author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 15 Jul 2010 20:25:38 +0300 | |
branch | RCL_3 |
changeset 18 | 3406c99bc375 |
parent 0 | a03f92240627 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 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: IPProxy TCP protocol expression for a regular TCP message |
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* connection. |
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* |
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*/ |
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// INCLUDE FILES |
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#include "CExprTCPMsg.h" |
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#include "CommRouterDefinitions.h" |
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#include "MProtocolObserverTCP.h" |
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#include "MExpressionObserver.h" |
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#define DEBUG_FILENAME "IPProxyEngine.log" |
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#include "DebugPrint.h" |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// CExprTCPMsg::CExprTCPMsg |
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// ----------------------------------------------------------------------------- |
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// |
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CExprTCPMsg::CExprTCPMsg( MExpressionObserver* aObserver ) |
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: iObserver( aObserver ) |
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{ |
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__ASSERT_DEBUG( iObserver, User::Invariant() ); |
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} |
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// ----------------------------------------------------------------------------- |
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// CExprTCPMsg::NewL |
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// ----------------------------------------------------------------------------- |
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// |
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CExprTCPMsg* CExprTCPMsg::NewL( MExpressionObserver* aObserver ) |
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{ |
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CExprTCPMsg* self = CExprTCPMsg::NewLC( aObserver ); |
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CleanupStack::Pop(); |
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return self; |
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} |
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// ----------------------------------------------------------------------------- |
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// CExprTCPMsg::NewLC |
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// ----------------------------------------------------------------------------- |
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// |
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CExprTCPMsg* CExprTCPMsg::NewLC( MExpressionObserver* aObserver ) |
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{ |
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CExprTCPMsg* self = new( ELeave ) CExprTCPMsg( aObserver ); |
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CleanupStack::PushL( self ); |
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return self; |
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} |
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// Destructor |
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CExprTCPMsg::~CExprTCPMsg() |
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{ |
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} |
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// ----------------------------------------------------------------------------- |
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// CExprTCPMsg::HandleReceivedDataL() |
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// ----------------------------------------------------------------------------- |
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// |
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TBool CExprTCPMsg::HandleRecievedMsgL( TDes8& aData, TInt& aStartPos, TInt& aLength ) |
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{ |
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// Check if the prefix matches |
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aStartPos = aData.Find( KTCPPrefix ); |
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if ( aStartPos != KErrNotFound ) |
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{ |
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// Found a matching prefix |
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// Let the observer know |
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iObserver->FrameStarted(); |
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TPtr8 dataToParse( aData.MidTPtr( aStartPos ) ); |
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TInt err = TryParsingL( dataToParse, aLength ); |
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if ( err != KErrNone ) |
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{ |
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// corrupted data in the frame |
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iObserver->ProtocolErrorL( err, aData ); |
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// delete the corrupted data |
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aData.SetLength( 0 ); |
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} |
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return ETrue; |
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} |
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else |
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{ |
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return EFalse; |
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} |
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|
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} |
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109 |
|
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// ----------------------------------------------------------------------------- |
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// CExprTCPMsg::TryParsingL |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CExprTCPMsg::TryParsingL( TDes8& aData, TInt& aLength ) |
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115 |
{ |
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__ASSERT_ALWAYS( aData.Left( KTCPPrefix().Length() ) == KTCPPrefix, |
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User::Panic( _L("Protocol"), 1 ) ); |
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118 |
|
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// TCP:0123,000e,[Some test data] |
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TInt frameOverhead = |
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KTCPPrefix().Length() + |
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KHexDecimalLength + |
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KPortSuffix().Length() + |
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KHexDecimalLength + |
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KLengthSuffix().Length() + |
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KDataSuffix().Length() + |
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KMessageSuffix().Length(); |
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128 |
|
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if ( aData.Length() >= frameOverhead ) |
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130 |
{ |
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TPtrC8 portPtr( |
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aData.Mid( KTCPPrefix().Length(), KHexDecimalLength ) ); |
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133 |
|
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TLex8 portLexer( portPtr ); |
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TUint port; |
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if ( portLexer.Val( port, EHex ) != KErrNone ) |
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137 |
{ |
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return KErrCorrupt; |
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} |
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DEBUG_PRINT( DEBUG_STRING( "CExprTCPMsg::TryParsingL, port = %d" ), port ); |
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141 |
|
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//Check port suffix |
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if ( aData.Mid( KTCPPrefix().Length() + |
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KHexDecimalLength, KPortSuffix().Length() ) != KPortSuffix ) |
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145 |
{ |
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return KErrCorrupt; |
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} |
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148 |
|
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TPtrC8 lengthPtr( aData.Mid( KTCPPrefix().Length() + |
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KHexDecimalLength + KPortSuffix().Length(), KHexDecimalLength ) ); |
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TLex8 lengthLexer( lengthPtr ); |
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TUint length; |
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if ( lengthLexer.Val( length, EHex ) != KErrNone ) |
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154 |
{ |
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return KErrCorrupt; |
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} |
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DEBUG_PRINT( DEBUG_STRING( "CExprTCPMsg::TryParsingL, length = %d" ), length ); |
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158 |
|
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//Check length suffix |
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if ( aData.Mid( |
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KTCPPrefix().Length() + |
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KHexDecimalLength + |
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KPortSuffix().Length() + |
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KHexDecimalLength, KLengthSuffix().Length() ) != KLengthSuffix ) |
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165 |
{ |
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return KErrCorrupt; |
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} |
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168 |
|
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if ( aData.Length() >= TInt( frameOverhead + length ) ) |
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170 |
{ |
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TInt messagePos = KTCPPrefix().Length() + |
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KHexDecimalLength + |
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KPortSuffix().Length() + |
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KHexDecimalLength + |
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KLengthSuffix().Length(); |
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176 |
|
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TPtrC8 message( aData.Mid( messagePos, length ) ); |
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if ( aData.Mid( messagePos + length, |
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KDataSuffix().Length() ) != KDataSuffix ) |
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180 |
{ |
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return KErrCorrupt; |
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} |
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DEBUG_PRINT( DEBUG_STRING( "CExprTCPMsg::TryParsingL, message OK" ) ); |
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184 |
|
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if ( aData.Mid( messagePos + length + KDataSuffix().Length(), |
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KMessageSuffix().Length() ) != KMessageSuffix ) |
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187 |
{ |
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188 |
return KErrCorrupt; |
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189 |
} |
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190 |
|
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191 |
// send parsed results |
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192 |
iObserver->FrameParsedL( port, message ); |
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// set the length of the handled message |
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aLength = frameOverhead + length; |
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195 |
|
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196 |
return KErrNone; |
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197 |
} |
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198 |
|
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199 |
} |
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200 |
return KErrNone; |
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201 |
} |
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202 |
|
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203 |
// End of File |