//dnsproxymessageproc.h

/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

* dnsproxymessageproc.h - Dns Proxy message processor

* @file

* @internalTechnology

*

*/

#ifndef _DNSPROXY_MESSAGE_PROCESSOR_H__

#define _DNSPROXY_MESSAGE_PROCESSOR_H__

#include <e32base.h>

#include <es_sock.h>

#include "in_sock.h" 

#include "dnsproxydb.h"

#include "message.h"

_LIT(KPTRSUFFIX,"in-addr.arpa");

const TInt KPTRSufix = 50;

const TInt KPTR		 = 50;

class CDnsProxyListener;

class CDnsProxyMessageProcessor: public CBase

/*

* This class constructs the response packet.

* For constructing the response packet, it will extract the 

* query packets from the queue,  then constructs the packt.

* After constructing the response packet, it will send the constructed

* packet back to write class for sending it to querying hosts.

*

* @internalTechnology

*/

	{

		friend class TDnsProxyNsRecord;

	public:

		static CDnsProxyMessageProcessor* NewL(CDnsProxyListener& aListener);

		~CDnsProxyMessageProcessor();

		//constructors the DNS response

		void GetLocalDnsResponseL(TMsgBuf &msgbuf);

		//finds the suffix of the query name

		TInt GetQNameSuffixL(TMsgBuf& aMsg);

		TDnsProxydbElement* LookupPTRInDb(TMsgBuf& aMsg);

		void GetDnsFailureMessage(TMsgBuf& aMsgBuf);		

	private:

	    //constructor

		CDnsProxyMessageProcessor(CDnsProxyListener& aListener);

		//destructor

		void GetRecordsFromDb(TMsgBuf& aMsg,TDnsProxydbElement& aElement);

		void SetQHeaderBits(TDndHeader &aHdr);

		//constructs the ANRData as specified in RFC1035 sect4.1.3

		void GetAnRecordSet(TMsgBuf& aQMsg,TDnsProxydbElement& aElement);

		//constructs the NSRdata as specified in RFC1035 section 3.3.13

		void GetNsRecordSetL(TMsgBuf& aQMsg);

		void GetPTRRecord(TMsgBuf& aMsg,const TDesC8& aName);	

	private:

		CDnsProxyListener&  iListener;

		TInt 				iAntype;

	};

class TDnsProxyNsRecord 

/*

* This class is used for constructing authoritative answer record set

*

* @internalTechnology

*/

	{

	public:

		TDesC8& CreateNSResourceRecord(const TDesC8& aMsg);

		void ResetBuffer();

	private:

		void AppendRRLength(const TDesC8& aMsg);

		void AppendTTLBuf();

	public:

		TUint16 	iQType;

		TUint16		iCType;

		TUint32 	iTTL; 

		TUint32 	iSerialNum;

		TUint32 	iRefreshTime;

		TUint32 	iRetryTime;

		TUint32 	iExpiretime;

		TBuf8<KDnsMaxMessage>  iNSBuf;

	};

#endif/*_DNSPROXY_MESSAGE_PROCESSOR_H__*/