Click here to Skip to main content
11,429,154 members (62,134 online)
Click here to Skip to main content
Add your own
alternative version

How Proxy Server serves FTP clients?

, 10 Feb 2005 CPOL
This article describes how Proxy Server deals with PORT and PASV FTP commands
proxyftp_demo.zip
LiteProxyServer.exe
proxyftp_src.zip
IPHlpApi.Lib
RES
LiteProxyServerDoc.ico
Mem1.ICO
Mem2.ICO
Mem3.ICO
Mem4.ICO
Mem5.ICO
Mem6.ICO
Mem7.ICO
Mem8.ICO
Mem9.ICO
Mem10.ICO
ChatRoom.ico
LiteProxyServer.ico
Toolbar.bmp
BITMAP1.BMP
BMP00001.BMP
BMP00002.BMP
LiteProxyServer.dsp
LiteProxyServer.dsw
// LiteProxyServer.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "LiteProxyServer.h"

#include "MainFrm.h"
#include "LiteProxyServerDoc.h"
#include "LiteProxyServerView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CLiteProxyServerApp

BEGIN_MESSAGE_MAP(CLiteProxyServerApp, CWinApp)
	//{{AFX_MSG_MAP(CLiteProxyServerApp)
	//}}AFX_MSG_MAP
	// Standard file based document commands
	ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)
	ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLiteProxyServerApp construction

CLiteProxyServerApp::CLiteProxyServerApp()
{
	m_nInProgress = m_nReceivedBytes = m_nCacheBytes = m_nSentBytes = 0;
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CLiteProxyServerApp object

CLiteProxyServerApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CLiteProxyServerApp initialization

BOOL CLiteProxyServerApp::InitInstance()
{
	CString strAppUID = "CLiteProxyServerApp";
	
	m_uMsgCheckInst = ::RegisterWindowMessage(strAppUID);

	HANDLE hMutex  = ::CreateMutex(NULL, FALSE, strAppUID);
	DWORD dwError = ::GetLastError();
	if(hMutex != NULL)
	{	// Close mutex handle
		::ReleaseMutex(hMutex);
		// Another instance of application is running:
		if(dwError == ERROR_ALREADY_EXISTS || dwError == ERROR_ACCESS_DENIED)
		{
			DWORD dwReceipents = BSM_APPLICATIONS|BSM_ALLDESKTOPS;
			LONG lRet = ::BroadcastSystemMessage(
				BSF_IGNORECURRENTTASK | BSF_FORCEIFHUNG | BSF_POSTMESSAGE, 
				&dwReceipents, 
				m_uMsgCheckInst, 
				0, 
				0);
			return FALSE;
		}
	}

	if (!AfxSocketInit())
	{
		AfxMessageBox(IDP_SOCKETS_INIT_FAILED);
		return FALSE;
	}

	AfxEnableControlContainer();

	// Standard initialization
	// If you are not using these features and wish to reduce the size
	//  of your final executable, you should remove from the following
	//  the specific initialization routines you do not need.

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

	// Change the registry key under which our settings are stored.
	// TODO: You should modify this string to be something appropriate
	// such as the name of your company or organization.
	SetRegistryKey(_T("Local AppWizard-Generated Applications"));

	LoadStdProfileSettings(0);  // Load standard INI file options (including MRU)

	// Register the application's document templates.  Document templates
	//  serve as the connection between documents, frame windows and views.

	CSingleDocTemplate* pDocTemplate;
	pDocTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CLiteProxyServerDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CLiteProxyServerView));
	AddDocTemplate(pDocTemplate);

	// Parse command line for standard shell commands, DDE, file open
	CCommandLineInfo cmdInfo;
	ParseCommandLine(cmdInfo);

	// Dispatch commands specified on the command line
	if (!ProcessShellCommand(cmdInfo))
		return FALSE;

	// The one and only window has been initialized, so show and update it.
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();

	return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CLiteProxyServerApp message handlers

CString Commas(CString str)
{
	int nValue = str.GetLength()-3;
	while(nValue > 0)
		str.Insert(nValue, ','), nValue -= 3;
	return str;
}

CString Commas(int nValue)
{
	CString str;
	str.Format("%d", nValue);
	nValue = str.GetLength()-3;
	while(nValue > 0)
		str.Insert(nValue, ','), nValue -= 3;
	return str;
}

bool CLiteProxyServerApp::GetConnectedState(CString &str)
{
	try
	{
		DWORD dwFlags = 0;
		if(InternetGetConnectedState(&dwFlags, 0) == 0)
		{
			str = "Offline";
			// enable these 2 lines if u want dial up dialog
//			if(InternetAutodial(1, 0) != 0)
//				InternetGetConnectedState(&dwFlags, 0);
			return false;
		}
		if((dwFlags & INTERNET_CONNECTION_MODEM) == INTERNET_CONNECTION_MODEM)
			str = "Modem connection";
		else	if((dwFlags & INTERNET_CONNECTION_LAN) == INTERNET_CONNECTION_LAN)
			str = "LAN connection";
		else	if((dwFlags & INTERNET_CONNECTION_PROXY) == INTERNET_CONNECTION_PROXY)
			str = "Proxy connection";
		else	if((dwFlags & INTERNET_CONNECTION_MODEM_BUSY) == INTERNET_CONNECTION_MODEM_BUSY)
			str = "Modem is busy with a non-Internet connection";
		else	if((dwFlags & 0x10) == 0x10)
			str = "Remote Access Server is installed";
		else	if((dwFlags & 0x20) == 0x20)
			str = "Offline connection";
		else	if((dwFlags & 0x40) == 0x40)
			str = "Internet connection is currently configured";
	}
	catch(...)
	{
		return false;
	}
	return true;
}

BOOL CLiteProxyServerApp::PreTranslateMessage(MSG* pMsg) 
{
	if(pMsg->message == m_uMsgCheckInst)
	{
		if( ::IsWindow( m_pMainWnd->GetSafeHwnd() ) )
		{
			// Does the main window have any popups ? If has, 
			// bring the main window or its popup to the top
			// before showing:

			CWnd* pPopupWnd = m_pMainWnd->GetLastActivePopup();
			pPopupWnd->BringWindowToTop();

			// If window is not visible then show it, else if
			// it is iconic, restore it:

			if( !m_pMainWnd->IsWindowVisible() )
				m_pMainWnd->ShowWindow( SW_SHOWNORMAL ); 
			else if( m_pMainWnd->IsIconic() )
				m_pMainWnd->ShowWindow( SW_RESTORE );
			
			// And finally, bring to top after showing again:

			pPopupWnd->BringWindowToTop();
			pPopupWnd->SetForegroundWindow(); 
		}
	}
	
	return CWinApp::PreTranslateMessage(pMsg);
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author


| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.150428.2 | Last Updated 10 Feb 2005
Article Copyright 2005 by Hatem Mostafa
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid