// If we don't want a message to be processed by Qt, return true and set result to
// the value that the window procedure should return. Otherwise return false.
bool WinShutdownMonitor::nativeEventFilter(const QByteArray& eventType, void* pMessage, long* pnResult)
{
Q_UNUSED(eventType);
MSG* pMsg = static_cast<MSG*>(pMessage);
// Seed OpenSSL PRNG with Windows event data (e.g. mouse movements and other user interactions)
if (RAND_event(pMsg->message, pMsg->wParam, pMsg->lParam) == 0) {
// Warn only once as this is performance-critical
static bool warned = false;
if (!warned) {
LogPrint("%s: OpenSSL RAND_event() failed to seed OpenSSL PRNG with enough data.\n", __func__);
warned = true;
}
}
switch (pMsg->message) {
case WM_QUERYENDSESSION: {
// Initiate a client shutdown after receiving a WM_QUERYENDSESSION and block
// Windows session end until we have finished client shutdown.
StartShutdown();
*pnResult = FALSE;
return true;
}
case WM_ENDSESSION: {
*pnResult = FALSE;
return true;
}
}
return false;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
static int seeded = 0;
switch (iMsg)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
DrawText(hdc, "Seeding the PRNG. Please move the mouse!", -1,
&rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
if (RAND_event(iMsg, wParam, lParam) == 1 && seeded == 0)
{
seeded = 1;
if (RAND_write_file(filename) <= 0)
MessageBox(hwnd, "Couldn't write random file!",
"OpenSSL", MB_OK | MB_ICONERROR);
PostQuitMessage(0);
}
return DefWindowProc(hwnd, iMsg, wParam, lParam);
}
