lib/libc/inet/inet_network.c

   1 /*      $NetBSD: inet_network.c,v 1.4 2008/01/20 04:56:08 christos Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 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
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)inet_network.c      8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: inet_network.c,v 1.4 2008/01/20 04:56:08 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include "namespace.h"
  42 #include <sys/types.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45
  46 #include <assert.h>
  47 #include <ctype.h>
  48 #ifdef _DIAGNOSTIC
  49 #include <stddef.h>     /* for NULL */
  50 #endif
  51
  52 #ifdef __weak_alias
  53 __weak_alias(inet_network,_inet_network)
  54 #endif
  55
  56 /*
  57  * Internet network address interpretation routine.
  58  * The library routines call this routine to interpret
  59  * network numbers.
  60  */
  61 in_addr_t
  62 inet_network(const char *cp)
  63 {
  64         in_addr_t val;
  65         size_t i, n;
  66         u_char c;
  67         in_addr_t parts[4], *pp = parts;
  68         int digit, base;
  69
  70         _DIAGASSERT(cp != NULL);
  71
  72 again:
  73         val = 0; base = 10; digit = 0;
  74         if (*cp == '0')
  75                 digit = 1, base = 8, cp++;
  76         if (*cp == 'x' || *cp == 'X')
  77                 digit = 0, base = 16, cp++;
  78         while ((c = *cp) != 0) {
  79                 if (isdigit(c)) {
  80                         if (base == 8 && (c == '8' || c == '9'))
  81                                 return (INADDR_NONE);
  82                         val = (val * base) + (c - '0');
  83                         cp++;
  84                         digit = 1;
  85                         continue;
  86                 }
  87                 if (base == 16 && isxdigit(c)) {
  88                         val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  89                         cp++;
  90                         digit = 1;
  91                         continue;
  92                 }
  93                 break;
  94         }
  95         if (!digit)
  96                 return (INADDR_NONE);
  97         if (pp >= parts + 4 || val > 0xff)
  98                 return (INADDR_NONE);
  99         if (*cp == '.') {
 100                 *pp++ = val, cp++;
 101                 goto again;
 102         }
 103         if (*cp && !isspace((u_char) *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 }