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// DebuggerDlg.cpp : implementation file
//
#include "stdafx.h"
#include "Debugger.h"
#include "DebuggerDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
BOOL IsDebuggerAttached();
/////////////////////////////////////////////////////////////////////////////
// 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)
//}}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()
/////////////////////////////////////////////////////////////////////////////
// CDebuggerDlg dialog
CDebuggerDlg::CDebuggerDlg(CWnd* pParent /*=NULL*/)
: CDialog(CDebuggerDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CDebuggerDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CDebuggerDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDebuggerDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CDebuggerDlg, CDialog)
//{{AFX_MSG_MAP(CDebuggerDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CDebuggerDlg message handlers
BOOL CDebuggerDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// TODO: Add extra initialization here
return TRUE; // return TRUE unless you set the focus to a control
}
void CDebuggerDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void CDebuggerDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CDebuggerDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CDebuggerDlg::OnOK()
{
LPBYTE lpBuffer = (LPBYTE)0x80000000;
// Give it a bogus buffer that will crash it for sure
ReadMemory(lpBuffer, 1024);
}
BOOL CDebuggerDlg::ReadMemory(LPVOID lpBuffer, DWORD dwSize)
{
// Validate the buffer
if (IsBadWritePtr(lpBuffer, dwSize))
{
// This is bad! Must say something!
if (IsDebuggerAttached())
{
// So we'll break into the debugger
__asm int 3
// If you don't mind the function call overhead, you can call
// DebugBreak();
// instead...
}
else
{
MessageBox("CDebuggerDlg::ReadMemory() : Bad output buffer : lpBuffer!");
}
return FALSE;
}
// Well, we're not really gonna write anything to the buffer,
// it's just a demo ;)
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////
BOOL IsDebuggerAttached()
{
DWORD dw;
__asm
{
push eax // Preserve the registers
push ecx
mov eax, fs:[0x18] // Get the TIB's linear address
mov eax, dword ptr [eax + 0x30]
mov ecx, dword ptr [eax] // Get the whole DWORD
mov dw, ecx // Save it
pop ecx // Restore the registers
pop eax
}
// The 3rd byte is the byte we really need to check for the
// presence of a debugger.
// Check the 3rd byte
return (BOOL)(dw & 0x00010000 ? TRUE : FALSE);
}
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