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types.go
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types.go
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package router
import (
"bytes"
"code.google.com/p/go-bit/bit"
"code.google.com/p/gopacket"
"code.google.com/p/gopacket/layers"
"encoding/gob"
"net"
"sync"
"time"
)
type Router struct {
Iface *net.Interface
Ourself *LocalPeer
Macs *MacCache
Peers *Peers
Routes *Routes
ConnectionMaker *ConnectionMaker
UDPListener *net.UDPConn
Password *[]byte
ConnLimit int
BufSz int
LogFrame func(string, []byte, *layers.Ethernet)
}
type Connection interface {
Local() *Peer
Remote() *Peer
RemoteTCPAddr() string
Established() bool
Shutdown()
}
type RemoteConnection struct {
local *Peer
remote *Peer
remoteTCPAddr string
}
type LocalConnection struct {
sync.RWMutex
RemoteConnection
TCPConn *net.TCPConn
tcpSender TCPSender
remoteUDPAddr *net.UDPAddr
established bool
stackFrag bool
effectivePMTU int
SessionKey *[32]byte
heartbeat *time.Ticker
fetchAll *time.Ticker
fragTest *time.Ticker
forwardChan chan<- *ForwardedFrame
forwardChanDF chan<- *ForwardedFrame
stopForward chan<- interface{}
stopForwardDF chan<- interface{}
verifyPMTU chan<- int
Decryptor Decryptor
Router *Router
UID uint64
shutdown bool
queryChan chan<- *ConnectionInteraction
}
type ConnectionInteraction struct {
Interaction
payload interface{}
}
type Forwarder struct {
conn *LocalConnection
ch <-chan *ForwardedFrame
stop <-chan interface{}
verifyPMTUTick <-chan time.Time
verifyPMTU <-chan int
pmtuVerifyCount uint
enc Encryptor
udpSender UDPSender
maxPayload int
pmtuVerified bool
highestGoodPMTU int
unverifiedPMTU int
lowestBadPMTU int
}
type UDPPacket struct {
Name PeerName
Packet []byte
Sender *net.UDPAddr
}
type EthernetDecoder struct {
eth layers.Ethernet
ip layers.IPv4
decoded []gopacket.LayerType
parser *gopacket.DecodingLayerParser
}
type MsgTooBigError struct {
PMTU int // actual pmtu, i.e. what the kernel told us
}
type FrameTooBigError struct {
EPMTU int // effective pmtu, i.e. what we tell packet senders
}
type UnknownPeersError struct {
}
type NameCollisionError struct {
Name PeerName
}
type PacketDecodingError struct {
Fatal bool
Desc string
}
type LocalAddress struct {
ip net.IP
network *net.IPNet
}
type ForwardedFrame struct {
srcPeer *Peer
dstPeer *Peer
frame []byte
}
type Interaction struct {
code int
resultChan chan<- interface{}
}
// UDPSender interface and implementations
type UDPSender interface {
Send([]byte) error
Shutdown() error
}
type SimpleUDPSender struct {
conn *LocalConnection
udpConn *net.UDPConn
}
type RawUDPSender struct {
ipBuf gopacket.SerializeBuffer
opts gopacket.SerializeOptions
udpHeader *layers.UDP
socket *net.IPConn
conn *LocalConnection
}
// TCPSender interface and implementations
type TCPSender interface {
Send([]byte) error
}
type SimpleTCPSender struct {
encoder *gob.Encoder
}
type EncryptedTCPSender struct {
sync.RWMutex
outerEncoder *gob.Encoder
innerEncoder *gob.Encoder
buffer *bytes.Buffer
conn *LocalConnection
msgCount int
}
type EncryptedTCPMessage struct {
Number int
Body []byte
}
// TCPReceiver interface and implementations
type TCPReceiver interface {
Decode([]byte) ([]byte, error)
}
type SimpleTCPReceiver struct {
}
type EncryptedTCPReceiver struct {
conn *LocalConnection
decoder *gob.Decoder
buffer *bytes.Buffer
msgCount int
}
// Encryptor interface and implementations
type Encryptor interface {
FrameOverhead() int
PacketOverhead() int
IsEmpty() bool
Bytes() []byte
AppendFrame(*ForwardedFrame)
TotalLen() int
}
type NonEncryptor struct {
buf []byte
bufTail []byte
buffered int
prefixLen int
}
type NaClEncryptor struct {
NonEncryptor
buf []byte
offset uint16
nonce *[24]byte
nonceChan chan *[24]byte
flags uint16
prefixLen int
conn *LocalConnection
df bool
}
// Decryptor interface and implementations
type FrameConsumer func(*LocalConnection, *net.UDPAddr, []byte, []byte, uint16, []byte) error
type Decryptor interface {
IterateFrames(FrameConsumer, *UDPPacket) error
ReceiveNonce([]byte)
Shutdown()
}
type NonDecryptor struct {
conn *LocalConnection
}
type NaClDecryptor struct {
NonDecryptor
instance *NaClDecryptorInstance
instanceDF *NaClDecryptorInstance
}
type NaClDecryptorInstance struct {
nonce *[24]byte
previousNonce *[24]byte
usedOffsets *bit.Set
previousUsedOffsets *bit.Set
highestOffsetSeen uint16
nonceChan chan *[24]byte
}
// Packet capture/inject interfaces
type PacketSource interface {
ReadPacket() ([]byte, error)
}
type PacketSink interface {
WritePacket([]byte) error
}
type PacketSourceSink interface {
PacketSource
PacketSink
}