412 lines
12 KiB
C
412 lines
12 KiB
C
/****************************************************************************
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* libs/libc/net/lib_inetpton.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho
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* <minzkn@minzkn.com> which was released under the BSD license.
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*
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* Copyright (C) HWPORT.COM. All rights reserved.
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* Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If netdb support is enabled, then we need to be able to manage IPv4 and
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* IPv6 addresses, regardless of networking support.
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*/
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#ifdef CONFIG_NETDB_HOSTFILE
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# undef CONFIG_LIBC_IPv4_ADDRCONV
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# undef CONFIG_LIBC_IPv6_ADDRCONV
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# define CONFIG_LIBC_IPv4_ADDRCONV 1
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# define CONFIG_LIBC_IPv6_ADDRCONV 1
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: inet_ipv4_pton
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*
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* Description:
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* The inet_ipv4_pton() function converts an IPv4 address in its standard
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* text presentation form into its numeric binary form.
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*
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* Input Parameters:
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* src - The src argument points to the string being passed in.
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* dest - The dest argument points to a numstr into which the function
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* stores the numeric address; this must be large enough to hold the
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* numeric address (32 bits for AF_INET, 128 bits for AF_INET6).
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*
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* Returned Value:
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* inet_ipv4_pton() will returns 1 if the conversion succeeds. It will
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* return 0 if the input is not a valid IPv4 dotted-decimal string string.
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*
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****************************************************************************/
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#if defined(CONFIG_NET_IPv4) || defined(CONFIG_LIBC_IPv4_ADDRCONV)
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static int inet_ipv4_pton(FAR const char *src, FAR void *dest)
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{
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size_t srcoffset;
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size_t numoffset;
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int value;
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int ndots;
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uint8_t ch;
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char numstr[4];
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uint8_t *ip;
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memset(dest, 0, sizeof(struct in_addr));
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ip = (FAR uint8_t *)dest;
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srcoffset = 0;
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numoffset = 0;
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ndots = 0;
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for (; ; )
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{
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ch = (uint8_t)src[srcoffset++];
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if (ch == '.' || ch == '\0')
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{
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if (ch == '.' && ndots >= 4)
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{
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/* Too many dots */
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break;
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}
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if (numoffset < 1)
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{
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/* Empty numeric string */
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break;
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}
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numstr[numoffset] = '\0';
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numoffset = 0;
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value = atoi(numstr);
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if (value < 0 || value > 255)
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{
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/* Out of range value */
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break;
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}
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ip[ndots] = (uint8_t)value;
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if (ch == '\0')
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{
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if (ndots != 3)
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{
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/* Not enough dots */
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break;
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}
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/* Return 1 if the conversion succeeds */
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return 1;
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}
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ndots++;
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}
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else if (ch >= '0' && ch <= '9')
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{
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numstr[numoffset++] = ch;
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if (numoffset >= 4)
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{
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/* Number is too long */
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break;
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}
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}
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else
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{
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/* Illegal character */
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break;
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}
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}
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/* Return zero if there is any problem parsing the input */
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return 0;
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}
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#endif
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/****************************************************************************
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* Name: inet_ipv6_pton
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*
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* Description:
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* The inet_ipv6_pton() function converts an IPv6 address in its standard
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* text presentation form into its numeric binary form.
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*
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* Input Parameters:
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* src - The src argument points to the string being passed in.
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* dest - The dest argument points to a numstr into which the function
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* stores the numeric address; this must be large enough to hold the
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* numeric address (32 bits for AF_INET, 128 bits for AF_INET6).
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*
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* Returned Value:
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* inet_ipv6_pton() will returns 1 if the conversion succeeds. It will
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* return 0 if the input is not a valid IPv6 address string.
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*
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****************************************************************************/
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#if defined(CONFIG_NET_IPv6) || defined(CONFIG_LIBC_IPv6_ADDRCONV)
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static int inet_ipv6_pton(FAR const char *src, FAR void *dest)
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{
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size_t srcoffset;
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size_t numoffset;
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long value;
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int nsep;
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int nrsep;
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uint8_t ch;
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char numstr[5];
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uint8_t ip[sizeof(struct in6_addr)];
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uint8_t rip[sizeof(struct in6_addr)];
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bool rtime;
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memset(dest, 0, sizeof(struct in6_addr));
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srcoffset = 0;
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numoffset = 0;
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nsep = 0;
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nrsep = 0;
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rtime = false;
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for (; ; )
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{
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ch = (uint8_t)src[srcoffset++];
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if (ch == ':' || ch == '\0')
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{
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if (ch == ':' && (nsep + nrsep) >= 8)
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{
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/* Too many separators */
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break;
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}
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if (ch != '\0' && numoffset < 1)
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{
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/* Empty numeric string */
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if (rtime && nrsep > 1)
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{
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/* dup simple */
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break;
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}
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numoffset = 0;
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rtime = true;
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continue;
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}
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numstr[numoffset] = '\0';
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numoffset = 0;
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value = strtol(numstr, NULL, 16);
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if (value < 0 || value > 0xffff)
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{
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/* Out of range value */
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break;
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}
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if (!rtime)
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{
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ip[(nsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
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ip[(nsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
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nsep++;
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}
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else
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{
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rip[(nrsep << 1) + 0] = (uint8_t)((value >> 8) & 0xff);
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rip[(nrsep << 1) + 1] = (uint8_t)((value >> 0) & 0xff);
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nrsep++;
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}
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if (ch == '\0' /* || ch == '/' */)
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{
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if ((nsep <= 1 && nrsep <= 0) ||
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(nsep + nrsep) < 1 ||
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(nsep + nrsep) > 8)
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{
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/* Separator count problem */
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break;
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}
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if (nsep > 0)
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{
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memcpy(dest, &ip[0], nsep << 1);
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}
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if (nrsep > 0)
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{
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memcpy((FAR uint8_t *)dest +
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(16 - (nrsep << 1)), &rip[0], nrsep << 1);
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}
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/* Return 1 if the conversion succeeds */
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return 1;
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}
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}
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else if ((ch >= '0' && ch <= '9') ||
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(ch >= 'a' && ch <= 'f') ||
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(ch >= 'A' && ch <= 'F'))
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{
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numstr[numoffset++] = ch;
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if (numoffset >= 5)
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{
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/* Numeric string is too long */
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break;
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}
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}
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else
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{
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/* Illegal character */
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break;
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}
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}
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/* Return zero if there is any problem parsing the input */
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return 0;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: inet_pton
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*
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* Description:
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* The inet_pton() function converts an address in its standard text
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* presentation form into its numeric binary form.
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*
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* If the af argument of inet_pton() is AF_INET, the src string will be
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* in the standard IPv4 dotted-decimal form:
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*
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* ddd.ddd.ddd.ddd
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*
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* where "ddd" is a one to three digit decimal number between 0 and 255.
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*
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* If the af argument of inet_pton() is AF_INET6, the src string will be in
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* one of the following standard IPv6 text forms:
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*
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* 1. The preferred form is "x:x:x:x:x:x:x:x", where the 'x' s are the
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* hexadecimal values of the eight 16-bit pieces of the address. Leading
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* zeros in individual fields can be omitted, but there must be at least
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* one numeral in every field.
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*
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* 2. A string of contiguous zero fields in the preferred form can be shown
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* as "::". The "::" can only appear once in an address. Unspecified
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* addresses ( "0:0:0:0:0:0:0:0" ) may be represented simply as "::".
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*
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* 3. A third form that is sometimes more convenient when dealing with a
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* mixed environment of IPv4 and IPv6 nodes is "x:x:x:x:x:x:d.d.d.d",
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* where the 'x' s are the hexadecimal values of the six high-order
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* 16-bit pieces of the address, and the 'd' s are the decimal values
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* of the four low-order 8-bit pieces of the address (standard IPv4
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* representation).
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*
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* Input Parameters:
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* af - The af argument specifies the family of the address. This can be
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* AF_INET or AF_INET6.
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* src - The src argument points to the string being passed in.
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* dest - The dest argument points to memory into which the function stores
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* the numeric address; this must be large enough to hold the
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* numeric address (32 bits for AF_INET, 128 bits for AF_INET6).
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*
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* Returned Value:
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* The inet_pton() function returns 1 if the conversion succeeds, with the
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* address pointed to by dest in network byte order. It will return 0 if
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* the input is not a valid IPv4 dotted-decimal string or a valid IPv6
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* address string, or -1 with errno set to EAFNOSUPPORT if the af argument
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* is unknown.
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*
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****************************************************************************/
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int inet_pton(int af, FAR const char *src, FAR void *dest)
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{
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DEBUGASSERT(src && dest);
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/* Do the conversion according to the IP version */
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switch (af)
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{
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#if defined(CONFIG_NET_IPv4) || defined(CONFIG_LIBC_IPv4_ADDRCONV)
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case AF_INET:
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return inet_ipv4_pton(src, dest);
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#endif
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#if defined(CONFIG_NET_IPv6) || defined(CONFIG_LIBC_IPv6_ADDRCONV)
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case AF_INET6:
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return inet_ipv6_pton(src, dest);
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#endif
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default:
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set_errno(EAFNOSUPPORT);
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return ERROR;
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}
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}
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