source: code/trunk/downstream.go@ 523

Last change on this file since 523 was 521, checked in by hubert, 4 years ago

Fix CAP LIST listing disabled capabilities
File size: 48.2 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 "invite-notify": "",
71 "message-tags": "",
72 "sasl": "PLAIN",
73 "server-time": "",
74}
75
76// needAllDownstreamCaps is the list of downstream capabilities that
77// require support from all upstreams to be enabled
78var needAllDownstreamCaps = map[string]string{
79 "away-notify": "",
80 "extended-join": "",
81 "multi-prefix": "",
82}
83
84// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
85// through from the upstream server to downstream clients.
86//
87// This is only effective in single-upstream mode.
88var passthroughIsupport = map[string]bool{
89 "AWAYLEN": true,
90 "CHANLIMIT": true,
91 "CHANMODES": true,
92 "CHANNELLEN": true,
93 "CHANTYPES": true,
94 "EXCEPTS": true,
95 "EXTBAN": true,
96 "HOSTLEN": true,
97 "INVEX": true,
98 "KICKLEN": true,
99 "MAXLIST": true,
100 "MAXTARGETS": true,
101 "MODES": true,
102 "NETWORK": true,
103 "NICKLEN": true,
104 "PREFIX": true,
105 "SAFELIST": true,
106 "TARGMAX": true,
107 "TOPICLEN": true,
108 "USERLEN": true,
109}
110
111type downstreamConn struct {
112 conn
113
114 id uint64
115
116 registered bool
117 user *user
118 nick string
119 nickCM string
120 rawUsername string
121 networkName string
122 clientName string
123 realname string
124 hostname string
125 password string // empty after authentication
126 network *network // can be nil
127
128 negociatingCaps bool
129 capVersion int
130 supportedCaps map[string]string
131 caps map[string]bool
132
133 saslServer sasl.Server
134}
135
136func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
137 remoteAddr := ic.RemoteAddr().String()
138 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
139 options := connOptions{Logger: logger}
140 dc := &downstreamConn{
141 conn: *newConn(srv, ic, &options),
142 id: id,
143 supportedCaps: make(map[string]string),
144 caps: make(map[string]bool),
145 }
146 dc.hostname = remoteAddr
147 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
148 dc.hostname = host
149 }
150 for k, v := range permanentDownstreamCaps {
151 dc.supportedCaps[k] = v
152 }
153 if srv.LogPath != "" {
154 dc.supportedCaps["draft/chathistory"] = ""
155 }
156 return dc
157}
158
159func (dc *downstreamConn) prefix() *irc.Prefix {
160 return &irc.Prefix{
161 Name: dc.nick,
162 User: dc.user.Username,
163 Host: dc.hostname,
164 }
165}
166
167func (dc *downstreamConn) forEachNetwork(f func(*network)) {
168 if dc.network != nil {
169 f(dc.network)
170 } else {
171 dc.user.forEachNetwork(f)
172 }
173}
174
175func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
176 dc.user.forEachUpstream(func(uc *upstreamConn) {
177 if dc.network != nil && uc.network != dc.network {
178 return
179 }
180 f(uc)
181 })
182}
183
184// upstream returns the upstream connection, if any. If there are zero or if
185// there are multiple upstream connections, it returns nil.
186func (dc *downstreamConn) upstream() *upstreamConn {
187 if dc.network == nil {
188 return nil
189 }
190 return dc.network.conn
191}
192
193func isOurNick(net *network, nick string) bool {
194 // TODO: this doesn't account for nick changes
195 if net.conn != nil {
196 return net.casemap(nick) == net.conn.nickCM
197 }
198 // We're not currently connected to the upstream connection, so we don't
199 // know whether this name is our nickname. Best-effort: use the network's
200 // configured nickname and hope it was the one being used when we were
201 // connected.
202 return net.casemap(nick) == net.casemap(net.Nick)
203}
204
205// marshalEntity converts an upstream entity name (ie. channel or nick) into a
206// downstream entity name.
207//
208// This involves adding a "/<network>" suffix if the entity isn't the current
209// user.
210func (dc *downstreamConn) marshalEntity(net *network, name string) string {
211 if isOurNick(net, name) {
212 return dc.nick
213 }
214 name = partialCasemap(net.casemap, name)
215 if dc.network != nil {
216 if dc.network != net {
217 panic("soju: tried to marshal an entity for another network")
218 }
219 return name
220 }
221 return name + "/" + net.GetName()
222}
223
224func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
225 if isOurNick(net, prefix.Name) {
226 return dc.prefix()
227 }
228 prefix.Name = partialCasemap(net.casemap, prefix.Name)
229 if dc.network != nil {
230 if dc.network != net {
231 panic("soju: tried to marshal a user prefix for another network")
232 }
233 return prefix
234 }
235 return &irc.Prefix{
236 Name: prefix.Name + "/" + net.GetName(),
237 User: prefix.User,
238 Host: prefix.Host,
239 }
240}
241
242// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
243// an upstream entity name.
244//
245// This involves removing the "/<network>" suffix.
246func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
247 if uc := dc.upstream(); uc != nil {
248 return uc, name, nil
249 }
250 if dc.network != nil {
251 return nil, "", ircError{&irc.Message{
252 Command: irc.ERR_NOSUCHCHANNEL,
253 Params: []string{name, "Disconnected from upstream network"},
254 }}
255 }
256
257 var conn *upstreamConn
258 if i := strings.LastIndexByte(name, '/'); i >= 0 {
259 network := name[i+1:]
260 name = name[:i]
261
262 dc.forEachUpstream(func(uc *upstreamConn) {
263 if network != uc.network.GetName() {
264 return
265 }
266 conn = uc
267 })
268 }
269
270 if conn == nil {
271 return nil, "", ircError{&irc.Message{
272 Command: irc.ERR_NOSUCHCHANNEL,
273 Params: []string{name, "Missing network suffix in channel name"},
274 }}
275 }
276 return conn, name, nil
277}
278
279func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
280 if dc.upstream() != nil {
281 return text
282 }
283 // TODO: smarter parsing that ignores URLs
284 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
285}
286
287func (dc *downstreamConn) readMessages(ch chan<- event) error {
288 for {
289 msg, err := dc.ReadMessage()
290 if err == io.EOF {
291 break
292 } else if err != nil {
293 return fmt.Errorf("failed to read IRC command: %v", err)
294 }
295
296 ch <- eventDownstreamMessage{msg, dc}
297 }
298
299 return nil
300}
301
302// SendMessage sends an outgoing message.
303//
304// This can only called from the user goroutine.
305func (dc *downstreamConn) SendMessage(msg *irc.Message) {
306 if !dc.caps["message-tags"] {
307 if msg.Command == "TAGMSG" {
308 return
309 }
310 msg = msg.Copy()
311 for name := range msg.Tags {
312 supported := false
313 switch name {
314 case "time":
315 supported = dc.caps["server-time"]
316 }
317 if !supported {
318 delete(msg.Tags, name)
319 }
320 }
321 }
322 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
323 msg.Params = msg.Params[:1]
324 }
325
326 dc.conn.SendMessage(msg)
327}
328
329// sendMessageWithID sends an outgoing message with the specified internal ID.
330func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
331 dc.SendMessage(msg)
332
333 if id == "" || !dc.messageSupportsHistory(msg) {
334 return
335 }
336
337 dc.sendPing(id)
338}
339
340// advanceMessageWithID advances history to the specified message ID without
341// sending a message. This is useful e.g. for self-messages when echo-message
342// isn't enabled.
343func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
344 if id == "" || !dc.messageSupportsHistory(msg) {
345 return
346 }
347
348 dc.sendPing(id)
349}
350
351// ackMsgID acknowledges that a message has been received.
352func (dc *downstreamConn) ackMsgID(id string) {
353 netID, entity, err := parseMsgID(id, nil)
354 if err != nil {
355 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
356 return
357 }
358
359 network := dc.user.getNetworkByID(netID)
360 if network == nil {
361 return
362 }
363
364 network.delivered.StoreID(entity, dc.clientName, id)
365}
366
367func (dc *downstreamConn) sendPing(msgID string) {
368 token := "soju-msgid-" + msgID
369 dc.SendMessage(&irc.Message{
370 Command: "PING",
371 Params: []string{token},
372 })
373}
374
375func (dc *downstreamConn) handlePong(token string) {
376 if !strings.HasPrefix(token, "soju-msgid-") {
377 dc.logger.Printf("received unrecognized PONG token %q", token)
378 return
379 }
380 msgID := strings.TrimPrefix(token, "soju-msgid-")
381 dc.ackMsgID(msgID)
382}
383
384// marshalMessage re-formats a message coming from an upstream connection so
385// that it's suitable for being sent on this downstream connection. Only
386// messages that may appear in logs are supported, except MODE.
387func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
388 msg = msg.Copy()
389 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
390
391 switch msg.Command {
392 case "PRIVMSG", "NOTICE", "TAGMSG":
393 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
394 case "NICK":
395 // Nick change for another user
396 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
397 case "JOIN", "PART":
398 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
399 case "KICK":
400 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
401 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
402 case "TOPIC":
403 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
404 case "QUIT":
405 // This space is intentionally left blank
406 default:
407 panic(fmt.Sprintf("unexpected %q message", msg.Command))
408 }
409
410 return msg
411}
412
413func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
414 switch msg.Command {
415 case "QUIT":
416 return dc.Close()
417 default:
418 if dc.registered {
419 return dc.handleMessageRegistered(msg)
420 } else {
421 return dc.handleMessageUnregistered(msg)
422 }
423 }
424}
425
426func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
427 switch msg.Command {
428 case "NICK":
429 var nick string
430 if err := parseMessageParams(msg, &nick); err != nil {
431 return err
432 }
433 if strings.ContainsAny(nick, illegalNickChars) {
434 return ircError{&irc.Message{
435 Command: irc.ERR_ERRONEUSNICKNAME,
436 Params: []string{dc.nick, nick, "contains illegal characters"},
437 }}
438 }
439 nickCM := casemapASCII(nick)
440 if nickCM == serviceNickCM {
441 return ircError{&irc.Message{
442 Command: irc.ERR_NICKNAMEINUSE,
443 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
444 }}
445 }
446 dc.nick = nick
447 dc.nickCM = nickCM
448 case "USER":
449 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
450 return err
451 }
452 case "PASS":
453 if err := parseMessageParams(msg, &dc.password); err != nil {
454 return err
455 }
456 case "CAP":
457 var subCmd string
458 if err := parseMessageParams(msg, &subCmd); err != nil {
459 return err
460 }
461 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
462 return err
463 }
464 case "AUTHENTICATE":
465 if !dc.caps["sasl"] {
466 return ircError{&irc.Message{
467 Command: irc.ERR_SASLFAIL,
468 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
469 }}
470 }
471 if len(msg.Params) == 0 {
472 return ircError{&irc.Message{
473 Command: irc.ERR_SASLFAIL,
474 Params: []string{"*", "Missing AUTHENTICATE argument"},
475 }}
476 }
477 if dc.nick == "" {
478 return ircError{&irc.Message{
479 Command: irc.ERR_SASLFAIL,
480 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
481 }}
482 }
483
484 var resp []byte
485 if dc.saslServer == nil {
486 mech := strings.ToUpper(msg.Params[0])
487 switch mech {
488 case "PLAIN":
489 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
490 return dc.authenticate(username, password)
491 }))
492 default:
493 return ircError{&irc.Message{
494 Command: irc.ERR_SASLFAIL,
495 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
496 }}
497 }
498 } else if msg.Params[0] == "*" {
499 dc.saslServer = nil
500 return ircError{&irc.Message{
501 Command: irc.ERR_SASLABORTED,
502 Params: []string{"*", "SASL authentication aborted"},
503 }}
504 } else if msg.Params[0] == "+" {
505 resp = nil
506 } else {
507 // TODO: multi-line messages
508 var err error
509 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
510 if err != nil {
511 dc.saslServer = nil
512 return ircError{&irc.Message{
513 Command: irc.ERR_SASLFAIL,
514 Params: []string{"*", "Invalid base64-encoded response"},
515 }}
516 }
517 }
518
519 challenge, done, err := dc.saslServer.Next(resp)
520 if err != nil {
521 dc.saslServer = nil
522 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
523 return ircError{&irc.Message{
524 Command: irc.ERR_SASLFAIL,
525 Params: []string{"*", ircErr.Message.Params[1]},
526 }}
527 }
528 dc.SendMessage(&irc.Message{
529 Prefix: dc.srv.prefix(),
530 Command: irc.ERR_SASLFAIL,
531 Params: []string{"*", "SASL error"},
532 })
533 return fmt.Errorf("SASL authentication failed: %v", err)
534 } else if done {
535 dc.saslServer = nil
536 dc.SendMessage(&irc.Message{
537 Prefix: dc.srv.prefix(),
538 Command: irc.RPL_LOGGEDIN,
539 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
540 })
541 dc.SendMessage(&irc.Message{
542 Prefix: dc.srv.prefix(),
543 Command: irc.RPL_SASLSUCCESS,
544 Params: []string{dc.nick, "SASL authentication successful"},
545 })
546 } else {
547 challengeStr := "+"
548 if len(challenge) > 0 {
549 challengeStr = base64.StdEncoding.EncodeToString(challenge)
550 }
551
552 // TODO: multi-line messages
553 dc.SendMessage(&irc.Message{
554 Prefix: dc.srv.prefix(),
555 Command: "AUTHENTICATE",
556 Params: []string{challengeStr},
557 })
558 }
559 default:
560 dc.logger.Printf("unhandled message: %v", msg)
561 return newUnknownCommandError(msg.Command)
562 }
563 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
564 return dc.register()
565 }
566 return nil
567}
568
569func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
570 cmd = strings.ToUpper(cmd)
571
572 replyTo := dc.nick
573 if !dc.registered {
574 replyTo = "*"
575 }
576
577 switch cmd {
578 case "LS":
579 if len(args) > 0 {
580 var err error
581 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
582 return err
583 }
584 }
585 if !dc.registered && dc.capVersion >= 302 {
586 // Let downstream show everything it supports, and trim
587 // down the available capabilities when upstreams are
588 // known.
589 for k, v := range needAllDownstreamCaps {
590 dc.supportedCaps[k] = v
591 }
592 }
593
594 caps := make([]string, 0, len(dc.supportedCaps))
595 for k, v := range dc.supportedCaps {
596 if dc.capVersion >= 302 && v != "" {
597 caps = append(caps, k+"="+v)
598 } else {
599 caps = append(caps, k)
600 }
601 }
602
603 // TODO: multi-line replies
604 dc.SendMessage(&irc.Message{
605 Prefix: dc.srv.prefix(),
606 Command: "CAP",
607 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
608 })
609
610 if dc.capVersion >= 302 {
611 // CAP version 302 implicitly enables cap-notify
612 dc.caps["cap-notify"] = true
613 }
614
615 if !dc.registered {
616 dc.negociatingCaps = true
617 }
618 case "LIST":
619 var caps []string
620 for name, enabled := range dc.caps {
621 if enabled {
622 caps = append(caps, name)
623 }
624 }
625
626 // TODO: multi-line replies
627 dc.SendMessage(&irc.Message{
628 Prefix: dc.srv.prefix(),
629 Command: "CAP",
630 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
631 })
632 case "REQ":
633 if len(args) == 0 {
634 return ircError{&irc.Message{
635 Command: err_invalidcapcmd,
636 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
637 }}
638 }
639
640 // TODO: atomically ack/nak the whole capability set
641 caps := strings.Fields(args[0])
642 ack := true
643 for _, name := range caps {
644 name = strings.ToLower(name)
645 enable := !strings.HasPrefix(name, "-")
646 if !enable {
647 name = strings.TrimPrefix(name, "-")
648 }
649
650 if enable == dc.caps[name] {
651 continue
652 }
653
654 _, ok := dc.supportedCaps[name]
655 if !ok {
656 ack = false
657 break
658 }
659
660 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
661 // cap-notify cannot be disabled with CAP version 302
662 ack = false
663 break
664 }
665
666 dc.caps[name] = enable
667 }
668
669 reply := "NAK"
670 if ack {
671 reply = "ACK"
672 }
673 dc.SendMessage(&irc.Message{
674 Prefix: dc.srv.prefix(),
675 Command: "CAP",
676 Params: []string{replyTo, reply, args[0]},
677 })
678 case "END":
679 dc.negociatingCaps = false
680 default:
681 return ircError{&irc.Message{
682 Command: err_invalidcapcmd,
683 Params: []string{replyTo, cmd, "Unknown CAP command"},
684 }}
685 }
686 return nil
687}
688
689func (dc *downstreamConn) setSupportedCap(name, value string) {
690 prevValue, hasPrev := dc.supportedCaps[name]
691 changed := !hasPrev || prevValue != value
692 dc.supportedCaps[name] = value
693
694 if !dc.caps["cap-notify"] || !changed {
695 return
696 }
697
698 replyTo := dc.nick
699 if !dc.registered {
700 replyTo = "*"
701 }
702
703 cap := name
704 if value != "" && dc.capVersion >= 302 {
705 cap = name + "=" + value
706 }
707
708 dc.SendMessage(&irc.Message{
709 Prefix: dc.srv.prefix(),
710 Command: "CAP",
711 Params: []string{replyTo, "NEW", cap},
712 })
713}
714
715func (dc *downstreamConn) unsetSupportedCap(name string) {
716 _, hasPrev := dc.supportedCaps[name]
717 delete(dc.supportedCaps, name)
718 delete(dc.caps, name)
719
720 if !dc.caps["cap-notify"] || !hasPrev {
721 return
722 }
723
724 replyTo := dc.nick
725 if !dc.registered {
726 replyTo = "*"
727 }
728
729 dc.SendMessage(&irc.Message{
730 Prefix: dc.srv.prefix(),
731 Command: "CAP",
732 Params: []string{replyTo, "DEL", name},
733 })
734}
735
736func (dc *downstreamConn) updateSupportedCaps() {
737 supportedCaps := make(map[string]bool)
738 for cap := range needAllDownstreamCaps {
739 supportedCaps[cap] = true
740 }
741 dc.forEachUpstream(func(uc *upstreamConn) {
742 for cap, supported := range supportedCaps {
743 supportedCaps[cap] = supported && uc.caps[cap]
744 }
745 })
746
747 for cap, supported := range supportedCaps {
748 if supported {
749 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
750 } else {
751 dc.unsetSupportedCap(cap)
752 }
753 }
754}
755
756func (dc *downstreamConn) updateNick() {
757 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
758 dc.SendMessage(&irc.Message{
759 Prefix: dc.prefix(),
760 Command: "NICK",
761 Params: []string{uc.nick},
762 })
763 dc.nick = uc.nick
764 dc.nickCM = casemapASCII(dc.nick)
765 }
766}
767
768func sanityCheckServer(addr string) error {
769 dialer := net.Dialer{Timeout: 30 * time.Second}
770 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
771 if err != nil {
772 return err
773 }
774 return conn.Close()
775}
776
777func unmarshalUsername(rawUsername string) (username, client, network string) {
778 username = rawUsername
779
780 i := strings.IndexAny(username, "/@")
781 j := strings.LastIndexAny(username, "/@")
782 if i >= 0 {
783 username = rawUsername[:i]
784 }
785 if j >= 0 {
786 if rawUsername[j] == '@' {
787 client = rawUsername[j+1:]
788 } else {
789 network = rawUsername[j+1:]
790 }
791 }
792 if i >= 0 && j >= 0 && i < j {
793 if rawUsername[i] == '@' {
794 client = rawUsername[i+1 : j]
795 } else {
796 network = rawUsername[i+1 : j]
797 }
798 }
799
800 return username, client, network
801}
802
803func (dc *downstreamConn) authenticate(username, password string) error {
804 username, clientName, networkName := unmarshalUsername(username)
805
806 u, err := dc.srv.db.GetUser(username)
807 if err != nil {
808 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
809 return errAuthFailed
810 }
811
812 // Password auth disabled
813 if u.Password == "" {
814 return errAuthFailed
815 }
816
817 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
818 if err != nil {
819 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
820 return errAuthFailed
821 }
822
823 dc.user = dc.srv.getUser(username)
824 if dc.user == nil {
825 dc.logger.Printf("failed authentication for %q: user not active", username)
826 return errAuthFailed
827 }
828 dc.clientName = clientName
829 dc.networkName = networkName
830 return nil
831}
832
833func (dc *downstreamConn) register() error {
834 if dc.registered {
835 return fmt.Errorf("tried to register twice")
836 }
837
838 password := dc.password
839 dc.password = ""
840 if dc.user == nil {
841 if err := dc.authenticate(dc.rawUsername, password); err != nil {
842 return err
843 }
844 }
845
846 if dc.clientName == "" && dc.networkName == "" {
847 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
848 }
849
850 dc.registered = true
851 dc.logger.Printf("registration complete for user %q", dc.user.Username)
852 return nil
853}
854
855func (dc *downstreamConn) loadNetwork() error {
856 if dc.networkName == "" {
857 return nil
858 }
859
860 network := dc.user.getNetwork(dc.networkName)
861 if network == nil {
862 addr := dc.networkName
863 if !strings.ContainsRune(addr, ':') {
864 addr = addr + ":6697"
865 }
866
867 dc.logger.Printf("trying to connect to new network %q", addr)
868 if err := sanityCheckServer(addr); err != nil {
869 dc.logger.Printf("failed to connect to %q: %v", addr, err)
870 return ircError{&irc.Message{
871 Command: irc.ERR_PASSWDMISMATCH,
872 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
873 }}
874 }
875
876 // Some clients only allow specifying the nickname (and use the
877 // nickname as a username too). Strip the network name from the
878 // nickname when auto-saving networks.
879 nick, _, _ := unmarshalUsername(dc.nick)
880
881 dc.logger.Printf("auto-saving network %q", dc.networkName)
882 var err error
883 network, err = dc.user.createNetwork(&Network{
884 Addr: dc.networkName,
885 Nick: nick,
886 })
887 if err != nil {
888 return err
889 }
890 }
891
892 dc.network = network
893 return nil
894}
895
896func (dc *downstreamConn) welcome() error {
897 if dc.user == nil || !dc.registered {
898 panic("tried to welcome an unregistered connection")
899 }
900
901 // TODO: doing this might take some time. We should do it in dc.register
902 // instead, but we'll potentially be adding a new network and this must be
903 // done in the user goroutine.
904 if err := dc.loadNetwork(); err != nil {
905 return err
906 }
907
908 isupport := []string{
909 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
910 "CASEMAPPING=ascii",
911 }
912
913 if uc := dc.upstream(); uc != nil {
914 for k := range passthroughIsupport {
915 v, ok := uc.isupport[k]
916 if !ok {
917 continue
918 }
919 if v != nil {
920 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
921 } else {
922 isupport = append(isupport, k)
923 }
924 }
925 }
926
927 dc.SendMessage(&irc.Message{
928 Prefix: dc.srv.prefix(),
929 Command: irc.RPL_WELCOME,
930 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
931 })
932 dc.SendMessage(&irc.Message{
933 Prefix: dc.srv.prefix(),
934 Command: irc.RPL_YOURHOST,
935 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
936 })
937 dc.SendMessage(&irc.Message{
938 Prefix: dc.srv.prefix(),
939 Command: irc.RPL_CREATED,
940 Params: []string{dc.nick, "Who cares when the server was created?"},
941 })
942 dc.SendMessage(&irc.Message{
943 Prefix: dc.srv.prefix(),
944 Command: irc.RPL_MYINFO,
945 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
946 })
947 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
948 dc.SendMessage(msg)
949 }
950 dc.SendMessage(&irc.Message{
951 Prefix: dc.srv.prefix(),
952 Command: irc.ERR_NOMOTD,
953 Params: []string{dc.nick, "No MOTD"},
954 })
955
956 dc.updateNick()
957 dc.updateSupportedCaps()
958
959 dc.forEachUpstream(func(uc *upstreamConn) {
960 for _, entry := range uc.channels.innerMap {
961 ch := entry.value.(*upstreamChannel)
962 if !ch.complete {
963 continue
964 }
965 record := uc.network.channels.Value(ch.Name)
966 if record != nil && record.Detached {
967 continue
968 }
969
970 dc.SendMessage(&irc.Message{
971 Prefix: dc.prefix(),
972 Command: "JOIN",
973 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
974 })
975
976 forwardChannel(dc, ch)
977 }
978 })
979
980 dc.forEachNetwork(func(net *network) {
981 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
982 return
983 }
984
985 // Only send history if we're the first connected client with that name
986 // for the network
987 firstClient := true
988 dc.user.forEachDownstream(func(c *downstreamConn) {
989 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
990 firstClient = false
991 }
992 })
993 if firstClient {
994 net.delivered.ForEachTarget(func(target string) {
995 lastDelivered := net.delivered.LoadID(target, dc.clientName)
996 if lastDelivered == "" {
997 return
998 }
999
1000 dc.sendTargetBacklog(net, target, lastDelivered)
1001
1002 // Fast-forward history to last message
1003 targetCM := net.casemap(target)
1004 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1005 if err != nil {
1006 dc.logger.Printf("failed to get last message ID: %v", err)
1007 return
1008 }
1009 net.delivered.StoreID(target, dc.clientName, lastID)
1010 })
1011 }
1012 })
1013
1014 return nil
1015}
1016
1017// messageSupportsHistory checks whether the provided message can be sent as
1018// part of an history batch.
1019func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1020 // Don't replay all messages, because that would mess up client
1021 // state. For instance we just sent the list of users, sending
1022 // PART messages for one of these users would be incorrect.
1023 // TODO: add support for draft/event-playback
1024 switch msg.Command {
1025 case "PRIVMSG", "NOTICE":
1026 return true
1027 }
1028 return false
1029}
1030
1031func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1032 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1033 return
1034 }
1035
1036 ch := net.channels.Value(target)
1037
1038 limit := 4000
1039 targetCM := net.casemap(target)
1040 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1041 if err != nil {
1042 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1043 return
1044 }
1045
1046 batchRef := "history"
1047 if dc.caps["batch"] {
1048 dc.SendMessage(&irc.Message{
1049 Prefix: dc.srv.prefix(),
1050 Command: "BATCH",
1051 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1052 })
1053 }
1054
1055 for _, msg := range history {
1056 if !dc.messageSupportsHistory(msg) {
1057 continue
1058 }
1059
1060 if ch != nil && ch.Detached {
1061 if net.detachedMessageNeedsRelay(ch, msg) {
1062 dc.relayDetachedMessage(net, msg)
1063 }
1064 } else {
1065 if dc.caps["batch"] {
1066 msg.Tags["batch"] = irc.TagValue(batchRef)
1067 }
1068 dc.SendMessage(dc.marshalMessage(msg, net))
1069 }
1070 }
1071
1072 if dc.caps["batch"] {
1073 dc.SendMessage(&irc.Message{
1074 Prefix: dc.srv.prefix(),
1075 Command: "BATCH",
1076 Params: []string{"-" + batchRef},
1077 })
1078 }
1079}
1080
1081func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1082 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1083 return
1084 }
1085
1086 sender := msg.Prefix.Name
1087 target, text := msg.Params[0], msg.Params[1]
1088 if net.isHighlight(msg) {
1089 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1090 } else {
1091 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1092 }
1093}
1094
1095func (dc *downstreamConn) runUntilRegistered() error {
1096 for !dc.registered {
1097 msg, err := dc.ReadMessage()
1098 if err != nil {
1099 return fmt.Errorf("failed to read IRC command: %v", err)
1100 }
1101
1102 err = dc.handleMessage(msg)
1103 if ircErr, ok := err.(ircError); ok {
1104 ircErr.Message.Prefix = dc.srv.prefix()
1105 dc.SendMessage(ircErr.Message)
1106 } else if err != nil {
1107 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1108 }
1109 }
1110
1111 return nil
1112}
1113
1114func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1115 switch msg.Command {
1116 case "CAP":
1117 var subCmd string
1118 if err := parseMessageParams(msg, &subCmd); err != nil {
1119 return err
1120 }
1121 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1122 return err
1123 }
1124 case "PING":
1125 var source, destination string
1126 if err := parseMessageParams(msg, &source); err != nil {
1127 return err
1128 }
1129 if len(msg.Params) > 1 {
1130 destination = msg.Params[1]
1131 }
1132 if destination != "" && destination != dc.srv.Hostname {
1133 return ircError{&irc.Message{
1134 Command: irc.ERR_NOSUCHSERVER,
1135 Params: []string{dc.nick, destination, "No such server"},
1136 }}
1137 }
1138 dc.SendMessage(&irc.Message{
1139 Prefix: dc.srv.prefix(),
1140 Command: "PONG",
1141 Params: []string{dc.srv.Hostname, source},
1142 })
1143 return nil
1144 case "PONG":
1145 if len(msg.Params) == 0 {
1146 return newNeedMoreParamsError(msg.Command)
1147 }
1148 token := msg.Params[len(msg.Params)-1]
1149 dc.handlePong(token)
1150 case "USER":
1151 return ircError{&irc.Message{
1152 Command: irc.ERR_ALREADYREGISTERED,
1153 Params: []string{dc.nick, "You may not reregister"},
1154 }}
1155 case "NICK":
1156 var rawNick string
1157 if err := parseMessageParams(msg, &rawNick); err != nil {
1158 return err
1159 }
1160
1161 nick := rawNick
1162 var upstream *upstreamConn
1163 if dc.upstream() == nil {
1164 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1165 if err == nil { // NICK nick/network: NICK only on a specific upstream
1166 upstream = uc
1167 nick = unmarshaledNick
1168 }
1169 }
1170
1171 if strings.ContainsAny(nick, illegalNickChars) {
1172 return ircError{&irc.Message{
1173 Command: irc.ERR_ERRONEUSNICKNAME,
1174 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1175 }}
1176 }
1177 if casemapASCII(nick) == serviceNickCM {
1178 return ircError{&irc.Message{
1179 Command: irc.ERR_NICKNAMEINUSE,
1180 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1181 }}
1182 }
1183
1184 var err error
1185 dc.forEachNetwork(func(n *network) {
1186 if err != nil || (upstream != nil && upstream.network != n) {
1187 return
1188 }
1189 n.Nick = nick
1190 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1191 })
1192 if err != nil {
1193 return err
1194 }
1195
1196 dc.forEachUpstream(func(uc *upstreamConn) {
1197 if upstream != nil && upstream != uc {
1198 return
1199 }
1200 uc.SendMessageLabeled(dc.id, &irc.Message{
1201 Command: "NICK",
1202 Params: []string{nick},
1203 })
1204 })
1205
1206 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1207 dc.SendMessage(&irc.Message{
1208 Prefix: dc.prefix(),
1209 Command: "NICK",
1210 Params: []string{nick},
1211 })
1212 dc.nick = nick
1213 dc.nickCM = casemapASCII(dc.nick)
1214 }
1215 case "JOIN":
1216 var namesStr string
1217 if err := parseMessageParams(msg, &namesStr); err != nil {
1218 return err
1219 }
1220
1221 var keys []string
1222 if len(msg.Params) > 1 {
1223 keys = strings.Split(msg.Params[1], ",")
1224 }
1225
1226 for i, name := range strings.Split(namesStr, ",") {
1227 uc, upstreamName, err := dc.unmarshalEntity(name)
1228 if err != nil {
1229 return err
1230 }
1231
1232 var key string
1233 if len(keys) > i {
1234 key = keys[i]
1235 }
1236
1237 params := []string{upstreamName}
1238 if key != "" {
1239 params = append(params, key)
1240 }
1241 uc.SendMessageLabeled(dc.id, &irc.Message{
1242 Command: "JOIN",
1243 Params: params,
1244 })
1245
1246 ch := uc.network.channels.Value(upstreamName)
1247 if ch != nil {
1248 // Don't clear the channel key if there's one set
1249 // TODO: add a way to unset the channel key
1250 if key != "" {
1251 ch.Key = key
1252 }
1253 uc.network.attach(ch)
1254 } else {
1255 ch = &Channel{
1256 Name: upstreamName,
1257 Key: key,
1258 }
1259 uc.network.channels.SetValue(upstreamName, ch)
1260 }
1261 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1262 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1263 }
1264 }
1265 case "PART":
1266 var namesStr string
1267 if err := parseMessageParams(msg, &namesStr); err != nil {
1268 return err
1269 }
1270
1271 var reason string
1272 if len(msg.Params) > 1 {
1273 reason = msg.Params[1]
1274 }
1275
1276 for _, name := range strings.Split(namesStr, ",") {
1277 uc, upstreamName, err := dc.unmarshalEntity(name)
1278 if err != nil {
1279 return err
1280 }
1281
1282 if strings.EqualFold(reason, "detach") {
1283 ch := uc.network.channels.Value(upstreamName)
1284 if ch != nil {
1285 uc.network.detach(ch)
1286 } else {
1287 ch = &Channel{
1288 Name: name,
1289 Detached: true,
1290 }
1291 uc.network.channels.SetValue(upstreamName, ch)
1292 }
1293 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1294 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1295 }
1296 } else {
1297 params := []string{upstreamName}
1298 if reason != "" {
1299 params = append(params, reason)
1300 }
1301 uc.SendMessageLabeled(dc.id, &irc.Message{
1302 Command: "PART",
1303 Params: params,
1304 })
1305
1306 if err := uc.network.deleteChannel(upstreamName); err != nil {
1307 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1308 }
1309 }
1310 }
1311 case "KICK":
1312 var channelStr, userStr string
1313 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1314 return err
1315 }
1316
1317 channels := strings.Split(channelStr, ",")
1318 users := strings.Split(userStr, ",")
1319
1320 var reason string
1321 if len(msg.Params) > 2 {
1322 reason = msg.Params[2]
1323 }
1324
1325 if len(channels) != 1 && len(channels) != len(users) {
1326 return ircError{&irc.Message{
1327 Command: irc.ERR_BADCHANMASK,
1328 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1329 }}
1330 }
1331
1332 for i, user := range users {
1333 var channel string
1334 if len(channels) == 1 {
1335 channel = channels[0]
1336 } else {
1337 channel = channels[i]
1338 }
1339
1340 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1341 if err != nil {
1342 return err
1343 }
1344
1345 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1346 if err != nil {
1347 return err
1348 }
1349
1350 if ucChannel != ucUser {
1351 return ircError{&irc.Message{
1352 Command: irc.ERR_USERNOTINCHANNEL,
1353 Params: []string{dc.nick, user, channel, "They are on another network"},
1354 }}
1355 }
1356 uc := ucChannel
1357
1358 params := []string{upstreamChannel, upstreamUser}
1359 if reason != "" {
1360 params = append(params, reason)
1361 }
1362 uc.SendMessageLabeled(dc.id, &irc.Message{
1363 Command: "KICK",
1364 Params: params,
1365 })
1366 }
1367 case "MODE":
1368 var name string
1369 if err := parseMessageParams(msg, &name); err != nil {
1370 return err
1371 }
1372
1373 var modeStr string
1374 if len(msg.Params) > 1 {
1375 modeStr = msg.Params[1]
1376 }
1377
1378 if casemapASCII(name) == dc.nickCM {
1379 if modeStr != "" {
1380 dc.forEachUpstream(func(uc *upstreamConn) {
1381 uc.SendMessageLabeled(dc.id, &irc.Message{
1382 Command: "MODE",
1383 Params: []string{uc.nick, modeStr},
1384 })
1385 })
1386 } else {
1387 // TODO: only do this in multi-upstream mode
1388 dc.SendMessage(&irc.Message{
1389 Prefix: dc.srv.prefix(),
1390 Command: irc.RPL_UMODEIS,
1391 Params: []string{dc.nick, ""}, // TODO
1392 })
1393 }
1394 return nil
1395 }
1396
1397 uc, upstreamName, err := dc.unmarshalEntity(name)
1398 if err != nil {
1399 return err
1400 }
1401
1402 if !uc.isChannel(upstreamName) {
1403 return ircError{&irc.Message{
1404 Command: irc.ERR_USERSDONTMATCH,
1405 Params: []string{dc.nick, "Cannot change mode for other users"},
1406 }}
1407 }
1408
1409 if modeStr != "" {
1410 params := []string{upstreamName, modeStr}
1411 params = append(params, msg.Params[2:]...)
1412 uc.SendMessageLabeled(dc.id, &irc.Message{
1413 Command: "MODE",
1414 Params: params,
1415 })
1416 } else {
1417 ch := uc.channels.Value(upstreamName)
1418 if ch == nil {
1419 return ircError{&irc.Message{
1420 Command: irc.ERR_NOSUCHCHANNEL,
1421 Params: []string{dc.nick, name, "No such channel"},
1422 }}
1423 }
1424
1425 if ch.modes == nil {
1426 // we haven't received the initial RPL_CHANNELMODEIS yet
1427 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1428 return nil
1429 }
1430
1431 modeStr, modeParams := ch.modes.Format()
1432 params := []string{dc.nick, name, modeStr}
1433 params = append(params, modeParams...)
1434
1435 dc.SendMessage(&irc.Message{
1436 Prefix: dc.srv.prefix(),
1437 Command: irc.RPL_CHANNELMODEIS,
1438 Params: params,
1439 })
1440 if ch.creationTime != "" {
1441 dc.SendMessage(&irc.Message{
1442 Prefix: dc.srv.prefix(),
1443 Command: rpl_creationtime,
1444 Params: []string{dc.nick, name, ch.creationTime},
1445 })
1446 }
1447 }
1448 case "TOPIC":
1449 var channel string
1450 if err := parseMessageParams(msg, &channel); err != nil {
1451 return err
1452 }
1453
1454 uc, upstreamName, err := dc.unmarshalEntity(channel)
1455 if err != nil {
1456 return err
1457 }
1458
1459 if len(msg.Params) > 1 { // setting topic
1460 topic := msg.Params[1]
1461 uc.SendMessageLabeled(dc.id, &irc.Message{
1462 Command: "TOPIC",
1463 Params: []string{upstreamName, topic},
1464 })
1465 } else { // getting topic
1466 ch := uc.channels.Value(upstreamName)
1467 if ch == nil {
1468 return ircError{&irc.Message{
1469 Command: irc.ERR_NOSUCHCHANNEL,
1470 Params: []string{dc.nick, upstreamName, "No such channel"},
1471 }}
1472 }
1473 sendTopic(dc, ch)
1474 }
1475 case "LIST":
1476 // TODO: support ELIST when supported by all upstreams
1477
1478 pl := pendingLIST{
1479 downstreamID: dc.id,
1480 pendingCommands: make(map[int64]*irc.Message),
1481 }
1482 var upstream *upstreamConn
1483 var upstreamChannels map[int64][]string
1484 if len(msg.Params) > 0 {
1485 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1486 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1487 upstream = uc
1488 } else {
1489 upstreamChannels = make(map[int64][]string)
1490 channels := strings.Split(msg.Params[0], ",")
1491 for _, channel := range channels {
1492 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1493 if err != nil {
1494 return err
1495 }
1496 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1497 }
1498 }
1499 }
1500
1501 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1502 dc.forEachUpstream(func(uc *upstreamConn) {
1503 if upstream != nil && upstream != uc {
1504 return
1505 }
1506 var params []string
1507 if upstreamChannels != nil {
1508 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1509 params = []string{strings.Join(channels, ",")}
1510 } else {
1511 return
1512 }
1513 }
1514 pl.pendingCommands[uc.network.ID] = &irc.Message{
1515 Command: "LIST",
1516 Params: params,
1517 }
1518 uc.trySendLIST(dc.id)
1519 })
1520 case "NAMES":
1521 if len(msg.Params) == 0 {
1522 dc.SendMessage(&irc.Message{
1523 Prefix: dc.srv.prefix(),
1524 Command: irc.RPL_ENDOFNAMES,
1525 Params: []string{dc.nick, "*", "End of /NAMES list"},
1526 })
1527 return nil
1528 }
1529
1530 channels := strings.Split(msg.Params[0], ",")
1531 for _, channel := range channels {
1532 uc, upstreamName, err := dc.unmarshalEntity(channel)
1533 if err != nil {
1534 return err
1535 }
1536
1537 ch := uc.channels.Value(upstreamName)
1538 if ch != nil {
1539 sendNames(dc, ch)
1540 } else {
1541 // NAMES on a channel we have not joined, ask upstream
1542 uc.SendMessageLabeled(dc.id, &irc.Message{
1543 Command: "NAMES",
1544 Params: []string{upstreamName},
1545 })
1546 }
1547 }
1548 case "WHO":
1549 if len(msg.Params) == 0 {
1550 // TODO: support WHO without parameters
1551 dc.SendMessage(&irc.Message{
1552 Prefix: dc.srv.prefix(),
1553 Command: irc.RPL_ENDOFWHO,
1554 Params: []string{dc.nick, "*", "End of /WHO list"},
1555 })
1556 return nil
1557 }
1558
1559 // TODO: support WHO masks
1560 entity := msg.Params[0]
1561 entityCM := casemapASCII(entity)
1562
1563 if dc.network == nil && entityCM == dc.nickCM {
1564 // TODO: support AWAY (H/G) in self WHO reply
1565 dc.SendMessage(&irc.Message{
1566 Prefix: dc.srv.prefix(),
1567 Command: irc.RPL_WHOREPLY,
1568 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1569 })
1570 dc.SendMessage(&irc.Message{
1571 Prefix: dc.srv.prefix(),
1572 Command: irc.RPL_ENDOFWHO,
1573 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1574 })
1575 return nil
1576 }
1577 if entityCM == serviceNickCM {
1578 dc.SendMessage(&irc.Message{
1579 Prefix: dc.srv.prefix(),
1580 Command: irc.RPL_WHOREPLY,
1581 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1582 })
1583 dc.SendMessage(&irc.Message{
1584 Prefix: dc.srv.prefix(),
1585 Command: irc.RPL_ENDOFWHO,
1586 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1587 })
1588 return nil
1589 }
1590
1591 uc, upstreamName, err := dc.unmarshalEntity(entity)
1592 if err != nil {
1593 return err
1594 }
1595
1596 var params []string
1597 if len(msg.Params) == 2 {
1598 params = []string{upstreamName, msg.Params[1]}
1599 } else {
1600 params = []string{upstreamName}
1601 }
1602
1603 uc.SendMessageLabeled(dc.id, &irc.Message{
1604 Command: "WHO",
1605 Params: params,
1606 })
1607 case "WHOIS":
1608 if len(msg.Params) == 0 {
1609 return ircError{&irc.Message{
1610 Command: irc.ERR_NONICKNAMEGIVEN,
1611 Params: []string{dc.nick, "No nickname given"},
1612 }}
1613 }
1614
1615 var target, mask string
1616 if len(msg.Params) == 1 {
1617 target = ""
1618 mask = msg.Params[0]
1619 } else {
1620 target = msg.Params[0]
1621 mask = msg.Params[1]
1622 }
1623 // TODO: support multiple WHOIS users
1624 if i := strings.IndexByte(mask, ','); i >= 0 {
1625 mask = mask[:i]
1626 }
1627
1628 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1629 dc.SendMessage(&irc.Message{
1630 Prefix: dc.srv.prefix(),
1631 Command: irc.RPL_WHOISUSER,
1632 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1633 })
1634 dc.SendMessage(&irc.Message{
1635 Prefix: dc.srv.prefix(),
1636 Command: irc.RPL_WHOISSERVER,
1637 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1638 })
1639 dc.SendMessage(&irc.Message{
1640 Prefix: dc.srv.prefix(),
1641 Command: irc.RPL_ENDOFWHOIS,
1642 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1643 })
1644 return nil
1645 }
1646
1647 // TODO: support WHOIS masks
1648 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1649 if err != nil {
1650 return err
1651 }
1652
1653 var params []string
1654 if target != "" {
1655 if target == mask { // WHOIS nick nick
1656 params = []string{upstreamNick, upstreamNick}
1657 } else {
1658 params = []string{target, upstreamNick}
1659 }
1660 } else {
1661 params = []string{upstreamNick}
1662 }
1663
1664 uc.SendMessageLabeled(dc.id, &irc.Message{
1665 Command: "WHOIS",
1666 Params: params,
1667 })
1668 case "PRIVMSG":
1669 var targetsStr, text string
1670 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1671 return err
1672 }
1673 tags := copyClientTags(msg.Tags)
1674
1675 for _, name := range strings.Split(targetsStr, ",") {
1676 if casemapASCII(name) == serviceNickCM {
1677 if dc.caps["echo-message"] {
1678 echoTags := tags.Copy()
1679 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1680 dc.SendMessage(&irc.Message{
1681 Tags: echoTags,
1682 Prefix: dc.prefix(),
1683 Command: "PRIVMSG",
1684 Params: []string{name, text},
1685 })
1686 }
1687 handleServicePRIVMSG(dc, text)
1688 continue
1689 }
1690
1691 uc, upstreamName, err := dc.unmarshalEntity(name)
1692 if err != nil {
1693 return err
1694 }
1695
1696 if uc.network.casemap(upstreamName) == "nickserv" {
1697 dc.handleNickServPRIVMSG(uc, text)
1698 }
1699
1700 unmarshaledText := text
1701 if uc.isChannel(upstreamName) {
1702 unmarshaledText = dc.unmarshalText(uc, text)
1703 }
1704 uc.SendMessageLabeled(dc.id, &irc.Message{
1705 Tags: tags,
1706 Command: "PRIVMSG",
1707 Params: []string{upstreamName, unmarshaledText},
1708 })
1709
1710 echoTags := tags.Copy()
1711 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1712 echoMsg := &irc.Message{
1713 Tags: echoTags,
1714 Prefix: &irc.Prefix{
1715 Name: uc.nick,
1716 User: uc.username,
1717 },
1718 Command: "PRIVMSG",
1719 Params: []string{upstreamName, text},
1720 }
1721 uc.produce(upstreamName, echoMsg, dc)
1722
1723 uc.updateChannelAutoDetach(upstreamName)
1724 }
1725 case "NOTICE":
1726 var targetsStr, text string
1727 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1728 return err
1729 }
1730 tags := copyClientTags(msg.Tags)
1731
1732 for _, name := range strings.Split(targetsStr, ",") {
1733 uc, upstreamName, err := dc.unmarshalEntity(name)
1734 if err != nil {
1735 return err
1736 }
1737
1738 unmarshaledText := text
1739 if uc.isChannel(upstreamName) {
1740 unmarshaledText = dc.unmarshalText(uc, text)
1741 }
1742 uc.SendMessageLabeled(dc.id, &irc.Message{
1743 Tags: tags,
1744 Command: "NOTICE",
1745 Params: []string{upstreamName, unmarshaledText},
1746 })
1747
1748 uc.updateChannelAutoDetach(upstreamName)
1749 }
1750 case "TAGMSG":
1751 var targetsStr string
1752 if err := parseMessageParams(msg, &targetsStr); err != nil {
1753 return err
1754 }
1755 tags := copyClientTags(msg.Tags)
1756
1757 for _, name := range strings.Split(targetsStr, ",") {
1758 uc, upstreamName, err := dc.unmarshalEntity(name)
1759 if err != nil {
1760 return err
1761 }
1762 if _, ok := uc.caps["message-tags"]; !ok {
1763 continue
1764 }
1765
1766 uc.SendMessageLabeled(dc.id, &irc.Message{
1767 Tags: tags,
1768 Command: "TAGMSG",
1769 Params: []string{upstreamName},
1770 })
1771
1772 uc.updateChannelAutoDetach(upstreamName)
1773 }
1774 case "INVITE":
1775 var user, channel string
1776 if err := parseMessageParams(msg, &user, &channel); err != nil {
1777 return err
1778 }
1779
1780 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1781 if err != nil {
1782 return err
1783 }
1784
1785 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1786 if err != nil {
1787 return err
1788 }
1789
1790 if ucChannel != ucUser {
1791 return ircError{&irc.Message{
1792 Command: irc.ERR_USERNOTINCHANNEL,
1793 Params: []string{dc.nick, user, channel, "They are on another network"},
1794 }}
1795 }
1796 uc := ucChannel
1797
1798 uc.SendMessageLabeled(dc.id, &irc.Message{
1799 Command: "INVITE",
1800 Params: []string{upstreamUser, upstreamChannel},
1801 })
1802 case "CHATHISTORY":
1803 var subcommand string
1804 if err := parseMessageParams(msg, &subcommand); err != nil {
1805 return err
1806 }
1807 var target, limitStr string
1808 var boundsStr [2]string
1809 switch subcommand {
1810 case "AFTER", "BEFORE":
1811 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
1812 return err
1813 }
1814 case "BETWEEN":
1815 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
1816 return err
1817 }
1818 default:
1819 // TODO: support LATEST, AROUND
1820 return ircError{&irc.Message{
1821 Command: "FAIL",
1822 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
1823 }}
1824 }
1825
1826 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1827 if !ok {
1828 return ircError{&irc.Message{
1829 Command: irc.ERR_UNKNOWNCOMMAND,
1830 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
1831 }}
1832 }
1833
1834 uc, entity, err := dc.unmarshalEntity(target)
1835 if err != nil {
1836 return err
1837 }
1838 entity = uc.network.casemap(entity)
1839
1840 // TODO: support msgid criteria
1841 var bounds [2]time.Time
1842 bounds[0] = parseChatHistoryBound(boundsStr[0])
1843 if bounds[0].IsZero() {
1844 return ircError{&irc.Message{
1845 Command: "FAIL",
1846 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
1847 }}
1848 }
1849
1850 if boundsStr[1] != "" {
1851 bounds[1] = parseChatHistoryBound(boundsStr[1])
1852 if bounds[1].IsZero() {
1853 return ircError{&irc.Message{
1854 Command: "FAIL",
1855 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
1856 }}
1857 }
1858 }
1859
1860 limit, err := strconv.Atoi(limitStr)
1861 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1862 return ircError{&irc.Message{
1863 Command: "FAIL",
1864 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
1865 }}
1866 }
1867
1868 var history []*irc.Message
1869 switch subcommand {
1870 case "BEFORE":
1871 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], time.Time{}, limit)
1872 case "AFTER":
1873 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], time.Now(), limit)
1874 case "BETWEEN":
1875 if bounds[0].Before(bounds[1]) {
1876 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], bounds[1], limit)
1877 } else {
1878 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], bounds[1], limit)
1879 }
1880 }
1881 if err != nil {
1882 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
1883 return newChatHistoryError(subcommand, target)
1884 }
1885
1886 batchRef := "history"
1887 dc.SendMessage(&irc.Message{
1888 Prefix: dc.srv.prefix(),
1889 Command: "BATCH",
1890 Params: []string{"+" + batchRef, "chathistory", target},
1891 })
1892
1893 for _, msg := range history {
1894 msg.Tags["batch"] = irc.TagValue(batchRef)
1895 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1896 }
1897
1898 dc.SendMessage(&irc.Message{
1899 Prefix: dc.srv.prefix(),
1900 Command: "BATCH",
1901 Params: []string{"-" + batchRef},
1902 })
1903 default:
1904 dc.logger.Printf("unhandled message: %v", msg)
1905 return newUnknownCommandError(msg.Command)
1906 }
1907 return nil
1908}
1909
1910func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1911 username, password, ok := parseNickServCredentials(text, uc.nick)
1912 if !ok {
1913 return
1914 }
1915
1916 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1917 // automatically erase the key pair or any other credentials.
1918 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1919 return
1920 }
1921
1922 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1923 n := uc.network
1924 n.SASL.Mechanism = "PLAIN"
1925 n.SASL.Plain.Username = username
1926 n.SASL.Plain.Password = password
1927 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1928 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1929 }
1930}
1931
1932func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1933 fields := strings.Fields(text)
1934 if len(fields) < 2 {
1935 return "", "", false
1936 }
1937 cmd := strings.ToUpper(fields[0])
1938 params := fields[1:]
1939 switch cmd {
1940 case "REGISTER":
1941 username = nick
1942 password = params[0]
1943 case "IDENTIFY":
1944 if len(params) == 1 {
1945 username = nick
1946 password = params[0]
1947 } else {
1948 username = params[0]
1949 password = params[1]
1950 }
1951 case "SET":
1952 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1953 username = nick
1954 password = params[1]
1955 }
1956 default:
1957 return "", "", false
1958 }
1959 return username, password, true
1960}
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