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// +build !confonly
package socks
import (
"context"
"io"
"time"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/log"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
udp_proto "v2ray.com/core/common/protocol/udp"
"v2ray.com/core/common/session"
"v2ray.com/core/common/signal"
"v2ray.com/core/common/task"
"v2ray.com/core/features"
"v2ray.com/core/features/policy"
"v2ray.com/core/features/routing"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
// Server is a SOCKS 5 proxy server
type Server struct {
config *ServerConfig
policyManager policy.Manager
}
// NewServer creates a new Server object.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
v := core.MustFromContext(ctx)
s := &Server{
config: config,
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return s, nil
}
func (s *Server) policy() policy.Session {
config := s.config
p := s.policyManager.ForLevel(config.UserLevel)
if config.Timeout > 0 {
features.PrintDeprecatedFeatureWarning("Socks timeout")
}
if config.Timeout > 0 && config.UserLevel == 0 {
p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
}
return p
}
// Network implements proxy.Inbound.
func (s *Server) Network() []net.Network {
list := []net.Network{net.Network_TCP}
if s.config.UdpEnabled {
list = append(list, net.Network_UDP)
}
return list
}
// Process implements proxy.Inbound.
func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.Dispatcher) error {
if inbound := session.InboundFromContext(ctx); inbound != nil {
inbound.User = &protocol.MemoryUser{
Level: s.config.UserLevel,
}
}
switch network {
case net.Network_TCP:
return s.processTCP(ctx, conn, dispatcher)
case net.Network_UDP:
return s.handleUDPPayload(ctx, conn, dispatcher)
default:
return newError("unknown network: ", network)
}
}
func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
plcy := s.policy()
if err := conn.SetReadDeadline(time.Now().Add(plcy.Timeouts.Handshake)); err != nil {
newError("failed to set deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
inbound := session.InboundFromContext(ctx)
if inbound == nil || !inbound.Gateway.IsValid() {
return newError("inbound gateway not specified")
}
svrSession := &ServerSession{
config: s.config,
port: inbound.Gateway.Port,
}
reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
request, err := svrSession.Handshake(reader, conn)
if err != nil {
if inbound != nil && inbound.Source.IsValid() {
log.Record(&log.AccessMessage{
From: inbound.Source,
To: "",
Status: log.AccessRejected,
Reason: err,
})
}
return newError("failed to read request").Base(err)
}
if err := conn.SetReadDeadline(time.Time{}); err != nil {
newError("failed to clear deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
if request.Command == protocol.RequestCommandTCP {
dest := request.Destination()
newError("TCP Connect request to ", dest).WriteToLog(session.ExportIDToError(ctx))
if inbound != nil && inbound.Source.IsValid() {
log.Record(&log.AccessMessage{
From: inbound.Source,
To: dest,
Status: log.AccessAccepted,
Reason: "",
})
}
return s.transport(ctx, reader, conn, dest, dispatcher)
}
if request.Command == protocol.RequestCommandUDP {
return s.handleUDP(conn)
}
return nil
}
func (*Server) handleUDP(c io.Reader) error {
// The TCP connection closes after this method returns. We need to wait until
// the client closes it.
return common.Error2(io.Copy(buf.DiscardBytes, c))
}
func (s *Server) transport(ctx context.Context, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher routing.Dispatcher) error {
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, s.policy().Timeouts.ConnectionIdle)
plcy := s.policy()
ctx = policy.ContextWithBufferPolicy(ctx, plcy.Buffer)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
requestDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
if err := buf.Copy(buf.NewReader(reader), link.Writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport all TCP request").Base(err)
}
return nil
}
responseDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
v2writer := buf.NewWriter(writer)
if err := buf.Copy(link.Reader, v2writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to transport all TCP response").Base(err)
}
return nil
}
var requestDonePost = task.OnSuccess(requestDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDonePost, responseDone); err != nil {
common.Interrupt(link.Reader)
common.Interrupt(link.Writer)
return newError("connection ends").Base(err)
}
return nil
}
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) {
payload := packet.Payload
newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
request := protocol.RequestHeaderFromContext(ctx)
if request == nil {
return
}
udpMessage, err := EncodeUDPPacket(request, payload.Bytes())
payload.Release()
defer udpMessage.Release()
if err != nil {
newError("failed to write UDP response").AtWarning().Base(err).WriteToLog(session.ExportIDToError(ctx))
}
conn.Write(udpMessage.Bytes()) // nolint: errcheck
})
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
newError("client UDP connection from ", inbound.Source).WriteToLog(session.ExportIDToError(ctx))
}
reader := buf.NewPacketReader(conn)
for {
mpayload, err := reader.ReadMultiBuffer()
if err != nil {
return err
}
for _, payload := range mpayload {
request, err := DecodeUDPPacket(payload)
if err != nil {
newError("failed to parse UDP request").Base(err).WriteToLog(session.ExportIDToError(ctx))
payload.Release()
continue
}
if payload.IsEmpty() {
payload.Release()
continue
}
newError("send packet to ", request.Destination(), " with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
log.Record(&log.AccessMessage{
From: inbound.Source,
To: request.Destination(),
Status: log.AccessAccepted,
Reason: "",
})
}
ctx = protocol.ContextWithRequestHeader(ctx, request)
udpServer.Dispatch(ctx, request.Destination(), payload)
}
}
}
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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