getnetent.c revision 1.21 
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 "namespace.h"
52#include <sys/types.h>
53#include <sys/socket.h>
54#include <netinet/in.h>
55#include <arpa/inet.h>
56#include <netdb.h>
57#include <stdio.h>
58#include <string.h>
59
60#ifdef __weak_alias
61__weak_alias(endnetent,_endnetent)
62__weak_alias(getnetent,_getnetent)
63__weak_alias(setnetent,_setnetent)
64#endif
65
66#define	MAXALIASES	35
67
68static FILE *netf;
69static char line[BUFSIZ+1];
70static struct netent net;
71static char *net_aliases[MAXALIASES];
72int _net_stayopen;
73
74static void __setnetent(int);
75static void __endnetent(void);
76
77void
78setnetent(int stayopen)
79{
80
81	sethostent(stayopen);
82	__setnetent(stayopen);
83}
84
85void
86endnetent(void)
87{
88
89	endhostent();
90	__endnetent();
91}
92
93static void
94__setnetent(int f)
95{
96
97	if (netf == NULL)
98		netf = fopen(_PATH_NETWORKS, "re");
99	else
100		rewind(netf);
101	_net_stayopen |= f;
102}
103
104static void
105__endnetent(void)
106{
107
108	if (netf) {
109		fclose(netf);
110		netf = NULL;
111	}
112	_net_stayopen = 0;
113}
114
115struct netent *
116getnetent(void)
117{
118	char *p;
119	register char *cp, **q;
120
121	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL)
122		return (NULL);
123#if (defined(__sparc__) && defined(_LP64)) ||		\
124    defined(__alpha__) ||				\
125    (defined(__i386__) && defined(_LP64)) ||		\
126    (defined(__sh__) && defined(_LP64))
127	net.__n_pad0 = 0;
128#endif
129again:
130	p = fgets(line, (int)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