inet/inet_net.c

   1 /*
   2  * Copyright (c) 1983, 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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /* Copyright (C) 2013-2023 Free Software Foundation, Inc.
  31    This file is part of the GNU C Library.
  32
  33    The GNU C Library is free software; you can redistribute it and/or
  34    modify it under the terms of the GNU Lesser General Public
  35    License as published by the Free Software Foundation; either
  36    version 2.1 of the License, or (at your option) any later version.
  37
  38    The GNU C Library is distributed in the hope that it will be useful,
  39    but WITHOUT ANY WARRANTY; without even the implied warranty of
  40    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  41    Lesser General Public License for more details.
  42
  43    You should have received a copy of the GNU Lesser General Public
  44    License along with the GNU C Library; if not, see
  45    <https://www.gnu.org/licenses/>.  */
  46
  47 #include <sys/types.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <ctype.h>
  51
  52 /*
  53  * Internet network address interpretation routine.
  54  * The library routines call this routine to interpret
  55  * network numbers.
  56  */
  57 uint32_t
  58 __inet_network (const char *cp)
  59 {
  60         uint32_t val, base, n, i;
  61         char c;
  62         uint32_t parts[4], *pp = parts;
  63         int digit;
  64
  65 again:
  66         val = 0; base = 10; digit = 0;
  67         if (*cp == '0')
  68                 digit = 1, base = 8, cp++;
  69         if (*cp == 'x' || *cp == 'X')
  70                 digit = 0, base = 16, cp++;
  71         while ((c = *cp) != 0) {
  72                 if (isdigit(c)) {
  73                         if (base == 8 && (c == '8' || c == '9'))
  74                                 return (INADDR_NONE);
  75                         val = (val * base) + (c - '0');
  76                         cp++;
  77                         digit = 1;
  78                         continue;
  79                 }
  80                 if (base == 16 && isxdigit(c)) {
  81                         val = (val << 4) + (tolower (c) + 10 - 'a');
  82                         cp++;
  83                         digit = 1;
  84                         continue;
  85                 }
  86                 break;
  87         }
  88         if (!digit)
  89                 return (INADDR_NONE);
  90         if (pp >= parts + 4 || val > 0xff)
  91                 return (INADDR_NONE);
  92         if (*cp == '.') {
  93                 *pp++ = val, cp++;
  94                 goto again;
  95         }
  96         while (isspace(*cp))
  97                 cp++;
  98         if (*cp)
  99                 return (INADDR_NONE);
 100         if (pp >= parts + 4 || val > 0xff)
 101                 return (INADDR_NONE);
 102         *pp++ = val;
 103         n = pp - parts;
 104         for (val = 0, i = 0; i < n; i++) {
 105                 val <<= 8;
 106                 val |= parts[i] & 0xff;
 107         }
 108         return (val);
 109 }
 110 libc_hidden_def (__inet_network)
 111 weak_alias (__inet_network, inet_network)