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getnetent.c revision 1.9 
      1 /*	$NetBSD: getnetent.c,v 1.9 1997/07/13 19:57:36 christos 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 #include <sys/cdefs.h>
     46 #if defined(LIBC_SCCS) && !defined(lint)
     47 #if 0
     48 static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
     49 static char rcsid[] = "Id: getnetent.c,v 8.3 1996/08/05 08:31:35 vixie Exp";
     50 #else
     51 __RCSID("$NetBSD: getnetent.c,v 1.9 1997/07/13 19:57:36 christos Exp $");
     52 #endif
     53 #endif /* LIBC_SCCS and not lint */
     54 
     55 #include <sys/types.h>
     56 #include <sys/socket.h>
     57 #include <netinet/in.h>
     58 #include <arpa/inet.h>
     59 #include <netdb.h>
     60 #include <stdio.h>
     61 #include <string.h>
     62 
     63 #define	MAXALIASES	35
     64 
     65 static FILE *netf;
     66 static char line[BUFSIZ+1];
     67 static struct netent net;
     68 static char *net_aliases[MAXALIASES];
     69 int _net_stayopen;
     70 
     71 void _setnetent __P((int));
     72 void _endnetent __P((void));
     73 
     74 void
     75 setnetent(stayopen)
     76 	int stayopen;
     77 {
     78 
     79 	sethostent(stayopen);
     80 	_setnetent(stayopen);
     81 }
     82 
     83 void
     84 endnetent()
     85 {
     86 
     87 	endhostent();
     88 	_endnetent();
     89 }
     90 
     91 void
     92 _setnetent(f)
     93 	int f;
     94 {
     95 
     96 	if (netf == NULL)
     97 		netf = fopen(_PATH_NETWORKS, "r" );
     98 	else
     99 		rewind(netf);
    100 	_net_stayopen |= f;
    101 }
    102 
    103 void
    104 _endnetent()
    105 {
    106 
    107 	if (netf) {
    108 		fclose(netf);
    109 		netf = NULL;
    110 	}
    111 	_net_stayopen = 0;
    112 }
    113 
    114 struct netent *
    115 getnetent()
    116 {
    117 	char *p;
    118 	register char *cp, **q;
    119 
    120 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
    121 		return (NULL);
    122 again:
    123 	p = fgets(line, BUFSIZ, netf);
    124 	if (p == NULL)
    125 		return (NULL);
    126 	if (*p == '#')
    127 		goto again;
    128 	cp = strpbrk(p, "#\n");
    129 	if (cp == NULL)
    130 		goto again;
    131 	*cp = '\0';
    132 	net.n_name = p;
    133 	cp = strpbrk(p, " \t");
    134 	if (cp == NULL)
    135 		goto again;
    136 	*cp++ = '\0';
    137 	while (*cp == ' ' || *cp == '\t')
    138 		cp++;
    139 	p = strpbrk(cp, " \t");
    140 	if (p != NULL)
    141 		*p++ = '\0';
    142 	net.n_net = inet_network(cp);
    143 	net.n_addrtype = AF_INET;
    144 	q = net.n_aliases = net_aliases;
    145 	if (p != NULL)  {
    146 		cp = p;
    147 		while (cp && *cp) {
    148 			if (*cp == ' ' || *cp == '\t') {
    149 				cp++;
    150 				continue;
    151 			}
    152 			if (q < &net_aliases[MAXALIASES - 1])
    153 				*q++ = cp;
    154 			cp = strpbrk(cp, " \t");
    155 			if (cp != NULL)
    156 				*cp++ = '\0';
    157 		}
    158 	}
    159 	*q = NULL;
    160 	return (&net);
    161 }
    162