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/proto/cli.proto

@@ -1,6 +1,7 @@
 syntax = "proto3";
 
 import "common.proto";
+import "peer_rpc.proto";
 
 package cli;
 
@@ -34,6 +35,8 @@ message PeerConnInfo {
 message PeerInfo {
   uint32 peer_id = 1;
   repeated PeerConnInfo conns = 2;
+  common.UUID default_conn_id = 3;
+  repeated common.UUID directly_connected_conns = 4;
 }
 
 message ListPeerRequest {}
@@ -79,6 +82,7 @@ message NodeInfo {
   string config = 8;
   string version = 9;
   common.PeerFeatureFlag feature_flag = 10;
+  peer_rpc.GetIpListResponse ip_list = 11;
 }
 
 message ShowNodeInfoRequest {}

easytier/src/proto/cli.rs

@@ -4,10 +4,14 @@ impl PeerRoutePair {
     pub fn get_latency_ms(&self) -> Option<f64> {
         let mut ret = u64::MAX;
         let p = self.peer.as_ref()?;
+        let default_conn_id = p.default_conn_id.map(|id| id.to_string());
         for conn in p.conns.iter() {
             let Some(stats) = &conn.stats else {
                 continue;
             };
+            if default_conn_id == Some(conn.conn_id.to_string()) {
+                return Some(f64::from(stats.latency_us as u32) / 1000.0);
+            }
             ret = ret.min(stats.latency_us);
         }
 

easytier/src/proto/common.proto

@@ -18,7 +18,7 @@ message FlagsInConfig {
   bool disable_p2p = 11;
   bool relay_all_peer_rpc = 12;
   bool disable_udp_hole_punching = 13;
-  string ipv6_listener = 14;
+  // string ipv6_listener = 14; [deprecated = true]; use -l udp://[::]:12345 instead
   bool multi_thread = 15;
   CompressionAlgoPb data_compress_algo = 16;
   bool bind_device = 17;