Add an example that instantly removes the port it added.

examples/add_remove.rs

@@ -0,0 +1,37 @@
+use std::net::SocketAddrV4;
+use std::env;
+
+extern crate igd;
+
+fn main() {
+    match igd::search_gateway() {
+        Err(ref err) => match *err {
+            igd::SearchError::IoError(ref ioe) => println!("IoError: {}", ioe),
+            _ => println!("{:?}", err),
+        },
+        Ok(gateway) => {
+            let args: Vec<_> = env::args().collect();
+            if args.len() != 4 {
+                println!("Usage: add_remove <local_ip> <local_port> <remote_port>");
+                return;
+            }
+            let local_ip = args[1].parse().expect("Invalid IP address");
+            let local_port = args[2].parse().expect("Invalid local port");
+            let remote_port = args[3].parse().expect("Invalid remote port");
+
+            let local_addr = SocketAddrV4::new(local_ip, local_port);
+
+            match gateway.add_port(igd::PortMappingProtocol::TCP, remote_port,
+                                local_addr, 60, "crust") {
+                Err(ref err) => println!("{:?}", err),
+                Ok(()) => {
+                    println!("AddPortMapping successful.");
+                    match gateway.remove_port(igd::PortMappingProtocol::TCP, remote_port) {
+                        Err(ref err) => println!("Error removing: {:?}", err),
+                        Ok(_) => println!("DeletePortMapping successful."),
+                    }
+                },
+            }
+        },
+    }
+}