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barrier/lib/platform/CSynergyHook.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file COPYING that should have accompanied this file.
*
* This package 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.
*/
#include "CSynergyHook.h"
#include "ProtocolTypes.h"
#include <zmouse.h>
//
// debugging compile flag. when not zero the server doesn't grab
// the keyboard when the mouse leaves the server screen. this
// makes it possible to use the debugger (via the keyboard) when
// all user input would normally be caught by the hook procedures.
//
#define NO_GRAB_KEYBOARD 0
//
// extra mouse wheel stuff
//
enum EWheelSupport {
kWheelNone,
kWheelOld,
kWheelWin2000,
kWheelModern
};
// declare extended mouse hook struct. useable on win2k
typedef struct tagMOUSEHOOKSTRUCTWin2000 {
MOUSEHOOKSTRUCT mhs;
DWORD mouseData;
} MOUSEHOOKSTRUCTWin2000;
#if !defined(SM_MOUSEWHEELPRESENT)
#define SM_MOUSEWHEELPRESENT 75
#endif
// X button stuff
#if !defined(WM_XBUTTONDOWN)
#define WM_XBUTTONDOWN 0x020B
#define WM_XBUTTONUP 0x020C
#define WM_XBUTTONDBLCLK 0x020D
#define WM_NCXBUTTONDOWN 0x00AB
#define WM_NCXBUTTONUP 0x00AC
#define WM_NCXBUTTONDBLCLK 0x00AD
#define MOUSEEVENTF_XDOWN 0x0100
#define MOUSEEVENTF_XUP 0x0200
#define XBUTTON1 0x0001
#define XBUTTON2 0x0002
#endif
//
// globals
//
#pragma comment(linker, "-section:shared,rws")
#pragma data_seg("shared")
// all data in this shared section *must* be initialized
static HINSTANCE g_hinstance = NULL;
static DWORD g_processID = 0;
static EWheelSupport g_wheelSupport = kWheelNone;
static UINT g_wmMouseWheel = 0;
static DWORD g_threadID = 0;
static HHOOK g_keyboard = NULL;
static HHOOK g_mouse = NULL;
static HHOOK g_getMessage = NULL;
static HHOOK g_keyboardLL = NULL;
static HHOOK g_mouseLL = NULL;
static bool g_screenSaver = false;
static EHookMode g_mode = kHOOK_DISABLE;
static UInt32 g_zoneSides = 0;
static SInt32 g_zoneSize = 0;
static SInt32 g_xScreen = 0;
static SInt32 g_yScreen = 0;
static SInt32 g_wScreen = 0;
static SInt32 g_hScreen = 0;
static HCURSOR g_cursor = NULL;
static DWORD g_cursorThread = 0;
#pragma data_seg()
// keep linker quiet about floating point stuff. we don't use any
// floating point operations but our includes may define some
// (unused) floating point values.
#ifndef _DEBUG
extern "C" int _fltused=0;
#endif
//
// internal functions
//
static
void
hideCursor(DWORD thread)
{
// we should be running the context of the window who's cursor
// we want to hide so we shouldn't have to attach thread input
// but we'll check to make sure.
g_cursorThread = thread;
if (g_cursorThread != 0) {
DWORD myThread = GetCurrentThreadId();
if (myThread != g_cursorThread)
AttachThreadInput(myThread, g_cursorThread, TRUE);
g_cursor = SetCursor(NULL);
if (myThread != g_cursorThread)
AttachThreadInput(myThread, g_cursorThread, FALSE);
}
}
static
void
restoreCursor()
{
// restore the show cursor in the window we hid it last
if (g_cursor != NULL && g_cursorThread != 0) {
DWORD myThread = GetCurrentThreadId();
if (myThread != g_cursorThread)
AttachThreadInput(myThread, g_cursorThread, TRUE);
SetCursor(g_cursor);
if (myThread != g_cursorThread)
AttachThreadInput(myThread, g_cursorThread, FALSE);
}
g_cursor = NULL;
g_cursorThread = 0;
}
#if !NO_GRAB_KEYBOARD
static
bool
keyboardHookHandler(WPARAM wParam, LPARAM lParam)
{
// forward message to our window. do this whether or not we're
// forwarding events to clients because this'll keep our thread's
// key state table up to date. that's important for querying
// the scroll lock toggle state.
PostThreadMessage(g_threadID, SYNERGY_MSG_KEY, wParam, lParam);
if (g_mode == kHOOK_RELAY_EVENTS) {
// let certain keys pass through
switch (wParam) {
case VK_CAPITAL:
case VK_NUMLOCK:
case VK_SCROLL:
// pass event on. we want to let these through to
// the window proc because otherwise the keyboard
// lights may not stay synchronized.
break;
default:
// discard event
return true;
}
}
return false;
}
#endif
static
bool
mouseHookHandler(WPARAM wParam, SInt32 x, SInt32 y, SInt32 data)
{
switch (wParam) {
case WM_LBUTTONDOWN:
case WM_MBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_XBUTTONDOWN:
case WM_LBUTTONDBLCLK:
case WM_MBUTTONDBLCLK:
case WM_RBUTTONDBLCLK:
case WM_XBUTTONDBLCLK:
case WM_LBUTTONUP:
case WM_MBUTTONUP:
case WM_RBUTTONUP:
case WM_XBUTTONUP:
case WM_NCLBUTTONDOWN:
case WM_NCMBUTTONDOWN:
case WM_NCRBUTTONDOWN:
case WM_NCXBUTTONDOWN:
case WM_NCLBUTTONDBLCLK:
case WM_NCMBUTTONDBLCLK:
case WM_NCRBUTTONDBLCLK:
case WM_NCXBUTTONDBLCLK:
case WM_NCLBUTTONUP:
case WM_NCMBUTTONUP:
case WM_NCRBUTTONUP:
case WM_NCXBUTTONUP:
// always relay the event. eat it if relaying.
PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_BUTTON, wParam, data);
return (g_mode == kHOOK_RELAY_EVENTS);
case WM_MOUSEWHEEL:
if (g_mode == kHOOK_RELAY_EVENTS) {
// relay event
PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_WHEEL, data, 0);
}
return (g_mode == kHOOK_RELAY_EVENTS);
case WM_NCMOUSEMOVE:
case WM_MOUSEMOVE:
if (g_mode == kHOOK_RELAY_EVENTS) {
// we want the cursor to be hidden at all times so we
// hide the cursor on whatever window has it. but then
// we have to show the cursor whenever we leave that
// window (or at some later time before we stop relaying).
// so check the window with the cursor. if it's not the
// same window that had it before then show the cursor
// in the last window and hide it in this window.
DWORD thread = GetCurrentThreadId();
if (thread != g_cursorThread) {
restoreCursor();
hideCursor(thread);
}
// relay and eat event
PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
return true;
}
else if (g_mode == kHOOK_WATCH_JUMP_ZONE) {
// check for mouse inside jump zone
bool inside = false;
if (!inside && (g_zoneSides & kLeftMask) != 0) {
inside = (x < g_xScreen + g_zoneSize);
}
if (!inside && (g_zoneSides & kRightMask) != 0) {
inside = (x >= g_xScreen + g_wScreen - g_zoneSize);
}
if (!inside && (g_zoneSides & kTopMask) != 0) {
inside = (y < g_yScreen + g_zoneSize);
}
if (!inside && (g_zoneSides & kBottomMask) != 0) {
inside = (y >= g_yScreen + g_hScreen - g_zoneSize);
}
// relay the event
PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
// if inside then eat the event
return inside;
}
}
// pass the event
return false;
}
#if !NO_GRAB_KEYBOARD
static
LRESULT CALLBACK
keyboardHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
// handle the message
if (keyboardHookHandler(wParam, lParam)) {
return 1;
}
}
return CallNextHookEx(g_keyboard, code, wParam, lParam);
}
#endif
static
LRESULT CALLBACK
mouseHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
// decode message
const MOUSEHOOKSTRUCT* info = (const MOUSEHOOKSTRUCT*)lParam;
SInt32 x = (SInt32)info->pt.x;
SInt32 y = (SInt32)info->pt.y;
SInt32 w = 0;
if (wParam == WM_MOUSEWHEEL) {
// win2k and other systems supporting WM_MOUSEWHEEL in
// the mouse hook are gratuitously different (and poorly
// documented). if a low-level mouse hook is in place
// it should capture these events so we'll never see
// them.
switch (g_wheelSupport) {
case kWheelModern:
w = static_cast<SInt32>(LOWORD(info->dwExtraInfo));
break;
case kWheelWin2000: {
const MOUSEHOOKSTRUCTWin2000* info2k =
(const MOUSEHOOKSTRUCTWin2000*)lParam;
w = static_cast<SInt32>(HIWORD(info2k->mouseData));
break;
}
}
}
// handle the message. note that we don't handle X buttons
// here. that's okay because they're only supported on
// win2k and winxp and up and on those platforms we'll get
// get the mouse events through the low level hook.
if (mouseHookHandler(wParam, x, y, w)) {
return 1;
}
}
return CallNextHookEx(g_mouse, code, wParam, lParam);
}
static
LRESULT CALLBACK
getMessageHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
if (g_screenSaver) {
MSG* msg = reinterpret_cast<MSG*>(lParam);
if (msg->message == WM_SYSCOMMAND &&
msg->wParam == SC_SCREENSAVE) {
// broadcast screen saver started message
PostThreadMessage(g_threadID,
SYNERGY_MSG_SCREEN_SAVER, TRUE, 0);
}
}
if (g_mode == kHOOK_RELAY_EVENTS) {
MSG* msg = reinterpret_cast<MSG*>(lParam);
if (msg->message == g_wmMouseWheel) {
// post message to our window
PostThreadMessage(g_threadID,
SYNERGY_MSG_MOUSE_WHEEL, msg->wParam, 0);
// zero out the delta in the message so it's (hopefully)
// ignored
msg->wParam = 0;
}
}
}
return CallNextHookEx(g_getMessage, code, wParam, lParam);
}
#if (_WIN32_WINNT >= 0x0400)
//
// low-level keyboard hook -- this allows us to capture and handle
// alt+tab, alt+esc, ctrl+esc, and windows key hot keys. on the down
// side, key repeats are not reported to us.
//
#if !NO_GRAB_KEYBOARD
static
LRESULT CALLBACK
keyboardLLHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
// decode the message
KBDLLHOOKSTRUCT* info = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
WPARAM wParam = info->vkCode;
LPARAM lParam = 1; // repeat code
lParam |= (info->scanCode << 16); // scan code
if (info->flags & LLKHF_EXTENDED) {
lParam |= (1lu << 24); // extended key
}
if (info->flags & LLKHF_ALTDOWN) {
lParam |= (1lu << 29); // context code
}
if (info->flags & LLKHF_UP) {
lParam |= (1lu << 31); // transition
}
// FIXME -- bit 30 should be set if key was already down but
// we don't know that info. as a result we'll never generate
// key repeat events.
// handle the message
if (keyboardHookHandler(wParam, lParam)) {
return 1;
}
}
return CallNextHookEx(g_keyboardLL, code, wParam, lParam);
}
#endif
//
// low-level mouse hook -- this allows us to capture and handle mouse
// events very early. the earlier the better.
//
static
LRESULT CALLBACK
mouseLLHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
// decode the message
MSLLHOOKSTRUCT* info = reinterpret_cast<MSLLHOOKSTRUCT*>(lParam);
SInt32 x = (SInt32)info->pt.x;
SInt32 y = (SInt32)info->pt.y;
SInt32 w = (SInt32)HIWORD(info->mouseData);
// handle the message
if (mouseHookHandler(wParam, x, y, w)) {
return 1;
}
}
return CallNextHookEx(g_mouseLL, code, wParam, lParam);
}
#endif
static
EWheelSupport
getWheelSupport()
{
// get operating system
OSVERSIONINFO info;
info.dwOSVersionInfoSize = sizeof(info);
if (!GetVersionEx(&info)) {
return kWheelNone;
}
// see if modern wheel is present
if (GetSystemMetrics(SM_MOUSEWHEELPRESENT)) {
// note if running on win2k
if (info.dwPlatformId == VER_PLATFORM_WIN32_NT &&
info.dwMajorVersion == 5 &&
info.dwMinorVersion == 0) {
return kWheelWin2000;
}
return kWheelModern;
}
// not modern. see if we've got old-style support.
UINT wheelSupportMsg = RegisterWindowMessage(MSH_WHEELSUPPORT);
HWND wheelSupportWindow = FindWindow(MSH_WHEELMODULE_CLASS,
MSH_WHEELMODULE_TITLE);
if (wheelSupportWindow != NULL && wheelSupportMsg != 0) {
if (SendMessage(wheelSupportWindow, wheelSupportMsg, 0, 0) != 0) {
g_wmMouseWheel = RegisterWindowMessage(MSH_MOUSEWHEEL);
if (g_wmMouseWheel != 0) {
return kWheelOld;
}
}
}
// assume modern. we don't do anything special in this case
// except respond to WM_MOUSEWHEEL messages. GetSystemMetrics()
// can apparently return FALSE even if a mouse wheel is present
// though i'm not sure exactly when it does that (WinME returns
// FALSE for my logitech USB trackball).
return kWheelModern;
}
//
// external functions
//
BOOL WINAPI
DllMain(HINSTANCE instance, DWORD reason, LPVOID)
{
if (reason == DLL_PROCESS_ATTACH) {
DisableThreadLibraryCalls(instance);
if (g_processID == 0) {
g_hinstance = instance;
g_processID = GetCurrentProcessId();
}
}
else if (reason == DLL_PROCESS_DETACH) {
if (g_processID == GetCurrentProcessId()) {
uninstall();
uninstallScreenSaver();
g_processID = 0;
g_hinstance = NULL;
}
}
return TRUE;
}
extern "C" {
int
init(DWORD threadID)
{
assert(g_hinstance != NULL);
// try to open process that last called init() to see if it's
// still running or if it died without cleaning up.
if (g_processID != 0 && g_processID != GetCurrentProcessId()) {
HANDLE process = OpenProcess(STANDARD_RIGHTS_REQUIRED,
FALSE, g_processID);
if (process != NULL) {
// old process (probably) still exists so refuse to
// reinitialize this DLL (and thus steal it from the
// old process).
CloseHandle(process);
return 0;
}
// clean up after old process. the system should've already
// removed the hooks so we just need to reset our state.
g_hinstance = GetModuleHandle("synrgyhk");
g_processID = GetCurrentProcessId();
g_wheelSupport = kWheelNone;
g_threadID = 0;
g_keyboard = NULL;
g_mouse = NULL;
g_getMessage = NULL;
g_keyboardLL = NULL;
g_mouseLL = NULL;
g_screenSaver = false;
}
// save thread id. we'll post messages to this thread's
// message queue.
g_threadID = threadID;
// set defaults
g_mode = kHOOK_DISABLE;
g_zoneSides = 0;
g_zoneSize = 0;
g_xScreen = 0;
g_yScreen = 0;
g_wScreen = 0;
g_hScreen = 0;
g_cursor = NULL;
g_cursorThread = 0;
return 1;
}
int
cleanup(void)
{
assert(g_hinstance != NULL);
if (g_processID == GetCurrentProcessId()) {
g_threadID = 0;
}
return 1;
}
EHookResult
install()
{
assert(g_hinstance != NULL);
assert(g_keyboard == NULL);
assert(g_mouse == NULL);
assert(g_getMessage == NULL || g_screenSaver);
// must be initialized
if (g_threadID == 0) {
return kHOOK_FAILED;
}
// check for mouse wheel support
g_wheelSupport = getWheelSupport();
// install GetMessage hook (unless already installed)
if (g_wheelSupport == kWheelOld && g_getMessage == NULL) {
g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
&getMessageHook,
g_hinstance,
0);
}
// install keyboard hook
#if !NO_GRAB_KEYBOARD
#if (_WIN32_WINNT >= 0x0400)
g_keyboardLL = SetWindowsHookEx(WH_KEYBOARD_LL,
&keyboardLLHook,
g_hinstance,
0);
#endif
if (g_keyboardLL == NULL) {
g_keyboard = SetWindowsHookEx(WH_KEYBOARD,
&keyboardHook,
g_hinstance,
0);
}
#endif
// install mouse hook
#if (_WIN32_WINNT >= 0x0400)
g_mouseLL = SetWindowsHookEx(WH_MOUSE_LL,
&mouseLLHook,
g_hinstance,
0);
#endif
if (g_mouseLL == NULL) {
g_mouse = SetWindowsHookEx(WH_MOUSE,
&mouseHook,
g_hinstance,
0);
}
// check that we got all the hooks we wanted
if ((g_getMessage == NULL && g_wheelSupport == kWheelOld) ||
#if !NO_GRAB_KEYBOARD
(g_keyboardLL == NULL && g_keyboard == NULL) ||
#endif
(g_mouseLL == NULL && g_mouse == NULL)) {
uninstall();
return kHOOK_FAILED;
}
if (g_keyboardLL != NULL || g_mouseLL != NULL) {
return kHOOK_OKAY_LL;
}
return kHOOK_OKAY;
}
int
uninstall(void)
{
assert(g_hinstance != NULL);
// uninstall hooks
if (g_keyboardLL != NULL) {
UnhookWindowsHookEx(g_keyboardLL);
g_keyboardLL = NULL;
}
if (g_mouseLL != NULL) {
UnhookWindowsHookEx(g_mouseLL);
g_mouseLL = NULL;
}
if (g_keyboard != NULL) {
UnhookWindowsHookEx(g_keyboard);
g_keyboard = NULL;
}
if (g_mouse != NULL) {
UnhookWindowsHookEx(g_mouse);
g_mouse = NULL;
}
if (g_getMessage != NULL && !g_screenSaver) {
UnhookWindowsHookEx(g_getMessage);
g_getMessage = NULL;
}
g_wheelSupport = kWheelNone;
// show the cursor
restoreCursor();
return 1;
}
int
installScreenSaver(void)
{
assert(g_hinstance != NULL);
// must be initialized
if (g_threadID == 0) {
return 0;
}
// generate screen saver messages
g_screenSaver = true;
// install hook unless it's already installed
if (g_getMessage == NULL) {
g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
&getMessageHook,
g_hinstance,
0);
}
return (g_getMessage != NULL) ? 1 : 0;
}
int
uninstallScreenSaver(void)
{
assert(g_hinstance != NULL);
// uninstall hook unless the mouse wheel hook is installed
if (g_getMessage != NULL && g_wheelSupport != kWheelOld) {
UnhookWindowsHookEx(g_getMessage);
g_getMessage = NULL;
}
// screen saver hook is no longer installed
g_screenSaver = false;
return 1;
}
void
setSides(UInt32 sides)
{
g_zoneSides = sides;
}
void
setZone(SInt32 x, SInt32 y, SInt32 w, SInt32 h, SInt32 jumpZoneSize)
{
g_zoneSize = jumpZoneSize;
g_xScreen = x;
g_yScreen = y;
g_wScreen = w;
g_hScreen = h;
}
void
setMode(EHookMode mode)
{
if (mode == g_mode) {
// no change
return;
}
g_mode = mode;
if (g_mode != kHOOK_RELAY_EVENTS) {
restoreCursor();
}
}
}
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