source: code/trunk/downstream.go@ 411

Last change on this file since 411 was 411, checked in by contact, 5 years ago

Allow '/' in nickname

This allows to specify a network name in the nickname.

Closes: ​https://todo.sr.ht/~emersion/soju/91
File size: 41.5 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
61// '*' and '?' break masks
62const illegalNickChars = " :@!*?"
63
64// permanentDownstreamCaps is the list of always-supported downstream
65// capabilities.
66var permanentDownstreamCaps = map[string]string{
67 "batch": "",
68 "cap-notify": "",
69 "echo-message": "",
70 "message-tags": "",
71 "sasl": "PLAIN",
72 "server-time": "",
73}
74
75// needAllDownstreamCaps is the list of downstream capabilities that
76// require support from all upstreams to be enabled
77var needAllDownstreamCaps = map[string]string{
78 "away-notify": "",
79 "multi-prefix": "",
80}
81
82type downstreamConn struct {
83 conn
84
85 id uint64
86
87 registered bool
88 user *user
89 nick string
90 rawUsername string
91 networkName string
92 clientName string
93 realname string
94 hostname string
95 password string // empty after authentication
96 network *network // can be nil
97
98 negociatingCaps bool
99 capVersion int
100 supportedCaps map[string]string
101 caps map[string]bool
102
103 saslServer sasl.Server
104}
105
106func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
107 remoteAddr := ic.RemoteAddr().String()
108 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
109 options := connOptions{Logger: logger}
110 dc := &downstreamConn{
111 conn: *newConn(srv, ic, &options),
112 id: id,
113 supportedCaps: make(map[string]string),
114 caps: make(map[string]bool),
115 }
116 dc.hostname = remoteAddr
117 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
118 dc.hostname = host
119 }
120 for k, v := range permanentDownstreamCaps {
121 dc.supportedCaps[k] = v
122 }
123 if srv.LogPath != "" {
124 dc.supportedCaps["draft/chathistory"] = ""
125 }
126 return dc
127}
128
129func (dc *downstreamConn) prefix() *irc.Prefix {
130 return &irc.Prefix{
131 Name: dc.nick,
132 User: dc.user.Username,
133 Host: dc.hostname,
134 }
135}
136
137func (dc *downstreamConn) forEachNetwork(f func(*network)) {
138 if dc.network != nil {
139 f(dc.network)
140 } else {
141 dc.user.forEachNetwork(f)
142 }
143}
144
145func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
146 dc.user.forEachUpstream(func(uc *upstreamConn) {
147 if dc.network != nil && uc.network != dc.network {
148 return
149 }
150 f(uc)
151 })
152}
153
154// upstream returns the upstream connection, if any. If there are zero or if
155// there are multiple upstream connections, it returns nil.
156func (dc *downstreamConn) upstream() *upstreamConn {
157 if dc.network == nil {
158 return nil
159 }
160 return dc.network.conn
161}
162
163func isOurNick(net *network, nick string) bool {
164 // TODO: this doesn't account for nick changes
165 if net.conn != nil {
166 return nick == net.conn.nick
167 }
168 // We're not currently connected to the upstream connection, so we don't
169 // know whether this name is our nickname. Best-effort: use the network's
170 // configured nickname and hope it was the one being used when we were
171 // connected.
172 return nick == net.Nick
173}
174
175// marshalEntity converts an upstream entity name (ie. channel or nick) into a
176// downstream entity name.
177//
178// This involves adding a "/<network>" suffix if the entity isn't the current
179// user.
180func (dc *downstreamConn) marshalEntity(net *network, name string) string {
181 if isOurNick(net, name) {
182 return dc.nick
183 }
184 if dc.network != nil {
185 if dc.network != net {
186 panic("soju: tried to marshal an entity for another network")
187 }
188 return name
189 }
190 return name + "/" + net.GetName()
191}
192
193func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
194 if isOurNick(net, prefix.Name) {
195 return dc.prefix()
196 }
197 if dc.network != nil {
198 if dc.network != net {
199 panic("soju: tried to marshal a user prefix for another network")
200 }
201 return prefix
202 }
203 return &irc.Prefix{
204 Name: prefix.Name + "/" + net.GetName(),
205 User: prefix.User,
206 Host: prefix.Host,
207 }
208}
209
210// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
211// an upstream entity name.
212//
213// This involves removing the "/<network>" suffix.
214func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
215 if uc := dc.upstream(); uc != nil {
216 return uc, name, nil
217 }
218
219 var conn *upstreamConn
220 if i := strings.LastIndexByte(name, '/'); i >= 0 {
221 network := name[i+1:]
222 name = name[:i]
223
224 dc.forEachUpstream(func(uc *upstreamConn) {
225 if network != uc.network.GetName() {
226 return
227 }
228 conn = uc
229 })
230 }
231
232 if conn == nil {
233 return nil, "", ircError{&irc.Message{
234 Command: irc.ERR_NOSUCHCHANNEL,
235 Params: []string{name, "No such channel"},
236 }}
237 }
238 return conn, name, nil
239}
240
241func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
242 if dc.upstream() != nil {
243 return text
244 }
245 // TODO: smarter parsing that ignores URLs
246 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
247}
248
249func (dc *downstreamConn) readMessages(ch chan<- event) error {
250 for {
251 msg, err := dc.ReadMessage()
252 if err == io.EOF {
253 break
254 } else if err != nil {
255 return fmt.Errorf("failed to read IRC command: %v", err)
256 }
257
258 ch <- eventDownstreamMessage{msg, dc}
259 }
260
261 return nil
262}
263
264// SendMessage sends an outgoing message.
265//
266// This can only called from the user goroutine.
267func (dc *downstreamConn) SendMessage(msg *irc.Message) {
268 if !dc.caps["message-tags"] {
269 if msg.Command == "TAGMSG" {
270 return
271 }
272 msg = msg.Copy()
273 for name := range msg.Tags {
274 supported := false
275 switch name {
276 case "time":
277 supported = dc.caps["server-time"]
278 }
279 if !supported {
280 delete(msg.Tags, name)
281 }
282 }
283 }
284
285 dc.conn.SendMessage(msg)
286}
287
288// marshalMessage re-formats a message coming from an upstream connection so
289// that it's suitable for being sent on this downstream connection. Only
290// messages that may appear in logs are supported, except MODE.
291func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
292 msg = msg.Copy()
293 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
294
295 switch msg.Command {
296 case "PRIVMSG", "NOTICE", "TAGMSG":
297 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
298 case "NICK":
299 // Nick change for another user
300 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
301 case "JOIN", "PART":
302 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
303 case "KICK":
304 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
305 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
306 case "TOPIC":
307 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
308 case "QUIT":
309 // This space is intentionally left blank
310 default:
311 panic(fmt.Sprintf("unexpected %q message", msg.Command))
312 }
313
314 return msg
315}
316
317func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
318 switch msg.Command {
319 case "QUIT":
320 return dc.Close()
321 default:
322 if dc.registered {
323 return dc.handleMessageRegistered(msg)
324 } else {
325 return dc.handleMessageUnregistered(msg)
326 }
327 }
328}
329
330func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
331 switch msg.Command {
332 case "NICK":
333 var nick string
334 if err := parseMessageParams(msg, &nick); err != nil {
335 return err
336 }
337 if strings.ContainsAny(nick, illegalNickChars) {
338 return ircError{&irc.Message{
339 Command: irc.ERR_ERRONEUSNICKNAME,
340 Params: []string{dc.nick, nick, "contains illegal characters"},
341 }}
342 }
343 if nick == serviceNick {
344 return ircError{&irc.Message{
345 Command: irc.ERR_NICKNAMEINUSE,
346 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
347 }}
348 }
349 dc.nick = nick
350 case "USER":
351 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
352 return err
353 }
354 case "PASS":
355 if err := parseMessageParams(msg, &dc.password); err != nil {
356 return err
357 }
358 case "CAP":
359 var subCmd string
360 if err := parseMessageParams(msg, &subCmd); err != nil {
361 return err
362 }
363 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
364 return err
365 }
366 case "AUTHENTICATE":
367 if !dc.caps["sasl"] {
368 return ircError{&irc.Message{
369 Command: irc.ERR_SASLFAIL,
370 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
371 }}
372 }
373 if len(msg.Params) == 0 {
374 return ircError{&irc.Message{
375 Command: irc.ERR_SASLFAIL,
376 Params: []string{"*", "Missing AUTHENTICATE argument"},
377 }}
378 }
379 if dc.nick == "" {
380 return ircError{&irc.Message{
381 Command: irc.ERR_SASLFAIL,
382 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
383 }}
384 }
385
386 var resp []byte
387 if dc.saslServer == nil {
388 mech := strings.ToUpper(msg.Params[0])
389 switch mech {
390 case "PLAIN":
391 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
392 return dc.authenticate(username, password)
393 }))
394 default:
395 return ircError{&irc.Message{
396 Command: irc.ERR_SASLFAIL,
397 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
398 }}
399 }
400 } else if msg.Params[0] == "*" {
401 dc.saslServer = nil
402 return ircError{&irc.Message{
403 Command: irc.ERR_SASLABORTED,
404 Params: []string{"*", "SASL authentication aborted"},
405 }}
406 } else if msg.Params[0] == "+" {
407 resp = nil
408 } else {
409 // TODO: multi-line messages
410 var err error
411 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
412 if err != nil {
413 dc.saslServer = nil
414 return ircError{&irc.Message{
415 Command: irc.ERR_SASLFAIL,
416 Params: []string{"*", "Invalid base64-encoded response"},
417 }}
418 }
419 }
420
421 challenge, done, err := dc.saslServer.Next(resp)
422 if err != nil {
423 dc.saslServer = nil
424 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
425 return ircError{&irc.Message{
426 Command: irc.ERR_SASLFAIL,
427 Params: []string{"*", ircErr.Message.Params[1]},
428 }}
429 }
430 dc.SendMessage(&irc.Message{
431 Prefix: dc.srv.prefix(),
432 Command: irc.ERR_SASLFAIL,
433 Params: []string{"*", "SASL error"},
434 })
435 return fmt.Errorf("SASL authentication failed: %v", err)
436 } else if done {
437 dc.saslServer = nil
438 dc.SendMessage(&irc.Message{
439 Prefix: dc.srv.prefix(),
440 Command: irc.RPL_LOGGEDIN,
441 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
442 })
443 dc.SendMessage(&irc.Message{
444 Prefix: dc.srv.prefix(),
445 Command: irc.RPL_SASLSUCCESS,
446 Params: []string{dc.nick, "SASL authentication successful"},
447 })
448 } else {
449 challengeStr := "+"
450 if len(challenge) > 0 {
451 challengeStr = base64.StdEncoding.EncodeToString(challenge)
452 }
453
454 // TODO: multi-line messages
455 dc.SendMessage(&irc.Message{
456 Prefix: dc.srv.prefix(),
457 Command: "AUTHENTICATE",
458 Params: []string{challengeStr},
459 })
460 }
461 default:
462 dc.logger.Printf("unhandled message: %v", msg)
463 return newUnknownCommandError(msg.Command)
464 }
465 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
466 return dc.register()
467 }
468 return nil
469}
470
471func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
472 cmd = strings.ToUpper(cmd)
473
474 replyTo := dc.nick
475 if !dc.registered {
476 replyTo = "*"
477 }
478
479 switch cmd {
480 case "LS":
481 if len(args) > 0 {
482 var err error
483 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
484 return err
485 }
486 }
487
488 caps := make([]string, 0, len(dc.supportedCaps))
489 for k, v := range dc.supportedCaps {
490 if dc.capVersion >= 302 && v != "" {
491 caps = append(caps, k+"="+v)
492 } else {
493 caps = append(caps, k)
494 }
495 }
496
497 // TODO: multi-line replies
498 dc.SendMessage(&irc.Message{
499 Prefix: dc.srv.prefix(),
500 Command: "CAP",
501 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
502 })
503
504 if dc.capVersion >= 302 {
505 // CAP version 302 implicitly enables cap-notify
506 dc.caps["cap-notify"] = true
507 }
508
509 if !dc.registered {
510 dc.negociatingCaps = true
511 }
512 case "LIST":
513 var caps []string
514 for name := range dc.caps {
515 caps = append(caps, name)
516 }
517
518 // TODO: multi-line replies
519 dc.SendMessage(&irc.Message{
520 Prefix: dc.srv.prefix(),
521 Command: "CAP",
522 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
523 })
524 case "REQ":
525 if len(args) == 0 {
526 return ircError{&irc.Message{
527 Command: err_invalidcapcmd,
528 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
529 }}
530 }
531
532 // TODO: atomically ack/nak the whole capability set
533 caps := strings.Fields(args[0])
534 ack := true
535 for _, name := range caps {
536 name = strings.ToLower(name)
537 enable := !strings.HasPrefix(name, "-")
538 if !enable {
539 name = strings.TrimPrefix(name, "-")
540 }
541
542 if enable == dc.caps[name] {
543 continue
544 }
545
546 _, ok := dc.supportedCaps[name]
547 if !ok {
548 ack = false
549 break
550 }
551
552 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
553 // cap-notify cannot be disabled with CAP version 302
554 ack = false
555 break
556 }
557
558 dc.caps[name] = enable
559 }
560
561 reply := "NAK"
562 if ack {
563 reply = "ACK"
564 }
565 dc.SendMessage(&irc.Message{
566 Prefix: dc.srv.prefix(),
567 Command: "CAP",
568 Params: []string{replyTo, reply, args[0]},
569 })
570 case "END":
571 dc.negociatingCaps = false
572 default:
573 return ircError{&irc.Message{
574 Command: err_invalidcapcmd,
575 Params: []string{replyTo, cmd, "Unknown CAP command"},
576 }}
577 }
578 return nil
579}
580
581func (dc *downstreamConn) setSupportedCap(name, value string) {
582 prevValue, hasPrev := dc.supportedCaps[name]
583 changed := !hasPrev || prevValue != value
584 dc.supportedCaps[name] = value
585
586 if !dc.caps["cap-notify"] || !changed {
587 return
588 }
589
590 replyTo := dc.nick
591 if !dc.registered {
592 replyTo = "*"
593 }
594
595 cap := name
596 if value != "" && dc.capVersion >= 302 {
597 cap = name + "=" + value
598 }
599
600 dc.SendMessage(&irc.Message{
601 Prefix: dc.srv.prefix(),
602 Command: "CAP",
603 Params: []string{replyTo, "NEW", cap},
604 })
605}
606
607func (dc *downstreamConn) unsetSupportedCap(name string) {
608 _, hasPrev := dc.supportedCaps[name]
609 delete(dc.supportedCaps, name)
610 delete(dc.caps, name)
611
612 if !dc.caps["cap-notify"] || !hasPrev {
613 return
614 }
615
616 replyTo := dc.nick
617 if !dc.registered {
618 replyTo = "*"
619 }
620
621 dc.SendMessage(&irc.Message{
622 Prefix: dc.srv.prefix(),
623 Command: "CAP",
624 Params: []string{replyTo, "DEL", name},
625 })
626}
627
628func (dc *downstreamConn) updateSupportedCaps() {
629 supportedCaps := make(map[string]bool)
630 for cap := range needAllDownstreamCaps {
631 supportedCaps[cap] = true
632 }
633 dc.forEachUpstream(func(uc *upstreamConn) {
634 for cap, supported := range supportedCaps {
635 supportedCaps[cap] = supported && uc.caps[cap]
636 }
637 })
638
639 for cap, supported := range supportedCaps {
640 if supported {
641 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
642 } else {
643 dc.unsetSupportedCap(cap)
644 }
645 }
646}
647
648func (dc *downstreamConn) updateNick() {
649 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
650 dc.SendMessage(&irc.Message{
651 Prefix: dc.prefix(),
652 Command: "NICK",
653 Params: []string{uc.nick},
654 })
655 dc.nick = uc.nick
656 }
657}
658
659func sanityCheckServer(addr string) error {
660 dialer := net.Dialer{Timeout: 30 * time.Second}
661 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
662 if err != nil {
663 return err
664 }
665 return conn.Close()
666}
667
668func unmarshalUsername(rawUsername string) (username, client, network string) {
669 username = rawUsername
670
671 i := strings.IndexAny(username, "/@")
672 j := strings.LastIndexAny(username, "/@")
673 if i >= 0 {
674 username = rawUsername[:i]
675 }
676 if j >= 0 {
677 if rawUsername[j] == '@' {
678 client = rawUsername[j+1:]
679 } else {
680 network = rawUsername[j+1:]
681 }
682 }
683 if i >= 0 && j >= 0 && i < j {
684 if rawUsername[i] == '@' {
685 client = rawUsername[i+1 : j]
686 } else {
687 network = rawUsername[i+1 : j]
688 }
689 }
690
691 return username, client, network
692}
693
694func (dc *downstreamConn) authenticate(username, password string) error {
695 username, clientName, networkName := unmarshalUsername(username)
696
697 u, err := dc.srv.db.GetUser(username)
698 if err != nil {
699 dc.logger.Printf("failed authentication for %q: %v", username, err)
700 return errAuthFailed
701 }
702
703 // Password auth disabled
704 if u.Password == "" {
705 return errAuthFailed
706 }
707
708 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
709 if err != nil {
710 dc.logger.Printf("failed authentication for %q: %v", username, err)
711 return errAuthFailed
712 }
713
714 dc.user = dc.srv.getUser(username)
715 if dc.user == nil {
716 dc.logger.Printf("failed authentication for %q: user not active", username)
717 return errAuthFailed
718 }
719 dc.clientName = clientName
720 dc.networkName = networkName
721 return nil
722}
723
724func (dc *downstreamConn) register() error {
725 if dc.registered {
726 return fmt.Errorf("tried to register twice")
727 }
728
729 password := dc.password
730 dc.password = ""
731 if dc.user == nil {
732 if err := dc.authenticate(dc.rawUsername, password); err != nil {
733 return err
734 }
735 }
736
737 if dc.clientName == "" && dc.networkName == "" {
738 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
739 }
740
741 dc.registered = true
742 dc.logger.Printf("registration complete for user %q", dc.user.Username)
743 return nil
744}
745
746func (dc *downstreamConn) loadNetwork() error {
747 if dc.networkName == "" {
748 return nil
749 }
750
751 network := dc.user.getNetwork(dc.networkName)
752 if network == nil {
753 addr := dc.networkName
754 if !strings.ContainsRune(addr, ':') {
755 addr = addr + ":6697"
756 }
757
758 dc.logger.Printf("trying to connect to new network %q", addr)
759 if err := sanityCheckServer(addr); err != nil {
760 dc.logger.Printf("failed to connect to %q: %v", addr, err)
761 return ircError{&irc.Message{
762 Command: irc.ERR_PASSWDMISMATCH,
763 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
764 }}
765 }
766
767 // Some clients only allow specifying the nickname (and use the
768 // nickname as a username too). Strip the network name from the
769 // nickname when auto-saving networks.
770 nick, _, _ := unmarshalUsername(dc.nick)
771
772 dc.logger.Printf("auto-saving network %q", dc.networkName)
773 var err error
774 network, err = dc.user.createNetwork(&Network{
775 Addr: dc.networkName,
776 Nick: nick,
777 })
778 if err != nil {
779 return err
780 }
781 }
782
783 dc.network = network
784 return nil
785}
786
787func (dc *downstreamConn) welcome() error {
788 if dc.user == nil || !dc.registered {
789 panic("tried to welcome an unregistered connection")
790 }
791
792 // TODO: doing this might take some time. We should do it in dc.register
793 // instead, but we'll potentially be adding a new network and this must be
794 // done in the user goroutine.
795 if err := dc.loadNetwork(); err != nil {
796 return err
797 }
798
799 dc.SendMessage(&irc.Message{
800 Prefix: dc.srv.prefix(),
801 Command: irc.RPL_WELCOME,
802 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
803 })
804 dc.SendMessage(&irc.Message{
805 Prefix: dc.srv.prefix(),
806 Command: irc.RPL_YOURHOST,
807 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
808 })
809 dc.SendMessage(&irc.Message{
810 Prefix: dc.srv.prefix(),
811 Command: irc.RPL_CREATED,
812 Params: []string{dc.nick, "Who cares when the server was created?"},
813 })
814 dc.SendMessage(&irc.Message{
815 Prefix: dc.srv.prefix(),
816 Command: irc.RPL_MYINFO,
817 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
818 })
819 // TODO: RPL_ISUPPORT
820 // TODO: send CHATHISTORY in RPL_ISUPPORT when implemented
821 dc.SendMessage(&irc.Message{
822 Prefix: dc.srv.prefix(),
823 Command: irc.ERR_NOMOTD,
824 Params: []string{dc.nick, "No MOTD"},
825 })
826
827 dc.updateNick()
828
829 dc.forEachUpstream(func(uc *upstreamConn) {
830 for _, ch := range uc.channels {
831 if !ch.complete {
832 continue
833 }
834 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
835 continue
836 }
837
838 dc.SendMessage(&irc.Message{
839 Prefix: dc.prefix(),
840 Command: "JOIN",
841 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
842 })
843
844 forwardChannel(dc, ch)
845 }
846 })
847
848 dc.forEachNetwork(func(net *network) {
849 // Only send history if we're the first connected client with that name
850 // for the network
851 if _, ok := net.offlineClients[dc.clientName]; ok {
852 dc.sendNetworkHistory(net)
853 delete(net.offlineClients, dc.clientName)
854 }
855
856 // Fast-forward history to last message
857 for target, history := range net.history {
858 if ch, ok := net.channels[target]; ok && ch.Detached {
859 continue
860 }
861
862 lastID, err := lastMsgID(net, target, time.Now())
863 if err != nil {
864 dc.logger.Printf("failed to get last message ID: %v", err)
865 continue
866 }
867 history.clients[dc.clientName] = lastID
868 }
869 })
870
871 return nil
872}
873
874func (dc *downstreamConn) sendNetworkHistory(net *network) {
875 if dc.caps["draft/chathistory"] || dc.srv.LogPath == "" {
876 return
877 }
878 for target, history := range net.history {
879 if ch, ok := net.channels[target]; ok && ch.Detached {
880 continue
881 }
882
883 lastDelivered, ok := history.clients[dc.clientName]
884 if !ok {
885 continue
886 }
887
888 limit := 4000
889 history, err := loadHistoryLatestID(dc.network, target, lastDelivered, limit)
890 if err != nil {
891 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
892 continue
893 }
894
895 batchRef := "history"
896 if dc.caps["batch"] {
897 dc.SendMessage(&irc.Message{
898 Prefix: dc.srv.prefix(),
899 Command: "BATCH",
900 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
901 })
902 }
903
904 for _, msg := range history {
905 // Don't replay all messages, because that would mess up client
906 // state. For instance we just sent the list of users, sending
907 // PART messages for one of these users would be incorrect.
908 ignore := true
909 switch msg.Command {
910 case "PRIVMSG", "NOTICE":
911 ignore = false
912 }
913 if ignore {
914 continue
915 }
916
917 if dc.caps["batch"] {
918 msg.Tags["batch"] = irc.TagValue(batchRef)
919 }
920 dc.SendMessage(dc.marshalMessage(msg, net))
921 }
922
923 if dc.caps["batch"] {
924 dc.SendMessage(&irc.Message{
925 Prefix: dc.srv.prefix(),
926 Command: "BATCH",
927 Params: []string{"-" + batchRef},
928 })
929 }
930 }
931}
932
933func (dc *downstreamConn) runUntilRegistered() error {
934 for !dc.registered {
935 msg, err := dc.ReadMessage()
936 if err != nil {
937 return fmt.Errorf("failed to read IRC command: %v", err)
938 }
939
940 err = dc.handleMessage(msg)
941 if ircErr, ok := err.(ircError); ok {
942 ircErr.Message.Prefix = dc.srv.prefix()
943 dc.SendMessage(ircErr.Message)
944 } else if err != nil {
945 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
946 }
947 }
948
949 return nil
950}
951
952func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
953 switch msg.Command {
954 case "CAP":
955 var subCmd string
956 if err := parseMessageParams(msg, &subCmd); err != nil {
957 return err
958 }
959 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
960 return err
961 }
962 case "PING":
963 dc.SendMessage(&irc.Message{
964 Prefix: dc.srv.prefix(),
965 Command: "PONG",
966 Params: msg.Params,
967 })
968 return nil
969 case "USER":
970 return ircError{&irc.Message{
971 Command: irc.ERR_ALREADYREGISTERED,
972 Params: []string{dc.nick, "You may not reregister"},
973 }}
974 case "NICK":
975 var nick string
976 if err := parseMessageParams(msg, &nick); err != nil {
977 return err
978 }
979
980 var upstream *upstreamConn
981 if dc.upstream() == nil {
982 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
983 if err == nil { // NICK nick/network: NICK only on a specific upstream
984 upstream = uc
985 nick = unmarshaledNick
986 }
987 }
988
989 if strings.ContainsAny(nick, illegalNickChars) {
990 return ircError{&irc.Message{
991 Command: irc.ERR_ERRONEUSNICKNAME,
992 Params: []string{dc.nick, nick, "contains illegal characters"},
993 }}
994 }
995
996 var err error
997 dc.forEachNetwork(func(n *network) {
998 if err != nil || (upstream != nil && upstream.network != n) {
999 return
1000 }
1001 n.Nick = nick
1002 err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
1003 })
1004 if err != nil {
1005 return err
1006 }
1007
1008 dc.forEachUpstream(func(uc *upstreamConn) {
1009 if upstream != nil && upstream != uc {
1010 return
1011 }
1012 uc.SendMessageLabeled(dc.id, &irc.Message{
1013 Command: "NICK",
1014 Params: []string{nick},
1015 })
1016 })
1017
1018 if dc.upstream() == nil && dc.nick != nick {
1019 dc.SendMessage(&irc.Message{
1020 Prefix: dc.prefix(),
1021 Command: "NICK",
1022 Params: []string{nick},
1023 })
1024 dc.nick = nick
1025 }
1026 case "JOIN":
1027 var namesStr string
1028 if err := parseMessageParams(msg, &namesStr); err != nil {
1029 return err
1030 }
1031
1032 var keys []string
1033 if len(msg.Params) > 1 {
1034 keys = strings.Split(msg.Params[1], ",")
1035 }
1036
1037 for i, name := range strings.Split(namesStr, ",") {
1038 uc, upstreamName, err := dc.unmarshalEntity(name)
1039 if err != nil {
1040 return err
1041 }
1042
1043 var key string
1044 if len(keys) > i {
1045 key = keys[i]
1046 }
1047
1048 params := []string{upstreamName}
1049 if key != "" {
1050 params = append(params, key)
1051 }
1052 uc.SendMessageLabeled(dc.id, &irc.Message{
1053 Command: "JOIN",
1054 Params: params,
1055 })
1056
1057 ch := &Channel{Name: upstreamName, Key: key, Detached: false}
1058 if current, ok := uc.network.channels[ch.Name]; ok && key == "" {
1059 // Don't clear the channel key if there's one set
1060 // TODO: add a way to unset the channel key
1061 ch.Key = current.Key
1062 }
1063 if err := uc.network.createUpdateChannel(ch); err != nil {
1064 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1065 }
1066 }
1067 case "PART":
1068 var namesStr string
1069 if err := parseMessageParams(msg, &namesStr); err != nil {
1070 return err
1071 }
1072
1073 var reason string
1074 if len(msg.Params) > 1 {
1075 reason = msg.Params[1]
1076 }
1077
1078 for _, name := range strings.Split(namesStr, ",") {
1079 uc, upstreamName, err := dc.unmarshalEntity(name)
1080 if err != nil {
1081 return err
1082 }
1083
1084 if strings.EqualFold(reason, "detach") {
1085 ch := &Channel{Name: upstreamName, Detached: true}
1086 if err := uc.network.createUpdateChannel(ch); err != nil {
1087 dc.logger.Printf("failed to detach channel %q: %v", upstreamName, err)
1088 }
1089 } else {
1090 params := []string{upstreamName}
1091 if reason != "" {
1092 params = append(params, reason)
1093 }
1094 uc.SendMessageLabeled(dc.id, &irc.Message{
1095 Command: "PART",
1096 Params: params,
1097 })
1098
1099 if err := uc.network.deleteChannel(upstreamName); err != nil {
1100 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1101 }
1102 }
1103 }
1104 case "KICK":
1105 var channelStr, userStr string
1106 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1107 return err
1108 }
1109
1110 channels := strings.Split(channelStr, ",")
1111 users := strings.Split(userStr, ",")
1112
1113 var reason string
1114 if len(msg.Params) > 2 {
1115 reason = msg.Params[2]
1116 }
1117
1118 if len(channels) != 1 && len(channels) != len(users) {
1119 return ircError{&irc.Message{
1120 Command: irc.ERR_BADCHANMASK,
1121 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1122 }}
1123 }
1124
1125 for i, user := range users {
1126 var channel string
1127 if len(channels) == 1 {
1128 channel = channels[0]
1129 } else {
1130 channel = channels[i]
1131 }
1132
1133 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1134 if err != nil {
1135 return err
1136 }
1137
1138 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1139 if err != nil {
1140 return err
1141 }
1142
1143 if ucChannel != ucUser {
1144 return ircError{&irc.Message{
1145 Command: irc.ERR_USERNOTINCHANNEL,
1146 Params: []string{dc.nick, user, channel, "They are on another network"},
1147 }}
1148 }
1149 uc := ucChannel
1150
1151 params := []string{upstreamChannel, upstreamUser}
1152 if reason != "" {
1153 params = append(params, reason)
1154 }
1155 uc.SendMessageLabeled(dc.id, &irc.Message{
1156 Command: "KICK",
1157 Params: params,
1158 })
1159 }
1160 case "MODE":
1161 var name string
1162 if err := parseMessageParams(msg, &name); err != nil {
1163 return err
1164 }
1165
1166 var modeStr string
1167 if len(msg.Params) > 1 {
1168 modeStr = msg.Params[1]
1169 }
1170
1171 if name == dc.nick {
1172 if modeStr != "" {
1173 dc.forEachUpstream(func(uc *upstreamConn) {
1174 uc.SendMessageLabeled(dc.id, &irc.Message{
1175 Command: "MODE",
1176 Params: []string{uc.nick, modeStr},
1177 })
1178 })
1179 } else {
1180 dc.SendMessage(&irc.Message{
1181 Prefix: dc.srv.prefix(),
1182 Command: irc.RPL_UMODEIS,
1183 Params: []string{dc.nick, ""}, // TODO
1184 })
1185 }
1186 return nil
1187 }
1188
1189 uc, upstreamName, err := dc.unmarshalEntity(name)
1190 if err != nil {
1191 return err
1192 }
1193
1194 if !uc.isChannel(upstreamName) {
1195 return ircError{&irc.Message{
1196 Command: irc.ERR_USERSDONTMATCH,
1197 Params: []string{dc.nick, "Cannot change mode for other users"},
1198 }}
1199 }
1200
1201 if modeStr != "" {
1202 params := []string{upstreamName, modeStr}
1203 params = append(params, msg.Params[2:]...)
1204 uc.SendMessageLabeled(dc.id, &irc.Message{
1205 Command: "MODE",
1206 Params: params,
1207 })
1208 } else {
1209 ch, ok := uc.channels[upstreamName]
1210 if !ok {
1211 return ircError{&irc.Message{
1212 Command: irc.ERR_NOSUCHCHANNEL,
1213 Params: []string{dc.nick, name, "No such channel"},
1214 }}
1215 }
1216
1217 if ch.modes == nil {
1218 // we haven't received the initial RPL_CHANNELMODEIS yet
1219 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1220 return nil
1221 }
1222
1223 modeStr, modeParams := ch.modes.Format()
1224 params := []string{dc.nick, name, modeStr}
1225 params = append(params, modeParams...)
1226
1227 dc.SendMessage(&irc.Message{
1228 Prefix: dc.srv.prefix(),
1229 Command: irc.RPL_CHANNELMODEIS,
1230 Params: params,
1231 })
1232 if ch.creationTime != "" {
1233 dc.SendMessage(&irc.Message{
1234 Prefix: dc.srv.prefix(),
1235 Command: rpl_creationtime,
1236 Params: []string{dc.nick, name, ch.creationTime},
1237 })
1238 }
1239 }
1240 case "TOPIC":
1241 var channel string
1242 if err := parseMessageParams(msg, &channel); err != nil {
1243 return err
1244 }
1245
1246 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1247 if err != nil {
1248 return err
1249 }
1250
1251 if len(msg.Params) > 1 { // setting topic
1252 topic := msg.Params[1]
1253 uc.SendMessageLabeled(dc.id, &irc.Message{
1254 Command: "TOPIC",
1255 Params: []string{upstreamChannel, topic},
1256 })
1257 } else { // getting topic
1258 ch, ok := uc.channels[upstreamChannel]
1259 if !ok {
1260 return ircError{&irc.Message{
1261 Command: irc.ERR_NOSUCHCHANNEL,
1262 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1263 }}
1264 }
1265 sendTopic(dc, ch)
1266 }
1267 case "LIST":
1268 // TODO: support ELIST when supported by all upstreams
1269
1270 pl := pendingLIST{
1271 downstreamID: dc.id,
1272 pendingCommands: make(map[int64]*irc.Message),
1273 }
1274 var upstream *upstreamConn
1275 var upstreamChannels map[int64][]string
1276 if len(msg.Params) > 0 {
1277 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1278 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1279 upstream = uc
1280 } else {
1281 upstreamChannels = make(map[int64][]string)
1282 channels := strings.Split(msg.Params[0], ",")
1283 for _, channel := range channels {
1284 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1285 if err != nil {
1286 return err
1287 }
1288 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1289 }
1290 }
1291 }
1292
1293 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1294 dc.forEachUpstream(func(uc *upstreamConn) {
1295 if upstream != nil && upstream != uc {
1296 return
1297 }
1298 var params []string
1299 if upstreamChannels != nil {
1300 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1301 params = []string{strings.Join(channels, ",")}
1302 } else {
1303 return
1304 }
1305 }
1306 pl.pendingCommands[uc.network.ID] = &irc.Message{
1307 Command: "LIST",
1308 Params: params,
1309 }
1310 uc.trySendLIST(dc.id)
1311 })
1312 case "NAMES":
1313 if len(msg.Params) == 0 {
1314 dc.SendMessage(&irc.Message{
1315 Prefix: dc.srv.prefix(),
1316 Command: irc.RPL_ENDOFNAMES,
1317 Params: []string{dc.nick, "*", "End of /NAMES list"},
1318 })
1319 return nil
1320 }
1321
1322 channels := strings.Split(msg.Params[0], ",")
1323 for _, channel := range channels {
1324 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1325 if err != nil {
1326 return err
1327 }
1328
1329 ch, ok := uc.channels[upstreamChannel]
1330 if ok {
1331 sendNames(dc, ch)
1332 } else {
1333 // NAMES on a channel we have not joined, ask upstream
1334 uc.SendMessageLabeled(dc.id, &irc.Message{
1335 Command: "NAMES",
1336 Params: []string{upstreamChannel},
1337 })
1338 }
1339 }
1340 case "WHO":
1341 if len(msg.Params) == 0 {
1342 // TODO: support WHO without parameters
1343 dc.SendMessage(&irc.Message{
1344 Prefix: dc.srv.prefix(),
1345 Command: irc.RPL_ENDOFWHO,
1346 Params: []string{dc.nick, "*", "End of /WHO list"},
1347 })
1348 return nil
1349 }
1350
1351 // TODO: support WHO masks
1352 entity := msg.Params[0]
1353
1354 if entity == dc.nick {
1355 // TODO: support AWAY (H/G) in self WHO reply
1356 dc.SendMessage(&irc.Message{
1357 Prefix: dc.srv.prefix(),
1358 Command: irc.RPL_WHOREPLY,
1359 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1360 })
1361 dc.SendMessage(&irc.Message{
1362 Prefix: dc.srv.prefix(),
1363 Command: irc.RPL_ENDOFWHO,
1364 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1365 })
1366 return nil
1367 }
1368 if entity == serviceNick {
1369 dc.SendMessage(&irc.Message{
1370 Prefix: dc.srv.prefix(),
1371 Command: irc.RPL_WHOREPLY,
1372 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1373 })
1374 dc.SendMessage(&irc.Message{
1375 Prefix: dc.srv.prefix(),
1376 Command: irc.RPL_ENDOFWHO,
1377 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1378 })
1379 return nil
1380 }
1381
1382 uc, upstreamName, err := dc.unmarshalEntity(entity)
1383 if err != nil {
1384 return err
1385 }
1386
1387 var params []string
1388 if len(msg.Params) == 2 {
1389 params = []string{upstreamName, msg.Params[1]}
1390 } else {
1391 params = []string{upstreamName}
1392 }
1393
1394 uc.SendMessageLabeled(dc.id, &irc.Message{
1395 Command: "WHO",
1396 Params: params,
1397 })
1398 case "WHOIS":
1399 if len(msg.Params) == 0 {
1400 return ircError{&irc.Message{
1401 Command: irc.ERR_NONICKNAMEGIVEN,
1402 Params: []string{dc.nick, "No nickname given"},
1403 }}
1404 }
1405
1406 var target, mask string
1407 if len(msg.Params) == 1 {
1408 target = ""
1409 mask = msg.Params[0]
1410 } else {
1411 target = msg.Params[0]
1412 mask = msg.Params[1]
1413 }
1414 // TODO: support multiple WHOIS users
1415 if i := strings.IndexByte(mask, ','); i >= 0 {
1416 mask = mask[:i]
1417 }
1418
1419 if mask == dc.nick {
1420 dc.SendMessage(&irc.Message{
1421 Prefix: dc.srv.prefix(),
1422 Command: irc.RPL_WHOISUSER,
1423 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1424 })
1425 dc.SendMessage(&irc.Message{
1426 Prefix: dc.srv.prefix(),
1427 Command: irc.RPL_WHOISSERVER,
1428 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1429 })
1430 dc.SendMessage(&irc.Message{
1431 Prefix: dc.srv.prefix(),
1432 Command: irc.RPL_ENDOFWHOIS,
1433 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1434 })
1435 return nil
1436 }
1437
1438 // TODO: support WHOIS masks
1439 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1440 if err != nil {
1441 return err
1442 }
1443
1444 var params []string
1445 if target != "" {
1446 if target == mask { // WHOIS nick nick
1447 params = []string{upstreamNick, upstreamNick}
1448 } else {
1449 params = []string{target, upstreamNick}
1450 }
1451 } else {
1452 params = []string{upstreamNick}
1453 }
1454
1455 uc.SendMessageLabeled(dc.id, &irc.Message{
1456 Command: "WHOIS",
1457 Params: params,
1458 })
1459 case "PRIVMSG":
1460 var targetsStr, text string
1461 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1462 return err
1463 }
1464 tags := copyClientTags(msg.Tags)
1465
1466 for _, name := range strings.Split(targetsStr, ",") {
1467 if name == serviceNick {
1468 handleServicePRIVMSG(dc, text)
1469 continue
1470 }
1471
1472 uc, upstreamName, err := dc.unmarshalEntity(name)
1473 if err != nil {
1474 return err
1475 }
1476
1477 if upstreamName == "NickServ" {
1478 dc.handleNickServPRIVMSG(uc, text)
1479 }
1480
1481 unmarshaledText := text
1482 if uc.isChannel(upstreamName) {
1483 unmarshaledText = dc.unmarshalText(uc, text)
1484 }
1485 uc.SendMessageLabeled(dc.id, &irc.Message{
1486 Tags: tags,
1487 Command: "PRIVMSG",
1488 Params: []string{upstreamName, unmarshaledText},
1489 })
1490
1491 echoTags := tags.Copy()
1492 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1493 echoMsg := &irc.Message{
1494 Tags: echoTags,
1495 Prefix: &irc.Prefix{
1496 Name: uc.nick,
1497 User: uc.username,
1498 },
1499 Command: "PRIVMSG",
1500 Params: []string{upstreamName, text},
1501 }
1502 uc.produce(upstreamName, echoMsg, dc)
1503 }
1504 case "NOTICE":
1505 var targetsStr, text string
1506 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1507 return err
1508 }
1509 tags := copyClientTags(msg.Tags)
1510
1511 for _, name := range strings.Split(targetsStr, ",") {
1512 uc, upstreamName, err := dc.unmarshalEntity(name)
1513 if err != nil {
1514 return err
1515 }
1516
1517 unmarshaledText := text
1518 if uc.isChannel(upstreamName) {
1519 unmarshaledText = dc.unmarshalText(uc, text)
1520 }
1521 uc.SendMessageLabeled(dc.id, &irc.Message{
1522 Tags: tags,
1523 Command: "NOTICE",
1524 Params: []string{upstreamName, unmarshaledText},
1525 })
1526 }
1527 case "TAGMSG":
1528 var targetsStr string
1529 if err := parseMessageParams(msg, &targetsStr); err != nil {
1530 return err
1531 }
1532 tags := copyClientTags(msg.Tags)
1533
1534 for _, name := range strings.Split(targetsStr, ",") {
1535 uc, upstreamName, err := dc.unmarshalEntity(name)
1536 if err != nil {
1537 return err
1538 }
1539
1540 uc.SendMessageLabeled(dc.id, &irc.Message{
1541 Tags: tags,
1542 Command: "TAGMSG",
1543 Params: []string{upstreamName},
1544 })
1545 }
1546 case "INVITE":
1547 var user, channel string
1548 if err := parseMessageParams(msg, &user, &channel); err != nil {
1549 return err
1550 }
1551
1552 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1553 if err != nil {
1554 return err
1555 }
1556
1557 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1558 if err != nil {
1559 return err
1560 }
1561
1562 if ucChannel != ucUser {
1563 return ircError{&irc.Message{
1564 Command: irc.ERR_USERNOTINCHANNEL,
1565 Params: []string{dc.nick, user, channel, "They are on another network"},
1566 }}
1567 }
1568 uc := ucChannel
1569
1570 uc.SendMessageLabeled(dc.id, &irc.Message{
1571 Command: "INVITE",
1572 Params: []string{upstreamUser, upstreamChannel},
1573 })
1574 case "CHATHISTORY":
1575 var subcommand string
1576 if err := parseMessageParams(msg, &subcommand); err != nil {
1577 return err
1578 }
1579 var target, criteria, limitStr string
1580 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1581 return ircError{&irc.Message{
1582 Command: "FAIL",
1583 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1584 }}
1585 }
1586
1587 if dc.srv.LogPath == "" {
1588 return ircError{&irc.Message{
1589 Command: irc.ERR_UNKNOWNCOMMAND,
1590 Params: []string{dc.nick, subcommand, "Unknown command"},
1591 }}
1592 }
1593
1594 uc, entity, err := dc.unmarshalEntity(target)
1595 if err != nil {
1596 return err
1597 }
1598
1599 // TODO: support msgid criteria
1600 criteriaParts := strings.SplitN(criteria, "=", 2)
1601 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1602 return ircError{&irc.Message{
1603 Command: "FAIL",
1604 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1605 }}
1606 }
1607
1608 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1609 if err != nil {
1610 return ircError{&irc.Message{
1611 Command: "FAIL",
1612 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1613 }}
1614 }
1615
1616 limit, err := strconv.Atoi(limitStr)
1617 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1618 return ircError{&irc.Message{
1619 Command: "FAIL",
1620 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1621 }}
1622 }
1623
1624 var history []*irc.Message
1625 switch subcommand {
1626 case "BEFORE":
1627 history, err = loadHistoryBeforeTime(uc.network, entity, timestamp, limit)
1628 case "AFTER":
1629 history, err = loadHistoryAfterTime(uc.network, entity, timestamp, limit)
1630 default:
1631 // TODO: support LATEST, BETWEEN
1632 return ircError{&irc.Message{
1633 Command: "FAIL",
1634 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1635 }}
1636 }
1637 if err != nil {
1638 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1639 return newChatHistoryError(subcommand, target)
1640 }
1641
1642 batchRef := "history"
1643 dc.SendMessage(&irc.Message{
1644 Prefix: dc.srv.prefix(),
1645 Command: "BATCH",
1646 Params: []string{"+" + batchRef, "chathistory", target},
1647 })
1648
1649 for _, msg := range history {
1650 msg.Tags["batch"] = irc.TagValue(batchRef)
1651 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1652 }
1653
1654 dc.SendMessage(&irc.Message{
1655 Prefix: dc.srv.prefix(),
1656 Command: "BATCH",
1657 Params: []string{"-" + batchRef},
1658 })
1659 default:
1660 dc.logger.Printf("unhandled message: %v", msg)
1661 return newUnknownCommandError(msg.Command)
1662 }
1663 return nil
1664}
1665
1666func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1667 username, password, ok := parseNickServCredentials(text, uc.nick)
1668 if !ok {
1669 return
1670 }
1671
1672 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1673 // automatically erase the key pair or any other credentials.
1674 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1675 return
1676 }
1677
1678 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1679 n := uc.network
1680 n.SASL.Mechanism = "PLAIN"
1681 n.SASL.Plain.Username = username
1682 n.SASL.Plain.Password = password
1683 if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
1684 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1685 }
1686}
1687
1688func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1689 fields := strings.Fields(text)
1690 if len(fields) < 2 {
1691 return "", "", false
1692 }
1693 cmd := strings.ToUpper(fields[0])
1694 params := fields[1:]
1695 switch cmd {
1696 case "REGISTER":
1697 username = nick
1698 password = params[0]
1699 case "IDENTIFY":
1700 if len(params) == 1 {
1701 username = nick
1702 password = params[0]
1703 } else {
1704 username = params[0]
1705 password = params[1]
1706 }
1707 case "SET":
1708 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1709 username = nick
1710 password = params[1]
1711 }
1712 default:
1713 return "", "", false
1714 }
1715 return username, password, true
1716}
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