mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-13 04:13:16 +00:00
305 lines
7.3 KiB
Go
305 lines
7.3 KiB
Go
package tuic
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import (
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"context"
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"crypto/tls"
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"io"
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"net"
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"runtime"
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"sync"
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"time"
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"github.com/sagernet/quic-go"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/baderror"
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"github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"github.com/gofrs/uuid/v5"
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)
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type ClientOptions struct {
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Context context.Context
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Dialer N.Dialer
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ServerAddress M.Socksaddr
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TLSConfig *tls.Config
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UUID uuid.UUID
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Password string
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CongestionControl string
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UDPStream bool
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ZeroRTTHandshake bool
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Heartbeat time.Duration
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}
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type Client struct {
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ctx context.Context
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dialer N.Dialer
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serverAddr M.Socksaddr
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tlsConfig *tls.Config
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quicConfig *quic.Config
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uuid uuid.UUID
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password string
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congestionControl string
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udpStream bool
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zeroRTTHandshake bool
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heartbeat time.Duration
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connAccess sync.RWMutex
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conn *clientQUICConnection
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}
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func NewClient(options ClientOptions) (*Client, error) {
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if options.Heartbeat == 0 {
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options.Heartbeat = 10 * time.Second
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}
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quicConfig := &quic.Config{
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DisablePathMTUDiscovery: !(runtime.GOOS == "windows" || runtime.GOOS == "linux" || runtime.GOOS == "android" || runtime.GOOS == "darwin"),
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MaxDatagramFrameSize: 1400,
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EnableDatagrams: true,
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MaxIncomingUniStreams: 1 << 60,
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}
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switch options.CongestionControl {
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case "":
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options.CongestionControl = "cubic"
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case "cubic", "new_reno", "bbr":
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default:
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return nil, E.New("unknown congestion control algorithm: ", options.CongestionControl)
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}
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return &Client{
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ctx: options.Context,
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dialer: options.Dialer,
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serverAddr: options.ServerAddress,
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tlsConfig: options.TLSConfig,
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quicConfig: quicConfig,
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uuid: options.UUID,
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password: options.Password,
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congestionControl: options.CongestionControl,
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udpStream: options.UDPStream,
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zeroRTTHandshake: options.ZeroRTTHandshake,
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heartbeat: options.Heartbeat,
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}, nil
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}
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func (c *Client) offer(ctx context.Context) (*clientQUICConnection, error) {
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conn := c.conn
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if conn != nil && conn.active() {
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return conn, nil
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}
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c.connAccess.Lock()
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defer c.connAccess.Unlock()
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conn = c.conn
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if conn != nil && conn.active() {
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return conn, nil
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}
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conn, err := c.offerNew(ctx)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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func (c *Client) offerNew(ctx context.Context) (*clientQUICConnection, error) {
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udpConn, err := c.dialer.DialContext(ctx, "udp", c.serverAddr)
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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 c.zeroRTTHandshake {
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quicConn, err = quic.DialEarly(ctx, bufio.NewUnbindPacketConn(udpConn), udpConn.RemoteAddr(), c.tlsConfig, c.quicConfig)
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} else {
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quicConn, err = quic.Dial(ctx, bufio.NewUnbindPacketConn(udpConn), udpConn.RemoteAddr(), c.tlsConfig, c.quicConfig)
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}
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if err != nil {
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udpConn.Close()
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return nil, E.Cause(err, "open connection")
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}
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setCongestion(c.ctx, quicConn, c.congestionControl)
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conn := &clientQUICConnection{
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quicConn: quicConn,
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rawConn: udpConn,
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connDone: make(chan struct{}),
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udpConnMap: make(map[uint16]*udpPacketConn),
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}
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go func() {
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hErr := c.clientHandshake(quicConn)
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if hErr != nil {
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conn.closeWithError(hErr)
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}
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}()
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if c.udpStream {
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go c.loopUniStreams(conn)
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}
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go c.loopMessages(conn)
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go c.loopHeartbeats(conn)
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c.conn = conn
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return conn, nil
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}
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func (c *Client) clientHandshake(conn quic.Connection) error {
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authStream, err := conn.OpenUniStream()
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if err != nil {
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return err
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}
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defer authStream.Close()
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handshakeState := conn.ConnectionState().TLS
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tuicAuthToken, err := handshakeState.ExportKeyingMaterial(string(c.uuid[:]), []byte(c.password), 32)
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if err != nil {
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return err
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}
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authRequest := buf.NewSize(AuthenticateLen)
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authRequest.WriteByte(Version)
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authRequest.WriteByte(CommandAuthenticate)
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authRequest.Write(c.uuid[:])
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authRequest.Write(tuicAuthToken)
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return common.Error(authStream.Write(authRequest.Bytes()))
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}
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func (c *Client) loopHeartbeats(conn *clientQUICConnection) {
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ticker := time.NewTicker(c.heartbeat)
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defer ticker.Stop()
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for {
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select {
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case <-conn.connDone:
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return
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case <-ticker.C:
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err := conn.quicConn.SendMessage([]byte{Version, CommandHeartbeat})
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if err != nil {
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conn.closeWithError(E.Cause(err, "send heartbeat"))
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}
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}
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}
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}
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func (c *Client) DialConn(ctx context.Context, destination M.Socksaddr) (net.Conn, error) {
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conn, err := c.offer(ctx)
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if err != nil {
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return nil, err
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}
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stream, err := conn.quicConn.OpenStream()
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if err != nil {
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return nil, err
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}
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return &clientConn{
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Stream: stream,
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parent: conn,
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destination: destination,
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}, nil
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}
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func (c *Client) ListenPacket(ctx context.Context) (net.PacketConn, error) {
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conn, err := c.offer(ctx)
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if err != nil {
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return nil, err
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}
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var sessionID uint16
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clientPacketConn := newUDPPacketConn(ctx, conn.quicConn, c.udpStream, false, func() {
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conn.udpAccess.Lock()
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delete(conn.udpConnMap, sessionID)
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conn.udpAccess.Unlock()
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})
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conn.udpAccess.Lock()
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sessionID = conn.udpSessionID
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conn.udpSessionID++
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conn.udpConnMap[sessionID] = clientPacketConn
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conn.udpAccess.Unlock()
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clientPacketConn.sessionID = sessionID
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return clientPacketConn, nil
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}
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func (c *Client) CloseWithError(err error) error {
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conn := c.conn
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if conn != nil {
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conn.closeWithError(err)
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}
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return nil
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}
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type clientQUICConnection struct {
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quicConn quic.Connection
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rawConn io.Closer
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closeOnce sync.Once
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connDone chan struct{}
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connErr error
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udpAccess sync.RWMutex
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udpConnMap map[uint16]*udpPacketConn
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udpSessionID uint16
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}
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func (c *clientQUICConnection) active() bool {
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select {
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case <-c.quicConn.Context().Done():
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return false
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default:
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}
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select {
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case <-c.connDone:
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return false
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default:
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}
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return true
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}
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func (c *clientQUICConnection) closeWithError(err error) {
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c.closeOnce.Do(func() {
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c.connErr = err
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close(c.connDone)
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_ = c.quicConn.CloseWithError(0, "")
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_ = c.rawConn.Close()
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})
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}
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type clientConn struct {
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quic.Stream
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parent *clientQUICConnection
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destination M.Socksaddr
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requestWritten bool
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}
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func (c *clientConn) NeedHandshake() bool {
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return !c.requestWritten
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}
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func (c *clientConn) Read(b []byte) (n int, err error) {
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n, err = c.Stream.Read(b)
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return n, baderror.WrapQUIC(err)
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}
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func (c *clientConn) Write(b []byte) (n int, err error) {
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if !c.requestWritten {
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request := buf.NewSize(2 + addressSerializer.AddrPortLen(c.destination) + len(b))
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defer request.Release()
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request.WriteByte(Version)
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request.WriteByte(CommandConnect)
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err = addressSerializer.WriteAddrPort(request, c.destination)
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if err != nil {
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return
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}
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request.Write(b)
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_, err = c.Stream.Write(request.Bytes())
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if err != nil {
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c.parent.closeWithError(E.Cause(err, "create new connection"))
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return 0, baderror.WrapQUIC(err)
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}
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c.requestWritten = true
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return len(b), nil
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}
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n, err = c.Stream.Write(b)
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return n, baderror.WrapQUIC(err)
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}
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func (c *clientConn) Close() error {
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c.Stream.CancelRead(0)
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return c.Stream.Close()
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}
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func (c *clientConn) LocalAddr() net.Addr {
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return M.Socksaddr{}
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}
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func (c *clientConn) RemoteAddr() net.Addr {
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return c.destination
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}
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