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getnetent.c revision 1.2 
      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[] = "from: @(#)getnetent.c	5.8 (Berkeley) 2/24/91";*/
     36 static char rcsid[] = "$Id: getnetent.c,v 1.2 1993/08/01 18:39:47 mycroft Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/types.h>
     40 #include <sys/socket.h>
     41 #include <netinet/in.h>
     42 #include <arpa/inet.h>
     43 #include <netdb.h>
     44 #include <stdio.h>
     45 #include <string.h>
     46 
     47 #define	MAXALIASES	35
     48 
     49 static FILE *netf;
     50 static char line[BUFSIZ+1];
     51 static struct netent net;
     52 static char *net_aliases[MAXALIASES];
     53 int _net_stayopen;
     54 
     55 void
     56 setnetent(f)
     57 	int f;
     58 {
     59 	if (netf == NULL)
     60 		netf = fopen(_PATH_NETWORKS, "r" );
     61 	else
     62 		rewind(netf);
     63 	_net_stayopen |= f;
     64 }
     65 
     66 void
     67 endnetent()
     68 {
     69 	if (netf) {
     70 		fclose(netf);
     71 		netf = NULL;
     72 	}
     73 	_net_stayopen = 0;
     74 }
     75 
     76 struct netent *
     77 getnetent()
     78 {
     79 	char *p;
     80 	register char *cp, **q;
     81 
     82 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
     83 		return (NULL);
     84 again:
     85 	p = fgets(line, BUFSIZ, netf);
     86 	if (p == NULL)
     87 		return (NULL);
     88 	if (*p == '#')
     89 		goto again;
     90 	cp = strpbrk(p, "#\n");
     91 	if (cp == NULL)
     92 		goto again;
     93 	*cp = '\0';
     94 	net.n_name = p;
     95 	cp = strpbrk(p, " \t");
     96 	if (cp == NULL)
     97 		goto again;
     98 	*cp++ = '\0';
     99 	while (*cp == ' ' || *cp == '\t')
    100 		cp++;
    101 	p = strpbrk(cp, " \t");
    102 	if (p != NULL)
    103 		*p++ = '\0';
    104 	net.n_net = inet_network(cp);
    105 	net.n_addrtype = AF_INET;
    106 	q = net.n_aliases = net_aliases;
    107 	if (p != NULL)
    108 		cp = p;
    109 	while (cp && *cp) {
    110 		if (*cp == ' ' || *cp == '\t') {
    111 			cp++;
    112 			continue;
    113 		}
    114 		if (q < &net_aliases[MAXALIASES - 1])
    115 			*q++ = cp;
    116 		cp = strpbrk(cp, " \t");
    117 		if (cp != NULL)
    118 			*cp++ = '\0';
    119 	}
    120 	*q = NULL;
    121 	return (&net);
    122 }
    123