v2ray-core/proxy/shadowsocks/server.go

208 lines
5.5 KiB
Go

package shadowsocks
import (
"context"
"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"
)
type Server struct {
config *ServerConfig
user *protocol.User
account *ShadowsocksAccount
}
// NewServer create a new Shadowsocks server.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
space := app.SpaceFromContext(ctx)
if space == nil {
return nil, newError("no space in context")
}
if config.GetUser() == nil {
return nil, newError("user is not specified")
}
rawAccount, err := config.User.GetTypedAccount()
if err != nil {
return nil, newError("failed to get user account").Base(err)
}
account := rawAccount.(*ShadowsocksAccount)
s := &Server{
config: config,
user: config.GetUser(),
account: account,
}
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.handleConnection(ctx, conn, dispatcher)
case net.Network_UDP:
return s.handlerUDPPayload(ctx, conn, dispatcher)
default:
return newError("unknown network: ", network)
}
}
func (v *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher dispatcher.Interface) error {
udpServer := udp.NewDispatcher(dispatcher)
reader := buf.NewReader(conn)
for {
mpayload, err := reader.Read()
if err != nil {
break
}
for _, payload := range mpayload {
request, data, err := DecodeUDPPacket(v.user, payload)
if err != nil {
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Trace(newError("dropping invalid UDP packet from: ", source).Base(err))
log.Access(source, "", log.AccessRejected, err)
}
payload.Release()
continue
}
if request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Disabled {
log.Trace(newError("client payload enables OTA but server doesn't allow it"))
payload.Release()
continue
}
if !request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Enabled {
log.Trace(newError("client payload disables OTA but server forces it"))
payload.Release()
continue
}
dest := request.Destination()
if source, ok := proxy.SourceFromContext(ctx); ok {
log.Access(source, dest, log.AccessAccepted, "")
}
log.Trace(newError("tunnelling request to ", dest))
ctx = protocol.ContextWithUser(ctx, request.User)
udpServer.Dispatch(ctx, dest, data, func(payload *buf.Buffer) {
defer payload.Release()
data, err := EncodeUDPPacket(request, payload.Bytes())
if err != nil {
log.Trace(newError("failed to encode UDP packet").Base(err).AtWarning())
return
}
defer data.Release()
conn.Write(data.Bytes())
})
}
}
return nil
}
func (s *Server) handleConnection(ctx context.Context, conn internet.Connection, dispatcher dispatcher.Interface) error {
conn.SetReadDeadline(time.Now().Add(time.Second * 8))
bufferedReader := buf.NewBufferedReader(conn)
request, bodyReader, err := ReadTCPSession(s.user, bufferedReader)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
return newError("failed to create request from: ", conn.RemoteAddr()).Base(err)
}
conn.SetReadDeadline(time.Time{})
bufferedReader.SetBuffered(false)
dest := request.Destination()
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Trace(newError("tunnelling request to ", dest))
ctx = protocol.ContextWithUser(ctx, request.User)
userSettings := s.user.GetSettings()
ctx, timer := signal.CancelAfterInactivity(ctx, userSettings.PayloadTimeout)
ray, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
responseDone := signal.ExecuteAsync(func() error {
bufferedWriter := buf.NewBufferedWriter(conn)
responseWriter, err := WriteTCPResponse(request, bufferedWriter)
if err != nil {
return newError("failed to write response").Base(err)
}
payload, err := ray.InboundOutput().Read()
if err != nil {
return err
}
if err := responseWriter.Write(payload); err != nil {
return err
}
payload.Release()
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
if err := buf.Copy(timer, ray.InboundOutput(), responseWriter); err != nil {
return newError("failed to transport all TCP response").Base(err)
}
return nil
})
requestDone := signal.ExecuteAsync(func() error {
defer ray.InboundInput().Close()
if err := buf.Copy(timer, bodyReader, ray.InboundInput()); err != nil {
return newError("failed to transport all TCP request").Base(err)
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
ray.InboundInput().CloseError()
ray.InboundOutput().CloseError()
return newError("connection ends").Base(err)
}
runtime.KeepAlive(timer)
return nil
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}