--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tcpiputils/dhcp/src/DHCPIP6MsgSender.cpp	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,132 @@
+// 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:
+// Implements the Message sender DHCPIP6 specific access functthat fustions 
+// resends messages until max retry or max count has been reached..
+// 
+//
+
+/**
+ @file DHCPIP6MsgSender.cpp
+ @internalTechnology
+*/
+
+#include "DHCPServer.h"
+#include "DHCPIP6MsgSender.h"
+#include "DhcpIP6Msg.h"
+#include <in_sock.h>
+#include <es_sock.h>
+
+/*
+the retransmition alg recomended by RFC3315 (DHCPv6). Could be used for DHCPv4 as well
+for DHPCv4 doesn't specify anything
+   RT for the first message transmission is based on IRT:
+
+      RT = IRT + RAND*IRT
+
+   RT for each subsequent message transmission is based on the previous
+   value of RT:
+
+      RT = 2*RTprev + RAND*RTprev
+
+   MRT specifies an upper bound on the value of RT (disregarding the
+   randomisation added by the use of RAND).  If MRT has a value of 0,
+   there is no upper limit on the value of RT.  Otherwise:
+
+      if (RT > MRT)
+     RT = MRT + RAND*MRT
+
+*/
+TBool CDHCPIP6MessageSender::SendingContinues() const
+/**
+  * determines whether to continue the sending
+  *
+  * 
+  * @internalTechnology
+  *
+  */
+	{
+	if ( iRetryCount )
+		{//EElapsedTime option MUST be the first option in the option part of the message
+		//see CDHCPIP6StateMachine::SetMessageHeader fn
+		TUint32 elapsedHundrOfSecs = iMicroSecs.Int() / KMicrosecondsInSecs * 100;
+		TUint8* elapsedOptionBody = const_cast<TUint8*>(iMsg->Des().Ptr()) + DHCPv6::KDHCPHeaderLength + DHCPv6::KOptionHeaderLength;
+		TUint32 current = TBigEndian::GetValue( elapsedOptionBody, DHCPv6::KElapsedTimeOptionLen );
+		TBigEndian::SetValue( elapsedOptionBody, DHCPv6::KElapsedTimeOptionLen, current + elapsedHundrOfSecs );
+		}
+	return iRetryCount < iMaxRetryCount && iRetryDuration < iMaxRetryDuration;
+	}
+
+TBool CDHCPIP6MessageSender::CalculateDelay()
+/**
+  * Calculates the first and the next retransmition time. Returns ETrue is the time calculated
+  * is greater than zero.
+  *
+  * @internalTechnology
+  *
+  */
+    {
+    if ( iRetryCount > -1 )
+        {
+        TInt ms = iMicroSecs.Int();
+        ms = iInitialRetryTimeout ? iInitialRetryTimeout : ms + 2*ms + iXid.Rnd( -ms/10, ms/10 );
+      
+        if ( ms > iMaxRetryTimeout || ms <= 0 )
+            {
+            ms = iMaxRetryTimeout + iXid.Rnd( -iMaxRetryTimeout/10, iMaxRetryTimeout/10 );
+            }
+        iInitialRetryTimeout = 0;
+        iMicroSecs = ms;
+        }
+    else
+        {//msg to be send for the first time
+        iMicroSecs = iXid.Rnd( 0, iFirstSendDelay );
+        }
+   
+    return iMicroSecs.Int() > 0;    
+    }
+
+void CDHCPIP6MessageSender::SetListener( MMSListener* aMMSListener )
+   {
+   iMMSListener = aMMSListener;
+   }
+
+MMSListener* CDHCPIP6MessageSender::EventListener() const
+   {
+   return iMMSListener;
+   }
+
+void CDHCPIP6MessageSender::SetInitialRetryTimeout( TInt aSeconds )
+   {
+   iInitialRetryTimeout = KMicrosecondsInSecs * aSeconds;
+   }
+
+void CDHCPIP6MessageSender::SetMaxRetryTimeout( TInt aSeconds )
+   {
+   iMaxRetryTimeout = KMicrosecondsInSecs * aSeconds;
+   }
+
+void CDHCPIP6MessageSender::SetMaxRetryCount( TInt aCount )
+   {
+   iMaxRetryCount = aCount;
+   }
+
+void CDHCPIP6MessageSender::SetMaxRetryDuration( TInt aSeconds )
+   {
+   iMaxRetryDuration = KMicrosecondsInSecs * aSeconds;
+   }
+
+void CDHCPIP6MessageSender::SetFirstSendDelay( TInt aSeconds )
+   {
+   iFirstSendDelay = KMicrosecondsInSecs * aSeconds;
+   }