source: code/trunk/downstream.go@ 435

Last change on this file since 435 was 435, checked in by delthas, 4 years ago

Add customizable auto-detaching, auto-reattaching, relaying.

This uses the fields added previously to the Channel struct to implement
the actual detaching/reattaching/relaying logic.

The FilterDefault values of the messages filters are currently
hardcoded.

The values of the message filters are not currently user-settable.

This introduces a new user event, eventChannelDetach, which stores an
upstreamConn (which might become invalid at the time of processing), and
a channel name, used for auto-detaching. Every time the channel detach
timer is refreshed (by receveing a message, etc.), a new timer is
created on the upstreamChannel, which will dispatch this event after the
duration (and discards the previous timer, if any).
File size: 45.1 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 netName, 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.getNetwork(netName)
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
559 caps := make([]string, 0, len(dc.supportedCaps))
560 for k, v := range dc.supportedCaps {
561 if dc.capVersion >= 302 && v != "" {
562 caps = append(caps, k+"="+v)
563 } else {
564 caps = append(caps, k)
565 }
566 }
567
568 // TODO: multi-line replies
569 dc.SendMessage(&irc.Message{
570 Prefix: dc.srv.prefix(),
571 Command: "CAP",
572 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
573 })
574
575 if dc.capVersion >= 302 {
576 // CAP version 302 implicitly enables cap-notify
577 dc.caps["cap-notify"] = true
578 }
579
580 if !dc.registered {
581 dc.negociatingCaps = true
582 }
583 case "LIST":
584 var caps []string
585 for name := range dc.caps {
586 caps = append(caps, name)
587 }
588
589 // TODO: multi-line replies
590 dc.SendMessage(&irc.Message{
591 Prefix: dc.srv.prefix(),
592 Command: "CAP",
593 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
594 })
595 case "REQ":
596 if len(args) == 0 {
597 return ircError{&irc.Message{
598 Command: err_invalidcapcmd,
599 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
600 }}
601 }
602
603 // TODO: atomically ack/nak the whole capability set
604 caps := strings.Fields(args[0])
605 ack := true
606 for _, name := range caps {
607 name = strings.ToLower(name)
608 enable := !strings.HasPrefix(name, "-")
609 if !enable {
610 name = strings.TrimPrefix(name, "-")
611 }
612
613 if enable == dc.caps[name] {
614 continue
615 }
616
617 _, ok := dc.supportedCaps[name]
618 if !ok {
619 ack = false
620 break
621 }
622
623 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
624 // cap-notify cannot be disabled with CAP version 302
625 ack = false
626 break
627 }
628
629 dc.caps[name] = enable
630 }
631
632 reply := "NAK"
633 if ack {
634 reply = "ACK"
635 }
636 dc.SendMessage(&irc.Message{
637 Prefix: dc.srv.prefix(),
638 Command: "CAP",
639 Params: []string{replyTo, reply, args[0]},
640 })
641 case "END":
642 dc.negociatingCaps = false
643 default:
644 return ircError{&irc.Message{
645 Command: err_invalidcapcmd,
646 Params: []string{replyTo, cmd, "Unknown CAP command"},
647 }}
648 }
649 return nil
650}
651
652func (dc *downstreamConn) setSupportedCap(name, value string) {
653 prevValue, hasPrev := dc.supportedCaps[name]
654 changed := !hasPrev || prevValue != value
655 dc.supportedCaps[name] = value
656
657 if !dc.caps["cap-notify"] || !changed {
658 return
659 }
660
661 replyTo := dc.nick
662 if !dc.registered {
663 replyTo = "*"
664 }
665
666 cap := name
667 if value != "" && dc.capVersion >= 302 {
668 cap = name + "=" + value
669 }
670
671 dc.SendMessage(&irc.Message{
672 Prefix: dc.srv.prefix(),
673 Command: "CAP",
674 Params: []string{replyTo, "NEW", cap},
675 })
676}
677
678func (dc *downstreamConn) unsetSupportedCap(name string) {
679 _, hasPrev := dc.supportedCaps[name]
680 delete(dc.supportedCaps, name)
681 delete(dc.caps, name)
682
683 if !dc.caps["cap-notify"] || !hasPrev {
684 return
685 }
686
687 replyTo := dc.nick
688 if !dc.registered {
689 replyTo = "*"
690 }
691
692 dc.SendMessage(&irc.Message{
693 Prefix: dc.srv.prefix(),
694 Command: "CAP",
695 Params: []string{replyTo, "DEL", name},
696 })
697}
698
699func (dc *downstreamConn) updateSupportedCaps() {
700 supportedCaps := make(map[string]bool)
701 for cap := range needAllDownstreamCaps {
702 supportedCaps[cap] = true
703 }
704 dc.forEachUpstream(func(uc *upstreamConn) {
705 for cap, supported := range supportedCaps {
706 supportedCaps[cap] = supported && uc.caps[cap]
707 }
708 })
709
710 for cap, supported := range supportedCaps {
711 if supported {
712 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
713 } else {
714 dc.unsetSupportedCap(cap)
715 }
716 }
717}
718
719func (dc *downstreamConn) updateNick() {
720 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
721 dc.SendMessage(&irc.Message{
722 Prefix: dc.prefix(),
723 Command: "NICK",
724 Params: []string{uc.nick},
725 })
726 dc.nick = uc.nick
727 }
728}
729
730func sanityCheckServer(addr string) error {
731 dialer := net.Dialer{Timeout: 30 * time.Second}
732 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
733 if err != nil {
734 return err
735 }
736 return conn.Close()
737}
738
739func unmarshalUsername(rawUsername string) (username, client, network string) {
740 username = rawUsername
741
742 i := strings.IndexAny(username, "/@")
743 j := strings.LastIndexAny(username, "/@")
744 if i >= 0 {
745 username = rawUsername[:i]
746 }
747 if j >= 0 {
748 if rawUsername[j] == '@' {
749 client = rawUsername[j+1:]
750 } else {
751 network = rawUsername[j+1:]
752 }
753 }
754 if i >= 0 && j >= 0 && i < j {
755 if rawUsername[i] == '@' {
756 client = rawUsername[i+1 : j]
757 } else {
758 network = rawUsername[i+1 : j]
759 }
760 }
761
762 return username, client, network
763}
764
765func (dc *downstreamConn) authenticate(username, password string) error {
766 username, clientName, networkName := unmarshalUsername(username)
767
768 u, err := dc.srv.db.GetUser(username)
769 if err != nil {
770 dc.logger.Printf("failed authentication for %q: %v", username, err)
771 return errAuthFailed
772 }
773
774 // Password auth disabled
775 if u.Password == "" {
776 return errAuthFailed
777 }
778
779 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
780 if err != nil {
781 dc.logger.Printf("failed authentication for %q: %v", username, err)
782 return errAuthFailed
783 }
784
785 dc.user = dc.srv.getUser(username)
786 if dc.user == nil {
787 dc.logger.Printf("failed authentication for %q: user not active", username)
788 return errAuthFailed
789 }
790 dc.clientName = clientName
791 dc.networkName = networkName
792 return nil
793}
794
795func (dc *downstreamConn) register() error {
796 if dc.registered {
797 return fmt.Errorf("tried to register twice")
798 }
799
800 password := dc.password
801 dc.password = ""
802 if dc.user == nil {
803 if err := dc.authenticate(dc.rawUsername, password); err != nil {
804 return err
805 }
806 }
807
808 if dc.clientName == "" && dc.networkName == "" {
809 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
810 }
811
812 dc.registered = true
813 dc.logger.Printf("registration complete for user %q", dc.user.Username)
814 return nil
815}
816
817func (dc *downstreamConn) loadNetwork() error {
818 if dc.networkName == "" {
819 return nil
820 }
821
822 network := dc.user.getNetwork(dc.networkName)
823 if network == nil {
824 addr := dc.networkName
825 if !strings.ContainsRune(addr, ':') {
826 addr = addr + ":6697"
827 }
828
829 dc.logger.Printf("trying to connect to new network %q", addr)
830 if err := sanityCheckServer(addr); err != nil {
831 dc.logger.Printf("failed to connect to %q: %v", addr, err)
832 return ircError{&irc.Message{
833 Command: irc.ERR_PASSWDMISMATCH,
834 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
835 }}
836 }
837
838 // Some clients only allow specifying the nickname (and use the
839 // nickname as a username too). Strip the network name from the
840 // nickname when auto-saving networks.
841 nick, _, _ := unmarshalUsername(dc.nick)
842
843 dc.logger.Printf("auto-saving network %q", dc.networkName)
844 var err error
845 network, err = dc.user.createNetwork(&Network{
846 Addr: dc.networkName,
847 Nick: nick,
848 })
849 if err != nil {
850 return err
851 }
852 }
853
854 dc.network = network
855 return nil
856}
857
858func (dc *downstreamConn) welcome() error {
859 if dc.user == nil || !dc.registered {
860 panic("tried to welcome an unregistered connection")
861 }
862
863 // TODO: doing this might take some time. We should do it in dc.register
864 // instead, but we'll potentially be adding a new network and this must be
865 // done in the user goroutine.
866 if err := dc.loadNetwork(); err != nil {
867 return err
868 }
869
870 dc.SendMessage(&irc.Message{
871 Prefix: dc.srv.prefix(),
872 Command: irc.RPL_WELCOME,
873 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
874 })
875 dc.SendMessage(&irc.Message{
876 Prefix: dc.srv.prefix(),
877 Command: irc.RPL_YOURHOST,
878 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
879 })
880 dc.SendMessage(&irc.Message{
881 Prefix: dc.srv.prefix(),
882 Command: irc.RPL_CREATED,
883 Params: []string{dc.nick, "Who cares when the server was created?"},
884 })
885 dc.SendMessage(&irc.Message{
886 Prefix: dc.srv.prefix(),
887 Command: irc.RPL_MYINFO,
888 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
889 })
890 // TODO: RPL_ISUPPORT
891 // TODO: send CHATHISTORY in RPL_ISUPPORT when implemented
892 dc.SendMessage(&irc.Message{
893 Prefix: dc.srv.prefix(),
894 Command: irc.ERR_NOMOTD,
895 Params: []string{dc.nick, "No MOTD"},
896 })
897
898 dc.updateNick()
899
900 dc.forEachUpstream(func(uc *upstreamConn) {
901 for _, ch := range uc.channels {
902 if !ch.complete {
903 continue
904 }
905 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
906 continue
907 }
908
909 dc.SendMessage(&irc.Message{
910 Prefix: dc.prefix(),
911 Command: "JOIN",
912 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
913 })
914
915 forwardChannel(dc, ch)
916 }
917 })
918
919 dc.forEachNetwork(func(net *network) {
920 // Only send history if we're the first connected client with that name
921 // for the network
922 if _, ok := net.offlineClients[dc.clientName]; ok {
923 dc.sendNetworkHistory(net)
924 delete(net.offlineClients, dc.clientName)
925 }
926
927 // Fast-forward history to last message
928 for target, history := range net.history {
929 if ch, ok := net.channels[target]; ok && ch.Detached {
930 continue
931 }
932
933 lastID, err := dc.user.msgStore.LastMsgID(net, target, time.Now())
934 if err != nil {
935 dc.logger.Printf("failed to get last message ID: %v", err)
936 continue
937 }
938 history.clients[dc.clientName] = lastID
939 }
940 })
941
942 return nil
943}
944
945// messageSupportsHistory checks whether the provided message can be sent as
946// part of an history batch.
947func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
948 // Don't replay all messages, because that would mess up client
949 // state. For instance we just sent the list of users, sending
950 // PART messages for one of these users would be incorrect.
951 // TODO: add support for draft/event-playback
952 switch msg.Command {
953 case "PRIVMSG", "NOTICE":
954 return true
955 }
956 return false
957}
958
959func (dc *downstreamConn) sendNetworkHistory(net *network) {
960 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
961 return
962 }
963 for target, history := range net.history {
964 if ch, ok := net.channels[target]; ok && ch.Detached {
965 continue
966 }
967
968 lastDelivered, ok := history.clients[dc.clientName]
969 if !ok {
970 continue
971 }
972
973 limit := 4000
974 history, err := dc.user.msgStore.LoadLatestID(net, target, lastDelivered, limit)
975 if err != nil {
976 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
977 continue
978 }
979
980 batchRef := "history"
981 if dc.caps["batch"] {
982 dc.SendMessage(&irc.Message{
983 Prefix: dc.srv.prefix(),
984 Command: "BATCH",
985 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
986 })
987 }
988
989 for _, msg := range history {
990 if !dc.messageSupportsHistory(msg) {
991 continue
992 }
993
994 if dc.caps["batch"] {
995 msg.Tags["batch"] = irc.TagValue(batchRef)
996 }
997 dc.SendMessage(dc.marshalMessage(msg, net))
998 }
999
1000 if dc.caps["batch"] {
1001 dc.SendMessage(&irc.Message{
1002 Prefix: dc.srv.prefix(),
1003 Command: "BATCH",
1004 Params: []string{"-" + batchRef},
1005 })
1006 }
1007 }
1008}
1009
1010func (dc *downstreamConn) runUntilRegistered() error {
1011 for !dc.registered {
1012 msg, err := dc.ReadMessage()
1013 if err != nil {
1014 return fmt.Errorf("failed to read IRC command: %v", err)
1015 }
1016
1017 err = dc.handleMessage(msg)
1018 if ircErr, ok := err.(ircError); ok {
1019 ircErr.Message.Prefix = dc.srv.prefix()
1020 dc.SendMessage(ircErr.Message)
1021 } else if err != nil {
1022 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1023 }
1024 }
1025
1026 return nil
1027}
1028
1029func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1030 switch msg.Command {
1031 case "CAP":
1032 var subCmd string
1033 if err := parseMessageParams(msg, &subCmd); err != nil {
1034 return err
1035 }
1036 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1037 return err
1038 }
1039 case "PING":
1040 var source, destination string
1041 if err := parseMessageParams(msg, &source); err != nil {
1042 return err
1043 }
1044 if len(msg.Params) > 1 {
1045 destination = msg.Params[1]
1046 }
1047 if destination != "" && destination != dc.srv.Hostname {
1048 return ircError{&irc.Message{
1049 Command: irc.ERR_NOSUCHSERVER,
1050 Params: []string{dc.nick, destination, "No such server"},
1051 }}
1052 }
1053 dc.SendMessage(&irc.Message{
1054 Prefix: dc.srv.prefix(),
1055 Command: "PONG",
1056 Params: []string{dc.srv.Hostname, source},
1057 })
1058 return nil
1059 case "PONG":
1060 if len(msg.Params) == 0 {
1061 return newNeedMoreParamsError(msg.Command)
1062 }
1063 token := msg.Params[len(msg.Params)-1]
1064 dc.handlePong(token)
1065 case "USER":
1066 return ircError{&irc.Message{
1067 Command: irc.ERR_ALREADYREGISTERED,
1068 Params: []string{dc.nick, "You may not reregister"},
1069 }}
1070 case "NICK":
1071 var rawNick string
1072 if err := parseMessageParams(msg, &rawNick); err != nil {
1073 return err
1074 }
1075
1076 nick := rawNick
1077 var upstream *upstreamConn
1078 if dc.upstream() == nil {
1079 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1080 if err == nil { // NICK nick/network: NICK only on a specific upstream
1081 upstream = uc
1082 nick = unmarshaledNick
1083 }
1084 }
1085
1086 if strings.ContainsAny(nick, illegalNickChars) {
1087 return ircError{&irc.Message{
1088 Command: irc.ERR_ERRONEUSNICKNAME,
1089 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1090 }}
1091 }
1092 if nick == serviceNick {
1093 return ircError{&irc.Message{
1094 Command: irc.ERR_NICKNAMEINUSE,
1095 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1096 }}
1097 }
1098
1099 var err error
1100 dc.forEachNetwork(func(n *network) {
1101 if err != nil || (upstream != nil && upstream.network != n) {
1102 return
1103 }
1104 n.Nick = nick
1105 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1106 })
1107 if err != nil {
1108 return err
1109 }
1110
1111 dc.forEachUpstream(func(uc *upstreamConn) {
1112 if upstream != nil && upstream != uc {
1113 return
1114 }
1115 uc.SendMessageLabeled(dc.id, &irc.Message{
1116 Command: "NICK",
1117 Params: []string{nick},
1118 })
1119 })
1120
1121 if dc.upstream() == nil && dc.nick != nick {
1122 dc.SendMessage(&irc.Message{
1123 Prefix: dc.prefix(),
1124 Command: "NICK",
1125 Params: []string{nick},
1126 })
1127 dc.nick = nick
1128 }
1129 case "JOIN":
1130 var namesStr string
1131 if err := parseMessageParams(msg, &namesStr); err != nil {
1132 return err
1133 }
1134
1135 var keys []string
1136 if len(msg.Params) > 1 {
1137 keys = strings.Split(msg.Params[1], ",")
1138 }
1139
1140 for i, name := range strings.Split(namesStr, ",") {
1141 uc, upstreamName, err := dc.unmarshalEntity(name)
1142 if err != nil {
1143 return err
1144 }
1145
1146 var key string
1147 if len(keys) > i {
1148 key = keys[i]
1149 }
1150
1151 params := []string{upstreamName}
1152 if key != "" {
1153 params = append(params, key)
1154 }
1155 uc.SendMessageLabeled(dc.id, &irc.Message{
1156 Command: "JOIN",
1157 Params: params,
1158 })
1159
1160 var ch *Channel
1161 var ok bool
1162 if ch, ok = uc.network.channels[upstreamName]; ok {
1163 // Don't clear the channel key if there's one set
1164 // TODO: add a way to unset the channel key
1165 if key != "" {
1166 ch.Key = key
1167 }
1168 uc.network.attach(ch)
1169 } else {
1170 ch = &Channel{
1171 Name: upstreamName,
1172 Key: key,
1173 }
1174 uc.network.channels[upstreamName] = ch
1175 }
1176 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1177 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1178 }
1179 }
1180 case "PART":
1181 var namesStr string
1182 if err := parseMessageParams(msg, &namesStr); err != nil {
1183 return err
1184 }
1185
1186 var reason string
1187 if len(msg.Params) > 1 {
1188 reason = msg.Params[1]
1189 }
1190
1191 for _, name := range strings.Split(namesStr, ",") {
1192 uc, upstreamName, err := dc.unmarshalEntity(name)
1193 if err != nil {
1194 return err
1195 }
1196
1197 if strings.EqualFold(reason, "detach") {
1198 var ch *Channel
1199 var ok bool
1200 if ch, ok = uc.network.channels[upstreamName]; ok {
1201 uc.network.detach(ch)
1202 } else {
1203 ch = &Channel{
1204 Name: name,
1205 Detached: true,
1206 }
1207 uc.network.channels[upstreamName] = ch
1208 }
1209 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1210 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1211 }
1212 } else {
1213 params := []string{upstreamName}
1214 if reason != "" {
1215 params = append(params, reason)
1216 }
1217 uc.SendMessageLabeled(dc.id, &irc.Message{
1218 Command: "PART",
1219 Params: params,
1220 })
1221
1222 if err := uc.network.deleteChannel(upstreamName); err != nil {
1223 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1224 }
1225 }
1226 }
1227 case "KICK":
1228 var channelStr, userStr string
1229 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1230 return err
1231 }
1232
1233 channels := strings.Split(channelStr, ",")
1234 users := strings.Split(userStr, ",")
1235
1236 var reason string
1237 if len(msg.Params) > 2 {
1238 reason = msg.Params[2]
1239 }
1240
1241 if len(channels) != 1 && len(channels) != len(users) {
1242 return ircError{&irc.Message{
1243 Command: irc.ERR_BADCHANMASK,
1244 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1245 }}
1246 }
1247
1248 for i, user := range users {
1249 var channel string
1250 if len(channels) == 1 {
1251 channel = channels[0]
1252 } else {
1253 channel = channels[i]
1254 }
1255
1256 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1257 if err != nil {
1258 return err
1259 }
1260
1261 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1262 if err != nil {
1263 return err
1264 }
1265
1266 if ucChannel != ucUser {
1267 return ircError{&irc.Message{
1268 Command: irc.ERR_USERNOTINCHANNEL,
1269 Params: []string{dc.nick, user, channel, "They are on another network"},
1270 }}
1271 }
1272 uc := ucChannel
1273
1274 params := []string{upstreamChannel, upstreamUser}
1275 if reason != "" {
1276 params = append(params, reason)
1277 }
1278 uc.SendMessageLabeled(dc.id, &irc.Message{
1279 Command: "KICK",
1280 Params: params,
1281 })
1282 }
1283 case "MODE":
1284 var name string
1285 if err := parseMessageParams(msg, &name); err != nil {
1286 return err
1287 }
1288
1289 var modeStr string
1290 if len(msg.Params) > 1 {
1291 modeStr = msg.Params[1]
1292 }
1293
1294 if name == dc.nick {
1295 if modeStr != "" {
1296 dc.forEachUpstream(func(uc *upstreamConn) {
1297 uc.SendMessageLabeled(dc.id, &irc.Message{
1298 Command: "MODE",
1299 Params: []string{uc.nick, modeStr},
1300 })
1301 })
1302 } else {
1303 dc.SendMessage(&irc.Message{
1304 Prefix: dc.srv.prefix(),
1305 Command: irc.RPL_UMODEIS,
1306 Params: []string{dc.nick, ""}, // TODO
1307 })
1308 }
1309 return nil
1310 }
1311
1312 uc, upstreamName, err := dc.unmarshalEntity(name)
1313 if err != nil {
1314 return err
1315 }
1316
1317 if !uc.isChannel(upstreamName) {
1318 return ircError{&irc.Message{
1319 Command: irc.ERR_USERSDONTMATCH,
1320 Params: []string{dc.nick, "Cannot change mode for other users"},
1321 }}
1322 }
1323
1324 if modeStr != "" {
1325 params := []string{upstreamName, modeStr}
1326 params = append(params, msg.Params[2:]...)
1327 uc.SendMessageLabeled(dc.id, &irc.Message{
1328 Command: "MODE",
1329 Params: params,
1330 })
1331 } else {
1332 ch, ok := uc.channels[upstreamName]
1333 if !ok {
1334 return ircError{&irc.Message{
1335 Command: irc.ERR_NOSUCHCHANNEL,
1336 Params: []string{dc.nick, name, "No such channel"},
1337 }}
1338 }
1339
1340 if ch.modes == nil {
1341 // we haven't received the initial RPL_CHANNELMODEIS yet
1342 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1343 return nil
1344 }
1345
1346 modeStr, modeParams := ch.modes.Format()
1347 params := []string{dc.nick, name, modeStr}
1348 params = append(params, modeParams...)
1349
1350 dc.SendMessage(&irc.Message{
1351 Prefix: dc.srv.prefix(),
1352 Command: irc.RPL_CHANNELMODEIS,
1353 Params: params,
1354 })
1355 if ch.creationTime != "" {
1356 dc.SendMessage(&irc.Message{
1357 Prefix: dc.srv.prefix(),
1358 Command: rpl_creationtime,
1359 Params: []string{dc.nick, name, ch.creationTime},
1360 })
1361 }
1362 }
1363 case "TOPIC":
1364 var channel string
1365 if err := parseMessageParams(msg, &channel); err != nil {
1366 return err
1367 }
1368
1369 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1370 if err != nil {
1371 return err
1372 }
1373
1374 if len(msg.Params) > 1 { // setting topic
1375 topic := msg.Params[1]
1376 uc.SendMessageLabeled(dc.id, &irc.Message{
1377 Command: "TOPIC",
1378 Params: []string{upstreamChannel, topic},
1379 })
1380 } else { // getting topic
1381 ch, ok := uc.channels[upstreamChannel]
1382 if !ok {
1383 return ircError{&irc.Message{
1384 Command: irc.ERR_NOSUCHCHANNEL,
1385 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1386 }}
1387 }
1388 sendTopic(dc, ch)
1389 }
1390 case "LIST":
1391 // TODO: support ELIST when supported by all upstreams
1392
1393 pl := pendingLIST{
1394 downstreamID: dc.id,
1395 pendingCommands: make(map[int64]*irc.Message),
1396 }
1397 var upstream *upstreamConn
1398 var upstreamChannels map[int64][]string
1399 if len(msg.Params) > 0 {
1400 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1401 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1402 upstream = uc
1403 } else {
1404 upstreamChannels = make(map[int64][]string)
1405 channels := strings.Split(msg.Params[0], ",")
1406 for _, channel := range channels {
1407 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1408 if err != nil {
1409 return err
1410 }
1411 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1412 }
1413 }
1414 }
1415
1416 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1417 dc.forEachUpstream(func(uc *upstreamConn) {
1418 if upstream != nil && upstream != uc {
1419 return
1420 }
1421 var params []string
1422 if upstreamChannels != nil {
1423 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1424 params = []string{strings.Join(channels, ",")}
1425 } else {
1426 return
1427 }
1428 }
1429 pl.pendingCommands[uc.network.ID] = &irc.Message{
1430 Command: "LIST",
1431 Params: params,
1432 }
1433 uc.trySendLIST(dc.id)
1434 })
1435 case "NAMES":
1436 if len(msg.Params) == 0 {
1437 dc.SendMessage(&irc.Message{
1438 Prefix: dc.srv.prefix(),
1439 Command: irc.RPL_ENDOFNAMES,
1440 Params: []string{dc.nick, "*", "End of /NAMES list"},
1441 })
1442 return nil
1443 }
1444
1445 channels := strings.Split(msg.Params[0], ",")
1446 for _, channel := range channels {
1447 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1448 if err != nil {
1449 return err
1450 }
1451
1452 ch, ok := uc.channels[upstreamChannel]
1453 if ok {
1454 sendNames(dc, ch)
1455 } else {
1456 // NAMES on a channel we have not joined, ask upstream
1457 uc.SendMessageLabeled(dc.id, &irc.Message{
1458 Command: "NAMES",
1459 Params: []string{upstreamChannel},
1460 })
1461 }
1462 }
1463 case "WHO":
1464 if len(msg.Params) == 0 {
1465 // TODO: support WHO without parameters
1466 dc.SendMessage(&irc.Message{
1467 Prefix: dc.srv.prefix(),
1468 Command: irc.RPL_ENDOFWHO,
1469 Params: []string{dc.nick, "*", "End of /WHO list"},
1470 })
1471 return nil
1472 }
1473
1474 // TODO: support WHO masks
1475 entity := msg.Params[0]
1476
1477 if entity == dc.nick {
1478 // TODO: support AWAY (H/G) in self WHO reply
1479 dc.SendMessage(&irc.Message{
1480 Prefix: dc.srv.prefix(),
1481 Command: irc.RPL_WHOREPLY,
1482 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1483 })
1484 dc.SendMessage(&irc.Message{
1485 Prefix: dc.srv.prefix(),
1486 Command: irc.RPL_ENDOFWHO,
1487 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1488 })
1489 return nil
1490 }
1491 if entity == serviceNick {
1492 dc.SendMessage(&irc.Message{
1493 Prefix: dc.srv.prefix(),
1494 Command: irc.RPL_WHOREPLY,
1495 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1496 })
1497 dc.SendMessage(&irc.Message{
1498 Prefix: dc.srv.prefix(),
1499 Command: irc.RPL_ENDOFWHO,
1500 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1501 })
1502 return nil
1503 }
1504
1505 uc, upstreamName, err := dc.unmarshalEntity(entity)
1506 if err != nil {
1507 return err
1508 }
1509
1510 var params []string
1511 if len(msg.Params) == 2 {
1512 params = []string{upstreamName, msg.Params[1]}
1513 } else {
1514 params = []string{upstreamName}
1515 }
1516
1517 uc.SendMessageLabeled(dc.id, &irc.Message{
1518 Command: "WHO",
1519 Params: params,
1520 })
1521 case "WHOIS":
1522 if len(msg.Params) == 0 {
1523 return ircError{&irc.Message{
1524 Command: irc.ERR_NONICKNAMEGIVEN,
1525 Params: []string{dc.nick, "No nickname given"},
1526 }}
1527 }
1528
1529 var target, mask string
1530 if len(msg.Params) == 1 {
1531 target = ""
1532 mask = msg.Params[0]
1533 } else {
1534 target = msg.Params[0]
1535 mask = msg.Params[1]
1536 }
1537 // TODO: support multiple WHOIS users
1538 if i := strings.IndexByte(mask, ','); i >= 0 {
1539 mask = mask[:i]
1540 }
1541
1542 if mask == dc.nick {
1543 dc.SendMessage(&irc.Message{
1544 Prefix: dc.srv.prefix(),
1545 Command: irc.RPL_WHOISUSER,
1546 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1547 })
1548 dc.SendMessage(&irc.Message{
1549 Prefix: dc.srv.prefix(),
1550 Command: irc.RPL_WHOISSERVER,
1551 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1552 })
1553 dc.SendMessage(&irc.Message{
1554 Prefix: dc.srv.prefix(),
1555 Command: irc.RPL_ENDOFWHOIS,
1556 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1557 })
1558 return nil
1559 }
1560
1561 // TODO: support WHOIS masks
1562 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1563 if err != nil {
1564 return err
1565 }
1566
1567 var params []string
1568 if target != "" {
1569 if target == mask { // WHOIS nick nick
1570 params = []string{upstreamNick, upstreamNick}
1571 } else {
1572 params = []string{target, upstreamNick}
1573 }
1574 } else {
1575 params = []string{upstreamNick}
1576 }
1577
1578 uc.SendMessageLabeled(dc.id, &irc.Message{
1579 Command: "WHOIS",
1580 Params: params,
1581 })
1582 case "PRIVMSG":
1583 var targetsStr, text string
1584 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1585 return err
1586 }
1587 tags := copyClientTags(msg.Tags)
1588
1589 for _, name := range strings.Split(targetsStr, ",") {
1590 if name == serviceNick {
1591 if dc.caps["echo-message"] {
1592 echoTags := tags.Copy()
1593 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1594 dc.SendMessage(&irc.Message{
1595 Tags: echoTags,
1596 Prefix: dc.prefix(),
1597 Command: "PRIVMSG",
1598 Params: []string{name, text},
1599 })
1600 }
1601 handleServicePRIVMSG(dc, text)
1602 continue
1603 }
1604
1605 uc, upstreamName, err := dc.unmarshalEntity(name)
1606 if err != nil {
1607 return err
1608 }
1609
1610 if upstreamName == "NickServ" {
1611 dc.handleNickServPRIVMSG(uc, text)
1612 }
1613
1614 unmarshaledText := text
1615 if uc.isChannel(upstreamName) {
1616 unmarshaledText = dc.unmarshalText(uc, text)
1617 }
1618 uc.SendMessageLabeled(dc.id, &irc.Message{
1619 Tags: tags,
1620 Command: "PRIVMSG",
1621 Params: []string{upstreamName, unmarshaledText},
1622 })
1623
1624 echoTags := tags.Copy()
1625 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1626 echoMsg := &irc.Message{
1627 Tags: echoTags,
1628 Prefix: &irc.Prefix{
1629 Name: uc.nick,
1630 User: uc.username,
1631 },
1632 Command: "PRIVMSG",
1633 Params: []string{upstreamName, text},
1634 }
1635 uc.produce(upstreamName, echoMsg, dc)
1636
1637 uc.updateChannelAutoDetach(upstreamName)
1638 }
1639 case "NOTICE":
1640 var targetsStr, text string
1641 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1642 return err
1643 }
1644 tags := copyClientTags(msg.Tags)
1645
1646 for _, name := range strings.Split(targetsStr, ",") {
1647 uc, upstreamName, err := dc.unmarshalEntity(name)
1648 if err != nil {
1649 return err
1650 }
1651
1652 unmarshaledText := text
1653 if uc.isChannel(upstreamName) {
1654 unmarshaledText = dc.unmarshalText(uc, text)
1655 }
1656 uc.SendMessageLabeled(dc.id, &irc.Message{
1657 Tags: tags,
1658 Command: "NOTICE",
1659 Params: []string{upstreamName, unmarshaledText},
1660 })
1661
1662 uc.updateChannelAutoDetach(upstreamName)
1663 }
1664 case "TAGMSG":
1665 var targetsStr string
1666 if err := parseMessageParams(msg, &targetsStr); err != nil {
1667 return err
1668 }
1669 tags := copyClientTags(msg.Tags)
1670
1671 for _, name := range strings.Split(targetsStr, ",") {
1672 uc, upstreamName, err := dc.unmarshalEntity(name)
1673 if err != nil {
1674 return err
1675 }
1676 if _, ok := uc.caps["message-tags"]; !ok {
1677 continue
1678 }
1679
1680 uc.SendMessageLabeled(dc.id, &irc.Message{
1681 Tags: tags,
1682 Command: "TAGMSG",
1683 Params: []string{upstreamName},
1684 })
1685
1686 uc.updateChannelAutoDetach(upstreamName)
1687 }
1688 case "INVITE":
1689 var user, channel string
1690 if err := parseMessageParams(msg, &user, &channel); err != nil {
1691 return err
1692 }
1693
1694 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1695 if err != nil {
1696 return err
1697 }
1698
1699 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1700 if err != nil {
1701 return err
1702 }
1703
1704 if ucChannel != ucUser {
1705 return ircError{&irc.Message{
1706 Command: irc.ERR_USERNOTINCHANNEL,
1707 Params: []string{dc.nick, user, channel, "They are on another network"},
1708 }}
1709 }
1710 uc := ucChannel
1711
1712 uc.SendMessageLabeled(dc.id, &irc.Message{
1713 Command: "INVITE",
1714 Params: []string{upstreamUser, upstreamChannel},
1715 })
1716 case "CHATHISTORY":
1717 var subcommand string
1718 if err := parseMessageParams(msg, &subcommand); err != nil {
1719 return err
1720 }
1721 var target, criteria, limitStr string
1722 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1723 return ircError{&irc.Message{
1724 Command: "FAIL",
1725 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1726 }}
1727 }
1728
1729 if dc.user.msgStore == nil {
1730 return ircError{&irc.Message{
1731 Command: irc.ERR_UNKNOWNCOMMAND,
1732 Params: []string{dc.nick, subcommand, "Unknown command"},
1733 }}
1734 }
1735
1736 uc, entity, err := dc.unmarshalEntity(target)
1737 if err != nil {
1738 return err
1739 }
1740
1741 // TODO: support msgid criteria
1742 criteriaParts := strings.SplitN(criteria, "=", 2)
1743 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1744 return ircError{&irc.Message{
1745 Command: "FAIL",
1746 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1747 }}
1748 }
1749
1750 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1751 if err != nil {
1752 return ircError{&irc.Message{
1753 Command: "FAIL",
1754 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1755 }}
1756 }
1757
1758 limit, err := strconv.Atoi(limitStr)
1759 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1760 return ircError{&irc.Message{
1761 Command: "FAIL",
1762 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1763 }}
1764 }
1765
1766 var history []*irc.Message
1767 switch subcommand {
1768 case "BEFORE":
1769 history, err = dc.user.msgStore.LoadBeforeTime(uc.network, entity, timestamp, limit)
1770 case "AFTER":
1771 history, err = dc.user.msgStore.LoadAfterTime(uc.network, entity, timestamp, limit)
1772 default:
1773 // TODO: support LATEST, BETWEEN
1774 return ircError{&irc.Message{
1775 Command: "FAIL",
1776 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1777 }}
1778 }
1779 if err != nil {
1780 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1781 return newChatHistoryError(subcommand, target)
1782 }
1783
1784 batchRef := "history"
1785 dc.SendMessage(&irc.Message{
1786 Prefix: dc.srv.prefix(),
1787 Command: "BATCH",
1788 Params: []string{"+" + batchRef, "chathistory", target},
1789 })
1790
1791 for _, msg := range history {
1792 msg.Tags["batch"] = irc.TagValue(batchRef)
1793 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1794 }
1795
1796 dc.SendMessage(&irc.Message{
1797 Prefix: dc.srv.prefix(),
1798 Command: "BATCH",
1799 Params: []string{"-" + batchRef},
1800 })
1801 default:
1802 dc.logger.Printf("unhandled message: %v", msg)
1803 return newUnknownCommandError(msg.Command)
1804 }
1805 return nil
1806}
1807
1808func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1809 username, password, ok := parseNickServCredentials(text, uc.nick)
1810 if !ok {
1811 return
1812 }
1813
1814 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1815 // automatically erase the key pair or any other credentials.
1816 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1817 return
1818 }
1819
1820 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1821 n := uc.network
1822 n.SASL.Mechanism = "PLAIN"
1823 n.SASL.Plain.Username = username
1824 n.SASL.Plain.Password = password
1825 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1826 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1827 }
1828}
1829
1830func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1831 fields := strings.Fields(text)
1832 if len(fields) < 2 {
1833 return "", "", false
1834 }
1835 cmd := strings.ToUpper(fields[0])
1836 params := fields[1:]
1837 switch cmd {
1838 case "REGISTER":
1839 username = nick
1840 password = params[0]
1841 case "IDENTIFY":
1842 if len(params) == 1 {
1843 username = nick
1844 password = params[0]
1845 } else {
1846 username = params[0]
1847 password = params[1]
1848 }
1849 case "SET":
1850 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1851 username = nick
1852 password = params[1]
1853 }
1854 default:
1855 return "", "", false
1856 }
1857 return username, password, true
1858}
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