src/kits/network/netresolv/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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)inet_network.c      8.1 (Berkeley) 6/4/93";
  40 #else
  41 __RCSID("$NetBSD: inet_network.c,v 1.4 2008/01/20 04:56:08 christos Exp $");
  42 #endif
  43 #endif /* LIBC_SCCS and not lint */
  44
  45 #include "port_before.h"
  46
  47 #include <sys/types.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50
  51 #include <assert.h>
  52 #include <ctype.h>
  53 #ifdef _DIAGNOSTIC
  54 #include <stddef.h>     /* for NULL */
  55 #endif
  56
  57 #include "port_after.h"
  58
  59 /*
  60  * Internet network address interpretation routine.
  61  * The library routines call this routine to interpret
  62  * network numbers.
  63  */
  64 in_addr_t
  65 inet_network(const char *cp)
  66 {
  67         in_addr_t val;
  68         size_t i, n;
  69         u_char c;
  70         in_addr_t parts[4], *pp = parts;
  71         int digit, base;
  72
  73         assert(cp != NULL);
  74
  75 again:
  76         val = 0; base = 10; digit = 0;
  77         if (*cp == '0')
  78                 digit = 1, base = 8, cp++;
  79         if (*cp == 'x' || *cp == 'X')
  80                 digit = 0, base = 16, cp++;
  81         while ((c = *cp) != 0) {
  82                 if (isdigit(c)) {
  83                         if (base == 8 && (c == '8' || c == '9'))
  84                                 return (INADDR_NONE);
  85                         val = (val * base) + (c - '0');
  86                         cp++;
  87                         digit = 1;
  88                         continue;
  89                 }
  90                 if (base == 16 && isxdigit(c)) {
  91                         val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  92                         cp++;
  93                         digit = 1;
  94                         continue;
  95                 }
  96                 break;
  97         }
  98         if (!digit)
  99                 return (INADDR_NONE);
 100         if (pp >= parts + 4 || val > 0xff)
 101                 return (INADDR_NONE);
 102         if (*cp == '.') {
 103                 *pp++ = val, cp++;
 104                 goto again;
 105         }
 106         if (*cp && !isspace((u_char) *cp))
 107                 return (INADDR_NONE);
 108         *pp++ = val;
 109         n = pp - parts;
 110         if (n > 4)
 111                 return (INADDR_NONE);
 112         for (val = 0, i = 0; i < n; i++) {
 113                 val <<= 8;
 114                 val |= parts[i] & 0xff;
 115         }
 116         return (val);
 117 }
 118
 119 #undef inet_network
 120 #pragma weak inet_network = __inet_network