feat: allow-only-conn-window-open https://github.com/rustdesk/rustdesk/discussions/7033

src/server/connection.rs

@@ -956,6 +956,13 @@ impl Connection {
         if !self.check_whitelist(&addr).await {
             return false;
         }
+        #[cfg(not(any(target_os = "android", target_os = "ios")))]
+        if crate::is_server() && Config::get_option("allow-only-conn-window-open") == "Y" {
+            if crate::check_process("", false) {
+                self.send_login_error("The main window is not open").await;
+                return false;
+            }
+        }
         self.ip = addr.ip().to_string();
         let mut msg_out = Message::new();
         msg_out.set_hash(self.hash.clone());