mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-08-30 16:24:37 -04:00
222 lines
5.7 KiB
Go
222 lines
5.7 KiB
Go
package socks
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import (
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"context"
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"io"
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"time"
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"v2ray.com/core"
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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/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/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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// Server is a SOCKS 5 proxy server
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type Server struct {
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config *ServerConfig
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v *core.Instance
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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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s := &Server{
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config: config,
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v: core.MustFromContext(ctx),
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}
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return s, nil
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}
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func (s *Server) policy() core.Policy {
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config := s.config
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p := s.v.PolicyManager().ForLevel(config.UserLevel)
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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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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 core.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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func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispatcher core.Dispatcher) error {
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conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake))
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reader := buf.NewBufferedReader(buf.NewReader(conn))
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inboundDest, ok := proxy.InboundEntryPointFromContext(ctx)
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if !ok {
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return newError("inbound entry point not specified")
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}
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session := &ServerSession{
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config: s.config,
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port: inboundDest.Port,
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}
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request, err := session.Handshake(reader, conn)
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if err != nil {
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if source, ok := proxy.SourceFromContext(ctx); ok {
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log.Record(&log.AccessMessage{
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From: 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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conn.SetReadDeadline(time.Time{})
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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()
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if source, ok := proxy.SourceFromContext(ctx); ok {
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log.Record(&log.AccessMessage{
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From: 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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return s.transport(ctx, reader, conn, dest, dispatcher)
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}
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if request.Command == protocol.RequestCommandUDP {
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return s.handleUDP(conn)
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}
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return nil
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}
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func (*Server) handleUDP(c net.Conn) 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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_, err := io.Copy(buf.DiscardBytes, c)
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return err
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}
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func (v *Server) transport(ctx context.Context, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher core.Dispatcher) error {
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, v.policy().Timeouts.ConnectionIdle)
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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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input := ray.InboundInput()
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output := ray.InboundOutput()
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requestDone := signal.ExecuteAsync(func() error {
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defer input.Close()
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v2reader := buf.NewReader(reader)
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if err := buf.Copy(v2reader, input, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transport all TCP request").Base(err)
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}
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timer.SetTimeout(v.policy().Timeouts.DownlinkOnly)
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return nil
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})
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responseDone := signal.ExecuteAsync(func() error {
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v2writer := buf.NewWriter(writer)
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if err := buf.Copy(output, v2writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transport all TCP response").Base(err)
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}
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timer.SetTimeout(v.policy().Timeouts.UplinkOnly)
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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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input.CloseError()
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output.CloseError()
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return newError("connection ends").Base(err)
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}
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return nil
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}
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func (v *Server) handleUDPPayload(ctx context.Context, conn internet.Connection, dispatcher core.Dispatcher) error {
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udpServer := udp.NewDispatcher(dispatcher)
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if source, ok := proxy.SourceFromContext(ctx); ok {
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newError("client UDP connection from ", source).WriteToLog()
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}
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reader := buf.NewReader(conn)
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for {
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mpayload, err := reader.ReadMultiBuffer()
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if err != nil {
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return err
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}
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for _, payload := range mpayload {
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request, data, err := DecodeUDPPacket(payload.Bytes())
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if err != nil {
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newError("failed to parse UDP request").Base(err).WriteToLog()
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continue
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}
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if len(data) == 0 {
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continue
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}
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newError("send packet to ", request.Destination(), " with ", len(data), " bytes").AtDebug().WriteToLog()
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if source, ok := proxy.SourceFromContext(ctx); ok {
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log.Record(&log.AccessMessage{
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From: source,
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To: request.Destination,
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Status: log.AccessAccepted,
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Reason: "",
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})
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}
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dataBuf := buf.New()
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dataBuf.Append(data)
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udpServer.Dispatch(ctx, request.Destination(), dataBuf, func(payload *buf.Buffer) {
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defer payload.Release()
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newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug().WriteToLog()
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udpMessage, err := EncodeUDPPacket(request, payload.Bytes())
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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()
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}
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conn.Write(udpMessage.Bytes())
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})
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}
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}
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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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