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