server

Documentation

Index

• func PacketServer(captureDevice string) error
• type Client
• type KnockSequence

Functions

func PacketServer

func PacketServer(captureDevice string) error

PacketServer is the main function when operating in server mode it sets up the pcap on the capture device and starts a goroutine to rotate the knock sequence

Types

type Client

type Client struct {
	Progress    int       // index of current progress in sequence.   Value of 1 means first port has been matched
	Sequence    [4]uint16 // stores the knock sequence the current client is attempting.  It's set and tracked here to prevent race conditions during a knock sequence being received and key rotations
	LastUpdated time.Time // The last time the client sent a correct packet in the sequence
}

Client is used to keep track of a client attempting to perform an authentic knock sequence

type KnockSequence

type KnockSequence struct {
	Used         bool      // If true, that means this knock sequence has already been used once.  It may still be within the valid time window, but it can't be used again
	PortSequence [4]uint16 // Each knock sequence is four ports long
}

KnockSequence is used keep track of an ordered knock sequence and whether it's been marked for use (to prevent replay attacks)