mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-25 22:56:04 +03:00
354 lines
8.1 KiB
Go
354 lines
8.1 KiB
Go
package trojan
|
|
|
|
import (
|
|
"context"
|
|
"encoding/binary"
|
|
fmt "fmt"
|
|
"io"
|
|
"runtime"
|
|
"syscall"
|
|
|
|
"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/transport/internet/stat"
|
|
"github.com/xtls/xray-core/transport/internet/xtls"
|
|
)
|
|
|
|
var (
|
|
crlf = []byte{'\r', '\n'}
|
|
|
|
addrParser = protocol.NewAddressParser(
|
|
protocol.AddressFamilyByte(0x01, net.AddressFamilyIPv4),
|
|
protocol.AddressFamilyByte(0x04, net.AddressFamilyIPv6),
|
|
protocol.AddressFamilyByte(0x03, net.AddressFamilyDomain),
|
|
)
|
|
|
|
xtls_show = false
|
|
)
|
|
|
|
const (
|
|
maxLength = 8192
|
|
// XRS is constant for XTLS splice mode
|
|
XRS = "xtls-rprx-splice"
|
|
// XRD is constant for XTLS direct mode
|
|
XRD = "xtls-rprx-direct"
|
|
// XRO is constant for XTLS origin mode
|
|
XRO = "xtls-rprx-origin"
|
|
|
|
commandTCP byte = 1
|
|
commandUDP byte = 3
|
|
|
|
// for XTLS
|
|
commandXRD byte = 0xf0 // XTLS direct mode
|
|
commandXRO byte = 0xf1 // XTLS origin mode
|
|
)
|
|
|
|
// ConnWriter is TCP Connection Writer Wrapper for trojan protocol
|
|
type ConnWriter struct {
|
|
io.Writer
|
|
Target net.Destination
|
|
Account *MemoryAccount
|
|
Flow string
|
|
headerSent bool
|
|
}
|
|
|
|
// Write implements io.Writer
|
|
func (c *ConnWriter) Write(p []byte) (n int, err error) {
|
|
if !c.headerSent {
|
|
if err := c.writeHeader(); err != nil {
|
|
return 0, newError("failed to write request header").Base(err)
|
|
}
|
|
}
|
|
|
|
return c.Writer.Write(p)
|
|
}
|
|
|
|
// WriteMultiBuffer implements buf.Writer
|
|
func (c *ConnWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
|
|
defer buf.ReleaseMulti(mb)
|
|
|
|
for _, b := range mb {
|
|
if !b.IsEmpty() {
|
|
if _, err := c.Write(b.Bytes()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *ConnWriter) writeHeader() error {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
command := commandTCP
|
|
if c.Target.Network == net.Network_UDP {
|
|
command = commandUDP
|
|
} else if c.Flow == XRD {
|
|
command = commandXRD
|
|
} else if c.Flow == XRO {
|
|
command = commandXRO
|
|
}
|
|
|
|
if _, err := buffer.Write(c.Account.Key); err != nil {
|
|
return err
|
|
}
|
|
if _, err := buffer.Write(crlf); err != nil {
|
|
return err
|
|
}
|
|
if err := buffer.WriteByte(command); err != nil {
|
|
return err
|
|
}
|
|
if err := addrParser.WriteAddressPort(&buffer, c.Target.Address, c.Target.Port); err != nil {
|
|
return err
|
|
}
|
|
if _, err := buffer.Write(crlf); err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err := c.Writer.Write(buffer.Bytes())
|
|
if err == nil {
|
|
c.headerSent = true
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// PacketWriter UDP Connection Writer Wrapper for trojan protocol
|
|
type PacketWriter struct {
|
|
io.Writer
|
|
Target net.Destination
|
|
}
|
|
|
|
// WriteMultiBuffer implements buf.Writer
|
|
func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
|
|
for {
|
|
mb2, b := buf.SplitFirst(mb)
|
|
mb = mb2
|
|
if b == nil {
|
|
break
|
|
}
|
|
target := &w.Target
|
|
if b.UDP != nil {
|
|
target = b.UDP
|
|
}
|
|
if _, err := w.writePacket(b.Bytes(), *target); err != nil {
|
|
buf.ReleaseMulti(mb)
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (w *PacketWriter) writePacket(payload []byte, dest net.Destination) (int, error) {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
length := len(payload)
|
|
lengthBuf := [2]byte{}
|
|
binary.BigEndian.PutUint16(lengthBuf[:], uint16(length))
|
|
if err := addrParser.WriteAddressPort(&buffer, dest.Address, dest.Port); err != nil {
|
|
return 0, err
|
|
}
|
|
if _, err := buffer.Write(lengthBuf[:]); err != nil {
|
|
return 0, err
|
|
}
|
|
if _, err := buffer.Write(crlf); err != nil {
|
|
return 0, err
|
|
}
|
|
if _, err := buffer.Write(payload); err != nil {
|
|
return 0, err
|
|
}
|
|
_, err := w.Write(buffer.Bytes())
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return length, nil
|
|
}
|
|
|
|
// ConnReader is TCP Connection Reader Wrapper for trojan protocol
|
|
type ConnReader struct {
|
|
io.Reader
|
|
Target net.Destination
|
|
Flow string
|
|
headerParsed bool
|
|
}
|
|
|
|
// ParseHeader parses the trojan protocol header
|
|
func (c *ConnReader) ParseHeader() error {
|
|
var crlf [2]byte
|
|
var command [1]byte
|
|
var hash [56]byte
|
|
if _, err := io.ReadFull(c.Reader, hash[:]); err != nil {
|
|
return newError("failed to read user hash").Base(err)
|
|
}
|
|
|
|
if _, err := io.ReadFull(c.Reader, crlf[:]); err != nil {
|
|
return newError("failed to read crlf").Base(err)
|
|
}
|
|
|
|
if _, err := io.ReadFull(c.Reader, command[:]); err != nil {
|
|
return newError("failed to read command").Base(err)
|
|
}
|
|
|
|
network := net.Network_TCP
|
|
if command[0] == commandUDP {
|
|
network = net.Network_UDP
|
|
} else if command[0] == commandXRD {
|
|
c.Flow = XRD
|
|
} else if command[0] == commandXRO {
|
|
c.Flow = XRO
|
|
}
|
|
|
|
addr, port, err := addrParser.ReadAddressPort(nil, c.Reader)
|
|
if err != nil {
|
|
return newError("failed to read address and port").Base(err)
|
|
}
|
|
c.Target = net.Destination{Network: network, Address: addr, Port: port}
|
|
|
|
if _, err := io.ReadFull(c.Reader, crlf[:]); err != nil {
|
|
return newError("failed to read crlf").Base(err)
|
|
}
|
|
|
|
c.headerParsed = true
|
|
return nil
|
|
}
|
|
|
|
// Read implements io.Reader
|
|
func (c *ConnReader) Read(p []byte) (int, error) {
|
|
if !c.headerParsed {
|
|
if err := c.ParseHeader(); err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
|
|
return c.Reader.Read(p)
|
|
}
|
|
|
|
// ReadMultiBuffer implements buf.Reader
|
|
func (c *ConnReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
|
|
b := buf.New()
|
|
_, err := b.ReadFrom(c)
|
|
return buf.MultiBuffer{b}, err
|
|
}
|
|
|
|
// PacketReader is UDP Connection Reader Wrapper for trojan protocol
|
|
type PacketReader struct {
|
|
io.Reader
|
|
}
|
|
|
|
// ReadMultiBuffer implements buf.Reader
|
|
func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
|
|
addr, port, err := addrParser.ReadAddressPort(nil, r)
|
|
if err != nil {
|
|
return nil, newError("failed to read address and port").Base(err)
|
|
}
|
|
|
|
var lengthBuf [2]byte
|
|
if _, err := io.ReadFull(r, lengthBuf[:]); err != nil {
|
|
return nil, newError("failed to read payload length").Base(err)
|
|
}
|
|
|
|
remain := int(binary.BigEndian.Uint16(lengthBuf[:]))
|
|
if remain > maxLength {
|
|
return nil, newError("oversize payload")
|
|
}
|
|
|
|
var crlf [2]byte
|
|
if _, err := io.ReadFull(r, crlf[:]); err != nil {
|
|
return nil, newError("failed to read crlf").Base(err)
|
|
}
|
|
|
|
dest := net.UDPDestination(addr, port)
|
|
var mb buf.MultiBuffer
|
|
for remain > 0 {
|
|
length := buf.Size
|
|
if remain < length {
|
|
length = remain
|
|
}
|
|
|
|
b := buf.New()
|
|
b.UDP = &dest
|
|
mb = append(mb, b)
|
|
n, err := b.ReadFullFrom(r, int32(length))
|
|
if err != nil {
|
|
buf.ReleaseMulti(mb)
|
|
return nil, newError("failed to read payload").Base(err)
|
|
}
|
|
|
|
remain -= int(n)
|
|
}
|
|
|
|
return mb, nil
|
|
}
|
|
|
|
func ReadV(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn *xtls.Conn, rawConn syscall.RawConn, counter stats.Counter, sctx context.Context) error {
|
|
err := func() error {
|
|
var ct stats.Counter
|
|
for {
|
|
if conn.DirectIn {
|
|
conn.DirectIn = false
|
|
if sctx != nil {
|
|
if inbound := session.InboundFromContext(sctx); inbound != nil && inbound.Conn != nil {
|
|
iConn := inbound.Conn
|
|
statConn, ok := iConn.(*stat.CounterConnection)
|
|
if ok {
|
|
iConn = statConn.Connection
|
|
}
|
|
if xc, ok := iConn.(*xtls.Conn); ok {
|
|
iConn = xc.NetConn()
|
|
}
|
|
if tc, ok := iConn.(*net.TCPConn); ok {
|
|
if conn.SHOW {
|
|
fmt.Println(conn.MARK, "Splice")
|
|
}
|
|
runtime.Gosched() // necessary
|
|
w, err := tc.ReadFrom(conn.NetConn())
|
|
if counter != nil {
|
|
counter.Add(w)
|
|
}
|
|
if statConn != nil && statConn.WriteCounter != nil {
|
|
statConn.WriteCounter.Add(w)
|
|
}
|
|
return err
|
|
} else {
|
|
panic("XTLS Splice: not TCP inbound")
|
|
}
|
|
} else {
|
|
// panic("XTLS Splice: nil inbound or nil inbound.Conn")
|
|
}
|
|
}
|
|
reader = buf.NewReadVReader(conn.NetConn(), rawConn, nil)
|
|
ct = counter
|
|
if conn.SHOW {
|
|
fmt.Println(conn.MARK, "ReadV")
|
|
}
|
|
}
|
|
buffer, err := reader.ReadMultiBuffer()
|
|
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
|
|
}
|