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v2fly/proxy/shadowsocks/server.go

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package shadowsocks
import (
"context"
"time"
core "github.com/v2fly/v2ray-core/v5"
"github.com/v2fly/v2ray-core/v5/common"
"github.com/v2fly/v2ray-core/v5/common/buf"
"github.com/v2fly/v2ray-core/v5/common/log"
"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
"github.com/v2fly/v2ray-core/v5/common/protocol"
udp_proto "github.com/v2fly/v2ray-core/v5/common/protocol/udp"
"github.com/v2fly/v2ray-core/v5/common/session"
"github.com/v2fly/v2ray-core/v5/common/signal"
"github.com/v2fly/v2ray-core/v5/common/task"
"github.com/v2fly/v2ray-core/v5/features/policy"
"github.com/v2fly/v2ray-core/v5/features/routing"
"github.com/v2fly/v2ray-core/v5/transport/internet"
"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
policyManager policy.Manager
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}
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// NewServer create a new Shadowsocks server.
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,
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
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return s, nil
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}
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func (s *Server) Network() []net.Network {
list := s.config.Network
if len(list) == 0 {
list = append(list, net.Network_TCP)
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}
if s.config.UdpEnabled {
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list = append(list, net.Network_UDP)
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}
return list
}
func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.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:
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return newError("unknown network: ", network)
}
}
func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
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udpDispatcherConstructor := udp.NewSplitDispatcher
switch s.config.PacketEncoding {
case packetaddr.PacketAddrType_None:
break
case packetaddr.PacketAddrType_Packet:
packetAddrDispatcherFactory := udp.NewPacketAddrDispatcherCreator(ctx)
udpDispatcherConstructor = packetAddrDispatcherFactory.NewPacketAddrDispatcher
}
udpServer := udpDispatcherConstructor(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
request := protocol.RequestHeaderFromContext(ctx)
if request == nil {
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request = &protocol.RequestHeader{
Port: packet.Source.Port,
Address: packet.Source.Address,
User: s.user,
}
}
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payload := packet.Payload
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())
})
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inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
inbound.User = s.user
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reader := buf.NewPacketReader(conn)
for {
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mpayload, err := reader.ReadMultiBuffer()
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if err != nil {
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 {
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
newError("dropping invalid UDP packet from: ", inbound.Source).Base(err).WriteToLog(session.ExportIDToError(ctx))
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log.Record(&log.AccessMessage{
From: inbound.Source,
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To: "",
Status: log.AccessRejected,
Reason: err,
})
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}
payload.Release()
continue
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}
currentPacketCtx := ctx
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dest := request.Destination()
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if inbound.Source.IsValid() {
currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: inbound.Source,
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To: dest,
Status: log.AccessAccepted,
Reason: "",
Email: request.User.Email,
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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)
udpServer.Dispatch(currentPacketCtx, dest, data)
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}
}
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return nil
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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)
conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake))
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{
From: conn.RemoteAddr(),
To: "",
Status: log.AccessRejected,
Reason: 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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inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
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(),
To: dest,
Status: log.AccessAccepted,
Reason: "",
Email: request.User.Email,
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})
newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
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ctx, cancel := context.WithCancel(ctx)
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)
if err != nil {
return err
}
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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)
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 {
return err
}
if err := responseWriter.WriteMultiBuffer(payload); err != nil {
return err
}
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}
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
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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)
common.Interrupt(link.Writer)
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return newError("connection ends").Base(err)
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}
return nil
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}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
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}