source: code/trunk/upstream.go@ 462

Last change on this file since 462 was 462, checked in by contact, 4 years ago

Properly handle all ISUPPORT negations
File size: 44.7 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 availableUserModes string
82 availableChannelModes map[byte]channelModeType
83 availableChannelTypes string
84 availableMemberships []membership
85 isupport map[string]*string
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 isupport: make(map[string]*string),
197 pendingLISTDownstreamSet: make(map[uint64]struct{}),
198 }
199 return uc, nil
200}
201
202func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
203 uc.network.forEachDownstream(f)
204}
205
206func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
207 uc.forEachDownstream(func(dc *downstreamConn) {
208 if id != 0 && id != dc.id {
209 return
210 }
211 f(dc)
212 })
213}
214
215func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
216 ch, ok := uc.channels[name]
217 if !ok {
218 return nil, fmt.Errorf("unknown channel %q", name)
219 }
220 return ch, nil
221}
222
223func (uc *upstreamConn) isChannel(entity string) bool {
224 return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
225}
226
227func (uc *upstreamConn) getPendingLIST() *pendingLIST {
228 for _, pl := range uc.user.pendingLISTs {
229 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
230 continue
231 }
232 return &pl
233 }
234 return nil
235}
236
237func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
238 found = false
239 for i := 0; i < len(uc.user.pendingLISTs); i++ {
240 pl := uc.user.pendingLISTs[i]
241 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
242 continue
243 }
244 delete(pl.pendingCommands, uc.network.ID)
245 if len(pl.pendingCommands) == 0 {
246 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
247 i--
248 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
249 dc.SendMessage(&irc.Message{
250 Prefix: dc.srv.prefix(),
251 Command: irc.RPL_LISTEND,
252 Params: []string{dc.nick, "End of /LIST"},
253 })
254 })
255 }
256 found = true
257 if !all {
258 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
259 uc.user.forEachUpstream(func(uc *upstreamConn) {
260 uc.trySendLIST(pl.downstreamID)
261 })
262 return
263 }
264 }
265 return
266}
267
268func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
269 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
270 // a LIST command is already pending
271 // we will try again when that command is completed
272 return
273 }
274
275 for _, pl := range uc.user.pendingLISTs {
276 if pl.downstreamID != downstreamID {
277 continue
278 }
279 // this is the first pending LIST command list of the downstream
280 listCommand, ok := pl.pendingCommands[uc.network.ID]
281 if !ok {
282 // there is no command for this upstream in these LIST commands
283 // do not send anything
284 continue
285 }
286 // there is a command for this upstream in these LIST commands
287 // send it now
288
289 uc.SendMessageLabeled(downstreamID, listCommand)
290
291 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
292 return
293 }
294}
295
296func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
297 memberships := make(memberships, 0, 4)
298 i := 0
299 for _, m := range uc.availableMemberships {
300 if i >= len(s) {
301 break
302 }
303 if s[i] == m.Prefix {
304 memberships = append(memberships, m)
305 i++
306 }
307 }
308 return &memberships, s[i:]
309}
310
311func isWordBoundary(r rune) bool {
312 switch r {
313 case '-', '_', '|':
314 return false
315 case '\u00A0':
316 return true
317 default:
318 return !unicode.IsLetter(r) && !unicode.IsNumber(r)
319 }
320}
321
322func isHighlight(text, nick string) bool {
323 for {
324 i := strings.Index(text, nick)
325 if i < 0 {
326 return false
327 }
328
329 // Detect word boundaries
330 var left, right rune
331 if i > 0 {
332 left, _ = utf8.DecodeLastRuneInString(text[:i])
333 }
334 if i < len(text) {
335 right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
336 }
337 if isWordBoundary(left) && isWordBoundary(right) {
338 return true
339 }
340
341 text = text[i+len(nick):]
342 }
343}
344
345func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
346 var label string
347 if l, ok := msg.GetTag("label"); ok {
348 label = l
349 }
350
351 var msgBatch *batch
352 if batchName, ok := msg.GetTag("batch"); ok {
353 b, ok := uc.batches[batchName]
354 if !ok {
355 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
356 }
357 msgBatch = &b
358 if label == "" {
359 label = msgBatch.Label
360 }
361 delete(msg.Tags, "batch")
362 }
363
364 var downstreamID uint64 = 0
365 if label != "" {
366 var labelOffset uint64
367 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
368 if err == nil && n < 2 {
369 err = errors.New("not enough arguments")
370 }
371 if err != nil {
372 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
373 }
374 }
375
376 if _, ok := msg.Tags["time"]; !ok {
377 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
378 }
379
380 switch msg.Command {
381 case "PING":
382 uc.SendMessage(&irc.Message{
383 Command: "PONG",
384 Params: msg.Params,
385 })
386 return nil
387 case "NOTICE", "PRIVMSG", "TAGMSG":
388 if msg.Prefix == nil {
389 return fmt.Errorf("expected a prefix")
390 }
391
392 var entity, text string
393 if msg.Command != "TAGMSG" {
394 if err := parseMessageParams(msg, &entity, &text); err != nil {
395 return err
396 }
397 } else {
398 if err := parseMessageParams(msg, &entity); err != nil {
399 return err
400 }
401 }
402
403 if msg.Prefix.Name == serviceNick {
404 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
405 break
406 }
407 if entity == serviceNick {
408 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
409 break
410 }
411
412 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
413 uc.produce("", msg, nil)
414 } else { // regular user message
415 target := entity
416 if target == uc.nick {
417 target = msg.Prefix.Name
418 }
419
420 if ch, ok := uc.network.channels[target]; ok {
421 if ch.Detached {
422 uc.handleDetachedMessage(msg.Prefix.Name, text, ch)
423 }
424
425 highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
426 if ch.DetachOn == FilterMessage || ch.DetachOn == FilterDefault || (ch.DetachOn == FilterHighlight && highlight) {
427 uc.updateChannelAutoDetach(target)
428 }
429 }
430
431 uc.produce(target, msg, nil)
432 }
433 case "CAP":
434 var subCmd string
435 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
436 return err
437 }
438 subCmd = strings.ToUpper(subCmd)
439 subParams := msg.Params[2:]
440 switch subCmd {
441 case "LS":
442 if len(subParams) < 1 {
443 return newNeedMoreParamsError(msg.Command)
444 }
445 caps := subParams[len(subParams)-1]
446 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
447
448 uc.handleSupportedCaps(caps)
449
450 if more {
451 break // wait to receive all capabilities
452 }
453
454 uc.requestCaps()
455
456 if uc.requestSASL() {
457 break // we'll send CAP END after authentication is completed
458 }
459
460 uc.SendMessage(&irc.Message{
461 Command: "CAP",
462 Params: []string{"END"},
463 })
464 case "ACK", "NAK":
465 if len(subParams) < 1 {
466 return newNeedMoreParamsError(msg.Command)
467 }
468 caps := strings.Fields(subParams[0])
469
470 for _, name := range caps {
471 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
472 return err
473 }
474 }
475
476 if uc.registered {
477 uc.forEachDownstream(func(dc *downstreamConn) {
478 dc.updateSupportedCaps()
479 })
480 }
481 case "NEW":
482 if len(subParams) < 1 {
483 return newNeedMoreParamsError(msg.Command)
484 }
485 uc.handleSupportedCaps(subParams[0])
486 uc.requestCaps()
487 case "DEL":
488 if len(subParams) < 1 {
489 return newNeedMoreParamsError(msg.Command)
490 }
491 caps := strings.Fields(subParams[0])
492
493 for _, c := range caps {
494 delete(uc.supportedCaps, c)
495 delete(uc.caps, c)
496 }
497
498 if uc.registered {
499 uc.forEachDownstream(func(dc *downstreamConn) {
500 dc.updateSupportedCaps()
501 })
502 }
503 default:
504 uc.logger.Printf("unhandled message: %v", msg)
505 }
506 case "AUTHENTICATE":
507 if uc.saslClient == nil {
508 return fmt.Errorf("received unexpected AUTHENTICATE message")
509 }
510
511 // TODO: if a challenge is 400 bytes long, buffer it
512 var challengeStr string
513 if err := parseMessageParams(msg, &challengeStr); err != nil {
514 uc.SendMessage(&irc.Message{
515 Command: "AUTHENTICATE",
516 Params: []string{"*"},
517 })
518 return err
519 }
520
521 var challenge []byte
522 if challengeStr != "+" {
523 var err error
524 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
525 if err != nil {
526 uc.SendMessage(&irc.Message{
527 Command: "AUTHENTICATE",
528 Params: []string{"*"},
529 })
530 return err
531 }
532 }
533
534 var resp []byte
535 var err error
536 if !uc.saslStarted {
537 _, resp, err = uc.saslClient.Start()
538 uc.saslStarted = true
539 } else {
540 resp, err = uc.saslClient.Next(challenge)
541 }
542 if err != nil {
543 uc.SendMessage(&irc.Message{
544 Command: "AUTHENTICATE",
545 Params: []string{"*"},
546 })
547 return err
548 }
549
550 // TODO: send response in multiple chunks if >= 400 bytes
551 var respStr = "+"
552 if len(resp) != 0 {
553 respStr = base64.StdEncoding.EncodeToString(resp)
554 }
555
556 uc.SendMessage(&irc.Message{
557 Command: "AUTHENTICATE",
558 Params: []string{respStr},
559 })
560 case irc.RPL_LOGGEDIN:
561 var account string
562 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
563 return err
564 }
565 uc.logger.Printf("logged in with account %q", account)
566 case irc.RPL_LOGGEDOUT:
567 uc.logger.Printf("logged out")
568 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
569 var info string
570 if err := parseMessageParams(msg, nil, &info); err != nil {
571 return err
572 }
573 switch msg.Command {
574 case irc.ERR_NICKLOCKED:
575 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
576 case irc.ERR_SASLFAIL:
577 uc.logger.Printf("SASL authentication failed: %v", info)
578 case irc.ERR_SASLTOOLONG:
579 uc.logger.Printf("SASL message too long: %v", info)
580 }
581
582 uc.saslClient = nil
583 uc.saslStarted = false
584
585 uc.SendMessage(&irc.Message{
586 Command: "CAP",
587 Params: []string{"END"},
588 })
589 case irc.RPL_WELCOME:
590 uc.registered = true
591 uc.logger.Printf("connection registered")
592
593 uc.forEachDownstream(func(dc *downstreamConn) {
594 dc.updateSupportedCaps()
595 })
596
597 if len(uc.network.channels) > 0 {
598 var channels, keys []string
599 for _, ch := range uc.network.channels {
600 channels = append(channels, ch.Name)
601 keys = append(keys, ch.Key)
602 }
603
604 for _, msg := range join(channels, keys) {
605 uc.SendMessage(msg)
606 }
607 }
608 case irc.RPL_MYINFO:
609 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
610 return err
611 }
612 case irc.RPL_ISUPPORT:
613 if err := parseMessageParams(msg, nil, nil); err != nil {
614 return err
615 }
616 for _, token := range msg.Params[1 : len(msg.Params)-1] {
617 parameter := token
618 var negate, hasValue bool
619 var value string
620 if strings.HasPrefix(token, "-") {
621 negate = true
622 token = token[1:]
623 } else if i := strings.IndexByte(token, '='); i >= 0 {
624 parameter = token[:i]
625 value = token[i+1:]
626 hasValue = true
627 }
628
629 if hasValue {
630 uc.isupport[parameter] = &value
631 } else if !negate {
632 uc.isupport[parameter] = nil
633 } else {
634 delete(uc.isupport, parameter)
635 }
636
637 var err error
638 switch parameter {
639 case "CHANMODES":
640 if !negate {
641 err = uc.handleChanModes(value)
642 } else {
643 uc.availableChannelModes = stdChannelModes
644 }
645 case "CHANTYPES":
646 if !negate {
647 uc.availableChannelTypes = value
648 } else {
649 uc.availableChannelTypes = stdChannelTypes
650 }
651 case "PREFIX":
652 if !negate {
653 err = uc.handleMemberships(value)
654 } else {
655 uc.availableMemberships = stdMemberships
656 }
657 }
658 if err != nil {
659 return err
660 }
661 }
662 case "BATCH":
663 var tag string
664 if err := parseMessageParams(msg, &tag); err != nil {
665 return err
666 }
667
668 if strings.HasPrefix(tag, "+") {
669 tag = tag[1:]
670 if _, ok := uc.batches[tag]; ok {
671 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
672 }
673 var batchType string
674 if err := parseMessageParams(msg, nil, &batchType); err != nil {
675 return err
676 }
677 label := label
678 if label == "" && msgBatch != nil {
679 label = msgBatch.Label
680 }
681 uc.batches[tag] = batch{
682 Type: batchType,
683 Params: msg.Params[2:],
684 Outer: msgBatch,
685 Label: label,
686 }
687 } else if strings.HasPrefix(tag, "-") {
688 tag = tag[1:]
689 if _, ok := uc.batches[tag]; !ok {
690 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
691 }
692 delete(uc.batches, tag)
693 } else {
694 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
695 }
696 case "NICK":
697 if msg.Prefix == nil {
698 return fmt.Errorf("expected a prefix")
699 }
700
701 var newNick string
702 if err := parseMessageParams(msg, &newNick); err != nil {
703 return err
704 }
705
706 me := false
707 if msg.Prefix.Name == uc.nick {
708 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
709 me = true
710 uc.nick = newNick
711 }
712
713 for _, ch := range uc.channels {
714 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
715 delete(ch.Members, msg.Prefix.Name)
716 ch.Members[newNick] = memberships
717 uc.appendLog(ch.Name, msg)
718 }
719 }
720
721 if !me {
722 uc.forEachDownstream(func(dc *downstreamConn) {
723 dc.SendMessage(dc.marshalMessage(msg, uc.network))
724 })
725 } else {
726 uc.forEachDownstream(func(dc *downstreamConn) {
727 dc.updateNick()
728 })
729 }
730 case "JOIN":
731 if msg.Prefix == nil {
732 return fmt.Errorf("expected a prefix")
733 }
734
735 var channels string
736 if err := parseMessageParams(msg, &channels); err != nil {
737 return err
738 }
739
740 for _, ch := range strings.Split(channels, ",") {
741 if msg.Prefix.Name == uc.nick {
742 uc.logger.Printf("joined channel %q", ch)
743 uc.channels[ch] = &upstreamChannel{
744 Name: ch,
745 conn: uc,
746 Members: make(map[string]*memberships),
747 }
748 uc.updateChannelAutoDetach(ch)
749
750 uc.SendMessage(&irc.Message{
751 Command: "MODE",
752 Params: []string{ch},
753 })
754 } else {
755 ch, err := uc.getChannel(ch)
756 if err != nil {
757 return err
758 }
759 ch.Members[msg.Prefix.Name] = &memberships{}
760 }
761
762 chMsg := msg.Copy()
763 chMsg.Params[0] = ch
764 uc.produce(ch, chMsg, nil)
765 }
766 case "PART":
767 if msg.Prefix == nil {
768 return fmt.Errorf("expected a prefix")
769 }
770
771 var channels string
772 if err := parseMessageParams(msg, &channels); err != nil {
773 return err
774 }
775
776 for _, ch := range strings.Split(channels, ",") {
777 if msg.Prefix.Name == uc.nick {
778 uc.logger.Printf("parted channel %q", ch)
779 if uch, ok := uc.channels[ch]; ok {
780 delete(uc.channels, ch)
781 uch.updateAutoDetach(0)
782 }
783 } else {
784 ch, err := uc.getChannel(ch)
785 if err != nil {
786 return err
787 }
788 delete(ch.Members, msg.Prefix.Name)
789 }
790
791 chMsg := msg.Copy()
792 chMsg.Params[0] = ch
793 uc.produce(ch, chMsg, nil)
794 }
795 case "KICK":
796 if msg.Prefix == nil {
797 return fmt.Errorf("expected a prefix")
798 }
799
800 var channel, user string
801 if err := parseMessageParams(msg, &channel, &user); err != nil {
802 return err
803 }
804
805 if user == uc.nick {
806 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
807 delete(uc.channels, channel)
808 } else {
809 ch, err := uc.getChannel(channel)
810 if err != nil {
811 return err
812 }
813 delete(ch.Members, user)
814 }
815
816 uc.produce(channel, msg, nil)
817 case "QUIT":
818 if msg.Prefix == nil {
819 return fmt.Errorf("expected a prefix")
820 }
821
822 if msg.Prefix.Name == uc.nick {
823 uc.logger.Printf("quit")
824 }
825
826 for _, ch := range uc.channels {
827 if _, ok := ch.Members[msg.Prefix.Name]; ok {
828 delete(ch.Members, msg.Prefix.Name)
829
830 uc.appendLog(ch.Name, msg)
831 }
832 }
833
834 if msg.Prefix.Name != uc.nick {
835 uc.forEachDownstream(func(dc *downstreamConn) {
836 dc.SendMessage(dc.marshalMessage(msg, uc.network))
837 })
838 }
839 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
840 var name, topic string
841 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
842 return err
843 }
844 ch, err := uc.getChannel(name)
845 if err != nil {
846 return err
847 }
848 if msg.Command == irc.RPL_TOPIC {
849 ch.Topic = topic
850 } else {
851 ch.Topic = ""
852 }
853 case "TOPIC":
854 if msg.Prefix == nil {
855 return fmt.Errorf("expected a prefix")
856 }
857
858 var name string
859 if err := parseMessageParams(msg, &name); err != nil {
860 return err
861 }
862 ch, err := uc.getChannel(name)
863 if err != nil {
864 return err
865 }
866 if len(msg.Params) > 1 {
867 ch.Topic = msg.Params[1]
868 ch.TopicWho = msg.Prefix.Copy()
869 ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
870 } else {
871 ch.Topic = ""
872 }
873 uc.produce(ch.Name, msg, nil)
874 case "MODE":
875 var name, modeStr string
876 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
877 return err
878 }
879
880 if !uc.isChannel(name) { // user mode change
881 if name != uc.nick {
882 return fmt.Errorf("received MODE message for unknown nick %q", name)
883 }
884 return uc.modes.Apply(modeStr)
885 // TODO: notify downstreams about user mode change?
886 } else { // channel mode change
887 ch, err := uc.getChannel(name)
888 if err != nil {
889 return err
890 }
891
892 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
893 if err != nil {
894 return err
895 }
896
897 uc.appendLog(ch.Name, msg)
898
899 if ch, ok := uc.network.channels[name]; !ok || !ch.Detached {
900 uc.forEachDownstream(func(dc *downstreamConn) {
901 params := make([]string, len(msg.Params))
902 params[0] = dc.marshalEntity(uc.network, name)
903 params[1] = modeStr
904
905 copy(params[2:], msg.Params[2:])
906 for i, modeParam := range params[2:] {
907 if _, ok := needMarshaling[i]; ok {
908 params[2+i] = dc.marshalEntity(uc.network, modeParam)
909 }
910 }
911
912 dc.SendMessage(&irc.Message{
913 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
914 Command: "MODE",
915 Params: params,
916 })
917 })
918 }
919 }
920 case irc.RPL_UMODEIS:
921 if err := parseMessageParams(msg, nil); err != nil {
922 return err
923 }
924 modeStr := ""
925 if len(msg.Params) > 1 {
926 modeStr = msg.Params[1]
927 }
928
929 uc.modes = ""
930 if err := uc.modes.Apply(modeStr); err != nil {
931 return err
932 }
933 // TODO: send RPL_UMODEIS to downstream connections when applicable
934 case irc.RPL_CHANNELMODEIS:
935 var channel string
936 if err := parseMessageParams(msg, nil, &channel); err != nil {
937 return err
938 }
939 modeStr := ""
940 if len(msg.Params) > 2 {
941 modeStr = msg.Params[2]
942 }
943
944 ch, err := uc.getChannel(channel)
945 if err != nil {
946 return err
947 }
948
949 firstMode := ch.modes == nil
950 ch.modes = make(map[byte]string)
951 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
952 return err
953 }
954 if firstMode {
955 if c, ok := uc.network.channels[channel]; !ok || !c.Detached {
956 modeStr, modeParams := ch.modes.Format()
957
958 uc.forEachDownstream(func(dc *downstreamConn) {
959 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
960 params = append(params, modeParams...)
961
962 dc.SendMessage(&irc.Message{
963 Prefix: dc.srv.prefix(),
964 Command: irc.RPL_CHANNELMODEIS,
965 Params: params,
966 })
967 })
968 }
969 }
970 case rpl_creationtime:
971 var channel, creationTime string
972 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
973 return err
974 }
975
976 ch, err := uc.getChannel(channel)
977 if err != nil {
978 return err
979 }
980
981 firstCreationTime := ch.creationTime == ""
982 ch.creationTime = creationTime
983 if firstCreationTime {
984 uc.forEachDownstream(func(dc *downstreamConn) {
985 dc.SendMessage(&irc.Message{
986 Prefix: dc.srv.prefix(),
987 Command: rpl_creationtime,
988 Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
989 })
990 })
991 }
992 case rpl_topicwhotime:
993 var name, who, timeStr string
994 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
995 return err
996 }
997 ch, err := uc.getChannel(name)
998 if err != nil {
999 return err
1000 }
1001 firstTopicWhoTime := ch.TopicWho == nil
1002 ch.TopicWho = irc.ParsePrefix(who)
1003 sec, err := strconv.ParseInt(timeStr, 10, 64)
1004 if err != nil {
1005 return fmt.Errorf("failed to parse topic time: %v", err)
1006 }
1007 ch.TopicTime = time.Unix(sec, 0)
1008 if firstTopicWhoTime {
1009 uc.forEachDownstream(func(dc *downstreamConn) {
1010 topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
1011 dc.SendMessage(&irc.Message{
1012 Prefix: dc.srv.prefix(),
1013 Command: rpl_topicwhotime,
1014 Params: []string{
1015 dc.nick,
1016 dc.marshalEntity(uc.network, ch.Name),
1017 topicWho.String(),
1018 timeStr,
1019 },
1020 })
1021 })
1022 }
1023 case irc.RPL_LIST:
1024 var channel, clients, topic string
1025 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
1026 return err
1027 }
1028
1029 pl := uc.getPendingLIST()
1030 if pl == nil {
1031 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
1032 }
1033
1034 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
1035 dc.SendMessage(&irc.Message{
1036 Prefix: dc.srv.prefix(),
1037 Command: irc.RPL_LIST,
1038 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
1039 })
1040 })
1041 case irc.RPL_LISTEND:
1042 ok := uc.endPendingLISTs(false)
1043 if !ok {
1044 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
1045 }
1046 case irc.RPL_NAMREPLY:
1047 var name, statusStr, members string
1048 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
1049 return err
1050 }
1051
1052 ch, ok := uc.channels[name]
1053 if !ok {
1054 // NAMES on a channel we have not joined, forward to downstream
1055 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1056 channel := dc.marshalEntity(uc.network, name)
1057 members := splitSpace(members)
1058 for i, member := range members {
1059 memberships, nick := uc.parseMembershipPrefix(member)
1060 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1061 }
1062 memberStr := strings.Join(members, " ")
1063
1064 dc.SendMessage(&irc.Message{
1065 Prefix: dc.srv.prefix(),
1066 Command: irc.RPL_NAMREPLY,
1067 Params: []string{dc.nick, statusStr, channel, memberStr},
1068 })
1069 })
1070 return nil
1071 }
1072
1073 status, err := parseChannelStatus(statusStr)
1074 if err != nil {
1075 return err
1076 }
1077 ch.Status = status
1078
1079 for _, s := range splitSpace(members) {
1080 memberships, nick := uc.parseMembershipPrefix(s)
1081 ch.Members[nick] = memberships
1082 }
1083 case irc.RPL_ENDOFNAMES:
1084 var name string
1085 if err := parseMessageParams(msg, nil, &name); err != nil {
1086 return err
1087 }
1088
1089 ch, ok := uc.channels[name]
1090 if !ok {
1091 // NAMES on a channel we have not joined, forward to downstream
1092 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1093 channel := dc.marshalEntity(uc.network, name)
1094
1095 dc.SendMessage(&irc.Message{
1096 Prefix: dc.srv.prefix(),
1097 Command: irc.RPL_ENDOFNAMES,
1098 Params: []string{dc.nick, channel, "End of /NAMES list"},
1099 })
1100 })
1101 return nil
1102 }
1103
1104 if ch.complete {
1105 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1106 }
1107 ch.complete = true
1108
1109 if c, ok := uc.network.channels[name]; !ok || !c.Detached {
1110 uc.forEachDownstream(func(dc *downstreamConn) {
1111 forwardChannel(dc, ch)
1112 })
1113 }
1114 case irc.RPL_WHOREPLY:
1115 var channel, username, host, server, nick, mode, trailing string
1116 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1117 return err
1118 }
1119
1120 parts := strings.SplitN(trailing, " ", 2)
1121 if len(parts) != 2 {
1122 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1123 }
1124 realname := parts[1]
1125 hops, err := strconv.Atoi(parts[0])
1126 if err != nil {
1127 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1128 }
1129 hops++
1130
1131 trailing = strconv.Itoa(hops) + " " + realname
1132
1133 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1134 channel := channel
1135 if channel != "*" {
1136 channel = dc.marshalEntity(uc.network, channel)
1137 }
1138 nick := dc.marshalEntity(uc.network, nick)
1139 dc.SendMessage(&irc.Message{
1140 Prefix: dc.srv.prefix(),
1141 Command: irc.RPL_WHOREPLY,
1142 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1143 })
1144 })
1145 case irc.RPL_ENDOFWHO:
1146 var name string
1147 if err := parseMessageParams(msg, nil, &name); err != nil {
1148 return err
1149 }
1150
1151 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1152 name := name
1153 if name != "*" {
1154 // TODO: support WHO masks
1155 name = dc.marshalEntity(uc.network, name)
1156 }
1157 dc.SendMessage(&irc.Message{
1158 Prefix: dc.srv.prefix(),
1159 Command: irc.RPL_ENDOFWHO,
1160 Params: []string{dc.nick, name, "End of /WHO list"},
1161 })
1162 })
1163 case irc.RPL_WHOISUSER:
1164 var nick, username, host, realname string
1165 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1166 return err
1167 }
1168
1169 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1170 nick := dc.marshalEntity(uc.network, nick)
1171 dc.SendMessage(&irc.Message{
1172 Prefix: dc.srv.prefix(),
1173 Command: irc.RPL_WHOISUSER,
1174 Params: []string{dc.nick, nick, username, host, "*", realname},
1175 })
1176 })
1177 case irc.RPL_WHOISSERVER:
1178 var nick, server, serverInfo string
1179 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1180 return err
1181 }
1182
1183 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1184 nick := dc.marshalEntity(uc.network, nick)
1185 dc.SendMessage(&irc.Message{
1186 Prefix: dc.srv.prefix(),
1187 Command: irc.RPL_WHOISSERVER,
1188 Params: []string{dc.nick, nick, server, serverInfo},
1189 })
1190 })
1191 case irc.RPL_WHOISOPERATOR:
1192 var nick string
1193 if err := parseMessageParams(msg, nil, &nick); err != nil {
1194 return err
1195 }
1196
1197 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1198 nick := dc.marshalEntity(uc.network, nick)
1199 dc.SendMessage(&irc.Message{
1200 Prefix: dc.srv.prefix(),
1201 Command: irc.RPL_WHOISOPERATOR,
1202 Params: []string{dc.nick, nick, "is an IRC operator"},
1203 })
1204 })
1205 case irc.RPL_WHOISIDLE:
1206 var nick string
1207 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1208 return err
1209 }
1210
1211 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1212 nick := dc.marshalEntity(uc.network, nick)
1213 params := []string{dc.nick, nick}
1214 params = append(params, msg.Params[2:]...)
1215 dc.SendMessage(&irc.Message{
1216 Prefix: dc.srv.prefix(),
1217 Command: irc.RPL_WHOISIDLE,
1218 Params: params,
1219 })
1220 })
1221 case irc.RPL_WHOISCHANNELS:
1222 var nick, channelList string
1223 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1224 return err
1225 }
1226 channels := splitSpace(channelList)
1227
1228 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1229 nick := dc.marshalEntity(uc.network, nick)
1230 channelList := make([]string, len(channels))
1231 for i, channel := range channels {
1232 prefix, channel := uc.parseMembershipPrefix(channel)
1233 channel = dc.marshalEntity(uc.network, channel)
1234 channelList[i] = prefix.Format(dc) + channel
1235 }
1236 channels := strings.Join(channelList, " ")
1237 dc.SendMessage(&irc.Message{
1238 Prefix: dc.srv.prefix(),
1239 Command: irc.RPL_WHOISCHANNELS,
1240 Params: []string{dc.nick, nick, channels},
1241 })
1242 })
1243 case irc.RPL_ENDOFWHOIS:
1244 var nick string
1245 if err := parseMessageParams(msg, nil, &nick); err != nil {
1246 return err
1247 }
1248
1249 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1250 nick := dc.marshalEntity(uc.network, nick)
1251 dc.SendMessage(&irc.Message{
1252 Prefix: dc.srv.prefix(),
1253 Command: irc.RPL_ENDOFWHOIS,
1254 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1255 })
1256 })
1257 case "INVITE":
1258 var nick, channel string
1259 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1260 return err
1261 }
1262
1263 weAreInvited := nick == uc.nick
1264
1265 uc.forEachDownstream(func(dc *downstreamConn) {
1266 if !weAreInvited && !dc.caps["invite-notify"] {
1267 return
1268 }
1269 dc.SendMessage(&irc.Message{
1270 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1271 Command: "INVITE",
1272 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1273 })
1274 })
1275 case irc.RPL_INVITING:
1276 var nick, channel string
1277 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1278 return err
1279 }
1280
1281 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1282 dc.SendMessage(&irc.Message{
1283 Prefix: dc.srv.prefix(),
1284 Command: irc.RPL_INVITING,
1285 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1286 })
1287 })
1288 case irc.RPL_AWAY:
1289 var nick, reason string
1290 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1291 return err
1292 }
1293
1294 uc.forEachDownstream(func(dc *downstreamConn) {
1295 dc.SendMessage(&irc.Message{
1296 Prefix: dc.srv.prefix(),
1297 Command: irc.RPL_AWAY,
1298 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1299 })
1300 })
1301 case "AWAY":
1302 if msg.Prefix == nil {
1303 return fmt.Errorf("expected a prefix")
1304 }
1305
1306 uc.forEachDownstream(func(dc *downstreamConn) {
1307 if !dc.caps["away-notify"] {
1308 return
1309 }
1310 dc.SendMessage(&irc.Message{
1311 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1312 Command: "AWAY",
1313 Params: msg.Params,
1314 })
1315 })
1316 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1317 var channel, mask string
1318 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1319 return err
1320 }
1321 var addNick, addTime string
1322 if len(msg.Params) >= 5 {
1323 addNick = msg.Params[3]
1324 addTime = msg.Params[4]
1325 }
1326
1327 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1328 channel := dc.marshalEntity(uc.network, channel)
1329
1330 var params []string
1331 if addNick != "" && addTime != "" {
1332 addNick := dc.marshalEntity(uc.network, addNick)
1333 params = []string{dc.nick, channel, mask, addNick, addTime}
1334 } else {
1335 params = []string{dc.nick, channel, mask}
1336 }
1337
1338 dc.SendMessage(&irc.Message{
1339 Prefix: dc.srv.prefix(),
1340 Command: msg.Command,
1341 Params: params,
1342 })
1343 })
1344 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1345 var channel, trailing string
1346 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1347 return err
1348 }
1349
1350 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1351 upstreamChannel := dc.marshalEntity(uc.network, channel)
1352 dc.SendMessage(&irc.Message{
1353 Prefix: dc.srv.prefix(),
1354 Command: msg.Command,
1355 Params: []string{dc.nick, upstreamChannel, trailing},
1356 })
1357 })
1358 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1359 var command, reason string
1360 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1361 return err
1362 }
1363
1364 if command == "LIST" {
1365 ok := uc.endPendingLISTs(false)
1366 if !ok {
1367 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1368 }
1369 }
1370
1371 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1372 dc.SendMessage(&irc.Message{
1373 Prefix: uc.srv.prefix(),
1374 Command: msg.Command,
1375 Params: []string{dc.nick, command, reason},
1376 })
1377 })
1378 case "ACK":
1379 // Ignore
1380 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1381 // Ignore
1382 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1383 // Ignore
1384 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1385 // Ignore
1386 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1387 // Ignore
1388 case irc.RPL_LISTSTART:
1389 // Ignore
1390 case rpl_localusers, rpl_globalusers:
1391 // Ignore
1392 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1393 // Ignore
1394 case "ERROR":
1395 var text string
1396 if err := parseMessageParams(msg, &text); err != nil {
1397 return err
1398 }
1399 return fmt.Errorf("fatal server error: %v", text)
1400 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
1401 if !uc.registered {
1402 text := msg.Params[len(msg.Params)-1]
1403 return registrationError(text)
1404 }
1405 fallthrough
1406 default:
1407 uc.logger.Printf("unhandled message: %v", msg)
1408
1409 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1410 // best effort marshaling for unknown messages, replies and errors:
1411 // most numerics start with the user nick, marshal it if that's the case
1412 // otherwise, conservately keep the params without marshaling
1413 params := msg.Params
1414 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1415 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1416 params[0] = dc.nick
1417 }
1418 }
1419 dc.SendMessage(&irc.Message{
1420 Prefix: uc.srv.prefix(),
1421 Command: msg.Command,
1422 Params: params,
1423 })
1424 })
1425 }
1426 return nil
1427}
1428
1429func (uc *upstreamConn) handleDetachedMessage(sender string, text string, ch *Channel) {
1430 highlight := sender != uc.nick && isHighlight(text, uc.nick)
1431 if ch.RelayDetached == FilterMessage || ((ch.RelayDetached == FilterHighlight || ch.RelayDetached == FilterDefault) && highlight) {
1432 uc.forEachDownstream(func(dc *downstreamConn) {
1433 if highlight {
1434 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1435 } else {
1436 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1437 }
1438 })
1439 }
1440 if ch.ReattachOn == FilterMessage || (ch.ReattachOn == FilterHighlight && highlight) {
1441 uc.network.attach(ch)
1442 if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1443 uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
1444 }
1445 }
1446}
1447
1448func (uc *upstreamConn) handleChanModes(s string) error {
1449 parts := strings.SplitN(s, ",", 5)
1450 if len(parts) < 4 {
1451 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
1452 }
1453 modes := make(map[byte]channelModeType)
1454 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
1455 for j := 0; j < len(parts[i]); j++ {
1456 mode := parts[i][j]
1457 modes[mode] = mt
1458 }
1459 }
1460 uc.availableChannelModes = modes
1461 return nil
1462}
1463
1464func (uc *upstreamConn) handleMemberships(s string) error {
1465 if s == "" {
1466 uc.availableMemberships = nil
1467 return nil
1468 }
1469
1470 if s[0] != '(' {
1471 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1472 }
1473 sep := strings.IndexByte(s, ')')
1474 if sep < 0 || len(s) != sep*2 {
1475 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1476 }
1477 memberships := make([]membership, len(s)/2-1)
1478 for i := range memberships {
1479 memberships[i] = membership{
1480 Mode: s[i+1],
1481 Prefix: s[sep+i+1],
1482 }
1483 }
1484 uc.availableMemberships = memberships
1485 return nil
1486}
1487
1488func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1489 caps := strings.Fields(capsStr)
1490 for _, s := range caps {
1491 kv := strings.SplitN(s, "=", 2)
1492 k := strings.ToLower(kv[0])
1493 var v string
1494 if len(kv) == 2 {
1495 v = kv[1]
1496 }
1497 uc.supportedCaps[k] = v
1498 }
1499}
1500
1501func (uc *upstreamConn) requestCaps() {
1502 var requestCaps []string
1503 for c := range permanentUpstreamCaps {
1504 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1505 requestCaps = append(requestCaps, c)
1506 }
1507 }
1508
1509 if uc.requestSASL() && !uc.caps["sasl"] {
1510 requestCaps = append(requestCaps, "sasl")
1511 }
1512
1513 if len(requestCaps) == 0 {
1514 return
1515 }
1516
1517 uc.SendMessage(&irc.Message{
1518 Command: "CAP",
1519 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1520 })
1521}
1522
1523func (uc *upstreamConn) requestSASL() bool {
1524 if uc.network.SASL.Mechanism == "" {
1525 return false
1526 }
1527
1528 v, ok := uc.supportedCaps["sasl"]
1529 if !ok {
1530 return false
1531 }
1532 if v != "" {
1533 mechanisms := strings.Split(v, ",")
1534 found := false
1535 for _, mech := range mechanisms {
1536 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1537 found = true
1538 break
1539 }
1540 }
1541 if !found {
1542 return false
1543 }
1544 }
1545
1546 return true
1547}
1548
1549func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1550 uc.caps[name] = ok
1551
1552 switch name {
1553 case "sasl":
1554 if !ok {
1555 uc.logger.Printf("server refused to acknowledge the SASL capability")
1556 return nil
1557 }
1558
1559 auth := &uc.network.SASL
1560 switch auth.Mechanism {
1561 case "PLAIN":
1562 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1563 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1564 case "EXTERNAL":
1565 uc.logger.Printf("starting SASL EXTERNAL authentication")
1566 uc.saslClient = sasl.NewExternalClient("")
1567 default:
1568 return fmt.Errorf("unsupported SASL mechanism %q", name)
1569 }
1570
1571 uc.SendMessage(&irc.Message{
1572 Command: "AUTHENTICATE",
1573 Params: []string{auth.Mechanism},
1574 })
1575 default:
1576 if permanentUpstreamCaps[name] {
1577 break
1578 }
1579 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1580 }
1581 return nil
1582}
1583
1584func splitSpace(s string) []string {
1585 return strings.FieldsFunc(s, func(r rune) bool {
1586 return r == ' '
1587 })
1588}
1589
1590func (uc *upstreamConn) register() {
1591 uc.nick = uc.network.Nick
1592 uc.username = uc.network.GetUsername()
1593 uc.realname = uc.network.GetRealname()
1594
1595 uc.SendMessage(&irc.Message{
1596 Command: "CAP",
1597 Params: []string{"LS", "302"},
1598 })
1599
1600 if uc.network.Pass != "" {
1601 uc.SendMessage(&irc.Message{
1602 Command: "PASS",
1603 Params: []string{uc.network.Pass},
1604 })
1605 }
1606
1607 uc.SendMessage(&irc.Message{
1608 Command: "NICK",
1609 Params: []string{uc.nick},
1610 })
1611 uc.SendMessage(&irc.Message{
1612 Command: "USER",
1613 Params: []string{uc.username, "0", "*", uc.realname},
1614 })
1615}
1616
1617func (uc *upstreamConn) runUntilRegistered() error {
1618 for !uc.registered {
1619 msg, err := uc.ReadMessage()
1620 if err != nil {
1621 return fmt.Errorf("failed to read message: %v", err)
1622 }
1623
1624 if err := uc.handleMessage(msg); err != nil {
1625 if _, ok := err.(registrationError); ok {
1626 return err
1627 } else {
1628 msg.Tags = nil // prevent message tags from cluttering logs
1629 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1630 }
1631 }
1632 }
1633
1634 for _, command := range uc.network.ConnectCommands {
1635 m, err := irc.ParseMessage(command)
1636 if err != nil {
1637 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1638 } else {
1639 uc.SendMessage(m)
1640 }
1641 }
1642
1643 return nil
1644}
1645
1646func (uc *upstreamConn) readMessages(ch chan<- event) error {
1647 for {
1648 msg, err := uc.ReadMessage()
1649 if err == io.EOF {
1650 break
1651 } else if err != nil {
1652 return fmt.Errorf("failed to read IRC command: %v", err)
1653 }
1654
1655 ch <- eventUpstreamMessage{msg, uc}
1656 }
1657
1658 return nil
1659}
1660
1661func (uc *upstreamConn) SendMessage(msg *irc.Message) {
1662 if !uc.caps["message-tags"] {
1663 msg = msg.Copy()
1664 msg.Tags = nil
1665 }
1666
1667 uc.conn.SendMessage(msg)
1668}
1669
1670func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1671 if uc.caps["labeled-response"] {
1672 if msg.Tags == nil {
1673 msg.Tags = make(map[string]irc.TagValue)
1674 }
1675 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1676 uc.nextLabelID++
1677 }
1678 uc.SendMessage(msg)
1679}
1680
1681// appendLog appends a message to the log file.
1682//
1683// The internal message ID is returned. If the message isn't recorded in the
1684// log file, an empty string is returned.
1685func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string) {
1686 if uc.user.msgStore == nil {
1687 return ""
1688 }
1689
1690 detached := false
1691 if ch, ok := uc.network.channels[entity]; ok {
1692 detached = ch.Detached
1693 }
1694
1695 delivered, ok := uc.network.delivered[entity]
1696 if !ok {
1697 lastID, err := uc.user.msgStore.LastMsgID(uc.network, entity, time.Now())
1698 if err != nil {
1699 uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
1700 return ""
1701 }
1702
1703 delivered = make(map[string]string)
1704 uc.network.delivered[entity] = delivered
1705
1706 for clientName, _ := range uc.network.offlineClients {
1707 delivered[clientName] = lastID
1708 }
1709
1710 if detached {
1711 // If the channel is detached, online clients act as offline
1712 // clients too
1713 uc.forEachDownstream(func(dc *downstreamConn) {
1714 delivered[dc.clientName] = lastID
1715 })
1716 }
1717 }
1718
1719 msgID, err := uc.user.msgStore.Append(uc.network, entity, msg)
1720 if err != nil {
1721 uc.logger.Printf("failed to log message: %v", err)
1722 return ""
1723 }
1724
1725 return msgID
1726}
1727
1728// produce appends a message to the logs and forwards it to connected downstream
1729// connections.
1730//
1731// If origin is not nil and origin doesn't support echo-message, the message is
1732// forwarded to all connections except origin.
1733func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1734 var msgID string
1735 if target != "" {
1736 msgID = uc.appendLog(target, msg)
1737 }
1738
1739 // Don't forward messages if it's a detached channel
1740 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1741 return
1742 }
1743
1744 uc.forEachDownstream(func(dc *downstreamConn) {
1745 if dc != origin || dc.caps["echo-message"] {
1746 dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
1747 } else {
1748 dc.advanceMessageWithID(msg, msgID)
1749 }
1750 })
1751}
1752
1753func (uc *upstreamConn) updateAway() {
1754 away := true
1755 uc.forEachDownstream(func(*downstreamConn) {
1756 away = false
1757 })
1758 if away == uc.away {
1759 return
1760 }
1761 if away {
1762 uc.SendMessage(&irc.Message{
1763 Command: "AWAY",
1764 Params: []string{"Auto away"},
1765 })
1766 } else {
1767 uc.SendMessage(&irc.Message{
1768 Command: "AWAY",
1769 })
1770 }
1771 uc.away = away
1772}
1773
1774func (uc *upstreamConn) updateChannelAutoDetach(name string) {
1775 if uch, ok := uc.channels[name]; ok {
1776 if ch, ok := uc.network.channels[name]; ok && !ch.Detached {
1777 uch.updateAutoDetach(ch.DetachAfter)
1778 }
1779 }
1780}
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