getnetent.c revision 1.1 
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)
35static char sccsid[] = "@(#)getnetent.c	5.8 (Berkeley) 2/24/91";
36#endif /* LIBC_SCCS and not lint */
37
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <netinet/in.h>
41#include <arpa/inet.h>
42#include <netdb.h>
43#include <stdio.h>
44#include <string.h>
45
46#define	MAXALIASES	35
47
48static FILE *netf;
49static char line[BUFSIZ+1];
50static struct netent net;
51static char *net_aliases[MAXALIASES];
52int _net_stayopen;
53
54void
55setnetent(f)
56	int f;
57{
58	if (netf == NULL)
59		netf = fopen(_PATH_NETWORKS, "r" );
60	else
61		rewind(netf);
62	_net_stayopen |= f;
63}
64
65void
66endnetent()
67{
68	if (netf) {
69		fclose(netf);
70		netf = NULL;
71	}
72	_net_stayopen = 0;
73}
74
75struct netent *
76getnetent()
77{
78	char *p;
79	register char *cp, **q;
80
81	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
82		return (NULL);
83again:
84	p = fgets(line, BUFSIZ, netf);
85	if (p == NULL)
86		return (NULL);
87	if (*p == '#')
88		goto again;
89	cp = strpbrk(p, "#\n");
90	if (cp == NULL)
91		goto again;
92	*cp = '\0';
93	net.n_name = p;
94	cp = strpbrk(p, " \t");
95	if (cp == NULL)
96		goto again;
97	*cp++ = '\0';
98	while (*cp == ' ' || *cp == '\t')
99		cp++;
100	p = strpbrk(cp, " \t");
101	if (p != NULL)
102		*p++ = '\0';
103	net.n_net = inet_network(cp);
104	net.n_addrtype = AF_INET;
105	q = net.n_aliases = net_aliases;
106	if (p != NULL)
107		cp = p;
108	while (cp && *cp) {
109		if (*cp == ' ' || *cp == '\t') {
110			cp++;
111			continue;
112		}
113		if (q < &net_aliases[MAXALIASES - 1])
114			*q++ = cp;
115		cp = strpbrk(cp, " \t");
116		if (cp != NULL)
117			*cp++ = '\0';
118	}
119	*q = NULL;
120	return (&net);
121}
122