net/inet_network.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/types.h>
  60 #include <netinet/in.h>
  61 #include <arpa/inet.h>
  62 #include <ctype.h>
  63
  64 /*
  65  * Internet network address interpretation routine.
  66  * The library routines call this routine to interpret
  67  * network numbers.
  68  */
  69 u_long
  70 inet_network(cp)
  71         register const char *cp;
  72 {
  73         register u_long val, base, n;
  74         register char c;
  75         u_long parts[4], *pp = parts;
  76         register int i;
  77
  78 again:
  79         val = 0; base = 10;
  80         if (*cp == '0')
  81                 base = 8, cp++;
  82         if (*cp == 'x' || *cp == 'X')
  83                 base = 16, cp++;
  84         while (c = *cp) {
  85                 if (isdigit(c)) {
  86                         val = (val * base) + (c - '0');
  87                         cp++;
  88                         continue;
  89                 }
  90                 if (base == 16 && isxdigit(c)) {
  91                         val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  92                         cp++;
  93                         continue;
  94                 }
  95                 break;
  96         }
  97         if (*cp == '.') {
  98                 if (pp >= parts + 4)
  99                         return (INADDR_NONE);
 100                 *pp++ = val, cp++;
 101                 goto again;
 102         }
 103         if (*cp && !isspace(*cp))
 104                 return (INADDR_NONE);
 105         *pp++ = val;
 106         n = pp - parts;
 107         if (n > 4)
 108                 return (INADDR_NONE);
 109         for (val = 0, i = 0; i < n; i++) {
 110                 val <<= 8;
 111                 val |= parts[i] & 0xff;
 112         }
 113         return (val);
 114 }