mirror of
https://github.com/debauchee/barrier.git
synced 2024-12-25 12:06:26 +03:00
cf71aec730
call cleanup(). if that process still appears to exist then the init() fails. otherwise some cleanup is performed and the init() proceeds. a synergy server started while another is running will now exit immediately without interfering the original server.
727 lines
16 KiB
C++
727 lines
16 KiB
C++
#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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// 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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//
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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_cbt = NULL;
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static HHOOK g_getMessage = NULL;
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static HANDLE g_keyHookThread = NULL;
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static DWORD g_keyHookThreadID = 0;
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static HANDLE g_keyHookEvent = NULL;
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static HHOOK g_keyboardLL = 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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//
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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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g_cursor = GetCursor();
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g_cursorThread = thread;
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SetCursor(NULL);
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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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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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if (g_relay) {
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// forward message to our window
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PostThreadMessage(g_threadID, SYNERGY_MSG_KEY, wParam, lParam);
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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 1;
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}
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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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if (g_relay) {
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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_LBUTTONUP:
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case WM_MBUTTONUP:
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case WM_RBUTTONUP:
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PostThreadMessage(g_threadID,
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SYNERGY_MSG_MOUSE_BUTTON, wParam, 0);
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return 1;
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case WM_MOUSEWHEEL:
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{
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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).
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switch (g_wheelSupport) {
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case kWheelModern: {
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const MOUSEHOOKSTRUCT* info =
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(const MOUSEHOOKSTRUCT*)lParam;
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_WHEEL,
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static_cast<short>(
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LOWORD(info->dwExtraInfo)), 0);
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break;
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}
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case kWheelWin2000: {
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const MOUSEHOOKSTRUCTWin2000* info =
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(const MOUSEHOOKSTRUCTWin2000*)lParam;
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_WHEEL,
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static_cast<short>(
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HIWORD(info->mouseData)), 0);
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break;
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}
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default:
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break;
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}
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}
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return 1;
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case WM_MOUSEMOVE:
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{
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const MOUSEHOOKSTRUCT* info =
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(const MOUSEHOOKSTRUCT*)lParam;
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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 = GetWindowThreadProcessId(info->hwnd, NULL);
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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 the motion
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SInt32 x = (SInt32)info->pt.x;
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SInt32 y = (SInt32)info->pt.y;
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
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}
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return 1;
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}
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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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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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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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// if inside then eat event and notify our window
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if (inside) {
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restoreCursor();
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PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_MOVE, x, y);
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return 1;
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}
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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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cbtHook(int code, WPARAM wParam, LPARAM lParam)
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{
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if (code >= 0) {
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if (g_relay) {
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// do nothing for now. may add something later.
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}
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}
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return CallNextHookEx(g_cbt, 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 && 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 compressed for 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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if (g_relay) {
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KBDLLHOOKSTRUCT* info = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
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// let certain keys pass through
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switch (info->vkCode) {
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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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// construct lParam for WM_KEYDOWN, etc.
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DWORD 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
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// forward message to our window
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PostThreadMessage(g_threadID,
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SYNERGY_MSG_KEY, info->vkCode, lParam);
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// discard event
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return 1;
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}
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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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static
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DWORD WINAPI
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getKeyboardLLProc(void*)
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{
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// thread proc for low-level keyboard hook. this does nothing but
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// install the hook, process events, and uninstall 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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// 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_keyHookThreadID = 0;
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SetEvent(g_keyHookEvent);
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return 1;
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}
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// ready
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SetEvent(g_keyHookEvent);
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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_keyboardLL);
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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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#error foo
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static
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DWORD WINAPI
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getKeyboardLLProc(void*)
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{
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g_keyHookThreadID = 0;
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SetEvent(g_keyHookEvent);
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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 || g_mouse != NULL || g_cbt != NULL) {
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uninstall();
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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_cbt = NULL;
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g_getMessage = NULL;
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g_keyHookThread = NULL;
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g_keyHookThreadID = 0;
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g_keyHookEvent = NULL;
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g_keyboardLL = 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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int
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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_cbt == 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 0;
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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 keyboard hook
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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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if (g_keyboard == NULL) {
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g_threadID = NULL;
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return 0;
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}
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// install mouse hook
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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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if (g_mouse == NULL) {
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// uninstall keyboard hook before failing
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UnhookWindowsHookEx(g_keyboard);
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|
g_keyboard = NULL;
|
|
g_threadID = NULL;
|
|
return 0;
|
|
}
|
|
|
|
// install CBT hook
|
|
g_cbt = SetWindowsHookEx(WH_CBT,
|
|
&cbtHook,
|
|
g_hinstance,
|
|
0);
|
|
if (g_cbt == NULL) {
|
|
// uninstall keyboard and mouse hooks before failing
|
|
UnhookWindowsHookEx(g_keyboard);
|
|
UnhookWindowsHookEx(g_mouse);
|
|
g_keyboard = NULL;
|
|
g_mouse = NULL;
|
|
g_threadID = NULL;
|
|
return 0;
|
|
}
|
|
|
|
// install GetMessage hook (unless already installed)
|
|
if (g_wheelSupport == kWheelOld && g_getMessage == NULL) {
|
|
g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
|
|
&getMessageHook,
|
|
g_hinstance,
|
|
0);
|
|
// ignore failure; we just won't get mouse wheel messages
|
|
}
|
|
|
|
// install low-level keyboard hook, if possible. since this hook
|
|
// is called in the context of the installing thread and that
|
|
// thread must have a message loop but we don't want the caller's
|
|
// message loop to do the work, we'll fire up a separate thread
|
|
// just for the hook. note that low-level keyboard hooks are only
|
|
// available on windows NT SP3 and above.
|
|
g_keyHookEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
|
|
if (g_keyHookEvent != NULL) {
|
|
g_keyHookThread = CreateThread(NULL, 0, &getKeyboardLLProc, 0,
|
|
CREATE_SUSPENDED, &g_keyHookThreadID);
|
|
if (g_keyHookThread != NULL) {
|
|
// start the thread and wait for it to initialize
|
|
ResumeThread(g_keyHookThread);
|
|
WaitForSingleObject(g_keyHookEvent, INFINITE);
|
|
ResetEvent(g_keyHookEvent);
|
|
|
|
// the thread clears g_keyHookThreadID if it failed
|
|
if (g_keyHookThreadID == 0) {
|
|
CloseHandle(g_keyHookThread);
|
|
g_keyHookThread = NULL;
|
|
}
|
|
}
|
|
if (g_keyHookThread == NULL) {
|
|
CloseHandle(g_keyHookEvent);
|
|
g_keyHookEvent = NULL;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
uninstall(void)
|
|
{
|
|
assert(g_hinstance != NULL);
|
|
|
|
// uninstall hooks
|
|
if (g_keyHookThread != NULL) {
|
|
PostThreadMessage(g_keyHookThreadID, WM_QUIT, 0, 0);
|
|
WaitForSingleObject(g_keyHookThread, INFINITE);
|
|
CloseHandle(g_keyHookEvent);
|
|
CloseHandle(g_keyHookThread);
|
|
g_keyHookEvent = NULL;
|
|
g_keyHookThread = NULL;
|
|
g_keyHookThreadID = 0;
|
|
}
|
|
if (g_keyboard != NULL) {
|
|
UnhookWindowsHookEx(g_keyboard);
|
|
}
|
|
if (g_mouse != NULL) {
|
|
UnhookWindowsHookEx(g_mouse);
|
|
}
|
|
if (g_cbt != NULL) {
|
|
UnhookWindowsHookEx(g_cbt);
|
|
}
|
|
if (g_getMessage != NULL && !g_screenSaver) {
|
|
UnhookWindowsHookEx(g_getMessage);
|
|
g_getMessage = NULL;
|
|
}
|
|
g_keyboard = NULL;
|
|
g_mouse = NULL;
|
|
g_cbt = 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 == kWheelNone) {
|
|
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
|
|
setRelay(int enable)
|
|
{
|
|
g_relay = (enable != 0);
|
|
if (!g_relay) {
|
|
restoreCursor();
|
|
}
|
|
}
|
|
|
|
}
|