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getnetent.c revision 1.22 
      1 /*	$NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  * Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
     32  *    Dep. Matematica Universidade de Coimbra, Portugal, Europe
     33  *
     34  * Permission to use, copy, modify, and distribute this software for any
     35  * purpose with or without fee is hereby granted, provided that the above
     36  * copyright notice and this permission notice appear in all copies.
     37  *
     38  * from getnetent.c   1.1 (Coimbra) 93/06/02
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 #if 0
     44 static char sccsid[] = "@(#)getnetent.c	8.1 (Berkeley) 6/4/93";
     45 static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp ";
     46 #else
     47 __RCSID("$NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia Exp $");
     48 #endif
     49 #endif /* LIBC_SCCS and not lint */
     50 
     51 #include "namespace.h"
     52 #include <sys/types.h>
     53 #include <sys/socket.h>
     54 #include <netinet/in.h>
     55 #include <arpa/inet.h>
     56 #include <netdb.h>
     57 #include <stdio.h>
     58 #include <string.h>
     59 
     60 #ifdef __weak_alias
     61 __weak_alias(endnetent,_endnetent)
     62 __weak_alias(getnetent,_getnetent)
     63 __weak_alias(setnetent,_setnetent)
     64 #endif
     65 
     66 #define	MAXALIASES	35
     67 
     68 static FILE *netf;
     69 static char line[BUFSIZ+1];
     70 static struct netent net;
     71 static char *net_aliases[MAXALIASES];
     72 int _net_stayopen;
     73 
     74 static void __setnetent(int);
     75 static void __endnetent(void);
     76 
     77 void
     78 setnetent(int stayopen)
     79 {
     80 
     81 	sethostent(stayopen);
     82 	__setnetent(stayopen);
     83 }
     84 
     85 void
     86 endnetent(void)
     87 {
     88 
     89 	endhostent();
     90 	__endnetent();
     91 }
     92 
     93 static void
     94 __setnetent(int f)
     95 {
     96 
     97 	if (netf == NULL)
     98 		netf = fopen(_PATH_NETWORKS, "re");
     99 	else
    100 		rewind(netf);
    101 	_net_stayopen |= f;
    102 }
    103 
    104 static void
    105 __endnetent(void)
    106 {
    107 
    108 	if (netf) {
    109 		fclose(netf);
    110 		netf = NULL;
    111 	}
    112 	_net_stayopen = 0;
    113 }
    114 
    115 struct netent *
    116 getnetent(void)
    117 {
    118 	char *p;
    119 	register char *cp, **q;
    120 
    121 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL)
    122 		return (NULL);
    123 #if (defined(__sparc__) && defined(_LP64)) ||		\
    124     defined(__alpha__)
    125 	net.__n_pad0 = 0;
    126 #endif
    127 again:
    128 	p = fgets(line, (int)sizeof line, netf);
    129 	if (p == NULL)
    130 		return (NULL);
    131 	if (*p == '#')
    132 		goto again;
    133 	cp = strpbrk(p, "#\n");
    134 	if (cp == NULL)
    135 		goto again;
    136 	*cp = '\0';
    137 	net.n_name = p;
    138 	cp = strpbrk(p, " \t");
    139 	if (cp == NULL)
    140 		goto again;
    141 	*cp++ = '\0';
    142 	while (*cp == ' ' || *cp == '\t')
    143 		cp++;
    144 	p = strpbrk(cp, " \t");
    145 	if (p != NULL)
    146 		*p++ = '\0';
    147 	net.n_net = inet_network(cp);
    148 	net.n_addrtype = AF_INET;
    149 	q = net.n_aliases = net_aliases;
    150 	if (p != NULL) {
    151 		cp = p;
    152 		while (cp && *cp) {
    153 			if (*cp == ' ' || *cp == '\t') {
    154 				cp++;
    155 				continue;
    156 			}
    157 			if (q < &net_aliases[MAXALIASES - 1])
    158 				*q++ = cp;
    159 			cp = strpbrk(cp, " \t");
    160 			if (cp != NULL)
    161 				*cp++ = '\0';
    162 		}
    163 	}
    164 	*q = NULL;
    165 	return (&net);
    166 }
    167