external/bsd/bind/dist/lib/isc/inet_aton.c

   1 /*      $NetBSD: inet_aton.c,v 1.7 2014/12/10 04:37:59 christos Exp $   */
   2
   3 /*
   4  * Portions Copyright (C) 2004, 2005, 2007, 2008, 2012-2014  Internet Systems Consortium, Inc. ("ISC")
   5  * Portions Copyright (C) 1996-2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*
  21  * Copyright (c) 1983, 1990, 1993
  22  *    The Regents of the University of California.  All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. Neither the name of the University nor the names of its contributors
  33  *    may be used to endorse or promote products derived from this software
  34  *    without specific prior written permission.
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  37  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  39  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  40  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  41  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  42  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  44  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  45  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  46  * SUCH DAMAGE.
  47  */
  48
  49 /*
  50  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  51  *
  52  * Permission to use, copy, modify, and distribute this software for any
  53  * purpose with or without fee is hereby granted, provided that the above
  54  * copyright notice and this permission notice appear in all copies, and that
  55  * the name of Digital Equipment Corporation not be used in advertising or
  56  * publicity pertaining to distribution of the document or software without
  57  * specific, written prior permission.
  58  *
  59  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  60  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  61  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  62  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  63  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  64  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  65  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  66  * SOFTWARE.
  67  */
  68 /*! \file */
  69
  70 #if defined(LIBC_SCCS) && !defined(lint)
  71 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  72 static char rcsid[] = "Id: inet_aton.c,v 1.23 2008/12/01 23:47:45 tbox Exp ";
  73 #endif /* LIBC_SCCS and not lint */
  74
  75 #include <config.h>
  76
  77 #include <ctype.h>
  78 #include <stddef.h>             /* Required for NULL. */
  79
  80 #include <isc/types.h>
  81 #include <isc/net.h>
  82
  83 /*%
  84  * Check whether "cp" is a valid ascii representation
  85  * of an Internet address and convert to a binary address.
  86  * Returns 1 if the address is valid, 0 if not.
  87  * This replaces inet_addr, the return value from which
  88  * cannot distinguish between failure and a local broadcast address.
  89  */
  90 int
  91 isc_net_aton(const char *cp, struct in_addr *addr) {
  92         isc_uint32_t val;
  93         int base;
  94         ptrdiff_t n;
  95         unsigned char c;
  96         isc_uint8_t parts[4];
  97         isc_uint8_t *pp = parts;
  98         int digit;
  99
 100         c = *cp;
 101         for (;;) {
 102                 /*
 103                  * Collect number up to ``.''.
 104                  * Values are specified as for C:
 105                  * 0x=hex, 0=octal, isdigit=decimal.
 106                  */
 107                 if (!isdigit(c & 0xff))
 108                         return (0);
 109                 val = 0; base = 10; digit = 0;
 110                 if (c == '0') {
 111                         c = *++cp;
 112                         if (c == 'x' || c == 'X')
 113                                 base = 16, c = *++cp;
 114                         else {
 115                                 base = 8;
 116                                 digit = 1;
 117                         }
 118                 }
 119                 for (;;) {
 120                         /*
 121                          * isascii() is valid for all integer values, and
 122                          * when it is true, c is known to be in scope
 123                          * for isdigit().  No cast necessary.  Similar
 124                          * comment applies for later ctype uses.
 125                          */
 126                         if (isascii(c) && isdigit(c)) {
 127                                 if (base == 8 && (c == '8' || c == '9'))
 128                                         return (0);
 129                                 val = (val * base) + (c - '0');
 130                                 c = *++cp;
 131                                 digit = 1;
 132                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 133                                 val = (val << 4) |
 134                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 135                                 c = *++cp;
 136                                 digit = 1;
 137                         } else
 138                                 break;
 139                 }
 140                 if (c == '.') {
 141                         /*
 142                          * Internet format:
 143                          *      a.b.c.d
 144                          *      a.b.c   (with c treated as 16 bits)
 145                          *      a.b     (with b treated as 24 bits)
 146                          */
 147                         if (pp >= parts + 3 || val > 0xffU)
 148                                 return (0);
 149                         *pp++ = (isc_uint8_t)val;
 150                         c = *++cp;
 151                 } else
 152                         break;
 153         }
 154         /*
 155          * Check for trailing characters.
 156          */
 157         if (c != '\0' && (!isascii(c) || !isspace(c)))
 158                 return (0);
 159         /*
 160          * Did we get a valid digit?
 161          */
 162         if (!digit)
 163                 return (0);
 164         /*
 165          * Concoct the address according to
 166          * the number of parts specified.
 167          */
 168         n = pp - parts + 1;
 169         switch (n) {
 170         case 1:                         /* a -- 32 bits */
 171                 break;
 172
 173         case 2:                         /* a.b -- 8.24 bits */
 174                 if (val > 0xffffffU)
 175                         return (0);
 176                 val |= parts[0] << 24;
 177                 break;
 178
 179         case 3:                         /* a.b.c -- 8.8.16 bits */
 180                 if (val > 0xffffU)
 181                         return (0);
 182                 val |= (parts[0] << 24) | (parts[1] << 16);
 183                 break;
 184
 185         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 186                 if (val > 0xffU)
 187                         return (0);
 188                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 189                 break;
 190         }
 191         if (addr != NULL)
 192                 addr->s_addr = htonl(val);
 193
 194         return (1);
 195 }