419 lines
9.4 KiB
Go
419 lines
9.4 KiB
Go
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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"math/rand"
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"net"
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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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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"github.com/Dreamacro/clash/log"
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)
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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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type DialFunc func(ctx context.Context, dialer C.Dialer) (pc net.PacketConn, addr net.Addr, err error)
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type ClientOption struct {
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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 time.Duration
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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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type clientImpl struct {
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*ClientOption
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udp bool
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quicConn quic.Connection
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connMutex sync.Mutex
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openStreams atomic.Int64
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closed atomic.Bool
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udpInputMap sync.Map
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// only ready for PoolClient
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dialerRef C.Dialer
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lastVisited time.Time
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}
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func (t *clientImpl) getQuicConn(ctx context.Context, dialer C.Dialer, dialFn DialFunc) (quic.Connection, error) {
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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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pc, addr, err := dialFn(ctx, dialer)
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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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SetCongestionController(quicConn, t.CongestionController)
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go func() {
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_ = t.sendAuthentication(quicConn)
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}()
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if t.udp {
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go func() {
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_ = t.parseUDP(quicConn)
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}()
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}
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t.quicConn = quicConn
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t.openStreams.Store(0)
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return quicConn, nil
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}
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func (t *clientImpl) sendAuthentication(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 := pool.GetBuffer()
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defer pool.PutBuffer(buf)
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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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func (t *clientImpl) parseUDP(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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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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stream.CancelRead(0)
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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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}
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func (t *clientImpl) 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.forceClose(quicConn, err)
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}
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}
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func (t *clientImpl) forceClose(quicConn quic.Connection, err error) {
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t.connMutex.Lock()
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defer t.connMutex.Unlock()
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if quicConn == nil {
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quicConn = t.quicConn
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}
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if quicConn != nil {
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if quicConn == t.quicConn {
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t.quicConn = nil
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}
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}
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errStr := ""
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if err != nil {
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errStr = err.Error()
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}
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if quicConn != nil {
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_ = quicConn.CloseWithError(ProtocolError, errStr)
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}
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udpInputMap := &t.udpInputMap
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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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udpInputMap.Delete(key)
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return true
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})
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}
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func (t *clientImpl) Close() {
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t.closed.Store(true)
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if t.openStreams.Load() == 0 {
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t.forceClose(nil, ClientClosed)
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}
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}
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func (t *clientImpl) DialContextWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.Conn, error) {
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quicConn, err := t.getQuicConn(ctx, dialer, dialFn)
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if err != nil {
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return nil, err
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}
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openStreams := t.openStreams.Add(1)
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if openStreams >= t.MaxOpenStreams {
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t.openStreams.Add(-1)
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return nil, TooManyOpenStreams
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}
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stream, err := func() (stream *quicStreamConn, err error) {
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defer func() {
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t.deferQuicConn(quicConn, err)
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}()
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buf := pool.GetBuffer()
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defer pool.PutBuffer(buf)
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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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quicStream, err := quicConn.OpenStream()
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if err != nil {
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return nil, err
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}
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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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closeDeferFn: func() {
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time.AfterFunc(C.DefaultTCPTimeout, func() {
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openStreams := t.openStreams.Add(-1)
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if openStreams == 0 && t.closed.Load() {
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t.forceClose(quicConn, ClientClosed)
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}
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})
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},
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}
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_, err = buf.WriteTo(stream)
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if err != nil {
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_ = stream.Close()
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return nil, err
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}
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return stream, err
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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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conn := &earlyConn{BufferedConn: N.NewBufferedConn(stream), RequestTimeout: t.RequestTimeout}
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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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RequestTimeout time.Duration
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}
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func (conn *earlyConn) response() error {
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if conn.RequestTimeout > 0 {
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_ = conn.SetReadDeadline(time.Now().Add(conn.RequestTimeout))
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}
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response, err := ReadResponse(conn)
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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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if response.IsFailed() {
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_ = conn.Close()
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return errors.New("connect failed")
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}
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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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}
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func (t *clientImpl) ListenPacketWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.PacketConn, error) {
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quicConn, err := t.getQuicConn(ctx, dialer, dialFn)
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if err != nil {
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return nil, err
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}
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openStreams := t.openStreams.Add(1)
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if openStreams >= t.MaxOpenStreams {
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t.openStreams.Add(-1)
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return nil, TooManyOpenStreams
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}
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pipe1, pipe2 := net.Pipe()
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var connId uint32
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for {
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connId = rand.Uint32()
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_, loaded := t.udpInputMap.LoadOrStore(connId, pipe1)
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if !loaded {
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break
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}
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}
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pc := &quicStreamPacketConn{
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connId: connId,
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quicConn: quicConn,
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inputConn: N.NewBufferedConn(pipe2),
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udpRelayMode: t.UdpRelayMode,
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maxUdpRelayPacketSize: t.MaxUdpRelayPacketSize,
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deferQuicConnFn: t.deferQuicConn,
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closeDeferFn: func() {
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t.udpInputMap.Delete(connId)
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time.AfterFunc(C.DefaultUDPTimeout, func() {
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openStreams := t.openStreams.Add(-1)
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if openStreams == 0 && t.closed.Load() {
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t.forceClose(quicConn, ClientClosed)
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}
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})
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},
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}
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return pc, nil
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}
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type Client struct {
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*clientImpl // use an independent pointer to let Finalizer can work no matter somewhere handle an influence in clientImpl inner
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}
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func (t *Client) DialContextWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.Conn, error) {
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conn, err := t.clientImpl.DialContextWithDialer(ctx, metadata, dialer, dialFn)
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if err != nil {
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return nil, err
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}
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return N.NewRefConn(conn, t), err
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}
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func (t *Client) ListenPacketWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn DialFunc) (net.PacketConn, error) {
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pc, err := t.clientImpl.ListenPacketWithDialer(ctx, metadata, dialer, dialFn)
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if err != nil {
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return nil, err
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}
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return N.NewRefPacketConn(pc, t), nil
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}
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func (t *Client) forceClose() {
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t.clientImpl.forceClose(nil, ClientClosed)
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}
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func NewClient(clientOption *ClientOption, udp bool) *Client {
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ci := &clientImpl{
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ClientOption: clientOption,
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udp: udp,
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}
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c := &Client{ci}
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runtime.SetFinalizer(c, closeClient)
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log.Debugln("New Tuic Client at %p", c)
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return c
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}
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func closeClient(client *Client) {
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log.Debugln("Close Tuic Client at %p", client)
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client.forceClose()
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}
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