source: code/trunk/upstream.go@ 458

Last change on this file since 458 was 458, checked in by contact, 4 years ago

Extract ISUPPORT CHANMODES/PREFIX to separate functions
File size: 44.3 KB
Line 
1package soju
2
3import (
4 "crypto"
5 "crypto/sha256"
6 "crypto/tls"
7 "crypto/x509"
8 "encoding/base64"
9 "errors"
10 "fmt"
11 "io"
12 "net"
13 "strconv"
14 "strings"
15 "time"
16 "unicode"
17 "unicode/utf8"
18
19 "github.com/emersion/go-sasl"
20 "gopkg.in/irc.v3"
21)
22
23// permanentUpstreamCaps is the static list of upstream capabilities always
24// requested when supported.
25var permanentUpstreamCaps = map[string]bool{
26 "away-notify": true,
27 "batch": true,
28 "extended-join": true,
29 "invite-notify": true,
30 "labeled-response": true,
31 "message-tags": true,
32 "multi-prefix": true,
33 "server-time": true,
34}
35
36type registrationError string
37
38func (err registrationError) Error() string {
39 return fmt.Sprintf("registration error: %v", string(err))
40}
41
42type upstreamChannel struct {
43 Name string
44 conn *upstreamConn
45 Topic string
46 TopicWho *irc.Prefix
47 TopicTime time.Time
48 Status channelStatus
49 modes channelModes
50 creationTime string
51 Members map[string]*memberships
52 complete bool
53 detachTimer *time.Timer
54}
55
56func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
57 if uc.detachTimer != nil {
58 uc.detachTimer.Stop()
59 uc.detachTimer = nil
60 }
61
62 if dur == 0 {
63 return
64 }
65
66 uc.detachTimer = time.AfterFunc(dur, func() {
67 uc.conn.network.user.events <- eventChannelDetach{
68 uc: uc.conn,
69 name: uc.Name,
70 }
71 })
72}
73
74type upstreamConn struct {
75 conn
76
77 network *network
78 user *user
79
80 serverName string
81 networkName string
82 availableUserModes string
83 availableChannelModes map[byte]channelModeType
84 availableChannelTypes string
85 availableMemberships []membership
86
87 registered bool
88 nick string
89 username string
90 realname string
91 modes userModes
92 channels map[string]*upstreamChannel
93 supportedCaps map[string]string
94 caps map[string]bool
95 batches map[string]batch
96 away bool
97 nextLabelID uint64
98
99 saslClient sasl.Client
100 saslStarted bool
101
102 // set of LIST commands in progress, per downstream
103 pendingLISTDownstreamSet map[uint64]struct{}
104}
105
106func connectToUpstream(network *network) (*upstreamConn, error) {
107 logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
108
109 dialer := net.Dialer{Timeout: connectTimeout}
110
111 u, err := network.URL()
112 if err != nil {
113 return nil, err
114 }
115
116 var netConn net.Conn
117 switch u.Scheme {
118 case "ircs":
119 addr := u.Host
120 host, _, err := net.SplitHostPort(u.Host)
121 if err != nil {
122 host = u.Host
123 addr = u.Host + ":6697"
124 }
125
126 logger.Printf("connecting to TLS server at address %q", addr)
127
128 tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
129 if network.SASL.Mechanism == "EXTERNAL" {
130 if network.SASL.External.CertBlob == nil {
131 return nil, fmt.Errorf("missing certificate for authentication")
132 }
133 if network.SASL.External.PrivKeyBlob == nil {
134 return nil, fmt.Errorf("missing private key for authentication")
135 }
136 key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
137 if err != nil {
138 return nil, fmt.Errorf("failed to parse private key: %v", err)
139 }
140 tlsConfig.Certificates = []tls.Certificate{
141 {
142 Certificate: [][]byte{network.SASL.External.CertBlob},
143 PrivateKey: key.(crypto.PrivateKey),
144 },
145 }
146 logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
147 }
148
149 netConn, err = dialer.Dial("tcp", addr)
150 if err != nil {
151 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
152 }
153
154 // Don't do the TLS handshake immediately, because we need to register
155 // the new connection with identd ASAP. See:
156 // https://todo.sr.ht/~emersion/soju/69#event-41859
157 netConn = tls.Client(netConn, tlsConfig)
158 case "irc+insecure":
159 addr := u.Host
160 if _, _, err := net.SplitHostPort(addr); err != nil {
161 addr = addr + ":6667"
162 }
163
164 logger.Printf("connecting to plain-text server at address %q", addr)
165 netConn, err = dialer.Dial("tcp", addr)
166 if err != nil {
167 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
168 }
169 case "irc+unix", "unix":
170 logger.Printf("connecting to Unix socket at path %q", u.Path)
171 netConn, err = dialer.Dial("unix", u.Path)
172 if err != nil {
173 return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
174 }
175 default:
176 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
177 }
178
179 options := connOptions{
180 Logger: logger,
181 RateLimitDelay: upstreamMessageDelay,
182 RateLimitBurst: upstreamMessageBurst,
183 }
184
185 uc := &upstreamConn{
186 conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
187 network: network,
188 user: network.user,
189 channels: make(map[string]*upstreamChannel),
190 supportedCaps: make(map[string]string),
191 caps: make(map[string]bool),
192 batches: make(map[string]batch),
193 availableChannelTypes: stdChannelTypes,
194 availableChannelModes: stdChannelModes,
195 availableMemberships: stdMemberships,
196 pendingLISTDownstreamSet: make(map[uint64]struct{}),
197 }
198 return uc, nil
199}
200
201func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
202 uc.network.forEachDownstream(f)
203}
204
205func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
206 uc.forEachDownstream(func(dc *downstreamConn) {
207 if id != 0 && id != dc.id {
208 return
209 }
210 f(dc)
211 })
212}
213
214func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
215 ch, ok := uc.channels[name]
216 if !ok {
217 return nil, fmt.Errorf("unknown channel %q", name)
218 }
219 return ch, nil
220}
221
222func (uc *upstreamConn) isChannel(entity string) bool {
223 return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
224}
225
226func (uc *upstreamConn) getPendingLIST() *pendingLIST {
227 for _, pl := range uc.user.pendingLISTs {
228 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
229 continue
230 }
231 return &pl
232 }
233 return nil
234}
235
236func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
237 found = false
238 for i := 0; i < len(uc.user.pendingLISTs); i++ {
239 pl := uc.user.pendingLISTs[i]
240 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
241 continue
242 }
243 delete(pl.pendingCommands, uc.network.ID)
244 if len(pl.pendingCommands) == 0 {
245 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
246 i--
247 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
248 dc.SendMessage(&irc.Message{
249 Prefix: dc.srv.prefix(),
250 Command: irc.RPL_LISTEND,
251 Params: []string{dc.nick, "End of /LIST"},
252 })
253 })
254 }
255 found = true
256 if !all {
257 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
258 uc.user.forEachUpstream(func(uc *upstreamConn) {
259 uc.trySendLIST(pl.downstreamID)
260 })
261 return
262 }
263 }
264 return
265}
266
267func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
268 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
269 // a LIST command is already pending
270 // we will try again when that command is completed
271 return
272 }
273
274 for _, pl := range uc.user.pendingLISTs {
275 if pl.downstreamID != downstreamID {
276 continue
277 }
278 // this is the first pending LIST command list of the downstream
279 listCommand, ok := pl.pendingCommands[uc.network.ID]
280 if !ok {
281 // there is no command for this upstream in these LIST commands
282 // do not send anything
283 continue
284 }
285 // there is a command for this upstream in these LIST commands
286 // send it now
287
288 uc.SendMessageLabeled(downstreamID, listCommand)
289
290 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
291 return
292 }
293}
294
295func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
296 memberships := make(memberships, 0, 4)
297 i := 0
298 for _, m := range uc.availableMemberships {
299 if i >= len(s) {
300 break
301 }
302 if s[i] == m.Prefix {
303 memberships = append(memberships, m)
304 i++
305 }
306 }
307 return &memberships, s[i:]
308}
309
310func isWordBoundary(r rune) bool {
311 switch r {
312 case '-', '_', '|':
313 return false
314 case '\u00A0':
315 return true
316 default:
317 return !unicode.IsLetter(r) && !unicode.IsNumber(r)
318 }
319}
320
321func isHighlight(text, nick string) bool {
322 for {
323 i := strings.Index(text, nick)
324 if i < 0 {
325 return false
326 }
327
328 // Detect word boundaries
329 var left, right rune
330 if i > 0 {
331 left, _ = utf8.DecodeLastRuneInString(text[:i])
332 }
333 if i < len(text) {
334 right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
335 }
336 if isWordBoundary(left) && isWordBoundary(right) {
337 return true
338 }
339
340 text = text[i+len(nick):]
341 }
342}
343
344func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
345 var label string
346 if l, ok := msg.GetTag("label"); ok {
347 label = l
348 }
349
350 var msgBatch *batch
351 if batchName, ok := msg.GetTag("batch"); ok {
352 b, ok := uc.batches[batchName]
353 if !ok {
354 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
355 }
356 msgBatch = &b
357 if label == "" {
358 label = msgBatch.Label
359 }
360 delete(msg.Tags, "batch")
361 }
362
363 var downstreamID uint64 = 0
364 if label != "" {
365 var labelOffset uint64
366 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
367 if err == nil && n < 2 {
368 err = errors.New("not enough arguments")
369 }
370 if err != nil {
371 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
372 }
373 }
374
375 if _, ok := msg.Tags["time"]; !ok {
376 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
377 }
378
379 switch msg.Command {
380 case "PING":
381 uc.SendMessage(&irc.Message{
382 Command: "PONG",
383 Params: msg.Params,
384 })
385 return nil
386 case "NOTICE", "PRIVMSG", "TAGMSG":
387 if msg.Prefix == nil {
388 return fmt.Errorf("expected a prefix")
389 }
390
391 var entity, text string
392 if msg.Command != "TAGMSG" {
393 if err := parseMessageParams(msg, &entity, &text); err != nil {
394 return err
395 }
396 } else {
397 if err := parseMessageParams(msg, &entity); err != nil {
398 return err
399 }
400 }
401
402 if msg.Prefix.Name == serviceNick {
403 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
404 break
405 }
406 if entity == serviceNick {
407 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
408 break
409 }
410
411 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
412 uc.produce("", msg, nil)
413 } else { // regular user message
414 target := entity
415 if target == uc.nick {
416 target = msg.Prefix.Name
417 }
418
419 if ch, ok := uc.network.channels[target]; ok {
420 if ch.Detached {
421 uc.handleDetachedMessage(msg.Prefix.Name, text, ch)
422 }
423
424 highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
425 if ch.DetachOn == FilterMessage || ch.DetachOn == FilterDefault || (ch.DetachOn == FilterHighlight && highlight) {
426 uc.updateChannelAutoDetach(target)
427 }
428 }
429
430 uc.produce(target, msg, nil)
431 }
432 case "CAP":
433 var subCmd string
434 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
435 return err
436 }
437 subCmd = strings.ToUpper(subCmd)
438 subParams := msg.Params[2:]
439 switch subCmd {
440 case "LS":
441 if len(subParams) < 1 {
442 return newNeedMoreParamsError(msg.Command)
443 }
444 caps := subParams[len(subParams)-1]
445 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
446
447 uc.handleSupportedCaps(caps)
448
449 if more {
450 break // wait to receive all capabilities
451 }
452
453 uc.requestCaps()
454
455 if uc.requestSASL() {
456 break // we'll send CAP END after authentication is completed
457 }
458
459 uc.SendMessage(&irc.Message{
460 Command: "CAP",
461 Params: []string{"END"},
462 })
463 case "ACK", "NAK":
464 if len(subParams) < 1 {
465 return newNeedMoreParamsError(msg.Command)
466 }
467 caps := strings.Fields(subParams[0])
468
469 for _, name := range caps {
470 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
471 return err
472 }
473 }
474
475 if uc.registered {
476 uc.forEachDownstream(func(dc *downstreamConn) {
477 dc.updateSupportedCaps()
478 })
479 }
480 case "NEW":
481 if len(subParams) < 1 {
482 return newNeedMoreParamsError(msg.Command)
483 }
484 uc.handleSupportedCaps(subParams[0])
485 uc.requestCaps()
486 case "DEL":
487 if len(subParams) < 1 {
488 return newNeedMoreParamsError(msg.Command)
489 }
490 caps := strings.Fields(subParams[0])
491
492 for _, c := range caps {
493 delete(uc.supportedCaps, c)
494 delete(uc.caps, c)
495 }
496
497 if uc.registered {
498 uc.forEachDownstream(func(dc *downstreamConn) {
499 dc.updateSupportedCaps()
500 })
501 }
502 default:
503 uc.logger.Printf("unhandled message: %v", msg)
504 }
505 case "AUTHENTICATE":
506 if uc.saslClient == nil {
507 return fmt.Errorf("received unexpected AUTHENTICATE message")
508 }
509
510 // TODO: if a challenge is 400 bytes long, buffer it
511 var challengeStr string
512 if err := parseMessageParams(msg, &challengeStr); err != nil {
513 uc.SendMessage(&irc.Message{
514 Command: "AUTHENTICATE",
515 Params: []string{"*"},
516 })
517 return err
518 }
519
520 var challenge []byte
521 if challengeStr != "+" {
522 var err error
523 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
524 if err != nil {
525 uc.SendMessage(&irc.Message{
526 Command: "AUTHENTICATE",
527 Params: []string{"*"},
528 })
529 return err
530 }
531 }
532
533 var resp []byte
534 var err error
535 if !uc.saslStarted {
536 _, resp, err = uc.saslClient.Start()
537 uc.saslStarted = true
538 } else {
539 resp, err = uc.saslClient.Next(challenge)
540 }
541 if err != nil {
542 uc.SendMessage(&irc.Message{
543 Command: "AUTHENTICATE",
544 Params: []string{"*"},
545 })
546 return err
547 }
548
549 // TODO: send response in multiple chunks if >= 400 bytes
550 var respStr = "+"
551 if len(resp) != 0 {
552 respStr = base64.StdEncoding.EncodeToString(resp)
553 }
554
555 uc.SendMessage(&irc.Message{
556 Command: "AUTHENTICATE",
557 Params: []string{respStr},
558 })
559 case irc.RPL_LOGGEDIN:
560 var account string
561 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
562 return err
563 }
564 uc.logger.Printf("logged in with account %q", account)
565 case irc.RPL_LOGGEDOUT:
566 uc.logger.Printf("logged out")
567 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
568 var info string
569 if err := parseMessageParams(msg, nil, &info); err != nil {
570 return err
571 }
572 switch msg.Command {
573 case irc.ERR_NICKLOCKED:
574 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
575 case irc.ERR_SASLFAIL:
576 uc.logger.Printf("SASL authentication failed: %v", info)
577 case irc.ERR_SASLTOOLONG:
578 uc.logger.Printf("SASL message too long: %v", info)
579 }
580
581 uc.saslClient = nil
582 uc.saslStarted = false
583
584 uc.SendMessage(&irc.Message{
585 Command: "CAP",
586 Params: []string{"END"},
587 })
588 case irc.RPL_WELCOME:
589 uc.registered = true
590 uc.logger.Printf("connection registered")
591
592 uc.forEachDownstream(func(dc *downstreamConn) {
593 dc.updateSupportedCaps()
594 })
595
596 if len(uc.network.channels) > 0 {
597 var channels, keys []string
598 for _, ch := range uc.network.channels {
599 channels = append(channels, ch.Name)
600 keys = append(keys, ch.Key)
601 }
602
603 for _, msg := range join(channels, keys) {
604 uc.SendMessage(msg)
605 }
606 }
607 case irc.RPL_MYINFO:
608 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
609 return err
610 }
611 case irc.RPL_ISUPPORT:
612 if err := parseMessageParams(msg, nil, nil); err != nil {
613 return err
614 }
615 for _, token := range msg.Params[1 : len(msg.Params)-1] {
616 negate := false
617 parameter := token
618 value := ""
619 if strings.HasPrefix(token, "-") {
620 negate = true
621 token = token[1:]
622 } else {
623 if i := strings.IndexByte(token, '='); i >= 0 {
624 parameter = token[:i]
625 value = token[i+1:]
626 }
627 }
628 if !negate {
629 switch parameter {
630 case "CHANMODES":
631 if err := uc.handleChanModes(value); err != nil {
632 return err
633 }
634 case "CHANTYPES":
635 uc.availableChannelTypes = value
636 case "PREFIX":
637 if err := uc.handleMemberships(value); err != nil {
638 return err
639 }
640 case "NETWORK":
641 uc.networkName = value
642 }
643 } else {
644 // TODO: handle ISUPPORT negations
645 }
646 }
647 case "BATCH":
648 var tag string
649 if err := parseMessageParams(msg, &tag); err != nil {
650 return err
651 }
652
653 if strings.HasPrefix(tag, "+") {
654 tag = tag[1:]
655 if _, ok := uc.batches[tag]; ok {
656 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
657 }
658 var batchType string
659 if err := parseMessageParams(msg, nil, &batchType); err != nil {
660 return err
661 }
662 label := label
663 if label == "" && msgBatch != nil {
664 label = msgBatch.Label
665 }
666 uc.batches[tag] = batch{
667 Type: batchType,
668 Params: msg.Params[2:],
669 Outer: msgBatch,
670 Label: label,
671 }
672 } else if strings.HasPrefix(tag, "-") {
673 tag = tag[1:]
674 if _, ok := uc.batches[tag]; !ok {
675 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
676 }
677 delete(uc.batches, tag)
678 } else {
679 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
680 }
681 case "NICK":
682 if msg.Prefix == nil {
683 return fmt.Errorf("expected a prefix")
684 }
685
686 var newNick string
687 if err := parseMessageParams(msg, &newNick); err != nil {
688 return err
689 }
690
691 me := false
692 if msg.Prefix.Name == uc.nick {
693 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
694 me = true
695 uc.nick = newNick
696 }
697
698 for _, ch := range uc.channels {
699 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
700 delete(ch.Members, msg.Prefix.Name)
701 ch.Members[newNick] = memberships
702 uc.appendLog(ch.Name, msg)
703 }
704 }
705
706 if !me {
707 uc.forEachDownstream(func(dc *downstreamConn) {
708 dc.SendMessage(dc.marshalMessage(msg, uc.network))
709 })
710 } else {
711 uc.forEachDownstream(func(dc *downstreamConn) {
712 dc.updateNick()
713 })
714 }
715 case "JOIN":
716 if msg.Prefix == nil {
717 return fmt.Errorf("expected a prefix")
718 }
719
720 var channels string
721 if err := parseMessageParams(msg, &channels); err != nil {
722 return err
723 }
724
725 for _, ch := range strings.Split(channels, ",") {
726 if msg.Prefix.Name == uc.nick {
727 uc.logger.Printf("joined channel %q", ch)
728 uc.channels[ch] = &upstreamChannel{
729 Name: ch,
730 conn: uc,
731 Members: make(map[string]*memberships),
732 }
733 uc.updateChannelAutoDetach(ch)
734
735 uc.SendMessage(&irc.Message{
736 Command: "MODE",
737 Params: []string{ch},
738 })
739 } else {
740 ch, err := uc.getChannel(ch)
741 if err != nil {
742 return err
743 }
744 ch.Members[msg.Prefix.Name] = &memberships{}
745 }
746
747 chMsg := msg.Copy()
748 chMsg.Params[0] = ch
749 uc.produce(ch, chMsg, nil)
750 }
751 case "PART":
752 if msg.Prefix == nil {
753 return fmt.Errorf("expected a prefix")
754 }
755
756 var channels string
757 if err := parseMessageParams(msg, &channels); err != nil {
758 return err
759 }
760
761 for _, ch := range strings.Split(channels, ",") {
762 if msg.Prefix.Name == uc.nick {
763 uc.logger.Printf("parted channel %q", ch)
764 if uch, ok := uc.channels[ch]; ok {
765 delete(uc.channels, ch)
766 uch.updateAutoDetach(0)
767 }
768 } else {
769 ch, err := uc.getChannel(ch)
770 if err != nil {
771 return err
772 }
773 delete(ch.Members, msg.Prefix.Name)
774 }
775
776 chMsg := msg.Copy()
777 chMsg.Params[0] = ch
778 uc.produce(ch, chMsg, nil)
779 }
780 case "KICK":
781 if msg.Prefix == nil {
782 return fmt.Errorf("expected a prefix")
783 }
784
785 var channel, user string
786 if err := parseMessageParams(msg, &channel, &user); err != nil {
787 return err
788 }
789
790 if user == uc.nick {
791 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
792 delete(uc.channels, channel)
793 } else {
794 ch, err := uc.getChannel(channel)
795 if err != nil {
796 return err
797 }
798 delete(ch.Members, user)
799 }
800
801 uc.produce(channel, msg, nil)
802 case "QUIT":
803 if msg.Prefix == nil {
804 return fmt.Errorf("expected a prefix")
805 }
806
807 if msg.Prefix.Name == uc.nick {
808 uc.logger.Printf("quit")
809 }
810
811 for _, ch := range uc.channels {
812 if _, ok := ch.Members[msg.Prefix.Name]; ok {
813 delete(ch.Members, msg.Prefix.Name)
814
815 uc.appendLog(ch.Name, msg)
816 }
817 }
818
819 if msg.Prefix.Name != uc.nick {
820 uc.forEachDownstream(func(dc *downstreamConn) {
821 dc.SendMessage(dc.marshalMessage(msg, uc.network))
822 })
823 }
824 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
825 var name, topic string
826 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
827 return err
828 }
829 ch, err := uc.getChannel(name)
830 if err != nil {
831 return err
832 }
833 if msg.Command == irc.RPL_TOPIC {
834 ch.Topic = topic
835 } else {
836 ch.Topic = ""
837 }
838 case "TOPIC":
839 if msg.Prefix == nil {
840 return fmt.Errorf("expected a prefix")
841 }
842
843 var name string
844 if err := parseMessageParams(msg, &name); err != nil {
845 return err
846 }
847 ch, err := uc.getChannel(name)
848 if err != nil {
849 return err
850 }
851 if len(msg.Params) > 1 {
852 ch.Topic = msg.Params[1]
853 ch.TopicWho = msg.Prefix.Copy()
854 ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
855 } else {
856 ch.Topic = ""
857 }
858 uc.produce(ch.Name, msg, nil)
859 case "MODE":
860 var name, modeStr string
861 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
862 return err
863 }
864
865 if !uc.isChannel(name) { // user mode change
866 if name != uc.nick {
867 return fmt.Errorf("received MODE message for unknown nick %q", name)
868 }
869 return uc.modes.Apply(modeStr)
870 // TODO: notify downstreams about user mode change?
871 } else { // channel mode change
872 ch, err := uc.getChannel(name)
873 if err != nil {
874 return err
875 }
876
877 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
878 if err != nil {
879 return err
880 }
881
882 uc.appendLog(ch.Name, msg)
883
884 if ch, ok := uc.network.channels[name]; !ok || !ch.Detached {
885 uc.forEachDownstream(func(dc *downstreamConn) {
886 params := make([]string, len(msg.Params))
887 params[0] = dc.marshalEntity(uc.network, name)
888 params[1] = modeStr
889
890 copy(params[2:], msg.Params[2:])
891 for i, modeParam := range params[2:] {
892 if _, ok := needMarshaling[i]; ok {
893 params[2+i] = dc.marshalEntity(uc.network, modeParam)
894 }
895 }
896
897 dc.SendMessage(&irc.Message{
898 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
899 Command: "MODE",
900 Params: params,
901 })
902 })
903 }
904 }
905 case irc.RPL_UMODEIS:
906 if err := parseMessageParams(msg, nil); err != nil {
907 return err
908 }
909 modeStr := ""
910 if len(msg.Params) > 1 {
911 modeStr = msg.Params[1]
912 }
913
914 uc.modes = ""
915 if err := uc.modes.Apply(modeStr); err != nil {
916 return err
917 }
918 // TODO: send RPL_UMODEIS to downstream connections when applicable
919 case irc.RPL_CHANNELMODEIS:
920 var channel string
921 if err := parseMessageParams(msg, nil, &channel); err != nil {
922 return err
923 }
924 modeStr := ""
925 if len(msg.Params) > 2 {
926 modeStr = msg.Params[2]
927 }
928
929 ch, err := uc.getChannel(channel)
930 if err != nil {
931 return err
932 }
933
934 firstMode := ch.modes == nil
935 ch.modes = make(map[byte]string)
936 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
937 return err
938 }
939 if firstMode {
940 if c, ok := uc.network.channels[channel]; !ok || !c.Detached {
941 modeStr, modeParams := ch.modes.Format()
942
943 uc.forEachDownstream(func(dc *downstreamConn) {
944 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
945 params = append(params, modeParams...)
946
947 dc.SendMessage(&irc.Message{
948 Prefix: dc.srv.prefix(),
949 Command: irc.RPL_CHANNELMODEIS,
950 Params: params,
951 })
952 })
953 }
954 }
955 case rpl_creationtime:
956 var channel, creationTime string
957 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
958 return err
959 }
960
961 ch, err := uc.getChannel(channel)
962 if err != nil {
963 return err
964 }
965
966 firstCreationTime := ch.creationTime == ""
967 ch.creationTime = creationTime
968 if firstCreationTime {
969 uc.forEachDownstream(func(dc *downstreamConn) {
970 dc.SendMessage(&irc.Message{
971 Prefix: dc.srv.prefix(),
972 Command: rpl_creationtime,
973 Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
974 })
975 })
976 }
977 case rpl_topicwhotime:
978 var name, who, timeStr string
979 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
980 return err
981 }
982 ch, err := uc.getChannel(name)
983 if err != nil {
984 return err
985 }
986 firstTopicWhoTime := ch.TopicWho == nil
987 ch.TopicWho = irc.ParsePrefix(who)
988 sec, err := strconv.ParseInt(timeStr, 10, 64)
989 if err != nil {
990 return fmt.Errorf("failed to parse topic time: %v", err)
991 }
992 ch.TopicTime = time.Unix(sec, 0)
993 if firstTopicWhoTime {
994 uc.forEachDownstream(func(dc *downstreamConn) {
995 topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
996 dc.SendMessage(&irc.Message{
997 Prefix: dc.srv.prefix(),
998 Command: rpl_topicwhotime,
999 Params: []string{
1000 dc.nick,
1001 dc.marshalEntity(uc.network, ch.Name),
1002 topicWho.String(),
1003 timeStr,
1004 },
1005 })
1006 })
1007 }
1008 case irc.RPL_LIST:
1009 var channel, clients, topic string
1010 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
1011 return err
1012 }
1013
1014 pl := uc.getPendingLIST()
1015 if pl == nil {
1016 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
1017 }
1018
1019 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
1020 dc.SendMessage(&irc.Message{
1021 Prefix: dc.srv.prefix(),
1022 Command: irc.RPL_LIST,
1023 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
1024 })
1025 })
1026 case irc.RPL_LISTEND:
1027 ok := uc.endPendingLISTs(false)
1028 if !ok {
1029 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
1030 }
1031 case irc.RPL_NAMREPLY:
1032 var name, statusStr, members string
1033 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
1034 return err
1035 }
1036
1037 ch, ok := uc.channels[name]
1038 if !ok {
1039 // NAMES on a channel we have not joined, forward to downstream
1040 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1041 channel := dc.marshalEntity(uc.network, name)
1042 members := splitSpace(members)
1043 for i, member := range members {
1044 memberships, nick := uc.parseMembershipPrefix(member)
1045 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1046 }
1047 memberStr := strings.Join(members, " ")
1048
1049 dc.SendMessage(&irc.Message{
1050 Prefix: dc.srv.prefix(),
1051 Command: irc.RPL_NAMREPLY,
1052 Params: []string{dc.nick, statusStr, channel, memberStr},
1053 })
1054 })
1055 return nil
1056 }
1057
1058 status, err := parseChannelStatus(statusStr)
1059 if err != nil {
1060 return err
1061 }
1062 ch.Status = status
1063
1064 for _, s := range splitSpace(members) {
1065 memberships, nick := uc.parseMembershipPrefix(s)
1066 ch.Members[nick] = memberships
1067 }
1068 case irc.RPL_ENDOFNAMES:
1069 var name string
1070 if err := parseMessageParams(msg, nil, &name); err != nil {
1071 return err
1072 }
1073
1074 ch, ok := uc.channels[name]
1075 if !ok {
1076 // NAMES on a channel we have not joined, forward to downstream
1077 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1078 channel := dc.marshalEntity(uc.network, name)
1079
1080 dc.SendMessage(&irc.Message{
1081 Prefix: dc.srv.prefix(),
1082 Command: irc.RPL_ENDOFNAMES,
1083 Params: []string{dc.nick, channel, "End of /NAMES list"},
1084 })
1085 })
1086 return nil
1087 }
1088
1089 if ch.complete {
1090 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1091 }
1092 ch.complete = true
1093
1094 if c, ok := uc.network.channels[name]; !ok || !c.Detached {
1095 uc.forEachDownstream(func(dc *downstreamConn) {
1096 forwardChannel(dc, ch)
1097 })
1098 }
1099 case irc.RPL_WHOREPLY:
1100 var channel, username, host, server, nick, mode, trailing string
1101 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1102 return err
1103 }
1104
1105 parts := strings.SplitN(trailing, " ", 2)
1106 if len(parts) != 2 {
1107 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1108 }
1109 realname := parts[1]
1110 hops, err := strconv.Atoi(parts[0])
1111 if err != nil {
1112 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1113 }
1114 hops++
1115
1116 trailing = strconv.Itoa(hops) + " " + realname
1117
1118 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1119 channel := channel
1120 if channel != "*" {
1121 channel = dc.marshalEntity(uc.network, channel)
1122 }
1123 nick := dc.marshalEntity(uc.network, nick)
1124 dc.SendMessage(&irc.Message{
1125 Prefix: dc.srv.prefix(),
1126 Command: irc.RPL_WHOREPLY,
1127 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1128 })
1129 })
1130 case irc.RPL_ENDOFWHO:
1131 var name string
1132 if err := parseMessageParams(msg, nil, &name); err != nil {
1133 return err
1134 }
1135
1136 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1137 name := name
1138 if name != "*" {
1139 // TODO: support WHO masks
1140 name = dc.marshalEntity(uc.network, name)
1141 }
1142 dc.SendMessage(&irc.Message{
1143 Prefix: dc.srv.prefix(),
1144 Command: irc.RPL_ENDOFWHO,
1145 Params: []string{dc.nick, name, "End of /WHO list"},
1146 })
1147 })
1148 case irc.RPL_WHOISUSER:
1149 var nick, username, host, realname string
1150 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); 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_WHOISUSER,
1159 Params: []string{dc.nick, nick, username, host, "*", realname},
1160 })
1161 })
1162 case irc.RPL_WHOISSERVER:
1163 var nick, server, serverInfo string
1164 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1165 return err
1166 }
1167
1168 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1169 nick := dc.marshalEntity(uc.network, nick)
1170 dc.SendMessage(&irc.Message{
1171 Prefix: dc.srv.prefix(),
1172 Command: irc.RPL_WHOISSERVER,
1173 Params: []string{dc.nick, nick, server, serverInfo},
1174 })
1175 })
1176 case irc.RPL_WHOISOPERATOR:
1177 var nick string
1178 if err := parseMessageParams(msg, nil, &nick); err != nil {
1179 return err
1180 }
1181
1182 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1183 nick := dc.marshalEntity(uc.network, nick)
1184 dc.SendMessage(&irc.Message{
1185 Prefix: dc.srv.prefix(),
1186 Command: irc.RPL_WHOISOPERATOR,
1187 Params: []string{dc.nick, nick, "is an IRC operator"},
1188 })
1189 })
1190 case irc.RPL_WHOISIDLE:
1191 var nick string
1192 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1193 return err
1194 }
1195
1196 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1197 nick := dc.marshalEntity(uc.network, nick)
1198 params := []string{dc.nick, nick}
1199 params = append(params, msg.Params[2:]...)
1200 dc.SendMessage(&irc.Message{
1201 Prefix: dc.srv.prefix(),
1202 Command: irc.RPL_WHOISIDLE,
1203 Params: params,
1204 })
1205 })
1206 case irc.RPL_WHOISCHANNELS:
1207 var nick, channelList string
1208 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1209 return err
1210 }
1211 channels := splitSpace(channelList)
1212
1213 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1214 nick := dc.marshalEntity(uc.network, nick)
1215 channelList := make([]string, len(channels))
1216 for i, channel := range channels {
1217 prefix, channel := uc.parseMembershipPrefix(channel)
1218 channel = dc.marshalEntity(uc.network, channel)
1219 channelList[i] = prefix.Format(dc) + channel
1220 }
1221 channels := strings.Join(channelList, " ")
1222 dc.SendMessage(&irc.Message{
1223 Prefix: dc.srv.prefix(),
1224 Command: irc.RPL_WHOISCHANNELS,
1225 Params: []string{dc.nick, nick, channels},
1226 })
1227 })
1228 case irc.RPL_ENDOFWHOIS:
1229 var nick string
1230 if err := parseMessageParams(msg, nil, &nick); err != nil {
1231 return err
1232 }
1233
1234 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1235 nick := dc.marshalEntity(uc.network, nick)
1236 dc.SendMessage(&irc.Message{
1237 Prefix: dc.srv.prefix(),
1238 Command: irc.RPL_ENDOFWHOIS,
1239 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1240 })
1241 })
1242 case "INVITE":
1243 var nick, channel string
1244 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1245 return err
1246 }
1247
1248 weAreInvited := nick == uc.nick
1249
1250 uc.forEachDownstream(func(dc *downstreamConn) {
1251 if !weAreInvited && !dc.caps["invite-notify"] {
1252 return
1253 }
1254 dc.SendMessage(&irc.Message{
1255 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1256 Command: "INVITE",
1257 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1258 })
1259 })
1260 case irc.RPL_INVITING:
1261 var nick, channel string
1262 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1263 return err
1264 }
1265
1266 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1267 dc.SendMessage(&irc.Message{
1268 Prefix: dc.srv.prefix(),
1269 Command: irc.RPL_INVITING,
1270 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1271 })
1272 })
1273 case irc.RPL_AWAY:
1274 var nick, reason string
1275 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1276 return err
1277 }
1278
1279 uc.forEachDownstream(func(dc *downstreamConn) {
1280 dc.SendMessage(&irc.Message{
1281 Prefix: dc.srv.prefix(),
1282 Command: irc.RPL_AWAY,
1283 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1284 })
1285 })
1286 case "AWAY":
1287 if msg.Prefix == nil {
1288 return fmt.Errorf("expected a prefix")
1289 }
1290
1291 uc.forEachDownstream(func(dc *downstreamConn) {
1292 if !dc.caps["away-notify"] {
1293 return
1294 }
1295 dc.SendMessage(&irc.Message{
1296 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1297 Command: "AWAY",
1298 Params: msg.Params,
1299 })
1300 })
1301 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1302 var channel, mask string
1303 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1304 return err
1305 }
1306 var addNick, addTime string
1307 if len(msg.Params) >= 5 {
1308 addNick = msg.Params[3]
1309 addTime = msg.Params[4]
1310 }
1311
1312 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1313 channel := dc.marshalEntity(uc.network, channel)
1314
1315 var params []string
1316 if addNick != "" && addTime != "" {
1317 addNick := dc.marshalEntity(uc.network, addNick)
1318 params = []string{dc.nick, channel, mask, addNick, addTime}
1319 } else {
1320 params = []string{dc.nick, channel, mask}
1321 }
1322
1323 dc.SendMessage(&irc.Message{
1324 Prefix: dc.srv.prefix(),
1325 Command: msg.Command,
1326 Params: params,
1327 })
1328 })
1329 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1330 var channel, trailing string
1331 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1332 return err
1333 }
1334
1335 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1336 upstreamChannel := dc.marshalEntity(uc.network, channel)
1337 dc.SendMessage(&irc.Message{
1338 Prefix: dc.srv.prefix(),
1339 Command: msg.Command,
1340 Params: []string{dc.nick, upstreamChannel, trailing},
1341 })
1342 })
1343 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1344 var command, reason string
1345 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1346 return err
1347 }
1348
1349 if command == "LIST" {
1350 ok := uc.endPendingLISTs(false)
1351 if !ok {
1352 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1353 }
1354 }
1355
1356 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1357 dc.SendMessage(&irc.Message{
1358 Prefix: uc.srv.prefix(),
1359 Command: msg.Command,
1360 Params: []string{dc.nick, command, reason},
1361 })
1362 })
1363 case "ACK":
1364 // Ignore
1365 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1366 // Ignore
1367 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1368 // Ignore
1369 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1370 // Ignore
1371 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1372 // Ignore
1373 case irc.RPL_LISTSTART:
1374 // Ignore
1375 case rpl_localusers, rpl_globalusers:
1376 // Ignore
1377 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1378 // Ignore
1379 case "ERROR":
1380 var text string
1381 if err := parseMessageParams(msg, &text); err != nil {
1382 return err
1383 }
1384 return fmt.Errorf("fatal server error: %v", text)
1385 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
1386 if !uc.registered {
1387 text := msg.Params[len(msg.Params)-1]
1388 return registrationError(text)
1389 }
1390 fallthrough
1391 default:
1392 uc.logger.Printf("unhandled message: %v", msg)
1393
1394 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1395 // best effort marshaling for unknown messages, replies and errors:
1396 // most numerics start with the user nick, marshal it if that's the case
1397 // otherwise, conservately keep the params without marshaling
1398 params := msg.Params
1399 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1400 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1401 params[0] = dc.nick
1402 }
1403 }
1404 dc.SendMessage(&irc.Message{
1405 Prefix: uc.srv.prefix(),
1406 Command: msg.Command,
1407 Params: params,
1408 })
1409 })
1410 }
1411 return nil
1412}
1413
1414func (uc *upstreamConn) handleDetachedMessage(sender string, text string, ch *Channel) {
1415 highlight := sender != uc.nick && isHighlight(text, uc.nick)
1416 if ch.RelayDetached == FilterMessage || ((ch.RelayDetached == FilterHighlight || ch.RelayDetached == FilterDefault) && highlight) {
1417 uc.forEachDownstream(func(dc *downstreamConn) {
1418 if highlight {
1419 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1420 } else {
1421 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1422 }
1423 })
1424 }
1425 if ch.ReattachOn == FilterMessage || (ch.ReattachOn == FilterHighlight && highlight) {
1426 uc.network.attach(ch)
1427 if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1428 uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
1429 }
1430 }
1431}
1432
1433func (uc *upstreamConn) handleChanModes(s string) error {
1434 parts := strings.SplitN(s, ",", 5)
1435 if len(parts) < 4 {
1436 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
1437 }
1438 modes := make(map[byte]channelModeType)
1439 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
1440 for j := 0; j < len(parts[i]); j++ {
1441 mode := parts[i][j]
1442 modes[mode] = mt
1443 }
1444 }
1445 uc.availableChannelModes = modes
1446 return nil
1447}
1448
1449func (uc *upstreamConn) handleMemberships(s string) error {
1450 if s == "" {
1451 uc.availableMemberships = nil
1452 return nil
1453 }
1454
1455 if s[0] != '(' {
1456 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1457 }
1458 sep := strings.IndexByte(s, ')')
1459 if sep < 0 || len(s) != sep*2 {
1460 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1461 }
1462 memberships := make([]membership, len(s)/2-1)
1463 for i := range memberships {
1464 memberships[i] = membership{
1465 Mode: s[i+1],
1466 Prefix: s[sep+i+1],
1467 }
1468 }
1469 uc.availableMemberships = memberships
1470 return nil
1471}
1472
1473func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1474 caps := strings.Fields(capsStr)
1475 for _, s := range caps {
1476 kv := strings.SplitN(s, "=", 2)
1477 k := strings.ToLower(kv[0])
1478 var v string
1479 if len(kv) == 2 {
1480 v = kv[1]
1481 }
1482 uc.supportedCaps[k] = v
1483 }
1484}
1485
1486func (uc *upstreamConn) requestCaps() {
1487 var requestCaps []string
1488 for c := range permanentUpstreamCaps {
1489 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1490 requestCaps = append(requestCaps, c)
1491 }
1492 }
1493
1494 if uc.requestSASL() && !uc.caps["sasl"] {
1495 requestCaps = append(requestCaps, "sasl")
1496 }
1497
1498 if len(requestCaps) == 0 {
1499 return
1500 }
1501
1502 uc.SendMessage(&irc.Message{
1503 Command: "CAP",
1504 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1505 })
1506}
1507
1508func (uc *upstreamConn) requestSASL() bool {
1509 if uc.network.SASL.Mechanism == "" {
1510 return false
1511 }
1512
1513 v, ok := uc.supportedCaps["sasl"]
1514 if !ok {
1515 return false
1516 }
1517 if v != "" {
1518 mechanisms := strings.Split(v, ",")
1519 found := false
1520 for _, mech := range mechanisms {
1521 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1522 found = true
1523 break
1524 }
1525 }
1526 if !found {
1527 return false
1528 }
1529 }
1530
1531 return true
1532}
1533
1534func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1535 uc.caps[name] = ok
1536
1537 switch name {
1538 case "sasl":
1539 if !ok {
1540 uc.logger.Printf("server refused to acknowledge the SASL capability")
1541 return nil
1542 }
1543
1544 auth := &uc.network.SASL
1545 switch auth.Mechanism {
1546 case "PLAIN":
1547 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1548 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1549 case "EXTERNAL":
1550 uc.logger.Printf("starting SASL EXTERNAL authentication")
1551 uc.saslClient = sasl.NewExternalClient("")
1552 default:
1553 return fmt.Errorf("unsupported SASL mechanism %q", name)
1554 }
1555
1556 uc.SendMessage(&irc.Message{
1557 Command: "AUTHENTICATE",
1558 Params: []string{auth.Mechanism},
1559 })
1560 default:
1561 if permanentUpstreamCaps[name] {
1562 break
1563 }
1564 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1565 }
1566 return nil
1567}
1568
1569func splitSpace(s string) []string {
1570 return strings.FieldsFunc(s, func(r rune) bool {
1571 return r == ' '
1572 })
1573}
1574
1575func (uc *upstreamConn) register() {
1576 uc.nick = uc.network.Nick
1577 uc.username = uc.network.GetUsername()
1578 uc.realname = uc.network.GetRealname()
1579
1580 uc.SendMessage(&irc.Message{
1581 Command: "CAP",
1582 Params: []string{"LS", "302"},
1583 })
1584
1585 if uc.network.Pass != "" {
1586 uc.SendMessage(&irc.Message{
1587 Command: "PASS",
1588 Params: []string{uc.network.Pass},
1589 })
1590 }
1591
1592 uc.SendMessage(&irc.Message{
1593 Command: "NICK",
1594 Params: []string{uc.nick},
1595 })
1596 uc.SendMessage(&irc.Message{
1597 Command: "USER",
1598 Params: []string{uc.username, "0", "*", uc.realname},
1599 })
1600}
1601
1602func (uc *upstreamConn) runUntilRegistered() error {
1603 for !uc.registered {
1604 msg, err := uc.ReadMessage()
1605 if err != nil {
1606 return fmt.Errorf("failed to read message: %v", err)
1607 }
1608
1609 if err := uc.handleMessage(msg); err != nil {
1610 if _, ok := err.(registrationError); ok {
1611 return err
1612 } else {
1613 msg.Tags = nil // prevent message tags from cluttering logs
1614 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1615 }
1616 }
1617 }
1618
1619 for _, command := range uc.network.ConnectCommands {
1620 m, err := irc.ParseMessage(command)
1621 if err != nil {
1622 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1623 } else {
1624 uc.SendMessage(m)
1625 }
1626 }
1627
1628 return nil
1629}
1630
1631func (uc *upstreamConn) readMessages(ch chan<- event) error {
1632 for {
1633 msg, err := uc.ReadMessage()
1634 if err == io.EOF {
1635 break
1636 } else if err != nil {
1637 return fmt.Errorf("failed to read IRC command: %v", err)
1638 }
1639
1640 ch <- eventUpstreamMessage{msg, uc}
1641 }
1642
1643 return nil
1644}
1645
1646func (uc *upstreamConn) SendMessage(msg *irc.Message) {
1647 if !uc.caps["message-tags"] {
1648 msg = msg.Copy()
1649 msg.Tags = nil
1650 }
1651
1652 uc.conn.SendMessage(msg)
1653}
1654
1655func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1656 if uc.caps["labeled-response"] {
1657 if msg.Tags == nil {
1658 msg.Tags = make(map[string]irc.TagValue)
1659 }
1660 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1661 uc.nextLabelID++
1662 }
1663 uc.SendMessage(msg)
1664}
1665
1666// appendLog appends a message to the log file.
1667//
1668// The internal message ID is returned. If the message isn't recorded in the
1669// log file, an empty string is returned.
1670func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string) {
1671 if uc.user.msgStore == nil {
1672 return ""
1673 }
1674
1675 detached := false
1676 if ch, ok := uc.network.channels[entity]; ok {
1677 detached = ch.Detached
1678 }
1679
1680 delivered, ok := uc.network.delivered[entity]
1681 if !ok {
1682 lastID, err := uc.user.msgStore.LastMsgID(uc.network, entity, time.Now())
1683 if err != nil {
1684 uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
1685 return ""
1686 }
1687
1688 delivered = make(map[string]string)
1689 uc.network.delivered[entity] = delivered
1690
1691 for clientName, _ := range uc.network.offlineClients {
1692 delivered[clientName] = lastID
1693 }
1694
1695 if detached {
1696 // If the channel is detached, online clients act as offline
1697 // clients too
1698 uc.forEachDownstream(func(dc *downstreamConn) {
1699 delivered[dc.clientName] = lastID
1700 })
1701 }
1702 }
1703
1704 msgID, err := uc.user.msgStore.Append(uc.network, entity, msg)
1705 if err != nil {
1706 uc.logger.Printf("failed to log message: %v", err)
1707 return ""
1708 }
1709
1710 return msgID
1711}
1712
1713// produce appends a message to the logs and forwards it to connected downstream
1714// connections.
1715//
1716// If origin is not nil and origin doesn't support echo-message, the message is
1717// forwarded to all connections except origin.
1718func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1719 var msgID string
1720 if target != "" {
1721 msgID = uc.appendLog(target, msg)
1722 }
1723
1724 // Don't forward messages if it's a detached channel
1725 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1726 return
1727 }
1728
1729 uc.forEachDownstream(func(dc *downstreamConn) {
1730 if dc != origin || dc.caps["echo-message"] {
1731 dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
1732 } else {
1733 dc.advanceMessageWithID(msg, msgID)
1734 }
1735 })
1736}
1737
1738func (uc *upstreamConn) updateAway() {
1739 away := true
1740 uc.forEachDownstream(func(*downstreamConn) {
1741 away = false
1742 })
1743 if away == uc.away {
1744 return
1745 }
1746 if away {
1747 uc.SendMessage(&irc.Message{
1748 Command: "AWAY",
1749 Params: []string{"Auto away"},
1750 })
1751 } else {
1752 uc.SendMessage(&irc.Message{
1753 Command: "AWAY",
1754 })
1755 }
1756 uc.away = away
1757}
1758
1759func (uc *upstreamConn) updateChannelAutoDetach(name string) {
1760 if uch, ok := uc.channels[name]; ok {
1761 if ch, ok := uc.network.channels[name]; ok && !ch.Detached {
1762 uch.updateAutoDetach(ch.DetachAfter)
1763 }
1764 }
1765}
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