natfw/natfwturnplugin/inc/natfwturnplugin.h
author hgs
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/*
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* Copyright (c) 2006 - 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:    Implements NAT Plug-in interface, which client uses to send
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*                TURN requests. Forwards client requests to Turn Connection
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*                Handler.
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*
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*/
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#ifndef C_NATFWTURNPLUGIN_H
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#define C_NATFWTURNPLUGIN_H
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#include <e32base.h>
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#include "natfwpluginapi.h"
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class CNATFWTurnConnectionHandler;
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/**
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 *  Implements NAT Plug-in interface
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 *
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 *  The client uses this interface to send TURN requests. Forwards
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 *  client requests to Turn Connection Handler.
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 *
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 *  @lib turnplugin.lib
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 *  @since S60 v3.2
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 */
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class CNATFWTurnPlugin : public CNATFWPluginApi
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    {
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public:
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    /**
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     * Creates a new instance of NAT FW TURN Plug-in class.
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     *
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     * @since S60 v3.2
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     * @param aInitParams Initial parameters that will be given to
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     *                    TURN Connection Handler class.
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     * @return A new instance, ownership is transferred.
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     */
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    static CNATFWTurnPlugin* NewL( TAny* aInitParams );
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    ~CNATFWTurnPlugin();
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    /**
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     * From CNATFWPluginApi.
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     * 
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     * Finds out a STUN Server and establishes a connection to it.
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     * 
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     * MNATFWPluginObserver::Notify is called with event code EServerConnected
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     * when connecting has completed.
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     *
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     * FetchCandidateL can be called after successful connecting.
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     *
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     * @since   S60 v3.2
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     * @param   aSocketServ         The handle to socket server session
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     * @param   aConnectionName     The unique name of the RConnection
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     */
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    void ConnectServerL( const RSocketServ& aSocketServ,
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        const TName& aConnectionName );
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    /**
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     * From CNATFWPluginApi.
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     *
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     * Fetches available candidates for a specified stream using given
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     * retransmission timeout for STUN transactions. 
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     * 
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     * RTO value 0 indicates default retransmission timeout as specified
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     * in STUN specification.
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     * 
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     * @since   S60 v3.2
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     * @param   aStreamId           Stream identifier
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     * @param   aRtoValue           Retransmission timeout in milliseconds
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     * @param   aAddrFamily         KAFUnspec / KAfInet / KAfInet6
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     * @leave   KErrNotSupported NAT Protocol plugin does not support
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     * operation.
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     */
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    void FetchCandidateL( TUint aStreamId, TUint aRtoValue,
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        TUint aAddrFamily );
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    /**
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     * From CNATFWPluginApi.
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     *
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     * Fetches available candidates for a specified stream using given
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     * retransmission timeout for STUN transactions. 
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     * 
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     * RTO value 0 indicates default retransmission timeout as specified
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     * in STUN specification.
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     * 
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     * Candidate is fetched using given base address as a local endpoint for
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     * a multiplexer connection.
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     * 
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     * @since   S60 v3.2
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     * @param   aStreamId           Stream identifier
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     * @param   aRtoValue           Retransmission timeout in milliseconds
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     * @param   aBaseAddr           Address from which to create connection
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     */
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    void FetchCandidateL( TUint aStreamId, TUint aRtoValue,
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        const TInetAddr& aBaseAddr );
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    /**
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     * From CNATFWPluginApi.
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     *
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     * Enables/disables media receiving for the specified local candidate.
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     * 
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     * Only those candidates given with MNATFWPluginObserver callbacks
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     * can be controlled. NATFW stream can have only one active candidate
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     * at a time. In other words, exactly one local candidate can be used
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     * for media delivery in receiving, sending or both directions.
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     * 
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     * MNATFWPluginObserver::Notify is called with event code
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     * EReceivingActivated/EReceivingDeactivated when status change has 
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     * completed. While activated incoming data is delivered to the media
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     * engine.
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     * 
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     * Receiving must be disabled prior to deleting plugin so that all
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     * resources can be freed.
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     * 
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     * Note: If TURN is used media cannot be delivered until remote address
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     * is known.
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     * 
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     * @since   S60 v3.2
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     * @pre     FetchCandidate(/s) and possible ICE processing have completed
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     * @param   aLocalCandidate The local end point for a media
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     * @param   aState          The receiving state
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     */
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    void SetReceivingStateL( const CNATFWCandidate& aLocalCandidate,
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        TNATFWStreamingState aState );
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    /**
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     * From CNATFWPluginApi.
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     *
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     * Enables/disables media sending from the specified local candidate.
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     * 
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     * Only those candidates given with MNATFWPluginObserver callbacks
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     * can be controlled. NATFW stream can have only one active candidate
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     * at a time. In other words, exactly one local candidate can be used
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     * for media delivery in receiving, sending or both directions.
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     * 
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     * Sending must be disabled prior to deleting plugin so that all
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     * resources can be freed.
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     * 
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     * MNATFWPluginObserver::Notify is called with event code
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     * ESendingActivated/ESendingDeactivated when status change has 
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     * completed. While activated outgoing data from media engine is delivered
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     * to the specified remote address.
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     * 
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     * @since   S60 v3.2
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     * @pre     FetchCandidate(/s) and possible ICE processing have completed
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     * @param   aLocalCandidate The local end point for a media
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     * @param   aState          The sending state
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     * @param   aDestAddr       The remote end point for a media
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     */
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    void SetSendingStateL( const CNATFWCandidate& aLocalCandidate, 
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        TNATFWStreamingState aState, const TInetAddr& aDestAddr );
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    /**
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     * From CNATFWPluginApi.
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     *
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     * Gets identifier for a connection that is associated with the
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     * given local end point.
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     *
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     * @since   S60 v3.2
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     * @param   aLocalCandidate     The local end point for a media
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     * @param   aConnectionId       Reference to found id
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     */
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    void GetConnectionIdL( const CNATFWCandidate& aLocalCandidate,
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        TUint& aConnectionId );
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    /**
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     * From CNATFWPluginApi.
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     * Get identifier of the plugin.
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     * 
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     * @since   S60 3.2
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     * @return  Identifier of the plugin
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     */
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    const TDesC8& PluginIdentifier() const;
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private:
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    CNATFWTurnPlugin();
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    void ConstructL( TAny* aInitParams );
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private: // data
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    /**
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     * Plugin identifier.
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     * Own.
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     */
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    HBufC8* iPluginId;
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    /**
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     * Handles connection related actions.
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     * Own.
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     */
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    CNATFWTurnConnectionHandler* iTurnConnectionHandler;
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    };
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#endif // C_NATFWTURNPLUGIN_H