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server.go
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server.go
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package socks
import (
"context"
"io"
"runtime"
"time"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
// Server is a SOCKS 5 proxy server
type Server struct {
config *ServerConfig
}
// NewServer creates a new Server object.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, newError("no space in context").AtWarning()
}
s := &Server{
config: config,
}
return s, nil
}
func (s *Server) Network() net.NetworkList {
list := net.NetworkList{
Network: []net.Network{net.Network_TCP},
}
if s.config.UdpEnabled {
list.Network = append(list.Network, net.Network_UDP)
}
return list
}
func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error {
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 dispatcher.Interface) error {
conn.SetReadDeadline(time.Now().Add(time.Second * 8))
reader := buf.NewBufferedReader(conn)
inboundDest, ok := proxy.InboundEntryPointFromContext(ctx)
if !ok {
return newError("inbound entry point not specified")
}
session := &ServerSession{
config: s.config,
port: inboundDest.Port,
}
request, err := session.Handshake(reader, conn)
if err != nil {
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Access(source, "", log.AccessRejected, err)
}
return newError("failed to read request").Base(err)
}
conn.SetReadDeadline(time.Time{})
if request.Command == protocol.RequestCommandTCP {
dest := request.Destination()
log.Trace(newError("TCP Connect request to ", dest))
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Access(source, dest, log.AccessAccepted, "")
}
return s.transport(ctx, reader, conn, dest, dispatcher)
}
if request.Command == protocol.RequestCommandUDP {
return s.handleUDP()
}
return nil
}
func (*Server) handleUDP() error {
// The TCP connection closes after v method returns. We need to wait until
// the client closes it.
// TODO: get notified from UDP part
<-time.After(5 * time.Minute)
return nil
}
func (v *Server) transport(ctx context.Context, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error {
timeout := time.Second * time.Duration(v.config.Timeout)
if timeout == 0 {
timeout = time.Minute * 2
}
ctx, timer := signal.CancelAfterInactivity(ctx, timeout)
ray, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
input := ray.InboundInput()
output := ray.InboundOutput()
requestDone := signal.ExecuteAsync(func() error {
defer input.Close()
v2reader := buf.NewReader(reader)
if err := buf.Copy(timer, v2reader, input); err != nil {
return newError("failed to transport all TCP request").Base(err)
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
v2writer := buf.NewWriter(writer)
if err := buf.Copy(timer, output, v2writer); err != nil {
return newError("failed to transport all TCP response").Base(err)
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
input.CloseError()
output.CloseError()
return newError("connection ends").Base(err)
}
runtime.KeepAlive(timer)
return nil
}
func (v *Server) handleUDPPayload(ctx context.Context, conn internet.Connection, dispatcher dispatcher.Interface) error {
udpServer := udp.NewDispatcher(dispatcher)
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Trace(newError("client UDP connection from ", source))
}
reader := buf.NewReader(conn)
for {
mpayload, err := reader.Read()
if err != nil {
return err
}
for _, payload := range mpayload {
request, data, err := DecodeUDPPacket(payload.Bytes())
if err != nil {
log.Trace(newError("failed to parse UDP request").Base(err))
continue
}
if len(data) == 0 {
continue
}
log.Trace(newError("send packet to ", request.Destination(), " with ", len(data), " bytes").AtDebug())
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Access(source, request.Destination, log.AccessAccepted, "")
}
dataBuf := buf.New()
dataBuf.Append(data)
udpServer.Dispatch(ctx, request.Destination(), dataBuf, func(payload *buf.Buffer) {
defer payload.Release()
log.Trace(newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug())
udpMessage := EncodeUDPPacket(request, payload.Bytes())
defer udpMessage.Release()
conn.Write(udpMessage.Bytes())
})
}
}
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}