tcp

Documentation

Index

• Constants
• func Checksum(data []byte, srcip, dstip string) uint16
• type Header
  • func NewHeader(b []byte) *Header
  • func (tcp *Header) HasFlag(flag byte) bool
  • func (tcp *Header) Marshal() []byte
• type Option

Constants

const (
	FIN = 1
	SYN = 2
	RST = 4
	PSH = 8
	ACK = 16
	URG = 32
)

Functions

func Checksum

func Checksum(data []byte, srcip, dstip string) uint16

Source: https://en.wikipedia.org/wiki/Transmission_Control_Protocol#Checksum_computation

Types

type Header

type Header struct {
	Source      uint16
	Destination uint16
	SeqNum      uint32
	AckNum      uint32
	DataOffset  uint8
	Reserved    uint8
	ECN         uint8
	Ctrl        uint8
	Window      uint16
	Checksum    uint16
	Urgent      uint16
	Options     []Option
}

func NewHeader

func NewHeader(b []byte) *Header

func (*Header) HasFlag

func (tcp *Header) HasFlag(flag byte) bool

func (*Header) Marshal

func (tcp *Header) Marshal() []byte

type Option

type Option struct {
	Kind   uint8
	Length uint8
	Data   []byte
}