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- // INT_1Dlg.cpp : implementation file
- //
-
- #include "stdafx.h"
- #include "INT_1.h"
- #include "INT_1Dlg.h"
-
- #ifdef _DEBUG
- #define new DEBUG_NEW
- #undef THIS_FILE
- static char THIS_FILE[] = __FILE__;
- #endif
-
- /////////////////////////////////////////////////////////////////////////////
- // CINT_1Dlg dialog
-
- CINT_1Dlg::CINT_1Dlg(CWnd* pParent /*=NULL*/)
- : CDialog(CINT_1Dlg::IDD, pParent)
- {
- //{{AFX_DATA_INIT(CINT_1Dlg)
- // 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 CINT_1Dlg::DoDataExchange(CDataExchange* pDX)
- {
- CDialog::DoDataExchange(pDX);
- //{{AFX_DATA_MAP(CINT_1Dlg)
- // NOTE: the ClassWizard will add DDX and DDV calls here
- //}}AFX_DATA_MAP
- }
-
- BEGIN_MESSAGE_MAP(CINT_1Dlg, CDialog)
- //{{AFX_MSG_MAP(CINT_1Dlg)
- ON_WM_PAINT()
- ON_WM_QUERYDRAGICON()
- ON_BN_CLICKED(IDC_OK, OnOk)
- //}}AFX_MSG_MAP
- END_MESSAGE_MAP()
-
- /////////////////////////////////////////////////////////////////////////////
- // CINT_1Dlg message handlers
-
- BOOL CINT_1Dlg::OnInitDialog()
- {
- CDialog::OnInitDialog();
-
- // 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
- }
-
- // 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 CINT_1Dlg::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 CINT_1Dlg::OnQueryDragIcon()
- {
- return (HCURSOR) m_hIcon;
- }
-
- void CINT_1Dlg::OnOk()
- {
- __asm
- {
- mov ax,ds
- test al,4 // o jak² operaΦnφ systΘm se jednß?
- jne Win9x // skok = operaΦnφm systΘmem je Windows 9x/Me
-
- xor eax,eax // EAX = 0
- push offset MyHandler // adresa handleru
- push dword ptr fs:[eax] // adresa p°edchozφho handleru
- mov fs:[eax],esp // instalace
- INT 1
- pop dword ptr fs:[0] // obnovenφ p∙vodnφho handleru
- add esp,4 // korekce zßsobnφku
-
- cmp eax,4 // byl SoftICE nalezen?
- jz No_SoftICE
- jmp SoftICE
-
- MyHandler:
- mov edx,[esp+0Ch] // CONTEXT
- mov ecx,[esp+4] // EXCEPTION_RECORD
- mov eax,80000004h // EAX = Φφslo chyby STATUS_SINGLE_STEP, kterou
- // INT 1 vyvolß pokud je SoftICE aktivnφ
- mov ecx,[ecx] // ECX = Φφslo chyby, kterß prßv∞ vznikla
- sub eax,ecx // porovnßnφ hodnot EAX a ECX
- je Ok // pokud se Φφsla chyb shodujφ je SoftICE aktivnφ
- sub ecx,0C0000005h // pokud nenφ SoftICE aktivnφ, INT 1 vyvolß
- // chybu STATUS_ACCESS_VIOLATION(C0000005h)
- je No_NTIce // pokud se Φφsla chyb shodujφ, nenφ SoftICE aktivnφ
- sub eax,eax // doÜlo k jinΘ chyb∞, kterou tento handler nebude zpracovßvat
- inc eax // ExceptionContinueSearch
- jmp Konec
-
- No_NTIce:
- add dword ptr[edx+0B8h],2 // opravenφ chyby p°eskoΦenφm chybnΘ instrukce
- mov [edx+0B0h],4 // ulo₧φ do EAX hodnotu 4 - SoftICE nenalezen
-
- Ok:
- sub eax,eax // ExceptionContinueExecution
-
- Konec:
- ret
- }
- Win9x:
- MessageBox("Tato metoda funguje pouze ve Windows NT/2000/XP",NULL,MB_OK);
- return;
-
- No_SoftICE:
- MessageBox("SoftICE nenalezen",NULL,MB_OK);
- return;
-
- SoftICE:
- MessageBox("SoftICE nalezen",NULL,MB_OK);
- }
-