usr/src/cmd/ipf/lib/common/inet_addr.c

   1 /*
   2  * ++Copyright++ 1983, 1990, 1993
   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  * 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  * --Copyright--
  54  */
  55
  56 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  57 static const char rcsid[] = "@(#)$Id: inet_addr.c,v 1.8.2.3 2004/12/09 19:41:20 darrenr Exp $";
  58
  59 #include <sys/param.h>
  60 #include <netinet/in.h>
  61 #include <arpa/inet.h>
  62 #include <ctype.h>
  63
  64 #ifndef __P
  65 # ifdef __STDC__
  66 #  define       __P(x)  x
  67 # else
  68 #  define       __P(x)  ()
  69 # endif
  70 #endif
  71 #ifndef linux
  72 int inet_aton __P((const char *, struct in_addr *));
  73
  74 /*
  75  * Because the ctype(3) posix definition, if used "safely" in code everywhere,
  76  * would mean all normal code that walks through strings needed casts.  Yuck.
  77  */
  78 #define ISALNUM(x)      isalnum((u_char)(x))
  79 #define ISALPHA(x)      isalpha((u_char)(x))
  80 #define ISASCII(x)      isascii((u_char)(x))
  81 #define ISDIGIT(x)      isdigit((u_char)(x))
  82 #define ISPRINT(x)      isprint((u_char)(x))
  83 #define ISSPACE(x)      isspace((u_char)(x))
  84 #define ISUPPER(x)      isupper((u_char)(x))
  85 #define ISXDIGIT(x)     isxdigit((u_char)(x))
  86 #define ISLOWER(x)      islower((u_char)(x))
  87
  88 /*
  89  * Check whether "cp" is a valid ascii representation
  90  * of an Internet address and convert to a binary address.
  91  * Returns 1 if the address is valid, 0 if not.
  92  * This replaces inet_addr, the return value from which
  93  * cannot distinguish between failure and a local broadcast address.
  94  */
  95 int
  96 inet_aton(cp, addr)
  97         register const char *cp;
  98         struct in_addr *addr;
  99 {
 100         register u_long val;
 101         register int base, n;
 102         register char c;
 103         u_int parts[4];
 104         register u_int *pp = parts;
 105
 106         c = *cp;
 107         for (;;) {
 108                 /*
 109                  * Collect number up to ``.''.
 110                  * Values are specified as for C:
 111                  * 0x=hex, 0=octal, isdigit=decimal.
 112                  */
 113                 if (!ISDIGIT(c))
 114                         return (0);
 115                 val = 0; base = 10;
 116                 if (c == '0') {
 117                         c = *++cp;
 118                         if (c == 'x' || c == 'X')
 119                                 base = 16, c = *++cp;
 120                         else
 121                                 base = 8;
 122                 }
 123                 for (;;) {
 124                         if (ISASCII(c) && ISDIGIT(c)) {
 125                                 val = (val * base) + (c - '0');
 126                                 c = *++cp;
 127                         } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) {
 128                                 val = (val << 4) |
 129                                         (c + 10 - (ISLOWER(c) ? 'a' : 'A'));
 130                                 c = *++cp;
 131                         } else
 132                                 break;
 133                 }
 134                 if (c == '.') {
 135                         /*
 136                          * Internet format:
 137                          *      a.b.c.d
 138                          *      a.b.c   (with c treated as 16 bits)
 139                          *      a.b     (with b treated as 24 bits)
 140                          */
 141                         if (pp >= parts + 3)
 142                                 return (0);
 143                         *pp++ = val;
 144                         c = *++cp;
 145                 } else
 146                         break;
 147         }
 148         /*
 149          * Check for trailing characters.
 150          */
 151         if (c != '\0' && (!ISASCII(c) || !ISSPACE(c)))
 152                 return (0);
 153         /*
 154          * Concoct the address according to
 155          * the number of parts specified.
 156          */
 157         n = pp - parts + 1;
 158         switch (n) {
 159
 160         case 0:
 161                 return (0);             /* initial nondigit */
 162
 163         case 1:                         /* a -- 32 bits */
 164                 break;
 165
 166         case 2:                         /* a.b -- 8.24 bits */
 167                 if (val > 0xffffff)
 168                         return (0);
 169                 val |= parts[0] << 24;
 170                 break;
 171
 172         case 3:                         /* a.b.c -- 8.8.16 bits */
 173                 if (val > 0xffff)
 174                         return (0);
 175                 val |= (parts[0] << 24) | (parts[1] << 16);
 176                 break;
 177
 178         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 179                 if (val > 0xff)
 180                         return (0);
 181                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 182                 break;
 183         }
 184         if (addr)
 185                 addr->s_addr = htonl(val);
 186         return (1);
 187 }
 188 #endif
 189
 190 /* these are compatibility routines, not needed on recent BSD releases */
 191
 192 /*
 193  * Ascii internet address interpretation routine.
 194  * The value returned is in network order.
 195  */
 196 #if 0
 197 inet_addr(cp)
 198         const char *cp;
 199 {
 200         struct in_addr val;
 201
 202         if (inet_aton(cp, &val))
 203                 return (val.s_addr);
 204         return (0xffffffff);
 205 }
 206 #endif