peer_protocol

package
v0.0.0-...-53dd17f Latest Latest
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 Go to latest Published: Sep 11, 2024 License: MPL-2.0 Imports: 20 Imported by: 0

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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
	ExtensionBitFast = 2 // http://www.bittorrent.org/beps/bep_0006.html
	// A peer connection initiator can set this when sending a v1 infohash during handshake if they
	// allow the receiving end to upgrade to v2 by responding with the corresponding v2 infohash.
	// BEP 52, and BEP 4. TODO: Set by default and then clear it when it's not appropriate to send.
	ExtensionBitV2Upgrade                    = 4
	ExtensionBitAzureusExtensionNegotiation1 = 16
	ExtensionBitAzureusExtensionNegotiation2 = 17
	// LibTorrent Extension Protocol, http://www.bittorrent.org/beps/bep_0010.html
	ExtensionBitLtep = 20
	// https://wiki.theory.org/BitTorrent_Location-aware_Protocol_1
	ExtensionBitLocationAwareProtocol    = 43
	ExtensionBitAzureusMessagingProtocol = 63 // https://www.bittorrent.org/beps/bep_0004.html

)

https://www.bittorrent.org/beps/bep_0004.html https://wiki.theory.org/BitTorrentSpecification.html#Reserved_Bytes

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 IntegerMax = math.MaxUint32
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
	// This must return *[]byte where the slices can fit data for piece messages. I think we store
	// *[]byte in the pool to avoid an extra allocation every time we put the slice back into the
	// pool. The chunk size should not change for the life of the decoder.
	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.

type ExtendedHandshakeMessage 

type ExtendedHandshakeMessage struct {
	M    map[ExtensionName]ExtensionNumber `bencode:"m"`
	V    string                            `bencode:"v,omitempty"`
	Reqq int                               `bencode:"reqq,omitempty"`
	// The only mention of this I can find is in https://www.bittorrent.org/beps/bep_0011.html
	// for bit 0x01.
	Encryption bool `bencode:"e"`
	// 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 

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

func (ExtendedMetadataRequestMsg) PieceSize 

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 

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 uint8

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

func (*ExtensionNumber) UnmarshalBinary 

func (me *ExtensionNumber) UnmarshalBinary(b []byte) error

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 IntegerKind

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

func (*Integer) UnmarshalBinary 

func (i *Integer) UnmarshalBinary(b []byte) error

type IntegerKind 

type IntegerKind = uint32

An alias for the underlying type of Integer. This is needed for fuzzing.

type Message 

type Message struct {
	PiecesRoot           [32]byte
	Piece                []byte
	Bitfield             []bool
	ExtendedPayload      []byte
	Hashes               [][32]byte
	Index, Begin, Length Integer
	BaseLayer            Integer
	ProofLayers          Integer
	Port                 uint16
	Type                 MessageType
	ExtendedID           ExtensionNumber
	Keepalive            bool
}

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. Fields are ordered to minimize struct size and padding.

func MakeCancelMessage 

func MakeCancelMessage(piece, offset, length Integer) Message

func MetadataExtensionRequestMsg 

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)

func (*Message) UnmarshalBinary 

func (me *Message) UnmarshalBinary(b []byte) error

func (*Message) WriteTo 

func (msg *Message) WriteTo(w MessageWriter) (err error)

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

	// BEP 52
	HashRequest MessageType = 21
	Hashes      MessageType = 22
	HashReject  MessageType = 23
)

func (MessageType) FastExtension 

func (mt MessageType) FastExtension() bool

func (MessageType) String 

func (i MessageType) String() string

func (*MessageType) UnmarshalBinary 

func (mt *MessageType) UnmarshalBinary(b []byte) error

type MessageWriter 

type MessageWriter interface {
	io.ByteWriter
	io.Writer
}

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 (pex 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 

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

Unmarshals and returns a PEX message.

func (*PexMsg) Len 

func (m *PexMsg) Len() int

func (*PexMsg) Message 

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

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