resolv/getnetent.c

   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 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
  35  *      Dep. Matematica Universidade de Coimbra, Portugal, Europe
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies.
  40  *
  41  * from getnetent.c     1.1 (Coimbra) 93/06/02
  42  */
  43
  44 #if defined(LIBC_SCCS) && !defined(lint)
  45 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
  46 static char rcsid[] = "$Id$";
  47 #endif /* LIBC_SCCS and not lint */
  48
  49 #include <sys/param.h>
  50 #include <sys/socket.h>
  51 #include <netinet/in.h>
  52 #include <arpa/inet.h>
  53 #include <arpa/nameser.h>
  54
  55 #include <stdio.h>
  56 #include <resolv.h>
  57 #include <netdb.h>
  58 #include <string.h>
  59
  60 #ifndef _PATH_NETWORKS
  61 #define _PATH_NETWORKS  "/etc/networks"
  62 #endif
  63
  64 #define MAXALIASES      35
  65
  66 static FILE *netf;
  67 static char line[BUFSIZ+1];
  68 static struct netent net;
  69 static char *net_aliases[MAXALIASES];
  70 int _net_stayopen;
  71
  72 void _setnetent __P((int));
  73 void _endnetent __P((void));
  74
  75 void
  76 setnetent(stayopen)
  77         int stayopen;
  78 {
  79
  80         sethostent(stayopen);
  81         _setnetent(stayopen);
  82 }
  83
  84 void
  85 endnetent()
  86 {
  87
  88         endhostent();
  89         _endnetent();
  90 }
  91
  92 void
  93 _setnetent(f)
  94         int f;
  95 {
  96
  97         if (netf == NULL)
  98                 netf = fopen(_PATH_NETWORKS, "r" );
  99         else
 100                 rewind(netf);
 101         _net_stayopen |= f;
 102 }
 103
 104 void
 105 _endnetent()
 106 {
 107
 108         if (netf) {
 109                 fclose(netf);
 110                 netf = NULL;
 111         }
 112         _net_stayopen = 0;
 113 }
 114
 115 struct netent *
 116 getnetent()
 117 {
 118         char *p;
 119         register char *cp, **q;
 120
 121         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
 122                 return (NULL);
 123 again:
 124         p = fgets(line, BUFSIZ, netf);
 125         if (p == NULL)
 126                 return (NULL);
 127         if (*p == '#')
 128                 goto again;
 129         cp = strpbrk(p, "#\n");
 130         if (cp == NULL)
 131                 goto again;
 132         *cp = '\0';
 133         net.n_name = p;
 134         cp = strpbrk(p, " \t");
 135         if (cp == NULL)
 136                 goto again;
 137         *cp++ = '\0';
 138         while (*cp == ' ' || *cp == '\t')
 139                 cp++;
 140         p = strpbrk(cp, " \t");
 141         if (p != NULL)
 142                 *p++ = '\0';
 143         net.n_net = inet_network(cp);
 144         net.n_addrtype = AF_INET;
 145         q = net.n_aliases = net_aliases;
 146         if (p != NULL)
 147                 cp = p;
 148         while (cp && *cp) {
 149                 if (*cp == ' ' || *cp == '\t') {
 150                         cp++;
 151                         continue;
 152                 }
 153                 if (q < &net_aliases[MAXALIASES - 1])
 154                         *q++ = cp;
 155                 cp = strpbrk(cp, " \t");
 156                 if (cp != NULL)
 157                         *cp++ = '\0';
 158         }
 159         *q = NULL;
 160         return (&net);
 161 }