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getnetent.c revision 1.1.1.5 
      1 /*
      2  * Copyright (c) 1983, 1993
      3  *	The Regents of the University of California.  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[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
     36 #endif /* LIBC_SCCS and not lint */
     37 
     38 #include <sys/types.h>
     39 #include <sys/socket.h>
     40 #include <netinet/in.h>
     41 #include <arpa/inet.h>
     42 #include <netdb.h>
     43 #include <stdio.h>
     44 #include <string.h>
     45 
     46 #define	MAXALIASES	35
     47 
     48 static FILE *netf;
     49 static char line[BUFSIZ+1];
     50 static struct netent net;
     51 static char *net_aliases[MAXALIASES];
     52 int _net_stayopen;
     53 
     54 void
     55 setnetent(f)
     56 	int f;
     57 {
     58 	if (netf == NULL)
     59 		netf = fopen(_PATH_NETWORKS, "r" );
     60 	else
     61 		rewind(netf);
     62 	_net_stayopen |= f;
     63 }
     64 
     65 void
     66 endnetent()
     67 {
     68 	if (netf) {
     69 		fclose(netf);
     70 		netf = NULL;
     71 	}
     72 	_net_stayopen = 0;
     73 }
     74 
     75 struct netent *
     76 getnetent()
     77 {
     78 	char *p;
     79 	register char *cp, **q;
     80 
     81 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
     82 		return (NULL);
     83 again:
     84 	p = fgets(line, BUFSIZ, netf);
     85 	if (p == NULL)
     86 		return (NULL);
     87 	if (*p == '#')
     88 		goto again;
     89 	cp = strpbrk(p, "#\n");
     90 	if (cp == NULL)
     91 		goto again;
     92 	*cp = '\0';
     93 	net.n_name = p;
     94 	cp = strpbrk(p, " \t");
     95 	if (cp == NULL)
     96 		goto again;
     97 	*cp++ = '\0';
     98 	while (*cp == ' ' || *cp == '\t')
     99 		cp++;
    100 	p = strpbrk(cp, " \t");
    101 	if (p != NULL)
    102 		*p++ = '\0';
    103 	net.n_net = inet_network(cp);
    104 	net.n_addrtype = AF_INET;
    105 	q = net.n_aliases = net_aliases;
    106 	if (p != NULL)
    107 		cp = p;
    108 	while (cp && *cp) {
    109 		if (*cp == ' ' || *cp == '\t') {
    110 			cp++;
    111 			continue;
    112 		}
    113 		if (q < &net_aliases[MAXALIASES - 1])
    114 			*q++ = cp;
    115 		cp = strpbrk(cp, " \t");
    116 		if (cp != NULL)
    117 			*cp++ = '\0';
    118 	}
    119 	*q = NULL;
    120 	return (&net);
    121 }
    122