source: code/trunk/upstream.go@ 552

Last change on this file since 552 was 552, checked in by greg, 4 years ago

Forward MOTD messages downstream

The first MOTD upon connection is ignored, but subsequent MOTD messages
(requested by the "MOTD" message from the client, typically using a
/motd command) are forwarded.
File size: 46.3 KB
Line 
1package soju
2
3import (
4 "crypto"
5 "crypto/sha256"
6 "crypto/tls"
7 "crypto/x509"
8 "encoding/base64"
9 "errors"
10 "fmt"
11 "io"
12 "net"
13 "strconv"
14 "strings"
15 "time"
16
17 "github.com/emersion/go-sasl"
18 "gopkg.in/irc.v3"
19)
20
21// permanentUpstreamCaps is the static list of upstream capabilities always
22// requested when supported.
23var permanentUpstreamCaps = map[string]bool{
24 "away-notify": true,
25 "batch": true,
26 "extended-join": true,
27 "invite-notify": true,
28 "labeled-response": true,
29 "message-tags": true,
30 "multi-prefix": true,
31 "server-time": true,
32 "setname": true,
33}
34
35type registrationError string
36
37func (err registrationError) Error() string {
38 return fmt.Sprintf("registration error: %v", string(err))
39}
40
41type upstreamChannel struct {
42 Name string
43 conn *upstreamConn
44 Topic string
45 TopicWho *irc.Prefix
46 TopicTime time.Time
47 Status channelStatus
48 modes channelModes
49 creationTime string
50 Members membershipsCasemapMap
51 complete bool
52 detachTimer *time.Timer
53}
54
55func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
56 if uc.detachTimer != nil {
57 uc.detachTimer.Stop()
58 uc.detachTimer = nil
59 }
60
61 if dur == 0 {
62 return
63 }
64
65 uc.detachTimer = time.AfterFunc(dur, func() {
66 uc.conn.network.user.events <- eventChannelDetach{
67 uc: uc.conn,
68 name: uc.Name,
69 }
70 })
71}
72
73type upstreamConn struct {
74 conn
75
76 network *network
77 user *user
78
79 serverName string
80 availableUserModes string
81 availableChannelModes map[byte]channelModeType
82 availableChannelTypes string
83 availableMemberships []membership
84 isupport map[string]*string
85
86 registered bool
87 nick string
88 nickCM string
89 username string
90 realname string
91 modes userModes
92 channels upstreamChannelCasemapMap
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 casemapIsSet bool
103
104 // set of LIST commands in progress, per downstream
105 pendingLISTDownstreamSet map[uint64]struct{}
106
107 gotMotd bool
108}
109
110func connectToUpstream(network *network) (*upstreamConn, error) {
111 logger := &prefixLogger{network.user.logger, fmt.Sprintf("upstream %q: ", network.GetName())}
112
113 dialer := net.Dialer{Timeout: connectTimeout}
114
115 u, err := network.URL()
116 if err != nil {
117 return nil, err
118 }
119
120 var netConn net.Conn
121 switch u.Scheme {
122 case "ircs":
123 addr := u.Host
124 host, _, err := net.SplitHostPort(u.Host)
125 if err != nil {
126 host = u.Host
127 addr = u.Host + ":6697"
128 }
129
130 logger.Printf("connecting to TLS server at address %q", addr)
131
132 tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
133 if network.SASL.Mechanism == "EXTERNAL" {
134 if network.SASL.External.CertBlob == nil {
135 return nil, fmt.Errorf("missing certificate for authentication")
136 }
137 if network.SASL.External.PrivKeyBlob == nil {
138 return nil, fmt.Errorf("missing private key for authentication")
139 }
140 key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
141 if err != nil {
142 return nil, fmt.Errorf("failed to parse private key: %v", err)
143 }
144 tlsConfig.Certificates = []tls.Certificate{
145 {
146 Certificate: [][]byte{network.SASL.External.CertBlob},
147 PrivateKey: key.(crypto.PrivateKey),
148 },
149 }
150 logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
151 }
152
153 netConn, err = dialer.Dial("tcp", addr)
154 if err != nil {
155 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
156 }
157
158 // Don't do the TLS handshake immediately, because we need to register
159 // the new connection with identd ASAP. See:
160 // https://todo.sr.ht/~emersion/soju/69#event-41859
161 netConn = tls.Client(netConn, tlsConfig)
162 case "irc+insecure":
163 addr := u.Host
164 if _, _, err := net.SplitHostPort(addr); err != nil {
165 addr = addr + ":6667"
166 }
167
168 logger.Printf("connecting to plain-text server at address %q", addr)
169 netConn, err = dialer.Dial("tcp", addr)
170 if err != nil {
171 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
172 }
173 case "irc+unix", "unix":
174 logger.Printf("connecting to Unix socket at path %q", u.Path)
175 netConn, err = dialer.Dial("unix", u.Path)
176 if err != nil {
177 return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
178 }
179 default:
180 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
181 }
182
183 options := connOptions{
184 Logger: logger,
185 RateLimitDelay: upstreamMessageDelay,
186 RateLimitBurst: upstreamMessageBurst,
187 }
188
189 uc := &upstreamConn{
190 conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
191 network: network,
192 user: network.user,
193 channels: upstreamChannelCasemapMap{newCasemapMap(0)},
194 supportedCaps: make(map[string]string),
195 caps: make(map[string]bool),
196 batches: make(map[string]batch),
197 availableChannelTypes: stdChannelTypes,
198 availableChannelModes: stdChannelModes,
199 availableMemberships: stdMemberships,
200 isupport: make(map[string]*string),
201 pendingLISTDownstreamSet: make(map[uint64]struct{}),
202 }
203 return uc, nil
204}
205
206func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
207 uc.network.forEachDownstream(f)
208}
209
210func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
211 uc.forEachDownstream(func(dc *downstreamConn) {
212 if id != 0 && id != dc.id {
213 return
214 }
215 f(dc)
216 })
217}
218
219func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
220 ch := uc.channels.Value(name)
221 if ch == nil {
222 return nil, fmt.Errorf("unknown channel %q", name)
223 }
224 return ch, nil
225}
226
227func (uc *upstreamConn) isChannel(entity string) bool {
228 return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
229}
230
231func (uc *upstreamConn) isOurNick(nick string) bool {
232 return uc.nickCM == uc.network.casemap(nick)
233}
234
235func (uc *upstreamConn) getPendingLIST() *pendingLIST {
236 for _, pl := range uc.user.pendingLISTs {
237 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
238 continue
239 }
240 return &pl
241 }
242 return nil
243}
244
245func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
246 found = false
247 for i := 0; i < len(uc.user.pendingLISTs); i++ {
248 pl := uc.user.pendingLISTs[i]
249 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
250 continue
251 }
252 delete(pl.pendingCommands, uc.network.ID)
253 if len(pl.pendingCommands) == 0 {
254 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
255 i--
256 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
257 dc.SendMessage(&irc.Message{
258 Prefix: dc.srv.prefix(),
259 Command: irc.RPL_LISTEND,
260 Params: []string{dc.nick, "End of /LIST"},
261 })
262 })
263 }
264 found = true
265 if !all {
266 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
267 uc.user.forEachUpstream(func(uc *upstreamConn) {
268 uc.trySendLIST(pl.downstreamID)
269 })
270 return
271 }
272 }
273 return
274}
275
276func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
277 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
278 // a LIST command is already pending
279 // we will try again when that command is completed
280 return
281 }
282
283 for _, pl := range uc.user.pendingLISTs {
284 if pl.downstreamID != downstreamID {
285 continue
286 }
287 // this is the first pending LIST command list of the downstream
288 listCommand, ok := pl.pendingCommands[uc.network.ID]
289 if !ok {
290 // there is no command for this upstream in these LIST commands
291 // do not send anything
292 continue
293 }
294 // there is a command for this upstream in these LIST commands
295 // send it now
296
297 uc.SendMessageLabeled(downstreamID, listCommand)
298
299 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
300 return
301 }
302}
303
304func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
305 memberships := make(memberships, 0, 4)
306 i := 0
307 for _, m := range uc.availableMemberships {
308 if i >= len(s) {
309 break
310 }
311 if s[i] == m.Prefix {
312 memberships = append(memberships, m)
313 i++
314 }
315 }
316 return &memberships, s[i:]
317}
318
319func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
320 var label string
321 if l, ok := msg.GetTag("label"); ok {
322 label = l
323 delete(msg.Tags, "label")
324 }
325
326 var msgBatch *batch
327 if batchName, ok := msg.GetTag("batch"); ok {
328 b, ok := uc.batches[batchName]
329 if !ok {
330 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
331 }
332 msgBatch = &b
333 if label == "" {
334 label = msgBatch.Label
335 }
336 delete(msg.Tags, "batch")
337 }
338
339 var downstreamID uint64 = 0
340 if label != "" {
341 var labelOffset uint64
342 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
343 if err == nil && n < 2 {
344 err = errors.New("not enough arguments")
345 }
346 if err != nil {
347 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
348 }
349 }
350
351 if _, ok := msg.Tags["time"]; !ok {
352 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
353 }
354
355 switch msg.Command {
356 case "PING":
357 uc.SendMessage(&irc.Message{
358 Command: "PONG",
359 Params: msg.Params,
360 })
361 return nil
362 case "NOTICE", "PRIVMSG", "TAGMSG":
363 if msg.Prefix == nil {
364 return fmt.Errorf("expected a prefix")
365 }
366
367 var entity, text string
368 if msg.Command != "TAGMSG" {
369 if err := parseMessageParams(msg, &entity, &text); err != nil {
370 return err
371 }
372 } else {
373 if err := parseMessageParams(msg, &entity); err != nil {
374 return err
375 }
376 }
377
378 if msg.Prefix.Name == serviceNick {
379 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
380 break
381 }
382 if entity == serviceNick {
383 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
384 break
385 }
386
387 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
388 uc.produce("", msg, nil)
389 } else { // regular user message
390 target := entity
391 if uc.isOurNick(target) {
392 target = msg.Prefix.Name
393 }
394
395 ch := uc.network.channels.Value(target)
396 if ch != nil && msg.Command != "TAGMSG" {
397 if ch.Detached {
398 uc.handleDetachedMessage(ch, msg)
399 }
400
401 highlight := uc.network.isHighlight(msg)
402 if ch.DetachOn == FilterMessage || ch.DetachOn == FilterDefault || (ch.DetachOn == FilterHighlight && highlight) {
403 uc.updateChannelAutoDetach(target)
404 }
405 }
406
407 uc.produce(target, msg, nil)
408 }
409 case "CAP":
410 var subCmd string
411 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
412 return err
413 }
414 subCmd = strings.ToUpper(subCmd)
415 subParams := msg.Params[2:]
416 switch subCmd {
417 case "LS":
418 if len(subParams) < 1 {
419 return newNeedMoreParamsError(msg.Command)
420 }
421 caps := subParams[len(subParams)-1]
422 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
423
424 uc.handleSupportedCaps(caps)
425
426 if more {
427 break // wait to receive all capabilities
428 }
429
430 uc.requestCaps()
431
432 if uc.requestSASL() {
433 break // we'll send CAP END after authentication is completed
434 }
435
436 uc.SendMessage(&irc.Message{
437 Command: "CAP",
438 Params: []string{"END"},
439 })
440 case "ACK", "NAK":
441 if len(subParams) < 1 {
442 return newNeedMoreParamsError(msg.Command)
443 }
444 caps := strings.Fields(subParams[0])
445
446 for _, name := range caps {
447 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
448 return err
449 }
450 }
451
452 if uc.registered {
453 uc.forEachDownstream(func(dc *downstreamConn) {
454 dc.updateSupportedCaps()
455 })
456 }
457 case "NEW":
458 if len(subParams) < 1 {
459 return newNeedMoreParamsError(msg.Command)
460 }
461 uc.handleSupportedCaps(subParams[0])
462 uc.requestCaps()
463 case "DEL":
464 if len(subParams) < 1 {
465 return newNeedMoreParamsError(msg.Command)
466 }
467 caps := strings.Fields(subParams[0])
468
469 for _, c := range caps {
470 delete(uc.supportedCaps, c)
471 delete(uc.caps, c)
472 }
473
474 if uc.registered {
475 uc.forEachDownstream(func(dc *downstreamConn) {
476 dc.updateSupportedCaps()
477 })
478 }
479 default:
480 uc.logger.Printf("unhandled message: %v", msg)
481 }
482 case "AUTHENTICATE":
483 if uc.saslClient == nil {
484 return fmt.Errorf("received unexpected AUTHENTICATE message")
485 }
486
487 // TODO: if a challenge is 400 bytes long, buffer it
488 var challengeStr string
489 if err := parseMessageParams(msg, &challengeStr); err != nil {
490 uc.SendMessage(&irc.Message{
491 Command: "AUTHENTICATE",
492 Params: []string{"*"},
493 })
494 return err
495 }
496
497 var challenge []byte
498 if challengeStr != "+" {
499 var err error
500 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
501 if err != nil {
502 uc.SendMessage(&irc.Message{
503 Command: "AUTHENTICATE",
504 Params: []string{"*"},
505 })
506 return err
507 }
508 }
509
510 var resp []byte
511 var err error
512 if !uc.saslStarted {
513 _, resp, err = uc.saslClient.Start()
514 uc.saslStarted = true
515 } else {
516 resp, err = uc.saslClient.Next(challenge)
517 }
518 if err != nil {
519 uc.SendMessage(&irc.Message{
520 Command: "AUTHENTICATE",
521 Params: []string{"*"},
522 })
523 return err
524 }
525
526 // TODO: send response in multiple chunks if >= 400 bytes
527 var respStr = "+"
528 if len(resp) != 0 {
529 respStr = base64.StdEncoding.EncodeToString(resp)
530 }
531
532 uc.SendMessage(&irc.Message{
533 Command: "AUTHENTICATE",
534 Params: []string{respStr},
535 })
536 case irc.RPL_LOGGEDIN:
537 var account string
538 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
539 return err
540 }
541 uc.logger.Printf("logged in with account %q", account)
542 case irc.RPL_LOGGEDOUT:
543 uc.logger.Printf("logged out")
544 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
545 var info string
546 if err := parseMessageParams(msg, nil, &info); err != nil {
547 return err
548 }
549 switch msg.Command {
550 case irc.ERR_NICKLOCKED:
551 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
552 case irc.ERR_SASLFAIL:
553 uc.logger.Printf("SASL authentication failed: %v", info)
554 case irc.ERR_SASLTOOLONG:
555 uc.logger.Printf("SASL message too long: %v", info)
556 }
557
558 uc.saslClient = nil
559 uc.saslStarted = false
560
561 uc.SendMessage(&irc.Message{
562 Command: "CAP",
563 Params: []string{"END"},
564 })
565 case irc.RPL_WELCOME:
566 uc.registered = true
567 uc.logger.Printf("connection registered")
568
569 if uc.network.channels.Len() > 0 {
570 var channels, keys []string
571 for _, entry := range uc.network.channels.innerMap {
572 ch := entry.value.(*Channel)
573 channels = append(channels, ch.Name)
574 keys = append(keys, ch.Key)
575 }
576
577 for _, msg := range join(channels, keys) {
578 uc.SendMessage(msg)
579 }
580 }
581 case irc.RPL_MYINFO:
582 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
583 return err
584 }
585 case irc.RPL_ISUPPORT:
586 if err := parseMessageParams(msg, nil, nil); err != nil {
587 return err
588 }
589
590 var downstreamIsupport []string
591 for _, token := range msg.Params[1 : len(msg.Params)-1] {
592 parameter := token
593 var negate, hasValue bool
594 var value string
595 if strings.HasPrefix(token, "-") {
596 negate = true
597 token = token[1:]
598 } else if i := strings.IndexByte(token, '='); i >= 0 {
599 parameter = token[:i]
600 value = token[i+1:]
601 hasValue = true
602 }
603
604 if hasValue {
605 uc.isupport[parameter] = &value
606 } else if !negate {
607 uc.isupport[parameter] = nil
608 } else {
609 delete(uc.isupport, parameter)
610 }
611
612 var err error
613 switch parameter {
614 case "CASEMAPPING":
615 casemap, ok := parseCasemappingToken(value)
616 if !ok {
617 casemap = casemapRFC1459
618 }
619 uc.network.updateCasemapping(casemap)
620 uc.nickCM = uc.network.casemap(uc.nick)
621 uc.casemapIsSet = true
622 case "CHANMODES":
623 if !negate {
624 err = uc.handleChanModes(value)
625 } else {
626 uc.availableChannelModes = stdChannelModes
627 }
628 case "CHANTYPES":
629 if !negate {
630 uc.availableChannelTypes = value
631 } else {
632 uc.availableChannelTypes = stdChannelTypes
633 }
634 case "PREFIX":
635 if !negate {
636 err = uc.handleMemberships(value)
637 } else {
638 uc.availableMemberships = stdMemberships
639 }
640 }
641 if err != nil {
642 return err
643 }
644
645 if passthroughIsupport[parameter] {
646 downstreamIsupport = append(downstreamIsupport, token)
647 }
648 }
649
650 uc.forEachDownstream(func(dc *downstreamConn) {
651 if dc.network == nil {
652 return
653 }
654 msgs := generateIsupport(dc.srv.prefix(), dc.nick, downstreamIsupport)
655 for _, msg := range msgs {
656 dc.SendMessage(msg)
657 }
658 })
659 case irc.ERR_NOMOTD, irc.RPL_ENDOFMOTD:
660 if !uc.casemapIsSet {
661 // upstream did not send any CASEMAPPING token, thus
662 // we assume it implements the old RFCs with rfc1459.
663 uc.casemapIsSet = true
664 uc.network.updateCasemapping(casemapRFC1459)
665 uc.nickCM = uc.network.casemap(uc.nick)
666 }
667
668 if !uc.gotMotd {
669 // Ignore the initial MOTD upon connection, but forward
670 // subsequent MOTD messages downstream
671 uc.gotMotd = true
672 return nil
673 }
674
675 uc.forEachDownstreamByID(downstreamID, func (dc *downstreamConn) {
676 dc.SendMessage(&irc.Message {
677 Prefix: uc.srv.prefix(),
678 Command: msg.Command,
679 Params: msg.Params,
680 })
681 })
682 case "BATCH":
683 var tag string
684 if err := parseMessageParams(msg, &tag); err != nil {
685 return err
686 }
687
688 if strings.HasPrefix(tag, "+") {
689 tag = tag[1:]
690 if _, ok := uc.batches[tag]; ok {
691 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
692 }
693 var batchType string
694 if err := parseMessageParams(msg, nil, &batchType); err != nil {
695 return err
696 }
697 label := label
698 if label == "" && msgBatch != nil {
699 label = msgBatch.Label
700 }
701 uc.batches[tag] = batch{
702 Type: batchType,
703 Params: msg.Params[2:],
704 Outer: msgBatch,
705 Label: label,
706 }
707 } else if strings.HasPrefix(tag, "-") {
708 tag = tag[1:]
709 if _, ok := uc.batches[tag]; !ok {
710 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
711 }
712 delete(uc.batches, tag)
713 } else {
714 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
715 }
716 case "NICK":
717 if msg.Prefix == nil {
718 return fmt.Errorf("expected a prefix")
719 }
720
721 var newNick string
722 if err := parseMessageParams(msg, &newNick); err != nil {
723 return err
724 }
725
726 me := false
727 if uc.isOurNick(msg.Prefix.Name) {
728 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
729 me = true
730 uc.nick = newNick
731 uc.nickCM = uc.network.casemap(uc.nick)
732 }
733
734 for _, entry := range uc.channels.innerMap {
735 ch := entry.value.(*upstreamChannel)
736 memberships := ch.Members.Value(msg.Prefix.Name)
737 if memberships != nil {
738 ch.Members.Delete(msg.Prefix.Name)
739 ch.Members.SetValue(newNick, memberships)
740 uc.appendLog(ch.Name, msg)
741 }
742 }
743
744 if !me {
745 uc.forEachDownstream(func(dc *downstreamConn) {
746 dc.SendMessage(dc.marshalMessage(msg, uc.network))
747 })
748 } else {
749 uc.forEachDownstream(func(dc *downstreamConn) {
750 dc.updateNick()
751 })
752 }
753 case "SETNAME":
754 if msg.Prefix == nil {
755 return fmt.Errorf("expected a prefix")
756 }
757
758 var newRealname string
759 if err := parseMessageParams(msg, &newRealname); err != nil {
760 return err
761 }
762
763 // TODO: consider appending this message to logs
764
765 if uc.isOurNick(msg.Prefix.Name) {
766 uc.logger.Printf("changed realname from %q to %q", uc.realname, newRealname)
767 uc.realname = newRealname
768
769 uc.forEachDownstream(func(dc *downstreamConn) {
770 dc.updateRealname()
771 })
772 } else {
773 uc.forEachDownstream(func(dc *downstreamConn) {
774 dc.SendMessage(dc.marshalMessage(msg, uc.network))
775 })
776 }
777 case "JOIN":
778 if msg.Prefix == nil {
779 return fmt.Errorf("expected a prefix")
780 }
781
782 var channels string
783 if err := parseMessageParams(msg, &channels); err != nil {
784 return err
785 }
786
787 for _, ch := range strings.Split(channels, ",") {
788 if uc.isOurNick(msg.Prefix.Name) {
789 uc.logger.Printf("joined channel %q", ch)
790 members := membershipsCasemapMap{newCasemapMap(0)}
791 members.casemap = uc.network.casemap
792 uc.channels.SetValue(ch, &upstreamChannel{
793 Name: ch,
794 conn: uc,
795 Members: members,
796 })
797 uc.updateChannelAutoDetach(ch)
798
799 uc.SendMessage(&irc.Message{
800 Command: "MODE",
801 Params: []string{ch},
802 })
803 } else {
804 ch, err := uc.getChannel(ch)
805 if err != nil {
806 return err
807 }
808 ch.Members.SetValue(msg.Prefix.Name, &memberships{})
809 }
810
811 chMsg := msg.Copy()
812 chMsg.Params[0] = ch
813 uc.produce(ch, chMsg, nil)
814 }
815 case "PART":
816 if msg.Prefix == nil {
817 return fmt.Errorf("expected a prefix")
818 }
819
820 var channels string
821 if err := parseMessageParams(msg, &channels); err != nil {
822 return err
823 }
824
825 for _, ch := range strings.Split(channels, ",") {
826 if uc.isOurNick(msg.Prefix.Name) {
827 uc.logger.Printf("parted channel %q", ch)
828 uch := uc.channels.Value(ch)
829 if uch != nil {
830 uc.channels.Delete(ch)
831 uch.updateAutoDetach(0)
832 }
833 } else {
834 ch, err := uc.getChannel(ch)
835 if err != nil {
836 return err
837 }
838 ch.Members.Delete(msg.Prefix.Name)
839 }
840
841 chMsg := msg.Copy()
842 chMsg.Params[0] = ch
843 uc.produce(ch, chMsg, nil)
844 }
845 case "KICK":
846 if msg.Prefix == nil {
847 return fmt.Errorf("expected a prefix")
848 }
849
850 var channel, user string
851 if err := parseMessageParams(msg, &channel, &user); err != nil {
852 return err
853 }
854
855 if uc.isOurNick(user) {
856 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
857 uc.channels.Delete(channel)
858 } else {
859 ch, err := uc.getChannel(channel)
860 if err != nil {
861 return err
862 }
863 ch.Members.Delete(user)
864 }
865
866 uc.produce(channel, msg, nil)
867 case "QUIT":
868 if msg.Prefix == nil {
869 return fmt.Errorf("expected a prefix")
870 }
871
872 if uc.isOurNick(msg.Prefix.Name) {
873 uc.logger.Printf("quit")
874 }
875
876 for _, entry := range uc.channels.innerMap {
877 ch := entry.value.(*upstreamChannel)
878 if ch.Members.Has(msg.Prefix.Name) {
879 ch.Members.Delete(msg.Prefix.Name)
880
881 uc.appendLog(ch.Name, msg)
882 }
883 }
884
885 if msg.Prefix.Name != uc.nick {
886 uc.forEachDownstream(func(dc *downstreamConn) {
887 dc.SendMessage(dc.marshalMessage(msg, uc.network))
888 })
889 }
890 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
891 var name, topic string
892 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
893 return err
894 }
895 ch, err := uc.getChannel(name)
896 if err != nil {
897 return err
898 }
899 if msg.Command == irc.RPL_TOPIC {
900 ch.Topic = topic
901 } else {
902 ch.Topic = ""
903 }
904 case "TOPIC":
905 if msg.Prefix == nil {
906 return fmt.Errorf("expected a prefix")
907 }
908
909 var name string
910 if err := parseMessageParams(msg, &name); err != nil {
911 return err
912 }
913 ch, err := uc.getChannel(name)
914 if err != nil {
915 return err
916 }
917 if len(msg.Params) > 1 {
918 ch.Topic = msg.Params[1]
919 ch.TopicWho = msg.Prefix.Copy()
920 ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
921 } else {
922 ch.Topic = ""
923 }
924 uc.produce(ch.Name, msg, nil)
925 case "MODE":
926 var name, modeStr string
927 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
928 return err
929 }
930
931 if !uc.isChannel(name) { // user mode change
932 if name != uc.nick {
933 return fmt.Errorf("received MODE message for unknown nick %q", name)
934 }
935 return uc.modes.Apply(modeStr)
936 // TODO: notify downstreams about user mode change?
937 } else { // channel mode change
938 ch, err := uc.getChannel(name)
939 if err != nil {
940 return err
941 }
942
943 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
944 if err != nil {
945 return err
946 }
947
948 uc.appendLog(ch.Name, msg)
949
950 c := uc.network.channels.Value(name)
951 if c == nil || !c.Detached {
952 uc.forEachDownstream(func(dc *downstreamConn) {
953 params := make([]string, len(msg.Params))
954 params[0] = dc.marshalEntity(uc.network, name)
955 params[1] = modeStr
956
957 copy(params[2:], msg.Params[2:])
958 for i, modeParam := range params[2:] {
959 if _, ok := needMarshaling[i]; ok {
960 params[2+i] = dc.marshalEntity(uc.network, modeParam)
961 }
962 }
963
964 dc.SendMessage(&irc.Message{
965 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
966 Command: "MODE",
967 Params: params,
968 })
969 })
970 }
971 }
972 case irc.RPL_UMODEIS:
973 if err := parseMessageParams(msg, nil); err != nil {
974 return err
975 }
976 modeStr := ""
977 if len(msg.Params) > 1 {
978 modeStr = msg.Params[1]
979 }
980
981 uc.modes = ""
982 if err := uc.modes.Apply(modeStr); err != nil {
983 return err
984 }
985 // TODO: send RPL_UMODEIS to downstream connections when applicable
986 case irc.RPL_CHANNELMODEIS:
987 var channel string
988 if err := parseMessageParams(msg, nil, &channel); err != nil {
989 return err
990 }
991 modeStr := ""
992 if len(msg.Params) > 2 {
993 modeStr = msg.Params[2]
994 }
995
996 ch, err := uc.getChannel(channel)
997 if err != nil {
998 return err
999 }
1000
1001 firstMode := ch.modes == nil
1002 ch.modes = make(map[byte]string)
1003 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
1004 return err
1005 }
1006 if firstMode {
1007 c := uc.network.channels.Value(channel)
1008 if c == nil || !c.Detached {
1009 modeStr, modeParams := ch.modes.Format()
1010
1011 uc.forEachDownstream(func(dc *downstreamConn) {
1012 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
1013 params = append(params, modeParams...)
1014
1015 dc.SendMessage(&irc.Message{
1016 Prefix: dc.srv.prefix(),
1017 Command: irc.RPL_CHANNELMODEIS,
1018 Params: params,
1019 })
1020 })
1021 }
1022 }
1023 case rpl_creationtime:
1024 var channel, creationTime string
1025 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
1026 return err
1027 }
1028
1029 ch, err := uc.getChannel(channel)
1030 if err != nil {
1031 return err
1032 }
1033
1034 firstCreationTime := ch.creationTime == ""
1035 ch.creationTime = creationTime
1036 if firstCreationTime {
1037 uc.forEachDownstream(func(dc *downstreamConn) {
1038 dc.SendMessage(&irc.Message{
1039 Prefix: dc.srv.prefix(),
1040 Command: rpl_creationtime,
1041 Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
1042 })
1043 })
1044 }
1045 case rpl_topicwhotime:
1046 var name, who, timeStr string
1047 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
1048 return err
1049 }
1050 ch, err := uc.getChannel(name)
1051 if err != nil {
1052 return err
1053 }
1054 firstTopicWhoTime := ch.TopicWho == nil
1055 ch.TopicWho = irc.ParsePrefix(who)
1056 sec, err := strconv.ParseInt(timeStr, 10, 64)
1057 if err != nil {
1058 return fmt.Errorf("failed to parse topic time: %v", err)
1059 }
1060 ch.TopicTime = time.Unix(sec, 0)
1061 if firstTopicWhoTime {
1062 uc.forEachDownstream(func(dc *downstreamConn) {
1063 topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
1064 dc.SendMessage(&irc.Message{
1065 Prefix: dc.srv.prefix(),
1066 Command: rpl_topicwhotime,
1067 Params: []string{
1068 dc.nick,
1069 dc.marshalEntity(uc.network, ch.Name),
1070 topicWho.String(),
1071 timeStr,
1072 },
1073 })
1074 })
1075 }
1076 case irc.RPL_LIST:
1077 var channel, clients, topic string
1078 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
1079 return err
1080 }
1081
1082 pl := uc.getPendingLIST()
1083 if pl == nil {
1084 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
1085 }
1086
1087 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
1088 dc.SendMessage(&irc.Message{
1089 Prefix: dc.srv.prefix(),
1090 Command: irc.RPL_LIST,
1091 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
1092 })
1093 })
1094 case irc.RPL_LISTEND:
1095 ok := uc.endPendingLISTs(false)
1096 if !ok {
1097 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
1098 }
1099 case irc.RPL_NAMREPLY:
1100 var name, statusStr, members string
1101 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
1102 return err
1103 }
1104
1105 ch := uc.channels.Value(name)
1106 if ch == nil {
1107 // NAMES on a channel we have not joined, forward to downstream
1108 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1109 channel := dc.marshalEntity(uc.network, name)
1110 members := splitSpace(members)
1111 for i, member := range members {
1112 memberships, nick := uc.parseMembershipPrefix(member)
1113 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1114 }
1115 memberStr := strings.Join(members, " ")
1116
1117 dc.SendMessage(&irc.Message{
1118 Prefix: dc.srv.prefix(),
1119 Command: irc.RPL_NAMREPLY,
1120 Params: []string{dc.nick, statusStr, channel, memberStr},
1121 })
1122 })
1123 return nil
1124 }
1125
1126 status, err := parseChannelStatus(statusStr)
1127 if err != nil {
1128 return err
1129 }
1130 ch.Status = status
1131
1132 for _, s := range splitSpace(members) {
1133 memberships, nick := uc.parseMembershipPrefix(s)
1134 ch.Members.SetValue(nick, memberships)
1135 }
1136 case irc.RPL_ENDOFNAMES:
1137 var name string
1138 if err := parseMessageParams(msg, nil, &name); err != nil {
1139 return err
1140 }
1141
1142 ch := uc.channels.Value(name)
1143 if ch == nil {
1144 // NAMES on a channel we have not joined, forward to downstream
1145 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1146 channel := dc.marshalEntity(uc.network, name)
1147
1148 dc.SendMessage(&irc.Message{
1149 Prefix: dc.srv.prefix(),
1150 Command: irc.RPL_ENDOFNAMES,
1151 Params: []string{dc.nick, channel, "End of /NAMES list"},
1152 })
1153 })
1154 return nil
1155 }
1156
1157 if ch.complete {
1158 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1159 }
1160 ch.complete = true
1161
1162 c := uc.network.channels.Value(name)
1163 if c == nil || !c.Detached {
1164 uc.forEachDownstream(func(dc *downstreamConn) {
1165 forwardChannel(dc, ch)
1166 })
1167 }
1168 case irc.RPL_WHOREPLY:
1169 var channel, username, host, server, nick, mode, trailing string
1170 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1171 return err
1172 }
1173
1174 parts := strings.SplitN(trailing, " ", 2)
1175 if len(parts) != 2 {
1176 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1177 }
1178 realname := parts[1]
1179 hops, err := strconv.Atoi(parts[0])
1180 if err != nil {
1181 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1182 }
1183 hops++
1184
1185 trailing = strconv.Itoa(hops) + " " + realname
1186
1187 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1188 channel := channel
1189 if channel != "*" {
1190 channel = dc.marshalEntity(uc.network, channel)
1191 }
1192 nick := dc.marshalEntity(uc.network, nick)
1193 dc.SendMessage(&irc.Message{
1194 Prefix: dc.srv.prefix(),
1195 Command: irc.RPL_WHOREPLY,
1196 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1197 })
1198 })
1199 case irc.RPL_ENDOFWHO:
1200 var name string
1201 if err := parseMessageParams(msg, nil, &name); err != nil {
1202 return err
1203 }
1204
1205 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1206 name := name
1207 if name != "*" {
1208 // TODO: support WHO masks
1209 name = dc.marshalEntity(uc.network, name)
1210 }
1211 dc.SendMessage(&irc.Message{
1212 Prefix: dc.srv.prefix(),
1213 Command: irc.RPL_ENDOFWHO,
1214 Params: []string{dc.nick, name, "End of /WHO list"},
1215 })
1216 })
1217 case irc.RPL_WHOISUSER:
1218 var nick, username, host, realname string
1219 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1220 return err
1221 }
1222
1223 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1224 nick := dc.marshalEntity(uc.network, nick)
1225 dc.SendMessage(&irc.Message{
1226 Prefix: dc.srv.prefix(),
1227 Command: irc.RPL_WHOISUSER,
1228 Params: []string{dc.nick, nick, username, host, "*", realname},
1229 })
1230 })
1231 case irc.RPL_WHOISSERVER:
1232 var nick, server, serverInfo string
1233 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1234 return err
1235 }
1236
1237 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1238 nick := dc.marshalEntity(uc.network, nick)
1239 dc.SendMessage(&irc.Message{
1240 Prefix: dc.srv.prefix(),
1241 Command: irc.RPL_WHOISSERVER,
1242 Params: []string{dc.nick, nick, server, serverInfo},
1243 })
1244 })
1245 case irc.RPL_WHOISOPERATOR:
1246 var nick string
1247 if err := parseMessageParams(msg, nil, &nick); err != nil {
1248 return err
1249 }
1250
1251 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1252 nick := dc.marshalEntity(uc.network, nick)
1253 dc.SendMessage(&irc.Message{
1254 Prefix: dc.srv.prefix(),
1255 Command: irc.RPL_WHOISOPERATOR,
1256 Params: []string{dc.nick, nick, "is an IRC operator"},
1257 })
1258 })
1259 case irc.RPL_WHOISIDLE:
1260 var nick string
1261 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1262 return err
1263 }
1264
1265 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1266 nick := dc.marshalEntity(uc.network, nick)
1267 params := []string{dc.nick, nick}
1268 params = append(params, msg.Params[2:]...)
1269 dc.SendMessage(&irc.Message{
1270 Prefix: dc.srv.prefix(),
1271 Command: irc.RPL_WHOISIDLE,
1272 Params: params,
1273 })
1274 })
1275 case irc.RPL_WHOISCHANNELS:
1276 var nick, channelList string
1277 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1278 return err
1279 }
1280 channels := splitSpace(channelList)
1281
1282 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1283 nick := dc.marshalEntity(uc.network, nick)
1284 channelList := make([]string, len(channels))
1285 for i, channel := range channels {
1286 prefix, channel := uc.parseMembershipPrefix(channel)
1287 channel = dc.marshalEntity(uc.network, channel)
1288 channelList[i] = prefix.Format(dc) + channel
1289 }
1290 channels := strings.Join(channelList, " ")
1291 dc.SendMessage(&irc.Message{
1292 Prefix: dc.srv.prefix(),
1293 Command: irc.RPL_WHOISCHANNELS,
1294 Params: []string{dc.nick, nick, channels},
1295 })
1296 })
1297 case irc.RPL_ENDOFWHOIS:
1298 var nick string
1299 if err := parseMessageParams(msg, nil, &nick); err != nil {
1300 return err
1301 }
1302
1303 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1304 nick := dc.marshalEntity(uc.network, nick)
1305 dc.SendMessage(&irc.Message{
1306 Prefix: dc.srv.prefix(),
1307 Command: irc.RPL_ENDOFWHOIS,
1308 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1309 })
1310 })
1311 case "INVITE":
1312 var nick, channel string
1313 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1314 return err
1315 }
1316
1317 weAreInvited := uc.isOurNick(nick)
1318
1319 uc.forEachDownstream(func(dc *downstreamConn) {
1320 if !weAreInvited && !dc.caps["invite-notify"] {
1321 return
1322 }
1323 dc.SendMessage(&irc.Message{
1324 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1325 Command: "INVITE",
1326 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1327 })
1328 })
1329 case irc.RPL_INVITING:
1330 var nick, channel string
1331 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1332 return err
1333 }
1334
1335 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1336 dc.SendMessage(&irc.Message{
1337 Prefix: dc.srv.prefix(),
1338 Command: irc.RPL_INVITING,
1339 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1340 })
1341 })
1342 case irc.RPL_AWAY:
1343 var nick, reason string
1344 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1345 return err
1346 }
1347
1348 uc.forEachDownstream(func(dc *downstreamConn) {
1349 dc.SendMessage(&irc.Message{
1350 Prefix: dc.srv.prefix(),
1351 Command: irc.RPL_AWAY,
1352 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1353 })
1354 })
1355 case "AWAY":
1356 if msg.Prefix == nil {
1357 return fmt.Errorf("expected a prefix")
1358 }
1359
1360 uc.forEachDownstream(func(dc *downstreamConn) {
1361 if !dc.caps["away-notify"] {
1362 return
1363 }
1364 dc.SendMessage(&irc.Message{
1365 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1366 Command: "AWAY",
1367 Params: msg.Params,
1368 })
1369 })
1370 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1371 var channel, mask string
1372 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1373 return err
1374 }
1375 var addNick, addTime string
1376 if len(msg.Params) >= 5 {
1377 addNick = msg.Params[3]
1378 addTime = msg.Params[4]
1379 }
1380
1381 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1382 channel := dc.marshalEntity(uc.network, channel)
1383
1384 var params []string
1385 if addNick != "" && addTime != "" {
1386 addNick := dc.marshalEntity(uc.network, addNick)
1387 params = []string{dc.nick, channel, mask, addNick, addTime}
1388 } else {
1389 params = []string{dc.nick, channel, mask}
1390 }
1391
1392 dc.SendMessage(&irc.Message{
1393 Prefix: dc.srv.prefix(),
1394 Command: msg.Command,
1395 Params: params,
1396 })
1397 })
1398 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1399 var channel, trailing string
1400 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1401 return err
1402 }
1403
1404 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1405 upstreamChannel := dc.marshalEntity(uc.network, channel)
1406 dc.SendMessage(&irc.Message{
1407 Prefix: dc.srv.prefix(),
1408 Command: msg.Command,
1409 Params: []string{dc.nick, upstreamChannel, trailing},
1410 })
1411 })
1412 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1413 var command, reason string
1414 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1415 return err
1416 }
1417
1418 if command == "LIST" {
1419 ok := uc.endPendingLISTs(false)
1420 if !ok {
1421 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1422 }
1423 }
1424
1425 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1426 dc.SendMessage(&irc.Message{
1427 Prefix: uc.srv.prefix(),
1428 Command: msg.Command,
1429 Params: []string{dc.nick, command, reason},
1430 })
1431 })
1432 case "ACK":
1433 // Ignore
1434 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1435 // Ignore
1436 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1437 // Ignore
1438 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1439 // Ignore
1440 case irc.RPL_MOTDSTART, irc.RPL_MOTD:
1441 if !uc.gotMotd {
1442 return nil
1443 }
1444
1445 uc.forEachDownstreamByID(downstreamID, func (dc *downstreamConn) {
1446 dc.SendMessage(&irc.Message {
1447 Prefix: uc.srv.prefix(),
1448 Command: msg.Command,
1449 Params: msg.Params,
1450 })
1451 })
1452 case irc.RPL_LISTSTART:
1453 // Ignore
1454 case rpl_localusers, rpl_globalusers:
1455 // Ignore
1456 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1457 // Ignore
1458 case "ERROR":
1459 var text string
1460 if err := parseMessageParams(msg, &text); err != nil {
1461 return err
1462 }
1463 return fmt.Errorf("fatal server error: %v", text)
1464 case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
1465 if !uc.registered {
1466 text := msg.Params[len(msg.Params)-1]
1467 return registrationError(text)
1468 }
1469 fallthrough
1470 default:
1471 uc.logger.Printf("unhandled message: %v", msg)
1472
1473 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1474 // best effort marshaling for unknown messages, replies and errors:
1475 // most numerics start with the user nick, marshal it if that's the case
1476 // otherwise, conservately keep the params without marshaling
1477 params := msg.Params
1478 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1479 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1480 params[0] = dc.nick
1481 }
1482 }
1483 dc.SendMessage(&irc.Message{
1484 Prefix: uc.srv.prefix(),
1485 Command: msg.Command,
1486 Params: params,
1487 })
1488 })
1489 }
1490 return nil
1491}
1492
1493func (uc *upstreamConn) handleDetachedMessage(ch *Channel, msg *irc.Message) {
1494 if uc.network.detachedMessageNeedsRelay(ch, msg) {
1495 uc.forEachDownstream(func(dc *downstreamConn) {
1496 dc.relayDetachedMessage(uc.network, msg)
1497 })
1498 }
1499 if ch.ReattachOn == FilterMessage || (ch.ReattachOn == FilterHighlight && uc.network.isHighlight(msg)) {
1500 uc.network.attach(ch)
1501 if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1502 uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
1503 }
1504 }
1505}
1506
1507func (uc *upstreamConn) handleChanModes(s string) error {
1508 parts := strings.SplitN(s, ",", 5)
1509 if len(parts) < 4 {
1510 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
1511 }
1512 modes := make(map[byte]channelModeType)
1513 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
1514 for j := 0; j < len(parts[i]); j++ {
1515 mode := parts[i][j]
1516 modes[mode] = mt
1517 }
1518 }
1519 uc.availableChannelModes = modes
1520 return nil
1521}
1522
1523func (uc *upstreamConn) handleMemberships(s string) error {
1524 if s == "" {
1525 uc.availableMemberships = nil
1526 return nil
1527 }
1528
1529 if s[0] != '(' {
1530 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1531 }
1532 sep := strings.IndexByte(s, ')')
1533 if sep < 0 || len(s) != sep*2 {
1534 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
1535 }
1536 memberships := make([]membership, len(s)/2-1)
1537 for i := range memberships {
1538 memberships[i] = membership{
1539 Mode: s[i+1],
1540 Prefix: s[sep+i+1],
1541 }
1542 }
1543 uc.availableMemberships = memberships
1544 return nil
1545}
1546
1547func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1548 caps := strings.Fields(capsStr)
1549 for _, s := range caps {
1550 kv := strings.SplitN(s, "=", 2)
1551 k := strings.ToLower(kv[0])
1552 var v string
1553 if len(kv) == 2 {
1554 v = kv[1]
1555 }
1556 uc.supportedCaps[k] = v
1557 }
1558}
1559
1560func (uc *upstreamConn) requestCaps() {
1561 var requestCaps []string
1562 for c := range permanentUpstreamCaps {
1563 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1564 requestCaps = append(requestCaps, c)
1565 }
1566 }
1567
1568 if uc.requestSASL() && !uc.caps["sasl"] {
1569 requestCaps = append(requestCaps, "sasl")
1570 }
1571
1572 if len(requestCaps) == 0 {
1573 return
1574 }
1575
1576 uc.SendMessage(&irc.Message{
1577 Command: "CAP",
1578 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1579 })
1580}
1581
1582func (uc *upstreamConn) requestSASL() bool {
1583 if uc.network.SASL.Mechanism == "" {
1584 return false
1585 }
1586
1587 v, ok := uc.supportedCaps["sasl"]
1588 if !ok {
1589 return false
1590 }
1591 if v != "" {
1592 mechanisms := strings.Split(v, ",")
1593 found := false
1594 for _, mech := range mechanisms {
1595 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1596 found = true
1597 break
1598 }
1599 }
1600 if !found {
1601 return false
1602 }
1603 }
1604
1605 return true
1606}
1607
1608func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1609 uc.caps[name] = ok
1610
1611 switch name {
1612 case "sasl":
1613 if !ok {
1614 uc.logger.Printf("server refused to acknowledge the SASL capability")
1615 return nil
1616 }
1617
1618 auth := &uc.network.SASL
1619 switch auth.Mechanism {
1620 case "PLAIN":
1621 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1622 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1623 case "EXTERNAL":
1624 uc.logger.Printf("starting SASL EXTERNAL authentication")
1625 uc.saslClient = sasl.NewExternalClient("")
1626 default:
1627 return fmt.Errorf("unsupported SASL mechanism %q", name)
1628 }
1629
1630 uc.SendMessage(&irc.Message{
1631 Command: "AUTHENTICATE",
1632 Params: []string{auth.Mechanism},
1633 })
1634 default:
1635 if permanentUpstreamCaps[name] {
1636 break
1637 }
1638 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1639 }
1640 return nil
1641}
1642
1643func splitSpace(s string) []string {
1644 return strings.FieldsFunc(s, func(r rune) bool {
1645 return r == ' '
1646 })
1647}
1648
1649func (uc *upstreamConn) register() {
1650 uc.nick = uc.network.Nick
1651 uc.nickCM = uc.network.casemap(uc.nick)
1652 uc.username = uc.network.GetUsername()
1653 uc.realname = uc.network.GetRealname()
1654
1655 uc.SendMessage(&irc.Message{
1656 Command: "CAP",
1657 Params: []string{"LS", "302"},
1658 })
1659
1660 if uc.network.Pass != "" {
1661 uc.SendMessage(&irc.Message{
1662 Command: "PASS",
1663 Params: []string{uc.network.Pass},
1664 })
1665 }
1666
1667 uc.SendMessage(&irc.Message{
1668 Command: "NICK",
1669 Params: []string{uc.nick},
1670 })
1671 uc.SendMessage(&irc.Message{
1672 Command: "USER",
1673 Params: []string{uc.username, "0", "*", uc.realname},
1674 })
1675}
1676
1677func (uc *upstreamConn) runUntilRegistered() error {
1678 for !uc.registered {
1679 msg, err := uc.ReadMessage()
1680 if err != nil {
1681 return fmt.Errorf("failed to read message: %v", err)
1682 }
1683
1684 if err := uc.handleMessage(msg); err != nil {
1685 if _, ok := err.(registrationError); ok {
1686 return err
1687 } else {
1688 msg.Tags = nil // prevent message tags from cluttering logs
1689 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1690 }
1691 }
1692 }
1693
1694 for _, command := range uc.network.ConnectCommands {
1695 m, err := irc.ParseMessage(command)
1696 if err != nil {
1697 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1698 } else {
1699 uc.SendMessage(m)
1700 }
1701 }
1702
1703 return nil
1704}
1705
1706func (uc *upstreamConn) readMessages(ch chan<- event) error {
1707 for {
1708 msg, err := uc.ReadMessage()
1709 if err == io.EOF {
1710 break
1711 } else if err != nil {
1712 return fmt.Errorf("failed to read IRC command: %v", err)
1713 }
1714
1715 ch <- eventUpstreamMessage{msg, uc}
1716 }
1717
1718 return nil
1719}
1720
1721func (uc *upstreamConn) SendMessage(msg *irc.Message) {
1722 if !uc.caps["message-tags"] {
1723 msg = msg.Copy()
1724 msg.Tags = nil
1725 }
1726
1727 uc.conn.SendMessage(msg)
1728}
1729
1730func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1731 if uc.caps["labeled-response"] {
1732 if msg.Tags == nil {
1733 msg.Tags = make(map[string]irc.TagValue)
1734 }
1735 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1736 uc.nextLabelID++
1737 }
1738 uc.SendMessage(msg)
1739}
1740
1741// appendLog appends a message to the log file.
1742//
1743// The internal message ID is returned. If the message isn't recorded in the
1744// log file, an empty string is returned.
1745func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) (msgID string) {
1746 if uc.user.msgStore == nil {
1747 return ""
1748 }
1749
1750 entityCM := uc.network.casemap(entity)
1751 if entityCM == "nickserv" {
1752 // The messages sent/received from NickServ may contain
1753 // security-related information (like passwords). Don't store these.
1754 return ""
1755 }
1756
1757 if !uc.network.delivered.HasTarget(entity) {
1758 // This is the first message we receive from this target. Save the last
1759 // message ID in delivery receipts, so that we can send the new message
1760 // in the backlog if an offline client reconnects.
1761 lastID, err := uc.user.msgStore.LastMsgID(uc.network, entityCM, time.Now())
1762 if err != nil {
1763 uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
1764 return ""
1765 }
1766
1767 uc.network.delivered.ForEachClient(func(clientName string) {
1768 uc.network.delivered.StoreID(entity, clientName, lastID)
1769 })
1770 }
1771
1772 msgID, err := uc.user.msgStore.Append(uc.network, entityCM, msg)
1773 if err != nil {
1774 uc.logger.Printf("failed to log message: %v", err)
1775 return ""
1776 }
1777
1778 return msgID
1779}
1780
1781// produce appends a message to the logs and forwards it to connected downstream
1782// connections.
1783//
1784// If origin is not nil and origin doesn't support echo-message, the message is
1785// forwarded to all connections except origin.
1786func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1787 var msgID string
1788 if target != "" {
1789 msgID = uc.appendLog(target, msg)
1790 }
1791
1792 // Don't forward messages if it's a detached channel
1793 ch := uc.network.channels.Value(target)
1794 detached := ch != nil && ch.Detached
1795
1796 uc.forEachDownstream(func(dc *downstreamConn) {
1797 if !detached && (dc != origin || dc.caps["echo-message"]) {
1798 dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
1799 } else {
1800 dc.advanceMessageWithID(msg, msgID)
1801 }
1802 })
1803}
1804
1805func (uc *upstreamConn) updateAway() {
1806 away := true
1807 uc.forEachDownstream(func(*downstreamConn) {
1808 away = false
1809 })
1810 if away == uc.away {
1811 return
1812 }
1813 if away {
1814 uc.SendMessage(&irc.Message{
1815 Command: "AWAY",
1816 Params: []string{"Auto away"},
1817 })
1818 } else {
1819 uc.SendMessage(&irc.Message{
1820 Command: "AWAY",
1821 })
1822 }
1823 uc.away = away
1824}
1825
1826func (uc *upstreamConn) updateChannelAutoDetach(name string) {
1827 uch := uc.channels.Value(name)
1828 if uch == nil {
1829 return
1830 }
1831 ch := uc.network.channels.Value(name)
1832 if ch == nil || ch.Detached {
1833 return
1834 }
1835 uch.updateAutoDetach(ch.DetachAfter)
1836}
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