lib/libc/net/getnetbyht.c

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)getnetent.c      8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/net/getnetbyht.c,v 1.7.2.1 2002/07/07 11:34:42 robert Exp $
  31  * $DragonFly: src/lib/libc/net/getnetbyht.c,v 1.5 2005/11/13 03:04:47 swildner Exp $
  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 #include <sys/types.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <arpa/nameser.h>
  49 #include <netdb.h>
  50 #include <stdio.h>
  51 #include <string.h>
  52
  53 #define MAXALIASES      35
  54
  55 static FILE *netf;
  56 static char line[BUFSIZ+1];
  57 static struct netent net;
  58 static char *net_aliases[MAXALIASES];
  59 static int _net_stayopen;
  60
  61 void
  62 _setnethtent(int f)
  63 {
  64
  65         if (netf == NULL)
  66                 netf = fopen(_PATH_NETWORKS, "r" );
  67         else
  68                 rewind(netf);
  69         _net_stayopen |= f;
  70 }
  71
  72 void
  73 _endnethtent(void)
  74 {
  75
  76         if (netf) {
  77                 fclose(netf);
  78                 netf = NULL;
  79         }
  80         _net_stayopen = 0;
  81 }
  82
  83 struct netent *
  84 getnetent(void)
  85 {
  86         char *p;
  87         char *cp, **q;
  88
  89         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
  90                 return (NULL);
  91 again:
  92         p = fgets(line, sizeof line, netf);
  93         if (p == NULL)
  94                 return (NULL);
  95         if (*p == '#')
  96                 goto again;
  97         cp = strpbrk(p, "#\n");
  98         if (cp == NULL)
  99                 goto again;
 100         *cp = '\0';
 101         net.n_name = p;
 102         cp = strpbrk(p, " \t");
 103         if (cp == NULL)
 104                 goto again;
 105         *cp++ = '\0';
 106         while (*cp == ' ' || *cp == '\t')
 107                 cp++;
 108         p = strpbrk(cp, " \t");
 109         if (p != NULL)
 110                 *p++ = '\0';
 111         net.n_net = inet_network(cp);
 112         net.n_addrtype = AF_INET;
 113         q = net.n_aliases = net_aliases;
 114         if (p != NULL)
 115                 cp = p;
 116         while (cp && *cp) {
 117                 if (*cp == ' ' || *cp == '\t') {
 118                         cp++;
 119                         continue;
 120                 }
 121                 if (q < &net_aliases[MAXALIASES - 1])
 122                         *q++ = cp;
 123                 cp = strpbrk(cp, " \t");
 124                 if (cp != NULL)
 125                         *cp++ = '\0';
 126         }
 127         *q = NULL;
 128         return (&net);
 129 }
 130
 131 struct netent *
 132 _getnetbyhtname(const char *name)
 133 {
 134         struct netent *p;
 135         char **cp;
 136
 137         setnetent(_net_stayopen);
 138         while ( (p = getnetent()) ) {
 139                 if (strcasecmp(p->n_name, name) == 0)
 140                         break;
 141                 for (cp = p->n_aliases; *cp != 0; cp++)
 142                         if (strcasecmp(*cp, name) == 0)
 143                                 goto found;
 144         }
 145 found:
 146         if (!_net_stayopen)
 147                 endnetent();
 148         return (p);
 149 }
 150
 151 struct netent *
 152 _getnetbyhtaddr(unsigned long net, int type)
 153 {
 154         struct netent *p;
 155
 156         setnetent(_net_stayopen);
 157         while ( (p = getnetent()) )
 158                 if (p->n_addrtype == type && p->n_net == net)
 159                         break;
 160         if (!_net_stayopen)
 161                 endnetent();
 162         return (p);
 163 }