1 /* $OpenBSD: getnetent.c,v 1.11 2005/08/06 20:30:03 espie Exp $ */
2 /*
3 * Copyright (c) 1983, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
35 #include <netdb.h>
36 #include <stdio.h>
37 #include <string.h>
38
39 #define MAXALIASES 35
40
41 static FILE *netf;
42 static char line[BUFSIZ+1];
43 static struct netent net;
44 static char *net_aliases[MAXALIASES];
45 int _net_stayopen;
46
47 void
setnetent(int f)48 setnetent(int f)
49 {
50 if (netf == NULL)
51 netf = fopen(_PATH_NETWORKS, "r" );
52 else
53 rewind(netf);
54 _net_stayopen |= f;
55 }
56
57 void
endnetent(void)58 endnetent(void)
59 {
60 if (netf) {
61 fclose(netf);
62 netf = NULL;
63 }
64 _net_stayopen = 0;
65 }
66
67 struct netent *
getnetent(void)68 getnetent(void)
69 {
70 char *p, *cp, **q;
71 size_t len;
72
73 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
74 return (NULL);
75 again:
76 if ((p = fgetln(netf, &len)) == NULL)
77 return (NULL);
78 if (p[len-1] == '\n')
79 len--;
80 if (len >= sizeof(line) || len == 0)
81 goto again;
82 p = memcpy(line, p, len);
83 line[len] = '\0';
84 if (*p == '#')
85 goto again;
86 if ((cp = strchr(p, '#')) != NULL)
87 *cp = '\0';
88 net.n_name = p;
89 if (strlen(net.n_name) >= MAXHOSTNAMELEN-1)
90 net.n_name[MAXHOSTNAMELEN-1] = '\0';
91 cp = strpbrk(p, " \t");
92 if (cp == NULL)
93 goto again;
94 *cp++ = '\0';
95 while (*cp == ' ' || *cp == '\t')
96 cp++;
97 p = strpbrk(cp, " \t");
98 if (p != NULL)
99 *p++ = '\0';
100 net.n_net = inet_network(cp);
101 net.n_addrtype = AF_INET;
102 q = net.n_aliases = net_aliases;
103 if (p != NULL)
104 cp = p;
105 while (cp && *cp) {
106 if (*cp == ' ' || *cp == '\t') {
107 cp++;
108 continue;
109 }
110 if (q < &net_aliases[MAXALIASES - 1]) {
111 *q++ = cp;
112 if (strlen(cp) >= MAXHOSTNAMELEN-1)
113 cp[MAXHOSTNAMELEN-1] = '\0';
114 }
115 cp = strpbrk(cp, " \t");
116 if (cp != NULL)
117 *cp++ = '\0';
118 }
119 *q = NULL;
120 return (&net);
121 }
122