source: code/trunk/downstream.go@ 550

Last change on this file since 550 was 550, checked in by contact, 4 years ago

Prune detached channels from CHATHISTORY TARGETS
File size: 59.3 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 Enabled: true,
1007 })
1008 if err != nil {
1009 return err
1010 }
1011 }
1012
1013 dc.network = network
1014 return nil
1015}
1016
1017func (dc *downstreamConn) welcome() error {
1018 if dc.user == nil || !dc.registered {
1019 panic("tried to welcome an unregistered connection")
1020 }
1021
1022 // TODO: doing this might take some time. We should do it in dc.register
1023 // instead, but we'll potentially be adding a new network and this must be
1024 // done in the user goroutine.
1025 if err := dc.loadNetwork(); err != nil {
1026 return err
1027 }
1028
1029 isupport := []string{
1030 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
1031 "CASEMAPPING=ascii",
1032 }
1033
1034 if dc.network != nil {
1035 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1036 }
1037
1038 if uc := dc.upstream(); uc != nil {
1039 for k := range passthroughIsupport {
1040 v, ok := uc.isupport[k]
1041 if !ok {
1042 continue
1043 }
1044 if v != nil {
1045 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1046 } else {
1047 isupport = append(isupport, k)
1048 }
1049 }
1050 }
1051
1052 dc.SendMessage(&irc.Message{
1053 Prefix: dc.srv.prefix(),
1054 Command: irc.RPL_WELCOME,
1055 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1056 })
1057 dc.SendMessage(&irc.Message{
1058 Prefix: dc.srv.prefix(),
1059 Command: irc.RPL_YOURHOST,
1060 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1061 })
1062 dc.SendMessage(&irc.Message{
1063 Prefix: dc.srv.prefix(),
1064 Command: irc.RPL_CREATED,
1065 Params: []string{dc.nick, "Who cares when the server was created?"},
1066 })
1067 dc.SendMessage(&irc.Message{
1068 Prefix: dc.srv.prefix(),
1069 Command: irc.RPL_MYINFO,
1070 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1071 })
1072 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1073 dc.SendMessage(msg)
1074 }
1075 dc.SendMessage(&irc.Message{
1076 Prefix: dc.srv.prefix(),
1077 Command: irc.ERR_NOMOTD,
1078 Params: []string{dc.nick, "No MOTD"},
1079 })
1080
1081 dc.updateNick()
1082 dc.updateRealname()
1083 dc.updateSupportedCaps()
1084
1085 if dc.caps["soju.im/bouncer-networks-notify"] {
1086 dc.SendMessage(&irc.Message{
1087 Prefix: dc.srv.prefix(),
1088 Command: "BATCH",
1089 Params: []string{"+networks", "soju.im/bouncer-networks"},
1090 })
1091 dc.user.forEachNetwork(func(network *network) {
1092 idStr := fmt.Sprintf("%v", network.ID)
1093 attrs := getNetworkAttrs(network)
1094 dc.SendMessage(&irc.Message{
1095 Tags: irc.Tags{"batch": irc.TagValue("networks")},
1096 Prefix: dc.srv.prefix(),
1097 Command: "BOUNCER",
1098 Params: []string{"NETWORK", idStr, attrs.String()},
1099 })
1100 })
1101 dc.SendMessage(&irc.Message{
1102 Prefix: dc.srv.prefix(),
1103 Command: "BATCH",
1104 Params: []string{"-networks"},
1105 })
1106 }
1107
1108 dc.forEachUpstream(func(uc *upstreamConn) {
1109 for _, entry := range uc.channels.innerMap {
1110 ch := entry.value.(*upstreamChannel)
1111 if !ch.complete {
1112 continue
1113 }
1114 record := uc.network.channels.Value(ch.Name)
1115 if record != nil && record.Detached {
1116 continue
1117 }
1118
1119 dc.SendMessage(&irc.Message{
1120 Prefix: dc.prefix(),
1121 Command: "JOIN",
1122 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1123 })
1124
1125 forwardChannel(dc, ch)
1126 }
1127 })
1128
1129 dc.forEachNetwork(func(net *network) {
1130 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1131 return
1132 }
1133
1134 // Only send history if we're the first connected client with that name
1135 // for the network
1136 firstClient := true
1137 dc.user.forEachDownstream(func(c *downstreamConn) {
1138 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1139 firstClient = false
1140 }
1141 })
1142 if firstClient {
1143 net.delivered.ForEachTarget(func(target string) {
1144 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1145 if lastDelivered == "" {
1146 return
1147 }
1148
1149 dc.sendTargetBacklog(net, target, lastDelivered)
1150
1151 // Fast-forward history to last message
1152 targetCM := net.casemap(target)
1153 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1154 if err != nil {
1155 dc.logger.Printf("failed to get last message ID: %v", err)
1156 return
1157 }
1158 net.delivered.StoreID(target, dc.clientName, lastID)
1159 })
1160 }
1161 })
1162
1163 return nil
1164}
1165
1166// messageSupportsHistory checks whether the provided message can be sent as
1167// part of an history batch.
1168func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1169 // Don't replay all messages, because that would mess up client
1170 // state. For instance we just sent the list of users, sending
1171 // PART messages for one of these users would be incorrect.
1172 // TODO: add support for draft/event-playback
1173 switch msg.Command {
1174 case "PRIVMSG", "NOTICE":
1175 return true
1176 }
1177 return false
1178}
1179
1180func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1181 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1182 return
1183 }
1184
1185 ch := net.channels.Value(target)
1186
1187 limit := 4000
1188 targetCM := net.casemap(target)
1189 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1190 if err != nil {
1191 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1192 return
1193 }
1194
1195 batchRef := "history"
1196 if dc.caps["batch"] {
1197 dc.SendMessage(&irc.Message{
1198 Prefix: dc.srv.prefix(),
1199 Command: "BATCH",
1200 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1201 })
1202 }
1203
1204 for _, msg := range history {
1205 if !dc.messageSupportsHistory(msg) {
1206 continue
1207 }
1208
1209 if ch != nil && ch.Detached {
1210 if net.detachedMessageNeedsRelay(ch, msg) {
1211 dc.relayDetachedMessage(net, msg)
1212 }
1213 } else {
1214 if dc.caps["batch"] {
1215 msg.Tags["batch"] = irc.TagValue(batchRef)
1216 }
1217 dc.SendMessage(dc.marshalMessage(msg, net))
1218 }
1219 }
1220
1221 if dc.caps["batch"] {
1222 dc.SendMessage(&irc.Message{
1223 Prefix: dc.srv.prefix(),
1224 Command: "BATCH",
1225 Params: []string{"-" + batchRef},
1226 })
1227 }
1228}
1229
1230func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1231 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1232 return
1233 }
1234
1235 sender := msg.Prefix.Name
1236 target, text := msg.Params[0], msg.Params[1]
1237 if net.isHighlight(msg) {
1238 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1239 } else {
1240 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1241 }
1242}
1243
1244func (dc *downstreamConn) runUntilRegistered() error {
1245 for !dc.registered {
1246 msg, err := dc.ReadMessage()
1247 if err != nil {
1248 return fmt.Errorf("failed to read IRC command: %v", err)
1249 }
1250
1251 err = dc.handleMessage(msg)
1252 if ircErr, ok := err.(ircError); ok {
1253 ircErr.Message.Prefix = dc.srv.prefix()
1254 dc.SendMessage(ircErr.Message)
1255 } else if err != nil {
1256 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1257 }
1258 }
1259
1260 return nil
1261}
1262
1263func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1264 switch msg.Command {
1265 case "CAP":
1266 var subCmd string
1267 if err := parseMessageParams(msg, &subCmd); err != nil {
1268 return err
1269 }
1270 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1271 return err
1272 }
1273 case "PING":
1274 var source, destination string
1275 if err := parseMessageParams(msg, &source); err != nil {
1276 return err
1277 }
1278 if len(msg.Params) > 1 {
1279 destination = msg.Params[1]
1280 }
1281 if destination != "" && destination != dc.srv.Hostname {
1282 return ircError{&irc.Message{
1283 Command: irc.ERR_NOSUCHSERVER,
1284 Params: []string{dc.nick, destination, "No such server"},
1285 }}
1286 }
1287 dc.SendMessage(&irc.Message{
1288 Prefix: dc.srv.prefix(),
1289 Command: "PONG",
1290 Params: []string{dc.srv.Hostname, source},
1291 })
1292 return nil
1293 case "PONG":
1294 if len(msg.Params) == 0 {
1295 return newNeedMoreParamsError(msg.Command)
1296 }
1297 token := msg.Params[len(msg.Params)-1]
1298 dc.handlePong(token)
1299 case "USER":
1300 return ircError{&irc.Message{
1301 Command: irc.ERR_ALREADYREGISTERED,
1302 Params: []string{dc.nick, "You may not reregister"},
1303 }}
1304 case "NICK":
1305 var rawNick string
1306 if err := parseMessageParams(msg, &rawNick); err != nil {
1307 return err
1308 }
1309
1310 nick := rawNick
1311 var upstream *upstreamConn
1312 if dc.upstream() == nil {
1313 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1314 if err == nil { // NICK nick/network: NICK only on a specific upstream
1315 upstream = uc
1316 nick = unmarshaledNick
1317 }
1318 }
1319
1320 if strings.ContainsAny(nick, illegalNickChars) {
1321 return ircError{&irc.Message{
1322 Command: irc.ERR_ERRONEUSNICKNAME,
1323 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1324 }}
1325 }
1326 if casemapASCII(nick) == serviceNickCM {
1327 return ircError{&irc.Message{
1328 Command: irc.ERR_NICKNAMEINUSE,
1329 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1330 }}
1331 }
1332
1333 var err error
1334 dc.forEachNetwork(func(n *network) {
1335 if err != nil || (upstream != nil && upstream.network != n) {
1336 return
1337 }
1338 n.Nick = nick
1339 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1340 })
1341 if err != nil {
1342 return err
1343 }
1344
1345 dc.forEachUpstream(func(uc *upstreamConn) {
1346 if upstream != nil && upstream != uc {
1347 return
1348 }
1349 uc.SendMessageLabeled(dc.id, &irc.Message{
1350 Command: "NICK",
1351 Params: []string{nick},
1352 })
1353 })
1354
1355 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1356 dc.SendMessage(&irc.Message{
1357 Prefix: dc.prefix(),
1358 Command: "NICK",
1359 Params: []string{nick},
1360 })
1361 dc.nick = nick
1362 dc.nickCM = casemapASCII(dc.nick)
1363 }
1364 case "SETNAME":
1365 var realname string
1366 if err := parseMessageParams(msg, &realname); err != nil {
1367 return err
1368 }
1369
1370 var storeErr error
1371 var needUpdate []Network
1372 dc.forEachNetwork(func(n *network) {
1373 // We only need to call updateNetwork for upstreams that don't
1374 // support setname
1375 if uc := n.conn; uc != nil && uc.caps["setname"] {
1376 uc.SendMessageLabeled(dc.id, &irc.Message{
1377 Command: "SETNAME",
1378 Params: []string{realname},
1379 })
1380
1381 n.Realname = realname
1382 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1383 dc.logger.Printf("failed to store network realname: %v", err)
1384 storeErr = err
1385 }
1386 return
1387 }
1388
1389 record := n.Network // copy network record because we'll mutate it
1390 record.Realname = realname
1391 needUpdate = append(needUpdate, record)
1392 })
1393
1394 // Walk the network list as a second step, because updateNetwork
1395 // mutates the original list
1396 for _, record := range needUpdate {
1397 if _, err := dc.user.updateNetwork(&record); err != nil {
1398 dc.logger.Printf("failed to update network realname: %v", err)
1399 storeErr = err
1400 }
1401 }
1402 if storeErr != nil {
1403 return ircError{&irc.Message{
1404 Command: "FAIL",
1405 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1406 }}
1407 }
1408
1409 if dc.upstream() == nil && dc.caps["setname"] {
1410 dc.SendMessage(&irc.Message{
1411 Prefix: dc.prefix(),
1412 Command: "SETNAME",
1413 Params: []string{realname},
1414 })
1415 }
1416 case "JOIN":
1417 var namesStr string
1418 if err := parseMessageParams(msg, &namesStr); err != nil {
1419 return err
1420 }
1421
1422 var keys []string
1423 if len(msg.Params) > 1 {
1424 keys = strings.Split(msg.Params[1], ",")
1425 }
1426
1427 for i, name := range strings.Split(namesStr, ",") {
1428 uc, upstreamName, err := dc.unmarshalEntity(name)
1429 if err != nil {
1430 return err
1431 }
1432
1433 var key string
1434 if len(keys) > i {
1435 key = keys[i]
1436 }
1437
1438 if !uc.isChannel(upstreamName) {
1439 dc.SendMessage(&irc.Message{
1440 Prefix: dc.srv.prefix(),
1441 Command: irc.ERR_NOSUCHCHANNEL,
1442 Params: []string{name, "Not a channel name"},
1443 })
1444 continue
1445 }
1446
1447 params := []string{upstreamName}
1448 if key != "" {
1449 params = append(params, key)
1450 }
1451 uc.SendMessageLabeled(dc.id, &irc.Message{
1452 Command: "JOIN",
1453 Params: params,
1454 })
1455
1456 ch := uc.network.channels.Value(upstreamName)
1457 if ch != nil {
1458 // Don't clear the channel key if there's one set
1459 // TODO: add a way to unset the channel key
1460 if key != "" {
1461 ch.Key = key
1462 }
1463 uc.network.attach(ch)
1464 } else {
1465 ch = &Channel{
1466 Name: upstreamName,
1467 Key: key,
1468 }
1469 uc.network.channels.SetValue(upstreamName, ch)
1470 }
1471 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1472 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1473 }
1474 }
1475 case "PART":
1476 var namesStr string
1477 if err := parseMessageParams(msg, &namesStr); err != nil {
1478 return err
1479 }
1480
1481 var reason string
1482 if len(msg.Params) > 1 {
1483 reason = msg.Params[1]
1484 }
1485
1486 for _, name := range strings.Split(namesStr, ",") {
1487 uc, upstreamName, err := dc.unmarshalEntity(name)
1488 if err != nil {
1489 return err
1490 }
1491
1492 if strings.EqualFold(reason, "detach") {
1493 ch := uc.network.channels.Value(upstreamName)
1494 if ch != nil {
1495 uc.network.detach(ch)
1496 } else {
1497 ch = &Channel{
1498 Name: name,
1499 Detached: true,
1500 }
1501 uc.network.channels.SetValue(upstreamName, ch)
1502 }
1503 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1504 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1505 }
1506 } else {
1507 params := []string{upstreamName}
1508 if reason != "" {
1509 params = append(params, reason)
1510 }
1511 uc.SendMessageLabeled(dc.id, &irc.Message{
1512 Command: "PART",
1513 Params: params,
1514 })
1515
1516 if err := uc.network.deleteChannel(upstreamName); err != nil {
1517 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1518 }
1519 }
1520 }
1521 case "KICK":
1522 var channelStr, userStr string
1523 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1524 return err
1525 }
1526
1527 channels := strings.Split(channelStr, ",")
1528 users := strings.Split(userStr, ",")
1529
1530 var reason string
1531 if len(msg.Params) > 2 {
1532 reason = msg.Params[2]
1533 }
1534
1535 if len(channels) != 1 && len(channels) != len(users) {
1536 return ircError{&irc.Message{
1537 Command: irc.ERR_BADCHANMASK,
1538 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1539 }}
1540 }
1541
1542 for i, user := range users {
1543 var channel string
1544 if len(channels) == 1 {
1545 channel = channels[0]
1546 } else {
1547 channel = channels[i]
1548 }
1549
1550 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1551 if err != nil {
1552 return err
1553 }
1554
1555 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1556 if err != nil {
1557 return err
1558 }
1559
1560 if ucChannel != ucUser {
1561 return ircError{&irc.Message{
1562 Command: irc.ERR_USERNOTINCHANNEL,
1563 Params: []string{dc.nick, user, channel, "They are on another network"},
1564 }}
1565 }
1566 uc := ucChannel
1567
1568 params := []string{upstreamChannel, upstreamUser}
1569 if reason != "" {
1570 params = append(params, reason)
1571 }
1572 uc.SendMessageLabeled(dc.id, &irc.Message{
1573 Command: "KICK",
1574 Params: params,
1575 })
1576 }
1577 case "MODE":
1578 var name string
1579 if err := parseMessageParams(msg, &name); err != nil {
1580 return err
1581 }
1582
1583 var modeStr string
1584 if len(msg.Params) > 1 {
1585 modeStr = msg.Params[1]
1586 }
1587
1588 if casemapASCII(name) == dc.nickCM {
1589 if modeStr != "" {
1590 dc.forEachUpstream(func(uc *upstreamConn) {
1591 uc.SendMessageLabeled(dc.id, &irc.Message{
1592 Command: "MODE",
1593 Params: []string{uc.nick, modeStr},
1594 })
1595 })
1596 } else {
1597 // TODO: only do this in multi-upstream mode
1598 dc.SendMessage(&irc.Message{
1599 Prefix: dc.srv.prefix(),
1600 Command: irc.RPL_UMODEIS,
1601 Params: []string{dc.nick, ""}, // TODO
1602 })
1603 }
1604 return nil
1605 }
1606
1607 uc, upstreamName, err := dc.unmarshalEntity(name)
1608 if err != nil {
1609 return err
1610 }
1611
1612 if !uc.isChannel(upstreamName) {
1613 return ircError{&irc.Message{
1614 Command: irc.ERR_USERSDONTMATCH,
1615 Params: []string{dc.nick, "Cannot change mode for other users"},
1616 }}
1617 }
1618
1619 if modeStr != "" {
1620 params := []string{upstreamName, modeStr}
1621 params = append(params, msg.Params[2:]...)
1622 uc.SendMessageLabeled(dc.id, &irc.Message{
1623 Command: "MODE",
1624 Params: params,
1625 })
1626 } else {
1627 ch := uc.channels.Value(upstreamName)
1628 if ch == nil {
1629 return ircError{&irc.Message{
1630 Command: irc.ERR_NOSUCHCHANNEL,
1631 Params: []string{dc.nick, name, "No such channel"},
1632 }}
1633 }
1634
1635 if ch.modes == nil {
1636 // we haven't received the initial RPL_CHANNELMODEIS yet
1637 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1638 return nil
1639 }
1640
1641 modeStr, modeParams := ch.modes.Format()
1642 params := []string{dc.nick, name, modeStr}
1643 params = append(params, modeParams...)
1644
1645 dc.SendMessage(&irc.Message{
1646 Prefix: dc.srv.prefix(),
1647 Command: irc.RPL_CHANNELMODEIS,
1648 Params: params,
1649 })
1650 if ch.creationTime != "" {
1651 dc.SendMessage(&irc.Message{
1652 Prefix: dc.srv.prefix(),
1653 Command: rpl_creationtime,
1654 Params: []string{dc.nick, name, ch.creationTime},
1655 })
1656 }
1657 }
1658 case "TOPIC":
1659 var channel string
1660 if err := parseMessageParams(msg, &channel); err != nil {
1661 return err
1662 }
1663
1664 uc, upstreamName, err := dc.unmarshalEntity(channel)
1665 if err != nil {
1666 return err
1667 }
1668
1669 if len(msg.Params) > 1 { // setting topic
1670 topic := msg.Params[1]
1671 uc.SendMessageLabeled(dc.id, &irc.Message{
1672 Command: "TOPIC",
1673 Params: []string{upstreamName, topic},
1674 })
1675 } else { // getting topic
1676 ch := uc.channels.Value(upstreamName)
1677 if ch == nil {
1678 return ircError{&irc.Message{
1679 Command: irc.ERR_NOSUCHCHANNEL,
1680 Params: []string{dc.nick, upstreamName, "No such channel"},
1681 }}
1682 }
1683 sendTopic(dc, ch)
1684 }
1685 case "LIST":
1686 // TODO: support ELIST when supported by all upstreams
1687
1688 pl := pendingLIST{
1689 downstreamID: dc.id,
1690 pendingCommands: make(map[int64]*irc.Message),
1691 }
1692 var upstream *upstreamConn
1693 var upstreamChannels map[int64][]string
1694 if len(msg.Params) > 0 {
1695 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1696 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1697 upstream = uc
1698 } else {
1699 upstreamChannels = make(map[int64][]string)
1700 channels := strings.Split(msg.Params[0], ",")
1701 for _, channel := range channels {
1702 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1703 if err != nil {
1704 return err
1705 }
1706 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1707 }
1708 }
1709 }
1710
1711 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1712 dc.forEachUpstream(func(uc *upstreamConn) {
1713 if upstream != nil && upstream != uc {
1714 return
1715 }
1716 var params []string
1717 if upstreamChannels != nil {
1718 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1719 params = []string{strings.Join(channels, ",")}
1720 } else {
1721 return
1722 }
1723 }
1724 pl.pendingCommands[uc.network.ID] = &irc.Message{
1725 Command: "LIST",
1726 Params: params,
1727 }
1728 uc.trySendLIST(dc.id)
1729 })
1730 case "NAMES":
1731 if len(msg.Params) == 0 {
1732 dc.SendMessage(&irc.Message{
1733 Prefix: dc.srv.prefix(),
1734 Command: irc.RPL_ENDOFNAMES,
1735 Params: []string{dc.nick, "*", "End of /NAMES list"},
1736 })
1737 return nil
1738 }
1739
1740 channels := strings.Split(msg.Params[0], ",")
1741 for _, channel := range channels {
1742 uc, upstreamName, err := dc.unmarshalEntity(channel)
1743 if err != nil {
1744 return err
1745 }
1746
1747 ch := uc.channels.Value(upstreamName)
1748 if ch != nil {
1749 sendNames(dc, ch)
1750 } else {
1751 // NAMES on a channel we have not joined, ask upstream
1752 uc.SendMessageLabeled(dc.id, &irc.Message{
1753 Command: "NAMES",
1754 Params: []string{upstreamName},
1755 })
1756 }
1757 }
1758 case "WHO":
1759 if len(msg.Params) == 0 {
1760 // TODO: support WHO without parameters
1761 dc.SendMessage(&irc.Message{
1762 Prefix: dc.srv.prefix(),
1763 Command: irc.RPL_ENDOFWHO,
1764 Params: []string{dc.nick, "*", "End of /WHO list"},
1765 })
1766 return nil
1767 }
1768
1769 // TODO: support WHO masks
1770 entity := msg.Params[0]
1771 entityCM := casemapASCII(entity)
1772
1773 if dc.network == nil && entityCM == dc.nickCM {
1774 // TODO: support AWAY (H/G) in self WHO reply
1775 dc.SendMessage(&irc.Message{
1776 Prefix: dc.srv.prefix(),
1777 Command: irc.RPL_WHOREPLY,
1778 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1779 })
1780 dc.SendMessage(&irc.Message{
1781 Prefix: dc.srv.prefix(),
1782 Command: irc.RPL_ENDOFWHO,
1783 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1784 })
1785 return nil
1786 }
1787 if entityCM == serviceNickCM {
1788 dc.SendMessage(&irc.Message{
1789 Prefix: dc.srv.prefix(),
1790 Command: irc.RPL_WHOREPLY,
1791 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1792 })
1793 dc.SendMessage(&irc.Message{
1794 Prefix: dc.srv.prefix(),
1795 Command: irc.RPL_ENDOFWHO,
1796 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1797 })
1798 return nil
1799 }
1800
1801 uc, upstreamName, err := dc.unmarshalEntity(entity)
1802 if err != nil {
1803 return err
1804 }
1805
1806 var params []string
1807 if len(msg.Params) == 2 {
1808 params = []string{upstreamName, msg.Params[1]}
1809 } else {
1810 params = []string{upstreamName}
1811 }
1812
1813 uc.SendMessageLabeled(dc.id, &irc.Message{
1814 Command: "WHO",
1815 Params: params,
1816 })
1817 case "WHOIS":
1818 if len(msg.Params) == 0 {
1819 return ircError{&irc.Message{
1820 Command: irc.ERR_NONICKNAMEGIVEN,
1821 Params: []string{dc.nick, "No nickname given"},
1822 }}
1823 }
1824
1825 var target, mask string
1826 if len(msg.Params) == 1 {
1827 target = ""
1828 mask = msg.Params[0]
1829 } else {
1830 target = msg.Params[0]
1831 mask = msg.Params[1]
1832 }
1833 // TODO: support multiple WHOIS users
1834 if i := strings.IndexByte(mask, ','); i >= 0 {
1835 mask = mask[:i]
1836 }
1837
1838 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1839 dc.SendMessage(&irc.Message{
1840 Prefix: dc.srv.prefix(),
1841 Command: irc.RPL_WHOISUSER,
1842 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1843 })
1844 dc.SendMessage(&irc.Message{
1845 Prefix: dc.srv.prefix(),
1846 Command: irc.RPL_WHOISSERVER,
1847 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1848 })
1849 dc.SendMessage(&irc.Message{
1850 Prefix: dc.srv.prefix(),
1851 Command: irc.RPL_ENDOFWHOIS,
1852 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1853 })
1854 return nil
1855 }
1856
1857 // TODO: support WHOIS masks
1858 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1859 if err != nil {
1860 return err
1861 }
1862
1863 var params []string
1864 if target != "" {
1865 if target == mask { // WHOIS nick nick
1866 params = []string{upstreamNick, upstreamNick}
1867 } else {
1868 params = []string{target, upstreamNick}
1869 }
1870 } else {
1871 params = []string{upstreamNick}
1872 }
1873
1874 uc.SendMessageLabeled(dc.id, &irc.Message{
1875 Command: "WHOIS",
1876 Params: params,
1877 })
1878 case "PRIVMSG":
1879 var targetsStr, text string
1880 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1881 return err
1882 }
1883 tags := copyClientTags(msg.Tags)
1884
1885 for _, name := range strings.Split(targetsStr, ",") {
1886 if dc.network == nil && casemapASCII(name) == dc.nickCM {
1887 dc.SendMessage(msg)
1888 continue
1889 }
1890
1891 if casemapASCII(name) == serviceNickCM {
1892 if dc.caps["echo-message"] {
1893 echoTags := tags.Copy()
1894 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1895 dc.SendMessage(&irc.Message{
1896 Tags: echoTags,
1897 Prefix: dc.prefix(),
1898 Command: "PRIVMSG",
1899 Params: []string{name, text},
1900 })
1901 }
1902 handleServicePRIVMSG(dc, text)
1903 continue
1904 }
1905
1906 uc, upstreamName, err := dc.unmarshalEntity(name)
1907 if err != nil {
1908 return err
1909 }
1910
1911 if uc.network.casemap(upstreamName) == "nickserv" {
1912 dc.handleNickServPRIVMSG(uc, text)
1913 }
1914
1915 unmarshaledText := text
1916 if uc.isChannel(upstreamName) {
1917 unmarshaledText = dc.unmarshalText(uc, text)
1918 }
1919 uc.SendMessageLabeled(dc.id, &irc.Message{
1920 Tags: tags,
1921 Command: "PRIVMSG",
1922 Params: []string{upstreamName, unmarshaledText},
1923 })
1924
1925 echoTags := tags.Copy()
1926 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1927 echoMsg := &irc.Message{
1928 Tags: echoTags,
1929 Prefix: &irc.Prefix{
1930 Name: uc.nick,
1931 User: uc.username,
1932 },
1933 Command: "PRIVMSG",
1934 Params: []string{upstreamName, text},
1935 }
1936 uc.produce(upstreamName, echoMsg, dc)
1937
1938 uc.updateChannelAutoDetach(upstreamName)
1939 }
1940 case "NOTICE":
1941 var targetsStr, text string
1942 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1943 return err
1944 }
1945 tags := copyClientTags(msg.Tags)
1946
1947 for _, name := range strings.Split(targetsStr, ",") {
1948 uc, upstreamName, err := dc.unmarshalEntity(name)
1949 if err != nil {
1950 return err
1951 }
1952
1953 unmarshaledText := text
1954 if uc.isChannel(upstreamName) {
1955 unmarshaledText = dc.unmarshalText(uc, text)
1956 }
1957 uc.SendMessageLabeled(dc.id, &irc.Message{
1958 Tags: tags,
1959 Command: "NOTICE",
1960 Params: []string{upstreamName, unmarshaledText},
1961 })
1962
1963 uc.updateChannelAutoDetach(upstreamName)
1964 }
1965 case "TAGMSG":
1966 var targetsStr string
1967 if err := parseMessageParams(msg, &targetsStr); err != nil {
1968 return err
1969 }
1970 tags := copyClientTags(msg.Tags)
1971
1972 for _, name := range strings.Split(targetsStr, ",") {
1973 uc, upstreamName, err := dc.unmarshalEntity(name)
1974 if err != nil {
1975 return err
1976 }
1977 if _, ok := uc.caps["message-tags"]; !ok {
1978 continue
1979 }
1980
1981 uc.SendMessageLabeled(dc.id, &irc.Message{
1982 Tags: tags,
1983 Command: "TAGMSG",
1984 Params: []string{upstreamName},
1985 })
1986
1987 uc.updateChannelAutoDetach(upstreamName)
1988 }
1989 case "INVITE":
1990 var user, channel string
1991 if err := parseMessageParams(msg, &user, &channel); err != nil {
1992 return err
1993 }
1994
1995 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1996 if err != nil {
1997 return err
1998 }
1999
2000 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2001 if err != nil {
2002 return err
2003 }
2004
2005 if ucChannel != ucUser {
2006 return ircError{&irc.Message{
2007 Command: irc.ERR_USERNOTINCHANNEL,
2008 Params: []string{dc.nick, user, channel, "They are on another network"},
2009 }}
2010 }
2011 uc := ucChannel
2012
2013 uc.SendMessageLabeled(dc.id, &irc.Message{
2014 Command: "INVITE",
2015 Params: []string{upstreamUser, upstreamChannel},
2016 })
2017 case "CHATHISTORY":
2018 var subcommand string
2019 if err := parseMessageParams(msg, &subcommand); err != nil {
2020 return err
2021 }
2022 var target, limitStr string
2023 var boundsStr [2]string
2024 switch subcommand {
2025 case "AFTER", "BEFORE":
2026 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2027 return err
2028 }
2029 case "BETWEEN":
2030 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2031 return err
2032 }
2033 case "TARGETS":
2034 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2035 return err
2036 }
2037 default:
2038 // TODO: support LATEST, AROUND
2039 return ircError{&irc.Message{
2040 Command: "FAIL",
2041 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2042 }}
2043 }
2044
2045 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2046 if !ok {
2047 return ircError{&irc.Message{
2048 Command: irc.ERR_UNKNOWNCOMMAND,
2049 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2050 }}
2051 }
2052
2053 uc, entity, err := dc.unmarshalEntity(target)
2054 if err != nil {
2055 return err
2056 }
2057 entity = uc.network.casemap(entity)
2058
2059 // TODO: support msgid criteria
2060 var bounds [2]time.Time
2061 bounds[0] = parseChatHistoryBound(boundsStr[0])
2062 if bounds[0].IsZero() {
2063 return ircError{&irc.Message{
2064 Command: "FAIL",
2065 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2066 }}
2067 }
2068
2069 if boundsStr[1] != "" {
2070 bounds[1] = parseChatHistoryBound(boundsStr[1])
2071 if bounds[1].IsZero() {
2072 return ircError{&irc.Message{
2073 Command: "FAIL",
2074 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2075 }}
2076 }
2077 }
2078
2079 limit, err := strconv.Atoi(limitStr)
2080 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
2081 return ircError{&irc.Message{
2082 Command: "FAIL",
2083 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2084 }}
2085 }
2086
2087 var history []*irc.Message
2088 switch subcommand {
2089 case "BEFORE":
2090 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], time.Time{}, limit)
2091 case "AFTER":
2092 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], time.Now(), limit)
2093 case "BETWEEN":
2094 if bounds[0].Before(bounds[1]) {
2095 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], bounds[1], limit)
2096 } else {
2097 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], bounds[1], limit)
2098 }
2099 case "TARGETS":
2100 // TODO: support TARGETS in multi-upstream mode
2101 targets, err := store.ListTargets(uc.network, bounds[0], bounds[1], limit)
2102 if err != nil {
2103 dc.logger.Printf("failed fetching targets for chathistory: %v", target, err)
2104 return ircError{&irc.Message{
2105 Command: "FAIL",
2106 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2107 }}
2108 }
2109
2110 batchRef := "history-targets"
2111 dc.SendMessage(&irc.Message{
2112 Prefix: dc.srv.prefix(),
2113 Command: "BATCH",
2114 Params: []string{"+" + batchRef, "draft/chathistory-targets"},
2115 })
2116
2117 for _, target := range targets {
2118 if ch := uc.network.channels.Value(target.Name); ch != nil && ch.Detached {
2119 continue
2120 }
2121
2122 dc.SendMessage(&irc.Message{
2123 Tags: irc.Tags{"batch": irc.TagValue(batchRef)},
2124 Prefix: dc.srv.prefix(),
2125 Command: "CHATHISTORY",
2126 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2127 })
2128 }
2129
2130 dc.SendMessage(&irc.Message{
2131 Prefix: dc.srv.prefix(),
2132 Command: "BATCH",
2133 Params: []string{"-" + batchRef},
2134 })
2135
2136 return nil
2137 }
2138 if err != nil {
2139 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2140 return newChatHistoryError(subcommand, target)
2141 }
2142
2143 batchRef := "history"
2144 dc.SendMessage(&irc.Message{
2145 Prefix: dc.srv.prefix(),
2146 Command: "BATCH",
2147 Params: []string{"+" + batchRef, "chathistory", target},
2148 })
2149
2150 for _, msg := range history {
2151 msg.Tags["batch"] = irc.TagValue(batchRef)
2152 dc.SendMessage(dc.marshalMessage(msg, uc.network))
2153 }
2154
2155 dc.SendMessage(&irc.Message{
2156 Prefix: dc.srv.prefix(),
2157 Command: "BATCH",
2158 Params: []string{"-" + batchRef},
2159 })
2160 case "BOUNCER":
2161 var subcommand string
2162 if err := parseMessageParams(msg, &subcommand); err != nil {
2163 return err
2164 }
2165
2166 switch strings.ToUpper(subcommand) {
2167 case "LISTNETWORKS":
2168 dc.SendMessage(&irc.Message{
2169 Prefix: dc.srv.prefix(),
2170 Command: "BATCH",
2171 Params: []string{"+networks", "soju.im/bouncer-networks"},
2172 })
2173 dc.user.forEachNetwork(func(network *network) {
2174 idStr := fmt.Sprintf("%v", network.ID)
2175 attrs := getNetworkAttrs(network)
2176 dc.SendMessage(&irc.Message{
2177 Tags: irc.Tags{"batch": irc.TagValue("networks")},
2178 Prefix: dc.srv.prefix(),
2179 Command: "BOUNCER",
2180 Params: []string{"NETWORK", idStr, attrs.String()},
2181 })
2182 })
2183 dc.SendMessage(&irc.Message{
2184 Prefix: dc.srv.prefix(),
2185 Command: "BATCH",
2186 Params: []string{"-networks"},
2187 })
2188 case "ADDNETWORK":
2189 var attrsStr string
2190 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2191 return err
2192 }
2193 attrs := irc.ParseTags(attrsStr)
2194
2195 host, ok := attrs.GetTag("host")
2196 if !ok {
2197 return ircError{&irc.Message{
2198 Command: "FAIL",
2199 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
2200 }}
2201 }
2202
2203 addr := host
2204 if port, ok := attrs.GetTag("port"); ok {
2205 addr += ":" + port
2206 }
2207
2208 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
2209 addr = "irc+insecure://" + tlsStr
2210 }
2211
2212 nick, ok := attrs.GetTag("nickname")
2213 if !ok {
2214 nick = dc.nick
2215 }
2216
2217 username, _ := attrs.GetTag("username")
2218 realname, _ := attrs.GetTag("realname")
2219 pass, _ := attrs.GetTag("pass")
2220
2221 // TODO: reject unknown attributes
2222
2223 record := &Network{
2224 Addr: addr,
2225 Nick: nick,
2226 Username: username,
2227 Realname: realname,
2228 Pass: pass,
2229 Enabled: true,
2230 }
2231 network, err := dc.user.createNetwork(record)
2232 if err != nil {
2233 return ircError{&irc.Message{
2234 Command: "FAIL",
2235 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2236 }}
2237 }
2238
2239 dc.SendMessage(&irc.Message{
2240 Prefix: dc.srv.prefix(),
2241 Command: "BOUNCER",
2242 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2243 })
2244 case "CHANGENETWORK":
2245 var idStr, attrsStr string
2246 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2247 return err
2248 }
2249 id, err := parseBouncerNetID(subcommand, idStr)
2250 if err != nil {
2251 return err
2252 }
2253 attrs := irc.ParseTags(attrsStr)
2254
2255 net := dc.user.getNetworkByID(id)
2256 if net == nil {
2257 return ircError{&irc.Message{
2258 Command: "FAIL",
2259 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2260 }}
2261 }
2262
2263 record := net.Network // copy network record because we'll mutate it
2264 for k, v := range attrs {
2265 s := string(v)
2266 switch k {
2267 // TODO: host, port, tls
2268 case "nickname":
2269 record.Nick = s
2270 case "username":
2271 record.Username = s
2272 case "realname":
2273 record.Realname = s
2274 case "pass":
2275 record.Pass = s
2276 default:
2277 return ircError{&irc.Message{
2278 Command: "FAIL",
2279 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
2280 }}
2281 }
2282 }
2283
2284 _, err = dc.user.updateNetwork(&record)
2285 if err != nil {
2286 return ircError{&irc.Message{
2287 Command: "FAIL",
2288 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2289 }}
2290 }
2291
2292 dc.SendMessage(&irc.Message{
2293 Prefix: dc.srv.prefix(),
2294 Command: "BOUNCER",
2295 Params: []string{"CHANGENETWORK", idStr},
2296 })
2297 case "DELNETWORK":
2298 var idStr string
2299 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2300 return err
2301 }
2302 id, err := parseBouncerNetID(subcommand, idStr)
2303 if err != nil {
2304 return err
2305 }
2306
2307 net := dc.user.getNetworkByID(id)
2308 if net == nil {
2309 return ircError{&irc.Message{
2310 Command: "FAIL",
2311 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2312 }}
2313 }
2314
2315 if err := dc.user.deleteNetwork(net.ID); err != nil {
2316 return err
2317 }
2318
2319 dc.SendMessage(&irc.Message{
2320 Prefix: dc.srv.prefix(),
2321 Command: "BOUNCER",
2322 Params: []string{"DELNETWORK", idStr},
2323 })
2324 default:
2325 return ircError{&irc.Message{
2326 Command: "FAIL",
2327 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2328 }}
2329 }
2330 default:
2331 dc.logger.Printf("unhandled message: %v", msg)
2332
2333 // Only forward unknown commands in single-upstream mode
2334 uc := dc.upstream()
2335 if uc == nil {
2336 return newUnknownCommandError(msg.Command)
2337 }
2338
2339 uc.SendMessageLabeled(dc.id, msg)
2340 }
2341 return nil
2342}
2343
2344func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2345 username, password, ok := parseNickServCredentials(text, uc.nick)
2346 if !ok {
2347 return
2348 }
2349
2350 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2351 // automatically erase the key pair or any other credentials.
2352 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2353 return
2354 }
2355
2356 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2357 n := uc.network
2358 n.SASL.Mechanism = "PLAIN"
2359 n.SASL.Plain.Username = username
2360 n.SASL.Plain.Password = password
2361 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
2362 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2363 }
2364}
2365
2366func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2367 fields := strings.Fields(text)
2368 if len(fields) < 2 {
2369 return "", "", false
2370 }
2371 cmd := strings.ToUpper(fields[0])
2372 params := fields[1:]
2373 switch cmd {
2374 case "REGISTER":
2375 username = nick
2376 password = params[0]
2377 case "IDENTIFY":
2378 if len(params) == 1 {
2379 username = nick
2380 password = params[0]
2381 } else {
2382 username = params[0]
2383 password = params[1]
2384 }
2385 case "SET":
2386 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2387 username = nick
2388 password = params[1]
2389 }
2390 default:
2391 return "", "", false
2392 }
2393 return username, password, true
2394}
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