Add a setting "disable_udp_hole_punch" to disable UDP hole punch function (#291)

It can solve #289 tentative.

Co-authored-by: 3rdnature <root@natureblog.net>

easytier/src/common/config.rs

@@ -178,6 +178,8 @@ pub struct Flags {
     pub disable_p2p: bool,
     #[derivative(Default(value = "false"))]
     pub relay_all_peer_rpc: bool,
+    #[derivative(Default(value = "false"))]
+    pub disable_udp_hole_punching: bool,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]

easytier/src/connector/udp_hole_punch.rs

@@ -605,6 +605,9 @@ impl UdpHolePunchConnector {
         if self.data.global_ctx.get_flags().disable_p2p {
             return Ok(());
         }
+        if self.data.global_ctx.get_flags().disable_udp_hole_punching {
+            return Ok(());
+        }
 
         self.run_as_client().await?;
         self.run_as_server().await?;

easytier/src/easytier-core.rs

@@ -266,6 +266,13 @@ struct Cli {
     )]
     disable_p2p: bool,
 
+    #[arg(
+        long,
+        help = t!("core_clap.disable_udp_hole_punching").to_string(),
+        default_value = "false"
+    )]
+    disable_udp_hole_punching: bool,
+
     #[arg(
         long,
         help = t!("core_clap.relay_all_peer_rpc").to_string(),