mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-20 22:10:04 +08:00
285 lines
11 KiB
C
285 lines
11 KiB
C
/*
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* FreeRTOS+TCP V4.3.0
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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_Callback.c
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* @brief File that handles the DNS Callback option
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*/
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#include "FreeRTOS_DNS_Callback.h"
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#include "FreeRTOS_IP.h"
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#include "FreeRTOS_IP_Private.h"
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#include "FreeRTOS_DNS_Globals.h"
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#include "FreeRTOS_IP_Timers.h"
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#if ( ( ipconfigDNS_USE_CALLBACKS == 1 ) && ( ipconfigUSE_DNS != 0 ) )
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/**
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* @brief list of callbacks to send
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*/
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static List_t xCallbackList;
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/**
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* @brief A DNS reply was received, see if there is any matching entry and
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* call the handler.
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*
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* @param[in,out] pxSet a set of variables that are shared among the helper functions.
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* @param[in] pxAddress Pointer to address info ( IPv4/IPv6 ) obtained from the DNS server.
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*
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* @return Returns pdTRUE if uxIdentifier was recognized.
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*/
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BaseType_t xDNSDoCallback( ParseSet_t * pxSet,
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struct freertos_addrinfo * pxAddress )
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{
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BaseType_t xResult = pdFALSE;
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const ListItem_t * pxIterator;
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const ListItem_t * xEnd = listGET_END_MARKER( &xCallbackList );
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TickType_t uxIdentifier = ( TickType_t ) pxSet->pxDNSMessageHeader->usIdentifier;
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/* While iterating through the list, the scheduler is suspended.
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* Remember which function shall be called once the scheduler is
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* running again. */
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FOnDNSEvent pCallbackFunction = NULL;
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void * pvSearchID = NULL;
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vTaskSuspendAll();
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{
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for( pxIterator = ( const ListItem_t * ) listGET_NEXT( xEnd );
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pxIterator != ( const ListItem_t * ) xEnd;
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pxIterator = ( const ListItem_t * ) listGET_NEXT( pxIterator ) )
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{
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BaseType_t xMatching;
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DNSCallback_t * pxCallback = ( ( DNSCallback_t * ) listGET_LIST_ITEM_OWNER( pxIterator ) );
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#if ( ipconfigUSE_MDNS == 1 )
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/* mDNS port 5353. Host byte order comparison. */
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if( pxSet->usPortNumber == ipMDNS_PORT )
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{
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/* In mDNS, the query ID field is ignored and the
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* hostname will be compared with outstanding requests. */
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xMatching = ( strcasecmp( pxCallback->pcName, pxSet->pcName ) == 0 ) ? pdTRUE : pdFALSE;
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}
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else
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#endif /* if ( ipconfigUSE_MDNS == 1 ) */
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{
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xMatching = ( listGET_LIST_ITEM_VALUE( pxIterator ) == uxIdentifier ) ? pdTRUE : pdFALSE;
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}
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if( xMatching == pdTRUE )
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{
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pvSearchID = pxCallback->pvSearchID;
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pCallbackFunction = pxCallback->pCallbackFunction;
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( void ) uxListRemove( &pxCallback->xListItem );
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vPortFree( pxCallback );
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if( listLIST_IS_EMPTY( &xCallbackList ) != pdFALSE )
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{
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/* The list of outstanding requests is empty. No need for periodic polling. */
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vIPSetDNSTimerEnableState( pdFALSE );
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}
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xResult = pdTRUE;
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break;
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}
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}
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}
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( void ) xTaskResumeAll();
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if( pCallbackFunction != NULL )
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{
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pCallbackFunction( pxSet->pcName, pvSearchID, pxAddress );
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}
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return xResult;
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}
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/**
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* @brief FreeRTOS_gethostbyname_a() was called along with callback parameters.
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* Store them in a list for later reference.
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*
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* @param[in] pcHostName The hostname whose IP address is being searched for.
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* @param[in] pvSearchID The search ID of the DNS callback function to set.
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* @param[in] pCallbackFunction The callback function pointer.
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* @param[in] uxTimeout Timeout of the callback function.
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* @param[in] uxIdentifier Random number used as ID in the DNS message.
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* @param[in] xIsIPv6 pdTRUE if the address type should be IPv6.
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*/
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BaseType_t xDNSSetCallBack( const char * pcHostName,
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void * pvSearchID,
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FOnDNSEvent pCallbackFunction,
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TickType_t uxTimeout,
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TickType_t uxIdentifier,
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BaseType_t xIsIPv6 )
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{
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BaseType_t xReturn = pdPASS;
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size_t lLength = strlen( pcHostName );
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/* MISRA Ref 4.12.1 [Use of dynamic memory]. */
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/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#directive-412. */
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/* coverity[misra_c_2012_directive_4_12_violation] */
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DNSCallback_t * pxCallback = ( ( DNSCallback_t * ) pvPortMalloc( sizeof( *pxCallback ) + lLength ) );
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/* Translate from ms to number of clock ticks. */
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uxTimeout /= portTICK_PERIOD_MS;
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if( pxCallback != NULL )
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{
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if( listLIST_IS_EMPTY( &xCallbackList ) != pdFALSE )
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{
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/* This is the first one, start the DNS timer to check for timeouts */
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vDNSTimerReload( FreeRTOS_min_uint32( 1000U, ( uint32_t ) uxTimeout ) );
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}
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( void ) strncpy( pxCallback->pcName, pcHostName, lLength + 1U );
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pxCallback->pCallbackFunction = pCallbackFunction;
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pxCallback->pvSearchID = pvSearchID;
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pxCallback->uxRemainingTime = uxTimeout;
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pxCallback->xIsIPv6 = xIsIPv6;
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vTaskSetTimeOutState( &( pxCallback->uxTimeoutState ) );
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listSET_LIST_ITEM_OWNER( &( pxCallback->xListItem ), ( void * ) pxCallback );
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listSET_LIST_ITEM_VALUE( &( pxCallback->xListItem ), uxIdentifier );
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vTaskSuspendAll();
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{
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vListInsertEnd( &xCallbackList, &pxCallback->xListItem );
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}
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( void ) xTaskResumeAll();
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}
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else
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{
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xReturn = pdFAIL;
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FreeRTOS_debug_printf( ( " xDNSSetCallBack : Could not allocate memory: %u bytes",
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( unsigned ) ( sizeof( *pxCallback ) + lLength ) ) );
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief Iterate through the list of call-back structures and remove
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* old entries which have reached a timeout.
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* As soon as the list has become empty, the DNS timer will be stopped.
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* In case pvSearchID is supplied, the user wants to cancel a DNS request.
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*
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* @param[in] pvSearchID The search ID of callback function whose associated
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* DNS request is being cancelled. If non-ID specific checking of
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* all requests is required, then this field should be kept as NULL.
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*/
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void vDNSCheckCallBack( void * pvSearchID )
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{
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const ListItem_t * pxIterator;
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const ListItem_t * xEnd = listGET_END_MARKER( &xCallbackList );
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/* When a DNS-search times out, the call-back function shall
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* be called. Store theses item in a temporary list.
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* Only when the scheduler is running, user functions
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* shall be called. */
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List_t xTempList;
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vListInitialise( &xTempList );
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vTaskSuspendAll();
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{
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for( pxIterator = ( const ListItem_t * ) listGET_NEXT( xEnd );
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pxIterator != xEnd; )
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{
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DNSCallback_t * pxCallback = ( ( DNSCallback_t * ) listGET_LIST_ITEM_OWNER( pxIterator ) );
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/* Move to the next item because we might remove this item */
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pxIterator = ( const ListItem_t * ) listGET_NEXT( pxIterator );
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if( ( pvSearchID != NULL ) && ( pvSearchID == pxCallback->pvSearchID ) )
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{
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( void ) uxListRemove( &( pxCallback->xListItem ) );
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vPortFree( pxCallback );
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}
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else if( xTaskCheckForTimeOut( &pxCallback->uxTimeoutState, &( pxCallback->uxRemainingTime ) ) != pdFALSE )
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{
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/* A time-out occurred in the asynchronous search.
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* Remove it from xCallbackList. */
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( void ) uxListRemove( &( pxCallback->xListItem ) );
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/* Insert it in a temporary list. The function will be called
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* once the scheduler is resumed. */
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vListInsertEnd( &( xTempList ), &pxCallback->xListItem );
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}
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else
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{
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/* This call-back is still waiting for a reply or a time-out. */
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}
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}
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}
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( void ) xTaskResumeAll();
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if( listLIST_IS_EMPTY( &xTempList ) == pdFALSE )
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{
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/* There is at least one item in xTempList which must be removed and deleted. */
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xEnd = listGET_END_MARKER( &xTempList );
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for( pxIterator = ( const ListItem_t * ) listGET_NEXT( xEnd );
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pxIterator != xEnd;
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)
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{
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DNSCallback_t * pxCallback = ( ( DNSCallback_t * ) listGET_LIST_ITEM_OWNER( pxIterator ) );
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/* Move to the next item because we might remove this item */
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pxIterator = ( const ListItem_t * ) listGET_NEXT( pxIterator );
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/* A time-out occurred in the asynchronous search.
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* Call the application hook with the proper information. */
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if( pxCallback->xIsIPv6 != 0 )
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{
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pxCallback->pCallbackFunction( pxCallback->pcName, pxCallback->pvSearchID, NULL );
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}
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else
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{
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pxCallback->pCallbackFunction( pxCallback->pcName, pxCallback->pvSearchID, 0U );
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}
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/* Remove it from 'xTempList' and free the memory. */
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( void ) uxListRemove( &( pxCallback->xListItem ) );
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vPortFree( pxCallback );
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}
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}
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if( listLIST_IS_EMPTY( &xCallbackList ) != pdFALSE )
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{
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vIPSetDNSTimerEnableState( pdFALSE );
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}
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}
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/*-----------------------------------------------------------*/
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/**
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* @brief initialize the cache
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* @post will modify global list xCallbackList
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*/
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void vDNSCallbackInitialise()
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{
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vListInitialise( &xCallbackList );
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}
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#endif /* if ( ipconfigDNS_USE_CALLBACKS == 1 ) */
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