gethostnamadr.c revision 65532 
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#if defined(LIBC_SCCS) && !defined(lint)
27static char sccsid[] = "@(#)$FreeBSD: head/lib/libc/net/gethostnamadr.c 65532 2000-09-06 18:16:48Z nectar $";
28static char rcsid[] = "$FreeBSD: head/lib/libc/net/gethostnamadr.c 65532 2000-09-06 18:16:48Z nectar $";
29#endif /* LIBC_SCCS and not lint */
30
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 <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
45extern int _ht_gethostbyname(void *, void *, va_list);
46extern int _dns_gethostbyname(void *, void *, va_list);
47extern int _nis_gethostbyname(void *, void *, va_list);
48extern int _ht_gethostbyaddr(void *, void *, va_list);
49extern int _dns_gethostbyaddr(void *, void *, va_list);
50extern int _nis_gethostbyaddr(void *, void *, va_list);
51
52/* Host lookup order if nsswitch.conf is broken or nonexistant */
53static const ns_src default_src[] = {
54	{ NSSRC_FILES, NS_SUCCESS },
55	{ NSSRC_DNS, NS_SUCCESS },
56	{ 0 }
57};
58
59struct hostent *
60gethostbyname(const char *name)
61{
62	struct hostent *hp;
63
64	if (_res.options & RES_USE_INET6) {		/* XXX */
65		hp = gethostbyname2(name, AF_INET6);	/* XXX */
66		if (hp)					/* XXX */
67			return (hp);			/* XXX */
68	}						/* XXX */
69	return (gethostbyname2(name, AF_INET));
70}
71
72struct hostent *
73gethostbyname2(const char *name, int type)
74{
75	struct hostent *hp = 0;
76	int rval;
77
78	static const ns_dtab dtab[] = {
79		NS_FILES_CB(_ht_gethostbyname, NULL)
80		{ NSSRC_DNS, _dns_gethostbyname, NULL },
81		NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
82		{ 0 }
83	};
84
85	rval = nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyname",
86			  default_src, name, type);
87
88	if (rval != NS_SUCCESS)
89		return NULL;
90	else
91		return hp;
92}
93
94struct hostent *
95gethostbyaddr(const char *addr, int len, int type)
96{
97	struct hostent *hp = 0;
98	int rval;
99
100	static const ns_dtab dtab[] = {
101		NS_FILES_CB(_ht_gethostbyaddr, NULL)
102		{ NSSRC_DNS, _dns_gethostbyaddr, NULL },
103		NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
104		{ 0 }
105	};
106
107	rval = nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyaddr",
108			  default_src, addr, len, type);
109
110	if (rval != NS_SUCCESS)
111		return NULL;
112	else
113		return hp;
114}
115
116#ifdef _THREAD_SAFE
117struct hostent_data;
118
119/*
120 * Temporary function (not thread safe)
121 */
122int gethostbyaddr_r(const char *addr, int len, int type,
123	struct hostent *result, struct hostent_data *buffer)
124{
125	struct hostent *hp;
126	int ret;
127	if ((hp = gethostbyaddr(addr, len, type)) == NULL) {
128		ret = -1;
129	} else {
130		memcpy(result, hp, sizeof(struct hostent));
131		ret = 0;
132	}
133	return(ret);
134}
135#endif
136
137void
138sethostent(stayopen)
139	int stayopen;
140{
141	_sethosthtent(stayopen);
142	_sethostdnsent(stayopen);
143}
144
145void
146endhostent()
147{
148	_endhosthtent();
149	_endhostdnsent();
150}
151