2022-11-25 00:08:14 +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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"errors"
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2022-11-25 04:43:23 +00:00
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"fmt"
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2022-11-25 00:08:14 +00:00
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"math/rand"
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"net"
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"net/netip"
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2022-11-26 15:53:59 +00:00
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"runtime"
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2022-11-25 00:08:14 +00:00
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"sync"
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2022-11-25 10:32:30 +00:00
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"sync/atomic"
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2022-11-25 00:08:14 +00:00
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"time"
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2022-11-25 02:33:37 +00:00
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"github.com/metacubex/quic-go"
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2022-11-25 00:08:14 +00:00
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N "github.com/Dreamacro/clash/common/net"
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2022-11-26 15:53:59 +00:00
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"github.com/Dreamacro/clash/component/dialer"
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2022-11-25 00:08:14 +00:00
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C "github.com/Dreamacro/clash/constant"
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2022-11-25 02:33:37 +00:00
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"github.com/Dreamacro/clash/transport/tuic/congestion"
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2022-11-25 00:08:14 +00:00
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)
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2022-11-25 10:32:30 +00:00
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var (
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ClientClosed = errors.New("tuic: client closed")
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TooManyOpenStreams = errors.New("tuic: too many open streams")
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)
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2022-11-26 15:53:59 +00:00
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type ClientOption struct {
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DialFn func(ctx context.Context, opts ...dialer.Option) (pc net.PacketConn, addr net.Addr, err error)
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2022-11-25 04:43:23 +00:00
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TlsConfig *tls.Config
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QuicConfig *quic.Config
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Host string
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Token [32]byte
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UdpRelayMode string
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CongestionController string
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ReduceRtt bool
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RequestTimeout int
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MaxUdpRelayPacketSize int
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FastOpen bool
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MaxOpenStreams int64
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}
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2022-11-26 15:53:59 +00:00
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type Client struct {
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*ClientOption
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udp bool
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2022-11-25 00:08:14 +00:00
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quicConn quic.Connection
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connMutex sync.Mutex
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2022-11-27 01:38:20 +00:00
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openStreams atomic.Int64
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udpInputMap sync.Map
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2022-11-26 15:53:59 +00:00
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// only ready for PoolClient
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poolRef *PoolClient
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optionRef any
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lastVisited time.Time
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2022-11-25 00:08:14 +00:00
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}
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2022-11-26 15:53:59 +00:00
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func (t *Client) getQuicConn(ctx context.Context) (quic.Connection, error) {
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2022-11-25 00:08:14 +00:00
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t.connMutex.Lock()
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defer t.connMutex.Unlock()
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if t.quicConn != nil {
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return t.quicConn, nil
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}
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2022-11-26 15:53:59 +00:00
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pc, addr, err := t.DialFn(ctx)
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2022-11-25 00:08:14 +00:00
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if err != nil {
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return nil, err
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}
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var quicConn quic.Connection
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if t.ReduceRtt {
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quicConn, err = quic.DialEarlyContext(ctx, pc, addr, t.Host, t.TlsConfig, t.QuicConfig)
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} else {
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quicConn, err = quic.DialContext(ctx, pc, addr, t.Host, t.TlsConfig, t.QuicConfig)
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}
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if err != nil {
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return nil, err
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}
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2022-11-25 02:33:37 +00:00
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switch t.CongestionController {
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case "cubic":
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quicConn.SetCongestionControl(
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congestion.NewCubicSender(
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congestion.DefaultClock{},
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congestion.GetMaxPacketSize(quicConn.RemoteAddr()),
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false,
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nil,
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),
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)
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case "new_reno":
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quicConn.SetCongestionControl(
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congestion.NewCubicSender(
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congestion.DefaultClock{},
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congestion.GetMaxPacketSize(quicConn.RemoteAddr()),
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true,
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nil,
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),
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)
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case "bbr":
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quicConn.SetCongestionControl(
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congestion.NewBBRSender(
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congestion.DefaultClock{},
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congestion.GetMaxPacketSize(quicConn.RemoteAddr()),
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congestion.InitialCongestionWindow,
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congestion.DefaultBBRMaxCongestionWindow,
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),
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)
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}
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2022-11-25 00:08:14 +00:00
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sendAuthentication := func(quicConn quic.Connection) (err error) {
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defer func() {
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t.deferQuicConn(quicConn, err)
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}()
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stream, err := quicConn.OpenUniStream()
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if err != nil {
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return err
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}
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buf := &bytes.Buffer{}
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err = NewAuthenticate(t.Token).WriteTo(buf)
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if err != nil {
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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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return err
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}
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err = stream.Close()
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if err != nil {
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return
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}
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return nil
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}
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2022-11-25 09:15:45 +00:00
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parseUDP := func(quicConn quic.Connection) (err error) {
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2022-11-25 00:08:14 +00:00
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defer func() {
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t.deferQuicConn(quicConn, err)
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}()
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switch t.UdpRelayMode {
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case "quic":
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for {
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var stream quic.ReceiveStream
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stream, err = 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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var assocId uint32
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defer func() {
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t.deferQuicConn(quicConn, err)
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if err != nil && assocId != 0 {
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if val, ok := t.udpInputMap.LoadAndDelete(assocId); ok {
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if conn, ok := val.(net.Conn); ok {
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_ = conn.Close()
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}
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}
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}
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2022-11-25 10:32:30 +00:00
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stream.CancelRead(0)
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2022-11-25 00:08:14 +00:00
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}()
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reader := bufio.NewReader(stream)
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packet, err := ReadPacket(reader)
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if err != nil {
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return
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}
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assocId = packet.ASSOC_ID
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if val, ok := t.udpInputMap.Load(assocId); ok {
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if conn, ok := val.(net.Conn); ok {
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writer := bufio.NewWriterSize(conn, packet.BytesLen())
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_ = packet.WriteTo(writer)
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_ = writer.Flush()
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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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default: // native
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for {
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var message []byte
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message, err = 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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var assocId uint32
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defer func() {
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t.deferQuicConn(quicConn, err)
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if err != nil && assocId != 0 {
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if val, ok := t.udpInputMap.LoadAndDelete(assocId); ok {
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if conn, ok := val.(net.Conn); ok {
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_ = conn.Close()
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}
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}
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}
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}()
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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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assocId = packet.ASSOC_ID
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if val, ok := t.udpInputMap.Load(assocId); ok {
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if conn, ok := val.(net.Conn); ok {
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_, _ = conn.Write(message)
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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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2022-11-25 09:15:45 +00:00
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}
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go sendAuthentication(quicConn)
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2022-11-26 15:53:59 +00:00
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if t.udp {
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2022-11-25 09:15:45 +00:00
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go parseUDP(quicConn)
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}
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2022-11-25 00:08:14 +00:00
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t.quicConn = quicConn
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return quicConn, nil
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}
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func (t *Client) deferQuicConn(quicConn quic.Connection, err error) {
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var netError net.Error
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if err != nil && errors.As(err, &netError) {
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t.connMutex.Lock()
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defer t.connMutex.Unlock()
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if t.quicConn == quicConn {
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2022-11-25 03:32:05 +00:00
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t.Close(err)
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2022-11-25 00:08:14 +00:00
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}
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}
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}
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2022-11-25 03:32:05 +00:00
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func (t *Client) Close(err error) {
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quicConn := t.quicConn
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if quicConn != nil {
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2022-11-25 08:06:56 +00:00
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_ = quicConn.CloseWithError(ProtocolError, err.Error())
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2022-11-25 03:32:05 +00:00
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t.udpInputMap.Range(func(key, value any) bool {
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if conn, ok := value.(net.Conn); ok {
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_ = conn.Close()
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}
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2022-11-25 11:14:09 +00:00
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t.udpInputMap.Delete(key)
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2022-11-25 03:32:05 +00:00
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return true
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})
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t.quicConn = nil
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}
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}
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2022-11-26 15:53:59 +00:00
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func (t *Client) DialContext(ctx context.Context, metadata *C.Metadata) (net.Conn, error) {
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quicConn, err := t.getQuicConn(ctx)
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2022-11-25 00:08:14 +00:00
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if err != nil {
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return nil, err
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}
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2022-11-26 15:53:59 +00:00
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openStreams := t.openStreams.Add(1)
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2022-11-27 01:38:20 +00:00
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if openStreams >= t.MaxOpenStreams {
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2022-11-26 15:53:59 +00:00
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t.openStreams.Add(-1)
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2022-11-25 10:32:30 +00:00
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return nil, TooManyOpenStreams
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}
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2022-11-25 09:15:45 +00:00
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stream, err := func() (stream *quicStreamConn, err error) {
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2022-11-25 03:04:28 +00:00
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defer func() {
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t.deferQuicConn(quicConn, err)
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}()
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buf := &bytes.Buffer{}
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err = NewConnect(NewAddress(metadata)).WriteTo(buf)
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if err != nil {
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return nil, err
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}
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2022-11-25 09:15:45 +00:00
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quicStream, err := quicConn.OpenStream()
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2022-11-25 03:04:28 +00:00
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if err != nil {
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return nil, err
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}
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2022-11-25 11:14:09 +00:00
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stream = &quicStreamConn{
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Stream: quicStream,
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lAddr: quicConn.LocalAddr(),
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rAddr: quicConn.RemoteAddr(),
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client: t,
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}
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2022-11-25 03:04:28 +00:00
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_, err = buf.WriteTo(stream)
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if err != nil {
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2022-11-25 04:43:23 +00:00
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_ = stream.Close()
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2022-11-25 03:04:28 +00:00
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return nil, err
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}
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return stream, err
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2022-11-25 00:08:14 +00:00
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}()
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2022-11-25 04:10:33 +00:00
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if err != nil {
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return nil, err
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}
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2022-11-25 03:04:28 +00:00
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2022-11-25 00:08:14 +00:00
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if t.RequestTimeout > 0 {
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_ = stream.SetReadDeadline(time.Now().Add(time.Duration(t.RequestTimeout) * time.Millisecond))
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}
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2022-11-26 13:14:56 +00:00
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conn := &earlyConn{BufferedConn: N.NewBufferedConn(stream)}
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if !t.FastOpen {
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err = conn.Response()
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if err != nil {
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return nil, err
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}
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}
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return conn, nil
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}
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type earlyConn struct {
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*N.BufferedConn
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resOnce sync.Once
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resErr error
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}
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func (conn *earlyConn) response() error {
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2022-11-25 00:08:14 +00:00
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response, err := ReadResponse(conn)
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if err != nil {
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2022-11-25 08:06:56 +00:00
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_ = conn.Close()
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2022-11-26 13:14:56 +00:00
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return err
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2022-11-25 00:08:14 +00:00
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}
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if response.IsFailed() {
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2022-11-25 08:06:56 +00:00
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_ = conn.Close()
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2022-11-26 13:14:56 +00:00
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return errors.New("connect failed")
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2022-11-25 00:08:14 +00:00
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}
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2022-11-26 13:14:56 +00:00
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_ = conn.SetReadDeadline(time.Time{})
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return nil
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}
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func (conn *earlyConn) Response() error {
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conn.resOnce.Do(func() {
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conn.resErr = conn.response()
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})
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return conn.resErr
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}
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func (conn *earlyConn) Read(b []byte) (n int, err error) {
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err = conn.Response()
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if err != nil {
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return 0, err
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}
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return conn.BufferedConn.Read(b)
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2022-11-25 00:08:14 +00:00
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}
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type quicStreamConn struct {
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quic.Stream
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2022-11-25 11:14:09 +00:00
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lock sync.Mutex
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2022-11-25 03:32:05 +00:00
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lAddr net.Addr
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rAddr net.Addr
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client *Client
|
2022-11-25 12:14:05 +00:00
|
|
|
|
|
|
|
closeOnce sync.Once
|
|
|
|
closeErr error
|
2022-11-25 00:08:14 +00:00
|
|
|
}
|
|
|
|
|
2022-11-25 11:14:09 +00:00
|
|
|
func (q *quicStreamConn) Write(p []byte) (n int, err error) {
|
|
|
|
q.lock.Lock()
|
|
|
|
defer q.lock.Unlock()
|
|
|
|
return q.Stream.Write(p)
|
|
|
|
}
|
|
|
|
|
2022-11-25 08:06:56 +00:00
|
|
|
func (q *quicStreamConn) Close() error {
|
2022-11-25 12:14:05 +00:00
|
|
|
q.closeOnce.Do(func() {
|
|
|
|
q.closeErr = q.close()
|
|
|
|
})
|
|
|
|
return q.closeErr
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamConn) close() error {
|
2022-11-25 11:14:09 +00:00
|
|
|
defer time.AfterFunc(C.DefaultTCPTimeout, func() {
|
2022-11-26 15:53:59 +00:00
|
|
|
q.client.openStreams.Add(-1)
|
2022-11-25 11:14:09 +00:00
|
|
|
})
|
|
|
|
|
|
|
|
// https://github.com/cloudflare/cloudflared/commit/ed2bac026db46b239699ac5ce4fcf122d7cab2cd
|
|
|
|
// Make sure a possible writer does not block the lock forever. We need it, so we can close the writer
|
|
|
|
// side of the stream safely.
|
|
|
|
_ = q.Stream.SetWriteDeadline(time.Now())
|
|
|
|
|
|
|
|
// This lock is eventually acquired despite Write also acquiring it, because we set a deadline to writes.
|
|
|
|
q.lock.Lock()
|
|
|
|
defer q.lock.Unlock()
|
|
|
|
|
|
|
|
// We have to clean up the receiving stream ourselves since the Close in the bottom does not handle that.
|
2022-11-25 08:06:56 +00:00
|
|
|
q.Stream.CancelRead(0)
|
|
|
|
return q.Stream.Close()
|
|
|
|
}
|
|
|
|
|
2022-11-25 00:08:14 +00:00
|
|
|
func (q *quicStreamConn) LocalAddr() net.Addr {
|
|
|
|
return q.lAddr
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamConn) RemoteAddr() net.Addr {
|
|
|
|
return q.rAddr
|
|
|
|
}
|
|
|
|
|
|
|
|
var _ net.Conn = &quicStreamConn{}
|
|
|
|
|
2022-11-26 15:53:59 +00:00
|
|
|
func (t *Client) ListenPacketContext(ctx context.Context, metadata *C.Metadata) (net.PacketConn, error) {
|
|
|
|
quicConn, err := t.getQuicConn(ctx)
|
2022-11-25 00:08:14 +00:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
2022-11-26 15:53:59 +00:00
|
|
|
openStreams := t.openStreams.Add(1)
|
2022-11-27 01:38:20 +00:00
|
|
|
if openStreams >= t.MaxOpenStreams {
|
2022-11-26 15:53:59 +00:00
|
|
|
t.openStreams.Add(-1)
|
2022-11-25 12:14:05 +00:00
|
|
|
return nil, TooManyOpenStreams
|
|
|
|
}
|
2022-11-25 00:08:14 +00:00
|
|
|
|
|
|
|
pipe1, pipe2 := net.Pipe()
|
|
|
|
inputCh := make(chan udpData)
|
|
|
|
var connId uint32
|
|
|
|
for {
|
|
|
|
connId = rand.Uint32()
|
|
|
|
_, loaded := t.udpInputMap.LoadOrStore(connId, pipe1)
|
|
|
|
if !loaded {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
pc := &quicStreamPacketConn{
|
|
|
|
connId: connId,
|
|
|
|
quicConn: quicConn,
|
|
|
|
lAddr: quicConn.LocalAddr(),
|
|
|
|
client: t,
|
|
|
|
inputConn: N.NewBufferedConn(pipe2),
|
|
|
|
inputCh: inputCh,
|
|
|
|
}
|
|
|
|
return pc, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
type udpData struct {
|
|
|
|
data []byte
|
|
|
|
addr net.Addr
|
|
|
|
err error
|
|
|
|
}
|
|
|
|
|
|
|
|
type quicStreamPacketConn struct {
|
|
|
|
connId uint32
|
|
|
|
quicConn quic.Connection
|
|
|
|
lAddr net.Addr
|
|
|
|
client *Client
|
|
|
|
inputConn *N.BufferedConn
|
|
|
|
inputCh chan udpData
|
|
|
|
|
|
|
|
closeOnce sync.Once
|
|
|
|
closeErr error
|
2022-11-25 12:14:05 +00:00
|
|
|
closed bool
|
2022-11-25 00:08:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) Close() error {
|
|
|
|
q.closeOnce.Do(func() {
|
2022-11-25 12:14:05 +00:00
|
|
|
q.closed = true
|
2022-11-25 00:08:14 +00:00
|
|
|
q.closeErr = q.close()
|
|
|
|
})
|
|
|
|
return q.closeErr
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) close() (err error) {
|
2022-11-25 12:14:05 +00:00
|
|
|
defer time.AfterFunc(C.DefaultTCPTimeout, func() {
|
2022-11-26 15:53:59 +00:00
|
|
|
q.client.openStreams.Add(-1)
|
2022-11-25 12:14:05 +00:00
|
|
|
})
|
2022-11-25 00:08:14 +00:00
|
|
|
defer func() {
|
|
|
|
q.client.deferQuicConn(q.quicConn, err)
|
|
|
|
}()
|
|
|
|
buf := &bytes.Buffer{}
|
|
|
|
err = NewDissociate(q.connId).WriteTo(buf)
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
stream, err := q.quicConn.OpenUniStream()
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
_, err = buf.WriteTo(stream)
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
err = stream.Close()
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) SetDeadline(t time.Time) error {
|
|
|
|
//TODO implement me
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) SetReadDeadline(t time.Time) error {
|
|
|
|
return q.inputConn.SetReadDeadline(t)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) SetWriteDeadline(t time.Time) error {
|
|
|
|
//TODO implement me
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
|
|
|
|
packet, err := ReadPacket(q.inputConn)
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
n = copy(p, packet.DATA)
|
|
|
|
addr = packet.ADDR.UDPAddr()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
|
2022-11-25 04:43:23 +00:00
|
|
|
if len(p) > q.client.MaxUdpRelayPacketSize {
|
|
|
|
return 0, fmt.Errorf("udp packet too large(%d > %d)", len(p), q.client.MaxUdpRelayPacketSize)
|
|
|
|
}
|
2022-11-25 12:14:05 +00:00
|
|
|
if q.closed {
|
|
|
|
return 0, net.ErrClosed
|
|
|
|
}
|
2022-11-25 00:08:14 +00:00
|
|
|
defer func() {
|
|
|
|
q.client.deferQuicConn(q.quicConn, err)
|
|
|
|
}()
|
|
|
|
addr.String()
|
|
|
|
buf := &bytes.Buffer{}
|
|
|
|
addrPort, err := netip.ParseAddrPort(addr.String())
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
err = NewPacket(q.connId, uint16(len(p)), NewAddressAddrPort(addrPort), p).WriteTo(buf)
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
switch q.client.UdpRelayMode {
|
|
|
|
case "quic":
|
|
|
|
var stream quic.SendStream
|
|
|
|
stream, err = q.quicConn.OpenUniStream()
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
2022-11-25 10:32:30 +00:00
|
|
|
defer stream.Close()
|
2022-11-25 00:08:14 +00:00
|
|
|
_, err = buf.WriteTo(stream)
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
default: // native
|
|
|
|
err = q.quicConn.SendMessage(buf.Bytes())
|
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
n = len(p)
|
|
|
|
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (q *quicStreamPacketConn) LocalAddr() net.Addr {
|
|
|
|
return q.lAddr
|
|
|
|
}
|
|
|
|
|
|
|
|
var _ net.PacketConn = &quicStreamPacketConn{}
|
2022-11-26 15:53:59 +00:00
|
|
|
|
|
|
|
func NewClient(clientOption *ClientOption, udp bool) *Client {
|
|
|
|
c := &Client{
|
|
|
|
ClientOption: clientOption,
|
|
|
|
udp: udp,
|
|
|
|
}
|
|
|
|
runtime.SetFinalizer(c, closeClient)
|
|
|
|
return c
|
|
|
|
}
|
|
|
|
|
|
|
|
func closeClient(client *Client) {
|
|
|
|
client.Close(ClientClosed)
|
|
|
|
}
|