source: code/trunk/upstream.go@ 758

Last change on this file since 758 was 757, checked in by contact, 4 years ago

Add context to {conn,upstreamConn}.SendMessage

This avoids blocking on upstream message rate limiting for too
long.
File size: 55.3 KB
Line 
1package soju
2
3import (
4 "context"
5 "crypto"
6 "crypto/sha256"
7 "crypto/tls"
8 "crypto/x509"
9 "encoding/base64"
10 "errors"
11 "fmt"
12 "io"
13 "net"
14 "strconv"
15 "strings"
16 "time"
17
18 "github.com/emersion/go-sasl"
19 "gopkg.in/irc.v3"
20)
21
22// permanentUpstreamCaps is the static list of upstream capabilities always
23// requested when supported.
24var permanentUpstreamCaps = map[string]bool{
25 "account-notify": true,
26 "account-tag": true,
27 "away-notify": true,
28 "batch": true,
29 "extended-join": true,
30 "invite-notify": true,
31 "labeled-response": true,
32 "message-tags": true,
33 "multi-prefix": true,
34 "sasl": true,
35 "server-time": true,
36 "setname": true,
37
38 "draft/account-registration": true,
39 "draft/extended-monitor": true,
40}
41
42type registrationError struct {
43 *irc.Message
44}
45
46func (err registrationError) Error() string {
47 return fmt.Sprintf("registration error (%v): %v", err.Command, err.Reason())
48}
49
50func (err registrationError) Reason() string {
51 if len(err.Params) > 0 {
52 return err.Params[len(err.Params)-1]
53 }
54 return err.Command
55}
56
57func (err registrationError) Temporary() bool {
58 // Only return false if we're 100% sure that fixing the error requires a
59 // network configuration change
60 switch err.Command {
61 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME:
62 return false
63 case "FAIL":
64 return err.Params[1] != "ACCOUNT_REQUIRED"
65 default:
66 return true
67 }
68}
69
70type upstreamChannel struct {
71 Name string
72 conn *upstreamConn
73 Topic string
74 TopicWho *irc.Prefix
75 TopicTime time.Time
76 Status channelStatus
77 modes channelModes
78 creationTime string
79 Members membershipsCasemapMap
80 complete bool
81 detachTimer *time.Timer
82}
83
84func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
85 if uc.detachTimer != nil {
86 uc.detachTimer.Stop()
87 uc.detachTimer = nil
88 }
89
90 if dur == 0 {
91 return
92 }
93
94 uc.detachTimer = time.AfterFunc(dur, func() {
95 uc.conn.network.user.events <- eventChannelDetach{
96 uc: uc.conn,
97 name: uc.Name,
98 }
99 })
100}
101
102type pendingUpstreamCommand struct {
103 downstreamID uint64
104 msg *irc.Message
105}
106
107type upstreamConn struct {
108 conn
109
110 network *network
111 user *user
112
113 serverName string
114 availableUserModes string
115 availableChannelModes map[byte]channelModeType
116 availableChannelTypes string
117 availableMemberships []membership
118 isupport map[string]*string
119
120 registered bool
121 nick string
122 nickCM string
123 username string
124 realname string
125 modes userModes
126 channels upstreamChannelCasemapMap
127 supportedCaps map[string]string
128 caps map[string]bool
129 batches map[string]batch
130 away bool
131 account string
132 nextLabelID uint64
133 monitored monitorCasemapMap
134
135 saslClient sasl.Client
136 saslStarted bool
137
138 casemapIsSet bool
139
140 // Queue of commands in progress, indexed by type. The first entry has been
141 // sent to the server and is awaiting reply. The following entries have not
142 // been sent yet.
143 pendingCmds map[string][]pendingUpstreamCommand
144
145 gotMotd bool
146}
147
148func connectToUpstream(ctx context.Context, network *network) (*upstreamConn, error) {
149 logger := &prefixLogger{network.user.logger, fmt.Sprintf("upstream %q: ", network.GetName())}
150
151 dialer := net.Dialer{Timeout: connectTimeout}
152
153 u, err := network.URL()
154 if err != nil {
155 return nil, err
156 }
157
158 var netConn net.Conn
159 switch u.Scheme {
160 case "ircs":
161 addr := u.Host
162 host, _, err := net.SplitHostPort(u.Host)
163 if err != nil {
164 host = u.Host
165 addr = u.Host + ":6697"
166 }
167
168 dialer.LocalAddr, err = network.user.localTCPAddrForHost(ctx, host)
169 if err != nil {
170 return nil, fmt.Errorf("failed to pick local IP for remote host %q: %v", host, err)
171 }
172
173 logger.Printf("connecting to TLS server at address %q", addr)
174
175 tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
176 if network.SASL.Mechanism == "EXTERNAL" {
177 if network.SASL.External.CertBlob == nil {
178 return nil, fmt.Errorf("missing certificate for authentication")
179 }
180 if network.SASL.External.PrivKeyBlob == nil {
181 return nil, fmt.Errorf("missing private key for authentication")
182 }
183 key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
184 if err != nil {
185 return nil, fmt.Errorf("failed to parse private key: %v", err)
186 }
187 tlsConfig.Certificates = []tls.Certificate{
188 {
189 Certificate: [][]byte{network.SASL.External.CertBlob},
190 PrivateKey: key.(crypto.PrivateKey),
191 },
192 }
193 logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
194 }
195
196 netConn, err = dialer.DialContext(ctx, "tcp", addr)
197 if err != nil {
198 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
199 }
200
201 // Don't do the TLS handshake immediately, because we need to register
202 // the new connection with identd ASAP. See:
203 // https://todo.sr.ht/~emersion/soju/69#event-41859
204 netConn = tls.Client(netConn, tlsConfig)
205 case "irc+insecure":
206 addr := u.Host
207 host, _, err := net.SplitHostPort(addr)
208 if err != nil {
209 host = u.Host
210 addr = u.Host + ":6667"
211 }
212
213 dialer.LocalAddr, err = network.user.localTCPAddrForHost(ctx, host)
214 if err != nil {
215 return nil, fmt.Errorf("failed to pick local IP for remote host %q: %v", host, err)
216 }
217
218 logger.Printf("connecting to plain-text server at address %q", addr)
219 netConn, err = dialer.DialContext(ctx, "tcp", addr)
220 if err != nil {
221 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
222 }
223 case "irc+unix", "unix":
224 logger.Printf("connecting to Unix socket at path %q", u.Path)
225 netConn, err = dialer.DialContext(ctx, "unix", u.Path)
226 if err != nil {
227 return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
228 }
229 default:
230 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
231 }
232
233 options := connOptions{
234 Logger: logger,
235 RateLimitDelay: upstreamMessageDelay,
236 RateLimitBurst: upstreamMessageBurst,
237 }
238
239 uc := &upstreamConn{
240 conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
241 network: network,
242 user: network.user,
243 channels: upstreamChannelCasemapMap{newCasemapMap(0)},
244 supportedCaps: make(map[string]string),
245 caps: make(map[string]bool),
246 batches: make(map[string]batch),
247 availableChannelTypes: stdChannelTypes,
248 availableChannelModes: stdChannelModes,
249 availableMemberships: stdMemberships,
250 isupport: make(map[string]*string),
251 pendingCmds: make(map[string][]pendingUpstreamCommand),
252 monitored: monitorCasemapMap{newCasemapMap(0)},
253 }
254 return uc, nil
255}
256
257func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
258 uc.network.forEachDownstream(f)
259}
260
261func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
262 uc.forEachDownstream(func(dc *downstreamConn) {
263 if id != 0 && id != dc.id {
264 return
265 }
266 f(dc)
267 })
268}
269
270func (uc *upstreamConn) downstreamByID(id uint64) *downstreamConn {
271 for _, dc := range uc.user.downstreamConns {
272 if dc.id == id {
273 return dc
274 }
275 }
276 return nil
277}
278
279func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
280 ch := uc.channels.Value(name)
281 if ch == nil {
282 return nil, fmt.Errorf("unknown channel %q", name)
283 }
284 return ch, nil
285}
286
287func (uc *upstreamConn) isChannel(entity string) bool {
288 return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
289}
290
291func (uc *upstreamConn) isOurNick(nick string) bool {
292 return uc.nickCM == uc.network.casemap(nick)
293}
294
295func (uc *upstreamConn) abortPendingCommands() {
296 for _, l := range uc.pendingCmds {
297 for _, pendingCmd := range l {
298 dc := uc.downstreamByID(pendingCmd.downstreamID)
299 if dc == nil {
300 continue
301 }
302
303 switch pendingCmd.msg.Command {
304 case "LIST":
305 dc.SendMessage(&irc.Message{
306 Prefix: dc.srv.prefix(),
307 Command: irc.RPL_LISTEND,
308 Params: []string{dc.nick, "Command aborted"},
309 })
310 case "WHO":
311 mask := "*"
312 if len(pendingCmd.msg.Params) > 0 {
313 mask = pendingCmd.msg.Params[0]
314 }
315 dc.SendMessage(&irc.Message{
316 Prefix: dc.srv.prefix(),
317 Command: irc.RPL_ENDOFWHO,
318 Params: []string{dc.nick, mask, "Command aborted"},
319 })
320 case "AUTHENTICATE":
321 dc.endSASL(&irc.Message{
322 Prefix: dc.srv.prefix(),
323 Command: irc.ERR_SASLABORTED,
324 Params: []string{dc.nick, "SASL authentication aborted"},
325 })
326 case "REGISTER", "VERIFY":
327 dc.SendMessage(&irc.Message{
328 Prefix: dc.srv.prefix(),
329 Command: "FAIL",
330 Params: []string{pendingCmd.msg.Command, "TEMPORARILY_UNAVAILABLE", pendingCmd.msg.Params[0], "Command aborted"},
331 })
332 default:
333 panic(fmt.Errorf("Unsupported pending command %q", pendingCmd.msg.Command))
334 }
335 }
336 }
337
338 uc.pendingCmds = make(map[string][]pendingUpstreamCommand)
339}
340
341func (uc *upstreamConn) sendNextPendingCommand(cmd string) {
342 if len(uc.pendingCmds[cmd]) == 0 {
343 return
344 }
345 uc.SendMessage(context.TODO(), uc.pendingCmds[cmd][0].msg)
346}
347
348func (uc *upstreamConn) enqueueCommand(dc *downstreamConn, msg *irc.Message) {
349 switch msg.Command {
350 case "LIST", "WHO", "AUTHENTICATE", "REGISTER", "VERIFY":
351 // Supported
352 default:
353 panic(fmt.Errorf("Unsupported pending command %q", msg.Command))
354 }
355
356 uc.pendingCmds[msg.Command] = append(uc.pendingCmds[msg.Command], pendingUpstreamCommand{
357 downstreamID: dc.id,
358 msg: msg,
359 })
360
361 if len(uc.pendingCmds[msg.Command]) == 1 {
362 uc.sendNextPendingCommand(msg.Command)
363 }
364}
365
366func (uc *upstreamConn) currentPendingCommand(cmd string) (*downstreamConn, *irc.Message) {
367 if len(uc.pendingCmds[cmd]) == 0 {
368 return nil, nil
369 }
370
371 pendingCmd := uc.pendingCmds[cmd][0]
372 return uc.downstreamByID(pendingCmd.downstreamID), pendingCmd.msg
373}
374
375func (uc *upstreamConn) dequeueCommand(cmd string) (*downstreamConn, *irc.Message) {
376 dc, msg := uc.currentPendingCommand(cmd)
377
378 if len(uc.pendingCmds[cmd]) > 0 {
379 copy(uc.pendingCmds[cmd], uc.pendingCmds[cmd][1:])
380 uc.pendingCmds[cmd] = uc.pendingCmds[cmd][:len(uc.pendingCmds[cmd])-1]
381 }
382
383 uc.sendNextPendingCommand(cmd)
384
385 return dc, msg
386}
387
388func (uc *upstreamConn) cancelPendingCommandsByDownstreamID(downstreamID uint64) {
389 for cmd := range uc.pendingCmds {
390 // We can't cancel the currently running command stored in
391 // uc.pendingCmds[cmd][0]
392 for i := len(uc.pendingCmds[cmd]) - 1; i >= 1; i-- {
393 if uc.pendingCmds[cmd][i].downstreamID == downstreamID {
394 uc.pendingCmds[cmd] = append(uc.pendingCmds[cmd][:i], uc.pendingCmds[cmd][i+1:]...)
395 }
396 }
397 }
398}
399
400func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
401 memberships := make(memberships, 0, 4)
402 i := 0
403 for _, m := range uc.availableMemberships {
404 if i >= len(s) {
405 break
406 }
407 if s[i] == m.Prefix {
408 memberships = append(memberships, m)
409 i++
410 }
411 }
412 return &memberships, s[i:]
413}
414
415func (uc *upstreamConn) handleMessage(ctx context.Context, msg *irc.Message) error {
416 var label string
417 if l, ok := msg.GetTag("label"); ok {
418 label = l
419 delete(msg.Tags, "label")
420 }
421
422 var msgBatch *batch
423 if batchName, ok := msg.GetTag("batch"); ok {
424 b, ok := uc.batches[batchName]
425 if !ok {
426 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
427 }
428 msgBatch = &b
429 if label == "" {
430 label = msgBatch.Label
431 }
432 delete(msg.Tags, "batch")
433 }
434
435 var downstreamID uint64 = 0
436 if label != "" {
437 var labelOffset uint64
438 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
439 if err == nil && n < 2 {
440 err = errors.New("not enough arguments")
441 }
442 if err != nil {
443 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
444 }
445 }
446
447 if _, ok := msg.Tags["time"]; !ok {
448 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
449 }
450
451 switch msg.Command {
452 case "PING":
453 uc.SendMessage(ctx, &irc.Message{
454 Command: "PONG",
455 Params: msg.Params,
456 })
457 return nil
458 case "NOTICE", "PRIVMSG", "TAGMSG":
459 if msg.Prefix == nil {
460 return fmt.Errorf("expected a prefix")
461 }
462
463 var entity, text string
464 if msg.Command != "TAGMSG" {
465 if err := parseMessageParams(msg, &entity, &text); err != nil {
466 return err
467 }
468 } else {
469 if err := parseMessageParams(msg, &entity); err != nil {
470 return err
471 }
472 }
473
474 if msg.Prefix.Name == serviceNick {
475 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
476 break
477 }
478 if entity == serviceNick {
479 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
480 break
481 }
482
483 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
484 uc.produce("", msg, nil)
485 } else { // regular user message
486 target := entity
487 if uc.isOurNick(target) {
488 target = msg.Prefix.Name
489 }
490
491 ch := uc.network.channels.Value(target)
492 if ch != nil && msg.Command != "TAGMSG" {
493 if ch.Detached {
494 uc.handleDetachedMessage(ctx, ch, msg)
495 }
496
497 highlight := uc.network.isHighlight(msg)
498 if ch.DetachOn == FilterMessage || ch.DetachOn == FilterDefault || (ch.DetachOn == FilterHighlight && highlight) {
499 uc.updateChannelAutoDetach(target)
500 }
501 }
502
503 uc.produce(target, msg, nil)
504 }
505 case "CAP":
506 var subCmd string
507 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
508 return err
509 }
510 subCmd = strings.ToUpper(subCmd)
511 subParams := msg.Params[2:]
512 switch subCmd {
513 case "LS":
514 if len(subParams) < 1 {
515 return newNeedMoreParamsError(msg.Command)
516 }
517 caps := subParams[len(subParams)-1]
518 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
519
520 uc.handleSupportedCaps(caps)
521
522 if more {
523 break // wait to receive all capabilities
524 }
525
526 uc.requestCaps()
527
528 if uc.requestSASL() {
529 break // we'll send CAP END after authentication is completed
530 }
531
532 uc.SendMessage(ctx, &irc.Message{
533 Command: "CAP",
534 Params: []string{"END"},
535 })
536 case "ACK", "NAK":
537 if len(subParams) < 1 {
538 return newNeedMoreParamsError(msg.Command)
539 }
540 caps := strings.Fields(subParams[0])
541
542 for _, name := range caps {
543 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
544 return err
545 }
546 }
547
548 if uc.registered {
549 uc.forEachDownstream(func(dc *downstreamConn) {
550 dc.updateSupportedCaps()
551 })
552 }
553 case "NEW":
554 if len(subParams) < 1 {
555 return newNeedMoreParamsError(msg.Command)
556 }
557 uc.handleSupportedCaps(subParams[0])
558 uc.requestCaps()
559 case "DEL":
560 if len(subParams) < 1 {
561 return newNeedMoreParamsError(msg.Command)
562 }
563 caps := strings.Fields(subParams[0])
564
565 for _, c := range caps {
566 delete(uc.supportedCaps, c)
567 delete(uc.caps, c)
568 }
569
570 if uc.registered {
571 uc.forEachDownstream(func(dc *downstreamConn) {
572 dc.updateSupportedCaps()
573 })
574 }
575 default:
576 uc.logger.Printf("unhandled message: %v", msg)
577 }
578 case "AUTHENTICATE":
579 if uc.saslClient == nil {
580 return fmt.Errorf("received unexpected AUTHENTICATE message")
581 }
582
583 // TODO: if a challenge is 400 bytes long, buffer it
584 var challengeStr string
585 if err := parseMessageParams(msg, &challengeStr); err != nil {
586 uc.SendMessage(ctx, &irc.Message{
587 Command: "AUTHENTICATE",
588 Params: []string{"*"},
589 })
590 return err
591 }
592
593 var challenge []byte
594 if challengeStr != "+" {
595 var err error
596 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
597 if err != nil {
598 uc.SendMessage(ctx, &irc.Message{
599 Command: "AUTHENTICATE",
600 Params: []string{"*"},
601 })
602 return err
603 }
604 }
605
606 var resp []byte
607 var err error
608 if !uc.saslStarted {
609 _, resp, err = uc.saslClient.Start()
610 uc.saslStarted = true
611 } else {
612 resp, err = uc.saslClient.Next(challenge)
613 }
614 if err != nil {
615 uc.SendMessage(ctx, &irc.Message{
616 Command: "AUTHENTICATE",
617 Params: []string{"*"},
618 })
619 return err
620 }
621
622 // TODO: send response in multiple chunks if >= 400 bytes
623 var respStr = "+"
624 if len(resp) != 0 {
625 respStr = base64.StdEncoding.EncodeToString(resp)
626 }
627
628 uc.SendMessage(ctx, &irc.Message{
629 Command: "AUTHENTICATE",
630 Params: []string{respStr},
631 })
632 case irc.RPL_LOGGEDIN:
633 if err := parseMessageParams(msg, nil, nil, &uc.account); err != nil {
634 return err
635 }
636 uc.logger.Printf("logged in with account %q", uc.account)
637 uc.forEachDownstream(func(dc *downstreamConn) {
638 dc.updateAccount()
639 })
640 case irc.RPL_LOGGEDOUT:
641 uc.account = ""
642 uc.logger.Printf("logged out")
643 uc.forEachDownstream(func(dc *downstreamConn) {
644 dc.updateAccount()
645 })
646 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
647 var info string
648 if err := parseMessageParams(msg, nil, &info); err != nil {
649 return err
650 }
651 switch msg.Command {
652 case irc.ERR_NICKLOCKED:
653 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
654 case irc.ERR_SASLFAIL:
655 uc.logger.Printf("SASL authentication failed: %v", info)
656 case irc.ERR_SASLTOOLONG:
657 uc.logger.Printf("SASL message too long: %v", info)
658 }
659
660 uc.saslClient = nil
661 uc.saslStarted = false
662
663 if dc, _ := uc.dequeueCommand("AUTHENTICATE"); dc != nil && dc.sasl != nil {
664 if msg.Command == irc.RPL_SASLSUCCESS {
665 uc.network.autoSaveSASLPlain(ctx, dc.sasl.plainUsername, dc.sasl.plainPassword)
666 }
667
668 dc.endSASL(msg)
669 }
670
671 if !uc.registered {
672 uc.SendMessage(ctx, &irc.Message{
673 Command: "CAP",
674 Params: []string{"END"},
675 })
676 }
677 case "REGISTER", "VERIFY":
678 if dc, cmd := uc.dequeueCommand(msg.Command); dc != nil {
679 if msg.Command == "REGISTER" {
680 var account, password string
681 if err := parseMessageParams(msg, nil, &account); err != nil {
682 return err
683 }
684 if err := parseMessageParams(cmd, nil, nil, &password); err != nil {
685 return err
686 }
687 uc.network.autoSaveSASLPlain(ctx, account, password)
688 }
689
690 dc.SendMessage(msg)
691 }
692 case irc.RPL_WELCOME:
693 if err := parseMessageParams(msg, &uc.nick); err != nil {
694 return err
695 }
696
697 uc.registered = true
698 uc.nickCM = uc.network.casemap(uc.nick)
699 uc.logger.Printf("connection registered with nick %q", uc.nick)
700
701 if uc.network.channels.Len() > 0 {
702 var channels, keys []string
703 for _, entry := range uc.network.channels.innerMap {
704 ch := entry.value.(*Channel)
705 channels = append(channels, ch.Name)
706 keys = append(keys, ch.Key)
707 }
708
709 for _, msg := range join(channels, keys) {
710 uc.SendMessage(ctx, msg)
711 }
712 }
713 case irc.RPL_MYINFO:
714 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
715 return err
716 }
717 case irc.RPL_ISUPPORT:
718 if err := parseMessageParams(msg, nil, nil); err != nil {
719 return err
720 }
721
722 var downstreamIsupport []string
723 for _, token := range msg.Params[1 : len(msg.Params)-1] {
724 parameter := token
725 var negate, hasValue bool
726 var value string
727 if strings.HasPrefix(token, "-") {
728 negate = true
729 token = token[1:]
730 } else if i := strings.IndexByte(token, '='); i >= 0 {
731 parameter = token[:i]
732 value = token[i+1:]
733 hasValue = true
734 }
735
736 if hasValue {
737 uc.isupport[parameter] = &value
738 } else if !negate {
739 uc.isupport[parameter] = nil
740 } else {
741 delete(uc.isupport, parameter)
742 }
743
744 var err error
745 switch parameter {
746 case "CASEMAPPING":
747 casemap, ok := parseCasemappingToken(value)
748 if !ok {
749 casemap = casemapRFC1459
750 }
751 uc.network.updateCasemapping(casemap)
752 uc.nickCM = uc.network.casemap(uc.nick)
753 uc.casemapIsSet = true
754 case "CHANMODES":
755 if !negate {
756 err = uc.handleChanModes(value)
757 } else {
758 uc.availableChannelModes = stdChannelModes
759 }
760 case "CHANTYPES":
761 if !negate {
762 uc.availableChannelTypes = value
763 } else {
764 uc.availableChannelTypes = stdChannelTypes
765 }
766 case "PREFIX":
767 if !negate {
768 err = uc.handleMemberships(value)
769 } else {
770 uc.availableMemberships = stdMemberships
771 }
772 }
773 if err != nil {
774 return err
775 }
776
777 if passthroughIsupport[parameter] {
778 downstreamIsupport = append(downstreamIsupport, token)
779 }
780 }
781
782 uc.updateMonitor()
783
784 uc.forEachDownstream(func(dc *downstreamConn) {
785 if dc.network == nil {
786 return
787 }
788 msgs := generateIsupport(dc.srv.prefix(), dc.nick, downstreamIsupport)
789 for _, msg := range msgs {
790 dc.SendMessage(msg)
791 }
792 })
793 case irc.ERR_NOMOTD, irc.RPL_ENDOFMOTD:
794 if !uc.casemapIsSet {
795 // upstream did not send any CASEMAPPING token, thus
796 // we assume it implements the old RFCs with rfc1459.
797 uc.casemapIsSet = true
798 uc.network.updateCasemapping(casemapRFC1459)
799 uc.nickCM = uc.network.casemap(uc.nick)
800 }
801
802 if !uc.gotMotd {
803 // Ignore the initial MOTD upon connection, but forward
804 // subsequent MOTD messages downstream
805 uc.gotMotd = true
806 return nil
807 }
808
809 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
810 dc.SendMessage(&irc.Message{
811 Prefix: uc.srv.prefix(),
812 Command: msg.Command,
813 Params: msg.Params,
814 })
815 })
816 case "BATCH":
817 var tag string
818 if err := parseMessageParams(msg, &tag); err != nil {
819 return err
820 }
821
822 if strings.HasPrefix(tag, "+") {
823 tag = tag[1:]
824 if _, ok := uc.batches[tag]; ok {
825 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
826 }
827 var batchType string
828 if err := parseMessageParams(msg, nil, &batchType); err != nil {
829 return err
830 }
831 label := label
832 if label == "" && msgBatch != nil {
833 label = msgBatch.Label
834 }
835 uc.batches[tag] = batch{
836 Type: batchType,
837 Params: msg.Params[2:],
838 Outer: msgBatch,
839 Label: label,
840 }
841 } else if strings.HasPrefix(tag, "-") {
842 tag = tag[1:]
843 if _, ok := uc.batches[tag]; !ok {
844 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
845 }
846 delete(uc.batches, tag)
847 } else {
848 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
849 }
850 case "NICK":
851 if msg.Prefix == nil {
852 return fmt.Errorf("expected a prefix")
853 }
854
855 var newNick string
856 if err := parseMessageParams(msg, &newNick); err != nil {
857 return err
858 }
859
860 me := false
861 if uc.isOurNick(msg.Prefix.Name) {
862 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
863 me = true
864 uc.nick = newNick
865 uc.nickCM = uc.network.casemap(uc.nick)
866 }
867
868 for _, entry := range uc.channels.innerMap {
869 ch := entry.value.(*upstreamChannel)
870 memberships := ch.Members.Value(msg.Prefix.Name)
871 if memberships != nil {
872 ch.Members.Delete(msg.Prefix.Name)
873 ch.Members.SetValue(newNick, memberships)
874 uc.appendLog(ch.Name, msg)
875 }
876 }
877
878 if !me {
879 uc.forEachDownstream(func(dc *downstreamConn) {
880 dc.SendMessage(dc.marshalMessage(msg, uc.network))
881 })
882 } else {
883 uc.forEachDownstream(func(dc *downstreamConn) {
884 dc.updateNick()
885 })
886 uc.updateMonitor()
887 }
888 case "SETNAME":
889 if msg.Prefix == nil {
890 return fmt.Errorf("expected a prefix")
891 }
892
893 var newRealname string
894 if err := parseMessageParams(msg, &newRealname); err != nil {
895 return err
896 }
897
898 // TODO: consider appending this message to logs
899
900 if uc.isOurNick(msg.Prefix.Name) {
901 uc.logger.Printf("changed realname from %q to %q", uc.realname, newRealname)
902 uc.realname = newRealname
903
904 uc.forEachDownstream(func(dc *downstreamConn) {
905 dc.updateRealname()
906 })
907 } else {
908 uc.forEachDownstream(func(dc *downstreamConn) {
909 dc.SendMessage(dc.marshalMessage(msg, uc.network))
910 })
911 }
912 case "JOIN":
913 if msg.Prefix == nil {
914 return fmt.Errorf("expected a prefix")
915 }
916
917 var channels string
918 if err := parseMessageParams(msg, &channels); err != nil {
919 return err
920 }
921
922 for _, ch := range strings.Split(channels, ",") {
923 if uc.isOurNick(msg.Prefix.Name) {
924 uc.logger.Printf("joined channel %q", ch)
925 members := membershipsCasemapMap{newCasemapMap(0)}
926 members.casemap = uc.network.casemap
927 uc.channels.SetValue(ch, &upstreamChannel{
928 Name: ch,
929 conn: uc,
930 Members: members,
931 })
932 uc.updateChannelAutoDetach(ch)
933
934 uc.SendMessage(ctx, &irc.Message{
935 Command: "MODE",
936 Params: []string{ch},
937 })
938 } else {
939 ch, err := uc.getChannel(ch)
940 if err != nil {
941 return err
942 }
943 ch.Members.SetValue(msg.Prefix.Name, &memberships{})
944 }
945
946 chMsg := msg.Copy()
947 chMsg.Params[0] = ch
948 uc.produce(ch, chMsg, nil)
949 }
950 case "PART":
951 if msg.Prefix == nil {
952 return fmt.Errorf("expected a prefix")
953 }
954
955 var channels string
956 if err := parseMessageParams(msg, &channels); err != nil {
957 return err
958 }
959
960 for _, ch := range strings.Split(channels, ",") {
961 if uc.isOurNick(msg.Prefix.Name) {
962 uc.logger.Printf("parted channel %q", ch)
963 uch := uc.channels.Value(ch)
964 if uch != nil {
965 uc.channels.Delete(ch)
966 uch.updateAutoDetach(0)
967 }
968 } else {
969 ch, err := uc.getChannel(ch)
970 if err != nil {
971 return err
972 }
973 ch.Members.Delete(msg.Prefix.Name)
974 }
975
976 chMsg := msg.Copy()
977 chMsg.Params[0] = ch
978 uc.produce(ch, chMsg, nil)
979 }
980 case "KICK":
981 if msg.Prefix == nil {
982 return fmt.Errorf("expected a prefix")
983 }
984
985 var channel, user string
986 if err := parseMessageParams(msg, &channel, &user); err != nil {
987 return err
988 }
989
990 if uc.isOurNick(user) {
991 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
992 uc.channels.Delete(channel)
993 } else {
994 ch, err := uc.getChannel(channel)
995 if err != nil {
996 return err
997 }
998 ch.Members.Delete(user)
999 }
1000
1001 uc.produce(channel, msg, nil)
1002 case "QUIT":
1003 if msg.Prefix == nil {
1004 return fmt.Errorf("expected a prefix")
1005 }
1006
1007 if uc.isOurNick(msg.Prefix.Name) {
1008 uc.logger.Printf("quit")
1009 }
1010
1011 for _, entry := range uc.channels.innerMap {
1012 ch := entry.value.(*upstreamChannel)
1013 if ch.Members.Has(msg.Prefix.Name) {
1014 ch.Members.Delete(msg.Prefix.Name)
1015
1016 uc.appendLog(ch.Name, msg)
1017 }
1018 }
1019
1020 if msg.Prefix.Name != uc.nick {
1021 uc.forEachDownstream(func(dc *downstreamConn) {
1022 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1023 })
1024 }
1025 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
1026 var name, topic string
1027 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
1028 return err
1029 }
1030 ch, err := uc.getChannel(name)
1031 if err != nil {
1032 return err
1033 }
1034 if msg.Command == irc.RPL_TOPIC {
1035 ch.Topic = topic
1036 } else {
1037 ch.Topic = ""
1038 }
1039 case "TOPIC":
1040 if msg.Prefix == nil {
1041 return fmt.Errorf("expected a prefix")
1042 }
1043
1044 var name string
1045 if err := parseMessageParams(msg, &name); err != nil {
1046 return err
1047 }
1048 ch, err := uc.getChannel(name)
1049 if err != nil {
1050 return err
1051 }
1052 if len(msg.Params) > 1 {
1053 ch.Topic = msg.Params[1]
1054 ch.TopicWho = msg.Prefix.Copy()
1055 ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
1056 } else {
1057 ch.Topic = ""
1058 }
1059 uc.produce(ch.Name, msg, nil)
1060 case "MODE":
1061 var name, modeStr string
1062 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
1063 return err
1064 }
1065
1066 if !uc.isChannel(name) { // user mode change
1067 if name != uc.nick {
1068 return fmt.Errorf("received MODE message for unknown nick %q", name)
1069 }
1070
1071 if err := uc.modes.Apply(modeStr); err != nil {
1072 return err
1073 }
1074
1075 uc.forEachDownstream(func(dc *downstreamConn) {
1076 if dc.upstream() == nil {
1077 return
1078 }
1079
1080 dc.SendMessage(msg)
1081 })
1082 } else { // channel mode change
1083 ch, err := uc.getChannel(name)
1084 if err != nil {
1085 return err
1086 }
1087
1088 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
1089 if err != nil {
1090 return err
1091 }
1092
1093 uc.appendLog(ch.Name, msg)
1094
1095 c := uc.network.channels.Value(name)
1096 if c == nil || !c.Detached {
1097 uc.forEachDownstream(func(dc *downstreamConn) {
1098 params := make([]string, len(msg.Params))
1099 params[0] = dc.marshalEntity(uc.network, name)
1100 params[1] = modeStr
1101
1102 copy(params[2:], msg.Params[2:])
1103 for i, modeParam := range params[2:] {
1104 if _, ok := needMarshaling[i]; ok {
1105 params[2+i] = dc.marshalEntity(uc.network, modeParam)
1106 }
1107 }
1108
1109 dc.SendMessage(&irc.Message{
1110 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1111 Command: "MODE",
1112 Params: params,
1113 })
1114 })
1115 }
1116 }
1117 case irc.RPL_UMODEIS:
1118 if err := parseMessageParams(msg, nil); err != nil {
1119 return err
1120 }
1121 modeStr := ""
1122 if len(msg.Params) > 1 {
1123 modeStr = msg.Params[1]
1124 }
1125
1126 uc.modes = ""
1127 if err := uc.modes.Apply(modeStr); err != nil {
1128 return err
1129 }
1130
1131 uc.forEachDownstream(func(dc *downstreamConn) {
1132 if dc.upstream() == nil {
1133 return
1134 }
1135
1136 dc.SendMessage(msg)
1137 })
1138 case irc.RPL_CHANNELMODEIS:
1139 var channel string
1140 if err := parseMessageParams(msg, nil, &channel); err != nil {
1141 return err
1142 }
1143 modeStr := ""
1144 if len(msg.Params) > 2 {
1145 modeStr = msg.Params[2]
1146 }
1147
1148 ch, err := uc.getChannel(channel)
1149 if err != nil {
1150 return err
1151 }
1152
1153 firstMode := ch.modes == nil
1154 ch.modes = make(map[byte]string)
1155 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
1156 return err
1157 }
1158 if firstMode {
1159 c := uc.network.channels.Value(channel)
1160 if c == nil || !c.Detached {
1161 modeStr, modeParams := ch.modes.Format()
1162
1163 uc.forEachDownstream(func(dc *downstreamConn) {
1164 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
1165 params = append(params, modeParams...)
1166
1167 dc.SendMessage(&irc.Message{
1168 Prefix: dc.srv.prefix(),
1169 Command: irc.RPL_CHANNELMODEIS,
1170 Params: params,
1171 })
1172 })
1173 }
1174 }
1175 case rpl_creationtime:
1176 var channel, creationTime string
1177 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
1178 return err
1179 }
1180
1181 ch, err := uc.getChannel(channel)
1182 if err != nil {
1183 return err
1184 }
1185
1186 firstCreationTime := ch.creationTime == ""
1187 ch.creationTime = creationTime
1188 if firstCreationTime {
1189 uc.forEachDownstream(func(dc *downstreamConn) {
1190 dc.SendMessage(&irc.Message{
1191 Prefix: dc.srv.prefix(),
1192 Command: rpl_creationtime,
1193 Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
1194 })
1195 })
1196 }
1197 case rpl_topicwhotime:
1198 var name, who, timeStr string
1199 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
1200 return err
1201 }
1202 ch, err := uc.getChannel(name)
1203 if err != nil {
1204 return err
1205 }
1206 firstTopicWhoTime := ch.TopicWho == nil
1207 ch.TopicWho = irc.ParsePrefix(who)
1208 sec, err := strconv.ParseInt(timeStr, 10, 64)
1209 if err != nil {
1210 return fmt.Errorf("failed to parse topic time: %v", err)
1211 }
1212 ch.TopicTime = time.Unix(sec, 0)
1213 if firstTopicWhoTime {
1214 uc.forEachDownstream(func(dc *downstreamConn) {
1215 topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
1216 dc.SendMessage(&irc.Message{
1217 Prefix: dc.srv.prefix(),
1218 Command: rpl_topicwhotime,
1219 Params: []string{
1220 dc.nick,
1221 dc.marshalEntity(uc.network, ch.Name),
1222 topicWho.String(),
1223 timeStr,
1224 },
1225 })
1226 })
1227 }
1228 case irc.RPL_LIST:
1229 var channel, clients, topic string
1230 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
1231 return err
1232 }
1233
1234 dc, cmd := uc.currentPendingCommand("LIST")
1235 if cmd == nil {
1236 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
1237 } else if dc == nil {
1238 return nil
1239 }
1240
1241 dc.SendMessage(&irc.Message{
1242 Prefix: dc.srv.prefix(),
1243 Command: irc.RPL_LIST,
1244 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
1245 })
1246 case irc.RPL_LISTEND:
1247 dc, cmd := uc.dequeueCommand("LIST")
1248 if cmd == nil {
1249 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
1250 } else if dc == nil {
1251 return nil
1252 }
1253
1254 dc.SendMessage(&irc.Message{
1255 Prefix: dc.srv.prefix(),
1256 Command: irc.RPL_LISTEND,
1257 Params: []string{dc.nick, "End of /LIST"},
1258 })
1259 case irc.RPL_NAMREPLY:
1260 var name, statusStr, members string
1261 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
1262 return err
1263 }
1264
1265 ch := uc.channels.Value(name)
1266 if ch == nil {
1267 // NAMES on a channel we have not joined, forward to downstream
1268 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1269 channel := dc.marshalEntity(uc.network, name)
1270 members := splitSpace(members)
1271 for i, member := range members {
1272 memberships, nick := uc.parseMembershipPrefix(member)
1273 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1274 }
1275 memberStr := strings.Join(members, " ")
1276
1277 dc.SendMessage(&irc.Message{
1278 Prefix: dc.srv.prefix(),
1279 Command: irc.RPL_NAMREPLY,
1280 Params: []string{dc.nick, statusStr, channel, memberStr},
1281 })
1282 })
1283 return nil
1284 }
1285
1286 status, err := parseChannelStatus(statusStr)
1287 if err != nil {
1288 return err
1289 }
1290 ch.Status = status
1291
1292 for _, s := range splitSpace(members) {
1293 memberships, nick := uc.parseMembershipPrefix(s)
1294 ch.Members.SetValue(nick, memberships)
1295 }
1296 case irc.RPL_ENDOFNAMES:
1297 var name string
1298 if err := parseMessageParams(msg, nil, &name); err != nil {
1299 return err
1300 }
1301
1302 ch := uc.channels.Value(name)
1303 if ch == nil {
1304 // NAMES on a channel we have not joined, forward to downstream
1305 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1306 channel := dc.marshalEntity(uc.network, name)
1307
1308 dc.SendMessage(&irc.Message{
1309 Prefix: dc.srv.prefix(),
1310 Command: irc.RPL_ENDOFNAMES,
1311 Params: []string{dc.nick, channel, "End of /NAMES list"},
1312 })
1313 })
1314 return nil
1315 }
1316
1317 if ch.complete {
1318 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1319 }
1320 ch.complete = true
1321
1322 c := uc.network.channels.Value(name)
1323 if c == nil || !c.Detached {
1324 uc.forEachDownstream(func(dc *downstreamConn) {
1325 forwardChannel(dc, ch)
1326 })
1327 }
1328 case irc.RPL_WHOREPLY:
1329 var channel, username, host, server, nick, mode, trailing string
1330 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1331 return err
1332 }
1333
1334 dc, cmd := uc.currentPendingCommand("WHO")
1335 if cmd == nil {
1336 return fmt.Errorf("unexpected RPL_WHOREPLY: no matching pending WHO")
1337 } else if dc == nil {
1338 return nil
1339 }
1340
1341 if channel != "*" {
1342 channel = dc.marshalEntity(uc.network, channel)
1343 }
1344 nick = dc.marshalEntity(uc.network, nick)
1345 dc.SendMessage(&irc.Message{
1346 Prefix: dc.srv.prefix(),
1347 Command: irc.RPL_WHOREPLY,
1348 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1349 })
1350 case rpl_whospcrpl:
1351 dc, cmd := uc.currentPendingCommand("WHO")
1352 if cmd == nil {
1353 return fmt.Errorf("unexpected RPL_WHOSPCRPL: no matching pending WHO")
1354 } else if dc == nil {
1355 return nil
1356 }
1357
1358 // Only supported in single-upstream mode, so forward as-is
1359 dc.SendMessage(msg)
1360 case irc.RPL_ENDOFWHO:
1361 var name string
1362 if err := parseMessageParams(msg, nil, &name); err != nil {
1363 return err
1364 }
1365
1366 dc, cmd := uc.dequeueCommand("WHO")
1367 if cmd == nil {
1368 return fmt.Errorf("unexpected RPL_ENDOFWHO: no matching pending WHO")
1369 } else if dc == nil {
1370 return nil
1371 }
1372
1373 mask := "*"
1374 if len(cmd.Params) > 0 {
1375 mask = cmd.Params[0]
1376 }
1377 dc.SendMessage(&irc.Message{
1378 Prefix: dc.srv.prefix(),
1379 Command: irc.RPL_ENDOFWHO,
1380 Params: []string{dc.nick, mask, "End of /WHO list"},
1381 })
1382 case irc.RPL_WHOISUSER:
1383 var nick, username, host, realname string
1384 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1385 return err
1386 }
1387
1388 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1389 nick := dc.marshalEntity(uc.network, nick)
1390 dc.SendMessage(&irc.Message{
1391 Prefix: dc.srv.prefix(),
1392 Command: irc.RPL_WHOISUSER,
1393 Params: []string{dc.nick, nick, username, host, "*", realname},
1394 })
1395 })
1396 case irc.RPL_WHOISSERVER:
1397 var nick, server, serverInfo string
1398 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1399 return err
1400 }
1401
1402 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1403 nick := dc.marshalEntity(uc.network, nick)
1404 dc.SendMessage(&irc.Message{
1405 Prefix: dc.srv.prefix(),
1406 Command: irc.RPL_WHOISSERVER,
1407 Params: []string{dc.nick, nick, server, serverInfo},
1408 })
1409 })
1410 case irc.RPL_WHOISOPERATOR:
1411 var nick string
1412 if err := parseMessageParams(msg, nil, &nick); err != nil {
1413 return err
1414 }
1415
1416 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1417 nick := dc.marshalEntity(uc.network, nick)
1418 dc.SendMessage(&irc.Message{
1419 Prefix: dc.srv.prefix(),
1420 Command: irc.RPL_WHOISOPERATOR,
1421 Params: []string{dc.nick, nick, "is an IRC operator"},
1422 })
1423 })
1424 case irc.RPL_WHOISIDLE:
1425 var nick string
1426 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1427 return err
1428 }
1429
1430 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1431 nick := dc.marshalEntity(uc.network, nick)
1432 params := []string{dc.nick, nick}
1433 params = append(params, msg.Params[2:]...)
1434 dc.SendMessage(&irc.Message{
1435 Prefix: dc.srv.prefix(),
1436 Command: irc.RPL_WHOISIDLE,
1437 Params: params,
1438 })
1439 })
1440 case irc.RPL_WHOISCHANNELS:
1441 var nick, channelList string
1442 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1443 return err
1444 }
1445 channels := splitSpace(channelList)
1446
1447 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1448 nick := dc.marshalEntity(uc.network, nick)
1449 channelList := make([]string, len(channels))
1450 for i, channel := range channels {
1451 prefix, channel := uc.parseMembershipPrefix(channel)
1452 channel = dc.marshalEntity(uc.network, channel)
1453 channelList[i] = prefix.Format(dc) + channel
1454 }
1455 channels := strings.Join(channelList, " ")
1456 dc.SendMessage(&irc.Message{
1457 Prefix: dc.srv.prefix(),
1458 Command: irc.RPL_WHOISCHANNELS,
1459 Params: []string{dc.nick, nick, channels},
1460 })
1461 })
1462 case irc.RPL_ENDOFWHOIS:
1463 var nick string
1464 if err := parseMessageParams(msg, nil, &nick); err != nil {
1465 return err
1466 }
1467
1468 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1469 nick := dc.marshalEntity(uc.network, nick)
1470 dc.SendMessage(&irc.Message{
1471 Prefix: dc.srv.prefix(),
1472 Command: irc.RPL_ENDOFWHOIS,
1473 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1474 })
1475 })
1476 case "INVITE":
1477 var nick, channel string
1478 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1479 return err
1480 }
1481
1482 weAreInvited := uc.isOurNick(nick)
1483
1484 uc.forEachDownstream(func(dc *downstreamConn) {
1485 if !weAreInvited && !dc.caps["invite-notify"] {
1486 return
1487 }
1488 dc.SendMessage(&irc.Message{
1489 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1490 Command: "INVITE",
1491 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1492 })
1493 })
1494 case irc.RPL_INVITING:
1495 var nick, channel string
1496 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1497 return err
1498 }
1499
1500 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1501 dc.SendMessage(&irc.Message{
1502 Prefix: dc.srv.prefix(),
1503 Command: irc.RPL_INVITING,
1504 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1505 })
1506 })
1507 case irc.RPL_MONONLINE, irc.RPL_MONOFFLINE:
1508 var targetsStr string
1509 if err := parseMessageParams(msg, nil, &targetsStr); err != nil {
1510 return err
1511 }
1512 targets := strings.Split(targetsStr, ",")
1513
1514 online := msg.Command == irc.RPL_MONONLINE
1515 for _, target := range targets {
1516 prefix := irc.ParsePrefix(target)
1517 uc.monitored.SetValue(prefix.Name, online)
1518 }
1519
1520 // Check if the nick we want is now free
1521 wantNick := GetNick(&uc.user.User, &uc.network.Network)
1522 wantNickCM := uc.network.casemap(wantNick)
1523 if !online && uc.nickCM != wantNickCM {
1524 found := false
1525 for _, target := range targets {
1526 prefix := irc.ParsePrefix(target)
1527 if uc.network.casemap(prefix.Name) == wantNickCM {
1528 found = true
1529 break
1530 }
1531 }
1532 if found {
1533 uc.logger.Printf("desired nick %q is now available", wantNick)
1534 uc.SendMessage(ctx, &irc.Message{
1535 Command: "NICK",
1536 Params: []string{wantNick},
1537 })
1538 }
1539 }
1540
1541 uc.forEachDownstream(func(dc *downstreamConn) {
1542 for _, target := range targets {
1543 prefix := irc.ParsePrefix(target)
1544 if dc.monitored.Has(prefix.Name) {
1545 dc.SendMessage(&irc.Message{
1546 Prefix: dc.srv.prefix(),
1547 Command: msg.Command,
1548 Params: []string{dc.nick, target},
1549 })
1550 }
1551 }
1552 })
1553 case irc.ERR_MONLISTFULL:
1554 var limit, targetsStr string
1555 if err := parseMessageParams(msg, nil, &limit, &targetsStr); err != nil {
1556 return err
1557 }
1558
1559 targets := strings.Split(targetsStr, ",")
1560 uc.forEachDownstream(func(dc *downstreamConn) {
1561 for _, target := range targets {
1562 if dc.monitored.Has(target) {
1563 dc.SendMessage(&irc.Message{
1564 Prefix: dc.srv.prefix(),
1565 Command: msg.Command,
1566 Params: []string{dc.nick, limit, target},
1567 })
1568 }
1569 }
1570 })
1571 case irc.RPL_AWAY:
1572 var nick, reason string
1573 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1574 return err
1575 }
1576
1577 uc.forEachDownstream(func(dc *downstreamConn) {
1578 dc.SendMessage(&irc.Message{
1579 Prefix: dc.srv.prefix(),
1580 Command: irc.RPL_AWAY,
1581 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1582 })
1583 })
1584 case "AWAY", "ACCOUNT":
1585 if msg.Prefix == nil {
1586 return fmt.Errorf("expected a prefix")
1587 }
1588
1589 uc.forEachDownstream(func(dc *downstreamConn) {
1590 dc.SendMessage(&irc.Message{
1591 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1592 Command: msg.Command,
1593 Params: msg.Params,
1594 })
1595 })
1596 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1597 var channel, mask string
1598 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1599 return err
1600 }
1601 var addNick, addTime string
1602 if len(msg.Params) >= 5 {
1603 addNick = msg.Params[3]
1604 addTime = msg.Params[4]
1605 }
1606
1607 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1608 channel := dc.marshalEntity(uc.network, channel)
1609
1610 var params []string
1611 if addNick != "" && addTime != "" {
1612 addNick := dc.marshalEntity(uc.network, addNick)
1613 params = []string{dc.nick, channel, mask, addNick, addTime}
1614 } else {
1615 params = []string{dc.nick, channel, mask}
1616 }
1617
1618 dc.SendMessage(&irc.Message{
1619 Prefix: dc.srv.prefix(),
1620 Command: msg.Command,
1621 Params: params,
1622 })
1623 })
1624 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1625 var channel, trailing string
1626 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1627 return err
1628 }
1629
1630 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1631 upstreamChannel := dc.marshalEntity(uc.network, channel)
1632 dc.SendMessage(&irc.Message{
1633 Prefix: dc.srv.prefix(),
1634 Command: msg.Command,
1635 Params: []string{dc.nick, upstreamChannel, trailing},
1636 })
1637 })
1638 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1639 var command, reason string
1640 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1641 return err
1642 }
1643
1644 if dc, _ := uc.dequeueCommand(command); dc != nil && downstreamID == 0 {
1645 downstreamID = dc.id
1646 }
1647
1648 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1649 dc.SendMessage(&irc.Message{
1650 Prefix: uc.srv.prefix(),
1651 Command: msg.Command,
1652 Params: []string{dc.nick, command, reason},
1653 })
1654 })
1655 case "FAIL":
1656 var command, code string
1657 if err := parseMessageParams(msg, &command, &code); err != nil {
1658 return err
1659 }
1660
1661 if !uc.registered && command == "*" && code == "ACCOUNT_REQUIRED" {
1662 return registrationError{msg}
1663 }
1664
1665 if dc, _ := uc.dequeueCommand(command); dc != nil && downstreamID == 0 {
1666 downstreamID = dc.id
1667 }
1668
1669 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1670 dc.SendMessage(msg)
1671 })
1672 case "ACK":
1673 // Ignore
1674 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1675 // Ignore
1676 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1677 // Ignore
1678 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1679 fallthrough
1680 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1681 fallthrough
1682 case rpl_localusers, rpl_globalusers:
1683 fallthrough
1684 case irc.RPL_MOTDSTART, irc.RPL_MOTD:
1685 // Ignore these messages if they're part of the initial registration
1686 // message burst. Forward them if the user explicitly asked for them.
1687 if !uc.gotMotd {
1688 return nil
1689 }
1690
1691 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1692 dc.SendMessage(&irc.Message{
1693 Prefix: uc.srv.prefix(),
1694 Command: msg.Command,
1695 Params: msg.Params,
1696 })
1697 })
1698 case irc.RPL_LISTSTART:
1699 // Ignore
1700 case "ERROR":
1701 var text string
1702 if err := parseMessageParams(msg, &text); err != nil {
1703 return err
1704 }
1705 return fmt.Errorf("fatal server error: %v", text)
1706 case irc.ERR_NICKNAMEINUSE:
1707 // At this point, we haven't received ISUPPORT so we don't know the
1708 // maximum nickname length or whether the server supports MONITOR. Many
1709 // servers have NICKLEN=30 so let's just use that.
1710 if !uc.registered && len(uc.nick)+1 < 30 {
1711 uc.nick = uc.nick + "_"
1712 uc.nickCM = uc.network.casemap(uc.nick)
1713 uc.logger.Printf("desired nick is not available, falling back to %q", uc.nick)
1714 uc.SendMessage(ctx, &irc.Message{
1715 Command: "NICK",
1716 Params: []string{uc.nick},
1717 })
1718 return nil
1719 }
1720 fallthrough
1721 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
1722 if !uc.registered {
1723 return registrationError{msg}
1724 }
1725 fallthrough
1726 default:
1727 uc.logger.Printf("unhandled message: %v", msg)
1728
1729 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1730 // best effort marshaling for unknown messages, replies and errors:
1731 // most numerics start with the user nick, marshal it if that's the case
1732 // otherwise, conservately keep the params without marshaling
1733 params := msg.Params
1734 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1735 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1736 params[0] = dc.nick
1737 }
1738 }
1739 dc.SendMessage(&irc.Message{
1740 Prefix: uc.srv.prefix(),
1741 Command: msg.Command,
1742 Params: params,
1743 })
1744 })
1745 }
1746 return nil
1747}
1748
1749func (uc *upstreamConn) handleDetachedMessage(ctx context.Context, ch *Channel, msg *irc.Message) {
1750 if uc.network.detachedMessageNeedsRelay(ch, msg) {
1751 uc.forEachDownstream(func(dc *downstreamConn) {
1752 dc.relayDetachedMessage(uc.network, msg)
1753 })
1754 }
1755 if ch.ReattachOn == FilterMessage || (ch.ReattachOn == FilterHighlight && uc.network.isHighlight(msg)) {
1756 uc.network.attach(ch)
1757 if err := uc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1758 uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
1759 }
1760 }
1761}
1762
1763func (uc *upstreamConn) handleChanModes(s string) error {
1764 parts := strings.SplitN(s, ",", 5)
1765 if len(parts) < 4 {
1766 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
1767 }
1768 modes := make(map[byte]channelModeType)
1769 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
1770 for j := 0; j < len(parts[i]); j++ {
1771 mode := parts[i][j]
1772 modes[mode] = mt
1773 }
1774 }
1775 uc.availableChannelModes = modes
1776 return nil
1777}
1778
1779func (uc *upstreamConn) handleMemberships(s string) error {
1780 if s == "" {
1781 uc.availableMemberships = nil
1782 return nil
1783 }
1784
1785 if s[0] != '(' {
1786 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1787 }
1788 sep := strings.IndexByte(s, ')')
1789 if sep < 0 || len(s) != sep*2 {
1790 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1791 }
1792 memberships := make([]membership, len(s)/2-1)
1793 for i := range memberships {
1794 memberships[i] = membership{
1795 Mode: s[i+1],
1796 Prefix: s[sep+i+1],
1797 }
1798 }
1799 uc.availableMemberships = memberships
1800 return nil
1801}
1802
1803func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1804 caps := strings.Fields(capsStr)
1805 for _, s := range caps {
1806 kv := strings.SplitN(s, "=", 2)
1807 k := strings.ToLower(kv[0])
1808 var v string
1809 if len(kv) == 2 {
1810 v = kv[1]
1811 }
1812 uc.supportedCaps[k] = v
1813 }
1814}
1815
1816func (uc *upstreamConn) requestCaps() {
1817 var requestCaps []string
1818 for c := range permanentUpstreamCaps {
1819 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1820 requestCaps = append(requestCaps, c)
1821 }
1822 }
1823
1824 if len(requestCaps) == 0 {
1825 return
1826 }
1827
1828 uc.SendMessage(context.TODO(), &irc.Message{
1829 Command: "CAP",
1830 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1831 })
1832}
1833
1834func (uc *upstreamConn) supportsSASL(mech string) bool {
1835 v, ok := uc.supportedCaps["sasl"]
1836 if !ok {
1837 return false
1838 }
1839
1840 if v == "" {
1841 return true
1842 }
1843
1844 mechanisms := strings.Split(v, ",")
1845 for _, mech := range mechanisms {
1846 if strings.EqualFold(mech, mech) {
1847 return true
1848 }
1849 }
1850 return false
1851}
1852
1853func (uc *upstreamConn) requestSASL() bool {
1854 if uc.network.SASL.Mechanism == "" {
1855 return false
1856 }
1857 return uc.supportsSASL(uc.network.SASL.Mechanism)
1858}
1859
1860func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1861 uc.caps[name] = ok
1862
1863 switch name {
1864 case "sasl":
1865 if !uc.requestSASL() {
1866 return nil
1867 }
1868 if !ok {
1869 uc.logger.Printf("server refused to acknowledge the SASL capability")
1870 return nil
1871 }
1872
1873 auth := &uc.network.SASL
1874 switch auth.Mechanism {
1875 case "PLAIN":
1876 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1877 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1878 case "EXTERNAL":
1879 uc.logger.Printf("starting SASL EXTERNAL authentication")
1880 uc.saslClient = sasl.NewExternalClient("")
1881 default:
1882 return fmt.Errorf("unsupported SASL mechanism %q", name)
1883 }
1884
1885 uc.SendMessage(context.TODO(), &irc.Message{
1886 Command: "AUTHENTICATE",
1887 Params: []string{auth.Mechanism},
1888 })
1889 default:
1890 if permanentUpstreamCaps[name] {
1891 break
1892 }
1893 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1894 }
1895 return nil
1896}
1897
1898func splitSpace(s string) []string {
1899 return strings.FieldsFunc(s, func(r rune) bool {
1900 return r == ' '
1901 })
1902}
1903
1904func (uc *upstreamConn) register() {
1905 ctx := context.TODO()
1906
1907 uc.nick = GetNick(&uc.user.User, &uc.network.Network)
1908 uc.nickCM = uc.network.casemap(uc.nick)
1909 uc.username = GetUsername(&uc.user.User, &uc.network.Network)
1910 uc.realname = GetRealname(&uc.user.User, &uc.network.Network)
1911
1912 uc.SendMessage(ctx, &irc.Message{
1913 Command: "CAP",
1914 Params: []string{"LS", "302"},
1915 })
1916
1917 if uc.network.Pass != "" {
1918 uc.SendMessage(ctx, &irc.Message{
1919 Command: "PASS",
1920 Params: []string{uc.network.Pass},
1921 })
1922 }
1923
1924 uc.SendMessage(ctx, &irc.Message{
1925 Command: "NICK",
1926 Params: []string{uc.nick},
1927 })
1928 uc.SendMessage(ctx, &irc.Message{
1929 Command: "USER",
1930 Params: []string{uc.username, "0", "*", uc.realname},
1931 })
1932}
1933
1934func (uc *upstreamConn) ReadMessage() (*irc.Message, error) {
1935 msg, err := uc.conn.ReadMessage()
1936 if err != nil {
1937 return nil, err
1938 }
1939 uc.srv.metrics.upstreamInMessagesTotal.Inc()
1940 return msg, nil
1941}
1942
1943func (uc *upstreamConn) runUntilRegistered() error {
1944 for !uc.registered {
1945 msg, err := uc.ReadMessage()
1946 if err != nil {
1947 return fmt.Errorf("failed to read message: %v", err)
1948 }
1949
1950 if err := uc.handleMessage(context.TODO(), msg); err != nil {
1951 if _, ok := err.(registrationError); ok {
1952 return err
1953 } else {
1954 msg.Tags = nil // prevent message tags from cluttering logs
1955 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1956 }
1957 }
1958 }
1959
1960 for _, command := range uc.network.ConnectCommands {
1961 m, err := irc.ParseMessage(command)
1962 if err != nil {
1963 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1964 } else {
1965 uc.SendMessage(context.TODO(), m)
1966 }
1967 }
1968
1969 return nil
1970}
1971
1972func (uc *upstreamConn) readMessages(ch chan<- event) error {
1973 for {
1974 msg, err := uc.ReadMessage()
1975 if errors.Is(err, io.EOF) {
1976 break
1977 } else if err != nil {
1978 return fmt.Errorf("failed to read IRC command: %v", err)
1979 }
1980
1981 ch <- eventUpstreamMessage{msg, uc}
1982 }
1983
1984 return nil
1985}
1986
1987func (uc *upstreamConn) SendMessage(ctx context.Context, msg *irc.Message) {
1988 if !uc.caps["message-tags"] {
1989 msg = msg.Copy()
1990 msg.Tags = nil
1991 }
1992
1993 uc.srv.metrics.upstreamOutMessagesTotal.Inc()
1994 uc.conn.SendMessage(ctx, msg)
1995}
1996
1997func (uc *upstreamConn) SendMessageLabeled(ctx context.Context, downstreamID uint64, msg *irc.Message) {
1998 if uc.caps["labeled-response"] {
1999 if msg.Tags == nil {
2000 msg.Tags = make(map[string]irc.TagValue)
2001 }
2002 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
2003 uc.nextLabelID++
2004 }
2005 uc.SendMessage(ctx, msg)
2006}
2007
2008// appendLog appends a message to the log file.
2009//
2010// The internal message ID is returned. If the message isn't recorded in the
2011// log file, an empty string is returned.
2012func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string) {
2013 if uc.user.msgStore == nil {
2014 return ""
2015 }
2016
2017 // Don't store messages with a server mask target
2018 if strings.HasPrefix(entity, "$") {
2019 return ""
2020 }
2021
2022 entityCM := uc.network.casemap(entity)
2023 if entityCM == "nickserv" {
2024 // The messages sent/received from NickServ may contain
2025 // security-related information (like passwords). Don't store these.
2026 return ""
2027 }
2028
2029 if !uc.network.delivered.HasTarget(entity) {
2030 // This is the first message we receive from this target. Save the last
2031 // message ID in delivery receipts, so that we can send the new message
2032 // in the backlog if an offline client reconnects.
2033 lastID, err := uc.user.msgStore.LastMsgID(&uc.network.Network, entityCM, time.Now())
2034 if err != nil {
2035 uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
2036 return ""
2037 }
2038
2039 uc.network.delivered.ForEachClient(func(clientName string) {
2040 uc.network.delivered.StoreID(entity, clientName, lastID)
2041 })
2042 }
2043
2044 msgID, err := uc.user.msgStore.Append(&uc.network.Network, entityCM, msg)
2045 if err != nil {
2046 uc.logger.Printf("failed to append message to store: %v", err)
2047 return ""
2048 }
2049
2050 return msgID
2051}
2052
2053// produce appends a message to the logs and forwards it to connected downstream
2054// connections.
2055//
2056// If origin is not nil and origin doesn't support echo-message, the message is
2057// forwarded to all connections except origin.
2058func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
2059 var msgID string
2060 if target != "" {
2061 msgID = uc.appendLog(target, msg)
2062 }
2063
2064 // Don't forward messages if it's a detached channel
2065 ch := uc.network.channels.Value(target)
2066 detached := ch != nil && ch.Detached
2067
2068 uc.forEachDownstream(func(dc *downstreamConn) {
2069 if !detached && (dc != origin || dc.caps["echo-message"]) {
2070 dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
2071 } else {
2072 dc.advanceMessageWithID(msg, msgID)
2073 }
2074 })
2075}
2076
2077func (uc *upstreamConn) updateAway() {
2078 ctx := context.TODO()
2079
2080 away := true
2081 uc.forEachDownstream(func(*downstreamConn) {
2082 away = false
2083 })
2084 if away == uc.away {
2085 return
2086 }
2087 if away {
2088 uc.SendMessage(ctx, &irc.Message{
2089 Command: "AWAY",
2090 Params: []string{"Auto away"},
2091 })
2092 } else {
2093 uc.SendMessage(ctx, &irc.Message{
2094 Command: "AWAY",
2095 })
2096 }
2097 uc.away = away
2098}
2099
2100func (uc *upstreamConn) updateChannelAutoDetach(name string) {
2101 uch := uc.channels.Value(name)
2102 if uch == nil {
2103 return
2104 }
2105 ch := uc.network.channels.Value(name)
2106 if ch == nil || ch.Detached {
2107 return
2108 }
2109 uch.updateAutoDetach(ch.DetachAfter)
2110}
2111
2112func (uc *upstreamConn) updateMonitor() {
2113 if _, ok := uc.isupport["MONITOR"]; !ok {
2114 return
2115 }
2116
2117 ctx := context.TODO()
2118
2119 add := make(map[string]struct{})
2120 var addList []string
2121 seen := make(map[string]struct{})
2122 uc.forEachDownstream(func(dc *downstreamConn) {
2123 for targetCM := range dc.monitored.innerMap {
2124 if !uc.monitored.Has(targetCM) {
2125 if _, ok := add[targetCM]; !ok {
2126 addList = append(addList, targetCM)
2127 add[targetCM] = struct{}{}
2128 }
2129 } else {
2130 seen[targetCM] = struct{}{}
2131 }
2132 }
2133 })
2134
2135 wantNick := GetNick(&uc.user.User, &uc.network.Network)
2136 wantNickCM := uc.network.casemap(wantNick)
2137 if _, ok := add[wantNickCM]; !ok && !uc.monitored.Has(wantNick) && !uc.isOurNick(wantNick) {
2138 addList = append(addList, wantNickCM)
2139 add[wantNickCM] = struct{}{}
2140 }
2141
2142 removeAll := true
2143 var removeList []string
2144 for targetCM, entry := range uc.monitored.innerMap {
2145 if _, ok := seen[targetCM]; ok {
2146 removeAll = false
2147 } else {
2148 removeList = append(removeList, entry.originalKey)
2149 }
2150 }
2151
2152 // TODO: better handle the case where len(uc.monitored) + len(addList)
2153 // exceeds the limit, probably by immediately sending ERR_MONLISTFULL?
2154
2155 if removeAll && len(addList) == 0 && len(removeList) > 0 {
2156 // Optimization when the last MONITOR-aware downstream disconnects
2157 uc.SendMessage(ctx, &irc.Message{
2158 Command: "MONITOR",
2159 Params: []string{"C"},
2160 })
2161 } else {
2162 msgs := generateMonitor("-", removeList)
2163 msgs = append(msgs, generateMonitor("+", addList)...)
2164 for _, msg := range msgs {
2165 uc.SendMessage(ctx, msg)
2166 }
2167 }
2168
2169 for _, target := range removeList {
2170 uc.monitored.Delete(target)
2171 }
2172}
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