peer_protocol

package
v1.31.0 Latest Latest
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 Go to latest Published: Sep 2, 2021 License: MPL-2.0 Imports: 16 Imported by: 234

Documentation

Index

Constants

View Source 
const (
	// http://www.bittorrent.org/beps/bep_0011.html
	ExtensionNamePex ExtensionName = "ut_pex"

	ExtensionDeleteNumber ExtensionNumber = 0
)
View Source 
const (
	ExtensionBitDHT      = 0  // http://www.bittorrent.org/beps/bep_0005.html
	ExtensionBitExtended = 20 // http://www.bittorrent.org/beps/bep_0010.html
	ExtensionBitFast     = 2  // http://www.bittorrent.org/beps/bep_0006.html
)
View Source 
const (
	// http://bittorrent.org/beps/bep_0009.html. Note that there's an
	// LT_metadata, but I've never implemented it.
	ExtensionNameMetadata = "ut_metadata"
)
View Source 
const (
	Protocol = "\x13BitTorrent protocol"
)

Variables

This section is empty.

Functions

This section is empty.

Types

type CompactIp 

type CompactIp net.IP

Marshals to the smallest compact byte representation.

func (CompactIp) MarshalBencode 

func (me CompactIp) MarshalBencode() ([]byte, error)

type Decoder 

type Decoder struct {
	R         *bufio.Reader
	Pool      *sync.Pool
	MaxLength Integer // TODO: Should this include the length header or not?
}

func (*Decoder) Decode 

func (d *Decoder) Decode(msg *Message) (err error)

io.EOF is returned if the source terminates cleanly on a message boundary. TODO: Is that before or after the message?

type ExtendedHandshakeMessage 

type ExtendedHandshakeMessage struct {
	M          map[ExtensionName]ExtensionNumber `bencode:"m"`
	V          string                            `bencode:"v,omitempty"`
	Reqq       int                               `bencode:"reqq,omitempty"`
	Encryption bool                              `bencode:"e,omitempty"`
	// BEP 9
	MetadataSize int `bencode:"metadata_size,omitempty"`
	// The local client port. It would be redundant for the receiving side of
	// a connection to send this.
	Port   int       `bencode:"p,omitempty"`
	YourIp CompactIp `bencode:"yourip,omitempty"`
	Ipv4   CompactIp `bencode:"ipv4,omitempty"`
	Ipv6   net.IP    `bencode:"ipv6,omitempty"`
}

http://www.bittorrent.org/beps/bep_0010.html

type ExtendedMetadataRequestMsg added in v1.29.0 

type ExtendedMetadataRequestMsg struct {
	Piece     int                            `bencode:"piece"`
	TotalSize int                            `bencode:"total_size"`
	Type      ExtendedMetadataRequestMsgType `bencode:"msg_type"`
}

func (ExtendedMetadataRequestMsg) PieceSize added in v1.29.0 

func (me ExtendedMetadataRequestMsg) PieceSize() int

Returns the expected piece size for this request message. This is needed to determine the offset into an extension message payload that the request metadata piece data starts.

type ExtendedMetadataRequestMsgType added in v1.29.0 

type ExtendedMetadataRequestMsgType int
const (
	HandshakeExtendedID = 0

	RequestMetadataExtensionMsgType ExtendedMetadataRequestMsgType = 0
	DataMetadataExtensionMsgType    ExtendedMetadataRequestMsgType = 1
	RejectMetadataExtensionMsgType  ExtendedMetadataRequestMsgType = 2
)

type ExtensionBit 

type ExtensionBit uint

type ExtensionName 

type ExtensionName string

http://www.bittorrent.org/beps/bep_0010.html

type ExtensionNumber 

type ExtensionNumber int

http://www.bittorrent.org/beps/bep_0010.html

type HandshakeResult 

type HandshakeResult struct {
	PeerExtensionBits
	PeerID [20]byte
	metainfo.Hash
}

func Handshake 

func Handshake(
	sock io.ReadWriter, ih *metainfo.Hash, peerID [20]byte, extensions PeerExtensionBits,
) (
	res HandshakeResult, err error,
)

ih is nil if we expect the peer to declare the InfoHash, such as when the peer initiated the connection. Returns ok if the Handshake was successful, and err if there was an unexpected condition other than the peer simply abandoning the Handshake.

type Integer 

type Integer uint32

func (Integer) Int 

func (i Integer) Int() int

It's perfectly fine to cast these to an int. TODO: Or is it?

func (*Integer) Read 

func (i *Integer) Read(r io.Reader) error

func (Integer) Uint32 

func (i Integer) Uint32() uint32

func (Integer) Uint64 

func (i Integer) Uint64() uint64

type Message 

type Message struct {
	Keepalive            bool
	Type                 MessageType
	Index, Begin, Length Integer
	Piece                []byte
	Bitfield             []bool
	ExtendedID           ExtensionNumber
	ExtendedPayload      []byte
	Port                 uint16
}

This is a lazy union representing all the possible fields for messages. Go doesn't have ADTs, and I didn't choose to use type-assertions.

func MakeCancelMessage 

func MakeCancelMessage(piece, offset, length Integer) Message

func MetadataExtensionRequestMsg added in v1.29.0 

func MetadataExtensionRequestMsg(peerMetadataExtensionId ExtensionNumber, piece int) Message

func (Message) MarshalBinary 

func (msg Message) MarshalBinary() (data []byte, err error)

func (Message) MustMarshalBinary 

func (msg Message) MustMarshalBinary() []byte

func (Message) RequestSpec 

func (msg Message) RequestSpec() (ret RequestSpec)

type MessageType 

type MessageType byte
const (
	// BEP 3
	Choke         MessageType = 0
	Unchoke       MessageType = 1
	Interested    MessageType = 2
	NotInterested MessageType = 3
	Have          MessageType = 4
	Bitfield      MessageType = 5
	Request       MessageType = 6
	Piece         MessageType = 7
	Cancel        MessageType = 8

	// BEP 5
	Port MessageType = 9

	// BEP 6 - Fast extension
	Suggest     MessageType = 0x0d // 13
	HaveAll     MessageType = 0x0e // 14
	HaveNone    MessageType = 0x0f // 15
	Reject      MessageType = 0x10 // 16
	AllowedFast MessageType = 0x11 // 17

	// BEP 10
	Extended MessageType = 20
)

func (MessageType) FastExtension 

func (mt MessageType) FastExtension() bool

func (MessageType) String 

func (i MessageType) String() string

type PeerExtensionBits 

type PeerExtensionBits [8]byte

func NewPeerExtensionBytes 

func NewPeerExtensionBytes(bits ...ExtensionBit) (ret PeerExtensionBits)

func (PeerExtensionBits) GetBit 

func (pex PeerExtensionBits) GetBit(bit ExtensionBit) bool

func (*PeerExtensionBits) SetBit 

func (pex *PeerExtensionBits) SetBit(bit ExtensionBit, on bool)

func (PeerExtensionBits) String 

func (me PeerExtensionBits) String() string

func (PeerExtensionBits) SupportsDHT 

func (pex PeerExtensionBits) SupportsDHT() bool

func (PeerExtensionBits) SupportsExtended 

func (pex PeerExtensionBits) SupportsExtended() bool

func (PeerExtensionBits) SupportsFast 

func (pex PeerExtensionBits) SupportsFast() bool

type PexMsg 

type PexMsg struct {
	Added       krpc.CompactIPv4NodeAddrs `bencode:"added"`
	AddedFlags  []PexPeerFlags            `bencode:"added.f"`
	Added6      krpc.CompactIPv6NodeAddrs `bencode:"added6"`
	Added6Flags []PexPeerFlags            `bencode:"added6.f"`
	Dropped     krpc.CompactIPv4NodeAddrs `bencode:"dropped"`
	Dropped6    krpc.CompactIPv6NodeAddrs `bencode:"dropped6"`
}

func LoadPexMsg added in v1.16.0 

func LoadPexMsg(b []byte) (ret PexMsg, err error)

func (*PexMsg) Len added in v1.16.0 

func (m *PexMsg) Len() int

func (*PexMsg) Message added in v1.16.0 

func (m *PexMsg) Message(pexExtendedId ExtensionNumber) Message

type PexPeerFlags 

type PexPeerFlags byte
const (
	PexPrefersEncryption PexPeerFlags = 1 << iota
	PexSeedUploadOnly
	PexSupportsUtp
	PexHolepunchSupport
	PexOutgoingConn
)

func (PexPeerFlags) Get 

func (me PexPeerFlags) Get(f PexPeerFlags) bool

type RequestSpec 

type RequestSpec struct {
	Index, Begin, Length Integer
}

func (RequestSpec) String 

func (me RequestSpec) String() string

Source Files

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