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

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Portions Copyright (C) 2004, 2005, 2007, 2009  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. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by the University of
  35  *      California, Berkeley and its contributors.
  36  * 4. Neither the name of the University nor the names of its contributors
  37  *    may be used to endorse or promote products derived from this software
  38  *    without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  */
  52
  53 /*
  54  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  55  *
  56  * Permission to use, copy, modify, and distribute this software for any
  57  * purpose with or without fee is hereby granted, provided that the above
  58  * copyright notice and this permission notice appear in all copies, and that
  59  * the name of Digital Equipment Corporation not be used in advertising or
  60  * publicity pertaining to distribution of the document or software without
  61  * specific, written prior permission.
  62  *
  63  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  64  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  65  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  66  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  67  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  68  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  69  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  70  * SOFTWARE.
  71  */
  72 /*! \file */
  73
  74 #if defined(LIBC_SCCS) && !defined(lint)
  75 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  76 static char rcsid[] = "Id: inet_aton.c,v 1.21.332.2 2009/03/05 23:47:03 tbox Exp";
  77 #endif /* LIBC_SCCS and not lint */
  78
  79 #include <config.h>
  80
  81 #include <ctype.h>
  82 #include <stddef.h>             /* Required for NULL. */
  83
  84 #include <isc/types.h>
  85 #include <isc/net.h>
  86
  87 /*%
  88  * Check whether "cp" is a valid ascii representation
  89  * of an Internet address and convert to a binary address.
  90  * Returns 1 if the address is valid, 0 if not.
  91  * This replaces inet_addr, the return value from which
  92  * cannot distinguish between failure and a local broadcast address.
  93  */
  94 int
  95 isc_net_aton(const char *cp, struct in_addr *addr) {
  96         unsigned long val;
  97         int base, n;
  98         unsigned char c;
  99         isc_uint8_t parts[4];
 100         isc_uint8_t *pp = parts;
 101         int digit;
 102
 103         c = *cp;
 104         for (;;) {
 105                 /*
 106                  * Collect number up to ``.''.
 107                  * Values are specified as for C:
 108                  * 0x=hex, 0=octal, isdigit=decimal.
 109                  */
 110                 if (!isdigit(c & 0xff))
 111                         return (0);
 112                 val = 0; base = 10; digit = 0;
 113                 if (c == '0') {
 114                         c = *++cp;
 115                         if (c == 'x' || c == 'X')
 116                                 base = 16, c = *++cp;
 117                         else {
 118                                 base = 8;
 119                                 digit = 1;
 120                         }
 121                 }
 122                 for (;;) {
 123                         /*
 124                          * isascii() is valid for all integer values, and
 125                          * when it is true, c is known to be in scope
 126                          * for isdigit().  No cast necessary.  Similar
 127                          * comment applies for later ctype uses.
 128                          */
 129                         if (isascii(c) && isdigit(c)) {
 130                                 if (base == 8 && (c == '8' || c == '9'))
 131                                         return (0);
 132                                 val = (val * base) + (c - '0');
 133                                 c = *++cp;
 134                                 digit = 1;
 135                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 136                                 val = (val << 4) |
 137                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 138                                 c = *++cp;
 139                                 digit = 1;
 140                         } else
 141                                 break;
 142                 }
 143                 if (c == '.') {
 144                         /*
 145                          * Internet format:
 146                          *      a.b.c.d
 147                          *      a.b.c   (with c treated as 16 bits)
 148                          *      a.b     (with b treated as 24 bits)
 149                          */
 150                         if (pp >= parts + 3 || val > 0xffU)
 151                                 return (0);
 152                         *pp++ = (isc_uint8_t)val;
 153                         c = *++cp;
 154                 } else
 155                         break;
 156         }
 157         /*
 158          * Check for trailing characters.
 159          */
 160         if (c != '\0' && (!isascii(c) || !isspace(c)))
 161                 return (0);
 162         /*
 163          * Did we get a valid digit?
 164          */
 165         if (!digit)
 166                 return (0);
 167         /*
 168          * Concoct the address according to
 169          * the number of parts specified.
 170          */
 171         n = pp - parts + 1;
 172         switch (n) {
 173         case 1:                         /* a -- 32 bits */
 174                 break;
 175
 176         case 2:                         /* a.b -- 8.24 bits */
 177                 if (val > 0xffffffU)
 178                         return (0);
 179                 val |= parts[0] << 24;
 180                 break;
 181
 182         case 3:                         /* a.b.c -- 8.8.16 bits */
 183                 if (val > 0xffffU)
 184                         return (0);
 185                 val |= (parts[0] << 24) | (parts[1] << 16);
 186                 break;
 187
 188         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 189                 if (val > 0xffU)
 190                         return (0);
 191                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 192                 break;
 193         }
 194         if (addr != NULL)
 195                 addr->s_addr = htonl(val);
 196
 197         return (1);
 198 }