source: code/trunk/downstream.go@ 585

Last change on this file since 585 was 585, checked in by contact, 4 years ago

Don't require upstream to be connected for CHATHISTORY

Closes: ​https://todo.sr.ht/~emersion/soju/127
File size: 60.7 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 realname := GetRealname(&network.user.User, &network.Network); realname != "" {
87 attrs["realname"] = irc.TagValue(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, '$' breaks server masks in PRIVMSG/NOTICE
113const illegalNickChars = " :@!*?$"
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 "account-tag": "",
135 "away-notify": "",
136 "extended-join": "",
137 "multi-prefix": "",
138}
139
140// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
141// through from the upstream server to downstream clients.
142//
143// This is only effective in single-upstream mode.
144var passthroughIsupport = map[string]bool{
145 "AWAYLEN": true,
146 "BOT": true,
147 "CHANLIMIT": true,
148 "CHANMODES": true,
149 "CHANNELLEN": true,
150 "CHANTYPES": true,
151 "CLIENTTAGDENY": true,
152 "EXCEPTS": true,
153 "EXTBAN": true,
154 "HOSTLEN": true,
155 "INVEX": true,
156 "KICKLEN": true,
157 "MAXLIST": true,
158 "MAXTARGETS": true,
159 "MODES": true,
160 "NAMELEN": true,
161 "NETWORK": true,
162 "NICKLEN": true,
163 "PREFIX": true,
164 "SAFELIST": true,
165 "TARGMAX": true,
166 "TOPICLEN": true,
167 "USERLEN": true,
168 "UTF8ONLY": true,
169}
170
171type downstreamConn struct {
172 conn
173
174 id uint64
175
176 registered bool
177 user *user
178 nick string
179 nickCM string
180 rawUsername string
181 networkName string
182 clientName string
183 realname string
184 hostname string
185 password string // empty after authentication
186 network *network // can be nil
187
188 negociatingCaps bool
189 capVersion int
190 supportedCaps map[string]string
191 caps map[string]bool
192
193 lastBatchRef uint64
194
195 saslServer sasl.Server
196}
197
198func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
199 remoteAddr := ic.RemoteAddr().String()
200 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
201 options := connOptions{Logger: logger}
202 dc := &downstreamConn{
203 conn: *newConn(srv, ic, &options),
204 id: id,
205 supportedCaps: make(map[string]string),
206 caps: make(map[string]bool),
207 }
208 dc.hostname = remoteAddr
209 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
210 dc.hostname = host
211 }
212 for k, v := range permanentDownstreamCaps {
213 dc.supportedCaps[k] = v
214 }
215 if srv.LogPath != "" {
216 dc.supportedCaps["draft/chathistory"] = ""
217 }
218 return dc
219}
220
221func (dc *downstreamConn) prefix() *irc.Prefix {
222 return &irc.Prefix{
223 Name: dc.nick,
224 User: dc.user.Username,
225 Host: dc.hostname,
226 }
227}
228
229func (dc *downstreamConn) forEachNetwork(f func(*network)) {
230 if dc.network != nil {
231 f(dc.network)
232 } else if !dc.caps["soju.im/bouncer-networks"] {
233 dc.user.forEachNetwork(f)
234 }
235}
236
237func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
238 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
239 return
240 }
241 dc.user.forEachUpstream(func(uc *upstreamConn) {
242 if dc.network != nil && uc.network != dc.network {
243 return
244 }
245 f(uc)
246 })
247}
248
249// upstream returns the upstream connection, if any. If there are zero or if
250// there are multiple upstream connections, it returns nil.
251func (dc *downstreamConn) upstream() *upstreamConn {
252 if dc.network == nil {
253 return nil
254 }
255 return dc.network.conn
256}
257
258func isOurNick(net *network, nick string) bool {
259 // TODO: this doesn't account for nick changes
260 if net.conn != nil {
261 return net.casemap(nick) == net.conn.nickCM
262 }
263 // We're not currently connected to the upstream connection, so we don't
264 // know whether this name is our nickname. Best-effort: use the network's
265 // configured nickname and hope it was the one being used when we were
266 // connected.
267 return net.casemap(nick) == net.casemap(net.Nick)
268}
269
270// marshalEntity converts an upstream entity name (ie. channel or nick) into a
271// downstream entity name.
272//
273// This involves adding a "/<network>" suffix if the entity isn't the current
274// user.
275func (dc *downstreamConn) marshalEntity(net *network, name string) string {
276 if isOurNick(net, name) {
277 return dc.nick
278 }
279 name = partialCasemap(net.casemap, name)
280 if dc.network != nil {
281 if dc.network != net {
282 panic("soju: tried to marshal an entity for another network")
283 }
284 return name
285 }
286 return name + "/" + net.GetName()
287}
288
289func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
290 if isOurNick(net, prefix.Name) {
291 return dc.prefix()
292 }
293 prefix.Name = partialCasemap(net.casemap, prefix.Name)
294 if dc.network != nil {
295 if dc.network != net {
296 panic("soju: tried to marshal a user prefix for another network")
297 }
298 return prefix
299 }
300 return &irc.Prefix{
301 Name: prefix.Name + "/" + net.GetName(),
302 User: prefix.User,
303 Host: prefix.Host,
304 }
305}
306
307// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
308// nick) into an upstream entity name.
309//
310// This involves removing the "/<network>" suffix.
311func (dc *downstreamConn) unmarshalEntityNetwork(name string) (*network, string, error) {
312 if dc.network != nil {
313 return dc.network, name, nil
314 }
315
316 var net *network
317 if i := strings.LastIndexByte(name, '/'); i >= 0 {
318 network := name[i+1:]
319 name = name[:i]
320
321 for _, n := range dc.user.networks {
322 if network == n.GetName() {
323 net = n
324 break
325 }
326 }
327 }
328
329 if net == nil {
330 return nil, "", ircError{&irc.Message{
331 Command: irc.ERR_NOSUCHCHANNEL,
332 Params: []string{name, "Missing network suffix in name"},
333 }}
334 }
335
336 return net, name, nil
337}
338
339// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
340// upstream connection and fails if the upstream is disconnected.
341func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
342 net, name, err := dc.unmarshalEntityNetwork(name)
343 if err != nil {
344 return nil, "", err
345 }
346
347 if net.conn == nil {
348 return nil, "", ircError{&irc.Message{
349 Command: irc.ERR_NOSUCHCHANNEL,
350 Params: []string{name, "Disconnected from upstream network"},
351 }}
352 }
353
354 return net.conn, name, nil
355}
356
357func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
358 if dc.upstream() != nil {
359 return text
360 }
361 // TODO: smarter parsing that ignores URLs
362 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
363}
364
365func (dc *downstreamConn) readMessages(ch chan<- event) error {
366 for {
367 msg, err := dc.ReadMessage()
368 if err == io.EOF {
369 break
370 } else if err != nil {
371 return fmt.Errorf("failed to read IRC command: %v", err)
372 }
373
374 ch <- eventDownstreamMessage{msg, dc}
375 }
376
377 return nil
378}
379
380// SendMessage sends an outgoing message.
381//
382// This can only called from the user goroutine.
383func (dc *downstreamConn) SendMessage(msg *irc.Message) {
384 if !dc.caps["message-tags"] {
385 if msg.Command == "TAGMSG" {
386 return
387 }
388 msg = msg.Copy()
389 for name := range msg.Tags {
390 supported := false
391 switch name {
392 case "time":
393 supported = dc.caps["server-time"]
394 case "account":
395 supported = dc.caps["account"]
396 }
397 if !supported {
398 delete(msg.Tags, name)
399 }
400 }
401 }
402 if !dc.caps["batch"] && msg.Tags["batch"] != "" {
403 msg = msg.Copy()
404 delete(msg.Tags, "batch")
405 }
406 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
407 msg.Params = msg.Params[:1]
408 }
409 if msg.Command == "SETNAME" && !dc.caps["setname"] {
410 return
411 }
412
413 dc.conn.SendMessage(msg)
414}
415
416func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
417 dc.lastBatchRef++
418 ref := fmt.Sprintf("%v", dc.lastBatchRef)
419
420 if dc.caps["batch"] {
421 dc.SendMessage(&irc.Message{
422 Tags: tags,
423 Prefix: dc.srv.prefix(),
424 Command: "BATCH",
425 Params: append([]string{"+" + ref, typ}, params...),
426 })
427 }
428
429 f(irc.TagValue(ref))
430
431 if dc.caps["batch"] {
432 dc.SendMessage(&irc.Message{
433 Prefix: dc.srv.prefix(),
434 Command: "BATCH",
435 Params: []string{"-" + ref},
436 })
437 }
438}
439
440// sendMessageWithID sends an outgoing message with the specified internal ID.
441func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
442 dc.SendMessage(msg)
443
444 if id == "" || !dc.messageSupportsHistory(msg) {
445 return
446 }
447
448 dc.sendPing(id)
449}
450
451// advanceMessageWithID advances history to the specified message ID without
452// sending a message. This is useful e.g. for self-messages when echo-message
453// isn't enabled.
454func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
455 if id == "" || !dc.messageSupportsHistory(msg) {
456 return
457 }
458
459 dc.sendPing(id)
460}
461
462// ackMsgID acknowledges that a message has been received.
463func (dc *downstreamConn) ackMsgID(id string) {
464 netID, entity, err := parseMsgID(id, nil)
465 if err != nil {
466 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
467 return
468 }
469
470 network := dc.user.getNetworkByID(netID)
471 if network == nil {
472 return
473 }
474
475 network.delivered.StoreID(entity, dc.clientName, id)
476}
477
478func (dc *downstreamConn) sendPing(msgID string) {
479 token := "soju-msgid-" + msgID
480 dc.SendMessage(&irc.Message{
481 Command: "PING",
482 Params: []string{token},
483 })
484}
485
486func (dc *downstreamConn) handlePong(token string) {
487 if !strings.HasPrefix(token, "soju-msgid-") {
488 dc.logger.Printf("received unrecognized PONG token %q", token)
489 return
490 }
491 msgID := strings.TrimPrefix(token, "soju-msgid-")
492 dc.ackMsgID(msgID)
493}
494
495// marshalMessage re-formats a message coming from an upstream connection so
496// that it's suitable for being sent on this downstream connection. Only
497// messages that may appear in logs are supported, except MODE.
498func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
499 msg = msg.Copy()
500 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
501
502 switch msg.Command {
503 case "PRIVMSG", "NOTICE", "TAGMSG":
504 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
505 case "NICK":
506 // Nick change for another user
507 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
508 case "JOIN", "PART":
509 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
510 case "KICK":
511 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
512 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
513 case "TOPIC":
514 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
515 case "QUIT", "SETNAME":
516 // This space is intentionally left blank
517 default:
518 panic(fmt.Sprintf("unexpected %q message", msg.Command))
519 }
520
521 return msg
522}
523
524func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
525 switch msg.Command {
526 case "QUIT":
527 return dc.Close()
528 default:
529 if dc.registered {
530 return dc.handleMessageRegistered(msg)
531 } else {
532 return dc.handleMessageUnregistered(msg)
533 }
534 }
535}
536
537func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
538 switch msg.Command {
539 case "NICK":
540 var nick string
541 if err := parseMessageParams(msg, &nick); err != nil {
542 return err
543 }
544 if strings.ContainsAny(nick, illegalNickChars) {
545 return ircError{&irc.Message{
546 Command: irc.ERR_ERRONEUSNICKNAME,
547 Params: []string{dc.nick, nick, "contains illegal characters"},
548 }}
549 }
550 nickCM := casemapASCII(nick)
551 if nickCM == serviceNickCM {
552 return ircError{&irc.Message{
553 Command: irc.ERR_NICKNAMEINUSE,
554 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
555 }}
556 }
557 dc.nick = nick
558 dc.nickCM = nickCM
559 case "USER":
560 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
561 return err
562 }
563 case "PASS":
564 if err := parseMessageParams(msg, &dc.password); err != nil {
565 return err
566 }
567 case "CAP":
568 var subCmd string
569 if err := parseMessageParams(msg, &subCmd); err != nil {
570 return err
571 }
572 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
573 return err
574 }
575 case "AUTHENTICATE":
576 if !dc.caps["sasl"] {
577 return ircError{&irc.Message{
578 Command: irc.ERR_SASLFAIL,
579 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
580 }}
581 }
582 if len(msg.Params) == 0 {
583 return ircError{&irc.Message{
584 Command: irc.ERR_SASLFAIL,
585 Params: []string{"*", "Missing AUTHENTICATE argument"},
586 }}
587 }
588 if dc.nick == "" {
589 return ircError{&irc.Message{
590 Command: irc.ERR_SASLFAIL,
591 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
592 }}
593 }
594
595 var resp []byte
596 if dc.saslServer == nil {
597 mech := strings.ToUpper(msg.Params[0])
598 switch mech {
599 case "PLAIN":
600 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
601 return dc.authenticate(username, password)
602 }))
603 default:
604 return ircError{&irc.Message{
605 Command: irc.ERR_SASLFAIL,
606 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
607 }}
608 }
609 } else if msg.Params[0] == "*" {
610 dc.saslServer = nil
611 return ircError{&irc.Message{
612 Command: irc.ERR_SASLABORTED,
613 Params: []string{"*", "SASL authentication aborted"},
614 }}
615 } else if msg.Params[0] == "+" {
616 resp = nil
617 } else {
618 // TODO: multi-line messages
619 var err error
620 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
621 if err != nil {
622 dc.saslServer = nil
623 return ircError{&irc.Message{
624 Command: irc.ERR_SASLFAIL,
625 Params: []string{"*", "Invalid base64-encoded response"},
626 }}
627 }
628 }
629
630 challenge, done, err := dc.saslServer.Next(resp)
631 if err != nil {
632 dc.saslServer = nil
633 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
634 return ircError{&irc.Message{
635 Command: irc.ERR_SASLFAIL,
636 Params: []string{"*", ircErr.Message.Params[1]},
637 }}
638 }
639 dc.SendMessage(&irc.Message{
640 Prefix: dc.srv.prefix(),
641 Command: irc.ERR_SASLFAIL,
642 Params: []string{"*", "SASL error"},
643 })
644 return fmt.Errorf("SASL authentication failed: %v", err)
645 } else if done {
646 dc.saslServer = nil
647 dc.SendMessage(&irc.Message{
648 Prefix: dc.srv.prefix(),
649 Command: irc.RPL_LOGGEDIN,
650 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
651 })
652 dc.SendMessage(&irc.Message{
653 Prefix: dc.srv.prefix(),
654 Command: irc.RPL_SASLSUCCESS,
655 Params: []string{dc.nick, "SASL authentication successful"},
656 })
657 } else {
658 challengeStr := "+"
659 if len(challenge) > 0 {
660 challengeStr = base64.StdEncoding.EncodeToString(challenge)
661 }
662
663 // TODO: multi-line messages
664 dc.SendMessage(&irc.Message{
665 Prefix: dc.srv.prefix(),
666 Command: "AUTHENTICATE",
667 Params: []string{challengeStr},
668 })
669 }
670 case "BOUNCER":
671 var subcommand string
672 if err := parseMessageParams(msg, &subcommand); err != nil {
673 return err
674 }
675
676 switch strings.ToUpper(subcommand) {
677 case "BIND":
678 var idStr string
679 if err := parseMessageParams(msg, nil, &idStr); err != nil {
680 return err
681 }
682
683 if dc.registered {
684 return ircError{&irc.Message{
685 Command: "FAIL",
686 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind bouncer network after registration"},
687 }}
688 }
689 if dc.user == nil {
690 return ircError{&irc.Message{
691 Command: "FAIL",
692 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
693 }}
694 }
695
696 id, err := parseBouncerNetID(subcommand, idStr)
697 if err != nil {
698 return err
699 }
700
701 var match *network
702 dc.user.forEachNetwork(func(net *network) {
703 if net.ID == id {
704 match = net
705 }
706 })
707 if match == nil {
708 return ircError{&irc.Message{
709 Command: "FAIL",
710 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
711 }}
712 }
713
714 dc.networkName = match.GetName()
715 }
716 default:
717 dc.logger.Printf("unhandled message: %v", msg)
718 return newUnknownCommandError(msg.Command)
719 }
720 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
721 return dc.register()
722 }
723 return nil
724}
725
726func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
727 cmd = strings.ToUpper(cmd)
728
729 replyTo := dc.nick
730 if !dc.registered {
731 replyTo = "*"
732 }
733
734 switch cmd {
735 case "LS":
736 if len(args) > 0 {
737 var err error
738 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
739 return err
740 }
741 }
742 if !dc.registered && dc.capVersion >= 302 {
743 // Let downstream show everything it supports, and trim
744 // down the available capabilities when upstreams are
745 // known.
746 for k, v := range needAllDownstreamCaps {
747 dc.supportedCaps[k] = v
748 }
749 }
750
751 caps := make([]string, 0, len(dc.supportedCaps))
752 for k, v := range dc.supportedCaps {
753 if dc.capVersion >= 302 && v != "" {
754 caps = append(caps, k+"="+v)
755 } else {
756 caps = append(caps, k)
757 }
758 }
759
760 // TODO: multi-line replies
761 dc.SendMessage(&irc.Message{
762 Prefix: dc.srv.prefix(),
763 Command: "CAP",
764 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
765 })
766
767 if dc.capVersion >= 302 {
768 // CAP version 302 implicitly enables cap-notify
769 dc.caps["cap-notify"] = true
770 }
771
772 if !dc.registered {
773 dc.negociatingCaps = true
774 }
775 case "LIST":
776 var caps []string
777 for name, enabled := range dc.caps {
778 if enabled {
779 caps = append(caps, name)
780 }
781 }
782
783 // TODO: multi-line replies
784 dc.SendMessage(&irc.Message{
785 Prefix: dc.srv.prefix(),
786 Command: "CAP",
787 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
788 })
789 case "REQ":
790 if len(args) == 0 {
791 return ircError{&irc.Message{
792 Command: err_invalidcapcmd,
793 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
794 }}
795 }
796
797 // TODO: atomically ack/nak the whole capability set
798 caps := strings.Fields(args[0])
799 ack := true
800 for _, name := range caps {
801 name = strings.ToLower(name)
802 enable := !strings.HasPrefix(name, "-")
803 if !enable {
804 name = strings.TrimPrefix(name, "-")
805 }
806
807 if enable == dc.caps[name] {
808 continue
809 }
810
811 _, ok := dc.supportedCaps[name]
812 if !ok {
813 ack = false
814 break
815 }
816
817 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
818 // cap-notify cannot be disabled with CAP version 302
819 ack = false
820 break
821 }
822
823 dc.caps[name] = enable
824 }
825
826 reply := "NAK"
827 if ack {
828 reply = "ACK"
829 }
830 dc.SendMessage(&irc.Message{
831 Prefix: dc.srv.prefix(),
832 Command: "CAP",
833 Params: []string{replyTo, reply, args[0]},
834 })
835 case "END":
836 dc.negociatingCaps = false
837 default:
838 return ircError{&irc.Message{
839 Command: err_invalidcapcmd,
840 Params: []string{replyTo, cmd, "Unknown CAP command"},
841 }}
842 }
843 return nil
844}
845
846func (dc *downstreamConn) setSupportedCap(name, value string) {
847 prevValue, hasPrev := dc.supportedCaps[name]
848 changed := !hasPrev || prevValue != value
849 dc.supportedCaps[name] = value
850
851 if !dc.caps["cap-notify"] || !changed {
852 return
853 }
854
855 replyTo := dc.nick
856 if !dc.registered {
857 replyTo = "*"
858 }
859
860 cap := name
861 if value != "" && dc.capVersion >= 302 {
862 cap = name + "=" + value
863 }
864
865 dc.SendMessage(&irc.Message{
866 Prefix: dc.srv.prefix(),
867 Command: "CAP",
868 Params: []string{replyTo, "NEW", cap},
869 })
870}
871
872func (dc *downstreamConn) unsetSupportedCap(name string) {
873 _, hasPrev := dc.supportedCaps[name]
874 delete(dc.supportedCaps, name)
875 delete(dc.caps, name)
876
877 if !dc.caps["cap-notify"] || !hasPrev {
878 return
879 }
880
881 replyTo := dc.nick
882 if !dc.registered {
883 replyTo = "*"
884 }
885
886 dc.SendMessage(&irc.Message{
887 Prefix: dc.srv.prefix(),
888 Command: "CAP",
889 Params: []string{replyTo, "DEL", name},
890 })
891}
892
893func (dc *downstreamConn) updateSupportedCaps() {
894 supportedCaps := make(map[string]bool)
895 for cap := range needAllDownstreamCaps {
896 supportedCaps[cap] = true
897 }
898 dc.forEachUpstream(func(uc *upstreamConn) {
899 for cap, supported := range supportedCaps {
900 supportedCaps[cap] = supported && uc.caps[cap]
901 }
902 })
903
904 for cap, supported := range supportedCaps {
905 if supported {
906 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
907 } else {
908 dc.unsetSupportedCap(cap)
909 }
910 }
911}
912
913func (dc *downstreamConn) updateNick() {
914 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
915 dc.SendMessage(&irc.Message{
916 Prefix: dc.prefix(),
917 Command: "NICK",
918 Params: []string{uc.nick},
919 })
920 dc.nick = uc.nick
921 dc.nickCM = casemapASCII(dc.nick)
922 }
923}
924
925func (dc *downstreamConn) updateRealname() {
926 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
927 dc.SendMessage(&irc.Message{
928 Prefix: dc.prefix(),
929 Command: "SETNAME",
930 Params: []string{uc.realname},
931 })
932 dc.realname = uc.realname
933 }
934}
935
936func sanityCheckServer(addr string) error {
937 dialer := net.Dialer{Timeout: 30 * time.Second}
938 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
939 if err != nil {
940 return err
941 }
942 return conn.Close()
943}
944
945func unmarshalUsername(rawUsername string) (username, client, network string) {
946 username = rawUsername
947
948 i := strings.IndexAny(username, "/@")
949 j := strings.LastIndexAny(username, "/@")
950 if i >= 0 {
951 username = rawUsername[:i]
952 }
953 if j >= 0 {
954 if rawUsername[j] == '@' {
955 client = rawUsername[j+1:]
956 } else {
957 network = rawUsername[j+1:]
958 }
959 }
960 if i >= 0 && j >= 0 && i < j {
961 if rawUsername[i] == '@' {
962 client = rawUsername[i+1 : j]
963 } else {
964 network = rawUsername[i+1 : j]
965 }
966 }
967
968 return username, client, network
969}
970
971func (dc *downstreamConn) authenticate(username, password string) error {
972 username, clientName, networkName := unmarshalUsername(username)
973
974 u, err := dc.srv.db.GetUser(username)
975 if err != nil {
976 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
977 return errAuthFailed
978 }
979
980 // Password auth disabled
981 if u.Password == "" {
982 return errAuthFailed
983 }
984
985 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
986 if err != nil {
987 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
988 return errAuthFailed
989 }
990
991 dc.user = dc.srv.getUser(username)
992 if dc.user == nil {
993 dc.logger.Printf("failed authentication for %q: user not active", username)
994 return errAuthFailed
995 }
996 dc.clientName = clientName
997 dc.networkName = networkName
998 return nil
999}
1000
1001func (dc *downstreamConn) register() error {
1002 if dc.registered {
1003 return fmt.Errorf("tried to register twice")
1004 }
1005
1006 password := dc.password
1007 dc.password = ""
1008 if dc.user == nil {
1009 if err := dc.authenticate(dc.rawUsername, password); err != nil {
1010 return err
1011 }
1012 }
1013
1014 if dc.clientName == "" && dc.networkName == "" {
1015 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1016 }
1017
1018 dc.registered = true
1019 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1020 return nil
1021}
1022
1023func (dc *downstreamConn) loadNetwork() error {
1024 if dc.networkName == "" {
1025 return nil
1026 }
1027
1028 network := dc.user.getNetwork(dc.networkName)
1029 if network == nil {
1030 addr := dc.networkName
1031 if !strings.ContainsRune(addr, ':') {
1032 addr = addr + ":6697"
1033 }
1034
1035 dc.logger.Printf("trying to connect to new network %q", addr)
1036 if err := sanityCheckServer(addr); err != nil {
1037 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1038 return ircError{&irc.Message{
1039 Command: irc.ERR_PASSWDMISMATCH,
1040 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1041 }}
1042 }
1043
1044 // Some clients only allow specifying the nickname (and use the
1045 // nickname as a username too). Strip the network name from the
1046 // nickname when auto-saving networks.
1047 nick, _, _ := unmarshalUsername(dc.nick)
1048
1049 dc.logger.Printf("auto-saving network %q", dc.networkName)
1050 var err error
1051 network, err = dc.user.createNetwork(&Network{
1052 Addr: dc.networkName,
1053 Nick: nick,
1054 Enabled: true,
1055 })
1056 if err != nil {
1057 return err
1058 }
1059 }
1060
1061 dc.network = network
1062 return nil
1063}
1064
1065func (dc *downstreamConn) welcome() error {
1066 if dc.user == nil || !dc.registered {
1067 panic("tried to welcome an unregistered connection")
1068 }
1069
1070 // TODO: doing this might take some time. We should do it in dc.register
1071 // instead, but we'll potentially be adding a new network and this must be
1072 // done in the user goroutine.
1073 if err := dc.loadNetwork(); err != nil {
1074 return err
1075 }
1076
1077 isupport := []string{
1078 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
1079 "CASEMAPPING=ascii",
1080 }
1081
1082 if dc.network != nil {
1083 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1084 }
1085
1086 if uc := dc.upstream(); uc != nil {
1087 for k := range passthroughIsupport {
1088 v, ok := uc.isupport[k]
1089 if !ok {
1090 continue
1091 }
1092 if v != nil {
1093 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1094 } else {
1095 isupport = append(isupport, k)
1096 }
1097 }
1098 }
1099
1100 dc.SendMessage(&irc.Message{
1101 Prefix: dc.srv.prefix(),
1102 Command: irc.RPL_WELCOME,
1103 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1104 })
1105 dc.SendMessage(&irc.Message{
1106 Prefix: dc.srv.prefix(),
1107 Command: irc.RPL_YOURHOST,
1108 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1109 })
1110 dc.SendMessage(&irc.Message{
1111 Prefix: dc.srv.prefix(),
1112 Command: irc.RPL_CREATED,
1113 Params: []string{dc.nick, "Who cares when the server was created?"},
1114 })
1115 dc.SendMessage(&irc.Message{
1116 Prefix: dc.srv.prefix(),
1117 Command: irc.RPL_MYINFO,
1118 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1119 })
1120 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1121 dc.SendMessage(msg)
1122 }
1123 motdHint := "No MOTD"
1124 if uc := dc.upstream(); uc != nil {
1125 motdHint = "Use /motd to read the message of the day"
1126 dc.SendMessage(&irc.Message{
1127 Prefix: dc.srv.prefix(),
1128 Command: irc.RPL_UMODEIS,
1129 Params: []string{dc.nick, string(uc.modes)},
1130 })
1131 }
1132 dc.SendMessage(&irc.Message{
1133 Prefix: dc.srv.prefix(),
1134 Command: irc.ERR_NOMOTD,
1135 Params: []string{dc.nick, motdHint},
1136 })
1137
1138 dc.updateNick()
1139 dc.updateRealname()
1140 dc.updateSupportedCaps()
1141
1142 if dc.caps["soju.im/bouncer-networks-notify"] {
1143 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1144 dc.user.forEachNetwork(func(network *network) {
1145 idStr := fmt.Sprintf("%v", network.ID)
1146 attrs := getNetworkAttrs(network)
1147 dc.SendMessage(&irc.Message{
1148 Tags: irc.Tags{"batch": batchRef},
1149 Prefix: dc.srv.prefix(),
1150 Command: "BOUNCER",
1151 Params: []string{"NETWORK", idStr, attrs.String()},
1152 })
1153 })
1154 })
1155 }
1156
1157 dc.forEachUpstream(func(uc *upstreamConn) {
1158 for _, entry := range uc.channels.innerMap {
1159 ch := entry.value.(*upstreamChannel)
1160 if !ch.complete {
1161 continue
1162 }
1163 record := uc.network.channels.Value(ch.Name)
1164 if record != nil && record.Detached {
1165 continue
1166 }
1167
1168 dc.SendMessage(&irc.Message{
1169 Prefix: dc.prefix(),
1170 Command: "JOIN",
1171 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1172 })
1173
1174 forwardChannel(dc, ch)
1175 }
1176 })
1177
1178 dc.forEachNetwork(func(net *network) {
1179 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1180 return
1181 }
1182
1183 // Only send history if we're the first connected client with that name
1184 // for the network
1185 firstClient := true
1186 dc.user.forEachDownstream(func(c *downstreamConn) {
1187 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1188 firstClient = false
1189 }
1190 })
1191 if firstClient {
1192 net.delivered.ForEachTarget(func(target string) {
1193 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1194 if lastDelivered == "" {
1195 return
1196 }
1197
1198 dc.sendTargetBacklog(net, target, lastDelivered)
1199
1200 // Fast-forward history to last message
1201 targetCM := net.casemap(target)
1202 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1203 if err != nil {
1204 dc.logger.Printf("failed to get last message ID: %v", err)
1205 return
1206 }
1207 net.delivered.StoreID(target, dc.clientName, lastID)
1208 })
1209 }
1210 })
1211
1212 return nil
1213}
1214
1215// messageSupportsHistory checks whether the provided message can be sent as
1216// part of an history batch.
1217func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1218 // Don't replay all messages, because that would mess up client
1219 // state. For instance we just sent the list of users, sending
1220 // PART messages for one of these users would be incorrect.
1221 // TODO: add support for draft/event-playback
1222 switch msg.Command {
1223 case "PRIVMSG", "NOTICE":
1224 return true
1225 }
1226 return false
1227}
1228
1229func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1230 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1231 return
1232 }
1233
1234 ch := net.channels.Value(target)
1235
1236 limit := 4000
1237 targetCM := net.casemap(target)
1238 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1239 if err != nil {
1240 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1241 return
1242 }
1243
1244 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1245 for _, msg := range history {
1246 if !dc.messageSupportsHistory(msg) {
1247 continue
1248 }
1249
1250 if ch != nil && ch.Detached {
1251 if net.detachedMessageNeedsRelay(ch, msg) {
1252 dc.relayDetachedMessage(net, msg)
1253 }
1254 } else {
1255 if dc.caps["batch"] {
1256 msg.Tags["batch"] = irc.TagValue(batchRef)
1257 }
1258 dc.SendMessage(dc.marshalMessage(msg, net))
1259 }
1260 }
1261 })
1262}
1263
1264func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1265 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1266 return
1267 }
1268
1269 sender := msg.Prefix.Name
1270 target, text := msg.Params[0], msg.Params[1]
1271 if net.isHighlight(msg) {
1272 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1273 } else {
1274 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1275 }
1276}
1277
1278func (dc *downstreamConn) runUntilRegistered() error {
1279 for !dc.registered {
1280 msg, err := dc.ReadMessage()
1281 if err != nil {
1282 return fmt.Errorf("failed to read IRC command: %v", err)
1283 }
1284
1285 err = dc.handleMessage(msg)
1286 if ircErr, ok := err.(ircError); ok {
1287 ircErr.Message.Prefix = dc.srv.prefix()
1288 dc.SendMessage(ircErr.Message)
1289 } else if err != nil {
1290 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1291 }
1292 }
1293
1294 return nil
1295}
1296
1297func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1298 switch msg.Command {
1299 case "CAP":
1300 var subCmd string
1301 if err := parseMessageParams(msg, &subCmd); err != nil {
1302 return err
1303 }
1304 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1305 return err
1306 }
1307 case "PING":
1308 var source, destination string
1309 if err := parseMessageParams(msg, &source); err != nil {
1310 return err
1311 }
1312 if len(msg.Params) > 1 {
1313 destination = msg.Params[1]
1314 }
1315 if destination != "" && destination != dc.srv.Hostname {
1316 return ircError{&irc.Message{
1317 Command: irc.ERR_NOSUCHSERVER,
1318 Params: []string{dc.nick, destination, "No such server"},
1319 }}
1320 }
1321 dc.SendMessage(&irc.Message{
1322 Prefix: dc.srv.prefix(),
1323 Command: "PONG",
1324 Params: []string{dc.srv.Hostname, source},
1325 })
1326 return nil
1327 case "PONG":
1328 if len(msg.Params) == 0 {
1329 return newNeedMoreParamsError(msg.Command)
1330 }
1331 token := msg.Params[len(msg.Params)-1]
1332 dc.handlePong(token)
1333 case "USER":
1334 return ircError{&irc.Message{
1335 Command: irc.ERR_ALREADYREGISTERED,
1336 Params: []string{dc.nick, "You may not reregister"},
1337 }}
1338 case "NICK":
1339 var rawNick string
1340 if err := parseMessageParams(msg, &rawNick); err != nil {
1341 return err
1342 }
1343
1344 nick := rawNick
1345 var upstream *upstreamConn
1346 if dc.upstream() == nil {
1347 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1348 if err == nil { // NICK nick/network: NICK only on a specific upstream
1349 upstream = uc
1350 nick = unmarshaledNick
1351 }
1352 }
1353
1354 if strings.ContainsAny(nick, illegalNickChars) {
1355 return ircError{&irc.Message{
1356 Command: irc.ERR_ERRONEUSNICKNAME,
1357 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1358 }}
1359 }
1360 if casemapASCII(nick) == serviceNickCM {
1361 return ircError{&irc.Message{
1362 Command: irc.ERR_NICKNAMEINUSE,
1363 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1364 }}
1365 }
1366
1367 var err error
1368 dc.forEachNetwork(func(n *network) {
1369 if err != nil || (upstream != nil && upstream.network != n) {
1370 return
1371 }
1372 n.Nick = nick
1373 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1374 })
1375 if err != nil {
1376 return err
1377 }
1378
1379 dc.forEachUpstream(func(uc *upstreamConn) {
1380 if upstream != nil && upstream != uc {
1381 return
1382 }
1383 uc.SendMessageLabeled(dc.id, &irc.Message{
1384 Command: "NICK",
1385 Params: []string{nick},
1386 })
1387 })
1388
1389 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1390 dc.SendMessage(&irc.Message{
1391 Prefix: dc.prefix(),
1392 Command: "NICK",
1393 Params: []string{nick},
1394 })
1395 dc.nick = nick
1396 dc.nickCM = casemapASCII(dc.nick)
1397 }
1398 case "SETNAME":
1399 var realname string
1400 if err := parseMessageParams(msg, &realname); err != nil {
1401 return err
1402 }
1403
1404 // If the client just resets to the default, just wipe the per-network
1405 // preference
1406 storeRealname := realname
1407 if realname == dc.user.Realname {
1408 storeRealname = ""
1409 }
1410
1411 var storeErr error
1412 var needUpdate []Network
1413 dc.forEachNetwork(func(n *network) {
1414 // We only need to call updateNetwork for upstreams that don't
1415 // support setname
1416 if uc := n.conn; uc != nil && uc.caps["setname"] {
1417 uc.SendMessageLabeled(dc.id, &irc.Message{
1418 Command: "SETNAME",
1419 Params: []string{realname},
1420 })
1421
1422 n.Realname = storeRealname
1423 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1424 dc.logger.Printf("failed to store network realname: %v", err)
1425 storeErr = err
1426 }
1427 return
1428 }
1429
1430 record := n.Network // copy network record because we'll mutate it
1431 record.Realname = storeRealname
1432 needUpdate = append(needUpdate, record)
1433 })
1434
1435 // Walk the network list as a second step, because updateNetwork
1436 // mutates the original list
1437 for _, record := range needUpdate {
1438 if _, err := dc.user.updateNetwork(&record); err != nil {
1439 dc.logger.Printf("failed to update network realname: %v", err)
1440 storeErr = err
1441 }
1442 }
1443 if storeErr != nil {
1444 return ircError{&irc.Message{
1445 Command: "FAIL",
1446 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1447 }}
1448 }
1449
1450 if dc.upstream() == nil && dc.caps["setname"] {
1451 dc.SendMessage(&irc.Message{
1452 Prefix: dc.prefix(),
1453 Command: "SETNAME",
1454 Params: []string{realname},
1455 })
1456 }
1457 case "JOIN":
1458 var namesStr string
1459 if err := parseMessageParams(msg, &namesStr); err != nil {
1460 return err
1461 }
1462
1463 var keys []string
1464 if len(msg.Params) > 1 {
1465 keys = strings.Split(msg.Params[1], ",")
1466 }
1467
1468 for i, name := range strings.Split(namesStr, ",") {
1469 uc, upstreamName, err := dc.unmarshalEntity(name)
1470 if err != nil {
1471 return err
1472 }
1473
1474 var key string
1475 if len(keys) > i {
1476 key = keys[i]
1477 }
1478
1479 if !uc.isChannel(upstreamName) {
1480 dc.SendMessage(&irc.Message{
1481 Prefix: dc.srv.prefix(),
1482 Command: irc.ERR_NOSUCHCHANNEL,
1483 Params: []string{name, "Not a channel name"},
1484 })
1485 continue
1486 }
1487
1488 params := []string{upstreamName}
1489 if key != "" {
1490 params = append(params, key)
1491 }
1492 uc.SendMessageLabeled(dc.id, &irc.Message{
1493 Command: "JOIN",
1494 Params: params,
1495 })
1496
1497 ch := uc.network.channels.Value(upstreamName)
1498 if ch != nil {
1499 // Don't clear the channel key if there's one set
1500 // TODO: add a way to unset the channel key
1501 if key != "" {
1502 ch.Key = key
1503 }
1504 uc.network.attach(ch)
1505 } else {
1506 ch = &Channel{
1507 Name: upstreamName,
1508 Key: key,
1509 }
1510 uc.network.channels.SetValue(upstreamName, ch)
1511 }
1512 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1513 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1514 }
1515 }
1516 case "PART":
1517 var namesStr string
1518 if err := parseMessageParams(msg, &namesStr); err != nil {
1519 return err
1520 }
1521
1522 var reason string
1523 if len(msg.Params) > 1 {
1524 reason = msg.Params[1]
1525 }
1526
1527 for _, name := range strings.Split(namesStr, ",") {
1528 uc, upstreamName, err := dc.unmarshalEntity(name)
1529 if err != nil {
1530 return err
1531 }
1532
1533 if strings.EqualFold(reason, "detach") {
1534 ch := uc.network.channels.Value(upstreamName)
1535 if ch != nil {
1536 uc.network.detach(ch)
1537 } else {
1538 ch = &Channel{
1539 Name: name,
1540 Detached: true,
1541 }
1542 uc.network.channels.SetValue(upstreamName, ch)
1543 }
1544 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1545 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1546 }
1547 } else {
1548 params := []string{upstreamName}
1549 if reason != "" {
1550 params = append(params, reason)
1551 }
1552 uc.SendMessageLabeled(dc.id, &irc.Message{
1553 Command: "PART",
1554 Params: params,
1555 })
1556
1557 if err := uc.network.deleteChannel(upstreamName); err != nil {
1558 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1559 }
1560 }
1561 }
1562 case "KICK":
1563 var channelStr, userStr string
1564 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1565 return err
1566 }
1567
1568 channels := strings.Split(channelStr, ",")
1569 users := strings.Split(userStr, ",")
1570
1571 var reason string
1572 if len(msg.Params) > 2 {
1573 reason = msg.Params[2]
1574 }
1575
1576 if len(channels) != 1 && len(channels) != len(users) {
1577 return ircError{&irc.Message{
1578 Command: irc.ERR_BADCHANMASK,
1579 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1580 }}
1581 }
1582
1583 for i, user := range users {
1584 var channel string
1585 if len(channels) == 1 {
1586 channel = channels[0]
1587 } else {
1588 channel = channels[i]
1589 }
1590
1591 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1592 if err != nil {
1593 return err
1594 }
1595
1596 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1597 if err != nil {
1598 return err
1599 }
1600
1601 if ucChannel != ucUser {
1602 return ircError{&irc.Message{
1603 Command: irc.ERR_USERNOTINCHANNEL,
1604 Params: []string{dc.nick, user, channel, "They are on another network"},
1605 }}
1606 }
1607 uc := ucChannel
1608
1609 params := []string{upstreamChannel, upstreamUser}
1610 if reason != "" {
1611 params = append(params, reason)
1612 }
1613 uc.SendMessageLabeled(dc.id, &irc.Message{
1614 Command: "KICK",
1615 Params: params,
1616 })
1617 }
1618 case "MODE":
1619 var name string
1620 if err := parseMessageParams(msg, &name); err != nil {
1621 return err
1622 }
1623
1624 var modeStr string
1625 if len(msg.Params) > 1 {
1626 modeStr = msg.Params[1]
1627 }
1628
1629 if casemapASCII(name) == dc.nickCM {
1630 if modeStr != "" {
1631 if uc := dc.upstream(); uc != nil {
1632 uc.SendMessageLabeled(dc.id, &irc.Message{
1633 Command: "MODE",
1634 Params: []string{uc.nick, modeStr},
1635 })
1636 } else {
1637 dc.SendMessage(&irc.Message{
1638 Prefix: dc.srv.prefix(),
1639 Command: irc.ERR_UMODEUNKNOWNFLAG,
1640 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1641 })
1642 }
1643 } else {
1644 var userMode string
1645 if uc := dc.upstream(); uc != nil {
1646 userMode = string(uc.modes)
1647 }
1648
1649 dc.SendMessage(&irc.Message{
1650 Prefix: dc.srv.prefix(),
1651 Command: irc.RPL_UMODEIS,
1652 Params: []string{dc.nick, userMode},
1653 })
1654 }
1655 return nil
1656 }
1657
1658 uc, upstreamName, err := dc.unmarshalEntity(name)
1659 if err != nil {
1660 return err
1661 }
1662
1663 if !uc.isChannel(upstreamName) {
1664 return ircError{&irc.Message{
1665 Command: irc.ERR_USERSDONTMATCH,
1666 Params: []string{dc.nick, "Cannot change mode for other users"},
1667 }}
1668 }
1669
1670 if modeStr != "" {
1671 params := []string{upstreamName, modeStr}
1672 params = append(params, msg.Params[2:]...)
1673 uc.SendMessageLabeled(dc.id, &irc.Message{
1674 Command: "MODE",
1675 Params: params,
1676 })
1677 } else {
1678 ch := uc.channels.Value(upstreamName)
1679 if ch == nil {
1680 return ircError{&irc.Message{
1681 Command: irc.ERR_NOSUCHCHANNEL,
1682 Params: []string{dc.nick, name, "No such channel"},
1683 }}
1684 }
1685
1686 if ch.modes == nil {
1687 // we haven't received the initial RPL_CHANNELMODEIS yet
1688 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1689 return nil
1690 }
1691
1692 modeStr, modeParams := ch.modes.Format()
1693 params := []string{dc.nick, name, modeStr}
1694 params = append(params, modeParams...)
1695
1696 dc.SendMessage(&irc.Message{
1697 Prefix: dc.srv.prefix(),
1698 Command: irc.RPL_CHANNELMODEIS,
1699 Params: params,
1700 })
1701 if ch.creationTime != "" {
1702 dc.SendMessage(&irc.Message{
1703 Prefix: dc.srv.prefix(),
1704 Command: rpl_creationtime,
1705 Params: []string{dc.nick, name, ch.creationTime},
1706 })
1707 }
1708 }
1709 case "TOPIC":
1710 var channel string
1711 if err := parseMessageParams(msg, &channel); err != nil {
1712 return err
1713 }
1714
1715 uc, upstreamName, err := dc.unmarshalEntity(channel)
1716 if err != nil {
1717 return err
1718 }
1719
1720 if len(msg.Params) > 1 { // setting topic
1721 topic := msg.Params[1]
1722 uc.SendMessageLabeled(dc.id, &irc.Message{
1723 Command: "TOPIC",
1724 Params: []string{upstreamName, topic},
1725 })
1726 } else { // getting topic
1727 ch := uc.channels.Value(upstreamName)
1728 if ch == nil {
1729 return ircError{&irc.Message{
1730 Command: irc.ERR_NOSUCHCHANNEL,
1731 Params: []string{dc.nick, upstreamName, "No such channel"},
1732 }}
1733 }
1734 sendTopic(dc, ch)
1735 }
1736 case "LIST":
1737 // TODO: support ELIST when supported by all upstreams
1738
1739 pl := pendingLIST{
1740 downstreamID: dc.id,
1741 pendingCommands: make(map[int64]*irc.Message),
1742 }
1743 var upstream *upstreamConn
1744 var upstreamChannels map[int64][]string
1745 if len(msg.Params) > 0 {
1746 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1747 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1748 upstream = uc
1749 } else {
1750 upstreamChannels = make(map[int64][]string)
1751 channels := strings.Split(msg.Params[0], ",")
1752 for _, channel := range channels {
1753 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1754 if err != nil {
1755 return err
1756 }
1757 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1758 }
1759 }
1760 }
1761
1762 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1763 dc.forEachUpstream(func(uc *upstreamConn) {
1764 if upstream != nil && upstream != uc {
1765 return
1766 }
1767 var params []string
1768 if upstreamChannels != nil {
1769 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1770 params = []string{strings.Join(channels, ",")}
1771 } else {
1772 return
1773 }
1774 }
1775 pl.pendingCommands[uc.network.ID] = &irc.Message{
1776 Command: "LIST",
1777 Params: params,
1778 }
1779 uc.trySendLIST(dc.id)
1780 })
1781 case "NAMES":
1782 if len(msg.Params) == 0 {
1783 dc.SendMessage(&irc.Message{
1784 Prefix: dc.srv.prefix(),
1785 Command: irc.RPL_ENDOFNAMES,
1786 Params: []string{dc.nick, "*", "End of /NAMES list"},
1787 })
1788 return nil
1789 }
1790
1791 channels := strings.Split(msg.Params[0], ",")
1792 for _, channel := range channels {
1793 uc, upstreamName, err := dc.unmarshalEntity(channel)
1794 if err != nil {
1795 return err
1796 }
1797
1798 ch := uc.channels.Value(upstreamName)
1799 if ch != nil {
1800 sendNames(dc, ch)
1801 } else {
1802 // NAMES on a channel we have not joined, ask upstream
1803 uc.SendMessageLabeled(dc.id, &irc.Message{
1804 Command: "NAMES",
1805 Params: []string{upstreamName},
1806 })
1807 }
1808 }
1809 case "WHO":
1810 if len(msg.Params) == 0 {
1811 // TODO: support WHO without parameters
1812 dc.SendMessage(&irc.Message{
1813 Prefix: dc.srv.prefix(),
1814 Command: irc.RPL_ENDOFWHO,
1815 Params: []string{dc.nick, "*", "End of /WHO list"},
1816 })
1817 return nil
1818 }
1819
1820 // TODO: support WHO masks
1821 entity := msg.Params[0]
1822 entityCM := casemapASCII(entity)
1823
1824 if dc.network == nil && entityCM == dc.nickCM {
1825 // TODO: support AWAY (H/G) in self WHO reply
1826 dc.SendMessage(&irc.Message{
1827 Prefix: dc.srv.prefix(),
1828 Command: irc.RPL_WHOREPLY,
1829 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1830 })
1831 dc.SendMessage(&irc.Message{
1832 Prefix: dc.srv.prefix(),
1833 Command: irc.RPL_ENDOFWHO,
1834 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1835 })
1836 return nil
1837 }
1838 if entityCM == serviceNickCM {
1839 dc.SendMessage(&irc.Message{
1840 Prefix: dc.srv.prefix(),
1841 Command: irc.RPL_WHOREPLY,
1842 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1843 })
1844 dc.SendMessage(&irc.Message{
1845 Prefix: dc.srv.prefix(),
1846 Command: irc.RPL_ENDOFWHO,
1847 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1848 })
1849 return nil
1850 }
1851
1852 uc, upstreamName, err := dc.unmarshalEntity(entity)
1853 if err != nil {
1854 return err
1855 }
1856
1857 var params []string
1858 if len(msg.Params) == 2 {
1859 params = []string{upstreamName, msg.Params[1]}
1860 } else {
1861 params = []string{upstreamName}
1862 }
1863
1864 uc.SendMessageLabeled(dc.id, &irc.Message{
1865 Command: "WHO",
1866 Params: params,
1867 })
1868 case "WHOIS":
1869 if len(msg.Params) == 0 {
1870 return ircError{&irc.Message{
1871 Command: irc.ERR_NONICKNAMEGIVEN,
1872 Params: []string{dc.nick, "No nickname given"},
1873 }}
1874 }
1875
1876 var target, mask string
1877 if len(msg.Params) == 1 {
1878 target = ""
1879 mask = msg.Params[0]
1880 } else {
1881 target = msg.Params[0]
1882 mask = msg.Params[1]
1883 }
1884 // TODO: support multiple WHOIS users
1885 if i := strings.IndexByte(mask, ','); i >= 0 {
1886 mask = mask[:i]
1887 }
1888
1889 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1890 dc.SendMessage(&irc.Message{
1891 Prefix: dc.srv.prefix(),
1892 Command: irc.RPL_WHOISUSER,
1893 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1894 })
1895 dc.SendMessage(&irc.Message{
1896 Prefix: dc.srv.prefix(),
1897 Command: irc.RPL_WHOISSERVER,
1898 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1899 })
1900 dc.SendMessage(&irc.Message{
1901 Prefix: dc.srv.prefix(),
1902 Command: irc.RPL_ENDOFWHOIS,
1903 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1904 })
1905 return nil
1906 }
1907
1908 // TODO: support WHOIS masks
1909 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1910 if err != nil {
1911 return err
1912 }
1913
1914 var params []string
1915 if target != "" {
1916 if target == mask { // WHOIS nick nick
1917 params = []string{upstreamNick, upstreamNick}
1918 } else {
1919 params = []string{target, upstreamNick}
1920 }
1921 } else {
1922 params = []string{upstreamNick}
1923 }
1924
1925 uc.SendMessageLabeled(dc.id, &irc.Message{
1926 Command: "WHOIS",
1927 Params: params,
1928 })
1929 case "PRIVMSG", "NOTICE":
1930 var targetsStr, text string
1931 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1932 return err
1933 }
1934 tags := copyClientTags(msg.Tags)
1935
1936 for _, name := range strings.Split(targetsStr, ",") {
1937 if name == "$"+dc.srv.Hostname || (name == "$*" && dc.network == nil) {
1938 // "$" means a server mask follows. If it's the bouncer's
1939 // hostname, broadcast the message to all bouncer users.
1940 if !dc.user.Admin {
1941 return ircError{&irc.Message{
1942 Prefix: dc.srv.prefix(),
1943 Command: irc.ERR_BADMASK,
1944 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
1945 }}
1946 }
1947
1948 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
1949
1950 broadcastTags := tags.Copy()
1951 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1952 broadcastMsg := &irc.Message{
1953 Tags: broadcastTags,
1954 Prefix: servicePrefix,
1955 Command: msg.Command,
1956 Params: []string{name, text},
1957 }
1958 dc.srv.forEachUser(func(u *user) {
1959 u.events <- eventBroadcast{broadcastMsg}
1960 })
1961 continue
1962 }
1963
1964 if dc.network == nil && casemapASCII(name) == dc.nickCM {
1965 dc.SendMessage(msg)
1966 continue
1967 }
1968
1969 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
1970 if dc.caps["echo-message"] {
1971 echoTags := tags.Copy()
1972 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1973 dc.SendMessage(&irc.Message{
1974 Tags: echoTags,
1975 Prefix: dc.prefix(),
1976 Command: msg.Command,
1977 Params: []string{name, text},
1978 })
1979 }
1980 handleServicePRIVMSG(dc, text)
1981 continue
1982 }
1983
1984 uc, upstreamName, err := dc.unmarshalEntity(name)
1985 if err != nil {
1986 return err
1987 }
1988
1989 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
1990 dc.handleNickServPRIVMSG(uc, text)
1991 }
1992
1993 unmarshaledText := text
1994 if uc.isChannel(upstreamName) {
1995 unmarshaledText = dc.unmarshalText(uc, text)
1996 }
1997 uc.SendMessageLabeled(dc.id, &irc.Message{
1998 Tags: tags,
1999 Command: msg.Command,
2000 Params: []string{upstreamName, unmarshaledText},
2001 })
2002
2003 echoTags := tags.Copy()
2004 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2005 if uc.account != "" {
2006 echoTags["account"] = irc.TagValue(uc.account)
2007 }
2008 echoMsg := &irc.Message{
2009 Tags: echoTags,
2010 Prefix: &irc.Prefix{
2011 Name: uc.nick,
2012 User: uc.username,
2013 },
2014 Command: msg.Command,
2015 Params: []string{upstreamName, text},
2016 }
2017 uc.produce(upstreamName, echoMsg, dc)
2018
2019 uc.updateChannelAutoDetach(upstreamName)
2020 }
2021 case "TAGMSG":
2022 var targetsStr string
2023 if err := parseMessageParams(msg, &targetsStr); err != nil {
2024 return err
2025 }
2026 tags := copyClientTags(msg.Tags)
2027
2028 for _, name := range strings.Split(targetsStr, ",") {
2029 uc, upstreamName, err := dc.unmarshalEntity(name)
2030 if err != nil {
2031 return err
2032 }
2033 if _, ok := uc.caps["message-tags"]; !ok {
2034 continue
2035 }
2036
2037 uc.SendMessageLabeled(dc.id, &irc.Message{
2038 Tags: tags,
2039 Command: "TAGMSG",
2040 Params: []string{upstreamName},
2041 })
2042
2043 uc.updateChannelAutoDetach(upstreamName)
2044 }
2045 case "INVITE":
2046 var user, channel string
2047 if err := parseMessageParams(msg, &user, &channel); err != nil {
2048 return err
2049 }
2050
2051 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2052 if err != nil {
2053 return err
2054 }
2055
2056 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2057 if err != nil {
2058 return err
2059 }
2060
2061 if ucChannel != ucUser {
2062 return ircError{&irc.Message{
2063 Command: irc.ERR_USERNOTINCHANNEL,
2064 Params: []string{dc.nick, user, channel, "They are on another network"},
2065 }}
2066 }
2067 uc := ucChannel
2068
2069 uc.SendMessageLabeled(dc.id, &irc.Message{
2070 Command: "INVITE",
2071 Params: []string{upstreamUser, upstreamChannel},
2072 })
2073 case "CHATHISTORY":
2074 var subcommand string
2075 if err := parseMessageParams(msg, &subcommand); err != nil {
2076 return err
2077 }
2078 var target, limitStr string
2079 var boundsStr [2]string
2080 switch subcommand {
2081 case "AFTER", "BEFORE":
2082 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2083 return err
2084 }
2085 case "BETWEEN":
2086 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2087 return err
2088 }
2089 case "TARGETS":
2090 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2091 return err
2092 }
2093 default:
2094 // TODO: support LATEST, AROUND
2095 return ircError{&irc.Message{
2096 Command: "FAIL",
2097 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2098 }}
2099 }
2100
2101 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2102 if !ok {
2103 return ircError{&irc.Message{
2104 Command: irc.ERR_UNKNOWNCOMMAND,
2105 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2106 }}
2107 }
2108
2109 network, entity, err := dc.unmarshalEntityNetwork(target)
2110 if err != nil {
2111 return err
2112 }
2113 entity = network.casemap(entity)
2114
2115 // TODO: support msgid criteria
2116 var bounds [2]time.Time
2117 bounds[0] = parseChatHistoryBound(boundsStr[0])
2118 if bounds[0].IsZero() {
2119 return ircError{&irc.Message{
2120 Command: "FAIL",
2121 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2122 }}
2123 }
2124
2125 if boundsStr[1] != "" {
2126 bounds[1] = parseChatHistoryBound(boundsStr[1])
2127 if bounds[1].IsZero() {
2128 return ircError{&irc.Message{
2129 Command: "FAIL",
2130 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2131 }}
2132 }
2133 }
2134
2135 limit, err := strconv.Atoi(limitStr)
2136 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
2137 return ircError{&irc.Message{
2138 Command: "FAIL",
2139 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2140 }}
2141 }
2142
2143 var history []*irc.Message
2144 switch subcommand {
2145 case "BEFORE":
2146 history, err = store.LoadBeforeTime(network, entity, bounds[0], time.Time{}, limit)
2147 case "AFTER":
2148 history, err = store.LoadAfterTime(network, entity, bounds[0], time.Now(), limit)
2149 case "BETWEEN":
2150 if bounds[0].Before(bounds[1]) {
2151 history, err = store.LoadAfterTime(network, entity, bounds[0], bounds[1], limit)
2152 } else {
2153 history, err = store.LoadBeforeTime(network, entity, bounds[0], bounds[1], limit)
2154 }
2155 case "TARGETS":
2156 // TODO: support TARGETS in multi-upstream mode
2157 targets, err := store.ListTargets(network, bounds[0], bounds[1], limit)
2158 if err != nil {
2159 dc.logger.Printf("failed fetching targets for chathistory: %v", target, err)
2160 return ircError{&irc.Message{
2161 Command: "FAIL",
2162 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2163 }}
2164 }
2165
2166 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2167 for _, target := range targets {
2168 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2169 continue
2170 }
2171
2172 dc.SendMessage(&irc.Message{
2173 Tags: irc.Tags{"batch": batchRef},
2174 Prefix: dc.srv.prefix(),
2175 Command: "CHATHISTORY",
2176 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2177 })
2178 }
2179 })
2180
2181 return nil
2182 }
2183 if err != nil {
2184 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2185 return newChatHistoryError(subcommand, target)
2186 }
2187
2188 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2189 for _, msg := range history {
2190 msg.Tags["batch"] = batchRef
2191 dc.SendMessage(dc.marshalMessage(msg, network))
2192 }
2193 })
2194 case "BOUNCER":
2195 var subcommand string
2196 if err := parseMessageParams(msg, &subcommand); err != nil {
2197 return err
2198 }
2199
2200 switch strings.ToUpper(subcommand) {
2201 case "LISTNETWORKS":
2202 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2203 dc.user.forEachNetwork(func(network *network) {
2204 idStr := fmt.Sprintf("%v", network.ID)
2205 attrs := getNetworkAttrs(network)
2206 dc.SendMessage(&irc.Message{
2207 Tags: irc.Tags{"batch": batchRef},
2208 Prefix: dc.srv.prefix(),
2209 Command: "BOUNCER",
2210 Params: []string{"NETWORK", idStr, attrs.String()},
2211 })
2212 })
2213 })
2214 case "ADDNETWORK":
2215 var attrsStr string
2216 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2217 return err
2218 }
2219 attrs := irc.ParseTags(attrsStr)
2220
2221 host, ok := attrs.GetTag("host")
2222 if !ok {
2223 return ircError{&irc.Message{
2224 Command: "FAIL",
2225 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
2226 }}
2227 }
2228
2229 addr := host
2230 if port, ok := attrs.GetTag("port"); ok {
2231 addr += ":" + port
2232 }
2233
2234 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
2235 addr = "irc+insecure://" + tlsStr
2236 }
2237
2238 nick, ok := attrs.GetTag("nickname")
2239 if !ok {
2240 nick = dc.nick
2241 }
2242
2243 username, _ := attrs.GetTag("username")
2244 realname, _ := attrs.GetTag("realname")
2245 pass, _ := attrs.GetTag("pass")
2246
2247 if realname == dc.user.Realname {
2248 realname = ""
2249 }
2250
2251 // TODO: reject unknown attributes
2252
2253 record := &Network{
2254 Addr: addr,
2255 Nick: nick,
2256 Username: username,
2257 Realname: realname,
2258 Pass: pass,
2259 Enabled: true,
2260 }
2261 network, err := dc.user.createNetwork(record)
2262 if err != nil {
2263 return ircError{&irc.Message{
2264 Command: "FAIL",
2265 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2266 }}
2267 }
2268
2269 dc.SendMessage(&irc.Message{
2270 Prefix: dc.srv.prefix(),
2271 Command: "BOUNCER",
2272 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2273 })
2274 case "CHANGENETWORK":
2275 var idStr, attrsStr string
2276 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2277 return err
2278 }
2279 id, err := parseBouncerNetID(subcommand, idStr)
2280 if err != nil {
2281 return err
2282 }
2283 attrs := irc.ParseTags(attrsStr)
2284
2285 net := dc.user.getNetworkByID(id)
2286 if net == nil {
2287 return ircError{&irc.Message{
2288 Command: "FAIL",
2289 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2290 }}
2291 }
2292
2293 record := net.Network // copy network record because we'll mutate it
2294 for k, v := range attrs {
2295 s := string(v)
2296 switch k {
2297 // TODO: host, port, tls
2298 case "nickname":
2299 record.Nick = s
2300 case "username":
2301 record.Username = s
2302 case "realname":
2303 record.Realname = s
2304 case "pass":
2305 record.Pass = s
2306 default:
2307 return ircError{&irc.Message{
2308 Command: "FAIL",
2309 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
2310 }}
2311 }
2312 }
2313
2314 _, err = dc.user.updateNetwork(&record)
2315 if err != nil {
2316 return ircError{&irc.Message{
2317 Command: "FAIL",
2318 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2319 }}
2320 }
2321
2322 dc.SendMessage(&irc.Message{
2323 Prefix: dc.srv.prefix(),
2324 Command: "BOUNCER",
2325 Params: []string{"CHANGENETWORK", idStr},
2326 })
2327 case "DELNETWORK":
2328 var idStr string
2329 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2330 return err
2331 }
2332 id, err := parseBouncerNetID(subcommand, idStr)
2333 if err != nil {
2334 return err
2335 }
2336
2337 net := dc.user.getNetworkByID(id)
2338 if net == nil {
2339 return ircError{&irc.Message{
2340 Command: "FAIL",
2341 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2342 }}
2343 }
2344
2345 if err := dc.user.deleteNetwork(net.ID); err != nil {
2346 return err
2347 }
2348
2349 dc.SendMessage(&irc.Message{
2350 Prefix: dc.srv.prefix(),
2351 Command: "BOUNCER",
2352 Params: []string{"DELNETWORK", idStr},
2353 })
2354 default:
2355 return ircError{&irc.Message{
2356 Command: "FAIL",
2357 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2358 }}
2359 }
2360 default:
2361 dc.logger.Printf("unhandled message: %v", msg)
2362
2363 // Only forward unknown commands in single-upstream mode
2364 uc := dc.upstream()
2365 if uc == nil {
2366 return newUnknownCommandError(msg.Command)
2367 }
2368
2369 uc.SendMessageLabeled(dc.id, msg)
2370 }
2371 return nil
2372}
2373
2374func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2375 username, password, ok := parseNickServCredentials(text, uc.nick)
2376 if !ok {
2377 return
2378 }
2379
2380 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2381 // automatically erase the key pair or any other credentials.
2382 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2383 return
2384 }
2385
2386 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2387 n := uc.network
2388 n.SASL.Mechanism = "PLAIN"
2389 n.SASL.Plain.Username = username
2390 n.SASL.Plain.Password = password
2391 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
2392 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2393 }
2394}
2395
2396func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2397 fields := strings.Fields(text)
2398 if len(fields) < 2 {
2399 return "", "", false
2400 }
2401 cmd := strings.ToUpper(fields[0])
2402 params := fields[1:]
2403 switch cmd {
2404 case "REGISTER":
2405 username = nick
2406 password = params[0]
2407 case "IDENTIFY":
2408 if len(params) == 1 {
2409 username = nick
2410 password = params[0]
2411 } else {
2412 username = params[0]
2413 password = params[1]
2414 }
2415 case "SET":
2416 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2417 username = nick
2418 password = params[1]
2419 }
2420 default:
2421 return "", "", false
2422 }
2423 return username, password, true
2424}
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