Xray-core/proxy/shadowsocks/server.go
2021-02-12 15:17:31 +00:00

288 lines
7.7 KiB
Go

package shadowsocks
import (
"context"
"time"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
udp_proto "github.com/xtls/xray-core/common/protocol/udp"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/udp"
)
type Server struct {
config *ServerConfig
validator *Validator
policyManager policy.Manager
cone bool
}
// NewServer create a new Shadowsocks server.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
validator := new(Validator)
for _, user := range config.Users {
u, err := user.ToMemoryUser()
if err != nil {
return nil, newError("failed to get shadowsocks user").Base(err).AtError()
}
if err := validator.Add(u); err != nil {
return nil, newError("failed to add user").Base(err).AtError()
}
}
v := core.MustFromContext(ctx)
s := &Server{
config: config,
validator: validator,
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
cone: ctx.Value("cone").(bool),
}
return s, nil
}
// AddUser implements proxy.UserManager.AddUser().
func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
return s.validator.Add(u)
}
// RemoveUser implements proxy.UserManager.RemoveUser().
func (s *Server) RemoveUser(ctx context.Context, e string) error {
return s.validator.Del(e)
}
func (s *Server) Network() []net.Network {
list := s.config.Network
if len(list) == 0 {
list = append(list, net.Network_TCP)
}
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.handleUDPPayload(ctx, conn, dispatcher)
default:
return newError("unknown network: ", network)
}
}
func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
request := protocol.RequestHeaderFromContext(ctx)
if request == nil {
return
}
payload := packet.Payload
if payload.UDP != nil {
request = &protocol.RequestHeader{
User: request.User,
Address: payload.UDP.Address,
Port: payload.UDP.Port,
}
}
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())
})
inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
if s.validator.Count() == 1 {
inbound.User, _ = s.validator.GetOnlyUser()
}
var dest *net.Destination
reader := buf.NewPacketReader(conn)
for {
mpayload, err := reader.ReadMultiBuffer()
if err != nil {
break
}
for _, payload := range mpayload {
var request *protocol.RequestHeader
var data *buf.Buffer
var err error
if inbound.User != nil {
validator := new(Validator)
validator.Add(inbound.User)
request, data, err = DecodeUDPPacket(validator, payload)
} else {
request, data, err = DecodeUDPPacket(s.validator, payload)
if err == nil {
inbound.User = request.User
}
}
if err != nil {
if inbound.Source.IsValid() {
newError("dropping invalid UDP packet from: ", inbound.Source).Base(err).WriteToLog(session.ExportIDToError(ctx))
log.Record(&log.AccessMessage{
From: inbound.Source,
To: "",
Status: log.AccessRejected,
Reason: err,
})
}
payload.Release()
continue
}
destination := request.Destination()
currentPacketCtx := ctx
if inbound.Source.IsValid() {
currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: inbound.Source,
To: destination,
Status: log.AccessAccepted,
Reason: "",
Email: request.User.Email,
})
}
newError("tunnelling request to ", destination).WriteToLog(session.ExportIDToError(currentPacketCtx))
data.UDP = &destination
if !s.cone || dest == nil {
dest = &destination
}
currentPacketCtx = protocol.ContextWithRequestHeader(currentPacketCtx, request)
udpServer.Dispatch(currentPacketCtx, *dest, data)
}
}
return nil
}
func (s *Server) handleConnection(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
sessionPolicy := s.policyManager.ForLevel(0)
if err := conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
return newError("unable to set read deadline").Base(err).AtWarning()
}
bufferedReader := buf.BufferedReader{Reader: buf.NewReader(conn)}
request, bodyReader, err := ReadTCPSession(s.validator, &bufferedReader)
if err != nil {
log.Record(&log.AccessMessage{
From: conn.RemoteAddr(),
To: "",
Status: log.AccessRejected,
Reason: err,
})
return newError("failed to create request from: ", conn.RemoteAddr()).Base(err)
}
conn.SetReadDeadline(time.Time{})
inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
inbound.User = request.User
dest := request.Destination()
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: conn.RemoteAddr(),
To: dest,
Status: log.AccessAccepted,
Reason: "",
Email: request.User.Email,
})
newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
sessionPolicy = s.policyManager.ForLevel(request.User.Level)
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
responseDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
bufferedWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
responseWriter, err := WriteTCPResponse(request, bufferedWriter)
if err != nil {
return newError("failed to write response").Base(err)
}
{
payload, err := link.Reader.ReadMultiBuffer()
if err != nil {
return err
}
if err := responseWriter.WriteMultiBuffer(payload); err != nil {
return err
}
}
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
if err := buf.Copy(link.Reader, responseWriter, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport all TCP response").Base(err)
}
return nil
}
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
if err := buf.Copy(bodyReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport all TCP request").Base(err)
}
return nil
}
var requestDoneAndCloseWriter = task.OnSuccess(requestDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDoneAndCloseWriter, responseDone); err != nil {
common.Interrupt(link.Reader)
common.Interrupt(link.Writer)
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}