mirror of https://github.com/v2ray/v2ray-core
208 lines
5.5 KiB
Go
208 lines
5.5 KiB
Go
package shadowsocks
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import (
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"context"
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"runtime"
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"time"
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"v2ray.com/core/app"
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"v2ray.com/core/app/dispatcher"
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"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/udp"
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)
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type Server struct {
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config *ServerConfig
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user *protocol.User
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account *ShadowsocksAccount
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}
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// NewServer create a new Shadowsocks server.
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func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
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space := app.SpaceFromContext(ctx)
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if space == nil {
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return nil, newError("no space in context")
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}
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if config.GetUser() == nil {
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return nil, newError("user is not specified")
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}
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rawAccount, err := config.User.GetTypedAccount()
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if err != nil {
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return nil, newError("failed to get user account").Base(err)
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}
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account := rawAccount.(*ShadowsocksAccount)
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s := &Server{
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config: config,
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user: config.GetUser(),
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account: account,
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}
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return s, nil
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}
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func (s *Server) Network() net.NetworkList {
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list := net.NetworkList{
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Network: []net.Network{net.Network_TCP},
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}
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if s.config.UdpEnabled {
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list.Network = append(list.Network, net.Network_UDP)
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}
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return list
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}
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func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
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switch network {
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case net.Network_TCP:
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return s.handleConnection(ctx, conn, dispatcher)
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case net.Network_UDP:
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return s.handlerUDPPayload(ctx, conn, dispatcher)
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default:
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return newError("unknown network: ", network)
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}
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}
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func (v *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher dispatcher.Interface) error {
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udpServer := udp.NewDispatcher(dispatcher)
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reader := buf.NewReader(conn)
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for {
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mpayload, err := reader.Read()
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if err != nil {
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break
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}
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for _, payload := range mpayload {
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request, data, err := DecodeUDPPacket(v.user, payload)
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if err != nil {
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if source, ok := proxy.SourceFromContext(ctx); ok {
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log.Trace(newError("dropping invalid UDP packet from: ", source).Base(err))
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log.Access(source, "", log.AccessRejected, err)
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}
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payload.Release()
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continue
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}
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if request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Disabled {
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log.Trace(newError("client payload enables OTA but server doesn't allow it"))
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payload.Release()
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continue
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}
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if !request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Enabled {
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log.Trace(newError("client payload disables OTA but server forces it"))
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payload.Release()
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continue
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}
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dest := request.Destination()
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if source, ok := proxy.SourceFromContext(ctx); ok {
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log.Access(source, dest, log.AccessAccepted, "")
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}
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log.Trace(newError("tunnelling request to ", dest))
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ctx = protocol.ContextWithUser(ctx, request.User)
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udpServer.Dispatch(ctx, dest, data, func(payload *buf.Buffer) {
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defer payload.Release()
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data, err := EncodeUDPPacket(request, payload.Bytes())
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if err != nil {
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log.Trace(newError("failed to encode UDP packet").Base(err).AtWarning())
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return
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}
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defer data.Release()
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conn.Write(data.Bytes())
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})
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}
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}
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return nil
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}
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func (s *Server) handleConnection(ctx context.Context, conn internet.Connection, dispatcher dispatcher.Interface) error {
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conn.SetReadDeadline(time.Now().Add(time.Second * 8))
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bufferedReader := buf.NewBufferedReader(conn)
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request, bodyReader, err := ReadTCPSession(s.user, bufferedReader)
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if err != nil {
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log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
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return newError("failed to create request from: ", conn.RemoteAddr()).Base(err)
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}
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conn.SetReadDeadline(time.Time{})
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bufferedReader.SetBuffered(false)
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dest := request.Destination()
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log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
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log.Trace(newError("tunnelling request to ", dest))
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ctx = protocol.ContextWithUser(ctx, request.User)
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userSettings := s.user.GetSettings()
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ctx, timer := signal.CancelAfterInactivity(ctx, userSettings.PayloadTimeout)
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ray, err := dispatcher.Dispatch(ctx, dest)
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if err != nil {
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return err
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}
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responseDone := signal.ExecuteAsync(func() error {
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bufferedWriter := buf.NewBufferedWriter(conn)
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responseWriter, err := WriteTCPResponse(request, bufferedWriter)
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if err != nil {
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return newError("failed to write response").Base(err)
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}
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payload, err := ray.InboundOutput().Read()
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if err != nil {
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return err
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}
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if err := responseWriter.Write(payload); err != nil {
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return err
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}
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payload.Release()
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if err := bufferedWriter.SetBuffered(false); err != nil {
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return err
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}
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if err := buf.Copy(timer, ray.InboundOutput(), responseWriter); err != nil {
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return newError("failed to transport all TCP response").Base(err)
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}
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return nil
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})
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requestDone := signal.ExecuteAsync(func() error {
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defer ray.InboundInput().Close()
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if err := buf.Copy(timer, bodyReader, ray.InboundInput()); err != nil {
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return newError("failed to transport all TCP request").Base(err)
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}
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return nil
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})
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if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
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ray.InboundInput().CloseError()
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ray.InboundOutput().CloseError()
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return newError("connection ends").Base(err)
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}
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runtime.KeepAlive(timer)
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return nil
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}
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func init() {
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common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewServer(ctx, config.(*ServerConfig))
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}))
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}
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