source: code/trunk/upstream.go@ 461

Last change on this file since 461 was 461, checked in by contact, 4 years ago

Use upstream ISUPPORT map for NETWORK
File size: 44.5 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 if !negate && hasValue {
638 // TODO: reset to defaults when the token is negated
639 switch parameter {
640 case "CHANMODES":
641 if err := uc.handleChanModes(value); err != nil {
642 return err
643 }
644 case "CHANTYPES":
645 uc.availableChannelTypes = value
646 case "PREFIX":
647 if err := uc.handleMemberships(value); err != nil {
648 return err
649 }
650 }
651 }
652 }
653 case "BATCH":
654 var tag string
655 if err := parseMessageParams(msg, &tag); err != nil {
656 return err
657 }
658
659 if strings.HasPrefix(tag, "+") {
660 tag = tag[1:]
661 if _, ok := uc.batches[tag]; ok {
662 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
663 }
664 var batchType string
665 if err := parseMessageParams(msg, nil, &batchType); err != nil {
666 return err
667 }
668 label := label
669 if label == "" && msgBatch != nil {
670 label = msgBatch.Label
671 }
672 uc.batches[tag] = batch{
673 Type: batchType,
674 Params: msg.Params[2:],
675 Outer: msgBatch,
676 Label: label,
677 }
678 } else if strings.HasPrefix(tag, "-") {
679 tag = tag[1:]
680 if _, ok := uc.batches[tag]; !ok {
681 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
682 }
683 delete(uc.batches, tag)
684 } else {
685 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
686 }
687 case "NICK":
688 if msg.Prefix == nil {
689 return fmt.Errorf("expected a prefix")
690 }
691
692 var newNick string
693 if err := parseMessageParams(msg, &newNick); err != nil {
694 return err
695 }
696
697 me := false
698 if msg.Prefix.Name == uc.nick {
699 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
700 me = true
701 uc.nick = newNick
702 }
703
704 for _, ch := range uc.channels {
705 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
706 delete(ch.Members, msg.Prefix.Name)
707 ch.Members[newNick] = memberships
708 uc.appendLog(ch.Name, msg)
709 }
710 }
711
712 if !me {
713 uc.forEachDownstream(func(dc *downstreamConn) {
714 dc.SendMessage(dc.marshalMessage(msg, uc.network))
715 })
716 } else {
717 uc.forEachDownstream(func(dc *downstreamConn) {
718 dc.updateNick()
719 })
720 }
721 case "JOIN":
722 if msg.Prefix == nil {
723 return fmt.Errorf("expected a prefix")
724 }
725
726 var channels string
727 if err := parseMessageParams(msg, &channels); err != nil {
728 return err
729 }
730
731 for _, ch := range strings.Split(channels, ",") {
732 if msg.Prefix.Name == uc.nick {
733 uc.logger.Printf("joined channel %q", ch)
734 uc.channels[ch] = &upstreamChannel{
735 Name: ch,
736 conn: uc,
737 Members: make(map[string]*memberships),
738 }
739 uc.updateChannelAutoDetach(ch)
740
741 uc.SendMessage(&irc.Message{
742 Command: "MODE",
743 Params: []string{ch},
744 })
745 } else {
746 ch, err := uc.getChannel(ch)
747 if err != nil {
748 return err
749 }
750 ch.Members[msg.Prefix.Name] = &memberships{}
751 }
752
753 chMsg := msg.Copy()
754 chMsg.Params[0] = ch
755 uc.produce(ch, chMsg, nil)
756 }
757 case "PART":
758 if msg.Prefix == nil {
759 return fmt.Errorf("expected a prefix")
760 }
761
762 var channels string
763 if err := parseMessageParams(msg, &channels); err != nil {
764 return err
765 }
766
767 for _, ch := range strings.Split(channels, ",") {
768 if msg.Prefix.Name == uc.nick {
769 uc.logger.Printf("parted channel %q", ch)
770 if uch, ok := uc.channels[ch]; ok {
771 delete(uc.channels, ch)
772 uch.updateAutoDetach(0)
773 }
774 } else {
775 ch, err := uc.getChannel(ch)
776 if err != nil {
777 return err
778 }
779 delete(ch.Members, msg.Prefix.Name)
780 }
781
782 chMsg := msg.Copy()
783 chMsg.Params[0] = ch
784 uc.produce(ch, chMsg, nil)
785 }
786 case "KICK":
787 if msg.Prefix == nil {
788 return fmt.Errorf("expected a prefix")
789 }
790
791 var channel, user string
792 if err := parseMessageParams(msg, &channel, &user); err != nil {
793 return err
794 }
795
796 if user == uc.nick {
797 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
798 delete(uc.channels, channel)
799 } else {
800 ch, err := uc.getChannel(channel)
801 if err != nil {
802 return err
803 }
804 delete(ch.Members, user)
805 }
806
807 uc.produce(channel, msg, nil)
808 case "QUIT":
809 if msg.Prefix == nil {
810 return fmt.Errorf("expected a prefix")
811 }
812
813 if msg.Prefix.Name == uc.nick {
814 uc.logger.Printf("quit")
815 }
816
817 for _, ch := range uc.channels {
818 if _, ok := ch.Members[msg.Prefix.Name]; ok {
819 delete(ch.Members, msg.Prefix.Name)
820
821 uc.appendLog(ch.Name, msg)
822 }
823 }
824
825 if msg.Prefix.Name != uc.nick {
826 uc.forEachDownstream(func(dc *downstreamConn) {
827 dc.SendMessage(dc.marshalMessage(msg, uc.network))
828 })
829 }
830 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
831 var name, topic string
832 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
833 return err
834 }
835 ch, err := uc.getChannel(name)
836 if err != nil {
837 return err
838 }
839 if msg.Command == irc.RPL_TOPIC {
840 ch.Topic = topic
841 } else {
842 ch.Topic = ""
843 }
844 case "TOPIC":
845 if msg.Prefix == nil {
846 return fmt.Errorf("expected a prefix")
847 }
848
849 var name string
850 if err := parseMessageParams(msg, &name); err != nil {
851 return err
852 }
853 ch, err := uc.getChannel(name)
854 if err != nil {
855 return err
856 }
857 if len(msg.Params) > 1 {
858 ch.Topic = msg.Params[1]
859 ch.TopicWho = msg.Prefix.Copy()
860 ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
861 } else {
862 ch.Topic = ""
863 }
864 uc.produce(ch.Name, msg, nil)
865 case "MODE":
866 var name, modeStr string
867 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
868 return err
869 }
870
871 if !uc.isChannel(name) { // user mode change
872 if name != uc.nick {
873 return fmt.Errorf("received MODE message for unknown nick %q", name)
874 }
875 return uc.modes.Apply(modeStr)
876 // TODO: notify downstreams about user mode change?
877 } else { // channel mode change
878 ch, err := uc.getChannel(name)
879 if err != nil {
880 return err
881 }
882
883 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
884 if err != nil {
885 return err
886 }
887
888 uc.appendLog(ch.Name, msg)
889
890 if ch, ok := uc.network.channels[name]; !ok || !ch.Detached {
891 uc.forEachDownstream(func(dc *downstreamConn) {
892 params := make([]string, len(msg.Params))
893 params[0] = dc.marshalEntity(uc.network, name)
894 params[1] = modeStr
895
896 copy(params[2:], msg.Params[2:])
897 for i, modeParam := range params[2:] {
898 if _, ok := needMarshaling[i]; ok {
899 params[2+i] = dc.marshalEntity(uc.network, modeParam)
900 }
901 }
902
903 dc.SendMessage(&irc.Message{
904 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
905 Command: "MODE",
906 Params: params,
907 })
908 })
909 }
910 }
911 case irc.RPL_UMODEIS:
912 if err := parseMessageParams(msg, nil); err != nil {
913 return err
914 }
915 modeStr := ""
916 if len(msg.Params) > 1 {
917 modeStr = msg.Params[1]
918 }
919
920 uc.modes = ""
921 if err := uc.modes.Apply(modeStr); err != nil {
922 return err
923 }
924 // TODO: send RPL_UMODEIS to downstream connections when applicable
925 case irc.RPL_CHANNELMODEIS:
926 var channel string
927 if err := parseMessageParams(msg, nil, &channel); err != nil {
928 return err
929 }
930 modeStr := ""
931 if len(msg.Params) > 2 {
932 modeStr = msg.Params[2]
933 }
934
935 ch, err := uc.getChannel(channel)
936 if err != nil {
937 return err
938 }
939
940 firstMode := ch.modes == nil
941 ch.modes = make(map[byte]string)
942 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
943 return err
944 }
945 if firstMode {
946 if c, ok := uc.network.channels[channel]; !ok || !c.Detached {
947 modeStr, modeParams := ch.modes.Format()
948
949 uc.forEachDownstream(func(dc *downstreamConn) {
950 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
951 params = append(params, modeParams...)
952
953 dc.SendMessage(&irc.Message{
954 Prefix: dc.srv.prefix(),
955 Command: irc.RPL_CHANNELMODEIS,
956 Params: params,
957 })
958 })
959 }
960 }
961 case rpl_creationtime:
962 var channel, creationTime string
963 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
964 return err
965 }
966
967 ch, err := uc.getChannel(channel)
968 if err != nil {
969 return err
970 }
971
972 firstCreationTime := ch.creationTime == ""
973 ch.creationTime = creationTime
974 if firstCreationTime {
975 uc.forEachDownstream(func(dc *downstreamConn) {
976 dc.SendMessage(&irc.Message{
977 Prefix: dc.srv.prefix(),
978 Command: rpl_creationtime,
979 Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
980 })
981 })
982 }
983 case rpl_topicwhotime:
984 var name, who, timeStr string
985 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
986 return err
987 }
988 ch, err := uc.getChannel(name)
989 if err != nil {
990 return err
991 }
992 firstTopicWhoTime := ch.TopicWho == nil
993 ch.TopicWho = irc.ParsePrefix(who)
994 sec, err := strconv.ParseInt(timeStr, 10, 64)
995 if err != nil {
996 return fmt.Errorf("failed to parse topic time: %v", err)
997 }
998 ch.TopicTime = time.Unix(sec, 0)
999 if firstTopicWhoTime {
1000 uc.forEachDownstream(func(dc *downstreamConn) {
1001 topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
1002 dc.SendMessage(&irc.Message{
1003 Prefix: dc.srv.prefix(),
1004 Command: rpl_topicwhotime,
1005 Params: []string{
1006 dc.nick,
1007 dc.marshalEntity(uc.network, ch.Name),
1008 topicWho.String(),
1009 timeStr,
1010 },
1011 })
1012 })
1013 }
1014 case irc.RPL_LIST:
1015 var channel, clients, topic string
1016 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
1017 return err
1018 }
1019
1020 pl := uc.getPendingLIST()
1021 if pl == nil {
1022 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
1023 }
1024
1025 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
1026 dc.SendMessage(&irc.Message{
1027 Prefix: dc.srv.prefix(),
1028 Command: irc.RPL_LIST,
1029 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
1030 })
1031 })
1032 case irc.RPL_LISTEND:
1033 ok := uc.endPendingLISTs(false)
1034 if !ok {
1035 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
1036 }
1037 case irc.RPL_NAMREPLY:
1038 var name, statusStr, members string
1039 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
1040 return err
1041 }
1042
1043 ch, ok := uc.channels[name]
1044 if !ok {
1045 // NAMES on a channel we have not joined, forward to downstream
1046 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1047 channel := dc.marshalEntity(uc.network, name)
1048 members := splitSpace(members)
1049 for i, member := range members {
1050 memberships, nick := uc.parseMembershipPrefix(member)
1051 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1052 }
1053 memberStr := strings.Join(members, " ")
1054
1055 dc.SendMessage(&irc.Message{
1056 Prefix: dc.srv.prefix(),
1057 Command: irc.RPL_NAMREPLY,
1058 Params: []string{dc.nick, statusStr, channel, memberStr},
1059 })
1060 })
1061 return nil
1062 }
1063
1064 status, err := parseChannelStatus(statusStr)
1065 if err != nil {
1066 return err
1067 }
1068 ch.Status = status
1069
1070 for _, s := range splitSpace(members) {
1071 memberships, nick := uc.parseMembershipPrefix(s)
1072 ch.Members[nick] = memberships
1073 }
1074 case irc.RPL_ENDOFNAMES:
1075 var name string
1076 if err := parseMessageParams(msg, nil, &name); err != nil {
1077 return err
1078 }
1079
1080 ch, ok := uc.channels[name]
1081 if !ok {
1082 // NAMES on a channel we have not joined, forward to downstream
1083 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1084 channel := dc.marshalEntity(uc.network, name)
1085
1086 dc.SendMessage(&irc.Message{
1087 Prefix: dc.srv.prefix(),
1088 Command: irc.RPL_ENDOFNAMES,
1089 Params: []string{dc.nick, channel, "End of /NAMES list"},
1090 })
1091 })
1092 return nil
1093 }
1094
1095 if ch.complete {
1096 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1097 }
1098 ch.complete = true
1099
1100 if c, ok := uc.network.channels[name]; !ok || !c.Detached {
1101 uc.forEachDownstream(func(dc *downstreamConn) {
1102 forwardChannel(dc, ch)
1103 })
1104 }
1105 case irc.RPL_WHOREPLY:
1106 var channel, username, host, server, nick, mode, trailing string
1107 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1108 return err
1109 }
1110
1111 parts := strings.SplitN(trailing, " ", 2)
1112 if len(parts) != 2 {
1113 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1114 }
1115 realname := parts[1]
1116 hops, err := strconv.Atoi(parts[0])
1117 if err != nil {
1118 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1119 }
1120 hops++
1121
1122 trailing = strconv.Itoa(hops) + " " + realname
1123
1124 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1125 channel := channel
1126 if channel != "*" {
1127 channel = dc.marshalEntity(uc.network, channel)
1128 }
1129 nick := dc.marshalEntity(uc.network, nick)
1130 dc.SendMessage(&irc.Message{
1131 Prefix: dc.srv.prefix(),
1132 Command: irc.RPL_WHOREPLY,
1133 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1134 })
1135 })
1136 case irc.RPL_ENDOFWHO:
1137 var name string
1138 if err := parseMessageParams(msg, nil, &name); err != nil {
1139 return err
1140 }
1141
1142 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1143 name := name
1144 if name != "*" {
1145 // TODO: support WHO masks
1146 name = dc.marshalEntity(uc.network, name)
1147 }
1148 dc.SendMessage(&irc.Message{
1149 Prefix: dc.srv.prefix(),
1150 Command: irc.RPL_ENDOFWHO,
1151 Params: []string{dc.nick, name, "End of /WHO list"},
1152 })
1153 })
1154 case irc.RPL_WHOISUSER:
1155 var nick, username, host, realname string
1156 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1157 return err
1158 }
1159
1160 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1161 nick := dc.marshalEntity(uc.network, nick)
1162 dc.SendMessage(&irc.Message{
1163 Prefix: dc.srv.prefix(),
1164 Command: irc.RPL_WHOISUSER,
1165 Params: []string{dc.nick, nick, username, host, "*", realname},
1166 })
1167 })
1168 case irc.RPL_WHOISSERVER:
1169 var nick, server, serverInfo string
1170 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1171 return err
1172 }
1173
1174 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1175 nick := dc.marshalEntity(uc.network, nick)
1176 dc.SendMessage(&irc.Message{
1177 Prefix: dc.srv.prefix(),
1178 Command: irc.RPL_WHOISSERVER,
1179 Params: []string{dc.nick, nick, server, serverInfo},
1180 })
1181 })
1182 case irc.RPL_WHOISOPERATOR:
1183 var nick string
1184 if err := parseMessageParams(msg, nil, &nick); err != nil {
1185 return err
1186 }
1187
1188 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1189 nick := dc.marshalEntity(uc.network, nick)
1190 dc.SendMessage(&irc.Message{
1191 Prefix: dc.srv.prefix(),
1192 Command: irc.RPL_WHOISOPERATOR,
1193 Params: []string{dc.nick, nick, "is an IRC operator"},
1194 })
1195 })
1196 case irc.RPL_WHOISIDLE:
1197 var nick string
1198 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1199 return err
1200 }
1201
1202 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1203 nick := dc.marshalEntity(uc.network, nick)
1204 params := []string{dc.nick, nick}
1205 params = append(params, msg.Params[2:]...)
1206 dc.SendMessage(&irc.Message{
1207 Prefix: dc.srv.prefix(),
1208 Command: irc.RPL_WHOISIDLE,
1209 Params: params,
1210 })
1211 })
1212 case irc.RPL_WHOISCHANNELS:
1213 var nick, channelList string
1214 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1215 return err
1216 }
1217 channels := splitSpace(channelList)
1218
1219 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1220 nick := dc.marshalEntity(uc.network, nick)
1221 channelList := make([]string, len(channels))
1222 for i, channel := range channels {
1223 prefix, channel := uc.parseMembershipPrefix(channel)
1224 channel = dc.marshalEntity(uc.network, channel)
1225 channelList[i] = prefix.Format(dc) + channel
1226 }
1227 channels := strings.Join(channelList, " ")
1228 dc.SendMessage(&irc.Message{
1229 Prefix: dc.srv.prefix(),
1230 Command: irc.RPL_WHOISCHANNELS,
1231 Params: []string{dc.nick, nick, channels},
1232 })
1233 })
1234 case irc.RPL_ENDOFWHOIS:
1235 var nick string
1236 if err := parseMessageParams(msg, nil, &nick); err != nil {
1237 return err
1238 }
1239
1240 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1241 nick := dc.marshalEntity(uc.network, nick)
1242 dc.SendMessage(&irc.Message{
1243 Prefix: dc.srv.prefix(),
1244 Command: irc.RPL_ENDOFWHOIS,
1245 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1246 })
1247 })
1248 case "INVITE":
1249 var nick, channel string
1250 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1251 return err
1252 }
1253
1254 weAreInvited := nick == uc.nick
1255
1256 uc.forEachDownstream(func(dc *downstreamConn) {
1257 if !weAreInvited && !dc.caps["invite-notify"] {
1258 return
1259 }
1260 dc.SendMessage(&irc.Message{
1261 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1262 Command: "INVITE",
1263 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1264 })
1265 })
1266 case irc.RPL_INVITING:
1267 var nick, channel string
1268 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1269 return err
1270 }
1271
1272 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1273 dc.SendMessage(&irc.Message{
1274 Prefix: dc.srv.prefix(),
1275 Command: irc.RPL_INVITING,
1276 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1277 })
1278 })
1279 case irc.RPL_AWAY:
1280 var nick, reason string
1281 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1282 return err
1283 }
1284
1285 uc.forEachDownstream(func(dc *downstreamConn) {
1286 dc.SendMessage(&irc.Message{
1287 Prefix: dc.srv.prefix(),
1288 Command: irc.RPL_AWAY,
1289 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1290 })
1291 })
1292 case "AWAY":
1293 if msg.Prefix == nil {
1294 return fmt.Errorf("expected a prefix")
1295 }
1296
1297 uc.forEachDownstream(func(dc *downstreamConn) {
1298 if !dc.caps["away-notify"] {
1299 return
1300 }
1301 dc.SendMessage(&irc.Message{
1302 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1303 Command: "AWAY",
1304 Params: msg.Params,
1305 })
1306 })
1307 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1308 var channel, mask string
1309 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1310 return err
1311 }
1312 var addNick, addTime string
1313 if len(msg.Params) >= 5 {
1314 addNick = msg.Params[3]
1315 addTime = msg.Params[4]
1316 }
1317
1318 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1319 channel := dc.marshalEntity(uc.network, channel)
1320
1321 var params []string
1322 if addNick != "" && addTime != "" {
1323 addNick := dc.marshalEntity(uc.network, addNick)
1324 params = []string{dc.nick, channel, mask, addNick, addTime}
1325 } else {
1326 params = []string{dc.nick, channel, mask}
1327 }
1328
1329 dc.SendMessage(&irc.Message{
1330 Prefix: dc.srv.prefix(),
1331 Command: msg.Command,
1332 Params: params,
1333 })
1334 })
1335 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1336 var channel, trailing string
1337 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1338 return err
1339 }
1340
1341 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1342 upstreamChannel := dc.marshalEntity(uc.network, channel)
1343 dc.SendMessage(&irc.Message{
1344 Prefix: dc.srv.prefix(),
1345 Command: msg.Command,
1346 Params: []string{dc.nick, upstreamChannel, trailing},
1347 })
1348 })
1349 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1350 var command, reason string
1351 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1352 return err
1353 }
1354
1355 if command == "LIST" {
1356 ok := uc.endPendingLISTs(false)
1357 if !ok {
1358 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1359 }
1360 }
1361
1362 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1363 dc.SendMessage(&irc.Message{
1364 Prefix: uc.srv.prefix(),
1365 Command: msg.Command,
1366 Params: []string{dc.nick, command, reason},
1367 })
1368 })
1369 case "ACK":
1370 // Ignore
1371 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1372 // Ignore
1373 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1374 // Ignore
1375 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1376 // Ignore
1377 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1378 // Ignore
1379 case irc.RPL_LISTSTART:
1380 // Ignore
1381 case rpl_localusers, rpl_globalusers:
1382 // Ignore
1383 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1384 // Ignore
1385 case "ERROR":
1386 var text string
1387 if err := parseMessageParams(msg, &text); err != nil {
1388 return err
1389 }
1390 return fmt.Errorf("fatal server error: %v", text)
1391 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
1392 if !uc.registered {
1393 text := msg.Params[len(msg.Params)-1]
1394 return registrationError(text)
1395 }
1396 fallthrough
1397 default:
1398 uc.logger.Printf("unhandled message: %v", msg)
1399
1400 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1401 // best effort marshaling for unknown messages, replies and errors:
1402 // most numerics start with the user nick, marshal it if that's the case
1403 // otherwise, conservately keep the params without marshaling
1404 params := msg.Params
1405 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1406 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1407 params[0] = dc.nick
1408 }
1409 }
1410 dc.SendMessage(&irc.Message{
1411 Prefix: uc.srv.prefix(),
1412 Command: msg.Command,
1413 Params: params,
1414 })
1415 })
1416 }
1417 return nil
1418}
1419
1420func (uc *upstreamConn) handleDetachedMessage(sender string, text string, ch *Channel) {
1421 highlight := sender != uc.nick && isHighlight(text, uc.nick)
1422 if ch.RelayDetached == FilterMessage || ((ch.RelayDetached == FilterHighlight || ch.RelayDetached == FilterDefault) && highlight) {
1423 uc.forEachDownstream(func(dc *downstreamConn) {
1424 if highlight {
1425 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1426 } else {
1427 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
1428 }
1429 })
1430 }
1431 if ch.ReattachOn == FilterMessage || (ch.ReattachOn == FilterHighlight && highlight) {
1432 uc.network.attach(ch)
1433 if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1434 uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
1435 }
1436 }
1437}
1438
1439func (uc *upstreamConn) handleChanModes(s string) error {
1440 parts := strings.SplitN(s, ",", 5)
1441 if len(parts) < 4 {
1442 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
1443 }
1444 modes := make(map[byte]channelModeType)
1445 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
1446 for j := 0; j < len(parts[i]); j++ {
1447 mode := parts[i][j]
1448 modes[mode] = mt
1449 }
1450 }
1451 uc.availableChannelModes = modes
1452 return nil
1453}
1454
1455func (uc *upstreamConn) handleMemberships(s string) error {
1456 if s == "" {
1457 uc.availableMemberships = nil
1458 return nil
1459 }
1460
1461 if s[0] != '(' {
1462 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1463 }
1464 sep := strings.IndexByte(s, ')')
1465 if sep < 0 || len(s) != sep*2 {
1466 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1467 }
1468 memberships := make([]membership, len(s)/2-1)
1469 for i := range memberships {
1470 memberships[i] = membership{
1471 Mode: s[i+1],
1472 Prefix: s[sep+i+1],
1473 }
1474 }
1475 uc.availableMemberships = memberships
1476 return nil
1477}
1478
1479func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1480 caps := strings.Fields(capsStr)
1481 for _, s := range caps {
1482 kv := strings.SplitN(s, "=", 2)
1483 k := strings.ToLower(kv[0])
1484 var v string
1485 if len(kv) == 2 {
1486 v = kv[1]
1487 }
1488 uc.supportedCaps[k] = v
1489 }
1490}
1491
1492func (uc *upstreamConn) requestCaps() {
1493 var requestCaps []string
1494 for c := range permanentUpstreamCaps {
1495 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1496 requestCaps = append(requestCaps, c)
1497 }
1498 }
1499
1500 if uc.requestSASL() && !uc.caps["sasl"] {
1501 requestCaps = append(requestCaps, "sasl")
1502 }
1503
1504 if len(requestCaps) == 0 {
1505 return
1506 }
1507
1508 uc.SendMessage(&irc.Message{
1509 Command: "CAP",
1510 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1511 })
1512}
1513
1514func (uc *upstreamConn) requestSASL() bool {
1515 if uc.network.SASL.Mechanism == "" {
1516 return false
1517 }
1518
1519 v, ok := uc.supportedCaps["sasl"]
1520 if !ok {
1521 return false
1522 }
1523 if v != "" {
1524 mechanisms := strings.Split(v, ",")
1525 found := false
1526 for _, mech := range mechanisms {
1527 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1528 found = true
1529 break
1530 }
1531 }
1532 if !found {
1533 return false
1534 }
1535 }
1536
1537 return true
1538}
1539
1540func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1541 uc.caps[name] = ok
1542
1543 switch name {
1544 case "sasl":
1545 if !ok {
1546 uc.logger.Printf("server refused to acknowledge the SASL capability")
1547 return nil
1548 }
1549
1550 auth := &uc.network.SASL
1551 switch auth.Mechanism {
1552 case "PLAIN":
1553 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1554 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1555 case "EXTERNAL":
1556 uc.logger.Printf("starting SASL EXTERNAL authentication")
1557 uc.saslClient = sasl.NewExternalClient("")
1558 default:
1559 return fmt.Errorf("unsupported SASL mechanism %q", name)
1560 }
1561
1562 uc.SendMessage(&irc.Message{
1563 Command: "AUTHENTICATE",
1564 Params: []string{auth.Mechanism},
1565 })
1566 default:
1567 if permanentUpstreamCaps[name] {
1568 break
1569 }
1570 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1571 }
1572 return nil
1573}
1574
1575func splitSpace(s string) []string {
1576 return strings.FieldsFunc(s, func(r rune) bool {
1577 return r == ' '
1578 })
1579}
1580
1581func (uc *upstreamConn) register() {
1582 uc.nick = uc.network.Nick
1583 uc.username = uc.network.GetUsername()
1584 uc.realname = uc.network.GetRealname()
1585
1586 uc.SendMessage(&irc.Message{
1587 Command: "CAP",
1588 Params: []string{"LS", "302"},
1589 })
1590
1591 if uc.network.Pass != "" {
1592 uc.SendMessage(&irc.Message{
1593 Command: "PASS",
1594 Params: []string{uc.network.Pass},
1595 })
1596 }
1597
1598 uc.SendMessage(&irc.Message{
1599 Command: "NICK",
1600 Params: []string{uc.nick},
1601 })
1602 uc.SendMessage(&irc.Message{
1603 Command: "USER",
1604 Params: []string{uc.username, "0", "*", uc.realname},
1605 })
1606}
1607
1608func (uc *upstreamConn) runUntilRegistered() error {
1609 for !uc.registered {
1610 msg, err := uc.ReadMessage()
1611 if err != nil {
1612 return fmt.Errorf("failed to read message: %v", err)
1613 }
1614
1615 if err := uc.handleMessage(msg); err != nil {
1616 if _, ok := err.(registrationError); ok {
1617 return err
1618 } else {
1619 msg.Tags = nil // prevent message tags from cluttering logs
1620 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1621 }
1622 }
1623 }
1624
1625 for _, command := range uc.network.ConnectCommands {
1626 m, err := irc.ParseMessage(command)
1627 if err != nil {
1628 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1629 } else {
1630 uc.SendMessage(m)
1631 }
1632 }
1633
1634 return nil
1635}
1636
1637func (uc *upstreamConn) readMessages(ch chan<- event) error {
1638 for {
1639 msg, err := uc.ReadMessage()
1640 if err == io.EOF {
1641 break
1642 } else if err != nil {
1643 return fmt.Errorf("failed to read IRC command: %v", err)
1644 }
1645
1646 ch <- eventUpstreamMessage{msg, uc}
1647 }
1648
1649 return nil
1650}
1651
1652func (uc *upstreamConn) SendMessage(msg *irc.Message) {
1653 if !uc.caps["message-tags"] {
1654 msg = msg.Copy()
1655 msg.Tags = nil
1656 }
1657
1658 uc.conn.SendMessage(msg)
1659}
1660
1661func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1662 if uc.caps["labeled-response"] {
1663 if msg.Tags == nil {
1664 msg.Tags = make(map[string]irc.TagValue)
1665 }
1666 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1667 uc.nextLabelID++
1668 }
1669 uc.SendMessage(msg)
1670}
1671
1672// appendLog appends a message to the log file.
1673//
1674// The internal message ID is returned. If the message isn't recorded in the
1675// log file, an empty string is returned.
1676func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string) {
1677 if uc.user.msgStore == nil {
1678 return ""
1679 }
1680
1681 detached := false
1682 if ch, ok := uc.network.channels[entity]; ok {
1683 detached = ch.Detached
1684 }
1685
1686 delivered, ok := uc.network.delivered[entity]
1687 if !ok {
1688 lastID, err := uc.user.msgStore.LastMsgID(uc.network, entity, time.Now())
1689 if err != nil {
1690 uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
1691 return ""
1692 }
1693
1694 delivered = make(map[string]string)
1695 uc.network.delivered[entity] = delivered
1696
1697 for clientName, _ := range uc.network.offlineClients {
1698 delivered[clientName] = lastID
1699 }
1700
1701 if detached {
1702 // If the channel is detached, online clients act as offline
1703 // clients too
1704 uc.forEachDownstream(func(dc *downstreamConn) {
1705 delivered[dc.clientName] = lastID
1706 })
1707 }
1708 }
1709
1710 msgID, err := uc.user.msgStore.Append(uc.network, entity, msg)
1711 if err != nil {
1712 uc.logger.Printf("failed to log message: %v", err)
1713 return ""
1714 }
1715
1716 return msgID
1717}
1718
1719// produce appends a message to the logs and forwards it to connected downstream
1720// connections.
1721//
1722// If origin is not nil and origin doesn't support echo-message, the message is
1723// forwarded to all connections except origin.
1724func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1725 var msgID string
1726 if target != "" {
1727 msgID = uc.appendLog(target, msg)
1728 }
1729
1730 // Don't forward messages if it's a detached channel
1731 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1732 return
1733 }
1734
1735 uc.forEachDownstream(func(dc *downstreamConn) {
1736 if dc != origin || dc.caps["echo-message"] {
1737 dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
1738 } else {
1739 dc.advanceMessageWithID(msg, msgID)
1740 }
1741 })
1742}
1743
1744func (uc *upstreamConn) updateAway() {
1745 away := true
1746 uc.forEachDownstream(func(*downstreamConn) {
1747 away = false
1748 })
1749 if away == uc.away {
1750 return
1751 }
1752 if away {
1753 uc.SendMessage(&irc.Message{
1754 Command: "AWAY",
1755 Params: []string{"Auto away"},
1756 })
1757 } else {
1758 uc.SendMessage(&irc.Message{
1759 Command: "AWAY",
1760 })
1761 }
1762 uc.away = away
1763}
1764
1765func (uc *upstreamConn) updateChannelAutoDetach(name string) {
1766 if uch, ok := uc.channels[name]; ok {
1767 if ch, ok := uc.network.channels[name]; ok && !ch.Detached {
1768 uch.updateAutoDetach(ch.DetachAfter)
1769 }
1770 }
1771}
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