source: code/trunk/downstream.go@ 535

Last change on this file since 535 was 535, checked in by contact, 4 years ago

Introduce the soju.im/bouncer-networks-notify capability
File size: 55.8 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
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60func parseBouncerNetID(subcommand, s string) (int64, error) {
61 id, err := strconv.ParseInt(s, 10, 64)
62 if err != nil {
63 return 0, ircError{&irc.Message{
64 Command: "FAIL",
65 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
66 }}
67 }
68 return id, nil
69}
70
71func getNetworkAttrs(network *network) irc.Tags {
72 state := "disconnected"
73 if uc := network.conn; uc != nil {
74 state = "connected"
75 }
76
77 attrs := irc.Tags{
78 "name": irc.TagValue(network.GetName()),
79 "state": irc.TagValue(state),
80 "nickname": irc.TagValue(network.Nick),
81 }
82
83 if network.Username != "" {
84 attrs["username"] = irc.TagValue(network.Username)
85 }
86 if network.Realname != "" {
87 attrs["realname"] = irc.TagValue(network.Realname)
88 }
89
90 if u, err := network.URL(); err == nil {
91 hasHostPort := true
92 switch u.Scheme {
93 case "ircs":
94 attrs["tls"] = irc.TagValue("1")
95 case "irc+insecure":
96 attrs["tls"] = irc.TagValue("0")
97 default:
98 hasHostPort = false
99 }
100 if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
101 attrs["host"] = irc.TagValue(host)
102 attrs["port"] = irc.TagValue(port)
103 } else if hasHostPort {
104 attrs["host"] = irc.TagValue(u.Host)
105 }
106 }
107
108 return attrs
109}
110
111// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
112// '*' and '?' break masks
113const illegalNickChars = " :@!*?"
114
115// permanentDownstreamCaps is the list of always-supported downstream
116// capabilities.
117var permanentDownstreamCaps = map[string]string{
118 "batch": "",
119 "cap-notify": "",
120 "echo-message": "",
121 "invite-notify": "",
122 "message-tags": "",
123 "sasl": "PLAIN",
124 "server-time": "",
125
126 "soju.im/bouncer-networks": "",
127 "soju.im/bouncer-networks-notify": "",
128}
129
130// needAllDownstreamCaps is the list of downstream capabilities that
131// require support from all upstreams to be enabled
132var needAllDownstreamCaps = map[string]string{
133 "away-notify": "",
134 "extended-join": "",
135 "multi-prefix": "",
136}
137
138// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
139// through from the upstream server to downstream clients.
140//
141// This is only effective in single-upstream mode.
142var passthroughIsupport = map[string]bool{
143 "AWAYLEN": true,
144 "BOT": true,
145 "CHANLIMIT": true,
146 "CHANMODES": true,
147 "CHANNELLEN": true,
148 "CHANTYPES": true,
149 "EXCEPTS": true,
150 "EXTBAN": true,
151 "HOSTLEN": true,
152 "INVEX": true,
153 "KICKLEN": true,
154 "MAXLIST": true,
155 "MAXTARGETS": true,
156 "MODES": true,
157 "NETWORK": true,
158 "NICKLEN": true,
159 "PREFIX": true,
160 "SAFELIST": true,
161 "TARGMAX": true,
162 "TOPICLEN": true,
163 "USERLEN": true,
164}
165
166type downstreamConn struct {
167 conn
168
169 id uint64
170
171 registered bool
172 user *user
173 nick string
174 nickCM string
175 rawUsername string
176 networkName string
177 clientName string
178 realname string
179 hostname string
180 password string // empty after authentication
181 network *network // can be nil
182
183 negociatingCaps bool
184 capVersion int
185 supportedCaps map[string]string
186 caps map[string]bool
187
188 saslServer sasl.Server
189}
190
191func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
192 remoteAddr := ic.RemoteAddr().String()
193 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
194 options := connOptions{Logger: logger}
195 dc := &downstreamConn{
196 conn: *newConn(srv, ic, &options),
197 id: id,
198 supportedCaps: make(map[string]string),
199 caps: make(map[string]bool),
200 }
201 dc.hostname = remoteAddr
202 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
203 dc.hostname = host
204 }
205 for k, v := range permanentDownstreamCaps {
206 dc.supportedCaps[k] = v
207 }
208 if srv.LogPath != "" {
209 dc.supportedCaps["draft/chathistory"] = ""
210 }
211 return dc
212}
213
214func (dc *downstreamConn) prefix() *irc.Prefix {
215 return &irc.Prefix{
216 Name: dc.nick,
217 User: dc.user.Username,
218 Host: dc.hostname,
219 }
220}
221
222func (dc *downstreamConn) forEachNetwork(f func(*network)) {
223 if dc.network != nil {
224 f(dc.network)
225 } else if !dc.caps["soju.im/bouncer-networks"] {
226 dc.user.forEachNetwork(f)
227 }
228}
229
230func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
231 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
232 return
233 }
234 dc.user.forEachUpstream(func(uc *upstreamConn) {
235 if dc.network != nil && uc.network != dc.network {
236 return
237 }
238 f(uc)
239 })
240}
241
242// upstream returns the upstream connection, if any. If there are zero or if
243// there are multiple upstream connections, it returns nil.
244func (dc *downstreamConn) upstream() *upstreamConn {
245 if dc.network == nil {
246 return nil
247 }
248 return dc.network.conn
249}
250
251func isOurNick(net *network, nick string) bool {
252 // TODO: this doesn't account for nick changes
253 if net.conn != nil {
254 return net.casemap(nick) == net.conn.nickCM
255 }
256 // We're not currently connected to the upstream connection, so we don't
257 // know whether this name is our nickname. Best-effort: use the network's
258 // configured nickname and hope it was the one being used when we were
259 // connected.
260 return net.casemap(nick) == net.casemap(net.Nick)
261}
262
263// marshalEntity converts an upstream entity name (ie. channel or nick) into a
264// downstream entity name.
265//
266// This involves adding a "/<network>" suffix if the entity isn't the current
267// user.
268func (dc *downstreamConn) marshalEntity(net *network, name string) string {
269 if isOurNick(net, name) {
270 return dc.nick
271 }
272 name = partialCasemap(net.casemap, name)
273 if dc.network != nil {
274 if dc.network != net {
275 panic("soju: tried to marshal an entity for another network")
276 }
277 return name
278 }
279 return name + "/" + net.GetName()
280}
281
282func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
283 if isOurNick(net, prefix.Name) {
284 return dc.prefix()
285 }
286 prefix.Name = partialCasemap(net.casemap, prefix.Name)
287 if dc.network != nil {
288 if dc.network != net {
289 panic("soju: tried to marshal a user prefix for another network")
290 }
291 return prefix
292 }
293 return &irc.Prefix{
294 Name: prefix.Name + "/" + net.GetName(),
295 User: prefix.User,
296 Host: prefix.Host,
297 }
298}
299
300// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
301// an upstream entity name.
302//
303// This involves removing the "/<network>" suffix.
304func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
305 if uc := dc.upstream(); uc != nil {
306 return uc, name, nil
307 }
308 if dc.network != nil {
309 return nil, "", ircError{&irc.Message{
310 Command: irc.ERR_NOSUCHCHANNEL,
311 Params: []string{name, "Disconnected from upstream network"},
312 }}
313 }
314
315 var conn *upstreamConn
316 if i := strings.LastIndexByte(name, '/'); i >= 0 {
317 network := name[i+1:]
318 name = name[:i]
319
320 dc.forEachUpstream(func(uc *upstreamConn) {
321 if network != uc.network.GetName() {
322 return
323 }
324 conn = uc
325 })
326 }
327
328 if conn == nil {
329 return nil, "", ircError{&irc.Message{
330 Command: irc.ERR_NOSUCHCHANNEL,
331 Params: []string{name, "Missing network suffix in channel name"},
332 }}
333 }
334 return conn, name, nil
335}
336
337func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
338 if dc.upstream() != nil {
339 return text
340 }
341 // TODO: smarter parsing that ignores URLs
342 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
343}
344
345func (dc *downstreamConn) readMessages(ch chan<- event) error {
346 for {
347 msg, err := dc.ReadMessage()
348 if err == io.EOF {
349 break
350 } else if err != nil {
351 return fmt.Errorf("failed to read IRC command: %v", err)
352 }
353
354 ch <- eventDownstreamMessage{msg, dc}
355 }
356
357 return nil
358}
359
360// SendMessage sends an outgoing message.
361//
362// This can only called from the user goroutine.
363func (dc *downstreamConn) SendMessage(msg *irc.Message) {
364 if !dc.caps["message-tags"] {
365 if msg.Command == "TAGMSG" {
366 return
367 }
368 msg = msg.Copy()
369 for name := range msg.Tags {
370 supported := false
371 switch name {
372 case "time":
373 supported = dc.caps["server-time"]
374 }
375 if !supported {
376 delete(msg.Tags, name)
377 }
378 }
379 }
380 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
381 msg.Params = msg.Params[:1]
382 }
383
384 dc.conn.SendMessage(msg)
385}
386
387// sendMessageWithID sends an outgoing message with the specified internal ID.
388func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
389 dc.SendMessage(msg)
390
391 if id == "" || !dc.messageSupportsHistory(msg) {
392 return
393 }
394
395 dc.sendPing(id)
396}
397
398// advanceMessageWithID advances history to the specified message ID without
399// sending a message. This is useful e.g. for self-messages when echo-message
400// isn't enabled.
401func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
402 if id == "" || !dc.messageSupportsHistory(msg) {
403 return
404 }
405
406 dc.sendPing(id)
407}
408
409// ackMsgID acknowledges that a message has been received.
410func (dc *downstreamConn) ackMsgID(id string) {
411 netID, entity, err := parseMsgID(id, nil)
412 if err != nil {
413 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
414 return
415 }
416
417 network := dc.user.getNetworkByID(netID)
418 if network == nil {
419 return
420 }
421
422 network.delivered.StoreID(entity, dc.clientName, id)
423}
424
425func (dc *downstreamConn) sendPing(msgID string) {
426 token := "soju-msgid-" + msgID
427 dc.SendMessage(&irc.Message{
428 Command: "PING",
429 Params: []string{token},
430 })
431}
432
433func (dc *downstreamConn) handlePong(token string) {
434 if !strings.HasPrefix(token, "soju-msgid-") {
435 dc.logger.Printf("received unrecognized PONG token %q", token)
436 return
437 }
438 msgID := strings.TrimPrefix(token, "soju-msgid-")
439 dc.ackMsgID(msgID)
440}
441
442// marshalMessage re-formats a message coming from an upstream connection so
443// that it's suitable for being sent on this downstream connection. Only
444// messages that may appear in logs are supported, except MODE.
445func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
446 msg = msg.Copy()
447 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
448
449 switch msg.Command {
450 case "PRIVMSG", "NOTICE", "TAGMSG":
451 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
452 case "NICK":
453 // Nick change for another user
454 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
455 case "JOIN", "PART":
456 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
457 case "KICK":
458 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
459 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
460 case "TOPIC":
461 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
462 case "QUIT":
463 // This space is intentionally left blank
464 default:
465 panic(fmt.Sprintf("unexpected %q message", msg.Command))
466 }
467
468 return msg
469}
470
471func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
472 switch msg.Command {
473 case "QUIT":
474 return dc.Close()
475 default:
476 if dc.registered {
477 return dc.handleMessageRegistered(msg)
478 } else {
479 return dc.handleMessageUnregistered(msg)
480 }
481 }
482}
483
484func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
485 switch msg.Command {
486 case "NICK":
487 var nick string
488 if err := parseMessageParams(msg, &nick); err != nil {
489 return err
490 }
491 if strings.ContainsAny(nick, illegalNickChars) {
492 return ircError{&irc.Message{
493 Command: irc.ERR_ERRONEUSNICKNAME,
494 Params: []string{dc.nick, nick, "contains illegal characters"},
495 }}
496 }
497 nickCM := casemapASCII(nick)
498 if nickCM == serviceNickCM {
499 return ircError{&irc.Message{
500 Command: irc.ERR_NICKNAMEINUSE,
501 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
502 }}
503 }
504 dc.nick = nick
505 dc.nickCM = nickCM
506 case "USER":
507 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
508 return err
509 }
510 case "PASS":
511 if err := parseMessageParams(msg, &dc.password); err != nil {
512 return err
513 }
514 case "CAP":
515 var subCmd string
516 if err := parseMessageParams(msg, &subCmd); err != nil {
517 return err
518 }
519 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
520 return err
521 }
522 case "AUTHENTICATE":
523 if !dc.caps["sasl"] {
524 return ircError{&irc.Message{
525 Command: irc.ERR_SASLFAIL,
526 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
527 }}
528 }
529 if len(msg.Params) == 0 {
530 return ircError{&irc.Message{
531 Command: irc.ERR_SASLFAIL,
532 Params: []string{"*", "Missing AUTHENTICATE argument"},
533 }}
534 }
535 if dc.nick == "" {
536 return ircError{&irc.Message{
537 Command: irc.ERR_SASLFAIL,
538 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
539 }}
540 }
541
542 var resp []byte
543 if dc.saslServer == nil {
544 mech := strings.ToUpper(msg.Params[0])
545 switch mech {
546 case "PLAIN":
547 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
548 return dc.authenticate(username, password)
549 }))
550 default:
551 return ircError{&irc.Message{
552 Command: irc.ERR_SASLFAIL,
553 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
554 }}
555 }
556 } else if msg.Params[0] == "*" {
557 dc.saslServer = nil
558 return ircError{&irc.Message{
559 Command: irc.ERR_SASLABORTED,
560 Params: []string{"*", "SASL authentication aborted"},
561 }}
562 } else if msg.Params[0] == "+" {
563 resp = nil
564 } else {
565 // TODO: multi-line messages
566 var err error
567 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
568 if err != nil {
569 dc.saslServer = nil
570 return ircError{&irc.Message{
571 Command: irc.ERR_SASLFAIL,
572 Params: []string{"*", "Invalid base64-encoded response"},
573 }}
574 }
575 }
576
577 challenge, done, err := dc.saslServer.Next(resp)
578 if err != nil {
579 dc.saslServer = nil
580 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
581 return ircError{&irc.Message{
582 Command: irc.ERR_SASLFAIL,
583 Params: []string{"*", ircErr.Message.Params[1]},
584 }}
585 }
586 dc.SendMessage(&irc.Message{
587 Prefix: dc.srv.prefix(),
588 Command: irc.ERR_SASLFAIL,
589 Params: []string{"*", "SASL error"},
590 })
591 return fmt.Errorf("SASL authentication failed: %v", err)
592 } else if done {
593 dc.saslServer = nil
594 dc.SendMessage(&irc.Message{
595 Prefix: dc.srv.prefix(),
596 Command: irc.RPL_LOGGEDIN,
597 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
598 })
599 dc.SendMessage(&irc.Message{
600 Prefix: dc.srv.prefix(),
601 Command: irc.RPL_SASLSUCCESS,
602 Params: []string{dc.nick, "SASL authentication successful"},
603 })
604 } else {
605 challengeStr := "+"
606 if len(challenge) > 0 {
607 challengeStr = base64.StdEncoding.EncodeToString(challenge)
608 }
609
610 // TODO: multi-line messages
611 dc.SendMessage(&irc.Message{
612 Prefix: dc.srv.prefix(),
613 Command: "AUTHENTICATE",
614 Params: []string{challengeStr},
615 })
616 }
617 case "BOUNCER":
618 var subcommand string
619 if err := parseMessageParams(msg, &subcommand); err != nil {
620 return err
621 }
622
623 switch strings.ToUpper(subcommand) {
624 case "BIND":
625 var idStr string
626 if err := parseMessageParams(msg, nil, &idStr); err != nil {
627 return err
628 }
629
630 if dc.registered {
631 return ircError{&irc.Message{
632 Command: "FAIL",
633 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind bouncer network after registration"},
634 }}
635 }
636 if dc.user == nil {
637 return ircError{&irc.Message{
638 Command: "FAIL",
639 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
640 }}
641 }
642
643 id, err := parseBouncerNetID(subcommand, idStr)
644 if err != nil {
645 return err
646 }
647
648 var match *network
649 dc.user.forEachNetwork(func(net *network) {
650 if net.ID == id {
651 match = net
652 }
653 })
654 if match == nil {
655 return ircError{&irc.Message{
656 Command: "FAIL",
657 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
658 }}
659 }
660
661 dc.networkName = match.GetName()
662 }
663 default:
664 dc.logger.Printf("unhandled message: %v", msg)
665 return newUnknownCommandError(msg.Command)
666 }
667 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
668 return dc.register()
669 }
670 return nil
671}
672
673func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
674 cmd = strings.ToUpper(cmd)
675
676 replyTo := dc.nick
677 if !dc.registered {
678 replyTo = "*"
679 }
680
681 switch cmd {
682 case "LS":
683 if len(args) > 0 {
684 var err error
685 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
686 return err
687 }
688 }
689 if !dc.registered && dc.capVersion >= 302 {
690 // Let downstream show everything it supports, and trim
691 // down the available capabilities when upstreams are
692 // known.
693 for k, v := range needAllDownstreamCaps {
694 dc.supportedCaps[k] = v
695 }
696 }
697
698 caps := make([]string, 0, len(dc.supportedCaps))
699 for k, v := range dc.supportedCaps {
700 if dc.capVersion >= 302 && v != "" {
701 caps = append(caps, k+"="+v)
702 } else {
703 caps = append(caps, k)
704 }
705 }
706
707 // TODO: multi-line replies
708 dc.SendMessage(&irc.Message{
709 Prefix: dc.srv.prefix(),
710 Command: "CAP",
711 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
712 })
713
714 if dc.capVersion >= 302 {
715 // CAP version 302 implicitly enables cap-notify
716 dc.caps["cap-notify"] = true
717 }
718
719 if !dc.registered {
720 dc.negociatingCaps = true
721 }
722 case "LIST":
723 var caps []string
724 for name, enabled := range dc.caps {
725 if enabled {
726 caps = append(caps, name)
727 }
728 }
729
730 // TODO: multi-line replies
731 dc.SendMessage(&irc.Message{
732 Prefix: dc.srv.prefix(),
733 Command: "CAP",
734 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
735 })
736 case "REQ":
737 if len(args) == 0 {
738 return ircError{&irc.Message{
739 Command: err_invalidcapcmd,
740 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
741 }}
742 }
743
744 // TODO: atomically ack/nak the whole capability set
745 caps := strings.Fields(args[0])
746 ack := true
747 for _, name := range caps {
748 name = strings.ToLower(name)
749 enable := !strings.HasPrefix(name, "-")
750 if !enable {
751 name = strings.TrimPrefix(name, "-")
752 }
753
754 if enable == dc.caps[name] {
755 continue
756 }
757
758 _, ok := dc.supportedCaps[name]
759 if !ok {
760 ack = false
761 break
762 }
763
764 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
765 // cap-notify cannot be disabled with CAP version 302
766 ack = false
767 break
768 }
769
770 dc.caps[name] = enable
771 }
772
773 reply := "NAK"
774 if ack {
775 reply = "ACK"
776 }
777 dc.SendMessage(&irc.Message{
778 Prefix: dc.srv.prefix(),
779 Command: "CAP",
780 Params: []string{replyTo, reply, args[0]},
781 })
782 case "END":
783 dc.negociatingCaps = false
784 default:
785 return ircError{&irc.Message{
786 Command: err_invalidcapcmd,
787 Params: []string{replyTo, cmd, "Unknown CAP command"},
788 }}
789 }
790 return nil
791}
792
793func (dc *downstreamConn) setSupportedCap(name, value string) {
794 prevValue, hasPrev := dc.supportedCaps[name]
795 changed := !hasPrev || prevValue != value
796 dc.supportedCaps[name] = value
797
798 if !dc.caps["cap-notify"] || !changed {
799 return
800 }
801
802 replyTo := dc.nick
803 if !dc.registered {
804 replyTo = "*"
805 }
806
807 cap := name
808 if value != "" && dc.capVersion >= 302 {
809 cap = name + "=" + value
810 }
811
812 dc.SendMessage(&irc.Message{
813 Prefix: dc.srv.prefix(),
814 Command: "CAP",
815 Params: []string{replyTo, "NEW", cap},
816 })
817}
818
819func (dc *downstreamConn) unsetSupportedCap(name string) {
820 _, hasPrev := dc.supportedCaps[name]
821 delete(dc.supportedCaps, name)
822 delete(dc.caps, name)
823
824 if !dc.caps["cap-notify"] || !hasPrev {
825 return
826 }
827
828 replyTo := dc.nick
829 if !dc.registered {
830 replyTo = "*"
831 }
832
833 dc.SendMessage(&irc.Message{
834 Prefix: dc.srv.prefix(),
835 Command: "CAP",
836 Params: []string{replyTo, "DEL", name},
837 })
838}
839
840func (dc *downstreamConn) updateSupportedCaps() {
841 supportedCaps := make(map[string]bool)
842 for cap := range needAllDownstreamCaps {
843 supportedCaps[cap] = true
844 }
845 dc.forEachUpstream(func(uc *upstreamConn) {
846 for cap, supported := range supportedCaps {
847 supportedCaps[cap] = supported && uc.caps[cap]
848 }
849 })
850
851 for cap, supported := range supportedCaps {
852 if supported {
853 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
854 } else {
855 dc.unsetSupportedCap(cap)
856 }
857 }
858}
859
860func (dc *downstreamConn) updateNick() {
861 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
862 dc.SendMessage(&irc.Message{
863 Prefix: dc.prefix(),
864 Command: "NICK",
865 Params: []string{uc.nick},
866 })
867 dc.nick = uc.nick
868 dc.nickCM = casemapASCII(dc.nick)
869 }
870}
871
872func sanityCheckServer(addr string) error {
873 dialer := net.Dialer{Timeout: 30 * time.Second}
874 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
875 if err != nil {
876 return err
877 }
878 return conn.Close()
879}
880
881func unmarshalUsername(rawUsername string) (username, client, network string) {
882 username = rawUsername
883
884 i := strings.IndexAny(username, "/@")
885 j := strings.LastIndexAny(username, "/@")
886 if i >= 0 {
887 username = rawUsername[:i]
888 }
889 if j >= 0 {
890 if rawUsername[j] == '@' {
891 client = rawUsername[j+1:]
892 } else {
893 network = rawUsername[j+1:]
894 }
895 }
896 if i >= 0 && j >= 0 && i < j {
897 if rawUsername[i] == '@' {
898 client = rawUsername[i+1 : j]
899 } else {
900 network = rawUsername[i+1 : j]
901 }
902 }
903
904 return username, client, network
905}
906
907func (dc *downstreamConn) authenticate(username, password string) error {
908 username, clientName, networkName := unmarshalUsername(username)
909
910 u, err := dc.srv.db.GetUser(username)
911 if err != nil {
912 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
913 return errAuthFailed
914 }
915
916 // Password auth disabled
917 if u.Password == "" {
918 return errAuthFailed
919 }
920
921 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
922 if err != nil {
923 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
924 return errAuthFailed
925 }
926
927 dc.user = dc.srv.getUser(username)
928 if dc.user == nil {
929 dc.logger.Printf("failed authentication for %q: user not active", username)
930 return errAuthFailed
931 }
932 dc.clientName = clientName
933 dc.networkName = networkName
934 return nil
935}
936
937func (dc *downstreamConn) register() error {
938 if dc.registered {
939 return fmt.Errorf("tried to register twice")
940 }
941
942 password := dc.password
943 dc.password = ""
944 if dc.user == nil {
945 if err := dc.authenticate(dc.rawUsername, password); err != nil {
946 return err
947 }
948 }
949
950 if dc.clientName == "" && dc.networkName == "" {
951 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
952 }
953
954 dc.registered = true
955 dc.logger.Printf("registration complete for user %q", dc.user.Username)
956 return nil
957}
958
959func (dc *downstreamConn) loadNetwork() error {
960 if dc.networkName == "" {
961 return nil
962 }
963
964 network := dc.user.getNetwork(dc.networkName)
965 if network == nil {
966 addr := dc.networkName
967 if !strings.ContainsRune(addr, ':') {
968 addr = addr + ":6697"
969 }
970
971 dc.logger.Printf("trying to connect to new network %q", addr)
972 if err := sanityCheckServer(addr); err != nil {
973 dc.logger.Printf("failed to connect to %q: %v", addr, err)
974 return ircError{&irc.Message{
975 Command: irc.ERR_PASSWDMISMATCH,
976 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
977 }}
978 }
979
980 // Some clients only allow specifying the nickname (and use the
981 // nickname as a username too). Strip the network name from the
982 // nickname when auto-saving networks.
983 nick, _, _ := unmarshalUsername(dc.nick)
984
985 dc.logger.Printf("auto-saving network %q", dc.networkName)
986 var err error
987 network, err = dc.user.createNetwork(&Network{
988 Addr: dc.networkName,
989 Nick: nick,
990 })
991 if err != nil {
992 return err
993 }
994 }
995
996 dc.network = network
997 return nil
998}
999
1000func (dc *downstreamConn) welcome() error {
1001 if dc.user == nil || !dc.registered {
1002 panic("tried to welcome an unregistered connection")
1003 }
1004
1005 // TODO: doing this might take some time. We should do it in dc.register
1006 // instead, but we'll potentially be adding a new network and this must be
1007 // done in the user goroutine.
1008 if err := dc.loadNetwork(); err != nil {
1009 return err
1010 }
1011
1012 isupport := []string{
1013 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
1014 "CASEMAPPING=ascii",
1015 }
1016
1017 if dc.network != nil {
1018 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1019 }
1020
1021 if uc := dc.upstream(); uc != nil {
1022 for k := range passthroughIsupport {
1023 v, ok := uc.isupport[k]
1024 if !ok {
1025 continue
1026 }
1027 if v != nil {
1028 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1029 } else {
1030 isupport = append(isupport, k)
1031 }
1032 }
1033 }
1034
1035 dc.SendMessage(&irc.Message{
1036 Prefix: dc.srv.prefix(),
1037 Command: irc.RPL_WELCOME,
1038 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1039 })
1040 dc.SendMessage(&irc.Message{
1041 Prefix: dc.srv.prefix(),
1042 Command: irc.RPL_YOURHOST,
1043 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1044 })
1045 dc.SendMessage(&irc.Message{
1046 Prefix: dc.srv.prefix(),
1047 Command: irc.RPL_CREATED,
1048 Params: []string{dc.nick, "Who cares when the server was created?"},
1049 })
1050 dc.SendMessage(&irc.Message{
1051 Prefix: dc.srv.prefix(),
1052 Command: irc.RPL_MYINFO,
1053 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1054 })
1055 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1056 dc.SendMessage(msg)
1057 }
1058 dc.SendMessage(&irc.Message{
1059 Prefix: dc.srv.prefix(),
1060 Command: irc.ERR_NOMOTD,
1061 Params: []string{dc.nick, "No MOTD"},
1062 })
1063
1064 dc.updateNick()
1065 dc.updateSupportedCaps()
1066
1067 if dc.caps["soju.im/bouncer-networks-notify"] {
1068 dc.SendMessage(&irc.Message{
1069 Prefix: dc.srv.prefix(),
1070 Command: "BATCH",
1071 Params: []string{"+networks", "bouncer-networks"},
1072 })
1073 dc.user.forEachNetwork(func(network *network) {
1074 idStr := fmt.Sprintf("%v", network.ID)
1075 attrs := getNetworkAttrs(network)
1076 dc.SendMessage(&irc.Message{
1077 Tags: irc.Tags{"batch": irc.TagValue("networks")},
1078 Prefix: dc.srv.prefix(),
1079 Command: "BOUNCER",
1080 Params: []string{"NETWORK", idStr, attrs.String()},
1081 })
1082 })
1083 dc.SendMessage(&irc.Message{
1084 Prefix: dc.srv.prefix(),
1085 Command: "BATCH",
1086 Params: []string{"-networks"},
1087 })
1088 }
1089
1090 dc.forEachUpstream(func(uc *upstreamConn) {
1091 for _, entry := range uc.channels.innerMap {
1092 ch := entry.value.(*upstreamChannel)
1093 if !ch.complete {
1094 continue
1095 }
1096 record := uc.network.channels.Value(ch.Name)
1097 if record != nil && record.Detached {
1098 continue
1099 }
1100
1101 dc.SendMessage(&irc.Message{
1102 Prefix: dc.prefix(),
1103 Command: "JOIN",
1104 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1105 })
1106
1107 forwardChannel(dc, ch)
1108 }
1109 })
1110
1111 dc.forEachNetwork(func(net *network) {
1112 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1113 return
1114 }
1115
1116 // Only send history if we're the first connected client with that name
1117 // for the network
1118 firstClient := true
1119 dc.user.forEachDownstream(func(c *downstreamConn) {
1120 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1121 firstClient = false
1122 }
1123 })
1124 if firstClient {
1125 net.delivered.ForEachTarget(func(target string) {
1126 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1127 if lastDelivered == "" {
1128 return
1129 }
1130
1131 dc.sendTargetBacklog(net, target, lastDelivered)
1132
1133 // Fast-forward history to last message
1134 targetCM := net.casemap(target)
1135 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1136 if err != nil {
1137 dc.logger.Printf("failed to get last message ID: %v", err)
1138 return
1139 }
1140 net.delivered.StoreID(target, dc.clientName, lastID)
1141 })
1142 }
1143 })
1144
1145 return nil
1146}
1147
1148// messageSupportsHistory checks whether the provided message can be sent as
1149// part of an history batch.
1150func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1151 // Don't replay all messages, because that would mess up client
1152 // state. For instance we just sent the list of users, sending
1153 // PART messages for one of these users would be incorrect.
1154 // TODO: add support for draft/event-playback
1155 switch msg.Command {
1156 case "PRIVMSG", "NOTICE":
1157 return true
1158 }
1159 return false
1160}
1161
1162func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1163 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1164 return
1165 }
1166
1167 ch := net.channels.Value(target)
1168
1169 limit := 4000
1170 targetCM := net.casemap(target)
1171 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1172 if err != nil {
1173 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1174 return
1175 }
1176
1177 batchRef := "history"
1178 if dc.caps["batch"] {
1179 dc.SendMessage(&irc.Message{
1180 Prefix: dc.srv.prefix(),
1181 Command: "BATCH",
1182 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1183 })
1184 }
1185
1186 for _, msg := range history {
1187 if !dc.messageSupportsHistory(msg) {
1188 continue
1189 }
1190
1191 if ch != nil && ch.Detached {
1192 if net.detachedMessageNeedsRelay(ch, msg) {
1193 dc.relayDetachedMessage(net, msg)
1194 }
1195 } else {
1196 if dc.caps["batch"] {
1197 msg.Tags["batch"] = irc.TagValue(batchRef)
1198 }
1199 dc.SendMessage(dc.marshalMessage(msg, net))
1200 }
1201 }
1202
1203 if dc.caps["batch"] {
1204 dc.SendMessage(&irc.Message{
1205 Prefix: dc.srv.prefix(),
1206 Command: "BATCH",
1207 Params: []string{"-" + batchRef},
1208 })
1209 }
1210}
1211
1212func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1213 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1214 return
1215 }
1216
1217 sender := msg.Prefix.Name
1218 target, text := msg.Params[0], msg.Params[1]
1219 if net.isHighlight(msg) {
1220 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1221 } else {
1222 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1223 }
1224}
1225
1226func (dc *downstreamConn) runUntilRegistered() error {
1227 for !dc.registered {
1228 msg, err := dc.ReadMessage()
1229 if err != nil {
1230 return fmt.Errorf("failed to read IRC command: %v", err)
1231 }
1232
1233 err = dc.handleMessage(msg)
1234 if ircErr, ok := err.(ircError); ok {
1235 ircErr.Message.Prefix = dc.srv.prefix()
1236 dc.SendMessage(ircErr.Message)
1237 } else if err != nil {
1238 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1239 }
1240 }
1241
1242 return nil
1243}
1244
1245func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1246 switch msg.Command {
1247 case "CAP":
1248 var subCmd string
1249 if err := parseMessageParams(msg, &subCmd); err != nil {
1250 return err
1251 }
1252 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1253 return err
1254 }
1255 case "PING":
1256 var source, destination string
1257 if err := parseMessageParams(msg, &source); err != nil {
1258 return err
1259 }
1260 if len(msg.Params) > 1 {
1261 destination = msg.Params[1]
1262 }
1263 if destination != "" && destination != dc.srv.Hostname {
1264 return ircError{&irc.Message{
1265 Command: irc.ERR_NOSUCHSERVER,
1266 Params: []string{dc.nick, destination, "No such server"},
1267 }}
1268 }
1269 dc.SendMessage(&irc.Message{
1270 Prefix: dc.srv.prefix(),
1271 Command: "PONG",
1272 Params: []string{dc.srv.Hostname, source},
1273 })
1274 return nil
1275 case "PONG":
1276 if len(msg.Params) == 0 {
1277 return newNeedMoreParamsError(msg.Command)
1278 }
1279 token := msg.Params[len(msg.Params)-1]
1280 dc.handlePong(token)
1281 case "USER":
1282 return ircError{&irc.Message{
1283 Command: irc.ERR_ALREADYREGISTERED,
1284 Params: []string{dc.nick, "You may not reregister"},
1285 }}
1286 case "NICK":
1287 var rawNick string
1288 if err := parseMessageParams(msg, &rawNick); err != nil {
1289 return err
1290 }
1291
1292 nick := rawNick
1293 var upstream *upstreamConn
1294 if dc.upstream() == nil {
1295 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1296 if err == nil { // NICK nick/network: NICK only on a specific upstream
1297 upstream = uc
1298 nick = unmarshaledNick
1299 }
1300 }
1301
1302 if strings.ContainsAny(nick, illegalNickChars) {
1303 return ircError{&irc.Message{
1304 Command: irc.ERR_ERRONEUSNICKNAME,
1305 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1306 }}
1307 }
1308 if casemapASCII(nick) == serviceNickCM {
1309 return ircError{&irc.Message{
1310 Command: irc.ERR_NICKNAMEINUSE,
1311 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1312 }}
1313 }
1314
1315 var err error
1316 dc.forEachNetwork(func(n *network) {
1317 if err != nil || (upstream != nil && upstream.network != n) {
1318 return
1319 }
1320 n.Nick = nick
1321 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1322 })
1323 if err != nil {
1324 return err
1325 }
1326
1327 dc.forEachUpstream(func(uc *upstreamConn) {
1328 if upstream != nil && upstream != uc {
1329 return
1330 }
1331 uc.SendMessageLabeled(dc.id, &irc.Message{
1332 Command: "NICK",
1333 Params: []string{nick},
1334 })
1335 })
1336
1337 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1338 dc.SendMessage(&irc.Message{
1339 Prefix: dc.prefix(),
1340 Command: "NICK",
1341 Params: []string{nick},
1342 })
1343 dc.nick = nick
1344 dc.nickCM = casemapASCII(dc.nick)
1345 }
1346 case "JOIN":
1347 var namesStr string
1348 if err := parseMessageParams(msg, &namesStr); err != nil {
1349 return err
1350 }
1351
1352 var keys []string
1353 if len(msg.Params) > 1 {
1354 keys = strings.Split(msg.Params[1], ",")
1355 }
1356
1357 for i, name := range strings.Split(namesStr, ",") {
1358 uc, upstreamName, err := dc.unmarshalEntity(name)
1359 if err != nil {
1360 return err
1361 }
1362
1363 var key string
1364 if len(keys) > i {
1365 key = keys[i]
1366 }
1367
1368 params := []string{upstreamName}
1369 if key != "" {
1370 params = append(params, key)
1371 }
1372 uc.SendMessageLabeled(dc.id, &irc.Message{
1373 Command: "JOIN",
1374 Params: params,
1375 })
1376
1377 ch := uc.network.channels.Value(upstreamName)
1378 if ch != nil {
1379 // Don't clear the channel key if there's one set
1380 // TODO: add a way to unset the channel key
1381 if key != "" {
1382 ch.Key = key
1383 }
1384 uc.network.attach(ch)
1385 } else {
1386 ch = &Channel{
1387 Name: upstreamName,
1388 Key: key,
1389 }
1390 uc.network.channels.SetValue(upstreamName, ch)
1391 }
1392 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1393 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1394 }
1395 }
1396 case "PART":
1397 var namesStr string
1398 if err := parseMessageParams(msg, &namesStr); err != nil {
1399 return err
1400 }
1401
1402 var reason string
1403 if len(msg.Params) > 1 {
1404 reason = msg.Params[1]
1405 }
1406
1407 for _, name := range strings.Split(namesStr, ",") {
1408 uc, upstreamName, err := dc.unmarshalEntity(name)
1409 if err != nil {
1410 return err
1411 }
1412
1413 if strings.EqualFold(reason, "detach") {
1414 ch := uc.network.channels.Value(upstreamName)
1415 if ch != nil {
1416 uc.network.detach(ch)
1417 } else {
1418 ch = &Channel{
1419 Name: name,
1420 Detached: true,
1421 }
1422 uc.network.channels.SetValue(upstreamName, ch)
1423 }
1424 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1425 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1426 }
1427 } else {
1428 params := []string{upstreamName}
1429 if reason != "" {
1430 params = append(params, reason)
1431 }
1432 uc.SendMessageLabeled(dc.id, &irc.Message{
1433 Command: "PART",
1434 Params: params,
1435 })
1436
1437 if err := uc.network.deleteChannel(upstreamName); err != nil {
1438 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1439 }
1440 }
1441 }
1442 case "KICK":
1443 var channelStr, userStr string
1444 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1445 return err
1446 }
1447
1448 channels := strings.Split(channelStr, ",")
1449 users := strings.Split(userStr, ",")
1450
1451 var reason string
1452 if len(msg.Params) > 2 {
1453 reason = msg.Params[2]
1454 }
1455
1456 if len(channels) != 1 && len(channels) != len(users) {
1457 return ircError{&irc.Message{
1458 Command: irc.ERR_BADCHANMASK,
1459 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1460 }}
1461 }
1462
1463 for i, user := range users {
1464 var channel string
1465 if len(channels) == 1 {
1466 channel = channels[0]
1467 } else {
1468 channel = channels[i]
1469 }
1470
1471 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1472 if err != nil {
1473 return err
1474 }
1475
1476 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1477 if err != nil {
1478 return err
1479 }
1480
1481 if ucChannel != ucUser {
1482 return ircError{&irc.Message{
1483 Command: irc.ERR_USERNOTINCHANNEL,
1484 Params: []string{dc.nick, user, channel, "They are on another network"},
1485 }}
1486 }
1487 uc := ucChannel
1488
1489 params := []string{upstreamChannel, upstreamUser}
1490 if reason != "" {
1491 params = append(params, reason)
1492 }
1493 uc.SendMessageLabeled(dc.id, &irc.Message{
1494 Command: "KICK",
1495 Params: params,
1496 })
1497 }
1498 case "MODE":
1499 var name string
1500 if err := parseMessageParams(msg, &name); err != nil {
1501 return err
1502 }
1503
1504 var modeStr string
1505 if len(msg.Params) > 1 {
1506 modeStr = msg.Params[1]
1507 }
1508
1509 if casemapASCII(name) == dc.nickCM {
1510 if modeStr != "" {
1511 dc.forEachUpstream(func(uc *upstreamConn) {
1512 uc.SendMessageLabeled(dc.id, &irc.Message{
1513 Command: "MODE",
1514 Params: []string{uc.nick, modeStr},
1515 })
1516 })
1517 } else {
1518 // TODO: only do this in multi-upstream mode
1519 dc.SendMessage(&irc.Message{
1520 Prefix: dc.srv.prefix(),
1521 Command: irc.RPL_UMODEIS,
1522 Params: []string{dc.nick, ""}, // TODO
1523 })
1524 }
1525 return nil
1526 }
1527
1528 uc, upstreamName, err := dc.unmarshalEntity(name)
1529 if err != nil {
1530 return err
1531 }
1532
1533 if !uc.isChannel(upstreamName) {
1534 return ircError{&irc.Message{
1535 Command: irc.ERR_USERSDONTMATCH,
1536 Params: []string{dc.nick, "Cannot change mode for other users"},
1537 }}
1538 }
1539
1540 if modeStr != "" {
1541 params := []string{upstreamName, modeStr}
1542 params = append(params, msg.Params[2:]...)
1543 uc.SendMessageLabeled(dc.id, &irc.Message{
1544 Command: "MODE",
1545 Params: params,
1546 })
1547 } else {
1548 ch := uc.channels.Value(upstreamName)
1549 if ch == nil {
1550 return ircError{&irc.Message{
1551 Command: irc.ERR_NOSUCHCHANNEL,
1552 Params: []string{dc.nick, name, "No such channel"},
1553 }}
1554 }
1555
1556 if ch.modes == nil {
1557 // we haven't received the initial RPL_CHANNELMODEIS yet
1558 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1559 return nil
1560 }
1561
1562 modeStr, modeParams := ch.modes.Format()
1563 params := []string{dc.nick, name, modeStr}
1564 params = append(params, modeParams...)
1565
1566 dc.SendMessage(&irc.Message{
1567 Prefix: dc.srv.prefix(),
1568 Command: irc.RPL_CHANNELMODEIS,
1569 Params: params,
1570 })
1571 if ch.creationTime != "" {
1572 dc.SendMessage(&irc.Message{
1573 Prefix: dc.srv.prefix(),
1574 Command: rpl_creationtime,
1575 Params: []string{dc.nick, name, ch.creationTime},
1576 })
1577 }
1578 }
1579 case "TOPIC":
1580 var channel string
1581 if err := parseMessageParams(msg, &channel); err != nil {
1582 return err
1583 }
1584
1585 uc, upstreamName, err := dc.unmarshalEntity(channel)
1586 if err != nil {
1587 return err
1588 }
1589
1590 if len(msg.Params) > 1 { // setting topic
1591 topic := msg.Params[1]
1592 uc.SendMessageLabeled(dc.id, &irc.Message{
1593 Command: "TOPIC",
1594 Params: []string{upstreamName, topic},
1595 })
1596 } else { // getting topic
1597 ch := uc.channels.Value(upstreamName)
1598 if ch == nil {
1599 return ircError{&irc.Message{
1600 Command: irc.ERR_NOSUCHCHANNEL,
1601 Params: []string{dc.nick, upstreamName, "No such channel"},
1602 }}
1603 }
1604 sendTopic(dc, ch)
1605 }
1606 case "LIST":
1607 // TODO: support ELIST when supported by all upstreams
1608
1609 pl := pendingLIST{
1610 downstreamID: dc.id,
1611 pendingCommands: make(map[int64]*irc.Message),
1612 }
1613 var upstream *upstreamConn
1614 var upstreamChannels map[int64][]string
1615 if len(msg.Params) > 0 {
1616 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1617 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1618 upstream = uc
1619 } else {
1620 upstreamChannels = make(map[int64][]string)
1621 channels := strings.Split(msg.Params[0], ",")
1622 for _, channel := range channels {
1623 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1624 if err != nil {
1625 return err
1626 }
1627 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1628 }
1629 }
1630 }
1631
1632 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1633 dc.forEachUpstream(func(uc *upstreamConn) {
1634 if upstream != nil && upstream != uc {
1635 return
1636 }
1637 var params []string
1638 if upstreamChannels != nil {
1639 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1640 params = []string{strings.Join(channels, ",")}
1641 } else {
1642 return
1643 }
1644 }
1645 pl.pendingCommands[uc.network.ID] = &irc.Message{
1646 Command: "LIST",
1647 Params: params,
1648 }
1649 uc.trySendLIST(dc.id)
1650 })
1651 case "NAMES":
1652 if len(msg.Params) == 0 {
1653 dc.SendMessage(&irc.Message{
1654 Prefix: dc.srv.prefix(),
1655 Command: irc.RPL_ENDOFNAMES,
1656 Params: []string{dc.nick, "*", "End of /NAMES list"},
1657 })
1658 return nil
1659 }
1660
1661 channels := strings.Split(msg.Params[0], ",")
1662 for _, channel := range channels {
1663 uc, upstreamName, err := dc.unmarshalEntity(channel)
1664 if err != nil {
1665 return err
1666 }
1667
1668 ch := uc.channels.Value(upstreamName)
1669 if ch != nil {
1670 sendNames(dc, ch)
1671 } else {
1672 // NAMES on a channel we have not joined, ask upstream
1673 uc.SendMessageLabeled(dc.id, &irc.Message{
1674 Command: "NAMES",
1675 Params: []string{upstreamName},
1676 })
1677 }
1678 }
1679 case "WHO":
1680 if len(msg.Params) == 0 {
1681 // TODO: support WHO without parameters
1682 dc.SendMessage(&irc.Message{
1683 Prefix: dc.srv.prefix(),
1684 Command: irc.RPL_ENDOFWHO,
1685 Params: []string{dc.nick, "*", "End of /WHO list"},
1686 })
1687 return nil
1688 }
1689
1690 // TODO: support WHO masks
1691 entity := msg.Params[0]
1692 entityCM := casemapASCII(entity)
1693
1694 if dc.network == nil && entityCM == dc.nickCM {
1695 // TODO: support AWAY (H/G) in self WHO reply
1696 dc.SendMessage(&irc.Message{
1697 Prefix: dc.srv.prefix(),
1698 Command: irc.RPL_WHOREPLY,
1699 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1700 })
1701 dc.SendMessage(&irc.Message{
1702 Prefix: dc.srv.prefix(),
1703 Command: irc.RPL_ENDOFWHO,
1704 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1705 })
1706 return nil
1707 }
1708 if entityCM == serviceNickCM {
1709 dc.SendMessage(&irc.Message{
1710 Prefix: dc.srv.prefix(),
1711 Command: irc.RPL_WHOREPLY,
1712 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1713 })
1714 dc.SendMessage(&irc.Message{
1715 Prefix: dc.srv.prefix(),
1716 Command: irc.RPL_ENDOFWHO,
1717 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1718 })
1719 return nil
1720 }
1721
1722 uc, upstreamName, err := dc.unmarshalEntity(entity)
1723 if err != nil {
1724 return err
1725 }
1726
1727 var params []string
1728 if len(msg.Params) == 2 {
1729 params = []string{upstreamName, msg.Params[1]}
1730 } else {
1731 params = []string{upstreamName}
1732 }
1733
1734 uc.SendMessageLabeled(dc.id, &irc.Message{
1735 Command: "WHO",
1736 Params: params,
1737 })
1738 case "WHOIS":
1739 if len(msg.Params) == 0 {
1740 return ircError{&irc.Message{
1741 Command: irc.ERR_NONICKNAMEGIVEN,
1742 Params: []string{dc.nick, "No nickname given"},
1743 }}
1744 }
1745
1746 var target, mask string
1747 if len(msg.Params) == 1 {
1748 target = ""
1749 mask = msg.Params[0]
1750 } else {
1751 target = msg.Params[0]
1752 mask = msg.Params[1]
1753 }
1754 // TODO: support multiple WHOIS users
1755 if i := strings.IndexByte(mask, ','); i >= 0 {
1756 mask = mask[:i]
1757 }
1758
1759 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1760 dc.SendMessage(&irc.Message{
1761 Prefix: dc.srv.prefix(),
1762 Command: irc.RPL_WHOISUSER,
1763 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1764 })
1765 dc.SendMessage(&irc.Message{
1766 Prefix: dc.srv.prefix(),
1767 Command: irc.RPL_WHOISSERVER,
1768 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1769 })
1770 dc.SendMessage(&irc.Message{
1771 Prefix: dc.srv.prefix(),
1772 Command: irc.RPL_ENDOFWHOIS,
1773 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1774 })
1775 return nil
1776 }
1777
1778 // TODO: support WHOIS masks
1779 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1780 if err != nil {
1781 return err
1782 }
1783
1784 var params []string
1785 if target != "" {
1786 if target == mask { // WHOIS nick nick
1787 params = []string{upstreamNick, upstreamNick}
1788 } else {
1789 params = []string{target, upstreamNick}
1790 }
1791 } else {
1792 params = []string{upstreamNick}
1793 }
1794
1795 uc.SendMessageLabeled(dc.id, &irc.Message{
1796 Command: "WHOIS",
1797 Params: params,
1798 })
1799 case "PRIVMSG":
1800 var targetsStr, text string
1801 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1802 return err
1803 }
1804 tags := copyClientTags(msg.Tags)
1805
1806 for _, name := range strings.Split(targetsStr, ",") {
1807 if dc.network == nil && casemapASCII(name) == dc.nickCM {
1808 dc.SendMessage(msg)
1809 continue
1810 }
1811
1812 if casemapASCII(name) == serviceNickCM {
1813 if dc.caps["echo-message"] {
1814 echoTags := tags.Copy()
1815 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1816 dc.SendMessage(&irc.Message{
1817 Tags: echoTags,
1818 Prefix: dc.prefix(),
1819 Command: "PRIVMSG",
1820 Params: []string{name, text},
1821 })
1822 }
1823 handleServicePRIVMSG(dc, text)
1824 continue
1825 }
1826
1827 uc, upstreamName, err := dc.unmarshalEntity(name)
1828 if err != nil {
1829 return err
1830 }
1831
1832 if uc.network.casemap(upstreamName) == "nickserv" {
1833 dc.handleNickServPRIVMSG(uc, text)
1834 }
1835
1836 unmarshaledText := text
1837 if uc.isChannel(upstreamName) {
1838 unmarshaledText = dc.unmarshalText(uc, text)
1839 }
1840 uc.SendMessageLabeled(dc.id, &irc.Message{
1841 Tags: tags,
1842 Command: "PRIVMSG",
1843 Params: []string{upstreamName, unmarshaledText},
1844 })
1845
1846 echoTags := tags.Copy()
1847 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1848 echoMsg := &irc.Message{
1849 Tags: echoTags,
1850 Prefix: &irc.Prefix{
1851 Name: uc.nick,
1852 User: uc.username,
1853 },
1854 Command: "PRIVMSG",
1855 Params: []string{upstreamName, text},
1856 }
1857 uc.produce(upstreamName, echoMsg, dc)
1858
1859 uc.updateChannelAutoDetach(upstreamName)
1860 }
1861 case "NOTICE":
1862 var targetsStr, text string
1863 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1864 return err
1865 }
1866 tags := copyClientTags(msg.Tags)
1867
1868 for _, name := range strings.Split(targetsStr, ",") {
1869 uc, upstreamName, err := dc.unmarshalEntity(name)
1870 if err != nil {
1871 return err
1872 }
1873
1874 unmarshaledText := text
1875 if uc.isChannel(upstreamName) {
1876 unmarshaledText = dc.unmarshalText(uc, text)
1877 }
1878 uc.SendMessageLabeled(dc.id, &irc.Message{
1879 Tags: tags,
1880 Command: "NOTICE",
1881 Params: []string{upstreamName, unmarshaledText},
1882 })
1883
1884 uc.updateChannelAutoDetach(upstreamName)
1885 }
1886 case "TAGMSG":
1887 var targetsStr string
1888 if err := parseMessageParams(msg, &targetsStr); err != nil {
1889 return err
1890 }
1891 tags := copyClientTags(msg.Tags)
1892
1893 for _, name := range strings.Split(targetsStr, ",") {
1894 uc, upstreamName, err := dc.unmarshalEntity(name)
1895 if err != nil {
1896 return err
1897 }
1898 if _, ok := uc.caps["message-tags"]; !ok {
1899 continue
1900 }
1901
1902 uc.SendMessageLabeled(dc.id, &irc.Message{
1903 Tags: tags,
1904 Command: "TAGMSG",
1905 Params: []string{upstreamName},
1906 })
1907
1908 uc.updateChannelAutoDetach(upstreamName)
1909 }
1910 case "INVITE":
1911 var user, channel string
1912 if err := parseMessageParams(msg, &user, &channel); err != nil {
1913 return err
1914 }
1915
1916 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1917 if err != nil {
1918 return err
1919 }
1920
1921 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1922 if err != nil {
1923 return err
1924 }
1925
1926 if ucChannel != ucUser {
1927 return ircError{&irc.Message{
1928 Command: irc.ERR_USERNOTINCHANNEL,
1929 Params: []string{dc.nick, user, channel, "They are on another network"},
1930 }}
1931 }
1932 uc := ucChannel
1933
1934 uc.SendMessageLabeled(dc.id, &irc.Message{
1935 Command: "INVITE",
1936 Params: []string{upstreamUser, upstreamChannel},
1937 })
1938 case "CHATHISTORY":
1939 var subcommand string
1940 if err := parseMessageParams(msg, &subcommand); err != nil {
1941 return err
1942 }
1943 var target, limitStr string
1944 var boundsStr [2]string
1945 switch subcommand {
1946 case "AFTER", "BEFORE":
1947 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
1948 return err
1949 }
1950 case "BETWEEN":
1951 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
1952 return err
1953 }
1954 default:
1955 // TODO: support LATEST, AROUND
1956 return ircError{&irc.Message{
1957 Command: "FAIL",
1958 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
1959 }}
1960 }
1961
1962 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1963 if !ok {
1964 return ircError{&irc.Message{
1965 Command: irc.ERR_UNKNOWNCOMMAND,
1966 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
1967 }}
1968 }
1969
1970 uc, entity, err := dc.unmarshalEntity(target)
1971 if err != nil {
1972 return err
1973 }
1974 entity = uc.network.casemap(entity)
1975
1976 // TODO: support msgid criteria
1977 var bounds [2]time.Time
1978 bounds[0] = parseChatHistoryBound(boundsStr[0])
1979 if bounds[0].IsZero() {
1980 return ircError{&irc.Message{
1981 Command: "FAIL",
1982 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
1983 }}
1984 }
1985
1986 if boundsStr[1] != "" {
1987 bounds[1] = parseChatHistoryBound(boundsStr[1])
1988 if bounds[1].IsZero() {
1989 return ircError{&irc.Message{
1990 Command: "FAIL",
1991 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
1992 }}
1993 }
1994 }
1995
1996 limit, err := strconv.Atoi(limitStr)
1997 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1998 return ircError{&irc.Message{
1999 Command: "FAIL",
2000 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2001 }}
2002 }
2003
2004 var history []*irc.Message
2005 switch subcommand {
2006 case "BEFORE":
2007 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], time.Time{}, limit)
2008 case "AFTER":
2009 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], time.Now(), limit)
2010 case "BETWEEN":
2011 if bounds[0].Before(bounds[1]) {
2012 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], bounds[1], limit)
2013 } else {
2014 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], bounds[1], limit)
2015 }
2016 }
2017 if err != nil {
2018 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2019 return newChatHistoryError(subcommand, target)
2020 }
2021
2022 batchRef := "history"
2023 dc.SendMessage(&irc.Message{
2024 Prefix: dc.srv.prefix(),
2025 Command: "BATCH",
2026 Params: []string{"+" + batchRef, "chathistory", target},
2027 })
2028
2029 for _, msg := range history {
2030 msg.Tags["batch"] = irc.TagValue(batchRef)
2031 dc.SendMessage(dc.marshalMessage(msg, uc.network))
2032 }
2033
2034 dc.SendMessage(&irc.Message{
2035 Prefix: dc.srv.prefix(),
2036 Command: "BATCH",
2037 Params: []string{"-" + batchRef},
2038 })
2039 case "BOUNCER":
2040 var subcommand string
2041 if err := parseMessageParams(msg, &subcommand); err != nil {
2042 return err
2043 }
2044
2045 switch strings.ToUpper(subcommand) {
2046 case "LISTNETWORKS":
2047 dc.SendMessage(&irc.Message{
2048 Prefix: dc.srv.prefix(),
2049 Command: "BATCH",
2050 Params: []string{"+networks", "bouncer-networks"},
2051 })
2052 dc.user.forEachNetwork(func(network *network) {
2053 idStr := fmt.Sprintf("%v", network.ID)
2054 attrs := getNetworkAttrs(network)
2055 dc.SendMessage(&irc.Message{
2056 Tags: irc.Tags{"batch": irc.TagValue("networks")},
2057 Prefix: dc.srv.prefix(),
2058 Command: "BOUNCER",
2059 Params: []string{"NETWORK", idStr, attrs.String()},
2060 })
2061 })
2062 dc.SendMessage(&irc.Message{
2063 Prefix: dc.srv.prefix(),
2064 Command: "BATCH",
2065 Params: []string{"-networks"},
2066 })
2067 case "ADDNETWORK":
2068 var attrsStr string
2069 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2070 return err
2071 }
2072 attrs := irc.ParseTags(attrsStr)
2073
2074 host, ok := attrs.GetTag("host")
2075 if !ok {
2076 return ircError{&irc.Message{
2077 Command: "FAIL",
2078 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
2079 }}
2080 }
2081
2082 addr := host
2083 if port, ok := attrs.GetTag("port"); ok {
2084 addr += ":" + port
2085 }
2086
2087 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
2088 addr = "irc+insecure://" + tlsStr
2089 }
2090
2091 nick, ok := attrs.GetTag("nickname")
2092 if !ok {
2093 nick = dc.nick
2094 }
2095
2096 username, _ := attrs.GetTag("username")
2097 realname, _ := attrs.GetTag("realname")
2098 pass, _ := attrs.GetTag("pass")
2099
2100 // TODO: reject unknown attributes
2101
2102 record := &Network{
2103 Addr: addr,
2104 Nick: nick,
2105 Username: username,
2106 Realname: realname,
2107 Pass: pass,
2108 }
2109 network, err := dc.user.createNetwork(record)
2110 if err != nil {
2111 return ircError{&irc.Message{
2112 Command: "FAIL",
2113 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2114 }}
2115 }
2116
2117 dc.SendMessage(&irc.Message{
2118 Prefix: dc.srv.prefix(),
2119 Command: "BOUNCER",
2120 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2121 })
2122 case "CHANGENETWORK":
2123 var idStr, attrsStr string
2124 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2125 return err
2126 }
2127 id, err := parseBouncerNetID(subcommand, idStr)
2128 if err != nil {
2129 return err
2130 }
2131 attrs := irc.ParseTags(attrsStr)
2132
2133 net := dc.user.getNetworkByID(id)
2134 if net == nil {
2135 return ircError{&irc.Message{
2136 Command: "FAIL",
2137 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2138 }}
2139 }
2140
2141 record := net.Network // copy network record because we'll mutate it
2142 for k, v := range attrs {
2143 s := string(v)
2144 switch k {
2145 // TODO: host, port, tls
2146 case "nickname":
2147 record.Nick = s
2148 case "username":
2149 record.Username = s
2150 case "realname":
2151 record.Realname = s
2152 case "pass":
2153 record.Pass = s
2154 default:
2155 return ircError{&irc.Message{
2156 Command: "FAIL",
2157 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
2158 }}
2159 }
2160 }
2161
2162 _, err = dc.user.updateNetwork(&record)
2163 if err != nil {
2164 return ircError{&irc.Message{
2165 Command: "FAIL",
2166 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2167 }}
2168 }
2169
2170 dc.SendMessage(&irc.Message{
2171 Prefix: dc.srv.prefix(),
2172 Command: "BOUNCER",
2173 Params: []string{"CHANGENETWORK", idStr},
2174 })
2175 case "DELNETWORK":
2176 var idStr string
2177 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2178 return err
2179 }
2180 id, err := parseBouncerNetID(subcommand, idStr)
2181 if err != nil {
2182 return err
2183 }
2184
2185 net := dc.user.getNetworkByID(id)
2186 if net == nil {
2187 return ircError{&irc.Message{
2188 Command: "FAIL",
2189 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2190 }}
2191 }
2192
2193 if err := dc.user.deleteNetwork(net.ID); err != nil {
2194 return err
2195 }
2196
2197 dc.SendMessage(&irc.Message{
2198 Prefix: dc.srv.prefix(),
2199 Command: "BOUNCER",
2200 Params: []string{"DELNETWORK", idStr},
2201 })
2202 default:
2203 return ircError{&irc.Message{
2204 Command: "FAIL",
2205 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2206 }}
2207 }
2208 default:
2209 dc.logger.Printf("unhandled message: %v", msg)
2210 return newUnknownCommandError(msg.Command)
2211 }
2212 return nil
2213}
2214
2215func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2216 username, password, ok := parseNickServCredentials(text, uc.nick)
2217 if !ok {
2218 return
2219 }
2220
2221 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2222 // automatically erase the key pair or any other credentials.
2223 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2224 return
2225 }
2226
2227 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2228 n := uc.network
2229 n.SASL.Mechanism = "PLAIN"
2230 n.SASL.Plain.Username = username
2231 n.SASL.Plain.Password = password
2232 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
2233 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2234 }
2235}
2236
2237func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2238 fields := strings.Fields(text)
2239 if len(fields) < 2 {
2240 return "", "", false
2241 }
2242 cmd := strings.ToUpper(fields[0])
2243 params := fields[1:]
2244 switch cmd {
2245 case "REGISTER":
2246 username = nick
2247 password = params[0]
2248 case "IDENTIFY":
2249 if len(params) == 1 {
2250 username = nick
2251 password = params[0]
2252 } else {
2253 username = params[0]
2254 password = params[1]
2255 }
2256 case "SET":
2257 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2258 username = nick
2259 password = params[1]
2260 }
2261 default:
2262 return "", "", false
2263 }
2264 return username, password, true
2265}
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