Xray-core/proxy/vless/encoding/encoding.go

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package encoding
import (
"bytes"
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"context"
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"io"
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"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"
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"github.com/xtls/xray-core/proxy/vless"
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)
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 errors.New("failed to write request version").Base(err)
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}
if _, err := buffer.Write(request.User.Account.(*vless.MemoryAccount).ID.Bytes()); err != nil {
return errors.New("failed to write request user id").Base(err)
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}
if err := EncodeHeaderAddons(&buffer, requestAddons); err != nil {
return errors.New("failed to encode request header addons").Base(err)
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}
if err := buffer.WriteByte(byte(request.Command)); err != nil {
return errors.New("failed to write request command").Base(err)
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}
if request.Command != protocol.RequestCommandMux {
if err := addrParser.WriteAddressPort(&buffer, request.Address, request.Port); err != nil {
return errors.New("failed to write request address and port").Base(err)
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}
}
if _, err := writer.Write(buffer.Bytes()); err != nil {
return errors.New("failed to write request header").Base(err)
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}
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) {
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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, errors.New("failed to read request version").Base(err)
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}
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, errors.New("failed to read request user id").Base(err)
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}
copy(id[:], buffer.Bytes())
}
if request.User = validator.Get(id); request.User == nil {
return nil, nil, isfb, errors.New("invalid request user id")
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}
if isfb {
first.Advance(17)
}
requestAddons, err := DecodeHeaderAddons(&buffer, reader)
if err != nil {
return nil, nil, false, errors.New("failed to decode request header addons").Base(err)
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}
buffer.Clear()
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
return nil, nil, false, errors.New("failed to read request command").Base(err)
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}
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, errors.New("invalid request address")
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}
return request, requestAddons, false, nil
default:
return nil, nil, isfb, errors.New("invalid request version")
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}
}
// 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 errors.New("failed to write response version").Base(err)
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}
if err := EncodeHeaderAddons(&buffer, responseAddons); err != nil {
return errors.New("failed to encode response header addons").Base(err)
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}
if _, err := writer.Write(buffer.Bytes()); err != nil {
return errors.New("failed to write response header").Base(err)
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}
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, errors.New("failed to read response version").Base(err)
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}
if buffer.Byte(0) != request.Version {
return nil, errors.New("unexpected response version. Expecting ", int(request.Version), " but actually ", int(buffer.Byte(0)))
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}
responseAddons, err := DecodeHeaderAddons(&buffer, reader)
if err != nil {
return nil, errors.New("failed to decode response header addons").Base(err)
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}
return responseAddons, nil
}
// 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 {
err := func() error {
for {
if trafficState.ReaderSwitchToDirectCopy {
var writerConn net.Conn
var inTimer *signal.ActivityTimer
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
writerConn = inbound.Conn
inTimer = inbound.Timer
if inbound.CanSpliceCopy == 2 {
inbound.CanSpliceCopy = 1
}
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if ob != nil && ob.CanSpliceCopy == 2 { // ob need to be passed in due to context can change
ob.CanSpliceCopy = 1
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}
}
return proxy.CopyRawConnIfExist(ctx, conn, writerConn, writer, timer, inTimer)
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}
buffer, err := reader.ReadMultiBuffer()
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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)
}
}
}
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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, ob *session.Outbound, ctx context.Context) error {
err := func() error {
var ct stats.Counter
for {
buffer, err := reader.ReadMultiBuffer()
if trafficState.WriterSwitchToDirectCopy {
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if inbound := session.InboundFromContext(ctx); inbound != nil {
if inbound.CanSpliceCopy == 2 {
inbound.CanSpliceCopy = 1
}
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if ob != nil && ob.CanSpliceCopy == 2 {
ob.CanSpliceCopy = 1
}
}
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
}