// 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:

// The DHCPStateMachine header file

// 

//

/**

 @file DHCPStateMachine.h

*/

#ifndef DHCPSTATEMACHINE_H

#define DHCPSTATEMACHINE_H

#include <e32base.h>

#include <comms-infras/statemachine.h>

#include "MsgSender.h"

#include "DHCP_Std.h"

class CExpireTimer;

class CDHCPMessageHeader;

class CDHCPState;

#ifdef SYMBIAN_NETWORKING_ADDRESS_PROVISION

class CDhcpHwAddrManager;

#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION

#ifdef SYMBIAN_NETWORKING_DHCPSERVER

enum TSvrState

	{

	ESvrBinding,

	ESvrWaitForAnyDHCPMsgs,

	ESvrWaitForDiscoverInform,

	ESvrEnd

	};

enum TSvrSpecificState

	{

	ESvrDiscoverInProgress,

	ESvrInformInProgress,

	ESvrRenewInProgress,

	ESvrRebindInProgress,

	ESvrDeclineInProgress,

	ESvrReleaseInProgress,

	};

#endif // SYMBIAN_NETWORKING_DHCPSERVER	

class CDHCPStateMachine : public CStateMachine, public MMSListener

/**

  * Implements helper function abstractions

  *

  * @internalTechnology

  */

	{

friend class CDHCPControl;

friend class CDHCPDb;

friend class CDHCPAddressAcquisition;

friend class CDHCPSelect;

friend class CDHCPRebootConfirm;

friend class CDHCPInformationConfig;

friend class CDHCPRequest;

friend class CDHCPRenew;

friend class CDHCPRebind;

friend class CDHCPWaitForClientMsgs;

public:

   enum EAddressType

      {

      EAllAvailableServers,

      EUnicast

      };

	enum EInitialisationContext

		{

		EFirstCall,

		ESubsequentCalls

		};

public:

	~CDHCPStateMachine();

	void Cancel();

	virtual void GetServerAddress( TInetAddr& aAddress ) = 0;

  	virtual void SetCurrentAddress(const TInetAddr& aCurrentAddress, const TInetAddr& aSubnetMask) = 0;

	void SetCurrentAddress(const TInetAddr& aCurrentAddress);

#ifdef SYMBIAN_NETWORKING_DHCPSERVER	

	virtual void GetClientAddress(TInetAddr& aAddress);

	virtual void InitServerStateMachineL(MStateMachineNotify* aStateMachineNotify);

	virtual void InitServerBinding(MStateMachineNotify* aStateMachineNotify);	

	virtual void CloseNSendServerMsgL(TRequestStatus& aStatus, CDHCPStateMachine::EAddressType aEAddressType);

	void CloseNSendSvrMsgL(TTimeIntervalSeconds aSecs, TInt aMaxRetryCount, CDHCPStateMachine::EAddressType aEAddressType);

	virtual CDHCPState* ReceiveOnPort67L( TRequestStatus* aStatus ) = 0;

	virtual void InitialiseServerSocketL() = 0;

   	virtual void CreateOfferMsgL() = 0;

   	virtual void HandleRequestMsgL() = 0;

   	virtual void HandleInformMsgL() = 0;   	

   	void SetClientIdentified(TBool aClientIdentified);

   	TBool IsClientIdentified();

   	void SetServerState(TBool aServerImpl);

   	void FetchServerAddressL();

	TBool CheckNetworkId();

	TInt BindServerInterface();

	TInetAddr GetInterfaceServerGlobalAddress();

	void SetDNSInformation(TDes8* aDNSInfo);

#endif // SYMBIAN_NETWORKING_DHCPSERVER	

	// returns unspecified address if no global address present

	TInetAddr GetInterfaceGlobalAddress();

	TBool DoesInterfaceKnowAnyDNSServers();

   //dhcpIPX tasks

   virtual void StartInitL(MStateMachineNotify* aStateMachineNotify, EInitialisationContext aInitialisationContext, TInt aUserTimeOut = 0 ) = 0;

   virtual void StartInformL(MStateMachineNotify* aStateMachineNotify, TBool aStaticAddress) = 0;

   virtual void StartRebootL(MStateMachineNotify* aStateMachineNotify) = 0;

   virtual void StartRenewL(MStateMachineNotify* aStateMachineNotify, TInt aUserTimeOut) = 0;

   virtual void StartDeclineL(MStateMachineNotify* aStateMachineNotify) = 0;

   virtual void StartReleaseL(MStateMachineNotify* aStateMachineNotify) = 0;

   virtual void StartRebindL(MStateMachineNotify* aStateMachineNotify) = 0;

   virtual void RemoveConfiguredAddress(const TInetAddr *aInetAddr = NULL ) = 0;

   void RemoveConfiguredAddress( const TSoInet6InterfaceInfo& aSoInet6InterfaceInfo );

   //interface used by CDHCPXXStates derivatives

	virtual void CloseNSendMsgL(TRequestStatus& aStatus, CDHCPStateMachine::EAddressType aEAddressType);

   void CloseNSendMsgL(TTimeIntervalSeconds aSecs, TInt aMaxRetryCount, CDHCPStateMachine::EAddressType aEAddressType);

   virtual CDHCPState* ReceiveL( TRequestStatus* aStatus ) = 0;

   void CancelMessageSender();

   virtual void InitialiseSocketL() = 0;

   virtual void CreateDiscoverMsgL() = 0;                //discover IP4 solicit IP6

   virtual void CreateOfferAcceptanceRequestMsgL() = 0;  //request after offer IP4 advertise IP6

   virtual void CreateRebootRequestMsgL() = 0;           //reboot IP4 confirm IP6

   virtual void CreateInformMsgL() = 0;                  //no IP address is required (static address IP4 stateless neg. IP6)

   virtual void CreateDeclineMsgL() = 0;

   virtual void CreateRenewRequestMsgL() = 0;

   virtual void CreateRebindRequestMsgL() = 0;

   virtual void CreateReleaseMsgL() = 0;

   virtual void HandleOfferL() = 0;                      //after discover IP4 solicit IP6 or rebind(IP4/IP6)

   virtual CDHCPState* HandleReplyL( TRequestStatus* aStatus ) = 0;//after request

   TInt BindToSource();

   virtual void BindSocketForUnicastL() = 0;

   //interface used by both CDHCPXXStates derivatives & CDHCPXXControl

   void StartTimer(TTimeIntervalSeconds aSeconds, MExpireTimer& aExpireTimer);

   void StartTimer( TTimeIntervalMicroSeconds32 aMicroSeconds, MExpireTimer& aExpireTimer);

   void CancelTimer();

   TBool TimerActive() const;

   TBool IsGettingCfgInfoOnly() const;

   void SetAsyncCancelHandler(CDHCPState* aStateOwner);

   virtual TInt MSReportError(TInt aError);

	CDHCPMessageHeader* Message() const;

	const TName& InterfaceName() const

		{

		return iInterfaceName;

		}

	void SetIdle( TBool aIdle );

	TBool Idle();

	void SetFastTimeoutDuringInform();

	TBool FastTimeoutDuringInform();

	void SetCompleteClientRequestTrue();

	void SetCompleteClientRequestFalse();

	TBool CompleteClientRequest();

#ifdef SYMBIAN_DNS_PROXY	

	TInetAddr GetListenerAddress();

#endif // SYMBIAN_DNS_PROXY

protected:

#ifdef SYMBIAN_NETWORKING_DHCPSERVER

#ifdef SYMBIAN_NETWORKING_ADDRESS_PROVISION

   CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName, CDhcpHwAddrManager* aDhcpHwAddrManager, TBool aDHCPServerImpl);

#else

   CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName,TBool aDHCPServerImpl);

#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION

#else   

   CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName);

#endif //  SYMBIAN_NETWORKING_DHCPSERVER

   void ConstructL();

   void Start(MStateMachineNotify* aStateMachineNotify);

   virtual void DoCancel();

   virtual void AssembleClientIDsL() = 0;

   void FetchHWAddress();

   virtual void PrepareToSendL(CDHCPStateMachine::EAddressType aEAddressType) = 0;

#ifdef SYMBIAN_NETWORKING_DHCPSERVER   

   	virtual void PrepareToSendServerMsgL(CDHCPStateMachine::EAddressType aEAddressType) = 0;

	void AddScopeToClientAddrL(TInetAddr& addr);

#endif // SYMBIAN_NETWORKING_DHCPSERVER	

   virtual void AssignAddresses( TInetAddr& aDest, const TInetAddr& aSrc ) const = 0;

   TUint32 GetNetworkIdL() const;

   void AddScopeToAddrL(TInetAddr& addr);

protected:

	const TName& iInterfaceName;

	RSocketServ& iEsock;

	RConnection& iConnection;

	CDHCPMessageHeader* iDhcpMessage;

	CMessageSender* iMessageSender;

	CExpireTimer* iTimer;

	TSockAddr iHardwareAddr;

#ifdef SYMBIAN_NETWORKING_DHCPSERVER	

	TSockAddr iClientHWAddr;

	TInetAddr iInformClientAddr;

#ifdef SYMBIAN_NETWORKING_ADDRESS_PROVISION

	CDhcpHwAddrManager* iDhcpHwAddrManager;

#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION

#endif // SYMBIAN_NETWORKING_DHCPSERVER	

	CDHCPState* iAsyncCancelHandler; //iAsyncCancelHandler is set by the DHCP State that assumes ownership of the RequestStatus object of CDHCPStateMachine 

public: 

   //accessed by CDHCPIP6MessageReader

	RSocket iSocket;

	TInetAddr iSocketAddr;

#ifdef SYMBIAN_NETWORKING_DHCPSERVER	

	RSocket iSvrSocket;//For the Server Impl

	TInetAddr iSrvSocketAddr;

	TSvrState iSvrState;

	TSvrSpecificState iSvrSpecificState;

	HBufC8* 	iDNSInformation;

#endif // SYMBIAN_NETWORKING_DHCPSERVER	

#ifdef SYMBIAN_DNS_PROXY

	TBuf8<KMaxName>   iProxyHostName;

	TBuf8<KMaxName>   iProxyDomainName;

	TInetAddr   iProxyDnsSrvAddr;

	TInetAddr   iClientStaticAddr;

	TUint32     iOfferedAddress;

	TBuf8<KMaxName>     iClientHostName;

#endif // SYMBIAN_DNS_PROXY

protected:

	TDhcpRnd iXid;

	TBool iCfgInfoOnly; //if ETrue then:

							  //for IP4 indicates that a static address is used

							  //for IP6 if set during negotiation it indicates the same as for IP4

							  //			if set by CDHCPIP6Reconfigure states it indicates that the server wants us

							  //			to start inform-request rather than renew request

	TBool iMakeIdle;		  // used only for IP6, when RA recvd, with both 'M' and 'O' flags as false, this flag makes statemachine idle

	TBool iFastTimeout;

	TBool iCompleteClientRequest;	//used only for IP6, set to ETrue when 'O' flag in RA is set

	//data read from CommDb &&|| stored in persistent storage

	//the "public" should be replaced by some more inteligent way of dealing with persistent & init data

	//common for IP4 & IP6(maybe EPOC wide persistent storage?)

    //for IP6 it's the first address from the first IA option in the reply message

  	TInetAddr iCurrentAddress;

	TTime iTaskStartedAt;			// Time that task started. If sucessful it is copied to iStartedAquisitionAt

	TTime iStartedAquisitionAt;	// Time that lease period started

	TInetAddr iDefGateway;

	TBool iNameServerAddressesFromServer;

	TInetAddr iNameServer1;

	TInetAddr iNameServer2;

	//DNS client names

	HBufC8*   iHostName;

	HBufC8*   iDomainName;

	TUint32 iRenewalTimeT1;			// number of seconds after iStartedAquisitionAt when we send a renew request

	TUint32 iRebindTimeT2;			// number of seconds after iStartedAquisitionAt when we send a rebind request (only if any renew fails)

	TUint32 iLeaseTime;				// number of seconds after iStartedAquisitionAt when the lease expires

	TBool iReceiving;				//ETrue if we are waiting to receive data from socket

	CDHCPState* iFirstState; //accessed by CDHCPIP6ListenToNeighbor

	RBuf8 iClientId;  //accessed from CDhcpDb

	TInt iMaxRetryCount;	//IPv6 calculates its own retry values..so iMaxRetryCount is ignored

	TInt iRetryDhcpIpCount;	//number of retry for DHCP IP in case a DAD is detected.

#ifdef SYMBIAN_NETWORKING_DHCPSERVER

	TUint32 iYiaddr;

	TUint32 iCiaddr;

	TUint16 iFlag;							  

	TUint8 iMesgType;							  

	TBool iClientIdentified;

	TBool iServerImpl;

#endif // 	SYMBIAN_NETWORKING_DHCPSERVER	

#ifdef SYMBIAN_NETWORKING_DHCP_MSG_HEADERS

public:	

	TBool iDhcpInformAckPending;

	RBuf8 iSavedExtraParameters;

	};

#ifdef SYMBIAN_NETWORKING_DHCPSERVER

#ifndef SYMBIAN_NETWORKING_ADDRESS_PROVISION

inline CDHCPStateMachine::CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName,TBool aDHCPServerImpl):

                     iInterfaceName(aInterfaceName),

                     iEsock(aEsock),

                     iConnection(aConnection),

                     iCfgInfoOnly( EFalse ),iMaxRetryCount(KInfinity),

					 iMakeIdle (EFalse),

					 iFastTimeout (EFalse),

					 iServerImpl(aDHCPServerImpl),

					 iRetryDhcpIpCount(0)

#else

inline CDHCPStateMachine::CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName, CDhcpHwAddrManager* aDhcpHwAddrManager, TBool aDHCPServerImpl):

                     iInterfaceName(aInterfaceName),

                     iEsock(aEsock),

                     iConnection(aConnection),

                     iCfgInfoOnly( EFalse ),iMaxRetryCount(KInfinity),

					 iMakeIdle (EFalse),

					 iFastTimeout (EFalse),

					 iServerImpl(aDHCPServerImpl),

					 iRetryDhcpIpCount(0),

					 iDhcpHwAddrManager(aDhcpHwAddrManager)

#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION

/**

  * Constructor of the DHCPStateMachine

  *

  * @internalTechnology

  *

  */

	{

	}

#else 

inline CDHCPStateMachine::CDHCPStateMachine(RSocketServ& aEsock, RConnection& aConnection, const TName& aInterfaceName):

	iInterfaceName(aInterfaceName),

	iEsock(aEsock),

	iConnection(aConnection),

	iCfgInfoOnly( EFalse ),iMaxRetryCount(KInfinity),

	iMessageSender(NULL),

	iMakeIdle(EFalse),

	iFastTimeout(EFalse),

	iRetryDhcpIpCount(0)

/**

  * Constructor of the DHCPStateMachine

  *

  * @internalTechnology

  *

  */

	{

	}

#endif // SYMBIAN_NETWORKING_DHCPSERVER

inline CDHCPMessageHeader* CDHCPStateMachine::Message() const

	{

	return iDhcpMessage;

	}

inline void CDHCPStateMachine::CancelMessageSender()

   {

	if (iMessageSender != NULL)

		iMessageSender->Cancel();

   }

inline TBool CDHCPStateMachine::TimerActive() const

	{

	return iTimer != NULL ? iTimer->IsActive() : EFalse;

	}

inline void CDHCPStateMachine::CancelTimer()

	{

	__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDHCPStateMachine::CancelTimer")));

	if (iTimer != NULL)

		iTimer->Cancel();

	}

inline TBool CDHCPStateMachine::IsGettingCfgInfoOnly() const

	{

	return iCfgInfoOnly;

	}

inline void CDHCPStateMachine::SetAsyncCancelHandler(CDHCPState* aStateOwner) 

	{	

	iAsyncCancelHandler =  aStateOwner;

	}	

inline void CDHCPStateMachine::SetCurrentAddress(const TInetAddr& aCurrentAddress)

/**

  * The SetCurrentAddress function

  *

  * Stores ip address

  *

  * @internalTechnology

  */

	{

	iCurrentAddress = aCurrentAddress;

	}

inline void CDHCPStateMachine::SetIdle ( TBool aIdle )

	{

	iMakeIdle = aIdle;

	}

inline TBool CDHCPStateMachine::Idle ()

	{

	return iMakeIdle;

	}

inline void CDHCPStateMachine::SetFastTimeoutDuringInform()

	{

	iFastTimeout = ETrue;

	}

inline TBool CDHCPStateMachine::FastTimeoutDuringInform()

	{

	return iFastTimeout;

	}

inline void CDHCPStateMachine::SetCompleteClientRequestTrue()

	{

	iCompleteClientRequest = ETrue;

	}

inline void CDHCPStateMachine::SetCompleteClientRequestFalse()

	{

	iCompleteClientRequest = EFalse;

	}

inline TBool CDHCPStateMachine::CompleteClientRequest()

	{

	return iCompleteClientRequest;

	}

#ifdef SYMBIAN_NETWORKING_DHCPSERVER	

inline void CDHCPStateMachine::SetClientIdentified(TBool aClientIdentified)

	{

	iClientIdentified = aClientIdentified;

	}

inline TBool CDHCPStateMachine::IsClientIdentified()

	{

	return iClientIdentified;

	}

#endif 	// SYMBIAN_NETWORKING_DHCPSERVER	

#endif