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dokodemo.go
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dokodemo.go
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package dokodemo
import (
"sync"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/common/alloc"
v2io "v2ray.com/core/common/io"
"v2ray.com/core/common/loader"
"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/proxy"
"v2ray.com/core/proxy/registry"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
type DokodemoDoor struct {
tcpMutex sync.RWMutex
udpMutex sync.RWMutex
config *Config
accepting bool
address v2net.Address
port v2net.Port
packetDispatcher dispatcher.PacketDispatcher
tcpListener *internet.TCPHub
udpHub *udp.UDPHub
udpServer *udp.UDPServer
meta *proxy.InboundHandlerMeta
}
func NewDokodemoDoor(config *Config, space app.Space, meta *proxy.InboundHandlerMeta) *DokodemoDoor {
d := &DokodemoDoor{
config: config,
address: config.GetPredefinedAddress(),
port: v2net.Port(config.Port),
meta: meta,
}
space.InitializeApplication(func() error {
if !space.HasApp(dispatcher.APP_ID) {
log.Error("Dokodemo: Dispatcher is not found in the space.")
return app.ErrMissingApplication
}
d.packetDispatcher = space.GetApp(dispatcher.APP_ID).(dispatcher.PacketDispatcher)
return nil
})
return d
}
func (this *DokodemoDoor) Port() v2net.Port {
return this.meta.Port
}
func (this *DokodemoDoor) Close() {
this.accepting = false
if this.tcpListener != nil {
this.tcpMutex.Lock()
this.tcpListener.Close()
this.tcpListener = nil
this.tcpMutex.Unlock()
}
if this.udpHub != nil {
this.udpMutex.Lock()
this.udpHub.Close()
this.udpHub = nil
this.udpMutex.Unlock()
}
}
func (this *DokodemoDoor) Start() error {
if this.accepting {
return nil
}
this.accepting = true
if this.config.NetworkList.HasNetwork(v2net.Network_TCP) {
err := this.ListenTCP()
if err != nil {
return err
}
}
if this.config.NetworkList.HasNetwork(v2net.Network_UDP) {
err := this.ListenUDP()
if err != nil {
return err
}
}
return nil
}
func (this *DokodemoDoor) ListenUDP() error {
this.udpServer = udp.NewUDPServer(this.packetDispatcher)
udpHub, err := udp.ListenUDP(
this.meta.Address, this.meta.Port, udp.ListenOption{
Callback: this.handleUDPPackets,
ReceiveOriginalDest: this.config.FollowRedirect,
})
if err != nil {
log.Error("Dokodemo failed to listen on ", this.meta.Address, ":", this.meta.Port, ": ", err)
return err
}
this.udpMutex.Lock()
this.udpHub = udpHub
this.udpMutex.Unlock()
return nil
}
func (this *DokodemoDoor) handleUDPPackets(payload *alloc.Buffer, session *proxy.SessionInfo) {
if session.Destination.Network == v2net.Network_Unknown && this.address != nil && this.port > 0 {
session.Destination = v2net.UDPDestination(this.address, this.port)
}
if session.Destination.Network == v2net.Network_Unknown {
log.Info("Dokodemo: Unknown destination, stop forwarding...")
return
}
session.Inbound = this.meta
this.udpServer.Dispatch(session, payload, this.handleUDPResponse)
}
func (this *DokodemoDoor) handleUDPResponse(dest v2net.Destination, payload *alloc.Buffer) {
defer payload.Release()
this.udpMutex.RLock()
defer this.udpMutex.RUnlock()
if !this.accepting {
return
}
this.udpHub.WriteTo(payload.Value, dest)
}
func (this *DokodemoDoor) ListenTCP() error {
tcpListener, err := internet.ListenTCP(this.meta.Address, this.meta.Port, this.HandleTCPConnection, this.meta.StreamSettings)
if err != nil {
log.Error("Dokodemo: Failed to listen on ", this.meta.Address, ":", this.meta.Port, ": ", err)
return err
}
this.tcpMutex.Lock()
this.tcpListener = tcpListener
this.tcpMutex.Unlock()
return nil
}
func (this *DokodemoDoor) HandleTCPConnection(conn internet.Connection) {
defer conn.Close()
var dest v2net.Destination
if this.config.FollowRedirect {
originalDest := GetOriginalDestination(conn)
if originalDest.Network != v2net.Network_Unknown {
log.Info("Dokodemo: Following redirect to: ", originalDest)
dest = originalDest
}
}
if dest.Network == v2net.Network_Unknown && this.address != nil && this.port > v2net.Port(0) {
dest = v2net.TCPDestination(this.address, this.port)
}
if dest.Network == v2net.Network_Unknown {
log.Info("Dokodemo: Unknown destination, stop forwarding...")
return
}
log.Info("Dokodemo: Handling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(&proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
Inbound: this.meta,
})
defer ray.InboundOutput().Release()
var wg sync.WaitGroup
reader := v2net.NewTimeOutReader(this.config.Timeout, conn)
defer reader.Release()
wg.Add(1)
go func() {
v2reader := v2io.NewAdaptiveReader(reader)
defer v2reader.Release()
v2io.Pipe(v2reader, ray.InboundInput())
wg.Done()
ray.InboundInput().Close()
}()
wg.Add(1)
go func() {
v2writer := v2io.NewAdaptiveWriter(conn)
defer v2writer.Release()
v2io.Pipe(ray.InboundOutput(), v2writer)
wg.Done()
}()
wg.Wait()
}
type Factory struct{}
func (this *Factory) StreamCapability() v2net.NetworkList {
return v2net.NetworkList{
Network: []v2net.Network{v2net.Network_RawTCP},
}
}
func (this *Factory) Create(space app.Space, rawConfig interface{}, meta *proxy.InboundHandlerMeta) (proxy.InboundHandler, error) {
return NewDokodemoDoor(rawConfig.(*Config), space, meta), nil
}
func init() {
registry.MustRegisterInboundHandlerCreator(loader.GetType(new(Config)), new(Factory))
}