source: code/trunk/downstream.go@ 281

Last change on this file since 281 was 279, checked in by contact, 5 years ago

Remove network.upstream

This is an artifact from when we used locks. No need for this anymore.
File size: 33.9 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
53// permanentDownstreamCaps is the list of always-supported downstream
54// capabilities.
55var permanentDownstreamCaps = map[string]string{
56 "batch": "",
57 "cap-notify": "",
58 "echo-message": "",
59 "message-tags": "",
60 "sasl": "PLAIN",
61 "server-time": "",
62}
63
64type downstreamConn struct {
65 conn
66
67 id uint64
68
69 registered bool
70 user *user
71 nick string
72 rawUsername string
73 networkName string
74 clientName string
75 realname string
76 hostname string
77 password string // empty after authentication
78 network *network // can be nil
79
80 negociatingCaps bool
81 capVersion int
82 supportedCaps map[string]string
83 caps map[string]bool
84
85 saslServer sasl.Server
86}
87
88func newDownstreamConn(srv *Server, netConn net.Conn, id uint64) *downstreamConn {
89 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())}
90 dc := &downstreamConn{
91 conn: *newConn(srv, netConn, logger),
92 id: id,
93 supportedCaps: make(map[string]string),
94 caps: make(map[string]bool),
95 }
96 dc.hostname = netConn.RemoteAddr().String()
97 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
98 dc.hostname = host
99 }
100 for k, v := range permanentDownstreamCaps {
101 dc.supportedCaps[k] = v
102 }
103 return dc
104}
105
106func (dc *downstreamConn) prefix() *irc.Prefix {
107 return &irc.Prefix{
108 Name: dc.nick,
109 User: dc.user.Username,
110 Host: dc.hostname,
111 }
112}
113
114func (dc *downstreamConn) forEachNetwork(f func(*network)) {
115 if dc.network != nil {
116 f(dc.network)
117 } else {
118 dc.user.forEachNetwork(f)
119 }
120}
121
122func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
123 dc.user.forEachUpstream(func(uc *upstreamConn) {
124 if dc.network != nil && uc.network != dc.network {
125 return
126 }
127 f(uc)
128 })
129}
130
131// upstream returns the upstream connection, if any. If there are zero or if
132// there are multiple upstream connections, it returns nil.
133func (dc *downstreamConn) upstream() *upstreamConn {
134 if dc.network == nil {
135 return nil
136 }
137 return dc.network.conn
138}
139
140func isOurNick(net *network, nick string) bool {
141 // TODO: this doesn't account for nick changes
142 if net.conn != nil {
143 return nick == net.conn.nick
144 }
145 // We're not currently connected to the upstream connection, so we don't
146 // know whether this name is our nickname. Best-effort: use the network's
147 // configured nickname and hope it was the one being used when we were
148 // connected.
149 return nick == net.Nick
150}
151
152// marshalEntity converts an upstream entity name (ie. channel or nick) into a
153// downstream entity name.
154//
155// This involves adding a "/<network>" suffix if the entity isn't the current
156// user.
157func (dc *downstreamConn) marshalEntity(net *network, name string) string {
158 if dc.network != nil {
159 if dc.network != net {
160 panic("soju: tried to marshal an entity for another network")
161 }
162 return name
163 }
164 if isOurNick(net, name) {
165 return dc.nick
166 }
167 return name + "/" + net.GetName()
168}
169
170func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
171 if isOurNick(net, prefix.Name) {
172 return dc.prefix()
173 }
174 if dc.network != nil {
175 if dc.network != net {
176 panic("soju: tried to marshal a user prefix for another network")
177 }
178 return prefix
179 }
180 return &irc.Prefix{
181 Name: prefix.Name + "/" + net.GetName(),
182 User: prefix.User,
183 Host: prefix.Host,
184 }
185}
186
187// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
188// an upstream entity name.
189//
190// This involves removing the "/<network>" suffix.
191func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
192 if uc := dc.upstream(); uc != nil {
193 return uc, name, nil
194 }
195
196 var conn *upstreamConn
197 if i := strings.LastIndexByte(name, '/'); i >= 0 {
198 network := name[i+1:]
199 name = name[:i]
200
201 dc.forEachUpstream(func(uc *upstreamConn) {
202 if network != uc.network.GetName() {
203 return
204 }
205 conn = uc
206 })
207 }
208
209 if conn == nil {
210 return nil, "", ircError{&irc.Message{
211 Command: irc.ERR_NOSUCHCHANNEL,
212 Params: []string{name, "No such channel"},
213 }}
214 }
215 return conn, name, nil
216}
217
218func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
219 if dc.upstream() != nil {
220 return text
221 }
222 // TODO: smarter parsing that ignores URLs
223 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
224}
225
226func (dc *downstreamConn) readMessages(ch chan<- event) error {
227 for {
228 msg, err := dc.ReadMessage()
229 if err == io.EOF {
230 break
231 } else if err != nil {
232 return fmt.Errorf("failed to read IRC command: %v", err)
233 }
234
235 ch <- eventDownstreamMessage{msg, dc}
236 }
237
238 return nil
239}
240
241// SendMessage sends an outgoing message.
242//
243// This can only called from the user goroutine.
244func (dc *downstreamConn) SendMessage(msg *irc.Message) {
245 if !dc.caps["message-tags"] {
246 msg = msg.Copy()
247 for name := range msg.Tags {
248 supported := false
249 switch name {
250 case "time":
251 supported = dc.caps["server-time"]
252 }
253 if !supported {
254 delete(msg.Tags, name)
255 }
256 }
257 }
258
259 dc.conn.SendMessage(msg)
260}
261
262// marshalMessage re-formats a message coming from an upstream connection so
263// that it's suitable for being sent on this downstream connection. Only
264// messages that may appear in logs are supported.
265func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
266 msg = msg.Copy()
267 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
268
269 switch msg.Command {
270 case "PRIVMSG", "NOTICE":
271 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
272 case "NICK":
273 // Nick change for another user
274 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
275 case "JOIN", "PART":
276 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
277 case "KICK":
278 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
279 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
280 case "TOPIC":
281 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
282 case "MODE":
283 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
284 case "QUIT":
285 // This space is intentionally left blank
286 default:
287 panic(fmt.Sprintf("unexpected %q message", msg.Command))
288 }
289
290 return msg
291}
292
293func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
294 switch msg.Command {
295 case "QUIT":
296 return dc.Close()
297 default:
298 if dc.registered {
299 return dc.handleMessageRegistered(msg)
300 } else {
301 return dc.handleMessageUnregistered(msg)
302 }
303 }
304}
305
306func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
307 switch msg.Command {
308 case "NICK":
309 var nick string
310 if err := parseMessageParams(msg, &nick); err != nil {
311 return err
312 }
313 if nick == serviceNick {
314 return ircError{&irc.Message{
315 Command: irc.ERR_NICKNAMEINUSE,
316 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
317 }}
318 }
319 dc.nick = nick
320 case "USER":
321 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
322 return err
323 }
324 case "PASS":
325 if err := parseMessageParams(msg, &dc.password); err != nil {
326 return err
327 }
328 case "CAP":
329 var subCmd string
330 if err := parseMessageParams(msg, &subCmd); err != nil {
331 return err
332 }
333 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
334 return err
335 }
336 case "AUTHENTICATE":
337 if !dc.caps["sasl"] {
338 return ircError{&irc.Message{
339 Command: irc.ERR_SASLFAIL,
340 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
341 }}
342 }
343 if len(msg.Params) == 0 {
344 return ircError{&irc.Message{
345 Command: irc.ERR_SASLFAIL,
346 Params: []string{"*", "Missing AUTHENTICATE argument"},
347 }}
348 }
349 if dc.nick == "" {
350 return ircError{&irc.Message{
351 Command: irc.ERR_SASLFAIL,
352 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
353 }}
354 }
355
356 var resp []byte
357 if dc.saslServer == nil {
358 mech := strings.ToUpper(msg.Params[0])
359 switch mech {
360 case "PLAIN":
361 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
362 return dc.authenticate(username, password)
363 }))
364 default:
365 return ircError{&irc.Message{
366 Command: irc.ERR_SASLFAIL,
367 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
368 }}
369 }
370 } else if msg.Params[0] == "*" {
371 dc.saslServer = nil
372 return ircError{&irc.Message{
373 Command: irc.ERR_SASLABORTED,
374 Params: []string{"*", "SASL authentication aborted"},
375 }}
376 } else if msg.Params[0] == "+" {
377 resp = nil
378 } else {
379 // TODO: multi-line messages
380 var err error
381 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
382 if err != nil {
383 dc.saslServer = nil
384 return ircError{&irc.Message{
385 Command: irc.ERR_SASLFAIL,
386 Params: []string{"*", "Invalid base64-encoded response"},
387 }}
388 }
389 }
390
391 challenge, done, err := dc.saslServer.Next(resp)
392 if err != nil {
393 dc.saslServer = nil
394 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
395 return ircError{&irc.Message{
396 Command: irc.ERR_SASLFAIL,
397 Params: []string{"*", ircErr.Message.Params[1]},
398 }}
399 }
400 dc.SendMessage(&irc.Message{
401 Prefix: dc.srv.prefix(),
402 Command: irc.ERR_SASLFAIL,
403 Params: []string{"*", "SASL error"},
404 })
405 return fmt.Errorf("SASL authentication failed: %v", err)
406 } else if done {
407 dc.saslServer = nil
408 dc.SendMessage(&irc.Message{
409 Prefix: dc.srv.prefix(),
410 Command: irc.RPL_LOGGEDIN,
411 Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
412 })
413 dc.SendMessage(&irc.Message{
414 Prefix: dc.srv.prefix(),
415 Command: irc.RPL_SASLSUCCESS,
416 Params: []string{dc.nick, "SASL authentication successful"},
417 })
418 } else {
419 challengeStr := "+"
420 if len(challenge) > 0 {
421 challengeStr = base64.StdEncoding.EncodeToString(challenge)
422 }
423
424 // TODO: multi-line messages
425 dc.SendMessage(&irc.Message{
426 Prefix: dc.srv.prefix(),
427 Command: "AUTHENTICATE",
428 Params: []string{challengeStr},
429 })
430 }
431 default:
432 dc.logger.Printf("unhandled message: %v", msg)
433 return newUnknownCommandError(msg.Command)
434 }
435 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
436 return dc.register()
437 }
438 return nil
439}
440
441func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
442 cmd = strings.ToUpper(cmd)
443
444 replyTo := dc.nick
445 if !dc.registered {
446 replyTo = "*"
447 }
448
449 switch cmd {
450 case "LS":
451 if len(args) > 0 {
452 var err error
453 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
454 return err
455 }
456 }
457
458 caps := make([]string, 0, len(dc.supportedCaps))
459 for k, v := range dc.supportedCaps {
460 if dc.capVersion >= 302 && v != "" {
461 caps = append(caps, k+"="+v)
462 } else {
463 caps = append(caps, k)
464 }
465 }
466
467 // TODO: multi-line replies
468 dc.SendMessage(&irc.Message{
469 Prefix: dc.srv.prefix(),
470 Command: "CAP",
471 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
472 })
473
474 if dc.capVersion >= 302 {
475 // CAP version 302 implicitly enables cap-notify
476 dc.caps["cap-notify"] = true
477 }
478
479 if !dc.registered {
480 dc.negociatingCaps = true
481 }
482 case "LIST":
483 var caps []string
484 for name := range dc.caps {
485 caps = append(caps, name)
486 }
487
488 // TODO: multi-line replies
489 dc.SendMessage(&irc.Message{
490 Prefix: dc.srv.prefix(),
491 Command: "CAP",
492 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
493 })
494 case "REQ":
495 if len(args) == 0 {
496 return ircError{&irc.Message{
497 Command: err_invalidcapcmd,
498 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
499 }}
500 }
501
502 // TODO: atomically ack/nak the whole capability set
503 caps := strings.Fields(args[0])
504 ack := true
505 for _, name := range caps {
506 name = strings.ToLower(name)
507 enable := !strings.HasPrefix(name, "-")
508 if !enable {
509 name = strings.TrimPrefix(name, "-")
510 }
511
512 if enable == dc.caps[name] {
513 continue
514 }
515
516 _, ok := dc.supportedCaps[name]
517 if !ok {
518 ack = false
519 break
520 }
521
522 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
523 // cap-notify cannot be disabled with CAP version 302
524 ack = false
525 break
526 }
527
528 dc.caps[name] = enable
529 }
530
531 reply := "NAK"
532 if ack {
533 reply = "ACK"
534 }
535 dc.SendMessage(&irc.Message{
536 Prefix: dc.srv.prefix(),
537 Command: "CAP",
538 Params: []string{replyTo, reply, args[0]},
539 })
540 case "END":
541 dc.negociatingCaps = false
542 default:
543 return ircError{&irc.Message{
544 Command: err_invalidcapcmd,
545 Params: []string{replyTo, cmd, "Unknown CAP command"},
546 }}
547 }
548 return nil
549}
550
551func (dc *downstreamConn) setSupportedCap(name, value string) {
552 prevValue, hasPrev := dc.supportedCaps[name]
553 changed := !hasPrev || prevValue != value
554 dc.supportedCaps[name] = value
555
556 if !dc.caps["cap-notify"] || !changed {
557 return
558 }
559
560 replyTo := dc.nick
561 if !dc.registered {
562 replyTo = "*"
563 }
564
565 cap := name
566 if value != "" && dc.capVersion >= 302 {
567 cap = name + "=" + value
568 }
569
570 dc.SendMessage(&irc.Message{
571 Prefix: dc.srv.prefix(),
572 Command: "CAP",
573 Params: []string{replyTo, "NEW", cap},
574 })
575}
576
577func (dc *downstreamConn) unsetSupportedCap(name string) {
578 _, hasPrev := dc.supportedCaps[name]
579 delete(dc.supportedCaps, name)
580 delete(dc.caps, name)
581
582 if !dc.caps["cap-notify"] || !hasPrev {
583 return
584 }
585
586 replyTo := dc.nick
587 if !dc.registered {
588 replyTo = "*"
589 }
590
591 dc.SendMessage(&irc.Message{
592 Prefix: dc.srv.prefix(),
593 Command: "CAP",
594 Params: []string{replyTo, "DEL", name},
595 })
596}
597
598func (dc *downstreamConn) updateSupportedCaps() {
599 awayNotifySupported := true
600 dc.forEachUpstream(func(uc *upstreamConn) {
601 awayNotifySupported = awayNotifySupported && uc.caps["away-notify"]
602 })
603
604 if awayNotifySupported {
605 dc.setSupportedCap("away-notify", "")
606 } else {
607 dc.unsetSupportedCap("away-notify")
608 }
609}
610
611func sanityCheckServer(addr string) error {
612 dialer := net.Dialer{Timeout: 30 * time.Second}
613 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
614 if err != nil {
615 return err
616 }
617 return conn.Close()
618}
619
620func unmarshalUsername(rawUsername string) (username, client, network string) {
621 username = rawUsername
622
623 i := strings.IndexAny(username, "/@")
624 j := strings.LastIndexAny(username, "/@")
625 if i >= 0 {
626 username = rawUsername[:i]
627 }
628 if j >= 0 {
629 if rawUsername[j] == '@' {
630 client = rawUsername[j+1:]
631 } else {
632 network = rawUsername[j+1:]
633 }
634 }
635 if i >= 0 && j >= 0 && i < j {
636 if rawUsername[i] == '@' {
637 client = rawUsername[i+1 : j]
638 } else {
639 network = rawUsername[i+1 : j]
640 }
641 }
642
643 return username, client, network
644}
645
646func (dc *downstreamConn) authenticate(username, password string) error {
647 username, clientName, networkName := unmarshalUsername(username)
648
649 u, err := dc.srv.db.GetUser(username)
650 if err != nil {
651 dc.logger.Printf("failed authentication for %q: %v", username, err)
652 return errAuthFailed
653 }
654
655 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
656 if err != nil {
657 dc.logger.Printf("failed authentication for %q: %v", username, err)
658 return errAuthFailed
659 }
660
661 dc.user = dc.srv.getUser(username)
662 if dc.user == nil {
663 dc.logger.Printf("failed authentication for %q: user not active", username)
664 return errAuthFailed
665 }
666 dc.clientName = clientName
667 dc.networkName = networkName
668 return nil
669}
670
671func (dc *downstreamConn) register() error {
672 if dc.registered {
673 return fmt.Errorf("tried to register twice")
674 }
675
676 password := dc.password
677 dc.password = ""
678 if dc.user == nil {
679 if err := dc.authenticate(dc.rawUsername, password); err != nil {
680 return err
681 }
682 }
683
684 if dc.clientName == "" && dc.networkName == "" {
685 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
686 }
687
688 dc.registered = true
689 dc.logger.Printf("registration complete for user %q", dc.user.Username)
690 return nil
691}
692
693func (dc *downstreamConn) loadNetwork() error {
694 if dc.networkName == "" {
695 return nil
696 }
697
698 network := dc.user.getNetwork(dc.networkName)
699 if network == nil {
700 addr := dc.networkName
701 if !strings.ContainsRune(addr, ':') {
702 addr = addr + ":6697"
703 }
704
705 dc.logger.Printf("trying to connect to new network %q", addr)
706 if err := sanityCheckServer(addr); err != nil {
707 dc.logger.Printf("failed to connect to %q: %v", addr, err)
708 return ircError{&irc.Message{
709 Command: irc.ERR_PASSWDMISMATCH,
710 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
711 }}
712 }
713
714 dc.logger.Printf("auto-saving network %q", dc.networkName)
715 var err error
716 network, err = dc.user.createNetwork(&Network{
717 Addr: dc.networkName,
718 Nick: dc.nick,
719 })
720 if err != nil {
721 return err
722 }
723 }
724
725 dc.network = network
726 return nil
727}
728
729func (dc *downstreamConn) welcome() error {
730 if dc.user == nil || !dc.registered {
731 panic("tried to welcome an unregistered connection")
732 }
733
734 // TODO: doing this might take some time. We should do it in dc.register
735 // instead, but we'll potentially be adding a new network and this must be
736 // done in the user goroutine.
737 if err := dc.loadNetwork(); err != nil {
738 return err
739 }
740
741 dc.SendMessage(&irc.Message{
742 Prefix: dc.srv.prefix(),
743 Command: irc.RPL_WELCOME,
744 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
745 })
746 dc.SendMessage(&irc.Message{
747 Prefix: dc.srv.prefix(),
748 Command: irc.RPL_YOURHOST,
749 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
750 })
751 dc.SendMessage(&irc.Message{
752 Prefix: dc.srv.prefix(),
753 Command: irc.RPL_CREATED,
754 Params: []string{dc.nick, "Who cares when the server was created?"},
755 })
756 dc.SendMessage(&irc.Message{
757 Prefix: dc.srv.prefix(),
758 Command: irc.RPL_MYINFO,
759 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
760 })
761 // TODO: RPL_ISUPPORT
762 dc.SendMessage(&irc.Message{
763 Prefix: dc.srv.prefix(),
764 Command: irc.ERR_NOMOTD,
765 Params: []string{dc.nick, "No MOTD"},
766 })
767
768 dc.forEachUpstream(func(uc *upstreamConn) {
769 for _, ch := range uc.channels {
770 if ch.complete {
771 dc.SendMessage(&irc.Message{
772 Prefix: dc.prefix(),
773 Command: "JOIN",
774 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
775 })
776
777 forwardChannel(dc, ch)
778 }
779 }
780 })
781
782 dc.forEachNetwork(func(net *network) {
783 // Only send history if we're the first connected client with that name
784 // for the network
785 if _, ok := net.offlineClients[dc.clientName]; ok {
786 dc.sendNetworkHistory(net)
787 delete(net.offlineClients, dc.clientName)
788 }
789 })
790
791 return nil
792}
793
794func (dc *downstreamConn) sendNetworkHistory(net *network) {
795 for target, history := range net.history {
796 seq, ok := history.offlineClients[dc.clientName]
797 if !ok {
798 continue
799 }
800 delete(history.offlineClients, dc.clientName)
801
802 // If all clients have received history, no need to keep the
803 // ring buffer around
804 if len(history.offlineClients) == 0 {
805 delete(net.history, target)
806 }
807
808 consumer := history.ring.NewConsumer(seq)
809
810 batchRef := "history"
811 if dc.caps["batch"] {
812 dc.SendMessage(&irc.Message{
813 Prefix: dc.srv.prefix(),
814 Command: "BATCH",
815 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
816 })
817 }
818
819 for {
820 msg := consumer.Consume()
821 if msg == nil {
822 break
823 }
824
825 // Don't replay all messages, because that would mess up client
826 // state. For instance we just sent the list of users, sending
827 // PART messages for one of these users would be incorrect.
828 ignore := true
829 switch msg.Command {
830 case "PRIVMSG", "NOTICE":
831 ignore = false
832 }
833 if ignore {
834 continue
835 }
836
837 if dc.caps["batch"] {
838 msg = msg.Copy()
839 msg.Tags["batch"] = irc.TagValue(batchRef)
840 }
841
842 dc.SendMessage(dc.marshalMessage(msg, net))
843 }
844
845 if dc.caps["batch"] {
846 dc.SendMessage(&irc.Message{
847 Prefix: dc.srv.prefix(),
848 Command: "BATCH",
849 Params: []string{"-" + batchRef},
850 })
851 }
852 }
853}
854
855func (dc *downstreamConn) runUntilRegistered() error {
856 for !dc.registered {
857 msg, err := dc.ReadMessage()
858 if err != nil {
859 return fmt.Errorf("failed to read IRC command: %v", err)
860 }
861
862 err = dc.handleMessage(msg)
863 if ircErr, ok := err.(ircError); ok {
864 ircErr.Message.Prefix = dc.srv.prefix()
865 dc.SendMessage(ircErr.Message)
866 } else if err != nil {
867 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
868 }
869 }
870
871 return nil
872}
873
874func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
875 switch msg.Command {
876 case "CAP":
877 var subCmd string
878 if err := parseMessageParams(msg, &subCmd); err != nil {
879 return err
880 }
881 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
882 return err
883 }
884 case "PING":
885 dc.SendMessage(&irc.Message{
886 Prefix: dc.srv.prefix(),
887 Command: "PONG",
888 Params: msg.Params,
889 })
890 return nil
891 case "USER":
892 return ircError{&irc.Message{
893 Command: irc.ERR_ALREADYREGISTERED,
894 Params: []string{dc.nick, "You may not reregister"},
895 }}
896 case "NICK":
897 var nick string
898 if err := parseMessageParams(msg, &nick); err != nil {
899 return err
900 }
901
902 var err error
903 dc.forEachNetwork(func(n *network) {
904 if err != nil {
905 return
906 }
907 n.Nick = nick
908 err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
909 })
910 if err != nil {
911 return err
912 }
913
914 dc.forEachUpstream(func(uc *upstreamConn) {
915 uc.SendMessage(msg)
916 })
917 case "JOIN":
918 var namesStr string
919 if err := parseMessageParams(msg, &namesStr); err != nil {
920 return err
921 }
922
923 var keys []string
924 if len(msg.Params) > 1 {
925 keys = strings.Split(msg.Params[1], ",")
926 }
927
928 for i, name := range strings.Split(namesStr, ",") {
929 uc, upstreamName, err := dc.unmarshalEntity(name)
930 if err != nil {
931 return err
932 }
933
934 var key string
935 if len(keys) > i {
936 key = keys[i]
937 }
938
939 params := []string{upstreamName}
940 if key != "" {
941 params = append(params, key)
942 }
943 uc.SendMessage(&irc.Message{
944 Command: "JOIN",
945 Params: params,
946 })
947
948 ch := &Channel{Name: upstreamName, Key: key}
949 if err := uc.network.createUpdateChannel(ch); err != nil {
950 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
951 }
952 }
953 case "PART":
954 var namesStr string
955 if err := parseMessageParams(msg, &namesStr); err != nil {
956 return err
957 }
958
959 var reason string
960 if len(msg.Params) > 1 {
961 reason = msg.Params[1]
962 }
963
964 for _, name := range strings.Split(namesStr, ",") {
965 uc, upstreamName, err := dc.unmarshalEntity(name)
966 if err != nil {
967 return err
968 }
969
970 params := []string{upstreamName}
971 if reason != "" {
972 params = append(params, reason)
973 }
974 uc.SendMessage(&irc.Message{
975 Command: "PART",
976 Params: params,
977 })
978
979 if err := uc.network.deleteChannel(upstreamName); err != nil {
980 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
981 }
982 }
983 case "KICK":
984 var channelStr, userStr string
985 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
986 return err
987 }
988
989 channels := strings.Split(channelStr, ",")
990 users := strings.Split(userStr, ",")
991
992 var reason string
993 if len(msg.Params) > 2 {
994 reason = msg.Params[2]
995 }
996
997 if len(channels) != 1 && len(channels) != len(users) {
998 return ircError{&irc.Message{
999 Command: irc.ERR_BADCHANMASK,
1000 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1001 }}
1002 }
1003
1004 for i, user := range users {
1005 var channel string
1006 if len(channels) == 1 {
1007 channel = channels[0]
1008 } else {
1009 channel = channels[i]
1010 }
1011
1012 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1013 if err != nil {
1014 return err
1015 }
1016
1017 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1018 if err != nil {
1019 return err
1020 }
1021
1022 if ucChannel != ucUser {
1023 return ircError{&irc.Message{
1024 Command: irc.ERR_USERNOTINCHANNEL,
1025 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
1026 }}
1027 }
1028 uc := ucChannel
1029
1030 params := []string{upstreamChannel, upstreamUser}
1031 if reason != "" {
1032 params = append(params, reason)
1033 }
1034 uc.SendMessage(&irc.Message{
1035 Command: "KICK",
1036 Params: params,
1037 })
1038 }
1039 case "MODE":
1040 var name string
1041 if err := parseMessageParams(msg, &name); err != nil {
1042 return err
1043 }
1044
1045 var modeStr string
1046 if len(msg.Params) > 1 {
1047 modeStr = msg.Params[1]
1048 }
1049
1050 if name == dc.nick {
1051 if modeStr != "" {
1052 dc.forEachUpstream(func(uc *upstreamConn) {
1053 uc.SendMessage(&irc.Message{
1054 Command: "MODE",
1055 Params: []string{uc.nick, modeStr},
1056 })
1057 })
1058 } else {
1059 dc.SendMessage(&irc.Message{
1060 Prefix: dc.srv.prefix(),
1061 Command: irc.RPL_UMODEIS,
1062 Params: []string{dc.nick, ""}, // TODO
1063 })
1064 }
1065 return nil
1066 }
1067
1068 uc, upstreamName, err := dc.unmarshalEntity(name)
1069 if err != nil {
1070 return err
1071 }
1072
1073 if !uc.isChannel(upstreamName) {
1074 return ircError{&irc.Message{
1075 Command: irc.ERR_USERSDONTMATCH,
1076 Params: []string{dc.nick, "Cannot change mode for other users"},
1077 }}
1078 }
1079
1080 if modeStr != "" {
1081 params := []string{upstreamName, modeStr}
1082 params = append(params, msg.Params[2:]...)
1083 uc.SendMessage(&irc.Message{
1084 Command: "MODE",
1085 Params: params,
1086 })
1087 } else {
1088 ch, ok := uc.channels[upstreamName]
1089 if !ok {
1090 return ircError{&irc.Message{
1091 Command: irc.ERR_NOSUCHCHANNEL,
1092 Params: []string{dc.nick, name, "No such channel"},
1093 }}
1094 }
1095
1096 if ch.modes == nil {
1097 // we haven't received the initial RPL_CHANNELMODEIS yet
1098 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1099 return nil
1100 }
1101
1102 modeStr, modeParams := ch.modes.Format()
1103 params := []string{dc.nick, name, modeStr}
1104 params = append(params, modeParams...)
1105
1106 dc.SendMessage(&irc.Message{
1107 Prefix: dc.srv.prefix(),
1108 Command: irc.RPL_CHANNELMODEIS,
1109 Params: params,
1110 })
1111 if ch.creationTime != "" {
1112 dc.SendMessage(&irc.Message{
1113 Prefix: dc.srv.prefix(),
1114 Command: rpl_creationtime,
1115 Params: []string{dc.nick, name, ch.creationTime},
1116 })
1117 }
1118 }
1119 case "TOPIC":
1120 var channel string
1121 if err := parseMessageParams(msg, &channel); err != nil {
1122 return err
1123 }
1124
1125 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1126 if err != nil {
1127 return err
1128 }
1129
1130 if len(msg.Params) > 1 { // setting topic
1131 topic := msg.Params[1]
1132 uc.SendMessage(&irc.Message{
1133 Command: "TOPIC",
1134 Params: []string{upstreamChannel, topic},
1135 })
1136 } else { // getting topic
1137 ch, ok := uc.channels[upstreamChannel]
1138 if !ok {
1139 return ircError{&irc.Message{
1140 Command: irc.ERR_NOSUCHCHANNEL,
1141 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1142 }}
1143 }
1144 sendTopic(dc, ch)
1145 }
1146 case "LIST":
1147 // TODO: support ELIST when supported by all upstreams
1148
1149 pl := pendingLIST{
1150 downstreamID: dc.id,
1151 pendingCommands: make(map[int64]*irc.Message),
1152 }
1153 var upstreamChannels map[int64][]string
1154 if len(msg.Params) > 0 {
1155 upstreamChannels = make(map[int64][]string)
1156 channels := strings.Split(msg.Params[0], ",")
1157 for _, channel := range channels {
1158 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1159 if err != nil {
1160 return err
1161 }
1162 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1163 }
1164 }
1165
1166 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1167 dc.forEachUpstream(func(uc *upstreamConn) {
1168 var params []string
1169 if upstreamChannels != nil {
1170 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1171 params = []string{strings.Join(channels, ",")}
1172 } else {
1173 return
1174 }
1175 }
1176 pl.pendingCommands[uc.network.ID] = &irc.Message{
1177 Command: "LIST",
1178 Params: params,
1179 }
1180 uc.trySendLIST(dc.id)
1181 })
1182 case "NAMES":
1183 if len(msg.Params) == 0 {
1184 dc.SendMessage(&irc.Message{
1185 Prefix: dc.srv.prefix(),
1186 Command: irc.RPL_ENDOFNAMES,
1187 Params: []string{dc.nick, "*", "End of /NAMES list"},
1188 })
1189 return nil
1190 }
1191
1192 channels := strings.Split(msg.Params[0], ",")
1193 for _, channel := range channels {
1194 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1195 if err != nil {
1196 return err
1197 }
1198
1199 ch, ok := uc.channels[upstreamChannel]
1200 if ok {
1201 sendNames(dc, ch)
1202 } else {
1203 // NAMES on a channel we have not joined, ask upstream
1204 uc.SendMessageLabeled(dc.id, &irc.Message{
1205 Command: "NAMES",
1206 Params: []string{upstreamChannel},
1207 })
1208 }
1209 }
1210 case "WHO":
1211 if len(msg.Params) == 0 {
1212 // TODO: support WHO without parameters
1213 dc.SendMessage(&irc.Message{
1214 Prefix: dc.srv.prefix(),
1215 Command: irc.RPL_ENDOFWHO,
1216 Params: []string{dc.nick, "*", "End of /WHO list"},
1217 })
1218 return nil
1219 }
1220
1221 // TODO: support WHO masks
1222 entity := msg.Params[0]
1223
1224 if entity == dc.nick {
1225 // TODO: support AWAY (H/G) in self WHO reply
1226 dc.SendMessage(&irc.Message{
1227 Prefix: dc.srv.prefix(),
1228 Command: irc.RPL_WHOREPLY,
1229 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1230 })
1231 dc.SendMessage(&irc.Message{
1232 Prefix: dc.srv.prefix(),
1233 Command: irc.RPL_ENDOFWHO,
1234 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1235 })
1236 return nil
1237 }
1238
1239 uc, upstreamName, err := dc.unmarshalEntity(entity)
1240 if err != nil {
1241 return err
1242 }
1243
1244 var params []string
1245 if len(msg.Params) == 2 {
1246 params = []string{upstreamName, msg.Params[1]}
1247 } else {
1248 params = []string{upstreamName}
1249 }
1250
1251 uc.SendMessageLabeled(dc.id, &irc.Message{
1252 Command: "WHO",
1253 Params: params,
1254 })
1255 case "WHOIS":
1256 if len(msg.Params) == 0 {
1257 return ircError{&irc.Message{
1258 Command: irc.ERR_NONICKNAMEGIVEN,
1259 Params: []string{dc.nick, "No nickname given"},
1260 }}
1261 }
1262
1263 var target, mask string
1264 if len(msg.Params) == 1 {
1265 target = ""
1266 mask = msg.Params[0]
1267 } else {
1268 target = msg.Params[0]
1269 mask = msg.Params[1]
1270 }
1271 // TODO: support multiple WHOIS users
1272 if i := strings.IndexByte(mask, ','); i >= 0 {
1273 mask = mask[:i]
1274 }
1275
1276 if mask == dc.nick {
1277 dc.SendMessage(&irc.Message{
1278 Prefix: dc.srv.prefix(),
1279 Command: irc.RPL_WHOISUSER,
1280 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1281 })
1282 dc.SendMessage(&irc.Message{
1283 Prefix: dc.srv.prefix(),
1284 Command: irc.RPL_WHOISSERVER,
1285 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1286 })
1287 dc.SendMessage(&irc.Message{
1288 Prefix: dc.srv.prefix(),
1289 Command: irc.RPL_ENDOFWHOIS,
1290 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1291 })
1292 return nil
1293 }
1294
1295 // TODO: support WHOIS masks
1296 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1297 if err != nil {
1298 return err
1299 }
1300
1301 var params []string
1302 if target != "" {
1303 params = []string{target, upstreamNick}
1304 } else {
1305 params = []string{upstreamNick}
1306 }
1307
1308 uc.SendMessageLabeled(dc.id, &irc.Message{
1309 Command: "WHOIS",
1310 Params: params,
1311 })
1312 case "PRIVMSG":
1313 var targetsStr, text string
1314 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1315 return err
1316 }
1317
1318 for _, name := range strings.Split(targetsStr, ",") {
1319 if name == serviceNick {
1320 handleServicePRIVMSG(dc, text)
1321 continue
1322 }
1323
1324 uc, upstreamName, err := dc.unmarshalEntity(name)
1325 if err != nil {
1326 return err
1327 }
1328
1329 if upstreamName == "NickServ" {
1330 dc.handleNickServPRIVMSG(uc, text)
1331 }
1332
1333 unmarshaledText := text
1334 if uc.isChannel(upstreamName) {
1335 unmarshaledText = dc.unmarshalText(uc, text)
1336 }
1337 uc.SendMessage(&irc.Message{
1338 Command: "PRIVMSG",
1339 Params: []string{upstreamName, unmarshaledText},
1340 })
1341
1342 echoMsg := &irc.Message{
1343 Prefix: &irc.Prefix{
1344 Name: uc.nick,
1345 User: uc.username,
1346 },
1347 Command: "PRIVMSG",
1348 Params: []string{upstreamName, text},
1349 }
1350
1351 uc.produce(upstreamName, echoMsg, dc)
1352 }
1353 case "NOTICE":
1354 var targetsStr, text string
1355 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1356 return err
1357 }
1358
1359 for _, name := range strings.Split(targetsStr, ",") {
1360 uc, upstreamName, err := dc.unmarshalEntity(name)
1361 if err != nil {
1362 return err
1363 }
1364
1365 unmarshaledText := text
1366 if uc.isChannel(upstreamName) {
1367 unmarshaledText = dc.unmarshalText(uc, text)
1368 }
1369 uc.SendMessage(&irc.Message{
1370 Command: "NOTICE",
1371 Params: []string{upstreamName, unmarshaledText},
1372 })
1373 }
1374 case "INVITE":
1375 var user, channel string
1376 if err := parseMessageParams(msg, &user, &channel); err != nil {
1377 return err
1378 }
1379
1380 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1381 if err != nil {
1382 return err
1383 }
1384
1385 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1386 if err != nil {
1387 return err
1388 }
1389
1390 if ucChannel != ucUser {
1391 return ircError{&irc.Message{
1392 Command: irc.ERR_USERNOTINCHANNEL,
1393 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
1394 }}
1395 }
1396 uc := ucChannel
1397
1398 uc.SendMessageLabeled(dc.id, &irc.Message{
1399 Command: "INVITE",
1400 Params: []string{upstreamUser, upstreamChannel},
1401 })
1402 default:
1403 dc.logger.Printf("unhandled message: %v", msg)
1404 return newUnknownCommandError(msg.Command)
1405 }
1406 return nil
1407}
1408
1409func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1410 username, password, ok := parseNickServCredentials(text, uc.nick)
1411 if !ok {
1412 return
1413 }
1414
1415 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1416 n := uc.network
1417 n.SASL.Mechanism = "PLAIN"
1418 n.SASL.Plain.Username = username
1419 n.SASL.Plain.Password = password
1420 if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
1421 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1422 }
1423}
1424
1425func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1426 fields := strings.Fields(text)
1427 if len(fields) < 2 {
1428 return "", "", false
1429 }
1430 cmd := strings.ToUpper(fields[0])
1431 params := fields[1:]
1432 switch cmd {
1433 case "REGISTER":
1434 username = nick
1435 password = params[0]
1436 case "IDENTIFY":
1437 if len(params) == 1 {
1438 username = nick
1439 password = params[0]
1440 } else {
1441 username = params[0]
1442 password = params[1]
1443 }
1444 case "SET":
1445 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1446 username = nick
1447 password = params[1]
1448 }
1449 }
1450 return username, password, true
1451}
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