修复macos上已知问题

vnt/src/handle/tun_tap/tun_handler.rs

@@ -83,11 +83,20 @@ pub fn start(
     mut up_counter: SingleU64Adder,
 ) -> io::Result<()> {
     let worker = {
+        #[cfg(target_os = "macos")]
+        let current_device = current_device.clone();
         let device = device.clone();
         stop_manager.add_listener("tun_device".into(), move || {
             if let Err(e) = device.shutdown() {
                 log::warn!("{:?}", e);
             }
+            #[cfg(target_os = "macos")]
+            {
+                let ip = current_device.load().virtual_ip;
+                if let Ok(udp) = std::net::UdpSocket::bind("0.0.0.0:0"){
+                    let _ = udp.send_to(b"stop",format!("{:?}:1234",ip));
+                }
+            }
         })?
     };
     if parallel > 1 {

vnt/tun/src/macos/device.rs

@@ -235,7 +235,7 @@ impl IFace for Device {
     }
 
     fn shutdown(&self) -> io::Result<()> {
-        self.enabled(false)
+        Ok(())
     }
 
     fn set_ip(&self, address: Ipv4Addr, mask: Ipv4Addr) -> io::Result<()> {
@@ -281,6 +281,11 @@ impl IFace for Device {
     }
 
     fn write(&self, buf: &[u8]) -> io::Result<usize> {
-        self.tun.write(buf)
+        let mut packet = Vec::<u8>::with_capacity(4 + buf.len());
+        packet.push(0);
+        packet.push(0);
+        packet.extend_from_slice(&(libc::PF_INET as u16).to_be_bytes());
+        packet.extend_from_slice(buf);
+        self.tun.write(&packet)
     }
 }