dns.subproj/getnetent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983 Regents of the University of California.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
  59  *      Dep. Matematica Universidade de Coimbra, Portugal, Europe
  60  *
  61  * Permission to use, copy, modify, and distribute this software for any
  62  * purpose with or without fee is hereby granted, provided that the above
  63  * copyright notice and this permission notice appear in all copies.
  64  *
  65  * from getnetent.c     1.1 (Coimbra) 93/06/02
  66  */
  67
  68 #if defined(LIBC_SCCS) && !defined(lint)
  69 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
  70 static char rcsid[] = "$Id: getnetent.c,v 1.4 2003/02/18 17:29:23 majka Exp $";
  71 #endif /* LIBC_SCCS and not lint */
  72
  73 #include <sys/param.h>
  74 #include <sys/socket.h>
  75 #include <netinet/in.h>
  76 #include <arpa/inet.h>
  77 #include <arpa/nameser8_compat.h>
  78
  79 #include <stdio.h>
  80 #include <stdlib.h>
  81 #include <resolv8_compat.h>
  82 #include <netdb.h>
  83 #include <string.h>
  84
  85 #ifndef _PATH_NETWORKS
  86 #define _PATH_NETWORKS  "/etc/networks"
  87 #endif
  88
  89 #define MAXALIASES      35
  90
  91 static FILE *netf;
  92 static struct netent net;
  93 static char *net_aliases[MAXALIASES];
  94 #if defined(__APPLE__)
  95 extern
  96 #endif
  97 int _net_stayopen;
  98
  99 void _setnetent __P((int));
 100 void _endnetent __P((void));
 101
 102 void
 103 setnetent(stayopen)
 104         int stayopen;
 105 {
 106
 107         sethostent(stayopen);
 108         _setnetent(stayopen);
 109 }
 110
 111 void
 112 endnetent()
 113 {
 114
 115         endhostent();
 116         _endnetent();
 117 }
 118
 119 void
 120 _setnetent(f)
 121         int f;
 122 {
 123
 124         if (netf == NULL)
 125                 netf = fopen(_PATH_NETWORKS, "r" );
 126         else
 127                 rewind(netf);
 128         _net_stayopen |= f;
 129 }
 130
 131 void
 132 _endnetent()
 133 {
 134
 135         if (netf) {
 136                 fclose(netf);
 137                 netf = NULL;
 138         }
 139         _net_stayopen = 0;
 140 }
 141
 142 struct netent *
 143 getnetent()
 144 {
 145         char *p;
 146         static char *line = NULL;
 147         register char *cp, **q;
 148
 149         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
 150                 return (NULL);
 151
 152         if (line == NULL) {
 153                 line = malloc(BUFSIZ+1);
 154                 if (line == NULL)
 155                         return (NULL);
 156         }
 157 again:
 158         p = fgets(line, BUFSIZ, netf);
 159         if (p == NULL)
 160                 return (NULL);
 161         if (*p == '#')
 162                 goto again;
 163         cp = strpbrk(p, "#\n");
 164         if (cp == NULL)
 165                 goto again;
 166         *cp = '\0';
 167         net.n_name = p;
 168         cp = strpbrk(p, " \t");
 169         if (cp == NULL)
 170                 goto again;
 171         *cp++ = '\0';
 172         while (*cp == ' ' || *cp == '\t')
 173                 cp++;
 174         p = strpbrk(cp, " \t");
 175         if (p != NULL)
 176                 *p++ = '\0';
 177         net.n_net = inet_network(cp);
 178         net.n_addrtype = AF_INET;
 179         q = net.n_aliases = net_aliases;
 180         if (p != NULL)
 181                 cp = p;
 182         while (cp && *cp) {
 183                 if (*cp == ' ' || *cp == '\t') {
 184                         cp++;
 185                         continue;
 186                 }
 187                 if (q < &net_aliases[MAXALIASES - 1])
 188                         *q++ = cp;
 189                 cp = strpbrk(cp, " \t");
 190                 if (cp != NULL)
 191                         *cp++ = '\0';
 192         }
 193         *q = NULL;
 194         return (&net);
 195 }