lib/libc/net/getnetent.c

   1 /*      $NetBSD: getnetent.c,v 1.21 2012/03/20 17:44:18 matt 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 1.21 2012/03/20 17:44:18 matt 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(int);
  75 static void __endnetent(void);
  76
  77 void
  78 setnetent(int stayopen)
  79 {
  80
  81         sethostent(stayopen);
  82         __setnetent(stayopen);
  83 }
  84
  85 void
  86 endnetent(void)
  87 {
  88
  89         endhostent();
  90         __endnetent();
  91 }
  92
  93 static void
  94 __setnetent(int f)
  95 {
  96
  97         if (netf == NULL)
  98                 netf = fopen(_PATH_NETWORKS, "re");
  99         else
 100                 rewind(netf);
 101         _net_stayopen |= f;
 102 }
 103
 104 static void
 105 __endnetent(void)
 106 {
 107
 108         if (netf) {
 109                 fclose(netf);
 110                 netf = NULL;
 111         }
 112         _net_stayopen = 0;
 113 }
 114
 115 struct netent *
 116 getnetent(void)
 117 {
 118         char *p;
 119         register char *cp, **q;
 120
 121         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL)
 122                 return (NULL);
 123 #if (defined(__sparc__) && defined(_LP64)) ||           \
 124     defined(__alpha__) ||                               \
 125     (defined(__i386__) && defined(_LP64)) ||            \
 126     (defined(__sh__) && defined(_LP64))
 127         net.__n_pad0 = 0;
 128 #endif
 129 again:
 130         p = fgets(line, (int)sizeof line, netf);
 131         if (p == NULL)
 132                 return (NULL);
 133         if (*p == '#')
 134                 goto again;
 135         cp = strpbrk(p, "#\n");
 136         if (cp == NULL)
 137                 goto again;
 138         *cp = '\0';
 139         net.n_name = p;
 140         cp = strpbrk(p, " \t");
 141         if (cp == NULL)
 142                 goto again;
 143         *cp++ = '\0';
 144         while (*cp == ' ' || *cp == '\t')
 145                 cp++;
 146         p = strpbrk(cp, " \t");
 147         if (p != NULL)
 148                 *p++ = '\0';
 149         net.n_net = inet_network(cp);
 150         net.n_addrtype = AF_INET;
 151         q = net.n_aliases = net_aliases;
 152         if (p != NULL) {
 153                 cp = p;
 154                 while (cp && *cp) {
 155                         if (*cp == ' ' || *cp == '\t') {
 156                                 cp++;
 157                                 continue;
 158                         }
 159                         if (q < &net_aliases[MAXALIASES - 1])
 160                                 *q++ = cp;
 161                         cp = strpbrk(cp, " \t");
 162                         if (cp != NULL)
 163                                 *cp++ = '\0';
 164                 }
 165         }
 166         *q = NULL;
 167         return (&net);
 168 }