2015-09-08 07:18:55 -04:00
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package socks
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2015-09-07 08:49:40 -04:00
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import (
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2017-01-12 18:56:21 -05:00
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"context"
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2015-09-15 18:06:22 -04:00
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"io"
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2015-10-06 11:24:57 -04:00
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"time"
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2015-09-09 06:13:52 -04:00
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2018-01-10 06:22:37 -05:00
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"v2ray.com/core"
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2017-01-12 18:56:21 -05:00
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"v2ray.com/core/common"
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2016-12-09 07:17:34 -05:00
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/log"
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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/session"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/common/task"
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2018-10-13 09:15:49 -04:00
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"v2ray.com/core/features"
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"v2ray.com/core/features/policy"
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"v2ray.com/core/features/routing"
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2016-08-20 14:55:45 -04:00
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/udp"
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2018-04-16 18:31:10 -04:00
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"v2ray.com/core/transport/pipe"
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2015-09-09 06:13:52 -04:00
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)
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2016-04-25 18:33:16 -04:00
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// Server is a SOCKS 5 proxy server
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type Server struct {
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config *ServerConfig
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policyManager policy.Manager
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}
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// NewServer creates a new Server object.
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func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
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v := core.MustFromContext(ctx)
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s := &Server{
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config: config,
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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}
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return s, nil
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}
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2018-10-11 16:34:31 -04:00
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func (s *Server) policy() policy.Session {
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config := s.config
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p := s.policyManager.ForLevel(config.UserLevel)
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if config.Timeout > 0 {
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features.PrintDeprecatedFeatureWarning("Socks timeout")
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}
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if config.Timeout > 0 && config.UserLevel == 0 {
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p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
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}
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return p
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}
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2018-02-23 11:14:20 -05:00
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// Network implements proxy.Inbound.
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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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// Process implements proxy.Inbound.
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func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.Dispatcher) error {
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switch network {
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case net.Network_TCP:
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return s.processTCP(ctx, conn, dispatcher)
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case net.Network_UDP:
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return s.handleUDPPayload(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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2018-10-11 14:43:37 -04:00
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func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
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plcy := s.policy()
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if err := conn.SetReadDeadline(time.Now().Add(plcy.Timeouts.Handshake)); err != nil {
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newError("failed to set deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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2018-09-18 17:09:54 -04:00
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inbound := session.InboundFromContext(ctx)
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if inbound == nil || !inbound.Gateway.IsValid() {
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return newError("inbound gateway not specified")
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}
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2018-06-24 19:09:02 -04:00
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svrSession := &ServerSession{
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config: s.config,
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port: inbound.Gateway.Port,
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}
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2018-08-17 14:54:25 -04:00
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reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
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request, err := svrSession.Handshake(reader, conn)
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if err != nil {
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if inbound != nil && inbound.Source.IsValid() {
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log.Record(&log.AccessMessage{
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From: inbound.Source,
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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}
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return newError("failed to read request").Base(err)
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}
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if err := conn.SetReadDeadline(time.Time{}); err != nil {
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newError("failed to clear deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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2017-01-07 15:57:24 -05:00
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if request.Command == protocol.RequestCommandTCP {
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dest := request.Destination()
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newError("TCP Connect request to ", dest).WriteToLog(session.ExportIDToError(ctx))
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if inbound != nil && inbound.Source.IsValid() {
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log.Record(&log.AccessMessage{
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From: inbound.Source,
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To: dest,
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Status: log.AccessAccepted,
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Reason: "",
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})
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}
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2017-02-03 16:35:09 -05:00
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return s.transport(ctx, reader, conn, dest, dispatcher)
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}
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2017-01-07 15:57:24 -05:00
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if request.Command == protocol.RequestCommandUDP {
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2017-11-04 15:50:17 -04:00
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return s.handleUDP(conn)
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2016-08-14 11:08:01 -04:00
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}
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return nil
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2015-10-03 15:42:03 -04:00
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}
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2018-02-23 11:14:20 -05:00
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func (*Server) handleUDP(c io.Reader) error {
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// The TCP connection closes after this method returns. We need to wait until
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// the client closes it.
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return common.Error2(io.Copy(buf.DiscardBytes, c))
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}
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2018-10-11 14:43:37 -04:00
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func (s *Server) transport(ctx context.Context, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher routing.Dispatcher) error {
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ctx, cancel := context.WithCancel(ctx)
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2018-02-23 11:14:20 -05:00
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timer := signal.CancelAfterInactivity(ctx, cancel, s.policy().Timeouts.ConnectionIdle)
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2017-01-31 06:42:05 -05:00
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2018-05-25 06:08:28 -04:00
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plcy := s.policy()
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ctx = policy.ContextWithBufferPolicy(ctx, plcy.Buffer)
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link, 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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2018-04-11 10:45:09 -04:00
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requestDone := func() error {
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2018-05-25 06:08:28 -04:00
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defer timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
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2018-07-31 10:05:57 -04:00
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if err := buf.Copy(buf.NewReader(reader), link.Writer, buf.UpdateActivity(timer)); err != nil {
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2017-04-08 19:43:25 -04:00
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return newError("failed to transport all TCP request").Base(err)
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2016-12-29 18:32:20 -05:00
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}
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2018-02-23 11:07:45 -05:00
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2016-12-29 18:32:20 -05:00
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return nil
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}
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2016-12-29 18:32:20 -05:00
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2018-04-11 10:45:09 -04:00
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responseDone := func() error {
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defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
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2018-02-23 11:07:45 -05:00
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2016-12-29 18:32:20 -05:00
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v2writer := buf.NewWriter(writer)
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2018-04-16 18:31:10 -04:00
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if err := buf.Copy(link.Reader, v2writer, buf.UpdateActivity(timer)); err != nil {
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2017-04-08 19:43:25 -04:00
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return newError("failed to transport all TCP response").Base(err)
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2016-11-21 18:17:49 -05:00
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}
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2018-02-23 11:07:45 -05:00
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2016-12-29 18:32:20 -05:00
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return nil
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2018-04-11 10:45:09 -04:00
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}
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2016-04-18 13:01:24 -04:00
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2018-05-27 07:02:29 -04:00
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var requestDonePost = task.Single(requestDone, task.OnSuccess(task.Close(link.Writer)))
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if err := task.Run(task.WithContext(ctx), task.Parallel(requestDonePost, responseDone))(); err != nil {
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2018-04-16 18:31:10 -04:00
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pipe.CloseError(link.Reader)
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pipe.CloseError(link.Writer)
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2017-04-08 19:43:25 -04:00
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return newError("connection ends").Base(err)
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2017-01-26 14:46:44 -05:00
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}
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return nil
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}
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2018-10-11 14:43:37 -04:00
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func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
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2018-07-03 15:38:02 -04:00
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udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, payload *buf.Buffer) {
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newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
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request := protocol.RequestHeaderFromContext(ctx)
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if request == nil {
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return
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}
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udpMessage, err := EncodeUDPPacket(request, payload.Bytes())
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payload.Release()
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defer udpMessage.Release()
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if err != nil {
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newError("failed to write UDP response").AtWarning().Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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conn.Write(udpMessage.Bytes()) // nolint: errcheck
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})
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2017-02-03 16:35:09 -05:00
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2018-09-18 17:09:54 -04:00
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
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newError("client UDP connection from ", inbound.Source).WriteToLog(session.ExportIDToError(ctx))
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2017-02-09 16:49:38 -05:00
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}
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2017-01-26 14:46:44 -05:00
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reader := buf.NewReader(conn)
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for {
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2017-11-09 16:33:15 -05:00
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mpayload, err := reader.ReadMultiBuffer()
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2017-01-26 14:46:44 -05:00
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if err != nil {
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return err
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}
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2017-04-15 15:07:23 -04:00
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for _, payload := range mpayload {
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2018-02-23 17:42:01 -05:00
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request, err := DecodeUDPPacket(payload)
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2017-01-26 14:46:44 -05:00
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2017-04-15 15:07:23 -04:00
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if err != nil {
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2018-06-24 19:09:02 -04:00
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newError("failed to parse UDP request").Base(err).WriteToLog(session.ExportIDToError(ctx))
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2018-02-23 17:42:01 -05:00
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payload.Release()
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2017-04-15 15:07:23 -04:00
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continue
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}
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2017-01-26 14:46:44 -05:00
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2018-02-23 17:42:01 -05:00
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if payload.IsEmpty() {
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payload.Release()
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2017-04-15 15:07:23 -04:00
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continue
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}
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2018-06-24 19:09:02 -04:00
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newError("send packet to ", request.Destination(), " with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
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2018-09-18 17:09:54 -04:00
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
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2017-12-19 15:28:12 -05:00
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log.Record(&log.AccessMessage{
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2018-09-18 17:09:54 -04:00
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From: inbound.Source,
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2018-05-25 19:55:50 -04:00
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To: request.Destination(),
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2017-12-19 15:28:12 -05:00
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Status: log.AccessAccepted,
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Reason: "",
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})
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2017-04-15 15:07:23 -04:00
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}
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2017-01-26 14:46:44 -05:00
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2018-07-03 15:38:02 -04:00
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ctx = protocol.ContextWithRequestHeader(ctx, request)
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udpServer.Dispatch(ctx, request.Destination(), payload)
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2017-04-15 15:07:23 -04:00
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}
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2016-11-21 18:17:49 -05:00
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}
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2015-09-10 18:24:18 -04:00
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}
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2016-04-25 18:35:42 -04:00
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2017-01-12 18:56:21 -05:00
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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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2016-06-14 16:54:08 -04:00
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}
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