package udp import ( "v2ray.com/core/common" "v2ray.com/core/common/net" ) // PickPort returns an unused UDP port in the system. The port returned is highly likely to be unused, but not guaranteed. func PickPort() net.Port { conn, err := net.ListenUDP("udp4", &net.UDPAddr{ IP: net.LocalHostIP.IP(), Port: 0, }) common.Must(err) defer conn.Close() addr := conn.LocalAddr().(*net.UDPAddr) return net.Port(addr.Port) }