mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-10-04 09:46:14 -04:00
252 lines
7.1 KiB
Go
252 lines
7.1 KiB
Go
package shadowsocks
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import (
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"context"
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"time"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/log"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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udp_proto "github.com/v2fly/v2ray-core/v5/common/protocol/udp"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/features/routing"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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"github.com/v2fly/v2ray-core/v5/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.MemoryUser
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policyManager policy.Manager
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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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if config.GetUser() == nil {
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return nil, newError("user is not specified")
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}
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mUser, err := config.User.ToMemoryUser()
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if err != nil {
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return nil, newError("failed to parse user account").Base(err)
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}
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v := core.MustFromContext(ctx)
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s := &Server{
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config: config,
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user: mUser,
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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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func (s *Server) Network() []net.Network {
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list := s.config.Network
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if len(list) == 0 {
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list = append(list, net.Network_TCP)
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}
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if s.config.UdpEnabled {
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list = append(list, 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 routing.Dispatcher) 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 (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
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udpDispatcherConstructor := udp.NewSplitDispatcher
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switch s.config.PacketEncoding {
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case packetaddr.PacketAddrType_None:
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break
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case packetaddr.PacketAddrType_Packet:
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packetAddrDispatcherFactory := udp.NewPacketAddrDispatcherCreator(ctx)
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udpDispatcherConstructor = packetAddrDispatcherFactory.NewPacketAddrDispatcher
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}
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udpServer := udpDispatcherConstructor(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
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request := protocol.RequestHeaderFromContext(ctx)
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if request == nil {
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request = &protocol.RequestHeader{
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Port: packet.Source.Port,
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Address: packet.Source.Address,
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User: s.user,
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}
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}
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payload := packet.Payload
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data, err := EncodeUDPPacket(request, payload.Bytes())
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payload.Release()
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if err != nil {
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newError("failed to encode UDP packet").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
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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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inbound := session.InboundFromContext(ctx)
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if inbound == nil {
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panic("no inbound metadata")
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}
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inbound.User = s.user
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reader := buf.NewPacketReader(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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break
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}
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for _, payload := range mpayload {
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request, data, err := DecodeUDPPacket(s.user, payload)
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if err != nil {
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
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newError("dropping invalid UDP packet from: ", inbound.Source).Base(err).WriteToLog(session.ExportIDToError(ctx))
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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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payload.Release()
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continue
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}
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currentPacketCtx := ctx
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dest := request.Destination()
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if inbound.Source.IsValid() {
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currentPacketCtx = log.ContextWithAccessMessage(ctx, &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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Email: request.User.Email,
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})
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}
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newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(currentPacketCtx))
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currentPacketCtx = protocol.ContextWithRequestHeader(currentPacketCtx, request)
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udpServer.Dispatch(currentPacketCtx, dest, data)
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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 routing.Dispatcher) error {
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sessionPolicy := s.policyManager.ForLevel(s.user.Level)
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conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake))
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bufferedReader := buf.BufferedReader{Reader: buf.NewReader(conn)}
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request, bodyReader, err := ReadTCPSession(s.user, &bufferedReader)
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if err != nil {
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log.Record(&log.AccessMessage{
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From: conn.RemoteAddr(),
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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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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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inbound := session.InboundFromContext(ctx)
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if inbound == nil {
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panic("no inbound metadata")
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}
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inbound.User = s.user
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dest := request.Destination()
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ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
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From: conn.RemoteAddr(),
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To: dest,
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Status: log.AccessAccepted,
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Reason: "",
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Email: request.User.Email,
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})
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newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.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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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(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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{
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payload, err := link.Reader.ReadMultiBuffer()
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if err != nil {
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return err
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}
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if err := responseWriter.WriteMultiBuffer(payload); err != nil {
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return err
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}
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}
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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(link.Reader, responseWriter, 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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return nil
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}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if err := buf.Copy(bodyReader, link.Writer, 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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return nil
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}
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requestDoneAndCloseWriter := task.OnSuccess(requestDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDoneAndCloseWriter, responseDone); err != nil {
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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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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 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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