util

func ContainsPort ¶

func ContainsPort(portRanges [][2]int64, port int64) bool

func GetAuthKey ¶

func GetAuthKey(token string, timestamp int64) (key string)

func GetPortRanges ¶

func GetPortRanges(rangeStr string) (portRanges [][2]int64, err error)

for example: rangeStr is "1000-2000,2001,2002,3000-4000", return an array as port ranges.

func IsPortValid ¶

func IsPortValid(port int) bool

func IsTCPPortAvailable ¶

func IsTCPPortAvailable(port int) bool

IsTCPPortAvailable returns a flag indicating whether or not a TCP port is available.

func PortRangesCut ¶

func PortRangesCut(portRanges [][2]int64, port int64) [][2]int64

func RandId ¶

func RandId() (id string, err error)

RandId return a rand string used in frp.

func RandIdWithLen ¶

func RandIdWithLen(idLen int) (id string, err error)

RandIdWithLen return a rand string with idLen length.

func RandomTCPPort ¶

func RandomTCPPort() int

RandomTCPPort gets a free, random TCP port between 1025-65535. If no free ports are available -1 is returned.