1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // This class constructs the DNS response packet and sends it back to

    15 // querying hosts. After sending the DNS query response to querying hosts,

    16 // DNS writer checks if there is anything pending in the queue which needs

    17 // to be send back to the querying host.Once done it deletes the completed

    18 // query context from the queue. This is dervied from CActive.

    19 //

    20 

    21 

    22 

    23 /**

    24  @file

    25  @internalTechnology

    26 */

    27 #include "inet6log.h"

    28 #include <cflog.h>

    29 #include "dnsproxylistener.h"

    30 #include "dnsproxywriter.h"

    31 

    32 CDnsProxyWriter* CDnsProxyWriter::NewL(CDnsProxyListener& aListener)

    33 /**

    34  * This method creates an instance of CDnsProxyWriter.

    35  * @param aListener - Reference of the listener object

    36  * @return - Pointer to class instance

    37  *

    38  * @internalTechnology

    39  **/

    40 	{

    41     CDnsProxyWriter*writer = new(ELeave)CDnsProxyWriter(aListener);

    42 	return writer;

    43 	}

    44 

    45 CDnsProxyWriter::CDnsProxyWriter(CDnsProxyListener& aListener):CActive(EPriorityStandard),iListener(aListener)

    46 /**

    47  * This is constructor for CDnsProxyWriter.It adds itself to CActive scheduler.

    48  * @param aListener - Reference of the listener object

    49  * @return - None

    50  *

    51  * @internalTechnology

    52  **/

    53 

    54 	{

    55 	CActiveScheduler::Add(this);

    56 	}

    57 

    58 void CDnsProxyWriter::ConstructL()

    59 /**

    60  * Second phase construction

    61  * @param -None

    62  * @return -None

    63  *

    64  * @internalTechnology

    65  **/

    66 

    67 	{

    68 	}

    69 

    70 CDnsProxyWriter::~CDnsProxyWriter()

    71 /**

    72  * This is destructor for CDnsProxyWriter.It cancels any pending requests.

    73  * @param -None

    74  * @return -None

    75  *

    76  * @internalTechnology

    77  **/

    78 

    79 	{

    80     Cancel();

    81 	}

    82 

    83 void CDnsProxyWriter::RunL()

    84 /**

    85  * This method implements RunL method of this active object.It deletes all the completed queries

    86  * and processes the next resolved query. That is, query whose state is EResolved.

    87  *

    88  * @param - None

    89  * @return - None

    90  *

    91  * @internalTechnology

    92  **/

    93 

    94 	{

    95 		//delete the completed messages

    96 		TInt index = 0;

    97 		TQueryContext *qCtx = NULL;

    98 

    99 		while(iListener.iQueryContext.Count() > index)

   100 			{

   101 			TQueryState queryState = iListener.iQueryContext[index]->GetQueryState();

   102 			TQueryContext *qCtx = iListener.GetQCtxFromList(EQueryDone);

   103 			if(qCtx)

   104 				{

   105 				iListener.DeleteQCtxFromListL(qCtx);

   106 				qCtx = NULL;

   107 				}

   108             index++;

   109 			}

   110 			

   111 		qCtx = iListener.GetQCtxFromList(EResolved);

   112 		if(qCtx)

   113 			{

   114 			WriteTo(qCtx);

   115 			}

   116 	}

   117 

   118 void CDnsProxyWriter::DoCancel()

   119 /**

   120  * This method cancels outstanding write request.

   121  * @param - None

   122  * @return - None

   123  *

   124  * @internalTechnology

   125  **/

   126 

   127 	{

   128 	iListener.iListenerSocket.CancelSend();

   129 	}

   130 

   131 void CDnsProxyWriter::WriteTo(TQueryContext* aQueryContext)

   132 /**

   133  * This method gets DNS response from query context and sends it to the querying host.

   134  * @param queryContext - Pointer to the query context

   135  * @return - None

   136  *

   137  * @internalTechnology

   138  **/

   139 	{

   140 	if(IsActive())

   141 		return;

   142 	

   143 	TPtrC8 msg = aQueryContext->GetDnsReplyMessage();

   144 	addr = aQueryContext->GetSourceAddr();

   145 	aQueryContext->SetQueryState(EQueryDone);

   146 

   147 	iListener.iListenerSocket.SendTo(msg,aQueryContext->GetSourceAddr(),0,iStatus);

   148 	SetActive();

   149 	}

   150 

   151 TInt CDnsProxyWriter::RunError(TInt /*aErr*/)

   152 /**

   153  * This method implements RunError method of an active object. This helps in debugging.

   154  * @param aErr - Error code

   155  * @return - Error code

   156  *

   157  * @internalTechnology

   158  **/

   159 	{

   160 	iListener.DeleteAllQCtxFromList();

   161 	return KErrNone;

   162 	}