Click here to Skip to main content
15,867,756 members
Articles / Desktop Programming / MFC

API hooking revealed

Rate me:
Please Sign up or sign in to vote.
4.94/5 (322 votes)
2 Dec 2002CPOL38 min read 2.7M   64K   1.3K  
The article demonstrates how to build a user mode Win32 API spying system
//---------------------------------------------------------------------------
//
// HookSrv.cpp
//
// SUBSYSTEM:   Hook system
//				
// MODULE:      Hook server
//				
// DESCRIPTION: Defines the class behaviors for the application.
//             
// AUTHOR:		Ivo Ivanov (ivopi@hotmail.com)
// DATE:		2001 December v1.00
//
//---------------------------------------------------------------------------
#include "stdafx.h"
#include "HookSrv.h"
#include "MainFrm.h"
#include "LimitSingleInstance.h"

//---------------------------------------------------------------------------
//
// class CHookSrvApp
//
//---------------------------------------------------------------------------
BEGIN_MESSAGE_MAP(CHookSrvApp, CWinApp)
	//{{AFX_MSG_MAP(CHookSrvApp)
	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
END_MESSAGE_MAP()

//---------------------------------------------------------------------------
//
// CHookSrvApp construction
//
//---------------------------------------------------------------------------

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

//---------------------------------------------------------------------------
//
// Singletons
//
//---------------------------------------------------------------------------
// Application object
CHookSrvApp theApp;
// The one and only CLimitSingleInstance object
CLimitSingleInstance g_SingleInstanceObj("{05CA3573-B449-4e0b-83F5-7FD612E378E9}");


//---------------------------------------------------------------------------
//
// CHookSrvApp initialization
//
//---------------------------------------------------------------------------

BOOL CHookSrvApp::InitInstance()
{
	BOOL bIsAnotherInstanceRunning = 
		g_SingleInstanceObj.IsAnotherInstanceRunning();

	if (!bIsAnotherInstanceRunning)
	{
		#ifdef _AFXDLL
			Enable3dControls();			// Call this when using MFC in a shared DLL
		#else
			Enable3dControlsStatic();	// Call this when linking to MFC statically
		#endif
		// To create the main window, this code creates a new frame window
		// object and then sets it as the application's main window object.
		CMainFrame* pFrame = new CMainFrame;
		m_pMainWnd = pFrame;
		// create and load the frame with its resources
		pFrame->LoadFrame(
			IDR_MAINFRAME,
			WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, 
			NULL,
			NULL
			);

		// The one and only window has been initialized, so show and update it.
		pFrame->ShowWindow(SW_HIDE);
		pFrame->UpdateWindow();
	} // if

	return (!bIsAnotherInstanceRunning);
}

//---------------------------------------------------------------------------
//
// class 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 constructor 
//
//---------------------------------------------------------------------------
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

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

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

//---------------------------------------------------------------------------
// OnAppAbout
//
// App command to run the dialog
//---------------------------------------------------------------------------
void CHookSrvApp::OnAppAbout()
{
	CAboutDlg aboutDlg;
	aboutDlg.DoModal();
}
//----------------------------End of the file -------------------------------

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)


Written By
United States United States
I specialize in OS Internals and Reverse Engineering.
Before joining my current employer I used to run a security blog for malware analysis: http://vinsula.com/security-blog

Comments and Discussions