StdLib/LibC/NetUtil/inet_addr.c

   1 /** @file
   2   Convert a string internet address into an integer (32-bit) address.
   3
   4   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13  * Copyright (c) 1983, 1990, 1993
  14  *    The Regents of the University of California.  All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. All advertising materials mentioning features or use of this software
  25  *    must display the following acknowledgement:
  26  *  This product includes software developed by the University of
  27  *  California, Berkeley and its contributors.
  28  * 4. Neither the name of the University nor the names of its contributors
  29  *    may be used to endorse or promote products derived from this software
  30  *    without specific prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  42  * SUCH DAMAGE.
  43
  44  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  45  *
  46  * Permission to use, copy, modify, and distribute this software for any
  47  * purpose with or without fee is hereby granted, provided that the above
  48  * copyright notice and this permission notice appear in all copies, and that
  49  * the name of Digital Equipment Corporation not be used in advertising or
  50  * publicity pertaining to distribution of the document or software without
  51  * specific, written prior permission.
  52  *
  53  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  54  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  55  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  56  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  57  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  58  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  59  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  60  * SOFTWARE.
  61
  62  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  63  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  64  *
  65  * Permission to use, copy, modify, and distribute this software for any
  66  * purpose with or without fee is hereby granted, provided that the above
  67  * copyright notice and this permission notice appear in all copies.
  68  *
  69  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  70  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  71  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  72  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  73  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  74  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  75  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  76
  77   NetBSD: inet_addr.c,v 1.1 2005/12/20 19:28:51 christos Exp
  78   inet_addr.c 8.1 (Berkeley) 6/17/93
  79   inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp
  80 **/
  81
  82 #if !defined(_KERNEL) && !defined(_STANDALONE)
  83 #include  <LibConfig.h>
  84
  85 //#include "port_before.h"
  86
  87 #include <namespace.h>
  88 #include <sys/types.h>
  89 #include <sys/param.h>
  90
  91 #include <netinet/in.h>
  92 #include <arpa/inet.h>
  93
  94 #include <ctype.h>
  95
  96 //#include "port_after.h"
  97
  98 #ifdef __weak_alias
  99   __weak_alias(inet_aton,_inet_aton)
 100 #endif
 101
 102 #else   // NOT (!defined(_KERNEL) && !defined(_STANDALONE))
 103   #include <lib/libkern/libkern.h>
 104   #include <netinet/in.h>
 105 #endif
 106
 107 /*
 108  * Ascii internet address interpretation routine.
 109  * The value returned is in network order.
 110  */
 111 u_int32_t
 112 inet_addr(const char *cp) {
 113   struct in_addr val;
 114
 115   if (inet_aton(cp, &val))
 116     return (val.s_addr);
 117   return (INADDR_NONE);
 118 }
 119
 120 /*
 121  * Check whether "cp" is a valid ascii representation
 122  * of an Internet address and convert to a binary address.
 123  * Returns 1 if the address is valid, 0 if not.
 124  * This replaces inet_addr, the return value from which
 125  * cannot distinguish between failure and a local broadcast address.
 126  */
 127 int
 128 inet_aton(const char *cp, struct in_addr *addr) {
 129   u_int32_t val;
 130   int base, n;
 131   char c;
 132   u_int8_t parts[4];
 133   u_int8_t *pp = parts;
 134   int digit;
 135
 136   c = *cp;
 137   for (;;) {
 138     /*
 139      * Collect number up to ``.''.
 140      * Values are specified as for C:
 141      * 0x=hex, 0=octal, isdigit=decimal.
 142      */
 143     if (!isdigit((unsigned char)c))
 144       return (0);
 145     val = 0; base = 10; digit = 0;
 146     if (c == '0') {
 147       c = *++cp;
 148       if (c == 'x' || c == 'X')
 149         base = 16, c = *++cp;
 150       else {
 151         base = 8;
 152         digit = 1 ;
 153       }
 154     }
 155     for (;;) {
 156       if (isascii(c) && isdigit((unsigned char)c)) {
 157         if (base == 8 && (c == '8' || c == '9'))
 158           return (0);
 159         val = (val * base) + (c - '0');
 160         c = *++cp;
 161         digit = 1;
 162       } else if (base == 16 && isascii(c) &&
 163            isxdigit((unsigned char)c)) {
 164         val = (val << 4) |
 165           (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 166         c = *++cp;
 167         digit = 1;
 168       } else
 169         break;
 170     }
 171     if (c == '.') {
 172       /*
 173        * Internet format:
 174        *  a.b.c.d
 175        *  a.b.c (with c treated as 16 bits)
 176        *  a.b (with b treated as 24 bits)
 177        */
 178       if (pp >= parts + 3 || val > 0xffU)
 179         return (0);
 180       *pp++ = (u_int8_t)val;
 181       c = *++cp;
 182     } else
 183       break;
 184   }
 185   /*
 186    * Check for trailing characters.
 187    */
 188   if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 189     return (0);
 190   /*
 191    * Did we get a valid digit?
 192    */
 193   if (!digit)
 194     return (0);
 195   /*
 196    * Concoct the address according to
 197    * the number of parts specified.
 198    */
 199   n = (int)(pp - parts + 1);
 200   switch (n) {
 201   case 1:       /* a -- 32 bits */
 202     break;
 203
 204   case 2:       /* a.b -- 8.24 bits */
 205     if (val > 0xffffffU)
 206       return (0);
 207     val |= parts[0] << 24;
 208     break;
 209
 210   case 3:       /* a.b.c -- 8.8.16 bits */
 211     if (val > 0xffffU)
 212       return (0);
 213     val |= (parts[0] << 24) | (parts[1] << 16);
 214     break;
 215
 216   case 4:       /* a.b.c.d -- 8.8.8.8 bits */
 217     if (val > 0xffU)
 218       return (0);
 219     val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 220     break;
 221   }
 222   if (addr != NULL)
 223     addr->s_addr = htonl(val);
 224   return (1);
 225 }