source: code/trunk/downstream.go@ 482

Last change on this file since 482 was 482, checked in by contact, 4 years ago

Simplify network.offlineClients

Replace it with a list of all clients (online or offline).
File size: 47.5 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
61// '*' and '?' break masks
62const illegalNickChars = " :@!*?"
63
64// permanentDownstreamCaps is the list of always-supported downstream
65// capabilities.
66var permanentDownstreamCaps = map[string]string{
67 "batch": "",
68 "cap-notify": "",
69 "echo-message": "",
70 "invite-notify": "",
71 "message-tags": "",
72 "sasl": "PLAIN",
73 "server-time": "",
74}
75
76// needAllDownstreamCaps is the list of downstream capabilities that
77// require support from all upstreams to be enabled
78var needAllDownstreamCaps = map[string]string{
79 "away-notify": "",
80 "extended-join": "",
81 "multi-prefix": "",
82}
83
84// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
85// through from the upstream server to downstream clients.
86//
87// This is only effective in single-upstream mode.
88var passthroughIsupport = map[string]bool{
89 "AWAYLEN": true,
90 "CHANLIMIT": true,
91 "CHANMODES": true,
92 "CHANNELLEN": true,
93 "CHANTYPES": true,
94 "EXCEPTS": true,
95 "EXTBAN": true,
96 "HOSTLEN": true,
97 "INVEX": true,
98 "KICKLEN": true,
99 "MAXLIST": true,
100 "MAXTARGETS": true,
101 "MODES": true,
102 "NETWORK": true,
103 "NICKLEN": true,
104 "PREFIX": true,
105 "SAFELIST": true,
106 "TARGMAX": true,
107 "TOPICLEN": true,
108 "USERLEN": true,
109}
110
111type downstreamConn struct {
112 conn
113
114 id uint64
115
116 registered bool
117 user *user
118 nick string
119 nickCM string
120 rawUsername string
121 networkName string
122 clientName string
123 realname string
124 hostname string
125 password string // empty after authentication
126 network *network // can be nil
127
128 negociatingCaps bool
129 capVersion int
130 supportedCaps map[string]string
131 caps map[string]bool
132
133 saslServer sasl.Server
134}
135
136func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
137 remoteAddr := ic.RemoteAddr().String()
138 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
139 options := connOptions{Logger: logger}
140 dc := &downstreamConn{
141 conn: *newConn(srv, ic, &options),
142 id: id,
143 supportedCaps: make(map[string]string),
144 caps: make(map[string]bool),
145 }
146 dc.hostname = remoteAddr
147 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
148 dc.hostname = host
149 }
150 for k, v := range permanentDownstreamCaps {
151 dc.supportedCaps[k] = v
152 }
153 if srv.LogPath != "" {
154 dc.supportedCaps["draft/chathistory"] = ""
155 }
156 return dc
157}
158
159func (dc *downstreamConn) prefix() *irc.Prefix {
160 return &irc.Prefix{
161 Name: dc.nick,
162 User: dc.user.Username,
163 Host: dc.hostname,
164 }
165}
166
167func (dc *downstreamConn) forEachNetwork(f func(*network)) {
168 if dc.network != nil {
169 f(dc.network)
170 } else {
171 dc.user.forEachNetwork(f)
172 }
173}
174
175func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
176 dc.user.forEachUpstream(func(uc *upstreamConn) {
177 if dc.network != nil && uc.network != dc.network {
178 return
179 }
180 f(uc)
181 })
182}
183
184// upstream returns the upstream connection, if any. If there are zero or if
185// there are multiple upstream connections, it returns nil.
186func (dc *downstreamConn) upstream() *upstreamConn {
187 if dc.network == nil {
188 return nil
189 }
190 return dc.network.conn
191}
192
193func isOurNick(net *network, nick string) bool {
194 // TODO: this doesn't account for nick changes
195 if net.conn != nil {
196 return net.casemap(nick) == net.conn.nickCM
197 }
198 // We're not currently connected to the upstream connection, so we don't
199 // know whether this name is our nickname. Best-effort: use the network's
200 // configured nickname and hope it was the one being used when we were
201 // connected.
202 return net.casemap(nick) == net.casemap(net.Nick)
203}
204
205// marshalEntity converts an upstream entity name (ie. channel or nick) into a
206// downstream entity name.
207//
208// This involves adding a "/<network>" suffix if the entity isn't the current
209// user.
210func (dc *downstreamConn) marshalEntity(net *network, name string) string {
211 if isOurNick(net, name) {
212 return dc.nick
213 }
214 name = partialCasemap(net.casemap, name)
215 if dc.network != nil {
216 if dc.network != net {
217 panic("soju: tried to marshal an entity for another network")
218 }
219 return name
220 }
221 return name + "/" + net.GetName()
222}
223
224func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
225 if isOurNick(net, prefix.Name) {
226 return dc.prefix()
227 }
228 prefix.Name = partialCasemap(net.casemap, prefix.Name)
229 if dc.network != nil {
230 if dc.network != net {
231 panic("soju: tried to marshal a user prefix for another network")
232 }
233 return prefix
234 }
235 return &irc.Prefix{
236 Name: prefix.Name + "/" + net.GetName(),
237 User: prefix.User,
238 Host: prefix.Host,
239 }
240}
241
242// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
243// an upstream entity name.
244//
245// This involves removing the "/<network>" suffix.
246func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
247 if uc := dc.upstream(); uc != nil {
248 return uc, name, nil
249 }
250 if dc.network != nil {
251 return nil, "", ircError{&irc.Message{
252 Command: irc.ERR_NOSUCHCHANNEL,
253 Params: []string{name, "Disconnected from upstream network"},
254 }}
255 }
256
257 var conn *upstreamConn
258 if i := strings.LastIndexByte(name, '/'); i >= 0 {
259 network := name[i+1:]
260 name = name[:i]
261
262 dc.forEachUpstream(func(uc *upstreamConn) {
263 if network != uc.network.GetName() {
264 return
265 }
266 conn = uc
267 })
268 }
269
270 if conn == nil {
271 return nil, "", ircError{&irc.Message{
272 Command: irc.ERR_NOSUCHCHANNEL,
273 Params: []string{name, "Missing network suffix in channel name"},
274 }}
275 }
276 return conn, name, nil
277}
278
279func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
280 if dc.upstream() != nil {
281 return text
282 }
283 // TODO: smarter parsing that ignores URLs
284 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
285}
286
287func (dc *downstreamConn) readMessages(ch chan<- event) error {
288 for {
289 msg, err := dc.ReadMessage()
290 if err == io.EOF {
291 break
292 } else if err != nil {
293 return fmt.Errorf("failed to read IRC command: %v", err)
294 }
295
296 ch <- eventDownstreamMessage{msg, dc}
297 }
298
299 return nil
300}
301
302// SendMessage sends an outgoing message.
303//
304// This can only called from the user goroutine.
305func (dc *downstreamConn) SendMessage(msg *irc.Message) {
306 if !dc.caps["message-tags"] {
307 if msg.Command == "TAGMSG" {
308 return
309 }
310 msg = msg.Copy()
311 for name := range msg.Tags {
312 supported := false
313 switch name {
314 case "time":
315 supported = dc.caps["server-time"]
316 }
317 if !supported {
318 delete(msg.Tags, name)
319 }
320 }
321 }
322 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
323 msg.Params = msg.Params[:1]
324 }
325
326 dc.conn.SendMessage(msg)
327}
328
329// sendMessageWithID sends an outgoing message with the specified internal ID.
330func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
331 dc.SendMessage(msg)
332
333 if id == "" || !dc.messageSupportsHistory(msg) {
334 return
335 }
336
337 dc.sendPing(id)
338}
339
340// advanceMessageWithID advances history to the specified message ID without
341// sending a message. This is useful e.g. for self-messages when echo-message
342// isn't enabled.
343func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
344 if id == "" || !dc.messageSupportsHistory(msg) {
345 return
346 }
347
348 dc.sendPing(id)
349}
350
351// ackMsgID acknowledges that a message has been received.
352func (dc *downstreamConn) ackMsgID(id string) {
353 netID, entity, _, err := parseMsgID(id)
354 if err != nil {
355 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
356 return
357 }
358
359 network := dc.user.getNetworkByID(netID)
360 if network == nil {
361 return
362 }
363
364 delivered := network.delivered.Value(entity)
365 if delivered == nil {
366 return
367 }
368
369 delivered[dc.clientName] = id
370}
371
372func (dc *downstreamConn) sendPing(msgID string) {
373 token := "soju-msgid-" + base64.RawURLEncoding.EncodeToString([]byte(msgID))
374 dc.SendMessage(&irc.Message{
375 Command: "PING",
376 Params: []string{token},
377 })
378}
379
380func (dc *downstreamConn) handlePong(token string) {
381 if !strings.HasPrefix(token, "soju-msgid-") {
382 dc.logger.Printf("received unrecognized PONG token %q", token)
383 return
384 }
385 token = strings.TrimPrefix(token, "soju-msgid-")
386 b, err := base64.RawURLEncoding.DecodeString(token)
387 if err != nil {
388 dc.logger.Printf("received malformed PONG token: %v", err)
389 return
390 }
391 msgID := string(b)
392
393 dc.ackMsgID(msgID)
394}
395
396// marshalMessage re-formats a message coming from an upstream connection so
397// that it's suitable for being sent on this downstream connection. Only
398// messages that may appear in logs are supported, except MODE.
399func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
400 msg = msg.Copy()
401 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
402
403 switch msg.Command {
404 case "PRIVMSG", "NOTICE", "TAGMSG":
405 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
406 case "NICK":
407 // Nick change for another user
408 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
409 case "JOIN", "PART":
410 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
411 case "KICK":
412 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
413 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
414 case "TOPIC":
415 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
416 case "QUIT":
417 // This space is intentionally left blank
418 default:
419 panic(fmt.Sprintf("unexpected %q message", msg.Command))
420 }
421
422 return msg
423}
424
425func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
426 switch msg.Command {
427 case "QUIT":
428 return dc.Close()
429 default:
430 if dc.registered {
431 return dc.handleMessageRegistered(msg)
432 } else {
433 return dc.handleMessageUnregistered(msg)
434 }
435 }
436}
437
438func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
439 switch msg.Command {
440 case "NICK":
441 var nick string
442 if err := parseMessageParams(msg, &nick); err != nil {
443 return err
444 }
445 if strings.ContainsAny(nick, illegalNickChars) {
446 return ircError{&irc.Message{
447 Command: irc.ERR_ERRONEUSNICKNAME,
448 Params: []string{dc.nick, nick, "contains illegal characters"},
449 }}
450 }
451 nickCM := casemapASCII(nick)
452 if nickCM == serviceNickCM {
453 return ircError{&irc.Message{
454 Command: irc.ERR_NICKNAMEINUSE,
455 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
456 }}
457 }
458 dc.nick = nick
459 dc.nickCM = nickCM
460 case "USER":
461 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
462 return err
463 }
464 case "PASS":
465 if err := parseMessageParams(msg, &dc.password); err != nil {
466 return err
467 }
468 case "CAP":
469 var subCmd string
470 if err := parseMessageParams(msg, &subCmd); err != nil {
471 return err
472 }
473 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
474 return err
475 }
476 case "AUTHENTICATE":
477 if !dc.caps["sasl"] {
478 return ircError{&irc.Message{
479 Command: irc.ERR_SASLFAIL,
480 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
481 }}
482 }
483 if len(msg.Params) == 0 {
484 return ircError{&irc.Message{
485 Command: irc.ERR_SASLFAIL,
486 Params: []string{"*", "Missing AUTHENTICATE argument"},
487 }}
488 }
489 if dc.nick == "" {
490 return ircError{&irc.Message{
491 Command: irc.ERR_SASLFAIL,
492 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
493 }}
494 }
495
496 var resp []byte
497 if dc.saslServer == nil {
498 mech := strings.ToUpper(msg.Params[0])
499 switch mech {
500 case "PLAIN":
501 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
502 return dc.authenticate(username, password)
503 }))
504 default:
505 return ircError{&irc.Message{
506 Command: irc.ERR_SASLFAIL,
507 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
508 }}
509 }
510 } else if msg.Params[0] == "*" {
511 dc.saslServer = nil
512 return ircError{&irc.Message{
513 Command: irc.ERR_SASLABORTED,
514 Params: []string{"*", "SASL authentication aborted"},
515 }}
516 } else if msg.Params[0] == "+" {
517 resp = nil
518 } else {
519 // TODO: multi-line messages
520 var err error
521 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
522 if err != nil {
523 dc.saslServer = nil
524 return ircError{&irc.Message{
525 Command: irc.ERR_SASLFAIL,
526 Params: []string{"*", "Invalid base64-encoded response"},
527 }}
528 }
529 }
530
531 challenge, done, err := dc.saslServer.Next(resp)
532 if err != nil {
533 dc.saslServer = nil
534 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
535 return ircError{&irc.Message{
536 Command: irc.ERR_SASLFAIL,
537 Params: []string{"*", ircErr.Message.Params[1]},
538 }}
539 }
540 dc.SendMessage(&irc.Message{
541 Prefix: dc.srv.prefix(),
542 Command: irc.ERR_SASLFAIL,
543 Params: []string{"*", "SASL error"},
544 })
545 return fmt.Errorf("SASL authentication failed: %v", err)
546 } else if done {
547 dc.saslServer = nil
548 dc.SendMessage(&irc.Message{
549 Prefix: dc.srv.prefix(),
550 Command: irc.RPL_LOGGEDIN,
551 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
552 })
553 dc.SendMessage(&irc.Message{
554 Prefix: dc.srv.prefix(),
555 Command: irc.RPL_SASLSUCCESS,
556 Params: []string{dc.nick, "SASL authentication successful"},
557 })
558 } else {
559 challengeStr := "+"
560 if len(challenge) > 0 {
561 challengeStr = base64.StdEncoding.EncodeToString(challenge)
562 }
563
564 // TODO: multi-line messages
565 dc.SendMessage(&irc.Message{
566 Prefix: dc.srv.prefix(),
567 Command: "AUTHENTICATE",
568 Params: []string{challengeStr},
569 })
570 }
571 default:
572 dc.logger.Printf("unhandled message: %v", msg)
573 return newUnknownCommandError(msg.Command)
574 }
575 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
576 return dc.register()
577 }
578 return nil
579}
580
581func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
582 cmd = strings.ToUpper(cmd)
583
584 replyTo := dc.nick
585 if !dc.registered {
586 replyTo = "*"
587 }
588
589 switch cmd {
590 case "LS":
591 if len(args) > 0 {
592 var err error
593 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
594 return err
595 }
596 }
597 if !dc.registered && dc.capVersion >= 302 {
598 // Let downstream show everything it supports, and trim
599 // down the available capabilities when upstreams are
600 // known.
601 for k, v := range needAllDownstreamCaps {
602 dc.supportedCaps[k] = v
603 }
604 }
605
606 caps := make([]string, 0, len(dc.supportedCaps))
607 for k, v := range dc.supportedCaps {
608 if dc.capVersion >= 302 && v != "" {
609 caps = append(caps, k+"="+v)
610 } else {
611 caps = append(caps, k)
612 }
613 }
614
615 // TODO: multi-line replies
616 dc.SendMessage(&irc.Message{
617 Prefix: dc.srv.prefix(),
618 Command: "CAP",
619 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
620 })
621
622 if dc.capVersion >= 302 {
623 // CAP version 302 implicitly enables cap-notify
624 dc.caps["cap-notify"] = true
625 }
626
627 if !dc.registered {
628 dc.negociatingCaps = true
629 }
630 case "LIST":
631 var caps []string
632 for name := range dc.caps {
633 caps = append(caps, name)
634 }
635
636 // TODO: multi-line replies
637 dc.SendMessage(&irc.Message{
638 Prefix: dc.srv.prefix(),
639 Command: "CAP",
640 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
641 })
642 case "REQ":
643 if len(args) == 0 {
644 return ircError{&irc.Message{
645 Command: err_invalidcapcmd,
646 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
647 }}
648 }
649
650 // TODO: atomically ack/nak the whole capability set
651 caps := strings.Fields(args[0])
652 ack := true
653 for _, name := range caps {
654 name = strings.ToLower(name)
655 enable := !strings.HasPrefix(name, "-")
656 if !enable {
657 name = strings.TrimPrefix(name, "-")
658 }
659
660 if enable == dc.caps[name] {
661 continue
662 }
663
664 _, ok := dc.supportedCaps[name]
665 if !ok {
666 ack = false
667 break
668 }
669
670 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
671 // cap-notify cannot be disabled with CAP version 302
672 ack = false
673 break
674 }
675
676 dc.caps[name] = enable
677 }
678
679 reply := "NAK"
680 if ack {
681 reply = "ACK"
682 }
683 dc.SendMessage(&irc.Message{
684 Prefix: dc.srv.prefix(),
685 Command: "CAP",
686 Params: []string{replyTo, reply, args[0]},
687 })
688 case "END":
689 dc.negociatingCaps = false
690 default:
691 return ircError{&irc.Message{
692 Command: err_invalidcapcmd,
693 Params: []string{replyTo, cmd, "Unknown CAP command"},
694 }}
695 }
696 return nil
697}
698
699func (dc *downstreamConn) setSupportedCap(name, value string) {
700 prevValue, hasPrev := dc.supportedCaps[name]
701 changed := !hasPrev || prevValue != value
702 dc.supportedCaps[name] = value
703
704 if !dc.caps["cap-notify"] || !changed {
705 return
706 }
707
708 replyTo := dc.nick
709 if !dc.registered {
710 replyTo = "*"
711 }
712
713 cap := name
714 if value != "" && dc.capVersion >= 302 {
715 cap = name + "=" + value
716 }
717
718 dc.SendMessage(&irc.Message{
719 Prefix: dc.srv.prefix(),
720 Command: "CAP",
721 Params: []string{replyTo, "NEW", cap},
722 })
723}
724
725func (dc *downstreamConn) unsetSupportedCap(name string) {
726 _, hasPrev := dc.supportedCaps[name]
727 delete(dc.supportedCaps, name)
728 delete(dc.caps, name)
729
730 if !dc.caps["cap-notify"] || !hasPrev {
731 return
732 }
733
734 replyTo := dc.nick
735 if !dc.registered {
736 replyTo = "*"
737 }
738
739 dc.SendMessage(&irc.Message{
740 Prefix: dc.srv.prefix(),
741 Command: "CAP",
742 Params: []string{replyTo, "DEL", name},
743 })
744}
745
746func (dc *downstreamConn) updateSupportedCaps() {
747 supportedCaps := make(map[string]bool)
748 for cap := range needAllDownstreamCaps {
749 supportedCaps[cap] = true
750 }
751 dc.forEachUpstream(func(uc *upstreamConn) {
752 for cap, supported := range supportedCaps {
753 supportedCaps[cap] = supported && uc.caps[cap]
754 }
755 })
756
757 for cap, supported := range supportedCaps {
758 if supported {
759 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
760 } else {
761 dc.unsetSupportedCap(cap)
762 }
763 }
764}
765
766func (dc *downstreamConn) updateNick() {
767 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
768 dc.SendMessage(&irc.Message{
769 Prefix: dc.prefix(),
770 Command: "NICK",
771 Params: []string{uc.nick},
772 })
773 dc.nick = uc.nick
774 dc.nickCM = casemapASCII(dc.nick)
775 }
776}
777
778func sanityCheckServer(addr string) error {
779 dialer := net.Dialer{Timeout: 30 * time.Second}
780 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
781 if err != nil {
782 return err
783 }
784 return conn.Close()
785}
786
787func unmarshalUsername(rawUsername string) (username, client, network string) {
788 username = rawUsername
789
790 i := strings.IndexAny(username, "/@")
791 j := strings.LastIndexAny(username, "/@")
792 if i >= 0 {
793 username = rawUsername[:i]
794 }
795 if j >= 0 {
796 if rawUsername[j] == '@' {
797 client = rawUsername[j+1:]
798 } else {
799 network = rawUsername[j+1:]
800 }
801 }
802 if i >= 0 && j >= 0 && i < j {
803 if rawUsername[i] == '@' {
804 client = rawUsername[i+1 : j]
805 } else {
806 network = rawUsername[i+1 : j]
807 }
808 }
809
810 return username, client, network
811}
812
813func (dc *downstreamConn) authenticate(username, password string) error {
814 username, clientName, networkName := unmarshalUsername(username)
815
816 u, err := dc.srv.db.GetUser(username)
817 if err != nil {
818 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
819 return errAuthFailed
820 }
821
822 // Password auth disabled
823 if u.Password == "" {
824 return errAuthFailed
825 }
826
827 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
828 if err != nil {
829 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
830 return errAuthFailed
831 }
832
833 dc.user = dc.srv.getUser(username)
834 if dc.user == nil {
835 dc.logger.Printf("failed authentication for %q: user not active", username)
836 return errAuthFailed
837 }
838 dc.clientName = clientName
839 dc.networkName = networkName
840 return nil
841}
842
843func (dc *downstreamConn) register() error {
844 if dc.registered {
845 return fmt.Errorf("tried to register twice")
846 }
847
848 password := dc.password
849 dc.password = ""
850 if dc.user == nil {
851 if err := dc.authenticate(dc.rawUsername, password); err != nil {
852 return err
853 }
854 }
855
856 if dc.clientName == "" && dc.networkName == "" {
857 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
858 }
859
860 dc.registered = true
861 dc.logger.Printf("registration complete for user %q", dc.user.Username)
862 return nil
863}
864
865func (dc *downstreamConn) loadNetwork() error {
866 if dc.networkName == "" {
867 return nil
868 }
869
870 network := dc.user.getNetwork(dc.networkName)
871 if network == nil {
872 addr := dc.networkName
873 if !strings.ContainsRune(addr, ':') {
874 addr = addr + ":6697"
875 }
876
877 dc.logger.Printf("trying to connect to new network %q", addr)
878 if err := sanityCheckServer(addr); err != nil {
879 dc.logger.Printf("failed to connect to %q: %v", addr, err)
880 return ircError{&irc.Message{
881 Command: irc.ERR_PASSWDMISMATCH,
882 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
883 }}
884 }
885
886 // Some clients only allow specifying the nickname (and use the
887 // nickname as a username too). Strip the network name from the
888 // nickname when auto-saving networks.
889 nick, _, _ := unmarshalUsername(dc.nick)
890
891 dc.logger.Printf("auto-saving network %q", dc.networkName)
892 var err error
893 network, err = dc.user.createNetwork(&Network{
894 Addr: dc.networkName,
895 Nick: nick,
896 })
897 if err != nil {
898 return err
899 }
900 }
901
902 dc.network = network
903 return nil
904}
905
906func (dc *downstreamConn) welcome() error {
907 if dc.user == nil || !dc.registered {
908 panic("tried to welcome an unregistered connection")
909 }
910
911 // TODO: doing this might take some time. We should do it in dc.register
912 // instead, but we'll potentially be adding a new network and this must be
913 // done in the user goroutine.
914 if err := dc.loadNetwork(); err != nil {
915 return err
916 }
917
918 isupport := []string{
919 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
920 "CASEMAPPING=ascii",
921 }
922
923 if uc := dc.upstream(); uc != nil {
924 for k := range passthroughIsupport {
925 v, ok := uc.isupport[k]
926 if !ok {
927 continue
928 }
929 if v != nil {
930 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
931 } else {
932 isupport = append(isupport, k)
933 }
934 }
935 }
936
937 dc.SendMessage(&irc.Message{
938 Prefix: dc.srv.prefix(),
939 Command: irc.RPL_WELCOME,
940 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
941 })
942 dc.SendMessage(&irc.Message{
943 Prefix: dc.srv.prefix(),
944 Command: irc.RPL_YOURHOST,
945 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
946 })
947 dc.SendMessage(&irc.Message{
948 Prefix: dc.srv.prefix(),
949 Command: irc.RPL_CREATED,
950 Params: []string{dc.nick, "Who cares when the server was created?"},
951 })
952 dc.SendMessage(&irc.Message{
953 Prefix: dc.srv.prefix(),
954 Command: irc.RPL_MYINFO,
955 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
956 })
957 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
958 dc.SendMessage(msg)
959 }
960 dc.SendMessage(&irc.Message{
961 Prefix: dc.srv.prefix(),
962 Command: irc.ERR_NOMOTD,
963 Params: []string{dc.nick, "No MOTD"},
964 })
965
966 dc.updateNick()
967 dc.updateSupportedCaps()
968
969 dc.forEachUpstream(func(uc *upstreamConn) {
970 for _, entry := range uc.channels.innerMap {
971 ch := entry.value.(*upstreamChannel)
972 if !ch.complete {
973 continue
974 }
975 record := uc.network.channels.Value(ch.Name)
976 if record != nil && record.Detached {
977 continue
978 }
979
980 dc.SendMessage(&irc.Message{
981 Prefix: dc.prefix(),
982 Command: "JOIN",
983 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
984 })
985
986 forwardChannel(dc, ch)
987 }
988 })
989
990 dc.forEachNetwork(func(net *network) {
991 // Only send history if we're the first connected client with that name
992 // for the network
993 firstClient := true
994 dc.user.forEachDownstream(func(c *downstreamConn) {
995 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
996 firstClient = false
997 }
998 })
999 if firstClient {
1000 dc.sendNetworkBacklog(net)
1001 }
1002
1003 // Fast-forward history to last message
1004 for target, entry := range net.delivered.innerMap {
1005 delivered := entry.value.(deliveredClientMap)
1006 ch := net.channels.Value(target)
1007 if ch != nil && ch.Detached {
1008 continue
1009 }
1010
1011 lastID, err := dc.user.msgStore.LastMsgID(net, target, time.Now())
1012 if err != nil {
1013 dc.logger.Printf("failed to get last message ID: %v", err)
1014 continue
1015 }
1016 delivered[dc.clientName] = lastID
1017 }
1018 })
1019
1020 return nil
1021}
1022
1023// messageSupportsHistory checks whether the provided message can be sent as
1024// part of an history batch.
1025func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1026 // Don't replay all messages, because that would mess up client
1027 // state. For instance we just sent the list of users, sending
1028 // PART messages for one of these users would be incorrect.
1029 // TODO: add support for draft/event-playback
1030 switch msg.Command {
1031 case "PRIVMSG", "NOTICE":
1032 return true
1033 }
1034 return false
1035}
1036
1037func (dc *downstreamConn) sendNetworkBacklog(net *network) {
1038 for _, entry := range net.delivered.innerMap {
1039 target := entry.originalKey
1040 dc.sendTargetBacklog(net, target)
1041 }
1042}
1043
1044func (dc *downstreamConn) sendTargetBacklog(net *network, target string) {
1045 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1046 return
1047 }
1048 if ch := net.channels.Value(target); ch != nil && ch.Detached {
1049 return
1050 }
1051 delivered := net.delivered.Value(target)
1052 if delivered == nil {
1053 return
1054 }
1055 lastDelivered, ok := delivered[dc.clientName]
1056 if !ok {
1057 return
1058 }
1059
1060 limit := 4000
1061 history, err := dc.user.msgStore.LoadLatestID(net, target, lastDelivered, limit)
1062 if err != nil {
1063 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
1064 return
1065 }
1066
1067 batchRef := "history"
1068 if dc.caps["batch"] {
1069 dc.SendMessage(&irc.Message{
1070 Prefix: dc.srv.prefix(),
1071 Command: "BATCH",
1072 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1073 })
1074 }
1075
1076 for _, msg := range history {
1077 if !dc.messageSupportsHistory(msg) {
1078 continue
1079 }
1080
1081 if dc.caps["batch"] {
1082 msg.Tags["batch"] = irc.TagValue(batchRef)
1083 }
1084 dc.SendMessage(dc.marshalMessage(msg, net))
1085 }
1086
1087 if dc.caps["batch"] {
1088 dc.SendMessage(&irc.Message{
1089 Prefix: dc.srv.prefix(),
1090 Command: "BATCH",
1091 Params: []string{"-" + batchRef},
1092 })
1093 }
1094}
1095
1096func (dc *downstreamConn) runUntilRegistered() error {
1097 for !dc.registered {
1098 msg, err := dc.ReadMessage()
1099 if err != nil {
1100 return fmt.Errorf("failed to read IRC command: %v", err)
1101 }
1102
1103 err = dc.handleMessage(msg)
1104 if ircErr, ok := err.(ircError); ok {
1105 ircErr.Message.Prefix = dc.srv.prefix()
1106 dc.SendMessage(ircErr.Message)
1107 } else if err != nil {
1108 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1109 }
1110 }
1111
1112 return nil
1113}
1114
1115func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1116 switch msg.Command {
1117 case "CAP":
1118 var subCmd string
1119 if err := parseMessageParams(msg, &subCmd); err != nil {
1120 return err
1121 }
1122 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1123 return err
1124 }
1125 case "PING":
1126 var source, destination string
1127 if err := parseMessageParams(msg, &source); err != nil {
1128 return err
1129 }
1130 if len(msg.Params) > 1 {
1131 destination = msg.Params[1]
1132 }
1133 if destination != "" && destination != dc.srv.Hostname {
1134 return ircError{&irc.Message{
1135 Command: irc.ERR_NOSUCHSERVER,
1136 Params: []string{dc.nick, destination, "No such server"},
1137 }}
1138 }
1139 dc.SendMessage(&irc.Message{
1140 Prefix: dc.srv.prefix(),
1141 Command: "PONG",
1142 Params: []string{dc.srv.Hostname, source},
1143 })
1144 return nil
1145 case "PONG":
1146 if len(msg.Params) == 0 {
1147 return newNeedMoreParamsError(msg.Command)
1148 }
1149 token := msg.Params[len(msg.Params)-1]
1150 dc.handlePong(token)
1151 case "USER":
1152 return ircError{&irc.Message{
1153 Command: irc.ERR_ALREADYREGISTERED,
1154 Params: []string{dc.nick, "You may not reregister"},
1155 }}
1156 case "NICK":
1157 var rawNick string
1158 if err := parseMessageParams(msg, &rawNick); err != nil {
1159 return err
1160 }
1161
1162 nick := rawNick
1163 var upstream *upstreamConn
1164 if dc.upstream() == nil {
1165 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1166 if err == nil { // NICK nick/network: NICK only on a specific upstream
1167 upstream = uc
1168 nick = unmarshaledNick
1169 }
1170 }
1171
1172 if strings.ContainsAny(nick, illegalNickChars) {
1173 return ircError{&irc.Message{
1174 Command: irc.ERR_ERRONEUSNICKNAME,
1175 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1176 }}
1177 }
1178 if casemapASCII(nick) == serviceNickCM {
1179 return ircError{&irc.Message{
1180 Command: irc.ERR_NICKNAMEINUSE,
1181 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1182 }}
1183 }
1184
1185 var err error
1186 dc.forEachNetwork(func(n *network) {
1187 if err != nil || (upstream != nil && upstream.network != n) {
1188 return
1189 }
1190 n.Nick = nick
1191 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1192 })
1193 if err != nil {
1194 return err
1195 }
1196
1197 dc.forEachUpstream(func(uc *upstreamConn) {
1198 if upstream != nil && upstream != uc {
1199 return
1200 }
1201 uc.SendMessageLabeled(dc.id, &irc.Message{
1202 Command: "NICK",
1203 Params: []string{nick},
1204 })
1205 })
1206
1207 if dc.upstream() == nil && dc.nick != nick {
1208 dc.SendMessage(&irc.Message{
1209 Prefix: dc.prefix(),
1210 Command: "NICK",
1211 Params: []string{nick},
1212 })
1213 dc.nick = nick
1214 dc.nickCM = casemapASCII(dc.nick)
1215 }
1216 case "JOIN":
1217 var namesStr string
1218 if err := parseMessageParams(msg, &namesStr); err != nil {
1219 return err
1220 }
1221
1222 var keys []string
1223 if len(msg.Params) > 1 {
1224 keys = strings.Split(msg.Params[1], ",")
1225 }
1226
1227 for i, name := range strings.Split(namesStr, ",") {
1228 uc, upstreamName, err := dc.unmarshalEntity(name)
1229 if err != nil {
1230 return err
1231 }
1232
1233 var key string
1234 if len(keys) > i {
1235 key = keys[i]
1236 }
1237
1238 params := []string{upstreamName}
1239 if key != "" {
1240 params = append(params, key)
1241 }
1242 uc.SendMessageLabeled(dc.id, &irc.Message{
1243 Command: "JOIN",
1244 Params: params,
1245 })
1246
1247 ch := uc.network.channels.Value(upstreamName)
1248 if ch != nil {
1249 // Don't clear the channel key if there's one set
1250 // TODO: add a way to unset the channel key
1251 if key != "" {
1252 ch.Key = key
1253 }
1254 uc.network.attach(ch)
1255 } else {
1256 ch = &Channel{
1257 Name: upstreamName,
1258 Key: key,
1259 }
1260 uc.network.channels.SetValue(upstreamName, ch)
1261 }
1262 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1263 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1264 }
1265 }
1266 case "PART":
1267 var namesStr string
1268 if err := parseMessageParams(msg, &namesStr); err != nil {
1269 return err
1270 }
1271
1272 var reason string
1273 if len(msg.Params) > 1 {
1274 reason = msg.Params[1]
1275 }
1276
1277 for _, name := range strings.Split(namesStr, ",") {
1278 uc, upstreamName, err := dc.unmarshalEntity(name)
1279 if err != nil {
1280 return err
1281 }
1282
1283 if strings.EqualFold(reason, "detach") {
1284 ch := uc.network.channels.Value(upstreamName)
1285 if ch != nil {
1286 uc.network.detach(ch)
1287 } else {
1288 ch = &Channel{
1289 Name: name,
1290 Detached: true,
1291 }
1292 uc.network.channels.SetValue(upstreamName, ch)
1293 }
1294 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1295 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1296 }
1297 } else {
1298 params := []string{upstreamName}
1299 if reason != "" {
1300 params = append(params, reason)
1301 }
1302 uc.SendMessageLabeled(dc.id, &irc.Message{
1303 Command: "PART",
1304 Params: params,
1305 })
1306
1307 if err := uc.network.deleteChannel(upstreamName); err != nil {
1308 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1309 }
1310 }
1311 }
1312 case "KICK":
1313 var channelStr, userStr string
1314 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1315 return err
1316 }
1317
1318 channels := strings.Split(channelStr, ",")
1319 users := strings.Split(userStr, ",")
1320
1321 var reason string
1322 if len(msg.Params) > 2 {
1323 reason = msg.Params[2]
1324 }
1325
1326 if len(channels) != 1 && len(channels) != len(users) {
1327 return ircError{&irc.Message{
1328 Command: irc.ERR_BADCHANMASK,
1329 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1330 }}
1331 }
1332
1333 for i, user := range users {
1334 var channel string
1335 if len(channels) == 1 {
1336 channel = channels[0]
1337 } else {
1338 channel = channels[i]
1339 }
1340
1341 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1342 if err != nil {
1343 return err
1344 }
1345
1346 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1347 if err != nil {
1348 return err
1349 }
1350
1351 if ucChannel != ucUser {
1352 return ircError{&irc.Message{
1353 Command: irc.ERR_USERNOTINCHANNEL,
1354 Params: []string{dc.nick, user, channel, "They are on another network"},
1355 }}
1356 }
1357 uc := ucChannel
1358
1359 params := []string{upstreamChannel, upstreamUser}
1360 if reason != "" {
1361 params = append(params, reason)
1362 }
1363 uc.SendMessageLabeled(dc.id, &irc.Message{
1364 Command: "KICK",
1365 Params: params,
1366 })
1367 }
1368 case "MODE":
1369 var name string
1370 if err := parseMessageParams(msg, &name); err != nil {
1371 return err
1372 }
1373
1374 var modeStr string
1375 if len(msg.Params) > 1 {
1376 modeStr = msg.Params[1]
1377 }
1378
1379 if casemapASCII(name) == dc.nickCM {
1380 if modeStr != "" {
1381 dc.forEachUpstream(func(uc *upstreamConn) {
1382 uc.SendMessageLabeled(dc.id, &irc.Message{
1383 Command: "MODE",
1384 Params: []string{uc.nick, modeStr},
1385 })
1386 })
1387 } else {
1388 dc.SendMessage(&irc.Message{
1389 Prefix: dc.srv.prefix(),
1390 Command: irc.RPL_UMODEIS,
1391 Params: []string{dc.nick, ""}, // TODO
1392 })
1393 }
1394 return nil
1395 }
1396
1397 uc, upstreamName, err := dc.unmarshalEntity(name)
1398 if err != nil {
1399 return err
1400 }
1401
1402 if !uc.isChannel(upstreamName) {
1403 return ircError{&irc.Message{
1404 Command: irc.ERR_USERSDONTMATCH,
1405 Params: []string{dc.nick, "Cannot change mode for other users"},
1406 }}
1407 }
1408
1409 if modeStr != "" {
1410 params := []string{upstreamName, modeStr}
1411 params = append(params, msg.Params[2:]...)
1412 uc.SendMessageLabeled(dc.id, &irc.Message{
1413 Command: "MODE",
1414 Params: params,
1415 })
1416 } else {
1417 ch := uc.channels.Value(upstreamName)
1418 if ch == nil {
1419 return ircError{&irc.Message{
1420 Command: irc.ERR_NOSUCHCHANNEL,
1421 Params: []string{dc.nick, name, "No such channel"},
1422 }}
1423 }
1424
1425 if ch.modes == nil {
1426 // we haven't received the initial RPL_CHANNELMODEIS yet
1427 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1428 return nil
1429 }
1430
1431 modeStr, modeParams := ch.modes.Format()
1432 params := []string{dc.nick, name, modeStr}
1433 params = append(params, modeParams...)
1434
1435 dc.SendMessage(&irc.Message{
1436 Prefix: dc.srv.prefix(),
1437 Command: irc.RPL_CHANNELMODEIS,
1438 Params: params,
1439 })
1440 if ch.creationTime != "" {
1441 dc.SendMessage(&irc.Message{
1442 Prefix: dc.srv.prefix(),
1443 Command: rpl_creationtime,
1444 Params: []string{dc.nick, name, ch.creationTime},
1445 })
1446 }
1447 }
1448 case "TOPIC":
1449 var channel string
1450 if err := parseMessageParams(msg, &channel); err != nil {
1451 return err
1452 }
1453
1454 uc, upstreamName, err := dc.unmarshalEntity(channel)
1455 if err != nil {
1456 return err
1457 }
1458
1459 if len(msg.Params) > 1 { // setting topic
1460 topic := msg.Params[1]
1461 uc.SendMessageLabeled(dc.id, &irc.Message{
1462 Command: "TOPIC",
1463 Params: []string{upstreamName, topic},
1464 })
1465 } else { // getting topic
1466 ch := uc.channels.Value(upstreamName)
1467 if ch == nil {
1468 return ircError{&irc.Message{
1469 Command: irc.ERR_NOSUCHCHANNEL,
1470 Params: []string{dc.nick, upstreamName, "No such channel"},
1471 }}
1472 }
1473 sendTopic(dc, ch)
1474 }
1475 case "LIST":
1476 // TODO: support ELIST when supported by all upstreams
1477
1478 pl := pendingLIST{
1479 downstreamID: dc.id,
1480 pendingCommands: make(map[int64]*irc.Message),
1481 }
1482 var upstream *upstreamConn
1483 var upstreamChannels map[int64][]string
1484 if len(msg.Params) > 0 {
1485 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1486 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1487 upstream = uc
1488 } else {
1489 upstreamChannels = make(map[int64][]string)
1490 channels := strings.Split(msg.Params[0], ",")
1491 for _, channel := range channels {
1492 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1493 if err != nil {
1494 return err
1495 }
1496 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1497 }
1498 }
1499 }
1500
1501 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1502 dc.forEachUpstream(func(uc *upstreamConn) {
1503 if upstream != nil && upstream != uc {
1504 return
1505 }
1506 var params []string
1507 if upstreamChannels != nil {
1508 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1509 params = []string{strings.Join(channels, ",")}
1510 } else {
1511 return
1512 }
1513 }
1514 pl.pendingCommands[uc.network.ID] = &irc.Message{
1515 Command: "LIST",
1516 Params: params,
1517 }
1518 uc.trySendLIST(dc.id)
1519 })
1520 case "NAMES":
1521 if len(msg.Params) == 0 {
1522 dc.SendMessage(&irc.Message{
1523 Prefix: dc.srv.prefix(),
1524 Command: irc.RPL_ENDOFNAMES,
1525 Params: []string{dc.nick, "*", "End of /NAMES list"},
1526 })
1527 return nil
1528 }
1529
1530 channels := strings.Split(msg.Params[0], ",")
1531 for _, channel := range channels {
1532 uc, upstreamName, err := dc.unmarshalEntity(channel)
1533 if err != nil {
1534 return err
1535 }
1536
1537 ch := uc.channels.Value(upstreamName)
1538 if ch != nil {
1539 sendNames(dc, ch)
1540 } else {
1541 // NAMES on a channel we have not joined, ask upstream
1542 uc.SendMessageLabeled(dc.id, &irc.Message{
1543 Command: "NAMES",
1544 Params: []string{upstreamName},
1545 })
1546 }
1547 }
1548 case "WHO":
1549 if len(msg.Params) == 0 {
1550 // TODO: support WHO without parameters
1551 dc.SendMessage(&irc.Message{
1552 Prefix: dc.srv.prefix(),
1553 Command: irc.RPL_ENDOFWHO,
1554 Params: []string{dc.nick, "*", "End of /WHO list"},
1555 })
1556 return nil
1557 }
1558
1559 // TODO: support WHO masks
1560 entity := msg.Params[0]
1561 entityCM := casemapASCII(entity)
1562
1563 if entityCM == dc.nickCM {
1564 // TODO: support AWAY (H/G) in self WHO reply
1565 dc.SendMessage(&irc.Message{
1566 Prefix: dc.srv.prefix(),
1567 Command: irc.RPL_WHOREPLY,
1568 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1569 })
1570 dc.SendMessage(&irc.Message{
1571 Prefix: dc.srv.prefix(),
1572 Command: irc.RPL_ENDOFWHO,
1573 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1574 })
1575 return nil
1576 }
1577 if entityCM == serviceNickCM {
1578 dc.SendMessage(&irc.Message{
1579 Prefix: dc.srv.prefix(),
1580 Command: irc.RPL_WHOREPLY,
1581 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1582 })
1583 dc.SendMessage(&irc.Message{
1584 Prefix: dc.srv.prefix(),
1585 Command: irc.RPL_ENDOFWHO,
1586 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1587 })
1588 return nil
1589 }
1590
1591 uc, upstreamName, err := dc.unmarshalEntity(entity)
1592 if err != nil {
1593 return err
1594 }
1595
1596 var params []string
1597 if len(msg.Params) == 2 {
1598 params = []string{upstreamName, msg.Params[1]}
1599 } else {
1600 params = []string{upstreamName}
1601 }
1602
1603 uc.SendMessageLabeled(dc.id, &irc.Message{
1604 Command: "WHO",
1605 Params: params,
1606 })
1607 case "WHOIS":
1608 if len(msg.Params) == 0 {
1609 return ircError{&irc.Message{
1610 Command: irc.ERR_NONICKNAMEGIVEN,
1611 Params: []string{dc.nick, "No nickname given"},
1612 }}
1613 }
1614
1615 var target, mask string
1616 if len(msg.Params) == 1 {
1617 target = ""
1618 mask = msg.Params[0]
1619 } else {
1620 target = msg.Params[0]
1621 mask = msg.Params[1]
1622 }
1623 // TODO: support multiple WHOIS users
1624 if i := strings.IndexByte(mask, ','); i >= 0 {
1625 mask = mask[:i]
1626 }
1627
1628 if casemapASCII(mask) == dc.nickCM {
1629 dc.SendMessage(&irc.Message{
1630 Prefix: dc.srv.prefix(),
1631 Command: irc.RPL_WHOISUSER,
1632 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1633 })
1634 dc.SendMessage(&irc.Message{
1635 Prefix: dc.srv.prefix(),
1636 Command: irc.RPL_WHOISSERVER,
1637 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1638 })
1639 dc.SendMessage(&irc.Message{
1640 Prefix: dc.srv.prefix(),
1641 Command: irc.RPL_ENDOFWHOIS,
1642 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1643 })
1644 return nil
1645 }
1646
1647 // TODO: support WHOIS masks
1648 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1649 if err != nil {
1650 return err
1651 }
1652
1653 var params []string
1654 if target != "" {
1655 if target == mask { // WHOIS nick nick
1656 params = []string{upstreamNick, upstreamNick}
1657 } else {
1658 params = []string{target, upstreamNick}
1659 }
1660 } else {
1661 params = []string{upstreamNick}
1662 }
1663
1664 uc.SendMessageLabeled(dc.id, &irc.Message{
1665 Command: "WHOIS",
1666 Params: params,
1667 })
1668 case "PRIVMSG":
1669 var targetsStr, text string
1670 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1671 return err
1672 }
1673 tags := copyClientTags(msg.Tags)
1674
1675 for _, name := range strings.Split(targetsStr, ",") {
1676 if name == serviceNick {
1677 if dc.caps["echo-message"] {
1678 echoTags := tags.Copy()
1679 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1680 dc.SendMessage(&irc.Message{
1681 Tags: echoTags,
1682 Prefix: dc.prefix(),
1683 Command: "PRIVMSG",
1684 Params: []string{name, text},
1685 })
1686 }
1687 handleServicePRIVMSG(dc, text)
1688 continue
1689 }
1690
1691 uc, upstreamName, err := dc.unmarshalEntity(name)
1692 if err != nil {
1693 return err
1694 }
1695
1696 if upstreamName == "NickServ" {
1697 dc.handleNickServPRIVMSG(uc, text)
1698 }
1699
1700 unmarshaledText := text
1701 if uc.isChannel(upstreamName) {
1702 unmarshaledText = dc.unmarshalText(uc, text)
1703 }
1704 uc.SendMessageLabeled(dc.id, &irc.Message{
1705 Tags: tags,
1706 Command: "PRIVMSG",
1707 Params: []string{upstreamName, unmarshaledText},
1708 })
1709
1710 echoTags := tags.Copy()
1711 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1712 echoMsg := &irc.Message{
1713 Tags: echoTags,
1714 Prefix: &irc.Prefix{
1715 Name: uc.nick,
1716 User: uc.username,
1717 },
1718 Command: "PRIVMSG",
1719 Params: []string{upstreamName, text},
1720 }
1721 uc.produce(upstreamName, echoMsg, dc)
1722
1723 uc.updateChannelAutoDetach(upstreamName)
1724 }
1725 case "NOTICE":
1726 var targetsStr, text string
1727 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1728 return err
1729 }
1730 tags := copyClientTags(msg.Tags)
1731
1732 for _, name := range strings.Split(targetsStr, ",") {
1733 uc, upstreamName, err := dc.unmarshalEntity(name)
1734 if err != nil {
1735 return err
1736 }
1737
1738 unmarshaledText := text
1739 if uc.isChannel(upstreamName) {
1740 unmarshaledText = dc.unmarshalText(uc, text)
1741 }
1742 uc.SendMessageLabeled(dc.id, &irc.Message{
1743 Tags: tags,
1744 Command: "NOTICE",
1745 Params: []string{upstreamName, unmarshaledText},
1746 })
1747
1748 uc.updateChannelAutoDetach(upstreamName)
1749 }
1750 case "TAGMSG":
1751 var targetsStr string
1752 if err := parseMessageParams(msg, &targetsStr); err != nil {
1753 return err
1754 }
1755 tags := copyClientTags(msg.Tags)
1756
1757 for _, name := range strings.Split(targetsStr, ",") {
1758 uc, upstreamName, err := dc.unmarshalEntity(name)
1759 if err != nil {
1760 return err
1761 }
1762 if _, ok := uc.caps["message-tags"]; !ok {
1763 continue
1764 }
1765
1766 uc.SendMessageLabeled(dc.id, &irc.Message{
1767 Tags: tags,
1768 Command: "TAGMSG",
1769 Params: []string{upstreamName},
1770 })
1771
1772 uc.updateChannelAutoDetach(upstreamName)
1773 }
1774 case "INVITE":
1775 var user, channel string
1776 if err := parseMessageParams(msg, &user, &channel); err != nil {
1777 return err
1778 }
1779
1780 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1781 if err != nil {
1782 return err
1783 }
1784
1785 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1786 if err != nil {
1787 return err
1788 }
1789
1790 if ucChannel != ucUser {
1791 return ircError{&irc.Message{
1792 Command: irc.ERR_USERNOTINCHANNEL,
1793 Params: []string{dc.nick, user, channel, "They are on another network"},
1794 }}
1795 }
1796 uc := ucChannel
1797
1798 uc.SendMessageLabeled(dc.id, &irc.Message{
1799 Command: "INVITE",
1800 Params: []string{upstreamUser, upstreamChannel},
1801 })
1802 case "CHATHISTORY":
1803 var subcommand string
1804 if err := parseMessageParams(msg, &subcommand); err != nil {
1805 return err
1806 }
1807 var target, criteria, limitStr string
1808 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1809 return ircError{&irc.Message{
1810 Command: "FAIL",
1811 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1812 }}
1813 }
1814
1815 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1816 if !ok {
1817 return ircError{&irc.Message{
1818 Command: irc.ERR_UNKNOWNCOMMAND,
1819 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
1820 }}
1821 }
1822
1823 uc, entity, err := dc.unmarshalEntity(target)
1824 if err != nil {
1825 return err
1826 }
1827 entity = uc.network.casemap(entity)
1828
1829 // TODO: support msgid criteria
1830 criteriaParts := strings.SplitN(criteria, "=", 2)
1831 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1832 return ircError{&irc.Message{
1833 Command: "FAIL",
1834 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, criteria, "Unknown criteria"},
1835 }}
1836 }
1837
1838 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1839 if err != nil {
1840 return ircError{&irc.Message{
1841 Command: "FAIL",
1842 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, criteria, "Invalid criteria"},
1843 }}
1844 }
1845
1846 limit, err := strconv.Atoi(limitStr)
1847 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1848 return ircError{&irc.Message{
1849 Command: "FAIL",
1850 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
1851 }}
1852 }
1853
1854 var history []*irc.Message
1855 switch subcommand {
1856 case "BEFORE":
1857 history, err = store.LoadBeforeTime(uc.network, entity, timestamp, limit)
1858 case "AFTER":
1859 history, err = store.LoadAfterTime(uc.network, entity, timestamp, limit)
1860 default:
1861 // TODO: support LATEST, BETWEEN
1862 return ircError{&irc.Message{
1863 Command: "FAIL",
1864 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1865 }}
1866 }
1867 if err != nil {
1868 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1869 return newChatHistoryError(subcommand, target)
1870 }
1871
1872 batchRef := "history"
1873 dc.SendMessage(&irc.Message{
1874 Prefix: dc.srv.prefix(),
1875 Command: "BATCH",
1876 Params: []string{"+" + batchRef, "chathistory", target},
1877 })
1878
1879 for _, msg := range history {
1880 msg.Tags["batch"] = irc.TagValue(batchRef)
1881 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1882 }
1883
1884 dc.SendMessage(&irc.Message{
1885 Prefix: dc.srv.prefix(),
1886 Command: "BATCH",
1887 Params: []string{"-" + batchRef},
1888 })
1889 default:
1890 dc.logger.Printf("unhandled message: %v", msg)
1891 return newUnknownCommandError(msg.Command)
1892 }
1893 return nil
1894}
1895
1896func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1897 username, password, ok := parseNickServCredentials(text, uc.nick)
1898 if !ok {
1899 return
1900 }
1901
1902 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1903 // automatically erase the key pair or any other credentials.
1904 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1905 return
1906 }
1907
1908 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1909 n := uc.network
1910 n.SASL.Mechanism = "PLAIN"
1911 n.SASL.Plain.Username = username
1912 n.SASL.Plain.Password = password
1913 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1914 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1915 }
1916}
1917
1918func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1919 fields := strings.Fields(text)
1920 if len(fields) < 2 {
1921 return "", "", false
1922 }
1923 cmd := strings.ToUpper(fields[0])
1924 params := fields[1:]
1925 switch cmd {
1926 case "REGISTER":
1927 username = nick
1928 password = params[0]
1929 case "IDENTIFY":
1930 if len(params) == 1 {
1931 username = nick
1932 password = params[0]
1933 } else {
1934 username = params[0]
1935 password = params[1]
1936 }
1937 case "SET":
1938 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1939 username = nick
1940 password = params[1]
1941 }
1942 default:
1943 return "", "", false
1944 }
1945 return username, password, true
1946}
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