feat(daemon): Print warning when not elevated

src/apps/deskflow-daemon/deskflow-daemon.cpp

@@ -68,6 +68,13 @@ int main(int argc, char **argv)
     LOG_DEBUG("log level: %s", logLevel.c_str());
   }
 
+#if SYSAPI_WIN32
+  // Show warning if not running as admin as daemon will behave differently.
+  if (!ArchMiscWindows::isProcessElevated()) {
+    LOG_WARN("not running as admin, some features may not work");
+  }
+#endif
+
   switch (initResult) {
     using enum DaemonApp::InitResult;
 

src/lib/arch/win32/ArchMiscWindows.cpp

@@ -604,3 +604,29 @@ void ArchMiscWindows::guardRuntimeVersion() // NOSONAR - `noreturn` is not avail
     exit(1);
   }
 }
+
+bool ArchMiscWindows::isProcessElevated()
+{
+  LOG_DEBUG("checking if process is elevated");
+
+  HANDLE hToken = nullptr;
+  if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken)) {
+    throw XArch(new XArchEvalWindows());
+  }
+
+  TOKEN_ELEVATION elevation;
+
+  try {
+    DWORD dwSize = sizeof(TOKEN_ELEVATION);
+    if (!GetTokenInformation(hToken, TokenElevation, &elevation, sizeof(elevation), &dwSize)) {
+      throw XArch(new XArchEvalWindows());
+    }
+  } catch (...) {
+    CloseHandle(hToken);
+    throw;
+  }
+
+  const auto isElevated = elevation.TokenIsElevated;
+  LOG_DEBUG("process is %s", isElevated ? "elevated" : "not elevated");
+  return isElevated;
+}

src/lib/arch/win32/ArchMiscWindows.h

@@ -169,8 +169,12 @@ public:
   //! Saves the window instance for later use.
   static void setInstanceWin32(HINSTANCE instance);
 
+  //! Get the name of the active input desktop.
   static std::string getActiveDesktopName();
 
+  //! Returns true if the process is running with elevated privileges (i.e. as admin).
+  static bool isProcessElevated();
+
 private:
   //! Open and return a registry key, closing the parent key
   static HKEY openKey(HKEY parent, const TCHAR *child, bool create);