package encoding //go:generate go run github.com/xtls/xray-core/common/errors/errorgen import ( "bytes" "context" "io" "github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/errors" "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/features/stats" "github.com/xtls/xray-core/proxy" "github.com/xtls/xray-core/proxy/vless" ) const ( Version = byte(0) ) var addrParser = protocol.NewAddressParser( protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4), protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain), protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6), protocol.PortThenAddress(), ) // EncodeRequestHeader writes encoded request header into the given writer. func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons) error { buffer := buf.StackNew() defer buffer.Release() if err := buffer.WriteByte(request.Version); err != nil { return newError("failed to write request version").Base(err) } if _, err := buffer.Write(request.User.Account.(*vless.MemoryAccount).ID.Bytes()); err != nil { return newError("failed to write request user id").Base(err) } if err := EncodeHeaderAddons(&buffer, requestAddons); err != nil { return newError("failed to encode request header addons").Base(err) } if err := buffer.WriteByte(byte(request.Command)); err != nil { return newError("failed to write request command").Base(err) } if request.Command != protocol.RequestCommandMux { if err := addrParser.WriteAddressPort(&buffer, request.Address, request.Port); err != nil { return newError("failed to write request address and port").Base(err) } } if _, err := writer.Write(buffer.Bytes()); err != nil { return newError("failed to write request header").Base(err) } return nil } // DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream. func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator *vless.Validator) (*protocol.RequestHeader, *Addons, bool, error) { buffer := buf.StackNew() defer buffer.Release() request := new(protocol.RequestHeader) if isfb { request.Version = first.Byte(0) } else { if _, err := buffer.ReadFullFrom(reader, 1); err != nil { return nil, nil, false, newError("failed to read request version").Base(err) } request.Version = buffer.Byte(0) } switch request.Version { case 0: var id [16]byte if isfb { copy(id[:], first.BytesRange(1, 17)) } else { buffer.Clear() if _, err := buffer.ReadFullFrom(reader, 16); err != nil { return nil, nil, false, newError("failed to read request user id").Base(err) } copy(id[:], buffer.Bytes()) } if request.User = validator.Get(id); request.User == nil { return nil, nil, isfb, newError("invalid request user id") } if isfb { first.Advance(17) } requestAddons, err := DecodeHeaderAddons(&buffer, reader) if err != nil { return nil, nil, false, newError("failed to decode request header addons").Base(err) } buffer.Clear() if _, err := buffer.ReadFullFrom(reader, 1); err != nil { return nil, nil, false, newError("failed to read request command").Base(err) } request.Command = protocol.RequestCommand(buffer.Byte(0)) switch request.Command { case protocol.RequestCommandMux: request.Address = net.DomainAddress("v1.mux.cool") request.Port = 0 case protocol.RequestCommandTCP, protocol.RequestCommandUDP: if addr, port, err := addrParser.ReadAddressPort(&buffer, reader); err == nil { request.Address = addr request.Port = port } } if request.Address == nil { return nil, nil, false, newError("invalid request address") } return request, requestAddons, false, nil default: return nil, nil, isfb, newError("invalid request version") } } // EncodeResponseHeader writes encoded response header into the given writer. func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *Addons) error { buffer := buf.StackNew() defer buffer.Release() if err := buffer.WriteByte(request.Version); err != nil { return newError("failed to write response version").Base(err) } if err := EncodeHeaderAddons(&buffer, responseAddons); err != nil { return newError("failed to encode response header addons").Base(err) } if _, err := writer.Write(buffer.Bytes()); err != nil { return newError("failed to write response header").Base(err) } return nil } // DecodeResponseHeader decodes and returns (if successful) a ResponseHeader from an input stream. func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*Addons, error) { buffer := buf.StackNew() defer buffer.Release() if _, err := buffer.ReadFullFrom(reader, 1); err != nil { return nil, newError("failed to read response version").Base(err) } if buffer.Byte(0) != request.Version { return nil, newError("unexpected response version. Expecting ", int(request.Version), " but actually ", int(buffer.Byte(0))) } responseAddons, err := DecodeHeaderAddons(&buffer, reader) if err != nil { return nil, newError("failed to decode response header addons").Base(err) } return responseAddons, nil } // XtlsRead filter and read xtls protocol func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, input *bytes.Reader, rawInput *bytes.Buffer, trafficState *proxy.TrafficState, ctx context.Context) error { err := func() error { visionReader := proxy.NewVisionReader(reader, trafficState, ctx) for { if trafficState.ReaderSwitchToDirectCopy { var writerConn net.Conn if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil { writerConn = inbound.Conn if inbound.CanSpliceCopy == 2 { inbound.CanSpliceCopy = 1 // force the value to 1, don't use setter } } return proxy.CopyRawConnIfExist(ctx, conn, writerConn, writer, timer) } buffer, err := visionReader.ReadMultiBuffer() if !buffer.IsEmpty() { timer.Update() if trafficState.ReaderSwitchToDirectCopy { // XTLS Vision processes struct TLS Conn's input and rawInput if inputBuffer, err := buf.ReadFrom(input); err == nil { if !inputBuffer.IsEmpty() { buffer, _ = buf.MergeMulti(buffer, inputBuffer) } } if rawInputBuffer, err := buf.ReadFrom(rawInput); err == nil { if !rawInputBuffer.IsEmpty() { buffer, _ = buf.MergeMulti(buffer, rawInputBuffer) } } } if werr := writer.WriteMultiBuffer(buffer); werr != nil { return werr } } if err != nil { return err } } }() if err != nil && errors.Cause(err) != io.EOF { return err } return nil } // XtlsWrite filter and write xtls protocol func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, trafficState *proxy.TrafficState, ctx context.Context) error { err := func() error { var ct stats.Counter for { buffer, err := reader.ReadMultiBuffer() if trafficState.WriterSwitchToDirectCopy { if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.CanSpliceCopy == 2 { inbound.CanSpliceCopy = 1 // force the value to 1, don't use setter } rawConn, _, writerCounter := proxy.UnwrapRawConn(conn) writer = buf.NewWriter(rawConn) ct = writerCounter trafficState.WriterSwitchToDirectCopy = false } if !buffer.IsEmpty() { if ct != nil { ct.Add(int64(buffer.Len())) } timer.Update() if werr := writer.WriteMultiBuffer(buffer); werr != nil { return werr } } if err != nil { return err } } }() if err != nil && errors.Cause(err) != io.EOF { return err } return nil }