ethertalk

package

v0.2.0 Latest Latest Go to latest Published: Feb 23, 2023 License: BSD-3-Clause Imports: 7 Imported by: 2

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Repository

github.com/sfiera/multitalk

Links

Open Source Insights

Documentation ¶

Overview ¶

Encodes and decodes EtherTalk (DDP/AARP-over-Ethernet) packets.

Index ¶

Constants
Variables
func Equal(a, b *Packet) bool
func Marshal(pak Packet) ([]byte, error)
func Unmarshal(data []byte, pak *Packet) error
type EthHeader
type LinkHeader
type Packet
- func AARP(src ethernet.Addr, payload aarp.Packet) (*Packet, error)
- func AppleTalk(src ethernet.Addr, payload ddp.ExtPacket) (*Packet, error)
type SNAPProto

Constants ¶

View Source

const (
	EthHeaderSize  = 13
	LinkHeaderSize = 3
	SNAPProtoSize  = 5
)

Variables ¶

View Source

var (
	SNAP           = LinkHeader{0xAA, 0xAA, 0x03}
	AppleTalkProto = SNAPProto{[3]byte{0x08, 0x00, 0x07}, 0x809B}
	AARPProto      = SNAPProto{[3]byte{0x00, 0x00, 0x00}, 0x80F3}

	AppleTalkBroadcast = ethernet.Addr{0x09, 0x00, 0x07, 0xff, 0xff, 0xff}
)

Functions ¶

func Equal ¶

func Equal(a, b *Packet) bool

Returns true if two packets are equal. Ignores padding.

func Marshal ¶

func Marshal(pak Packet) ([]byte, error)

Marshals a packet to bytes.

func Unmarshal ¶

func Unmarshal(data []byte, pak *Packet) error

Unmarshals a packet from bytes.

Types ¶

type EthHeader ¶

type EthHeader struct {
	Dst, Src ethernet.Addr
	Size     uint16
}

type LinkHeader ¶

type LinkHeader struct {
	DSAP, SSAP byte
	Control    byte
}

type Packet ¶

type Packet struct {
	EthHeader
	LinkHeader        // always equals SNAP in EtherTalk
	SNAPProto         // always AppleTalkProto or AARPProto in EtherTalk
	Payload    []byte // marshaled ddp.Packet or aarp.Packet
	Pad        []byte
}

Combines all data in an EtherTalk packet.

EtherTalk packets contain:

an Ethernet header,
an LLC (Logical Link Control) header, which must equal the SNAP (Subnetwork Access Protocol) LinkHeader value,
the SNAP data, indicating either an AppleTalk (DDP) or AARP payload,
the DDP or AARP payload itself, and
optionally, extra padding as specified by the Ethernet header.

func AARP ¶

func AARP(src ethernet.Addr, payload aarp.Packet) (*Packet, error)

func AppleTalk ¶

func AppleTalk(src ethernet.Addr, payload ddp.ExtPacket) (*Packet, error)

type SNAPProto ¶

type SNAPProto struct {
	OUI   [3]byte
	Proto uint16
}

Source Files ¶

View all Source files

packet.go

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