Ollydbg 2 plugin - How to display DialogBox

September 2, 2016

I tried to create an olly2 plugin with msvc 2010. But I was unable to display a DialogBox,, even after trying. Can some one please look at the code and figure out the problem and help me display the DialogBox correctly....

Here's the code.

main.c

/*
In OllyDbg 2.x the plugin exports are a mixture of _cdecl and _stdcall

Cdecl functions can be declared in the DEF file as FunctionName@Ordinal
Stdcall functions must be declared in the DEF file in the decorated format
FunctionName@<number_of_parameter_bytes>@Ordinal



DllEntryPoint
ODBG2_Pluginquery() ->->->-> real entry point
ODBG2_Plugininit()
mainmenu[] -> function calls
ODBG2_Pluginmenu -> main menu & popup menu
create processing functions

*/

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

// VERY IMPORTANT NOTICE: PLUGINS ARE UNICODE LIBRARIES! COMPILE THEM WITH BYTE
// ALIGNMENT OF STRUCTURES AND DEFAULT UNSIGNED CHAR!
// #define UNICODE
#define _CHAR_UNSIGNED

// Microsoft compilers hate (and maybe justifiably) old-school functions like
// wcscpy() that may cause buffer overflow and all related dangers; Still, I
// don't want to see all these bloody warnings
#define _CRT_SECURE_NO_DEPRECATE

#include <windows.h>
#include "plugin.h"
#include "resource.h"


#define PLUGINNAME		L"Olly2isDnPE"		// Unique plugin name
#define VERSION			L"2.00.01"			// Plugin version

static HINSTANCE hdllinst = NULL;           // DLL instance

static int menuHandler(t_table *pTable, wchar_t *pName, ulong index, int mode);
void displayDialogBox();
BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);
void disLastError();
void aboutIsDebug();


// 1.
// Entry point of the plugin DLL. Many system calls require DLL instance
// which is passed to DllEntryPoint() as one of parameters. Remember it. Do
// not make any initializations here, preferrable way is to place them into
// ODBG_Plugininit() and cleanup in ODBG_Plugindestroy().
BOOL WINAPI DllEntryPoint(HINSTANCE hinstDLL, DWORD reason, LPVOID reserved) {
	if(reason == DLL_PROCESS_ATTACH)
		hdllinst = hinstDLL;			// Mark plugin instance
	return 1;							// Report success
	// return TRUE;
};


// 2.
// ODBG2_Pluginquery() is a "must" for valid OllyDbg plugin. It must check
// whether given OllyDbg version is correctly supported, and return 0 if not.
// Then it should fill plugin name and plugin version (as UNICODE strings) and
// return version of expected plugin interface. If OllyDbg decides that this
// plugin is not compatible, it will be unloaded. Plugin name identifies it
// in the Plugins menu. This name is max. 31 alphanumerical UNICODE characters
// or spaces + terminating L'\0' long. To keep life easy for users, name must
// be descriptive and correlate with the name of DLL. Parameter features is
// reserved for the future. I plan that features[0] will contain the number
// of additional entries in features[]. Attention, this function should not
// call any API functions: they may be incompatible with the version of plugin!
extc int __cdecl ODBG2_Pluginquery(int ollydbgversion, ulong *features, wchar_t pluginname[SHORTNAME], wchar_t pluginversion[SHORTNAME]) {
	// Check whether OllyDbg has compatible version. This plugin uses only the
	// most basic functions, so this check is done pro forma, just to remind of
	// this option.
	if(ollydbgversion < 201)
		return 0;
	// Report name and version to OllyDbg
	wcscpy(pluginname, PLUGINNAME);			// Name of plugin
	wcscpy(pluginversion, VERSION);			// Version of plugin
	return PLUGIN_VERSION;					// Expected API version
};


// 3.
// Optional entry, called immediately after ODBG2_Pluginquery(). Plugin should
// make one-time initializations and allocate resources. On error, it must
// clean up and return -1. On success, it must return 0.
extc int __cdecl ODBG2_Plugininit(void) {
	// Report success
	Addtolist(0, DRAW_HILITE, L"IsDebugPresent & PE Viewer for Olly2");
	// Addtolist(0, DRAW_HILITE, L"IsDebugPresent status - ");
	return 0;
};


// 4.
// Function is called when user opens new or restarts current application.
// Plugin should reset internal variables and data structures to the initial
// state.
extc void __cdecl ODBG2_Pluginreset(void) {
	// restore isDebug
};


// 5.
// OllyDbg calls this optional function when user wants to terminate OllyDbg.
// All MDI windows created by plugins still exist. Function must return 0 if
// it is safe to terminate. Any non-zero return will stop closing sequence. Do
// not misuse this possibility! Always inform user about the reasons why
// termination is not good and ask for his decision! Attention, don't make any
// unrecoverable actions for the case that some other plugin will decide that
// OllyDbg should continue running.
extc int __cdecl ODBG2_Pluginclose(void) {
	return 0;
};


// 6.
// OllyDbg calls this optional function once on exit. At this moment, all MDI
// windows created by plugin are already destroyed (and received WM_DESTROY
// messages). Function must free all internally allocated resources, like
// window classes, files, memory etc.
extc void __cdecl ODBG2_Plugindestroy(void) {
};


// 7.
//
// Menu processing functions
//
// Plugin menu that will appear in the main OllyDbg menu. Note that this menu
// must be static and must be kept for the whole duration of the debugging
// session.
// 
// We create an array with the description of all menu items and their processing functions
//
//
// static int ToggleFunc(t_table *pt, wchar_t *name, ulong index, int mode)
// static int aboutIsDebug(t_table *pt, wchar_t *name, ulong index, int mode)
//
// pt -> pointer to table
// name
// index
// mode -> 
//

static t_menu mainmenu[] = {
	{ L"PE Viewer",
	L"simple PE Viewer",
	K_NONE, menuHandler, NULL, MENU_PEVIEWER },
	{ L"|About",
	L"About IsDebug plugin",
	K_NONE, menuHandler, NULL, MENU_ABOUT },
	{ NULL, NULL, K_NONE, NULL, NULL, 0 }
};



// 8.
// Adds items either to main OllyDbg menu (type=PWM_MAIN) or to popup menu in
// one of the standard OllyDbg windows, like PWM_DISASM or PWM_MEMORY. When
// type matches, plugin should return address of menu. When there is no menu of
// given type, it must return NULL. If menu includes single item, it will
// appear directly in menu, otherwise OllyDbg will create a submenu with the
// name of plugin. Therefore, if there is only one item, make its name as
// descriptive as possible.
//
// function for returning menu for OllyDbg
//
extc t_menu * __cdecl ODBG2_Pluginmenu(wchar_t *type) {
	// if(wcscmp(type,PWM_MAIN)==0 || wcscmp(type,PWM_DISASM)==0){
	if(wcscmp(type, PWM_MAIN)==0 || wcscmp(type, PWM_DISASM)==0) {
		// Main menu
		return mainmenu;
	}
	return NULL;								// No menu
};


// create processing functions
// 9.
////////////////////////////////////////////////////////////////////////////////
////////////////// PLUGIN MENUS EMBEDDED INTO OLLYDBG WINDOWS //////////////////

// Menu processing functions are called twice. First time (mode=MENU_VERIFY)
// OllyDbg asks to verify whether corresponding menu item applies or not. If
// necessary, menu function may change menu text (parameter name, up to TEXTLEN
// UNICODE characters). It must return one of the following codes:
//
//   MENU_ABSENT:     menu item does not apply and should not be present in
//                    the menu;
//   MENU_NORMAL:     menu item appears in the menu;
//   MENU_CHECKED:    menu item appears in the menu and has attached checkmark;
//   MENU_CHKPARENT:  menu item appears in the menu and has attached checkmark.
//                    Additionally, attaches checkmark to the parent item in
//                    menu on the previous level. This feature does not work in
//                    the main menu;
//   MENU_SHORTCUT:   menu item does not appear in the menu but is active and
//                    participates in the search for keyboard shortcut;
//   MENU_GRAYED:     item is present in the menu but disabled. This style is
//                    not compatible with OllyDbg's look-and-feel, use it only
//                    if absolutely necessary due to the menu logic.
//
// When menu item is selected (mouseclick or keyboard shortcut), menu function
// is called for the second time (mode=MENU_EXECUTE, name is undefined). At
// this moment, all threads of the debugged application are suspended. Function
// must make all necessary actions and return one of the following codes:
//
//   MENU_REDRAW:     this action has global impact, all OllyDbg windows must
//                    be updated. OllyDbg broadcasts WM_USER_CHGALL;
//   MENU_NOREDRAW:   no redrawing is necessary.
//
// If processing is lengthy and application should continue execution, use
// Resumeallthreads() at entry to the MENU_EXECUTE block and Suspendallthreads()
// on exit. Note that MENU_ABSENT and MENU_NOREDRAW are interchangeable.
//
// Parameter index allows to use single menu function with several similar menu
// items.
//
// Note that OllyDbg uses menu structures to process keyboard shortcuts. It is
// done automatically, without the need to pay additional attention.

// Menu function of main menu, opens or brings to top list of bookmarks.
static int menuHandler(t_table *pTable, wchar_t *pName, ulong index, int mode) {
	UNREFERENCED_PARAMETER(pTable);
	UNREFERENCED_PARAMETER(pName);

	switch(mode) {
	case MENU_VERIFY:
		return MENU_NORMAL;
	case MENU_EXECUTE:
		switch (index) {
		case MENU_PEVIEWER:
			displayDialogBox();
			break;
		case MENU_ABOUT:
			aboutIsDebug();
			break;
		}
		return MENU_NOREDRAW;
	}
	return MENU_ABSENT;
}

void displayDialogBox() {
	// if(DialogBox(hdllinst, MAKEINTRESOURCE(IDD_ABOUT), NULL, AboutDlgProc) == -1)
	if(DialogBox(hdllinst, MAKEINTRESOURCE(IDD_ABOUT), hwollymain, AboutDlgProc) == -1)
		disLastError();
}

BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
	// HWND - handle to the dialog box
	switch(Message) {
		case WM_INITDIALOG:
			return TRUE;
		case WM_COMMAND:				// user has chosen BUTTON item from the dialog box
			switch(LOWORD(wParam)) {
				case IDOK:
					EndDialog(hwnd, IDOK);
				break;
				case IDCANCEL:
					EndDialog(hwnd, IDCANCEL);
				break;
			}
		break;
		default:
			return FALSE;
	}
	return TRUE;
}

void disLastError() {
	TCHAR *messageBuffer = NULL;

	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
		NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&messageBuffer, 0, NULL);

	MessageBox(NULL, (LPCTSTR)messageBuffer, TEXT("LastError"), MB_OK);
	LocalFree(messageBuffer);
}

// 10.
void aboutIsDebug() {
	int n;
	wchar_t s[TEXTLEN];

	// Debuggee should continue execution while message box is displayed.
	Resumeallthreads();
	// In this case, Swprintf() would be as good as a sequence of StrcopyW(),
	// but secure copy makes buffer overflow impossible.
	n=StrcopyW(s, TEXTLEN, L"Olly2isDnPE plugin v");
	n+=StrcopyW(s+n, TEXTLEN-n, VERSION);
	// COPYRIGHT POLICY: This bookmark plugin is an open-source freeware. It's
	// just a sample. The copyright below is also just a sample and applies to
	// the unmodified sample code only. Replace or remove copyright message if
	// you make ANY changes to this code!
	n+=StrcopyW(s+n, TEXTLEN-n, L"\nCopyright (C) 2001-2012 Oleh Yuschuk");
	// The conditionals below are here to verify that this plugin can be
	// compiled with all supported compilers. They are not necessary in the
	// final code.
#if defined(__BORLANDC__)
	n+=StrcopyW(s+n,TEXTLEN-n,L"\n\nCompiled with Borland (R) ");
#elif defined(_MSC_VER)
	n+=StrcopyW(s+n, TEXTLEN-n, L"\n\nCompiled with Microsoft (R) ");
#elif defined(__MINGW32__)
	n+=StrcopyW(s+n,TEXTLEN-n,L"\n\nCompiled with MinGW32 ");
#else
	n+=StrcopyW(s+n,TEXTLEN-n,L"\n\nCompiled with ");
#endif

#ifdef __cplusplus
	StrcopyW(s+n, TEXTLEN-n, L"C++ compiler");
#else
	StrcopyW(s+n,TEXTLEN-n,L"C compiler");
#endif

	MessageBox(hwollymain, s, L"Olly2isDnPE plugin", MB_OK|MB_ICONINFORMATION);
	// Suspendallthreads() and Resumeallthreads() must be paired, even if they
	// are called in inverse order!
	Suspendallthreads();

};

resource.h

#define IDD_ABOUT              101
#define IDC_STATIC             -1
#define MENU_PEVIEWER          11
#define MENU_ABOUT             12

resource.rc

// Microsoft Visual C++ generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// English (United States) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE 
BEGIN
    "resource.h\0"
END

2 TEXTINCLUDE 
BEGIN
    "#include ""afxres.h""\r\n"
    "\0"
END

3 TEXTINCLUDE 
BEGIN
    "\r\n"
    "\0"
END

#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_ABOUT DIALOGEX 0, 0, 239, 66
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "My About Box"
FONT 8, "MS Sans Serif", 0, 0, 0x0
BEGIN
    DEFPUSHBUTTON   "OK",IDOK,174,18,50,14
    PUSHBUTTON      "Cancel",IDCANCEL,174,35,50,14
    GROUPBOX        "About this program...",IDC_STATIC,7,7,225,52
    CTEXT           "An example program showing how to use Dialog Boxes\r\n\r\nby theForger",IDC_STATIC,16,18,144,33
END


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO
BEGIN
    IDD_DIALOG1, DIALOG
    BEGIN
        LEFTMARGIN, 7
        RIGHTMARGIN, 309
        TOPMARGIN, 7
        BOTTOMMARGIN, 176
    END
END
#endif    // APSTUDIO_INVOKED

#endif    // English (United States) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

The code simply display the Forger's DialogBox.... I still learning.

The dll is created OK and About MessageBox is working OK

Edited September 2, 2016 by HellRaider
added more info

September 4, 2016

Hello

I have debug your plugin

DialogBox(hdllinst, MAKEINTRESOURCE(IDD_ABOUT), hwollymain, AboutDlgProc

Your Hinstance is 0 you must define the DllEntryPoint in your project settings.

Choose Properties -> Configuration Properties -> Linker -> Advanced -> Entry Point add DllEntryPoint

Clean your project and Recompile it.

Greets,

Edited September 4, 2016 by ragdog

September 4, 2016

@ragdog

Thanks a lot, it worked like a charm....

Though, I have some queries.

1. I coded "Hide Debugger" for Olly2 {studied original of Asterix} and it worked. But there I did not define the DllEntryPoint in the project settings (Properties -> Configuration Properties -> Linker -> Advanced -> Entry Point add DllEntryPoint) and it still worked. Why? (Shall I PM you the code??)

2. How did you find out the error. A little peek into, as to how did you debug the dll. (how to get that hInstance is 0)

(New to msvc, so I am trying to understand things)

Thanks anyways.

Edited September 4, 2016 by HellRaider

September 11, 2016

Hello

I have debug this dll

The best way fo debug your plugin is with Debug Macros and send this result to a Console .

Or the a other way is

Copy your plugin to your Ollydbg2 and load Ollydbg2 in a other debugger and run it.
Now can you go in your plugin or set a Beakpoint on DialogBoxParamA or DialogBoxParamW.

Quote

(Shall I PM you the code??)

Yes you can it.

October 8, 2016

Thank you, will try both the methods...

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Ollydbg 2 plugin - How to display DialogBox

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