Doubt

[Pedro F. Albanese]

Greetings!

Sorry, but which version of TLS is this? 1.1, 1.2?

	if *tcpip == "listen" {
		cert, err := gmtls.X509KeyPair(certpem, pripem)

		if err != nil {
			log.Fatal(err)
		}
		config := gmtls.Config{Certificates: []gmtls.Certificate{cert}, ClientAuth: gmtls.RequireAnyClientCert}
		config.Rand = rand.Reader

		port := "8081"
		if *public != "" {
			port = *public
		}

		ln, err := gmtls.Listen("tcp", ":"+port, &config)
		if err != nil {
			log.Fatal(err)
		}

		fmt.Fprintln(os.Stderr, "Server(TLS) up and listening on port "+port)

		conn, err := ln.Accept()
		if err != nil {
			log.Println(err)
		}
		defer ln.Close()

		fmt.Println("Connection accepted")

		for {
			message, err := bufio.NewReader(conn).ReadString('\n')
			if err != nil {
				fmt.Println(err)
				os.Exit(3)
			}
			fmt.Print("Received: ", string(message))

			newmessage := strings.ToUpper(message)
			conn.Write([]byte(newmessage + "\n"))
		}
	}
	
	if *tcpip == "dial" {
		cert, err := gmtls.X509KeyPair(certpem, pripem)

		if err != nil {
			log.Fatal(err)
		}

		ipport := "127.0.0.1:8081"
		if *public != "" {
			ipport = *public
		}

		config := gmtls.Config{Certificates: []gmtls.Certificate{cert}, InsecureSkipVerify: true}
		conn, err := gmtls.Dial("tcp", ipport, &config)
		if err != nil {
			log.Fatal(err)
		}
		certs := conn.ConnectionState().PeerCertificates
		for _, cert := range certs {
			fmt.Printf("Issuer Name: %s\n", cert.Issuer)
			fmt.Printf("Expiry: %s \n", cert.NotAfter.Format("Monday, 02-Jan-06 15:04:05 MST"))
			fmt.Printf("Common Name: %s \n", cert.Issuer.CommonName)
			fmt.Printf("IP Address: %s \n", cert.IPAddresses)
		}
		if err != nil {
			log.Fatal(err)
		}
		defer conn.Close()

		for {
			reader := bufio.NewReader(os.Stdin)
			fmt.Print("Text to be sent: ")
			text, err := reader.ReadString('\n')
			if err != nil {
				fmt.Println(err)
				os.Exit(3)
			}
			fmt.Fprintf(conn, text+"\n")

			message, err := bufio.NewReader(conn).ReadString('\n')
			if err != nil {
				fmt.Println(err)
				os.Exit(3)
			}
			fmt.Print("Server response: " + message)
		}
	}

Thanks in advance!