INET:
551	case AF_INET6:
552		break;
553	default:
554		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
555		*h_errnop = statp->res_h_errno;
556		errno = EAFNOSUPPORT;
557		return (-1);
558	}
559
560	/*
561	 * if there aren't any dots, it could be a user-level alias.
562	 * this is also done in res_query() since we are not the only
563	 * function that looks up host names.
564	 */
565	if (!strchr(name, '.') &&
566	    (cp = res_hostalias(statp, name, abuf, sizeof abuf)))
567		name = cp;
568
569	if (fakeaddr(name, af, hp, buf, buflen, statp) == 0) {
570		*result = hp;
571		return (0);
572	}
573
574	rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
575	    "gethostbyname2_r", default_src, name, af, hp, buf, buflen,
576	    &ret_errno, h_errnop);
577
578	if (rval != NS_SUCCESS) {
579		errno = ret_errno;
580		return ((ret_errno != 0) ? ret_errno : -1);
581	}
582	return (0);
583}
584
585int
586gethostbyaddr_r(const void *addr, socklen_t len, int af, struct hostent *hp,
587    char *buf, size_t buflen, struct hostent **result, int *h_errnop)
588{
589	const u_char *uaddr = (const u_char *)addr;
590	const struct in6_addr *addr6;
591	socklen_t size;
592	int rval, ret_errno = 0;
593	res_state statp;
594
595#ifdef NS_CACHING
596	static const nss_cache_info cache_info =
597		NS_COMMON_CACHE_INFO_INITIALIZER(
598		hosts, (void *)nss_lt_id,
599		host_id_func, host_marshal_func, host_unmarshal_func);
600#endif
601	static const ns_dtab dtab[] = {
602		NS_FILES_CB(_ht_gethostbyaddr, NULL)
603		{ NSSRC_DNS, _dns_gethostbyaddr, NULL },
604		NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
605#ifdef NS_CACHING
606		NS_CACHE_CB(&cache_info)
607#endif
608		{ 0 }
609	};
610
611	statp = __res_state();
612	if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
613		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
614		*h_errnop = statp->res_h_errno;
615		return (-1);
616	}
617
618	if (af == AF_INET6 && len == NS_IN6ADDRSZ) {
619		addr6 = (const struct in6_addr *)addr;
620		if (IN6_IS_ADDR_LINKLOCAL(addr6)) {
621			RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
622			*h_errnop = statp->res_h_errno;
623			return (-1);
624		}
625		if (IN6_IS_ADDR_V4MAPPED(addr6) ||
626		    IN6_IS_ADDR_V4COMPAT(addr6)) {
627			/* Unmap. */
628			uaddr += NS_IN6ADDRSZ - NS_INADDRSZ;
629			af = AF_INET;
630			len = NS_INADDRSZ;
631		}
632	}
633	switch (af) {
634	case AF_INET:
635		size = NS_INADDRSZ;
636		break;
637	case AF_INET6:
638		size = NS_IN6ADDRSZ;
639		break;
640	default:
641		errno = EAFNOSUPPORT;
642		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
643		*h_errnop = statp->res_h_errno;
644		return (-1);
645	}
646	if (size != len) {
647		errno = EINVAL;
648		RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
649		*h_errnop = statp->res_h_errno;
650		return (-1);
651	}
652
653	rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS,
654	    "gethostbyaddr_r", default_src, uaddr, len, af, hp, buf, buflen,
655	    &ret_errno, h_errnop);
656
657	if (rval != NS_SUCCESS) {
658		errno = ret_errno;
659		return ((ret_errno != 0) ? ret_errno : -1);
660	}
661	return (0);
662}
663
664struct hostent *
665gethostbyname(const char *name)
666{
667	struct hostdata *hd;
668	struct hostent *rval;
669	int ret_h_errno;
670
671	if ((hd = __hostdata_init()) == NULL)
672		return (NULL);
673	if (gethostbyname_r(name, &hd->host, hd->data, sizeof(hd->data), &rval,
674	    &ret_h_errno) != 0)
675		return (NULL);
676	return (rval);
677}
678
679struct hostent *
680gethostbyname2(const char *name, int af)
681{
682	struct hostdata *hd;
683	struct hostent *rval;
684	int ret_h_errno;
685
686	if ((hd = __hostdata_init()) == NULL)
687		return (NULL);
688	if (gethostbyname2_r(name, af, &hd->host, hd->data, sizeof(hd->data),
689	    &rval, &ret_h_errno) != 0)
690		return (NULL);
691	return (rval);
692}
693
694struct hostent *
695gethostbyaddr(const void *addr, socklen_t len, int af)
696{
697	struct hostdata *hd;
698	struct hostent *rval;
699	int ret_h_errno;
700
701	if ((hd = __hostdata_init()) == NULL)
702		return (NULL);
703	if (gethostbyaddr_r(addr, len, af, &hd->host, hd->data,
704	    sizeof(hd->data), &rval, &ret_h_errno) != 0)
705		return (NULL);
706	return (rval);
707}
708
709void
710sethostent(int stayopen)
711{
712	struct hostent_data *hed;
713
714	if ((hed = __hostent_data_init()) == NULL)
715		return;
716	_sethosthtent(stayopen, hed);
717	_sethostdnsent(stayopen);
718}
719
720void
721endhostent(void)
722{
723	struct hostent_data *hed;
724
725	if ((hed = __hostent_data_init()) == NULL)
726		return;
727	_endhosthtent(hed);
728	_endhostdnsent();
729}
730