2022-11-28 09:09:25 +00:00
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package tuic
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"sync"
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2022-11-28 10:18:51 +00:00
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"sync/atomic"
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2022-11-28 09:09:25 +00:00
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"time"
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"github.com/gofrs/uuid"
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"github.com/metacubex/quic-go"
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N "github.com/Dreamacro/clash/common/net"
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"github.com/Dreamacro/clash/common/pool"
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C "github.com/Dreamacro/clash/constant"
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2022-11-28 10:18:51 +00:00
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"github.com/Dreamacro/clash/transport/socks5"
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2022-11-28 09:09:25 +00:00
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)
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type ServerOption struct {
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2022-11-28 10:18:51 +00:00
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HandleTcpFn func(conn net.Conn, addr socks5.Addr) error
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HandleUdpFn func(addr socks5.Addr, packet C.UDPPacket) error
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2022-11-28 09:09:25 +00:00
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TlsConfig *tls.Config
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QuicConfig *quic.Config
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Tokens [][32]byte
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CongestionController string
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AuthenticationTimeout time.Duration
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MaxUdpRelayPacketSize int
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}
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type Server struct {
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*ServerOption
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listener quic.EarlyListener
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}
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func NewServer(option *ServerOption, pc net.PacketConn) (*Server, error) {
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listener, err := quic.ListenEarly(pc, option.TlsConfig, option.QuicConfig)
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if err != nil {
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return nil, err
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}
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return &Server{
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ServerOption: option,
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listener: listener,
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}, err
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}
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func (s *Server) Serve() error {
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for {
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conn, err := s.listener.Accept(context.Background())
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if err != nil {
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return err
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}
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uuid, err := uuid.NewV4()
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if err != nil {
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return err
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}
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h := &serverHandler{
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Server: s,
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quicConn: conn,
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uuid: uuid,
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authCh: make(chan struct{}),
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}
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go h.handle()
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}
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}
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func (s *Server) Close() error {
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return s.listener.Close()
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}
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type serverHandler struct {
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*Server
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quicConn quic.Connection
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uuid uuid.UUID
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authCh chan struct{}
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authOk bool
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authOnce sync.Once
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udpInputMap sync.Map
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}
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func (s *serverHandler) handle() {
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time.AfterFunc(s.AuthenticationTimeout, func() {
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s.authOnce.Do(func() {
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_ = s.quicConn.CloseWithError(AuthenticationTimeout, "")
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s.authOk = false
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close(s.authCh)
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})
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})
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go func() {
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_ = s.handleUniStream()
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}()
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go func() {
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_ = s.handleStream()
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}()
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go func() {
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_ = s.handleMessage()
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}()
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}
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func (s *serverHandler) handleMessage() (err error) {
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for {
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var message []byte
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message, err = s.quicConn.ReceiveMessage()
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if err != nil {
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return err
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}
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go func() (err error) {
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buffer := bytes.NewBuffer(message)
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packet, err := ReadPacket(buffer)
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if err != nil {
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return
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}
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return s.parsePacket(packet, "native")
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}()
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}
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}
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func (s *serverHandler) parsePacket(packet Packet, udpRelayMode string) (err error) {
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<-s.authCh
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if !s.authOk {
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return
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}
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var assocId uint32
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assocId = packet.ASSOC_ID
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v, _ := s.udpInputMap.LoadOrStore(assocId, &atomic.Bool{})
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writeClosed := v.(*atomic.Bool)
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if writeClosed.Load() {
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return nil
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}
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pc := &quicStreamPacketConn{
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connId: assocId,
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quicConn: s.quicConn,
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lAddr: s.quicConn.LocalAddr(),
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inputConn: nil,
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udpRelayMode: udpRelayMode,
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maxUdpRelayPacketSize: s.MaxUdpRelayPacketSize,
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ref: s,
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deferQuicConnFn: nil,
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closeDeferFn: nil,
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writeClosed: writeClosed,
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}
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return s.HandleUdpFn(packet.ADDR.SocksAddr(), &serverUDPPacket{
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pc: pc,
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packet: &packet,
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rAddr: s.genServerAssocIdAddr(assocId),
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})
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}
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func (s *serverHandler) genServerAssocIdAddr(assocId uint32) net.Addr {
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return ServerAssocIdAddr(fmt.Sprintf("tuic-%s-%d", s.uuid.String(), assocId))
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}
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func (s *serverHandler) handleStream() (err error) {
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for {
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var quicStream quic.Stream
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quicStream, err = s.quicConn.AcceptStream(context.Background())
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if err != nil {
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return err
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}
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go func() (err error) {
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stream := &quicStreamConn{
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Stream: quicStream,
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lAddr: s.quicConn.LocalAddr(),
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rAddr: s.quicConn.RemoteAddr(),
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ref: s,
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}
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conn := N.NewBufferedConn(stream)
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connect, err := ReadConnect(conn)
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if err != nil {
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return err
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}
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<-s.authCh
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if !s.authOk {
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return conn.Close()
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}
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buf := pool.GetBuffer()
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defer pool.PutBuffer(buf)
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err = s.HandleTcpFn(conn, connect.ADDR.SocksAddr())
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if err != nil {
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err = NewResponseFailed().WriteTo(buf)
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}
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err = NewResponseSucceed().WriteTo(buf)
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if err != nil {
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_ = conn.Close()
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return err
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}
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_, err = buf.WriteTo(stream)
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if err != nil {
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_ = conn.Close()
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return err
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}
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return
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}()
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}
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}
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func (s *serverHandler) handleUniStream() (err error) {
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for {
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var stream quic.ReceiveStream
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stream, err = s.quicConn.AcceptUniStream(context.Background())
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if err != nil {
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return err
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}
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go func() (err error) {
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defer func() {
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stream.CancelRead(0)
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}()
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reader := bufio.NewReader(stream)
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commandHead, err := ReadCommandHead(reader)
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if err != nil {
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return
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}
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switch commandHead.TYPE {
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case AuthenticateType:
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var authenticate Authenticate
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authenticate, err = ReadAuthenticateWithHead(commandHead, reader)
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if err != nil {
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return
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}
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ok := false
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for _, tkn := range s.Tokens {
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if authenticate.TKN == tkn {
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ok = true
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break
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}
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}
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s.authOnce.Do(func() {
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if !ok {
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_ = s.quicConn.CloseWithError(AuthenticationFailed, "")
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}
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s.authOk = ok
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close(s.authCh)
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})
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case PacketType:
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var packet Packet
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packet, err = ReadPacketWithHead(commandHead, reader)
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if err != nil {
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return
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}
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return s.parsePacket(packet, "quic")
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case DissociateType:
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var disassociate Dissociate
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disassociate, err = ReadDissociateWithHead(commandHead, reader)
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if err != nil {
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return
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}
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if v, loaded := s.udpInputMap.LoadAndDelete(disassociate.ASSOC_ID); loaded {
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writeClosed := v.(*atomic.Bool)
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writeClosed.Store(true)
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}
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}
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return
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}()
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}
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}
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type ServerAssocIdAddr string
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func (a ServerAssocIdAddr) Network() string {
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return "ServerAssocIdAddr"
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}
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func (a ServerAssocIdAddr) String() string {
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return string(a)
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}
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type serverUDPPacket struct {
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pc *quicStreamPacketConn
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packet *Packet
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rAddr net.Addr
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}
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func (s *serverUDPPacket) InAddr() net.Addr {
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return s.pc.LocalAddr()
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}
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func (s *serverUDPPacket) LocalAddr() net.Addr {
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return s.rAddr
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}
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func (s *serverUDPPacket) Data() []byte {
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return s.packet.DATA
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}
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func (s *serverUDPPacket) WriteBack(b []byte, addr net.Addr) (n int, err error) {
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return s.pc.WriteTo(b, addr)
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}
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func (s *serverUDPPacket) Drop() {
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s.packet.DATA = nil
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}
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var _ C.UDPPacket = &serverUDPPacket{}
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var _ C.UDPPacketInAddr = &serverUDPPacket{}
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