Home | History | Annotate | Line # | Download | only in net
getnetent.c revision 1.8 
      1 /*	$NetBSD: getnetent.c,v 1.8 1997/04/13 10:30:37 mrg 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  * Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
     36  *    Dep. Matematica Universidade de Coimbra, Portugal, Europe
     37  *
     38  * Permission to use, copy, modify, and distribute this software for any
     39  * purpose with or without fee is hereby granted, provided that the above
     40  * copyright notice and this permission notice appear in all copies.
     41  *
     42  * from getnetent.c   1.1 (Coimbra) 93/06/02
     43  */
     44 
     45 #if defined(LIBC_SCCS) && !defined(lint)
     46 #if 0
     47 static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
     48 static char rcsid[] = "Id: getnetent.c,v 8.3 1996/08/05 08:31:35 vixie Exp";
     49 #else
     50 static char rcsid[] = "$NetBSD: getnetent.c,v 1.8 1997/04/13 10:30:37 mrg Exp $";
     51 #endif
     52 #endif /* LIBC_SCCS and not lint */
     53 
     54 #include <sys/types.h>
     55 #include <sys/socket.h>
     56 #include <netinet/in.h>
     57 #include <arpa/inet.h>
     58 #include <netdb.h>
     59 #include <stdio.h>
     60 #include <string.h>
     61 
     62 #define	MAXALIASES	35
     63 
     64 static FILE *netf;
     65 static char line[BUFSIZ+1];
     66 static struct netent net;
     67 static char *net_aliases[MAXALIASES];
     68 int _net_stayopen;
     69 
     70 void _setnetent __P((int));
     71 void _endnetent __P((void));
     72 
     73 void
     74 setnetent(stayopen)
     75 	int stayopen;
     76 {
     77 
     78 	sethostent(stayopen);
     79 	_setnetent(stayopen);
     80 }
     81 
     82 void
     83 endnetent()
     84 {
     85 
     86 	endhostent();
     87 	_endnetent();
     88 }
     89 
     90 void
     91 _setnetent(f)
     92 	int f;
     93 {
     94 
     95 	if (netf == NULL)
     96 		netf = fopen(_PATH_NETWORKS, "r" );
     97 	else
     98 		rewind(netf);
     99 	_net_stayopen |= f;
    100 }
    101 
    102 void
    103 _endnetent()
    104 {
    105 
    106 	if (netf) {
    107 		fclose(netf);
    108 		netf = NULL;
    109 	}
    110 	_net_stayopen = 0;
    111 }
    112 
    113 struct netent *
    114 getnetent()
    115 {
    116 	char *p;
    117 	register char *cp, **q;
    118 
    119 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
    120 		return (NULL);
    121 again:
    122 	p = fgets(line, BUFSIZ, netf);
    123 	if (p == NULL)
    124 		return (NULL);
    125 	if (*p == '#')
    126 		goto again;
    127 	cp = strpbrk(p, "#\n");
    128 	if (cp == NULL)
    129 		goto again;
    130 	*cp = '\0';
    131 	net.n_name = p;
    132 	cp = strpbrk(p, " \t");
    133 	if (cp == NULL)
    134 		goto again;
    135 	*cp++ = '\0';
    136 	while (*cp == ' ' || *cp == '\t')
    137 		cp++;
    138 	p = strpbrk(cp, " \t");
    139 	if (p != NULL)
    140 		*p++ = '\0';
    141 	net.n_net = inet_network(cp);
    142 	net.n_addrtype = AF_INET;
    143 	q = net.n_aliases = net_aliases;
    144 	if (p != NULL)  {
    145 		cp = p;
    146 		while (cp && *cp) {
    147 			if (*cp == ' ' || *cp == '\t') {
    148 				cp++;
    149 				continue;
    150 			}
    151 			if (q < &net_aliases[MAXALIASES - 1])
    152 				*q++ = cp;
    153 			cp = strpbrk(cp, " \t");
    154 			if (cp != NULL)
    155 				*cp++ = '\0';
    156 		}
    157 	}
    158 	*q = NULL;
    159 	return (&net);
    160 }
    161