source: code/trunk/downstream.go@ 352

Last change on this file since 352 was 347, checked in by contact, 5 years ago

Add RemoteAddr to ircConn interface
File size: 40.8 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// permanentDownstreamCaps is the list of always-supported downstream
61// capabilities.
62var permanentDownstreamCaps = map[string]string{
63 "batch": "",
64 "cap-notify": "",
65 "echo-message": "",
66 "message-tags": "",
67 "sasl": "PLAIN",
68 "server-time": "",
69}
70
71// needAllDownstreamCaps is the list of downstream capabilities that
72// require support from all upstreams to be enabled
73var needAllDownstreamCaps = map[string]string{
74 "away-notify": "",
75 "multi-prefix": "",
76}
77
78type downstreamConn struct {
79 conn
80
81 id uint64
82
83 registered bool
84 user *user
85 nick string
86 rawUsername string
87 networkName string
88 clientName string
89 realname string
90 hostname string
91 password string // empty after authentication
92 network *network // can be nil
93
94 negociatingCaps bool
95 capVersion int
96 supportedCaps map[string]string
97 caps map[string]bool
98
99 saslServer sasl.Server
100}
101
102func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
103 remoteAddr := ic.RemoteAddr().String()
104 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
105 dc := &downstreamConn{
106 conn: *newConn(srv, ic, logger),
107 id: id,
108 supportedCaps: make(map[string]string),
109 caps: make(map[string]bool),
110 }
111 dc.hostname = remoteAddr
112 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
113 dc.hostname = host
114 }
115 for k, v := range permanentDownstreamCaps {
116 dc.supportedCaps[k] = v
117 }
118 if srv.LogPath != "" {
119 dc.supportedCaps["draft/chathistory"] = ""
120 }
121 return dc
122}
123
124func (dc *downstreamConn) prefix() *irc.Prefix {
125 return &irc.Prefix{
126 Name: dc.nick,
127 User: dc.user.Username,
128 Host: dc.hostname,
129 }
130}
131
132func (dc *downstreamConn) forEachNetwork(f func(*network)) {
133 if dc.network != nil {
134 f(dc.network)
135 } else {
136 dc.user.forEachNetwork(f)
137 }
138}
139
140func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
141 dc.user.forEachUpstream(func(uc *upstreamConn) {
142 if dc.network != nil && uc.network != dc.network {
143 return
144 }
145 f(uc)
146 })
147}
148
149// upstream returns the upstream connection, if any. If there are zero or if
150// there are multiple upstream connections, it returns nil.
151func (dc *downstreamConn) upstream() *upstreamConn {
152 if dc.network == nil {
153 return nil
154 }
155 return dc.network.conn
156}
157
158func isOurNick(net *network, nick string) bool {
159 // TODO: this doesn't account for nick changes
160 if net.conn != nil {
161 return nick == net.conn.nick
162 }
163 // We're not currently connected to the upstream connection, so we don't
164 // know whether this name is our nickname. Best-effort: use the network's
165 // configured nickname and hope it was the one being used when we were
166 // connected.
167 return nick == net.Nick
168}
169
170// marshalEntity converts an upstream entity name (ie. channel or nick) into a
171// downstream entity name.
172//
173// This involves adding a "/<network>" suffix if the entity isn't the current
174// user.
175func (dc *downstreamConn) marshalEntity(net *network, name string) string {
176 if isOurNick(net, name) {
177 return dc.nick
178 }
179 if dc.network != nil {
180 if dc.network != net {
181 panic("soju: tried to marshal an entity for another network")
182 }
183 return name
184 }
185 return name + "/" + net.GetName()
186}
187
188func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
189 if isOurNick(net, prefix.Name) {
190 return dc.prefix()
191 }
192 if dc.network != nil {
193 if dc.network != net {
194 panic("soju: tried to marshal a user prefix for another network")
195 }
196 return prefix
197 }
198 return &irc.Prefix{
199 Name: prefix.Name + "/" + net.GetName(),
200 User: prefix.User,
201 Host: prefix.Host,
202 }
203}
204
205// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
206// an upstream entity name.
207//
208// This involves removing the "/<network>" suffix.
209func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
210 if uc := dc.upstream(); uc != nil {
211 return uc, name, nil
212 }
213
214 var conn *upstreamConn
215 if i := strings.LastIndexByte(name, '/'); i >= 0 {
216 network := name[i+1:]
217 name = name[:i]
218
219 dc.forEachUpstream(func(uc *upstreamConn) {
220 if network != uc.network.GetName() {
221 return
222 }
223 conn = uc
224 })
225 }
226
227 if conn == nil {
228 return nil, "", ircError{&irc.Message{
229 Command: irc.ERR_NOSUCHCHANNEL,
230 Params: []string{name, "No such channel"},
231 }}
232 }
233 return conn, name, nil
234}
235
236func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
237 if dc.upstream() != nil {
238 return text
239 }
240 // TODO: smarter parsing that ignores URLs
241 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
242}
243
244func (dc *downstreamConn) readMessages(ch chan<- event) error {
245 for {
246 msg, err := dc.ReadMessage()
247 if err == io.EOF {
248 break
249 } else if err != nil {
250 return fmt.Errorf("failed to read IRC command: %v", err)
251 }
252
253 ch <- eventDownstreamMessage{msg, dc}
254 }
255
256 return nil
257}
258
259// SendMessage sends an outgoing message.
260//
261// This can only called from the user goroutine.
262func (dc *downstreamConn) SendMessage(msg *irc.Message) {
263 if !dc.caps["message-tags"] {
264 if msg.Command == "TAGMSG" {
265 return
266 }
267 msg = msg.Copy()
268 for name := range msg.Tags {
269 supported := false
270 switch name {
271 case "time":
272 supported = dc.caps["server-time"]
273 }
274 if !supported {
275 delete(msg.Tags, name)
276 }
277 }
278 }
279
280 dc.conn.SendMessage(msg)
281}
282
283// marshalMessage re-formats a message coming from an upstream connection so
284// that it's suitable for being sent on this downstream connection. Only
285// messages that may appear in logs are supported, except MODE.
286func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
287 msg = msg.Copy()
288 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
289
290 switch msg.Command {
291 case "PRIVMSG", "NOTICE", "TAGMSG":
292 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
293 case "NICK":
294 // Nick change for another user
295 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
296 case "JOIN", "PART":
297 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
298 case "KICK":
299 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
300 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
301 case "TOPIC":
302 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
303 case "QUIT":
304 // This space is intentionally left blank
305 default:
306 panic(fmt.Sprintf("unexpected %q message", msg.Command))
307 }
308
309 return msg
310}
311
312func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
313 switch msg.Command {
314 case "QUIT":
315 return dc.Close()
316 default:
317 if dc.registered {
318 return dc.handleMessageRegistered(msg)
319 } else {
320 return dc.handleMessageUnregistered(msg)
321 }
322 }
323}
324
325func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
326 switch msg.Command {
327 case "NICK":
328 var nick string
329 if err := parseMessageParams(msg, &nick); err != nil {
330 return err
331 }
332 if nick == serviceNick {
333 return ircError{&irc.Message{
334 Command: irc.ERR_NICKNAMEINUSE,
335 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
336 }}
337 }
338 dc.nick = nick
339 case "USER":
340 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
341 return err
342 }
343 case "PASS":
344 if err := parseMessageParams(msg, &dc.password); err != nil {
345 return err
346 }
347 case "CAP":
348 var subCmd string
349 if err := parseMessageParams(msg, &subCmd); err != nil {
350 return err
351 }
352 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
353 return err
354 }
355 case "AUTHENTICATE":
356 if !dc.caps["sasl"] {
357 return ircError{&irc.Message{
358 Command: irc.ERR_SASLFAIL,
359 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
360 }}
361 }
362 if len(msg.Params) == 0 {
363 return ircError{&irc.Message{
364 Command: irc.ERR_SASLFAIL,
365 Params: []string{"*", "Missing AUTHENTICATE argument"},
366 }}
367 }
368 if dc.nick == "" {
369 return ircError{&irc.Message{
370 Command: irc.ERR_SASLFAIL,
371 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
372 }}
373 }
374
375 var resp []byte
376 if dc.saslServer == nil {
377 mech := strings.ToUpper(msg.Params[0])
378 switch mech {
379 case "PLAIN":
380 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
381 return dc.authenticate(username, password)
382 }))
383 default:
384 return ircError{&irc.Message{
385 Command: irc.ERR_SASLFAIL,
386 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
387 }}
388 }
389 } else if msg.Params[0] == "*" {
390 dc.saslServer = nil
391 return ircError{&irc.Message{
392 Command: irc.ERR_SASLABORTED,
393 Params: []string{"*", "SASL authentication aborted"},
394 }}
395 } else if msg.Params[0] == "+" {
396 resp = nil
397 } else {
398 // TODO: multi-line messages
399 var err error
400 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
401 if err != nil {
402 dc.saslServer = nil
403 return ircError{&irc.Message{
404 Command: irc.ERR_SASLFAIL,
405 Params: []string{"*", "Invalid base64-encoded response"},
406 }}
407 }
408 }
409
410 challenge, done, err := dc.saslServer.Next(resp)
411 if err != nil {
412 dc.saslServer = nil
413 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
414 return ircError{&irc.Message{
415 Command: irc.ERR_SASLFAIL,
416 Params: []string{"*", ircErr.Message.Params[1]},
417 }}
418 }
419 dc.SendMessage(&irc.Message{
420 Prefix: dc.srv.prefix(),
421 Command: irc.ERR_SASLFAIL,
422 Params: []string{"*", "SASL error"},
423 })
424 return fmt.Errorf("SASL authentication failed: %v", err)
425 } else if done {
426 dc.saslServer = nil
427 dc.SendMessage(&irc.Message{
428 Prefix: dc.srv.prefix(),
429 Command: irc.RPL_LOGGEDIN,
430 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
431 })
432 dc.SendMessage(&irc.Message{
433 Prefix: dc.srv.prefix(),
434 Command: irc.RPL_SASLSUCCESS,
435 Params: []string{dc.nick, "SASL authentication successful"},
436 })
437 } else {
438 challengeStr := "+"
439 if len(challenge) > 0 {
440 challengeStr = base64.StdEncoding.EncodeToString(challenge)
441 }
442
443 // TODO: multi-line messages
444 dc.SendMessage(&irc.Message{
445 Prefix: dc.srv.prefix(),
446 Command: "AUTHENTICATE",
447 Params: []string{challengeStr},
448 })
449 }
450 default:
451 dc.logger.Printf("unhandled message: %v", msg)
452 return newUnknownCommandError(msg.Command)
453 }
454 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
455 return dc.register()
456 }
457 return nil
458}
459
460func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
461 cmd = strings.ToUpper(cmd)
462
463 replyTo := dc.nick
464 if !dc.registered {
465 replyTo = "*"
466 }
467
468 switch cmd {
469 case "LS":
470 if len(args) > 0 {
471 var err error
472 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
473 return err
474 }
475 }
476
477 caps := make([]string, 0, len(dc.supportedCaps))
478 for k, v := range dc.supportedCaps {
479 if dc.capVersion >= 302 && v != "" {
480 caps = append(caps, k+"="+v)
481 } else {
482 caps = append(caps, k)
483 }
484 }
485
486 // TODO: multi-line replies
487 dc.SendMessage(&irc.Message{
488 Prefix: dc.srv.prefix(),
489 Command: "CAP",
490 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
491 })
492
493 if dc.capVersion >= 302 {
494 // CAP version 302 implicitly enables cap-notify
495 dc.caps["cap-notify"] = true
496 }
497
498 if !dc.registered {
499 dc.negociatingCaps = true
500 }
501 case "LIST":
502 var caps []string
503 for name := range dc.caps {
504 caps = append(caps, name)
505 }
506
507 // TODO: multi-line replies
508 dc.SendMessage(&irc.Message{
509 Prefix: dc.srv.prefix(),
510 Command: "CAP",
511 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
512 })
513 case "REQ":
514 if len(args) == 0 {
515 return ircError{&irc.Message{
516 Command: err_invalidcapcmd,
517 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
518 }}
519 }
520
521 // TODO: atomically ack/nak the whole capability set
522 caps := strings.Fields(args[0])
523 ack := true
524 for _, name := range caps {
525 name = strings.ToLower(name)
526 enable := !strings.HasPrefix(name, "-")
527 if !enable {
528 name = strings.TrimPrefix(name, "-")
529 }
530
531 if enable == dc.caps[name] {
532 continue
533 }
534
535 _, ok := dc.supportedCaps[name]
536 if !ok {
537 ack = false
538 break
539 }
540
541 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
542 // cap-notify cannot be disabled with CAP version 302
543 ack = false
544 break
545 }
546
547 dc.caps[name] = enable
548 }
549
550 reply := "NAK"
551 if ack {
552 reply = "ACK"
553 }
554 dc.SendMessage(&irc.Message{
555 Prefix: dc.srv.prefix(),
556 Command: "CAP",
557 Params: []string{replyTo, reply, args[0]},
558 })
559 case "END":
560 dc.negociatingCaps = false
561 default:
562 return ircError{&irc.Message{
563 Command: err_invalidcapcmd,
564 Params: []string{replyTo, cmd, "Unknown CAP command"},
565 }}
566 }
567 return nil
568}
569
570func (dc *downstreamConn) setSupportedCap(name, value string) {
571 prevValue, hasPrev := dc.supportedCaps[name]
572 changed := !hasPrev || prevValue != value
573 dc.supportedCaps[name] = value
574
575 if !dc.caps["cap-notify"] || !changed {
576 return
577 }
578
579 replyTo := dc.nick
580 if !dc.registered {
581 replyTo = "*"
582 }
583
584 cap := name
585 if value != "" && dc.capVersion >= 302 {
586 cap = name + "=" + value
587 }
588
589 dc.SendMessage(&irc.Message{
590 Prefix: dc.srv.prefix(),
591 Command: "CAP",
592 Params: []string{replyTo, "NEW", cap},
593 })
594}
595
596func (dc *downstreamConn) unsetSupportedCap(name string) {
597 _, hasPrev := dc.supportedCaps[name]
598 delete(dc.supportedCaps, name)
599 delete(dc.caps, name)
600
601 if !dc.caps["cap-notify"] || !hasPrev {
602 return
603 }
604
605 replyTo := dc.nick
606 if !dc.registered {
607 replyTo = "*"
608 }
609
610 dc.SendMessage(&irc.Message{
611 Prefix: dc.srv.prefix(),
612 Command: "CAP",
613 Params: []string{replyTo, "DEL", name},
614 })
615}
616
617func (dc *downstreamConn) updateSupportedCaps() {
618 supportedCaps := make(map[string]bool)
619 for cap := range needAllDownstreamCaps {
620 supportedCaps[cap] = true
621 }
622 dc.forEachUpstream(func(uc *upstreamConn) {
623 for cap, supported := range supportedCaps {
624 supportedCaps[cap] = supported && uc.caps[cap]
625 }
626 })
627
628 for cap, supported := range supportedCaps {
629 if supported {
630 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
631 } else {
632 dc.unsetSupportedCap(cap)
633 }
634 }
635}
636
637func (dc *downstreamConn) updateNick() {
638 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
639 dc.SendMessage(&irc.Message{
640 Prefix: dc.prefix(),
641 Command: "NICK",
642 Params: []string{uc.nick},
643 })
644 dc.nick = uc.nick
645 }
646}
647
648func sanityCheckServer(addr string) error {
649 dialer := net.Dialer{Timeout: 30 * time.Second}
650 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
651 if err != nil {
652 return err
653 }
654 return conn.Close()
655}
656
657func unmarshalUsername(rawUsername string) (username, client, network string) {
658 username = rawUsername
659
660 i := strings.IndexAny(username, "/@")
661 j := strings.LastIndexAny(username, "/@")
662 if i >= 0 {
663 username = rawUsername[:i]
664 }
665 if j >= 0 {
666 if rawUsername[j] == '@' {
667 client = rawUsername[j+1:]
668 } else {
669 network = rawUsername[j+1:]
670 }
671 }
672 if i >= 0 && j >= 0 && i < j {
673 if rawUsername[i] == '@' {
674 client = rawUsername[i+1 : j]
675 } else {
676 network = rawUsername[i+1 : j]
677 }
678 }
679
680 return username, client, network
681}
682
683func (dc *downstreamConn) authenticate(username, password string) error {
684 username, clientName, networkName := unmarshalUsername(username)
685
686 u, err := dc.srv.db.GetUser(username)
687 if err != nil {
688 dc.logger.Printf("failed authentication for %q: %v", username, err)
689 return errAuthFailed
690 }
691
692 // Password auth disabled
693 if u.Password == "" {
694 return errAuthFailed
695 }
696
697 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
698 if err != nil {
699 dc.logger.Printf("failed authentication for %q: %v", username, err)
700 return errAuthFailed
701 }
702
703 dc.user = dc.srv.getUser(username)
704 if dc.user == nil {
705 dc.logger.Printf("failed authentication for %q: user not active", username)
706 return errAuthFailed
707 }
708 dc.clientName = clientName
709 dc.networkName = networkName
710 return nil
711}
712
713func (dc *downstreamConn) register() error {
714 if dc.registered {
715 return fmt.Errorf("tried to register twice")
716 }
717
718 password := dc.password
719 dc.password = ""
720 if dc.user == nil {
721 if err := dc.authenticate(dc.rawUsername, password); err != nil {
722 return err
723 }
724 }
725
726 if dc.clientName == "" && dc.networkName == "" {
727 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
728 }
729
730 dc.registered = true
731 dc.logger.Printf("registration complete for user %q", dc.user.Username)
732 return nil
733}
734
735func (dc *downstreamConn) loadNetwork() error {
736 if dc.networkName == "" {
737 return nil
738 }
739
740 network := dc.user.getNetwork(dc.networkName)
741 if network == nil {
742 addr := dc.networkName
743 if !strings.ContainsRune(addr, ':') {
744 addr = addr + ":6697"
745 }
746
747 dc.logger.Printf("trying to connect to new network %q", addr)
748 if err := sanityCheckServer(addr); err != nil {
749 dc.logger.Printf("failed to connect to %q: %v", addr, err)
750 return ircError{&irc.Message{
751 Command: irc.ERR_PASSWDMISMATCH,
752 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
753 }}
754 }
755
756 dc.logger.Printf("auto-saving network %q", dc.networkName)
757 var err error
758 network, err = dc.user.createNetwork(&Network{
759 Addr: dc.networkName,
760 Nick: dc.nick,
761 })
762 if err != nil {
763 return err
764 }
765 }
766
767 dc.network = network
768 return nil
769}
770
771func (dc *downstreamConn) welcome() error {
772 if dc.user == nil || !dc.registered {
773 panic("tried to welcome an unregistered connection")
774 }
775
776 // TODO: doing this might take some time. We should do it in dc.register
777 // instead, but we'll potentially be adding a new network and this must be
778 // done in the user goroutine.
779 if err := dc.loadNetwork(); err != nil {
780 return err
781 }
782
783 dc.SendMessage(&irc.Message{
784 Prefix: dc.srv.prefix(),
785 Command: irc.RPL_WELCOME,
786 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
787 })
788 dc.SendMessage(&irc.Message{
789 Prefix: dc.srv.prefix(),
790 Command: irc.RPL_YOURHOST,
791 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
792 })
793 dc.SendMessage(&irc.Message{
794 Prefix: dc.srv.prefix(),
795 Command: irc.RPL_CREATED,
796 Params: []string{dc.nick, "Who cares when the server was created?"},
797 })
798 dc.SendMessage(&irc.Message{
799 Prefix: dc.srv.prefix(),
800 Command: irc.RPL_MYINFO,
801 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
802 })
803 // TODO: RPL_ISUPPORT
804 // TODO: send CHATHISTORY in RPL_ISUPPORT when implemented
805 dc.SendMessage(&irc.Message{
806 Prefix: dc.srv.prefix(),
807 Command: irc.ERR_NOMOTD,
808 Params: []string{dc.nick, "No MOTD"},
809 })
810
811 dc.updateNick()
812
813 dc.forEachUpstream(func(uc *upstreamConn) {
814 for _, ch := range uc.channels {
815 if !ch.complete {
816 continue
817 }
818 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
819 continue
820 }
821
822 dc.SendMessage(&irc.Message{
823 Prefix: dc.prefix(),
824 Command: "JOIN",
825 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
826 })
827
828 forwardChannel(dc, ch)
829 }
830 })
831
832 dc.forEachNetwork(func(net *network) {
833 // Only send history if we're the first connected client with that name
834 // for the network
835 if _, ok := net.offlineClients[dc.clientName]; ok {
836 dc.sendNetworkHistory(net)
837 delete(net.offlineClients, dc.clientName)
838 }
839 })
840
841 return nil
842}
843
844func (dc *downstreamConn) sendNetworkHistory(net *network) {
845 if dc.caps["draft/chathistory"] {
846 return
847 }
848 for target, history := range net.history {
849 if ch, ok := net.channels[target]; ok && ch.Detached {
850 continue
851 }
852
853 seq, ok := history.offlineClients[dc.clientName]
854 if !ok {
855 continue
856 }
857 delete(history.offlineClients, dc.clientName)
858
859 // If all clients have received history, no need to keep the
860 // ring buffer around
861 if len(history.offlineClients) == 0 {
862 delete(net.history, target)
863 }
864
865 consumer := history.ring.NewConsumer(seq)
866
867 batchRef := "history"
868 if dc.caps["batch"] {
869 dc.SendMessage(&irc.Message{
870 Prefix: dc.srv.prefix(),
871 Command: "BATCH",
872 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
873 })
874 }
875
876 for {
877 msg := consumer.Consume()
878 if msg == nil {
879 break
880 }
881
882 // Don't replay all messages, because that would mess up client
883 // state. For instance we just sent the list of users, sending
884 // PART messages for one of these users would be incorrect.
885 ignore := true
886 switch msg.Command {
887 case "PRIVMSG", "NOTICE":
888 ignore = false
889 }
890 if ignore {
891 continue
892 }
893
894 if dc.caps["batch"] {
895 msg = msg.Copy()
896 msg.Tags["batch"] = irc.TagValue(batchRef)
897 }
898
899 dc.SendMessage(dc.marshalMessage(msg, net))
900 }
901
902 if dc.caps["batch"] {
903 dc.SendMessage(&irc.Message{
904 Prefix: dc.srv.prefix(),
905 Command: "BATCH",
906 Params: []string{"-" + batchRef},
907 })
908 }
909 }
910}
911
912func (dc *downstreamConn) runUntilRegistered() error {
913 for !dc.registered {
914 msg, err := dc.ReadMessage()
915 if err != nil {
916 return fmt.Errorf("failed to read IRC command: %v", err)
917 }
918
919 err = dc.handleMessage(msg)
920 if ircErr, ok := err.(ircError); ok {
921 ircErr.Message.Prefix = dc.srv.prefix()
922 dc.SendMessage(ircErr.Message)
923 } else if err != nil {
924 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
925 }
926 }
927
928 return nil
929}
930
931func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
932 switch msg.Command {
933 case "CAP":
934 var subCmd string
935 if err := parseMessageParams(msg, &subCmd); err != nil {
936 return err
937 }
938 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
939 return err
940 }
941 case "PING":
942 dc.SendMessage(&irc.Message{
943 Prefix: dc.srv.prefix(),
944 Command: "PONG",
945 Params: msg.Params,
946 })
947 return nil
948 case "USER":
949 return ircError{&irc.Message{
950 Command: irc.ERR_ALREADYREGISTERED,
951 Params: []string{dc.nick, "You may not reregister"},
952 }}
953 case "NICK":
954 var nick string
955 if err := parseMessageParams(msg, &nick); err != nil {
956 return err
957 }
958
959 var upstream *upstreamConn
960 if dc.upstream() == nil {
961 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
962 if err == nil { // NICK nick/network: NICK only on a specific upstream
963 upstream = uc
964 nick = unmarshaledNick
965 }
966 }
967
968 var err error
969 dc.forEachNetwork(func(n *network) {
970 if err != nil || (upstream != nil && upstream.network != n) {
971 return
972 }
973 n.Nick = nick
974 err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
975 })
976 if err != nil {
977 return err
978 }
979
980 dc.forEachUpstream(func(uc *upstreamConn) {
981 if upstream != nil && upstream != uc {
982 return
983 }
984 uc.SendMessageLabeled(dc.id, &irc.Message{
985 Command: "NICK",
986 Params: []string{nick},
987 })
988 })
989
990 if dc.upstream() == nil && dc.nick != nick {
991 dc.SendMessage(&irc.Message{
992 Prefix: dc.prefix(),
993 Command: "NICK",
994 Params: []string{nick},
995 })
996 dc.nick = nick
997 }
998 case "JOIN":
999 var namesStr string
1000 if err := parseMessageParams(msg, &namesStr); err != nil {
1001 return err
1002 }
1003
1004 var keys []string
1005 if len(msg.Params) > 1 {
1006 keys = strings.Split(msg.Params[1], ",")
1007 }
1008
1009 for i, name := range strings.Split(namesStr, ",") {
1010 uc, upstreamName, err := dc.unmarshalEntity(name)
1011 if err != nil {
1012 return err
1013 }
1014
1015 var key string
1016 if len(keys) > i {
1017 key = keys[i]
1018 }
1019
1020 params := []string{upstreamName}
1021 if key != "" {
1022 params = append(params, key)
1023 }
1024 uc.SendMessageLabeled(dc.id, &irc.Message{
1025 Command: "JOIN",
1026 Params: params,
1027 })
1028
1029 ch := &Channel{Name: upstreamName, Key: key, Detached: false}
1030 if current, ok := uc.network.channels[ch.Name]; ok && key == "" {
1031 // Don't clear the channel key if there's one set
1032 // TODO: add a way to unset the channel key
1033 ch.Key = current.Key
1034 }
1035 if err := uc.network.createUpdateChannel(ch); err != nil {
1036 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1037 }
1038 }
1039 case "PART":
1040 var namesStr string
1041 if err := parseMessageParams(msg, &namesStr); err != nil {
1042 return err
1043 }
1044
1045 var reason string
1046 if len(msg.Params) > 1 {
1047 reason = msg.Params[1]
1048 }
1049
1050 for _, name := range strings.Split(namesStr, ",") {
1051 uc, upstreamName, err := dc.unmarshalEntity(name)
1052 if err != nil {
1053 return err
1054 }
1055
1056 if strings.EqualFold(reason, "detach") {
1057 ch := &Channel{Name: upstreamName, Detached: true}
1058 if err := uc.network.createUpdateChannel(ch); err != nil {
1059 dc.logger.Printf("failed to detach channel %q: %v", upstreamName, err)
1060 }
1061 } else {
1062 params := []string{upstreamName}
1063 if reason != "" {
1064 params = append(params, reason)
1065 }
1066 uc.SendMessageLabeled(dc.id, &irc.Message{
1067 Command: "PART",
1068 Params: params,
1069 })
1070
1071 if err := uc.network.deleteChannel(upstreamName); err != nil {
1072 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1073 }
1074 }
1075 }
1076 case "KICK":
1077 var channelStr, userStr string
1078 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1079 return err
1080 }
1081
1082 channels := strings.Split(channelStr, ",")
1083 users := strings.Split(userStr, ",")
1084
1085 var reason string
1086 if len(msg.Params) > 2 {
1087 reason = msg.Params[2]
1088 }
1089
1090 if len(channels) != 1 && len(channels) != len(users) {
1091 return ircError{&irc.Message{
1092 Command: irc.ERR_BADCHANMASK,
1093 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1094 }}
1095 }
1096
1097 for i, user := range users {
1098 var channel string
1099 if len(channels) == 1 {
1100 channel = channels[0]
1101 } else {
1102 channel = channels[i]
1103 }
1104
1105 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1106 if err != nil {
1107 return err
1108 }
1109
1110 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1111 if err != nil {
1112 return err
1113 }
1114
1115 if ucChannel != ucUser {
1116 return ircError{&irc.Message{
1117 Command: irc.ERR_USERNOTINCHANNEL,
1118 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
1119 }}
1120 }
1121 uc := ucChannel
1122
1123 params := []string{upstreamChannel, upstreamUser}
1124 if reason != "" {
1125 params = append(params, reason)
1126 }
1127 uc.SendMessageLabeled(dc.id, &irc.Message{
1128 Command: "KICK",
1129 Params: params,
1130 })
1131 }
1132 case "MODE":
1133 var name string
1134 if err := parseMessageParams(msg, &name); err != nil {
1135 return err
1136 }
1137
1138 var modeStr string
1139 if len(msg.Params) > 1 {
1140 modeStr = msg.Params[1]
1141 }
1142
1143 if name == dc.nick {
1144 if modeStr != "" {
1145 dc.forEachUpstream(func(uc *upstreamConn) {
1146 uc.SendMessageLabeled(dc.id, &irc.Message{
1147 Command: "MODE",
1148 Params: []string{uc.nick, modeStr},
1149 })
1150 })
1151 } else {
1152 dc.SendMessage(&irc.Message{
1153 Prefix: dc.srv.prefix(),
1154 Command: irc.RPL_UMODEIS,
1155 Params: []string{dc.nick, ""}, // TODO
1156 })
1157 }
1158 return nil
1159 }
1160
1161 uc, upstreamName, err := dc.unmarshalEntity(name)
1162 if err != nil {
1163 return err
1164 }
1165
1166 if !uc.isChannel(upstreamName) {
1167 return ircError{&irc.Message{
1168 Command: irc.ERR_USERSDONTMATCH,
1169 Params: []string{dc.nick, "Cannot change mode for other users"},
1170 }}
1171 }
1172
1173 if modeStr != "" {
1174 params := []string{upstreamName, modeStr}
1175 params = append(params, msg.Params[2:]...)
1176 uc.SendMessageLabeled(dc.id, &irc.Message{
1177 Command: "MODE",
1178 Params: params,
1179 })
1180 } else {
1181 ch, ok := uc.channels[upstreamName]
1182 if !ok {
1183 return ircError{&irc.Message{
1184 Command: irc.ERR_NOSUCHCHANNEL,
1185 Params: []string{dc.nick, name, "No such channel"},
1186 }}
1187 }
1188
1189 if ch.modes == nil {
1190 // we haven't received the initial RPL_CHANNELMODEIS yet
1191 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1192 return nil
1193 }
1194
1195 modeStr, modeParams := ch.modes.Format()
1196 params := []string{dc.nick, name, modeStr}
1197 params = append(params, modeParams...)
1198
1199 dc.SendMessage(&irc.Message{
1200 Prefix: dc.srv.prefix(),
1201 Command: irc.RPL_CHANNELMODEIS,
1202 Params: params,
1203 })
1204 if ch.creationTime != "" {
1205 dc.SendMessage(&irc.Message{
1206 Prefix: dc.srv.prefix(),
1207 Command: rpl_creationtime,
1208 Params: []string{dc.nick, name, ch.creationTime},
1209 })
1210 }
1211 }
1212 case "TOPIC":
1213 var channel string
1214 if err := parseMessageParams(msg, &channel); err != nil {
1215 return err
1216 }
1217
1218 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1219 if err != nil {
1220 return err
1221 }
1222
1223 if len(msg.Params) > 1 { // setting topic
1224 topic := msg.Params[1]
1225 uc.SendMessageLabeled(dc.id, &irc.Message{
1226 Command: "TOPIC",
1227 Params: []string{upstreamChannel, topic},
1228 })
1229 } else { // getting topic
1230 ch, ok := uc.channels[upstreamChannel]
1231 if !ok {
1232 return ircError{&irc.Message{
1233 Command: irc.ERR_NOSUCHCHANNEL,
1234 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1235 }}
1236 }
1237 sendTopic(dc, ch)
1238 }
1239 case "LIST":
1240 // TODO: support ELIST when supported by all upstreams
1241
1242 pl := pendingLIST{
1243 downstreamID: dc.id,
1244 pendingCommands: make(map[int64]*irc.Message),
1245 }
1246 var upstream *upstreamConn
1247 var upstreamChannels map[int64][]string
1248 if len(msg.Params) > 0 {
1249 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1250 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1251 upstream = uc
1252 } else {
1253 upstreamChannels = make(map[int64][]string)
1254 channels := strings.Split(msg.Params[0], ",")
1255 for _, channel := range channels {
1256 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1257 if err != nil {
1258 return err
1259 }
1260 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1261 }
1262 }
1263 }
1264
1265 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1266 dc.forEachUpstream(func(uc *upstreamConn) {
1267 if upstream != nil && upstream != uc {
1268 return
1269 }
1270 var params []string
1271 if upstreamChannels != nil {
1272 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1273 params = []string{strings.Join(channels, ",")}
1274 } else {
1275 return
1276 }
1277 }
1278 pl.pendingCommands[uc.network.ID] = &irc.Message{
1279 Command: "LIST",
1280 Params: params,
1281 }
1282 uc.trySendLIST(dc.id)
1283 })
1284 case "NAMES":
1285 if len(msg.Params) == 0 {
1286 dc.SendMessage(&irc.Message{
1287 Prefix: dc.srv.prefix(),
1288 Command: irc.RPL_ENDOFNAMES,
1289 Params: []string{dc.nick, "*", "End of /NAMES list"},
1290 })
1291 return nil
1292 }
1293
1294 channels := strings.Split(msg.Params[0], ",")
1295 for _, channel := range channels {
1296 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1297 if err != nil {
1298 return err
1299 }
1300
1301 ch, ok := uc.channels[upstreamChannel]
1302 if ok {
1303 sendNames(dc, ch)
1304 } else {
1305 // NAMES on a channel we have not joined, ask upstream
1306 uc.SendMessageLabeled(dc.id, &irc.Message{
1307 Command: "NAMES",
1308 Params: []string{upstreamChannel},
1309 })
1310 }
1311 }
1312 case "WHO":
1313 if len(msg.Params) == 0 {
1314 // TODO: support WHO without parameters
1315 dc.SendMessage(&irc.Message{
1316 Prefix: dc.srv.prefix(),
1317 Command: irc.RPL_ENDOFWHO,
1318 Params: []string{dc.nick, "*", "End of /WHO list"},
1319 })
1320 return nil
1321 }
1322
1323 // TODO: support WHO masks
1324 entity := msg.Params[0]
1325
1326 if entity == dc.nick {
1327 // TODO: support AWAY (H/G) in self WHO reply
1328 dc.SendMessage(&irc.Message{
1329 Prefix: dc.srv.prefix(),
1330 Command: irc.RPL_WHOREPLY,
1331 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1332 })
1333 dc.SendMessage(&irc.Message{
1334 Prefix: dc.srv.prefix(),
1335 Command: irc.RPL_ENDOFWHO,
1336 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1337 })
1338 return nil
1339 }
1340 if entity == serviceNick {
1341 dc.SendMessage(&irc.Message{
1342 Prefix: dc.srv.prefix(),
1343 Command: irc.RPL_WHOREPLY,
1344 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1345 })
1346 dc.SendMessage(&irc.Message{
1347 Prefix: dc.srv.prefix(),
1348 Command: irc.RPL_ENDOFWHO,
1349 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1350 })
1351 return nil
1352 }
1353
1354 uc, upstreamName, err := dc.unmarshalEntity(entity)
1355 if err != nil {
1356 return err
1357 }
1358
1359 var params []string
1360 if len(msg.Params) == 2 {
1361 params = []string{upstreamName, msg.Params[1]}
1362 } else {
1363 params = []string{upstreamName}
1364 }
1365
1366 uc.SendMessageLabeled(dc.id, &irc.Message{
1367 Command: "WHO",
1368 Params: params,
1369 })
1370 case "WHOIS":
1371 if len(msg.Params) == 0 {
1372 return ircError{&irc.Message{
1373 Command: irc.ERR_NONICKNAMEGIVEN,
1374 Params: []string{dc.nick, "No nickname given"},
1375 }}
1376 }
1377
1378 var target, mask string
1379 if len(msg.Params) == 1 {
1380 target = ""
1381 mask = msg.Params[0]
1382 } else {
1383 target = msg.Params[0]
1384 mask = msg.Params[1]
1385 }
1386 // TODO: support multiple WHOIS users
1387 if i := strings.IndexByte(mask, ','); i >= 0 {
1388 mask = mask[:i]
1389 }
1390
1391 if mask == dc.nick {
1392 dc.SendMessage(&irc.Message{
1393 Prefix: dc.srv.prefix(),
1394 Command: irc.RPL_WHOISUSER,
1395 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1396 })
1397 dc.SendMessage(&irc.Message{
1398 Prefix: dc.srv.prefix(),
1399 Command: irc.RPL_WHOISSERVER,
1400 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1401 })
1402 dc.SendMessage(&irc.Message{
1403 Prefix: dc.srv.prefix(),
1404 Command: irc.RPL_ENDOFWHOIS,
1405 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1406 })
1407 return nil
1408 }
1409
1410 // TODO: support WHOIS masks
1411 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1412 if err != nil {
1413 return err
1414 }
1415
1416 var params []string
1417 if target != "" {
1418 if target == mask { // WHOIS nick nick
1419 params = []string{upstreamNick, upstreamNick}
1420 } else {
1421 params = []string{target, upstreamNick}
1422 }
1423 } else {
1424 params = []string{upstreamNick}
1425 }
1426
1427 uc.SendMessageLabeled(dc.id, &irc.Message{
1428 Command: "WHOIS",
1429 Params: params,
1430 })
1431 case "PRIVMSG":
1432 var targetsStr, text string
1433 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1434 return err
1435 }
1436 tags := copyClientTags(msg.Tags)
1437
1438 for _, name := range strings.Split(targetsStr, ",") {
1439 if name == serviceNick {
1440 handleServicePRIVMSG(dc, text)
1441 continue
1442 }
1443
1444 uc, upstreamName, err := dc.unmarshalEntity(name)
1445 if err != nil {
1446 return err
1447 }
1448
1449 if upstreamName == "NickServ" {
1450 dc.handleNickServPRIVMSG(uc, text)
1451 }
1452
1453 unmarshaledText := text
1454 if uc.isChannel(upstreamName) {
1455 unmarshaledText = dc.unmarshalText(uc, text)
1456 }
1457 uc.SendMessageLabeled(dc.id, &irc.Message{
1458 Tags: tags,
1459 Command: "PRIVMSG",
1460 Params: []string{upstreamName, unmarshaledText},
1461 })
1462
1463 echoTags := tags.Copy()
1464 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1465 echoMsg := &irc.Message{
1466 Tags: echoTags,
1467 Prefix: &irc.Prefix{
1468 Name: uc.nick,
1469 User: uc.username,
1470 },
1471 Command: "PRIVMSG",
1472 Params: []string{upstreamName, text},
1473 }
1474 uc.produce(upstreamName, echoMsg, dc)
1475 }
1476 case "NOTICE":
1477 var targetsStr, text string
1478 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1479 return err
1480 }
1481 tags := copyClientTags(msg.Tags)
1482
1483 for _, name := range strings.Split(targetsStr, ",") {
1484 uc, upstreamName, err := dc.unmarshalEntity(name)
1485 if err != nil {
1486 return err
1487 }
1488
1489 unmarshaledText := text
1490 if uc.isChannel(upstreamName) {
1491 unmarshaledText = dc.unmarshalText(uc, text)
1492 }
1493 uc.SendMessageLabeled(dc.id, &irc.Message{
1494 Tags: tags,
1495 Command: "NOTICE",
1496 Params: []string{upstreamName, unmarshaledText},
1497 })
1498 }
1499 case "TAGMSG":
1500 var targetsStr string
1501 if err := parseMessageParams(msg, &targetsStr); err != nil {
1502 return err
1503 }
1504 tags := copyClientTags(msg.Tags)
1505
1506 for _, name := range strings.Split(targetsStr, ",") {
1507 uc, upstreamName, err := dc.unmarshalEntity(name)
1508 if err != nil {
1509 return err
1510 }
1511
1512 uc.SendMessageLabeled(dc.id, &irc.Message{
1513 Tags: tags,
1514 Command: "TAGMSG",
1515 Params: []string{upstreamName},
1516 })
1517 }
1518 case "INVITE":
1519 var user, channel string
1520 if err := parseMessageParams(msg, &user, &channel); err != nil {
1521 return err
1522 }
1523
1524 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1525 if err != nil {
1526 return err
1527 }
1528
1529 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1530 if err != nil {
1531 return err
1532 }
1533
1534 if ucChannel != ucUser {
1535 return ircError{&irc.Message{
1536 Command: irc.ERR_USERNOTINCHANNEL,
1537 Params: []string{dc.nick, user, channel, "They aren't on that channel"},
1538 }}
1539 }
1540 uc := ucChannel
1541
1542 uc.SendMessageLabeled(dc.id, &irc.Message{
1543 Command: "INVITE",
1544 Params: []string{upstreamUser, upstreamChannel},
1545 })
1546 case "CHATHISTORY":
1547 var subcommand string
1548 if err := parseMessageParams(msg, &subcommand); err != nil {
1549 return err
1550 }
1551 var target, criteria, limitStr string
1552 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1553 return ircError{&irc.Message{
1554 Command: "FAIL",
1555 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1556 }}
1557 }
1558
1559 if dc.srv.LogPath == "" {
1560 return ircError{&irc.Message{
1561 Command: irc.ERR_UNKNOWNCOMMAND,
1562 Params: []string{dc.nick, subcommand, "Unknown command"},
1563 }}
1564 }
1565
1566 uc, entity, err := dc.unmarshalEntity(target)
1567 if err != nil {
1568 return err
1569 }
1570
1571 // TODO: support msgid criteria
1572 criteriaParts := strings.SplitN(criteria, "=", 2)
1573 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1574 return ircError{&irc.Message{
1575 Command: "FAIL",
1576 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1577 }}
1578 }
1579
1580 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1581 if err != nil {
1582 return ircError{&irc.Message{
1583 Command: "FAIL",
1584 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1585 }}
1586 }
1587
1588 limit, err := strconv.Atoi(limitStr)
1589 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1590 return ircError{&irc.Message{
1591 Command: "FAIL",
1592 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1593 }}
1594 }
1595
1596 switch subcommand {
1597 case "BEFORE":
1598 batchRef := "history"
1599 dc.SendMessage(&irc.Message{
1600 Prefix: dc.srv.prefix(),
1601 Command: "BATCH",
1602 Params: []string{"+" + batchRef, "chathistory", target},
1603 })
1604
1605 history := make([]*irc.Message, limit)
1606 remaining := limit
1607
1608 tries := 0
1609 for remaining > 0 {
1610 buf, err := parseMessagesBefore(uc.network, entity, timestamp, remaining)
1611 if err != nil {
1612 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1613 return newChatHistoryError(subcommand, target)
1614 }
1615 if len(buf) == 0 {
1616 tries++
1617 if tries >= 100 {
1618 break
1619 }
1620 } else {
1621 tries = 0
1622 }
1623 copy(history[remaining-len(buf):], buf)
1624 remaining -= len(buf)
1625 year, month, day := timestamp.Date()
1626 timestamp = time.Date(year, month, day, 0, 0, 0, 0, timestamp.Location()).Add(-1)
1627 }
1628
1629 for _, m := range history[remaining:] {
1630 m.Tags["batch"] = irc.TagValue(batchRef)
1631 dc.SendMessage(dc.marshalMessage(m, uc.network))
1632 }
1633
1634 dc.SendMessage(&irc.Message{
1635 Prefix: dc.srv.prefix(),
1636 Command: "BATCH",
1637 Params: []string{"-" + batchRef},
1638 })
1639 default:
1640 // TODO: support AFTER, LATEST, BETWEEN
1641 return ircError{&irc.Message{
1642 Command: "FAIL",
1643 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1644 }}
1645 }
1646 default:
1647 dc.logger.Printf("unhandled message: %v", msg)
1648 return newUnknownCommandError(msg.Command)
1649 }
1650 return nil
1651}
1652
1653func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1654 username, password, ok := parseNickServCredentials(text, uc.nick)
1655 if !ok {
1656 return
1657 }
1658
1659 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1660 // automatically erase the key pair or any other credentials.
1661 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1662 return
1663 }
1664
1665 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1666 n := uc.network
1667 n.SASL.Mechanism = "PLAIN"
1668 n.SASL.Plain.Username = username
1669 n.SASL.Plain.Password = password
1670 if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
1671 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1672 }
1673}
1674
1675func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1676 fields := strings.Fields(text)
1677 if len(fields) < 2 {
1678 return "", "", false
1679 }
1680 cmd := strings.ToUpper(fields[0])
1681 params := fields[1:]
1682 switch cmd {
1683 case "REGISTER":
1684 username = nick
1685 password = params[0]
1686 case "IDENTIFY":
1687 if len(params) == 1 {
1688 username = nick
1689 password = params[0]
1690 } else {
1691 username = params[0]
1692 password = params[1]
1693 }
1694 case "SET":
1695 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1696 username = nick
1697 password = params[1]
1698 }
1699 default:
1700 return "", "", false
1701 }
1702 return username, password, true
1703}
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