package dokodemo //go:generate go run github.com/xtls/xray-core/common/errors/errorgen import ( "context" "sync/atomic" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/errors" "github.com/xtls/xray-core/common/log" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/protocol" "github.com/xtls/xray-core/common/session" "github.com/xtls/xray-core/common/signal" "github.com/xtls/xray-core/common/task" "github.com/xtls/xray-core/core" "github.com/xtls/xray-core/features/policy" "github.com/xtls/xray-core/features/routing" "github.com/xtls/xray-core/transport/internet/stat" ) func init() { common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { d := new(DokodemoDoor) err := core.RequireFeatures(ctx, func(pm policy.Manager) error { return d.Init(config.(*Config), pm, session.SockoptFromContext(ctx)) }) return d, err })) } type DokodemoDoor struct { policyManager policy.Manager config *Config address net.Address port net.Port sockopt *session.Sockopt } // Init initializes the DokodemoDoor instance with necessary parameters. func (d *DokodemoDoor) Init(config *Config, pm policy.Manager, sockopt *session.Sockopt) error { if len(config.Networks) == 0 { return errors.New("no network specified") } d.config = config d.address = config.GetPredefinedAddress() d.port = net.Port(config.Port) d.policyManager = pm d.sockopt = sockopt return nil } // Network implements proxy.Inbound. func (d *DokodemoDoor) Network() []net.Network { return d.config.Networks } func (d *DokodemoDoor) policy() policy.Session { config := d.config p := d.policyManager.ForLevel(config.UserLevel) return p } type hasHandshakeAddressContext interface { HandshakeAddressContext(ctx context.Context) net.Address } // Process implements proxy.Inbound. func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher) error { errors.LogDebug(ctx, "processing connection from: ", conn.RemoteAddr()) dest := net.Destination{ Network: network, Address: d.address, Port: d.port, } destinationOverridden := false if d.config.FollowRedirect { outbounds := session.OutboundsFromContext(ctx) if len(outbounds) > 0 { ob := outbounds[len(outbounds)-1] if ob.Target.IsValid() { dest = ob.Target destinationOverridden = true } } if handshake, ok := conn.(hasHandshakeAddressContext); ok && !destinationOverridden { addr := handshake.HandshakeAddressContext(ctx) if addr != nil { dest.Address = addr destinationOverridden = true } } } if !dest.IsValid() || dest.Address == nil { return errors.New("unable to get destination") } inbound := session.InboundFromContext(ctx) inbound.Name = "dokodemo-door" inbound.CanSpliceCopy = 1 inbound.User = &protocol.MemoryUser{ Level: d.config.UserLevel, } ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{ From: conn.RemoteAddr(), To: dest, Status: log.AccessAccepted, Reason: "", }) errors.LogInfo(ctx, "received request for ", conn.RemoteAddr()) plcy := d.policy() ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle) if inbound != nil { inbound.Timer = timer } ctx = policy.ContextWithBufferPolicy(ctx, plcy.Buffer) link, err := dispatcher.Dispatch(ctx, dest) if err != nil { return errors.New("failed to dispatch request").Base(err) } requestCount := int32(1) requestDone := func() error { defer func() { if atomic.AddInt32(&requestCount, -1) == 0 { timer.SetTimeout(plcy.Timeouts.DownlinkOnly) } }() var reader buf.Reader if dest.Network == net.Network_UDP { reader = buf.NewPacketReader(conn) } else { reader = buf.NewReader(conn) } if err := buf.Copy(reader, link.Writer, buf.UpdateActivity(timer)); err != nil { return errors.New("failed to transport request").Base(err) } return nil } tproxyRequest := func() error { return nil } var writer buf.Writer if network == net.Network_TCP { writer = buf.NewWriter(conn) } else { // if we are in TPROXY mode, use linux's udp forging functionality if !destinationOverridden { writer = &buf.SequentialWriter{Writer: conn} } else { back := conn.RemoteAddr().(*net.UDPAddr) if !dest.Address.Family().IsIP() { if len(back.IP) == 4 { dest.Address = net.AnyIP } else { dest.Address = net.AnyIPv6 } } addr := &net.UDPAddr{ IP: dest.Address.IP(), Port: int(dest.Port), } var mark int if d.sockopt != nil { mark = int(d.sockopt.Mark) } pConn, err := FakeUDP(addr, mark) if err != nil { return err } writer = NewPacketWriter(pConn, &dest, mark, back) defer writer.(*PacketWriter).Close() /* sockopt := &internet.SocketConfig{ Tproxy: internet.SocketConfig_TProxy, } if dest.Address.Family().IsIP() { sockopt.BindAddress = dest.Address.IP() sockopt.BindPort = uint32(dest.Port) } if d.sockopt != nil { sockopt.Mark = d.sockopt.Mark } tConn, err := internet.DialSystem(ctx, net.DestinationFromAddr(conn.RemoteAddr()), sockopt) if err != nil { return err } defer tConn.Close() writer = &buf.SequentialWriter{Writer: tConn} tReader := buf.NewPacketReader(tConn) requestCount++ tproxyRequest = func() error { defer func() { if atomic.AddInt32(&requestCount, -1) == 0 { timer.SetTimeout(plcy.Timeouts.DownlinkOnly) } }() if err := buf.Copy(tReader, link.Writer, buf.UpdateActivity(timer)); err != nil { return errors.New("failed to transport request (TPROXY conn)").Base(err) } return nil } */ } } responseDone := func() error { defer timer.SetTimeout(plcy.Timeouts.UplinkOnly) if err := buf.Copy(link.Reader, writer, buf.UpdateActivity(timer)); err != nil { return errors.New("failed to transport response").Base(err) } return nil } if err := task.Run(ctx, task.OnSuccess(func() error { return task.Run(ctx, requestDone, tproxyRequest) }, task.Close(link.Writer)), responseDone); err != nil { common.Interrupt(link.Reader) common.Interrupt(link.Writer) return errors.New("connection ends").Base(err) } return nil } func NewPacketWriter(conn net.PacketConn, d *net.Destination, mark int, back *net.UDPAddr) buf.Writer { writer := &PacketWriter{ conn: conn, conns: make(map[net.Destination]net.PacketConn), mark: mark, back: back, } writer.conns[*d] = conn return writer } type PacketWriter struct { conn net.PacketConn conns map[net.Destination]net.PacketConn mark int back *net.UDPAddr } func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error { for { mb2, b := buf.SplitFirst(mb) mb = mb2 if b == nil { break } var err error if b.UDP != nil && b.UDP.Address.Family().IsIP() { conn := w.conns[*b.UDP] if conn == nil { conn, err = FakeUDP( &net.UDPAddr{ IP: b.UDP.Address.IP(), Port: int(b.UDP.Port), }, w.mark, ) if err != nil { errors.LogInfo(context.Background(), err.Error()) b.Release() continue } w.conns[*b.UDP] = conn } _, err = conn.WriteTo(b.Bytes(), w.back) if err != nil { errors.LogInfo(context.Background(), err.Error()) w.conns[*b.UDP] = nil conn.Close() } b.Release() } else { _, err = w.conn.WriteTo(b.Bytes(), w.back) b.Release() if err != nil { buf.ReleaseMulti(mb) return err } } } return nil } func (w *PacketWriter) Close() error { for _, conn := range w.conns { if conn != nil { conn.Close() } } return nil }