Home | History | Annotate | Line # | Download | only in net
getnetent.c revision 1.11 
      1 /*	$NetBSD: getnetent.c,v 1.11 1997/07/21 14:07:56 jtc 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[] = "$Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp ";
     50 #else
     51 __RCSID("$NetBSD: getnetent.c,v 1.11 1997/07/21 14:07:56 jtc Exp $");
     52 #endif
     53 #endif /* LIBC_SCCS and not lint */
     54 
     55 #include "namespace.h"
     56 #include <sys/types.h>
     57 #include <sys/socket.h>
     58 #include <netinet/in.h>
     59 #include <arpa/inet.h>
     60 #include <netdb.h>
     61 #include <stdio.h>
     62 #include <string.h>
     63 
     64 #ifdef __weak_alias
     65 __weak_alias(endnetent,_endnetent);
     66 __weak_alias(getnetent,_getnetent);
     67 __weak_alias(setnetent,_setnetent);
     68 #endif
     69 
     70 #define	MAXALIASES	35
     71 
     72 static FILE *netf;
     73 static char line[BUFSIZ+1];
     74 static struct netent net;
     75 static char *net_aliases[MAXALIASES];
     76 int _net_stayopen;
     77 
     78 static void __setnetent __P((int));
     79 static void __endnetent __P((void));
     80 
     81 void
     82 setnetent(stayopen)
     83 	int stayopen;
     84 {
     85 
     86 	sethostent(stayopen);
     87 	__setnetent(stayopen);
     88 }
     89 
     90 void
     91 endnetent()
     92 {
     93 
     94 	endhostent();
     95 	__endnetent();
     96 }
     97 
     98 static void
     99 __setnetent(f)
    100 	int f;
    101 {
    102 
    103 	if (netf == NULL)
    104 		netf = fopen(_PATH_NETWORKS, "r" );
    105 	else
    106 		rewind(netf);
    107 	_net_stayopen |= f;
    108 }
    109 
    110 static void
    111 __endnetent()
    112 {
    113 
    114 	if (netf) {
    115 		fclose(netf);
    116 		netf = NULL;
    117 	}
    118 	_net_stayopen = 0;
    119 }
    120 
    121 struct netent *
    122 getnetent()
    123 {
    124 	char *p;
    125 	register char *cp, **q;
    126 
    127 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
    128 		return (NULL);
    129 again:
    130 	p = fgets(line, sizeof line, netf);
    131 	if (p == NULL)
    132 		return (NULL);
    133 	if (*p == '#')
    134 		goto again;
    135 	cp = strpbrk(p, "#\n");
    136 	if (cp == NULL)
    137 		goto again;
    138 	*cp = '\0';
    139 	net.n_name = p;
    140 	cp = strpbrk(p, " \t");
    141 	if (cp == NULL)
    142 		goto again;
    143 	*cp++ = '\0';
    144 	while (*cp == ' ' || *cp == '\t')
    145 		cp++;
    146 	p = strpbrk(cp, " \t");
    147 	if (p != NULL)
    148 		*p++ = '\0';
    149 	net.n_net = inet_network(cp);
    150 	net.n_addrtype = AF_INET;
    151 	q = net.n_aliases = net_aliases;
    152 	if (p != NULL)  {
    153 		cp = p;
    154 		while (cp && *cp) {
    155 			if (*cp == ' ' || *cp == '\t') {
    156 				cp++;
    157 				continue;
    158 			}
    159 			if (q < &net_aliases[MAXALIASES - 1])
    160 				*q++ = cp;
    161 			cp = strpbrk(cp, " \t");
    162 			if (cp != NULL)
    163 				*cp++ = '\0';
    164 		}
    165 	}
    166 	*q = NULL;
    167 	return (&net);
    168 }
    169