dns.subproj/getnetent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983 Regents of the University of California.
  26  * All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
  58  *      Dep. Matematica Universidade de Coimbra, Portugal, Europe
  59  *
  60  * Permission to use, copy, modify, and distribute this software for any
  61  * purpose with or without fee is hereby granted, provided that the above
  62  * copyright notice and this permission notice appear in all copies.
  63  *
  64  * from getnetent.c     1.1 (Coimbra) 93/06/02
  65  */
  66
  67 #if defined(LIBC_SCCS) && !defined(lint)
  68 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
  69 static char rcsid[] = "$Id: getnetent.c,v 1.3 2002/06/12 17:40:29 epeyton Exp $";
  70 #endif /* LIBC_SCCS and not lint */
  71
  72 #include <sys/param.h>
  73 #include <sys/socket.h>
  74 #include <netinet/in.h>
  75 #include <arpa/inet.h>
  76 #include <arpa/nameser.h>
  77
  78 #include <stdio.h>
  79 #include <stdlib.h>
  80 #include <resolv.h>
  81 #include <netdb.h>
  82 #include <string.h>
  83
  84 #ifndef _PATH_NETWORKS
  85 #define _PATH_NETWORKS  "/etc/networks"
  86 #endif
  87
  88 #define MAXALIASES      35
  89
  90 static FILE *netf;
  91 static struct netent net;
  92 static char *net_aliases[MAXALIASES];
  93 #if defined(__APPLE__)
  94 extern
  95 #endif
  96 int _net_stayopen;
  97
  98 void _setnetent __P((int));
  99 void _endnetent __P((void));
 100
 101 void
 102 setnetent(stayopen)
 103         int stayopen;
 104 {
 105
 106         sethostent(stayopen);
 107         _setnetent(stayopen);
 108 }
 109
 110 void
 111 endnetent()
 112 {
 113
 114         endhostent();
 115         _endnetent();
 116 }
 117
 118 void
 119 _setnetent(f)
 120         int f;
 121 {
 122
 123         if (netf == NULL)
 124                 netf = fopen(_PATH_NETWORKS, "r" );
 125         else
 126                 rewind(netf);
 127         _net_stayopen |= f;
 128 }
 129
 130 void
 131 _endnetent()
 132 {
 133
 134         if (netf) {
 135                 fclose(netf);
 136                 netf = NULL;
 137         }
 138         _net_stayopen = 0;
 139 }
 140
 141 struct netent *
 142 getnetent()
 143 {
 144         char *p;
 145         static char *line = NULL;
 146         register char *cp, **q;
 147
 148         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
 149                 return (NULL);
 150
 151         if (line == NULL) {
 152                 line = malloc(BUFSIZ+1);
 153                 if (line == NULL)
 154                         return (NULL);
 155         }
 156 again:
 157         p = fgets(line, BUFSIZ, netf);
 158         if (p == NULL)
 159                 return (NULL);
 160         if (*p == '#')
 161                 goto again;
 162         cp = strpbrk(p, "#\n");
 163         if (cp == NULL)
 164                 goto again;
 165         *cp = '\0';
 166         net.n_name = p;
 167         cp = strpbrk(p, " \t");
 168         if (cp == NULL)
 169                 goto again;
 170         *cp++ = '\0';
 171         while (*cp == ' ' || *cp == '\t')
 172                 cp++;
 173         p = strpbrk(cp, " \t");
 174         if (p != NULL)
 175                 *p++ = '\0';
 176         net.n_net = inet_network(cp);
 177         net.n_addrtype = AF_INET;
 178         q = net.n_aliases = net_aliases;
 179         if (p != NULL)
 180                 cp = p;
 181         while (cp && *cp) {
 182                 if (*cp == ' ' || *cp == '\t') {
 183                         cp++;
 184                         continue;
 185                 }
 186                 if (q < &net_aliases[MAXALIASES - 1])
 187                         *q++ = cp;
 188                 cp = strpbrk(cp, " \t");
 189                 if (cp != NULL)
 190                         *cp++ = '\0';
 191         }
 192         *q = NULL;
 193         return (&net);
 194 }