[mio] 优化代理

vnt/src/ip_proxy/icmp_proxy.rs

@@ -181,13 +181,12 @@ fn recv_handle(
                             log::warn!("加密失败:{}", e);
                             return;
                         }
-                        if context.send_by_id(net_packet.buffer(), &dest_ip).is_err() {
-                            let connect_server = current_device.connect_server;
-                            if let Err(e) =
-                                context.send_default(net_packet.buffer(), connect_server)
-                            {
-                                log::warn!("发送到目标失败:{},{}", e, connect_server);
-                            }
+                        if let Err(e) = context.send_ipv4_by_id(
+                            net_packet.buffer(),
+                            &dest_ip,
+                            current_device.connect_server,
+                        ) {
+                            log::warn!("发送到目标失败:{}", e);
                         }
                     }
                 }

vnt/src/ip_proxy/tcp_proxy.rs

@@ -300,6 +300,13 @@ fn tcp_connect(src_port: u16, addr: SocketAddr) -> io::Result<TcpStream> {
     {
         socket.bind(&SocketAddrV4::new(Ipv4Addr::UNSPECIFIED, 0).into())?;
     }
+    if let Err(e) = socket.set_tcp_keepalive(
+        &socket2::TcpKeepalive::new()
+            .with_time(Duration::from_secs(120))
+            .with_interval(Duration::from_secs(10)),
+    ) {
+        log::warn!("set_tcp_keepalive err {:?}", e);
+    }
     let _ = socket.set_nodelay(false);
     socket.connect_timeout(&addr.into(), Duration::from_secs(3))?;
     socket.set_nonblocking(true)?;