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/* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form
Copyright (C) 2006, 2008-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/*
* 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 <config.h>
/* Specification. */
#include <arpa/inet.h>
#if HAVE_DECL_INET_PTON
# undef inet_pton
int
rpl_inet_pton (int af, const char *restrict src, void *restrict dst)
{
return inet_pton (af, src, dst);
}
#else
# include <c-ctype.h>
# include <string.h>
# include <errno.h>
# define NS_INADDRSZ 4
# define NS_IN6ADDRSZ 16
# define NS_INT16SZ 2
/*
* WARNING: Don't even consider trying to compile this on a system where
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
*/
static int inet_pton4 (const char *src, unsigned char *dst);
# if HAVE_IPV6
static int inet_pton6 (const char *src, unsigned char *dst);
# endif
/* int
* inet_pton(af, src, dst)
* convert from presentation format (which usually means ASCII printable)
* to network format (which is usually some kind of binary format).
* return:
* 1 if the address was valid for the specified address family
* 0 if the address wasn't valid ('dst' is untouched in this case)
* -1 if some other error occurred ('dst' is untouched in this case, too)
* author:
* Paul Vixie, 1996.
*/
int
inet_pton (int af, const char *restrict src, void *restrict dst)
{
switch (af)
{
case AF_INET:
return (inet_pton4 (src, dst));
# if HAVE_IPV6
case AF_INET6:
return (inet_pton6 (src, dst));
# endif
default:
errno = EAFNOSUPPORT;
return (-1);
}
/* NOTREACHED */
}
/* int
* inet_pton4(src, dst)
* like inet_aton() but without all the hexadecimal, octal (with the
* exception of 0) and shorthand.
* return:
* 1 if 'src' is a valid dotted quad, else 0.
* notice:
* does not touch 'dst' unless it's returning 1.
* author:
* Paul Vixie, 1996.
*/
static int
inet_pton4 (const char *restrict src, unsigned char *restrict dst)
{
int saw_digit, octets, ch;
unsigned char tmp[NS_INADDRSZ], *tp;
saw_digit = 0;
octets = 0;
*(tp = tmp) = 0;
while ((ch = *src++) != '\0')
{
if (ch >= '0' && ch <= '9')
{
unsigned new = *tp * 10 + (ch - '0');
if (saw_digit && *tp == 0)
return (0);
if (new > 255)
return (0);
*tp = new;
if (!saw_digit)
{
if (++octets > 4)
return (0);
saw_digit = 1;
}
}
else if (ch == '.' && saw_digit)
{
if (octets == 4)
return (0);
*++tp = 0;
saw_digit = 0;
}
else
return (0);
}
if (octets < 4)
return (0);
memcpy (dst, tmp, NS_INADDRSZ);
return (1);
}
# if HAVE_IPV6
/* int
* inet_pton6(src, dst)
* convert presentation level address to network order binary form.
* return:
* 1 if 'src' is a valid [RFC1884 2.2] address, else 0.
* notice:
* (1) does not touch 'dst' unless it's returning 1.
* (2) :: in a full address is silently ignored.
* credit:
* inspired by Mark Andrews.
* author:
* Paul Vixie, 1996.
*/
static int
inet_pton6 (const char *restrict src, unsigned char *restrict dst)
{
static const char xdigits[] = "0123456789abcdef";
unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
const char *curtok;
int ch, saw_xdigit;
unsigned val;
tp = memset (tmp, '\0', NS_IN6ADDRSZ);
endp = tp + NS_IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if (*src == ':')
if (*++src != ':')
return (0);
curtok = src;
saw_xdigit = 0;
val = 0;
while ((ch = c_tolower (*src++)) != '\0')
{
const char *pch;
pch = strchr (xdigits, ch);
if (pch != NULL)
{
val <<= 4;
val |= (pch - xdigits);
if (val > 0xffff)
return (0);
saw_xdigit = 1;
continue;
}
if (ch == ':')
{
curtok = src;
if (!saw_xdigit)
{
if (colonp)
return (0);
colonp = tp;
continue;
}
else if (*src == '\0')
{
return (0);
}
if (tp + NS_INT16SZ > endp)
return (0);
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
saw_xdigit = 0;
val = 0;
continue;
}
if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
inet_pton4 (curtok, tp) > 0)
{
tp += NS_INADDRSZ;
saw_xdigit = 0;
break; /* '\0' was seen by inet_pton4(). */
}
return (0);
}
if (saw_xdigit)
{
if (tp + NS_INT16SZ > endp)
return (0);
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
}
if (colonp != NULL)
{
/*
* Since some memmove()'s erroneously fail to handle
* overlapping regions, we'll do the shift by hand.
*/
const int n = tp - colonp;
int i;
if (tp == endp)
return (0);
for (i = 1; i <= n; i++)
{
endp[-i] = colonp[n - i];
colonp[n - i] = 0;
}
tp = endp;
}
if (tp != endp)
return (0);
memcpy (dst, tmp, NS_IN6ADDRSZ);
return (1);
}
# endif
#endif
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