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 #pragma clang diagnostic push
  68 #pragma clang diagnostic ignored "-Wcomma"
  69
  70 #if defined(LIBC_SCCS) && !defined(lint)
  71 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  72 static const char rcsid[] = "$Id: inet_addr.c,v 1.4.18.1 2005/04/27 05:00:52 sra Exp $";
  73 #endif /* LIBC_SCCS and not lint */
  74
  75 /* the algorithms only can deal with ASCII, so we optimize for it */
  76 #define USE_ASCII
  77
  78 #include <sys/cdefs.h>
  79 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_addr.c,v 1.4 2007/06/03 17:20:26 ume Exp $");
  80
  81 #include "port_before.h"
  82
  83 #include <sys/types.h>
  84 #include <sys/param.h>
  85
  86 #include <netinet/in.h>
  87 #include <arpa/inet.h>
  88
  89 #include <ctype.h>
  90
  91 #include "port_after.h"
  92
  93 /*%
  94  * Ascii internet address interpretation routine.
  95  * The value returned is in network order.
  96  */
  97 in_addr_t               /* XXX should be struct in_addr :( */
  98 inet_addr(const char *cp) {
  99         struct in_addr val;
 100
 101         if (inet_aton(cp, &val))
 102                 return (val.s_addr);
 103         return (INADDR_NONE);
 104 }
 105
 106 /*%
 107  * Check whether "cp" is a valid ascii representation
 108  * of an Internet address and convert to a binary address.
 109  * Returns 1 if the address is valid, 0 if not.
 110  * This replaces inet_addr, the return value from which
 111  * cannot distinguish between failure and a local broadcast address.
 112  * strict == 1 disallows trailing characters.
 113  */
 114 int
 115 _inet_aton_check(const char *cp, struct in_addr *addr, int strict)
 116 {
 117         u_long val;
 118         int base, n;
 119         char c;
 120         u_int8_t parts[4];
 121         u_int8_t *pp = parts;
 122         int digit;
 123
 124         c = *cp;
 125         for (;;) {
 126                 /*
 127                  * Collect number up to ``.''.
 128                  * Values are specified as for C:
 129                  * 0x=hex, 0=octal, isdigit=decimal.
 130                  */
 131                 if (!isdigit((unsigned char)c))
 132                         return (0);
 133                 val = 0; base = 10; digit = 0;
 134                 if (c == '0') {
 135                         c = *++cp;
 136                         if (c == 'x' || c == 'X')
 137                                 base = 16, c = *++cp;
 138                         else {
 139                                 base = 8;
 140                                 digit = 1 ;
 141                         }
 142                 }
 143                 for (;;) {
 144                         if (isascii(c) && isdigit((unsigned char)c)) {
 145                                 if (base == 8 && (c == '8' || c == '9'))
 146                                         return (0);
 147                                 val = (val * base) + (c - '0');
 148                                 c = *++cp;
 149                                 digit = 1;
 150                         } else if (base == 16 && isascii(c) &&
 151                                    isxdigit((unsigned char)c)) {
 152                                 val = (val << 4) |
 153                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 154                                 c = *++cp;
 155                                 digit = 1;
 156                         } else
 157                                 break;
 158                 }
 159                 if (c == '.') {
 160                         /*
 161                          * Internet format:
 162                          *      a.b.c.d
 163                          *      a.b.c   (with c treated as 16 bits)
 164                          *      a.b     (with b treated as 24 bits)
 165                          */
 166                         if (pp >= parts + 3 || val > 0xffU)
 167                                 return (0);
 168                         *pp++ = val;
 169                         c = *++cp;
 170                 } else
 171                         break;
 172         }
 173         /*
 174          * Check for trailing characters.
 175          */
 176         if (c != '\0') {
 177                 if (strict) return (0);
 178                 if (!isascii(c) || !isspace(c)) return (0);
 179         }
 180         /*
 181          * Did we get a valid digit?
 182          */
 183         if (!digit)
 184                 return (0);
 185         /*
 186          * Concoct the address according to
 187          * the number of parts specified.
 188          */
 189         n = pp - parts + 1;
 190         switch (n) {
 191         case 1:                         /*%< a -- 32 bits */
 192                 break;
 193
 194         case 2:                         /*%< a.b -- 8.24 bits */
 195                 if (val > 0xffffffU)
 196                         return (0);
 197                 val |= parts[0] << 24;
 198                 break;
 199
 200         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 201                 if (val > 0xffffU)
 202                         return (0);
 203                 val |= (parts[0] << 24) | (parts[1] << 16);
 204                 break;
 205
 206         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 207                 if (val > 0xffU)
 208                         return (0);
 209                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 210                 break;
 211         }
 212         if (addr != NULL)
 213                 addr->s_addr = htonl(val);
 214         return (1);
 215 }
 216
 217 int
 218 inet_aton(const char *cp, struct in_addr *addr)
 219 {
 220         return _inet_aton_check(cp, addr, 0);
 221 }
 222
 223 /*
 224  * Weak aliases for applications that use certain private entry points,
 225  * and fail to include <arpa/inet.h>.
 226  */
 227 #undef inet_addr
 228 __weak_reference(__inet_addr, inet_addr);
 229 #undef inet_aton
 230 __weak_reference(__inet_aton, inet_aton);
 231
 232 #pragma clang diagnostic pop
 233 /*! \file */