getnetent.c revision 1.5 
1/*	$NetBSD: getnetent.c,v 1.5 1996/01/14 05:02:41 ghudson 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
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
39#else
40static char rcsid[] = "$NetBSD: getnetent.c,v 1.5 1996/01/14 05:02:41 ghudson Exp $";
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include <sys/types.h>
45#include <sys/socket.h>
46#include <netinet/in.h>
47#include <arpa/inet.h>
48#include <netdb.h>
49#include <stdio.h>
50#include <string.h>
51
52#define	MAXALIASES	35
53
54static FILE *netf;
55static char line[BUFSIZ+1];
56static struct netent net;
57static char *net_aliases[MAXALIASES];
58int _net_stayopen;
59
60void
61setnetent(f)
62	int f;
63{
64	if (netf == NULL)
65		netf = fopen(_PATH_NETWORKS, "r" );
66	else
67		rewind(netf);
68	_net_stayopen |= f;
69}
70
71void
72endnetent()
73{
74	if (netf) {
75		fclose(netf);
76		netf = NULL;
77	}
78	_net_stayopen = 0;
79}
80
81struct netent *
82getnetent()
83{
84	char *p;
85	register char *cp, **q;
86
87	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
88		return (NULL);
89again:
90	p = fgets(line, BUFSIZ, netf);
91	if (p == NULL)
92		return (NULL);
93	if (*p == '#')
94		goto again;
95	cp = strpbrk(p, "#\n");
96	if (cp == NULL)
97		goto again;
98	*cp = '\0';
99	net.n_name = p;
100	cp = strpbrk(p, " \t");
101	if (cp == NULL)
102		goto again;
103	*cp++ = '\0';
104	while (*cp == ' ' || *cp == '\t')
105		cp++;
106	p = strpbrk(cp, " \t");
107	if (p != NULL)
108		*p++ = '\0';
109	net.n_net = inet_network(cp);
110	net.n_addrtype = AF_INET;
111	q = net.n_aliases = net_aliases;
112	if (p != NULL) {
113		cp = p;
114		while (cp && *cp) {
115			if (*cp == ' ' || *cp == '\t') {
116				cp++;
117				continue;
118			}
119			if (q < &net_aliases[MAXALIASES - 1])
120				*q++ = cp;
121			cp = strpbrk(cp, " \t");
122			if (cp != NULL)
123				*cp++ = '\0';
124		}
125	}
126	*q = NULL;
127	return (&net);
128}
129