pnacl/inet_addr.c

   1 /*      $KAME: inet_addr.c,v 1.5 2001/08/20 02:32:40 itojun Exp $       */
   2
   3 /*
   4  * ++Copyright++ 1983, 1990, 1993
   5  * -
   6  * Copyright (c) 1983, 1990, 1993
   7  *    The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  * -
  37  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  38  *
  39  * Permission to use, copy, modify, and distribute this software for any
  40  * purpose with or without fee is hereby granted, provided that the above
  41  * copyright notice and this permission notice appear in all copies, and that
  42  * the name of Digital Equipment Corporation not be used in advertising or
  43  * publicity pertaining to distribution of the document or software without
  44  * specific, written prior permission.
  45  *
  46  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  47  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  48  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  49  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  50  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  51  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  52  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  53  * SOFTWARE.
  54  * -
  55  * --Copyright--
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  60 #endif /* LIBC_SCCS and not lint */
  61 #include <sys/cdefs.h>
  62 #include <sys/types.h>
  63 #include <machine/endian.h>
  64
  65 #include <sys/param.h>
  66
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69
  70 #include <ctype.h>
  71 #include <errno.h>
  72 #include <string.h>
  73 #include <stdlib.h>
  74
  75 /*
  76  * ASCII internet address interpretation routine.
  77  * The value returned is in network order.
  78  */
  79 in_addr_t               /* XXX should be struct in_addr :( */
  80 inet_addr(cp)
  81         const char *cp;
  82 {
  83         struct in_addr val;
  84
  85         if (inet_aton(cp, &val))
  86                 return (val.s_addr);
  87         return (INADDR_NONE);
  88 }
  89
  90 /*
  91  * Check whether "cp" is a valid ASCII representation
  92  * of an Internet address and convert to a binary address.
  93  * Returns 1 if the address is valid, 0 if not.
  94  * This replaces inet_addr, the return value from which
  95  * cannot distinguish between failure and a local broadcast address.
  96  */
  97 int
  98 inet_aton(cp, addr)
  99         const char *cp;
 100         struct in_addr *addr;
 101 {
 102         u_long parts[4];
 103         in_addr_t val;
 104         char *c;
 105         char *endptr;
 106         int gotend, n;
 107
 108         c = (char *)cp;
 109         n = 0;
 110         /*
 111          * Run through the string, grabbing numbers until
 112          * the end of the string, or some error
 113          */
 114         gotend = 0;
 115         while (!gotend) {
 116                 errno = 0;
 117                 val = strtoul(c, &endptr, 0);
 118
 119                 if (errno == ERANGE)    /* Fail completely if it overflowed. */
 120                         return (0);
 121
 122                 /*
 123                  * If the whole string is invalid, endptr will equal
 124                  * c.. this way we can make sure someone hasn't
 125                  * gone '.12' or something which would get past
 126                  * the next check.
 127                  */
 128                 if (endptr == c)
 129                         return (0);
 130                 parts[n] = val;
 131                 c = endptr;
 132
 133                 /* Check the next character past the previous number's end */
 134                 switch (*c) {
 135                 case '.' :
 136                         /* Make sure we only do 3 dots .. */
 137                         if (n == 3)     /* Whoops. Quit. */
 138                                 return (0);
 139                         n++;
 140                         c++;
 141                         break;
 142
 143                 case '\0':
 144                         gotend = 1;
 145                         break;
 146
 147                 default:
 148                         if (isspace((unsigned char)*c)) {
 149                                 gotend = 1;
 150                                 break;
 151                         } else
 152                                 return (0);     /* Invalid character, so fail */
 153                 }
 154
 155         }
 156
 157         /*
 158          * Concoct the address according to
 159          * the number of parts specified.
 160          */
 161
 162         switch (n) {
 163         case 0:                         /* a -- 32 bits */
 164                 /*
 165                  * Nothing is necessary here.  Overflow checking was
 166                  * already done in strtoul().
 167                  */
 168                 break;
 169         case 1:                         /* a.b -- 8.24 bits */
 170                 if (val > 0xffffff || parts[0] > 0xff)
 171                         return (0);
 172                 val |= parts[0] << 24;
 173                 break;
 174
 175         case 2:                         /* a.b.c -- 8.8.16 bits */
 176                 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
 177                         return (0);
 178                 val |= (parts[0] << 24) | (parts[1] << 16);
 179                 break;
 180
 181         case 3:                         /* a.b.c.d -- 8.8.8.8 bits */
 182                 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
 183                     parts[2] > 0xff)
 184                         return (0);
 185                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 186                 break;
 187         }
 188
 189         if (addr != NULL)
 190                 addr->s_addr = htonl(val);
 191         return (1);
 192 }
 193
 194 #if 0
 195 /*
 196  * Weak aliases for applications that use certain private entry points,
 197  * and fail to include <arpa/inet.h>.
 198  */
 199 #undef inet_addr
 200 __weak_reference(__inet_addr, inet_addr);
 201 #undef inet_aton
 202 __weak_reference(__inet_aton, inet_aton);
 203 #endif