getnetent.c revision 1.12 
1/*	$NetBSD: getnetent.c,v 1.12 1998/01/06 05:01:18 perry 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
36 *    Dep. Matematica Universidade de Coimbra, Portugal, Europe
37 *
38 * Permission to use, copy, modify, and distribute this software for any
39 * purpose with or without fee is hereby granted, provided that the above
40 * copyright notice and this permission notice appear in all copies.
41 *
42 * from getnetent.c   1.1 (Coimbra) 93/06/02
43 */
44
45#include <sys/cdefs.h>
46#if defined(LIBC_SCCS) && !defined(lint)
47#if 0
48static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
49static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp ";
50#else
51__RCSID("$NetBSD: getnetent.c,v 1.12 1998/01/06 05:01:18 perry Exp $");
52#endif
53#endif /* LIBC_SCCS and not lint */
54
55#include "namespace.h"
56#include <sys/types.h>
57#include <sys/socket.h>
58#include <netinet/in.h>
59#include <arpa/inet.h>
60#include <netdb.h>
61#include <stdio.h>
62#include <string.h>
63
64#ifdef __weak_alias
65__weak_alias(endnetent,_endnetent);
66__weak_alias(getnetent,_getnetent);
67__weak_alias(setnetent,_setnetent);
68#endif
69
70#define	MAXALIASES	35
71
72static FILE *netf;
73static char line[BUFSIZ+1];
74static struct netent net;
75static char *net_aliases[MAXALIASES];
76int _net_stayopen;
77
78static void __setnetent __P((int));
79static void __endnetent __P((void));
80
81void
82setnetent(stayopen)
83	int stayopen;
84{
85
86	sethostent(stayopen);
87	__setnetent(stayopen);
88}
89
90void
91endnetent()
92{
93
94	endhostent();
95	__endnetent();
96}
97
98static void
99__setnetent(f)
100	int f;
101{
102
103	if (netf == NULL)
104		netf = fopen(_PATH_NETWORKS, "r" );
105	else
106		rewind(netf);
107	_net_stayopen |= f;
108}
109
110static void
111__endnetent()
112{
113
114	if (netf) {
115		fclose(netf);
116		netf = NULL;
117	}
118	_net_stayopen = 0;
119}
120
121struct netent *
122getnetent()
123{
124	char *p;
125	register char *cp, **q;
126
127	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
128		return (NULL);
129again:
130	p = fgets(line, sizeof line, netf);
131	if (p == NULL)
132		return (NULL);
133	if (*p == '#')
134		goto again;
135	cp = strpbrk(p, "#\n");
136	if (cp == NULL)
137		goto again;
138	*cp = '\0';
139	net.n_name = p;
140	cp = strpbrk(p, " \t");
141	if (cp == NULL)
142		goto again;
143	*cp++ = '\0';
144	while (*cp == ' ' || *cp == '\t')
145		cp++;
146	p = strpbrk(cp, " \t");
147	if (p != NULL)
148		*p++ = '\0';
149	net.n_net = inet_network(cp);
150	net.n_addrtype = AF_INET;
151	q = net.n_aliases = net_aliases;
152	if (p != NULL)  {
153		cp = p;
154		while (cp && *cp) {
155			if (*cp == ' ' || *cp == '\t') {
156				cp++;
157				continue;
158			}
159			if (q < &net_aliases[MAXALIASES - 1])
160				*q++ = cp;
161			cp = strpbrk(cp, " \t");
162			if (cp != NULL)
163				*cp++ = '\0';
164		}
165	}
166	*q = NULL;
167	return (&net);
168}
169