nsprpub/pr/src/misc/praton.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /*******************************************************************************
   3  * The following function pr_inet_aton is based on the BSD function inet_aton
   4  * with some modifications. The license and copyright notices applying to this
   5  * function appear below. Modifications are also according to the license below.
   6  ******************************************************************************/
   7
   8 #include "prnetdb.h"
   9
  10 /*
  11  * Copyright (c) 1983, 1990, 1993
  12  *    The Regents of the University of California.  All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  41  *
  42  * Permission to use, copy, modify, and distribute this software for any
  43  * purpose with or without fee is hereby granted, provided that the above
  44  * copyright notice and this permission notice appear in all copies, and that
  45  * the name of Digital Equipment Corporation not be used in advertising or
  46  * publicity pertaining to distribution of the document or software without
  47  * specific, written prior permission.
  48  *
  49  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  50  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  51  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  52  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  53  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  54  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  55  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  56  * SOFTWARE.
  57  */
  58
  59 /*
  60  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  61  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  62  *
  63  * Permission to use, copy, modify, and distribute this software for any
  64  * purpose with or without fee is hereby granted, provided that the above
  65  * copyright notice and this permission notice appear in all copies.
  66  *
  67  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  68  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  69  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  70  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  71  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  72  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  73  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  74  */
  75
  76 #define XX 127
  77 static const unsigned char index_hex[256] = {
  78     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  79     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  80     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, 0,  1,  2,  3,  4,  5,  6,  7,  8,
  81     9,  XX, XX, XX, XX, XX, XX, XX, 10, 11, 12, 13, 14, 15, XX, XX, XX, XX, XX,
  82     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  83     XX, XX, 10, 11, 12, 13, 14, 15, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  84     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  85     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  86     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  87     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  88     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  89     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  90     XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
  91     XX, XX, XX, XX, XX, XX, XX, XX, XX,
  92 };
  93
  94 static PRBool _isdigit(char c) { return c >= '0' && c <= '9'; }
  95 static PRBool _isxdigit(char c) { return index_hex[(unsigned char)c] != XX; }
  96 static PRBool _isspace(char c) { return c == ' ' || (c >= '\t' && c <= '\r'); }
  97 #undef XX
  98
  99 int pr_inet_aton(const char* cp, PRUint32* addr) {
 100   PRUint32 val;
 101   int base, n;
 102   char c;
 103   PRUint8 parts[4];
 104   PRUint8* pp = parts;
 105   int digit;
 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)) {
 115       return (0);
 116     }
 117     val = 0;
 118     base = 10;
 119     digit = 0;
 120     if (c == '0') {
 121       c = *++cp;
 122       if (c == 'x' || c == 'X') {
 123         base = 16, c = *++cp;
 124       } else {
 125         base = 8;
 126         digit = 1;
 127       }
 128     }
 129     for (;;) {
 130       if (_isdigit(c)) {
 131         if (base == 8 && (c == '8' || c == '9')) {
 132           return (0);
 133         }
 134         val = (val * base) + (c - '0');
 135         c = *++cp;
 136         digit = 1;
 137       } else if (base == 16 && _isxdigit(c)) {
 138         val = (val << 4) + index_hex[(unsigned char)c];
 139         c = *++cp;
 140         digit = 1;
 141       } else {
 142         break;
 143       }
 144     }
 145     if (c == '.') {
 146       /*
 147        * Internet format:
 148        *    a.b.c.d
 149        *    a.b.c    (with c treated as 16 bits)
 150        *    a.b    (with b treated as 24 bits)
 151        */
 152       if (pp >= parts + 3 || val > 0xffU) {
 153         return (0);
 154       }
 155       *pp++ = val;
 156       c = *++cp;
 157     } else {
 158       break;
 159     }
 160   }
 161   /*
 162    * Check for trailing characters.
 163    */
 164   if (c != '\0' && !_isspace(c)) {
 165     return (0);
 166   }
 167   /*
 168    * Did we get a valid digit?
 169    */
 170   if (!digit) {
 171     return (0);
 172   }
 173   /*
 174    * Concoct the address according to
 175    * the number of parts specified.
 176    */
 177   n = pp - parts + 1;
 178   switch (n) {
 179     case 1: /*%< a -- 32 bits */
 180       break;
 181
 182     case 2: /*%< a.b -- 8.24 bits */
 183       if (val > 0xffffffU) {
 184         return (0);
 185       }
 186       val |= (unsigned int)parts[0] << 24;
 187       break;
 188
 189     case 3: /*%< a.b.c -- 8.8.16 bits */
 190       if (val > 0xffffU) {
 191         return (0);
 192       }
 193       val |= ((unsigned int)parts[0] << 24) | ((unsigned int)parts[1] << 16);
 194       break;
 195
 196     case 4: /*%< a.b.c.d -- 8.8.8.8 bits */
 197       if (val > 0xffU) {
 198         return (0);
 199       }
 200       val |= ((unsigned int)parts[0] << 24) | ((unsigned int)parts[1] << 16) |
 201              ((unsigned int)parts[2] << 8);
 202       break;
 203   }
 204   *addr = PR_htonl(val);
 205   return (1);
 206 }