bluetooth/btstack/common/btsap.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 15 Jan 2010 08:13:17 +0200
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// Copyright (c) 2003-2009 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:
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// The base class for Bluetooth Saps
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// 
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//
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#include <es_prot.h>
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#include "BtSap.h"
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#include "secman.h"
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#include "codman.h"
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#include "BTSec.h"
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//Diagnostic string for security check failures, in builds without platsec
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//diagnostics this will be NULL.
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const char* const KBT_SAP_NAME_DIAG = __PLATSEC_DIAGNOSTIC_STRING("Bluetooth SAP");
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CBluetoothSAP::CBluetoothSAP(CBTSecMan& aSecMan, CBTCodServiceMan& aCodMan)
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: iSecMan(aSecMan), iCodMan(aCodMan)
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	{
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	}
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void CBluetoothSAP::ConstructL()
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	{
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	TCallBack accessDenied(AccessDeniedCallBack, this);
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	iAccessDeniedCallBack = new(ELeave) CAsyncCallBack(accessDenied, CActive::EPriorityStandard);
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	}
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TInt CBluetoothSAP::SetDeviceOverride(const TDesC8& aOption)
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/**
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	Provides for overriding of the general *service* security
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	for given devices.
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**/
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	{
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	if (aOption.Length() != sizeof(TBTServiceSecurityPerDevice))
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		{
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		return KErrArgument;
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		}
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	TBTServiceSecurityPerDevice override =
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		*reinterpret_cast<const TBTServiceSecurityPerDevice*>(aOption.Ptr());
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	// add this device into the array of overrides for this SAP
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	// if device is in the list, replace the entry
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	for (TInt i=0; i<=iDeviceOverrides.Count()-1; i++)
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		{
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		if (iDeviceOverrides[i].DeviceAddress() == override.DeviceAddress())
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			{
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			// update!
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			iDeviceOverrides[i].SetDeviceSecurity(override.DeviceSecurity());
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			return KErrNone;
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			}
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		}
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	// if here, this is a new entry
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	return iDeviceOverrides.Append(override);
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	}
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TInt CBluetoothSAP::GetDeviceOverride(TDes8& aOption) const
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/**
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	Allows forgetful apps to give us an address, and we'll tell
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	them the overrides for this service for that device.
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*/
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	{
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	if (aOption.Length() != sizeof(TBTServiceSecurityPerDevice))
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		{
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		return KErrArgument;
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		}
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	TBTServiceSecurityPerDevice overrideBuf =
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		*reinterpret_cast<const TBTServiceSecurityPerDevice*>(aOption.Ptr());
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	const TBTServiceSecurityPerDevice* override = Override(overrideBuf.DeviceAddress());	
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	if (override)
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		{
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		overrideBuf.SetDeviceSecurity(override->DeviceSecurity());
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		aOption = TPtrC8(reinterpret_cast<TUint8*>(&overrideBuf), sizeof(TBTServiceSecurityPerDevice));
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		return KErrNone;
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		}
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	else
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		{
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		return KErrNotFound;
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		}
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	}
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CBluetoothSAP::~CBluetoothSAP()
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	{
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	__ASSERT_DEBUG(!(iCodServiceBits & KBTCodBitsRegdFlag), User::Panic(KBTCodPanic, EBTCodBadDeregister));
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	iDeviceOverrides.Close();
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	delete iAccessDeniedCallBack;
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	}
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const TBTServiceSecurity& CBluetoothSAP::Security() const
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	{
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	return iSecurity;
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	}
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const TBTServiceSecurityPerDevice* CBluetoothSAP::Override(const TBTDevAddr& aAddress) const
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	{
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	//look through overrides for a device override
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	for (TInt i=0; i<iDeviceOverrides.Count(); i++)
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		{
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		if (iDeviceOverrides[i].DeviceAddress() == aAddress)
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			{
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			return &iDeviceOverrides[i];
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			}
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		}
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	return NULL;
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	}
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void CBluetoothSAP::IoctlComplete(TInt /*aErr*/, TUint /*aLevel*/, TUint /*aName*/, TDesC8* aBuf)
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	{
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	iSocket->IoctlComplete(aBuf);
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	}
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TInt CBluetoothSAP::SecurityCheck(MProvdSecurityChecker *aSecurityChecker)
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	{
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	__ASSERT_ALWAYS(aSecurityChecker, User::Panic(KSECURITY_PANIC, EBTPanicNullSecurityChecker));
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	iSecurityChecker = aSecurityChecker;
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	return iSecurityChecker->CheckPolicy(KLOCAL_SERVICES, KBT_SAP_NAME_DIAG);
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	}
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void CBluetoothSAP::StartAccessRequest(const CBluetoothSAP& aSAPWithSecuritySettings, TBool aSecurityModeFourOutgoing)
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/**
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	Ask secman to do security
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	@param aSAPWithSecuritySettings contains the security details
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	@param aSecurityModeFourOutgoing indicates whether this is a security mode 4 request that comes before
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	a security mode 2 request.  This is to be used for establishing a suitable 
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	this SAP has the remote address connecting
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**/
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	{
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	const MAccessRequestResponseHandler& handler = *this;
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	TBTServiceSecurity secReqs(aSAPWithSecuritySettings.Security());
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	if(aSecurityModeFourOutgoing)
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		{
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		// For security mode 4 requests we don't consider the authorisation and any pre-v2.1
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		// security settings.  Note this is only applicable for outgoing access requirements.
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		//So we set a concrete MITM protection value...
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		secReqs.SetAuthentication(secReqs.MitmProtection());
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		// ...then we remove any authorisation, authentication or encryption.
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		secReqs.SetAuthorisation(EFalse);
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		secReqs.SetAuthentication(EFalse);
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		secReqs.SetEncryption(EFalse);
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		}
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	// As a note, using the override as-is is infact safe as none of the override values 
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	// can really affect the security mode 4 aspects.
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	TRAPD(err, SecMan().AccessRequestL(secReqs,
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						aSAPWithSecuritySettings.Override(RemoteAddress()),
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						RemoteAddress(),
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						aSecurityModeFourOutgoing ? EGeneralBondingSecurityMode4Outgoing : EGeneralBonding, // We are doing general bonding
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						const_cast<MAccessRequestResponseHandler&>(handler)));
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	if (err != KErrNone)
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		{
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		// complete request now...
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		iAccessDeniedCallBack->CallBack();
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		}
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	}
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void CBluetoothSAP::CancelAccessRequest()
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	{
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	SecMan().CancelRequest(*this);
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	}
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void CBluetoothSAP::AccessRequestComplete(TInt /*aResult*/)
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/**
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	The SAP wasnt expecting security responses
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	Derivers normally would override (and forward to state)
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**/
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	{
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	_LIT(KBTSAPPanic, "BTSAP");
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	User::Panic(KBTSAPPanic, EBTSecUnexpectedSecurityResponse);
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	}
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/*static*/ TInt CBluetoothSAP::AccessDeniedCallBack(TAny* aBtSap)
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	{
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	CBluetoothSAP* btSap = static_cast<CBluetoothSAP*>(aBtSap);
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	btSap->AccessRequestComplete(EBTSecManAccessDenied);
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	return KErrNone;
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	}
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TInt CBluetoothSAP::SetCodServiceBits(TUint16 aNewCodServiceBits)
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/**
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	Allow SetOpts to set Service bits. These are written to the CoD
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	when the SAP becomes active.
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**/
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	{
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	TInt err = KErrNone;
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	if (aNewCodServiceBits & (~KBTCodValidServiceBits))
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		{
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		err = KErrArgument;		// SetOpt is attempting to set illegal bits
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		}
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	else
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		{
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		if (iCodServiceBits & KBTCodBitsRegdFlag)
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			{
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			err = KErrAlreadyExists; // This SAP has Service bits already registered
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			}
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		else
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			{
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			iCodServiceBits = aNewCodServiceBits; // These can be overwritten at this stage
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			}
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		}
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	return err;
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	}
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void CBluetoothSAP::RegisterCodService()
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/**
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	Allows SAPs to register their Service(s)
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**/
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	{
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	if (iCodServiceBits && !(iCodServiceBits & KBTCodBitsRegdFlag))
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		{
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		// Only send to CodMan once
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		CodMan().RegisterCodService(iCodServiceBits);
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		}
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// Set the regd flag, even if no service bits, this will ensure that late SetOpts are errored
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	iCodServiceBits |= KBTCodBitsRegdFlag;
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	}
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void CBluetoothSAP::DeregisterCodService()
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/**
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	Allows SAPs to clear their Service bits
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**/
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	{
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	if (iCodServiceBits && (iCodServiceBits & KBTCodBitsRegdFlag))
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		{
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		iCodServiceBits &= (~KBTCodBitsRegdFlag);	// reset the registered flag, don't want to confuse CodMan
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		CodMan().RemoveCodService(iCodServiceBits);
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		}
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	iCodServiceBits = 0;	// tidy up these service bits + regd flag
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	}
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TInt CBluetoothSAP::SetOption(TUint aLevel,TUint aName,const TDesC8 &aOption)
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/**
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	This is now the default SetOpt handler for SAP protocols.
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	Common attributes are processed here and the protocol dependent SetOpts are passed on.
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**/
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	{
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	TInt rerr = KErrNone;
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	if(aLevel == KSolBtSAPBase)
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		{
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		switch (aName)
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			{
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			case KBTRegisterCodService:
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				{
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				if (aOption.Length() != sizeof(TDesC8))
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					return KErrArgument;
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		        TUint16 newServiceBits = *reinterpret_cast<const TUint16*>(aOption.Ptr());
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				rerr = SetCodServiceBits(newServiceBits);	// The service bits are saved and then registered when SAP becomes live
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				}
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				break;	
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			default:
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				// Unhandled SetOpt name
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				rerr = KErrNotSupported;
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				break;
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			}
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		}
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	else
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		{
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		// Process SAP SetOpts
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		rerr = SAPSetOption(aLevel, aName, aOption);
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		}
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	return rerr;
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	}