1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. 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)
35 static char sccsid[] = "@(#)getprotoent.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <netdb.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44
45 #define MAXALIASES 35
46
47 static FILE *protof = NULL;
48 static char line[BUFSIZ+1];
49 static struct protoent proto;
50 static char *proto_aliases[MAXALIASES];
51 int _proto_stayopen;
52
53 void
setprotoent(int f)54 setprotoent(int f)
55 {
56 if (protof == NULL)
57 protof = fopen(_PATH_PROTOCOLS, "r" );
58 else
59 rewind(protof);
60 _proto_stayopen |= f;
61 }
62
63 void
endprotoent()64 endprotoent()
65 {
66 if (protof) {
67 fclose(protof);
68 protof = NULL;
69 }
70 _proto_stayopen = 0;
71 }
72
73 struct protoent *
getprotoent()74 getprotoent()
75 {
76 char *p;
77 register char *cp, **q;
78
79 if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
80 return (NULL);
81 again:
82 if ((p = fgets(line, BUFSIZ, protof)) == NULL)
83 return (NULL);
84 if (*p == '#')
85 goto again;
86 cp = strpbrk(p, "#\n");
87 if (cp == NULL)
88 goto again;
89 *cp = '\0';
90 proto.p_name = p;
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 proto.p_proto = atoi(cp);
101 q = proto.p_aliases = proto_aliases;
102 if (p != NULL) {
103 cp = p;
104 while (cp && *cp) {
105 if (*cp == ' ' || *cp == '\t') {
106 cp++;
107 continue;
108 }
109 if (q < &proto_aliases[MAXALIASES - 1])
110 *q++ = cp;
111 cp = strpbrk(cp, " \t");
112 if (cp != NULL)
113 *cp++ = '\0';
114 }
115 }
116 *q = NULL;
117 return (&proto);
118 }
119