stunner

type Stunner struct {
	// Send sends a packet.
	// It will typically be a PacketConn.WriteTo method value.
	Send func([]byte, net.Addr) (int, error) // sends a packet

	// Endpoint is called whenever a STUN response is received.
	// The server is the STUN server that replied, endpoint is the ip:port
	// from the STUN response, and d is the duration that the STUN request
	// took on the wire (not including DNS lookup time.
	Endpoint func(server, endpoint string, d time.Duration)

	Servers []string // STUN servers to contact

	// DNSCache optionally specifies a DNSCache to use.
	// If nil, a DNS cache is not used.
	DNSCache *dnscache.Resolver

	// Logf optionally specifies a log function. If nil, logging is disabled.
	Logf func(format string, args ...interface{})

	// OnlyIPv6 controls whether IPv6 is exclusively used.
	// If false, only IPv4 is used. There is currently no mixed mode.
	OnlyIPv6 bool
	// contains filtered or unexported fields
}