package shadowsocks import ( "context" "time" "v2ray.com/core/common/session" "v2ray.com/core/common/task" "v2ray.com/core" "v2ray.com/core/common" "v2ray.com/core/common/buf" "v2ray.com/core/common/log" "v2ray.com/core/common/net" "v2ray.com/core/common/protocol" "v2ray.com/core/common/signal" "v2ray.com/core/proxy" "v2ray.com/core/transport/internet" "v2ray.com/core/transport/internet/udp" "v2ray.com/core/transport/pipe" ) type Server struct { config ServerConfig user *protocol.User account *MemoryAccount v *core.Instance } // NewServer create a new Shadowsocks server. func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) { if config.GetUser() == nil { return nil, newError("user is not specified") } rawAccount, err := config.User.GetTypedAccount() if err != nil { return nil, newError("failed to get user account").Base(err) } account := rawAccount.(*MemoryAccount) s := &Server{ config: *config, user: config.GetUser(), account: account, v: core.MustFromContext(ctx), } return s, nil } func (s *Server) Network() net.NetworkList { list := net.NetworkList{ Network: s.config.Network, } if len(list.Network) == 0 { list.Network = append(list.Network, net.Network_TCP) } if s.config.UdpEnabled { list.Network = append(list.Network, net.Network_UDP) } return list } func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error { switch network { case net.Network_TCP: return s.handleConnection(ctx, conn, dispatcher) case net.Network_UDP: return s.handlerUDPPayload(ctx, conn, dispatcher) default: return newError("unknown network: ", network) } } func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher core.Dispatcher) error { udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, payload *buf.Buffer) { request := protocol.RequestHeaderFromContext(ctx) if request == nil { return } data, err := EncodeUDPPacket(request, payload.Bytes()) payload.Release() if err != nil { newError("failed to encode UDP packet").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx)) return } defer data.Release() conn.Write(data.Bytes()) }) reader := buf.NewReader(conn) for { mpayload, err := reader.ReadMultiBuffer() if err != nil { break } for _, payload := range mpayload { request, data, err := DecodeUDPPacket(s.user, payload) if err != nil { if source, ok := proxy.SourceFromContext(ctx); ok { newError("dropping invalid UDP packet from: ", source).Base(err).WriteToLog(session.ExportIDToError(ctx)) log.Record(&log.AccessMessage{ From: source, To: "", Status: log.AccessRejected, Reason: err, }) } payload.Release() continue } if request.Option.Has(RequestOptionOneTimeAuth) && s.account.OneTimeAuth == Account_Disabled { newError("client payload enables OTA but server doesn't allow it").WriteToLog(session.ExportIDToError(ctx)) payload.Release() continue } if !request.Option.Has(RequestOptionOneTimeAuth) && s.account.OneTimeAuth == Account_Enabled { newError("client payload disables OTA but server forces it").WriteToLog(session.ExportIDToError(ctx)) payload.Release() continue } dest := request.Destination() if source, ok := proxy.SourceFromContext(ctx); ok { log.Record(&log.AccessMessage{ From: source, To: dest, Status: log.AccessAccepted, Reason: "", }) } newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx)) ctx = protocol.ContextWithUser(ctx, request.User) ctx = protocol.ContextWithRequestHeader(ctx, request) udpServer.Dispatch(ctx, dest, data) } } return nil } func (s *Server) handleConnection(ctx context.Context, conn internet.Connection, dispatcher core.Dispatcher) error { sessionPolicy := s.v.PolicyManager().ForLevel(s.user.Level) conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)) bufferedReader := buf.BufferedReader{Reader: buf.NewReader(conn)} request, bodyReader, err := ReadTCPSession(s.user, &bufferedReader) if err != nil { log.Record(&log.AccessMessage{ From: conn.RemoteAddr(), To: "", Status: log.AccessRejected, Reason: err, }) return newError("failed to create request from: ", conn.RemoteAddr()).Base(err) } conn.SetReadDeadline(time.Time{}) bufferedReader.Direct = true dest := request.Destination() log.Record(&log.AccessMessage{ From: conn.RemoteAddr(), To: dest, Status: log.AccessAccepted, Reason: "", }) newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx)) ctx = protocol.ContextWithUser(ctx, request.User) ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle) ctx = core.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer) link, err := dispatcher.Dispatch(ctx, dest) if err != nil { return err } responseDone := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly) bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(conn)) responseWriter, err := WriteTCPResponse(request, bufferedWriter) if err != nil { return newError("failed to write response").Base(err) } { payload, err := link.Reader.ReadMultiBuffer() if err != nil { return err } if err := responseWriter.WriteMultiBuffer(payload); err != nil { return err } } if err := bufferedWriter.SetBuffered(false); err != nil { return err } if err := buf.Copy(link.Reader, responseWriter, buf.UpdateActivity(timer)); err != nil { return newError("failed to transport all TCP response").Base(err) } return nil } requestDone := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly) if err := buf.Copy(bodyReader, link.Writer, buf.UpdateActivity(timer)); err != nil { return newError("failed to transport all TCP request").Base(err) } return nil } var requestDoneAndCloseWriter = task.Single(requestDone, task.OnSuccess(task.Close(link.Writer))) if err := task.Run(task.WithContext(ctx), task.Parallel(requestDoneAndCloseWriter, responseDone))(); err != nil { pipe.CloseError(link.Reader) pipe.CloseError(link.Writer) return newError("connection ends").Base(err) } return nil } func init() { common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return NewServer(ctx, config.(*ServerConfig)) })) }