-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
server.go
247 lines (209 loc) · 6.69 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
package shadowsocks
import (
"context"
"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/policy"
"v2ray.com/core/features/routing"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
type Server struct {
config ServerConfig
user *protocol.MemoryUser
policyManager policy.Manager
}
// NewServer create a new Shadowsocks server.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
if config.GetUser() == nil {
return nil, newError("user is not specified")
}
mUser, err := config.User.ToMemoryUser()
if err != nil {
return nil, newError("failed to parse user account").Base(err)
}
v := core.MustFromContext(ctx)
s := &Server{
config: *config,
user: mUser,
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return s, nil
}
func (s *Server) Network() []net.Network {
list := s.config.Network
if len(list) == 0 {
list = append(list, net.Network_TCP)
}
if s.config.UdpEnabled {
list = append(list, net.Network_UDP)
}
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:
return newError("unknown network: ", network)
}
}
func (s *Server) handlerUDPPayload(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
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())
})
account := s.user.Account.(*MemoryAccount)
inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
inbound.User = s.user
reader := buf.NewReader(conn)
for {
mpayload, err := reader.ReadMultiBuffer()
if err != nil {
break
}
for _, payload := range mpayload {
request, data, err := DecodeUDPPacket(s.user, payload)
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))
log.Record(&log.AccessMessage{
From: inbound.Source,
To: "",
Status: log.AccessRejected,
Reason: err,
})
}
payload.Release()
continue
}
if request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Disabled {
newError("client payload enables OTA but server doesn't allow it").WriteToLog(session.ExportIDToError(ctx))
payload.Release()
continue
}
if !request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Enabled {
newError("client payload disables OTA but server forces it").WriteToLog(session.ExportIDToError(ctx))
payload.Release()
continue
}
dest := request.Destination()
if inbound.Source.IsValid() {
log.Record(&log.AccessMessage{
From: inbound.Source,
To: dest,
Status: log.AccessAccepted,
Reason: "",
})
}
newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
ctx = protocol.ContextWithRequestHeader(ctx, request)
udpServer.Dispatch(ctx, dest, data)
}
}
return nil
}
func (s *Server) handleConnection(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
sessionPolicy := s.policyManager.ForLevel(s.user.Level)
conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake))
bufferedReader := buf.BufferedReader{Reader: buf.NewReader(conn)}
request, bodyReader, err := ReadTCPSession(s.user, &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 = s.user
dest := request.Destination()
log.Record(&log.AccessMessage{
From: conn.RemoteAddr(),
To: dest,
Status: log.AccessAccepted,
Reason: "",
})
newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
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))
}))
}