c.TLS = Plaintext
	}
	if c.Address == "" {
		// pick a random address, assumption is the test does not care
		c.Address = "1.3.3.7"
	}
	if c.TLS == MTLS && c.Alpn == "" {
		c.Alpn = protocolToMTLSAlpn(c.Protocol)
	}
	if c.TLS == TLS && c.Alpn == "" {
		c.Alpn = protocolToTLSAlpn(c.Protocol)
	}
	return c
}

type Result struct {
	Error              error
	ListenerMatched    string