getnetent.c revision 1.2 
1/*
2 * Copyright (c) 1983 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35/*static char sccsid[] = "from: @(#)getnetent.c	5.8 (Berkeley) 2/24/91";*/
36static char rcsid[] = "$Id: getnetent.c,v 1.2 1993/08/01 18:39:47 mycroft Exp $";
37#endif /* LIBC_SCCS and not lint */
38
39#include <sys/types.h>
40#include <sys/socket.h>
41#include <netinet/in.h>
42#include <arpa/inet.h>
43#include <netdb.h>
44#include <stdio.h>
45#include <string.h>
46
47#define	MAXALIASES	35
48
49static FILE *netf;
50static char line[BUFSIZ+1];
51static struct netent net;
52static char *net_aliases[MAXALIASES];
53int _net_stayopen;
54
55void
56setnetent(f)
57	int f;
58{
59	if (netf == NULL)
60		netf = fopen(_PATH_NETWORKS, "r" );
61	else
62		rewind(netf);
63	_net_stayopen |= f;
64}
65
66void
67endnetent()
68{
69	if (netf) {
70		fclose(netf);
71		netf = NULL;
72	}
73	_net_stayopen = 0;
74}
75
76struct netent *
77getnetent()
78{
79	char *p;
80	register char *cp, **q;
81
82	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
83		return (NULL);
84again:
85	p = fgets(line, BUFSIZ, netf);
86	if (p == NULL)
87		return (NULL);
88	if (*p == '#')
89		goto again;
90	cp = strpbrk(p, "#\n");
91	if (cp == NULL)
92		goto again;
93	*cp = '\0';
94	net.n_name = p;
95	cp = strpbrk(p, " \t");
96	if (cp == NULL)
97		goto again;
98	*cp++ = '\0';
99	while (*cp == ' ' || *cp == '\t')
100		cp++;
101	p = strpbrk(cp, " \t");
102	if (p != NULL)
103		*p++ = '\0';
104	net.n_net = inet_network(cp);
105	net.n_addrtype = AF_INET;
106	q = net.n_aliases = net_aliases;
107	if (p != NULL)
108		cp = p;
109	while (cp && *cp) {
110		if (*cp == ' ' || *cp == '\t') {
111			cp++;
112			continue;
113		}
114		if (q < &net_aliases[MAXALIASES - 1])
115			*q++ = cp;
116		cp = strpbrk(cp, " \t");
117		if (cp != NULL)
118			*cp++ = '\0';
119	}
120	*q = NULL;
121	return (&net);
122}
123