better rule contains

src/iptables_wrapper.rs

@@ -8,7 +8,7 @@ pub fn is_port_secured(port: u16, docker: bool) -> bool {
     }
 
     for rule in rules.unwrap() {
-        if rule.contains(&format!("-p tcp --dport {} -j DROP", port)) {
+        if rule.contains(&format!("-p tcp -m tcp --dport {} -j DROP", port)) {
             return true;
         }
     }