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/* Copyright (C) 1996-2018 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
<http://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 <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <netinet/in.h>
#include <resolv/resolv-internal.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
static int inet_pton4 (const char *src, const char *src_end, u_char *dst);
static int inet_pton6 (const char *src, const char *src_end, u_char *dst);
int
__inet_pton_length (int af, const char *src, size_t srclen, void *dst)
{
switch (af)
{
case AF_INET:
return inet_pton4 (src, src + srclen, dst);
case AF_INET6:
return inet_pton6 (src, src + srclen, dst);
default:
__set_errno (EAFNOSUPPORT);
return -1;
}
}
libc_hidden_def (__inet_pton_length)
/* Like __inet_pton_length, but use strlen (SRC) as the length of
SRC. */
int
__inet_pton (int af, const char *src, void *dst)
{
return __inet_pton_length (af, src, strlen (src), dst);
}
libc_hidden_def (__inet_pton)
weak_alias (__inet_pton, inet_pton)
libc_hidden_weak (inet_pton)
/* Like inet_aton but without all the hexadecimal, octal and shorthand
(and trailing garbage is not ignored). Return 1 if SRC is a valid
dotted quad, else 0. This function does not touch DST unless it's
returning 1.
Author: Paul Vixie, 1996. */
static int
inet_pton4 (const char *src, const char *end, unsigned char *dst)
{
int saw_digit, octets, ch;
unsigned char tmp[NS_INADDRSZ], *tp;
saw_digit = 0;
octets = 0;
*(tp = tmp) = 0;
while (src < end)
{
ch = *src++;
if (ch >= '0' && ch <= '9')
{
unsigned int 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;
}
/* Return the value of CH as a hexademical digit, or -1 if it is a
different type of character. */
static int
hex_digit_value (char ch)
{
if ('0' <= ch && ch <= '9')
return ch - '0';
if ('a' <= ch && ch <= 'f')
return ch - 'a' + 10;
if ('A' <= ch && ch <= 'F')
return ch - 'A' + 10;
return -1;
}
/* Convert presentation-level IPv6 address to network order binary
form. Return 1 if SRC is a valid [RFC1884 2.2] address, else 0.
This function does not touch DST unless it's returning 1.
Author: Paul Vixie, 1996. Inspired by Mark Andrews. */
static int
inet_pton6 (const char *src, const char *src_endp, unsigned char *dst)
{
unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
const char *curtok;
int ch;
size_t xdigits_seen; /* Number of hex digits since colon. */
unsigned int val;
tp = memset (tmp, '\0', NS_IN6ADDRSZ);
endp = tp + NS_IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if (src == src_endp)
return 0;
if (*src == ':')
{
++src;
if (src == src_endp || *src != ':')
return 0;
}
curtok = src;
xdigits_seen = 0;
val = 0;
while (src < src_endp)
{
ch = *src++;
int digit = hex_digit_value (ch);
if (digit >= 0)
{
if (xdigits_seen == 4)
return 0;
val <<= 4;
val |= digit;
if (val > 0xffff)
return 0;
++xdigits_seen;
continue;
}
if (ch == ':')
{
curtok = src;
if (xdigits_seen == 0)
{
if (colonp)
return 0;
colonp = tp;
continue;
}
else if (src == src_endp)
return 0;
if (tp + NS_INT16SZ > endp)
return 0;
*tp++ = (unsigned char) (val >> 8) & 0xff;
*tp++ = (unsigned char) val & 0xff;
xdigits_seen = 0;
val = 0;
continue;
}
if (ch == '.' && ((tp + NS_INADDRSZ) <= endp)
&& inet_pton4 (curtok, src_endp, tp) > 0)
{
tp += NS_INADDRSZ;
xdigits_seen = 0;
break; /* '\0' was seen by inet_pton4. */
}
return 0;
}
if (xdigits_seen > 0)
{
if (tp + NS_INT16SZ > endp)
return 0;
*tp++ = (unsigned char) (val >> 8) & 0xff;
*tp++ = (unsigned char) val & 0xff;
}
if (colonp != NULL)
{
/* Replace :: with zeros. */
if (tp == endp)
/* :: would expand to a zero-width field. */
return 0;
size_t n = tp - colonp;
memmove (endp - n, colonp, n);
memset (colonp, 0, endp - n - colonp);
tp = endp;
}
if (tp != endp)
return 0;
memcpy (dst, tmp, NS_IN6ADDRSZ);
return 1;
}
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