applayerprotocols/ftpengine/ftpprot/PASVANS.CPP
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:09:52 +0200
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Revision: 201003 Kit: 201005
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// Copyright (c) 1998-2009 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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// PASV command answer parser
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// Author:	Philippe Gabriel
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// RFC 959 defines the syntax for answer to the PASV command
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// We must parse an IP+Port number (decimal, big endian)
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// (ip1,ip2,ip3,ip4,ip5,port1,port2)
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// We parse these regular expressions using an FSM
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// Use:
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// TFtpPASVAnswerParser::Reset 
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// to Reset the parser before we begin to parse a new answer
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// TFtpPASVAnswerParser::Parse 
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// to parse an answer
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// returns:
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// TRUE: we parsed an answer (answer might be correct or inccorect)
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// FALSE: An answer has not been completely parsed yet
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// TFtpPASVAnswerParser::Fetch 
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// Fetch an answer
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// returns:
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// TRUE: We got a valid answer
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// FALSE: The answer we got had an invalid syntax
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// 
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//
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/**
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 @file PASVANS.CPP
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 @internalComponent
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*/
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#include "DEBUG.H"
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#include "PASVANS.H"
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#include <e32base.h>
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#include <e32test.h>
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#include <in_sock.h>
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//
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// Definitions
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//
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TBool TFtpPASVAnswerParser::Fetch(TInetAddr& aFTPServerAddress)
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	{
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	__ASSERT_DEBUG((iState == ESuccess) || (iState == EFailed), User::Panic(_L("TFtpPASVAnswerParser::Fetch incorrect state"), 0));
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	if(iState != ESuccess)
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		return FALSE;
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	aFTPServerAddress = iFTPServerAddress;
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	return TRUE;
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	}
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void	TFtpPASVAnswerParser::Reset(void)
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	{
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	iState = EIdle;	
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	iFTPServerAddress.SetFamily(KAFUnspec);
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	}
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TBool	TFtpPASVAnswerParser::Parse(const TDesC8& aBuffer, const TInetAddr& aAddr)
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	{
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	if (aAddr.Family() == KAfInet)
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		return ParsePASV(aBuffer);
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	else
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		{
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		__ASSERT_DEBUG(aAddr.Family() == KAfInet6, User::Panic(_L("TFtpPASVAnswerParser"), 0));
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		iFTPServerAddress.SetAddress(aAddr.Ip6Address());
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		return ParseEPSV(aBuffer);
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		}
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	}
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TBool TFtpPASVAnswerParser::ParsePASV(const TDesC8& aBuffer)
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	{
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	const TUint8*	c;
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	TInt			bufLen;
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	TUint		aIPAndPort[6];
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	if ((iState == ESuccess) || (iState == EFailed))
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		// Already parsed an answer
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		return TRUE;
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	for (c= aBuffer.Ptr(),bufLen = aBuffer.Length();(bufLen>0);bufLen--,c++)
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		{
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		switch (iState)
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			{
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			case EIdle:
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				if (*c=='(')
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					{
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					/* We fetched a (, begin parsing*/
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					iNumberCounter=0;
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					iState++;
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					}
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				break;
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			case EBeginParse:
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				if ((*c>='0') && (*c<='9'))
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					{
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					iDigit.Zero();
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					iDigit.Append(*c);
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					iState++;
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					}
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				break;
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			case EParsing:
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				if ((*c>='0') && (*c<='9'))
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					if(iDigit.Length() == 3)
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						{
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						// We're stuffed, we got more than 3 digits
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						iState = EFailed;
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						return TRUE;
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parents:
diff changeset
   114
						}
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parents:
diff changeset
   115
					else
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parents:
diff changeset
   116
						{
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diff changeset
   117
						iDigit.Append(*c);
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parents:
diff changeset
   118
						}
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parents:
diff changeset
   119
				else // We should have a , or a ) I accept everything
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parents:
diff changeset
   120
					{
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parents:
diff changeset
   121
					
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parents:
diff changeset
   122
					//[1] Translate the last number that we parsed
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   123
					TUint	tempValue;
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   124
					TLex input(iDigit);
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   125
					input.Val(tempValue,EDecimal);
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   126
					if(tempValue>255)
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parents:
diff changeset
   127
						{
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diff changeset
   128
						// If Value out of bound, we're stuffed
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diff changeset
   129
						// Error bail out
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   130
						iState = EFailed;
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   131
						return TRUE;
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   132
						}
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parents:
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   133
					aIPAndPort[iNumberCounter++] = tempValue;
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parents:
diff changeset
   134
					// [2] Are we waiting for more numbers?
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parents:
diff changeset
   135
					if(iNumberCounter == 6)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   136
						{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   137
						// OKay We've finished
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   138
						iFTPServerAddress.SetAddress(INET_ADDR(aIPAndPort[0],aIPAndPort[1],aIPAndPort[2],aIPAndPort[3]));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   139
						iFTPServerAddress.SetPort(aIPAndPort[4]<<8 | aIPAndPort[5]);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   140
						iState = ESuccess;
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parents:
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   141
						return TRUE;
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parents:
diff changeset
   142
						}
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parents:
diff changeset
   143
					else
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   144
						// Fetch next number
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parents:
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   145
						iState = EBeginParse;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   146
					}
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parents:
diff changeset
   147
				break;
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parents:
diff changeset
   148
			default:
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   149
				break;
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parents:
diff changeset
   150
			}
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parents:
diff changeset
   151
		}
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parents:
diff changeset
   152
	return FALSE;
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parents:
diff changeset
   153
	}
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parents:
diff changeset
   154
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   155
TBool TFtpPASVAnswerParser::ParseEPSV(const TDesC8& aBuffer)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   156
	{
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parents:
diff changeset
   157
	TInt			bufLen = aBuffer.Length();
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parents:
diff changeset
   158
	TUint           port = 0;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   159
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parents:
diff changeset
   160
	if ((iState == ESuccess) || (iState == EFailed))
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   161
		// Already parsed an answer
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parents:
diff changeset
   162
		return ETrue;
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parents:
diff changeset
   163
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   164
	for (const TUint8* c = aBuffer.Ptr();bufLen>0;bufLen--,c++)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   165
		{
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parents:
diff changeset
   166
		switch (iState)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
			{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   168
			case EIdle:
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   169
				if (*c=='(')
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   170
					{
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parents:
diff changeset
   171
					/* We fetched a (, begin parsing*/
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   172
					iState = EBeginParse;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   173
					}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   174
				break;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   175
			case EBeginParse:
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   176
				if (TChar(*c).IsDigit())
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   177
					{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   178
					port = *c - '0';
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   179
					iState = EParsing;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   180
					}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   181
				break;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   182
			case EParsing:
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   183
				if (TChar(*c).IsDigit())
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   184
					{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   185
					port = port*10 + (*c - '0');
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   186
					}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   187
				else // We should have a "|", end the parsing
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   188
					{
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   189
					if(port>(1<<16) || *c != '|')
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   190
						{
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   191
						// If Value out of bound or  the last character is not a '|' 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   192
						// then the parsing failed
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   193
						iState = EFailed;
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   194
						return ETrue;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   195
						}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   196
					
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   197
					iFTPServerAddress.SetPort(port);
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   198
					iState = ESuccess;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   199
					return ETrue;
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   200
					}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   201
				break;
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   202
			default:
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   203
				break;
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   204
			}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   205
		}
b16258d2340f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   206
	return EFalse;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   207
	}