net/FreeBSD/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 __FBSDID("$FreeBSD: src/lib/libc/net/inet_addr.c,v 1.16 2002/04/19 04:46:20 suz Exp $");
  63
  64 #include <sys/param.h>
  65
  66 #include <netinet/in.h>
  67 #include <arpa/inet.h>
  68
  69 #include <ctype.h>
  70 #include <errno.h>
  71 #include <string.h>
  72 #include <stdlib.h>
  73
  74 /*
  75  * ASCII internet address interpretation routine.
  76  * The value returned is in network order.
  77  */
  78 in_addr_t               /* XXX should be struct in_addr :( */
  79 inet_addr(cp)
  80         const char *cp;
  81 {
  82         struct in_addr val;
  83
  84         if (inet_aton(cp, &val))
  85                 return (val.s_addr);
  86         return (INADDR_NONE);
  87 }
  88
  89 /*
  90  * Check whether "cp" is a valid ASCII representation
  91  * of an Internet address and convert to a binary address.
  92  * Returns 1 if the address is valid, 0 if not.
  93  * This replaces inet_addr, the return value from which
  94  * cannot distinguish between failure and a local broadcast address.
  95  */
  96 int
  97 inet_aton(cp, addr)
  98         const char *cp;
  99         struct in_addr *addr;
 100 {
 101         u_long parts[4];
 102         in_addr_t val;
 103         char *c;
 104         char *endptr;
 105         int gotend, n;
 106
 107         c = (char *)cp;
 108         n = 0;
 109         /*
 110          * Run through the string, grabbing numbers until
 111          * the end of the string, or some error
 112          */
 113         gotend = 0;
 114         while (!gotend) {
 115                 errno = 0;
 116                 val = strtoul(c, &endptr, 0);
 117
 118                 if (errno == ERANGE)    /* Fail completely if it overflowed. */
 119                         return (0);
 120
 121                 /*
 122                  * If the whole string is invalid, endptr will equal
 123                  * c.. this way we can make sure someone hasn't
 124                  * gone '.12' or something which would get past
 125                  * the next check.
 126                  */
 127                 if (endptr == c)
 128                         return (0);
 129                 parts[n] = val;
 130                 c = endptr;
 131
 132                 /* Check the next character past the previous number's end */
 133                 switch (*c) {
 134                 case '.' :
 135                         /* Make sure we only do 3 dots .. */
 136                         if (n == 3)     /* Whoops. Quit. */
 137                                 return (0);
 138                         n++;
 139                         c++;
 140                         break;
 141
 142                 case '\0':
 143                         gotend = 1;
 144                         break;
 145
 146                 default:
 147                         if (isspace((unsigned char)*c)) {
 148                                 gotend = 1;
 149                                 break;
 150                         } else
 151                                 return (0);     /* Invalid character, so fail */
 152                 }
 153
 154         }
 155
 156         /*
 157          * Concoct the address according to
 158          * the number of parts specified.
 159          */
 160
 161         switch (n) {
 162         case 0:                         /* a -- 32 bits */
 163                 /*
 164                  * Nothing is necessary here.  Overflow checking was
 165                  * already done in strtoul().
 166                  */
 167                 break;
 168         case 1:                         /* a.b -- 8.24 bits */
 169                 if (val > 0xffffff || parts[0] > 0xff)
 170                         return (0);
 171                 val |= parts[0] << 24;
 172                 break;
 173
 174         case 2:                         /* a.b.c -- 8.8.16 bits */
 175                 if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
 176                         return (0);
 177                 val |= (parts[0] << 24) | (parts[1] << 16);
 178                 break;
 179
 180         case 3:                         /* a.b.c.d -- 8.8.8.8 bits */
 181                 if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
 182                     parts[2] > 0xff)
 183                         return (0);
 184                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 185                 break;
 186         }
 187
 188         if (addr != NULL)
 189                 addr->s_addr = htonl(val);
 190         return (1);
 191 }
 192
 193 /*
 194  * Weak aliases for applications that use certain private entry points,
 195  * and fail to include <arpa/inet.h>.
 196  */
 197 #undef inet_addr
 198 __weak_reference(__inet_addr, inet_addr);
 199 #undef inet_aton
 200 __weak_reference(__inet_aton, inet_aton);