source: code/trunk/upstream.go@ 299

Last change on this file since 299 was 296, checked in by delthas, 5 years ago

Update downstream nicks in single-server mode and after NICK

Previously, the downstream nick was never changed, even when the
downstream sent a NICK message or was in single-server mode with a
different nick.

This adds support for updating the downstream nick in the following
cases:

  • when a downstream sends NICK
  • additionally, in single-server mode:
    • when a downstream connects and its single network is connected
    • when an upstream connects
    • when an upstream sends NICK
File size: 37.6 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "errors"
7 "fmt"
8 "io"
9 "net"
10 "strconv"
11 "strings"
12 "time"
13 "unicode"
14 "unicode/utf8"
15
16 "github.com/emersion/go-sasl"
17 "gopkg.in/irc.v3"
18)
19
20// permanentUpstreamCaps is the static list of upstream capabilities always
21// requested when supported.
22var permanentUpstreamCaps = map[string]bool{
23 "away-notify": true,
24 "batch": true,
25 "labeled-response": true,
26 "message-tags": true,
27 "multi-prefix": true,
28 "server-time": true,
29}
30
31type upstreamChannel struct {
32 Name string
33 conn *upstreamConn
34 Topic string
35 TopicWho string
36 TopicTime time.Time
37 Status channelStatus
38 modes channelModes
39 creationTime string
40 Members map[string]*memberships
41 complete bool
42}
43
44type upstreamConn struct {
45 conn
46
47 network *network
48 user *user
49
50 serverName string
51 availableUserModes string
52 availableChannelModes map[byte]channelModeType
53 availableChannelTypes string
54 availableMemberships []membership
55
56 registered bool
57 nick string
58 username string
59 realname string
60 modes userModes
61 channels map[string]*upstreamChannel
62 supportedCaps map[string]string
63 caps map[string]bool
64 batches map[string]batch
65 away bool
66 nextLabelID uint64
67
68 saslClient sasl.Client
69 saslStarted bool
70
71 // set of LIST commands in progress, per downstream
72 pendingLISTDownstreamSet map[uint64]struct{}
73
74 messageLoggers map[string]*messageLogger
75}
76
77func connectToUpstream(network *network) (*upstreamConn, error) {
78 logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
79
80 var scheme string
81 var addr string
82
83 addrParts := strings.SplitN(network.Addr, "://", 2)
84 if len(addrParts) == 2 {
85 scheme = addrParts[0]
86 addr = addrParts[1]
87 } else {
88 scheme = "ircs"
89 addr = addrParts[0]
90 }
91
92 dialer := net.Dialer{Timeout: connectTimeout}
93
94 var netConn net.Conn
95 var err error
96 switch scheme {
97 case "ircs":
98 if !strings.ContainsRune(addr, ':') {
99 addr = addr + ":6697"
100 }
101
102 logger.Printf("connecting to TLS server at address %q", addr)
103 netConn, err = tls.DialWithDialer(&dialer, "tcp", addr, nil)
104 case "irc+insecure":
105 if !strings.ContainsRune(addr, ':') {
106 addr = addr + ":6667"
107 }
108
109 logger.Printf("connecting to plain-text server at address %q", addr)
110 netConn, err = dialer.Dial("tcp", addr)
111 default:
112 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", addr, scheme)
113 }
114 if err != nil {
115 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
116 }
117
118 uc := &upstreamConn{
119 conn: *newConn(network.user.srv, netConn, logger),
120 network: network,
121 user: network.user,
122 channels: make(map[string]*upstreamChannel),
123 supportedCaps: make(map[string]string),
124 caps: make(map[string]bool),
125 batches: make(map[string]batch),
126 availableChannelTypes: stdChannelTypes,
127 availableChannelModes: stdChannelModes,
128 availableMemberships: stdMemberships,
129 pendingLISTDownstreamSet: make(map[uint64]struct{}),
130 messageLoggers: make(map[string]*messageLogger),
131 }
132
133 return uc, nil
134}
135
136func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
137 uc.network.forEachDownstream(f)
138}
139
140func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
141 uc.forEachDownstream(func(dc *downstreamConn) {
142 if id != 0 && id != dc.id {
143 return
144 }
145 f(dc)
146 })
147}
148
149func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
150 ch, ok := uc.channels[name]
151 if !ok {
152 return nil, fmt.Errorf("unknown channel %q", name)
153 }
154 return ch, nil
155}
156
157func (uc *upstreamConn) isChannel(entity string) bool {
158 if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
159 return true
160 }
161 return false
162}
163
164func (uc *upstreamConn) getPendingLIST() *pendingLIST {
165 for _, pl := range uc.user.pendingLISTs {
166 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
167 continue
168 }
169 return &pl
170 }
171 return nil
172}
173
174func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
175 found = false
176 for i := 0; i < len(uc.user.pendingLISTs); i++ {
177 pl := uc.user.pendingLISTs[i]
178 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
179 continue
180 }
181 delete(pl.pendingCommands, uc.network.ID)
182 if len(pl.pendingCommands) == 0 {
183 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
184 i--
185 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
186 dc.SendMessage(&irc.Message{
187 Prefix: dc.srv.prefix(),
188 Command: irc.RPL_LISTEND,
189 Params: []string{dc.nick, "End of /LIST"},
190 })
191 })
192 }
193 found = true
194 if !all {
195 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
196 uc.user.forEachUpstream(func(uc *upstreamConn) {
197 uc.trySendLIST(pl.downstreamID)
198 })
199 return
200 }
201 }
202 return
203}
204
205func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
206 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
207 // a LIST command is already pending
208 // we will try again when that command is completed
209 return
210 }
211
212 for _, pl := range uc.user.pendingLISTs {
213 if pl.downstreamID != downstreamID {
214 continue
215 }
216 // this is the first pending LIST command list of the downstream
217 listCommand, ok := pl.pendingCommands[uc.network.ID]
218 if !ok {
219 // there is no command for this upstream in these LIST commands
220 // do not send anything
221 continue
222 }
223 // there is a command for this upstream in these LIST commands
224 // send it now
225
226 uc.SendMessageLabeled(downstreamID, listCommand)
227
228 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
229 return
230 }
231}
232
233func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
234 memberships := make(memberships, 0, 4)
235 i := 0
236 for _, m := range uc.availableMemberships {
237 if i >= len(s) {
238 break
239 }
240 if s[i] == m.Prefix {
241 memberships = append(memberships, m)
242 i++
243 }
244 }
245 return &memberships, s[i:]
246}
247
248func isWordBoundary(r rune) bool {
249 switch r {
250 case '-', '_', '|':
251 return false
252 case '\u00A0':
253 return true
254 default:
255 return !unicode.IsLetter(r) && !unicode.IsNumber(r)
256 }
257}
258
259func isHighlight(text, nick string) bool {
260 for {
261 i := strings.Index(text, nick)
262 if i < 0 {
263 return false
264 }
265
266 // Detect word boundaries
267 var left, right rune
268 if i > 0 {
269 left, _ = utf8.DecodeLastRuneInString(text[:i])
270 }
271 if i < len(text) {
272 right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
273 }
274 if isWordBoundary(left) && isWordBoundary(right) {
275 return true
276 }
277
278 text = text[i+len(nick):]
279 }
280}
281
282func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
283 var label string
284 if l, ok := msg.GetTag("label"); ok {
285 label = l
286 }
287
288 var msgBatch *batch
289 if batchName, ok := msg.GetTag("batch"); ok {
290 b, ok := uc.batches[batchName]
291 if !ok {
292 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
293 }
294 msgBatch = &b
295 if label == "" {
296 label = msgBatch.Label
297 }
298 }
299
300 var downstreamID uint64 = 0
301 if label != "" {
302 var labelOffset uint64
303 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
304 if err == nil && n < 2 {
305 err = errors.New("not enough arguments")
306 }
307 if err != nil {
308 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
309 }
310 }
311
312 if _, ok := msg.Tags["time"]; !ok {
313 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
314 }
315
316 switch msg.Command {
317 case "PING":
318 uc.SendMessage(&irc.Message{
319 Command: "PONG",
320 Params: msg.Params,
321 })
322 return nil
323 case "NOTICE", "PRIVMSG":
324 if msg.Prefix == nil {
325 return fmt.Errorf("expected a prefix")
326 }
327
328 var entity, text string
329 if err := parseMessageParams(msg, &entity, &text); err != nil {
330 return err
331 }
332
333 if msg.Prefix.Name == serviceNick {
334 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
335 break
336 }
337 if entity == serviceNick {
338 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
339 break
340 }
341
342 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
343 uc.produce("", msg, nil)
344 } else { // regular user NOTICE or PRIVMSG
345 target := entity
346 if target == uc.nick {
347 target = msg.Prefix.Name
348 }
349 uc.produce(target, msg, nil)
350
351 highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
352 if ch, ok := uc.network.channels[target]; ok && ch.Detached && highlight {
353 uc.forEachDownstream(func(dc *downstreamConn) {
354 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), msg.Prefix.Name, text))
355 })
356 }
357 }
358 case "CAP":
359 var subCmd string
360 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
361 return err
362 }
363 subCmd = strings.ToUpper(subCmd)
364 subParams := msg.Params[2:]
365 switch subCmd {
366 case "LS":
367 if len(subParams) < 1 {
368 return newNeedMoreParamsError(msg.Command)
369 }
370 caps := subParams[len(subParams)-1]
371 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
372
373 uc.handleSupportedCaps(caps)
374
375 if more {
376 break // wait to receive all capabilities
377 }
378
379 uc.requestCaps()
380
381 if uc.requestSASL() {
382 break // we'll send CAP END after authentication is completed
383 }
384
385 uc.SendMessage(&irc.Message{
386 Command: "CAP",
387 Params: []string{"END"},
388 })
389 case "ACK", "NAK":
390 if len(subParams) < 1 {
391 return newNeedMoreParamsError(msg.Command)
392 }
393 caps := strings.Fields(subParams[0])
394
395 for _, name := range caps {
396 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
397 return err
398 }
399 }
400
401 if uc.registered {
402 uc.forEachDownstream(func(dc *downstreamConn) {
403 dc.updateSupportedCaps()
404 })
405 }
406 case "NEW":
407 if len(subParams) < 1 {
408 return newNeedMoreParamsError(msg.Command)
409 }
410 uc.handleSupportedCaps(subParams[0])
411 uc.requestCaps()
412 case "DEL":
413 if len(subParams) < 1 {
414 return newNeedMoreParamsError(msg.Command)
415 }
416 caps := strings.Fields(subParams[0])
417
418 for _, c := range caps {
419 delete(uc.supportedCaps, c)
420 delete(uc.caps, c)
421 }
422
423 if uc.registered {
424 uc.forEachDownstream(func(dc *downstreamConn) {
425 dc.updateSupportedCaps()
426 })
427 }
428 default:
429 uc.logger.Printf("unhandled message: %v", msg)
430 }
431 case "AUTHENTICATE":
432 if uc.saslClient == nil {
433 return fmt.Errorf("received unexpected AUTHENTICATE message")
434 }
435
436 // TODO: if a challenge is 400 bytes long, buffer it
437 var challengeStr string
438 if err := parseMessageParams(msg, &challengeStr); err != nil {
439 uc.SendMessage(&irc.Message{
440 Command: "AUTHENTICATE",
441 Params: []string{"*"},
442 })
443 return err
444 }
445
446 var challenge []byte
447 if challengeStr != "+" {
448 var err error
449 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
450 if err != nil {
451 uc.SendMessage(&irc.Message{
452 Command: "AUTHENTICATE",
453 Params: []string{"*"},
454 })
455 return err
456 }
457 }
458
459 var resp []byte
460 var err error
461 if !uc.saslStarted {
462 _, resp, err = uc.saslClient.Start()
463 uc.saslStarted = true
464 } else {
465 resp, err = uc.saslClient.Next(challenge)
466 }
467 if err != nil {
468 uc.SendMessage(&irc.Message{
469 Command: "AUTHENTICATE",
470 Params: []string{"*"},
471 })
472 return err
473 }
474
475 // TODO: send response in multiple chunks if >= 400 bytes
476 var respStr = "+"
477 if resp != nil {
478 respStr = base64.StdEncoding.EncodeToString(resp)
479 }
480
481 uc.SendMessage(&irc.Message{
482 Command: "AUTHENTICATE",
483 Params: []string{respStr},
484 })
485 case irc.RPL_LOGGEDIN:
486 var account string
487 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
488 return err
489 }
490 uc.logger.Printf("logged in with account %q", account)
491 case irc.RPL_LOGGEDOUT:
492 uc.logger.Printf("logged out")
493 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
494 var info string
495 if err := parseMessageParams(msg, nil, &info); err != nil {
496 return err
497 }
498 switch msg.Command {
499 case irc.ERR_NICKLOCKED:
500 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
501 case irc.ERR_SASLFAIL:
502 uc.logger.Printf("SASL authentication failed: %v", info)
503 case irc.ERR_SASLTOOLONG:
504 uc.logger.Printf("SASL message too long: %v", info)
505 }
506
507 uc.saslClient = nil
508 uc.saslStarted = false
509
510 uc.SendMessage(&irc.Message{
511 Command: "CAP",
512 Params: []string{"END"},
513 })
514 case irc.RPL_WELCOME:
515 uc.registered = true
516 uc.logger.Printf("connection registered")
517
518 uc.forEachDownstream(func(dc *downstreamConn) {
519 dc.updateSupportedCaps()
520 })
521
522 for _, ch := range uc.network.channels {
523 params := []string{ch.Name}
524 if ch.Key != "" {
525 params = append(params, ch.Key)
526 }
527 uc.SendMessage(&irc.Message{
528 Command: "JOIN",
529 Params: params,
530 })
531 }
532 case irc.RPL_MYINFO:
533 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
534 return err
535 }
536 case irc.RPL_ISUPPORT:
537 if err := parseMessageParams(msg, nil, nil); err != nil {
538 return err
539 }
540 for _, token := range msg.Params[1 : len(msg.Params)-1] {
541 negate := false
542 parameter := token
543 value := ""
544 if strings.HasPrefix(token, "-") {
545 negate = true
546 token = token[1:]
547 } else {
548 if i := strings.IndexByte(token, '='); i >= 0 {
549 parameter = token[:i]
550 value = token[i+1:]
551 }
552 }
553 if !negate {
554 switch parameter {
555 case "CHANMODES":
556 parts := strings.SplitN(value, ",", 5)
557 if len(parts) < 4 {
558 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
559 }
560 modes := make(map[byte]channelModeType)
561 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
562 for j := 0; j < len(parts[i]); j++ {
563 mode := parts[i][j]
564 modes[mode] = mt
565 }
566 }
567 uc.availableChannelModes = modes
568 case "CHANTYPES":
569 uc.availableChannelTypes = value
570 case "PREFIX":
571 if value == "" {
572 uc.availableMemberships = nil
573 } else {
574 if value[0] != '(' {
575 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
576 }
577 sep := strings.IndexByte(value, ')')
578 if sep < 0 || len(value) != sep*2 {
579 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
580 }
581 memberships := make([]membership, len(value)/2-1)
582 for i := range memberships {
583 memberships[i] = membership{
584 Mode: value[i+1],
585 Prefix: value[sep+i+1],
586 }
587 }
588 uc.availableMemberships = memberships
589 }
590 }
591 } else {
592 // TODO: handle ISUPPORT negations
593 }
594 }
595 case "BATCH":
596 var tag string
597 if err := parseMessageParams(msg, &tag); err != nil {
598 return err
599 }
600
601 if strings.HasPrefix(tag, "+") {
602 tag = tag[1:]
603 if _, ok := uc.batches[tag]; ok {
604 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
605 }
606 var batchType string
607 if err := parseMessageParams(msg, nil, &batchType); err != nil {
608 return err
609 }
610 label := label
611 if label == "" && msgBatch != nil {
612 label = msgBatch.Label
613 }
614 uc.batches[tag] = batch{
615 Type: batchType,
616 Params: msg.Params[2:],
617 Outer: msgBatch,
618 Label: label,
619 }
620 } else if strings.HasPrefix(tag, "-") {
621 tag = tag[1:]
622 if _, ok := uc.batches[tag]; !ok {
623 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
624 }
625 delete(uc.batches, tag)
626 } else {
627 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
628 }
629 case "NICK":
630 if msg.Prefix == nil {
631 return fmt.Errorf("expected a prefix")
632 }
633
634 var newNick string
635 if err := parseMessageParams(msg, &newNick); err != nil {
636 return err
637 }
638
639 me := false
640 if msg.Prefix.Name == uc.nick {
641 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
642 me = true
643 uc.nick = newNick
644 }
645
646 for _, ch := range uc.channels {
647 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
648 delete(ch.Members, msg.Prefix.Name)
649 ch.Members[newNick] = memberships
650 uc.appendLog(ch.Name, msg)
651 uc.appendHistory(ch.Name, msg)
652 }
653 }
654
655 if !me {
656 uc.forEachDownstream(func(dc *downstreamConn) {
657 dc.SendMessage(dc.marshalMessage(msg, uc.network))
658 })
659 } else {
660 uc.forEachDownstream(func(dc *downstreamConn) {
661 dc.updateNick()
662 })
663 }
664 case "JOIN":
665 if msg.Prefix == nil {
666 return fmt.Errorf("expected a prefix")
667 }
668
669 var channels string
670 if err := parseMessageParams(msg, &channels); err != nil {
671 return err
672 }
673
674 for _, ch := range strings.Split(channels, ",") {
675 if msg.Prefix.Name == uc.nick {
676 uc.logger.Printf("joined channel %q", ch)
677 uc.channels[ch] = &upstreamChannel{
678 Name: ch,
679 conn: uc,
680 Members: make(map[string]*memberships),
681 }
682
683 uc.SendMessage(&irc.Message{
684 Command: "MODE",
685 Params: []string{ch},
686 })
687 } else {
688 ch, err := uc.getChannel(ch)
689 if err != nil {
690 return err
691 }
692 ch.Members[msg.Prefix.Name] = &memberships{}
693 }
694
695 chMsg := msg.Copy()
696 chMsg.Params[0] = ch
697 uc.produce(ch, chMsg, nil)
698 }
699 case "PART":
700 if msg.Prefix == nil {
701 return fmt.Errorf("expected a prefix")
702 }
703
704 var channels string
705 if err := parseMessageParams(msg, &channels); err != nil {
706 return err
707 }
708
709 for _, ch := range strings.Split(channels, ",") {
710 if msg.Prefix.Name == uc.nick {
711 uc.logger.Printf("parted channel %q", ch)
712 delete(uc.channels, ch)
713 } else {
714 ch, err := uc.getChannel(ch)
715 if err != nil {
716 return err
717 }
718 delete(ch.Members, msg.Prefix.Name)
719 }
720
721 chMsg := msg.Copy()
722 chMsg.Params[0] = ch
723 uc.produce(ch, chMsg, nil)
724 }
725 case "KICK":
726 if msg.Prefix == nil {
727 return fmt.Errorf("expected a prefix")
728 }
729
730 var channel, user string
731 if err := parseMessageParams(msg, &channel, &user); err != nil {
732 return err
733 }
734
735 if user == uc.nick {
736 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
737 delete(uc.channels, channel)
738 } else {
739 ch, err := uc.getChannel(channel)
740 if err != nil {
741 return err
742 }
743 delete(ch.Members, user)
744 }
745
746 uc.produce(channel, msg, nil)
747 case "QUIT":
748 if msg.Prefix == nil {
749 return fmt.Errorf("expected a prefix")
750 }
751
752 if msg.Prefix.Name == uc.nick {
753 uc.logger.Printf("quit")
754 }
755
756 for _, ch := range uc.channels {
757 if _, ok := ch.Members[msg.Prefix.Name]; ok {
758 delete(ch.Members, msg.Prefix.Name)
759
760 uc.appendLog(ch.Name, msg)
761 uc.appendHistory(ch.Name, msg)
762 }
763 }
764
765 if msg.Prefix.Name != uc.nick {
766 uc.forEachDownstream(func(dc *downstreamConn) {
767 dc.SendMessage(dc.marshalMessage(msg, uc.network))
768 })
769 }
770 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
771 var name, topic string
772 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
773 return err
774 }
775 ch, err := uc.getChannel(name)
776 if err != nil {
777 return err
778 }
779 if msg.Command == irc.RPL_TOPIC {
780 ch.Topic = topic
781 } else {
782 ch.Topic = ""
783 }
784 case "TOPIC":
785 var name string
786 if err := parseMessageParams(msg, &name); err != nil {
787 return err
788 }
789 ch, err := uc.getChannel(name)
790 if err != nil {
791 return err
792 }
793 if len(msg.Params) > 1 {
794 ch.Topic = msg.Params[1]
795 } else {
796 ch.Topic = ""
797 }
798 uc.produce(ch.Name, msg, nil)
799 case "MODE":
800 var name, modeStr string
801 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
802 return err
803 }
804
805 if !uc.isChannel(name) { // user mode change
806 if name != uc.nick {
807 return fmt.Errorf("received MODE message for unknown nick %q", name)
808 }
809 return uc.modes.Apply(modeStr)
810 // TODO: notify downstreams about user mode change?
811 } else { // channel mode change
812 ch, err := uc.getChannel(name)
813 if err != nil {
814 return err
815 }
816
817 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
818 if err != nil {
819 return err
820 }
821
822 uc.appendLog(ch.Name, msg)
823 uc.forEachDownstream(func(dc *downstreamConn) {
824 params := make([]string, len(msg.Params))
825 params[0] = dc.marshalEntity(uc.network, name)
826 params[1] = modeStr
827
828 copy(params[2:], msg.Params[2:])
829 for i, modeParam := range params[2:] {
830 if _, ok := needMarshaling[i]; ok {
831 params[2+i] = dc.marshalEntity(uc.network, modeParam)
832 }
833 }
834
835 dc.SendMessage(&irc.Message{
836 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
837 Command: "MODE",
838 Params: params,
839 })
840 })
841 }
842 case irc.RPL_UMODEIS:
843 if err := parseMessageParams(msg, nil); err != nil {
844 return err
845 }
846 modeStr := ""
847 if len(msg.Params) > 1 {
848 modeStr = msg.Params[1]
849 }
850
851 uc.modes = ""
852 if err := uc.modes.Apply(modeStr); err != nil {
853 return err
854 }
855 // TODO: send RPL_UMODEIS to downstream connections when applicable
856 case irc.RPL_CHANNELMODEIS:
857 var channel string
858 if err := parseMessageParams(msg, nil, &channel); err != nil {
859 return err
860 }
861 modeStr := ""
862 if len(msg.Params) > 2 {
863 modeStr = msg.Params[2]
864 }
865
866 ch, err := uc.getChannel(channel)
867 if err != nil {
868 return err
869 }
870
871 firstMode := ch.modes == nil
872 ch.modes = make(map[byte]string)
873 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
874 return err
875 }
876 if firstMode {
877 modeStr, modeParams := ch.modes.Format()
878
879 uc.forEachDownstream(func(dc *downstreamConn) {
880 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
881 params = append(params, modeParams...)
882
883 dc.SendMessage(&irc.Message{
884 Prefix: dc.srv.prefix(),
885 Command: irc.RPL_CHANNELMODEIS,
886 Params: params,
887 })
888 })
889 }
890 case rpl_creationtime:
891 var channel, creationTime string
892 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
893 return err
894 }
895
896 ch, err := uc.getChannel(channel)
897 if err != nil {
898 return err
899 }
900
901 firstCreationTime := ch.creationTime == ""
902 ch.creationTime = creationTime
903 if firstCreationTime {
904 uc.forEachDownstream(func(dc *downstreamConn) {
905 dc.SendMessage(&irc.Message{
906 Prefix: dc.srv.prefix(),
907 Command: rpl_creationtime,
908 Params: []string{dc.nick, channel, creationTime},
909 })
910 })
911 }
912 case rpl_topicwhotime:
913 var name, who, timeStr string
914 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
915 return err
916 }
917 ch, err := uc.getChannel(name)
918 if err != nil {
919 return err
920 }
921 ch.TopicWho = who
922 sec, err := strconv.ParseInt(timeStr, 10, 64)
923 if err != nil {
924 return fmt.Errorf("failed to parse topic time: %v", err)
925 }
926 ch.TopicTime = time.Unix(sec, 0)
927 case irc.RPL_LIST:
928 var channel, clients, topic string
929 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
930 return err
931 }
932
933 pl := uc.getPendingLIST()
934 if pl == nil {
935 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
936 }
937
938 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
939 dc.SendMessage(&irc.Message{
940 Prefix: dc.srv.prefix(),
941 Command: irc.RPL_LIST,
942 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
943 })
944 })
945 case irc.RPL_LISTEND:
946 ok := uc.endPendingLISTs(false)
947 if !ok {
948 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
949 }
950 case irc.RPL_NAMREPLY:
951 var name, statusStr, members string
952 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
953 return err
954 }
955
956 ch, ok := uc.channels[name]
957 if !ok {
958 // NAMES on a channel we have not joined, forward to downstream
959 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
960 channel := dc.marshalEntity(uc.network, name)
961 members := splitSpace(members)
962 for i, member := range members {
963 memberships, nick := uc.parseMembershipPrefix(member)
964 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
965 }
966 memberStr := strings.Join(members, " ")
967
968 dc.SendMessage(&irc.Message{
969 Prefix: dc.srv.prefix(),
970 Command: irc.RPL_NAMREPLY,
971 Params: []string{dc.nick, statusStr, channel, memberStr},
972 })
973 })
974 return nil
975 }
976
977 status, err := parseChannelStatus(statusStr)
978 if err != nil {
979 return err
980 }
981 ch.Status = status
982
983 for _, s := range splitSpace(members) {
984 memberships, nick := uc.parseMembershipPrefix(s)
985 ch.Members[nick] = memberships
986 }
987 case irc.RPL_ENDOFNAMES:
988 var name string
989 if err := parseMessageParams(msg, nil, &name); err != nil {
990 return err
991 }
992
993 ch, ok := uc.channels[name]
994 if !ok {
995 // NAMES on a channel we have not joined, forward to downstream
996 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
997 channel := dc.marshalEntity(uc.network, name)
998
999 dc.SendMessage(&irc.Message{
1000 Prefix: dc.srv.prefix(),
1001 Command: irc.RPL_ENDOFNAMES,
1002 Params: []string{dc.nick, channel, "End of /NAMES list"},
1003 })
1004 })
1005 return nil
1006 }
1007
1008 if ch.complete {
1009 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1010 }
1011 ch.complete = true
1012
1013 uc.forEachDownstream(func(dc *downstreamConn) {
1014 forwardChannel(dc, ch)
1015 })
1016 case irc.RPL_WHOREPLY:
1017 var channel, username, host, server, nick, mode, trailing string
1018 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1019 return err
1020 }
1021
1022 parts := strings.SplitN(trailing, " ", 2)
1023 if len(parts) != 2 {
1024 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1025 }
1026 realname := parts[1]
1027 hops, err := strconv.Atoi(parts[0])
1028 if err != nil {
1029 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1030 }
1031 hops++
1032
1033 trailing = strconv.Itoa(hops) + " " + realname
1034
1035 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1036 channel := channel
1037 if channel != "*" {
1038 channel = dc.marshalEntity(uc.network, channel)
1039 }
1040 nick := dc.marshalEntity(uc.network, nick)
1041 dc.SendMessage(&irc.Message{
1042 Prefix: dc.srv.prefix(),
1043 Command: irc.RPL_WHOREPLY,
1044 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1045 })
1046 })
1047 case irc.RPL_ENDOFWHO:
1048 var name string
1049 if err := parseMessageParams(msg, nil, &name); err != nil {
1050 return err
1051 }
1052
1053 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1054 name := name
1055 if name != "*" {
1056 // TODO: support WHO masks
1057 name = dc.marshalEntity(uc.network, name)
1058 }
1059 dc.SendMessage(&irc.Message{
1060 Prefix: dc.srv.prefix(),
1061 Command: irc.RPL_ENDOFWHO,
1062 Params: []string{dc.nick, name, "End of /WHO list"},
1063 })
1064 })
1065 case irc.RPL_WHOISUSER:
1066 var nick, username, host, realname string
1067 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1068 return err
1069 }
1070
1071 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1072 nick := dc.marshalEntity(uc.network, nick)
1073 dc.SendMessage(&irc.Message{
1074 Prefix: dc.srv.prefix(),
1075 Command: irc.RPL_WHOISUSER,
1076 Params: []string{dc.nick, nick, username, host, "*", realname},
1077 })
1078 })
1079 case irc.RPL_WHOISSERVER:
1080 var nick, server, serverInfo string
1081 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1082 return err
1083 }
1084
1085 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1086 nick := dc.marshalEntity(uc.network, nick)
1087 dc.SendMessage(&irc.Message{
1088 Prefix: dc.srv.prefix(),
1089 Command: irc.RPL_WHOISSERVER,
1090 Params: []string{dc.nick, nick, server, serverInfo},
1091 })
1092 })
1093 case irc.RPL_WHOISOPERATOR:
1094 var nick string
1095 if err := parseMessageParams(msg, nil, &nick); err != nil {
1096 return err
1097 }
1098
1099 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1100 nick := dc.marshalEntity(uc.network, nick)
1101 dc.SendMessage(&irc.Message{
1102 Prefix: dc.srv.prefix(),
1103 Command: irc.RPL_WHOISOPERATOR,
1104 Params: []string{dc.nick, nick, "is an IRC operator"},
1105 })
1106 })
1107 case irc.RPL_WHOISIDLE:
1108 var nick string
1109 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1110 return err
1111 }
1112
1113 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1114 nick := dc.marshalEntity(uc.network, nick)
1115 params := []string{dc.nick, nick}
1116 params = append(params, msg.Params[2:]...)
1117 dc.SendMessage(&irc.Message{
1118 Prefix: dc.srv.prefix(),
1119 Command: irc.RPL_WHOISIDLE,
1120 Params: params,
1121 })
1122 })
1123 case irc.RPL_WHOISCHANNELS:
1124 var nick, channelList string
1125 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1126 return err
1127 }
1128 channels := splitSpace(channelList)
1129
1130 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1131 nick := dc.marshalEntity(uc.network, nick)
1132 channelList := make([]string, len(channels))
1133 for i, channel := range channels {
1134 prefix, channel := uc.parseMembershipPrefix(channel)
1135 channel = dc.marshalEntity(uc.network, channel)
1136 channelList[i] = prefix.Format(dc) + channel
1137 }
1138 channels := strings.Join(channelList, " ")
1139 dc.SendMessage(&irc.Message{
1140 Prefix: dc.srv.prefix(),
1141 Command: irc.RPL_WHOISCHANNELS,
1142 Params: []string{dc.nick, nick, channels},
1143 })
1144 })
1145 case irc.RPL_ENDOFWHOIS:
1146 var nick string
1147 if err := parseMessageParams(msg, nil, &nick); err != nil {
1148 return err
1149 }
1150
1151 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1152 nick := dc.marshalEntity(uc.network, nick)
1153 dc.SendMessage(&irc.Message{
1154 Prefix: dc.srv.prefix(),
1155 Command: irc.RPL_ENDOFWHOIS,
1156 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1157 })
1158 })
1159 case "INVITE":
1160 var nick, channel string
1161 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1162 return err
1163 }
1164
1165 uc.forEachDownstream(func(dc *downstreamConn) {
1166 dc.SendMessage(&irc.Message{
1167 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1168 Command: "INVITE",
1169 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1170 })
1171 })
1172 case irc.RPL_INVITING:
1173 var nick, channel string
1174 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1175 return err
1176 }
1177
1178 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1179 dc.SendMessage(&irc.Message{
1180 Prefix: dc.srv.prefix(),
1181 Command: irc.RPL_INVITING,
1182 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1183 })
1184 })
1185 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1186 var command, reason string
1187 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1188 return err
1189 }
1190
1191 if command == "LIST" {
1192 ok := uc.endPendingLISTs(false)
1193 if !ok {
1194 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1195 }
1196 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1197 dc.SendMessage(&irc.Message{
1198 Prefix: uc.srv.prefix(),
1199 Command: msg.Command,
1200 Params: []string{dc.nick, "LIST", reason},
1201 })
1202 })
1203 }
1204 case irc.RPL_AWAY:
1205 var nick, reason string
1206 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1207 return err
1208 }
1209
1210 uc.forEachDownstream(func(dc *downstreamConn) {
1211 dc.SendMessage(&irc.Message{
1212 Prefix: dc.srv.prefix(),
1213 Command: irc.RPL_AWAY,
1214 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1215 })
1216 })
1217 case "AWAY":
1218 if msg.Prefix == nil {
1219 return fmt.Errorf("expected a prefix")
1220 }
1221
1222 uc.forEachDownstream(func(dc *downstreamConn) {
1223 if !dc.caps["away-notify"] {
1224 return
1225 }
1226 dc.SendMessage(&irc.Message{
1227 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1228 Command: "AWAY",
1229 Params: msg.Params,
1230 })
1231 })
1232 case "TAGMSG":
1233 // TODO: relay to downstream connections that accept message-tags
1234 case "ACK":
1235 // Ignore
1236 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1237 // Ignore
1238 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1239 // Ignore
1240 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1241 // Ignore
1242 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1243 // Ignore
1244 case irc.RPL_LISTSTART:
1245 // Ignore
1246 case rpl_localusers, rpl_globalusers:
1247 // Ignore
1248 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1249 // Ignore
1250 default:
1251 uc.logger.Printf("unhandled message: %v", msg)
1252 }
1253 return nil
1254}
1255
1256func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1257 caps := strings.Fields(capsStr)
1258 for _, s := range caps {
1259 kv := strings.SplitN(s, "=", 2)
1260 k := strings.ToLower(kv[0])
1261 var v string
1262 if len(kv) == 2 {
1263 v = kv[1]
1264 }
1265 uc.supportedCaps[k] = v
1266 }
1267}
1268
1269func (uc *upstreamConn) requestCaps() {
1270 var requestCaps []string
1271 for c := range permanentUpstreamCaps {
1272 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1273 requestCaps = append(requestCaps, c)
1274 }
1275 }
1276
1277 if uc.requestSASL() && !uc.caps["sasl"] {
1278 requestCaps = append(requestCaps, "sasl")
1279 }
1280
1281 if len(requestCaps) == 0 {
1282 return
1283 }
1284
1285 uc.SendMessage(&irc.Message{
1286 Command: "CAP",
1287 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1288 })
1289}
1290
1291func (uc *upstreamConn) requestSASL() bool {
1292 if uc.network.SASL.Mechanism == "" {
1293 return false
1294 }
1295
1296 v, ok := uc.supportedCaps["sasl"]
1297 if !ok {
1298 return false
1299 }
1300 if v != "" {
1301 mechanisms := strings.Split(v, ",")
1302 found := false
1303 for _, mech := range mechanisms {
1304 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1305 found = true
1306 break
1307 }
1308 }
1309 if !found {
1310 return false
1311 }
1312 }
1313
1314 return true
1315}
1316
1317func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1318 uc.caps[name] = ok
1319
1320 switch name {
1321 case "sasl":
1322 if !ok {
1323 uc.logger.Printf("server refused to acknowledge the SASL capability")
1324 return nil
1325 }
1326
1327 auth := &uc.network.SASL
1328 switch auth.Mechanism {
1329 case "PLAIN":
1330 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1331 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1332 default:
1333 return fmt.Errorf("unsupported SASL mechanism %q", name)
1334 }
1335
1336 uc.SendMessage(&irc.Message{
1337 Command: "AUTHENTICATE",
1338 Params: []string{auth.Mechanism},
1339 })
1340 default:
1341 if permanentUpstreamCaps[name] {
1342 break
1343 }
1344 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1345 }
1346 return nil
1347}
1348
1349func splitSpace(s string) []string {
1350 return strings.FieldsFunc(s, func(r rune) bool {
1351 return r == ' '
1352 })
1353}
1354
1355func (uc *upstreamConn) register() {
1356 uc.nick = uc.network.Nick
1357 uc.username = uc.network.Username
1358 if uc.username == "" {
1359 uc.username = uc.nick
1360 }
1361 uc.realname = uc.network.Realname
1362 if uc.realname == "" {
1363 uc.realname = uc.nick
1364 }
1365
1366 uc.SendMessage(&irc.Message{
1367 Command: "CAP",
1368 Params: []string{"LS", "302"},
1369 })
1370
1371 if uc.network.Pass != "" {
1372 uc.SendMessage(&irc.Message{
1373 Command: "PASS",
1374 Params: []string{uc.network.Pass},
1375 })
1376 }
1377
1378 uc.SendMessage(&irc.Message{
1379 Command: "NICK",
1380 Params: []string{uc.nick},
1381 })
1382 uc.SendMessage(&irc.Message{
1383 Command: "USER",
1384 Params: []string{uc.username, "0", "*", uc.realname},
1385 })
1386}
1387
1388func (uc *upstreamConn) runUntilRegistered() error {
1389 for !uc.registered {
1390 msg, err := uc.ReadMessage()
1391 if err != nil {
1392 return fmt.Errorf("failed to read message: %v", err)
1393 }
1394
1395 if err := uc.handleMessage(msg); err != nil {
1396 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1397 }
1398 }
1399
1400 for _, command := range uc.network.ConnectCommands {
1401 m, err := irc.ParseMessage(command)
1402 if err != nil {
1403 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1404 } else {
1405 uc.SendMessage(m)
1406 }
1407 }
1408
1409 return nil
1410}
1411
1412func (uc *upstreamConn) readMessages(ch chan<- event) error {
1413 for {
1414 msg, err := uc.ReadMessage()
1415 if err == io.EOF {
1416 break
1417 } else if err != nil {
1418 return fmt.Errorf("failed to read IRC command: %v", err)
1419 }
1420
1421 ch <- eventUpstreamMessage{msg, uc}
1422 }
1423
1424 return nil
1425}
1426
1427func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1428 if uc.caps["labeled-response"] {
1429 if msg.Tags == nil {
1430 msg.Tags = make(map[string]irc.TagValue)
1431 }
1432 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1433 uc.nextLabelID++
1434 }
1435 uc.SendMessage(msg)
1436}
1437
1438// TODO: handle moving logs when a network name changes, when support for this is added
1439func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) {
1440 if uc.srv.LogPath == "" {
1441 return
1442 }
1443
1444 ml, ok := uc.messageLoggers[entity]
1445 if !ok {
1446 ml = newMessageLogger(uc.network, entity)
1447 uc.messageLoggers[entity] = ml
1448 }
1449
1450 if err := ml.Append(msg); err != nil {
1451 uc.logger.Printf("failed to log message: %v", err)
1452 }
1453}
1454
1455// appendHistory appends a message to the history. entity can be empty.
1456func (uc *upstreamConn) appendHistory(entity string, msg *irc.Message) {
1457 detached := false
1458 if ch, ok := uc.network.channels[entity]; ok {
1459 detached = ch.Detached
1460 }
1461
1462 // If no client is offline, no need to append the message to the buffer
1463 if len(uc.network.offlineClients) == 0 && !detached {
1464 return
1465 }
1466
1467 history, ok := uc.network.history[entity]
1468 if !ok {
1469 history = &networkHistory{
1470 offlineClients: make(map[string]uint64),
1471 ring: NewRing(uc.srv.RingCap),
1472 }
1473 uc.network.history[entity] = history
1474
1475 for clientName, _ := range uc.network.offlineClients {
1476 history.offlineClients[clientName] = 0
1477 }
1478
1479 if detached {
1480 // If the channel is detached, online clients act as offline
1481 // clients too
1482 uc.forEachDownstream(func(dc *downstreamConn) {
1483 history.offlineClients[dc.clientName] = 0
1484 })
1485 }
1486 }
1487
1488 history.ring.Produce(msg)
1489}
1490
1491// produce appends a message to the logs, adds it to the history and forwards
1492// it to connected downstream connections.
1493//
1494// If origin is not nil and origin doesn't support echo-message, the message is
1495// forwarded to all connections except origin.
1496func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1497 if target != "" {
1498 uc.appendLog(target, msg)
1499 }
1500
1501 uc.appendHistory(target, msg)
1502
1503 // Don't forward messages if it's a detached channel
1504 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1505 return
1506 }
1507
1508 uc.forEachDownstream(func(dc *downstreamConn) {
1509 if dc != origin || dc.caps["echo-message"] {
1510 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1511 }
1512 })
1513}
1514
1515func (uc *upstreamConn) updateAway() {
1516 away := true
1517 uc.forEachDownstream(func(*downstreamConn) {
1518 away = false
1519 })
1520 if away == uc.away {
1521 return
1522 }
1523 if away {
1524 uc.SendMessage(&irc.Message{
1525 Command: "AWAY",
1526 Params: []string{"Auto away"},
1527 })
1528 } else {
1529 uc.SendMessage(&irc.Message{
1530 Command: "AWAY",
1531 })
1532 }
1533 uc.away = away
1534}
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