支持排除tun

vnt/src/handle/tun_tap/mod.rs

@@ -1,11 +1,45 @@
-mod channel_group;
 pub mod tun_handler;
 
 #[cfg(unix)]
 mod unix;
+
+use crossbeam_utils::atomic::AtomicCell;
+use parking_lot::Mutex;
+use std::sync::Arc;
 #[cfg(unix)]
 pub(crate) use unix::*;
+
 #[cfg(target_os = "windows")]
 mod windows;
+
 #[cfg(target_os = "windows")]
 pub(crate) use windows::*;
+
+/// 仅仅是停止tun，不停止vnt
+#[derive(Clone, Default)]
+pub struct DeviceStop {
+    f: Arc<Mutex<Option<Box<dyn FnOnce() -> bool + Send>>>>,
+    stopped: Arc<AtomicCell<bool>>,
+}
+
+impl DeviceStop {
+    pub fn set_stop_fn<F>(&self, f: F)
+    where
+        F: FnOnce() -> bool + Send + 'static,
+    {
+        self.f.lock().replace(Box::new(f));
+    }
+    pub fn stop(&self) -> bool {
+        if let Some(f) = self.f.lock().take() {
+            f()
+        } else {
+            false
+        }
+    }
+    pub fn stopped(&self) {
+        self.stopped.store(true);
+    }
+    pub fn is_stop(&self) -> bool {
+        self.stopped.load()
+    }
+}