fix #435

Author: rustdesk

src/relay_server.rs

@@ -428,6 +428,7 @@ async fn make_pair_(stream: impl StreamTrait, addr: SocketAddr, key: &str, limit
         if let Ok(msg_in) = RendezvousMessage::parse_from_bytes(&bytes) {
             if let Some(rendezvous_message::Union::RequestRelay(rf)) = msg_in.union {
                 if !key.is_empty() && rf.licence_key != key {
+                    log::warn!("Relay authentication failed from {} - invalid key", addr);
                     return;
                 }
                 if !rf.uuid.is_empty() {

src/rendezvous_server.rs

@@ -680,6 +680,7 @@ impl RendezvousServer {
     ) -> ResultType<(RendezvousMessage, Option<SocketAddr>)> {
         let mut ph = ph;
         if !key.is_empty() && ph.licence_key != key {
+            log::warn!("Authentication failed from {} for peer {} - invalid key", addr, ph.id);
             let mut msg_out = RendezvousMessage::new();
             msg_out.set_punch_hole_response(PunchHoleResponse {
                 failure: punch_hole_response::Failure::LICENSE_MISMATCH.into(),