source: code/trunk/upstream.go@ 294

Last change on this file since 294 was 294, checked in by delthas, 5 years ago

Fix a null access due to assigning nil to the member memberships map

Even though the memberships map has type map[string]*memberships
(with memberships being defined as []membership), the default value for
that map should not be nil but a pointer to a nil slice.

This fixes a segfault on some servers before user channel prefixes are
sent.
File size: 37.7 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.saslClient == nil {
402 uc.SendMessage(&irc.Message{
403 Command: "CAP",
404 Params: []string{"END"},
405 })
406 }
407
408 if uc.registered {
409 uc.forEachDownstream(func(dc *downstreamConn) {
410 dc.updateSupportedCaps()
411 })
412 }
413 case "NEW":
414 if len(subParams) < 1 {
415 return newNeedMoreParamsError(msg.Command)
416 }
417 uc.handleSupportedCaps(subParams[0])
418 uc.requestCaps()
419 case "DEL":
420 if len(subParams) < 1 {
421 return newNeedMoreParamsError(msg.Command)
422 }
423 caps := strings.Fields(subParams[0])
424
425 for _, c := range caps {
426 delete(uc.supportedCaps, c)
427 delete(uc.caps, c)
428 }
429
430 if uc.registered {
431 uc.forEachDownstream(func(dc *downstreamConn) {
432 dc.updateSupportedCaps()
433 })
434 }
435 default:
436 uc.logger.Printf("unhandled message: %v", msg)
437 }
438 case "AUTHENTICATE":
439 if uc.saslClient == nil {
440 return fmt.Errorf("received unexpected AUTHENTICATE message")
441 }
442
443 // TODO: if a challenge is 400 bytes long, buffer it
444 var challengeStr string
445 if err := parseMessageParams(msg, &challengeStr); err != nil {
446 uc.SendMessage(&irc.Message{
447 Command: "AUTHENTICATE",
448 Params: []string{"*"},
449 })
450 return err
451 }
452
453 var challenge []byte
454 if challengeStr != "+" {
455 var err error
456 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
457 if err != nil {
458 uc.SendMessage(&irc.Message{
459 Command: "AUTHENTICATE",
460 Params: []string{"*"},
461 })
462 return err
463 }
464 }
465
466 var resp []byte
467 var err error
468 if !uc.saslStarted {
469 _, resp, err = uc.saslClient.Start()
470 uc.saslStarted = true
471 } else {
472 resp, err = uc.saslClient.Next(challenge)
473 }
474 if err != nil {
475 uc.SendMessage(&irc.Message{
476 Command: "AUTHENTICATE",
477 Params: []string{"*"},
478 })
479 return err
480 }
481
482 // TODO: send response in multiple chunks if >= 400 bytes
483 var respStr = "+"
484 if resp != nil {
485 respStr = base64.StdEncoding.EncodeToString(resp)
486 }
487
488 uc.SendMessage(&irc.Message{
489 Command: "AUTHENTICATE",
490 Params: []string{respStr},
491 })
492 case irc.RPL_LOGGEDIN:
493 var account string
494 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
495 return err
496 }
497 uc.logger.Printf("logged in with account %q", account)
498 case irc.RPL_LOGGEDOUT:
499 uc.logger.Printf("logged out")
500 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
501 var info string
502 if err := parseMessageParams(msg, nil, &info); err != nil {
503 return err
504 }
505 switch msg.Command {
506 case irc.ERR_NICKLOCKED:
507 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
508 case irc.ERR_SASLFAIL:
509 uc.logger.Printf("SASL authentication failed: %v", info)
510 case irc.ERR_SASLTOOLONG:
511 uc.logger.Printf("SASL message too long: %v", info)
512 }
513
514 uc.saslClient = nil
515 uc.saslStarted = false
516
517 uc.SendMessage(&irc.Message{
518 Command: "CAP",
519 Params: []string{"END"},
520 })
521 case irc.RPL_WELCOME:
522 uc.registered = true
523 uc.logger.Printf("connection registered")
524
525 uc.forEachDownstream(func(dc *downstreamConn) {
526 dc.updateSupportedCaps()
527 })
528
529 for _, ch := range uc.network.channels {
530 params := []string{ch.Name}
531 if ch.Key != "" {
532 params = append(params, ch.Key)
533 }
534 uc.SendMessage(&irc.Message{
535 Command: "JOIN",
536 Params: params,
537 })
538 }
539 case irc.RPL_MYINFO:
540 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
541 return err
542 }
543 case irc.RPL_ISUPPORT:
544 if err := parseMessageParams(msg, nil, nil); err != nil {
545 return err
546 }
547 for _, token := range msg.Params[1 : len(msg.Params)-1] {
548 negate := false
549 parameter := token
550 value := ""
551 if strings.HasPrefix(token, "-") {
552 negate = true
553 token = token[1:]
554 } else {
555 if i := strings.IndexByte(token, '='); i >= 0 {
556 parameter = token[:i]
557 value = token[i+1:]
558 }
559 }
560 if !negate {
561 switch parameter {
562 case "CHANMODES":
563 parts := strings.SplitN(value, ",", 5)
564 if len(parts) < 4 {
565 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
566 }
567 modes := make(map[byte]channelModeType)
568 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
569 for j := 0; j < len(parts[i]); j++ {
570 mode := parts[i][j]
571 modes[mode] = mt
572 }
573 }
574 uc.availableChannelModes = modes
575 case "CHANTYPES":
576 uc.availableChannelTypes = value
577 case "PREFIX":
578 if value == "" {
579 uc.availableMemberships = nil
580 } else {
581 if value[0] != '(' {
582 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
583 }
584 sep := strings.IndexByte(value, ')')
585 if sep < 0 || len(value) != sep*2 {
586 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
587 }
588 memberships := make([]membership, len(value)/2-1)
589 for i := range memberships {
590 memberships[i] = membership{
591 Mode: value[i+1],
592 Prefix: value[sep+i+1],
593 }
594 }
595 uc.availableMemberships = memberships
596 }
597 }
598 } else {
599 // TODO: handle ISUPPORT negations
600 }
601 }
602 case "BATCH":
603 var tag string
604 if err := parseMessageParams(msg, &tag); err != nil {
605 return err
606 }
607
608 if strings.HasPrefix(tag, "+") {
609 tag = tag[1:]
610 if _, ok := uc.batches[tag]; ok {
611 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
612 }
613 var batchType string
614 if err := parseMessageParams(msg, nil, &batchType); err != nil {
615 return err
616 }
617 label := label
618 if label == "" && msgBatch != nil {
619 label = msgBatch.Label
620 }
621 uc.batches[tag] = batch{
622 Type: batchType,
623 Params: msg.Params[2:],
624 Outer: msgBatch,
625 Label: label,
626 }
627 } else if strings.HasPrefix(tag, "-") {
628 tag = tag[1:]
629 if _, ok := uc.batches[tag]; !ok {
630 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
631 }
632 delete(uc.batches, tag)
633 } else {
634 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
635 }
636 case "NICK":
637 if msg.Prefix == nil {
638 return fmt.Errorf("expected a prefix")
639 }
640
641 var newNick string
642 if err := parseMessageParams(msg, &newNick); err != nil {
643 return err
644 }
645
646 me := false
647 if msg.Prefix.Name == uc.nick {
648 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
649 me = true
650 uc.nick = newNick
651 }
652
653 for _, ch := range uc.channels {
654 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
655 delete(ch.Members, msg.Prefix.Name)
656 ch.Members[newNick] = memberships
657 uc.appendLog(ch.Name, msg)
658 uc.appendHistory(ch.Name, msg)
659 }
660 }
661
662 if !me {
663 uc.forEachDownstream(func(dc *downstreamConn) {
664 dc.SendMessage(dc.marshalMessage(msg, uc.network))
665 })
666 }
667 case "JOIN":
668 if msg.Prefix == nil {
669 return fmt.Errorf("expected a prefix")
670 }
671
672 var channels string
673 if err := parseMessageParams(msg, &channels); err != nil {
674 return err
675 }
676
677 for _, ch := range strings.Split(channels, ",") {
678 if msg.Prefix.Name == uc.nick {
679 uc.logger.Printf("joined channel %q", ch)
680 uc.channels[ch] = &upstreamChannel{
681 Name: ch,
682 conn: uc,
683 Members: make(map[string]*memberships),
684 }
685
686 uc.SendMessage(&irc.Message{
687 Command: "MODE",
688 Params: []string{ch},
689 })
690 } else {
691 ch, err := uc.getChannel(ch)
692 if err != nil {
693 return err
694 }
695 ch.Members[msg.Prefix.Name] = &memberships{}
696 }
697
698 chMsg := msg.Copy()
699 chMsg.Params[0] = ch
700 uc.produce(ch, chMsg, nil)
701 }
702 case "PART":
703 if msg.Prefix == nil {
704 return fmt.Errorf("expected a prefix")
705 }
706
707 var channels string
708 if err := parseMessageParams(msg, &channels); err != nil {
709 return err
710 }
711
712 for _, ch := range strings.Split(channels, ",") {
713 if msg.Prefix.Name == uc.nick {
714 uc.logger.Printf("parted channel %q", ch)
715 delete(uc.channels, ch)
716 } else {
717 ch, err := uc.getChannel(ch)
718 if err != nil {
719 return err
720 }
721 delete(ch.Members, msg.Prefix.Name)
722 }
723
724 chMsg := msg.Copy()
725 chMsg.Params[0] = ch
726 uc.produce(ch, chMsg, nil)
727 }
728 case "KICK":
729 if msg.Prefix == nil {
730 return fmt.Errorf("expected a prefix")
731 }
732
733 var channel, user string
734 if err := parseMessageParams(msg, &channel, &user); err != nil {
735 return err
736 }
737
738 if user == uc.nick {
739 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
740 delete(uc.channels, channel)
741 } else {
742 ch, err := uc.getChannel(channel)
743 if err != nil {
744 return err
745 }
746 delete(ch.Members, user)
747 }
748
749 uc.produce(channel, msg, nil)
750 case "QUIT":
751 if msg.Prefix == nil {
752 return fmt.Errorf("expected a prefix")
753 }
754
755 if msg.Prefix.Name == uc.nick {
756 uc.logger.Printf("quit")
757 }
758
759 for _, ch := range uc.channels {
760 if _, ok := ch.Members[msg.Prefix.Name]; ok {
761 delete(ch.Members, msg.Prefix.Name)
762
763 uc.appendLog(ch.Name, msg)
764 uc.appendHistory(ch.Name, msg)
765 }
766 }
767
768 if msg.Prefix.Name != uc.nick {
769 uc.forEachDownstream(func(dc *downstreamConn) {
770 dc.SendMessage(dc.marshalMessage(msg, uc.network))
771 })
772 }
773 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
774 var name, topic string
775 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
776 return err
777 }
778 ch, err := uc.getChannel(name)
779 if err != nil {
780 return err
781 }
782 if msg.Command == irc.RPL_TOPIC {
783 ch.Topic = topic
784 } else {
785 ch.Topic = ""
786 }
787 case "TOPIC":
788 var name string
789 if err := parseMessageParams(msg, &name); err != nil {
790 return err
791 }
792 ch, err := uc.getChannel(name)
793 if err != nil {
794 return err
795 }
796 if len(msg.Params) > 1 {
797 ch.Topic = msg.Params[1]
798 } else {
799 ch.Topic = ""
800 }
801 uc.produce(ch.Name, msg, nil)
802 case "MODE":
803 var name, modeStr string
804 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
805 return err
806 }
807
808 if !uc.isChannel(name) { // user mode change
809 if name != uc.nick {
810 return fmt.Errorf("received MODE message for unknown nick %q", name)
811 }
812 return uc.modes.Apply(modeStr)
813 // TODO: notify downstreams about user mode change?
814 } else { // channel mode change
815 ch, err := uc.getChannel(name)
816 if err != nil {
817 return err
818 }
819
820 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
821 if err != nil {
822 return err
823 }
824
825 uc.appendLog(ch.Name, msg)
826 uc.forEachDownstream(func(dc *downstreamConn) {
827 params := make([]string, len(msg.Params))
828 params[0] = dc.marshalEntity(uc.network, name)
829 params[1] = modeStr
830
831 copy(params[2:], msg.Params[2:])
832 for i, modeParam := range params[2:] {
833 if _, ok := needMarshaling[i]; ok {
834 params[2+i] = dc.marshalEntity(uc.network, modeParam)
835 }
836 }
837
838 dc.SendMessage(&irc.Message{
839 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
840 Command: "MODE",
841 Params: params,
842 })
843 })
844 }
845 case irc.RPL_UMODEIS:
846 if err := parseMessageParams(msg, nil); err != nil {
847 return err
848 }
849 modeStr := ""
850 if len(msg.Params) > 1 {
851 modeStr = msg.Params[1]
852 }
853
854 uc.modes = ""
855 if err := uc.modes.Apply(modeStr); err != nil {
856 return err
857 }
858 // TODO: send RPL_UMODEIS to downstream connections when applicable
859 case irc.RPL_CHANNELMODEIS:
860 var channel string
861 if err := parseMessageParams(msg, nil, &channel); err != nil {
862 return err
863 }
864 modeStr := ""
865 if len(msg.Params) > 2 {
866 modeStr = msg.Params[2]
867 }
868
869 ch, err := uc.getChannel(channel)
870 if err != nil {
871 return err
872 }
873
874 firstMode := ch.modes == nil
875 ch.modes = make(map[byte]string)
876 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
877 return err
878 }
879 if firstMode {
880 modeStr, modeParams := ch.modes.Format()
881
882 uc.forEachDownstream(func(dc *downstreamConn) {
883 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
884 params = append(params, modeParams...)
885
886 dc.SendMessage(&irc.Message{
887 Prefix: dc.srv.prefix(),
888 Command: irc.RPL_CHANNELMODEIS,
889 Params: params,
890 })
891 })
892 }
893 case rpl_creationtime:
894 var channel, creationTime string
895 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
896 return err
897 }
898
899 ch, err := uc.getChannel(channel)
900 if err != nil {
901 return err
902 }
903
904 firstCreationTime := ch.creationTime == ""
905 ch.creationTime = creationTime
906 if firstCreationTime {
907 uc.forEachDownstream(func(dc *downstreamConn) {
908 dc.SendMessage(&irc.Message{
909 Prefix: dc.srv.prefix(),
910 Command: rpl_creationtime,
911 Params: []string{dc.nick, channel, creationTime},
912 })
913 })
914 }
915 case rpl_topicwhotime:
916 var name, who, timeStr string
917 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
918 return err
919 }
920 ch, err := uc.getChannel(name)
921 if err != nil {
922 return err
923 }
924 ch.TopicWho = who
925 sec, err := strconv.ParseInt(timeStr, 10, 64)
926 if err != nil {
927 return fmt.Errorf("failed to parse topic time: %v", err)
928 }
929 ch.TopicTime = time.Unix(sec, 0)
930 case irc.RPL_LIST:
931 var channel, clients, topic string
932 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
933 return err
934 }
935
936 pl := uc.getPendingLIST()
937 if pl == nil {
938 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
939 }
940
941 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
942 dc.SendMessage(&irc.Message{
943 Prefix: dc.srv.prefix(),
944 Command: irc.RPL_LIST,
945 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
946 })
947 })
948 case irc.RPL_LISTEND:
949 ok := uc.endPendingLISTs(false)
950 if !ok {
951 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
952 }
953 case irc.RPL_NAMREPLY:
954 var name, statusStr, members string
955 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
956 return err
957 }
958
959 ch, ok := uc.channels[name]
960 if !ok {
961 // NAMES on a channel we have not joined, forward to downstream
962 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
963 channel := dc.marshalEntity(uc.network, name)
964 members := splitSpace(members)
965 for i, member := range members {
966 memberships, nick := uc.parseMembershipPrefix(member)
967 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
968 }
969 memberStr := strings.Join(members, " ")
970
971 dc.SendMessage(&irc.Message{
972 Prefix: dc.srv.prefix(),
973 Command: irc.RPL_NAMREPLY,
974 Params: []string{dc.nick, statusStr, channel, memberStr},
975 })
976 })
977 return nil
978 }
979
980 status, err := parseChannelStatus(statusStr)
981 if err != nil {
982 return err
983 }
984 ch.Status = status
985
986 for _, s := range splitSpace(members) {
987 memberships, nick := uc.parseMembershipPrefix(s)
988 ch.Members[nick] = memberships
989 }
990 case irc.RPL_ENDOFNAMES:
991 var name string
992 if err := parseMessageParams(msg, nil, &name); err != nil {
993 return err
994 }
995
996 ch, ok := uc.channels[name]
997 if !ok {
998 // NAMES on a channel we have not joined, forward to downstream
999 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1000 channel := dc.marshalEntity(uc.network, name)
1001
1002 dc.SendMessage(&irc.Message{
1003 Prefix: dc.srv.prefix(),
1004 Command: irc.RPL_ENDOFNAMES,
1005 Params: []string{dc.nick, channel, "End of /NAMES list"},
1006 })
1007 })
1008 return nil
1009 }
1010
1011 if ch.complete {
1012 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1013 }
1014 ch.complete = true
1015
1016 uc.forEachDownstream(func(dc *downstreamConn) {
1017 forwardChannel(dc, ch)
1018 })
1019 case irc.RPL_WHOREPLY:
1020 var channel, username, host, server, nick, mode, trailing string
1021 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1022 return err
1023 }
1024
1025 parts := strings.SplitN(trailing, " ", 2)
1026 if len(parts) != 2 {
1027 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1028 }
1029 realname := parts[1]
1030 hops, err := strconv.Atoi(parts[0])
1031 if err != nil {
1032 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1033 }
1034 hops++
1035
1036 trailing = strconv.Itoa(hops) + " " + realname
1037
1038 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1039 channel := channel
1040 if channel != "*" {
1041 channel = dc.marshalEntity(uc.network, channel)
1042 }
1043 nick := dc.marshalEntity(uc.network, nick)
1044 dc.SendMessage(&irc.Message{
1045 Prefix: dc.srv.prefix(),
1046 Command: irc.RPL_WHOREPLY,
1047 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1048 })
1049 })
1050 case irc.RPL_ENDOFWHO:
1051 var name string
1052 if err := parseMessageParams(msg, nil, &name); err != nil {
1053 return err
1054 }
1055
1056 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1057 name := name
1058 if name != "*" {
1059 // TODO: support WHO masks
1060 name = dc.marshalEntity(uc.network, name)
1061 }
1062 dc.SendMessage(&irc.Message{
1063 Prefix: dc.srv.prefix(),
1064 Command: irc.RPL_ENDOFWHO,
1065 Params: []string{dc.nick, name, "End of /WHO list"},
1066 })
1067 })
1068 case irc.RPL_WHOISUSER:
1069 var nick, username, host, realname string
1070 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1071 return err
1072 }
1073
1074 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1075 nick := dc.marshalEntity(uc.network, nick)
1076 dc.SendMessage(&irc.Message{
1077 Prefix: dc.srv.prefix(),
1078 Command: irc.RPL_WHOISUSER,
1079 Params: []string{dc.nick, nick, username, host, "*", realname},
1080 })
1081 })
1082 case irc.RPL_WHOISSERVER:
1083 var nick, server, serverInfo string
1084 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1085 return err
1086 }
1087
1088 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1089 nick := dc.marshalEntity(uc.network, nick)
1090 dc.SendMessage(&irc.Message{
1091 Prefix: dc.srv.prefix(),
1092 Command: irc.RPL_WHOISSERVER,
1093 Params: []string{dc.nick, nick, server, serverInfo},
1094 })
1095 })
1096 case irc.RPL_WHOISOPERATOR:
1097 var nick string
1098 if err := parseMessageParams(msg, nil, &nick); err != nil {
1099 return err
1100 }
1101
1102 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1103 nick := dc.marshalEntity(uc.network, nick)
1104 dc.SendMessage(&irc.Message{
1105 Prefix: dc.srv.prefix(),
1106 Command: irc.RPL_WHOISOPERATOR,
1107 Params: []string{dc.nick, nick, "is an IRC operator"},
1108 })
1109 })
1110 case irc.RPL_WHOISIDLE:
1111 var nick string
1112 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1113 return err
1114 }
1115
1116 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1117 nick := dc.marshalEntity(uc.network, nick)
1118 params := []string{dc.nick, nick}
1119 params = append(params, msg.Params[2:]...)
1120 dc.SendMessage(&irc.Message{
1121 Prefix: dc.srv.prefix(),
1122 Command: irc.RPL_WHOISIDLE,
1123 Params: params,
1124 })
1125 })
1126 case irc.RPL_WHOISCHANNELS:
1127 var nick, channelList string
1128 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1129 return err
1130 }
1131 channels := splitSpace(channelList)
1132
1133 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1134 nick := dc.marshalEntity(uc.network, nick)
1135 channelList := make([]string, len(channels))
1136 for i, channel := range channels {
1137 prefix, channel := uc.parseMembershipPrefix(channel)
1138 channel = dc.marshalEntity(uc.network, channel)
1139 channelList[i] = prefix.Format(dc) + channel
1140 }
1141 channels := strings.Join(channelList, " ")
1142 dc.SendMessage(&irc.Message{
1143 Prefix: dc.srv.prefix(),
1144 Command: irc.RPL_WHOISCHANNELS,
1145 Params: []string{dc.nick, nick, channels},
1146 })
1147 })
1148 case irc.RPL_ENDOFWHOIS:
1149 var nick string
1150 if err := parseMessageParams(msg, nil, &nick); err != nil {
1151 return err
1152 }
1153
1154 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1155 nick := dc.marshalEntity(uc.network, nick)
1156 dc.SendMessage(&irc.Message{
1157 Prefix: dc.srv.prefix(),
1158 Command: irc.RPL_ENDOFWHOIS,
1159 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1160 })
1161 })
1162 case "INVITE":
1163 var nick, channel string
1164 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1165 return err
1166 }
1167
1168 uc.forEachDownstream(func(dc *downstreamConn) {
1169 dc.SendMessage(&irc.Message{
1170 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1171 Command: "INVITE",
1172 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1173 })
1174 })
1175 case irc.RPL_INVITING:
1176 var nick, channel string
1177 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1178 return err
1179 }
1180
1181 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1182 dc.SendMessage(&irc.Message{
1183 Prefix: dc.srv.prefix(),
1184 Command: irc.RPL_INVITING,
1185 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1186 })
1187 })
1188 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1189 var command, reason string
1190 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1191 return err
1192 }
1193
1194 if command == "LIST" {
1195 ok := uc.endPendingLISTs(false)
1196 if !ok {
1197 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1198 }
1199 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1200 dc.SendMessage(&irc.Message{
1201 Prefix: uc.srv.prefix(),
1202 Command: msg.Command,
1203 Params: []string{dc.nick, "LIST", reason},
1204 })
1205 })
1206 }
1207 case irc.RPL_AWAY:
1208 var nick, reason string
1209 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1210 return err
1211 }
1212
1213 uc.forEachDownstream(func(dc *downstreamConn) {
1214 dc.SendMessage(&irc.Message{
1215 Prefix: dc.srv.prefix(),
1216 Command: irc.RPL_AWAY,
1217 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1218 })
1219 })
1220 case "AWAY":
1221 if msg.Prefix == nil {
1222 return fmt.Errorf("expected a prefix")
1223 }
1224
1225 uc.forEachDownstream(func(dc *downstreamConn) {
1226 if !dc.caps["away-notify"] {
1227 return
1228 }
1229 dc.SendMessage(&irc.Message{
1230 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1231 Command: "AWAY",
1232 Params: msg.Params,
1233 })
1234 })
1235 case "TAGMSG":
1236 // TODO: relay to downstream connections that accept message-tags
1237 case "ACK":
1238 // Ignore
1239 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1240 // Ignore
1241 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1242 // Ignore
1243 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1244 // Ignore
1245 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1246 // Ignore
1247 case irc.RPL_LISTSTART:
1248 // Ignore
1249 case rpl_localusers, rpl_globalusers:
1250 // Ignore
1251 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1252 // Ignore
1253 default:
1254 uc.logger.Printf("unhandled message: %v", msg)
1255 }
1256 return nil
1257}
1258
1259func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1260 caps := strings.Fields(capsStr)
1261 for _, s := range caps {
1262 kv := strings.SplitN(s, "=", 2)
1263 k := strings.ToLower(kv[0])
1264 var v string
1265 if len(kv) == 2 {
1266 v = kv[1]
1267 }
1268 uc.supportedCaps[k] = v
1269 }
1270}
1271
1272func (uc *upstreamConn) requestCaps() {
1273 var requestCaps []string
1274 for c := range permanentUpstreamCaps {
1275 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1276 requestCaps = append(requestCaps, c)
1277 }
1278 }
1279
1280 if uc.requestSASL() && !uc.caps["sasl"] {
1281 requestCaps = append(requestCaps, "sasl")
1282 }
1283
1284 if len(requestCaps) == 0 {
1285 return
1286 }
1287
1288 uc.SendMessage(&irc.Message{
1289 Command: "CAP",
1290 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1291 })
1292}
1293
1294func (uc *upstreamConn) requestSASL() bool {
1295 if uc.network.SASL.Mechanism == "" {
1296 return false
1297 }
1298
1299 v, ok := uc.supportedCaps["sasl"]
1300 if !ok {
1301 return false
1302 }
1303 if v != "" {
1304 mechanisms := strings.Split(v, ",")
1305 found := false
1306 for _, mech := range mechanisms {
1307 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1308 found = true
1309 break
1310 }
1311 }
1312 if !found {
1313 return false
1314 }
1315 }
1316
1317 return true
1318}
1319
1320func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1321 uc.caps[name] = ok
1322
1323 switch name {
1324 case "sasl":
1325 if !ok {
1326 uc.logger.Printf("server refused to acknowledge the SASL capability")
1327 return nil
1328 }
1329
1330 auth := &uc.network.SASL
1331 switch auth.Mechanism {
1332 case "PLAIN":
1333 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1334 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1335 default:
1336 return fmt.Errorf("unsupported SASL mechanism %q", name)
1337 }
1338
1339 uc.SendMessage(&irc.Message{
1340 Command: "AUTHENTICATE",
1341 Params: []string{auth.Mechanism},
1342 })
1343 default:
1344 if permanentUpstreamCaps[name] {
1345 break
1346 }
1347 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1348 }
1349 return nil
1350}
1351
1352func splitSpace(s string) []string {
1353 return strings.FieldsFunc(s, func(r rune) bool {
1354 return r == ' '
1355 })
1356}
1357
1358func (uc *upstreamConn) register() {
1359 uc.nick = uc.network.Nick
1360 uc.username = uc.network.Username
1361 if uc.username == "" {
1362 uc.username = uc.nick
1363 }
1364 uc.realname = uc.network.Realname
1365 if uc.realname == "" {
1366 uc.realname = uc.nick
1367 }
1368
1369 uc.SendMessage(&irc.Message{
1370 Command: "CAP",
1371 Params: []string{"LS", "302"},
1372 })
1373
1374 if uc.network.Pass != "" {
1375 uc.SendMessage(&irc.Message{
1376 Command: "PASS",
1377 Params: []string{uc.network.Pass},
1378 })
1379 }
1380
1381 uc.SendMessage(&irc.Message{
1382 Command: "NICK",
1383 Params: []string{uc.nick},
1384 })
1385 uc.SendMessage(&irc.Message{
1386 Command: "USER",
1387 Params: []string{uc.username, "0", "*", uc.realname},
1388 })
1389}
1390
1391func (uc *upstreamConn) runUntilRegistered() error {
1392 for !uc.registered {
1393 msg, err := uc.ReadMessage()
1394 if err != nil {
1395 return fmt.Errorf("failed to read message: %v", err)
1396 }
1397
1398 if err := uc.handleMessage(msg); err != nil {
1399 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1400 }
1401 }
1402
1403 for _, command := range uc.network.ConnectCommands {
1404 m, err := irc.ParseMessage(command)
1405 if err != nil {
1406 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1407 } else {
1408 uc.SendMessage(m)
1409 }
1410 }
1411
1412 return nil
1413}
1414
1415func (uc *upstreamConn) readMessages(ch chan<- event) error {
1416 for {
1417 msg, err := uc.ReadMessage()
1418 if err == io.EOF {
1419 break
1420 } else if err != nil {
1421 return fmt.Errorf("failed to read IRC command: %v", err)
1422 }
1423
1424 ch <- eventUpstreamMessage{msg, uc}
1425 }
1426
1427 return nil
1428}
1429
1430func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1431 if uc.caps["labeled-response"] {
1432 if msg.Tags == nil {
1433 msg.Tags = make(map[string]irc.TagValue)
1434 }
1435 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1436 uc.nextLabelID++
1437 }
1438 uc.SendMessage(msg)
1439}
1440
1441// TODO: handle moving logs when a network name changes, when support for this is added
1442func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) {
1443 if uc.srv.LogPath == "" {
1444 return
1445 }
1446
1447 ml, ok := uc.messageLoggers[entity]
1448 if !ok {
1449 ml = newMessageLogger(uc.network, entity)
1450 uc.messageLoggers[entity] = ml
1451 }
1452
1453 if err := ml.Append(msg); err != nil {
1454 uc.logger.Printf("failed to log message: %v", err)
1455 }
1456}
1457
1458// appendHistory appends a message to the history. entity can be empty.
1459func (uc *upstreamConn) appendHistory(entity string, msg *irc.Message) {
1460 detached := false
1461 if ch, ok := uc.network.channels[entity]; ok {
1462 detached = ch.Detached
1463 }
1464
1465 // If no client is offline, no need to append the message to the buffer
1466 if len(uc.network.offlineClients) == 0 && !detached {
1467 return
1468 }
1469
1470 history, ok := uc.network.history[entity]
1471 if !ok {
1472 history = &networkHistory{
1473 offlineClients: make(map[string]uint64),
1474 ring: NewRing(uc.srv.RingCap),
1475 }
1476 uc.network.history[entity] = history
1477
1478 for clientName, _ := range uc.network.offlineClients {
1479 history.offlineClients[clientName] = 0
1480 }
1481
1482 if detached {
1483 // If the channel is detached, online clients act as offline
1484 // clients too
1485 uc.forEachDownstream(func(dc *downstreamConn) {
1486 history.offlineClients[dc.clientName] = 0
1487 })
1488 }
1489 }
1490
1491 history.ring.Produce(msg)
1492}
1493
1494// produce appends a message to the logs, adds it to the history and forwards
1495// it to connected downstream connections.
1496//
1497// If origin is not nil and origin doesn't support echo-message, the message is
1498// forwarded to all connections except origin.
1499func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1500 if target != "" {
1501 uc.appendLog(target, msg)
1502 }
1503
1504 uc.appendHistory(target, msg)
1505
1506 // Don't forward messages if it's a detached channel
1507 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1508 return
1509 }
1510
1511 uc.forEachDownstream(func(dc *downstreamConn) {
1512 if dc != origin || dc.caps["echo-message"] {
1513 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1514 }
1515 })
1516}
1517
1518func (uc *upstreamConn) updateAway() {
1519 away := true
1520 uc.forEachDownstream(func(*downstreamConn) {
1521 away = false
1522 })
1523 if away == uc.away {
1524 return
1525 }
1526 if away {
1527 uc.SendMessage(&irc.Message{
1528 Command: "AWAY",
1529 Params: []string{"Auto away"},
1530 })
1531 } else {
1532 uc.SendMessage(&irc.Message{
1533 Command: "AWAY",
1534 })
1535 }
1536 uc.away = away
1537}
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