forked from quic-go/quic-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
476 lines (428 loc) · 13 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
package quic
import (
"bytes"
"crypto/tls"
"errors"
"fmt"
"io"
"net"
"sync"
"time"
"github.com/boisjacques/qed/internal/handshake"
"github.com/boisjacques/qed/internal/protocol"
"github.com/boisjacques/qed/internal/utils"
"github.com/boisjacques/qed/internal/wire"
)
// packetHandler handles packets
type packetHandler interface {
handlePacket(*receivedPacket)
io.Closer
destroy(error)
GetVersion() protocol.VersionNumber
GetPerspective() protocol.Perspective
}
type unknownPacketHandler interface {
handlePacket(*receivedPacket)
closeWithError(error) error
}
type packetHandlerManager interface {
Add(protocol.ConnectionID, packetHandler)
SetServer(unknownPacketHandler)
Remove(protocol.ConnectionID)
CloseServer()
AddConn(conn net.PacketConn)
}
type quicSession interface {
Session
handlePacket(*receivedPacket)
GetVersion() protocol.VersionNumber
run() error
destroy(error)
closeRemote(error)
SetPacketHandlerManager(manager packetHandlerManager)
}
type sessionRunner interface {
onHandshakeComplete(Session)
removeConnectionID(protocol.ConnectionID)
}
type runner struct {
onHandshakeCompleteImpl func(Session)
removeConnectionIDImpl func(protocol.ConnectionID)
}
func (r *runner) onHandshakeComplete(s Session) { r.onHandshakeCompleteImpl(s) }
func (r *runner) removeConnectionID(c protocol.ConnectionID) { r.removeConnectionIDImpl(c) }
var _ sessionRunner = &runner{}
// A Listener of QUIC
type server struct {
mutex sync.Mutex
tlsConf *tls.Config
config *Config
conn net.PacketConn
// If the server is started with ListenAddr, we create a packet Conn.
// If it is started with Listen, we take a packet Conn as a parameter.
createdPacketConn bool
cookieGenerator *handshake.CookieGenerator
sessionHandler packetHandlerManager
// set as a member, so they can be set in the tests
newSession func(Connection,
sessionRunner,
protocol.ConnectionID /* original Connection ID */,
protocol.ConnectionID /* destination Connection ID */,
protocol.ConnectionID /* source Connection ID */,
*Config,
*tls.Config,
*handshake.TransportParameters,
utils.Logger,
protocol.VersionNumber) (quicSession, error)
serverError error
errorChan chan struct{}
closed bool
sessionQueue chan Session
sessionRunner sessionRunner
logger utils.Logger
}
var _ Listener = &server{}
var _ unknownPacketHandler = &server{}
// ListenAddr creates a QUIC server listening on a given address.
// The tls.Config must not be nil, the quic.Config may be nil.
func ListenAddr(addr string, tlsConf *tls.Config, config *Config) (Listener, error) {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
return nil, err
}
serv, err := listen(conn, tlsConf, config)
if err != nil {
return nil, err
}
serv.createdPacketConn = true
return serv, nil
}
// Listen listens for QUIC connections on a given net.PacketConn.
// The tls.Config must not be nil, the quic.Config may be nil.
func Listen(conn net.PacketConn, tlsConf *tls.Config, config *Config) (Listener, error) {
return listen(conn, tlsConf, config)
}
func listen(conn net.PacketConn, tlsConf *tls.Config, config *Config) (*server, error) {
config = populateServerConfig(config)
for _, v := range config.Versions {
if !protocol.IsValidVersion(v) {
return nil, fmt.Errorf("%s is not a valid QUIC version", v)
}
}
sessionHandler, err := getMultiplexer().AddConn(conn, config.ConnectionIDLength)
if err != nil {
return nil, err
}
s := &server{
conn: conn,
tlsConf: tlsConf,
config: config,
sessionHandler: sessionHandler,
sessionQueue: make(chan Session, 5),
errorChan: make(chan struct{}),
newSession: newSession,
logger: utils.DefaultLogger.WithPrefix("server"),
}
if err := s.setup(); err != nil {
return nil, err
}
sessionHandler.SetServer(s)
s.logger.Debugf("Listening for %s connections on %s", conn.LocalAddr().Network(), conn.LocalAddr().String())
return s, nil
}
func (s *server) setup() error {
s.sessionRunner = &runner{
onHandshakeCompleteImpl: func(sess Session) { s.sessionQueue <- sess },
removeConnectionIDImpl: s.sessionHandler.Remove,
}
cookieGenerator, err := handshake.NewCookieGenerator()
if err != nil {
return err
}
s.cookieGenerator = cookieGenerator
return nil
}
var defaultAcceptCookie = func(clientAddr net.Addr, cookie *Cookie) bool {
if cookie == nil {
return false
}
if time.Now().After(cookie.SentTime.Add(protocol.CookieExpiryTime)) {
return false
}
var sourceAddr string
if udpAddr, ok := clientAddr.(*net.UDPAddr); ok {
sourceAddr = udpAddr.IP.String()
} else {
sourceAddr = clientAddr.String()
}
return sourceAddr == cookie.RemoteAddr
}
// populateServerConfig populates fields in the quic.Config with their default values, if none are set
// it may be called with nil
func populateServerConfig(config *Config) *Config {
if config == nil {
config = &Config{}
}
versions := config.Versions
if len(versions) == 0 {
versions = protocol.SupportedVersions
}
vsa := defaultAcceptCookie
if config.AcceptCookie != nil {
vsa = config.AcceptCookie
}
handshakeTimeout := protocol.DefaultHandshakeTimeout
if config.HandshakeTimeout != 0 {
handshakeTimeout = config.HandshakeTimeout
}
idleTimeout := protocol.DefaultIdleTimeout
if config.IdleTimeout != 0 {
idleTimeout = config.IdleTimeout
}
maxReceiveStreamFlowControlWindow := config.MaxReceiveStreamFlowControlWindow
if maxReceiveStreamFlowControlWindow == 0 {
maxReceiveStreamFlowControlWindow = protocol.DefaultMaxReceiveStreamFlowControlWindow
}
maxReceiveConnectionFlowControlWindow := config.MaxReceiveConnectionFlowControlWindow
if maxReceiveConnectionFlowControlWindow == 0 {
maxReceiveConnectionFlowControlWindow = protocol.DefaultMaxReceiveConnectionFlowControlWindow
}
maxIncomingStreams := config.MaxIncomingStreams
if maxIncomingStreams == 0 {
maxIncomingStreams = protocol.DefaultMaxIncomingStreams
} else if maxIncomingStreams < 0 {
maxIncomingStreams = 0
}
maxIncomingUniStreams := config.MaxIncomingUniStreams
if maxIncomingUniStreams == 0 {
maxIncomingUniStreams = protocol.DefaultMaxIncomingUniStreams
} else if maxIncomingUniStreams < 0 {
maxIncomingUniStreams = 0
}
connIDLen := config.ConnectionIDLength
if connIDLen == 0 {
connIDLen = protocol.DefaultConnectionIDLength
}
return &Config{
Versions: versions,
HandshakeTimeout: handshakeTimeout,
IdleTimeout: idleTimeout,
AcceptCookie: vsa,
KeepAlive: config.KeepAlive,
MaxReceiveStreamFlowControlWindow: maxReceiveStreamFlowControlWindow,
MaxReceiveConnectionFlowControlWindow: maxReceiveConnectionFlowControlWindow,
MaxIncomingStreams: maxIncomingStreams,
MaxIncomingUniStreams: maxIncomingUniStreams,
ConnectionIDLength: connIDLen,
}
}
// Accept returns newly openend sessions
func (s *server) Accept() (Session, error) {
var sess Session
select {
case sess = <-s.sessionQueue:
return sess, nil
case <-s.errorChan:
return nil, s.serverError
}
}
// Close the server
func (s *server) Close() error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.closed {
return nil
}
return s.closeWithMutex()
}
func (s *server) closeWithMutex() error {
s.sessionHandler.CloseServer()
if s.serverError == nil {
s.serverError = errors.New("server closed")
}
var err error
// If the server was started with ListenAddr, we created the packet Conn.
// We need to close it in order to make the go routine reading from that Conn return.
if s.createdPacketConn {
err = s.conn.Close()
}
s.closed = true
close(s.errorChan)
return err
}
func (s *server) closeWithError(e error) error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.closed {
return nil
}
s.serverError = e
return s.closeWithMutex()
}
// Addr returns the server's network address
func (s *server) Addr() net.Addr {
return s.conn.LocalAddr()
}
func (s *server) handlePacket(p *receivedPacket) {
if err := s.handlePacketImpl(p); err != nil {
s.logger.Debugf("error handling packet from %s: %s", p.remoteAddr, err)
}
}
func (s *server) handlePacketImpl(p *receivedPacket) error {
hdr := p.header
if hdr.IsLongHeader {
// send a Version Negotiation Packet if the client is speaking a different protocol version
if !protocol.IsSupportedVersion(s.config.Versions, hdr.Version) {
return s.sendVersionNegotiationPacket(p)
}
}
if hdr.Type == protocol.PacketTypeInitial {
go s.handleInitial(p)
}
// TODO(#943): send Stateless Reset
return nil
}
func (s *server) handleInitial(p *receivedPacket) {
// TODO: add a check that DestConnID == SrcConnID
s.logger.Debugf("<- Received Initial packet.")
sess, connID, err := s.handleInitialImpl(p)
if err != nil {
s.logger.Errorf("Error occurred handling initial packet: %s", err)
return
}
if sess == nil { // a retry was done
return
}
serverSession := newServerSession(sess, s.config, s.logger)
s.sessionHandler.Add(connID, serverSession)
}
func (s *server) handleInitialImpl(p *receivedPacket) (quicSession, protocol.ConnectionID, error) {
hdr := p.header
if len(hdr.Token) == 0 && hdr.DestConnectionID.Len() < protocol.MinConnectionIDLenInitial {
return nil, nil, errors.New("dropping Initial packet with too short Connection ID")
}
if len(hdr.Raw)+len(p.data) < protocol.MinInitialPacketSize {
return nil, nil, errors.New("dropping too small Initial packet")
}
var cookie *Cookie
var origDestConnectionID protocol.ConnectionID
if len(hdr.Token) > 0 {
c, err := s.cookieGenerator.DecodeToken(hdr.Token)
if err == nil {
cookie = &Cookie{
RemoteAddr: c.RemoteAddr,
SentTime: c.SentTime,
}
origDestConnectionID = c.OriginalDestConnectionID
}
}
if !s.config.AcceptCookie(p.remoteAddr, cookie) {
// Log the Initial packet now.
// If no Retry is sent, the packet will be logged by the session.
p.header.Log(s.logger)
return nil, nil, s.sendRetry(p.remoteAddr, hdr)
}
connID, err := protocol.GenerateConnectionID(s.config.ConnectionIDLength)
if err != nil {
return nil, nil, err
}
s.logger.Debugf("Changing Connection ID to %s.", connID)
sess, err := s.createNewSession(
p.remoteAddr,
origDestConnectionID,
hdr.DestConnectionID,
hdr.SrcConnectionID,
connID,
hdr.Version,
)
if err != nil {
return nil, nil, err
}
sess.handlePacket(p)
return sess, connID, nil
}
func (s *server) createNewSession(
remoteAddr net.Addr,
origDestConnID protocol.ConnectionID,
clientDestConnID protocol.ConnectionID,
destConnID protocol.ConnectionID,
srcConnID protocol.ConnectionID,
version protocol.VersionNumber,
) (quicSession, error) {
params := &handshake.TransportParameters{
InitialMaxStreamDataBidiLocal: protocol.InitialMaxStreamData,
InitialMaxStreamDataBidiRemote: protocol.InitialMaxStreamData,
InitialMaxStreamDataUni: protocol.InitialMaxStreamData,
InitialMaxData: protocol.InitialMaxData,
IdleTimeout: s.config.IdleTimeout,
MaxBidiStreams: uint64(s.config.MaxIncomingStreams),
MaxUniStreams: uint64(s.config.MaxIncomingUniStreams),
DisableMigration: true,
// TODO(#855): generate a real token
StatelessResetToken: bytes.Repeat([]byte{42}, 16),
OriginalConnectionID: origDestConnID,
}
sched := NewScheduler(nil, s.conn, remoteAddr)
sess, err := s.newSession(
sched,
s.sessionRunner,
clientDestConnID,
destConnID,
srcConnID,
s.config,
s.tlsConf,
params,
s.logger,
version,
)
if err != nil {
return nil, err
}
sched.session = sess
sess.SetPacketHandlerManager(s.sessionHandler)
go sess.run()
return sess, nil
}
func (s *server) sendRetry(remoteAddr net.Addr, hdr *wire.Header) error {
token, err := s.cookieGenerator.NewToken(remoteAddr, hdr.DestConnectionID)
if err != nil {
return err
}
connID, err := protocol.GenerateConnectionID(s.config.ConnectionIDLength)
if err != nil {
return err
}
replyHdr := &wire.Header{
IsLongHeader: true,
Type: protocol.PacketTypeRetry,
Version: hdr.Version,
SrcConnectionID: connID,
DestConnectionID: hdr.SrcConnectionID,
OrigDestConnectionID: hdr.DestConnectionID,
Token: token,
}
s.logger.Debugf("Changing Connection ID to %s.\n-> Sending Retry", connID)
replyHdr.Log(s.logger)
buf := &bytes.Buffer{}
if err := replyHdr.Write(buf, protocol.PerspectiveServer, hdr.Version); err != nil {
return err
}
if _, err := s.conn.WriteTo(buf.Bytes(), remoteAddr); err != nil {
s.logger.Debugf("Error sending Retry: %s", err)
}
return nil
}
func (s *server) sendVersionNegotiationPacket(p *receivedPacket) error {
hdr := p.header
s.logger.Debugf("Client offered version %s, sending VersionNegotiationPacket", hdr.Version)
data, err := wire.ComposeVersionNegotiation(hdr.SrcConnectionID, hdr.DestConnectionID, s.config.Versions)
if err != nil {
return err
}
_, err = s.conn.WriteTo(data, p.remoteAddr)
return err
}