source: code/trunk/downstream.go@ 446

Last change on this file since 446 was 446, checked in by contact, 4 years ago

Send RPL_ISUPPORT CHATHISTORY token
File size: 45.6 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 "extended-join": "",
80 "multi-prefix": "",
81}
82
83type downstreamConn struct {
84 conn
85
86 id uint64
87
88 registered bool
89 user *user
90 nick string
91 rawUsername string
92 networkName string
93 clientName string
94 realname string
95 hostname string
96 password string // empty after authentication
97 network *network // can be nil
98
99 negociatingCaps bool
100 capVersion int
101 supportedCaps map[string]string
102 caps map[string]bool
103
104 saslServer sasl.Server
105}
106
107func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
108 remoteAddr := ic.RemoteAddr().String()
109 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
110 options := connOptions{Logger: logger}
111 dc := &downstreamConn{
112 conn: *newConn(srv, ic, &options),
113 id: id,
114 supportedCaps: make(map[string]string),
115 caps: make(map[string]bool),
116 }
117 dc.hostname = remoteAddr
118 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
119 dc.hostname = host
120 }
121 for k, v := range permanentDownstreamCaps {
122 dc.supportedCaps[k] = v
123 }
124 if srv.LogPath != "" {
125 dc.supportedCaps["draft/chathistory"] = ""
126 }
127 return dc
128}
129
130func (dc *downstreamConn) prefix() *irc.Prefix {
131 return &irc.Prefix{
132 Name: dc.nick,
133 User: dc.user.Username,
134 Host: dc.hostname,
135 }
136}
137
138func (dc *downstreamConn) forEachNetwork(f func(*network)) {
139 if dc.network != nil {
140 f(dc.network)
141 } else {
142 dc.user.forEachNetwork(f)
143 }
144}
145
146func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
147 dc.user.forEachUpstream(func(uc *upstreamConn) {
148 if dc.network != nil && uc.network != dc.network {
149 return
150 }
151 f(uc)
152 })
153}
154
155// upstream returns the upstream connection, if any. If there are zero or if
156// there are multiple upstream connections, it returns nil.
157func (dc *downstreamConn) upstream() *upstreamConn {
158 if dc.network == nil {
159 return nil
160 }
161 return dc.network.conn
162}
163
164func isOurNick(net *network, nick string) bool {
165 // TODO: this doesn't account for nick changes
166 if net.conn != nil {
167 return nick == net.conn.nick
168 }
169 // We're not currently connected to the upstream connection, so we don't
170 // know whether this name is our nickname. Best-effort: use the network's
171 // configured nickname and hope it was the one being used when we were
172 // connected.
173 return nick == net.Nick
174}
175
176// marshalEntity converts an upstream entity name (ie. channel or nick) into a
177// downstream entity name.
178//
179// This involves adding a "/<network>" suffix if the entity isn't the current
180// user.
181func (dc *downstreamConn) marshalEntity(net *network, name string) string {
182 if isOurNick(net, name) {
183 return dc.nick
184 }
185 if dc.network != nil {
186 if dc.network != net {
187 panic("soju: tried to marshal an entity for another network")
188 }
189 return name
190 }
191 return name + "/" + net.GetName()
192}
193
194func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
195 if isOurNick(net, prefix.Name) {
196 return dc.prefix()
197 }
198 if dc.network != nil {
199 if dc.network != net {
200 panic("soju: tried to marshal a user prefix for another network")
201 }
202 return prefix
203 }
204 return &irc.Prefix{
205 Name: prefix.Name + "/" + net.GetName(),
206 User: prefix.User,
207 Host: prefix.Host,
208 }
209}
210
211// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
212// an upstream entity name.
213//
214// This involves removing the "/<network>" suffix.
215func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
216 if uc := dc.upstream(); uc != nil {
217 return uc, name, nil
218 }
219
220 var conn *upstreamConn
221 if i := strings.LastIndexByte(name, '/'); i >= 0 {
222 network := name[i+1:]
223 name = name[:i]
224
225 dc.forEachUpstream(func(uc *upstreamConn) {
226 if network != uc.network.GetName() {
227 return
228 }
229 conn = uc
230 })
231 }
232
233 if conn == nil {
234 return nil, "", ircError{&irc.Message{
235 Command: irc.ERR_NOSUCHCHANNEL,
236 Params: []string{name, "No such channel"},
237 }}
238 }
239 return conn, name, nil
240}
241
242func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
243 if dc.upstream() != nil {
244 return text
245 }
246 // TODO: smarter parsing that ignores URLs
247 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
248}
249
250func (dc *downstreamConn) readMessages(ch chan<- event) error {
251 for {
252 msg, err := dc.ReadMessage()
253 if err == io.EOF {
254 break
255 } else if err != nil {
256 return fmt.Errorf("failed to read IRC command: %v", err)
257 }
258
259 ch <- eventDownstreamMessage{msg, dc}
260 }
261
262 return nil
263}
264
265// SendMessage sends an outgoing message.
266//
267// This can only called from the user goroutine.
268func (dc *downstreamConn) SendMessage(msg *irc.Message) {
269 if !dc.caps["message-tags"] {
270 if msg.Command == "TAGMSG" {
271 return
272 }
273 msg = msg.Copy()
274 for name := range msg.Tags {
275 supported := false
276 switch name {
277 case "time":
278 supported = dc.caps["server-time"]
279 }
280 if !supported {
281 delete(msg.Tags, name)
282 }
283 }
284 }
285 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
286 msg.Params = msg.Params[:1]
287 }
288
289 dc.conn.SendMessage(msg)
290}
291
292// sendMessageWithID sends an outgoing message with the specified internal ID.
293func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
294 dc.SendMessage(msg)
295
296 if id == "" || !dc.messageSupportsHistory(msg) {
297 return
298 }
299
300 dc.sendPing(id)
301}
302
303// advanceMessageWithID advances history to the specified message ID without
304// sending a message. This is useful e.g. for self-messages when echo-message
305// isn't enabled.
306func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
307 if id == "" || !dc.messageSupportsHistory(msg) {
308 return
309 }
310
311 dc.sendPing(id)
312}
313
314// ackMsgID acknowledges that a message has been received.
315func (dc *downstreamConn) ackMsgID(id string) {
316 netID, entity, _, err := parseMsgID(id)
317 if err != nil {
318 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
319 return
320 }
321
322 network := dc.user.getNetworkByID(netID)
323 if network == nil {
324 return
325 }
326
327 history, ok := network.history[entity]
328 if !ok {
329 return
330 }
331
332 history.clients[dc.clientName] = id
333}
334
335func (dc *downstreamConn) sendPing(msgID string) {
336 token := "soju-msgid-" + base64.RawURLEncoding.EncodeToString([]byte(msgID))
337 dc.SendMessage(&irc.Message{
338 Command: "PING",
339 Params: []string{token},
340 })
341}
342
343func (dc *downstreamConn) handlePong(token string) {
344 if !strings.HasPrefix(token, "soju-msgid-") {
345 dc.logger.Printf("received unrecognized PONG token %q", token)
346 return
347 }
348 token = strings.TrimPrefix(token, "soju-msgid-")
349 b, err := base64.RawURLEncoding.DecodeString(token)
350 if err != nil {
351 dc.logger.Printf("received malformed PONG token: %v", err)
352 return
353 }
354 msgID := string(b)
355
356 dc.ackMsgID(msgID)
357}
358
359// marshalMessage re-formats a message coming from an upstream connection so
360// that it's suitable for being sent on this downstream connection. Only
361// messages that may appear in logs are supported, except MODE.
362func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
363 msg = msg.Copy()
364 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
365
366 switch msg.Command {
367 case "PRIVMSG", "NOTICE", "TAGMSG":
368 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
369 case "NICK":
370 // Nick change for another user
371 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
372 case "JOIN", "PART":
373 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
374 case "KICK":
375 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
376 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
377 case "TOPIC":
378 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
379 case "QUIT":
380 // This space is intentionally left blank
381 default:
382 panic(fmt.Sprintf("unexpected %q message", msg.Command))
383 }
384
385 return msg
386}
387
388func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
389 switch msg.Command {
390 case "QUIT":
391 return dc.Close()
392 default:
393 if dc.registered {
394 return dc.handleMessageRegistered(msg)
395 } else {
396 return dc.handleMessageUnregistered(msg)
397 }
398 }
399}
400
401func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
402 switch msg.Command {
403 case "NICK":
404 var nick string
405 if err := parseMessageParams(msg, &nick); err != nil {
406 return err
407 }
408 if strings.ContainsAny(nick, illegalNickChars) {
409 return ircError{&irc.Message{
410 Command: irc.ERR_ERRONEUSNICKNAME,
411 Params: []string{dc.nick, nick, "contains illegal characters"},
412 }}
413 }
414 if nick == serviceNick {
415 return ircError{&irc.Message{
416 Command: irc.ERR_NICKNAMEINUSE,
417 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
418 }}
419 }
420 dc.nick = nick
421 case "USER":
422 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
423 return err
424 }
425 case "PASS":
426 if err := parseMessageParams(msg, &dc.password); err != nil {
427 return err
428 }
429 case "CAP":
430 var subCmd string
431 if err := parseMessageParams(msg, &subCmd); err != nil {
432 return err
433 }
434 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
435 return err
436 }
437 case "AUTHENTICATE":
438 if !dc.caps["sasl"] {
439 return ircError{&irc.Message{
440 Command: irc.ERR_SASLFAIL,
441 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
442 }}
443 }
444 if len(msg.Params) == 0 {
445 return ircError{&irc.Message{
446 Command: irc.ERR_SASLFAIL,
447 Params: []string{"*", "Missing AUTHENTICATE argument"},
448 }}
449 }
450 if dc.nick == "" {
451 return ircError{&irc.Message{
452 Command: irc.ERR_SASLFAIL,
453 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
454 }}
455 }
456
457 var resp []byte
458 if dc.saslServer == nil {
459 mech := strings.ToUpper(msg.Params[0])
460 switch mech {
461 case "PLAIN":
462 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
463 return dc.authenticate(username, password)
464 }))
465 default:
466 return ircError{&irc.Message{
467 Command: irc.ERR_SASLFAIL,
468 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
469 }}
470 }
471 } else if msg.Params[0] == "*" {
472 dc.saslServer = nil
473 return ircError{&irc.Message{
474 Command: irc.ERR_SASLABORTED,
475 Params: []string{"*", "SASL authentication aborted"},
476 }}
477 } else if msg.Params[0] == "+" {
478 resp = nil
479 } else {
480 // TODO: multi-line messages
481 var err error
482 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
483 if err != nil {
484 dc.saslServer = nil
485 return ircError{&irc.Message{
486 Command: irc.ERR_SASLFAIL,
487 Params: []string{"*", "Invalid base64-encoded response"},
488 }}
489 }
490 }
491
492 challenge, done, err := dc.saslServer.Next(resp)
493 if err != nil {
494 dc.saslServer = nil
495 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
496 return ircError{&irc.Message{
497 Command: irc.ERR_SASLFAIL,
498 Params: []string{"*", ircErr.Message.Params[1]},
499 }}
500 }
501 dc.SendMessage(&irc.Message{
502 Prefix: dc.srv.prefix(),
503 Command: irc.ERR_SASLFAIL,
504 Params: []string{"*", "SASL error"},
505 })
506 return fmt.Errorf("SASL authentication failed: %v", err)
507 } else if done {
508 dc.saslServer = nil
509 dc.SendMessage(&irc.Message{
510 Prefix: dc.srv.prefix(),
511 Command: irc.RPL_LOGGEDIN,
512 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
513 })
514 dc.SendMessage(&irc.Message{
515 Prefix: dc.srv.prefix(),
516 Command: irc.RPL_SASLSUCCESS,
517 Params: []string{dc.nick, "SASL authentication successful"},
518 })
519 } else {
520 challengeStr := "+"
521 if len(challenge) > 0 {
522 challengeStr = base64.StdEncoding.EncodeToString(challenge)
523 }
524
525 // TODO: multi-line messages
526 dc.SendMessage(&irc.Message{
527 Prefix: dc.srv.prefix(),
528 Command: "AUTHENTICATE",
529 Params: []string{challengeStr},
530 })
531 }
532 default:
533 dc.logger.Printf("unhandled message: %v", msg)
534 return newUnknownCommandError(msg.Command)
535 }
536 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
537 return dc.register()
538 }
539 return nil
540}
541
542func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
543 cmd = strings.ToUpper(cmd)
544
545 replyTo := dc.nick
546 if !dc.registered {
547 replyTo = "*"
548 }
549
550 switch cmd {
551 case "LS":
552 if len(args) > 0 {
553 var err error
554 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
555 return err
556 }
557 }
558 if !dc.registered && dc.capVersion >= 302 {
559 // Let downstream show everything it supports, and trim
560 // down the available capabilities when upstreams are
561 // known.
562 for k, v := range needAllDownstreamCaps {
563 dc.supportedCaps[k] = v
564 }
565 }
566
567 caps := make([]string, 0, len(dc.supportedCaps))
568 for k, v := range dc.supportedCaps {
569 if dc.capVersion >= 302 && v != "" {
570 caps = append(caps, k+"="+v)
571 } else {
572 caps = append(caps, k)
573 }
574 }
575
576 // TODO: multi-line replies
577 dc.SendMessage(&irc.Message{
578 Prefix: dc.srv.prefix(),
579 Command: "CAP",
580 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
581 })
582
583 if dc.capVersion >= 302 {
584 // CAP version 302 implicitly enables cap-notify
585 dc.caps["cap-notify"] = true
586 }
587
588 if !dc.registered {
589 dc.negociatingCaps = true
590 }
591 case "LIST":
592 var caps []string
593 for name := range dc.caps {
594 caps = append(caps, name)
595 }
596
597 // TODO: multi-line replies
598 dc.SendMessage(&irc.Message{
599 Prefix: dc.srv.prefix(),
600 Command: "CAP",
601 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
602 })
603 case "REQ":
604 if len(args) == 0 {
605 return ircError{&irc.Message{
606 Command: err_invalidcapcmd,
607 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
608 }}
609 }
610
611 // TODO: atomically ack/nak the whole capability set
612 caps := strings.Fields(args[0])
613 ack := true
614 for _, name := range caps {
615 name = strings.ToLower(name)
616 enable := !strings.HasPrefix(name, "-")
617 if !enable {
618 name = strings.TrimPrefix(name, "-")
619 }
620
621 if enable == dc.caps[name] {
622 continue
623 }
624
625 _, ok := dc.supportedCaps[name]
626 if !ok {
627 ack = false
628 break
629 }
630
631 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
632 // cap-notify cannot be disabled with CAP version 302
633 ack = false
634 break
635 }
636
637 dc.caps[name] = enable
638 }
639
640 reply := "NAK"
641 if ack {
642 reply = "ACK"
643 }
644 dc.SendMessage(&irc.Message{
645 Prefix: dc.srv.prefix(),
646 Command: "CAP",
647 Params: []string{replyTo, reply, args[0]},
648 })
649 case "END":
650 dc.negociatingCaps = false
651 default:
652 return ircError{&irc.Message{
653 Command: err_invalidcapcmd,
654 Params: []string{replyTo, cmd, "Unknown CAP command"},
655 }}
656 }
657 return nil
658}
659
660func (dc *downstreamConn) setSupportedCap(name, value string) {
661 prevValue, hasPrev := dc.supportedCaps[name]
662 changed := !hasPrev || prevValue != value
663 dc.supportedCaps[name] = value
664
665 if !dc.caps["cap-notify"] || !changed {
666 return
667 }
668
669 replyTo := dc.nick
670 if !dc.registered {
671 replyTo = "*"
672 }
673
674 cap := name
675 if value != "" && dc.capVersion >= 302 {
676 cap = name + "=" + value
677 }
678
679 dc.SendMessage(&irc.Message{
680 Prefix: dc.srv.prefix(),
681 Command: "CAP",
682 Params: []string{replyTo, "NEW", cap},
683 })
684}
685
686func (dc *downstreamConn) unsetSupportedCap(name string) {
687 _, hasPrev := dc.supportedCaps[name]
688 delete(dc.supportedCaps, name)
689 delete(dc.caps, name)
690
691 if !dc.caps["cap-notify"] || !hasPrev {
692 return
693 }
694
695 replyTo := dc.nick
696 if !dc.registered {
697 replyTo = "*"
698 }
699
700 dc.SendMessage(&irc.Message{
701 Prefix: dc.srv.prefix(),
702 Command: "CAP",
703 Params: []string{replyTo, "DEL", name},
704 })
705}
706
707func (dc *downstreamConn) updateSupportedCaps() {
708 supportedCaps := make(map[string]bool)
709 for cap := range needAllDownstreamCaps {
710 supportedCaps[cap] = true
711 }
712 dc.forEachUpstream(func(uc *upstreamConn) {
713 for cap, supported := range supportedCaps {
714 supportedCaps[cap] = supported && uc.caps[cap]
715 }
716 })
717
718 for cap, supported := range supportedCaps {
719 if supported {
720 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
721 } else {
722 dc.unsetSupportedCap(cap)
723 }
724 }
725}
726
727func (dc *downstreamConn) updateNick() {
728 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
729 dc.SendMessage(&irc.Message{
730 Prefix: dc.prefix(),
731 Command: "NICK",
732 Params: []string{uc.nick},
733 })
734 dc.nick = uc.nick
735 }
736}
737
738func sanityCheckServer(addr string) error {
739 dialer := net.Dialer{Timeout: 30 * time.Second}
740 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
741 if err != nil {
742 return err
743 }
744 return conn.Close()
745}
746
747func unmarshalUsername(rawUsername string) (username, client, network string) {
748 username = rawUsername
749
750 i := strings.IndexAny(username, "/@")
751 j := strings.LastIndexAny(username, "/@")
752 if i >= 0 {
753 username = rawUsername[:i]
754 }
755 if j >= 0 {
756 if rawUsername[j] == '@' {
757 client = rawUsername[j+1:]
758 } else {
759 network = rawUsername[j+1:]
760 }
761 }
762 if i >= 0 && j >= 0 && i < j {
763 if rawUsername[i] == '@' {
764 client = rawUsername[i+1 : j]
765 } else {
766 network = rawUsername[i+1 : j]
767 }
768 }
769
770 return username, client, network
771}
772
773func (dc *downstreamConn) authenticate(username, password string) error {
774 username, clientName, networkName := unmarshalUsername(username)
775
776 u, err := dc.srv.db.GetUser(username)
777 if err != nil {
778 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
779 return errAuthFailed
780 }
781
782 // Password auth disabled
783 if u.Password == "" {
784 return errAuthFailed
785 }
786
787 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
788 if err != nil {
789 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
790 return errAuthFailed
791 }
792
793 dc.user = dc.srv.getUser(username)
794 if dc.user == nil {
795 dc.logger.Printf("failed authentication for %q: user not active", username)
796 return errAuthFailed
797 }
798 dc.clientName = clientName
799 dc.networkName = networkName
800 return nil
801}
802
803func (dc *downstreamConn) register() error {
804 if dc.registered {
805 return fmt.Errorf("tried to register twice")
806 }
807
808 password := dc.password
809 dc.password = ""
810 if dc.user == nil {
811 if err := dc.authenticate(dc.rawUsername, password); err != nil {
812 return err
813 }
814 }
815
816 if dc.clientName == "" && dc.networkName == "" {
817 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
818 }
819
820 dc.registered = true
821 dc.logger.Printf("registration complete for user %q", dc.user.Username)
822 return nil
823}
824
825func (dc *downstreamConn) loadNetwork() error {
826 if dc.networkName == "" {
827 return nil
828 }
829
830 network := dc.user.getNetwork(dc.networkName)
831 if network == nil {
832 addr := dc.networkName
833 if !strings.ContainsRune(addr, ':') {
834 addr = addr + ":6697"
835 }
836
837 dc.logger.Printf("trying to connect to new network %q", addr)
838 if err := sanityCheckServer(addr); err != nil {
839 dc.logger.Printf("failed to connect to %q: %v", addr, err)
840 return ircError{&irc.Message{
841 Command: irc.ERR_PASSWDMISMATCH,
842 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
843 }}
844 }
845
846 // Some clients only allow specifying the nickname (and use the
847 // nickname as a username too). Strip the network name from the
848 // nickname when auto-saving networks.
849 nick, _, _ := unmarshalUsername(dc.nick)
850
851 dc.logger.Printf("auto-saving network %q", dc.networkName)
852 var err error
853 network, err = dc.user.createNetwork(&Network{
854 Addr: dc.networkName,
855 Nick: nick,
856 })
857 if err != nil {
858 return err
859 }
860 }
861
862 dc.network = network
863 return nil
864}
865
866func (dc *downstreamConn) welcome() error {
867 if dc.user == nil || !dc.registered {
868 panic("tried to welcome an unregistered connection")
869 }
870
871 // TODO: doing this might take some time. We should do it in dc.register
872 // instead, but we'll potentially be adding a new network and this must be
873 // done in the user goroutine.
874 if err := dc.loadNetwork(); err != nil {
875 return err
876 }
877
878 isupport := []string{
879 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
880 }
881
882 dc.SendMessage(&irc.Message{
883 Prefix: dc.srv.prefix(),
884 Command: irc.RPL_WELCOME,
885 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
886 })
887 dc.SendMessage(&irc.Message{
888 Prefix: dc.srv.prefix(),
889 Command: irc.RPL_YOURHOST,
890 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
891 })
892 dc.SendMessage(&irc.Message{
893 Prefix: dc.srv.prefix(),
894 Command: irc.RPL_CREATED,
895 Params: []string{dc.nick, "Who cares when the server was created?"},
896 })
897 dc.SendMessage(&irc.Message{
898 Prefix: dc.srv.prefix(),
899 Command: irc.RPL_MYINFO,
900 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
901 })
902 // TODO: other RPL_ISUPPORT tokens
903 dc.SendMessage(&irc.Message{
904 Prefix: dc.srv.prefix(),
905 Command: irc.RPL_ISUPPORT,
906 Params: append(append([]string{dc.nick}, isupport...), "are supported"),
907 })
908 dc.SendMessage(&irc.Message{
909 Prefix: dc.srv.prefix(),
910 Command: irc.ERR_NOMOTD,
911 Params: []string{dc.nick, "No MOTD"},
912 })
913
914 dc.updateNick()
915 dc.updateSupportedCaps()
916
917 dc.forEachUpstream(func(uc *upstreamConn) {
918 for _, ch := range uc.channels {
919 if !ch.complete {
920 continue
921 }
922 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
923 continue
924 }
925
926 dc.SendMessage(&irc.Message{
927 Prefix: dc.prefix(),
928 Command: "JOIN",
929 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
930 })
931
932 forwardChannel(dc, ch)
933 }
934 })
935
936 dc.forEachNetwork(func(net *network) {
937 // Only send history if we're the first connected client with that name
938 // for the network
939 if _, ok := net.offlineClients[dc.clientName]; ok {
940 dc.sendNetworkHistory(net)
941 delete(net.offlineClients, dc.clientName)
942 }
943
944 // Fast-forward history to last message
945 for target, history := range net.history {
946 if ch, ok := net.channels[target]; ok && ch.Detached {
947 continue
948 }
949
950 lastID, err := dc.user.msgStore.LastMsgID(net, target, time.Now())
951 if err != nil {
952 dc.logger.Printf("failed to get last message ID: %v", err)
953 continue
954 }
955 history.clients[dc.clientName] = lastID
956 }
957 })
958
959 return nil
960}
961
962// messageSupportsHistory checks whether the provided message can be sent as
963// part of an history batch.
964func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
965 // Don't replay all messages, because that would mess up client
966 // state. For instance we just sent the list of users, sending
967 // PART messages for one of these users would be incorrect.
968 // TODO: add support for draft/event-playback
969 switch msg.Command {
970 case "PRIVMSG", "NOTICE":
971 return true
972 }
973 return false
974}
975
976func (dc *downstreamConn) sendNetworkHistory(net *network) {
977 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
978 return
979 }
980 for target, history := range net.history {
981 if ch, ok := net.channels[target]; ok && ch.Detached {
982 continue
983 }
984
985 lastDelivered, ok := history.clients[dc.clientName]
986 if !ok {
987 continue
988 }
989
990 limit := 4000
991 history, err := dc.user.msgStore.LoadLatestID(net, target, lastDelivered, limit)
992 if err != nil {
993 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
994 continue
995 }
996
997 batchRef := "history"
998 if dc.caps["batch"] {
999 dc.SendMessage(&irc.Message{
1000 Prefix: dc.srv.prefix(),
1001 Command: "BATCH",
1002 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1003 })
1004 }
1005
1006 for _, msg := range history {
1007 if !dc.messageSupportsHistory(msg) {
1008 continue
1009 }
1010
1011 if dc.caps["batch"] {
1012 msg.Tags["batch"] = irc.TagValue(batchRef)
1013 }
1014 dc.SendMessage(dc.marshalMessage(msg, net))
1015 }
1016
1017 if dc.caps["batch"] {
1018 dc.SendMessage(&irc.Message{
1019 Prefix: dc.srv.prefix(),
1020 Command: "BATCH",
1021 Params: []string{"-" + batchRef},
1022 })
1023 }
1024 }
1025}
1026
1027func (dc *downstreamConn) runUntilRegistered() error {
1028 for !dc.registered {
1029 msg, err := dc.ReadMessage()
1030 if err != nil {
1031 return fmt.Errorf("failed to read IRC command: %v", err)
1032 }
1033
1034 err = dc.handleMessage(msg)
1035 if ircErr, ok := err.(ircError); ok {
1036 ircErr.Message.Prefix = dc.srv.prefix()
1037 dc.SendMessage(ircErr.Message)
1038 } else if err != nil {
1039 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1040 }
1041 }
1042
1043 return nil
1044}
1045
1046func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1047 switch msg.Command {
1048 case "CAP":
1049 var subCmd string
1050 if err := parseMessageParams(msg, &subCmd); err != nil {
1051 return err
1052 }
1053 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1054 return err
1055 }
1056 case "PING":
1057 var source, destination string
1058 if err := parseMessageParams(msg, &source); err != nil {
1059 return err
1060 }
1061 if len(msg.Params) > 1 {
1062 destination = msg.Params[1]
1063 }
1064 if destination != "" && destination != dc.srv.Hostname {
1065 return ircError{&irc.Message{
1066 Command: irc.ERR_NOSUCHSERVER,
1067 Params: []string{dc.nick, destination, "No such server"},
1068 }}
1069 }
1070 dc.SendMessage(&irc.Message{
1071 Prefix: dc.srv.prefix(),
1072 Command: "PONG",
1073 Params: []string{dc.srv.Hostname, source},
1074 })
1075 return nil
1076 case "PONG":
1077 if len(msg.Params) == 0 {
1078 return newNeedMoreParamsError(msg.Command)
1079 }
1080 token := msg.Params[len(msg.Params)-1]
1081 dc.handlePong(token)
1082 case "USER":
1083 return ircError{&irc.Message{
1084 Command: irc.ERR_ALREADYREGISTERED,
1085 Params: []string{dc.nick, "You may not reregister"},
1086 }}
1087 case "NICK":
1088 var rawNick string
1089 if err := parseMessageParams(msg, &rawNick); err != nil {
1090 return err
1091 }
1092
1093 nick := rawNick
1094 var upstream *upstreamConn
1095 if dc.upstream() == nil {
1096 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1097 if err == nil { // NICK nick/network: NICK only on a specific upstream
1098 upstream = uc
1099 nick = unmarshaledNick
1100 }
1101 }
1102
1103 if strings.ContainsAny(nick, illegalNickChars) {
1104 return ircError{&irc.Message{
1105 Command: irc.ERR_ERRONEUSNICKNAME,
1106 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1107 }}
1108 }
1109 if nick == serviceNick {
1110 return ircError{&irc.Message{
1111 Command: irc.ERR_NICKNAMEINUSE,
1112 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1113 }}
1114 }
1115
1116 var err error
1117 dc.forEachNetwork(func(n *network) {
1118 if err != nil || (upstream != nil && upstream.network != n) {
1119 return
1120 }
1121 n.Nick = nick
1122 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1123 })
1124 if err != nil {
1125 return err
1126 }
1127
1128 dc.forEachUpstream(func(uc *upstreamConn) {
1129 if upstream != nil && upstream != uc {
1130 return
1131 }
1132 uc.SendMessageLabeled(dc.id, &irc.Message{
1133 Command: "NICK",
1134 Params: []string{nick},
1135 })
1136 })
1137
1138 if dc.upstream() == nil && dc.nick != nick {
1139 dc.SendMessage(&irc.Message{
1140 Prefix: dc.prefix(),
1141 Command: "NICK",
1142 Params: []string{nick},
1143 })
1144 dc.nick = nick
1145 }
1146 case "JOIN":
1147 var namesStr string
1148 if err := parseMessageParams(msg, &namesStr); err != nil {
1149 return err
1150 }
1151
1152 var keys []string
1153 if len(msg.Params) > 1 {
1154 keys = strings.Split(msg.Params[1], ",")
1155 }
1156
1157 for i, name := range strings.Split(namesStr, ",") {
1158 uc, upstreamName, err := dc.unmarshalEntity(name)
1159 if err != nil {
1160 return err
1161 }
1162
1163 var key string
1164 if len(keys) > i {
1165 key = keys[i]
1166 }
1167
1168 params := []string{upstreamName}
1169 if key != "" {
1170 params = append(params, key)
1171 }
1172 uc.SendMessageLabeled(dc.id, &irc.Message{
1173 Command: "JOIN",
1174 Params: params,
1175 })
1176
1177 var ch *Channel
1178 var ok bool
1179 if ch, ok = uc.network.channels[upstreamName]; ok {
1180 // Don't clear the channel key if there's one set
1181 // TODO: add a way to unset the channel key
1182 if key != "" {
1183 ch.Key = key
1184 }
1185 uc.network.attach(ch)
1186 } else {
1187 ch = &Channel{
1188 Name: upstreamName,
1189 Key: key,
1190 }
1191 uc.network.channels[upstreamName] = ch
1192 }
1193 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1194 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1195 }
1196 }
1197 case "PART":
1198 var namesStr string
1199 if err := parseMessageParams(msg, &namesStr); err != nil {
1200 return err
1201 }
1202
1203 var reason string
1204 if len(msg.Params) > 1 {
1205 reason = msg.Params[1]
1206 }
1207
1208 for _, name := range strings.Split(namesStr, ",") {
1209 uc, upstreamName, err := dc.unmarshalEntity(name)
1210 if err != nil {
1211 return err
1212 }
1213
1214 if strings.EqualFold(reason, "detach") {
1215 var ch *Channel
1216 var ok bool
1217 if ch, ok = uc.network.channels[upstreamName]; ok {
1218 uc.network.detach(ch)
1219 } else {
1220 ch = &Channel{
1221 Name: name,
1222 Detached: true,
1223 }
1224 uc.network.channels[upstreamName] = ch
1225 }
1226 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1227 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1228 }
1229 } else {
1230 params := []string{upstreamName}
1231 if reason != "" {
1232 params = append(params, reason)
1233 }
1234 uc.SendMessageLabeled(dc.id, &irc.Message{
1235 Command: "PART",
1236 Params: params,
1237 })
1238
1239 if err := uc.network.deleteChannel(upstreamName); err != nil {
1240 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1241 }
1242 }
1243 }
1244 case "KICK":
1245 var channelStr, userStr string
1246 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1247 return err
1248 }
1249
1250 channels := strings.Split(channelStr, ",")
1251 users := strings.Split(userStr, ",")
1252
1253 var reason string
1254 if len(msg.Params) > 2 {
1255 reason = msg.Params[2]
1256 }
1257
1258 if len(channels) != 1 && len(channels) != len(users) {
1259 return ircError{&irc.Message{
1260 Command: irc.ERR_BADCHANMASK,
1261 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1262 }}
1263 }
1264
1265 for i, user := range users {
1266 var channel string
1267 if len(channels) == 1 {
1268 channel = channels[0]
1269 } else {
1270 channel = channels[i]
1271 }
1272
1273 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1274 if err != nil {
1275 return err
1276 }
1277
1278 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1279 if err != nil {
1280 return err
1281 }
1282
1283 if ucChannel != ucUser {
1284 return ircError{&irc.Message{
1285 Command: irc.ERR_USERNOTINCHANNEL,
1286 Params: []string{dc.nick, user, channel, "They are on another network"},
1287 }}
1288 }
1289 uc := ucChannel
1290
1291 params := []string{upstreamChannel, upstreamUser}
1292 if reason != "" {
1293 params = append(params, reason)
1294 }
1295 uc.SendMessageLabeled(dc.id, &irc.Message{
1296 Command: "KICK",
1297 Params: params,
1298 })
1299 }
1300 case "MODE":
1301 var name string
1302 if err := parseMessageParams(msg, &name); err != nil {
1303 return err
1304 }
1305
1306 var modeStr string
1307 if len(msg.Params) > 1 {
1308 modeStr = msg.Params[1]
1309 }
1310
1311 if name == dc.nick {
1312 if modeStr != "" {
1313 dc.forEachUpstream(func(uc *upstreamConn) {
1314 uc.SendMessageLabeled(dc.id, &irc.Message{
1315 Command: "MODE",
1316 Params: []string{uc.nick, modeStr},
1317 })
1318 })
1319 } else {
1320 dc.SendMessage(&irc.Message{
1321 Prefix: dc.srv.prefix(),
1322 Command: irc.RPL_UMODEIS,
1323 Params: []string{dc.nick, ""}, // TODO
1324 })
1325 }
1326 return nil
1327 }
1328
1329 uc, upstreamName, err := dc.unmarshalEntity(name)
1330 if err != nil {
1331 return err
1332 }
1333
1334 if !uc.isChannel(upstreamName) {
1335 return ircError{&irc.Message{
1336 Command: irc.ERR_USERSDONTMATCH,
1337 Params: []string{dc.nick, "Cannot change mode for other users"},
1338 }}
1339 }
1340
1341 if modeStr != "" {
1342 params := []string{upstreamName, modeStr}
1343 params = append(params, msg.Params[2:]...)
1344 uc.SendMessageLabeled(dc.id, &irc.Message{
1345 Command: "MODE",
1346 Params: params,
1347 })
1348 } else {
1349 ch, ok := uc.channels[upstreamName]
1350 if !ok {
1351 return ircError{&irc.Message{
1352 Command: irc.ERR_NOSUCHCHANNEL,
1353 Params: []string{dc.nick, name, "No such channel"},
1354 }}
1355 }
1356
1357 if ch.modes == nil {
1358 // we haven't received the initial RPL_CHANNELMODEIS yet
1359 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1360 return nil
1361 }
1362
1363 modeStr, modeParams := ch.modes.Format()
1364 params := []string{dc.nick, name, modeStr}
1365 params = append(params, modeParams...)
1366
1367 dc.SendMessage(&irc.Message{
1368 Prefix: dc.srv.prefix(),
1369 Command: irc.RPL_CHANNELMODEIS,
1370 Params: params,
1371 })
1372 if ch.creationTime != "" {
1373 dc.SendMessage(&irc.Message{
1374 Prefix: dc.srv.prefix(),
1375 Command: rpl_creationtime,
1376 Params: []string{dc.nick, name, ch.creationTime},
1377 })
1378 }
1379 }
1380 case "TOPIC":
1381 var channel string
1382 if err := parseMessageParams(msg, &channel); err != nil {
1383 return err
1384 }
1385
1386 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1387 if err != nil {
1388 return err
1389 }
1390
1391 if len(msg.Params) > 1 { // setting topic
1392 topic := msg.Params[1]
1393 uc.SendMessageLabeled(dc.id, &irc.Message{
1394 Command: "TOPIC",
1395 Params: []string{upstreamChannel, topic},
1396 })
1397 } else { // getting topic
1398 ch, ok := uc.channels[upstreamChannel]
1399 if !ok {
1400 return ircError{&irc.Message{
1401 Command: irc.ERR_NOSUCHCHANNEL,
1402 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1403 }}
1404 }
1405 sendTopic(dc, ch)
1406 }
1407 case "LIST":
1408 // TODO: support ELIST when supported by all upstreams
1409
1410 pl := pendingLIST{
1411 downstreamID: dc.id,
1412 pendingCommands: make(map[int64]*irc.Message),
1413 }
1414 var upstream *upstreamConn
1415 var upstreamChannels map[int64][]string
1416 if len(msg.Params) > 0 {
1417 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1418 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1419 upstream = uc
1420 } else {
1421 upstreamChannels = make(map[int64][]string)
1422 channels := strings.Split(msg.Params[0], ",")
1423 for _, channel := range channels {
1424 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1425 if err != nil {
1426 return err
1427 }
1428 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1429 }
1430 }
1431 }
1432
1433 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1434 dc.forEachUpstream(func(uc *upstreamConn) {
1435 if upstream != nil && upstream != uc {
1436 return
1437 }
1438 var params []string
1439 if upstreamChannels != nil {
1440 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1441 params = []string{strings.Join(channels, ",")}
1442 } else {
1443 return
1444 }
1445 }
1446 pl.pendingCommands[uc.network.ID] = &irc.Message{
1447 Command: "LIST",
1448 Params: params,
1449 }
1450 uc.trySendLIST(dc.id)
1451 })
1452 case "NAMES":
1453 if len(msg.Params) == 0 {
1454 dc.SendMessage(&irc.Message{
1455 Prefix: dc.srv.prefix(),
1456 Command: irc.RPL_ENDOFNAMES,
1457 Params: []string{dc.nick, "*", "End of /NAMES list"},
1458 })
1459 return nil
1460 }
1461
1462 channels := strings.Split(msg.Params[0], ",")
1463 for _, channel := range channels {
1464 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1465 if err != nil {
1466 return err
1467 }
1468
1469 ch, ok := uc.channels[upstreamChannel]
1470 if ok {
1471 sendNames(dc, ch)
1472 } else {
1473 // NAMES on a channel we have not joined, ask upstream
1474 uc.SendMessageLabeled(dc.id, &irc.Message{
1475 Command: "NAMES",
1476 Params: []string{upstreamChannel},
1477 })
1478 }
1479 }
1480 case "WHO":
1481 if len(msg.Params) == 0 {
1482 // TODO: support WHO without parameters
1483 dc.SendMessage(&irc.Message{
1484 Prefix: dc.srv.prefix(),
1485 Command: irc.RPL_ENDOFWHO,
1486 Params: []string{dc.nick, "*", "End of /WHO list"},
1487 })
1488 return nil
1489 }
1490
1491 // TODO: support WHO masks
1492 entity := msg.Params[0]
1493
1494 if entity == dc.nick {
1495 // TODO: support AWAY (H/G) in self WHO reply
1496 dc.SendMessage(&irc.Message{
1497 Prefix: dc.srv.prefix(),
1498 Command: irc.RPL_WHOREPLY,
1499 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1500 })
1501 dc.SendMessage(&irc.Message{
1502 Prefix: dc.srv.prefix(),
1503 Command: irc.RPL_ENDOFWHO,
1504 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1505 })
1506 return nil
1507 }
1508 if entity == serviceNick {
1509 dc.SendMessage(&irc.Message{
1510 Prefix: dc.srv.prefix(),
1511 Command: irc.RPL_WHOREPLY,
1512 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1513 })
1514 dc.SendMessage(&irc.Message{
1515 Prefix: dc.srv.prefix(),
1516 Command: irc.RPL_ENDOFWHO,
1517 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1518 })
1519 return nil
1520 }
1521
1522 uc, upstreamName, err := dc.unmarshalEntity(entity)
1523 if err != nil {
1524 return err
1525 }
1526
1527 var params []string
1528 if len(msg.Params) == 2 {
1529 params = []string{upstreamName, msg.Params[1]}
1530 } else {
1531 params = []string{upstreamName}
1532 }
1533
1534 uc.SendMessageLabeled(dc.id, &irc.Message{
1535 Command: "WHO",
1536 Params: params,
1537 })
1538 case "WHOIS":
1539 if len(msg.Params) == 0 {
1540 return ircError{&irc.Message{
1541 Command: irc.ERR_NONICKNAMEGIVEN,
1542 Params: []string{dc.nick, "No nickname given"},
1543 }}
1544 }
1545
1546 var target, mask string
1547 if len(msg.Params) == 1 {
1548 target = ""
1549 mask = msg.Params[0]
1550 } else {
1551 target = msg.Params[0]
1552 mask = msg.Params[1]
1553 }
1554 // TODO: support multiple WHOIS users
1555 if i := strings.IndexByte(mask, ','); i >= 0 {
1556 mask = mask[:i]
1557 }
1558
1559 if mask == dc.nick {
1560 dc.SendMessage(&irc.Message{
1561 Prefix: dc.srv.prefix(),
1562 Command: irc.RPL_WHOISUSER,
1563 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1564 })
1565 dc.SendMessage(&irc.Message{
1566 Prefix: dc.srv.prefix(),
1567 Command: irc.RPL_WHOISSERVER,
1568 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1569 })
1570 dc.SendMessage(&irc.Message{
1571 Prefix: dc.srv.prefix(),
1572 Command: irc.RPL_ENDOFWHOIS,
1573 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1574 })
1575 return nil
1576 }
1577
1578 // TODO: support WHOIS masks
1579 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1580 if err != nil {
1581 return err
1582 }
1583
1584 var params []string
1585 if target != "" {
1586 if target == mask { // WHOIS nick nick
1587 params = []string{upstreamNick, upstreamNick}
1588 } else {
1589 params = []string{target, upstreamNick}
1590 }
1591 } else {
1592 params = []string{upstreamNick}
1593 }
1594
1595 uc.SendMessageLabeled(dc.id, &irc.Message{
1596 Command: "WHOIS",
1597 Params: params,
1598 })
1599 case "PRIVMSG":
1600 var targetsStr, text string
1601 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1602 return err
1603 }
1604 tags := copyClientTags(msg.Tags)
1605
1606 for _, name := range strings.Split(targetsStr, ",") {
1607 if name == serviceNick {
1608 if dc.caps["echo-message"] {
1609 echoTags := tags.Copy()
1610 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1611 dc.SendMessage(&irc.Message{
1612 Tags: echoTags,
1613 Prefix: dc.prefix(),
1614 Command: "PRIVMSG",
1615 Params: []string{name, text},
1616 })
1617 }
1618 handleServicePRIVMSG(dc, text)
1619 continue
1620 }
1621
1622 uc, upstreamName, err := dc.unmarshalEntity(name)
1623 if err != nil {
1624 return err
1625 }
1626
1627 if upstreamName == "NickServ" {
1628 dc.handleNickServPRIVMSG(uc, text)
1629 }
1630
1631 unmarshaledText := text
1632 if uc.isChannel(upstreamName) {
1633 unmarshaledText = dc.unmarshalText(uc, text)
1634 }
1635 uc.SendMessageLabeled(dc.id, &irc.Message{
1636 Tags: tags,
1637 Command: "PRIVMSG",
1638 Params: []string{upstreamName, unmarshaledText},
1639 })
1640
1641 echoTags := tags.Copy()
1642 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1643 echoMsg := &irc.Message{
1644 Tags: echoTags,
1645 Prefix: &irc.Prefix{
1646 Name: uc.nick,
1647 User: uc.username,
1648 },
1649 Command: "PRIVMSG",
1650 Params: []string{upstreamName, text},
1651 }
1652 uc.produce(upstreamName, echoMsg, dc)
1653
1654 uc.updateChannelAutoDetach(upstreamName)
1655 }
1656 case "NOTICE":
1657 var targetsStr, text string
1658 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1659 return err
1660 }
1661 tags := copyClientTags(msg.Tags)
1662
1663 for _, name := range strings.Split(targetsStr, ",") {
1664 uc, upstreamName, err := dc.unmarshalEntity(name)
1665 if err != nil {
1666 return err
1667 }
1668
1669 unmarshaledText := text
1670 if uc.isChannel(upstreamName) {
1671 unmarshaledText = dc.unmarshalText(uc, text)
1672 }
1673 uc.SendMessageLabeled(dc.id, &irc.Message{
1674 Tags: tags,
1675 Command: "NOTICE",
1676 Params: []string{upstreamName, unmarshaledText},
1677 })
1678
1679 uc.updateChannelAutoDetach(upstreamName)
1680 }
1681 case "TAGMSG":
1682 var targetsStr string
1683 if err := parseMessageParams(msg, &targetsStr); err != nil {
1684 return err
1685 }
1686 tags := copyClientTags(msg.Tags)
1687
1688 for _, name := range strings.Split(targetsStr, ",") {
1689 uc, upstreamName, err := dc.unmarshalEntity(name)
1690 if err != nil {
1691 return err
1692 }
1693 if _, ok := uc.caps["message-tags"]; !ok {
1694 continue
1695 }
1696
1697 uc.SendMessageLabeled(dc.id, &irc.Message{
1698 Tags: tags,
1699 Command: "TAGMSG",
1700 Params: []string{upstreamName},
1701 })
1702
1703 uc.updateChannelAutoDetach(upstreamName)
1704 }
1705 case "INVITE":
1706 var user, channel string
1707 if err := parseMessageParams(msg, &user, &channel); err != nil {
1708 return err
1709 }
1710
1711 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1712 if err != nil {
1713 return err
1714 }
1715
1716 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1717 if err != nil {
1718 return err
1719 }
1720
1721 if ucChannel != ucUser {
1722 return ircError{&irc.Message{
1723 Command: irc.ERR_USERNOTINCHANNEL,
1724 Params: []string{dc.nick, user, channel, "They are on another network"},
1725 }}
1726 }
1727 uc := ucChannel
1728
1729 uc.SendMessageLabeled(dc.id, &irc.Message{
1730 Command: "INVITE",
1731 Params: []string{upstreamUser, upstreamChannel},
1732 })
1733 case "CHATHISTORY":
1734 var subcommand string
1735 if err := parseMessageParams(msg, &subcommand); err != nil {
1736 return err
1737 }
1738 var target, criteria, limitStr string
1739 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1740 return ircError{&irc.Message{
1741 Command: "FAIL",
1742 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1743 }}
1744 }
1745
1746 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1747 if !ok {
1748 return ircError{&irc.Message{
1749 Command: irc.ERR_UNKNOWNCOMMAND,
1750 Params: []string{dc.nick, subcommand, "Unknown command"},
1751 }}
1752 }
1753
1754 uc, entity, err := dc.unmarshalEntity(target)
1755 if err != nil {
1756 return err
1757 }
1758
1759 // TODO: support msgid criteria
1760 criteriaParts := strings.SplitN(criteria, "=", 2)
1761 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1762 return ircError{&irc.Message{
1763 Command: "FAIL",
1764 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1765 }}
1766 }
1767
1768 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1769 if err != nil {
1770 return ircError{&irc.Message{
1771 Command: "FAIL",
1772 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1773 }}
1774 }
1775
1776 limit, err := strconv.Atoi(limitStr)
1777 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1778 return ircError{&irc.Message{
1779 Command: "FAIL",
1780 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1781 }}
1782 }
1783
1784 var history []*irc.Message
1785 switch subcommand {
1786 case "BEFORE":
1787 history, err = store.LoadBeforeTime(uc.network, entity, timestamp, limit)
1788 case "AFTER":
1789 history, err = store.LoadAfterTime(uc.network, entity, timestamp, limit)
1790 default:
1791 // TODO: support LATEST, BETWEEN
1792 return ircError{&irc.Message{
1793 Command: "FAIL",
1794 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1795 }}
1796 }
1797 if err != nil {
1798 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1799 return newChatHistoryError(subcommand, target)
1800 }
1801
1802 batchRef := "history"
1803 dc.SendMessage(&irc.Message{
1804 Prefix: dc.srv.prefix(),
1805 Command: "BATCH",
1806 Params: []string{"+" + batchRef, "chathistory", target},
1807 })
1808
1809 for _, msg := range history {
1810 msg.Tags["batch"] = irc.TagValue(batchRef)
1811 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1812 }
1813
1814 dc.SendMessage(&irc.Message{
1815 Prefix: dc.srv.prefix(),
1816 Command: "BATCH",
1817 Params: []string{"-" + batchRef},
1818 })
1819 default:
1820 dc.logger.Printf("unhandled message: %v", msg)
1821 return newUnknownCommandError(msg.Command)
1822 }
1823 return nil
1824}
1825
1826func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1827 username, password, ok := parseNickServCredentials(text, uc.nick)
1828 if !ok {
1829 return
1830 }
1831
1832 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1833 // automatically erase the key pair or any other credentials.
1834 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1835 return
1836 }
1837
1838 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1839 n := uc.network
1840 n.SASL.Mechanism = "PLAIN"
1841 n.SASL.Plain.Username = username
1842 n.SASL.Plain.Password = password
1843 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1844 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1845 }
1846}
1847
1848func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1849 fields := strings.Fields(text)
1850 if len(fields) < 2 {
1851 return "", "", false
1852 }
1853 cmd := strings.ToUpper(fields[0])
1854 params := fields[1:]
1855 switch cmd {
1856 case "REGISTER":
1857 username = nick
1858 password = params[0]
1859 case "IDENTIFY":
1860 if len(params) == 1 {
1861 username = nick
1862 password = params[0]
1863 } else {
1864 username = params[0]
1865 password = params[1]
1866 }
1867 case "SET":
1868 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1869 username = nick
1870 password = params[1]
1871 }
1872 default:
1873 return "", "", false
1874 }
1875 return username, password, true
1876}
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