source: code/trunk/downstream.go@ 161

Last change on this file since 161 was 160, checked in by delthas, 5 years ago

Add downstream TOPIC support
File size: 28.6 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "sync"
12 "time"
13
14 "github.com/emersion/go-sasl"
15 "golang.org/x/crypto/bcrypt"
16 "gopkg.in/irc.v3"
17)
18
19type ircError struct {
20 Message *irc.Message
21}
22
23func (err ircError) Error() string {
24 return err.Message.String()
25}
26
27func newUnknownCommandError(cmd string) ircError {
28 return ircError{&irc.Message{
29 Command: irc.ERR_UNKNOWNCOMMAND,
30 Params: []string{
31 "*",
32 cmd,
33 "Unknown command",
34 },
35 }}
36}
37
38func newNeedMoreParamsError(cmd string) ircError {
39 return ircError{&irc.Message{
40 Command: irc.ERR_NEEDMOREPARAMS,
41 Params: []string{
42 "*",
43 cmd,
44 "Not enough parameters",
45 },
46 }}
47}
48
49var errAuthFailed = ircError{&irc.Message{
50 Command: irc.ERR_PASSWDMISMATCH,
51 Params: []string{"*", "Invalid username or password"},
52}}
53
54type ringMessage struct {
55 consumer *RingConsumer
56 upstreamConn *upstreamConn
57}
58
59type downstreamConn struct {
60 id uint64
61 net net.Conn
62 irc *irc.Conn
63 srv *Server
64 logger Logger
65 outgoing chan *irc.Message
66 ringMessages chan ringMessage
67 closed chan struct{}
68
69 registered bool
70 user *user
71 nick string
72 username string
73 rawUsername string
74 realname string
75 hostname string
76 password string // empty after authentication
77 network *network // can be nil
78
79 negociatingCaps bool
80 capVersion int
81 caps map[string]bool
82
83 saslServer sasl.Server
84
85 lock sync.Mutex
86 ourMessages map[*irc.Message]struct{}
87}
88
89func newDownstreamConn(srv *Server, netConn net.Conn, id uint64) *downstreamConn {
90 dc := &downstreamConn{
91 id: id,
92 net: netConn,
93 irc: irc.NewConn(netConn),
94 srv: srv,
95 logger: &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())},
96 outgoing: make(chan *irc.Message, 64),
97 ringMessages: make(chan ringMessage),
98 closed: make(chan struct{}),
99 caps: make(map[string]bool),
100 ourMessages: make(map[*irc.Message]struct{}),
101 }
102 dc.hostname = netConn.RemoteAddr().String()
103 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
104 dc.hostname = host
105 }
106
107 go func() {
108 if err := dc.writeMessages(); err != nil {
109 dc.logger.Printf("failed to write message: %v", err)
110 }
111 if err := dc.net.Close(); err != nil {
112 dc.logger.Printf("failed to close connection: %v", err)
113 } else {
114 dc.logger.Printf("connection closed")
115 }
116 }()
117
118 dc.logger.Printf("new connection")
119 return dc
120}
121
122func (dc *downstreamConn) prefix() *irc.Prefix {
123 return &irc.Prefix{
124 Name: dc.nick,
125 User: dc.username,
126 Host: dc.hostname,
127 }
128}
129
130func (dc *downstreamConn) forEachNetwork(f func(*network)) {
131 if dc.network != nil {
132 f(dc.network)
133 } else {
134 dc.user.forEachNetwork(f)
135 }
136}
137
138func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
139 dc.user.forEachUpstream(func(uc *upstreamConn) {
140 if dc.network != nil && uc.network != dc.network {
141 return
142 }
143 f(uc)
144 })
145}
146
147// upstream returns the upstream connection, if any. If there are zero or if
148// there are multiple upstream connections, it returns nil.
149func (dc *downstreamConn) upstream() *upstreamConn {
150 if dc.network == nil {
151 return nil
152 }
153 return dc.network.upstream()
154}
155
156func (dc *downstreamConn) marshalEntity(uc *upstreamConn, entity string) string {
157 if uc.isChannel(entity) {
158 return dc.marshalChannel(uc, entity)
159 }
160 return dc.marshalNick(uc, entity)
161}
162
163func (dc *downstreamConn) marshalChannel(uc *upstreamConn, name string) string {
164 if dc.network != nil {
165 return name
166 }
167 return name + "/" + uc.network.GetName()
168}
169
170func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
171 if uc := dc.upstream(); uc != nil {
172 return uc, name, nil
173 }
174
175 var conn *upstreamConn
176 if i := strings.LastIndexByte(name, '/'); i >= 0 {
177 network := name[i+1:]
178 name = name[:i]
179
180 dc.forEachUpstream(func(uc *upstreamConn) {
181 if network != uc.network.GetName() {
182 return
183 }
184 conn = uc
185 })
186 }
187
188 if conn == nil {
189 return nil, "", ircError{&irc.Message{
190 Command: irc.ERR_NOSUCHCHANNEL,
191 Params: []string{name, "No such channel"},
192 }}
193 }
194 return conn, name, nil
195}
196
197func (dc *downstreamConn) marshalNick(uc *upstreamConn, nick string) string {
198 if nick == uc.nick {
199 return dc.nick
200 }
201 if dc.network != nil {
202 return nick
203 }
204 return nick + "/" + uc.network.GetName()
205}
206
207func (dc *downstreamConn) marshalUserPrefix(uc *upstreamConn, prefix *irc.Prefix) *irc.Prefix {
208 if prefix.Name == uc.nick {
209 return dc.prefix()
210 }
211 if dc.network != nil {
212 return prefix
213 }
214 return &irc.Prefix{
215 Name: prefix.Name + "/" + uc.network.GetName(),
216 User: prefix.User,
217 Host: prefix.Host,
218 }
219}
220
221func (dc *downstreamConn) isClosed() bool {
222 select {
223 case <-dc.closed:
224 return true
225 default:
226 return false
227 }
228}
229
230func (dc *downstreamConn) readMessages(ch chan<- downstreamIncomingMessage) error {
231 for {
232 msg, err := dc.irc.ReadMessage()
233 if err == io.EOF {
234 break
235 } else if err != nil {
236 return fmt.Errorf("failed to read IRC command: %v", err)
237 }
238
239 if dc.srv.Debug {
240 dc.logger.Printf("received: %v", msg)
241 }
242
243 ch <- downstreamIncomingMessage{msg, dc}
244 }
245
246 return nil
247}
248
249func (dc *downstreamConn) writeMessages() error {
250 for {
251 var err error
252 var closed bool
253 select {
254 case msg := <-dc.outgoing:
255 if dc.srv.Debug {
256 dc.logger.Printf("sent: %v", msg)
257 }
258 err = dc.irc.WriteMessage(msg)
259 case ringMessage := <-dc.ringMessages:
260 consumer, uc := ringMessage.consumer, ringMessage.upstreamConn
261 for {
262 msg := consumer.Peek()
263 if msg == nil {
264 break
265 }
266
267 dc.lock.Lock()
268 _, ours := dc.ourMessages[msg]
269 delete(dc.ourMessages, msg)
270 dc.lock.Unlock()
271 if ours {
272 // The message comes from our connection, don't echo it
273 // back
274 consumer.Consume()
275 continue
276 }
277
278 msg = msg.Copy()
279 switch msg.Command {
280 case "PRIVMSG":
281 msg.Prefix = dc.marshalUserPrefix(uc, msg.Prefix)
282 msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
283 default:
284 panic("expected to consume a PRIVMSG message")
285 }
286 if dc.srv.Debug {
287 dc.logger.Printf("sent: %v", msg)
288 }
289 err = dc.irc.WriteMessage(msg)
290 if err != nil {
291 break
292 }
293 consumer.Consume()
294 }
295 case <-dc.closed:
296 closed = true
297 }
298 if err != nil {
299 return err
300 }
301 if closed {
302 break
303 }
304 }
305 return nil
306}
307
308func (dc *downstreamConn) Close() error {
309 if dc.isClosed() {
310 return fmt.Errorf("downstream connection already closed")
311 }
312
313 if u := dc.user; u != nil {
314 u.removeDownstream(dc)
315 }
316
317 close(dc.closed)
318 return nil
319}
320
321func (dc *downstreamConn) SendMessage(msg *irc.Message) {
322 dc.outgoing <- msg
323}
324
325func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
326 switch msg.Command {
327 case "QUIT":
328 return dc.Close()
329 default:
330 if dc.registered {
331 return dc.handleMessageRegistered(msg)
332 } else {
333 return dc.handleMessageUnregistered(msg)
334 }
335 }
336}
337
338func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
339 switch msg.Command {
340 case "NICK":
341 var nick string
342 if err := parseMessageParams(msg, &nick); err != nil {
343 return err
344 }
345 if nick == serviceNick {
346 return ircError{&irc.Message{
347 Command: irc.ERR_NICKNAMEINUSE,
348 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
349 }}
350 }
351 dc.nick = nick
352 case "USER":
353 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
354 return err
355 }
356 case "PASS":
357 if err := parseMessageParams(msg, &dc.password); err != nil {
358 return err
359 }
360 case "CAP":
361 var subCmd string
362 if err := parseMessageParams(msg, &subCmd); err != nil {
363 return err
364 }
365 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
366 return err
367 }
368 case "AUTHENTICATE":
369 if !dc.caps["sasl"] {
370 return ircError{&irc.Message{
371 Command: irc.ERR_SASLFAIL,
372 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
373 }}
374 }
375 if len(msg.Params) == 0 {
376 return ircError{&irc.Message{
377 Command: irc.ERR_SASLFAIL,
378 Params: []string{"*", "Missing AUTHENTICATE argument"},
379 }}
380 }
381 if dc.nick == "" {
382 return ircError{&irc.Message{
383 Command: irc.ERR_SASLFAIL,
384 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
385 }}
386 }
387
388 var resp []byte
389 if dc.saslServer == nil {
390 mech := strings.ToUpper(msg.Params[0])
391 switch mech {
392 case "PLAIN":
393 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
394 return dc.authenticate(username, password)
395 }))
396 default:
397 return ircError{&irc.Message{
398 Command: irc.ERR_SASLFAIL,
399 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
400 }}
401 }
402 } else if msg.Params[0] == "*" {
403 dc.saslServer = nil
404 return ircError{&irc.Message{
405 Command: irc.ERR_SASLABORTED,
406 Params: []string{"*", "SASL authentication aborted"},
407 }}
408 } else if msg.Params[0] == "+" {
409 resp = nil
410 } else {
411 // TODO: multi-line messages
412 var err error
413 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
414 if err != nil {
415 dc.saslServer = nil
416 return ircError{&irc.Message{
417 Command: irc.ERR_SASLFAIL,
418 Params: []string{"*", "Invalid base64-encoded response"},
419 }}
420 }
421 }
422
423 challenge, done, err := dc.saslServer.Next(resp)
424 if err != nil {
425 dc.saslServer = nil
426 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
427 return ircError{&irc.Message{
428 Command: irc.ERR_SASLFAIL,
429 Params: []string{"*", ircErr.Message.Params[1]},
430 }}
431 }
432 dc.SendMessage(&irc.Message{
433 Prefix: dc.srv.prefix(),
434 Command: irc.ERR_SASLFAIL,
435 Params: []string{"*", "SASL error"},
436 })
437 return fmt.Errorf("SASL authentication failed: %v", err)
438 } else if done {
439 dc.saslServer = nil
440 dc.SendMessage(&irc.Message{
441 Prefix: dc.srv.prefix(),
442 Command: irc.RPL_LOGGEDIN,
443 Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
444 })
445 dc.SendMessage(&irc.Message{
446 Prefix: dc.srv.prefix(),
447 Command: irc.RPL_SASLSUCCESS,
448 Params: []string{dc.nick, "SASL authentication successful"},
449 })
450 } else {
451 challengeStr := "+"
452 if len(challenge) > 0 {
453 challengeStr = base64.StdEncoding.EncodeToString(challenge)
454 }
455
456 // TODO: multi-line messages
457 dc.SendMessage(&irc.Message{
458 Prefix: dc.srv.prefix(),
459 Command: "AUTHENTICATE",
460 Params: []string{challengeStr},
461 })
462 }
463 default:
464 dc.logger.Printf("unhandled message: %v", msg)
465 return newUnknownCommandError(msg.Command)
466 }
467 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
468 return dc.register()
469 }
470 return nil
471}
472
473func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
474 cmd = strings.ToUpper(cmd)
475
476 replyTo := dc.nick
477 if !dc.registered {
478 replyTo = "*"
479 }
480
481 switch cmd {
482 case "LS":
483 if len(args) > 0 {
484 var err error
485 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
486 return err
487 }
488 }
489
490 var caps []string
491 if dc.capVersion >= 302 {
492 caps = append(caps, "sasl=PLAIN")
493 } else {
494 caps = append(caps, "sasl")
495 }
496
497 // TODO: multi-line replies
498 dc.SendMessage(&irc.Message{
499 Prefix: dc.srv.prefix(),
500 Command: "CAP",
501 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
502 })
503
504 if !dc.registered {
505 dc.negociatingCaps = true
506 }
507 case "LIST":
508 var caps []string
509 for name := range dc.caps {
510 caps = append(caps, name)
511 }
512
513 // TODO: multi-line replies
514 dc.SendMessage(&irc.Message{
515 Prefix: dc.srv.prefix(),
516 Command: "CAP",
517 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
518 })
519 case "REQ":
520 if len(args) == 0 {
521 return ircError{&irc.Message{
522 Command: err_invalidcapcmd,
523 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
524 }}
525 }
526
527 caps := strings.Fields(args[0])
528 ack := true
529 for _, name := range caps {
530 name = strings.ToLower(name)
531 enable := !strings.HasPrefix(name, "-")
532 if !enable {
533 name = strings.TrimPrefix(name, "-")
534 }
535
536 enabled := dc.caps[name]
537 if enable == enabled {
538 continue
539 }
540
541 switch name {
542 case "sasl":
543 dc.caps[name] = enable
544 default:
545 ack = false
546 }
547 }
548
549 reply := "NAK"
550 if ack {
551 reply = "ACK"
552 }
553 dc.SendMessage(&irc.Message{
554 Prefix: dc.srv.prefix(),
555 Command: "CAP",
556 Params: []string{replyTo, reply, args[0]},
557 })
558 case "END":
559 dc.negociatingCaps = false
560 default:
561 return ircError{&irc.Message{
562 Command: err_invalidcapcmd,
563 Params: []string{replyTo, cmd, "Unknown CAP command"},
564 }}
565 }
566 return nil
567}
568
569func sanityCheckServer(addr string) error {
570 dialer := net.Dialer{Timeout: 30 * time.Second}
571 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
572 if err != nil {
573 return err
574 }
575 return conn.Close()
576}
577
578func unmarshalUsername(rawUsername string) (username, network string) {
579 username = rawUsername
580 if i := strings.LastIndexAny(username, "/@"); i >= 0 {
581 network = username[i+1:]
582 }
583 if i := strings.IndexAny(username, "/@"); i >= 0 {
584 username = username[:i]
585 }
586 return username, network
587}
588
589func (dc *downstreamConn) setNetwork(networkName string) error {
590 if networkName == "" {
591 return nil
592 }
593
594 network := dc.user.getNetwork(networkName)
595 if network == nil {
596 addr := networkName
597 if !strings.ContainsRune(addr, ':') {
598 addr = addr + ":6697"
599 }
600
601 dc.logger.Printf("trying to connect to new network %q", addr)
602 if err := sanityCheckServer(addr); err != nil {
603 dc.logger.Printf("failed to connect to %q: %v", addr, err)
604 return ircError{&irc.Message{
605 Command: irc.ERR_PASSWDMISMATCH,
606 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", networkName)},
607 }}
608 }
609
610 dc.logger.Printf("auto-saving network %q", networkName)
611 var err error
612 network, err = dc.user.createNetwork(&Network{
613 Addr: networkName,
614 Nick: dc.nick,
615 })
616 if err != nil {
617 return err
618 }
619 }
620
621 dc.network = network
622 return nil
623}
624
625func (dc *downstreamConn) authenticate(username, password string) error {
626 username, networkName := unmarshalUsername(username)
627
628 u := dc.srv.getUser(username)
629 if u == nil {
630 dc.logger.Printf("failed authentication for %q: unknown username", username)
631 return errAuthFailed
632 }
633
634 err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
635 if err != nil {
636 dc.logger.Printf("failed authentication for %q: %v", username, err)
637 return errAuthFailed
638 }
639
640 dc.user = u
641
642 return dc.setNetwork(networkName)
643}
644
645func (dc *downstreamConn) register() error {
646 password := dc.password
647 dc.password = ""
648 if dc.user == nil {
649 if err := dc.authenticate(dc.rawUsername, password); err != nil {
650 return err
651 }
652 } else if dc.network == nil {
653 _, networkName := unmarshalUsername(dc.rawUsername)
654 if err := dc.setNetwork(networkName); err != nil {
655 return err
656 }
657 }
658
659 dc.registered = true
660 dc.username = dc.user.Username
661 dc.logger.Printf("registration complete for user %q", dc.username)
662
663 firstDownstream := dc.user.addDownstream(dc)
664
665 dc.SendMessage(&irc.Message{
666 Prefix: dc.srv.prefix(),
667 Command: irc.RPL_WELCOME,
668 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
669 })
670 dc.SendMessage(&irc.Message{
671 Prefix: dc.srv.prefix(),
672 Command: irc.RPL_YOURHOST,
673 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
674 })
675 dc.SendMessage(&irc.Message{
676 Prefix: dc.srv.prefix(),
677 Command: irc.RPL_CREATED,
678 Params: []string{dc.nick, "Who cares when the server was created?"},
679 })
680 dc.SendMessage(&irc.Message{
681 Prefix: dc.srv.prefix(),
682 Command: irc.RPL_MYINFO,
683 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
684 })
685 // TODO: RPL_ISUPPORT
686 dc.SendMessage(&irc.Message{
687 Prefix: dc.srv.prefix(),
688 Command: irc.ERR_NOMOTD,
689 Params: []string{dc.nick, "No MOTD"},
690 })
691
692 dc.forEachUpstream(func(uc *upstreamConn) {
693 for _, ch := range uc.channels {
694 if ch.complete {
695 dc.SendMessage(&irc.Message{
696 Prefix: dc.prefix(),
697 Command: "JOIN",
698 Params: []string{dc.marshalChannel(ch.conn, ch.Name)},
699 })
700
701 forwardChannel(dc, ch)
702 }
703 }
704 })
705
706 dc.forEachNetwork(func(net *network) {
707 // TODO: need to take dc.network into account when deciding whether or
708 // not to load history
709 dc.runNetwork(net, firstDownstream)
710 })
711
712 return nil
713}
714
715// runNetwork starts listening for messages coming from the network's ring
716// buffer.
717//
718// It panics if the network is not suitable for the downstream connection.
719func (dc *downstreamConn) runNetwork(net *network, loadHistory bool) {
720 if dc.network != nil && net != dc.network {
721 panic("network not suitable for downstream connection")
722 }
723
724 historyName := dc.rawUsername
725
726 var seqPtr *uint64
727 if loadHistory {
728 net.lock.Lock()
729 seq, ok := net.history[historyName]
730 net.lock.Unlock()
731 if ok {
732 seqPtr = &seq
733 }
734 }
735
736 consumer, ch := net.ring.NewConsumer(seqPtr)
737 go func() {
738 for {
739 var closed bool
740 select {
741 case <-ch:
742 uc := net.upstream()
743 if uc == nil {
744 dc.logger.Printf("ignoring messages for upstream %q: upstream is disconnected", net.Addr)
745 break
746 }
747 dc.ringMessages <- ringMessage{consumer, uc}
748 case <-dc.closed:
749 closed = true
750 }
751 if closed {
752 break
753 }
754 }
755
756 seq := consumer.Close()
757
758 // TODO: need to take dc.network into account here
759 dc.user.lock.Lock()
760 lastDownstream := len(dc.user.downstreamConns) == 0
761 dc.user.lock.Unlock()
762
763 if lastDownstream {
764 net.lock.Lock()
765 net.history[historyName] = seq
766 net.lock.Unlock()
767 }
768 }()
769}
770
771func (dc *downstreamConn) runUntilRegistered() error {
772 for !dc.registered {
773 msg, err := dc.irc.ReadMessage()
774 if err != nil {
775 return fmt.Errorf("failed to read IRC command: %v", err)
776 }
777
778 if dc.srv.Debug {
779 dc.logger.Printf("received: %v", msg)
780 }
781
782 err = dc.handleMessage(msg)
783 if ircErr, ok := err.(ircError); ok {
784 ircErr.Message.Prefix = dc.srv.prefix()
785 dc.SendMessage(ircErr.Message)
786 } else if err != nil {
787 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
788 }
789 }
790
791 return nil
792}
793
794func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
795 switch msg.Command {
796 case "CAP":
797 var subCmd string
798 if err := parseMessageParams(msg, &subCmd); err != nil {
799 return err
800 }
801 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
802 return err
803 }
804 case "PING":
805 dc.SendMessage(&irc.Message{
806 Prefix: dc.srv.prefix(),
807 Command: "PONG",
808 Params: msg.Params,
809 })
810 return nil
811 case "USER":
812 return ircError{&irc.Message{
813 Command: irc.ERR_ALREADYREGISTERED,
814 Params: []string{dc.nick, "You may not reregister"},
815 }}
816 case "NICK":
817 var nick string
818 if err := parseMessageParams(msg, &nick); err != nil {
819 return err
820 }
821
822 var err error
823 dc.forEachNetwork(func(n *network) {
824 if err != nil {
825 return
826 }
827 n.Nick = nick
828 err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
829 })
830 if err != nil {
831 return err
832 }
833
834 dc.forEachUpstream(func(uc *upstreamConn) {
835 uc.SendMessage(msg)
836 })
837 case "JOIN":
838 var namesStr string
839 if err := parseMessageParams(msg, &namesStr); err != nil {
840 return err
841 }
842
843 var keys []string
844 if len(msg.Params) > 1 {
845 keys = strings.Split(msg.Params[1], ",")
846 }
847
848 for i, name := range strings.Split(namesStr, ",") {
849 uc, upstreamName, err := dc.unmarshalEntity(name)
850 if err != nil {
851 return err
852 }
853
854 var key string
855 if len(keys) > i {
856 key = keys[i]
857 }
858
859 params := []string{upstreamName}
860 if key != "" {
861 params = append(params, key)
862 }
863 uc.SendMessage(&irc.Message{
864 Command: "JOIN",
865 Params: params,
866 })
867
868 err = dc.srv.db.StoreChannel(uc.network.ID, &Channel{
869 Name: upstreamName,
870 Key: key,
871 })
872 if err != nil {
873 dc.logger.Printf("failed to create channel %q in DB: %v", upstreamName, err)
874 }
875 }
876 case "PART":
877 var namesStr string
878 if err := parseMessageParams(msg, &namesStr); err != nil {
879 return err
880 }
881
882 var reason string
883 if len(msg.Params) > 1 {
884 reason = msg.Params[1]
885 }
886
887 for _, name := range strings.Split(namesStr, ",") {
888 uc, upstreamName, err := dc.unmarshalEntity(name)
889 if err != nil {
890 return err
891 }
892
893 params := []string{upstreamName}
894 if reason != "" {
895 params = append(params, reason)
896 }
897 uc.SendMessage(&irc.Message{
898 Command: "PART",
899 Params: params,
900 })
901
902 if err := dc.srv.db.DeleteChannel(uc.network.ID, upstreamName); err != nil {
903 dc.logger.Printf("failed to delete channel %q in DB: %v", upstreamName, err)
904 }
905 }
906 case "KICK":
907 var channelStr, userStr string
908 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
909 return err
910 }
911
912 channels := strings.Split(channelStr, ",")
913 users := strings.Split(userStr, ",")
914
915 var reason string
916 if len(msg.Params) > 2 {
917 reason = msg.Params[2]
918 }
919
920 if len(channels) != 1 && len(channels) != len(users) {
921 return ircError{&irc.Message{
922 Command: irc.ERR_BADCHANMASK,
923 Params: []string{dc.nick, channelStr, "Bad channel mask"},
924 }}
925 }
926
927 for i, user := range users {
928 var channel string
929 if len(channels) == 1 {
930 channel = channels[0]
931 } else {
932 channel = channels[i]
933 }
934
935 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
936 if err != nil {
937 return err
938 }
939
940 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
941 if err != nil {
942 return err
943 }
944
945 if ucChannel != ucUser {
946 return ircError{&irc.Message{
947 Command: irc.ERR_USERNOTINCHANNEL,
948 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
949 }}
950 }
951 uc := ucChannel
952
953 params := []string{upstreamChannel, upstreamUser}
954 if reason != "" {
955 params = append(params, reason)
956 }
957 uc.SendMessage(&irc.Message{
958 Command: "KICK",
959 Params: params,
960 })
961 }
962 case "MODE":
963 var name string
964 if err := parseMessageParams(msg, &name); err != nil {
965 return err
966 }
967
968 var modeStr string
969 if len(msg.Params) > 1 {
970 modeStr = msg.Params[1]
971 }
972
973 if name == dc.nick {
974 if modeStr != "" {
975 dc.forEachUpstream(func(uc *upstreamConn) {
976 uc.SendMessage(&irc.Message{
977 Command: "MODE",
978 Params: []string{uc.nick, modeStr},
979 })
980 })
981 } else {
982 dc.SendMessage(&irc.Message{
983 Prefix: dc.srv.prefix(),
984 Command: irc.RPL_UMODEIS,
985 Params: []string{dc.nick, ""}, // TODO
986 })
987 }
988 return nil
989 }
990
991 uc, upstreamName, err := dc.unmarshalEntity(name)
992 if err != nil {
993 return err
994 }
995
996 if !uc.isChannel(upstreamName) {
997 return ircError{&irc.Message{
998 Command: irc.ERR_USERSDONTMATCH,
999 Params: []string{dc.nick, "Cannot change mode for other users"},
1000 }}
1001 }
1002
1003 if modeStr != "" {
1004 params := []string{upstreamName, modeStr}
1005 params = append(params, msg.Params[2:]...)
1006 uc.SendMessage(&irc.Message{
1007 Command: "MODE",
1008 Params: params,
1009 })
1010 } else {
1011 ch, ok := uc.channels[upstreamName]
1012 if !ok {
1013 return ircError{&irc.Message{
1014 Command: irc.ERR_NOSUCHCHANNEL,
1015 Params: []string{dc.nick, name, "No such channel"},
1016 }}
1017 }
1018
1019 if ch.modes == nil {
1020 // we haven't received the initial RPL_CHANNELMODEIS yet
1021 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1022 return nil
1023 }
1024
1025 modeStr, modeParams := ch.modes.Format()
1026 params := []string{dc.nick, name, modeStr}
1027 params = append(params, modeParams...)
1028
1029 dc.SendMessage(&irc.Message{
1030 Prefix: dc.srv.prefix(),
1031 Command: irc.RPL_CHANNELMODEIS,
1032 Params: params,
1033 })
1034 }
1035 case "TOPIC":
1036 var channel string
1037 if err := parseMessageParams(msg, &channel); err != nil {
1038 return err
1039 }
1040
1041 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1042 if err != nil {
1043 return err
1044 }
1045
1046 if len(msg.Params) > 1 { // setting topic
1047 topic := msg.Params[1]
1048 uc.SendMessage(&irc.Message{
1049 Command: "TOPIC",
1050 Params: []string{upstreamChannel, topic},
1051 })
1052 } else { // getting topic
1053 ch, ok := uc.channels[upstreamChannel]
1054 if !ok {
1055 return ircError{&irc.Message{
1056 Command: irc.ERR_NOSUCHCHANNEL,
1057 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1058 }}
1059 }
1060 sendTopic(dc, ch)
1061 }
1062 case "NAMES":
1063 if len(msg.Params) == 0 {
1064 dc.SendMessage(&irc.Message{
1065 Prefix: dc.srv.prefix(),
1066 Command: irc.RPL_ENDOFNAMES,
1067 Params: []string{dc.nick, "*", "End of /NAMES list"},
1068 })
1069 return nil
1070 }
1071
1072 channels := strings.Split(msg.Params[0], ",")
1073 for _, channel := range channels {
1074 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1075 if err != nil {
1076 return err
1077 }
1078
1079 ch, ok := uc.channels[upstreamChannel]
1080 if ok {
1081 sendNames(dc, ch)
1082 } else {
1083 // NAMES on a channel we have not joined, ask upstream
1084 uc.SendMessageLabeled(dc, &irc.Message{
1085 Command: "NAMES",
1086 Params: []string{upstreamChannel},
1087 })
1088 }
1089 }
1090 case "WHO":
1091 if len(msg.Params) == 0 {
1092 // TODO: support WHO without parameters
1093 dc.SendMessage(&irc.Message{
1094 Prefix: dc.srv.prefix(),
1095 Command: irc.RPL_ENDOFWHO,
1096 Params: []string{dc.nick, "*", "End of /WHO list"},
1097 })
1098 return nil
1099 }
1100
1101 // TODO: support WHO masks
1102 entity := msg.Params[0]
1103
1104 if entity == dc.nick {
1105 // TODO: support AWAY (H/G) in self WHO reply
1106 dc.SendMessage(&irc.Message{
1107 Prefix: dc.srv.prefix(),
1108 Command: irc.RPL_WHOREPLY,
1109 Params: []string{dc.nick, "*", dc.username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1110 })
1111 dc.SendMessage(&irc.Message{
1112 Prefix: dc.srv.prefix(),
1113 Command: irc.RPL_ENDOFWHO,
1114 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1115 })
1116 return nil
1117 }
1118
1119 uc, upstreamName, err := dc.unmarshalEntity(entity)
1120 if err != nil {
1121 return err
1122 }
1123
1124 var params []string
1125 if len(msg.Params) == 2 {
1126 params = []string{upstreamName, msg.Params[1]}
1127 } else {
1128 params = []string{upstreamName}
1129 }
1130
1131 uc.SendMessageLabeled(dc, &irc.Message{
1132 Command: "WHO",
1133 Params: params,
1134 })
1135 case "WHOIS":
1136 if len(msg.Params) == 0 {
1137 return ircError{&irc.Message{
1138 Command: irc.ERR_NONICKNAMEGIVEN,
1139 Params: []string{dc.nick, "No nickname given"},
1140 }}
1141 }
1142
1143 var target, mask string
1144 if len(msg.Params) == 1 {
1145 target = ""
1146 mask = msg.Params[0]
1147 } else {
1148 target = msg.Params[0]
1149 mask = msg.Params[1]
1150 }
1151 // TODO: support multiple WHOIS users
1152 if i := strings.IndexByte(mask, ','); i >= 0 {
1153 mask = mask[:i]
1154 }
1155
1156 if mask == dc.nick {
1157 dc.SendMessage(&irc.Message{
1158 Prefix: dc.srv.prefix(),
1159 Command: irc.RPL_WHOISUSER,
1160 Params: []string{dc.nick, dc.nick, dc.username, dc.hostname, "*", dc.realname},
1161 })
1162 dc.SendMessage(&irc.Message{
1163 Prefix: dc.srv.prefix(),
1164 Command: irc.RPL_WHOISSERVER,
1165 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1166 })
1167 dc.SendMessage(&irc.Message{
1168 Prefix: dc.srv.prefix(),
1169 Command: irc.RPL_ENDOFWHOIS,
1170 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1171 })
1172 return nil
1173 }
1174
1175 // TODO: support WHOIS masks
1176 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1177 if err != nil {
1178 return err
1179 }
1180
1181 var params []string
1182 if target != "" {
1183 params = []string{target, upstreamNick}
1184 } else {
1185 params = []string{upstreamNick}
1186 }
1187
1188 uc.SendMessageLabeled(dc, &irc.Message{
1189 Command: "WHOIS",
1190 Params: params,
1191 })
1192 case "PRIVMSG":
1193 var targetsStr, text string
1194 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1195 return err
1196 }
1197
1198 for _, name := range strings.Split(targetsStr, ",") {
1199 if name == serviceNick {
1200 handleServicePRIVMSG(dc, text)
1201 continue
1202 }
1203
1204 uc, upstreamName, err := dc.unmarshalEntity(name)
1205 if err != nil {
1206 return err
1207 }
1208
1209 if upstreamName == "NickServ" {
1210 dc.handleNickServPRIVMSG(uc, text)
1211 }
1212
1213 uc.SendMessage(&irc.Message{
1214 Command: "PRIVMSG",
1215 Params: []string{upstreamName, text},
1216 })
1217
1218 echoMsg := &irc.Message{
1219 Prefix: &irc.Prefix{
1220 Name: uc.nick,
1221 User: uc.username,
1222 },
1223 Command: "PRIVMSG",
1224 Params: []string{upstreamName, text},
1225 }
1226 dc.lock.Lock()
1227 dc.ourMessages[echoMsg] = struct{}{}
1228 dc.lock.Unlock()
1229
1230 uc.network.ring.Produce(echoMsg)
1231 }
1232 default:
1233 dc.logger.Printf("unhandled message: %v", msg)
1234 return newUnknownCommandError(msg.Command)
1235 }
1236 return nil
1237}
1238
1239func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1240 username, password, ok := parseNickServCredentials(text, uc.nick)
1241 if !ok {
1242 return
1243 }
1244
1245 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1246 n := uc.network
1247 n.SASL.Mechanism = "PLAIN"
1248 n.SASL.Plain.Username = username
1249 n.SASL.Plain.Password = password
1250 if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
1251 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1252 }
1253}
1254
1255func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1256 fields := strings.Fields(text)
1257 if len(fields) < 2 {
1258 return "", "", false
1259 }
1260 cmd := strings.ToUpper(fields[0])
1261 params := fields[1:]
1262 switch cmd {
1263 case "REGISTER":
1264 username = nick
1265 password = params[0]
1266 case "IDENTIFY":
1267 if len(params) == 1 {
1268 username = nick
1269 } else {
1270 username = params[0]
1271 }
1272 password = params[1]
1273 }
1274 return username, password, true
1275}
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