StdLib/LibC/NetUtil/inet_network.c

   1 /** @File
   2   Internet network address interpretation routine.
   3
   4   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13  * Copyright (c) 1983, 1993
  14  *  The Regents of the University of California.  All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39
  40   NetBSD: inet_network.c,v 1.1 2004/05/20 23:13:02 christos Exp
  41   inet_network.c  8.1 (Berkeley) 6/4/93
  42 **/
  43 #include  <LibConfig.h>
  44
  45 #include "namespace.h"
  46 #include <sys/types.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49
  50 #include <assert.h>
  51 #include <ctype.h>
  52 #ifdef _DIAGNOSTIC
  53 #include <stddef.h> /* for NULL */
  54 #endif
  55
  56 #ifdef __weak_alias
  57 __weak_alias(inet_network,_inet_network)
  58 #endif
  59
  60 /*
  61  * Internet network address interpretation routine.
  62  * The library routines call this routine to interpret
  63  * network numbers.
  64  */
  65 in_addr_t
  66 inet_network(const char *cp)
  67 {
  68   in_addr_t val;
  69   size_t i, n;
  70   u_char c;
  71   in_addr_t parts[4], *pp = parts;
  72   int digit, base;
  73
  74   _DIAGASSERT(cp != NULL);
  75
  76 again:
  77   val = 0; base = 10; digit = 0;
  78   if (*cp == '0')
  79     digit = 1, base = 8, cp++;
  80   if (*cp == 'x' || *cp == 'X')
  81     base = 16, cp++;
  82   while ((c = *cp) != 0) {
  83     if (isdigit(c)) {
  84       if (base == 8 && (c == '8' || c == '9'))
  85         return (INADDR_NONE);
  86       val = (val * base) + (c - '0');
  87       cp++;
  88       digit = 1;
  89       continue;
  90     }
  91     if (base == 16 && isxdigit(c)) {
  92       val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  93       cp++;
  94       digit = 1;
  95       continue;
  96     }
  97     break;
  98   }
  99   if (!digit)
 100     return (INADDR_NONE);
 101   if (*cp == '.') {
 102     if (pp >= parts + 4 || val > 0xff)
 103       return (INADDR_NONE);
 104     *pp++ = val, cp++;
 105     goto again;
 106   }
 107   if (*cp && !isspace((u_char) *cp))
 108     return (INADDR_NONE);
 109   if (pp >= parts + 4 || val > 0xff)
 110     return (INADDR_NONE);
 111   *pp++ = val;
 112   n = pp - parts;
 113   if (n > 4)
 114     return (INADDR_NONE);
 115   for (val = 0, i = 0; i < n; i++) {
 116     val <<= 8;
 117     val |= parts[i] & 0xff;
 118   }
 119   return (val);
 120 }