[修改] 增加freeRTOS
1. 版本FreeRTOSv202212.01，命名为kernel；
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/*
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* FreeRTOS+TCP V3.1.0
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* Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://aws.amazon.com/freertos
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* http://www.FreeRTOS.org
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*/
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/**
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* @file FreeRTOS_DNS_Cache.c
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* @brief File that handles the DNS caching option
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*/
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_IP.h"
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#include "FreeRTOS_Sockets.h"
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#include "FreeRTOS_UDP_IP.h"
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#include "FreeRTOS_DHCP.h"
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#include "NetworkBufferManagement.h"
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#include "NetworkInterface.h"
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#include "FreeRTOS_DNS_Cache.h"
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#include "FreeRTOS_DNS_Globals.h"
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/* Standard includes. */
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#if ( ( ipconfigUSE_DNS != 0 ) && ( ipconfigUSE_DNS_CACHE == 1 ) )
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/**
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* @brief cache entry format structure
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*/
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typedef struct xDNS_CACHE_TABLE_ROW
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{
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uint32_t ulIPAddresses[ ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY ]; /*!< The IP address(es) of an ARP cache entry. */
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char pcName[ ipconfigDNS_CACHE_NAME_LENGTH ]; /*!< The name of the host */
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uint32_t ulTTL; /*!< Time-to-Live (in seconds) from the DNS server. */
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uint32_t ulTimeWhenAddedInSeconds; /*!< time at which the entry was added */
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#if ( ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY > 1 )
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uint8_t ucNumIPAddresses; /*!< number of ip addresses for the same entry */
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uint8_t ucCurrentIPAddress; /*!< current ip address index */
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#endif
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} DNSCacheRow_t;
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/*!
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* @brief DNS cache structure instantiation
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*/
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static DNSCacheRow_t xDNSCache[ ipconfigDNS_CACHE_ENTRIES ] = { 0x0 };
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/*!
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* @brief indicates the index of a free entry in the cache structure
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* \a DNSCacheRow_t
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*/
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static UBaseType_t uxFreeEntry = 0U;
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static BaseType_t prvFindEntryIndex( const char * pcName,
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UBaseType_t * uxResult );
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static BaseType_t prvGetCacheIPEntry( UBaseType_t uxIndex,
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uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds );
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static void prvUpdateCacheEntry( UBaseType_t uxIndex,
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uint32_t ulTTL,
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const uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds );
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static void prvInsertCacheEntry( const char * pcName,
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uint32_t ulTTL,
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const uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds );
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/**
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* @brief perform a dns lookup in the local cache
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* @param pcHostName the lookup name
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* @return ulIPAddress with the value from the cache else returns a zero if the
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* cache is not enabled or the lookup is not successful
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* @post the global structure \a xDNSCache might be modified
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*/
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uint32_t FreeRTOS_dnslookup( const char * pcHostName )
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{
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uint32_t ulIPAddress = 0U;
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( void ) FreeRTOS_ProcessDNSCache( pcHostName,
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&ulIPAddress,
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0,
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pdTRUE );
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return ulIPAddress;
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}
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/**
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* @brief perform a dns update in the local cache
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* @param pcName the lookup name
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* @param pulIP the ip value to insert/replace
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* @param ulTTL Time To live (in seconds)
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* @return this is a dummy return, we are actually ignoring the return value
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* from this function
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* @post the global structure \a xDNSCache might be modified
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*/
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BaseType_t FreeRTOS_dns_update( const char * pcName,
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uint32_t * pulIP,
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uint32_t ulTTL )
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{
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( void ) FreeRTOS_ProcessDNSCache( pcName,
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pulIP,
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ulTTL,
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pdFALSE );
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return pdTRUE;
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}
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/**
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* @brief perform a dns clear in the local cache
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* @post the global structure \a xDNSCache is modified
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*/
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void FreeRTOS_dnsclear( void )
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{
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( void ) memset( xDNSCache, 0x0, sizeof( xDNSCache ) );
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uxFreeEntry = 0U;
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}
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/**
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* @brief process a DNS Cache request (get, update, or insert)
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*
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* @param[in] pcName: the name of the host
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* @param[in,out] pulIP: when doing a lookup, will be set, when doing an update,
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* will be read.
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* @param[in] ulTTL: Time To Live (in seconds)
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* @param[in] xLookUp: pdTRUE if a look-up is expected, pdFALSE, when the DNS cache must
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* be updated.
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* @return whether the operation was successful
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* @post the global structure \a xDNSCache might be modified
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*/
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BaseType_t FreeRTOS_ProcessDNSCache( const char * pcName,
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uint32_t * pulIP,
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uint32_t ulTTL,
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BaseType_t xLookUp )
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{
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UBaseType_t uxIndex;
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BaseType_t xResult;
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TickType_t xCurrentTickCount = xTaskGetTickCount();
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uint32_t ulCurrentTimeSeconds;
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configASSERT( ( pcName != NULL ) );
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ulCurrentTimeSeconds = ( xCurrentTickCount / portTICK_PERIOD_MS ) / 1000U;
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xResult = prvFindEntryIndex( pcName, &uxIndex );
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if( xResult == pdTRUE )
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{ /* Element found */
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if( xLookUp == pdTRUE )
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{
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/* This statement can only be reached when xResult is true; which
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* implies that the entry is present and a 'get' operation will result
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* in success. Therefore, it is safe to ignore the return value of the
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* below function. */
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( void ) prvGetCacheIPEntry( uxIndex,
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pulIP,
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ulCurrentTimeSeconds );
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}
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else
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{
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prvUpdateCacheEntry( uxIndex,
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ulTTL,
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pulIP,
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ulCurrentTimeSeconds );
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}
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}
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else /* Element not Found xResult = pdFALSE */
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{
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if( xLookUp == pdTRUE )
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{
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*pulIP = 0U;
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}
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else
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{
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prvInsertCacheEntry( pcName,
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ulTTL,
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pulIP,
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ulCurrentTimeSeconds );
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}
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}
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if( ( xLookUp == pdFALSE ) || ( *pulIP != 0U ) )
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{
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FreeRTOS_debug_printf( ( "FreeRTOS_ProcessDNSCache: %s: '%s' @ %xip (TTL %u)\n",
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( xLookUp != 0 ) ? "look-up" : "add",
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pcName,
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( unsigned ) FreeRTOS_ntohl( *pulIP ),
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( unsigned ) FreeRTOS_ntohl( ulTTL ) ) );
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}
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return xResult;
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}
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/**
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* @brief returns the index of the hostname entry in the dns cache.
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* @param[in] pcName find it in the cache
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* @param [out] xResult index number
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* @returns res pdTRUE if index in found else pdFALSE
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*/
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static BaseType_t prvFindEntryIndex( const char * pcName,
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UBaseType_t * uxResult )
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{
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BaseType_t xReturn = pdFALSE;
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UBaseType_t uxIndex;
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/* For each entry in the DNS cache table. */
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for( uxIndex = 0; uxIndex < ipconfigDNS_CACHE_ENTRIES; uxIndex++ )
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{
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if( xDNSCache[ uxIndex ].pcName[ 0 ] == ( char ) 0 )
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{ /* empty slot */
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continue;
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}
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if( strcmp( xDNSCache[ uxIndex ].pcName, pcName ) == 0 )
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{ /* hostname found */
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xReturn = pdTRUE;
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*uxResult = uxIndex;
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break;
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}
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}
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return xReturn;
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}
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/**
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* @brief get entry at \p index from the cache
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* @param[in] uxIndex : index in the cache
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* @param[out] pulIP fill it with the result
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* @param[in] ulCurrentTimeSeconds current time
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* @returns \c pdTRUE if the value is valid \c pdFALSE otherwise
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* @post the global structure \a xDNSCache might be modified
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*
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*/
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static BaseType_t prvGetCacheIPEntry( UBaseType_t uxIndex,
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uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds )
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{
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BaseType_t isRead;
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uint32_t ulIPAddressIndex = 0;
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uint32_t ulAge = ulCurrentTimeSeconds - xDNSCache[ uxIndex ].ulTimeWhenAddedInSeconds;
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/* Confirm that the record is still fresh.
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* The field ulTTL was stored as network-endian. */
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if( ulAge < FreeRTOS_ntohl( xDNSCache[ uxIndex ].ulTTL ) )
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{
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#if ( ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY > 1 )
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uint8_t ucIndex;
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/* The ucCurrentIPAddress value increments without bound and will rollover, */
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/* modulo it by the number of IP addresses to keep it in range. */
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/* Also perform a final modulo by the max number of IP addresses */
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/* per DNS cache entry to prevent out-of-bounds access in the event */
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/* that ucNumIPAddresses has been corrupted. */
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ucIndex = xDNSCache[ uxIndex ].ucCurrentIPAddress % xDNSCache[ uxIndex ].ucNumIPAddresses;
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ucIndex = ucIndex % ( uint8_t ) ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY;
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ulIPAddressIndex = ucIndex;
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xDNSCache[ uxIndex ].ucCurrentIPAddress++;
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#endif /* if ( ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY > 1 ) */
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*pulIP = xDNSCache[ uxIndex ].ulIPAddresses[ ulIPAddressIndex ];
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isRead = pdTRUE;
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}
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else
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{
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/* Age out the old cached record. */
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xDNSCache[ uxIndex ].pcName[ 0 ] = ( char ) 0;
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isRead = pdFALSE;
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}
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return isRead;
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}
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/**
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* @brief update entry at \p index in the cache
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* @param[in] uxIndex : index in the cache
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* @param[in] ulTTL time to live (in seconds)
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* @param[in] pulIP ip to update the cache with
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* @param[in] ulCurrentTimeSeconds current time
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* @post the global structure \a xDNSCache is modified
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*
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*/
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static void prvUpdateCacheEntry( UBaseType_t uxIndex,
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uint32_t ulTTL,
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const uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds )
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{
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uint32_t ulIPAddressIndex = 0;
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#if ( ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY > 1 )
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if( xDNSCache[ uxIndex ].ucNumIPAddresses <
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( uint8_t ) ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY )
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{
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/* If more answers exist than there are IP address storage
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* slots they will overwrite entry 0 */
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ulIPAddressIndex = xDNSCache[ uxIndex ].ucNumIPAddresses;
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xDNSCache[ uxIndex ].ucNumIPAddresses++;
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}
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#endif
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xDNSCache[ uxIndex ].ulIPAddresses[ ulIPAddressIndex ] = *pulIP;
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xDNSCache[ uxIndex ].ulTTL = ulTTL;
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xDNSCache[ uxIndex ].ulTimeWhenAddedInSeconds = ulCurrentTimeSeconds;
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}
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/**
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* @brief insert entry in the cache
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* @param[in] pcName cache entry key
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* @param[in] ulTTL time to live (in seconds)
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* @param[in] pulIP ip address
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* @param[in] ulCurrentTimeSeconds current time
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* @post the global structure \a xDNSCache is modified
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*/
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static void prvInsertCacheEntry( const char * pcName,
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uint32_t ulTTL,
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const uint32_t * pulIP,
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uint32_t ulCurrentTimeSeconds )
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{
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/* Add or update the item. */
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if( strlen( pcName ) < ( size_t ) ipconfigDNS_CACHE_NAME_LENGTH )
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{
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( void ) strcpy( xDNSCache[ uxFreeEntry ].pcName, pcName );
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xDNSCache[ uxFreeEntry ].ulIPAddresses[ 0 ] = *pulIP;
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xDNSCache[ uxFreeEntry ].ulTTL = ulTTL;
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xDNSCache[ uxFreeEntry ].ulTimeWhenAddedInSeconds = ulCurrentTimeSeconds;
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#if ( ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY > 1 )
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xDNSCache[ uxFreeEntry ].ucNumIPAddresses = 1;
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xDNSCache[ uxFreeEntry ].ucCurrentIPAddress = 0;
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/* Initialize all remaining IP addresses in this entry to 0 */
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( void ) memset( &xDNSCache[ uxFreeEntry ].ulIPAddresses[ 1 ],
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0,
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sizeof( xDNSCache[ uxFreeEntry ].ulIPAddresses[ 1 ] ) *
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( ( uint32_t ) ipconfigDNS_CACHE_ADDRESSES_PER_ENTRY - 1U ) );
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#endif
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uxFreeEntry++;
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if( uxFreeEntry == ipconfigDNS_CACHE_ENTRIES )
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{
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uxFreeEntry = 0;
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}
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}
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}
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#endif /* if ( ( ipconfigUSE_DNS != 0 ) && ( ipconfigUSE_DNS_CACHE == 1 ) ) */
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