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 $";
  70 #endif /* LIBC_SCCS and not lint */
  71
  72 /* the algorithms only can deal with ASCII, so we optimize for it */
  73 #define USE_ASCII
  74
  75 #include <sys/cdefs.h>
  76 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_addr.c,v 1.4 2007/06/03 17:20:26 ume Exp $");
  77
  78 #include "port_before.h"
  79
  80 #include <sys/types.h>
  81 #include <sys/param.h>
  82
  83 #include <netinet/in.h>
  84 #include <arpa/inet.h>
  85
  86 #include <ctype.h>
  87
  88 #include "port_after.h"
  89
  90 /*%
  91  * Ascii internet address interpretation routine.
  92  * The value returned is in network order.
  93  */
  94 in_addr_t               /* XXX should be struct in_addr :( */
  95 inet_addr(const char *cp) {
  96         struct in_addr val;
  97
  98         if (inet_aton(cp, &val))
  99                 return (val.s_addr);
 100         return (INADDR_NONE);
 101 }
 102
 103 /*%
 104  * Check whether "cp" is a valid ascii representation
 105  * of an Internet address and convert to a binary address.
 106  * Returns 1 if the address is valid, 0 if not.
 107  * This replaces inet_addr, the return value from which
 108  * cannot distinguish between failure and a local broadcast address.
 109  * strict == 1 disallows trailing characters.
 110  */
 111 int
 112 _inet_aton_check(const char *cp, struct in_addr *addr, int strict)
 113 {
 114         u_long val;
 115         int base, n;
 116         char c;
 117         u_int8_t parts[4];
 118         u_int8_t *pp = parts;
 119         int digit;
 120
 121         c = *cp;
 122         for (;;) {
 123                 /*
 124                  * Collect number up to ``.''.
 125                  * Values are specified as for C:
 126                  * 0x=hex, 0=octal, isdigit=decimal.
 127                  */
 128                 if (!isdigit((unsigned char)c))
 129                         return (0);
 130                 val = 0; base = 10; digit = 0;
 131                 if (c == '0') {
 132                         c = *++cp;
 133                         if (c == 'x' || c == 'X')
 134                                 base = 16, c = *++cp;
 135                         else {
 136                                 base = 8;
 137                                 digit = 1 ;
 138                         }
 139                 }
 140                 for (;;) {
 141                         if (isascii(c) && isdigit((unsigned char)c)) {
 142                                 if (base == 8 && (c == '8' || c == '9'))
 143                                         return (0);
 144                                 val = (val * base) + (c - '0');
 145                                 c = *++cp;
 146                                 digit = 1;
 147                         } else if (base == 16 && isascii(c) &&
 148                                    isxdigit((unsigned char)c)) {
 149                                 val = (val << 4) |
 150                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 151                                 c = *++cp;
 152                                 digit = 1;
 153                         } else
 154                                 break;
 155                 }
 156                 if (c == '.') {
 157                         /*
 158                          * Internet format:
 159                          *      a.b.c.d
 160                          *      a.b.c   (with c treated as 16 bits)
 161                          *      a.b     (with b treated as 24 bits)
 162                          */
 163                         if (pp >= parts + 3 || val > 0xffU)
 164                                 return (0);
 165                         *pp++ = val;
 166                         c = *++cp;
 167                 } else
 168                         break;
 169         }
 170         /*
 171          * Check for trailing characters.
 172          */
 173         if (c != '\0') {
 174                 if (strict) return (0);
 175                 if (!isascii(c) || !isspace(c)) return (0);
 176         }
 177         /*
 178          * Did we get a valid digit?
 179          */
 180         if (!digit)
 181                 return (0);
 182         /*
 183          * Concoct the address according to
 184          * the number of parts specified.
 185          */
 186         n = pp - parts + 1;
 187         switch (n) {
 188         case 1:                         /*%< a -- 32 bits */
 189                 break;
 190
 191         case 2:                         /*%< a.b -- 8.24 bits */
 192                 if (val > 0xffffffU)
 193                         return (0);
 194                 val |= parts[0] << 24;
 195                 break;
 196
 197         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 198                 if (val > 0xffffU)
 199                         return (0);
 200                 val |= (parts[0] << 24) | (parts[1] << 16);
 201                 break;
 202
 203         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 204                 if (val > 0xffU)
 205                         return (0);
 206                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 207                 break;
 208         }
 209         if (addr != NULL)
 210                 addr->s_addr = htonl(val);
 211         return (1);
 212 }
 213
 214 int
 215 inet_aton(const char *cp, struct in_addr *addr)
 216 {
 217         return _inet_aton_check(cp, addr, 0);
 218 }
 219
 220 /*
 221  * Weak aliases for applications that use certain private entry points,
 222  * and fail to include <arpa/inet.h>.
 223  */
 224 #undef inet_addr
 225 __weak_reference(__inet_addr, inet_addr);
 226 #undef inet_aton
 227 __weak_reference(__inet_aton, inet_aton);
 228
 229 /*! \file */