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/*
* 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
static int inet_pton4 (const char *src, unsigned char *dst);
static int inet_pton6 (const char *src, unsigned char *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 *src, void *dst)
{
switch (af)
{
case AF_INET:
return inet_pton4 (src, dst);
case AF_INET6:
return inet_pton6 (src, dst);
default:
__set_errno (EAFNOSUPPORT);
return -1;
}
}
libc_hidden_def (__inet_pton)
weak_alias (__inet_pton, inet_pton)
libc_hidden_weak (inet_pton)
/* Like inet_atonbut without all the hexadecimal, octal 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 *src, unsigned char *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 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;
}
/* Cconvert 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 *src, unsigned char *dst)
{
static const char xdigits[] = "0123456789abcdef";
unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
const char *curtok;
int ch, saw_xdigit;
unsigned int 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 = 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++ = (unsigned char) (val >> 8) & 0xff;
*tp++ = (unsigned 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++ = (unsigned char) (val >> 8) & 0xff;
*tp++ = (unsigned 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;
}
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