dist/ipf/lib/inet_addr.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * ++Copyright++ 1983, 1990, 1993
   5  * -
   6  * Copyright (c) 1983, 1990, 1993
   7  *    The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  * -
  37  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  38  *
  39  * Permission to use, copy, modify, and distribute this software for any
  40  * purpose with or without fee is hereby granted, provided that the above
  41  * copyright notice and this permission notice appear in all copies, and that
  42  * the name of Digital Equipment Corporation not be used in advertising or
  43  * publicity pertaining to distribution of the document or software without
  44  * specific, written prior permission.
  45  *
  46  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  47  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  48  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  49  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  50  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  51  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  52  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  53  * SOFTWARE.
  54  * -
  55  * --Copyright--
  56  */
  57
  58 #if !defined(lint)
  59 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  60 static const char rcsid[] = "@(#)Id: inet_addr.c,v 1.8.2.3 2004/12/09 19:41:20 darrenr Exp";
  61 #endif /* LIBC_SCCS and not lint */
  62
  63 #include <sys/param.h>
  64 #include <netinet/in.h>
  65 #include <arpa/inet.h>
  66 #include <ctype.h>
  67
  68 #ifndef __P
  69 # ifdef __STDC__
  70 #  define       __P(x)  x
  71 # else
  72 #  define       __P(x)  ()
  73 # endif
  74 #endif
  75 #ifndef linux
  76 int inet_aton __P((const char *, struct in_addr *));
  77
  78 /*
  79  * Because the ctype(3) posix definition, if used "safely" in code everywhere,
  80  * would mean all normal code that walks through strings needed casts.  Yuck.
  81  */
  82 #define ISALNUM(x)      isalnum((u_char)(x))
  83 #define ISALPHA(x)      isalpha((u_char)(x))
  84 #define ISASCII(x)      isascii((u_char)(x))
  85 #define ISDIGIT(x)      isdigit((u_char)(x))
  86 #define ISPRINT(x)      isprint((u_char)(x))
  87 #define ISSPACE(x)      isspace((u_char)(x))
  88 #define ISUPPER(x)      isupper((u_char)(x))
  89 #define ISXDIGIT(x)     isxdigit((u_char)(x))
  90 #define ISLOWER(x)      islower((u_char)(x))
  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(cp, addr)
 101         register const char *cp;
 102         struct in_addr *addr;
 103 {
 104         register u_long val;
 105         register int base, n;
 106         register char c;
 107         u_int parts[4];
 108         register u_int *pp = parts;
 109
 110         c = *cp;
 111         for (;;) {
 112                 /*
 113                  * Collect number up to ``.''.
 114                  * Values are specified as for C:
 115                  * 0x=hex, 0=octal, isdigit=decimal.
 116                  */
 117                 if (!ISDIGIT(c))
 118                         return (0);
 119                 val = 0; base = 10;
 120                 if (c == '0') {
 121                         c = *++cp;
 122                         if (c == 'x' || c == 'X')
 123                                 base = 16, c = *++cp;
 124                         else
 125                                 base = 8;
 126                 }
 127                 for (;;) {
 128                         if (ISASCII(c) && ISDIGIT(c)) {
 129                                 val = (val * base) + (c - '0');
 130                                 c = *++cp;
 131                         } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) {
 132                                 val = (val << 4) |
 133                                         (c + 10 - (ISLOWER(c) ? 'a' : 'A'));
 134                                 c = *++cp;
 135                         } else
 136                                 break;
 137                 }
 138                 if (c == '.') {
 139                         /*
 140                          * Internet format:
 141                          *      a.b.c.d
 142                          *      a.b.c   (with c treated as 16 bits)
 143                          *      a.b     (with b treated as 24 bits)
 144                          */
 145                         if (pp >= parts + 3)
 146                                 return (0);
 147                         *pp++ = val;
 148                         c = *++cp;
 149                 } else
 150                         break;
 151         }
 152         /*
 153          * Check for trailing characters.
 154          */
 155         if (c != '\0' && (!ISASCII(c) || !ISSPACE(c)))
 156                 return (0);
 157         /*
 158          * Concoct the address according to
 159          * the number of parts specified.
 160          */
 161         n = pp - parts + 1;
 162         switch (n) {
 163
 164         case 0:
 165                 return (0);             /* initial nondigit */
 166
 167         case 1:                         /* a -- 32 bits */
 168                 break;
 169
 170         case 2:                         /* a.b -- 8.24 bits */
 171                 if (val > 0xffffff)
 172                         return (0);
 173                 val |= parts[0] << 24;
 174                 break;
 175
 176         case 3:                         /* a.b.c -- 8.8.16 bits */
 177                 if (val > 0xffff)
 178                         return (0);
 179                 val |= (parts[0] << 24) | (parts[1] << 16);
 180                 break;
 181
 182         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 183                 if (val > 0xff)
 184                         return (0);
 185                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 186                 break;
 187         }
 188         if (addr)
 189                 addr->s_addr = htonl(val);
 190         return (1);
 191 }
 192 #endif
 193
 194 /* these are compatibility routines, not needed on recent BSD releases */
 195
 196 /*
 197  * Ascii internet address interpretation routine.
 198  * The value returned is in network order.
 199  */
 200 #if 0
 201 inet_addr(cp)
 202         const char *cp;
 203 {
 204         struct in_addr val;
 205
 206         if (inet_aton(cp, &val))
 207                 return (val.s_addr);
 208         return (0xffffffff);
 209 }
 210 #endif