mirror of
https://gitclone.com/github.com/MetaCubeX/Clash.Meta
synced 2024-11-15 13:41:23 +08:00
305 lines
7.4 KiB
Go
305 lines
7.4 KiB
Go
package vision
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import (
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"bytes"
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"crypto/subtle"
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gotls "crypto/tls"
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"encoding/binary"
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"fmt"
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"io"
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"net"
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"github.com/Dreamacro/clash/common/buf"
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N "github.com/Dreamacro/clash/common/net"
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"github.com/Dreamacro/clash/log"
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"github.com/gofrs/uuid/v5"
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utls "github.com/sagernet/utls"
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)
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var (
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_ N.ExtendedConn = (*Conn)(nil)
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)
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type Conn struct {
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net.Conn
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N.ExtendedReader
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N.ExtendedWriter
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upstream net.Conn
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userUUID *uuid.UUID
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tlsConn net.Conn
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input *bytes.Reader
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rawInput *bytes.Buffer
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needHandshake bool
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packetsToFilter int
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isTLS bool
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isTLS12orAbove bool
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enableXTLS bool
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cipher uint16
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remainingServerHello uint16
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readRemainingContent int
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readRemainingPadding int
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readProcess bool
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readFilterUUID bool
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readLastCommand byte
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writeFilterApplicationData bool
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writeDirect bool
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}
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func (vc *Conn) Read(b []byte) (int, error) {
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if vc.readProcess {
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buffer := buf.With(b)
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err := vc.ReadBuffer(buffer)
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return buffer.Len(), err
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}
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return vc.ExtendedReader.Read(b)
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}
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func (vc *Conn) ReadBuffer(buffer *buf.Buffer) error {
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toRead := buffer.FreeBytes()
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if vc.readRemainingContent > 0 {
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if vc.readRemainingContent < buffer.FreeLen() {
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toRead = toRead[:vc.readRemainingContent]
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}
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n, err := vc.ExtendedReader.Read(toRead)
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buffer.Truncate(n)
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vc.readRemainingContent -= n
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vc.FilterTLS(toRead)
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return err
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}
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if vc.readRemainingPadding > 0 {
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_, err := io.CopyN(io.Discard, vc.ExtendedReader, int64(vc.readRemainingPadding))
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if err != nil {
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return err
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}
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vc.readRemainingPadding = 0
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}
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if vc.readProcess {
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switch vc.readLastCommand {
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case commandPaddingContinue:
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//if vc.isTLS || vc.packetsToFilter > 0 {
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headerUUIDLen := 0
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if vc.readFilterUUID {
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headerUUIDLen = uuid.Size
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}
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var header []byte
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if need := headerUUIDLen + PaddingHeaderLen - uuid.Size; buffer.FreeLen() < need {
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header = make([]byte, need)
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} else {
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header = buffer.FreeBytes()[:need]
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}
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_, err := io.ReadFull(vc.ExtendedReader, header)
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if err != nil {
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return err
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}
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if vc.readFilterUUID {
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vc.readFilterUUID = false
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if subtle.ConstantTimeCompare(vc.userUUID.Bytes(), header[:uuid.Size]) != 1 {
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err = fmt.Errorf("XTLS Vision server responded unknown UUID: %s",
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uuid.FromBytesOrNil(header[:uuid.Size]).String())
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log.Errorln(err.Error())
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return err
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}
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header = header[uuid.Size:]
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}
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vc.readRemainingPadding = int(binary.BigEndian.Uint16(header[3:]))
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vc.readRemainingContent = int(binary.BigEndian.Uint16(header[1:]))
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vc.readLastCommand = header[0]
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log.Debugln("XTLS Vision read padding: command=%d, payloadLen=%d, paddingLen=%d",
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vc.readLastCommand, vc.readRemainingContent, vc.readRemainingPadding)
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return vc.ReadBuffer(buffer)
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//}
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case commandPaddingEnd:
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vc.readProcess = false
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return vc.ReadBuffer(buffer)
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case commandPaddingDirect:
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needReturn := false
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if vc.input != nil {
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_, err := buffer.ReadFrom(vc.input)
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if err != nil {
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return err
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}
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if vc.input.Len() == 0 {
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needReturn = true
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vc.input = nil
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} else { // buffer is full
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return nil
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}
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}
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if vc.rawInput != nil {
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_, err := buffer.ReadFrom(vc.rawInput)
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if err != nil {
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return err
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}
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needReturn = true
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if vc.rawInput.Len() == 0 {
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vc.rawInput = nil
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}
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}
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if vc.input == nil && vc.rawInput == nil {
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vc.readProcess = false
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vc.ExtendedReader = N.NewExtendedReader(vc.Conn)
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log.Debugln("XTLS Vision direct read start")
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}
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if needReturn {
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return nil
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}
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default:
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err := fmt.Errorf("XTLS Vision read unknown command: %d", vc.readLastCommand)
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log.Debugln(err.Error())
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return err
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}
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}
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return vc.ExtendedReader.ReadBuffer(buffer)
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}
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func (vc *Conn) Write(p []byte) (int, error) {
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if vc.writeFilterApplicationData {
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_buffer := buf.StackNew()
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defer buf.KeepAlive(_buffer)
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buffer := buf.Dup(_buffer)
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defer buffer.Release()
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buffer.Write(p)
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err := vc.WriteBuffer(buffer)
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if err != nil {
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return 0, err
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}
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return len(p), nil
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}
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return vc.ExtendedWriter.Write(p)
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}
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func (vc *Conn) WriteBuffer(buffer *buf.Buffer) (err error) {
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if vc.needHandshake {
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vc.needHandshake = false
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if buffer.IsEmpty() {
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ApplyPadding(buffer, commandPaddingContinue, vc.userUUID, false)
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} else {
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vc.FilterTLS(buffer.Bytes())
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ApplyPadding(buffer, commandPaddingContinue, vc.userUUID, vc.isTLS)
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}
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err = vc.ExtendedWriter.WriteBuffer(buffer)
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if err != nil {
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buffer.Release()
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return err
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}
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switch underlying := vc.tlsConn.(type) {
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case *gotls.Conn:
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if underlying.ConnectionState().Version != gotls.VersionTLS13 {
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buffer.Release()
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return ErrNotTLS13
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}
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case *utls.UConn:
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if underlying.ConnectionState().Version != utls.VersionTLS13 {
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buffer.Release()
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return ErrNotTLS13
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}
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}
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vc.tlsConn = nil
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return nil
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}
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if vc.writeFilterApplicationData {
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buffer2 := ReshapeBuffer(buffer)
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defer buffer2.Release()
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vc.FilterTLS(buffer.Bytes())
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command := commandPaddingContinue
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if !vc.isTLS {
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command = commandPaddingEnd
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// disable XTLS
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//vc.readProcess = false
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vc.writeFilterApplicationData = false
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vc.packetsToFilter = 0
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} else if buffer.Len() > 6 && bytes.Equal(buffer.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
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command = commandPaddingEnd
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if vc.enableXTLS {
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command = commandPaddingDirect
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vc.writeDirect = true
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}
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vc.writeFilterApplicationData = false
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}
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ApplyPadding(buffer, command, nil, vc.isTLS)
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err = vc.ExtendedWriter.WriteBuffer(buffer)
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if err != nil {
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return err
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}
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if vc.writeDirect {
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vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
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log.Debugln("XTLS Vision direct write start")
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//time.Sleep(5 * time.Millisecond)
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}
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if buffer2 != nil {
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if vc.writeDirect || !vc.isTLS {
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return vc.ExtendedWriter.WriteBuffer(buffer2)
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}
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vc.FilterTLS(buffer2.Bytes())
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command = commandPaddingContinue
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if buffer2.Len() > 6 && bytes.Equal(buffer2.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
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command = commandPaddingEnd
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if vc.enableXTLS {
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command = commandPaddingDirect
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vc.writeDirect = true
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}
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vc.writeFilterApplicationData = false
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}
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ApplyPadding(buffer2, command, nil, vc.isTLS)
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err = vc.ExtendedWriter.WriteBuffer(buffer2)
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if vc.writeDirect {
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vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
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log.Debugln("XTLS Vision direct write start")
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//time.Sleep(10 * time.Millisecond)
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}
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}
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return err
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}
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/*if vc.writeDirect {
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log.Debugln("XTLS Vision Direct write, payloadLen=%d", buffer.Len())
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}*/
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return vc.ExtendedWriter.WriteBuffer(buffer)
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}
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func (vc *Conn) FrontHeadroom() int {
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if vc.readFilterUUID {
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return PaddingHeaderLen
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}
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return PaddingHeaderLen - uuid.Size
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}
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func (vc *Conn) NeedHandshake() bool {
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return vc.needHandshake
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}
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func (vc *Conn) Upstream() any {
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if vc.writeDirect ||
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vc.readLastCommand == commandPaddingDirect {
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return vc.Conn
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}
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return vc.upstream
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}
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func (vc *Conn) ReaderPossiblyReplaceable() bool {
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return vc.readProcess
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}
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func (vc *Conn) ReaderReplaceable() bool {
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if !vc.readProcess &&
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vc.readLastCommand == commandPaddingDirect {
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return true
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}
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return false
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}
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func (vc *Conn) WriterPossiblyReplaceable() bool {
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return vc.writeFilterApplicationData
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}
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func (vc *Conn) WriterReplaceable() bool {
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if vc.writeDirect {
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return true
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}
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return false
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}
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