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
44 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
45 static 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
68 static FILE *netf;
69 static char line[BUFSIZ+1];
70 static struct netent net;
71 static char *net_aliases[MAXALIASES];
72 int _net_stayopen;
73
74 static void __setnetent(int);
75 static void __endnetent(void);
76
77 void
setnetent(int stayopen)78 setnetent(int stayopen)
79 {
80
81 sethostent(stayopen);
82 __setnetent(stayopen);
83 }
84
85 void
endnetent(void)86 endnetent(void)
87 {
88
89 endhostent();
90 __endnetent();
91 }
92
93 static void
__setnetent(int f)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
104 static void
__endnetent(void)105 __endnetent(void)
106 {
107
108 if (netf) {
109 fclose(netf);
110 netf = NULL;
111 }
112 _net_stayopen = 0;
113 }
114
115 struct netent *
getnetent(void)116 getnetent(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
129 again:
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