source: code/trunk/downstream.go@ 541

Last change on this file since 541 was 540, checked in by contact, 4 years ago

Add support for IRCv3 setname

References: ​https://todo.sr.ht/~emersion/soju/41
File size: 57.7 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60func parseBouncerNetID(subcommand, s string) (int64, error) {
61 id, err := strconv.ParseInt(s, 10, 64)
62 if err != nil {
63 return 0, ircError{&irc.Message{
64 Command: "FAIL",
65 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
66 }}
67 }
68 return id, nil
69}
70
71func getNetworkAttrs(network *network) irc.Tags {
72 state := "disconnected"
73 if uc := network.conn; uc != nil {
74 state = "connected"
75 }
76
77 attrs := irc.Tags{
78 "name": irc.TagValue(network.GetName()),
79 "state": irc.TagValue(state),
80 "nickname": irc.TagValue(network.Nick),
81 }
82
83 if network.Username != "" {
84 attrs["username"] = irc.TagValue(network.Username)
85 }
86 if network.Realname != "" {
87 attrs["realname"] = irc.TagValue(network.Realname)
88 }
89
90 if u, err := network.URL(); err == nil {
91 hasHostPort := true
92 switch u.Scheme {
93 case "ircs":
94 attrs["tls"] = irc.TagValue("1")
95 case "irc+insecure":
96 attrs["tls"] = irc.TagValue("0")
97 default:
98 hasHostPort = false
99 }
100 if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
101 attrs["host"] = irc.TagValue(host)
102 attrs["port"] = irc.TagValue(port)
103 } else if hasHostPort {
104 attrs["host"] = irc.TagValue(u.Host)
105 }
106 }
107
108 return attrs
109}
110
111// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
112// '*' and '?' break masks
113const illegalNickChars = " :@!*?"
114
115// permanentDownstreamCaps is the list of always-supported downstream
116// capabilities.
117var permanentDownstreamCaps = map[string]string{
118 "batch": "",
119 "cap-notify": "",
120 "echo-message": "",
121 "invite-notify": "",
122 "message-tags": "",
123 "sasl": "PLAIN",
124 "server-time": "",
125 "setname": "",
126
127 "soju.im/bouncer-networks": "",
128 "soju.im/bouncer-networks-notify": "",
129}
130
131// needAllDownstreamCaps is the list of downstream capabilities that
132// require support from all upstreams to be enabled
133var needAllDownstreamCaps = map[string]string{
134 "away-notify": "",
135 "extended-join": "",
136 "multi-prefix": "",
137}
138
139// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
140// through from the upstream server to downstream clients.
141//
142// This is only effective in single-upstream mode.
143var passthroughIsupport = map[string]bool{
144 "AWAYLEN": true,
145 "BOT": true,
146 "CHANLIMIT": true,
147 "CHANMODES": true,
148 "CHANNELLEN": true,
149 "CHANTYPES": true,
150 "EXCEPTS": true,
151 "EXTBAN": true,
152 "HOSTLEN": true,
153 "INVEX": true,
154 "KICKLEN": true,
155 "MAXLIST": true,
156 "MAXTARGETS": true,
157 "MODES": true,
158 "NAMELEN": true,
159 "NETWORK": true,
160 "NICKLEN": true,
161 "PREFIX": true,
162 "SAFELIST": true,
163 "TARGMAX": true,
164 "TOPICLEN": true,
165 "USERLEN": true,
166}
167
168type downstreamConn struct {
169 conn
170
171 id uint64
172
173 registered bool
174 user *user
175 nick string
176 nickCM string
177 rawUsername string
178 networkName string
179 clientName string
180 realname string
181 hostname string
182 password string // empty after authentication
183 network *network // can be nil
184
185 negociatingCaps bool
186 capVersion int
187 supportedCaps map[string]string
188 caps map[string]bool
189
190 saslServer sasl.Server
191}
192
193func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
194 remoteAddr := ic.RemoteAddr().String()
195 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
196 options := connOptions{Logger: logger}
197 dc := &downstreamConn{
198 conn: *newConn(srv, ic, &options),
199 id: id,
200 supportedCaps: make(map[string]string),
201 caps: make(map[string]bool),
202 }
203 dc.hostname = remoteAddr
204 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
205 dc.hostname = host
206 }
207 for k, v := range permanentDownstreamCaps {
208 dc.supportedCaps[k] = v
209 }
210 if srv.LogPath != "" {
211 dc.supportedCaps["draft/chathistory"] = ""
212 }
213 return dc
214}
215
216func (dc *downstreamConn) prefix() *irc.Prefix {
217 return &irc.Prefix{
218 Name: dc.nick,
219 User: dc.user.Username,
220 Host: dc.hostname,
221 }
222}
223
224func (dc *downstreamConn) forEachNetwork(f func(*network)) {
225 if dc.network != nil {
226 f(dc.network)
227 } else if !dc.caps["soju.im/bouncer-networks"] {
228 dc.user.forEachNetwork(f)
229 }
230}
231
232func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
233 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
234 return
235 }
236 dc.user.forEachUpstream(func(uc *upstreamConn) {
237 if dc.network != nil && uc.network != dc.network {
238 return
239 }
240 f(uc)
241 })
242}
243
244// upstream returns the upstream connection, if any. If there are zero or if
245// there are multiple upstream connections, it returns nil.
246func (dc *downstreamConn) upstream() *upstreamConn {
247 if dc.network == nil {
248 return nil
249 }
250 return dc.network.conn
251}
252
253func isOurNick(net *network, nick string) bool {
254 // TODO: this doesn't account for nick changes
255 if net.conn != nil {
256 return net.casemap(nick) == net.conn.nickCM
257 }
258 // We're not currently connected to the upstream connection, so we don't
259 // know whether this name is our nickname. Best-effort: use the network's
260 // configured nickname and hope it was the one being used when we were
261 // connected.
262 return net.casemap(nick) == net.casemap(net.Nick)
263}
264
265// marshalEntity converts an upstream entity name (ie. channel or nick) into a
266// downstream entity name.
267//
268// This involves adding a "/<network>" suffix if the entity isn't the current
269// user.
270func (dc *downstreamConn) marshalEntity(net *network, name string) string {
271 if isOurNick(net, name) {
272 return dc.nick
273 }
274 name = partialCasemap(net.casemap, name)
275 if dc.network != nil {
276 if dc.network != net {
277 panic("soju: tried to marshal an entity for another network")
278 }
279 return name
280 }
281 return name + "/" + net.GetName()
282}
283
284func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
285 if isOurNick(net, prefix.Name) {
286 return dc.prefix()
287 }
288 prefix.Name = partialCasemap(net.casemap, prefix.Name)
289 if dc.network != nil {
290 if dc.network != net {
291 panic("soju: tried to marshal a user prefix for another network")
292 }
293 return prefix
294 }
295 return &irc.Prefix{
296 Name: prefix.Name + "/" + net.GetName(),
297 User: prefix.User,
298 Host: prefix.Host,
299 }
300}
301
302// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
303// an upstream entity name.
304//
305// This involves removing the "/<network>" suffix.
306func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
307 if uc := dc.upstream(); uc != nil {
308 return uc, name, nil
309 }
310 if dc.network != nil {
311 return nil, "", ircError{&irc.Message{
312 Command: irc.ERR_NOSUCHCHANNEL,
313 Params: []string{name, "Disconnected from upstream network"},
314 }}
315 }
316
317 var conn *upstreamConn
318 if i := strings.LastIndexByte(name, '/'); i >= 0 {
319 network := name[i+1:]
320 name = name[:i]
321
322 dc.forEachUpstream(func(uc *upstreamConn) {
323 if network != uc.network.GetName() {
324 return
325 }
326 conn = uc
327 })
328 }
329
330 if conn == nil {
331 return nil, "", ircError{&irc.Message{
332 Command: irc.ERR_NOSUCHCHANNEL,
333 Params: []string{name, "Missing network suffix in channel name"},
334 }}
335 }
336 return conn, name, nil
337}
338
339func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
340 if dc.upstream() != nil {
341 return text
342 }
343 // TODO: smarter parsing that ignores URLs
344 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
345}
346
347func (dc *downstreamConn) readMessages(ch chan<- event) error {
348 for {
349 msg, err := dc.ReadMessage()
350 if err == io.EOF {
351 break
352 } else if err != nil {
353 return fmt.Errorf("failed to read IRC command: %v", err)
354 }
355
356 ch <- eventDownstreamMessage{msg, dc}
357 }
358
359 return nil
360}
361
362// SendMessage sends an outgoing message.
363//
364// This can only called from the user goroutine.
365func (dc *downstreamConn) SendMessage(msg *irc.Message) {
366 if !dc.caps["message-tags"] {
367 if msg.Command == "TAGMSG" {
368 return
369 }
370 msg = msg.Copy()
371 for name := range msg.Tags {
372 supported := false
373 switch name {
374 case "time":
375 supported = dc.caps["server-time"]
376 }
377 if !supported {
378 delete(msg.Tags, name)
379 }
380 }
381 }
382 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
383 msg.Params = msg.Params[:1]
384 }
385 if msg.Command == "SETNAME" && !dc.caps["setname"] {
386 return
387 }
388
389 dc.conn.SendMessage(msg)
390}
391
392// sendMessageWithID sends an outgoing message with the specified internal ID.
393func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
394 dc.SendMessage(msg)
395
396 if id == "" || !dc.messageSupportsHistory(msg) {
397 return
398 }
399
400 dc.sendPing(id)
401}
402
403// advanceMessageWithID advances history to the specified message ID without
404// sending a message. This is useful e.g. for self-messages when echo-message
405// isn't enabled.
406func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
407 if id == "" || !dc.messageSupportsHistory(msg) {
408 return
409 }
410
411 dc.sendPing(id)
412}
413
414// ackMsgID acknowledges that a message has been received.
415func (dc *downstreamConn) ackMsgID(id string) {
416 netID, entity, err := parseMsgID(id, nil)
417 if err != nil {
418 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
419 return
420 }
421
422 network := dc.user.getNetworkByID(netID)
423 if network == nil {
424 return
425 }
426
427 network.delivered.StoreID(entity, dc.clientName, id)
428}
429
430func (dc *downstreamConn) sendPing(msgID string) {
431 token := "soju-msgid-" + msgID
432 dc.SendMessage(&irc.Message{
433 Command: "PING",
434 Params: []string{token},
435 })
436}
437
438func (dc *downstreamConn) handlePong(token string) {
439 if !strings.HasPrefix(token, "soju-msgid-") {
440 dc.logger.Printf("received unrecognized PONG token %q", token)
441 return
442 }
443 msgID := strings.TrimPrefix(token, "soju-msgid-")
444 dc.ackMsgID(msgID)
445}
446
447// marshalMessage re-formats a message coming from an upstream connection so
448// that it's suitable for being sent on this downstream connection. Only
449// messages that may appear in logs are supported, except MODE.
450func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
451 msg = msg.Copy()
452 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
453
454 switch msg.Command {
455 case "PRIVMSG", "NOTICE", "TAGMSG":
456 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
457 case "NICK":
458 // Nick change for another user
459 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
460 case "JOIN", "PART":
461 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
462 case "KICK":
463 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
464 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
465 case "TOPIC":
466 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
467 case "QUIT", "SETNAME":
468 // This space is intentionally left blank
469 default:
470 panic(fmt.Sprintf("unexpected %q message", msg.Command))
471 }
472
473 return msg
474}
475
476func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
477 switch msg.Command {
478 case "QUIT":
479 return dc.Close()
480 default:
481 if dc.registered {
482 return dc.handleMessageRegistered(msg)
483 } else {
484 return dc.handleMessageUnregistered(msg)
485 }
486 }
487}
488
489func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
490 switch msg.Command {
491 case "NICK":
492 var nick string
493 if err := parseMessageParams(msg, &nick); err != nil {
494 return err
495 }
496 if strings.ContainsAny(nick, illegalNickChars) {
497 return ircError{&irc.Message{
498 Command: irc.ERR_ERRONEUSNICKNAME,
499 Params: []string{dc.nick, nick, "contains illegal characters"},
500 }}
501 }
502 nickCM := casemapASCII(nick)
503 if nickCM == serviceNickCM {
504 return ircError{&irc.Message{
505 Command: irc.ERR_NICKNAMEINUSE,
506 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
507 }}
508 }
509 dc.nick = nick
510 dc.nickCM = nickCM
511 case "USER":
512 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
513 return err
514 }
515 case "PASS":
516 if err := parseMessageParams(msg, &dc.password); err != nil {
517 return err
518 }
519 case "CAP":
520 var subCmd string
521 if err := parseMessageParams(msg, &subCmd); err != nil {
522 return err
523 }
524 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
525 return err
526 }
527 case "AUTHENTICATE":
528 if !dc.caps["sasl"] {
529 return ircError{&irc.Message{
530 Command: irc.ERR_SASLFAIL,
531 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
532 }}
533 }
534 if len(msg.Params) == 0 {
535 return ircError{&irc.Message{
536 Command: irc.ERR_SASLFAIL,
537 Params: []string{"*", "Missing AUTHENTICATE argument"},
538 }}
539 }
540 if dc.nick == "" {
541 return ircError{&irc.Message{
542 Command: irc.ERR_SASLFAIL,
543 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
544 }}
545 }
546
547 var resp []byte
548 if dc.saslServer == nil {
549 mech := strings.ToUpper(msg.Params[0])
550 switch mech {
551 case "PLAIN":
552 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
553 return dc.authenticate(username, password)
554 }))
555 default:
556 return ircError{&irc.Message{
557 Command: irc.ERR_SASLFAIL,
558 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
559 }}
560 }
561 } else if msg.Params[0] == "*" {
562 dc.saslServer = nil
563 return ircError{&irc.Message{
564 Command: irc.ERR_SASLABORTED,
565 Params: []string{"*", "SASL authentication aborted"},
566 }}
567 } else if msg.Params[0] == "+" {
568 resp = nil
569 } else {
570 // TODO: multi-line messages
571 var err error
572 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
573 if err != nil {
574 dc.saslServer = nil
575 return ircError{&irc.Message{
576 Command: irc.ERR_SASLFAIL,
577 Params: []string{"*", "Invalid base64-encoded response"},
578 }}
579 }
580 }
581
582 challenge, done, err := dc.saslServer.Next(resp)
583 if err != nil {
584 dc.saslServer = nil
585 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
586 return ircError{&irc.Message{
587 Command: irc.ERR_SASLFAIL,
588 Params: []string{"*", ircErr.Message.Params[1]},
589 }}
590 }
591 dc.SendMessage(&irc.Message{
592 Prefix: dc.srv.prefix(),
593 Command: irc.ERR_SASLFAIL,
594 Params: []string{"*", "SASL error"},
595 })
596 return fmt.Errorf("SASL authentication failed: %v", err)
597 } else if done {
598 dc.saslServer = nil
599 dc.SendMessage(&irc.Message{
600 Prefix: dc.srv.prefix(),
601 Command: irc.RPL_LOGGEDIN,
602 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
603 })
604 dc.SendMessage(&irc.Message{
605 Prefix: dc.srv.prefix(),
606 Command: irc.RPL_SASLSUCCESS,
607 Params: []string{dc.nick, "SASL authentication successful"},
608 })
609 } else {
610 challengeStr := "+"
611 if len(challenge) > 0 {
612 challengeStr = base64.StdEncoding.EncodeToString(challenge)
613 }
614
615 // TODO: multi-line messages
616 dc.SendMessage(&irc.Message{
617 Prefix: dc.srv.prefix(),
618 Command: "AUTHENTICATE",
619 Params: []string{challengeStr},
620 })
621 }
622 case "BOUNCER":
623 var subcommand string
624 if err := parseMessageParams(msg, &subcommand); err != nil {
625 return err
626 }
627
628 switch strings.ToUpper(subcommand) {
629 case "BIND":
630 var idStr string
631 if err := parseMessageParams(msg, nil, &idStr); err != nil {
632 return err
633 }
634
635 if dc.registered {
636 return ircError{&irc.Message{
637 Command: "FAIL",
638 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind bouncer network after registration"},
639 }}
640 }
641 if dc.user == nil {
642 return ircError{&irc.Message{
643 Command: "FAIL",
644 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
645 }}
646 }
647
648 id, err := parseBouncerNetID(subcommand, idStr)
649 if err != nil {
650 return err
651 }
652
653 var match *network
654 dc.user.forEachNetwork(func(net *network) {
655 if net.ID == id {
656 match = net
657 }
658 })
659 if match == nil {
660 return ircError{&irc.Message{
661 Command: "FAIL",
662 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
663 }}
664 }
665
666 dc.networkName = match.GetName()
667 }
668 default:
669 dc.logger.Printf("unhandled message: %v", msg)
670 return newUnknownCommandError(msg.Command)
671 }
672 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
673 return dc.register()
674 }
675 return nil
676}
677
678func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
679 cmd = strings.ToUpper(cmd)
680
681 replyTo := dc.nick
682 if !dc.registered {
683 replyTo = "*"
684 }
685
686 switch cmd {
687 case "LS":
688 if len(args) > 0 {
689 var err error
690 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
691 return err
692 }
693 }
694 if !dc.registered && dc.capVersion >= 302 {
695 // Let downstream show everything it supports, and trim
696 // down the available capabilities when upstreams are
697 // known.
698 for k, v := range needAllDownstreamCaps {
699 dc.supportedCaps[k] = v
700 }
701 }
702
703 caps := make([]string, 0, len(dc.supportedCaps))
704 for k, v := range dc.supportedCaps {
705 if dc.capVersion >= 302 && v != "" {
706 caps = append(caps, k+"="+v)
707 } else {
708 caps = append(caps, k)
709 }
710 }
711
712 // TODO: multi-line replies
713 dc.SendMessage(&irc.Message{
714 Prefix: dc.srv.prefix(),
715 Command: "CAP",
716 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
717 })
718
719 if dc.capVersion >= 302 {
720 // CAP version 302 implicitly enables cap-notify
721 dc.caps["cap-notify"] = true
722 }
723
724 if !dc.registered {
725 dc.negociatingCaps = true
726 }
727 case "LIST":
728 var caps []string
729 for name, enabled := range dc.caps {
730 if enabled {
731 caps = append(caps, name)
732 }
733 }
734
735 // TODO: multi-line replies
736 dc.SendMessage(&irc.Message{
737 Prefix: dc.srv.prefix(),
738 Command: "CAP",
739 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
740 })
741 case "REQ":
742 if len(args) == 0 {
743 return ircError{&irc.Message{
744 Command: err_invalidcapcmd,
745 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
746 }}
747 }
748
749 // TODO: atomically ack/nak the whole capability set
750 caps := strings.Fields(args[0])
751 ack := true
752 for _, name := range caps {
753 name = strings.ToLower(name)
754 enable := !strings.HasPrefix(name, "-")
755 if !enable {
756 name = strings.TrimPrefix(name, "-")
757 }
758
759 if enable == dc.caps[name] {
760 continue
761 }
762
763 _, ok := dc.supportedCaps[name]
764 if !ok {
765 ack = false
766 break
767 }
768
769 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
770 // cap-notify cannot be disabled with CAP version 302
771 ack = false
772 break
773 }
774
775 dc.caps[name] = enable
776 }
777
778 reply := "NAK"
779 if ack {
780 reply = "ACK"
781 }
782 dc.SendMessage(&irc.Message{
783 Prefix: dc.srv.prefix(),
784 Command: "CAP",
785 Params: []string{replyTo, reply, args[0]},
786 })
787 case "END":
788 dc.negociatingCaps = false
789 default:
790 return ircError{&irc.Message{
791 Command: err_invalidcapcmd,
792 Params: []string{replyTo, cmd, "Unknown CAP command"},
793 }}
794 }
795 return nil
796}
797
798func (dc *downstreamConn) setSupportedCap(name, value string) {
799 prevValue, hasPrev := dc.supportedCaps[name]
800 changed := !hasPrev || prevValue != value
801 dc.supportedCaps[name] = value
802
803 if !dc.caps["cap-notify"] || !changed {
804 return
805 }
806
807 replyTo := dc.nick
808 if !dc.registered {
809 replyTo = "*"
810 }
811
812 cap := name
813 if value != "" && dc.capVersion >= 302 {
814 cap = name + "=" + value
815 }
816
817 dc.SendMessage(&irc.Message{
818 Prefix: dc.srv.prefix(),
819 Command: "CAP",
820 Params: []string{replyTo, "NEW", cap},
821 })
822}
823
824func (dc *downstreamConn) unsetSupportedCap(name string) {
825 _, hasPrev := dc.supportedCaps[name]
826 delete(dc.supportedCaps, name)
827 delete(dc.caps, name)
828
829 if !dc.caps["cap-notify"] || !hasPrev {
830 return
831 }
832
833 replyTo := dc.nick
834 if !dc.registered {
835 replyTo = "*"
836 }
837
838 dc.SendMessage(&irc.Message{
839 Prefix: dc.srv.prefix(),
840 Command: "CAP",
841 Params: []string{replyTo, "DEL", name},
842 })
843}
844
845func (dc *downstreamConn) updateSupportedCaps() {
846 supportedCaps := make(map[string]bool)
847 for cap := range needAllDownstreamCaps {
848 supportedCaps[cap] = true
849 }
850 dc.forEachUpstream(func(uc *upstreamConn) {
851 for cap, supported := range supportedCaps {
852 supportedCaps[cap] = supported && uc.caps[cap]
853 }
854 })
855
856 for cap, supported := range supportedCaps {
857 if supported {
858 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
859 } else {
860 dc.unsetSupportedCap(cap)
861 }
862 }
863}
864
865func (dc *downstreamConn) updateNick() {
866 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
867 dc.SendMessage(&irc.Message{
868 Prefix: dc.prefix(),
869 Command: "NICK",
870 Params: []string{uc.nick},
871 })
872 dc.nick = uc.nick
873 dc.nickCM = casemapASCII(dc.nick)
874 }
875}
876
877func (dc *downstreamConn) updateRealname() {
878 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
879 dc.SendMessage(&irc.Message{
880 Prefix: dc.prefix(),
881 Command: "SETNAME",
882 Params: []string{uc.realname},
883 })
884 dc.realname = uc.realname
885 }
886}
887
888func sanityCheckServer(addr string) error {
889 dialer := net.Dialer{Timeout: 30 * time.Second}
890 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
891 if err != nil {
892 return err
893 }
894 return conn.Close()
895}
896
897func unmarshalUsername(rawUsername string) (username, client, network string) {
898 username = rawUsername
899
900 i := strings.IndexAny(username, "/@")
901 j := strings.LastIndexAny(username, "/@")
902 if i >= 0 {
903 username = rawUsername[:i]
904 }
905 if j >= 0 {
906 if rawUsername[j] == '@' {
907 client = rawUsername[j+1:]
908 } else {
909 network = rawUsername[j+1:]
910 }
911 }
912 if i >= 0 && j >= 0 && i < j {
913 if rawUsername[i] == '@' {
914 client = rawUsername[i+1 : j]
915 } else {
916 network = rawUsername[i+1 : j]
917 }
918 }
919
920 return username, client, network
921}
922
923func (dc *downstreamConn) authenticate(username, password string) error {
924 username, clientName, networkName := unmarshalUsername(username)
925
926 u, err := dc.srv.db.GetUser(username)
927 if err != nil {
928 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
929 return errAuthFailed
930 }
931
932 // Password auth disabled
933 if u.Password == "" {
934 return errAuthFailed
935 }
936
937 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
938 if err != nil {
939 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
940 return errAuthFailed
941 }
942
943 dc.user = dc.srv.getUser(username)
944 if dc.user == nil {
945 dc.logger.Printf("failed authentication for %q: user not active", username)
946 return errAuthFailed
947 }
948 dc.clientName = clientName
949 dc.networkName = networkName
950 return nil
951}
952
953func (dc *downstreamConn) register() error {
954 if dc.registered {
955 return fmt.Errorf("tried to register twice")
956 }
957
958 password := dc.password
959 dc.password = ""
960 if dc.user == nil {
961 if err := dc.authenticate(dc.rawUsername, password); err != nil {
962 return err
963 }
964 }
965
966 if dc.clientName == "" && dc.networkName == "" {
967 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
968 }
969
970 dc.registered = true
971 dc.logger.Printf("registration complete for user %q", dc.user.Username)
972 return nil
973}
974
975func (dc *downstreamConn) loadNetwork() error {
976 if dc.networkName == "" {
977 return nil
978 }
979
980 network := dc.user.getNetwork(dc.networkName)
981 if network == nil {
982 addr := dc.networkName
983 if !strings.ContainsRune(addr, ':') {
984 addr = addr + ":6697"
985 }
986
987 dc.logger.Printf("trying to connect to new network %q", addr)
988 if err := sanityCheckServer(addr); err != nil {
989 dc.logger.Printf("failed to connect to %q: %v", addr, err)
990 return ircError{&irc.Message{
991 Command: irc.ERR_PASSWDMISMATCH,
992 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
993 }}
994 }
995
996 // Some clients only allow specifying the nickname (and use the
997 // nickname as a username too). Strip the network name from the
998 // nickname when auto-saving networks.
999 nick, _, _ := unmarshalUsername(dc.nick)
1000
1001 dc.logger.Printf("auto-saving network %q", dc.networkName)
1002 var err error
1003 network, err = dc.user.createNetwork(&Network{
1004 Addr: dc.networkName,
1005 Nick: nick,
1006 })
1007 if err != nil {
1008 return err
1009 }
1010 }
1011
1012 dc.network = network
1013 return nil
1014}
1015
1016func (dc *downstreamConn) welcome() error {
1017 if dc.user == nil || !dc.registered {
1018 panic("tried to welcome an unregistered connection")
1019 }
1020
1021 // TODO: doing this might take some time. We should do it in dc.register
1022 // instead, but we'll potentially be adding a new network and this must be
1023 // done in the user goroutine.
1024 if err := dc.loadNetwork(); err != nil {
1025 return err
1026 }
1027
1028 isupport := []string{
1029 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
1030 "CASEMAPPING=ascii",
1031 }
1032
1033 if dc.network != nil {
1034 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1035 }
1036
1037 if uc := dc.upstream(); uc != nil {
1038 for k := range passthroughIsupport {
1039 v, ok := uc.isupport[k]
1040 if !ok {
1041 continue
1042 }
1043 if v != nil {
1044 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1045 } else {
1046 isupport = append(isupport, k)
1047 }
1048 }
1049 }
1050
1051 dc.SendMessage(&irc.Message{
1052 Prefix: dc.srv.prefix(),
1053 Command: irc.RPL_WELCOME,
1054 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1055 })
1056 dc.SendMessage(&irc.Message{
1057 Prefix: dc.srv.prefix(),
1058 Command: irc.RPL_YOURHOST,
1059 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1060 })
1061 dc.SendMessage(&irc.Message{
1062 Prefix: dc.srv.prefix(),
1063 Command: irc.RPL_CREATED,
1064 Params: []string{dc.nick, "Who cares when the server was created?"},
1065 })
1066 dc.SendMessage(&irc.Message{
1067 Prefix: dc.srv.prefix(),
1068 Command: irc.RPL_MYINFO,
1069 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1070 })
1071 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1072 dc.SendMessage(msg)
1073 }
1074 dc.SendMessage(&irc.Message{
1075 Prefix: dc.srv.prefix(),
1076 Command: irc.ERR_NOMOTD,
1077 Params: []string{dc.nick, "No MOTD"},
1078 })
1079
1080 dc.updateNick()
1081 dc.updateRealname()
1082 dc.updateSupportedCaps()
1083
1084 if dc.caps["soju.im/bouncer-networks-notify"] {
1085 dc.SendMessage(&irc.Message{
1086 Prefix: dc.srv.prefix(),
1087 Command: "BATCH",
1088 Params: []string{"+networks", "soju.im/bouncer-networks"},
1089 })
1090 dc.user.forEachNetwork(func(network *network) {
1091 idStr := fmt.Sprintf("%v", network.ID)
1092 attrs := getNetworkAttrs(network)
1093 dc.SendMessage(&irc.Message{
1094 Tags: irc.Tags{"batch": irc.TagValue("networks")},
1095 Prefix: dc.srv.prefix(),
1096 Command: "BOUNCER",
1097 Params: []string{"NETWORK", idStr, attrs.String()},
1098 })
1099 })
1100 dc.SendMessage(&irc.Message{
1101 Prefix: dc.srv.prefix(),
1102 Command: "BATCH",
1103 Params: []string{"-networks"},
1104 })
1105 }
1106
1107 dc.forEachUpstream(func(uc *upstreamConn) {
1108 for _, entry := range uc.channels.innerMap {
1109 ch := entry.value.(*upstreamChannel)
1110 if !ch.complete {
1111 continue
1112 }
1113 record := uc.network.channels.Value(ch.Name)
1114 if record != nil && record.Detached {
1115 continue
1116 }
1117
1118 dc.SendMessage(&irc.Message{
1119 Prefix: dc.prefix(),
1120 Command: "JOIN",
1121 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1122 })
1123
1124 forwardChannel(dc, ch)
1125 }
1126 })
1127
1128 dc.forEachNetwork(func(net *network) {
1129 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1130 return
1131 }
1132
1133 // Only send history if we're the first connected client with that name
1134 // for the network
1135 firstClient := true
1136 dc.user.forEachDownstream(func(c *downstreamConn) {
1137 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1138 firstClient = false
1139 }
1140 })
1141 if firstClient {
1142 net.delivered.ForEachTarget(func(target string) {
1143 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1144 if lastDelivered == "" {
1145 return
1146 }
1147
1148 dc.sendTargetBacklog(net, target, lastDelivered)
1149
1150 // Fast-forward history to last message
1151 targetCM := net.casemap(target)
1152 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1153 if err != nil {
1154 dc.logger.Printf("failed to get last message ID: %v", err)
1155 return
1156 }
1157 net.delivered.StoreID(target, dc.clientName, lastID)
1158 })
1159 }
1160 })
1161
1162 return nil
1163}
1164
1165// messageSupportsHistory checks whether the provided message can be sent as
1166// part of an history batch.
1167func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1168 // Don't replay all messages, because that would mess up client
1169 // state. For instance we just sent the list of users, sending
1170 // PART messages for one of these users would be incorrect.
1171 // TODO: add support for draft/event-playback
1172 switch msg.Command {
1173 case "PRIVMSG", "NOTICE":
1174 return true
1175 }
1176 return false
1177}
1178
1179func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1180 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1181 return
1182 }
1183
1184 ch := net.channels.Value(target)
1185
1186 limit := 4000
1187 targetCM := net.casemap(target)
1188 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1189 if err != nil {
1190 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1191 return
1192 }
1193
1194 batchRef := "history"
1195 if dc.caps["batch"] {
1196 dc.SendMessage(&irc.Message{
1197 Prefix: dc.srv.prefix(),
1198 Command: "BATCH",
1199 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1200 })
1201 }
1202
1203 for _, msg := range history {
1204 if !dc.messageSupportsHistory(msg) {
1205 continue
1206 }
1207
1208 if ch != nil && ch.Detached {
1209 if net.detachedMessageNeedsRelay(ch, msg) {
1210 dc.relayDetachedMessage(net, msg)
1211 }
1212 } else {
1213 if dc.caps["batch"] {
1214 msg.Tags["batch"] = irc.TagValue(batchRef)
1215 }
1216 dc.SendMessage(dc.marshalMessage(msg, net))
1217 }
1218 }
1219
1220 if dc.caps["batch"] {
1221 dc.SendMessage(&irc.Message{
1222 Prefix: dc.srv.prefix(),
1223 Command: "BATCH",
1224 Params: []string{"-" + batchRef},
1225 })
1226 }
1227}
1228
1229func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1230 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1231 return
1232 }
1233
1234 sender := msg.Prefix.Name
1235 target, text := msg.Params[0], msg.Params[1]
1236 if net.isHighlight(msg) {
1237 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1238 } else {
1239 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1240 }
1241}
1242
1243func (dc *downstreamConn) runUntilRegistered() error {
1244 for !dc.registered {
1245 msg, err := dc.ReadMessage()
1246 if err != nil {
1247 return fmt.Errorf("failed to read IRC command: %v", err)
1248 }
1249
1250 err = dc.handleMessage(msg)
1251 if ircErr, ok := err.(ircError); ok {
1252 ircErr.Message.Prefix = dc.srv.prefix()
1253 dc.SendMessage(ircErr.Message)
1254 } else if err != nil {
1255 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1256 }
1257 }
1258
1259 return nil
1260}
1261
1262func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1263 switch msg.Command {
1264 case "CAP":
1265 var subCmd string
1266 if err := parseMessageParams(msg, &subCmd); err != nil {
1267 return err
1268 }
1269 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1270 return err
1271 }
1272 case "PING":
1273 var source, destination string
1274 if err := parseMessageParams(msg, &source); err != nil {
1275 return err
1276 }
1277 if len(msg.Params) > 1 {
1278 destination = msg.Params[1]
1279 }
1280 if destination != "" && destination != dc.srv.Hostname {
1281 return ircError{&irc.Message{
1282 Command: irc.ERR_NOSUCHSERVER,
1283 Params: []string{dc.nick, destination, "No such server"},
1284 }}
1285 }
1286 dc.SendMessage(&irc.Message{
1287 Prefix: dc.srv.prefix(),
1288 Command: "PONG",
1289 Params: []string{dc.srv.Hostname, source},
1290 })
1291 return nil
1292 case "PONG":
1293 if len(msg.Params) == 0 {
1294 return newNeedMoreParamsError(msg.Command)
1295 }
1296 token := msg.Params[len(msg.Params)-1]
1297 dc.handlePong(token)
1298 case "USER":
1299 return ircError{&irc.Message{
1300 Command: irc.ERR_ALREADYREGISTERED,
1301 Params: []string{dc.nick, "You may not reregister"},
1302 }}
1303 case "NICK":
1304 var rawNick string
1305 if err := parseMessageParams(msg, &rawNick); err != nil {
1306 return err
1307 }
1308
1309 nick := rawNick
1310 var upstream *upstreamConn
1311 if dc.upstream() == nil {
1312 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1313 if err == nil { // NICK nick/network: NICK only on a specific upstream
1314 upstream = uc
1315 nick = unmarshaledNick
1316 }
1317 }
1318
1319 if strings.ContainsAny(nick, illegalNickChars) {
1320 return ircError{&irc.Message{
1321 Command: irc.ERR_ERRONEUSNICKNAME,
1322 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1323 }}
1324 }
1325 if casemapASCII(nick) == serviceNickCM {
1326 return ircError{&irc.Message{
1327 Command: irc.ERR_NICKNAMEINUSE,
1328 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1329 }}
1330 }
1331
1332 var err error
1333 dc.forEachNetwork(func(n *network) {
1334 if err != nil || (upstream != nil && upstream.network != n) {
1335 return
1336 }
1337 n.Nick = nick
1338 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1339 })
1340 if err != nil {
1341 return err
1342 }
1343
1344 dc.forEachUpstream(func(uc *upstreamConn) {
1345 if upstream != nil && upstream != uc {
1346 return
1347 }
1348 uc.SendMessageLabeled(dc.id, &irc.Message{
1349 Command: "NICK",
1350 Params: []string{nick},
1351 })
1352 })
1353
1354 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1355 dc.SendMessage(&irc.Message{
1356 Prefix: dc.prefix(),
1357 Command: "NICK",
1358 Params: []string{nick},
1359 })
1360 dc.nick = nick
1361 dc.nickCM = casemapASCII(dc.nick)
1362 }
1363 case "SETNAME":
1364 var realname string
1365 if err := parseMessageParams(msg, &realname); err != nil {
1366 return err
1367 }
1368
1369 var storeErr error
1370 var needUpdate []Network
1371 dc.forEachNetwork(func(n *network) {
1372 // We only need to call updateNetwork for upstreams that don't
1373 // support setname
1374 if uc := n.conn; uc != nil && uc.caps["setname"] {
1375 uc.SendMessageLabeled(dc.id, &irc.Message{
1376 Command: "SETNAME",
1377 Params: []string{realname},
1378 })
1379
1380 n.Realname = realname
1381 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1382 dc.logger.Printf("failed to store network realname: %v", err)
1383 storeErr = err
1384 }
1385 return
1386 }
1387
1388 record := n.Network // copy network record because we'll mutate it
1389 record.Realname = realname
1390 needUpdate = append(needUpdate, record)
1391 })
1392
1393 // Walk the network list as a second step, because updateNetwork
1394 // mutates the original list
1395 for _, record := range needUpdate {
1396 if _, err := dc.user.updateNetwork(&record); err != nil {
1397 dc.logger.Printf("failed to update network realname: %v", err)
1398 storeErr = err
1399 }
1400 }
1401 if storeErr != nil {
1402 return ircError{&irc.Message{
1403 Command: "FAIL",
1404 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1405 }}
1406 }
1407
1408 if dc.upstream() == nil && dc.caps["setname"] {
1409 dc.SendMessage(&irc.Message{
1410 Prefix: dc.prefix(),
1411 Command: "SETNAME",
1412 Params: []string{realname},
1413 })
1414 }
1415 case "JOIN":
1416 var namesStr string
1417 if err := parseMessageParams(msg, &namesStr); err != nil {
1418 return err
1419 }
1420
1421 var keys []string
1422 if len(msg.Params) > 1 {
1423 keys = strings.Split(msg.Params[1], ",")
1424 }
1425
1426 for i, name := range strings.Split(namesStr, ",") {
1427 uc, upstreamName, err := dc.unmarshalEntity(name)
1428 if err != nil {
1429 return err
1430 }
1431
1432 var key string
1433 if len(keys) > i {
1434 key = keys[i]
1435 }
1436
1437 params := []string{upstreamName}
1438 if key != "" {
1439 params = append(params, key)
1440 }
1441 uc.SendMessageLabeled(dc.id, &irc.Message{
1442 Command: "JOIN",
1443 Params: params,
1444 })
1445
1446 ch := uc.network.channels.Value(upstreamName)
1447 if ch != nil {
1448 // Don't clear the channel key if there's one set
1449 // TODO: add a way to unset the channel key
1450 if key != "" {
1451 ch.Key = key
1452 }
1453 uc.network.attach(ch)
1454 } else {
1455 ch = &Channel{
1456 Name: upstreamName,
1457 Key: key,
1458 }
1459 uc.network.channels.SetValue(upstreamName, ch)
1460 }
1461 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1462 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1463 }
1464 }
1465 case "PART":
1466 var namesStr string
1467 if err := parseMessageParams(msg, &namesStr); err != nil {
1468 return err
1469 }
1470
1471 var reason string
1472 if len(msg.Params) > 1 {
1473 reason = msg.Params[1]
1474 }
1475
1476 for _, name := range strings.Split(namesStr, ",") {
1477 uc, upstreamName, err := dc.unmarshalEntity(name)
1478 if err != nil {
1479 return err
1480 }
1481
1482 if strings.EqualFold(reason, "detach") {
1483 ch := uc.network.channels.Value(upstreamName)
1484 if ch != nil {
1485 uc.network.detach(ch)
1486 } else {
1487 ch = &Channel{
1488 Name: name,
1489 Detached: true,
1490 }
1491 uc.network.channels.SetValue(upstreamName, ch)
1492 }
1493 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1494 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1495 }
1496 } else {
1497 params := []string{upstreamName}
1498 if reason != "" {
1499 params = append(params, reason)
1500 }
1501 uc.SendMessageLabeled(dc.id, &irc.Message{
1502 Command: "PART",
1503 Params: params,
1504 })
1505
1506 if err := uc.network.deleteChannel(upstreamName); err != nil {
1507 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1508 }
1509 }
1510 }
1511 case "KICK":
1512 var channelStr, userStr string
1513 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1514 return err
1515 }
1516
1517 channels := strings.Split(channelStr, ",")
1518 users := strings.Split(userStr, ",")
1519
1520 var reason string
1521 if len(msg.Params) > 2 {
1522 reason = msg.Params[2]
1523 }
1524
1525 if len(channels) != 1 && len(channels) != len(users) {
1526 return ircError{&irc.Message{
1527 Command: irc.ERR_BADCHANMASK,
1528 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1529 }}
1530 }
1531
1532 for i, user := range users {
1533 var channel string
1534 if len(channels) == 1 {
1535 channel = channels[0]
1536 } else {
1537 channel = channels[i]
1538 }
1539
1540 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1541 if err != nil {
1542 return err
1543 }
1544
1545 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1546 if err != nil {
1547 return err
1548 }
1549
1550 if ucChannel != ucUser {
1551 return ircError{&irc.Message{
1552 Command: irc.ERR_USERNOTINCHANNEL,
1553 Params: []string{dc.nick, user, channel, "They are on another network"},
1554 }}
1555 }
1556 uc := ucChannel
1557
1558 params := []string{upstreamChannel, upstreamUser}
1559 if reason != "" {
1560 params = append(params, reason)
1561 }
1562 uc.SendMessageLabeled(dc.id, &irc.Message{
1563 Command: "KICK",
1564 Params: params,
1565 })
1566 }
1567 case "MODE":
1568 var name string
1569 if err := parseMessageParams(msg, &name); err != nil {
1570 return err
1571 }
1572
1573 var modeStr string
1574 if len(msg.Params) > 1 {
1575 modeStr = msg.Params[1]
1576 }
1577
1578 if casemapASCII(name) == dc.nickCM {
1579 if modeStr != "" {
1580 dc.forEachUpstream(func(uc *upstreamConn) {
1581 uc.SendMessageLabeled(dc.id, &irc.Message{
1582 Command: "MODE",
1583 Params: []string{uc.nick, modeStr},
1584 })
1585 })
1586 } else {
1587 // TODO: only do this in multi-upstream mode
1588 dc.SendMessage(&irc.Message{
1589 Prefix: dc.srv.prefix(),
1590 Command: irc.RPL_UMODEIS,
1591 Params: []string{dc.nick, ""}, // TODO
1592 })
1593 }
1594 return nil
1595 }
1596
1597 uc, upstreamName, err := dc.unmarshalEntity(name)
1598 if err != nil {
1599 return err
1600 }
1601
1602 if !uc.isChannel(upstreamName) {
1603 return ircError{&irc.Message{
1604 Command: irc.ERR_USERSDONTMATCH,
1605 Params: []string{dc.nick, "Cannot change mode for other users"},
1606 }}
1607 }
1608
1609 if modeStr != "" {
1610 params := []string{upstreamName, modeStr}
1611 params = append(params, msg.Params[2:]...)
1612 uc.SendMessageLabeled(dc.id, &irc.Message{
1613 Command: "MODE",
1614 Params: params,
1615 })
1616 } else {
1617 ch := uc.channels.Value(upstreamName)
1618 if ch == nil {
1619 return ircError{&irc.Message{
1620 Command: irc.ERR_NOSUCHCHANNEL,
1621 Params: []string{dc.nick, name, "No such channel"},
1622 }}
1623 }
1624
1625 if ch.modes == nil {
1626 // we haven't received the initial RPL_CHANNELMODEIS yet
1627 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1628 return nil
1629 }
1630
1631 modeStr, modeParams := ch.modes.Format()
1632 params := []string{dc.nick, name, modeStr}
1633 params = append(params, modeParams...)
1634
1635 dc.SendMessage(&irc.Message{
1636 Prefix: dc.srv.prefix(),
1637 Command: irc.RPL_CHANNELMODEIS,
1638 Params: params,
1639 })
1640 if ch.creationTime != "" {
1641 dc.SendMessage(&irc.Message{
1642 Prefix: dc.srv.prefix(),
1643 Command: rpl_creationtime,
1644 Params: []string{dc.nick, name, ch.creationTime},
1645 })
1646 }
1647 }
1648 case "TOPIC":
1649 var channel string
1650 if err := parseMessageParams(msg, &channel); err != nil {
1651 return err
1652 }
1653
1654 uc, upstreamName, err := dc.unmarshalEntity(channel)
1655 if err != nil {
1656 return err
1657 }
1658
1659 if len(msg.Params) > 1 { // setting topic
1660 topic := msg.Params[1]
1661 uc.SendMessageLabeled(dc.id, &irc.Message{
1662 Command: "TOPIC",
1663 Params: []string{upstreamName, topic},
1664 })
1665 } else { // getting topic
1666 ch := uc.channels.Value(upstreamName)
1667 if ch == nil {
1668 return ircError{&irc.Message{
1669 Command: irc.ERR_NOSUCHCHANNEL,
1670 Params: []string{dc.nick, upstreamName, "No such channel"},
1671 }}
1672 }
1673 sendTopic(dc, ch)
1674 }
1675 case "LIST":
1676 // TODO: support ELIST when supported by all upstreams
1677
1678 pl := pendingLIST{
1679 downstreamID: dc.id,
1680 pendingCommands: make(map[int64]*irc.Message),
1681 }
1682 var upstream *upstreamConn
1683 var upstreamChannels map[int64][]string
1684 if len(msg.Params) > 0 {
1685 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1686 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1687 upstream = uc
1688 } else {
1689 upstreamChannels = make(map[int64][]string)
1690 channels := strings.Split(msg.Params[0], ",")
1691 for _, channel := range channels {
1692 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1693 if err != nil {
1694 return err
1695 }
1696 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1697 }
1698 }
1699 }
1700
1701 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1702 dc.forEachUpstream(func(uc *upstreamConn) {
1703 if upstream != nil && upstream != uc {
1704 return
1705 }
1706 var params []string
1707 if upstreamChannels != nil {
1708 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1709 params = []string{strings.Join(channels, ",")}
1710 } else {
1711 return
1712 }
1713 }
1714 pl.pendingCommands[uc.network.ID] = &irc.Message{
1715 Command: "LIST",
1716 Params: params,
1717 }
1718 uc.trySendLIST(dc.id)
1719 })
1720 case "NAMES":
1721 if len(msg.Params) == 0 {
1722 dc.SendMessage(&irc.Message{
1723 Prefix: dc.srv.prefix(),
1724 Command: irc.RPL_ENDOFNAMES,
1725 Params: []string{dc.nick, "*", "End of /NAMES list"},
1726 })
1727 return nil
1728 }
1729
1730 channels := strings.Split(msg.Params[0], ",")
1731 for _, channel := range channels {
1732 uc, upstreamName, err := dc.unmarshalEntity(channel)
1733 if err != nil {
1734 return err
1735 }
1736
1737 ch := uc.channels.Value(upstreamName)
1738 if ch != nil {
1739 sendNames(dc, ch)
1740 } else {
1741 // NAMES on a channel we have not joined, ask upstream
1742 uc.SendMessageLabeled(dc.id, &irc.Message{
1743 Command: "NAMES",
1744 Params: []string{upstreamName},
1745 })
1746 }
1747 }
1748 case "WHO":
1749 if len(msg.Params) == 0 {
1750 // TODO: support WHO without parameters
1751 dc.SendMessage(&irc.Message{
1752 Prefix: dc.srv.prefix(),
1753 Command: irc.RPL_ENDOFWHO,
1754 Params: []string{dc.nick, "*", "End of /WHO list"},
1755 })
1756 return nil
1757 }
1758
1759 // TODO: support WHO masks
1760 entity := msg.Params[0]
1761 entityCM := casemapASCII(entity)
1762
1763 if dc.network == nil && entityCM == dc.nickCM {
1764 // TODO: support AWAY (H/G) in self WHO reply
1765 dc.SendMessage(&irc.Message{
1766 Prefix: dc.srv.prefix(),
1767 Command: irc.RPL_WHOREPLY,
1768 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1769 })
1770 dc.SendMessage(&irc.Message{
1771 Prefix: dc.srv.prefix(),
1772 Command: irc.RPL_ENDOFWHO,
1773 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1774 })
1775 return nil
1776 }
1777 if entityCM == serviceNickCM {
1778 dc.SendMessage(&irc.Message{
1779 Prefix: dc.srv.prefix(),
1780 Command: irc.RPL_WHOREPLY,
1781 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1782 })
1783 dc.SendMessage(&irc.Message{
1784 Prefix: dc.srv.prefix(),
1785 Command: irc.RPL_ENDOFWHO,
1786 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1787 })
1788 return nil
1789 }
1790
1791 uc, upstreamName, err := dc.unmarshalEntity(entity)
1792 if err != nil {
1793 return err
1794 }
1795
1796 var params []string
1797 if len(msg.Params) == 2 {
1798 params = []string{upstreamName, msg.Params[1]}
1799 } else {
1800 params = []string{upstreamName}
1801 }
1802
1803 uc.SendMessageLabeled(dc.id, &irc.Message{
1804 Command: "WHO",
1805 Params: params,
1806 })
1807 case "WHOIS":
1808 if len(msg.Params) == 0 {
1809 return ircError{&irc.Message{
1810 Command: irc.ERR_NONICKNAMEGIVEN,
1811 Params: []string{dc.nick, "No nickname given"},
1812 }}
1813 }
1814
1815 var target, mask string
1816 if len(msg.Params) == 1 {
1817 target = ""
1818 mask = msg.Params[0]
1819 } else {
1820 target = msg.Params[0]
1821 mask = msg.Params[1]
1822 }
1823 // TODO: support multiple WHOIS users
1824 if i := strings.IndexByte(mask, ','); i >= 0 {
1825 mask = mask[:i]
1826 }
1827
1828 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1829 dc.SendMessage(&irc.Message{
1830 Prefix: dc.srv.prefix(),
1831 Command: irc.RPL_WHOISUSER,
1832 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1833 })
1834 dc.SendMessage(&irc.Message{
1835 Prefix: dc.srv.prefix(),
1836 Command: irc.RPL_WHOISSERVER,
1837 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1838 })
1839 dc.SendMessage(&irc.Message{
1840 Prefix: dc.srv.prefix(),
1841 Command: irc.RPL_ENDOFWHOIS,
1842 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1843 })
1844 return nil
1845 }
1846
1847 // TODO: support WHOIS masks
1848 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1849 if err != nil {
1850 return err
1851 }
1852
1853 var params []string
1854 if target != "" {
1855 if target == mask { // WHOIS nick nick
1856 params = []string{upstreamNick, upstreamNick}
1857 } else {
1858 params = []string{target, upstreamNick}
1859 }
1860 } else {
1861 params = []string{upstreamNick}
1862 }
1863
1864 uc.SendMessageLabeled(dc.id, &irc.Message{
1865 Command: "WHOIS",
1866 Params: params,
1867 })
1868 case "PRIVMSG":
1869 var targetsStr, text string
1870 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1871 return err
1872 }
1873 tags := copyClientTags(msg.Tags)
1874
1875 for _, name := range strings.Split(targetsStr, ",") {
1876 if dc.network == nil && casemapASCII(name) == dc.nickCM {
1877 dc.SendMessage(msg)
1878 continue
1879 }
1880
1881 if casemapASCII(name) == serviceNickCM {
1882 if dc.caps["echo-message"] {
1883 echoTags := tags.Copy()
1884 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1885 dc.SendMessage(&irc.Message{
1886 Tags: echoTags,
1887 Prefix: dc.prefix(),
1888 Command: "PRIVMSG",
1889 Params: []string{name, text},
1890 })
1891 }
1892 handleServicePRIVMSG(dc, text)
1893 continue
1894 }
1895
1896 uc, upstreamName, err := dc.unmarshalEntity(name)
1897 if err != nil {
1898 return err
1899 }
1900
1901 if uc.network.casemap(upstreamName) == "nickserv" {
1902 dc.handleNickServPRIVMSG(uc, text)
1903 }
1904
1905 unmarshaledText := text
1906 if uc.isChannel(upstreamName) {
1907 unmarshaledText = dc.unmarshalText(uc, text)
1908 }
1909 uc.SendMessageLabeled(dc.id, &irc.Message{
1910 Tags: tags,
1911 Command: "PRIVMSG",
1912 Params: []string{upstreamName, unmarshaledText},
1913 })
1914
1915 echoTags := tags.Copy()
1916 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1917 echoMsg := &irc.Message{
1918 Tags: echoTags,
1919 Prefix: &irc.Prefix{
1920 Name: uc.nick,
1921 User: uc.username,
1922 },
1923 Command: "PRIVMSG",
1924 Params: []string{upstreamName, text},
1925 }
1926 uc.produce(upstreamName, echoMsg, dc)
1927
1928 uc.updateChannelAutoDetach(upstreamName)
1929 }
1930 case "NOTICE":
1931 var targetsStr, text string
1932 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1933 return err
1934 }
1935 tags := copyClientTags(msg.Tags)
1936
1937 for _, name := range strings.Split(targetsStr, ",") {
1938 uc, upstreamName, err := dc.unmarshalEntity(name)
1939 if err != nil {
1940 return err
1941 }
1942
1943 unmarshaledText := text
1944 if uc.isChannel(upstreamName) {
1945 unmarshaledText = dc.unmarshalText(uc, text)
1946 }
1947 uc.SendMessageLabeled(dc.id, &irc.Message{
1948 Tags: tags,
1949 Command: "NOTICE",
1950 Params: []string{upstreamName, unmarshaledText},
1951 })
1952
1953 uc.updateChannelAutoDetach(upstreamName)
1954 }
1955 case "TAGMSG":
1956 var targetsStr string
1957 if err := parseMessageParams(msg, &targetsStr); err != nil {
1958 return err
1959 }
1960 tags := copyClientTags(msg.Tags)
1961
1962 for _, name := range strings.Split(targetsStr, ",") {
1963 uc, upstreamName, err := dc.unmarshalEntity(name)
1964 if err != nil {
1965 return err
1966 }
1967 if _, ok := uc.caps["message-tags"]; !ok {
1968 continue
1969 }
1970
1971 uc.SendMessageLabeled(dc.id, &irc.Message{
1972 Tags: tags,
1973 Command: "TAGMSG",
1974 Params: []string{upstreamName},
1975 })
1976
1977 uc.updateChannelAutoDetach(upstreamName)
1978 }
1979 case "INVITE":
1980 var user, channel string
1981 if err := parseMessageParams(msg, &user, &channel); err != nil {
1982 return err
1983 }
1984
1985 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1986 if err != nil {
1987 return err
1988 }
1989
1990 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1991 if err != nil {
1992 return err
1993 }
1994
1995 if ucChannel != ucUser {
1996 return ircError{&irc.Message{
1997 Command: irc.ERR_USERNOTINCHANNEL,
1998 Params: []string{dc.nick, user, channel, "They are on another network"},
1999 }}
2000 }
2001 uc := ucChannel
2002
2003 uc.SendMessageLabeled(dc.id, &irc.Message{
2004 Command: "INVITE",
2005 Params: []string{upstreamUser, upstreamChannel},
2006 })
2007 case "CHATHISTORY":
2008 var subcommand string
2009 if err := parseMessageParams(msg, &subcommand); err != nil {
2010 return err
2011 }
2012 var target, limitStr string
2013 var boundsStr [2]string
2014 switch subcommand {
2015 case "AFTER", "BEFORE":
2016 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2017 return err
2018 }
2019 case "BETWEEN":
2020 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2021 return err
2022 }
2023 default:
2024 // TODO: support LATEST, AROUND
2025 return ircError{&irc.Message{
2026 Command: "FAIL",
2027 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2028 }}
2029 }
2030
2031 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2032 if !ok {
2033 return ircError{&irc.Message{
2034 Command: irc.ERR_UNKNOWNCOMMAND,
2035 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2036 }}
2037 }
2038
2039 uc, entity, err := dc.unmarshalEntity(target)
2040 if err != nil {
2041 return err
2042 }
2043 entity = uc.network.casemap(entity)
2044
2045 // TODO: support msgid criteria
2046 var bounds [2]time.Time
2047 bounds[0] = parseChatHistoryBound(boundsStr[0])
2048 if bounds[0].IsZero() {
2049 return ircError{&irc.Message{
2050 Command: "FAIL",
2051 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2052 }}
2053 }
2054
2055 if boundsStr[1] != "" {
2056 bounds[1] = parseChatHistoryBound(boundsStr[1])
2057 if bounds[1].IsZero() {
2058 return ircError{&irc.Message{
2059 Command: "FAIL",
2060 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2061 }}
2062 }
2063 }
2064
2065 limit, err := strconv.Atoi(limitStr)
2066 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
2067 return ircError{&irc.Message{
2068 Command: "FAIL",
2069 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2070 }}
2071 }
2072
2073 var history []*irc.Message
2074 switch subcommand {
2075 case "BEFORE":
2076 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], time.Time{}, limit)
2077 case "AFTER":
2078 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], time.Now(), limit)
2079 case "BETWEEN":
2080 if bounds[0].Before(bounds[1]) {
2081 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], bounds[1], limit)
2082 } else {
2083 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], bounds[1], limit)
2084 }
2085 }
2086 if err != nil {
2087 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2088 return newChatHistoryError(subcommand, target)
2089 }
2090
2091 batchRef := "history"
2092 dc.SendMessage(&irc.Message{
2093 Prefix: dc.srv.prefix(),
2094 Command: "BATCH",
2095 Params: []string{"+" + batchRef, "chathistory", target},
2096 })
2097
2098 for _, msg := range history {
2099 msg.Tags["batch"] = irc.TagValue(batchRef)
2100 dc.SendMessage(dc.marshalMessage(msg, uc.network))
2101 }
2102
2103 dc.SendMessage(&irc.Message{
2104 Prefix: dc.srv.prefix(),
2105 Command: "BATCH",
2106 Params: []string{"-" + batchRef},
2107 })
2108 case "BOUNCER":
2109 var subcommand string
2110 if err := parseMessageParams(msg, &subcommand); err != nil {
2111 return err
2112 }
2113
2114 switch strings.ToUpper(subcommand) {
2115 case "LISTNETWORKS":
2116 dc.SendMessage(&irc.Message{
2117 Prefix: dc.srv.prefix(),
2118 Command: "BATCH",
2119 Params: []string{"+networks", "soju.im/bouncer-networks"},
2120 })
2121 dc.user.forEachNetwork(func(network *network) {
2122 idStr := fmt.Sprintf("%v", network.ID)
2123 attrs := getNetworkAttrs(network)
2124 dc.SendMessage(&irc.Message{
2125 Tags: irc.Tags{"batch": irc.TagValue("networks")},
2126 Prefix: dc.srv.prefix(),
2127 Command: "BOUNCER",
2128 Params: []string{"NETWORK", idStr, attrs.String()},
2129 })
2130 })
2131 dc.SendMessage(&irc.Message{
2132 Prefix: dc.srv.prefix(),
2133 Command: "BATCH",
2134 Params: []string{"-networks"},
2135 })
2136 case "ADDNETWORK":
2137 var attrsStr string
2138 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2139 return err
2140 }
2141 attrs := irc.ParseTags(attrsStr)
2142
2143 host, ok := attrs.GetTag("host")
2144 if !ok {
2145 return ircError{&irc.Message{
2146 Command: "FAIL",
2147 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
2148 }}
2149 }
2150
2151 addr := host
2152 if port, ok := attrs.GetTag("port"); ok {
2153 addr += ":" + port
2154 }
2155
2156 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
2157 addr = "irc+insecure://" + tlsStr
2158 }
2159
2160 nick, ok := attrs.GetTag("nickname")
2161 if !ok {
2162 nick = dc.nick
2163 }
2164
2165 username, _ := attrs.GetTag("username")
2166 realname, _ := attrs.GetTag("realname")
2167 pass, _ := attrs.GetTag("pass")
2168
2169 // TODO: reject unknown attributes
2170
2171 record := &Network{
2172 Addr: addr,
2173 Nick: nick,
2174 Username: username,
2175 Realname: realname,
2176 Pass: pass,
2177 }
2178 network, err := dc.user.createNetwork(record)
2179 if err != nil {
2180 return ircError{&irc.Message{
2181 Command: "FAIL",
2182 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2183 }}
2184 }
2185
2186 dc.SendMessage(&irc.Message{
2187 Prefix: dc.srv.prefix(),
2188 Command: "BOUNCER",
2189 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2190 })
2191 case "CHANGENETWORK":
2192 var idStr, attrsStr string
2193 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2194 return err
2195 }
2196 id, err := parseBouncerNetID(subcommand, idStr)
2197 if err != nil {
2198 return err
2199 }
2200 attrs := irc.ParseTags(attrsStr)
2201
2202 net := dc.user.getNetworkByID(id)
2203 if net == nil {
2204 return ircError{&irc.Message{
2205 Command: "FAIL",
2206 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2207 }}
2208 }
2209
2210 record := net.Network // copy network record because we'll mutate it
2211 for k, v := range attrs {
2212 s := string(v)
2213 switch k {
2214 // TODO: host, port, tls
2215 case "nickname":
2216 record.Nick = s
2217 case "username":
2218 record.Username = s
2219 case "realname":
2220 record.Realname = s
2221 case "pass":
2222 record.Pass = s
2223 default:
2224 return ircError{&irc.Message{
2225 Command: "FAIL",
2226 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
2227 }}
2228 }
2229 }
2230
2231 _, err = dc.user.updateNetwork(&record)
2232 if err != nil {
2233 return ircError{&irc.Message{
2234 Command: "FAIL",
2235 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2236 }}
2237 }
2238
2239 dc.SendMessage(&irc.Message{
2240 Prefix: dc.srv.prefix(),
2241 Command: "BOUNCER",
2242 Params: []string{"CHANGENETWORK", idStr},
2243 })
2244 case "DELNETWORK":
2245 var idStr string
2246 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2247 return err
2248 }
2249 id, err := parseBouncerNetID(subcommand, idStr)
2250 if err != nil {
2251 return err
2252 }
2253
2254 net := dc.user.getNetworkByID(id)
2255 if net == nil {
2256 return ircError{&irc.Message{
2257 Command: "FAIL",
2258 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2259 }}
2260 }
2261
2262 if err := dc.user.deleteNetwork(net.ID); err != nil {
2263 return err
2264 }
2265
2266 dc.SendMessage(&irc.Message{
2267 Prefix: dc.srv.prefix(),
2268 Command: "BOUNCER",
2269 Params: []string{"DELNETWORK", idStr},
2270 })
2271 default:
2272 return ircError{&irc.Message{
2273 Command: "FAIL",
2274 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2275 }}
2276 }
2277 default:
2278 dc.logger.Printf("unhandled message: %v", msg)
2279 return newUnknownCommandError(msg.Command)
2280 }
2281 return nil
2282}
2283
2284func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2285 username, password, ok := parseNickServCredentials(text, uc.nick)
2286 if !ok {
2287 return
2288 }
2289
2290 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2291 // automatically erase the key pair or any other credentials.
2292 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2293 return
2294 }
2295
2296 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2297 n := uc.network
2298 n.SASL.Mechanism = "PLAIN"
2299 n.SASL.Plain.Username = username
2300 n.SASL.Plain.Password = password
2301 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
2302 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2303 }
2304}
2305
2306func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2307 fields := strings.Fields(text)
2308 if len(fields) < 2 {
2309 return "", "", false
2310 }
2311 cmd := strings.ToUpper(fields[0])
2312 params := fields[1:]
2313 switch cmd {
2314 case "REGISTER":
2315 username = nick
2316 password = params[0]
2317 case "IDENTIFY":
2318 if len(params) == 1 {
2319 username = nick
2320 password = params[0]
2321 } else {
2322 username = params[0]
2323 password = params[1]
2324 }
2325 case "SET":
2326 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2327 username = nick
2328 password = params[1]
2329 }
2330 default:
2331 return "", "", false
2332 }
2333 return username, password, true
2334}
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