forked from XTLS/Xray-core
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
526 lines (467 loc) · 15.3 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
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
package trojan
import (
"context"
"io"
"strconv"
"strings"
"time"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
udp_proto "github.com/xtls/xray-core/common/protocol/udp"
"github.com/xtls/xray-core/common/retry"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet/reality"
"github.com/xtls/xray-core/transport/internet/stat"
"github.com/xtls/xray-core/transport/internet/tls"
"github.com/xtls/xray-core/transport/internet/udp"
)
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}
// Server is an inbound connection handler that handles messages in trojan protocol.
type Server struct {
policyManager policy.Manager
validator *Validator
fallbacks map[string]map[string]map[string]*Fallback // or nil
cone bool
}
// NewServer creates a new trojan inbound handler.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
validator := new(Validator)
for _, user := range config.Users {
u, err := user.ToMemoryUser()
if err != nil {
return nil, newError("failed to get trojan user").Base(err).AtError()
}
if err := validator.Add(u); err != nil {
return nil, newError("failed to add user").Base(err).AtError()
}
}
v := core.MustFromContext(ctx)
server := &Server{
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
validator: validator,
cone: ctx.Value("cone").(bool),
}
if config.Fallbacks != nil {
server.fallbacks = make(map[string]map[string]map[string]*Fallback)
for _, fb := range config.Fallbacks {
if server.fallbacks[fb.Name] == nil {
server.fallbacks[fb.Name] = make(map[string]map[string]*Fallback)
}
if server.fallbacks[fb.Name][fb.Alpn] == nil {
server.fallbacks[fb.Name][fb.Alpn] = make(map[string]*Fallback)
}
server.fallbacks[fb.Name][fb.Alpn][fb.Path] = fb
}
if server.fallbacks[""] != nil {
for name, apfb := range server.fallbacks {
if name != "" {
for alpn := range server.fallbacks[""] {
if apfb[alpn] == nil {
apfb[alpn] = make(map[string]*Fallback)
}
}
}
}
}
for _, apfb := range server.fallbacks {
if apfb[""] != nil {
for alpn, pfb := range apfb {
if alpn != "" { // && alpn != "h2" {
for path, fb := range apfb[""] {
if pfb[path] == nil {
pfb[path] = fb
}
}
}
}
}
}
if server.fallbacks[""] != nil {
for name, apfb := range server.fallbacks {
if name != "" {
for alpn, pfb := range server.fallbacks[""] {
for path, fb := range pfb {
if apfb[alpn][path] == nil {
apfb[alpn][path] = fb
}
}
}
}
}
}
}
return server, nil
}
// AddUser implements proxy.UserManager.AddUser().
func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
return s.validator.Add(u)
}
// RemoveUser implements proxy.UserManager.RemoveUser().
func (s *Server) RemoveUser(ctx context.Context, e string) error {
return s.validator.Del(e)
}
// Network implements proxy.Inbound.Network().
func (s *Server) Network() []net.Network {
return []net.Network{net.Network_TCP, net.Network_UNIX}
}
// Process implements proxy.Inbound.Process().
func (s *Server) Process(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher) error {
sid := session.ExportIDToError(ctx)
iConn := conn
statConn, ok := iConn.(*stat.CounterConnection)
if ok {
iConn = statConn.Connection
}
sessionPolicy := s.policyManager.ForLevel(0)
if err := conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
return newError("unable to set read deadline").Base(err).AtWarning()
}
first := buf.FromBytes(make([]byte, buf.Size))
first.Clear()
firstLen, err := first.ReadFrom(conn)
if err != nil {
return newError("failed to read first request").Base(err)
}
newError("firstLen = ", firstLen).AtInfo().WriteToLog(sid)
bufferedReader := &buf.BufferedReader{
Reader: buf.NewReader(conn),
Buffer: buf.MultiBuffer{first},
}
var user *protocol.MemoryUser
napfb := s.fallbacks
isfb := napfb != nil
shouldFallback := false
if firstLen < 58 || first.Byte(56) != '\r' {
// invalid protocol
err = newError("not trojan protocol")
log.Record(&log.AccessMessage{
From: conn.RemoteAddr(),
To: "",
Status: log.AccessRejected,
Reason: err,
})
shouldFallback = true
} else {
user = s.validator.Get(hexString(first.BytesTo(56)))
if user == nil {
// invalid user, let's fallback
err = newError("not a valid user")
log.Record(&log.AccessMessage{
From: conn.RemoteAddr(),
To: "",
Status: log.AccessRejected,
Reason: err,
})
shouldFallback = true
}
}
if isfb && shouldFallback {
return s.fallback(ctx, sid, err, sessionPolicy, conn, iConn, napfb, first, firstLen, bufferedReader)
} else if shouldFallback {
return newError("invalid protocol or invalid user")
}
clientReader := &ConnReader{Reader: bufferedReader}
if err := clientReader.ParseHeader(); 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)
}
destination := clientReader.Target
if err := conn.SetReadDeadline(time.Time{}); err != nil {
return newError("unable to set read deadline").Base(err).AtWarning()
}
inbound := session.InboundFromContext(ctx)
if inbound == nil {
panic("no inbound metadata")
}
inbound.Name = "trojan"
inbound.User = user
sessionPolicy = s.policyManager.ForLevel(user.Level)
if destination.Network == net.Network_UDP { // handle udp request
return s.handleUDPPayload(ctx, &PacketReader{Reader: clientReader}, &PacketWriter{Writer: conn}, dispatcher)
}
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: conn.RemoteAddr(),
To: destination,
Status: log.AccessAccepted,
Reason: "",
Email: user.Email,
})
newError("received request for ", destination).WriteToLog(sid)
return s.handleConnection(ctx, sessionPolicy, destination, clientReader, buf.NewWriter(conn), dispatcher, iConn, statConn)
}
func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReader, clientWriter *PacketWriter, dispatcher routing.Dispatcher) error {
udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
udpPayload := packet.Payload
if udpPayload.UDP == nil {
udpPayload.UDP = &packet.Source
}
if err := clientWriter.WriteMultiBuffer(buf.MultiBuffer{udpPayload}); err != nil {
newError("failed to write response").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
})
inbound := session.InboundFromContext(ctx)
user := inbound.User
var dest *net.Destination
for {
select {
case <-ctx.Done():
return nil
default:
mb, err := clientReader.ReadMultiBuffer()
if err != nil {
if errors.Cause(err) != io.EOF {
return newError("unexpected EOF").Base(err)
}
return nil
}
mb2, b := buf.SplitFirst(mb)
if b == nil {
continue
}
destination := *b.UDP
currentPacketCtx := ctx
if inbound.Source.IsValid() {
currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: inbound.Source,
To: destination,
Status: log.AccessAccepted,
Reason: "",
Email: user.Email,
})
}
newError("tunnelling request to ", destination).WriteToLog(session.ExportIDToError(ctx))
if !s.cone || dest == nil {
dest = &destination
}
udpServer.Dispatch(currentPacketCtx, *dest, b) // first packet
for _, payload := range mb2 {
udpServer.Dispatch(currentPacketCtx, *dest, payload)
}
}
}
}
func (s *Server) handleConnection(ctx context.Context, sessionPolicy policy.Session,
destination net.Destination,
clientReader buf.Reader,
clientWriter buf.Writer, dispatcher routing.Dispatcher, iConn stat.Connection, statConn *stat.CounterConnection,
) error {
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
link, err := dispatcher.Dispatch(ctx, destination)
if err != nil {
return newError("failed to dispatch request to ", destination).Base(err)
}
requestDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
if buf.Copy(clientReader, link.Writer, buf.UpdateActivity(timer)) != nil {
return newError("failed to transfer request").Base(err)
}
return nil
}
responseDone := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
if err := buf.Copy(link.Reader, clientWriter, buf.UpdateActivity(timer)); err != nil {
return newError("failed to write response").Base(err)
}
return nil
}
requestDonePost := task.OnSuccess(requestDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDonePost, responseDone); err != nil {
common.Must(common.Interrupt(link.Reader))
common.Must(common.Interrupt(link.Writer))
return newError("connection ends").Base(err)
}
return nil
}
func (s *Server) fallback(ctx context.Context, sid errors.ExportOption, err error, sessionPolicy policy.Session, connection stat.Connection, iConn stat.Connection, napfb map[string]map[string]map[string]*Fallback, first *buf.Buffer, firstLen int64, reader buf.Reader) error {
if err := connection.SetReadDeadline(time.Time{}); err != nil {
newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid)
}
newError("fallback starts").Base(err).AtInfo().WriteToLog(sid)
name := ""
alpn := ""
if tlsConn, ok := iConn.(*tls.Conn); ok {
cs := tlsConn.ConnectionState()
name = cs.ServerName
alpn = cs.NegotiatedProtocol
newError("realName = " + name).AtInfo().WriteToLog(sid)
newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
} else if realityConn, ok := iConn.(*reality.Conn); ok {
cs := realityConn.ConnectionState()
name = cs.ServerName
alpn = cs.NegotiatedProtocol
newError("realName = " + name).AtInfo().WriteToLog(sid)
newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
}
name = strings.ToLower(name)
alpn = strings.ToLower(alpn)
if len(napfb) > 1 || napfb[""] == nil {
if name != "" && napfb[name] == nil {
match := ""
for n := range napfb {
if n != "" && strings.Contains(name, n) && len(n) > len(match) {
match = n
}
}
name = match
}
}
if napfb[name] == nil {
name = ""
}
apfb := napfb[name]
if apfb == nil {
return newError(`failed to find the default "name" config`).AtWarning()
}
if apfb[alpn] == nil {
alpn = ""
}
pfb := apfb[alpn]
if pfb == nil {
return newError(`failed to find the default "alpn" config`).AtWarning()
}
path := ""
if len(pfb) > 1 || pfb[""] == nil {
if firstLen >= 18 && first.Byte(4) != '*' { // not h2c
firstBytes := first.Bytes()
for i := 4; i <= 8; i++ { // 5 -> 9
if firstBytes[i] == '/' && firstBytes[i-1] == ' ' {
search := len(firstBytes)
if search > 64 {
search = 64 // up to about 60
}
for j := i + 1; j < search; j++ {
k := firstBytes[j]
if k == '\r' || k == '\n' { // avoid logging \r or \n
break
}
if k == '?' || k == ' ' {
path = string(firstBytes[i:j])
newError("realPath = " + path).AtInfo().WriteToLog(sid)
if pfb[path] == nil {
path = ""
}
break
}
}
break
}
}
}
}
fb := pfb[path]
if fb == nil {
return newError(`failed to find the default "path" config`).AtWarning()
}
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
var conn net.Conn
if err := retry.ExponentialBackoff(5, 100).On(func() error {
var dialer net.Dialer
conn, err = dialer.DialContext(ctx, fb.Type, fb.Dest)
if err != nil {
return err
}
return nil
}); err != nil {
return newError("failed to dial to " + fb.Dest).Base(err).AtWarning()
}
defer conn.Close()
serverReader := buf.NewReader(conn)
serverWriter := buf.NewWriter(conn)
postRequest := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
if fb.Xver != 0 {
ipType := 4
remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
if err != nil {
ipType = 0
}
localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
if err != nil {
ipType = 0
}
if ipType == 4 {
for i := 0; i < len(remoteAddr); i++ {
if remoteAddr[i] == ':' {
ipType = 6
break
}
}
}
pro := buf.New()
defer pro.Release()
switch fb.Xver {
case 1:
if ipType == 0 {
common.Must2(pro.Write([]byte("PROXY UNKNOWN\r\n")))
break
}
if ipType == 4 {
common.Must2(pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
} else {
common.Must2(pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
}
case 2:
common.Must2(pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"))) // signature
if ipType == 0 {
common.Must2(pro.Write([]byte("\x20\x00\x00\x00"))) // v2 + LOCAL + UNSPEC + UNSPEC + 0 bytes
break
}
if ipType == 4 {
common.Must2(pro.Write([]byte("\x21\x11\x00\x0C"))) // v2 + PROXY + AF_INET + STREAM + 12 bytes
common.Must2(pro.Write(net.ParseIP(remoteAddr).To4()))
common.Must2(pro.Write(net.ParseIP(localAddr).To4()))
} else {
common.Must2(pro.Write([]byte("\x21\x21\x00\x24"))) // v2 + PROXY + AF_INET6 + STREAM + 36 bytes
common.Must2(pro.Write(net.ParseIP(remoteAddr).To16()))
common.Must2(pro.Write(net.ParseIP(localAddr).To16()))
}
p1, _ := strconv.ParseUint(remotePort, 10, 16)
p2, _ := strconv.ParseUint(localPort, 10, 16)
common.Must2(pro.Write([]byte{byte(p1 >> 8), byte(p1), byte(p2 >> 8), byte(p2)}))
}
if err := serverWriter.WriteMultiBuffer(buf.MultiBuffer{pro}); err != nil {
return newError("failed to set PROXY protocol v", fb.Xver).Base(err).AtWarning()
}
}
if err := buf.Copy(reader, serverWriter, buf.UpdateActivity(timer)); err != nil {
return newError("failed to fallback request payload").Base(err).AtInfo()
}
return nil
}
writer := buf.NewWriter(connection)
getResponse := func() error {
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
if err := buf.Copy(serverReader, writer, buf.UpdateActivity(timer)); err != nil {
return newError("failed to deliver response payload").Base(err).AtInfo()
}
return nil
}
if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), task.OnSuccess(getResponse, task.Close(writer))); err != nil {
common.Must(common.Interrupt(serverReader))
common.Must(common.Interrupt(serverWriter))
return newError("fallback ends").Base(err).AtInfo()
}
return nil
}