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100 lines
2.6 KiB
100 lines
2.6 KiB
package kcp
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import (
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"context"
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"io"
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"sync/atomic"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/dice"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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"github.com/xtls/xray-core/transport/internet/xtls"
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)
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var globalConv = uint32(dice.RollUint16())
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func fetchInput(_ context.Context, input io.Reader, reader PacketReader, conn *Connection) {
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cache := make(chan *buf.Buffer, 1024)
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go func() {
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for {
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payload := buf.New()
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if _, err := payload.ReadFrom(input); err != nil {
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payload.Release()
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close(cache)
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return
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}
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select {
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case cache <- payload:
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default:
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payload.Release()
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}
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}
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}()
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for payload := range cache {
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segments := reader.Read(payload.Bytes())
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payload.Release()
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if len(segments) > 0 {
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conn.Input(segments)
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}
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}
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}
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// DialKCP dials a new KCP connections to the specific destination.
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func DialKCP(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
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dest.Network = net.Network_UDP
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newError("dialing mKCP to ", dest).WriteToLog()
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rawConn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
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if err != nil {
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return nil, newError("failed to dial to dest: ", err).AtWarning().Base(err)
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}
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kcpSettings := streamSettings.ProtocolSettings.(*Config)
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header, err := kcpSettings.GetPackerHeader()
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if err != nil {
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return nil, newError("failed to create packet header").Base(err)
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}
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security, err := kcpSettings.GetSecurity()
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if err != nil {
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return nil, newError("failed to create security").Base(err)
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}
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reader := &KCPPacketReader{
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Header: header,
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Security: security,
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}
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writer := &KCPPacketWriter{
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Header: header,
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Security: security,
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Writer: rawConn,
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}
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conv := uint16(atomic.AddUint32(&globalConv, 1))
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session := NewConnection(ConnMetadata{
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LocalAddr: rawConn.LocalAddr(),
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RemoteAddr: rawConn.RemoteAddr(),
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Conversation: conv,
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}, writer, rawConn, kcpSettings)
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go fetchInput(ctx, rawConn, reader, session)
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var iConn stat.Connection = session
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if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
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iConn = tls.Client(iConn, config.GetTLSConfig(tls.WithDestination(dest)))
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} else if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
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iConn = xtls.Client(iConn, config.GetXTLSConfig(xtls.WithDestination(dest)))
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}
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return iConn, nil
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}
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func init() {
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common.Must(internet.RegisterTransportDialer(protocolName, DialKCP))
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}
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