source: code/trunk/downstream.go@ 520

Last change on this file since 520 was 520, checked in by contact, 4 years ago

Relay self-WHO/WHOIS in single-upstream mode

In multi-upstream mode, we can't relay WHO/WHOIS messages for the
current user, because we can't decide which upstream server the
message should be relayed to.

In single-upstream server, we do know which upstream server to use,
so we can just blindly relay the message.

This allows users to send a self-WHO/WHOIS to check their cloak and
other information.
File size: 48.2 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
61// '*' and '?' break masks
62const illegalNickChars = " :@!*?"
63
64// permanentDownstreamCaps is the list of always-supported downstream
65// capabilities.
66var permanentDownstreamCaps = map[string]string{
67 "batch": "",
68 "cap-notify": "",
69 "echo-message": "",
70 "invite-notify": "",
71 "message-tags": "",
72 "sasl": "PLAIN",
73 "server-time": "",
74}
75
76// needAllDownstreamCaps is the list of downstream capabilities that
77// require support from all upstreams to be enabled
78var needAllDownstreamCaps = map[string]string{
79 "away-notify": "",
80 "extended-join": "",
81 "multi-prefix": "",
82}
83
84// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
85// through from the upstream server to downstream clients.
86//
87// This is only effective in single-upstream mode.
88var passthroughIsupport = map[string]bool{
89 "AWAYLEN": true,
90 "CHANLIMIT": true,
91 "CHANMODES": true,
92 "CHANNELLEN": true,
93 "CHANTYPES": true,
94 "EXCEPTS": true,
95 "EXTBAN": true,
96 "HOSTLEN": true,
97 "INVEX": true,
98 "KICKLEN": true,
99 "MAXLIST": true,
100 "MAXTARGETS": true,
101 "MODES": true,
102 "NETWORK": true,
103 "NICKLEN": true,
104 "PREFIX": true,
105 "SAFELIST": true,
106 "TARGMAX": true,
107 "TOPICLEN": true,
108 "USERLEN": true,
109}
110
111type downstreamConn struct {
112 conn
113
114 id uint64
115
116 registered bool
117 user *user
118 nick string
119 nickCM string
120 rawUsername string
121 networkName string
122 clientName string
123 realname string
124 hostname string
125 password string // empty after authentication
126 network *network // can be nil
127
128 negociatingCaps bool
129 capVersion int
130 supportedCaps map[string]string
131 caps map[string]bool
132
133 saslServer sasl.Server
134}
135
136func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
137 remoteAddr := ic.RemoteAddr().String()
138 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
139 options := connOptions{Logger: logger}
140 dc := &downstreamConn{
141 conn: *newConn(srv, ic, &options),
142 id: id,
143 supportedCaps: make(map[string]string),
144 caps: make(map[string]bool),
145 }
146 dc.hostname = remoteAddr
147 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
148 dc.hostname = host
149 }
150 for k, v := range permanentDownstreamCaps {
151 dc.supportedCaps[k] = v
152 }
153 if srv.LogPath != "" {
154 dc.supportedCaps["draft/chathistory"] = ""
155 }
156 return dc
157}
158
159func (dc *downstreamConn) prefix() *irc.Prefix {
160 return &irc.Prefix{
161 Name: dc.nick,
162 User: dc.user.Username,
163 Host: dc.hostname,
164 }
165}
166
167func (dc *downstreamConn) forEachNetwork(f func(*network)) {
168 if dc.network != nil {
169 f(dc.network)
170 } else {
171 dc.user.forEachNetwork(f)
172 }
173}
174
175func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
176 dc.user.forEachUpstream(func(uc *upstreamConn) {
177 if dc.network != nil && uc.network != dc.network {
178 return
179 }
180 f(uc)
181 })
182}
183
184// upstream returns the upstream connection, if any. If there are zero or if
185// there are multiple upstream connections, it returns nil.
186func (dc *downstreamConn) upstream() *upstreamConn {
187 if dc.network == nil {
188 return nil
189 }
190 return dc.network.conn
191}
192
193func isOurNick(net *network, nick string) bool {
194 // TODO: this doesn't account for nick changes
195 if net.conn != nil {
196 return net.casemap(nick) == net.conn.nickCM
197 }
198 // We're not currently connected to the upstream connection, so we don't
199 // know whether this name is our nickname. Best-effort: use the network's
200 // configured nickname and hope it was the one being used when we were
201 // connected.
202 return net.casemap(nick) == net.casemap(net.Nick)
203}
204
205// marshalEntity converts an upstream entity name (ie. channel or nick) into a
206// downstream entity name.
207//
208// This involves adding a "/<network>" suffix if the entity isn't the current
209// user.
210func (dc *downstreamConn) marshalEntity(net *network, name string) string {
211 if isOurNick(net, name) {
212 return dc.nick
213 }
214 name = partialCasemap(net.casemap, name)
215 if dc.network != nil {
216 if dc.network != net {
217 panic("soju: tried to marshal an entity for another network")
218 }
219 return name
220 }
221 return name + "/" + net.GetName()
222}
223
224func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
225 if isOurNick(net, prefix.Name) {
226 return dc.prefix()
227 }
228 prefix.Name = partialCasemap(net.casemap, prefix.Name)
229 if dc.network != nil {
230 if dc.network != net {
231 panic("soju: tried to marshal a user prefix for another network")
232 }
233 return prefix
234 }
235 return &irc.Prefix{
236 Name: prefix.Name + "/" + net.GetName(),
237 User: prefix.User,
238 Host: prefix.Host,
239 }
240}
241
242// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
243// an upstream entity name.
244//
245// This involves removing the "/<network>" suffix.
246func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
247 if uc := dc.upstream(); uc != nil {
248 return uc, name, nil
249 }
250 if dc.network != nil {
251 return nil, "", ircError{&irc.Message{
252 Command: irc.ERR_NOSUCHCHANNEL,
253 Params: []string{name, "Disconnected from upstream network"},
254 }}
255 }
256
257 var conn *upstreamConn
258 if i := strings.LastIndexByte(name, '/'); i >= 0 {
259 network := name[i+1:]
260 name = name[:i]
261
262 dc.forEachUpstream(func(uc *upstreamConn) {
263 if network != uc.network.GetName() {
264 return
265 }
266 conn = uc
267 })
268 }
269
270 if conn == nil {
271 return nil, "", ircError{&irc.Message{
272 Command: irc.ERR_NOSUCHCHANNEL,
273 Params: []string{name, "Missing network suffix in channel name"},
274 }}
275 }
276 return conn, name, nil
277}
278
279func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
280 if dc.upstream() != nil {
281 return text
282 }
283 // TODO: smarter parsing that ignores URLs
284 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
285}
286
287func (dc *downstreamConn) readMessages(ch chan<- event) error {
288 for {
289 msg, err := dc.ReadMessage()
290 if err == io.EOF {
291 break
292 } else if err != nil {
293 return fmt.Errorf("failed to read IRC command: %v", err)
294 }
295
296 ch <- eventDownstreamMessage{msg, dc}
297 }
298
299 return nil
300}
301
302// SendMessage sends an outgoing message.
303//
304// This can only called from the user goroutine.
305func (dc *downstreamConn) SendMessage(msg *irc.Message) {
306 if !dc.caps["message-tags"] {
307 if msg.Command == "TAGMSG" {
308 return
309 }
310 msg = msg.Copy()
311 for name := range msg.Tags {
312 supported := false
313 switch name {
314 case "time":
315 supported = dc.caps["server-time"]
316 }
317 if !supported {
318 delete(msg.Tags, name)
319 }
320 }
321 }
322 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
323 msg.Params = msg.Params[:1]
324 }
325
326 dc.conn.SendMessage(msg)
327}
328
329// sendMessageWithID sends an outgoing message with the specified internal ID.
330func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
331 dc.SendMessage(msg)
332
333 if id == "" || !dc.messageSupportsHistory(msg) {
334 return
335 }
336
337 dc.sendPing(id)
338}
339
340// advanceMessageWithID advances history to the specified message ID without
341// sending a message. This is useful e.g. for self-messages when echo-message
342// isn't enabled.
343func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
344 if id == "" || !dc.messageSupportsHistory(msg) {
345 return
346 }
347
348 dc.sendPing(id)
349}
350
351// ackMsgID acknowledges that a message has been received.
352func (dc *downstreamConn) ackMsgID(id string) {
353 netID, entity, err := parseMsgID(id, nil)
354 if err != nil {
355 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
356 return
357 }
358
359 network := dc.user.getNetworkByID(netID)
360 if network == nil {
361 return
362 }
363
364 network.delivered.StoreID(entity, dc.clientName, id)
365}
366
367func (dc *downstreamConn) sendPing(msgID string) {
368 token := "soju-msgid-" + msgID
369 dc.SendMessage(&irc.Message{
370 Command: "PING",
371 Params: []string{token},
372 })
373}
374
375func (dc *downstreamConn) handlePong(token string) {
376 if !strings.HasPrefix(token, "soju-msgid-") {
377 dc.logger.Printf("received unrecognized PONG token %q", token)
378 return
379 }
380 msgID := strings.TrimPrefix(token, "soju-msgid-")
381 dc.ackMsgID(msgID)
382}
383
384// marshalMessage re-formats a message coming from an upstream connection so
385// that it's suitable for being sent on this downstream connection. Only
386// messages that may appear in logs are supported, except MODE.
387func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
388 msg = msg.Copy()
389 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
390
391 switch msg.Command {
392 case "PRIVMSG", "NOTICE", "TAGMSG":
393 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
394 case "NICK":
395 // Nick change for another user
396 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
397 case "JOIN", "PART":
398 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
399 case "KICK":
400 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
401 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
402 case "TOPIC":
403 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
404 case "QUIT":
405 // This space is intentionally left blank
406 default:
407 panic(fmt.Sprintf("unexpected %q message", msg.Command))
408 }
409
410 return msg
411}
412
413func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
414 switch msg.Command {
415 case "QUIT":
416 return dc.Close()
417 default:
418 if dc.registered {
419 return dc.handleMessageRegistered(msg)
420 } else {
421 return dc.handleMessageUnregistered(msg)
422 }
423 }
424}
425
426func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
427 switch msg.Command {
428 case "NICK":
429 var nick string
430 if err := parseMessageParams(msg, &nick); err != nil {
431 return err
432 }
433 if strings.ContainsAny(nick, illegalNickChars) {
434 return ircError{&irc.Message{
435 Command: irc.ERR_ERRONEUSNICKNAME,
436 Params: []string{dc.nick, nick, "contains illegal characters"},
437 }}
438 }
439 nickCM := casemapASCII(nick)
440 if nickCM == serviceNickCM {
441 return ircError{&irc.Message{
442 Command: irc.ERR_NICKNAMEINUSE,
443 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
444 }}
445 }
446 dc.nick = nick
447 dc.nickCM = nickCM
448 case "USER":
449 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
450 return err
451 }
452 case "PASS":
453 if err := parseMessageParams(msg, &dc.password); err != nil {
454 return err
455 }
456 case "CAP":
457 var subCmd string
458 if err := parseMessageParams(msg, &subCmd); err != nil {
459 return err
460 }
461 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
462 return err
463 }
464 case "AUTHENTICATE":
465 if !dc.caps["sasl"] {
466 return ircError{&irc.Message{
467 Command: irc.ERR_SASLFAIL,
468 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
469 }}
470 }
471 if len(msg.Params) == 0 {
472 return ircError{&irc.Message{
473 Command: irc.ERR_SASLFAIL,
474 Params: []string{"*", "Missing AUTHENTICATE argument"},
475 }}
476 }
477 if dc.nick == "" {
478 return ircError{&irc.Message{
479 Command: irc.ERR_SASLFAIL,
480 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
481 }}
482 }
483
484 var resp []byte
485 if dc.saslServer == nil {
486 mech := strings.ToUpper(msg.Params[0])
487 switch mech {
488 case "PLAIN":
489 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
490 return dc.authenticate(username, password)
491 }))
492 default:
493 return ircError{&irc.Message{
494 Command: irc.ERR_SASLFAIL,
495 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
496 }}
497 }
498 } else if msg.Params[0] == "*" {
499 dc.saslServer = nil
500 return ircError{&irc.Message{
501 Command: irc.ERR_SASLABORTED,
502 Params: []string{"*", "SASL authentication aborted"},
503 }}
504 } else if msg.Params[0] == "+" {
505 resp = nil
506 } else {
507 // TODO: multi-line messages
508 var err error
509 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
510 if err != nil {
511 dc.saslServer = nil
512 return ircError{&irc.Message{
513 Command: irc.ERR_SASLFAIL,
514 Params: []string{"*", "Invalid base64-encoded response"},
515 }}
516 }
517 }
518
519 challenge, done, err := dc.saslServer.Next(resp)
520 if err != nil {
521 dc.saslServer = nil
522 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
523 return ircError{&irc.Message{
524 Command: irc.ERR_SASLFAIL,
525 Params: []string{"*", ircErr.Message.Params[1]},
526 }}
527 }
528 dc.SendMessage(&irc.Message{
529 Prefix: dc.srv.prefix(),
530 Command: irc.ERR_SASLFAIL,
531 Params: []string{"*", "SASL error"},
532 })
533 return fmt.Errorf("SASL authentication failed: %v", err)
534 } else if done {
535 dc.saslServer = nil
536 dc.SendMessage(&irc.Message{
537 Prefix: dc.srv.prefix(),
538 Command: irc.RPL_LOGGEDIN,
539 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
540 })
541 dc.SendMessage(&irc.Message{
542 Prefix: dc.srv.prefix(),
543 Command: irc.RPL_SASLSUCCESS,
544 Params: []string{dc.nick, "SASL authentication successful"},
545 })
546 } else {
547 challengeStr := "+"
548 if len(challenge) > 0 {
549 challengeStr = base64.StdEncoding.EncodeToString(challenge)
550 }
551
552 // TODO: multi-line messages
553 dc.SendMessage(&irc.Message{
554 Prefix: dc.srv.prefix(),
555 Command: "AUTHENTICATE",
556 Params: []string{challengeStr},
557 })
558 }
559 default:
560 dc.logger.Printf("unhandled message: %v", msg)
561 return newUnknownCommandError(msg.Command)
562 }
563 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
564 return dc.register()
565 }
566 return nil
567}
568
569func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
570 cmd = strings.ToUpper(cmd)
571
572 replyTo := dc.nick
573 if !dc.registered {
574 replyTo = "*"
575 }
576
577 switch cmd {
578 case "LS":
579 if len(args) > 0 {
580 var err error
581 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
582 return err
583 }
584 }
585 if !dc.registered && dc.capVersion >= 302 {
586 // Let downstream show everything it supports, and trim
587 // down the available capabilities when upstreams are
588 // known.
589 for k, v := range needAllDownstreamCaps {
590 dc.supportedCaps[k] = v
591 }
592 }
593
594 caps := make([]string, 0, len(dc.supportedCaps))
595 for k, v := range dc.supportedCaps {
596 if dc.capVersion >= 302 && v != "" {
597 caps = append(caps, k+"="+v)
598 } else {
599 caps = append(caps, k)
600 }
601 }
602
603 // TODO: multi-line replies
604 dc.SendMessage(&irc.Message{
605 Prefix: dc.srv.prefix(),
606 Command: "CAP",
607 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
608 })
609
610 if dc.capVersion >= 302 {
611 // CAP version 302 implicitly enables cap-notify
612 dc.caps["cap-notify"] = true
613 }
614
615 if !dc.registered {
616 dc.negociatingCaps = true
617 }
618 case "LIST":
619 var caps []string
620 for name := range dc.caps {
621 caps = append(caps, name)
622 }
623
624 // TODO: multi-line replies
625 dc.SendMessage(&irc.Message{
626 Prefix: dc.srv.prefix(),
627 Command: "CAP",
628 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
629 })
630 case "REQ":
631 if len(args) == 0 {
632 return ircError{&irc.Message{
633 Command: err_invalidcapcmd,
634 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
635 }}
636 }
637
638 // TODO: atomically ack/nak the whole capability set
639 caps := strings.Fields(args[0])
640 ack := true
641 for _, name := range caps {
642 name = strings.ToLower(name)
643 enable := !strings.HasPrefix(name, "-")
644 if !enable {
645 name = strings.TrimPrefix(name, "-")
646 }
647
648 if enable == dc.caps[name] {
649 continue
650 }
651
652 _, ok := dc.supportedCaps[name]
653 if !ok {
654 ack = false
655 break
656 }
657
658 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
659 // cap-notify cannot be disabled with CAP version 302
660 ack = false
661 break
662 }
663
664 dc.caps[name] = enable
665 }
666
667 reply := "NAK"
668 if ack {
669 reply = "ACK"
670 }
671 dc.SendMessage(&irc.Message{
672 Prefix: dc.srv.prefix(),
673 Command: "CAP",
674 Params: []string{replyTo, reply, args[0]},
675 })
676 case "END":
677 dc.negociatingCaps = false
678 default:
679 return ircError{&irc.Message{
680 Command: err_invalidcapcmd,
681 Params: []string{replyTo, cmd, "Unknown CAP command"},
682 }}
683 }
684 return nil
685}
686
687func (dc *downstreamConn) setSupportedCap(name, value string) {
688 prevValue, hasPrev := dc.supportedCaps[name]
689 changed := !hasPrev || prevValue != value
690 dc.supportedCaps[name] = value
691
692 if !dc.caps["cap-notify"] || !changed {
693 return
694 }
695
696 replyTo := dc.nick
697 if !dc.registered {
698 replyTo = "*"
699 }
700
701 cap := name
702 if value != "" && dc.capVersion >= 302 {
703 cap = name + "=" + value
704 }
705
706 dc.SendMessage(&irc.Message{
707 Prefix: dc.srv.prefix(),
708 Command: "CAP",
709 Params: []string{replyTo, "NEW", cap},
710 })
711}
712
713func (dc *downstreamConn) unsetSupportedCap(name string) {
714 _, hasPrev := dc.supportedCaps[name]
715 delete(dc.supportedCaps, name)
716 delete(dc.caps, name)
717
718 if !dc.caps["cap-notify"] || !hasPrev {
719 return
720 }
721
722 replyTo := dc.nick
723 if !dc.registered {
724 replyTo = "*"
725 }
726
727 dc.SendMessage(&irc.Message{
728 Prefix: dc.srv.prefix(),
729 Command: "CAP",
730 Params: []string{replyTo, "DEL", name},
731 })
732}
733
734func (dc *downstreamConn) updateSupportedCaps() {
735 supportedCaps := make(map[string]bool)
736 for cap := range needAllDownstreamCaps {
737 supportedCaps[cap] = true
738 }
739 dc.forEachUpstream(func(uc *upstreamConn) {
740 for cap, supported := range supportedCaps {
741 supportedCaps[cap] = supported && uc.caps[cap]
742 }
743 })
744
745 for cap, supported := range supportedCaps {
746 if supported {
747 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
748 } else {
749 dc.unsetSupportedCap(cap)
750 }
751 }
752}
753
754func (dc *downstreamConn) updateNick() {
755 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
756 dc.SendMessage(&irc.Message{
757 Prefix: dc.prefix(),
758 Command: "NICK",
759 Params: []string{uc.nick},
760 })
761 dc.nick = uc.nick
762 dc.nickCM = casemapASCII(dc.nick)
763 }
764}
765
766func sanityCheckServer(addr string) error {
767 dialer := net.Dialer{Timeout: 30 * time.Second}
768 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
769 if err != nil {
770 return err
771 }
772 return conn.Close()
773}
774
775func unmarshalUsername(rawUsername string) (username, client, network string) {
776 username = rawUsername
777
778 i := strings.IndexAny(username, "/@")
779 j := strings.LastIndexAny(username, "/@")
780 if i >= 0 {
781 username = rawUsername[:i]
782 }
783 if j >= 0 {
784 if rawUsername[j] == '@' {
785 client = rawUsername[j+1:]
786 } else {
787 network = rawUsername[j+1:]
788 }
789 }
790 if i >= 0 && j >= 0 && i < j {
791 if rawUsername[i] == '@' {
792 client = rawUsername[i+1 : j]
793 } else {
794 network = rawUsername[i+1 : j]
795 }
796 }
797
798 return username, client, network
799}
800
801func (dc *downstreamConn) authenticate(username, password string) error {
802 username, clientName, networkName := unmarshalUsername(username)
803
804 u, err := dc.srv.db.GetUser(username)
805 if err != nil {
806 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
807 return errAuthFailed
808 }
809
810 // Password auth disabled
811 if u.Password == "" {
812 return errAuthFailed
813 }
814
815 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
816 if err != nil {
817 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
818 return errAuthFailed
819 }
820
821 dc.user = dc.srv.getUser(username)
822 if dc.user == nil {
823 dc.logger.Printf("failed authentication for %q: user not active", username)
824 return errAuthFailed
825 }
826 dc.clientName = clientName
827 dc.networkName = networkName
828 return nil
829}
830
831func (dc *downstreamConn) register() error {
832 if dc.registered {
833 return fmt.Errorf("tried to register twice")
834 }
835
836 password := dc.password
837 dc.password = ""
838 if dc.user == nil {
839 if err := dc.authenticate(dc.rawUsername, password); err != nil {
840 return err
841 }
842 }
843
844 if dc.clientName == "" && dc.networkName == "" {
845 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
846 }
847
848 dc.registered = true
849 dc.logger.Printf("registration complete for user %q", dc.user.Username)
850 return nil
851}
852
853func (dc *downstreamConn) loadNetwork() error {
854 if dc.networkName == "" {
855 return nil
856 }
857
858 network := dc.user.getNetwork(dc.networkName)
859 if network == nil {
860 addr := dc.networkName
861 if !strings.ContainsRune(addr, ':') {
862 addr = addr + ":6697"
863 }
864
865 dc.logger.Printf("trying to connect to new network %q", addr)
866 if err := sanityCheckServer(addr); err != nil {
867 dc.logger.Printf("failed to connect to %q: %v", addr, err)
868 return ircError{&irc.Message{
869 Command: irc.ERR_PASSWDMISMATCH,
870 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
871 }}
872 }
873
874 // Some clients only allow specifying the nickname (and use the
875 // nickname as a username too). Strip the network name from the
876 // nickname when auto-saving networks.
877 nick, _, _ := unmarshalUsername(dc.nick)
878
879 dc.logger.Printf("auto-saving network %q", dc.networkName)
880 var err error
881 network, err = dc.user.createNetwork(&Network{
882 Addr: dc.networkName,
883 Nick: nick,
884 })
885 if err != nil {
886 return err
887 }
888 }
889
890 dc.network = network
891 return nil
892}
893
894func (dc *downstreamConn) welcome() error {
895 if dc.user == nil || !dc.registered {
896 panic("tried to welcome an unregistered connection")
897 }
898
899 // TODO: doing this might take some time. We should do it in dc.register
900 // instead, but we'll potentially be adding a new network and this must be
901 // done in the user goroutine.
902 if err := dc.loadNetwork(); err != nil {
903 return err
904 }
905
906 isupport := []string{
907 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
908 "CASEMAPPING=ascii",
909 }
910
911 if uc := dc.upstream(); uc != nil {
912 for k := range passthroughIsupport {
913 v, ok := uc.isupport[k]
914 if !ok {
915 continue
916 }
917 if v != nil {
918 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
919 } else {
920 isupport = append(isupport, k)
921 }
922 }
923 }
924
925 dc.SendMessage(&irc.Message{
926 Prefix: dc.srv.prefix(),
927 Command: irc.RPL_WELCOME,
928 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
929 })
930 dc.SendMessage(&irc.Message{
931 Prefix: dc.srv.prefix(),
932 Command: irc.RPL_YOURHOST,
933 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
934 })
935 dc.SendMessage(&irc.Message{
936 Prefix: dc.srv.prefix(),
937 Command: irc.RPL_CREATED,
938 Params: []string{dc.nick, "Who cares when the server was created?"},
939 })
940 dc.SendMessage(&irc.Message{
941 Prefix: dc.srv.prefix(),
942 Command: irc.RPL_MYINFO,
943 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
944 })
945 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
946 dc.SendMessage(msg)
947 }
948 dc.SendMessage(&irc.Message{
949 Prefix: dc.srv.prefix(),
950 Command: irc.ERR_NOMOTD,
951 Params: []string{dc.nick, "No MOTD"},
952 })
953
954 dc.updateNick()
955 dc.updateSupportedCaps()
956
957 dc.forEachUpstream(func(uc *upstreamConn) {
958 for _, entry := range uc.channels.innerMap {
959 ch := entry.value.(*upstreamChannel)
960 if !ch.complete {
961 continue
962 }
963 record := uc.network.channels.Value(ch.Name)
964 if record != nil && record.Detached {
965 continue
966 }
967
968 dc.SendMessage(&irc.Message{
969 Prefix: dc.prefix(),
970 Command: "JOIN",
971 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
972 })
973
974 forwardChannel(dc, ch)
975 }
976 })
977
978 dc.forEachNetwork(func(net *network) {
979 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
980 return
981 }
982
983 // Only send history if we're the first connected client with that name
984 // for the network
985 firstClient := true
986 dc.user.forEachDownstream(func(c *downstreamConn) {
987 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
988 firstClient = false
989 }
990 })
991 if firstClient {
992 net.delivered.ForEachTarget(func(target string) {
993 lastDelivered := net.delivered.LoadID(target, dc.clientName)
994 if lastDelivered == "" {
995 return
996 }
997
998 dc.sendTargetBacklog(net, target, lastDelivered)
999
1000 // Fast-forward history to last message
1001 targetCM := net.casemap(target)
1002 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1003 if err != nil {
1004 dc.logger.Printf("failed to get last message ID: %v", err)
1005 return
1006 }
1007 net.delivered.StoreID(target, dc.clientName, lastID)
1008 })
1009 }
1010 })
1011
1012 return nil
1013}
1014
1015// messageSupportsHistory checks whether the provided message can be sent as
1016// part of an history batch.
1017func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1018 // Don't replay all messages, because that would mess up client
1019 // state. For instance we just sent the list of users, sending
1020 // PART messages for one of these users would be incorrect.
1021 // TODO: add support for draft/event-playback
1022 switch msg.Command {
1023 case "PRIVMSG", "NOTICE":
1024 return true
1025 }
1026 return false
1027}
1028
1029func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1030 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1031 return
1032 }
1033
1034 ch := net.channels.Value(target)
1035
1036 limit := 4000
1037 targetCM := net.casemap(target)
1038 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1039 if err != nil {
1040 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1041 return
1042 }
1043
1044 batchRef := "history"
1045 if dc.caps["batch"] {
1046 dc.SendMessage(&irc.Message{
1047 Prefix: dc.srv.prefix(),
1048 Command: "BATCH",
1049 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
1050 })
1051 }
1052
1053 for _, msg := range history {
1054 if !dc.messageSupportsHistory(msg) {
1055 continue
1056 }
1057
1058 if ch != nil && ch.Detached {
1059 if net.detachedMessageNeedsRelay(ch, msg) {
1060 dc.relayDetachedMessage(net, msg)
1061 }
1062 } else {
1063 if dc.caps["batch"] {
1064 msg.Tags["batch"] = irc.TagValue(batchRef)
1065 }
1066 dc.SendMessage(dc.marshalMessage(msg, net))
1067 }
1068 }
1069
1070 if dc.caps["batch"] {
1071 dc.SendMessage(&irc.Message{
1072 Prefix: dc.srv.prefix(),
1073 Command: "BATCH",
1074 Params: []string{"-" + batchRef},
1075 })
1076 }
1077}
1078
1079func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1080 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1081 return
1082 }
1083
1084 sender := msg.Prefix.Name
1085 target, text := msg.Params[0], msg.Params[1]
1086 if net.isHighlight(msg) {
1087 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1088 } else {
1089 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1090 }
1091}
1092
1093func (dc *downstreamConn) runUntilRegistered() error {
1094 for !dc.registered {
1095 msg, err := dc.ReadMessage()
1096 if err != nil {
1097 return fmt.Errorf("failed to read IRC command: %v", err)
1098 }
1099
1100 err = dc.handleMessage(msg)
1101 if ircErr, ok := err.(ircError); ok {
1102 ircErr.Message.Prefix = dc.srv.prefix()
1103 dc.SendMessage(ircErr.Message)
1104 } else if err != nil {
1105 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1106 }
1107 }
1108
1109 return nil
1110}
1111
1112func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1113 switch msg.Command {
1114 case "CAP":
1115 var subCmd string
1116 if err := parseMessageParams(msg, &subCmd); err != nil {
1117 return err
1118 }
1119 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1120 return err
1121 }
1122 case "PING":
1123 var source, destination string
1124 if err := parseMessageParams(msg, &source); err != nil {
1125 return err
1126 }
1127 if len(msg.Params) > 1 {
1128 destination = msg.Params[1]
1129 }
1130 if destination != "" && destination != dc.srv.Hostname {
1131 return ircError{&irc.Message{
1132 Command: irc.ERR_NOSUCHSERVER,
1133 Params: []string{dc.nick, destination, "No such server"},
1134 }}
1135 }
1136 dc.SendMessage(&irc.Message{
1137 Prefix: dc.srv.prefix(),
1138 Command: "PONG",
1139 Params: []string{dc.srv.Hostname, source},
1140 })
1141 return nil
1142 case "PONG":
1143 if len(msg.Params) == 0 {
1144 return newNeedMoreParamsError(msg.Command)
1145 }
1146 token := msg.Params[len(msg.Params)-1]
1147 dc.handlePong(token)
1148 case "USER":
1149 return ircError{&irc.Message{
1150 Command: irc.ERR_ALREADYREGISTERED,
1151 Params: []string{dc.nick, "You may not reregister"},
1152 }}
1153 case "NICK":
1154 var rawNick string
1155 if err := parseMessageParams(msg, &rawNick); err != nil {
1156 return err
1157 }
1158
1159 nick := rawNick
1160 var upstream *upstreamConn
1161 if dc.upstream() == nil {
1162 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1163 if err == nil { // NICK nick/network: NICK only on a specific upstream
1164 upstream = uc
1165 nick = unmarshaledNick
1166 }
1167 }
1168
1169 if strings.ContainsAny(nick, illegalNickChars) {
1170 return ircError{&irc.Message{
1171 Command: irc.ERR_ERRONEUSNICKNAME,
1172 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1173 }}
1174 }
1175 if casemapASCII(nick) == serviceNickCM {
1176 return ircError{&irc.Message{
1177 Command: irc.ERR_NICKNAMEINUSE,
1178 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1179 }}
1180 }
1181
1182 var err error
1183 dc.forEachNetwork(func(n *network) {
1184 if err != nil || (upstream != nil && upstream.network != n) {
1185 return
1186 }
1187 n.Nick = nick
1188 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1189 })
1190 if err != nil {
1191 return err
1192 }
1193
1194 dc.forEachUpstream(func(uc *upstreamConn) {
1195 if upstream != nil && upstream != uc {
1196 return
1197 }
1198 uc.SendMessageLabeled(dc.id, &irc.Message{
1199 Command: "NICK",
1200 Params: []string{nick},
1201 })
1202 })
1203
1204 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1205 dc.SendMessage(&irc.Message{
1206 Prefix: dc.prefix(),
1207 Command: "NICK",
1208 Params: []string{nick},
1209 })
1210 dc.nick = nick
1211 dc.nickCM = casemapASCII(dc.nick)
1212 }
1213 case "JOIN":
1214 var namesStr string
1215 if err := parseMessageParams(msg, &namesStr); err != nil {
1216 return err
1217 }
1218
1219 var keys []string
1220 if len(msg.Params) > 1 {
1221 keys = strings.Split(msg.Params[1], ",")
1222 }
1223
1224 for i, name := range strings.Split(namesStr, ",") {
1225 uc, upstreamName, err := dc.unmarshalEntity(name)
1226 if err != nil {
1227 return err
1228 }
1229
1230 var key string
1231 if len(keys) > i {
1232 key = keys[i]
1233 }
1234
1235 params := []string{upstreamName}
1236 if key != "" {
1237 params = append(params, key)
1238 }
1239 uc.SendMessageLabeled(dc.id, &irc.Message{
1240 Command: "JOIN",
1241 Params: params,
1242 })
1243
1244 ch := uc.network.channels.Value(upstreamName)
1245 if ch != nil {
1246 // Don't clear the channel key if there's one set
1247 // TODO: add a way to unset the channel key
1248 if key != "" {
1249 ch.Key = key
1250 }
1251 uc.network.attach(ch)
1252 } else {
1253 ch = &Channel{
1254 Name: upstreamName,
1255 Key: key,
1256 }
1257 uc.network.channels.SetValue(upstreamName, ch)
1258 }
1259 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1260 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1261 }
1262 }
1263 case "PART":
1264 var namesStr string
1265 if err := parseMessageParams(msg, &namesStr); err != nil {
1266 return err
1267 }
1268
1269 var reason string
1270 if len(msg.Params) > 1 {
1271 reason = msg.Params[1]
1272 }
1273
1274 for _, name := range strings.Split(namesStr, ",") {
1275 uc, upstreamName, err := dc.unmarshalEntity(name)
1276 if err != nil {
1277 return err
1278 }
1279
1280 if strings.EqualFold(reason, "detach") {
1281 ch := uc.network.channels.Value(upstreamName)
1282 if ch != nil {
1283 uc.network.detach(ch)
1284 } else {
1285 ch = &Channel{
1286 Name: name,
1287 Detached: true,
1288 }
1289 uc.network.channels.SetValue(upstreamName, ch)
1290 }
1291 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1292 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1293 }
1294 } else {
1295 params := []string{upstreamName}
1296 if reason != "" {
1297 params = append(params, reason)
1298 }
1299 uc.SendMessageLabeled(dc.id, &irc.Message{
1300 Command: "PART",
1301 Params: params,
1302 })
1303
1304 if err := uc.network.deleteChannel(upstreamName); err != nil {
1305 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1306 }
1307 }
1308 }
1309 case "KICK":
1310 var channelStr, userStr string
1311 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1312 return err
1313 }
1314
1315 channels := strings.Split(channelStr, ",")
1316 users := strings.Split(userStr, ",")
1317
1318 var reason string
1319 if len(msg.Params) > 2 {
1320 reason = msg.Params[2]
1321 }
1322
1323 if len(channels) != 1 && len(channels) != len(users) {
1324 return ircError{&irc.Message{
1325 Command: irc.ERR_BADCHANMASK,
1326 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1327 }}
1328 }
1329
1330 for i, user := range users {
1331 var channel string
1332 if len(channels) == 1 {
1333 channel = channels[0]
1334 } else {
1335 channel = channels[i]
1336 }
1337
1338 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1339 if err != nil {
1340 return err
1341 }
1342
1343 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1344 if err != nil {
1345 return err
1346 }
1347
1348 if ucChannel != ucUser {
1349 return ircError{&irc.Message{
1350 Command: irc.ERR_USERNOTINCHANNEL,
1351 Params: []string{dc.nick, user, channel, "They are on another network"},
1352 }}
1353 }
1354 uc := ucChannel
1355
1356 params := []string{upstreamChannel, upstreamUser}
1357 if reason != "" {
1358 params = append(params, reason)
1359 }
1360 uc.SendMessageLabeled(dc.id, &irc.Message{
1361 Command: "KICK",
1362 Params: params,
1363 })
1364 }
1365 case "MODE":
1366 var name string
1367 if err := parseMessageParams(msg, &name); err != nil {
1368 return err
1369 }
1370
1371 var modeStr string
1372 if len(msg.Params) > 1 {
1373 modeStr = msg.Params[1]
1374 }
1375
1376 if casemapASCII(name) == dc.nickCM {
1377 if modeStr != "" {
1378 dc.forEachUpstream(func(uc *upstreamConn) {
1379 uc.SendMessageLabeled(dc.id, &irc.Message{
1380 Command: "MODE",
1381 Params: []string{uc.nick, modeStr},
1382 })
1383 })
1384 } else {
1385 // TODO: only do this in multi-upstream mode
1386 dc.SendMessage(&irc.Message{
1387 Prefix: dc.srv.prefix(),
1388 Command: irc.RPL_UMODEIS,
1389 Params: []string{dc.nick, ""}, // TODO
1390 })
1391 }
1392 return nil
1393 }
1394
1395 uc, upstreamName, err := dc.unmarshalEntity(name)
1396 if err != nil {
1397 return err
1398 }
1399
1400 if !uc.isChannel(upstreamName) {
1401 return ircError{&irc.Message{
1402 Command: irc.ERR_USERSDONTMATCH,
1403 Params: []string{dc.nick, "Cannot change mode for other users"},
1404 }}
1405 }
1406
1407 if modeStr != "" {
1408 params := []string{upstreamName, modeStr}
1409 params = append(params, msg.Params[2:]...)
1410 uc.SendMessageLabeled(dc.id, &irc.Message{
1411 Command: "MODE",
1412 Params: params,
1413 })
1414 } else {
1415 ch := uc.channels.Value(upstreamName)
1416 if ch == nil {
1417 return ircError{&irc.Message{
1418 Command: irc.ERR_NOSUCHCHANNEL,
1419 Params: []string{dc.nick, name, "No such channel"},
1420 }}
1421 }
1422
1423 if ch.modes == nil {
1424 // we haven't received the initial RPL_CHANNELMODEIS yet
1425 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1426 return nil
1427 }
1428
1429 modeStr, modeParams := ch.modes.Format()
1430 params := []string{dc.nick, name, modeStr}
1431 params = append(params, modeParams...)
1432
1433 dc.SendMessage(&irc.Message{
1434 Prefix: dc.srv.prefix(),
1435 Command: irc.RPL_CHANNELMODEIS,
1436 Params: params,
1437 })
1438 if ch.creationTime != "" {
1439 dc.SendMessage(&irc.Message{
1440 Prefix: dc.srv.prefix(),
1441 Command: rpl_creationtime,
1442 Params: []string{dc.nick, name, ch.creationTime},
1443 })
1444 }
1445 }
1446 case "TOPIC":
1447 var channel string
1448 if err := parseMessageParams(msg, &channel); err != nil {
1449 return err
1450 }
1451
1452 uc, upstreamName, err := dc.unmarshalEntity(channel)
1453 if err != nil {
1454 return err
1455 }
1456
1457 if len(msg.Params) > 1 { // setting topic
1458 topic := msg.Params[1]
1459 uc.SendMessageLabeled(dc.id, &irc.Message{
1460 Command: "TOPIC",
1461 Params: []string{upstreamName, topic},
1462 })
1463 } else { // getting topic
1464 ch := uc.channels.Value(upstreamName)
1465 if ch == nil {
1466 return ircError{&irc.Message{
1467 Command: irc.ERR_NOSUCHCHANNEL,
1468 Params: []string{dc.nick, upstreamName, "No such channel"},
1469 }}
1470 }
1471 sendTopic(dc, ch)
1472 }
1473 case "LIST":
1474 // TODO: support ELIST when supported by all upstreams
1475
1476 pl := pendingLIST{
1477 downstreamID: dc.id,
1478 pendingCommands: make(map[int64]*irc.Message),
1479 }
1480 var upstream *upstreamConn
1481 var upstreamChannels map[int64][]string
1482 if len(msg.Params) > 0 {
1483 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1484 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1485 upstream = uc
1486 } else {
1487 upstreamChannels = make(map[int64][]string)
1488 channels := strings.Split(msg.Params[0], ",")
1489 for _, channel := range channels {
1490 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1491 if err != nil {
1492 return err
1493 }
1494 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1495 }
1496 }
1497 }
1498
1499 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1500 dc.forEachUpstream(func(uc *upstreamConn) {
1501 if upstream != nil && upstream != uc {
1502 return
1503 }
1504 var params []string
1505 if upstreamChannels != nil {
1506 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1507 params = []string{strings.Join(channels, ",")}
1508 } else {
1509 return
1510 }
1511 }
1512 pl.pendingCommands[uc.network.ID] = &irc.Message{
1513 Command: "LIST",
1514 Params: params,
1515 }
1516 uc.trySendLIST(dc.id)
1517 })
1518 case "NAMES":
1519 if len(msg.Params) == 0 {
1520 dc.SendMessage(&irc.Message{
1521 Prefix: dc.srv.prefix(),
1522 Command: irc.RPL_ENDOFNAMES,
1523 Params: []string{dc.nick, "*", "End of /NAMES list"},
1524 })
1525 return nil
1526 }
1527
1528 channels := strings.Split(msg.Params[0], ",")
1529 for _, channel := range channels {
1530 uc, upstreamName, err := dc.unmarshalEntity(channel)
1531 if err != nil {
1532 return err
1533 }
1534
1535 ch := uc.channels.Value(upstreamName)
1536 if ch != nil {
1537 sendNames(dc, ch)
1538 } else {
1539 // NAMES on a channel we have not joined, ask upstream
1540 uc.SendMessageLabeled(dc.id, &irc.Message{
1541 Command: "NAMES",
1542 Params: []string{upstreamName},
1543 })
1544 }
1545 }
1546 case "WHO":
1547 if len(msg.Params) == 0 {
1548 // TODO: support WHO without parameters
1549 dc.SendMessage(&irc.Message{
1550 Prefix: dc.srv.prefix(),
1551 Command: irc.RPL_ENDOFWHO,
1552 Params: []string{dc.nick, "*", "End of /WHO list"},
1553 })
1554 return nil
1555 }
1556
1557 // TODO: support WHO masks
1558 entity := msg.Params[0]
1559 entityCM := casemapASCII(entity)
1560
1561 if dc.network == nil && entityCM == dc.nickCM {
1562 // TODO: support AWAY (H/G) in self WHO reply
1563 dc.SendMessage(&irc.Message{
1564 Prefix: dc.srv.prefix(),
1565 Command: irc.RPL_WHOREPLY,
1566 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1567 })
1568 dc.SendMessage(&irc.Message{
1569 Prefix: dc.srv.prefix(),
1570 Command: irc.RPL_ENDOFWHO,
1571 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1572 })
1573 return nil
1574 }
1575 if entityCM == serviceNickCM {
1576 dc.SendMessage(&irc.Message{
1577 Prefix: dc.srv.prefix(),
1578 Command: irc.RPL_WHOREPLY,
1579 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1580 })
1581 dc.SendMessage(&irc.Message{
1582 Prefix: dc.srv.prefix(),
1583 Command: irc.RPL_ENDOFWHO,
1584 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1585 })
1586 return nil
1587 }
1588
1589 uc, upstreamName, err := dc.unmarshalEntity(entity)
1590 if err != nil {
1591 return err
1592 }
1593
1594 var params []string
1595 if len(msg.Params) == 2 {
1596 params = []string{upstreamName, msg.Params[1]}
1597 } else {
1598 params = []string{upstreamName}
1599 }
1600
1601 uc.SendMessageLabeled(dc.id, &irc.Message{
1602 Command: "WHO",
1603 Params: params,
1604 })
1605 case "WHOIS":
1606 if len(msg.Params) == 0 {
1607 return ircError{&irc.Message{
1608 Command: irc.ERR_NONICKNAMEGIVEN,
1609 Params: []string{dc.nick, "No nickname given"},
1610 }}
1611 }
1612
1613 var target, mask string
1614 if len(msg.Params) == 1 {
1615 target = ""
1616 mask = msg.Params[0]
1617 } else {
1618 target = msg.Params[0]
1619 mask = msg.Params[1]
1620 }
1621 // TODO: support multiple WHOIS users
1622 if i := strings.IndexByte(mask, ','); i >= 0 {
1623 mask = mask[:i]
1624 }
1625
1626 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
1627 dc.SendMessage(&irc.Message{
1628 Prefix: dc.srv.prefix(),
1629 Command: irc.RPL_WHOISUSER,
1630 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1631 })
1632 dc.SendMessage(&irc.Message{
1633 Prefix: dc.srv.prefix(),
1634 Command: irc.RPL_WHOISSERVER,
1635 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1636 })
1637 dc.SendMessage(&irc.Message{
1638 Prefix: dc.srv.prefix(),
1639 Command: irc.RPL_ENDOFWHOIS,
1640 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1641 })
1642 return nil
1643 }
1644
1645 // TODO: support WHOIS masks
1646 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1647 if err != nil {
1648 return err
1649 }
1650
1651 var params []string
1652 if target != "" {
1653 if target == mask { // WHOIS nick nick
1654 params = []string{upstreamNick, upstreamNick}
1655 } else {
1656 params = []string{target, upstreamNick}
1657 }
1658 } else {
1659 params = []string{upstreamNick}
1660 }
1661
1662 uc.SendMessageLabeled(dc.id, &irc.Message{
1663 Command: "WHOIS",
1664 Params: params,
1665 })
1666 case "PRIVMSG":
1667 var targetsStr, text string
1668 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1669 return err
1670 }
1671 tags := copyClientTags(msg.Tags)
1672
1673 for _, name := range strings.Split(targetsStr, ",") {
1674 if casemapASCII(name) == serviceNickCM {
1675 if dc.caps["echo-message"] {
1676 echoTags := tags.Copy()
1677 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1678 dc.SendMessage(&irc.Message{
1679 Tags: echoTags,
1680 Prefix: dc.prefix(),
1681 Command: "PRIVMSG",
1682 Params: []string{name, text},
1683 })
1684 }
1685 handleServicePRIVMSG(dc, text)
1686 continue
1687 }
1688
1689 uc, upstreamName, err := dc.unmarshalEntity(name)
1690 if err != nil {
1691 return err
1692 }
1693
1694 if uc.network.casemap(upstreamName) == "nickserv" {
1695 dc.handleNickServPRIVMSG(uc, text)
1696 }
1697
1698 unmarshaledText := text
1699 if uc.isChannel(upstreamName) {
1700 unmarshaledText = dc.unmarshalText(uc, text)
1701 }
1702 uc.SendMessageLabeled(dc.id, &irc.Message{
1703 Tags: tags,
1704 Command: "PRIVMSG",
1705 Params: []string{upstreamName, unmarshaledText},
1706 })
1707
1708 echoTags := tags.Copy()
1709 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1710 echoMsg := &irc.Message{
1711 Tags: echoTags,
1712 Prefix: &irc.Prefix{
1713 Name: uc.nick,
1714 User: uc.username,
1715 },
1716 Command: "PRIVMSG",
1717 Params: []string{upstreamName, text},
1718 }
1719 uc.produce(upstreamName, echoMsg, dc)
1720
1721 uc.updateChannelAutoDetach(upstreamName)
1722 }
1723 case "NOTICE":
1724 var targetsStr, text string
1725 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1726 return err
1727 }
1728 tags := copyClientTags(msg.Tags)
1729
1730 for _, name := range strings.Split(targetsStr, ",") {
1731 uc, upstreamName, err := dc.unmarshalEntity(name)
1732 if err != nil {
1733 return err
1734 }
1735
1736 unmarshaledText := text
1737 if uc.isChannel(upstreamName) {
1738 unmarshaledText = dc.unmarshalText(uc, text)
1739 }
1740 uc.SendMessageLabeled(dc.id, &irc.Message{
1741 Tags: tags,
1742 Command: "NOTICE",
1743 Params: []string{upstreamName, unmarshaledText},
1744 })
1745
1746 uc.updateChannelAutoDetach(upstreamName)
1747 }
1748 case "TAGMSG":
1749 var targetsStr string
1750 if err := parseMessageParams(msg, &targetsStr); err != nil {
1751 return err
1752 }
1753 tags := copyClientTags(msg.Tags)
1754
1755 for _, name := range strings.Split(targetsStr, ",") {
1756 uc, upstreamName, err := dc.unmarshalEntity(name)
1757 if err != nil {
1758 return err
1759 }
1760 if _, ok := uc.caps["message-tags"]; !ok {
1761 continue
1762 }
1763
1764 uc.SendMessageLabeled(dc.id, &irc.Message{
1765 Tags: tags,
1766 Command: "TAGMSG",
1767 Params: []string{upstreamName},
1768 })
1769
1770 uc.updateChannelAutoDetach(upstreamName)
1771 }
1772 case "INVITE":
1773 var user, channel string
1774 if err := parseMessageParams(msg, &user, &channel); err != nil {
1775 return err
1776 }
1777
1778 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1779 if err != nil {
1780 return err
1781 }
1782
1783 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1784 if err != nil {
1785 return err
1786 }
1787
1788 if ucChannel != ucUser {
1789 return ircError{&irc.Message{
1790 Command: irc.ERR_USERNOTINCHANNEL,
1791 Params: []string{dc.nick, user, channel, "They are on another network"},
1792 }}
1793 }
1794 uc := ucChannel
1795
1796 uc.SendMessageLabeled(dc.id, &irc.Message{
1797 Command: "INVITE",
1798 Params: []string{upstreamUser, upstreamChannel},
1799 })
1800 case "CHATHISTORY":
1801 var subcommand string
1802 if err := parseMessageParams(msg, &subcommand); err != nil {
1803 return err
1804 }
1805 var target, limitStr string
1806 var boundsStr [2]string
1807 switch subcommand {
1808 case "AFTER", "BEFORE":
1809 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
1810 return err
1811 }
1812 case "BETWEEN":
1813 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
1814 return err
1815 }
1816 default:
1817 // TODO: support LATEST, AROUND
1818 return ircError{&irc.Message{
1819 Command: "FAIL",
1820 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
1821 }}
1822 }
1823
1824 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1825 if !ok {
1826 return ircError{&irc.Message{
1827 Command: irc.ERR_UNKNOWNCOMMAND,
1828 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
1829 }}
1830 }
1831
1832 uc, entity, err := dc.unmarshalEntity(target)
1833 if err != nil {
1834 return err
1835 }
1836 entity = uc.network.casemap(entity)
1837
1838 // TODO: support msgid criteria
1839 var bounds [2]time.Time
1840 bounds[0] = parseChatHistoryBound(boundsStr[0])
1841 if bounds[0].IsZero() {
1842 return ircError{&irc.Message{
1843 Command: "FAIL",
1844 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
1845 }}
1846 }
1847
1848 if boundsStr[1] != "" {
1849 bounds[1] = parseChatHistoryBound(boundsStr[1])
1850 if bounds[1].IsZero() {
1851 return ircError{&irc.Message{
1852 Command: "FAIL",
1853 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
1854 }}
1855 }
1856 }
1857
1858 limit, err := strconv.Atoi(limitStr)
1859 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1860 return ircError{&irc.Message{
1861 Command: "FAIL",
1862 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
1863 }}
1864 }
1865
1866 var history []*irc.Message
1867 switch subcommand {
1868 case "BEFORE":
1869 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], time.Time{}, limit)
1870 case "AFTER":
1871 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], time.Now(), limit)
1872 case "BETWEEN":
1873 if bounds[0].Before(bounds[1]) {
1874 history, err = store.LoadAfterTime(uc.network, entity, bounds[0], bounds[1], limit)
1875 } else {
1876 history, err = store.LoadBeforeTime(uc.network, entity, bounds[0], bounds[1], limit)
1877 }
1878 }
1879 if err != nil {
1880 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
1881 return newChatHistoryError(subcommand, target)
1882 }
1883
1884 batchRef := "history"
1885 dc.SendMessage(&irc.Message{
1886 Prefix: dc.srv.prefix(),
1887 Command: "BATCH",
1888 Params: []string{"+" + batchRef, "chathistory", target},
1889 })
1890
1891 for _, msg := range history {
1892 msg.Tags["batch"] = irc.TagValue(batchRef)
1893 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1894 }
1895
1896 dc.SendMessage(&irc.Message{
1897 Prefix: dc.srv.prefix(),
1898 Command: "BATCH",
1899 Params: []string{"-" + batchRef},
1900 })
1901 default:
1902 dc.logger.Printf("unhandled message: %v", msg)
1903 return newUnknownCommandError(msg.Command)
1904 }
1905 return nil
1906}
1907
1908func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1909 username, password, ok := parseNickServCredentials(text, uc.nick)
1910 if !ok {
1911 return
1912 }
1913
1914 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1915 // automatically erase the key pair or any other credentials.
1916 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1917 return
1918 }
1919
1920 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1921 n := uc.network
1922 n.SASL.Mechanism = "PLAIN"
1923 n.SASL.Plain.Username = username
1924 n.SASL.Plain.Password = password
1925 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1926 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1927 }
1928}
1929
1930func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1931 fields := strings.Fields(text)
1932 if len(fields) < 2 {
1933 return "", "", false
1934 }
1935 cmd := strings.ToUpper(fields[0])
1936 params := fields[1:]
1937 switch cmd {
1938 case "REGISTER":
1939 username = nick
1940 password = params[0]
1941 case "IDENTIFY":
1942 if len(params) == 1 {
1943 username = nick
1944 password = params[0]
1945 } else {
1946 username = params[0]
1947 password = params[1]
1948 }
1949 case "SET":
1950 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1951 username = nick
1952 password = params[1]
1953 }
1954 default:
1955 return "", "", false
1956 }
1957 return username, password, true
1958}
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