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An Adventure: How to implement a Firewall-Hook Driver?

, 28 Oct 2004
Firewall-Hook driver is a completely unknown method to develop simple packet filtering applications. With this article, I want to tell you how this driver works and what you need to do to use it in your applications.
fwhookdrv_bin.zip
FirewallApp.exe
FwHookDrv.sys
fwhookdrv_src.zip
FirewallHooK
FirewallApp.dsp
FirewallApp.dsw
res
CVS
Entries
Entries.Extra
Repository
Root
FirewallApp.ico
FirewallAppDoc.ico
newtoolbar.bmp
Toolbar.bmp
Driver
buildchk_wxp_x86.log
Debug
FwHookDrv.sys
vc60.idb
FwHookDrv.dsp
FwHookDrv.dsw
makefile
objchk_wxp_x86
i386
fwhookdrv.obj
FwHookDrv.pdb
FwHookDrv.sys
_objects.mac
sources
FwHookDrv.sys
FirewallApp.exe
// FirewallApp.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "FirewallApp.h"

#include "MainFrm.h"
#include "FirewallAppDoc.h"
#include "FirewallAppView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CFirewallAppApp

BEGIN_MESSAGE_MAP(CFirewallAppApp, CWinApp)
	//{{AFX_MSG_MAP(CFirewallAppApp)
	ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
	// Standard file based document commands
	ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)
	ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)
	// Standard print setup command
	ON_COMMAND(ID_FILE_PRINT_SETUP, CWinApp::OnFilePrintSetup)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFirewallAppApp construction

CFirewallAppApp::CFirewallAppApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CFirewallAppApp object

CFirewallAppApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CFirewallAppApp initialization

BOOL CFirewallAppApp::InitInstance()
{
	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("FirewallApp"));

	LoadStdProfileSettings();  // 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(CFirewallAppDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CFirewallAppView));
	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;
}


/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
		// No message handlers
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

// App command to run the dialog
void CFirewallAppApp::OnAppAbout()
{
	CAboutDlg aboutDlg;
	aboutDlg.DoModal();
}

/////////////////////////////////////////////////////////////////////////////
// CFirewallAppApp message handlers

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About the Author

Jesus Oliva
Chief Technology Officer
Spain Spain
To summarize: learn, learn, learn... and then try to remember something I.... I don't Know what i have to remember...
 
http://www.olivacorner.com

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