1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #if defined(LIBC_SCCS) && !defined(lint)
9 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 06/04/93";
10 #endif /* LIBC_SCCS and not lint */
11
12 #include <sys/types.h>
13 #include <sys/socket.h>
14 #include <netinet/in.h>
15 #include <arpa/inet.h>
16 #include <netdb.h>
17 #include <stdio.h>
18 #include <string.h>
19
20 #define MAXALIASES 35
21
22 static FILE *netf;
23 static char line[BUFSIZ+1];
24 static struct netent net;
25 static char *net_aliases[MAXALIASES];
26 int _net_stayopen;
27
28 void
setnetent(f)29 setnetent(f)
30 int f;
31 {
32 if (netf == NULL)
33 netf = fopen(_PATH_NETWORKS, "r" );
34 else
35 rewind(netf);
36 _net_stayopen |= f;
37 }
38
39 void
endnetent()40 endnetent()
41 {
42 if (netf) {
43 fclose(netf);
44 netf = NULL;
45 }
46 _net_stayopen = 0;
47 }
48
49 struct netent *
getnetent()50 getnetent()
51 {
52 char *p;
53 register char *cp, **q;
54
55 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
56 return (NULL);
57 again:
58 p = fgets(line, BUFSIZ, netf);
59 if (p == NULL)
60 return (NULL);
61 if (*p == '#')
62 goto again;
63 cp = strpbrk(p, "#\n");
64 if (cp == NULL)
65 goto again;
66 *cp = '\0';
67 net.n_name = p;
68 cp = strpbrk(p, " \t");
69 if (cp == NULL)
70 goto again;
71 *cp++ = '\0';
72 while (*cp == ' ' || *cp == '\t')
73 cp++;
74 p = strpbrk(cp, " \t");
75 if (p != NULL)
76 *p++ = '\0';
77 net.n_net = inet_network(cp);
78 net.n_addrtype = AF_INET;
79 q = net.n_aliases = net_aliases;
80 if (p != NULL)
81 cp = p;
82 while (cp && *cp) {
83 if (*cp == ' ' || *cp == '\t') {
84 cp++;
85 continue;
86 }
87 if (q < &net_aliases[MAXALIASES - 1])
88 *q++ = cp;
89 cp = strpbrk(cp, " \t");
90 if (cp != NULL)
91 *cp++ = '\0';
92 }
93 *q = NULL;
94 return (&net);
95 }
96