improve direct connector (#685)

* support ipv6 stun
* show interface and public ip in cli node info
* direct conn should keep trying unless already direct connected
* peer should use conn with smallest latency
* deprecate ipv6_listener, use -l instead

easytier/src/tunnel/common.rs

@@ -360,7 +360,13 @@ pub(crate) fn setup_sokcet2_ext(
 
     socket2_socket.set_nonblocking(true)?;
     socket2_socket.set_reuse_address(true)?;
-    socket2_socket.bind(&socket2::SockAddr::from(*bind_addr))?;
+    if let Err(e) = socket2_socket.bind(&socket2::SockAddr::from(*bind_addr)) {
+        if bind_addr.is_ipv4() {
+            return Err(e.into());
+        } else {
+            tracing::warn!(?e, "bind failed, do not return error for ipv6");
+        }
+    }
 
     // #[cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))]
     // socket2_socket.set_reuse_port(true)?;

easytier/src/tunnel/mod.rs

@@ -126,7 +126,7 @@ pub trait TunnelListener: Send {
 }
 
 #[async_trait]
-#[auto_impl::auto_impl(Box)]
+#[auto_impl::auto_impl(Box, &mut)]
 pub trait TunnelConnector: Send {
     async fn connect(&mut self) -> Result<Box<dyn Tunnel>, TunnelError>;
     fn remote_url(&self) -> url::Url;

easytier/src/tunnel/tcp.rs

@@ -150,9 +150,9 @@ impl TcpTunnelConnector {
         &mut self,
         addr: SocketAddr,
     ) -> Result<Box<dyn Tunnel>, super::TunnelError> {
-        tracing::info!(addr = ?self.addr, "connect tcp start");
+        tracing::info!(url = ?self.addr, ?addr, "connect tcp start, bind addrs: {:?}", self.bind_addrs);
         let stream = TcpStream::connect(addr).await?;
-        tracing::info!(addr = ?self.addr, "connect tcp succ");
+        tracing::info!(url = ?self.addr, ?addr, "connect tcp succ");
         return get_tunnel_with_tcp_stream(stream, self.addr.clone().into());
     }
 
@@ -190,7 +190,7 @@ impl super::TunnelConnector for TcpTunnelConnector {
     async fn connect(&mut self) -> Result<Box<dyn Tunnel>, super::TunnelError> {
         let addr =
             check_scheme_and_get_socket_addr_ext::<SocketAddr>(&self.addr, "tcp", self.ip_version)?;
-        if self.bind_addrs.is_empty() || addr.is_ipv6() {
+        if self.bind_addrs.is_empty() {
             self.connect_with_default_bind(addr).await
         } else {
             self.connect_with_custom_bind(addr).await

easytier/src/tunnel/udp.rs

@@ -141,12 +141,27 @@ async fn respond_stun_packet(
         .encode_into_bytes(resp_msg.clone())
         .map_err(|e| anyhow::anyhow!("stun encode error: {:?}", e))?;
 
-    socket
-        .send_to(&rsp_buf, addr.clone())
-        .await
-        .with_context(|| "send stun response error")?;
+    let change_req = req_msg
+        .get_attribute::<ChangeRequest>()
+        .map(|r| r.ip() || r.port())
+        .unwrap_or(false);
 
-    tracing::debug!(?addr, ?req_msg, "udp respond stun packet done");
+    if !change_req {
+        socket
+            .send_to(&rsp_buf, addr.clone())
+            .await
+            .with_context(|| "send stun response error")?;
+    } else {
+        // send from a new udp socket
+        let socket = if addr.is_ipv4() {
+            UdpSocket::bind("0.0.0.0:0").await?
+        } else {
+            UdpSocket::bind("[::]:0").await?
+        };
+        socket.send_to(&rsp_buf, addr.clone()).await?;
+    }
+
+    tracing::debug!(?addr, ?req_msg, ?change_req, "udp respond stun packet done");
     Ok(())
 }