common/lib/libc/inet/inet_addr.c

   1 /*      $NetBSD: inet_addr.c,v 1.1 2005/12/20 19:28:51 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 1983, 1990, 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  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
  56 /*
  57  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  58  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  59  *
  60  * Permission to use, copy, modify, and distribute this software for any
  61  * purpose with or without fee is hereby granted, provided that the above
  62  * copyright notice and this permission notice appear in all copies.
  63  *
  64  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  65  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  66  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  67  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  68  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  69  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  70  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  71  */
  72
  73 #if !defined(_KERNEL) && !defined(_STANDALONE)
  74 #include <sys/cdefs.h>
  75 #if defined(LIBC_SCCS) && !defined(lint)
  76 #if 0
  77 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  78 static const char rcsid[] = "Id: inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp";
  79 #else
  80 __RCSID("$NetBSD: inet_addr.c,v 1.1 2005/12/20 19:28:51 christos Exp $");
  81 #endif
  82 #endif /* LIBC_SCCS and not lint */
  83
  84 #include "port_before.h"
  85
  86 #include "namespace.h"
  87 #include <sys/types.h>
  88 #include <sys/param.h>
  89
  90 #include <netinet/in.h>
  91 #include <arpa/inet.h>
  92
  93 #include <ctype.h>
  94
  95 #include "port_after.h"
  96
  97 #ifdef __weak_alias
  98 __weak_alias(inet_aton,_inet_aton)
  99 #endif
 100 #else
 101 #include <lib/libkern/libkern.h>
 102 #include <netinet/in.h>
 103 #endif
 104
 105 /*
 106  * Ascii internet address interpretation routine.
 107  * The value returned is in network order.
 108  */
 109 uint32_t
 110 inet_addr(const char *cp) {
 111         struct in_addr val;
 112
 113         if (inet_aton(cp, &val))
 114                 return (val.s_addr);
 115         return (INADDR_NONE);
 116 }
 117
 118 /*
 119  * Check whether "cp" is a valid ascii representation
 120  * of an Internet address and convert to a binary address.
 121  * Returns 1 if the address is valid, 0 if not.
 122  * This replaces inet_addr, the return value from which
 123  * cannot distinguish between failure and a local broadcast address.
 124  */
 125 int
 126 inet_aton(const char *cp, struct in_addr *addr) {
 127         uint32_t val;
 128         int base, n;
 129         char c;
 130         uint8_t parts[4];
 131         uint8_t *pp = parts;
 132         int digit;
 133
 134         c = *cp;
 135         for (;;) {
 136                 /*
 137                  * Collect number up to ``.''.
 138                  * Values are specified as for C:
 139                  * 0x=hex, 0=octal, isdigit=decimal.
 140                  */
 141                 if (!isdigit((unsigned char)c))
 142                         return (0);
 143                 val = 0; base = 10; digit = 0;
 144                 if (c == '0') {
 145                         c = *++cp;
 146                         if (c == 'x' || c == 'X')
 147                                 base = 16, c = *++cp;
 148                         else {
 149                                 base = 8;
 150                                 digit = 1 ;
 151                         }
 152                 }
 153                 for (;;) {
 154                         if (isascii(c) && isdigit((unsigned char)c)) {
 155                                 if (base == 8 && (c == '8' || c == '9'))
 156                                         return (0);
 157                                 val = (val * base) + (c - '0');
 158                                 c = *++cp;
 159                                 digit = 1;
 160                         } else if (base == 16 && isascii(c) &&
 161                                    isxdigit((unsigned char)c)) {
 162                                 val = (val << 4) |
 163                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 164                                 c = *++cp;
 165                                 digit = 1;
 166                         } else
 167                                 break;
 168                 }
 169                 if (c == '.') {
 170                         /*
 171                          * Internet format:
 172                          *      a.b.c.d
 173                          *      a.b.c   (with c treated as 16 bits)
 174                          *      a.b     (with b treated as 24 bits)
 175                          */
 176                         if (pp >= parts + 3 || val > 0xffU)
 177                                 return (0);
 178                         *pp++ = val;
 179                         c = *++cp;
 180                 } else
 181                         break;
 182         }
 183         /*
 184          * Check for trailing characters.
 185          */
 186         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 187                 return (0);
 188         /*
 189          * Did we get a valid digit?
 190          */
 191         if (!digit)
 192                 return (0);
 193         /*
 194          * Concoct the address according to
 195          * the number of parts specified.
 196          */
 197         n = pp - parts + 1;
 198         switch (n) {
 199         case 1:                         /* a -- 32 bits */
 200                 break;
 201
 202         case 2:                         /* a.b -- 8.24 bits */
 203                 if (val > 0xffffffU)
 204                         return (0);
 205                 val |= parts[0] << 24;
 206                 break;
 207
 208         case 3:                         /* a.b.c -- 8.8.16 bits */
 209                 if (val > 0xffffU)
 210                         return (0);
 211                 val |= (parts[0] << 24) | (parts[1] << 16);
 212                 break;
 213
 214         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 215                 if (val > 0xffU)
 216                         return (0);
 217                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 218                 break;
 219         }
 220         if (addr != NULL)
 221                 addr->s_addr = htonl(val);
 222         return (1);
 223 }