lib/libc/inet/inet_addr.c

   1 /*
   2  * Copyright (c) 1983, 1990, 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
  30 /*
  31  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  32  *
  33  * Permission to use, copy, modify, and distribute this software for any
  34  * purpose with or without fee is hereby granted, provided that the above
  35  * copyright notice and this permission notice appear in all copies, and that
  36  * the name of Digital Equipment Corporation not be used in advertising or
  37  * publicity pertaining to distribution of the document or software without
  38  * specific, written prior permission.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  41  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  42  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  43  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  44  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  45  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  46  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  47  * SOFTWARE.
  48  */
  49
  50 /*
  51  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  52  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  53  *
  54  * Permission to use, copy, modify, and distribute this software for any
  55  * purpose with or without fee is hereby granted, provided that the above
  56  * copyright notice and this permission notice appear in all copies.
  57  *
  58  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  59  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  60  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  61  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  62  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  63  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  64  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  65  *
  66  * @(#)inet_addr.c      8.1 (Berkeley) 6/17/93
  67  * $Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $
  68  */
  69
  70 #include "port_before.h"
  71
  72 #include <sys/types.h>
  73 #include <sys/param.h>
  74
  75 #include <netinet/in.h>
  76 #include <arpa/inet.h>
  77
  78 #include <ctype.h>
  79
  80 #include "port_after.h"
  81
  82 /*%
  83  * Ascii internet address interpretation routine.
  84  * The value returned is in network order.
  85  */
  86 in_addr_t
  87 inet_addr(const char *cp) {
  88         struct in_addr val;
  89
  90         if (inet_aton(cp, &val))
  91                 return (val.s_addr);
  92         return (INADDR_NONE);
  93 }
  94
  95 /*%
  96  * Check whether "cp" is a valid ascii representation
  97  * of an Internet address and convert to a binary address.
  98  * Returns 1 if the address is valid, 0 if not.
  99  * This replaces inet_addr, the return value from which
 100  * cannot distinguish between failure and a local broadcast address.
 101  */
 102 int
 103 inet_aton(const char *cp, struct in_addr *addr) {
 104         u_long val;
 105         int base, n;
 106         char c;
 107         u_int8_t parts[4];
 108         u_int8_t *pp = parts;
 109         int digit;
 110
 111         c = *cp;
 112         for (;;) {
 113                 /*
 114                  * Collect number up to ``.''.
 115                  * Values are specified as for C:
 116                  * 0x=hex, 0=octal, isdigit=decimal.
 117                  */
 118                 if (!isdigit((unsigned char)c))
 119                         return (0);
 120                 val = 0; base = 10; digit = 0;
 121                 if (c == '0') {
 122                         c = *++cp;
 123                         if (c == 'x' || c == 'X')
 124                                 base = 16, c = *++cp;
 125                         else {
 126                                 base = 8;
 127                                 digit = 1 ;
 128                         }
 129                 }
 130                 for (;;) {
 131                         if (isascii(c) && isdigit((unsigned char)c)) {
 132                                 if (base == 8 && (c == '8' || c == '9'))
 133                                         return (0);
 134                                 val = (val * base) + (c - '0');
 135                                 c = *++cp;
 136                                 digit = 1;
 137                         } else if (base == 16 && isascii(c) &&
 138                                    isxdigit((unsigned char)c)) {
 139                                 val = (val << 4) |
 140                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 141                                 c = *++cp;
 142                                 digit = 1;
 143                         } else
 144                                 break;
 145                 }
 146                 if (c == '.') {
 147                         /*
 148                          * Internet format:
 149                          *      a.b.c.d
 150                          *      a.b.c   (with c treated as 16 bits)
 151                          *      a.b     (with b treated as 24 bits)
 152                          */
 153                         if (pp >= parts + 3 || val > 0xffU)
 154                                 return (0);
 155                         *pp++ = val;
 156                         c = *++cp;
 157                 } else
 158                         break;
 159         }
 160         /*
 161          * Check for trailing characters.
 162          */
 163         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 164                 return (0);
 165         /*
 166          * Did we get a valid digit?
 167          */
 168         if (!digit)
 169                 return (0);
 170         /*
 171          * Concoct the address according to
 172          * the number of parts specified.
 173          */
 174         n = pp - parts + 1;
 175         switch (n) {
 176         case 1:                         /*%< a -- 32 bits */
 177                 break;
 178
 179         case 2:                         /*%< a.b -- 8.24 bits */
 180                 if (val > 0xffffffU)
 181                         return (0);
 182                 val |= parts[0] << 24;
 183                 break;
 184
 185         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 186                 if (val > 0xffffU)
 187                         return (0);
 188                 val |= (parts[0] << 24) | (parts[1] << 16);
 189                 break;
 190
 191         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 192                 if (val > 0xffU)
 193                         return (0);
 194                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 195                 break;
 196         }
 197         if (addr != NULL)
 198                 addr->s_addr = htonl(val);
 199         return (1);
 200 }
 201
 202 /*
 203  * Weak aliases for applications that use certain private entry points,
 204  * and fail to include <arpa/inet.h>.
 205  */
 206 #undef inet_addr
 207 __weak_reference(__inet_addr, inet_addr);
 208 #undef inet_aton
 209 __weak_reference(__inet_aton, inet_aton);