tcp

Documentation

Overview

Provides encoding and decoding for TCP packets.

Index

• Constants
• type Flags
  • func (f Flags) String() string
• type OptType
• type Option
• type Packet
  • func Make() *Packet
  • func (p *Packet) Answers(other packet.Packet) bool
  • func (p *Packet) Equals(other packet.Packet) bool
  • func (p *Packet) GetLength() uint16
  • func (p *Packet) GetType() packet.Type
  • func (p *Packet) GuessPayloadType() packet.Type
  • func (p *Packet) InitChecksum(csum uint32)
  • func (p *Packet) Pack(buf *packet.Buffer) error
  • func (p *Packet) Payload() packet.Packet
  • func (p *Packet) SetPayload(pl packet.Packet) error
  • func (p *Packet) String() string
  • func (p *Packet) Unpack(buf *packet.Buffer) error

Constants

const (
	Syn Flags = 1 << 1
	Fin       = 1 << 2
	Rst       = 1 << 3
	PSH       = 1 << 4
	Ack       = 1 << 5
	Urg       = 1 << 6
	ECE       = 1 << 7
	Cwr       = 1 << 8
	NS        = 1 << 9
)

const (
	End         OptType = 0x00
	Nop                 = 0x01
	MSS                 = 0x02
	WindowScale         = 0x03
	SAckOk              = 0x04
	SAck                = 0x05
	Timestamp           = 0x08
)

Types

type Flags

type Flags uint16

func (Flags) String

func (f Flags) String() string

type OptType

type OptType uint8

type Option

type Option struct {
	Type OptType
	Len  uint8
	Data []byte
}

type Packet

type Packet struct {
	SrcPort    uint16 `string:"sport"`
	DstPort    uint16 `string:"dport"`
	Seq        uint32
	Ack        uint32
	DataOff    uint8 `string:"off"`
	Flags      Flags
	WindowSize uint16   `string:"win"`
	Checksum   uint16   `string:"sum"`
	Urgent     uint16   `string:"urg"`
	Options    []Option `cmp:"skip" string:"skip"`
	// contains filtered or unexported fields
}

func Make

func Make() *Packet

func (*Packet) Answers

func (p *Packet) Answers(other packet.Packet) bool

func (*Packet) Equals

func (p *Packet) Equals(other packet.Packet) bool

func (*Packet) GetLength

func (p *Packet) GetLength() uint16

func (*Packet) GetType

func (p *Packet) GetType() packet.Type

func (*Packet) GuessPayloadType

func (p *Packet) GuessPayloadType() packet.Type

func (*Packet) InitChecksum

func (p *Packet) InitChecksum(csum uint32)

func (*Packet) Pack

func (p *Packet) Pack(buf *packet.Buffer) error

func (*Packet) Payload

func (p *Packet) Payload() packet.Packet

func (*Packet) SetPayload

func (p *Packet) SetPayload(pl packet.Packet) error

func (*Packet) String

func (p *Packet) String() string

func (*Packet) Unpack

func (p *Packet) Unpack(buf *packet.Buffer) error