contrib/bind-9.5.2/lib/bind/inet/inet_addr.c

   1 /*
   2  * Copyright (c) 1983, 1990, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  */
  53
  54 /*
  55  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  56  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  57  *
  58  * Permission to use, copy, modify, and distribute this software for any
  59  * purpose with or without fee is hereby granted, provided that the above
  60  * copyright notice and this permission notice appear in all copies.
  61  *
  62  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  63  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  65  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  66  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  67  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  68  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  69  */
  70
  71 #if defined(LIBC_SCCS) && !defined(lint)
  72 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  73 static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $";
  74 #endif /* LIBC_SCCS and not lint */
  75
  76 #include "port_before.h"
  77
  78 #include <sys/types.h>
  79 #include <sys/param.h>
  80
  81 #include <netinet/in.h>
  82 #include <arpa/inet.h>
  83
  84 #include <ctype.h>
  85
  86 #include "port_after.h"
  87
  88 /*%
  89  * Ascii internet address interpretation routine.
  90  * The value returned is in network order.
  91  */
  92 u_long
  93 inet_addr(const char *cp) {
  94         struct in_addr val;
  95
  96         if (inet_aton(cp, &val))
  97                 return (val.s_addr);
  98         return (INADDR_NONE);
  99 }
 100
 101 /*%
 102  * Check whether "cp" is a valid ascii representation
 103  * of an Internet address and convert to a binary address.
 104  * Returns 1 if the address is valid, 0 if not.
 105  * This replaces inet_addr, the return value from which
 106  * cannot distinguish between failure and a local broadcast address.
 107  */
 108 int
 109 inet_aton(const char *cp, struct in_addr *addr) {
 110         u_long val;
 111         int base, n;
 112         char c;
 113         u_int8_t parts[4];
 114         u_int8_t *pp = parts;
 115         int digit;
 116
 117         c = *cp;
 118         for (;;) {
 119                 /*
 120                  * Collect number up to ``.''.
 121                  * Values are specified as for C:
 122                  * 0x=hex, 0=octal, isdigit=decimal.
 123                  */
 124                 if (!isdigit((unsigned char)c))
 125                         return (0);
 126                 val = 0; base = 10; digit = 0;
 127                 if (c == '0') {
 128                         c = *++cp;
 129                         if (c == 'x' || c == 'X')
 130                                 base = 16, c = *++cp;
 131                         else {
 132                                 base = 8;
 133                                 digit = 1 ;
 134                         }
 135                 }
 136                 for (;;) {
 137                         if (isascii(c) && isdigit((unsigned char)c)) {
 138                                 if (base == 8 && (c == '8' || c == '9'))
 139                                         return (0);
 140                                 val = (val * base) + (c - '0');
 141                                 c = *++cp;
 142                                 digit = 1;
 143                         } else if (base == 16 && isascii(c) &&
 144                                    isxdigit((unsigned char)c)) {
 145                                 val = (val << 4) |
 146                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 147                                 c = *++cp;
 148                                 digit = 1;
 149                         } else
 150                                 break;
 151                 }
 152                 if (c == '.') {
 153                         /*
 154                          * Internet format:
 155                          *      a.b.c.d
 156                          *      a.b.c   (with c treated as 16 bits)
 157                          *      a.b     (with b treated as 24 bits)
 158                          */
 159                         if (pp >= parts + 3 || val > 0xffU)
 160                                 return (0);
 161                         *pp++ = val;
 162                         c = *++cp;
 163                 } else
 164                         break;
 165         }
 166         /*
 167          * Check for trailing characters.
 168          */
 169         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 170                 return (0);
 171         /*
 172          * Did we get a valid digit?
 173          */
 174         if (!digit)
 175                 return (0);
 176         /*
 177          * Concoct the address according to
 178          * the number of parts specified.
 179          */
 180         n = pp - parts + 1;
 181         switch (n) {
 182         case 1:                         /*%< a -- 32 bits */
 183                 break;
 184
 185         case 2:                         /*%< a.b -- 8.24 bits */
 186                 if (val > 0xffffffU)
 187                         return (0);
 188                 val |= parts[0] << 24;
 189                 break;
 190
 191         case 3:                         /*%< a.b.c -- 8.8.16 bits */
 192                 if (val > 0xffffU)
 193                         return (0);
 194                 val |= (parts[0] << 24) | (parts[1] << 16);
 195                 break;
 196
 197         case 4:                         /*%< a.b.c.d -- 8.8.8.8 bits */
 198                 if (val > 0xffU)
 199                         return (0);
 200                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 201                 break;
 202         }
 203         if (addr != NULL)
 204                 addr->s_addr = htonl(val);
 205         return (1);
 206 }
 207
 208 /*! \file */