slightly more debugging

src/comm/comm.go

@@ -25,9 +25,11 @@ func NewConnection(address string, timelimit ...time.Duration) (c *Comm, err err
 	}
 	connection, err := net.DialTimeout("tcp", address, tlimit)
 	if err != nil {
+		err = fmt.Errorf("comm.NewConnection failed: %w", err)
 		return
 	}
 	c = New(connection)
+	log.Debugf("connected to '%s'", address)
 	return
 }
 

src/croc/croc.go

@@ -351,17 +351,18 @@ func (c *Client) Send(options TransferOptions) (err error) {
 		if port == "" {
 			port = "9009"
 		}
+		log.Debugf("got host '%v' and port '%v'", host, port)
 		c.Options.RelayAddress = net.JoinHostPort(host, port)
 		log.Debugf("establishing connection to %s", c.Options.RelayAddress)
 		var banner string
 		conn, banner, ipaddr, err := tcp.ConnectToTCPServer(c.Options.RelayAddress, c.Options.RelayPassword, c.Options.SharedSecret[:3], 5*time.Second)
-		log.Debugf("banner: %s", banner)
 		if err != nil {
 			err = fmt.Errorf("could not connect to %s: %w", c.Options.RelayAddress, err)
 			log.Debug(err)
 			errchan <- err
 			return
 		}
+		log.Debugf("banner: %s", banner)
 		log.Debugf("connection established: %+v", conn)
 		for {
 			log.Debug("waiting for bytes")

src/tcp/tcp.go

@@ -94,7 +94,7 @@ func (s *server) run() (err error) {
 	for {
 		connection, err := server.Accept()
 		if err != nil {
-			return fmt.Errorf( "problem accepting connection: %w", err)
+			return fmt.Errorf("problem accepting connection: %w", err)
 		}
 		log.Debugf("client %s connected", connection.RemoteAddr().String())
 		go func(port string, connection net.Conn) {