1/*	$NetBSD: getnetent.c,v 1.21 2012/03/20 17:44:18 matt Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
32 *    Dep. Matematica Universidade de Coimbra, Portugal, Europe
33 *
34 * Permission to use, copy, modify, and distribute this software for any
35 * purpose with or without fee is hereby granted, provided that the above
36 * copyright notice and this permission notice appear in all copies.
37 *
38 * from getnetent.c   1.1 (Coimbra) 93/06/02
39 */
40
41#include <sys/cdefs.h>
42#if defined(LIBC_SCCS) && !defined(lint)
43#if 0
44static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
45static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp ";
46#else
47__RCSID("$NetBSD: getnetent.c,v 1.21 2012/03/20 17:44:18 matt Exp $");
48#endif
49#endif /* LIBC_SCCS and not lint */
50
51#include <sys/types.h>
52#include <sys/socket.h>
53#include <netinet/in.h>
54#include <arpa/inet.h>
55#include <netdb.h>
56#include <stdio.h>
57#include <string.h>
58
59#ifdef __weak_alias
60__weak_alias(endnetent,_endnetent)
61__weak_alias(getnetent,_getnetent)
62__weak_alias(setnetent,_setnetent)
63#endif
64
65#ifndef _PATH_NETWORKS
66#define	_PATH_NETWORKS	"/etc/networks"
67#endif
68
69#define	MAXALIASES	35
70
71static FILE *netf;
72static char line[BUFSIZ+1];
73static struct netent net;
74static char *net_aliases[MAXALIASES];
75int _net_stayopen;
76
77static void __setnetent(int);
78static void __endnetent(void);
79
80void
81setnetent(int stayopen)
82{
83
84	sethostent(stayopen);
85	__setnetent(stayopen);
86}
87
88void
89endnetent(void)
90{
91
92	endhostent();
93	__endnetent();
94}
95
96static void
97__setnetent(int f)
98{
99
100	if (netf == NULL)
101		netf = fopen(_PATH_NETWORKS, "re");
102	else
103		rewind(netf);
104	_net_stayopen |= f;
105}
106
107static void
108__endnetent(void)
109{
110
111	if (netf) {
112		fclose(netf);
113		netf = NULL;
114	}
115	_net_stayopen = 0;
116}
117
118struct netent *
119getnetent(void)
120{
121	char *p;
122	register char *cp, **q;
123
124	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL)
125		return (NULL);
126#if (defined(__sparc__) && defined(_LP64)) ||		\
127    defined(__alpha__) ||				\
128    (defined(__i386__) && defined(_LP64)) ||		\
129    (defined(__sh__) && defined(_LP64))
130	net.__n_pad0 = 0;
131#endif
132again:
133	p = fgets(line, (int)sizeof line, netf);
134	if (p == NULL)
135		return (NULL);
136	if (*p == '#')
137		goto again;
138	cp = strpbrk(p, "#\n");
139	if (cp == NULL)
140		goto again;
141	*cp = '\0';
142	net.n_name = p;
143	cp = strpbrk(p, " \t");
144	if (cp == NULL)
145		goto again;
146	*cp++ = '\0';
147	while (*cp == ' ' || *cp == '\t')
148		cp++;
149	p = strpbrk(cp, " \t");
150	if (p != NULL)
151		*p++ = '\0';
152	net.n_net = inet_network(cp);
153	net.n_addrtype = AF_INET;
154	q = net.n_aliases = net_aliases;
155	if (p != NULL) {
156		cp = p;
157		while (cp && *cp) {
158			if (*cp == ' ' || *cp == '\t') {
159				cp++;
160				continue;
161			}
162			if (q < &net_aliases[MAXALIASES - 1])
163				*q++ = cp;
164			cp = strpbrk(cp, " \t");
165			if (cp != NULL)
166				*cp++ = '\0';
167		}
168	}
169	*q = NULL;
170	return (&net);
171}
172