lib/libc/net/getnetent.c

   1 /*      $NetBSD: getnetent.c,v 1.16 2004/05/08 18:52:15 kleink 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 1.16 2004/05/08 18:52:15 kleink 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 __P((int));
  75 static void __endnetent __P((void));
  76
  77 void
  78 setnetent(stayopen)
  79         int stayopen;
  80 {
  81
  82         sethostent(stayopen);
  83         __setnetent(stayopen);
  84 }
  85
  86 void
  87 endnetent()
  88 {
  89
  90         endhostent();
  91         __endnetent();
  92 }
  93
  94 static void
  95 __setnetent(f)
  96         int f;
  97 {
  98
  99         if (netf == NULL)
 100                 netf = fopen(_PATH_NETWORKS, "r" );
 101         else
 102                 rewind(netf);
 103         _net_stayopen |= f;
 104 }
 105
 106 static void
 107 __endnetent()
 108 {
 109
 110         if (netf) {
 111                 fclose(netf);
 112                 netf = NULL;
 113         }
 114         _net_stayopen = 0;
 115 }
 116
 117 struct netent *
 118 getnetent()
 119 {
 120         char *p;
 121         register char *cp, **q;
 122
 123         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
 124                 return (NULL);
 125 #if (defined(__sparc__) && defined(_LP64)) ||           \
 126     defined(__alpha__) ||                               \
 127     (defined(__i386__) && defined(_LP64)) ||            \
 128     (defined(__sh__) && defined(_LP64))
 129         net.__n_pad0 = 0;
 130 #endif
 131 again:
 132         p = fgets(line, sizeof line, netf);
 133         if (p == NULL)
 134                 return (NULL);
 135         if (*p == '#')
 136                 goto again;
 137         cp = strpbrk(p, "#\n");
 138         if (cp == NULL)
 139                 goto again;
 140         *cp = '\0';
 141         net.n_name = p;
 142         cp = strpbrk(p, " \t");
 143         if (cp == NULL)
 144                 goto again;
 145         *cp++ = '\0';
 146         while (*cp == ' ' || *cp == '\t')
 147                 cp++;
 148         p = strpbrk(cp, " \t");
 149         if (p != NULL)
 150                 *p++ = '\0';
 151         net.n_net = inet_network(cp);
 152         net.n_addrtype = AF_INET;
 153         q = net.n_aliases = net_aliases;
 154         if (p != NULL) {
 155                 cp = p;
 156                 while (cp && *cp) {
 157                         if (*cp == ' ' || *cp == '\t') {
 158                                 cp++;
 159                                 continue;
 160                         }
 161                         if (q < &net_aliases[MAXALIASES - 1])
 162                                 *q++ = cp;
 163                         cp = strpbrk(cp, " \t");
 164                         if (cp != NULL)
 165                                 *cp++ = '\0';
 166                 }
 167         }
 168         *q = NULL;
 169         return (&net);
 170 }