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getnetent.c revision 1.5 
      1 /*	$NetBSD: getnetent.c,v 1.5 1996/01/14 05:02:41 ghudson Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getnetent.c,v 1.5 1996/01/14 05:02:41 ghudson Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/socket.h>
     46 #include <netinet/in.h>
     47 #include <arpa/inet.h>
     48 #include <netdb.h>
     49 #include <stdio.h>
     50 #include <string.h>
     51 
     52 #define	MAXALIASES	35
     53 
     54 static FILE *netf;
     55 static char line[BUFSIZ+1];
     56 static struct netent net;
     57 static char *net_aliases[MAXALIASES];
     58 int _net_stayopen;
     59 
     60 void
     61 setnetent(f)
     62 	int f;
     63 {
     64 	if (netf == NULL)
     65 		netf = fopen(_PATH_NETWORKS, "r" );
     66 	else
     67 		rewind(netf);
     68 	_net_stayopen |= f;
     69 }
     70 
     71 void
     72 endnetent()
     73 {
     74 	if (netf) {
     75 		fclose(netf);
     76 		netf = NULL;
     77 	}
     78 	_net_stayopen = 0;
     79 }
     80 
     81 struct netent *
     82 getnetent()
     83 {
     84 	char *p;
     85 	register char *cp, **q;
     86 
     87 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
     88 		return (NULL);
     89 again:
     90 	p = fgets(line, BUFSIZ, netf);
     91 	if (p == NULL)
     92 		return (NULL);
     93 	if (*p == '#')
     94 		goto again;
     95 	cp = strpbrk(p, "#\n");
     96 	if (cp == NULL)
     97 		goto again;
     98 	*cp = '\0';
     99 	net.n_name = p;
    100 	cp = strpbrk(p, " \t");
    101 	if (cp == NULL)
    102 		goto again;
    103 	*cp++ = '\0';
    104 	while (*cp == ' ' || *cp == '\t')
    105 		cp++;
    106 	p = strpbrk(cp, " \t");
    107 	if (p != NULL)
    108 		*p++ = '\0';
    109 	net.n_net = inet_network(cp);
    110 	net.n_addrtype = AF_INET;
    111 	q = net.n_aliases = net_aliases;
    112 	if (p != NULL) {
    113 		cp = p;
    114 		while (cp && *cp) {
    115 			if (*cp == ' ' || *cp == '\t') {
    116 				cp++;
    117 				continue;
    118 			}
    119 			if (q < &net_aliases[MAXALIASES - 1])
    120 				*q++ = cp;
    121 			cp = strpbrk(cp, " \t");
    122 			if (cp != NULL)
    123 				*cp++ = '\0';
    124 		}
    125 	}
    126 	*q = NULL;
    127 	return (&net);
    128 }
    129