external/bsd/dhcp/dist/omapip/inet_addr.c

   1 /*      $NetBSD: inet_addr.c,v 1.1.1.3 2014/07/12 11:57:58 spz Exp $    */
   2 /*      NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp   */
   3
   4 /*
   5  * Copyright (c) 1983, 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __RCSID("$NetBSD: inet_addr.c,v 1.1.1.3 2014/07/12 11:57:58 spz Exp $");
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  39 #else
  40 static char rcsid[] = "NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp ";
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include "dhcpd.h"
  45
  46 #include "omapip/omapip_p.h"
  47
  48 #ifdef NEED_INET_ATON
  49 /*
  50  * Check whether "cp" is a valid ascii representation
  51  * of an Internet address and convert to a binary address.
  52  * Returns 1 if the address is valid, 0 if not.
  53  * This replaces inet_addr, the return value from which
  54  * cannot distinguish between failure and a local broadcast address.
  55  */
  56 int
  57 inet_aton(cp, addr)
  58         const char *cp;
  59         struct in_addr *addr;
  60 {
  61         register u_long val;
  62         register int base, n;
  63         register char c;
  64         u_int parts[4];
  65         register u_int *pp = parts;
  66
  67         for (;;) {
  68                 /*
  69                  * Collect number up to ``.''.
  70                  * Values are specified as for C:
  71                  * 0x=hex, 0=octal, other=decimal.
  72                  */
  73                 val = 0; base = 10;
  74                 if (*cp == '0') {
  75                         if (*++cp == 'x' || *cp == 'X')
  76                                 base = 16, cp++;
  77                         else
  78                                 base = 8;
  79                 }
  80                 while ((c = *cp) != '\0') {
  81                         if (isascii(c) && isdigit((int)c)) {
  82                                 val = (val * base) + (c - '0');
  83                                 cp++;
  84                                 continue;
  85                         }
  86                         if (base == 16 && isascii(c) && isxdigit((int)c)) {
  87                                 val = (val << 4) +
  88                                       (c + 10 - (islower((int)c) ? 'a' : 'A'));
  89                                 cp++;
  90                                 continue;
  91                         }
  92                         break;
  93                 }
  94                 if (*cp == '.') {
  95                         /*
  96                          * Internet format:
  97                          *      a.b.c.d
  98                          *      a.b.c   (with c treated as 16-bits)
  99                          *      a.b     (with b treated as 24 bits)
 100                          */
 101                         if (pp >= parts + 3 || val > 0xff)
 102                                 return (0);
 103                         *pp++ = val, cp++;
 104                 } else
 105                         break;
 106         }
 107         /*
 108          * Check for trailing characters.
 109          */
 110         if (*cp && (!isascii(*cp) || !isspace((int)*cp)))
 111                 return (0);
 112         /*
 113          * Concoct the address according to
 114          * the number of parts specified.
 115          */
 116         n = pp - parts + 1;
 117         switch (n) {
 118
 119         case 0:
 120                 return (0);             /* initial nondigit */
 121
 122         case 1:                         /* a -- 32 bits */
 123                 break;
 124
 125         case 2:                         /* a.b -- 8.24 bits */
 126                 if (val > 0xffffff)
 127                         return (0);
 128                 val |= parts[0] << 24;
 129                 break;
 130
 131         case 3:                         /* a.b.c -- 8.8.16 bits */
 132                 if (val > 0xffff)
 133                         return (0);
 134                 val |= (parts[0] << 24) | (parts[1] << 16);
 135                 break;
 136
 137         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 138                 if (val > 0xff)
 139                         return (0);
 140                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 141                 break;
 142         }
 143         if (addr)
 144                 addr->s_addr = htonl(val);
 145         return (1);
 146 }
 147 #endif