implemented an echo server

src/configuration.rs

@@ -40,7 +40,7 @@ impl Settings {
 
             Settings {
                 foreground: matches.is_present("FOREGROUND"),
-                listen: matches.value_of("LISTEN").unwrap_or("default").to_owned(),
+                listen: matches.value_of("LISTEN").unwrap_or("127.0.0.1").to_owned(),
                 plugins: matches.value_of("PLUGIN").unwrap_or("filesystem").split(",").map(|s| s.to_string()).collect(),
                 port: FromStr::from_str(matches.value_of("PORT").unwrap_or("70")).unwrap()
             }

src/main.rs

@@ -21,9 +21,9 @@ fn main() {
     println!("Loading plugins {:?}", settings.plugins);
     println!("Listening on port {}", settings.port);
 
-    let addr = format!("{}:{}", settings.listen, settings.port)
-        .parse::<SocketAddr>()
-        .unwrap();
+    let addr: SocketAddr = format!("{}:{}", settings.listen, settings.port)
+        .parse()
+        .expect("Unable to parse socket addr");
 
     let listener = TcpListener::bind(&addr).unwrap();
     let server = listener