source: code/trunk/downstream.go@ 259

Last change on this file since 259 was 259, checked in by contact, 5 years ago

Kill downstreamConn.marshal{Nick,Channel}

We can just use downstreamConn.marshalEntity instead.
File size: 31.4 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48var errAuthFailed = ircError{&irc.Message{
49 Command: irc.ERR_PASSWDMISMATCH,
50 Params: []string{"*", "Invalid username or password"},
51}}
52
53type downstreamConn struct {
54 conn
55
56 id uint64
57
58 registered bool
59 user *user
60 nick string
61 rawUsername string
62 networkName string
63 clientName string
64 realname string
65 hostname string
66 password string // empty after authentication
67 network *network // can be nil
68
69 negociatingCaps bool
70 capVersion int
71 caps map[string]bool
72
73 saslServer sasl.Server
74}
75
76func newDownstreamConn(srv *Server, netConn net.Conn, id uint64) *downstreamConn {
77 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())}
78 dc := &downstreamConn{
79 conn: *newConn(srv, netConn, logger),
80 id: id,
81 caps: make(map[string]bool),
82 }
83 dc.hostname = netConn.RemoteAddr().String()
84 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
85 dc.hostname = host
86 }
87 return dc
88}
89
90func (dc *downstreamConn) prefix() *irc.Prefix {
91 return &irc.Prefix{
92 Name: dc.nick,
93 User: dc.user.Username,
94 Host: dc.hostname,
95 }
96}
97
98func (dc *downstreamConn) forEachNetwork(f func(*network)) {
99 if dc.network != nil {
100 f(dc.network)
101 } else {
102 dc.user.forEachNetwork(f)
103 }
104}
105
106func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
107 dc.user.forEachUpstream(func(uc *upstreamConn) {
108 if dc.network != nil && uc.network != dc.network {
109 return
110 }
111 f(uc)
112 })
113}
114
115// upstream returns the upstream connection, if any. If there are zero or if
116// there are multiple upstream connections, it returns nil.
117func (dc *downstreamConn) upstream() *upstreamConn {
118 if dc.network == nil {
119 return nil
120 }
121 return dc.network.upstream()
122}
123
124// marshalEntity converts an upstream entity name (ie. channel or nick) into a
125// downstream entity name.
126//
127// This involves adding a "/<network>" suffix if the entity isn't the current
128// user.
129func (dc *downstreamConn) marshalEntity(uc *upstreamConn, name string) string {
130 if dc.network != nil {
131 if dc.network != uc.network {
132 panic("soju: tried to marshal an entity for another network")
133 }
134 return name
135 }
136 if name == uc.nick {
137 return dc.nick
138 }
139 return name + "/" + uc.network.GetName()
140}
141
142func (dc *downstreamConn) marshalUserPrefix(uc *upstreamConn, prefix *irc.Prefix) *irc.Prefix {
143 if prefix.Name == uc.nick {
144 return dc.prefix()
145 }
146 if dc.network != nil {
147 if dc.network != uc.network {
148 panic("soju: tried to marshal a user prefix for another network")
149 }
150 return prefix
151 }
152 return &irc.Prefix{
153 Name: prefix.Name + "/" + uc.network.GetName(),
154 User: prefix.User,
155 Host: prefix.Host,
156 }
157}
158
159// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
160// an upstream entity name.
161//
162// This involves removing the "/<network>" suffix.
163func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
164 if uc := dc.upstream(); uc != nil {
165 return uc, name, nil
166 }
167
168 var conn *upstreamConn
169 if i := strings.LastIndexByte(name, '/'); i >= 0 {
170 network := name[i+1:]
171 name = name[:i]
172
173 dc.forEachUpstream(func(uc *upstreamConn) {
174 if network != uc.network.GetName() {
175 return
176 }
177 conn = uc
178 })
179 }
180
181 if conn == nil {
182 return nil, "", ircError{&irc.Message{
183 Command: irc.ERR_NOSUCHCHANNEL,
184 Params: []string{name, "No such channel"},
185 }}
186 }
187 return conn, name, nil
188}
189
190func (dc *downstreamConn) readMessages(ch chan<- event) error {
191 for {
192 msg, err := dc.ReadMessage()
193 if err == io.EOF {
194 break
195 } else if err != nil {
196 return fmt.Errorf("failed to read IRC command: %v", err)
197 }
198
199 ch <- eventDownstreamMessage{msg, dc}
200 }
201
202 return nil
203}
204
205// SendMessage sends an outgoing message.
206//
207// This can only called from the user goroutine.
208func (dc *downstreamConn) SendMessage(msg *irc.Message) {
209 if !dc.caps["message-tags"] {
210 msg = msg.Copy()
211 for name := range msg.Tags {
212 supported := false
213 switch name {
214 case "time":
215 supported = dc.caps["server-time"]
216 }
217 if !supported {
218 delete(msg.Tags, name)
219 }
220 }
221 }
222
223 dc.conn.SendMessage(msg)
224}
225
226// marshalMessage re-formats a message coming from an upstream connection so
227// that it's suitable for being sent on this downstream connection. Only
228// messages that may appear in logs are supported.
229func (dc *downstreamConn) marshalMessage(msg *irc.Message, uc *upstreamConn) *irc.Message {
230 msg = msg.Copy()
231 msg.Prefix = dc.marshalUserPrefix(uc, msg.Prefix)
232
233 switch msg.Command {
234 case "PRIVMSG", "NOTICE":
235 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
236 case "NICK":
237 // Nick change for another user
238 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
239 case "JOIN", "PART":
240 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
241 case "KICK":
242 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
243 msg.Params[1] = dc.marshalEntity(uc, msg.Params[1])
244 case "TOPIC":
245 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
246 case "MODE":
247 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
248 case "QUIT":
249 // This space is intentinally left blank
250 default:
251 panic(fmt.Sprintf("unexpected %q message", msg.Command))
252 }
253
254 return msg
255}
256
257func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
258 switch msg.Command {
259 case "QUIT":
260 return dc.Close()
261 default:
262 if dc.registered {
263 return dc.handleMessageRegistered(msg)
264 } else {
265 return dc.handleMessageUnregistered(msg)
266 }
267 }
268}
269
270func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
271 switch msg.Command {
272 case "NICK":
273 var nick string
274 if err := parseMessageParams(msg, &nick); err != nil {
275 return err
276 }
277 if nick == serviceNick {
278 return ircError{&irc.Message{
279 Command: irc.ERR_NICKNAMEINUSE,
280 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
281 }}
282 }
283 dc.nick = nick
284 case "USER":
285 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
286 return err
287 }
288 case "PASS":
289 if err := parseMessageParams(msg, &dc.password); err != nil {
290 return err
291 }
292 case "CAP":
293 var subCmd string
294 if err := parseMessageParams(msg, &subCmd); err != nil {
295 return err
296 }
297 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
298 return err
299 }
300 case "AUTHENTICATE":
301 if !dc.caps["sasl"] {
302 return ircError{&irc.Message{
303 Command: irc.ERR_SASLFAIL,
304 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
305 }}
306 }
307 if len(msg.Params) == 0 {
308 return ircError{&irc.Message{
309 Command: irc.ERR_SASLFAIL,
310 Params: []string{"*", "Missing AUTHENTICATE argument"},
311 }}
312 }
313 if dc.nick == "" {
314 return ircError{&irc.Message{
315 Command: irc.ERR_SASLFAIL,
316 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
317 }}
318 }
319
320 var resp []byte
321 if dc.saslServer == nil {
322 mech := strings.ToUpper(msg.Params[0])
323 switch mech {
324 case "PLAIN":
325 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
326 return dc.authenticate(username, password)
327 }))
328 default:
329 return ircError{&irc.Message{
330 Command: irc.ERR_SASLFAIL,
331 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
332 }}
333 }
334 } else if msg.Params[0] == "*" {
335 dc.saslServer = nil
336 return ircError{&irc.Message{
337 Command: irc.ERR_SASLABORTED,
338 Params: []string{"*", "SASL authentication aborted"},
339 }}
340 } else if msg.Params[0] == "+" {
341 resp = nil
342 } else {
343 // TODO: multi-line messages
344 var err error
345 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
346 if err != nil {
347 dc.saslServer = nil
348 return ircError{&irc.Message{
349 Command: irc.ERR_SASLFAIL,
350 Params: []string{"*", "Invalid base64-encoded response"},
351 }}
352 }
353 }
354
355 challenge, done, err := dc.saslServer.Next(resp)
356 if err != nil {
357 dc.saslServer = nil
358 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
359 return ircError{&irc.Message{
360 Command: irc.ERR_SASLFAIL,
361 Params: []string{"*", ircErr.Message.Params[1]},
362 }}
363 }
364 dc.SendMessage(&irc.Message{
365 Prefix: dc.srv.prefix(),
366 Command: irc.ERR_SASLFAIL,
367 Params: []string{"*", "SASL error"},
368 })
369 return fmt.Errorf("SASL authentication failed: %v", err)
370 } else if done {
371 dc.saslServer = nil
372 dc.SendMessage(&irc.Message{
373 Prefix: dc.srv.prefix(),
374 Command: irc.RPL_LOGGEDIN,
375 Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
376 })
377 dc.SendMessage(&irc.Message{
378 Prefix: dc.srv.prefix(),
379 Command: irc.RPL_SASLSUCCESS,
380 Params: []string{dc.nick, "SASL authentication successful"},
381 })
382 } else {
383 challengeStr := "+"
384 if len(challenge) > 0 {
385 challengeStr = base64.StdEncoding.EncodeToString(challenge)
386 }
387
388 // TODO: multi-line messages
389 dc.SendMessage(&irc.Message{
390 Prefix: dc.srv.prefix(),
391 Command: "AUTHENTICATE",
392 Params: []string{challengeStr},
393 })
394 }
395 default:
396 dc.logger.Printf("unhandled message: %v", msg)
397 return newUnknownCommandError(msg.Command)
398 }
399 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
400 return dc.register()
401 }
402 return nil
403}
404
405func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
406 cmd = strings.ToUpper(cmd)
407
408 replyTo := dc.nick
409 if !dc.registered {
410 replyTo = "*"
411 }
412
413 switch cmd {
414 case "LS":
415 if len(args) > 0 {
416 var err error
417 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
418 return err
419 }
420 }
421
422 caps := []string{"message-tags", "server-time", "echo-message", "batch"}
423
424 if dc.capVersion >= 302 {
425 caps = append(caps, "sasl=PLAIN")
426 } else {
427 caps = append(caps, "sasl")
428 }
429
430 // TODO: multi-line replies
431 dc.SendMessage(&irc.Message{
432 Prefix: dc.srv.prefix(),
433 Command: "CAP",
434 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
435 })
436
437 if !dc.registered {
438 dc.negociatingCaps = true
439 }
440 case "LIST":
441 var caps []string
442 for name := range dc.caps {
443 caps = append(caps, name)
444 }
445
446 // TODO: multi-line replies
447 dc.SendMessage(&irc.Message{
448 Prefix: dc.srv.prefix(),
449 Command: "CAP",
450 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
451 })
452 case "REQ":
453 if len(args) == 0 {
454 return ircError{&irc.Message{
455 Command: err_invalidcapcmd,
456 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
457 }}
458 }
459
460 caps := strings.Fields(args[0])
461 ack := true
462 for _, name := range caps {
463 name = strings.ToLower(name)
464 enable := !strings.HasPrefix(name, "-")
465 if !enable {
466 name = strings.TrimPrefix(name, "-")
467 }
468
469 enabled := dc.caps[name]
470 if enable == enabled {
471 continue
472 }
473
474 switch name {
475 case "sasl", "message-tags", "server-time", "echo-message", "batch":
476 dc.caps[name] = enable
477 default:
478 ack = false
479 }
480 }
481
482 reply := "NAK"
483 if ack {
484 reply = "ACK"
485 }
486 dc.SendMessage(&irc.Message{
487 Prefix: dc.srv.prefix(),
488 Command: "CAP",
489 Params: []string{replyTo, reply, args[0]},
490 })
491 case "END":
492 dc.negociatingCaps = false
493 default:
494 return ircError{&irc.Message{
495 Command: err_invalidcapcmd,
496 Params: []string{replyTo, cmd, "Unknown CAP command"},
497 }}
498 }
499 return nil
500}
501
502func sanityCheckServer(addr string) error {
503 dialer := net.Dialer{Timeout: 30 * time.Second}
504 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
505 if err != nil {
506 return err
507 }
508 return conn.Close()
509}
510
511func unmarshalUsername(rawUsername string) (username, client, network string) {
512 username = rawUsername
513
514 i := strings.IndexAny(username, "/@")
515 j := strings.LastIndexAny(username, "/@")
516 if i >= 0 {
517 username = rawUsername[:i]
518 }
519 if j >= 0 {
520 if rawUsername[j] == '@' {
521 client = rawUsername[j+1:]
522 } else {
523 network = rawUsername[j+1:]
524 }
525 }
526 if i >= 0 && j >= 0 && i < j {
527 if rawUsername[i] == '@' {
528 client = rawUsername[i+1 : j]
529 } else {
530 network = rawUsername[i+1 : j]
531 }
532 }
533
534 return username, client, network
535}
536
537func (dc *downstreamConn) authenticate(username, password string) error {
538 username, clientName, networkName := unmarshalUsername(username)
539
540 u, err := dc.srv.db.GetUser(username)
541 if err != nil {
542 dc.logger.Printf("failed authentication for %q: %v", username, err)
543 return errAuthFailed
544 }
545
546 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
547 if err != nil {
548 dc.logger.Printf("failed authentication for %q: %v", username, err)
549 return errAuthFailed
550 }
551
552 dc.user = dc.srv.getUser(username)
553 if dc.user == nil {
554 dc.logger.Printf("failed authentication for %q: user not active", username)
555 return errAuthFailed
556 }
557 dc.clientName = clientName
558 dc.networkName = networkName
559 return nil
560}
561
562func (dc *downstreamConn) register() error {
563 if dc.registered {
564 return fmt.Errorf("tried to register twice")
565 }
566
567 password := dc.password
568 dc.password = ""
569 if dc.user == nil {
570 if err := dc.authenticate(dc.rawUsername, password); err != nil {
571 return err
572 }
573 }
574
575 if dc.clientName == "" && dc.networkName == "" {
576 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
577 }
578
579 dc.registered = true
580 dc.logger.Printf("registration complete for user %q", dc.user.Username)
581 return nil
582}
583
584func (dc *downstreamConn) loadNetwork() error {
585 if dc.networkName == "" {
586 return nil
587 }
588
589 network := dc.user.getNetwork(dc.networkName)
590 if network == nil {
591 addr := dc.networkName
592 if !strings.ContainsRune(addr, ':') {
593 addr = addr + ":6697"
594 }
595
596 dc.logger.Printf("trying to connect to new network %q", addr)
597 if err := sanityCheckServer(addr); err != nil {
598 dc.logger.Printf("failed to connect to %q: %v", addr, err)
599 return ircError{&irc.Message{
600 Command: irc.ERR_PASSWDMISMATCH,
601 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
602 }}
603 }
604
605 dc.logger.Printf("auto-saving network %q", dc.networkName)
606 var err error
607 network, err = dc.user.createNetwork(&Network{
608 Addr: dc.networkName,
609 Nick: dc.nick,
610 })
611 if err != nil {
612 return err
613 }
614 }
615
616 dc.network = network
617 return nil
618}
619
620func (dc *downstreamConn) welcome() error {
621 if dc.user == nil || !dc.registered {
622 panic("tried to welcome an unregistered connection")
623 }
624
625 // TODO: doing this might take some time. We should do it in dc.register
626 // instead, but we'll potentially be adding a new network and this must be
627 // done in the user goroutine.
628 if err := dc.loadNetwork(); err != nil {
629 return err
630 }
631
632 dc.SendMessage(&irc.Message{
633 Prefix: dc.srv.prefix(),
634 Command: irc.RPL_WELCOME,
635 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
636 })
637 dc.SendMessage(&irc.Message{
638 Prefix: dc.srv.prefix(),
639 Command: irc.RPL_YOURHOST,
640 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
641 })
642 dc.SendMessage(&irc.Message{
643 Prefix: dc.srv.prefix(),
644 Command: irc.RPL_CREATED,
645 Params: []string{dc.nick, "Who cares when the server was created?"},
646 })
647 dc.SendMessage(&irc.Message{
648 Prefix: dc.srv.prefix(),
649 Command: irc.RPL_MYINFO,
650 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
651 })
652 // TODO: RPL_ISUPPORT
653 dc.SendMessage(&irc.Message{
654 Prefix: dc.srv.prefix(),
655 Command: irc.ERR_NOMOTD,
656 Params: []string{dc.nick, "No MOTD"},
657 })
658
659 dc.forEachUpstream(func(uc *upstreamConn) {
660 for _, ch := range uc.channels {
661 if ch.complete {
662 dc.SendMessage(&irc.Message{
663 Prefix: dc.prefix(),
664 Command: "JOIN",
665 Params: []string{dc.marshalEntity(ch.conn, ch.Name)},
666 })
667
668 forwardChannel(dc, ch)
669 }
670 }
671 })
672
673 dc.forEachNetwork(func(net *network) {
674 // Only send history if we're the first connected client with that name
675 // for the network
676 if _, ok := net.offlineClients[dc.clientName]; ok {
677 dc.sendNetworkHistory(net)
678 delete(net.offlineClients, dc.clientName)
679 }
680 })
681
682 return nil
683}
684
685func (dc *downstreamConn) sendNetworkHistory(net *network) {
686 for target, history := range net.history {
687 seq, ok := history.offlineClients[dc.clientName]
688 if !ok {
689 continue
690 }
691 delete(history.offlineClients, dc.clientName)
692
693 // If all clients have received history, no need to keep the
694 // ring buffer around
695 if len(history.offlineClients) == 0 {
696 delete(net.history, target)
697 }
698
699 consumer := history.ring.NewConsumer(seq)
700
701 // TODO: this means all history is lost when trying to send it while the
702 // upstream is disconnected. We need to store history differently so that
703 // we don't need access to upstreamConn to forward it to a downstream
704 // client.
705 uc := net.upstream()
706 if uc == nil {
707 dc.logger.Printf("ignoring messages for upstream %q: upstream is disconnected", net.Addr)
708 return
709 }
710
711 batchRef := "history"
712 if dc.caps["batch"] {
713 dc.SendMessage(&irc.Message{
714 Prefix: dc.srv.prefix(),
715 Command: "BATCH",
716 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(uc, target)},
717 })
718 }
719
720 for {
721 msg := consumer.Consume()
722 if msg == nil {
723 break
724 }
725
726 // Don't replay all messages, because that would mess up client
727 // state. For instance we just sent the list of users, sending
728 // PART messages for one of these users would be incorrect.
729 ignore := true
730 switch msg.Command {
731 case "PRIVMSG", "NOTICE":
732 ignore = false
733 }
734 if ignore {
735 continue
736 }
737
738 if dc.caps["batch"] {
739 msg = msg.Copy()
740 msg.Tags["batch"] = irc.TagValue(batchRef)
741 }
742
743 dc.SendMessage(dc.marshalMessage(msg, uc))
744 }
745
746 if dc.caps["batch"] {
747 dc.SendMessage(&irc.Message{
748 Prefix: dc.srv.prefix(),
749 Command: "BATCH",
750 Params: []string{"-" + batchRef},
751 })
752 }
753 }
754}
755
756func (dc *downstreamConn) runUntilRegistered() error {
757 for !dc.registered {
758 msg, err := dc.ReadMessage()
759 if err != nil {
760 return fmt.Errorf("failed to read IRC command: %v", err)
761 }
762
763 err = dc.handleMessage(msg)
764 if ircErr, ok := err.(ircError); ok {
765 ircErr.Message.Prefix = dc.srv.prefix()
766 dc.SendMessage(ircErr.Message)
767 } else if err != nil {
768 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
769 }
770 }
771
772 return nil
773}
774
775func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
776 switch msg.Command {
777 case "CAP":
778 var subCmd string
779 if err := parseMessageParams(msg, &subCmd); err != nil {
780 return err
781 }
782 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
783 return err
784 }
785 case "PING":
786 dc.SendMessage(&irc.Message{
787 Prefix: dc.srv.prefix(),
788 Command: "PONG",
789 Params: msg.Params,
790 })
791 return nil
792 case "USER":
793 return ircError{&irc.Message{
794 Command: irc.ERR_ALREADYREGISTERED,
795 Params: []string{dc.nick, "You may not reregister"},
796 }}
797 case "NICK":
798 var nick string
799 if err := parseMessageParams(msg, &nick); err != nil {
800 return err
801 }
802
803 var err error
804 dc.forEachNetwork(func(n *network) {
805 if err != nil {
806 return
807 }
808 n.Nick = nick
809 err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
810 })
811 if err != nil {
812 return err
813 }
814
815 dc.forEachUpstream(func(uc *upstreamConn) {
816 uc.SendMessage(msg)
817 })
818 case "JOIN":
819 var namesStr string
820 if err := parseMessageParams(msg, &namesStr); err != nil {
821 return err
822 }
823
824 var keys []string
825 if len(msg.Params) > 1 {
826 keys = strings.Split(msg.Params[1], ",")
827 }
828
829 for i, name := range strings.Split(namesStr, ",") {
830 uc, upstreamName, err := dc.unmarshalEntity(name)
831 if err != nil {
832 return err
833 }
834
835 var key string
836 if len(keys) > i {
837 key = keys[i]
838 }
839
840 params := []string{upstreamName}
841 if key != "" {
842 params = append(params, key)
843 }
844 uc.SendMessage(&irc.Message{
845 Command: "JOIN",
846 Params: params,
847 })
848
849 ch := &Channel{Name: upstreamName, Key: key}
850 if err := uc.network.createUpdateChannel(ch); err != nil {
851 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
852 }
853 }
854 case "PART":
855 var namesStr string
856 if err := parseMessageParams(msg, &namesStr); err != nil {
857 return err
858 }
859
860 var reason string
861 if len(msg.Params) > 1 {
862 reason = msg.Params[1]
863 }
864
865 for _, name := range strings.Split(namesStr, ",") {
866 uc, upstreamName, err := dc.unmarshalEntity(name)
867 if err != nil {
868 return err
869 }
870
871 params := []string{upstreamName}
872 if reason != "" {
873 params = append(params, reason)
874 }
875 uc.SendMessage(&irc.Message{
876 Command: "PART",
877 Params: params,
878 })
879
880 if err := uc.network.deleteChannel(upstreamName); err != nil {
881 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
882 }
883 }
884 case "KICK":
885 var channelStr, userStr string
886 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
887 return err
888 }
889
890 channels := strings.Split(channelStr, ",")
891 users := strings.Split(userStr, ",")
892
893 var reason string
894 if len(msg.Params) > 2 {
895 reason = msg.Params[2]
896 }
897
898 if len(channels) != 1 && len(channels) != len(users) {
899 return ircError{&irc.Message{
900 Command: irc.ERR_BADCHANMASK,
901 Params: []string{dc.nick, channelStr, "Bad channel mask"},
902 }}
903 }
904
905 for i, user := range users {
906 var channel string
907 if len(channels) == 1 {
908 channel = channels[0]
909 } else {
910 channel = channels[i]
911 }
912
913 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
914 if err != nil {
915 return err
916 }
917
918 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
919 if err != nil {
920 return err
921 }
922
923 if ucChannel != ucUser {
924 return ircError{&irc.Message{
925 Command: irc.ERR_USERNOTINCHANNEL,
926 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
927 }}
928 }
929 uc := ucChannel
930
931 params := []string{upstreamChannel, upstreamUser}
932 if reason != "" {
933 params = append(params, reason)
934 }
935 uc.SendMessage(&irc.Message{
936 Command: "KICK",
937 Params: params,
938 })
939 }
940 case "MODE":
941 var name string
942 if err := parseMessageParams(msg, &name); err != nil {
943 return err
944 }
945
946 var modeStr string
947 if len(msg.Params) > 1 {
948 modeStr = msg.Params[1]
949 }
950
951 if name == dc.nick {
952 if modeStr != "" {
953 dc.forEachUpstream(func(uc *upstreamConn) {
954 uc.SendMessage(&irc.Message{
955 Command: "MODE",
956 Params: []string{uc.nick, modeStr},
957 })
958 })
959 } else {
960 dc.SendMessage(&irc.Message{
961 Prefix: dc.srv.prefix(),
962 Command: irc.RPL_UMODEIS,
963 Params: []string{dc.nick, ""}, // TODO
964 })
965 }
966 return nil
967 }
968
969 uc, upstreamName, err := dc.unmarshalEntity(name)
970 if err != nil {
971 return err
972 }
973
974 if !uc.isChannel(upstreamName) {
975 return ircError{&irc.Message{
976 Command: irc.ERR_USERSDONTMATCH,
977 Params: []string{dc.nick, "Cannot change mode for other users"},
978 }}
979 }
980
981 if modeStr != "" {
982 params := []string{upstreamName, modeStr}
983 params = append(params, msg.Params[2:]...)
984 uc.SendMessage(&irc.Message{
985 Command: "MODE",
986 Params: params,
987 })
988 } else {
989 ch, ok := uc.channels[upstreamName]
990 if !ok {
991 return ircError{&irc.Message{
992 Command: irc.ERR_NOSUCHCHANNEL,
993 Params: []string{dc.nick, name, "No such channel"},
994 }}
995 }
996
997 if ch.modes == nil {
998 // we haven't received the initial RPL_CHANNELMODEIS yet
999 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1000 return nil
1001 }
1002
1003 modeStr, modeParams := ch.modes.Format()
1004 params := []string{dc.nick, name, modeStr}
1005 params = append(params, modeParams...)
1006
1007 dc.SendMessage(&irc.Message{
1008 Prefix: dc.srv.prefix(),
1009 Command: irc.RPL_CHANNELMODEIS,
1010 Params: params,
1011 })
1012 if ch.creationTime != "" {
1013 dc.SendMessage(&irc.Message{
1014 Prefix: dc.srv.prefix(),
1015 Command: rpl_creationtime,
1016 Params: []string{dc.nick, name, ch.creationTime},
1017 })
1018 }
1019 }
1020 case "TOPIC":
1021 var channel string
1022 if err := parseMessageParams(msg, &channel); err != nil {
1023 return err
1024 }
1025
1026 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1027 if err != nil {
1028 return err
1029 }
1030
1031 if len(msg.Params) > 1 { // setting topic
1032 topic := msg.Params[1]
1033 uc.SendMessage(&irc.Message{
1034 Command: "TOPIC",
1035 Params: []string{upstreamChannel, topic},
1036 })
1037 } else { // getting topic
1038 ch, ok := uc.channels[upstreamChannel]
1039 if !ok {
1040 return ircError{&irc.Message{
1041 Command: irc.ERR_NOSUCHCHANNEL,
1042 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1043 }}
1044 }
1045 sendTopic(dc, ch)
1046 }
1047 case "LIST":
1048 // TODO: support ELIST when supported by all upstreams
1049
1050 pl := pendingLIST{
1051 downstreamID: dc.id,
1052 pendingCommands: make(map[int64]*irc.Message),
1053 }
1054 var upstreamChannels map[int64][]string
1055 if len(msg.Params) > 0 {
1056 upstreamChannels = make(map[int64][]string)
1057 channels := strings.Split(msg.Params[0], ",")
1058 for _, channel := range channels {
1059 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1060 if err != nil {
1061 return err
1062 }
1063 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1064 }
1065 }
1066
1067 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1068 dc.forEachUpstream(func(uc *upstreamConn) {
1069 var params []string
1070 if upstreamChannels != nil {
1071 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1072 params = []string{strings.Join(channels, ",")}
1073 } else {
1074 return
1075 }
1076 }
1077 pl.pendingCommands[uc.network.ID] = &irc.Message{
1078 Command: "LIST",
1079 Params: params,
1080 }
1081 uc.trySendLIST(dc.id)
1082 })
1083 case "NAMES":
1084 if len(msg.Params) == 0 {
1085 dc.SendMessage(&irc.Message{
1086 Prefix: dc.srv.prefix(),
1087 Command: irc.RPL_ENDOFNAMES,
1088 Params: []string{dc.nick, "*", "End of /NAMES list"},
1089 })
1090 return nil
1091 }
1092
1093 channels := strings.Split(msg.Params[0], ",")
1094 for _, channel := range channels {
1095 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1096 if err != nil {
1097 return err
1098 }
1099
1100 ch, ok := uc.channels[upstreamChannel]
1101 if ok {
1102 sendNames(dc, ch)
1103 } else {
1104 // NAMES on a channel we have not joined, ask upstream
1105 uc.SendMessageLabeled(dc.id, &irc.Message{
1106 Command: "NAMES",
1107 Params: []string{upstreamChannel},
1108 })
1109 }
1110 }
1111 case "WHO":
1112 if len(msg.Params) == 0 {
1113 // TODO: support WHO without parameters
1114 dc.SendMessage(&irc.Message{
1115 Prefix: dc.srv.prefix(),
1116 Command: irc.RPL_ENDOFWHO,
1117 Params: []string{dc.nick, "*", "End of /WHO list"},
1118 })
1119 return nil
1120 }
1121
1122 // TODO: support WHO masks
1123 entity := msg.Params[0]
1124
1125 if entity == dc.nick {
1126 // TODO: support AWAY (H/G) in self WHO reply
1127 dc.SendMessage(&irc.Message{
1128 Prefix: dc.srv.prefix(),
1129 Command: irc.RPL_WHOREPLY,
1130 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1131 })
1132 dc.SendMessage(&irc.Message{
1133 Prefix: dc.srv.prefix(),
1134 Command: irc.RPL_ENDOFWHO,
1135 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1136 })
1137 return nil
1138 }
1139
1140 uc, upstreamName, err := dc.unmarshalEntity(entity)
1141 if err != nil {
1142 return err
1143 }
1144
1145 var params []string
1146 if len(msg.Params) == 2 {
1147 params = []string{upstreamName, msg.Params[1]}
1148 } else {
1149 params = []string{upstreamName}
1150 }
1151
1152 uc.SendMessageLabeled(dc.id, &irc.Message{
1153 Command: "WHO",
1154 Params: params,
1155 })
1156 case "WHOIS":
1157 if len(msg.Params) == 0 {
1158 return ircError{&irc.Message{
1159 Command: irc.ERR_NONICKNAMEGIVEN,
1160 Params: []string{dc.nick, "No nickname given"},
1161 }}
1162 }
1163
1164 var target, mask string
1165 if len(msg.Params) == 1 {
1166 target = ""
1167 mask = msg.Params[0]
1168 } else {
1169 target = msg.Params[0]
1170 mask = msg.Params[1]
1171 }
1172 // TODO: support multiple WHOIS users
1173 if i := strings.IndexByte(mask, ','); i >= 0 {
1174 mask = mask[:i]
1175 }
1176
1177 if mask == dc.nick {
1178 dc.SendMessage(&irc.Message{
1179 Prefix: dc.srv.prefix(),
1180 Command: irc.RPL_WHOISUSER,
1181 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1182 })
1183 dc.SendMessage(&irc.Message{
1184 Prefix: dc.srv.prefix(),
1185 Command: irc.RPL_WHOISSERVER,
1186 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1187 })
1188 dc.SendMessage(&irc.Message{
1189 Prefix: dc.srv.prefix(),
1190 Command: irc.RPL_ENDOFWHOIS,
1191 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1192 })
1193 return nil
1194 }
1195
1196 // TODO: support WHOIS masks
1197 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1198 if err != nil {
1199 return err
1200 }
1201
1202 var params []string
1203 if target != "" {
1204 params = []string{target, upstreamNick}
1205 } else {
1206 params = []string{upstreamNick}
1207 }
1208
1209 uc.SendMessageLabeled(dc.id, &irc.Message{
1210 Command: "WHOIS",
1211 Params: params,
1212 })
1213 case "PRIVMSG":
1214 var targetsStr, text string
1215 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1216 return err
1217 }
1218
1219 for _, name := range strings.Split(targetsStr, ",") {
1220 if name == serviceNick {
1221 handleServicePRIVMSG(dc, text)
1222 continue
1223 }
1224
1225 uc, upstreamName, err := dc.unmarshalEntity(name)
1226 if err != nil {
1227 return err
1228 }
1229
1230 if upstreamName == "NickServ" {
1231 dc.handleNickServPRIVMSG(uc, text)
1232 }
1233
1234 uc.SendMessage(&irc.Message{
1235 Command: "PRIVMSG",
1236 Params: []string{upstreamName, text},
1237 })
1238
1239 echoMsg := &irc.Message{
1240 Prefix: &irc.Prefix{
1241 Name: uc.nick,
1242 User: uc.username,
1243 },
1244 Command: "PRIVMSG",
1245 Params: []string{upstreamName, text},
1246 }
1247
1248 uc.produce(upstreamName, echoMsg, dc)
1249 }
1250 case "NOTICE":
1251 var targetsStr, text string
1252 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1253 return err
1254 }
1255
1256 for _, name := range strings.Split(targetsStr, ",") {
1257 uc, upstreamName, err := dc.unmarshalEntity(name)
1258 if err != nil {
1259 return err
1260 }
1261
1262 uc.SendMessage(&irc.Message{
1263 Command: "NOTICE",
1264 Params: []string{upstreamName, text},
1265 })
1266 }
1267 case "INVITE":
1268 var user, channel string
1269 if err := parseMessageParams(msg, &user, &channel); err != nil {
1270 return err
1271 }
1272
1273 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1274 if err != nil {
1275 return err
1276 }
1277
1278 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1279 if err != nil {
1280 return err
1281 }
1282
1283 if ucChannel != ucUser {
1284 return ircError{&irc.Message{
1285 Command: irc.ERR_USERNOTINCHANNEL,
1286 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
1287 }}
1288 }
1289 uc := ucChannel
1290
1291 uc.SendMessageLabeled(dc.id, &irc.Message{
1292 Command: "INVITE",
1293 Params: []string{upstreamUser, upstreamChannel},
1294 })
1295 default:
1296 dc.logger.Printf("unhandled message: %v", msg)
1297 return newUnknownCommandError(msg.Command)
1298 }
1299 return nil
1300}
1301
1302func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1303 username, password, ok := parseNickServCredentials(text, uc.nick)
1304 if !ok {
1305 return
1306 }
1307
1308 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1309 n := uc.network
1310 n.SASL.Mechanism = "PLAIN"
1311 n.SASL.Plain.Username = username
1312 n.SASL.Plain.Password = password
1313 if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
1314 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1315 }
1316}
1317
1318func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1319 fields := strings.Fields(text)
1320 if len(fields) < 2 {
1321 return "", "", false
1322 }
1323 cmd := strings.ToUpper(fields[0])
1324 params := fields[1:]
1325 switch cmd {
1326 case "REGISTER":
1327 username = nick
1328 password = params[0]
1329 case "IDENTIFY":
1330 if len(params) == 1 {
1331 username = nick
1332 password = params[0]
1333 } else {
1334 username = params[0]
1335 password = params[1]
1336 }
1337 case "SET":
1338 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1339 username = nick
1340 password = params[1]
1341 }
1342 }
1343 return username, password, true
1344}
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