Add listenport

sshd.go

@@ -25,6 +25,7 @@ import (
 var (
 	authorisedKeys map[string]string
 
+	listenport     = flag.Int("listenport", 2200, "Port to listen on for incoming ssh connections")
 	hostkey        = flag.String("hostkey", "id_rsa", "Server host key to load")
 	authorisedkeys = flag.String("authorisedkeys", "authorized_keys", "Authorised keys")
 	verbose        = flag.Bool("verbose", false, "Enable verbose mode")
@@ -58,13 +59,13 @@ func main() {
 	config.AddHostKey(private)
 	loadAuthorisedKeys(*authorisedkeys)
 
-	listener, err := net.Listen("tcp", "0.0.0.0:2200")
+	listener, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", *listenport))
 	if err != nil {
-		log.Fatalf("Failed to listen on 2200 (%s)", err)
+		log.Fatalf("Failed to listen on %s (%s)", listenport, err)
 	}
 
 	// Accept all connections
-	log.Print("Listening on 2200...")
+	log.Printf("Listening on %d...", *listenport)
 	for {
 		tcpConn, err := listener.Accept()
 		if err != nil {