mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-11-22 08:04:04 +01:00
387 lines
11 KiB
C++
387 lines
11 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This software is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this software; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
* USA.
|
|
*/
|
|
|
|
// -=- WMHooks.cxx
|
|
|
|
#include <os/Mutex.h>
|
|
#include <os/Thread.h>
|
|
|
|
#include <rfb_win32/WMHooks.h>
|
|
#include <rfb_win32/Service.h>
|
|
#include <rfb_win32/MsgWindow.h>
|
|
#include <rfb_win32/IntervalTimer.h>
|
|
#include <rfb/LogWriter.h>
|
|
|
|
#include <list>
|
|
|
|
using namespace rfb;
|
|
using namespace rfb::win32;
|
|
|
|
static LogWriter vlog("WMHooks");
|
|
|
|
|
|
static HMODULE hooksLibrary;
|
|
|
|
typedef UINT (*WM_Hooks_WMVAL_proto)();
|
|
static WM_Hooks_WMVAL_proto WM_Hooks_WindowChanged;
|
|
static WM_Hooks_WMVAL_proto WM_Hooks_WindowBorderChanged;
|
|
static WM_Hooks_WMVAL_proto WM_Hooks_WindowClientAreaChanged;
|
|
static WM_Hooks_WMVAL_proto WM_Hooks_RectangleChanged;
|
|
#ifdef _DEBUG
|
|
static WM_Hooks_WMVAL_proto WM_Hooks_Diagnostic;
|
|
#endif
|
|
|
|
typedef BOOL (*WM_Hooks_Install_proto)(DWORD owner, DWORD thread);
|
|
static WM_Hooks_Install_proto WM_Hooks_Install;
|
|
typedef BOOL (*WM_Hooks_Remove_proto)(DWORD owner);
|
|
static WM_Hooks_Remove_proto WM_Hooks_Remove;
|
|
#ifdef _DEBUG
|
|
typedef void (*WM_Hooks_SetDiagnosticRange_proto)(UINT min, UINT max);
|
|
static WM_Hooks_SetDiagnosticRange_proto WM_Hooks_SetDiagnosticRange;
|
|
#endif
|
|
|
|
typedef BOOL (*WM_Hooks_EnableRealInputs_proto)(BOOL pointer, BOOL keyboard);
|
|
static WM_Hooks_EnableRealInputs_proto WM_Hooks_EnableRealInputs;
|
|
|
|
|
|
static void LoadHooks()
|
|
{
|
|
if (hooksLibrary != NULL)
|
|
return;
|
|
|
|
hooksLibrary = LoadLibrary("wm_hooks.dll");
|
|
if (hooksLibrary == NULL)
|
|
return;
|
|
|
|
WM_Hooks_WindowChanged = (WM_Hooks_WMVAL_proto)GetProcAddress(hooksLibrary, "WM_Hooks_WindowChanged");
|
|
if (WM_Hooks_WindowChanged == NULL)
|
|
goto error;
|
|
WM_Hooks_WindowBorderChanged = (WM_Hooks_WMVAL_proto)GetProcAddress(hooksLibrary, "WM_Hooks_WindowBorderChanged");
|
|
if (WM_Hooks_WindowBorderChanged == NULL)
|
|
goto error;
|
|
WM_Hooks_WindowClientAreaChanged = (WM_Hooks_WMVAL_proto)GetProcAddress(hooksLibrary, "WM_Hooks_WindowClientAreaChanged");
|
|
if (WM_Hooks_WindowClientAreaChanged == NULL)
|
|
goto error;
|
|
WM_Hooks_RectangleChanged = (WM_Hooks_WMVAL_proto)GetProcAddress(hooksLibrary, "WM_Hooks_RectangleChanged");
|
|
if (WM_Hooks_RectangleChanged == NULL)
|
|
goto error;
|
|
#ifdef _DEBUG
|
|
WM_Hooks_Diagnostic = (WM_Hooks_WMVAL_proto)GetProcAddress(hooksLibrary, "WM_Hooks_Diagnostic");
|
|
if (WM_Hooks_Diagnostic == NULL)
|
|
goto error;
|
|
#endif
|
|
|
|
WM_Hooks_Install = (WM_Hooks_Install_proto)GetProcAddress(hooksLibrary, "WM_Hooks_Install");
|
|
if (WM_Hooks_Install == NULL)
|
|
goto error;
|
|
WM_Hooks_Remove = (WM_Hooks_Remove_proto)GetProcAddress(hooksLibrary, "WM_Hooks_Remove");
|
|
if (WM_Hooks_Remove == NULL)
|
|
goto error;
|
|
#ifdef _DEBUG
|
|
WM_Hooks_SetDiagnosticRange = (WM_Hooks_SetDiagnosticRange_proto)GetProcAddress(hooksLibrary, "WM_Hooks_SetDiagnosticRange");
|
|
if (WM_Hooks_SetDiagnosticRange == NULL)
|
|
goto error;
|
|
#endif
|
|
|
|
WM_Hooks_EnableRealInputs = (WM_Hooks_EnableRealInputs_proto)GetProcAddress(hooksLibrary, "WM_Hooks_EnableRealInputs");
|
|
if (WM_Hooks_EnableRealInputs == NULL)
|
|
goto error;
|
|
|
|
return;
|
|
|
|
error:
|
|
FreeLibrary(hooksLibrary);
|
|
hooksLibrary = NULL;
|
|
}
|
|
|
|
|
|
class WMHooksThread : public os::Thread {
|
|
public:
|
|
WMHooksThread() : active(true), thread_id(-1) { }
|
|
void stop();
|
|
DWORD getThreadId() { return thread_id; }
|
|
protected:
|
|
virtual void worker();
|
|
protected:
|
|
bool active;
|
|
DWORD thread_id;
|
|
};
|
|
|
|
static WMHooksThread* hook_mgr = 0;
|
|
static std::list<WMHooks*> hooks;
|
|
static os::Mutex hook_mgr_lock;
|
|
|
|
|
|
static bool StartHookThread() {
|
|
if (hook_mgr)
|
|
return true;
|
|
if (hooksLibrary == NULL)
|
|
return false;
|
|
vlog.debug("creating thread");
|
|
hook_mgr = new WMHooksThread();
|
|
hook_mgr->start();
|
|
while (hook_mgr->getThreadId() == (DWORD)-1)
|
|
Sleep(0);
|
|
vlog.debug("installing hooks");
|
|
if (!WM_Hooks_Install(hook_mgr->getThreadId(), 0)) {
|
|
vlog.error("failed to initialise hooks");
|
|
hook_mgr->stop();
|
|
delete hook_mgr;
|
|
hook_mgr = 0;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void StopHookThread() {
|
|
if (!hook_mgr)
|
|
return;
|
|
if (!hooks.empty())
|
|
return;
|
|
vlog.debug("closing thread");
|
|
hook_mgr->stop();
|
|
delete hook_mgr;
|
|
hook_mgr = 0;
|
|
}
|
|
|
|
|
|
static bool AddHook(WMHooks* hook) {
|
|
vlog.debug("adding hook");
|
|
os::AutoMutex a(&hook_mgr_lock);
|
|
if (!StartHookThread())
|
|
return false;
|
|
hooks.push_back(hook);
|
|
return true;
|
|
}
|
|
|
|
static bool RemHook(WMHooks* hook) {
|
|
{
|
|
vlog.debug("removing hook");
|
|
os::AutoMutex a(&hook_mgr_lock);
|
|
hooks.remove(hook);
|
|
}
|
|
StopHookThread();
|
|
return true;
|
|
}
|
|
|
|
static void NotifyHooksRegion(const Region& r) {
|
|
os::AutoMutex a(&hook_mgr_lock);
|
|
std::list<WMHooks*>::iterator i;
|
|
for (i=hooks.begin(); i!=hooks.end(); i++)
|
|
(*i)->NotifyHooksRegion(r);
|
|
}
|
|
|
|
|
|
void
|
|
WMHooksThread::worker() {
|
|
// Obtain message ids for all supported hook messages
|
|
UINT windowMsg = WM_Hooks_WindowChanged();
|
|
UINT clientAreaMsg = WM_Hooks_WindowClientAreaChanged();
|
|
UINT borderMsg = WM_Hooks_WindowBorderChanged();
|
|
UINT rectangleMsg = WM_Hooks_RectangleChanged();
|
|
#ifdef _DEBUG
|
|
UINT diagnosticMsg = WM_Hooks_Diagnostic();
|
|
#endif
|
|
MSG msg;
|
|
RECT wrect;
|
|
HWND hwnd;
|
|
int count = 0;
|
|
|
|
// Update delay handling
|
|
// We delay updates by 40-80ms, so that the triggering application has time to
|
|
// actually complete them before we notify the hook callbacks & they go off
|
|
// capturing screen state.
|
|
const int updateDelayMs = 40;
|
|
MsgWindow updateDelayWnd(_T("WMHooks::updateDelay"));
|
|
IntervalTimer updateDelayTimer(updateDelayWnd.getHandle(), 1);
|
|
Region updates[2];
|
|
int activeRgn = 0;
|
|
|
|
vlog.debug("starting hook thread");
|
|
|
|
thread_id = GetCurrentThreadId();
|
|
|
|
while (active && GetMessage(&msg, NULL, 0, 0)) {
|
|
count++;
|
|
|
|
if (msg.message == WM_TIMER) {
|
|
// Actually notify callbacks of graphical updates
|
|
NotifyHooksRegion(updates[1-activeRgn]);
|
|
if (updates[activeRgn].is_empty())
|
|
updateDelayTimer.stop();
|
|
activeRgn = 1-activeRgn;
|
|
updates[activeRgn].clear();
|
|
|
|
} else if (msg.message == windowMsg) {
|
|
// An entire window has (potentially) changed
|
|
hwnd = (HWND) msg.lParam;
|
|
if (IsWindow(hwnd) && IsWindowVisible(hwnd) && !IsIconic(hwnd) &&
|
|
GetWindowRect(hwnd, &wrect) && !IsRectEmpty(&wrect)) {
|
|
updates[activeRgn].assign_union(Rect(wrect.left, wrect.top,
|
|
wrect.right, wrect.bottom));
|
|
updateDelayTimer.start(updateDelayMs);
|
|
}
|
|
|
|
} else if (msg.message == clientAreaMsg) {
|
|
// The client area of a window has (potentially) changed
|
|
hwnd = (HWND) msg.lParam;
|
|
if (IsWindow(hwnd) && IsWindowVisible(hwnd) && !IsIconic(hwnd) &&
|
|
GetClientRect(hwnd, &wrect) && !IsRectEmpty(&wrect))
|
|
{
|
|
POINT pt = {0,0};
|
|
if (ClientToScreen(hwnd, &pt)) {
|
|
updates[activeRgn].assign_union(Rect(wrect.left+pt.x, wrect.top+pt.y,
|
|
wrect.right+pt.x, wrect.bottom+pt.y));
|
|
updateDelayTimer.start(updateDelayMs);
|
|
}
|
|
}
|
|
|
|
} else if (msg.message == borderMsg) {
|
|
hwnd = (HWND) msg.lParam;
|
|
if (IsWindow(hwnd) && IsWindowVisible(hwnd) && !IsIconic(hwnd) &&
|
|
GetWindowRect(hwnd, &wrect) && !IsRectEmpty(&wrect))
|
|
{
|
|
Region changed(Rect(wrect.left, wrect.top, wrect.right, wrect.bottom));
|
|
RECT crect;
|
|
POINT pt = {0,0};
|
|
if (GetClientRect(hwnd, &crect) && ClientToScreen(hwnd, &pt) &&
|
|
!IsRectEmpty(&crect))
|
|
{
|
|
changed.assign_subtract(Rect(crect.left+pt.x, crect.top+pt.y,
|
|
crect.right+pt.x, crect.bottom+pt.y));
|
|
}
|
|
if (!changed.is_empty()) {
|
|
updates[activeRgn].assign_union(changed);
|
|
updateDelayTimer.start(updateDelayMs);
|
|
}
|
|
}
|
|
} else if (msg.message == rectangleMsg) {
|
|
Rect r = Rect(LOWORD(msg.wParam), HIWORD(msg.wParam),
|
|
LOWORD(msg.lParam), HIWORD(msg.lParam));
|
|
if (!r.is_empty()) {
|
|
updates[activeRgn].assign_union(r);
|
|
updateDelayTimer.start(updateDelayMs);
|
|
}
|
|
|
|
#ifdef _DEBUG
|
|
} else if (msg.message == diagnosticMsg) {
|
|
vlog.info("DIAG msg=%x(%d) wnd=%lx",
|
|
(unsigned)msg.wParam, (int)msg.wParam,
|
|
(unsigned long)msg.lParam);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
vlog.debug("stopping hook thread - processed %d events", count);
|
|
WM_Hooks_Remove(getThreadId());
|
|
}
|
|
|
|
void
|
|
WMHooksThread::stop() {
|
|
vlog.debug("stopping WMHooks thread");
|
|
active = false;
|
|
PostThreadMessage(thread_id, WM_QUIT, 0, 0);
|
|
vlog.debug("waiting for WMHooks thread");
|
|
wait();
|
|
}
|
|
|
|
// -=- WMHooks class
|
|
|
|
rfb::win32::WMHooks::WMHooks() : updateEvent(0) {
|
|
LoadHooks();
|
|
}
|
|
|
|
rfb::win32::WMHooks::~WMHooks() {
|
|
RemHook(this);
|
|
}
|
|
|
|
bool rfb::win32::WMHooks::setEvent(HANDLE ue) {
|
|
if (updateEvent)
|
|
RemHook(this);
|
|
updateEvent = ue;
|
|
return AddHook(this);
|
|
}
|
|
|
|
bool rfb::win32::WMHooks::getUpdates(UpdateTracker* ut) {
|
|
if (!updatesReady) return false;
|
|
os::AutoMutex a(&hook_mgr_lock);
|
|
updates.copyTo(ut);
|
|
updates.clear();
|
|
updatesReady = false;
|
|
return true;
|
|
}
|
|
|
|
#ifdef _DEBUG
|
|
void
|
|
rfb::win32::WMHooks::setDiagnosticRange(UINT min, UINT max) {
|
|
WM_Hooks_SetDiagnosticRange(min, max);
|
|
}
|
|
#endif
|
|
|
|
void rfb::win32::WMHooks::NotifyHooksRegion(const Region& r) {
|
|
// hook_mgr_lock is already held at this point
|
|
updates.add_changed(r);
|
|
updatesReady = true;
|
|
SetEvent(updateEvent);
|
|
}
|
|
|
|
|
|
// -=- WMBlockInput class
|
|
|
|
rfb::win32::WMBlockInput::WMBlockInput() : active(false) {
|
|
LoadHooks();
|
|
}
|
|
|
|
rfb::win32::WMBlockInput::~WMBlockInput() {
|
|
blockInputs(false);
|
|
}
|
|
|
|
static bool blocking = false;
|
|
static bool blockRealInputs(bool block_) {
|
|
// NB: Requires blockMutex to be held!
|
|
if (hooksLibrary == NULL)
|
|
return false;
|
|
if (block_) {
|
|
if (blocking)
|
|
return true;
|
|
// Enable blocking
|
|
if (!WM_Hooks_EnableRealInputs(false, false))
|
|
return false;
|
|
blocking = true;
|
|
}
|
|
if (blocking) {
|
|
WM_Hooks_EnableRealInputs(true, true);
|
|
blocking = false;
|
|
}
|
|
return block_ == blocking;
|
|
}
|
|
|
|
static os::Mutex blockMutex;
|
|
static int blockCount = 0;
|
|
|
|
bool rfb::win32::WMBlockInput::blockInputs(bool on) {
|
|
if (active == on) return true;
|
|
os::AutoMutex a(&blockMutex);
|
|
int newCount = on ? blockCount+1 : blockCount-1;
|
|
if (!blockRealInputs(newCount > 0))
|
|
return false;
|
|
blockCount = newCount;
|
|
active = on;
|
|
return true;
|
|
}
|