src/system/kernel/util/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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  */
  53
  54 /*
  55  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  56  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  57  *
  58  * Permission to use, copy, modify, and distribute this software for any
  59  * purpose with or without fee is hereby granted, provided that the above
  60  * copyright notice and this permission notice appear in all copies.
  61  *
  62  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  63  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  65  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  66  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  67  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  68  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  69  */
  70
  71 #include <sys/types.h>
  72 #include <sys/param.h>
  73
  74 #include <netinet/in.h>
  75 #include <arpa/inet.h>
  76
  77 #include <ctype.h>
  78
  79 /*%
  80  * Ascii internet address interpretation routine.
  81  * The value returned is in network order.
  82  */
  83 in_addr_t
  84 inet_addr(const char *cp) {
  85         struct in_addr val;
  86
  87         if (inet_aton(cp, &val))
  88                 return (val.s_addr);
  89         return (INADDR_NONE);
  90 }
  91
  92 /*%
  93  * Check whether "cp" is a valid ascii representation
  94  * of an Internet address and convert to a binary address.
  95  * Returns 1 if the address is valid, 0 if not.
  96  * This replaces inet_addr, the return value from which
  97  * cannot distinguish between failure and a local broadcast address.
  98  */
  99 int
 100 inet_aton(const char *cp, struct in_addr *addr) {
 101         u_long val;
 102         int base, n;
 103         char c;
 104         u_int8_t parts[4];
 105         u_int8_t *pp = parts;
 106         int digit;
 107
 108         c = *cp;
 109         for (;;) {
 110                 /*
 111                  * Collect number up to ``.''.
 112                  * Values are specified as for C:
 113                  * 0x=hex, 0=octal, isdigit=decimal.
 114                  */
 115                 if (!isdigit((unsigned char)c))
 116                         return (0);
 117                 val = 0; base = 10; digit = 0;
 118                 if (c == '0') {
 119                         c = *++cp;
 120                         if (c == 'x' || c == 'X')
 121                                 base = 16, c = *++cp;
 122                         else {
 123                                 base = 8;
 124                                 digit = 1 ;
 125                         }
 126                 }
 127                 for (;;) {
 128                         if (isascii(c) && isdigit((unsigned char)c)) {
 129                                 if (base == 8 && (c == '8' || c == '9'))
 130                                         return (0);
 131                                 val = (val * base) + (c - '0');
 132                                 c = *++cp;
 133                                 digit = 1;
 134                         } else if (base == 16 && isascii(c) &&
 135                                    isxdigit((unsigned char)c)) {
 136                                 val = (val << 4) |
 137                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 138                                 c = *++cp;
 139                                 digit = 1;
 140                         } else
 141                                 break;
 142                 }
 143                 if (c == '.') {
 144                         /*
 145                          * Internet format:
 146                          *      a.b.c.d
 147                          *      a.b.c   (with c treated as 16 bits)
 148                          *      a.b     (with b treated as 24 bits)
 149                          */
 150                         if (pp >= parts + 3 || val > 0xffU)
 151                                 return (0);
 152                         *pp++ = val;
 153                         c = *++cp;
 154                 } else
 155                         break;
 156         }
 157         /*
 158          * Check for trailing characters.
 159          */
 160         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 161                 return (0);
 162         /*
 163          * Did we get a valid digit?
 164          */
 165         if (!digit)
 166                 return (0);
 167         /*
 168          * Concoct the address according to
 169          * the number of parts specified.
 170          */
 171         n = pp - parts + 1;
 172         switch (n) {
 173         case 1:                         /*%< a -- 32 bits */
 174                 break;
 175
 176         case 2:                         /*%< a.b -- 8.24 bits */
 177                 if (val > 0xffffffU)
 178                         return (0);
 179                 val |= parts[0] << 24;
 180                 break;
 181
 182         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 183                 if (val > 0xffffU)
 184                         return (0);
 185                 val |= (parts[0] << 24) | (parts[1] << 16);
 186                 break;
 187
 188         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 189                 if (val > 0xffU)
 190                         return (0);
 191                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 192                 break;
 193         }
 194         if (addr != NULL)
 195                 addr->s_addr = htonl(val);
 196         return (1);
 197 }
 198