inet/inet_net.c

   1 /*
   2  * Copyright (c) 1983, 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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)inet_network.c      8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include <sys/types.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #include <ctype.h>
  38
  39 /*
  40  * Internet network address interpretation routine.
  41  * The library routines call this routine to interpret
  42  * network numbers.
  43  */
  44 u_int32_t
  45 inet_network(cp)
  46         register const char *cp;
  47 {
  48         register u_int32_t val, base, n, i;
  49         register char c;
  50         u_int32_t parts[4], *pp = parts;
  51         int digit;
  52
  53 again:
  54         val = 0; base = 10; digit = 0;
  55         if (*cp == '0')
  56                 digit = 1, base = 8, cp++;
  57         if (*cp == 'x' || *cp == 'X')
  58                 base = 16, cp++;
  59         while ((c = *cp) != 0) {
  60                 if (isdigit(c)) {
  61                         if (base == 8 && (c == '8' || c == '9'))
  62                                 return (INADDR_NONE);
  63                         val = (val * base) + (c - '0');
  64                         cp++;
  65                         digit = 1;
  66                         continue;
  67                 }
  68                 if (base == 16 && isxdigit(c)) {
  69                         val = (val << 4) + (tolower (c) + 10 - 'a');
  70                         cp++;
  71                         digit = 1;
  72                         continue;
  73                 }
  74                 break;
  75         }
  76         if (!digit)
  77                 return (INADDR_NONE);
  78         if (pp >= parts + 4 || val > 0xff)
  79                 return (INADDR_NONE);
  80         if (*cp == '.') {
  81                 *pp++ = val, cp++;
  82                 goto again;
  83         }
  84         if (*cp && !isspace(*cp))
  85                 return (INADDR_NONE);
  86         if (pp >= parts + 4 || val > 0xff)
  87                 return (INADDR_NONE);
  88         *pp++ = val;
  89         n = pp - parts;
  90         for (val = 0, i = 0; i < n; i++) {
  91                 val <<= 8;
  92                 val |= parts[i] & 0xff;
  93         }
  94         return (val);
  95 }