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)