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getprotoent.c revision 1.1 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * 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	5.8 (Berkeley) 2/24/91";
     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
     54 setprotoent(f)
     55 	int f;
     56 {
     57 	if (protof == NULL)
     58 		protof = fopen(_PATH_PROTOCOLS, "r" );
     59 	else
     60 		rewind(protof);
     61 	_proto_stayopen |= f;
     62 }
     63 
     64 void
     65 endprotoent()
     66 {
     67 	if (protof) {
     68 		fclose(protof);
     69 		protof = NULL;
     70 	}
     71 	_proto_stayopen = 0;
     72 }
     73 
     74 struct protoent *
     75 getprotoent()
     76 {
     77 	char *p;
     78 	register char *cp, **q;
     79 
     80 	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
     81 		return (NULL);
     82 again:
     83 	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
     84 		return (NULL);
     85 	if (*p == '#')
     86 		goto again;
     87 	cp = strpbrk(p, "#\n");
     88 	if (cp == NULL)
     89 		goto again;
     90 	*cp = '\0';
     91 	proto.p_name = p;
     92 	cp = strpbrk(p, " \t");
     93 	if (cp == NULL)
     94 		goto again;
     95 	*cp++ = '\0';
     96 	while (*cp == ' ' || *cp == '\t')
     97 		cp++;
     98 	p = strpbrk(cp, " \t");
     99 	if (p != NULL)
    100 		*p++ = '\0';
    101 	proto.p_proto = atoi(cp);
    102 	q = proto.p_aliases = proto_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 < &proto_aliases[MAXALIASES - 1])
    111 				*q++ = cp;
    112 			cp = strpbrk(cp, " \t");
    113 			if (cp != NULL)
    114 				*cp++ = '\0';
    115 		}
    116 	}
    117 	*q = NULL;
    118 	return (&proto);
    119 }
    120