contrib/bind-9.5.2/lib/lwres/lwinetaton.c

   1 /*
   2  * Portions Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Portions Copyright (C) 1996-2001, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*
  19  * Copyright (c) 1983, 1990, 1993
  20  *    The Regents of the University of California.  All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *      This product includes software developed by the University of
  33  *      California, Berkeley and its contributors.
  34  * 4. Neither the name of the University nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  */
  50
  51 /*
  52  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  53  *
  54  * Permission to use, copy, modify, and distribute this software for any
  55  * purpose with or without fee is hereby granted, provided that the above
  56  * copyright notice and this permission notice appear in all copies, and that
  57  * the name of Digital Equipment Corporation not be used in advertising or
  58  * publicity pertaining to distribution of the document or software without
  59  * specific, written prior permission.
  60  *
  61  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  62  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  63  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  64  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  65  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  66  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  67  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  68  * SOFTWARE.
  69  */
  70
  71 /*! \file lwinetaton.c
  72  */
  73 #if defined(LIBC_SCCS) && !defined(lint)
  74 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  75 static char rcsid[] = "$Id: lwinetaton.c,v 1.16 2007/06/19 23:47:22 tbox Exp $";
  76 #endif /* LIBC_SCCS and not lint */
  77
  78 #include <config.h>
  79
  80 #include <ctype.h>
  81
  82 #include <stddef.h>
  83
  84 #include <lwres/int.h>
  85 #include <lwres/net.h>
  86
  87 #include "assert_p.h"
  88
  89 /*!
  90  * Check whether "cp" is a valid ascii representation
  91  * of an Internet address and convert to a binary address.
  92  * Returns 1 if the address is valid, 0 if not.
  93  * This replaces inet_addr, the return value from which
  94  * cannot distinguish between failure and a local broadcast address.
  95  */
  96 int
  97 lwres_net_aton(const char *cp, struct in_addr *addr) {
  98         unsigned long val;
  99         int base, n;
 100         unsigned char c;
 101         lwres_uint8_t parts[4];
 102         lwres_uint8_t *pp = parts;
 103         int digit;
 104
 105         REQUIRE(cp != NULL);
 106
 107         c = *cp;
 108         for (;;) {
 109                 /*
 110                  * Collect number up to ``.''.
 111                  * Values are specified as for C:
 112                  * 0x=hex, 0=octal, isdigit=decimal.
 113                  */
 114                 if (!isdigit(c & 0xff))
 115                         return (0);
 116                 val = 0;
 117                 base = 10;
 118                 digit = 0;
 119                 if (c == '0') {
 120                         c = *++cp;
 121                         if (c == 'x' || c == 'X') {
 122                                 base = 16;
 123                                 c = *++cp;
 124                         } else {
 125                                 base = 8;
 126                                 digit = 1;
 127                         }
 128                 }
 129                 for (;;) {
 130                         /*
 131                          * isascii() is valid for all integer values, and
 132                          * when it is true, c is known to be in scope
 133                          * for isdigit().  No cast necessary.  Similar
 134                          * comment applies for later ctype uses.
 135                          */
 136                         if (isascii(c) && isdigit(c)) {
 137                                 if (base == 8 && (c == '8' || c == '9'))
 138                                         return (0);
 139                                 val = (val * base) + (c - '0');
 140                                 c = *++cp;
 141                                 digit = 1;
 142                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 143                                 val = (val << 4) |
 144                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 145                                 c = *++cp;
 146                                 digit = 1;
 147                         } else
 148                                 break;
 149                 }
 150                 if (c == '.') {
 151                         /*
 152                          * Internet format:
 153                          *      a.b.c.d
 154                          *      a.b.c   (with c treated as 16 bits)
 155                          *      a.b     (with b treated as 24 bits)
 156                          */
 157                         if (pp >= parts + 3 || val > 0xffU)
 158                                 return (0);
 159                         *pp++ = (lwres_uint8_t)val;
 160                         c = *++cp;
 161                 } else
 162                         break;
 163         }
 164         /*
 165          * Check for trailing characters.
 166          */
 167         if (c != '\0' && (!isascii(c) || !isspace(c)))
 168                 return (0);
 169         /*
 170          * Did we get a valid digit?
 171          */
 172         if (!digit)
 173                 return (0);
 174         /*
 175          * Concoct the address according to
 176          * the number of parts specified.
 177          */
 178         n = pp - parts + 1;
 179         switch (n) {
 180         case 1:                         /* a -- 32 bits */
 181                 break;
 182
 183         case 2:                         /* a.b -- 8.24 bits */
 184                 if (val > 0xffffffU)
 185                         return (0);
 186                 val |= parts[0] << 24;
 187                 break;
 188
 189         case 3:                         /* a.b.c -- 8.8.16 bits */
 190                 if (val > 0xffffU)
 191                         return (0);
 192                 val |= (parts[0] << 24) | (parts[1] << 16);
 193                 break;
 194
 195         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 196                 if (val > 0xffU)
 197                         return (0);
 198                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 199                 break;
 200         }
 201         if (addr != NULL)
 202                 addr->s_addr = htonl(val);
 203
 204         return (1);
 205 }