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incubator-nuttx/libc/net/lib_inetpton.c

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/****************************************************************************
* libc/net/lib_inetpton.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho
* <minzkn@minzkn.com> which was released under the BSD license.
*
* Copyright (C) HWPORT.COM. All rights reserved.
* Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
*
* 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.
* 3. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netinet/in.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If netdb support is enabled, then we need to be able to manage IPv4 and
* IPv6 addresses, regardless of networking support.
*/
#ifdef CONFIG_NETDB_HOSTFILE
# undef CONFIG_NET_IPv4
# undef CONFIG_NET_IPv6
# define CONFIG_NET_IPv4 1
# define CONFIG_NET_IPv6 1
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: inet_ipv4_pton
*
* Description:
* The inet_ipv4_pton() function converts an IPv4 address in its standard
* text presentation form into its numeric binary form.
*
* Input Parameters:
* src - The src argument points to the string being passed in.
* dest - The dest argument points to a numstr into which the function stores
* the numeric address; this must be large enough to hold the numeric
* address (32 bits for AF_INET, 128 bits for AF_INET6).
*
* Returned Value:
* inet_ipv4_pton() will returns 1 if the conversion succeeds. It will
* return 0 if the input is not a valid IPv4 dotted-decimal string string.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static int inet_ipv4_pton(FAR const char *src, FAR void *dest)
{
size_t srcoffset;
size_t numoffset;
int value;
int ndots;
uint8_t ch;
char numstr[4];
uint8_t *ip;
(void)memset(dest, 0, sizeof(struct in_addr));
ip = (uint8_t *)dest;
srcoffset = 0;
numoffset = 0;
ndots = 0;
for (; ; )
{
ch = (uint8_t)src[srcoffset++];
if (ch == '.' || ch == '\0')
{
if (ch == '.' && ndots >= 4)
{
/* Too many dots */
break;
}
if (numoffset < 1)
{
/* Empty numeric string */
break;
}
numstr[numoffset] = '\0';
numoffset = 0;
value = atoi(numstr);
if (value < 0 || value > 255)
{
/* Out of range value */
break;
}
ip[ndots] = (uint8_t)value;
if (ch == '\0')
{
if (ndots != 3)
{
/* Not enough dots */
break;
}
/* Return 1 if the conversion succeeds */
return 1;
}
ndots++;
}
else if (ch >= '0' && ch <= '9')
{
numstr[numoffset++] = ch;
if (numoffset >= 4)
{
/* Number is too long */
break;
}
}
else
{
/* Illegal character */
break;
}
}
/* Return zero if there is any problem parsing the input */
return 0;
}
#endif
/****************************************************************************
* Name: inet_ipv6_pton
*
* Description:
* The inet_ipv6_pton() function converts an IPv6 address in its standard
* text presentation form into its numeric binary form.
*
* Input Parameters:
* src - The src argument points to the string being passed in.
* dest - The dest argument points to a numstr into which the function stores
* the numeric address; this must be large enough to hold the numeric
* address (32 bits for AF_INET, 128 bits for AF_INET6).
*
* Returned Value:
* inet_ipv6_pton() will returns 1 if the conversion succeeds. It will
* return 0 if the input is not a valid IPv6 address string.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static int inet_ipv6_pton(FAR const char *src, FAR void *dest)
{
size_t srcoffset;
size_t numoffset;
long value;
int nsep;
int nrsep;
uint8_t ch;
char numstr[5];
uint8_t ip[sizeof(struct in6_addr)];
uint8_t rip[sizeof(struct in6_addr)];
bool rtime;
(void)memset(dest, 0, sizeof(struct in6_addr));
srcoffset = 0;
numoffset = 0;
nsep = 0;
nrsep = 0;
rtime = false;
for (; ; )
{
ch = (uint8_t)src[srcoffset++];
if (ch == ':' || ch == '\0')
{
if (ch == ':' && (nsep + nrsep) >= 8)
{
/* Too many separators */
break;
}
if (ch != '\0' && numoffset < 1)
{
/* Empty numeric string */
if (rtime && nrsep > 1)
{
/* dup simple */
break;
}
numoffset = 0;
rtime = true;
continue;
}
numstr[numoffset] = '\0';
numoffset = 0;
value = strtol(numstr, NULL, 16);
if (value < 0 || value > 0xffff)
{
/* Out of range value */
break;
}
if (!rtime)
{
ip[(nsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
ip[(nsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
nsep++;
}
else
{
rip[(nrsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
rip[(nrsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
nrsep++;
}
if (ch == '\0' /* || ch == '/' */)
{
if ((nsep <= 1 && nrsep <= 0) ||
(nsep + nrsep) < 1 ||
(nsep + nrsep) > 8)
{
/* Separator count problem */
break;
}
if (nsep > 0)
{
memcpy(dest, &ip[0], nsep << 1);
}
if (nrsep > 0)
{
memcpy(dest + (16 - (nrsep << 1)), &rip[0], nrsep << 1);
}
/* Return 1 if the conversion succeeds */
return 1;
}
}
else if ((ch >= '0' && ch <= '9') ||
(ch >= 'a' && ch <= 'f') ||
(ch >= 'A' && ch <= 'F'))
{
numstr[numoffset++] = ch;
if (numoffset >= 5)
{
/* Numeric string is too long */
break;
}
}
else
{
/* Illegal character */
break;
}
}
/* Return zero if there is any problem parsing the input */
return 0;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: inet_pton
*
* Description:
* The inet_pton() function converts an address in its standard text
* presentation form into its numeric binary form.
*
* If the af argument of inet_pton() is AF_INET, the src string will be
* in the standard IPv4 dotted-decimal form:
*
* ddd.ddd.ddd.ddd
*
* where "ddd" is a one to three digit decimal number between 0 and 255.
*
* If the af argument of inet_pton() is AF_INET6, the src string will be in
* one of the following standard IPv6 text forms:
*
* 1. The preferred form is "x:x:x:x:x:x:x:x", where the 'x' s are the
* hexadecimal values of the eight 16-bit pieces of the address. Leading
* zeros in individual fields can be omitted, but there must be at least
* one numeral in every field.
*
* 2. A string of contiguous zero fields in the preferred form can be shown
* as "::". The "::" can only appear once in an address. Unspecified
* addresses ( "0:0:0:0:0:0:0:0" ) may be represented simply as "::".
*
* 3. A third form that is sometimes more convenient when dealing with a
* mixed environment of IPv4 and IPv6 nodes is "x:x:x:x:x:x:d.d.d.d",
* where the 'x' s are the hexadecimal values of the six high-order
* 16-bit pieces of the address, and the 'd' s are the decimal values
* of the four low-order 8-bit pieces of the address (standard IPv4
* representation).
*
* Input Parameters:
* af - The af argument specifies the family of the address. This can be
* AF_INET or AF_INET6.
* src - The src argument points to the string being passed in.
* dest - The dest argument points to memory into which the function stores
* the numeric address; this must be large enough to hold the numeric
* address (32 bits for AF_INET, 128 bits for AF_INET6).
*
* Returned Value:
* The inet_pton() function returns 1 if the conversion succeeds, with the
* address pointed to by dest in network byte order. It will return 0 if the
* input is not a valid IPv4 dotted-decimal string or a valid IPv6 address
* string, or -1 with errno set to EAFNOSUPPORT if the af argument is
* unknown.
*
****************************************************************************/
int inet_pton(int af, FAR const char *src, FAR void *dest)
{
DEBUGASSERT(src && dest);
/* Do the conversion according to the IP version */
switch (af)
{
#ifdef CONFIG_NET_IPv4
case AF_INET:
return inet_ipv4_pton(src, dest);
#endif
#ifdef CONFIG_NET_IPv6
case AF_INET6:
return inet_ipv6_pton(src, dest);
#endif
default:
set_errno(EAFNOSUPPORT);
return ERROR;
}
}
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