tcpiputils/dhcp/src/DHCPIP4States.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 26 Jan 2010 15:23:49 +0200
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// Copyright (c) 2004-2009 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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// Implements the DHCPv4 States representing each interface
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// 
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//
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/**
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 @file DHCPIP4States.cpp
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 @internalTechnology
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*/
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#include "DHCPIP4States.h"
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#include "DHCPMsg.h"
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#include "DHCPServer.h"
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#include "DHCPStatesDebug.h"
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CAsynchEvent* CDHCPIP4Select::ProcessL(TRequestStatus& aStatus)
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/**
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  * Interface function, execute state machine
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  *
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  * @internalTechnology
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  */
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	{
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	DHCP_DEBUG_PUBLISH_STATE(DHCPDebug::EDHCPIP4Select);
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	CDHCPIP4StateMachine& rDHCPIPv4 = DHCPIPv4();
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	if (rDHCPIPv4.iReceiving)
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		{		
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		if((rDHCPIPv4.GetMessageTypeL() == DHCPv4::EDHCPOffer) && rDHCPIPv4.CheckXid())
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			{
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			return CDHCPSelect::ProcessL(aStatus);
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			}
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		else
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			{
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			rDHCPIPv4.iReceiving = EFalse;
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			}	
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		}				
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	return rDHCPIPv4.ReceiveL(&aStatus);	
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	}
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#ifdef SYMBIAN_NETWORKING_DHCPSERVER	
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CAsynchEvent* CDHCPIP4HandleClientMsgs::ProcessL(TRequestStatus& aStatus)
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/**
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  * Interface function, execute state machine
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  *
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  * @internalTechnology
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  */
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	{
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	__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDHCPIP4HandleClientMsgs::ProcessL")));
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	DHCP_DEBUG_PUBLISH_STATE(DHCPDebug::EDHCPIP4HandleClientMsgs);
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	CDHCPIP4StateMachine& rDHCPv4  = DHCPIPv4();
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	rDHCPv4.iReceiving = EFalse;
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#ifdef SYMBIAN_NETWORKING_ADDRESS_PROVISION
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	TBool provisioned = rDHCPv4.ClientHwAddrProvisioned();
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	if(provisioned)
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		{
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#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION
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		rDHCPv4.CheckClientMsgL();
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#ifdef SYMBIAN_NETWORKING_ADDRESS_PROVISION
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		}
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#endif //SYMBIAN_NETWORKING_ADDRESS_PROVISION
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	// self complete to continue the state machine
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	TRequestStatus* p = &aStatus;
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	User::RequestComplete(p, KErrNone);
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	return iNext;
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	}	
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CAsynchEvent* CDHCPIP4SendRequestResponse::ProcessL(TRequestStatus& aStatus)
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	{
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	__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDHCPIP4SendRequestResponse::ProcessL")));
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	DHCP_DEBUG_PUBLISH_STATE(DHCPDebug::EDHCPIP4SendRequestResponse);
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	CDHCPIP4StateMachine& rDHCPIPv4 = DHCPIPv4();
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	if (rDHCPIPv4.iReceiving)
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		{		
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		if((rDHCPIPv4.GetClientMessageTypeL() == DHCPv4::EDHCPRequest))
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			{
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			if(rDHCPIPv4.CheckXid())
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				{
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				// this is from the same client which we last serviced
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				return CDHCPSendRequestResponse::ProcessL(aStatus);	
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				}
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			else 
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				{
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				// this request is not from the same client as the one we recently serviced  
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				// check if this was a renew/rebind request from a client whom we provided an IP address in the past
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				// then we need to service this client and not ignore it
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				TUint32 clientAddr = rDHCPIPv4.GetClientIPAddress();
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				if(rDHCPIPv4.GetIPAddressToOffer() == clientAddr ||
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						!clientAddr)
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					{
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					rDHCPIPv4.SetClientIdentified(ETrue);
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					return 	CDHCPSendRequestResponse::ProcessL(aStatus);	
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					}
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				else
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					{
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					// unexpected packet, proceed to recieve the packet and discard.
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					__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDHCPIP4SendRequestResponse::ProcessL Unexpected packet")));
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					rDHCPIPv4.iReceiving = EFalse;
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					} 
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				}	
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			}
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		else
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			{
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			rDHCPIPv4.iReceiving = EFalse;
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			}	
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		}				
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	return rDHCPIPv4.ReceiveOnPort67L(&aStatus);
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	}
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CAsynchEvent* CDHCPIP4SendInformResponse::ProcessL(TRequestStatus& aStatus)
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	{
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	__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDHCPIP4SendInformResponse::ProcessL")));
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	DHCP_DEBUG_PUBLISH_STATE(DHCPDebug::EDHCPIP4SendInformResponse);	
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	CDHCPIP4StateMachine& rDHCPIPv4 = DHCPIPv4();
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	if (rDHCPIPv4.iReceiving)
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		{		
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		if((rDHCPIPv4.GetClientMessageTypeL() == DHCPv4::EDHCPInform))
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			{
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			return CDHCPSendInformResponse::ProcessL(aStatus);
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			}
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		else
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			{
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			rDHCPIPv4.iReceiving = EFalse;
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			}	
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		}				
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	return rDHCPIPv4.ReceiveOnPort67L(&aStatus);
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	}	
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void CDHCPIP4BindServer::TimerExpired()
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	{
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	CDHCPStateMachine& rDHCP = Dhcp();
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	CDHCPBindServer::TimerExpired();
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	if ( !rDHCP.TimerActive() )
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		{
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		//finish either => bound or not
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		TRequestStatus* p = &iStateMachine->iStatus;
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		User::RequestComplete(p, iErr); 
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		rDHCP.SetAsyncCancelHandler(NULL);
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		}
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	}
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#endif // SYMBIAN_NETWORKING_DHCPSERVER
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void CDHCPIP4WaitForDAD::TimerExpired()
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	{
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	CDHCPStateMachine& rDHCP = Dhcp();
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	CDHCPWaitForDADBind::TimerExpired();
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	if ( !rDHCP.TimerActive() )
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		{
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		//finish either => bound or not
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		TRequestStatus* p = &iStateMachine->iStatus;
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		User::RequestComplete(p, iErr); 
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		rDHCP.SetAsyncCancelHandler(NULL);
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		}
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	}
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