mirror of
https://gitclone.com/github.com/MetaCubeX/Clash.Meta
synced 2024-11-16 06:01:21 +08:00
484 lines
11 KiB
Go
484 lines
11 KiB
Go
package v4
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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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"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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"unsafe"
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atomic2 "github.com/Dreamacro/clash/common/atomic"
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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/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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"github.com/Dreamacro/clash/transport/tuic/common"
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"github.com/metacubex/quic-go"
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"github.com/puzpuzpuz/xsync/v2"
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"github.com/zhangyunhao116/fastrand"
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)
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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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Token [32]byte
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UdpRelayMode common.UdpRelayMode
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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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CWND int
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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 *xsync.MapOf[uint32, net.Conn]
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// only ready for PoolClient
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dialerRef C.Dialer
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lastVisited atomic2.TypedValue[time.Time]
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}
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func (t *clientImpl) OpenStreams() int64 {
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return t.openStreams.Load()
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}
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func (t *clientImpl) DialerRef() C.Dialer {
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return t.dialerRef
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}
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func (t *clientImpl) LastVisited() time.Time {
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return t.lastVisited.Load()
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}
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func (t *clientImpl) SetLastVisited(last time.Time) {
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t.lastVisited.Store(last)
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}
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func (t *clientImpl) getQuicConn(ctx context.Context, dialer C.Dialer, dialFn common.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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transport, 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 = transport.DialEarly(ctx, addr, t.TlsConfig, t.QuicConfig)
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} else {
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quicConn, err = transport.Dial(ctx, addr, 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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common.SetCongestionController(quicConn, t.CongestionController, t.CWND)
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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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switch t.UdpRelayMode {
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case common.QUIC:
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_ = t.handleUniStream(quicConn)
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default: // native
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_ = t.handleMessage(quicConn)
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}
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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) handleUniStream(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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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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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 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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if t.udp && t.UdpRelayMode == common.QUIC {
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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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}
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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 (t *clientImpl) handleMessage(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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for {
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var message []byte
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message, err = quicConn.ReceiveMessage(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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}()
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reader := bytes.NewBuffer(message)
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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 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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if t.udp && t.UdpRelayMode == common.NATIVE {
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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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}
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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 (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 uint32, value net.Conn) bool {
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conn := value
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_ = conn.Close()
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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, common.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 common.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, common.TooManyOpenStreams
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}
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stream, err := func() (stream net.Conn, 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 = common.NewQuicStreamConn(
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quicStream,
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quicConn.LocalAddr(),
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quicConn.RemoteAddr(),
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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, common.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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bufConn := N.NewBufferedConn(stream)
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conn := &earlyConn{ExtendedConn: bufConn, bufConn: bufConn, 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.ExtendedConn // only expose standard N.ExtendedConn function to outside
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bufConn *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.bufConn)
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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.bufConn.Read(b)
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}
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func (conn *earlyConn) ReadBuffer(buffer *buf.Buffer) (err error) {
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err = conn.Response()
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if err != nil {
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return err
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}
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return conn.bufConn.ReadBuffer(buffer)
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}
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func (conn *earlyConn) Upstream() any {
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return conn.bufConn
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}
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func (conn *earlyConn) ReaderReplaceable() bool {
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return atomic.LoadUint32((*uint32)(unsafe.Pointer(&conn.resOnce))) == 1 && conn.resErr == nil
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}
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func (conn *earlyConn) WriterReplaceable() bool {
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return true
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}
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func (t *clientImpl) ListenPacketWithDialer(ctx context.Context, metadata *C.Metadata, dialer C.Dialer, dialFn common.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, common.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 = fastrand.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, common.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 common.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 common.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, common.ClientClosed)
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}
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func NewClient(clientOption *ClientOption, udp bool, dialerRef C.Dialer) *Client {
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ci := &clientImpl{
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ClientOption: clientOption,
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udp: udp,
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dialerRef: dialerRef,
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udpInputMap: xsync.NewIntegerMapOf[uint32, net.Conn](),
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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 TuicV4 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 TuicV4 Client at %p", client)
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client.forceClose()
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}
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