67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package trojan
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import (
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"context"
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"net"
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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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"github.com/sagernet/sing/common/rw"
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"github.com/sagernet/sing/common/task"
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"github.com/sagernet/smux"
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)
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func HandleMuxConnection(ctx context.Context, conn net.Conn, metadata M.Metadata, handler Handler) error {
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session, err := smux.Server(conn, smuxConfig())
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if err != nil {
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return err
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}
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var group task.Group
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group.Append0(func(_ context.Context) error {
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var stream net.Conn
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for {
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stream, err = session.AcceptStream()
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if err != nil {
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return err
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}
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go newMuxConnection(ctx, stream, metadata, handler)
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}
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})
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group.Cleanup(func() {
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session.Close()
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})
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return group.Run(ctx)
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}
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func newMuxConnection(ctx context.Context, stream net.Conn, metadata M.Metadata, handler Handler) {
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err := newMuxConnection0(ctx, stream, metadata, handler)
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if err != nil {
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handler.NewError(ctx, E.Cause(err, "process trojan-go multiplex connection"))
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}
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}
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func newMuxConnection0(ctx context.Context, stream net.Conn, metadata M.Metadata, handler Handler) error {
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command, err := rw.ReadByte(stream)
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if err != nil {
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return E.Cause(err, "read command")
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}
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metadata.Destination, err = M.SocksaddrSerializer.ReadAddrPort(stream)
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if err != nil {
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return E.Cause(err, "read destination")
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}
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switch command {
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case CommandTCP:
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return handler.NewConnection(ctx, stream, metadata)
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case CommandUDP:
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return handler.NewPacketConnection(ctx, &PacketConn{Conn: stream}, metadata)
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default:
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return E.New("unknown command ", command)
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}
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}
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func smuxConfig() *smux.Config {
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config := smux.DefaultConfig()
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config.KeepAliveDisabled = true
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return config
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}
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