// Copyright (c) 2004-2009 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:

// Implementation of CSBEServer class.

// 

//

/**

 @file

*/

#include <e32std.h>

#include <e32base.h>

#include "sbeclientserver.h"

#include "sbeserver.h"

#include "sbesession.h"

#include "sbepanic.h"

#include "sbedataownermanager.h"

#include "sblog.h"

//#include <stdlib.h>

namespace conn

	{

	/** Secure Backup Engine security request ranges

	This is a breakdown of the SBE requests into ranges

	for security checking purposes.

	@internalComponent

	*/

	const TInt mySBERanges[] = {0,23};

	/** Secure Backup Engine range count

	The number of different security ranges for SBEs request numbers

	@internalComponent

	*/

	const TUint mySBERangeCount = sizeof(mySBERanges)/sizeof(mySBERanges[0]);

	/** Secure Backup Engine security action array

	An array with a one-to-one mapping with the range array

	specifiying what security action to take for each server request.

	@internalComponent

	*/

	const TUint8 mySBEElementsIndex[mySBERangeCount] =

		{

		0,

		CPolicyServer::ENotSupported,

		};

	/**

	@internalComponent

	*/

	const CPolicyServer::TPolicyElement mySBEElements[] =

		{

			{_INIT_SECURITY_POLICY_C2(ECapabilityWriteDeviceData,ECapabilityReadDeviceData)

				, CPolicyServer::EFailClient},

		};

	/**

	@internalComponent

	*/

	const CPolicyServer::TPolicy mySBEPolicy =

		{

		0,

		mySBERangeCount,

		mySBERanges,

		mySBEElementsIndex,

		mySBEElements,

		};

	CSBEServer::CSBEServer(CDataOwnerManager* aDOM)

		: CPolicyServer(EPriorityNormal,mySBEPolicy), iDOM(aDOM)

    /** 

    Class constructor

    */

		{

		__ASSERT_DEBUG(aDOM, Panic(KErrArgument));

		}

	CSBEServer::~CSBEServer()

    /**

    Class destructor

    */

		{

		iGlobalSharedHeap.Close();

		delete iGSHInterface;

		}

	CSBEServer* CSBEServer::NewLC(CDataOwnerManager* aDOM)

	/**

	Constructs a new instance of the CSBEServer, calls ConstructL, 

	and returns it to the caller leaving it on the cleanup stack.

	@return The new instance of CSBEServer.

	*/

		{

		CSBEServer* pSelf = new (ELeave) CSBEServer(aDOM);

		CleanupStack::PushL(pSelf);

		pSelf->ConstructL();

		return pSelf;

		}

	void CSBEServer::ConstructL()

	/**

	Construct this instance of CSBEServer.

	*/

		{

		AllocateGlobalSharedHeapL();

		iGSHInterface = CHeapWrapper::NewL();

		// Initialise the locked flag to be unlock

		iGSHInterface->ResetHeap(iGlobalSharedHeap);

		//

		// Start the server and a timer to stop it if nothing happens.

		StartL(KSBEServerName);

		iShutdown.ConstructL();

		#ifndef _DEBUG

			iShutdown.Start();

		#endif

		}

	void CSBEServer::AllocateGlobalSharedHeapL()

	/**

	Attempts to allocate the GSH. If initial attempts fail, it tries to allocate with

	progressively smaller chunk sizes

	*/

		{	

		TInt attemptedSize;

		TInt retryCount;

		TInt redFactor;

		iDOM->Config().HeapValues(attemptedSize, retryCount, redFactor);

		TInt result = KErrNone;

		for (; retryCount > 0; retryCount--)

			{

			result = iGlobalSharedHeap.CreateGlobal(KNullDesC, attemptedSize, attemptedSize);

			if (result == KErrNone)

				{

				// We have succesfully allocated a GSH

				break;

				}

			else

				{

				// Reduce the size of the GSH by a scale factor

				attemptedSize = attemptedSize / redFactor;

				}

			}

		User::LeaveIfError(result);

		}

	void CSBEServer::AddSession()

	/** Increments the server session count.

	The server will shutdown when its 

	session count drops to zero.

	*/

		{

		++iSessionCount;

		iShutdown.Cancel();

		}

	void CSBEServer::DropSession()

	/** Decrements the server session count.  

	The server will shutdown when its 

	session count drops to zero.

	*/

		{		

		if(--iSessionCount == 0)

			{

			iShutdown.Start();

			}

		}

	CSession2* CSBEServer::NewSessionL(const TVersion& aVersion,

		const RMessage2& /*aMessage*/) const

	/** Constructs a new SBE server session.

	Querys the supplied version infomation from the client

	with that of this server, and leaves if they are incompatable.

	@param aVersion The clients version information

	@param aMessage Is ignored

	@return A new instance of CSBESession

	@leave KErrNotSupported if the version passed in aVersion is not the same as this one

	*/

		{

		TVersion thisVersion(KSBEMajorVersionNumber, 

								KSBEMinorVersionNumber,

								KSBEBuildVersionNumber);

	    if (!User::QueryVersionSupported(thisVersion, aVersion))

			{

			User::Leave(KErrNotSupported);

			}

		return new (ELeave) CSBESession();

		}

	TInt CSBEServer::RunError(TInt aError)

	/** Called when this active objects RunL leaves. 

	May be due to a bad client or the server itself.  In either 

	case, complete the last outstanding message with the error 

	code and continue handling client requests.

    @param aError  Standard Symbian OS error code

	@return The error code to be passed back to the active scheduler framework.

	*/

		{

		//

		// A Bad descriptor is a bad client - panic it.

		if(aError == KErrBadDescriptor)

			{

			PanicClient(KErrBadDescriptor);

			}

		//

		// Complete the message and continue handling requests.

		Message().Complete(aError);

		ReStart();

		return KErrNone;

		}

	void CSBEServer::PanicClient(TInt aPanic) const

	/** Panic a client.

	@param aPanic The panic code.

	*/

		{

		__DEBUGGER()

		_LIT(KPanicCategory,"SBE Server");

		RThread client;

		Message().Client(client);

		client.Panic(KPanicCategory, aPanic);

		}

	} // end namespace