From 3dc807fc63c5115c0e61b80d78c26ef7f7036f61 Mon Sep 17 00:00:00 2001
From: Markus Unterwaditzer <markus-tarpit+git@unterwaditzer.net>
Date: Sat, 20 Sep 2025 19:49:01 +0200
Subject: [PATCH] Do not print instructions for admin UI when telnet is already
 running

---
 installer/src/tplink.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/installer/src/tplink.rs b/installer/src/tplink.rs
index faac84a..f4c5a37 100644
--- a/installer/src/tplink.rs
+++ b/installer/src/tplink.rs
@@ -295,6 +295,16 @@ async fn handler(state: State<AppState>, mut req: Request) -> Result<Response, S
 }
 
 async fn tplink_launch_telnet_v5(admin_ip: &str) -> Result<(), Error> {
+    let addr = SocketAddr::from_str(&format!("{admin_ip}:23")).unwrap();
+
+    if telnet_send_command(addr, "true", "exit code 0", true)
+        .await
+        .is_ok()
+    {
+        println!("telnet already appears to be running");
+        return Ok(());
+    }
+
     let client: HttpProxyClient =
         hyper_util::client::legacy::Client::<(), ()>::builder(TokioExecutor::new())
             .build(HttpConnector::new());
@@ -316,8 +326,6 @@ async fn tplink_launch_telnet_v5(admin_ip: &str) -> Result<(), Error> {
 
     let handle = tokio::spawn(async move { axum::serve(listener, app).await });
 
-    let addr = SocketAddr::from_str(&format!("{admin_ip}:23")).unwrap();
-
     while telnet_send_command(addr, "true", "exit code 0", true)
         .await
         .is_err()