openbsd-compat/inet_aton.c

   1 /*      $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie Exp $     */
   2
   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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  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  * --Copyright--
  50  */
  51
  52 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
  53
  54 #include "includes.h"
  55
  56 #if !defined(HAVE_INET_ATON)
  57
  58 #include <sys/types.h>
  59 #include <sys/param.h>
  60 #include <netinet/in.h>
  61 #include <arpa/inet.h>
  62 #include <ctype.h>
  63
  64 #if 0
  65 /*
  66  * Ascii internet address interpretation routine.
  67  * The value returned is in network order.
  68  */
  69 in_addr_t
  70 inet_addr(const char *cp)
  71 {
  72         struct in_addr val;
  73
  74         if (inet_aton(cp, &val))
  75                 return (val.s_addr);
  76         return (INADDR_NONE);
  77 }
  78 #endif
  79
  80 /*
  81  * Check whether "cp" is a valid ascii representation
  82  * of an Internet address and convert to a binary address.
  83  * Returns 1 if the address is valid, 0 if not.
  84  * This replaces inet_addr, the return value from which
  85  * cannot distinguish between failure and a local broadcast address.
  86  */
  87 int
  88 inet_aton(const char *cp, struct in_addr *addr)
  89 {
  90         u_int32_t val;
  91         int base, n;
  92         char c;
  93         u_int parts[4];
  94         u_int *pp = parts;
  95
  96         c = *cp;
  97         for (;;) {
  98                 /*
  99                  * Collect number up to ``.''.
 100                  * Values are specified as for C:
 101                  * 0x=hex, 0=octal, isdigit=decimal.
 102                  */
 103                 if (!isdigit(c))
 104                         return (0);
 105                 val = 0; base = 10;
 106                 if (c == '0') {
 107                         c = *++cp;
 108                         if (c == 'x' || c == 'X')
 109                                 base = 16, c = *++cp;
 110                         else
 111                                 base = 8;
 112                 }
 113                 for (;;) {
 114                         if (isascii(c) && isdigit(c)) {
 115                                 val = (val * base) + (c - '0');
 116                                 c = *++cp;
 117                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 118                                 val = (val << 4) |
 119                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 120                                 c = *++cp;
 121                         } else
 122                                 break;
 123                 }
 124                 if (c == '.') {
 125                         /*
 126                          * Internet format:
 127                          *      a.b.c.d
 128                          *      a.b.c   (with c treated as 16 bits)
 129                          *      a.b     (with b treated as 24 bits)
 130                          */
 131                         if (pp >= parts + 3)
 132                                 return (0);
 133                         *pp++ = val;
 134                         c = *++cp;
 135                 } else
 136                         break;
 137         }
 138         /*
 139          * Check for trailing characters.
 140          */
 141         if (c != '\0' && (!isascii(c) || !isspace(c)))
 142                 return (0);
 143         /*
 144          * Concoct the address according to
 145          * the number of parts specified.
 146          */
 147         n = pp - parts + 1;
 148         switch (n) {
 149
 150         case 0:
 151                 return (0);             /* initial nondigit */
 152
 153         case 1:                         /* a -- 32 bits */
 154                 break;
 155
 156         case 2:                         /* a.b -- 8.24 bits */
 157                 if ((val > 0xffffff) || (parts[0] > 0xff))
 158                         return (0);
 159                 val |= parts[0] << 24;
 160                 break;
 161
 162         case 3:                         /* a.b.c -- 8.8.16 bits */
 163                 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
 164                         return (0);
 165                 val |= (parts[0] << 24) | (parts[1] << 16);
 166                 break;
 167
 168         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 169                 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
 170                         return (0);
 171                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 172                 break;
 173         }
 174         if (addr)
 175                 addr->s_addr = htonl(val);
 176         return (1);
 177 }
 178
 179 #endif /* !defined(HAVE_INET_ATON) */