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/* Legacy IPv4 text-to-address functions.
Copyright (C) 2019-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/*
* Copyright (c) 1983, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/*
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <endian.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
/* Check whether "cp" is a valid ASCII representation of an IPv4
Internet address and convert it to a binary address. Returns 1 if
the address is valid, 0 if not. This replaces inet_addr, the
return value from which cannot distinguish between failure and a
local broadcast address. Write a pointer to the first
non-converted character to *endp. */
static int
inet_aton_end (const char *cp, struct in_addr *addr, const char **endp)
{
static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
in_addr_t val;
char c;
union iaddr
{
uint8_t bytes[4];
uint32_t word;
} res;
uint8_t *pp = res.bytes;
int digit;
int saved_errno = errno;
__set_errno (0);
res.word = 0;
c = *cp;
for (;;)
{
/* Collect number up to ``.''. Values are specified as for C:
0x=hex, 0=octal, isdigit=decimal. */
if (!isdigit (c))
goto ret_0;
{
char *endp;
unsigned long ul = __strtoul_internal (cp, &endp, 0, 0);
if (ul == ULONG_MAX && errno == ERANGE)
goto ret_0;
if (ul > 0xfffffffful)
goto ret_0;
val = ul;
digit = cp != endp;
cp = endp;
}
c = *cp;
if (c == '.')
{
/* Internet format:
a.b.c.d
a.b.c (with c treated as 16 bits)
a.b (with b treated as 24 bits). */
if (pp > res.bytes + 2 || val > 0xff)
goto ret_0;
*pp++ = val;
c = *++cp;
}
else
break;
}
/* Check for trailing characters. */
if (c != '\0' && (!isascii (c) || !isspace (c)))
goto ret_0;
/* Did we get a valid digit? */
if (!digit)
goto ret_0;
/* Check whether the last part is in its limits depending on the
number of parts in total. */
if (val > max[pp - res.bytes])
goto ret_0;
if (addr != NULL)
addr->s_addr = res.word | htonl (val);
*endp = cp;
__set_errno (saved_errno);
return 1;
ret_0:
__set_errno (saved_errno);
return 0;
}
int
__inet_aton_exact (const char *cp, struct in_addr *addr)
{
struct in_addr val;
const char *endp;
/* Check that inet_aton_end parsed the entire string. */
if (inet_aton_end (cp, &val, &endp) != 0 && *endp == 0)
{
*addr = val;
return 1;
}
else
return 0;
}
libc_hidden_def (__inet_aton_exact)
/* inet_aton ignores trailing garbage. */
int
__inet_aton_ignore_trailing (const char *cp, struct in_addr *addr)
{
const char *endp;
return inet_aton_end (cp, addr, &endp);
}
weak_alias (__inet_aton_ignore_trailing, inet_aton)
/* ASCII IPv4 Internet address interpretation routine. The value
returned is in network order. */
in_addr_t
__inet_addr (const char *cp)
{
struct in_addr val;
const char *endp;
if (inet_aton_end (cp, &val, &endp))
return val.s_addr;
return INADDR_NONE;
}
weak_alias (__inet_addr, inet_addr)
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