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