router

package
v1.1.2 Latest Latest
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 Go to latest Published: Oct 20, 2015 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	InitialInterval = 2 * time.Second
	MaxInterval     = 6 * time.Minute
)
View Source 
const (
	EthernetOverhead    = 14
	UDPOverhead         = 28 // 20 bytes for IPv4, 8 bytes for UDP
	Port                = 6783
	HTTPPort            = Port + 1
	DefaultPMTU         = 65535
	MaxUDPPacketSize    = 65535
	ChannelSize         = 16
	FragTestSize        = 60001
	PMTUDiscoverySize   = 60000
	TCPHeartbeat        = 30 * time.Second
	FastHeartbeat       = 500 * time.Millisecond
	SlowHeartbeat       = 10 * time.Second
	FragTestInterval    = 5 * time.Minute
	GossipInterval      = 30 * time.Second
	PMTUVerifyAttempts  = 8
	PMTUVerifyTimeout   = 10 * time.Millisecond // gets doubled with every attempt
	MaxDuration         = time.Duration(math.MaxInt64)
	MaxMissedHeartbeats = 6
	HeartbeatTimeout    = MaxMissedHeartbeats * SlowHeartbeat
	MaxTCPMsgSize       = 10 * 1024 * 1024
)
View Source 
const (
	PeerNameFlavour = "mac"
	NameSize        = 6
	UnknownPeerName = PeerName(0)
)
View Source 
const (
	Protocol           = "weave"
	ProtocolMinVersion = 1
	ProtocolMaxVersion = 2
)
View Source 
const (
	WindowSize = 20 // bits
)

Variables

View Source 
var (
	FragTest      = make([]byte, FragTestSize)
	PMTUDiscovery = make([]byte, PMTUDiscoverySize)
)
View Source 
var (
	ProtocolBytes = []byte(Protocol)

	HeaderTimeout = 10 * time.Second

	ProtocolV1Features = []string{
		"ConnID",
		"Name",
		"NickName",
		"PeerNameFlavour",
		"UID",
	}

	ErrExpectedCrypto   = fmt.Errorf("Password specified, but peer requested an unencrypted connection")
	ErrExpectedNoCrypto = fmt.Errorf("No password specificed, but peer requested an encrypted connection")
)
View Source 
var ErrConnectToSelf = errors.New("Cannot connect to ourself")

Functions

func Concat 

func Concat(elems ...[]byte) []byte

func FormSessionKey 

func FormSessionKey(remotePublicKey, localPrivateKey *[32]byte, secretKey []byte) *[32]byte

func GenerateKeyPair 

func GenerateKeyPair() (publicKey, privateKey *[32]byte, err error)

func GobEncode added in v0.9.0 

func GobEncode(items ...interface{}) []byte

func NewTargetSlice added in v1.1.0 

func NewTargetSlice(cm *ConnectionMaker) []string

func PosixError 

func PosixError(err error) error

func StartLocalConnection added in v1.1.0 

func StartLocalConnection(connRemote *RemoteConnection, tcpConn *net.TCPConn, udpAddr *net.UDPAddr, router *Router, acceptNewPeer bool)

Does not return anything. If the connection is successful, it will end up in the local peer's connections map.

Types

type BroadcastRouteStatus added in v1.1.0 

type BroadcastRouteStatus struct {
	Source string
	Via    []string
}

func NewBroadcastRouteStatusSlice added in v1.1.0 

func NewBroadcastRouteStatusSlice(routes *Routes) []BroadcastRouteStatus

type Config added in v1.0.0 

type Config struct {
	Port               int
	ProtocolMinVersion byte
	Iface              *net.Interface
	Password           []byte
	ConnLimit          int
	PeerDiscovery      bool
	BufSz              int
	LogFrame           LogFrameFunc
}

type Connection 

type Connection interface {
	Local() *Peer
	Remote() *Peer
	RemoteTCPAddr() string
	Outbound() bool
	Established() bool
	BreakTie(Connection) ConnectionTieBreak
	Shutdown(error)
	Log(args ...interface{})
}

type ConnectionAction added in v0.10.0 

type ConnectionAction func() error

type ConnectionMaker 

type ConnectionMaker struct {
	// contains filtered or unexported fields
}

func NewConnectionMaker added in v0.9.0 

func NewConnectionMaker(ourself *LocalPeer, peers *Peers, port int, discovery bool) *ConnectionMaker

func (*ConnectionMaker) ConnectionTerminated 

func (cm *ConnectionMaker) ConnectionTerminated(address string, err error)

func (*ConnectionMaker) ForgetConnections added in v1.0.0 

func (cm *ConnectionMaker) ForgetConnections(peers []string)

func (*ConnectionMaker) InitiateConnections added in v1.0.0 

func (cm *ConnectionMaker) InitiateConnections(peers []string, replace bool) []error

func (*ConnectionMaker) Refresh 

func (cm *ConnectionMaker) Refresh()

type ConnectionMakerAction added in v0.10.0 

type ConnectionMakerAction func() bool

type ConnectionSet added in v0.10.0 

type ConnectionSet map[Connection]struct{}

type ConnectionStatus added in v1.1.0 

type ConnectionStatus struct {
	Name        string
	NickName    string
	Address     string
	Outbound    bool
	Established bool
}

type ConnectionSummary added in v0.11.0 

type ConnectionSummary struct {
	NameByte      []byte
	RemoteTCPAddr string
	Outbound      bool
	Established   bool
}

type ConnectionTieBreak added in v0.9.0 

type ConnectionTieBreak int
const (
	TieBreakWon ConnectionTieBreak = iota
	TieBreakLost
	TieBreakTied
)

type Decryptor 

type Decryptor interface {
	IterateFrames([]byte, FrameConsumer) error
}

type EncryptedTCPReceiver 

type EncryptedTCPReceiver struct {
	// contains filtered or unexported fields
}

func NewEncryptedTCPReceiver 

func NewEncryptedTCPReceiver(receiver TCPReceiver, sessionKey *[32]byte, outbound bool) *EncryptedTCPReceiver

func (*EncryptedTCPReceiver) Receive added in v1.1.0 

func (receiver *EncryptedTCPReceiver) Receive() ([]byte, error)

type EncryptedTCPSender 

type EncryptedTCPSender struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewEncryptedTCPSender 

func NewEncryptedTCPSender(sender TCPSender, sessionKey *[32]byte, outbound bool) *EncryptedTCPSender

func (*EncryptedTCPSender) Send 

func (sender *EncryptedTCPSender) Send(msg []byte) error

type Encryptor 

type Encryptor interface {
	FrameOverhead() int
	PacketOverhead() int
	Bytes() ([]byte, error)
	AppendFrame(src []byte, dst []byte, frame []byte)
	TotalLen() int
}

type EthernetDecoder 

type EthernetDecoder struct {
	Eth layers.Ethernet
	IP  layers.IPv4
	// contains filtered or unexported fields
}

func NewEthernetDecoder 

func NewEthernetDecoder() *EthernetDecoder

func (*EthernetDecoder) DF added in v1.1.0 

func (dec *EthernetDecoder) DF() bool

func (*EthernetDecoder) DecodeLayers 

func (dec *EthernetDecoder) DecodeLayers(data []byte)

func (*EthernetDecoder) DropFrame 

func (dec *EthernetDecoder) DropFrame() bool

func (*EthernetDecoder) IsSpecial added in v0.9.0 

func (dec *EthernetDecoder) IsSpecial() bool

type ForwardedFrame 

type ForwardedFrame struct {
	// contains filtered or unexported fields
}

type Forwarder 

type Forwarder struct {
	// contains filtered or unexported fields
}

func NewForwarder 

func NewForwarder(conn *LocalConnection, enc Encryptor, udpSender UDPSender, pmtu int) *Forwarder

func (*Forwarder) Forward added in v0.10.0 

func (fwd *Forwarder) Forward(frame *ForwardedFrame)

func (*Forwarder) Shutdown added in v0.10.0 

func (fwd *Forwarder) Shutdown()

type ForwarderDF added in v0.10.0 

type ForwarderDF struct {
	Forwarder
	// contains filtered or unexported fields
}

func NewForwarderDF added in v0.10.0 

func NewForwarderDF(conn *LocalConnection, enc Encryptor, udpSender UDPSender, pmtu int) *ForwarderDF

func (*ForwarderDF) PMTUVerified added in v0.10.0 

func (fwd *ForwarderDF) PMTUVerified(pmtu int)

type FrameConsumer 

type FrameConsumer func(src []byte, dst []byte, frame []byte)

type FrameTooBigError 

type FrameTooBigError struct {
	EPMTU int // effective pmtu, i.e. what we tell packet senders
}

func (FrameTooBigError) Error 

func (ftbe FrameTooBigError) Error() string

type GobTCPReceiver added in v1.1.0 

type GobTCPReceiver struct {
	// contains filtered or unexported fields
}

func NewGobTCPReceiver added in v1.1.0 

func NewGobTCPReceiver(decoder *gob.Decoder) *GobTCPReceiver

func (*GobTCPReceiver) Receive added in v1.1.0 

func (receiver *GobTCPReceiver) Receive() ([]byte, error)

type GobTCPSender added in v1.1.0 

type GobTCPSender struct {
	// contains filtered or unexported fields
}

func NewGobTCPSender added in v1.1.0 

func NewGobTCPSender(encoder *gob.Encoder) *GobTCPSender

func (*GobTCPSender) Send added in v1.1.0 

func (sender *GobTCPSender) Send(msg []byte) error

type Gossip added in v0.9.0 

type Gossip interface {
	// specific message from one peer to another
	// intermediate peers relay it using unicast topology.
	GossipUnicast(dstPeerName PeerName, msg []byte) error
	// send gossip to every peer, relayed using broadcast topology.
	GossipBroadcast(update GossipData) error
}

type GossipChannel added in v0.9.0 

type GossipChannel struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewGossipChannel added in v1.0.0 

func NewGossipChannel(channelName string, ourself *LocalPeer, routes *Routes, g Gossiper) *GossipChannel

func (*GossipChannel) GossipBroadcast added in v0.9.0 

func (c *GossipChannel) GossipBroadcast(update GossipData) error

func (*GossipChannel) GossipUnicast added in v0.9.0 

func (c *GossipChannel) GossipUnicast(dstPeerName PeerName, msg []byte) error

func (*GossipChannel) Send added in v0.10.0 

func (c *GossipChannel) Send(srcName PeerName, data GossipData)

func (*GossipChannel) SendDown added in v0.10.0 

func (c *GossipChannel) SendDown(conn Connection, data GossipData)

type GossipChannels added in v1.0.0 

type GossipChannels map[string]*GossipChannel

type GossipData added in v0.10.0 

type GossipData interface {
	Encode() [][]byte
	Merge(GossipData)
}

type GossipSender added in v0.10.0 

type GossipSender struct {
	// contains filtered or unexported fields
}

Accumulates GossipData that needs to be sent to one destination, and sends it when possible.

func NewGossipSender added in v0.10.0 

func NewGossipSender(send func(GossipData)) *GossipSender

func (*GossipSender) Send added in v0.10.0 

func (sender *GossipSender) Send(data GossipData)

func (*GossipSender) Stop added in v0.10.0 

func (sender *GossipSender) Stop()

type Gossiper added in v0.9.0 

type Gossiper interface {
	OnGossipUnicast(sender PeerName, msg []byte) error
	// merge received data into state and return a representation of
	// the received data, for further propagation
	OnGossipBroadcast(sender PeerName, update []byte) (GossipData, error)
	// return state of everything we know; gets called periodically
	Gossip() GossipData
	// merge received data into state and return "everything new I've
	// just learnt", or nil if nothing in the received data was new
	OnGossip(update []byte) (GossipData, error)
}

type LengthPrefixTCPReceiver added in v1.1.0 

type LengthPrefixTCPReceiver struct {
	// contains filtered or unexported fields
}

func NewLengthPrefixTCPReceiver added in v1.1.0 

func NewLengthPrefixTCPReceiver(reader io.Reader) *LengthPrefixTCPReceiver

func (*LengthPrefixTCPReceiver) Receive added in v1.1.0 

func (receiver *LengthPrefixTCPReceiver) Receive() ([]byte, error)

type LengthPrefixTCPSender added in v1.1.0 

type LengthPrefixTCPSender struct {
	// contains filtered or unexported fields
}

func NewLengthPrefixTCPSender added in v1.1.0 

func NewLengthPrefixTCPSender(writer io.Writer) *LengthPrefixTCPSender

func (*LengthPrefixTCPSender) Send added in v1.1.0 

func (sender *LengthPrefixTCPSender) Send(msg []byte) error

type ListOfPeers 

type ListOfPeers []*Peer

func (ListOfPeers) Len 

func (lop ListOfPeers) Len() int

func (ListOfPeers) Less 

func (lop ListOfPeers) Less(i, j int) bool

func (ListOfPeers) Swap 

func (lop ListOfPeers) Swap(i, j int)

type LocalConnection 

type LocalConnection struct {
	sync.RWMutex
	RemoteConnection
	TCPConn *net.TCPConn

	SessionKey *[32]byte

	Decryptor Decryptor
	Router    *Router
	// contains filtered or unexported fields
}

func (*LocalConnection) BreakTie added in v0.9.0 

func (conn *LocalConnection) BreakTie(dupConn Connection) ConnectionTieBreak

func (*LocalConnection) Established 

func (conn *LocalConnection) Established() bool

func (*LocalConnection) Forward 

func (conn *LocalConnection) Forward(frame *ForwardedFrame, dec *EthernetDecoder) error

Called from LocalPeer.Relay[Broadcast] which is itself invoked from router (both UDP listener process and sniffer process).

func (*LocalConnection) ReceivedHeartbeat added in v0.9.0 

func (conn *LocalConnection) ReceivedHeartbeat(remoteUDPAddr *net.UDPAddr, connUID uint64)

Async

Heartbeating serves two purposes: a) keeping NAT paths alive, and b) updating a remote peer's knowledge of our address, in the event it changes (e.g. because NAT paths expired).

func (*LocalConnection) RemoteUDPAddr 

func (conn *LocalConnection) RemoteUDPAddr() *net.UDPAddr

Read by the forwarder processes when in the UDP senders

func (*LocalConnection) Send added in v1.1.0 

func (conn *LocalConnection) Send(df bool, frameBytes []byte) error

Called from connection's actor process, and from the connection's TCP receiver process.

func (*LocalConnection) SendProtocolMsg added in v0.9.0 

func (conn *LocalConnection) SendProtocolMsg(m ProtocolMsg)

Send directly, not via the Actor. If it goes via the Actor we can get a deadlock where LocalConnection is blocked talking to LocalPeer and LocalPeer is blocked trying send a ProtocolMsg via LocalConnection, and the channels are full in both directions so nothing can proceed.

func (*LocalConnection) SetEstablished 

func (conn *LocalConnection) SetEstablished()

Async

func (*LocalConnection) Shutdown 

func (conn *LocalConnection) Shutdown(err error)

Async

type LocalConnectionStatus added in v1.1.0 

type LocalConnectionStatus struct {
	Address  string
	Outbound bool
	State    string
	Info     string
}

func NewLocalConnectionStatusSlice added in v1.1.0 

func NewLocalConnectionStatusSlice(cm *ConnectionMaker) []LocalConnectionStatus

type LocalPeer 

type LocalPeer struct {
	sync.RWMutex
	*Peer
	// contains filtered or unexported fields
}

func NewLocalPeer added in v0.9.0 

func NewLocalPeer(name PeerName, nickName string, router *Router) *LocalPeer

func (*LocalPeer) AddConnection 

func (peer *LocalPeer) AddConnection(conn *LocalConnection) error

Sync.

func (*LocalPeer) Broadcast 

func (peer *LocalPeer) Broadcast(frame []byte, dec *EthernetDecoder)

func (*LocalPeer) ConnectionEstablished 

func (peer *LocalPeer) ConnectionEstablished(conn *LocalConnection)

Async.

func (*LocalPeer) ConnectionTo added in v0.11.0 

func (peer *LocalPeer) ConnectionTo(name PeerName) (Connection, bool)

func (*LocalPeer) Connections added in v0.11.0 

func (peer *LocalPeer) Connections() ConnectionSet

func (*LocalPeer) ConnectionsTo added in v0.10.0 

func (peer *LocalPeer) ConnectionsTo(names []PeerName) []Connection

func (*LocalPeer) CreateConnection 

func (peer *LocalPeer) CreateConnection(peerAddr string, acceptNewPeer bool) error

func (*LocalPeer) DeleteConnection 

func (peer *LocalPeer) DeleteConnection(conn *LocalConnection)

Sync.

func (*LocalPeer) Encode added in v0.11.0 

func (peer *LocalPeer) Encode(enc *gob.Encoder)

func (*LocalPeer) Forward 

func (peer *LocalPeer) Forward(dstPeer *Peer, frame []byte, dec *EthernetDecoder) error

func (*LocalPeer) Relay 

func (peer *LocalPeer) Relay(srcPeer, dstPeer *Peer, frame []byte, dec *EthernetDecoder) error

func (*LocalPeer) RelayBroadcast 

func (peer *LocalPeer) RelayBroadcast(srcPeer *Peer, frame []byte, dec *EthernetDecoder)

type LocalPeerAction added in v0.10.0 

type LocalPeerAction func()

type LogFrameFunc added in v0.10.0 

type LogFrameFunc func(string, []byte, *EthernetDecoder)

type MACStatus added in v1.1.0 

type MACStatus struct {
	Mac      string
	Name     string
	NickName string
	LastSeen time.Time
}

func NewMACStatusSlice added in v1.1.0 

func NewMACStatusSlice(cache *MacCache) []MACStatus

type MacCache 

type MacCache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewMacCache 

func NewMacCache(maxAge time.Duration, onExpiry func(net.HardwareAddr, *Peer)) *MacCache

func (*MacCache) Delete 

func (cache *MacCache) Delete(peer *Peer) bool

func (*MacCache) Enter 

func (cache *MacCache) Enter(mac net.HardwareAddr, peer *Peer) bool

func (*MacCache) Lookup 

func (cache *MacCache) Lookup(mac net.HardwareAddr) (*Peer, bool)

type MacCacheEntry 

type MacCacheEntry struct {
	// contains filtered or unexported fields
}

type MsgTooBigError 

type MsgTooBigError struct {
	PMTU int // actual pmtu, i.e. what the kernel told us
}

func (MsgTooBigError) Error 

func (mtbe MsgTooBigError) Error() string

type NaClDecryptor 

type NaClDecryptor struct {
	NonDecryptor
	// contains filtered or unexported fields
}

func NewNaClDecryptor 

func NewNaClDecryptor(sessionKey *[32]byte, outbound bool) *NaClDecryptor

func (*NaClDecryptor) IterateFrames 

func (nd *NaClDecryptor) IterateFrames(packet []byte, consumer FrameConsumer) error

type NaClDecryptorInstance 

type NaClDecryptorInstance struct {
	// contains filtered or unexported fields
}

func NewNaClDecryptorInstance added in v0.11.0 

func NewNaClDecryptorInstance(outbound bool) *NaClDecryptorInstance

type NaClEncryptor 

type NaClEncryptor struct {
	NonEncryptor
	// contains filtered or unexported fields
}

func NewNaClEncryptor 

func NewNaClEncryptor(prefix []byte, sessionKey *[32]byte, outbound bool, df bool) *NaClEncryptor

func (*NaClEncryptor) Bytes 

func (ne *NaClEncryptor) Bytes() ([]byte, error)

func (*NaClEncryptor) PacketOverhead 

func (ne *NaClEncryptor) PacketOverhead() int

func (*NaClEncryptor) TotalLen 

func (ne *NaClEncryptor) TotalLen() int

type NameCollisionError 

type NameCollisionError struct {
	Name PeerName
}

func (NameCollisionError) Error 

func (nce NameCollisionError) Error() string

type NonDecryptor 

type NonDecryptor struct {
}

func NewNonDecryptor 

func NewNonDecryptor() *NonDecryptor

func (*NonDecryptor) IterateFrames 

func (nd *NonDecryptor) IterateFrames(packet []byte, consumer FrameConsumer) error

type NonEncryptor 

type NonEncryptor struct {
	// contains filtered or unexported fields
}

func NewNonEncryptor 

func NewNonEncryptor(prefix []byte) *NonEncryptor

func (*NonEncryptor) AppendFrame 

func (ne *NonEncryptor) AppendFrame(src []byte, dst []byte, frame []byte)

func (*NonEncryptor) Bytes 

func (ne *NonEncryptor) Bytes() ([]byte, error)

func (*NonEncryptor) FrameOverhead 

func (ne *NonEncryptor) FrameOverhead() int

func (*NonEncryptor) PacketOverhead 

func (ne *NonEncryptor) PacketOverhead() int

func (*NonEncryptor) TotalLen 

func (ne *NonEncryptor) TotalLen() int

type PacketDecodingError 

type PacketDecodingError struct {
	Desc string
}

func (PacketDecodingError) Error 

func (pde PacketDecodingError) Error() string

type PacketSink 

type PacketSink interface {
	WritePacket([]byte) error
}

func NewPcapO 

func NewPcapO(ifName string) (po PacketSink, err error)

type PacketSource 

type PacketSource interface {
	ReadPacket() ([]byte, error)
	Stats() map[string]int
}

type PacketSourceSink 

type PacketSourceSink interface {
	PacketSource
	PacketSink
}

func NewPcapIO 

func NewPcapIO(ifName string, bufSz int) (PacketSourceSink, error)

type PcapIO 

type PcapIO struct {
	// contains filtered or unexported fields
}

func (*PcapIO) ReadPacket 

func (pio *PcapIO) ReadPacket() (data []byte, err error)

func (*PcapIO) Stats added in v1.1.0 

func (pio *PcapIO) Stats() map[string]int

func (*PcapIO) WritePacket 

func (pio *PcapIO) WritePacket(data []byte) error

type Peer 

type Peer struct {
	Name     PeerName
	NameByte []byte
	NickName string
	UID      PeerUID
	// contains filtered or unexported fields
}

func NewPeer 

func NewPeer(name PeerName, nickName string, uid PeerUID, version uint64) *Peer

func (*Peer) Encode added in v0.11.0 

func (peer *Peer) Encode(enc *gob.Encoder)

func (*Peer) ForEachConnectedPeer added in v0.11.0 

func (peer *Peer) ForEachConnectedPeer(establishedAndSymmetric bool, exclude map[PeerName]PeerName, f func(*Peer))

func (*Peer) Routes 

func (peer *Peer) Routes(stopAt *Peer, establishedAndSymmetric bool) (bool, map[PeerName]PeerName)

Calculate the routing table from this peer to all peers reachable from it, returning a "next hop" map of PeerNameX -> PeerNameY, which says "in order to send a message to X, the peer should send the message to its neighbour Y".

Because currently we do not have weightings on the connections between peers, there is no need to use a minimum spanning tree algorithm. Instead we employ the simpler and cheaper breadth-first widening. The computation is deterministic, which ensures that when it is performed on the same data by different peers, they get the same result. This is important since otherwise we risk message loss or routing cycles.

When the 'establishedAndSymmetric' flag is set, only connections that are marked as 'established' and are symmetric (i.e. where both sides indicate they have a connection to the other) are considered.

When a non-nil stopAt peer is supplied, the widening stops when it reaches that peer. The boolean return indicates whether that has happened.

NB: This function should generally be invoked while holding a read lock on Peers and LocalPeer.

func (*Peer) String 

func (peer *Peer) String() string

type PeerName 

type PeerName uint64

PeerName is used as a map key. Since net.HardwareAddr isn't suitable for that - it's a slice, and slices can't be map keys - we convert that to/from uint64.

func PeerNameFromBin 

func PeerNameFromBin(nameByte []byte) PeerName

func PeerNameFromString 

func PeerNameFromString(nameStr string) (PeerName, error)

func PeerNameFromUserInput 

func PeerNameFromUserInput(userInput string) (PeerName, error)

func (PeerName) Bin 

func (name PeerName) Bin() []byte

func (PeerName) String 

func (name PeerName) String() string

type PeerNameSet added in v0.10.0 

type PeerNameSet map[PeerName]struct{}

type PeerStatus added in v1.1.0 

type PeerStatus struct {
	Name        string
	NickName    string
	UID         PeerUID
	Version     uint64
	Connections []ConnectionStatus
}

func NewPeerStatusSlice added in v1.1.0 

func NewPeerStatusSlice(peers *Peers) []PeerStatus

type PeerSummary added in v0.11.0 

type PeerSummary struct {
	NameByte []byte
	NickName string
	UID      PeerUID
	Version  uint64
}

type PeerUID added in v0.11.0 

type PeerUID uint64

func ParsePeerUID added in v0.11.0 

func ParsePeerUID(s string) (PeerUID, error)

type Peers 

type Peers struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewPeers 

func NewPeers(ourself *LocalPeer) *Peers

func (*Peers) ApplyUpdate 

func (peers *Peers) ApplyUpdate(update []byte) (PeerNameSet, PeerNameSet, error)

Merge an incoming update with our own topology.

We add peers hitherto unknown to us, and update peers for which the update contains a more recent version than known to us. The return value is a) a representation of the received update, and b) an "improved" update containing just these new/updated elements.

func (*Peers) Dereference added in v0.11.0 

func (peers *Peers) Dereference(peer *Peer)

func (*Peers) EncodePeers added in v0.10.0 

func (peers *Peers) EncodePeers(names PeerNameSet) []byte

func (*Peers) Fetch 

func (peers *Peers) Fetch(name PeerName) *Peer

func (*Peers) FetchAndAddRef added in v1.1.0 

func (peers *Peers) FetchAndAddRef(name PeerName) *Peer

func (*Peers) FetchWithDefault 

func (peers *Peers) FetchWithDefault(peer *Peer) *Peer

func (*Peers) ForEach 

func (peers *Peers) ForEach(fun func(*Peer))

func (*Peers) GarbageCollect 

func (peers *Peers) GarbageCollect() []*Peer

func (*Peers) Names added in v0.10.0 

func (peers *Peers) Names() PeerNameSet

func (*Peers) OnGC added in v1.1.0 

func (peers *Peers) OnGC(callback func(*Peer))

type ProtocolIntroConn added in v1.1.0 

type ProtocolIntroConn interface {
	// io.Reader
	Read(b []byte) (n int, err error)

	// io.Writer
	Write(b []byte) (n int, err error)

	// net.Conn's deadline methods
	SetDeadline(t time.Time) error
	SetReadDeadline(t time.Time) error
	SetWriteDeadline(t time.Time) error
}

We don't need the full net.TCPConn to do the protocol intro. This interface contains just the parts we do need, to support testing

type ProtocolIntroParams added in v1.1.0 

type ProtocolIntroParams struct {
	MinVersion byte
	MaxVersion byte
	Features   map[string]string
	Conn       ProtocolIntroConn
	Password   []byte
	Outbound   bool
}

func (ProtocolIntroParams) DoIntro added in v1.1.0 

func (params ProtocolIntroParams) DoIntro() (res ProtocolIntroResults, err error)

type ProtocolIntroResults added in v1.1.0 

type ProtocolIntroResults struct {
	Features   map[string]string
	Receiver   TCPReceiver
	Sender     TCPSender
	SessionKey *[32]byte
	Version    byte
}

type ProtocolMsg added in v0.9.0 

type ProtocolMsg struct {
	// contains filtered or unexported fields
}

type ProtocolSender added in v0.9.0 

type ProtocolSender interface {
	SendProtocolMsg(m ProtocolMsg)
}

type ProtocolTag added in v0.9.0 

type ProtocolTag byte
const (
	ProtocolHeartbeat ProtocolTag = iota
	ProtocolConnectionEstablished
	ProtocolFragmentationReceived
	ProtocolPMTUVerified
	ProtocolGossip
	ProtocolGossipUnicast
	ProtocolGossipBroadcast
)

type RawUDPSender 

type RawUDPSender struct {
	// contains filtered or unexported fields
}

func NewRawUDPSender 

func NewRawUDPSender(conn *LocalConnection) (*RawUDPSender, error)

func (*RawUDPSender) Send 

func (sender *RawUDPSender) Send(msg []byte) error

func (*RawUDPSender) Shutdown 

func (sender *RawUDPSender) Shutdown() error

type RemoteConnection 

type RemoteConnection struct {
	// contains filtered or unexported fields
}

func NewRemoteConnection 

func NewRemoteConnection(from, to *Peer, tcpAddr string, outbound bool, established bool) *RemoteConnection

func (*RemoteConnection) BreakTie added in v0.9.0 

func (conn *RemoteConnection) BreakTie(Connection) ConnectionTieBreak

func (*RemoteConnection) ErrorLog added in v1.1.0 

func (conn *RemoteConnection) ErrorLog(args ...interface{})

func (*RemoteConnection) Established 

func (conn *RemoteConnection) Established() bool

func (*RemoteConnection) Local 

func (conn *RemoteConnection) Local() *Peer

func (*RemoteConnection) Log added in v0.10.0 

func (conn *RemoteConnection) Log(args ...interface{})

func (*RemoteConnection) Outbound added in v0.10.0 

func (conn *RemoteConnection) Outbound() bool

func (*RemoteConnection) Remote 

func (conn *RemoteConnection) Remote() *Peer

func (*RemoteConnection) RemoteTCPAddr 

func (conn *RemoteConnection) RemoteTCPAddr() string

func (*RemoteConnection) Shutdown 

func (conn *RemoteConnection) Shutdown(error)

type Router 

type Router struct {
	Config
	Ourself         *LocalPeer
	Macs            *MacCache
	Peers           *Peers
	Routes          *Routes
	ConnectionMaker *ConnectionMaker

	TopologyGossip Gossip
	PacketSource   PacketSource
	UDPListener    *net.UDPConn
	// contains filtered or unexported fields
}

func NewRouter 

func NewRouter(config Config, name PeerName, nickName string) *Router

func (*Router) Gossip added in v0.9.0 

func (router *Router) Gossip() GossipData

func (*Router) HandleHTTP added in v1.1.0 

func (router *Router) HandleHTTP(muxRouter *mux.Router)

func (*Router) NewGossip added in v0.9.0 

func (router *Router) NewGossip(channelName string, g Gossiper) Gossip

func (*Router) OnGossip added in v0.9.0 

func (router *Router) OnGossip(update []byte) (GossipData, error)

func (*Router) OnGossipBroadcast added in v0.9.0 

func (router *Router) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error)

func (*Router) OnGossipUnicast added in v0.9.0 

func (router *Router) OnGossipUnicast(sender PeerName, msg []byte) error

func (*Router) SendAllGossip added in v0.9.0 

func (router *Router) SendAllGossip()

func (*Router) SendAllGossipDown added in v0.9.0 

func (router *Router) SendAllGossipDown(conn Connection)

func (*Router) Start 

func (router *Router) Start()

Start listening for TCP connections, locally captured packets, and packets forwarded over UDP. This is separate from NewRouter so that gossipers can register before we start forming connections.

func (*Router) Stop added in v0.11.0 

func (router *Router) Stop() error

func (*Router) UsingPassword 

func (router *Router) UsingPassword() bool

type Routes 

type Routes struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewRoutes added in v0.9.0 

func NewRoutes(ourself *LocalPeer, peers *Peers) *Routes

func (*Routes) Broadcast 

func (routes *Routes) Broadcast(name PeerName) []PeerName

func (*Routes) BroadcastAll added in v0.10.0 

func (routes *Routes) BroadcastAll(name PeerName) []PeerName

func (*Routes) EnsureRecalculated added in v0.10.0 

func (routes *Routes) EnsureRecalculated()

Wait for any preceding Recalculate requests to be processed.

func (*Routes) PeerNames added in v0.10.0 

func (routes *Routes) PeerNames() PeerNameSet

func (*Routes) RandomNeighbours added in v0.10.0 

func (routes *Routes) RandomNeighbours(except PeerName) PeerNameSet

Choose min(log2(n_peers), n_neighbouring_peers) neighbours, with a random distribution that is topology-sensitive, favouring neighbours at the end of "bottleneck links". We determine the latter based on the unicast routing table. If a neighbour appears as the value more frequently than others - meaning that we reach a higher proportion of peers via that neighbour than other neighbours - then it is chosen with a higher probability.

Note that we choose log2(n_peers) *neighbours*, not peers. Consequently, on sparsely connected peers this function returns a higher proportion of neighbours than elsewhere. In extremis, on peers with fewer than log2(n_peers) neighbours, all neighbours are returned.

func (*Routes) Recalculate 

func (routes *Routes) Recalculate()

Request recalculation of the routing table. This is async but can effectively be made synchronous with a subsequent call to EnsureRecalculated.

func (*Routes) Unicast 

func (routes *Routes) Unicast(name PeerName) (PeerName, bool)

func (*Routes) UnicastAll added in v0.10.0 

func (routes *Routes) UnicastAll(name PeerName) (PeerName, bool)

type SimpleUDPSender 

type SimpleUDPSender struct {
	// contains filtered or unexported fields
}

func NewSimpleUDPSender 

func NewSimpleUDPSender(conn *LocalConnection) *SimpleUDPSender

func (*SimpleUDPSender) Send 

func (sender *SimpleUDPSender) Send(msg []byte) error

func (*SimpleUDPSender) Shutdown 

func (sender *SimpleUDPSender) Shutdown() error

type Status added in v1.1.0 

type Status struct {
	Protocol           string
	ProtocolMinVersion int
	ProtocolMaxVersion int
	Encryption         bool
	PeerDiscovery      bool
	Name               string
	NickName           string
	Port               int
	Interface          string
	CaptureStats       map[string]int
	MACs               []MACStatus
	Peers              []PeerStatus
	UnicastRoutes      []UnicastRouteStatus
	BroadcastRoutes    []BroadcastRouteStatus
	Connections        []LocalConnectionStatus
	Targets            []string
}

func NewStatus added in v1.1.0 

func NewStatus(router *Router) *Status

type SurrogateGossipData added in v1.0.0 

type SurrogateGossipData struct {
	// contains filtered or unexported fields
}

func NewSurrogateGossipData added in v1.0.0 

func NewSurrogateGossipData(msg []byte) *SurrogateGossipData

func (*SurrogateGossipData) Encode added in v1.0.0 

func (d *SurrogateGossipData) Encode() [][]byte

func (*SurrogateGossipData) Merge added in v1.0.0 

func (d *SurrogateGossipData) Merge(other GossipData)

type SurrogateGossiper added in v1.0.0 

type SurrogateGossiper struct{}

func (*SurrogateGossiper) Gossip added in v1.0.0 

func (*SurrogateGossiper) Gossip() GossipData

func (*SurrogateGossiper) OnGossip added in v1.0.0 

func (*SurrogateGossiper) OnGossip(update []byte) (GossipData, error)

func (*SurrogateGossiper) OnGossipBroadcast added in v1.0.0 

func (*SurrogateGossiper) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error)

func (*SurrogateGossiper) OnGossipUnicast added in v1.0.0 

func (*SurrogateGossiper) OnGossipUnicast(sender PeerName, msg []byte) error

type TCPCryptoState added in v0.11.0 

type TCPCryptoState struct {
	// contains filtered or unexported fields
}

The lowest 64 bits of the nonce contain the message sequence number. The top most bit indicates the connection polarity at the sender - '1' for outbound; the next indicates protocol type - '1' for TCP. The remaining 126 bits are zero. The polarity is needed so that the two ends of a connection do not use the same nonces; the protocol type so that the TCP and UDP sender nonces are disjoint. This is a requirement of the NaCl Security Model; see http://nacl.cr.yp.to/box.html.

func NewTCPCryptoState added in v0.11.0 

func NewTCPCryptoState(sessionKey *[32]byte, outbound bool) *TCPCryptoState

type TCPReceiver 

type TCPReceiver interface {
	Receive() ([]byte, error)
}

type TCPSender 

type TCPSender interface {
	Send([]byte) error
}

type Target 

type Target struct {
	// contains filtered or unexported fields
}

Information about an address where we may find a peer

type TokenBucket added in v1.0.2 

type TokenBucket struct {
	// contains filtered or unexported fields
}

func NewTokenBucket added in v1.0.2 

func NewTokenBucket(capacity int64, tokenInterval time.Duration) *TokenBucket

func (*TokenBucket) Wait added in v1.0.2 

func (tb *TokenBucket) Wait()

type TopologyGossipData added in v0.10.0 

type TopologyGossipData struct {
	// contains filtered or unexported fields
}

func NewTopologyGossipData added in v0.10.0 

func NewTopologyGossipData(peers *Peers, update ...*Peer) *TopologyGossipData

func (*TopologyGossipData) Encode added in v0.10.0 

func (d *TopologyGossipData) Encode() [][]byte

func (*TopologyGossipData) Merge added in v0.10.0 

func (d *TopologyGossipData) Merge(other GossipData)

type UDPSender 

type UDPSender interface {
	Send([]byte) error
	Shutdown() error
}

type UnicastRouteStatus added in v1.1.0 

type UnicastRouteStatus struct {
	Dest, Via string
}

func NewUnicastRouteStatusSlice added in v1.1.0 

func NewUnicastRouteStatusSlice(routes *Routes) []UnicastRouteStatus

type UnknownPeerError added in v0.9.0 

type UnknownPeerError struct {
	Name PeerName
}

func (UnknownPeerError) Error added in v0.9.0 

func (upe UnknownPeerError) Error() string

Source Files

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