843 lines
20 KiB
C++
843 lines
20 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2002 Chris Schoeneman
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "CSynergyHook.h"
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#include "ProtocolTypes.h"
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#include <zmouse.h>
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//
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// debugging compile flag. when not zero the server doesn't grab
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// the keyboard when the mouse leaves the server screen. this
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// makes it possible to use the debugger (via the keyboard) when
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// all user input would normally be caught by the hook procedures.
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//
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#define NO_GRAB_KEYBOARD 0
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//
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// extra mouse wheel stuff
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//
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enum EWheelSupport {
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kWheelNone,
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kWheelOld,
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kWheelWin2000,
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kWheelModern
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};
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// declare extended mouse hook struct. useable on win2k
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typedef struct tagMOUSEHOOKSTRUCTWin2000 {
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MOUSEHOOKSTRUCT mhs;
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DWORD mouseData;
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} MOUSEHOOKSTRUCTWin2000;
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#if !defined(SM_MOUSEWHEELPRESENT)
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#define SM_MOUSEWHEELPRESENT 75
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#endif
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// X button stuff
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#if !defined(WM_XBUTTONDOWN)
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#define WM_XBUTTONDOWN 0x020B
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#define WM_XBUTTONUP 0x020C
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#define WM_XBUTTONDBLCLK 0x020D
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#define WM_NCXBUTTONDOWN 0x00AB
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#define WM_NCXBUTTONUP 0x00AC
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#define WM_NCXBUTTONDBLCLK 0x00AD
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#define MOUSEEVENTF_XDOWN 0x0100
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#define MOUSEEVENTF_XUP 0x0200
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#define XBUTTON1 0x0001
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#define XBUTTON2 0x0002
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#endif
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//
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// globals
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//
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#pragma comment(linker, "-section:shared,rws")
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#pragma data_seg("shared")
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// all data in this shared section *must* be initialized
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static HINSTANCE g_hinstance = NULL;
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static DWORD g_processID = 0;
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static EWheelSupport g_wheelSupport = kWheelNone;
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static UINT g_wmMouseWheel = 0;
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static DWORD g_threadID = 0;
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static HHOOK g_keyboard = NULL;
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static HHOOK g_mouse = NULL;
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static HHOOK g_getMessage = NULL;
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static HANDLE g_hookThreadLL = NULL;
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static DWORD g_hookThreadIDLL = 0;
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static HANDLE g_hookEventLL = NULL;
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static HHOOK g_keyboardLL = NULL;
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static HHOOK g_mouseLL = NULL;
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static bool g_screenSaver = false;
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static bool g_relay = false;
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static UInt32 g_zoneSides = 0;
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static SInt32 g_zoneSize = 0;
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static SInt32 g_xScreen = 0;
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static SInt32 g_yScreen = 0;
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static SInt32 g_wScreen = 0;
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static SInt32 g_hScreen = 0;
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static HCURSOR g_cursor = NULL;
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static DWORD g_cursorThread = 0;
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#pragma data_seg()
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// keep linker quiet about floating point stuff. we don't use any
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// floating point operations but our includes may define some
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// (unused) floating point values.
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#ifndef _DEBUG
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extern "C" int _fltused=0;
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#endif
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//
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// internal functions
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//
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static
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void
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hideCursor(DWORD thread)
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{
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// we should be running the context of the window who's cursor
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// we want to hide so we shouldn't have to attach thread input
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// but we'll check to make sure.
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g_cursorThread = thread;
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if (g_cursorThread != 0) {
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DWORD myThread = GetCurrentThreadId();
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if (myThread != g_cursorThread)
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AttachThreadInput(myThread, g_cursorThread, TRUE);
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g_cursor = SetCursor(NULL);
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if (myThread != g_cursorThread)
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AttachThreadInput(myThread, g_cursorThread, FALSE);
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}
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}
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static
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void
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restoreCursor()
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{
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// restore the show cursor in the window we hid it last
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if (g_cursor != NULL && g_cursorThread != 0) {
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DWORD myThread = GetCurrentThreadId();
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if (myThread != g_cursorThread)
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AttachThreadInput(myThread, g_cursorThread, TRUE);
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SetCursor(g_cursor);
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if (myThread != g_cursorThread)
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AttachThreadInput(myThread, g_cursorThread, FALSE);
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}
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g_cursor = NULL;
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g_cursorThread = 0;
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}
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static
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bool
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keyboardHookHandler(WPARAM wParam, LPARAM lParam)
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{
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// forward message to our window. do this whether or not we're
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// forwarding events to clients because this'll keep our thread's
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// key state table up to date. that's important for querying
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// the scroll lock toggle state.
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PostThreadMessage(g_threadID, SYNERGY_MSG_KEY, wParam, lParam);
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if (g_relay) {
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// let certain keys pass through
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switch (wParam) {
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case VK_CAPITAL:
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case VK_NUMLOCK:
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case VK_SCROLL:
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// pass event on. we want to let these through to
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// the window proc because otherwise the keyboard
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// lights may not stay synchronized.
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break;
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default:
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// discard event
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return true;
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}
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}
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return false;
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}
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static
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bool
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mouseHookHandler(WPARAM wParam, SInt32 x, SInt32 y, SInt32 data)
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{
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switch (wParam) {
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case WM_LBUTTONDOWN:
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case WM_MBUTTONDOWN:
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case WM_RBUTTONDOWN:
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case WM_XBUTTONDOWN:
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case WM_LBUTTONDBLCLK:
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case WM_MBUTTONDBLCLK:
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case WM_RBUTTONDBLCLK:
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case WM_XBUTTONDBLCLK:
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case WM_LBUTTONUP:
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case WM_MBUTTONUP:
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case WM_RBUTTONUP:
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case WM_XBUTTONUP:
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case WM_NCLBUTTONDOWN:
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case WM_NCMBUTTONDOWN:
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case WM_NCRBUTTONDOWN:
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case WM_NCXBUTTONDOWN:
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case WM_NCLBUTTONDBLCLK:
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case WM_NCMBUTTONDBLCLK:
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case WM_NCRBUTTONDBLCLK:
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case WM_NCXBUTTONDBLCLK:
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case WM_NCLBUTTONUP:
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case WM_NCMBUTTONUP:
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case WM_NCRBUTTONUP:
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case WM_NCXBUTTONUP:
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// always relay the event. eat it if relaying.
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_BUTTON, wParam, data);
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return g_relay;
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case WM_MOUSEWHEEL:
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if (g_relay) {
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// relay event
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_WHEEL, data, 0);
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}
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return g_relay;
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case WM_NCMOUSEMOVE:
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case WM_MOUSEMOVE:
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if (g_relay) {
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// we want the cursor to be hidden at all times so we
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// hide the cursor on whatever window has it. but then
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// we have to show the cursor whenever we leave that
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// window (or at some later time before we stop relaying).
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// so check the window with the cursor. if it's not the
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// same window that had it before then show the cursor
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// in the last window and hide it in this window.
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DWORD thread = GetCurrentThreadId();
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if (thread != g_cursorThread) {
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restoreCursor();
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hideCursor(thread);
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}
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// relay and eat event
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
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return true;
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}
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else {
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// check for mouse inside jump zone
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bool inside = false;
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if (!inside && (g_zoneSides & kLeftMask) != 0) {
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inside = (x < g_xScreen + g_zoneSize);
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}
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if (!inside && (g_zoneSides & kRightMask) != 0) {
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inside = (x >= g_xScreen + g_wScreen - g_zoneSize);
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}
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if (!inside && (g_zoneSides & kTopMask) != 0) {
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inside = (y < g_yScreen + g_zoneSize);
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}
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if (!inside && (g_zoneSides & kBottomMask) != 0) {
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inside = (y >= g_yScreen + g_hScreen - g_zoneSize);
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}
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// relay the event
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
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// if inside then eat the event
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return inside;
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}
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}
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// pass the event
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return false;
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}
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static
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LRESULT CALLBACK
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keyboardHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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// handle the message
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if (keyboardHookHandler(wParam, lParam)) {
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return 1;
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}
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}
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return CallNextHookEx(g_keyboard, code, wParam, lParam);
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}
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static
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LRESULT CALLBACK
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mouseHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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// decode message
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const MOUSEHOOKSTRUCT* info = (const MOUSEHOOKSTRUCT*)lParam;
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SInt32 x = (SInt32)info->pt.x;
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SInt32 y = (SInt32)info->pt.y;
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SInt32 w = 0;
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if (wParam == WM_MOUSEWHEEL) {
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// win2k and other systems supporting WM_MOUSEWHEEL in
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// the mouse hook are gratuitously different (and poorly
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// documented). if a low-level mouse hook is in place
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// it should capture these events so we'll never see
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// them.
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switch (g_wheelSupport) {
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case kWheelModern:
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w = static_cast<SInt32>(LOWORD(info->dwExtraInfo));
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break;
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case kWheelWin2000: {
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const MOUSEHOOKSTRUCTWin2000* info2k =
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(const MOUSEHOOKSTRUCTWin2000*)lParam;
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w = static_cast<SInt32>(HIWORD(info2k->mouseData));
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break;
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}
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}
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}
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// handle the message. note that we don't handle X buttons
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// here. that's okay because they're only supported on
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// win2k and winxp and up and on those platforms we'll get
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// get the mouse events through the low level hook.
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if (mouseHookHandler(wParam, x, y, w)) {
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return 1;
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}
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}
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return CallNextHookEx(g_mouse, code, wParam, lParam);
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}
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static
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LRESULT CALLBACK
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getMessageHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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if (g_screenSaver) {
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MSG* msg = reinterpret_cast<MSG*>(lParam);
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if (msg->message == WM_SYSCOMMAND &&
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msg->wParam == SC_SCREENSAVE) {
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// broadcast screen saver started message
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PostThreadMessage(g_threadID,
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SYNERGY_MSG_SCREEN_SAVER, TRUE, 0);
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}
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}
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if (g_relay) {
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MSG* msg = reinterpret_cast<MSG*>(lParam);
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if (msg->message == g_wmMouseWheel) {
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// post message to our window
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PostThreadMessage(g_threadID,
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SYNERGY_MSG_MOUSE_WHEEL, msg->wParam, 0);
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// zero out the delta in the message so it's (hopefully)
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// ignored
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msg->wParam = 0;
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}
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}
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}
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return CallNextHookEx(g_getMessage, code, wParam, lParam);
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}
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#if (_WIN32_WINNT >= 0x0400)
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//
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// low-level keyboard hook -- this allows us to capture and handle
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// alt+tab, alt+esc, ctrl+esc, and windows key hot keys. on the down
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// side, key repeats are not reported to us.
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//
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static
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LRESULT CALLBACK
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keyboardLLHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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// decode the message
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KBDLLHOOKSTRUCT* info = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
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WPARAM wParam = info->vkCode;
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LPARAM lParam = 1; // repeat code
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lParam |= (info->scanCode << 16); // scan code
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if (info->flags & LLKHF_EXTENDED) {
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lParam |= (1lu << 24); // extended key
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}
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if (info->flags & LLKHF_ALTDOWN) {
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lParam |= (1lu << 29); // context code
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}
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if (info->flags & LLKHF_UP) {
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lParam |= (1lu << 31); // transition
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}
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// FIXME -- bit 30 should be set if key was already down but
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// we don't know that info. as a result we'll never generate
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// key repeat events.
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// handle the message
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if (keyboardHookHandler(wParam, lParam)) {
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return 1;
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}
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}
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return CallNextHookEx(g_keyboardLL, code, wParam, lParam);
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}
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//
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// low-level mouse hook -- this allows us to capture and handle mouse
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// events very early. the earlier the better.
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//
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static
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LRESULT CALLBACK
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mouseLLHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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// decode the message
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MSLLHOOKSTRUCT* info = reinterpret_cast<MSLLHOOKSTRUCT*>(lParam);
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SInt32 x = (SInt32)info->pt.x;
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SInt32 y = (SInt32)info->pt.y;
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SInt32 w = (SInt32)HIWORD(info->mouseData);
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// handle the message
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if (mouseHookHandler(wParam, x, y, w)) {
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return 1;
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}
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}
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return CallNextHookEx(g_mouseLL, code, wParam, lParam);
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}
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static
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DWORD WINAPI
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getLowLevelProc(void*)
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{
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// thread proc for low-level keyboard/mouse hooks. this does
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// nothing but install the hook, process events, and uninstall
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// the hook.
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// force this thread to have a message queue
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MSG msg;
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PeekMessage(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
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#if !NO_GRAB_KEYBOARD
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// install low-level keyboard hook
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g_keyboardLL = SetWindowsHookEx(WH_KEYBOARD_LL,
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&keyboardLLHook,
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g_hinstance,
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0);
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if (g_keyboardLL == NULL) {
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// indicate failure and exit
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g_hookThreadIDLL = 0;
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SetEvent(g_hookEventLL);
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return 1;
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}
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#else
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// keep compiler quiet
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&keyboardLLHook;
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#endif
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// install low-level mouse hook
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g_mouseLL = SetWindowsHookEx(WH_MOUSE_LL,
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&mouseLLHook,
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g_hinstance,
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0);
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if (g_mouseLL == NULL) {
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// indicate failure and exit
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if (g_keyboardLL != NULL) {
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UnhookWindowsHookEx(g_keyboardLL);
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g_keyboardLL = NULL;
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}
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g_hookThreadIDLL = 0;
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SetEvent(g_hookEventLL);
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return 1;
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}
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// ready
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SetEvent(g_hookEventLL);
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// message loop
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bool done = false;
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while (!done) {
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switch (GetMessage(&msg, NULL, 0, 0)) {
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case -1:
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break;
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case 0:
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done = true;
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break;
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default:
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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break;
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}
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}
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// uninstall hook
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UnhookWindowsHookEx(g_mouseLL);
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UnhookWindowsHookEx(g_keyboardLL);
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g_mouseLL = NULL;
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g_keyboardLL = NULL;
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return 0;
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}
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#else // (_WIN32_WINNT < 0x0400)
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static
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DWORD WINAPI
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getLowLevelProc(void*)
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{
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g_hookThreadIDLL = 0;
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SetEvent(g_hookEventLL);
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return 1;
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}
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#endif
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static
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EWheelSupport
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getWheelSupport()
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{
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// get operating system
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OSVERSIONINFO info;
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info.dwOSVersionInfoSize = sizeof(info);
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if (!GetVersionEx(&info)) {
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return kWheelNone;
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}
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// see if modern wheel is present
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if (GetSystemMetrics(SM_MOUSEWHEELPRESENT)) {
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// note if running on win2k
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if (info.dwPlatformId == VER_PLATFORM_WIN32_NT &&
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info.dwMajorVersion == 5 &&
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info.dwMinorVersion == 0) {
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return kWheelWin2000;
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}
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return kWheelModern;
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}
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// not modern. see if we've got old-style support.
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UINT wheelSupportMsg = RegisterWindowMessage(MSH_WHEELSUPPORT);
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HWND wheelSupportWindow = FindWindow(MSH_WHEELMODULE_CLASS,
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MSH_WHEELMODULE_TITLE);
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if (wheelSupportWindow != NULL && wheelSupportMsg != 0) {
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if (SendMessage(wheelSupportWindow, wheelSupportMsg, 0, 0) != 0) {
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g_wmMouseWheel = RegisterWindowMessage(MSH_MOUSEWHEEL);
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if (g_wmMouseWheel != 0) {
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return kWheelOld;
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}
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}
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}
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// assume modern. we don't do anything special in this case
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// except respond to WM_MOUSEWHEEL messages. GetSystemMetrics()
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// can apparently return FALSE even if a mouse wheel is present
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// though i'm not sure exactly when it does that (WinME returns
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// FALSE for my logitech USB trackball).
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return kWheelModern;
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}
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//
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// external functions
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//
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BOOL WINAPI
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DllMain(HINSTANCE instance, DWORD reason, LPVOID)
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{
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if (reason == DLL_PROCESS_ATTACH) {
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DisableThreadLibraryCalls(instance);
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if (g_processID == 0) {
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g_hinstance = instance;
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g_processID = GetCurrentProcessId();
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}
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}
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else if (reason == DLL_PROCESS_DETACH) {
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if (g_processID == GetCurrentProcessId()) {
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if (g_keyboard != NULL ||
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g_mouse != NULL ||
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g_getMessage != NULL) {
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uninstall();
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uninstallScreenSaver();
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}
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g_processID = 0;
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g_hinstance = NULL;
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}
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}
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return TRUE;
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}
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extern "C" {
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int
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init(DWORD threadID)
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{
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assert(g_hinstance != NULL);
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// try to open process that last called init() to see if it's
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// still running or if it died without cleaning up.
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if (g_processID != 0 && g_processID != GetCurrentProcessId()) {
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HANDLE process = OpenProcess(STANDARD_RIGHTS_REQUIRED,
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FALSE, g_processID);
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if (process != NULL) {
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// old process (probably) still exists so refuse to
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// reinitialize this DLL (and thus steal it from the
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// old process).
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CloseHandle(process);
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return 0;
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}
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// clean up after old process. the system should've already
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// removed the hooks so we just need to reset our state.
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g_hinstance = GetModuleHandle("synrgyhk");
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g_processID = GetCurrentProcessId();
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g_wheelSupport = kWheelNone;
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g_threadID = 0;
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g_keyboard = NULL;
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g_mouse = NULL;
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g_getMessage = NULL;
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g_hookThreadLL = NULL;
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g_hookThreadIDLL = 0;
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g_hookEventLL = NULL;
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g_keyboardLL = NULL;
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g_mouseLL = NULL;
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g_screenSaver = false;
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}
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// save thread id. we'll post messages to this thread's
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// message queue.
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g_threadID = threadID;
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// set defaults
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g_relay = false;
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g_zoneSides = 0;
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g_zoneSize = 0;
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g_xScreen = 0;
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g_yScreen = 0;
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g_wScreen = 0;
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g_hScreen = 0;
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g_cursor = NULL;
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g_cursorThread = 0;
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return 1;
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}
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int
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cleanup(void)
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{
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assert(g_hinstance != NULL);
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if (g_processID == GetCurrentProcessId()) {
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g_threadID = 0;
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}
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return 1;
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}
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EHookResult
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install()
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{
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assert(g_hinstance != NULL);
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assert(g_keyboard == NULL);
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assert(g_mouse == NULL);
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assert(g_getMessage == NULL || g_screenSaver);
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// must be initialized
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if (g_threadID == 0) {
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return kHOOK_FAILED;
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}
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// check for mouse wheel support
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g_wheelSupport = getWheelSupport();
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// install GetMessage hook (unless already installed)
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if (g_wheelSupport == kWheelOld && g_getMessage == NULL) {
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g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
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&getMessageHook,
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g_hinstance,
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0);
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}
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// install low-level keyboard/mouse hooks, if possible. since these
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// hooks are called in the context of the installing thread and that
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// thread must have a message loop but we don't want the caller's
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// message loop to do the work, we'll fire up a separate thread
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// just for the hooks. note that low-level hooks are only available
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// on windows NT SP3 and above.
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g_hookEventLL = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (g_hookEventLL != NULL) {
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g_hookThreadLL = CreateThread(NULL, 0, &getLowLevelProc, 0,
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CREATE_SUSPENDED, &g_hookThreadIDLL);
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if (g_hookThreadLL != NULL) {
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// start the thread and wait for it to initialize
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ResumeThread(g_hookThreadLL);
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WaitForSingleObject(g_hookEventLL, INFINITE);
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ResetEvent(g_hookEventLL);
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// the thread clears g_hookThreadIDLL if it failed
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if (g_hookThreadIDLL == 0) {
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CloseHandle(g_hookThreadLL);
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g_hookThreadLL = NULL;
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}
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}
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if (g_hookThreadLL == NULL) {
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CloseHandle(g_hookEventLL);
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g_hookEventLL = NULL;
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}
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}
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// install non-low-level hooks if the low-level hooks are not installed
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if (g_hookThreadLL == NULL) {
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#if !NO_GRAB_KEYBOARD
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g_keyboard = SetWindowsHookEx(WH_KEYBOARD,
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&keyboardHook,
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g_hinstance,
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0);
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#else
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// keep compiler quiet
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&keyboardHook;
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#endif
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g_mouse = SetWindowsHookEx(WH_MOUSE,
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&mouseHook,
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g_hinstance,
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0);
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}
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// check for any failures. uninstall all hooks on failure.
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if (g_hookThreadLL == NULL &&
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#if !NO_GRAB_KEYBOARD
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(g_keyboard == NULL || g_mouse == NULL)) {
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#else
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(g_mouse == NULL)) {
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#endif
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if (g_keyboard != NULL) {
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UnhookWindowsHookEx(g_keyboard);
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g_keyboard = NULL;
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}
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if (g_mouse != NULL) {
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UnhookWindowsHookEx(g_mouse);
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g_mouse = NULL;
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}
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if (g_getMessage != NULL && !g_screenSaver) {
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UnhookWindowsHookEx(g_getMessage);
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g_getMessage = NULL;
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}
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g_threadID = NULL;
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return kHOOK_FAILED;
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}
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return (g_hookThreadLL == NULL) ? kHOOK_OKAY : kHOOK_OKAY_LL;
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}
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int
|
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uninstall(void)
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{
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assert(g_hinstance != NULL);
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// uninstall hooks
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if (g_hookThreadLL != NULL) {
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PostThreadMessage(g_hookThreadIDLL, WM_QUIT, 0, 0);
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WaitForSingleObject(g_hookThreadLL, INFINITE);
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CloseHandle(g_hookEventLL);
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CloseHandle(g_hookThreadLL);
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g_hookEventLL = NULL;
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g_hookThreadLL = NULL;
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g_hookThreadIDLL = 0;
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}
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if (g_keyboard != NULL) {
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UnhookWindowsHookEx(g_keyboard);
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g_keyboard = NULL;
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}
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if (g_mouse != NULL) {
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UnhookWindowsHookEx(g_mouse);
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g_mouse = NULL;
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}
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if (g_getMessage != NULL && !g_screenSaver) {
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UnhookWindowsHookEx(g_getMessage);
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g_getMessage = NULL;
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}
|
|
g_wheelSupport = kWheelNone;
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|
|
// show the cursor
|
|
restoreCursor();
|
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|
|
return 1;
|
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}
|
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|
|
int
|
|
installScreenSaver(void)
|
|
{
|
|
assert(g_hinstance != NULL);
|
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|
|
// must be initialized
|
|
if (g_threadID == 0) {
|
|
return 0;
|
|
}
|
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|
|
// generate screen saver messages
|
|
g_screenSaver = true;
|
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|
|
// install hook unless it's already installed
|
|
if (g_getMessage == NULL) {
|
|
g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
|
|
&getMessageHook,
|
|
g_hinstance,
|
|
0);
|
|
}
|
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|
|
return (g_getMessage != NULL) ? 1 : 0;
|
|
}
|
|
|
|
int
|
|
uninstallScreenSaver(void)
|
|
{
|
|
assert(g_hinstance != NULL);
|
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|
|
// 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;
|
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|
|
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
|
|
setRelay(int enable)
|
|
{
|
|
if ((enable != 0) == g_relay) {
|
|
// no change
|
|
return;
|
|
}
|
|
g_relay = (enable != 0);
|
|
if (!g_relay) {
|
|
restoreCursor();
|
|
}
|
|
}
|
|
|
|
}
|