423 lines
9.8 KiB
Go
423 lines
9.8 KiB
Go
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package core
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import (
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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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"fmt"
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"github.com/Dreamacro/clash/transport/hysteria/obfs"
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"github.com/Dreamacro/clash/transport/hysteria/pmtud_fix"
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"github.com/Dreamacro/clash/transport/hysteria/transport"
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"github.com/Dreamacro/clash/transport/hysteria/utils"
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"github.com/lucas-clemente/quic-go"
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"github.com/lucas-clemente/quic-go/congestion"
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"github.com/lunixbochs/struc"
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"math/rand"
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"net"
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"strconv"
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"sync"
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"time"
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)
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var (
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ErrClosed = errors.New("closed")
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)
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type CongestionFactory func(refBPS uint64) congestion.CongestionControl
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type Client struct {
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transport *transport.ClientTransport
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serverAddr string
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protocol string
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sendBPS, recvBPS uint64
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auth []byte
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congestionFactory CongestionFactory
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obfuscator obfs.Obfuscator
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tlsConfig *tls.Config
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quicConfig *quic.Config
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quicSession quic.Connection
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reconnectMutex sync.Mutex
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closed bool
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udpSessionMutex sync.RWMutex
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udpSessionMap map[uint32]chan *udpMessage
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udpDefragger defragger
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}
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func NewClient(serverAddr string, protocol string, auth []byte, tlsConfig *tls.Config, quicConfig *quic.Config,
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transport *transport.ClientTransport, sendBPS uint64, recvBPS uint64, congestionFactory CongestionFactory,
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obfuscator obfs.Obfuscator) (*Client, error) {
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quicConfig.DisablePathMTUDiscovery = quicConfig.DisablePathMTUDiscovery || pmtud_fix.DisablePathMTUDiscovery
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c := &Client{
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transport: transport,
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serverAddr: serverAddr,
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protocol: protocol,
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sendBPS: sendBPS,
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recvBPS: recvBPS,
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auth: auth,
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congestionFactory: congestionFactory,
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obfuscator: obfuscator,
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tlsConfig: tlsConfig,
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quicConfig: quicConfig,
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}
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return c, nil
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}
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func (c *Client) connectToServer(dialer transport.PacketDialer) error {
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qs, err := c.transport.QUICDial(c.protocol, c.serverAddr, c.tlsConfig, c.quicConfig, c.obfuscator, dialer)
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if err != nil {
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return err
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}
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// Control stream
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ctx, ctxCancel := context.WithTimeout(context.Background(), protocolTimeout)
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stream, err := qs.OpenStreamSync(ctx)
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ctxCancel()
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if err != nil {
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_ = qs.CloseWithError(closeErrorCodeProtocol, "protocol error")
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return err
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}
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ok, msg, err := c.handleControlStream(qs, stream)
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if err != nil {
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_ = qs.CloseWithError(closeErrorCodeProtocol, "protocol error")
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return err
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}
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if !ok {
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_ = qs.CloseWithError(closeErrorCodeAuth, "auth error")
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return fmt.Errorf("auth error: %s", msg)
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}
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// All good
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c.udpSessionMap = make(map[uint32]chan *udpMessage)
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go c.handleMessage(qs)
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c.quicSession = qs
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return nil
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}
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func (c *Client) handleControlStream(qs quic.Connection, stream quic.Stream) (bool, string, error) {
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// Send protocol version
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_, err := stream.Write([]byte{protocolVersion})
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if err != nil {
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return false, "", err
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}
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// Send client hello
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err = struc.Pack(stream, &clientHello{
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Rate: transmissionRate{
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SendBPS: c.sendBPS,
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RecvBPS: c.recvBPS,
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},
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Auth: c.auth,
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})
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if err != nil {
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return false, "", err
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}
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// Receive server hello
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var sh serverHello
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err = struc.Unpack(stream, &sh)
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if err != nil {
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return false, "", err
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}
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// Set the congestion accordingly
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if sh.OK && c.congestionFactory != nil {
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qs.SetCongestionControl(c.congestionFactory(sh.Rate.RecvBPS))
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}
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return sh.OK, sh.Message, nil
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}
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func (c *Client) handleMessage(qs quic.Connection) {
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for {
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msg, err := qs.ReceiveMessage()
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if err != nil {
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break
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}
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var udpMsg udpMessage
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err = struc.Unpack(bytes.NewBuffer(msg), &udpMsg)
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if err != nil {
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continue
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}
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dfMsg := c.udpDefragger.Feed(udpMsg)
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if dfMsg == nil {
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continue
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}
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c.udpSessionMutex.RLock()
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ch, ok := c.udpSessionMap[dfMsg.SessionID]
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if ok {
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select {
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case ch <- dfMsg:
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// OK
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default:
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// Silently drop the message when the channel is full
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}
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}
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c.udpSessionMutex.RUnlock()
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}
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}
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func (c *Client) openStreamWithReconnect(dialer transport.PacketDialer) (quic.Connection, quic.Stream, error) {
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c.reconnectMutex.Lock()
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defer c.reconnectMutex.Unlock()
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if c.closed {
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return nil, nil, ErrClosed
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}
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if c.quicSession == nil {
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if err := c.connectToServer(dialer); err != nil {
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// Still error, oops
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return nil, nil, err
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}
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}
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stream, err := c.quicSession.OpenStream()
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if err == nil {
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// All good
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return c.quicSession, &wrappedQUICStream{stream}, nil
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}
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// Something is wrong
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if nErr, ok := err.(net.Error); ok && nErr.Temporary() {
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// Temporary error, just return
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return nil, nil, err
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}
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// Permanent error, need to reconnect
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if err := c.connectToServer(dialer); err != nil {
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// Still error, oops
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return nil, nil, err
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}
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// We are not going to try again even if it still fails the second time
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stream, err = c.quicSession.OpenStream()
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return c.quicSession, &wrappedQUICStream{stream}, err
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}
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func (c *Client) DialTCP(addr string, dialer transport.PacketDialer) (net.Conn, error) {
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host, port, err := utils.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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session, stream, err := c.openStreamWithReconnect(dialer)
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if err != nil {
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return nil, err
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}
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// Send request
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err = struc.Pack(stream, &clientRequest{
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UDP: false,
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Host: host,
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Port: port,
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})
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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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// Read response
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var sr serverResponse
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err = struc.Unpack(stream, &sr)
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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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if !sr.OK {
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_ = stream.Close()
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return nil, fmt.Errorf("connection rejected: %s", sr.Message)
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}
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return &quicConn{
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Orig: stream,
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PseudoLocalAddr: session.LocalAddr(),
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PseudoRemoteAddr: session.RemoteAddr(),
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}, nil
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}
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func (c *Client) DialUDP(dialer transport.PacketDialer) (UDPConn, error) {
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session, stream, err := c.openStreamWithReconnect(dialer)
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if err != nil {
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return nil, err
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}
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// Send request
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err = struc.Pack(stream, &clientRequest{
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UDP: true,
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})
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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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// Read response
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var sr serverResponse
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err = struc.Unpack(stream, &sr)
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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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if !sr.OK {
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_ = stream.Close()
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return nil, fmt.Errorf("connection rejected: %s", sr.Message)
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}
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// Create a session in the map
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c.udpSessionMutex.Lock()
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nCh := make(chan *udpMessage, 1024)
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// Store the current session map for CloseFunc below
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// to ensures that we are adding and removing sessions on the same map,
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// as reconnecting will reassign the map
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sessionMap := c.udpSessionMap
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sessionMap[sr.UDPSessionID] = nCh
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c.udpSessionMutex.Unlock()
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pktConn := &quicPktConn{
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Session: session,
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Stream: stream,
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CloseFunc: func() {
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c.udpSessionMutex.Lock()
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if ch, ok := sessionMap[sr.UDPSessionID]; ok {
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close(ch)
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delete(sessionMap, sr.UDPSessionID)
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}
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c.udpSessionMutex.Unlock()
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},
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UDPSessionID: sr.UDPSessionID,
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MsgCh: nCh,
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}
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go pktConn.Hold()
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return pktConn, nil
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}
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func (c *Client) Close() error {
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c.reconnectMutex.Lock()
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defer c.reconnectMutex.Unlock()
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err := c.quicSession.CloseWithError(closeErrorCodeGeneric, "")
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c.closed = true
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return err
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}
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type quicConn struct {
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Orig quic.Stream
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PseudoLocalAddr net.Addr
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PseudoRemoteAddr net.Addr
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}
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func (w *quicConn) Read(b []byte) (n int, err error) {
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return w.Orig.Read(b)
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}
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func (w *quicConn) Write(b []byte) (n int, err error) {
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return w.Orig.Write(b)
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}
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func (w *quicConn) Close() error {
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return w.Orig.Close()
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}
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func (w *quicConn) LocalAddr() net.Addr {
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return w.PseudoLocalAddr
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}
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func (w *quicConn) RemoteAddr() net.Addr {
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return w.PseudoRemoteAddr
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}
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func (w *quicConn) SetDeadline(t time.Time) error {
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return w.Orig.SetDeadline(t)
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}
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func (w *quicConn) SetReadDeadline(t time.Time) error {
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return w.Orig.SetReadDeadline(t)
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}
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func (w *quicConn) SetWriteDeadline(t time.Time) error {
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return w.Orig.SetWriteDeadline(t)
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}
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type UDPConn interface {
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ReadFrom() ([]byte, string, error)
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WriteTo([]byte, string) error
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Close() error
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LocalAddr() net.Addr
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SetDeadline(t time.Time) error
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SetReadDeadline(t time.Time) error
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SetWriteDeadline(t time.Time) error
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}
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type quicPktConn struct {
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Session quic.Connection
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Stream quic.Stream
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CloseFunc func()
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UDPSessionID uint32
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MsgCh <-chan *udpMessage
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}
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func (c *quicPktConn) Hold() {
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// Hold the stream until it's closed
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buf := make([]byte, 1024)
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for {
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_, err := c.Stream.Read(buf)
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if err != nil {
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break
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}
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}
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_ = c.Close()
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}
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func (c *quicPktConn) ReadFrom() ([]byte, string, error) {
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msg := <-c.MsgCh
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if msg == nil {
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// Closed
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return nil, "", ErrClosed
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}
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return msg.Data, net.JoinHostPort(msg.Host, strconv.Itoa(int(msg.Port))), nil
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}
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func (c *quicPktConn) WriteTo(p []byte, addr string) error {
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host, port, err := utils.SplitHostPort(addr)
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if err != nil {
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return err
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}
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msg := udpMessage{
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SessionID: c.UDPSessionID,
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Host: host,
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Port: port,
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FragCount: 1,
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Data: p,
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}
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// try no frag first
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var msgBuf bytes.Buffer
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_ = struc.Pack(&msgBuf, &msg)
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err = c.Session.SendMessage(msgBuf.Bytes())
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if err != nil {
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if errSize, ok := err.(quic.ErrMessageToLarge); ok {
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// need to frag
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msg.MsgID = uint16(rand.Intn(0xFFFF)) + 1 // msgID must be > 0 when fragCount > 1
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fragMsgs := fragUDPMessage(msg, int(errSize))
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for _, fragMsg := range fragMsgs {
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msgBuf.Reset()
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_ = struc.Pack(&msgBuf, &fragMsg)
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err = c.Session.SendMessage(msgBuf.Bytes())
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if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
} else {
|
||
|
|
// some other error
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *quicPktConn) Close() error {
|
||
|
|
c.CloseFunc()
|
||
|
|
return c.Stream.Close()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *quicPktConn) LocalAddr() net.Addr {
|
||
|
|
return c.Session.LocalAddr()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *quicPktConn) SetDeadline(t time.Time) error {
|
||
|
|
return c.Stream.SetDeadline(t)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *quicPktConn) SetReadDeadline(t time.Time) error {
|
||
|
|
return c.Stream.SetReadDeadline(t)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *quicPktConn) SetWriteDeadline(t time.Time) error {
|
||
|
|
return c.Stream.SetWriteDeadline(t)
|
||
|
|
}
|