net/FreeBSD/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  * 4. 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
  67 #if defined(LIBC_SCCS) && !defined(lint)
  68 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  69 static const char rcsid[] = "$Id: inet_addr.c,v 1.4.18.1 2005/04/27 05:00:52 sra Exp $";
  70 #endif /* LIBC_SCCS and not lint */
  71 #include <sys/cdefs.h>
  72 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_addr.c,v 1.4 2007/06/03 17:20:26 ume Exp $");
  73
  74 #include "port_before.h"
  75
  76 #include <sys/types.h>
  77 #include <sys/param.h>
  78
  79 #include <netinet/in.h>
  80 #include <arpa/inet.h>
  81
  82 #include <ctype.h>
  83
  84 #include "port_after.h"
  85
  86 /*%
  87  * Ascii internet address interpretation routine.
  88  * The value returned is in network order.
  89  */
  90 in_addr_t               /* XXX should be struct in_addr :( */
  91 inet_addr(const char *cp) {
  92         struct in_addr val;
  93
  94         if (inet_aton(cp, &val))
  95                 return (val.s_addr);
  96         return (INADDR_NONE);
  97 }
  98
  99 /*%
 100  * Check whether "cp" is a valid ascii representation
 101  * of an Internet address and convert to a binary address.
 102  * Returns 1 if the address is valid, 0 if not.
 103  * This replaces inet_addr, the return value from which
 104  * cannot distinguish between failure and a local broadcast address.
 105  */
 106 int
 107 inet_aton(const char *cp, struct in_addr *addr) {
 108         u_long val;
 109         int base, n;
 110         char c;
 111         u_int8_t parts[4];
 112         u_int8_t *pp = parts;
 113         int digit;
 114
 115         c = *cp;
 116         for (;;) {
 117                 /*
 118                  * Collect number up to ``.''.
 119                  * Values are specified as for C:
 120                  * 0x=hex, 0=octal, isdigit=decimal.
 121                  */
 122                 if (!isdigit((unsigned char)c))
 123                         return (0);
 124                 val = 0; base = 10; digit = 0;
 125                 if (c == '0') {
 126                         c = *++cp;
 127                         if (c == 'x' || c == 'X')
 128                                 base = 16, c = *++cp;
 129                         else {
 130                                 base = 8;
 131                                 digit = 1 ;
 132                         }
 133                 }
 134                 for (;;) {
 135                         if (isascii(c) && isdigit((unsigned char)c)) {
 136                                 if (base == 8 && (c == '8' || c == '9'))
 137                                         return (0);
 138                                 val = (val * base) + (c - '0');
 139                                 c = *++cp;
 140                                 digit = 1;
 141                         } else if (base == 16 && isascii(c) &&
 142                                    isxdigit((unsigned char)c)) {
 143                                 val = (val << 4) |
 144                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 145                                 c = *++cp;
 146                                 digit = 1;
 147                         } else
 148                                 break;
 149                 }
 150                 if (c == '.') {
 151                         /*
 152                          * Internet format:
 153                          *      a.b.c.d
 154                          *      a.b.c   (with c treated as 16 bits)
 155                          *      a.b     (with b treated as 24 bits)
 156                          */
 157                         if (pp >= parts + 3 || val > 0xffU)
 158                                 return (0);
 159                         *pp++ = val;
 160                         c = *++cp;
 161                 } else
 162                         break;
 163         }
 164         /*
 165          * Check for trailing characters.
 166          */
 167         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 168                 return (0);
 169         /*
 170          * Did we get a valid digit?
 171          */
 172         if (!digit)
 173                 return (0);
 174         /*
 175          * Concoct the address according to
 176          * the number of parts specified.
 177          */
 178         n = pp - parts + 1;
 179         switch (n) {
 180         case 1:                         /*%< a -- 32 bits */
 181                 break;
 182
 183         case 2:                         /*%< a.b -- 8.24 bits */
 184                 if (val > 0xffffffU)
 185                         return (0);
 186                 val |= parts[0] << 24;
 187                 break;
 188
 189         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 190                 if (val > 0xffffU)
 191                         return (0);
 192                 val |= (parts[0] << 24) | (parts[1] << 16);
 193                 break;
 194
 195         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 196                 if (val > 0xffU)
 197                         return (0);
 198                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 199                 break;
 200         }
 201         if (addr != NULL)
 202                 addr->s_addr = htonl(val);
 203         return (1);
 204 }
 205
 206 /*
 207  * Weak aliases for applications that use certain private entry points,
 208  * and fail to include <arpa/inet.h>.
 209  */
 210 #undef inet_addr
 211 __weak_reference(__inet_addr, inet_addr);
 212 #undef inet_aton
 213 __weak_reference(__inet_aton, inet_aton);
 214
 215 /*! \file */