multimediacommsengine/mmcesrv/mmcemediamanager/inc/mcesecuremediasession.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 09 Jun 2010 10:06:41 +0300
branchRCL_3
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:    Provides services for SDP Security Descriptions.
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*
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*/
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#ifndef CMCESECUREMEDIASESSION_H
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#define CMCESECUREMEDIASESSION_H
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//  INCLUDES
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#include <e32base.h>
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#include <e32cmn.h>
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#include <e32std.h> 
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#include <in_sock.h>
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#include <stringpool.h>
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#include "mcemediadefs.h"
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#include "mcesrv.h"
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#include "mcecomsession.h"
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// FORWARD DECLARATIONS
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class CSdpDocument;
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class CMceComSession;
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class CMceComAudioStream;
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class CSdpMediaField;
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class CMceMediaManager;
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class CMceSdpCodec;
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class CMceSecureDesStream;
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class CMccSecureInterface;
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class CMceSrvStream;
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class CMceComCodec;
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class CMceComMediaStream;
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/*enum TSecStreamCryptoType
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		{
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		E_CryptoIn =1,
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		E_CryptoOut 
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		};	    
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*/
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const TUint KCyptoCountSendRecv = 2;
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const TUint KCyptoCountSendOrRecv = 1;
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/**
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*  Class for storing session specific SDP parameters
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*/
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class CMceSecureMediaSession : public CBase
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        */
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        static CMceSecureMediaSession* NewL( CMceComSession& aSession,
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                                     CMceMediaManager& aManager,
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                                     CMccSecureInterface& aSecureInterface );
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        /**
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        * Two-phased constructor.
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        */
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        static CMceSecureMediaSession* NewLC( CMceComSession& aSession,
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                                      CMceMediaManager& aManager,
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                                      CMccSecureInterface& aSecureInterface  );
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        /**
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        * Destructor.
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        */
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        ~CMceSecureMediaSession();
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    public: 
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        /**
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        * Createas a SDPDocument based on the streams in iSession. For each stream
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        * a media line is created in the sdp document. Fails if one of the streams 
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        * is not supported / failed
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return KErrNone if successful, otherwise failed
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        */
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        void EncodeSecureDesSdpOfferL(	CMceComMediaStream& aStream,
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        								CSdpMediaField& aMediaLine);
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        /**
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        * Goes through the secure line from answer and store the secure keys information 
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return void 
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        */
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        void  DecodeSecureDesSdpAnswerL(	CMceComMediaStream& aStream,
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        									CSdpMediaField& aMediaLine); 
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        /**
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        * Decodes the incoming offer. For each media line in the offer, create corresponding
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        * secure stream and secure keys information
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return void
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        */
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        void DecodeSecureDesSdpOfferL( CMceComMediaStream& aStream,
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        								CSdpMediaField& aMediaLine);
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        /**
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        * Creates an answer based on the OFFER received and the application's
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        * updated preferences. 
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return void   
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        */
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        void EncodeSecureDesSdpAnswerL( CMceComMediaStream& aStream,
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        								CSdpMediaField& aMediaLine); 
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        /**
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        * Decodes an medialine based on the OFFER received and the application's
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        * updated preferences. 
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return void    
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        */
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        void DecodeSecureDesSdpUpdateL( CMceComMediaStream& aStream,
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        								CSdpMediaField& aMediaLine );
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        /**
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        * Cleans secure crypto information in SdpDocuemnt MediaLine 
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        * @param aStream a MceComMediaStream
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        * @param aMediaLine
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        * @return void
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        */ 
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        void CleanSecureCryptoInfoL(CSdpMediaField& aMediaLine);
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        /**
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	     * Binds crypto context into stream. Binding must be done
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	     * before stream is prepared.
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	     * @since Series 60 3.2
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	     * @return KErrNone if success; otherwise system wide error code.
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	     */
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 		 TInt BindStreamCrypto();
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 		 /**
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	     * Set stream to be updated when MccEvent called back 
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	     * @since Series 60 3.2
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	     * @param aContextId context needed to be updated
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	     * @return KErrNone if success; otherwise system wide error code.
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	     */
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 		void ContextNeedUpdated( TUint32 aContextId );
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     	/**
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	     * Copy secure description streams into new secure media session
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	     * @since Series 60 3.2
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	     * @param aSession a secure media session to be copied from
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	     * @return void
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	     */
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     	void CopyStreamsL(CMceSecureMediaSession& aSession);
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     	TInt SdpCryptoAttributeCount( CSdpMediaField& aMediaLine);
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     	void RemoveSecureCrypto();
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3
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     	void ForceUpdateSecureStreamL( CMceComMediaStream& aStream, 
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     			                       CSdpMediaField& aMediaLine );
0
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    private:
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL();
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        /**
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        * C++ default constructor
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        */
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        CMceSecureMediaSession( CMceComSession& aSession, 
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        						CMceMediaManager& aManager,
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                                CMccSecureInterface& aSecureInterface);
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        TBool IfStreamMatchMedia(CMceComMediaStream& aMediaStream,
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        								CMceSecureDesStream& aStream,
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													CSdpMediaField& aMediaLine);                        
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    	TBool IsSecureSdpMsgL( CSdpMediaField& aMediaLine );
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    public:    // Data
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        CMceMediaManager& iManager;
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        // reference to corresponding server stream
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        CMceComSession& iSession;
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        CMccSecureInterface& iSecureInterface;
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        TBool iKeyNeedUpdated;
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        TBool iCryptoContextUpdate;
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        TBool iLSReadyToBind;
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        TBool iNatBind;
0
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    private:
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        RStringPool iStringPool;
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        const TStringTable* iStringTable;
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        RPointerArray< CMceSecureDesStream > iMceSecureDesStreams;
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    	//definitions for unit testing
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    	MCEMM_UT_DEFINITIONS
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     	friend class UT_CMceSecureMediaSession; 
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    };
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#endif      // CMCESECUREMEDIASESSION_H
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// End of File