gethostnamadr.c revision 92986 
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: head/lib/libc/net/gethostnamadr.c 92986 2002-03-22 21:53:29Z obrien $");
28
29#include <sys/param.h>
30#include <sys/socket.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <netdb.h>
34#include <stdio.h>
35#include <ctype.h>
36#include <string.h>
37#include <stdarg.h>
38#include <nsswitch.h>
39#include <arpa/nameser.h>		/* XXX hack for _res */
40#include <resolv.h>			/* XXX hack for _res */
41
42extern int _ht_gethostbyname(void *, void *, va_list);
43extern int _dns_gethostbyname(void *, void *, va_list);
44extern int _nis_gethostbyname(void *, void *, va_list);
45extern int _ht_gethostbyaddr(void *, void *, va_list);
46extern int _dns_gethostbyaddr(void *, void *, va_list);
47extern int _nis_gethostbyaddr(void *, void *, va_list);
48
49/* Host lookup order if nsswitch.conf is broken or nonexistant */
50static const ns_src default_src[] = {
51	{ NSSRC_FILES, NS_SUCCESS },
52	{ NSSRC_DNS, NS_SUCCESS },
53	{ 0 }
54};
55
56struct hostent *
57gethostbyname(const char *name)
58{
59	struct hostent *hp;
60
61	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
62		h_errno = NETDB_INTERNAL;
63		return (NULL);
64	}
65	if (_res.options & RES_USE_INET6) {		/* XXX */
66		hp = gethostbyname2(name, AF_INET6);	/* XXX */
67		if (hp)					/* XXX */
68			return (hp);			/* XXX */
69	}						/* XXX */
70	return (gethostbyname2(name, AF_INET));
71}
72
73struct hostent *
74gethostbyname2(const char *name, int type)
75{
76	struct hostent *hp = 0;
77	int rval;
78
79	static const ns_dtab dtab[] = {
80		NS_FILES_CB(_ht_gethostbyname, NULL)
81		{ NSSRC_DNS, _dns_gethostbyname, NULL },
82		NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */
83		{ 0 }
84	};
85
86	rval = nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyname",
87			  default_src, name, type);
88
89	if (rval != NS_SUCCESS)
90		return NULL;
91	else
92		return hp;
93}
94
95struct hostent *
96gethostbyaddr(const char *addr, int len, int type)
97{
98	struct hostent *hp = 0;
99	int rval;
100
101	static const ns_dtab dtab[] = {
102		NS_FILES_CB(_ht_gethostbyaddr, NULL)
103		{ NSSRC_DNS, _dns_gethostbyaddr, NULL },
104		NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */
105		{ 0 }
106	};
107
108	rval = nsdispatch((void *)&hp, dtab, NSDB_HOSTS, "gethostbyaddr",
109			  default_src, addr, len, type);
110
111	if (rval != NS_SUCCESS)
112		return NULL;
113	else
114		return hp;
115}
116
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
136void
137sethostent(stayopen)
138	int stayopen;
139{
140	_sethosthtent(stayopen);
141	_sethostdnsent(stayopen);
142}
143
144void
145endhostent()
146{
147	_endhosthtent();
148	_endhostdnsent();
149}
150