source: code/trunk/downstream.go@ 447

Last change on this file since 447 was 447, checked in by contact, 4 years ago

Forward ISUPPORT NETWORK token
File size: 45.7 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 if uc := dc.upstream(); uc != nil && uc.networkName != "" {
883 isupport = append(isupport, fmt.Sprintf("NETWORK=%v", uc.networkName))
884 }
885
886 dc.SendMessage(&irc.Message{
887 Prefix: dc.srv.prefix(),
888 Command: irc.RPL_WELCOME,
889 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
890 })
891 dc.SendMessage(&irc.Message{
892 Prefix: dc.srv.prefix(),
893 Command: irc.RPL_YOURHOST,
894 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
895 })
896 dc.SendMessage(&irc.Message{
897 Prefix: dc.srv.prefix(),
898 Command: irc.RPL_CREATED,
899 Params: []string{dc.nick, "Who cares when the server was created?"},
900 })
901 dc.SendMessage(&irc.Message{
902 Prefix: dc.srv.prefix(),
903 Command: irc.RPL_MYINFO,
904 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
905 })
906 // TODO: other RPL_ISUPPORT tokens
907 dc.SendMessage(&irc.Message{
908 Prefix: dc.srv.prefix(),
909 Command: irc.RPL_ISUPPORT,
910 Params: append(append([]string{dc.nick}, isupport...), "are supported"),
911 })
912 dc.SendMessage(&irc.Message{
913 Prefix: dc.srv.prefix(),
914 Command: irc.ERR_NOMOTD,
915 Params: []string{dc.nick, "No MOTD"},
916 })
917
918 dc.updateNick()
919 dc.updateSupportedCaps()
920
921 dc.forEachUpstream(func(uc *upstreamConn) {
922 for _, ch := range uc.channels {
923 if !ch.complete {
924 continue
925 }
926 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
927 continue
928 }
929
930 dc.SendMessage(&irc.Message{
931 Prefix: dc.prefix(),
932 Command: "JOIN",
933 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
934 })
935
936 forwardChannel(dc, ch)
937 }
938 })
939
940 dc.forEachNetwork(func(net *network) {
941 // Only send history if we're the first connected client with that name
942 // for the network
943 if _, ok := net.offlineClients[dc.clientName]; ok {
944 dc.sendNetworkHistory(net)
945 delete(net.offlineClients, dc.clientName)
946 }
947
948 // Fast-forward history to last message
949 for target, history := range net.history {
950 if ch, ok := net.channels[target]; ok && ch.Detached {
951 continue
952 }
953
954 lastID, err := dc.user.msgStore.LastMsgID(net, target, time.Now())
955 if err != nil {
956 dc.logger.Printf("failed to get last message ID: %v", err)
957 continue
958 }
959 history.clients[dc.clientName] = lastID
960 }
961 })
962
963 return nil
964}
965
966// messageSupportsHistory checks whether the provided message can be sent as
967// part of an history batch.
968func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
969 // Don't replay all messages, because that would mess up client
970 // state. For instance we just sent the list of users, sending
971 // PART messages for one of these users would be incorrect.
972 // TODO: add support for draft/event-playback
973 switch msg.Command {
974 case "PRIVMSG", "NOTICE":
975 return true
976 }
977 return false
978}
979
980func (dc *downstreamConn) sendNetworkHistory(net *network) {
981 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
982 return
983 }
984 for target, history := range net.history {
985 if ch, ok := net.channels[target]; ok && ch.Detached {
986 continue
987 }
988
989 lastDelivered, ok := history.clients[dc.clientName]
990 if !ok {
991 continue
992 }
993
994 limit := 4000
995 history, err := dc.user.msgStore.LoadLatestID(net, target, lastDelivered, limit)
996 if err != nil {
997 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
998 continue
999 }
1000
1001 batchRef := "history"
1002 if dc.caps["batch"] {
1003 dc.SendMessage(&irc.Message{
1004 Prefix: dc.srv.prefix(),
1005 Command: "BATCH",
1006 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1007 })
1008 }
1009
1010 for _, msg := range history {
1011 if !dc.messageSupportsHistory(msg) {
1012 continue
1013 }
1014
1015 if dc.caps["batch"] {
1016 msg.Tags["batch"] = irc.TagValue(batchRef)
1017 }
1018 dc.SendMessage(dc.marshalMessage(msg, net))
1019 }
1020
1021 if dc.caps["batch"] {
1022 dc.SendMessage(&irc.Message{
1023 Prefix: dc.srv.prefix(),
1024 Command: "BATCH",
1025 Params: []string{"-" + batchRef},
1026 })
1027 }
1028 }
1029}
1030
1031func (dc *downstreamConn) runUntilRegistered() error {
1032 for !dc.registered {
1033 msg, err := dc.ReadMessage()
1034 if err != nil {
1035 return fmt.Errorf("failed to read IRC command: %v", err)
1036 }
1037
1038 err = dc.handleMessage(msg)
1039 if ircErr, ok := err.(ircError); ok {
1040 ircErr.Message.Prefix = dc.srv.prefix()
1041 dc.SendMessage(ircErr.Message)
1042 } else if err != nil {
1043 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1044 }
1045 }
1046
1047 return nil
1048}
1049
1050func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1051 switch msg.Command {
1052 case "CAP":
1053 var subCmd string
1054 if err := parseMessageParams(msg, &subCmd); err != nil {
1055 return err
1056 }
1057 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1058 return err
1059 }
1060 case "PING":
1061 var source, destination string
1062 if err := parseMessageParams(msg, &source); err != nil {
1063 return err
1064 }
1065 if len(msg.Params) > 1 {
1066 destination = msg.Params[1]
1067 }
1068 if destination != "" && destination != dc.srv.Hostname {
1069 return ircError{&irc.Message{
1070 Command: irc.ERR_NOSUCHSERVER,
1071 Params: []string{dc.nick, destination, "No such server"},
1072 }}
1073 }
1074 dc.SendMessage(&irc.Message{
1075 Prefix: dc.srv.prefix(),
1076 Command: "PONG",
1077 Params: []string{dc.srv.Hostname, source},
1078 })
1079 return nil
1080 case "PONG":
1081 if len(msg.Params) == 0 {
1082 return newNeedMoreParamsError(msg.Command)
1083 }
1084 token := msg.Params[len(msg.Params)-1]
1085 dc.handlePong(token)
1086 case "USER":
1087 return ircError{&irc.Message{
1088 Command: irc.ERR_ALREADYREGISTERED,
1089 Params: []string{dc.nick, "You may not reregister"},
1090 }}
1091 case "NICK":
1092 var rawNick string
1093 if err := parseMessageParams(msg, &rawNick); err != nil {
1094 return err
1095 }
1096
1097 nick := rawNick
1098 var upstream *upstreamConn
1099 if dc.upstream() == nil {
1100 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1101 if err == nil { // NICK nick/network: NICK only on a specific upstream
1102 upstream = uc
1103 nick = unmarshaledNick
1104 }
1105 }
1106
1107 if strings.ContainsAny(nick, illegalNickChars) {
1108 return ircError{&irc.Message{
1109 Command: irc.ERR_ERRONEUSNICKNAME,
1110 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1111 }}
1112 }
1113 if nick == serviceNick {
1114 return ircError{&irc.Message{
1115 Command: irc.ERR_NICKNAMEINUSE,
1116 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1117 }}
1118 }
1119
1120 var err error
1121 dc.forEachNetwork(func(n *network) {
1122 if err != nil || (upstream != nil && upstream.network != n) {
1123 return
1124 }
1125 n.Nick = nick
1126 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1127 })
1128 if err != nil {
1129 return err
1130 }
1131
1132 dc.forEachUpstream(func(uc *upstreamConn) {
1133 if upstream != nil && upstream != uc {
1134 return
1135 }
1136 uc.SendMessageLabeled(dc.id, &irc.Message{
1137 Command: "NICK",
1138 Params: []string{nick},
1139 })
1140 })
1141
1142 if dc.upstream() == nil && dc.nick != nick {
1143 dc.SendMessage(&irc.Message{
1144 Prefix: dc.prefix(),
1145 Command: "NICK",
1146 Params: []string{nick},
1147 })
1148 dc.nick = nick
1149 }
1150 case "JOIN":
1151 var namesStr string
1152 if err := parseMessageParams(msg, &namesStr); err != nil {
1153 return err
1154 }
1155
1156 var keys []string
1157 if len(msg.Params) > 1 {
1158 keys = strings.Split(msg.Params[1], ",")
1159 }
1160
1161 for i, name := range strings.Split(namesStr, ",") {
1162 uc, upstreamName, err := dc.unmarshalEntity(name)
1163 if err != nil {
1164 return err
1165 }
1166
1167 var key string
1168 if len(keys) > i {
1169 key = keys[i]
1170 }
1171
1172 params := []string{upstreamName}
1173 if key != "" {
1174 params = append(params, key)
1175 }
1176 uc.SendMessageLabeled(dc.id, &irc.Message{
1177 Command: "JOIN",
1178 Params: params,
1179 })
1180
1181 var ch *Channel
1182 var ok bool
1183 if ch, ok = uc.network.channels[upstreamName]; ok {
1184 // Don't clear the channel key if there's one set
1185 // TODO: add a way to unset the channel key
1186 if key != "" {
1187 ch.Key = key
1188 }
1189 uc.network.attach(ch)
1190 } else {
1191 ch = &Channel{
1192 Name: upstreamName,
1193 Key: key,
1194 }
1195 uc.network.channels[upstreamName] = ch
1196 }
1197 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1198 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1199 }
1200 }
1201 case "PART":
1202 var namesStr string
1203 if err := parseMessageParams(msg, &namesStr); err != nil {
1204 return err
1205 }
1206
1207 var reason string
1208 if len(msg.Params) > 1 {
1209 reason = msg.Params[1]
1210 }
1211
1212 for _, name := range strings.Split(namesStr, ",") {
1213 uc, upstreamName, err := dc.unmarshalEntity(name)
1214 if err != nil {
1215 return err
1216 }
1217
1218 if strings.EqualFold(reason, "detach") {
1219 var ch *Channel
1220 var ok bool
1221 if ch, ok = uc.network.channels[upstreamName]; ok {
1222 uc.network.detach(ch)
1223 } else {
1224 ch = &Channel{
1225 Name: name,
1226 Detached: true,
1227 }
1228 uc.network.channels[upstreamName] = ch
1229 }
1230 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1231 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1232 }
1233 } else {
1234 params := []string{upstreamName}
1235 if reason != "" {
1236 params = append(params, reason)
1237 }
1238 uc.SendMessageLabeled(dc.id, &irc.Message{
1239 Command: "PART",
1240 Params: params,
1241 })
1242
1243 if err := uc.network.deleteChannel(upstreamName); err != nil {
1244 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1245 }
1246 }
1247 }
1248 case "KICK":
1249 var channelStr, userStr string
1250 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1251 return err
1252 }
1253
1254 channels := strings.Split(channelStr, ",")
1255 users := strings.Split(userStr, ",")
1256
1257 var reason string
1258 if len(msg.Params) > 2 {
1259 reason = msg.Params[2]
1260 }
1261
1262 if len(channels) != 1 && len(channels) != len(users) {
1263 return ircError{&irc.Message{
1264 Command: irc.ERR_BADCHANMASK,
1265 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1266 }}
1267 }
1268
1269 for i, user := range users {
1270 var channel string
1271 if len(channels) == 1 {
1272 channel = channels[0]
1273 } else {
1274 channel = channels[i]
1275 }
1276
1277 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1278 if err != nil {
1279 return err
1280 }
1281
1282 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1283 if err != nil {
1284 return err
1285 }
1286
1287 if ucChannel != ucUser {
1288 return ircError{&irc.Message{
1289 Command: irc.ERR_USERNOTINCHANNEL,
1290 Params: []string{dc.nick, user, channel, "They are on another network"},
1291 }}
1292 }
1293 uc := ucChannel
1294
1295 params := []string{upstreamChannel, upstreamUser}
1296 if reason != "" {
1297 params = append(params, reason)
1298 }
1299 uc.SendMessageLabeled(dc.id, &irc.Message{
1300 Command: "KICK",
1301 Params: params,
1302 })
1303 }
1304 case "MODE":
1305 var name string
1306 if err := parseMessageParams(msg, &name); err != nil {
1307 return err
1308 }
1309
1310 var modeStr string
1311 if len(msg.Params) > 1 {
1312 modeStr = msg.Params[1]
1313 }
1314
1315 if name == dc.nick {
1316 if modeStr != "" {
1317 dc.forEachUpstream(func(uc *upstreamConn) {
1318 uc.SendMessageLabeled(dc.id, &irc.Message{
1319 Command: "MODE",
1320 Params: []string{uc.nick, modeStr},
1321 })
1322 })
1323 } else {
1324 dc.SendMessage(&irc.Message{
1325 Prefix: dc.srv.prefix(),
1326 Command: irc.RPL_UMODEIS,
1327 Params: []string{dc.nick, ""}, // TODO
1328 })
1329 }
1330 return nil
1331 }
1332
1333 uc, upstreamName, err := dc.unmarshalEntity(name)
1334 if err != nil {
1335 return err
1336 }
1337
1338 if !uc.isChannel(upstreamName) {
1339 return ircError{&irc.Message{
1340 Command: irc.ERR_USERSDONTMATCH,
1341 Params: []string{dc.nick, "Cannot change mode for other users"},
1342 }}
1343 }
1344
1345 if modeStr != "" {
1346 params := []string{upstreamName, modeStr}
1347 params = append(params, msg.Params[2:]...)
1348 uc.SendMessageLabeled(dc.id, &irc.Message{
1349 Command: "MODE",
1350 Params: params,
1351 })
1352 } else {
1353 ch, ok := uc.channels[upstreamName]
1354 if !ok {
1355 return ircError{&irc.Message{
1356 Command: irc.ERR_NOSUCHCHANNEL,
1357 Params: []string{dc.nick, name, "No such channel"},
1358 }}
1359 }
1360
1361 if ch.modes == nil {
1362 // we haven't received the initial RPL_CHANNELMODEIS yet
1363 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1364 return nil
1365 }
1366
1367 modeStr, modeParams := ch.modes.Format()
1368 params := []string{dc.nick, name, modeStr}
1369 params = append(params, modeParams...)
1370
1371 dc.SendMessage(&irc.Message{
1372 Prefix: dc.srv.prefix(),
1373 Command: irc.RPL_CHANNELMODEIS,
1374 Params: params,
1375 })
1376 if ch.creationTime != "" {
1377 dc.SendMessage(&irc.Message{
1378 Prefix: dc.srv.prefix(),
1379 Command: rpl_creationtime,
1380 Params: []string{dc.nick, name, ch.creationTime},
1381 })
1382 }
1383 }
1384 case "TOPIC":
1385 var channel string
1386 if err := parseMessageParams(msg, &channel); err != nil {
1387 return err
1388 }
1389
1390 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1391 if err != nil {
1392 return err
1393 }
1394
1395 if len(msg.Params) > 1 { // setting topic
1396 topic := msg.Params[1]
1397 uc.SendMessageLabeled(dc.id, &irc.Message{
1398 Command: "TOPIC",
1399 Params: []string{upstreamChannel, topic},
1400 })
1401 } else { // getting topic
1402 ch, ok := uc.channels[upstreamChannel]
1403 if !ok {
1404 return ircError{&irc.Message{
1405 Command: irc.ERR_NOSUCHCHANNEL,
1406 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1407 }}
1408 }
1409 sendTopic(dc, ch)
1410 }
1411 case "LIST":
1412 // TODO: support ELIST when supported by all upstreams
1413
1414 pl := pendingLIST{
1415 downstreamID: dc.id,
1416 pendingCommands: make(map[int64]*irc.Message),
1417 }
1418 var upstream *upstreamConn
1419 var upstreamChannels map[int64][]string
1420 if len(msg.Params) > 0 {
1421 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1422 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1423 upstream = uc
1424 } else {
1425 upstreamChannels = make(map[int64][]string)
1426 channels := strings.Split(msg.Params[0], ",")
1427 for _, channel := range channels {
1428 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1429 if err != nil {
1430 return err
1431 }
1432 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1433 }
1434 }
1435 }
1436
1437 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1438 dc.forEachUpstream(func(uc *upstreamConn) {
1439 if upstream != nil && upstream != uc {
1440 return
1441 }
1442 var params []string
1443 if upstreamChannels != nil {
1444 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1445 params = []string{strings.Join(channels, ",")}
1446 } else {
1447 return
1448 }
1449 }
1450 pl.pendingCommands[uc.network.ID] = &irc.Message{
1451 Command: "LIST",
1452 Params: params,
1453 }
1454 uc.trySendLIST(dc.id)
1455 })
1456 case "NAMES":
1457 if len(msg.Params) == 0 {
1458 dc.SendMessage(&irc.Message{
1459 Prefix: dc.srv.prefix(),
1460 Command: irc.RPL_ENDOFNAMES,
1461 Params: []string{dc.nick, "*", "End of /NAMES list"},
1462 })
1463 return nil
1464 }
1465
1466 channels := strings.Split(msg.Params[0], ",")
1467 for _, channel := range channels {
1468 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1469 if err != nil {
1470 return err
1471 }
1472
1473 ch, ok := uc.channels[upstreamChannel]
1474 if ok {
1475 sendNames(dc, ch)
1476 } else {
1477 // NAMES on a channel we have not joined, ask upstream
1478 uc.SendMessageLabeled(dc.id, &irc.Message{
1479 Command: "NAMES",
1480 Params: []string{upstreamChannel},
1481 })
1482 }
1483 }
1484 case "WHO":
1485 if len(msg.Params) == 0 {
1486 // TODO: support WHO without parameters
1487 dc.SendMessage(&irc.Message{
1488 Prefix: dc.srv.prefix(),
1489 Command: irc.RPL_ENDOFWHO,
1490 Params: []string{dc.nick, "*", "End of /WHO list"},
1491 })
1492 return nil
1493 }
1494
1495 // TODO: support WHO masks
1496 entity := msg.Params[0]
1497
1498 if entity == dc.nick {
1499 // TODO: support AWAY (H/G) in self WHO reply
1500 dc.SendMessage(&irc.Message{
1501 Prefix: dc.srv.prefix(),
1502 Command: irc.RPL_WHOREPLY,
1503 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1504 })
1505 dc.SendMessage(&irc.Message{
1506 Prefix: dc.srv.prefix(),
1507 Command: irc.RPL_ENDOFWHO,
1508 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1509 })
1510 return nil
1511 }
1512 if entity == serviceNick {
1513 dc.SendMessage(&irc.Message{
1514 Prefix: dc.srv.prefix(),
1515 Command: irc.RPL_WHOREPLY,
1516 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1517 })
1518 dc.SendMessage(&irc.Message{
1519 Prefix: dc.srv.prefix(),
1520 Command: irc.RPL_ENDOFWHO,
1521 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1522 })
1523 return nil
1524 }
1525
1526 uc, upstreamName, err := dc.unmarshalEntity(entity)
1527 if err != nil {
1528 return err
1529 }
1530
1531 var params []string
1532 if len(msg.Params) == 2 {
1533 params = []string{upstreamName, msg.Params[1]}
1534 } else {
1535 params = []string{upstreamName}
1536 }
1537
1538 uc.SendMessageLabeled(dc.id, &irc.Message{
1539 Command: "WHO",
1540 Params: params,
1541 })
1542 case "WHOIS":
1543 if len(msg.Params) == 0 {
1544 return ircError{&irc.Message{
1545 Command: irc.ERR_NONICKNAMEGIVEN,
1546 Params: []string{dc.nick, "No nickname given"},
1547 }}
1548 }
1549
1550 var target, mask string
1551 if len(msg.Params) == 1 {
1552 target = ""
1553 mask = msg.Params[0]
1554 } else {
1555 target = msg.Params[0]
1556 mask = msg.Params[1]
1557 }
1558 // TODO: support multiple WHOIS users
1559 if i := strings.IndexByte(mask, ','); i >= 0 {
1560 mask = mask[:i]
1561 }
1562
1563 if mask == dc.nick {
1564 dc.SendMessage(&irc.Message{
1565 Prefix: dc.srv.prefix(),
1566 Command: irc.RPL_WHOISUSER,
1567 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1568 })
1569 dc.SendMessage(&irc.Message{
1570 Prefix: dc.srv.prefix(),
1571 Command: irc.RPL_WHOISSERVER,
1572 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1573 })
1574 dc.SendMessage(&irc.Message{
1575 Prefix: dc.srv.prefix(),
1576 Command: irc.RPL_ENDOFWHOIS,
1577 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1578 })
1579 return nil
1580 }
1581
1582 // TODO: support WHOIS masks
1583 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1584 if err != nil {
1585 return err
1586 }
1587
1588 var params []string
1589 if target != "" {
1590 if target == mask { // WHOIS nick nick
1591 params = []string{upstreamNick, upstreamNick}
1592 } else {
1593 params = []string{target, upstreamNick}
1594 }
1595 } else {
1596 params = []string{upstreamNick}
1597 }
1598
1599 uc.SendMessageLabeled(dc.id, &irc.Message{
1600 Command: "WHOIS",
1601 Params: params,
1602 })
1603 case "PRIVMSG":
1604 var targetsStr, text string
1605 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1606 return err
1607 }
1608 tags := copyClientTags(msg.Tags)
1609
1610 for _, name := range strings.Split(targetsStr, ",") {
1611 if name == serviceNick {
1612 if dc.caps["echo-message"] {
1613 echoTags := tags.Copy()
1614 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1615 dc.SendMessage(&irc.Message{
1616 Tags: echoTags,
1617 Prefix: dc.prefix(),
1618 Command: "PRIVMSG",
1619 Params: []string{name, text},
1620 })
1621 }
1622 handleServicePRIVMSG(dc, text)
1623 continue
1624 }
1625
1626 uc, upstreamName, err := dc.unmarshalEntity(name)
1627 if err != nil {
1628 return err
1629 }
1630
1631 if upstreamName == "NickServ" {
1632 dc.handleNickServPRIVMSG(uc, text)
1633 }
1634
1635 unmarshaledText := text
1636 if uc.isChannel(upstreamName) {
1637 unmarshaledText = dc.unmarshalText(uc, text)
1638 }
1639 uc.SendMessageLabeled(dc.id, &irc.Message{
1640 Tags: tags,
1641 Command: "PRIVMSG",
1642 Params: []string{upstreamName, unmarshaledText},
1643 })
1644
1645 echoTags := tags.Copy()
1646 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1647 echoMsg := &irc.Message{
1648 Tags: echoTags,
1649 Prefix: &irc.Prefix{
1650 Name: uc.nick,
1651 User: uc.username,
1652 },
1653 Command: "PRIVMSG",
1654 Params: []string{upstreamName, text},
1655 }
1656 uc.produce(upstreamName, echoMsg, dc)
1657
1658 uc.updateChannelAutoDetach(upstreamName)
1659 }
1660 case "NOTICE":
1661 var targetsStr, text string
1662 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1663 return err
1664 }
1665 tags := copyClientTags(msg.Tags)
1666
1667 for _, name := range strings.Split(targetsStr, ",") {
1668 uc, upstreamName, err := dc.unmarshalEntity(name)
1669 if err != nil {
1670 return err
1671 }
1672
1673 unmarshaledText := text
1674 if uc.isChannel(upstreamName) {
1675 unmarshaledText = dc.unmarshalText(uc, text)
1676 }
1677 uc.SendMessageLabeled(dc.id, &irc.Message{
1678 Tags: tags,
1679 Command: "NOTICE",
1680 Params: []string{upstreamName, unmarshaledText},
1681 })
1682
1683 uc.updateChannelAutoDetach(upstreamName)
1684 }
1685 case "TAGMSG":
1686 var targetsStr string
1687 if err := parseMessageParams(msg, &targetsStr); err != nil {
1688 return err
1689 }
1690 tags := copyClientTags(msg.Tags)
1691
1692 for _, name := range strings.Split(targetsStr, ",") {
1693 uc, upstreamName, err := dc.unmarshalEntity(name)
1694 if err != nil {
1695 return err
1696 }
1697 if _, ok := uc.caps["message-tags"]; !ok {
1698 continue
1699 }
1700
1701 uc.SendMessageLabeled(dc.id, &irc.Message{
1702 Tags: tags,
1703 Command: "TAGMSG",
1704 Params: []string{upstreamName},
1705 })
1706
1707 uc.updateChannelAutoDetach(upstreamName)
1708 }
1709 case "INVITE":
1710 var user, channel string
1711 if err := parseMessageParams(msg, &user, &channel); err != nil {
1712 return err
1713 }
1714
1715 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1716 if err != nil {
1717 return err
1718 }
1719
1720 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1721 if err != nil {
1722 return err
1723 }
1724
1725 if ucChannel != ucUser {
1726 return ircError{&irc.Message{
1727 Command: irc.ERR_USERNOTINCHANNEL,
1728 Params: []string{dc.nick, user, channel, "They are on another network"},
1729 }}
1730 }
1731 uc := ucChannel
1732
1733 uc.SendMessageLabeled(dc.id, &irc.Message{
1734 Command: "INVITE",
1735 Params: []string{upstreamUser, upstreamChannel},
1736 })
1737 case "CHATHISTORY":
1738 var subcommand string
1739 if err := parseMessageParams(msg, &subcommand); err != nil {
1740 return err
1741 }
1742 var target, criteria, limitStr string
1743 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1744 return ircError{&irc.Message{
1745 Command: "FAIL",
1746 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1747 }}
1748 }
1749
1750 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1751 if !ok {
1752 return ircError{&irc.Message{
1753 Command: irc.ERR_UNKNOWNCOMMAND,
1754 Params: []string{dc.nick, subcommand, "Unknown command"},
1755 }}
1756 }
1757
1758 uc, entity, err := dc.unmarshalEntity(target)
1759 if err != nil {
1760 return err
1761 }
1762
1763 // TODO: support msgid criteria
1764 criteriaParts := strings.SplitN(criteria, "=", 2)
1765 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1766 return ircError{&irc.Message{
1767 Command: "FAIL",
1768 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1769 }}
1770 }
1771
1772 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1773 if err != nil {
1774 return ircError{&irc.Message{
1775 Command: "FAIL",
1776 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1777 }}
1778 }
1779
1780 limit, err := strconv.Atoi(limitStr)
1781 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1782 return ircError{&irc.Message{
1783 Command: "FAIL",
1784 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1785 }}
1786 }
1787
1788 var history []*irc.Message
1789 switch subcommand {
1790 case "BEFORE":
1791 history, err = store.LoadBeforeTime(uc.network, entity, timestamp, limit)
1792 case "AFTER":
1793 history, err = store.LoadAfterTime(uc.network, entity, timestamp, limit)
1794 default:
1795 // TODO: support LATEST, BETWEEN
1796 return ircError{&irc.Message{
1797 Command: "FAIL",
1798 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1799 }}
1800 }
1801 if err != nil {
1802 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1803 return newChatHistoryError(subcommand, target)
1804 }
1805
1806 batchRef := "history"
1807 dc.SendMessage(&irc.Message{
1808 Prefix: dc.srv.prefix(),
1809 Command: "BATCH",
1810 Params: []string{"+" + batchRef, "chathistory", target},
1811 })
1812
1813 for _, msg := range history {
1814 msg.Tags["batch"] = irc.TagValue(batchRef)
1815 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1816 }
1817
1818 dc.SendMessage(&irc.Message{
1819 Prefix: dc.srv.prefix(),
1820 Command: "BATCH",
1821 Params: []string{"-" + batchRef},
1822 })
1823 default:
1824 dc.logger.Printf("unhandled message: %v", msg)
1825 return newUnknownCommandError(msg.Command)
1826 }
1827 return nil
1828}
1829
1830func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1831 username, password, ok := parseNickServCredentials(text, uc.nick)
1832 if !ok {
1833 return
1834 }
1835
1836 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1837 // automatically erase the key pair or any other credentials.
1838 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1839 return
1840 }
1841
1842 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1843 n := uc.network
1844 n.SASL.Mechanism = "PLAIN"
1845 n.SASL.Plain.Username = username
1846 n.SASL.Plain.Password = password
1847 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1848 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1849 }
1850}
1851
1852func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1853 fields := strings.Fields(text)
1854 if len(fields) < 2 {
1855 return "", "", false
1856 }
1857 cmd := strings.ToUpper(fields[0])
1858 params := fields[1:]
1859 switch cmd {
1860 case "REGISTER":
1861 username = nick
1862 password = params[0]
1863 case "IDENTIFY":
1864 if len(params) == 1 {
1865 username = nick
1866 password = params[0]
1867 } else {
1868 username = params[0]
1869 password = params[1]
1870 }
1871 case "SET":
1872 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1873 username = nick
1874 password = params[1]
1875 }
1876 default:
1877 return "", "", false
1878 }
1879 return username, password, true
1880}
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