package mux import ( "io" "net" "github.com/sagernet/sing/common" "github.com/sagernet/sing/common/buf" "github.com/sagernet/sing/common/bufio" "github.com/sagernet/smux" ) type abstractSession interface { Open() (net.Conn, error) Accept() (net.Conn, error) NumStreams() int Close() error IsClosed() bool } var _ abstractSession = (*smuxSession)(nil) type smuxSession struct { *smux.Session } func (s *smuxSession) Open() (net.Conn, error) { return s.OpenStream() } func (s *smuxSession) Accept() (net.Conn, error) { return s.AcceptStream() } type protocolConn struct { net.Conn protocol Protocol protocolWritten bool } func (c *protocolConn) Write(p []byte) (n int, err error) { if c.protocolWritten { return c.Conn.Write(p) } _buffer := buf.StackNewSize(2 + len(p)) defer common.KeepAlive(_buffer) buffer := common.Dup(_buffer) defer buffer.Release() EncodeRequest(buffer, Request{ Protocol: c.protocol, }) common.Must(common.Error(buffer.Write(p))) n, err = c.Conn.Write(buffer.Bytes()) if err == nil { n-- } c.protocolWritten = true return n, err } func (c *protocolConn) ReadFrom(r io.Reader) (n int64, err error) { if !c.protocolWritten { return bufio.ReadFrom0(c, r) } return bufio.Copy(c.Conn, r) } func (c *protocolConn) Upstream() any { return c.Conn }