-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
291 lines (237 loc) · 7.81 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
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
// R.I.P Shadowsocks
package shadowsocks
import (
"crypto/rand"
"io"
"sync"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/common"
"v2ray.com/core/common/alloc"
"v2ray.com/core/common/crypto"
v2io "v2ray.com/core/common/io"
"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/proxy"
"v2ray.com/core/proxy/registry"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/udp"
)
type Server struct {
packetDispatcher dispatcher.PacketDispatcher
config *Config
cipher Cipher
cipherKey []byte
meta *proxy.InboundHandlerMeta
accepting bool
tcpHub *internet.TCPHub
udpHub *udp.UDPHub
udpServer *udp.UDPServer
}
func NewServer(config *Config, space app.Space, meta *proxy.InboundHandlerMeta) (*Server, error) {
if config.GetUser() == nil {
return nil, protocol.ErrUserMissing
}
account := new(Account)
if _, err := config.GetUser().GetTypedAccount(account); err != nil {
return nil, err
}
cipher := config.GetCipher()
s := &Server{
config: config,
meta: meta,
cipher: cipher,
cipherKey: account.GetCipherKey(cipher.KeySize()),
}
space.InitializeApplication(func() error {
if !space.HasApp(dispatcher.APP_ID) {
return app.ErrMissingApplication
}
s.packetDispatcher = space.GetApp(dispatcher.APP_ID).(dispatcher.PacketDispatcher)
return nil
})
return s, nil
}
func (this *Server) Port() v2net.Port {
return this.meta.Port
}
func (this *Server) Close() {
this.accepting = false
// TODO: synchronization
if this.tcpHub != nil {
this.tcpHub.Close()
this.tcpHub = nil
}
if this.udpHub != nil {
this.udpHub.Close()
this.udpHub = nil
}
}
func (this *Server) Start() error {
if this.accepting {
return nil
}
tcpHub, err := internet.ListenTCP(this.meta.Address, this.meta.Port, this.handleConnection, this.meta.StreamSettings)
if err != nil {
log.Error("Shadowsocks: Failed to listen TCP on ", this.meta.Address, ":", this.meta.Port, ": ", err)
return err
}
this.tcpHub = tcpHub
if this.config.UdpEnabled {
this.udpServer = udp.NewUDPServer(this.meta, this.packetDispatcher)
udpHub, err := udp.ListenUDP(this.meta.Address, this.meta.Port, udp.ListenOption{Callback: this.handlerUDPPayload})
if err != nil {
log.Error("Shadowsocks: Failed to listen UDP on ", this.meta.Address, ":", this.meta.Port, ": ", err)
return err
}
this.udpHub = udpHub
}
this.accepting = true
return nil
}
func (this *Server) handlerUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
defer payload.Release()
source := session.Source
ivLen := this.cipher.IVSize()
iv := payload.Value[:ivLen]
payload.SliceFrom(ivLen)
stream, err := this.cipher.NewDecodingStream(this.cipherKey, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, payload)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(this.cipherKey, iv)), true)
if err != nil {
if err != io.EOF {
log.Access(source, "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", source, ": ", err)
}
return
}
//defer request.Release()
dest := v2net.UDPDestination(request.Address, request.Port)
log.Access(source, dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: dest}, request.DetachUDPPayload(), func(destination v2net.Destination, payload *alloc.Buffer) {
defer payload.Release()
response := alloc.NewBuffer().Slice(0, ivLen)
defer response.Release()
rand.Read(response.Value)
respIv := response.Value
stream, err := this.cipher.NewEncodingStream(this.cipherKey, respIv)
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
writer := crypto.NewCryptionWriter(stream, response)
switch request.Address.Family() {
case v2net.AddressFamilyIPv4:
writer.Write([]byte{AddrTypeIPv4})
writer.Write(request.Address.IP())
case v2net.AddressFamilyIPv6:
writer.Write([]byte{AddrTypeIPv6})
writer.Write(request.Address.IP())
case v2net.AddressFamilyDomain:
writer.Write([]byte{AddrTypeDomain, byte(len(request.Address.Domain()))})
writer.Write([]byte(request.Address.Domain()))
}
writer.Write(request.Port.Bytes(nil))
writer.Write(payload.Value)
if request.OTA {
respAuth := NewAuthenticator(HeaderKeyGenerator(this.cipherKey, respIv))
respAuth.Authenticate(response.Value, response.Value[ivLen:])
}
this.udpHub.WriteTo(response.Value, source)
})
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
timedReader := v2net.NewTimeOutReader(16, conn)
defer timedReader.Release()
bufferedReader := v2io.NewBufferedReader(timedReader)
defer bufferedReader.Release()
ivLen := this.cipher.IVSize()
_, err := io.ReadFull(bufferedReader, buffer.Value[:ivLen])
if err != nil {
if err != io.EOF {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Failed to read IV: ", err)
}
return
}
iv := buffer.Value[:ivLen]
stream, err := this.cipher.NewDecodingStream(this.cipherKey, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, bufferedReader)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(this.cipherKey, iv)), false)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", conn.RemoteAddr(), ": ", err)
return
}
defer request.Release()
bufferedReader.SetCached(false)
userSettings := this.config.GetUser().GetSettings()
timedReader.SetTimeOut(userSettings.PayloadReadTimeout)
dest := v2net.TCPDestination(request.Address, request.Port)
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(this.meta, &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
})
defer ray.InboundOutput().Release()
var writeFinish sync.Mutex
writeFinish.Lock()
go func() {
if payload, err := ray.InboundOutput().Read(); err == nil {
payload.SliceBack(ivLen)
rand.Read(payload.Value[:ivLen])
stream, err := this.cipher.NewEncodingStream(this.cipherKey, payload.Value[:ivLen])
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
stream.XORKeyStream(payload.Value[ivLen:], payload.Value[ivLen:])
conn.Write(payload.Value)
payload.Release()
writer := crypto.NewCryptionWriter(stream, conn)
v2writer := v2io.NewAdaptiveWriter(writer)
v2io.Pipe(ray.InboundOutput(), v2writer)
writer.Release()
v2writer.Release()
}
writeFinish.Unlock()
}()
var payloadReader v2io.Reader
if request.OTA {
payloadAuth := NewAuthenticator(ChunkKeyGenerator(iv))
payloadReader = NewChunkReader(reader, payloadAuth)
} else {
payloadReader = v2io.NewAdaptiveReader(reader)
}
v2io.Pipe(payloadReader, ray.InboundInput())
ray.InboundInput().Close()
payloadReader.Release()
writeFinish.Lock()
}
type ServerFactory struct{}
func (this *ServerFactory) StreamCapability() internet.StreamConnectionType {
return internet.StreamConnectionTypeRawTCP
}
func (this *ServerFactory) Create(space app.Space, rawConfig interface{}, meta *proxy.InboundHandlerMeta) (proxy.InboundHandler, error) {
if !space.HasApp(dispatcher.APP_ID) {
return nil, common.ErrBadConfiguration
}
return NewServer(rawConfig.(*Config), space, meta)
}
func init() {
registry.MustRegisterInboundHandlerCreator("shadowsocks", new(ServerFactory))
}