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/* $Id: VBoxHook.cpp $ */
/** @file
* VBoxHook -- Global windows hook dll
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include <Windows.h>
#include <VBoxHook.h>
#include <VBox/VBoxGuestLib.h>
#include <stdio.h>
#pragma data_seg("SHARED")
static HWINEVENTHOOK hWinEventHook[2] = {0};
static HWINEVENTHOOK hDesktopEventHook = NULL;
#pragma data_seg()
#pragma comment(linker, "/section:SHARED,RWS")
static HANDLE hWinNotifyEvent = 0;
static HANDLE hDesktopNotifyEvent = 0;
#ifdef DEBUG
static void WriteLog(const char *pszFormat, ...);
# define dprintf(a) do { WriteLog a; } while (0)
#else
# define dprintf(a) do {} while (0)
#endif /* !DEBUG */
static void CALLBACK VBoxHandleWinEvent(HWINEVENTHOOK hook, DWORD event, HWND hwnd,
LONG idObject, LONG idChild,
DWORD dwEventThread, DWORD dwmsEventTime)
{
DWORD dwStyle;
if ( idObject != OBJID_WINDOW
|| !hwnd)
return;
dwStyle = GetWindowLong(hwnd, GWL_STYLE);
if (dwStyle & WS_CHILD)
return;
switch(event)
{
case EVENT_OBJECT_LOCATIONCHANGE:
if (!(dwStyle & WS_VISIBLE))
return;
case EVENT_OBJECT_CREATE:
case EVENT_OBJECT_DESTROY:
case EVENT_OBJECT_HIDE:
case EVENT_OBJECT_SHOW:
#ifdef DEBUG
switch(event)
{
case EVENT_OBJECT_LOCATIONCHANGE:
dprintf(("VBoxHandleWinEvent EVENT_OBJECT_LOCATIONCHANGE for window %x\n", hwnd));
break;
case EVENT_OBJECT_CREATE:
dprintf(("VBoxHandleWinEvent EVENT_OBJECT_CREATE for window %x\n", hwnd));
break;
case EVENT_OBJECT_HIDE:
dprintf(("VBoxHandleWinEvent EVENT_OBJECT_HIDE for window %x\n", hwnd));
break;
case EVENT_OBJECT_SHOW:
dprintf(("VBoxHandleWinEvent EVENT_OBJECT_SHOW for window %x\n", hwnd));
break;
case EVENT_OBJECT_DESTROY:
dprintf(("VBoxHandleWinEvent EVENT_OBJECT_DESTROY for window %x\n", hwnd));
break;
}
#endif
if (!hWinNotifyEvent)
{
hWinNotifyEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, VBOXHOOK_GLOBAL_WT_EVENT_NAME);
dprintf(("OpenEvent returned %x (last err=%x)\n", hWinNotifyEvent, GetLastError()));
}
BOOL ret = SetEvent(hWinNotifyEvent);
dprintf(("SetEvent %x returned %d (last error %x)\n", hWinNotifyEvent, ret, GetLastError()));
break;
}
}
static void CALLBACK VBoxHandleDesktopEvent(HWINEVENTHOOK hook, DWORD event, HWND hwnd,
LONG idObject, LONG idChild,
DWORD dwEventThread, DWORD dwmsEventTime)
{
if (!hDesktopNotifyEvent)
{
hDesktopNotifyEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, VBOXHOOK_GLOBAL_DT_EVENT_NAME);
dprintf(("OpenEvent returned %x (last err=%x)\n", hDesktopNotifyEvent, GetLastError()));
}
BOOL ret = SetEvent(hDesktopNotifyEvent);
dprintf(("SetEvent %x returned %d (last error %x)\n", hDesktopNotifyEvent, ret, GetLastError()));
}
BOOL VBoxHookInstallActiveDesktopTracker(HMODULE hDll)
{
if (hDesktopEventHook)
return TRUE;
CoInitialize(NULL);
hDesktopEventHook = SetWinEventHook(EVENT_SYSTEM_DESKTOPSWITCH, EVENT_SYSTEM_DESKTOPSWITCH,
hDll,
VBoxHandleDesktopEvent,
0, 0,
0);
return !!hDesktopEventHook;
}
BOOL VBoxHookRemoveActiveDesktopTracker()
{
if (hDesktopEventHook)
{
UnhookWinEvent(hDesktopEventHook);
CoUninitialize();
}
hDesktopEventHook = 0;
return TRUE;
}
/** Install the global message hook */
BOOL VBoxHookInstallWindowTracker(HMODULE hDll)
{
if (hWinEventHook[0] || hWinEventHook[1])
return TRUE;
CoInitialize(NULL);
hWinEventHook[0] = SetWinEventHook(EVENT_OBJECT_LOCATIONCHANGE, EVENT_OBJECT_LOCATIONCHANGE,
hDll,
VBoxHandleWinEvent,
0, 0,
WINEVENT_INCONTEXT | WINEVENT_SKIPOWNPROCESS);
hWinEventHook[1] = SetWinEventHook(EVENT_OBJECT_CREATE, EVENT_OBJECT_HIDE,
hDll,
VBoxHandleWinEvent,
0, 0,
WINEVENT_INCONTEXT | WINEVENT_SKIPOWNPROCESS);
return !!hWinEventHook[0];
}
/** Remove the global message hook */
BOOL VBoxHookRemoveWindowTracker()
{
if (hWinEventHook[0] && hWinEventHook[1])
{
UnhookWinEvent(hWinEventHook[0]);
UnhookWinEvent(hWinEventHook[1]);
CoUninitialize();
}
hWinEventHook[0] = hWinEventHook[1] = 0;
return TRUE;
}
#ifdef DEBUG
# include <VBox/VBoxGuest.h>
# include <VBox/VMMDev.h>
/**
* dprintf worker using VBoxGuest.sys and VMMDevReq_LogString.
*/
static void WriteLog(const char *pszFormat, ...)
{
/*
* Open VBox guest driver once.
*/
static HANDLE s_hVBoxGuest = INVALID_HANDLE_VALUE;
HANDLE hVBoxGuest = s_hVBoxGuest;
if (hVBoxGuest == INVALID_HANDLE_VALUE)
{
hVBoxGuest = CreateFile(VBOXGUEST_DEVICE_NAME,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL);
if (hVBoxGuest == INVALID_HANDLE_VALUE)
return;
s_hVBoxGuest = hVBoxGuest;
}
/*
* We're apparently afraid of using stack here, so we use a static buffer
* instead and pray we won't be here at the same time on two threads...
*/
static union
{
VMMDevReqLogString Req;
uint8_t abBuf[1024];
} s_uBuf;
vmmdevInitRequest(&s_uBuf.Req.header, VMMDevReq_LogString);
va_list va;
va_start(va, pszFormat);
size_t cch = vsprintf(s_uBuf.Req.szString, pszFormat, va);
va_end(va);
s_uBuf.Req.header.size += (uint32_t)cch;
if (s_uBuf.Req.header.size > sizeof(s_uBuf))
__debugbreak();
DWORD cbReturned;
DeviceIoControl(hVBoxGuest, VBOXGUEST_IOCTL_VMMREQUEST(s_uBuf.Req.size),
&s_uBuf.Req, s_uBuf.Req.header.size,
&s_uBuf.Req, s_uBuf.Req.header.size,
&cbReturned, NULL);
}
#endif /* DEBUG */
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