source: code/trunk/downstream.go@ 661

Last change on this file since 661 was 661, checked in by contact, 4 years ago

Mark bouncer users and BouncerServ as authenticated in WHOX/WHOIS
File size: 64.5 KB
Line 
1package soju
2
3import (
4 "context"
5 "crypto/tls"
6 "encoding/base64"
7 "errors"
8 "fmt"
9 "io"
10 "net"
11 "strconv"
12 "strings"
13 "time"
14
15 "github.com/emersion/go-sasl"
16 "golang.org/x/crypto/bcrypt"
17 "gopkg.in/irc.v3"
18)
19
20type ircError struct {
21 Message *irc.Message
22}
23
24func (err ircError) Error() string {
25 return err.Message.String()
26}
27
28func newUnknownCommandError(cmd string) ircError {
29 return ircError{&irc.Message{
30 Command: irc.ERR_UNKNOWNCOMMAND,
31 Params: []string{
32 "*",
33 cmd,
34 "Unknown command",
35 },
36 }}
37}
38
39func newNeedMoreParamsError(cmd string) ircError {
40 return ircError{&irc.Message{
41 Command: irc.ERR_NEEDMOREPARAMS,
42 Params: []string{
43 "*",
44 cmd,
45 "Not enough parameters",
46 },
47 }}
48}
49
50func newChatHistoryError(subcommand string, target string) ircError {
51 return ircError{&irc.Message{
52 Command: "FAIL",
53 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
54 }}
55}
56
57var errAuthFailed = ircError{&irc.Message{
58 Command: irc.ERR_PASSWDMISMATCH,
59 Params: []string{"*", "Invalid username or password"},
60}}
61
62func parseBouncerNetID(subcommand, s string) (int64, error) {
63 id, err := strconv.ParseInt(s, 10, 64)
64 if err != nil {
65 return 0, ircError{&irc.Message{
66 Command: "FAIL",
67 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
68 }}
69 }
70 return id, nil
71}
72
73func fillNetworkAddrAttrs(attrs irc.Tags, network *Network) {
74 u, err := network.URL()
75 if err != nil {
76 return
77 }
78
79 hasHostPort := true
80 switch u.Scheme {
81 case "ircs":
82 attrs["tls"] = irc.TagValue("1")
83 case "irc+insecure":
84 attrs["tls"] = irc.TagValue("0")
85 default: // e.g. unix://
86 hasHostPort = false
87 }
88 if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
89 attrs["host"] = irc.TagValue(host)
90 attrs["port"] = irc.TagValue(port)
91 } else if hasHostPort {
92 attrs["host"] = irc.TagValue(u.Host)
93 }
94}
95
96func getNetworkAttrs(network *network) irc.Tags {
97 state := "disconnected"
98 if uc := network.conn; uc != nil {
99 state = "connected"
100 }
101
102 attrs := irc.Tags{
103 "name": irc.TagValue(network.GetName()),
104 "state": irc.TagValue(state),
105 "nickname": irc.TagValue(network.Nick),
106 }
107
108 if network.Username != "" {
109 attrs["username"] = irc.TagValue(network.Username)
110 }
111 if realname := GetRealname(&network.user.User, &network.Network); realname != "" {
112 attrs["realname"] = irc.TagValue(realname)
113 }
114
115 fillNetworkAddrAttrs(attrs, &network.Network)
116
117 return attrs
118}
119
120func networkAddrFromAttrs(attrs irc.Tags) string {
121 host, ok := attrs.GetTag("host")
122 if !ok {
123 return ""
124 }
125
126 addr := host
127 if port, ok := attrs.GetTag("port"); ok {
128 addr += ":" + port
129 }
130
131 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
132 addr = "irc+insecure://" + tlsStr
133 }
134
135 return addr
136}
137
138func updateNetworkAttrs(record *Network, attrs irc.Tags, subcommand string) error {
139 addrAttrs := irc.Tags{}
140 fillNetworkAddrAttrs(addrAttrs, record)
141
142 updateAddr := false
143 for k, v := range attrs {
144 s := string(v)
145 switch k {
146 case "host", "port", "tls":
147 updateAddr = true
148 addrAttrs[k] = v
149 case "name":
150 record.Name = s
151 case "nickname":
152 record.Nick = s
153 case "username":
154 record.Username = s
155 case "realname":
156 record.Realname = s
157 case "pass":
158 record.Pass = s
159 default:
160 return ircError{&irc.Message{
161 Command: "FAIL",
162 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
163 }}
164 }
165 }
166
167 if updateAddr {
168 record.Addr = networkAddrFromAttrs(addrAttrs)
169 if record.Addr == "" {
170 return ircError{&irc.Message{
171 Command: "FAIL",
172 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
173 }}
174 }
175 }
176
177 return nil
178}
179
180// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
181// '*' and '?' break masks, '$' breaks server masks in PRIVMSG/NOTICE
182const illegalNickChars = " :@!*?$"
183
184// permanentDownstreamCaps is the list of always-supported downstream
185// capabilities.
186var permanentDownstreamCaps = map[string]string{
187 "batch": "",
188 "cap-notify": "",
189 "echo-message": "",
190 "invite-notify": "",
191 "message-tags": "",
192 "sasl": "PLAIN",
193 "server-time": "",
194 "setname": "",
195
196 "soju.im/bouncer-networks": "",
197 "soju.im/bouncer-networks-notify": "",
198}
199
200// needAllDownstreamCaps is the list of downstream capabilities that
201// require support from all upstreams to be enabled
202var needAllDownstreamCaps = map[string]string{
203 "account-notify": "",
204 "account-tag": "",
205 "away-notify": "",
206 "extended-join": "",
207 "multi-prefix": "",
208}
209
210// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
211// through from the upstream server to downstream clients.
212//
213// This is only effective in single-upstream mode.
214var passthroughIsupport = map[string]bool{
215 "AWAYLEN": true,
216 "BOT": true,
217 "CHANLIMIT": true,
218 "CHANMODES": true,
219 "CHANNELLEN": true,
220 "CHANTYPES": true,
221 "CLIENTTAGDENY": true,
222 "EXCEPTS": true,
223 "EXTBAN": true,
224 "HOSTLEN": true,
225 "INVEX": true,
226 "KICKLEN": true,
227 "MAXLIST": true,
228 "MAXTARGETS": true,
229 "MODES": true,
230 "NAMELEN": true,
231 "NETWORK": true,
232 "NICKLEN": true,
233 "PREFIX": true,
234 "SAFELIST": true,
235 "TARGMAX": true,
236 "TOPICLEN": true,
237 "USERLEN": true,
238 "UTF8ONLY": true,
239 "WHOX": true,
240}
241
242type downstreamConn struct {
243 conn
244
245 id uint64
246
247 registered bool
248 user *user
249 nick string
250 nickCM string
251 rawUsername string
252 networkName string
253 clientName string
254 realname string
255 hostname string
256 password string // empty after authentication
257 network *network // can be nil
258
259 negotiatingCaps bool
260 capVersion int
261 supportedCaps map[string]string
262 caps map[string]bool
263
264 lastBatchRef uint64
265
266 saslServer sasl.Server
267}
268
269func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
270 remoteAddr := ic.RemoteAddr().String()
271 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
272 options := connOptions{Logger: logger}
273 dc := &downstreamConn{
274 conn: *newConn(srv, ic, &options),
275 id: id,
276 supportedCaps: make(map[string]string),
277 caps: make(map[string]bool),
278 }
279 dc.hostname = remoteAddr
280 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
281 dc.hostname = host
282 }
283 for k, v := range permanentDownstreamCaps {
284 dc.supportedCaps[k] = v
285 }
286 if srv.LogPath != "" {
287 dc.supportedCaps["draft/chathistory"] = ""
288 }
289 return dc
290}
291
292func (dc *downstreamConn) prefix() *irc.Prefix {
293 return &irc.Prefix{
294 Name: dc.nick,
295 User: dc.user.Username,
296 Host: dc.hostname,
297 }
298}
299
300func (dc *downstreamConn) forEachNetwork(f func(*network)) {
301 if dc.network != nil {
302 f(dc.network)
303 } else if !dc.caps["soju.im/bouncer-networks"] {
304 dc.user.forEachNetwork(f)
305 }
306}
307
308func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
309 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
310 return
311 }
312 dc.user.forEachUpstream(func(uc *upstreamConn) {
313 if dc.network != nil && uc.network != dc.network {
314 return
315 }
316 f(uc)
317 })
318}
319
320// upstream returns the upstream connection, if any. If there are zero or if
321// there are multiple upstream connections, it returns nil.
322func (dc *downstreamConn) upstream() *upstreamConn {
323 if dc.network == nil {
324 return nil
325 }
326 return dc.network.conn
327}
328
329func isOurNick(net *network, nick string) bool {
330 // TODO: this doesn't account for nick changes
331 if net.conn != nil {
332 return net.casemap(nick) == net.conn.nickCM
333 }
334 // We're not currently connected to the upstream connection, so we don't
335 // know whether this name is our nickname. Best-effort: use the network's
336 // configured nickname and hope it was the one being used when we were
337 // connected.
338 return net.casemap(nick) == net.casemap(net.Nick)
339}
340
341// marshalEntity converts an upstream entity name (ie. channel or nick) into a
342// downstream entity name.
343//
344// This involves adding a "/<network>" suffix if the entity isn't the current
345// user.
346func (dc *downstreamConn) marshalEntity(net *network, name string) string {
347 if isOurNick(net, name) {
348 return dc.nick
349 }
350 name = partialCasemap(net.casemap, name)
351 if dc.network != nil {
352 if dc.network != net {
353 panic("soju: tried to marshal an entity for another network")
354 }
355 return name
356 }
357 return name + "/" + net.GetName()
358}
359
360func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
361 if isOurNick(net, prefix.Name) {
362 return dc.prefix()
363 }
364 prefix.Name = partialCasemap(net.casemap, prefix.Name)
365 if dc.network != nil {
366 if dc.network != net {
367 panic("soju: tried to marshal a user prefix for another network")
368 }
369 return prefix
370 }
371 return &irc.Prefix{
372 Name: prefix.Name + "/" + net.GetName(),
373 User: prefix.User,
374 Host: prefix.Host,
375 }
376}
377
378// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
379// nick) into an upstream entity name.
380//
381// This involves removing the "/<network>" suffix.
382func (dc *downstreamConn) unmarshalEntityNetwork(name string) (*network, string, error) {
383 if dc.network != nil {
384 return dc.network, name, nil
385 }
386
387 var net *network
388 if i := strings.LastIndexByte(name, '/'); i >= 0 {
389 network := name[i+1:]
390 name = name[:i]
391
392 for _, n := range dc.user.networks {
393 if network == n.GetName() {
394 net = n
395 break
396 }
397 }
398 }
399
400 if net == nil {
401 return nil, "", ircError{&irc.Message{
402 Command: irc.ERR_NOSUCHCHANNEL,
403 Params: []string{name, "Missing network suffix in name"},
404 }}
405 }
406
407 return net, name, nil
408}
409
410// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
411// upstream connection and fails if the upstream is disconnected.
412func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
413 net, name, err := dc.unmarshalEntityNetwork(name)
414 if err != nil {
415 return nil, "", err
416 }
417
418 if net.conn == nil {
419 return nil, "", ircError{&irc.Message{
420 Command: irc.ERR_NOSUCHCHANNEL,
421 Params: []string{name, "Disconnected from upstream network"},
422 }}
423 }
424
425 return net.conn, name, nil
426}
427
428func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
429 if dc.upstream() != nil {
430 return text
431 }
432 // TODO: smarter parsing that ignores URLs
433 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
434}
435
436func (dc *downstreamConn) readMessages(ch chan<- event) error {
437 for {
438 msg, err := dc.ReadMessage()
439 if errors.Is(err, io.EOF) {
440 break
441 } else if err != nil {
442 return fmt.Errorf("failed to read IRC command: %v", err)
443 }
444
445 ch <- eventDownstreamMessage{msg, dc}
446 }
447
448 return nil
449}
450
451// SendMessage sends an outgoing message.
452//
453// This can only called from the user goroutine.
454func (dc *downstreamConn) SendMessage(msg *irc.Message) {
455 if !dc.caps["message-tags"] {
456 if msg.Command == "TAGMSG" {
457 return
458 }
459 msg = msg.Copy()
460 for name := range msg.Tags {
461 supported := false
462 switch name {
463 case "time":
464 supported = dc.caps["server-time"]
465 case "account":
466 supported = dc.caps["account"]
467 }
468 if !supported {
469 delete(msg.Tags, name)
470 }
471 }
472 }
473 if !dc.caps["batch"] && msg.Tags["batch"] != "" {
474 msg = msg.Copy()
475 delete(msg.Tags, "batch")
476 }
477 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
478 msg.Params = msg.Params[:1]
479 }
480 if msg.Command == "SETNAME" && !dc.caps["setname"] {
481 return
482 }
483 if msg.Command == "AWAY" && !dc.caps["away-notify"] {
484 return
485 }
486 if msg.Command == "ACCOUNT" && !dc.caps["account-notify"] {
487 return
488 }
489
490 dc.conn.SendMessage(msg)
491}
492
493func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
494 dc.lastBatchRef++
495 ref := fmt.Sprintf("%v", dc.lastBatchRef)
496
497 if dc.caps["batch"] {
498 dc.SendMessage(&irc.Message{
499 Tags: tags,
500 Prefix: dc.srv.prefix(),
501 Command: "BATCH",
502 Params: append([]string{"+" + ref, typ}, params...),
503 })
504 }
505
506 f(irc.TagValue(ref))
507
508 if dc.caps["batch"] {
509 dc.SendMessage(&irc.Message{
510 Prefix: dc.srv.prefix(),
511 Command: "BATCH",
512 Params: []string{"-" + ref},
513 })
514 }
515}
516
517// sendMessageWithID sends an outgoing message with the specified internal ID.
518func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
519 dc.SendMessage(msg)
520
521 if id == "" || !dc.messageSupportsHistory(msg) {
522 return
523 }
524
525 dc.sendPing(id)
526}
527
528// advanceMessageWithID advances history to the specified message ID without
529// sending a message. This is useful e.g. for self-messages when echo-message
530// isn't enabled.
531func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
532 if id == "" || !dc.messageSupportsHistory(msg) {
533 return
534 }
535
536 dc.sendPing(id)
537}
538
539// ackMsgID acknowledges that a message has been received.
540func (dc *downstreamConn) ackMsgID(id string) {
541 netID, entity, err := parseMsgID(id, nil)
542 if err != nil {
543 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
544 return
545 }
546
547 network := dc.user.getNetworkByID(netID)
548 if network == nil {
549 return
550 }
551
552 network.delivered.StoreID(entity, dc.clientName, id)
553}
554
555func (dc *downstreamConn) sendPing(msgID string) {
556 token := "soju-msgid-" + msgID
557 dc.SendMessage(&irc.Message{
558 Command: "PING",
559 Params: []string{token},
560 })
561}
562
563func (dc *downstreamConn) handlePong(token string) {
564 if !strings.HasPrefix(token, "soju-msgid-") {
565 dc.logger.Printf("received unrecognized PONG token %q", token)
566 return
567 }
568 msgID := strings.TrimPrefix(token, "soju-msgid-")
569 dc.ackMsgID(msgID)
570}
571
572// marshalMessage re-formats a message coming from an upstream connection so
573// that it's suitable for being sent on this downstream connection. Only
574// messages that may appear in logs are supported, except MODE.
575func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
576 msg = msg.Copy()
577 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
578
579 switch msg.Command {
580 case "PRIVMSG", "NOTICE", "TAGMSG":
581 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
582 case "NICK":
583 // Nick change for another user
584 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
585 case "JOIN", "PART":
586 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
587 case "KICK":
588 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
589 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
590 case "TOPIC":
591 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
592 case "QUIT", "SETNAME":
593 // This space is intentionally left blank
594 default:
595 panic(fmt.Sprintf("unexpected %q message", msg.Command))
596 }
597
598 return msg
599}
600
601func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
602 switch msg.Command {
603 case "QUIT":
604 return dc.Close()
605 default:
606 if dc.registered {
607 return dc.handleMessageRegistered(msg)
608 } else {
609 return dc.handleMessageUnregistered(msg)
610 }
611 }
612}
613
614func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
615 switch msg.Command {
616 case "NICK":
617 var nick string
618 if err := parseMessageParams(msg, &nick); err != nil {
619 return err
620 }
621 if strings.ContainsAny(nick, illegalNickChars) {
622 return ircError{&irc.Message{
623 Command: irc.ERR_ERRONEUSNICKNAME,
624 Params: []string{dc.nick, nick, "contains illegal characters"},
625 }}
626 }
627 nickCM := casemapASCII(nick)
628 if nickCM == serviceNickCM {
629 return ircError{&irc.Message{
630 Command: irc.ERR_NICKNAMEINUSE,
631 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
632 }}
633 }
634 dc.nick = nick
635 dc.nickCM = nickCM
636 case "USER":
637 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
638 return err
639 }
640 case "PASS":
641 if err := parseMessageParams(msg, &dc.password); err != nil {
642 return err
643 }
644 case "CAP":
645 var subCmd string
646 if err := parseMessageParams(msg, &subCmd); err != nil {
647 return err
648 }
649 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
650 return err
651 }
652 case "AUTHENTICATE":
653 if !dc.caps["sasl"] {
654 return ircError{&irc.Message{
655 Command: irc.ERR_SASLFAIL,
656 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
657 }}
658 }
659 if len(msg.Params) == 0 {
660 return ircError{&irc.Message{
661 Command: irc.ERR_SASLFAIL,
662 Params: []string{"*", "Missing AUTHENTICATE argument"},
663 }}
664 }
665 if dc.nick == "" {
666 return ircError{&irc.Message{
667 Command: irc.ERR_SASLFAIL,
668 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
669 }}
670 }
671
672 var resp []byte
673 if msg.Params[0] == "*" {
674 dc.saslServer = nil
675 return ircError{&irc.Message{
676 Command: irc.ERR_SASLABORTED,
677 Params: []string{"*", "SASL authentication aborted"},
678 }}
679 } else if dc.saslServer == nil {
680 mech := strings.ToUpper(msg.Params[0])
681 switch mech {
682 case "PLAIN":
683 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
684 return dc.authenticate(username, password)
685 }))
686 default:
687 return ircError{&irc.Message{
688 Command: irc.ERR_SASLFAIL,
689 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
690 }}
691 }
692 } else if msg.Params[0] == "+" {
693 resp = nil
694 } else {
695 // TODO: multi-line messages
696 var err error
697 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
698 if err != nil {
699 dc.saslServer = nil
700 return ircError{&irc.Message{
701 Command: irc.ERR_SASLFAIL,
702 Params: []string{"*", "Invalid base64-encoded response"},
703 }}
704 }
705 }
706
707 challenge, done, err := dc.saslServer.Next(resp)
708 if err != nil {
709 dc.saslServer = nil
710 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
711 return ircError{&irc.Message{
712 Command: irc.ERR_SASLFAIL,
713 Params: []string{"*", ircErr.Message.Params[1]},
714 }}
715 }
716 dc.SendMessage(&irc.Message{
717 Prefix: dc.srv.prefix(),
718 Command: irc.ERR_SASLFAIL,
719 Params: []string{"*", "SASL error"},
720 })
721 return fmt.Errorf("SASL authentication failed: %v", err)
722 } else if done {
723 dc.saslServer = nil
724 dc.SendMessage(&irc.Message{
725 Prefix: dc.srv.prefix(),
726 Command: irc.RPL_LOGGEDIN,
727 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
728 })
729 dc.SendMessage(&irc.Message{
730 Prefix: dc.srv.prefix(),
731 Command: irc.RPL_SASLSUCCESS,
732 Params: []string{dc.nick, "SASL authentication successful"},
733 })
734 } else {
735 challengeStr := "+"
736 if len(challenge) > 0 {
737 challengeStr = base64.StdEncoding.EncodeToString(challenge)
738 }
739
740 // TODO: multi-line messages
741 dc.SendMessage(&irc.Message{
742 Prefix: dc.srv.prefix(),
743 Command: "AUTHENTICATE",
744 Params: []string{challengeStr},
745 })
746 }
747 case "BOUNCER":
748 var subcommand string
749 if err := parseMessageParams(msg, &subcommand); err != nil {
750 return err
751 }
752
753 switch strings.ToUpper(subcommand) {
754 case "BIND":
755 var idStr string
756 if err := parseMessageParams(msg, nil, &idStr); err != nil {
757 return err
758 }
759
760 if dc.user == nil {
761 return ircError{&irc.Message{
762 Command: "FAIL",
763 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
764 }}
765 }
766
767 id, err := parseBouncerNetID(subcommand, idStr)
768 if err != nil {
769 return err
770 }
771
772 var match *network
773 dc.user.forEachNetwork(func(net *network) {
774 if net.ID == id {
775 match = net
776 }
777 })
778 if match == nil {
779 return ircError{&irc.Message{
780 Command: "FAIL",
781 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
782 }}
783 }
784
785 dc.networkName = match.GetName()
786 }
787 default:
788 dc.logger.Printf("unhandled message: %v", msg)
789 return newUnknownCommandError(msg.Command)
790 }
791 if dc.rawUsername != "" && dc.nick != "" && !dc.negotiatingCaps {
792 return dc.register()
793 }
794 return nil
795}
796
797func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
798 cmd = strings.ToUpper(cmd)
799
800 replyTo := dc.nick
801 if !dc.registered {
802 replyTo = "*"
803 }
804
805 switch cmd {
806 case "LS":
807 if len(args) > 0 {
808 var err error
809 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
810 return err
811 }
812 }
813 if !dc.registered && dc.capVersion >= 302 {
814 // Let downstream show everything it supports, and trim
815 // down the available capabilities when upstreams are
816 // known.
817 for k, v := range needAllDownstreamCaps {
818 dc.supportedCaps[k] = v
819 }
820 }
821
822 caps := make([]string, 0, len(dc.supportedCaps))
823 for k, v := range dc.supportedCaps {
824 if dc.capVersion >= 302 && v != "" {
825 caps = append(caps, k+"="+v)
826 } else {
827 caps = append(caps, k)
828 }
829 }
830
831 // TODO: multi-line replies
832 dc.SendMessage(&irc.Message{
833 Prefix: dc.srv.prefix(),
834 Command: "CAP",
835 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
836 })
837
838 if dc.capVersion >= 302 {
839 // CAP version 302 implicitly enables cap-notify
840 dc.caps["cap-notify"] = true
841 }
842
843 if !dc.registered {
844 dc.negotiatingCaps = true
845 }
846 case "LIST":
847 var caps []string
848 for name, enabled := range dc.caps {
849 if enabled {
850 caps = append(caps, name)
851 }
852 }
853
854 // TODO: multi-line replies
855 dc.SendMessage(&irc.Message{
856 Prefix: dc.srv.prefix(),
857 Command: "CAP",
858 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
859 })
860 case "REQ":
861 if len(args) == 0 {
862 return ircError{&irc.Message{
863 Command: err_invalidcapcmd,
864 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
865 }}
866 }
867
868 // TODO: atomically ack/nak the whole capability set
869 caps := strings.Fields(args[0])
870 ack := true
871 for _, name := range caps {
872 name = strings.ToLower(name)
873 enable := !strings.HasPrefix(name, "-")
874 if !enable {
875 name = strings.TrimPrefix(name, "-")
876 }
877
878 if enable == dc.caps[name] {
879 continue
880 }
881
882 _, ok := dc.supportedCaps[name]
883 if !ok {
884 ack = false
885 break
886 }
887
888 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
889 // cap-notify cannot be disabled with CAP version 302
890 ack = false
891 break
892 }
893
894 dc.caps[name] = enable
895 }
896
897 reply := "NAK"
898 if ack {
899 reply = "ACK"
900 }
901 dc.SendMessage(&irc.Message{
902 Prefix: dc.srv.prefix(),
903 Command: "CAP",
904 Params: []string{replyTo, reply, args[0]},
905 })
906
907 if !dc.registered {
908 dc.negotiatingCaps = true
909 }
910 case "END":
911 dc.negotiatingCaps = false
912 default:
913 return ircError{&irc.Message{
914 Command: err_invalidcapcmd,
915 Params: []string{replyTo, cmd, "Unknown CAP command"},
916 }}
917 }
918 return nil
919}
920
921func (dc *downstreamConn) setSupportedCap(name, value string) {
922 prevValue, hasPrev := dc.supportedCaps[name]
923 changed := !hasPrev || prevValue != value
924 dc.supportedCaps[name] = value
925
926 if !dc.caps["cap-notify"] || !changed {
927 return
928 }
929
930 replyTo := dc.nick
931 if !dc.registered {
932 replyTo = "*"
933 }
934
935 cap := name
936 if value != "" && dc.capVersion >= 302 {
937 cap = name + "=" + value
938 }
939
940 dc.SendMessage(&irc.Message{
941 Prefix: dc.srv.prefix(),
942 Command: "CAP",
943 Params: []string{replyTo, "NEW", cap},
944 })
945}
946
947func (dc *downstreamConn) unsetSupportedCap(name string) {
948 _, hasPrev := dc.supportedCaps[name]
949 delete(dc.supportedCaps, name)
950 delete(dc.caps, name)
951
952 if !dc.caps["cap-notify"] || !hasPrev {
953 return
954 }
955
956 replyTo := dc.nick
957 if !dc.registered {
958 replyTo = "*"
959 }
960
961 dc.SendMessage(&irc.Message{
962 Prefix: dc.srv.prefix(),
963 Command: "CAP",
964 Params: []string{replyTo, "DEL", name},
965 })
966}
967
968func (dc *downstreamConn) updateSupportedCaps() {
969 supportedCaps := make(map[string]bool)
970 for cap := range needAllDownstreamCaps {
971 supportedCaps[cap] = true
972 }
973 dc.forEachUpstream(func(uc *upstreamConn) {
974 for cap, supported := range supportedCaps {
975 supportedCaps[cap] = supported && uc.caps[cap]
976 }
977 })
978
979 for cap, supported := range supportedCaps {
980 if supported {
981 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
982 } else {
983 dc.unsetSupportedCap(cap)
984 }
985 }
986}
987
988func (dc *downstreamConn) updateNick() {
989 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
990 dc.SendMessage(&irc.Message{
991 Prefix: dc.prefix(),
992 Command: "NICK",
993 Params: []string{uc.nick},
994 })
995 dc.nick = uc.nick
996 dc.nickCM = casemapASCII(dc.nick)
997 }
998}
999
1000func (dc *downstreamConn) updateRealname() {
1001 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
1002 dc.SendMessage(&irc.Message{
1003 Prefix: dc.prefix(),
1004 Command: "SETNAME",
1005 Params: []string{uc.realname},
1006 })
1007 dc.realname = uc.realname
1008 }
1009}
1010
1011func sanityCheckServer(addr string) error {
1012 dialer := net.Dialer{Timeout: 30 * time.Second}
1013 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
1014 if err != nil {
1015 return err
1016 }
1017 return conn.Close()
1018}
1019
1020func unmarshalUsername(rawUsername string) (username, client, network string) {
1021 username = rawUsername
1022
1023 i := strings.IndexAny(username, "/@")
1024 j := strings.LastIndexAny(username, "/@")
1025 if i >= 0 {
1026 username = rawUsername[:i]
1027 }
1028 if j >= 0 {
1029 if rawUsername[j] == '@' {
1030 client = rawUsername[j+1:]
1031 } else {
1032 network = rawUsername[j+1:]
1033 }
1034 }
1035 if i >= 0 && j >= 0 && i < j {
1036 if rawUsername[i] == '@' {
1037 client = rawUsername[i+1 : j]
1038 } else {
1039 network = rawUsername[i+1 : j]
1040 }
1041 }
1042
1043 return username, client, network
1044}
1045
1046func (dc *downstreamConn) authenticate(username, password string) error {
1047 username, clientName, networkName := unmarshalUsername(username)
1048
1049 u, err := dc.srv.db.GetUser(context.TODO(), username)
1050 if err != nil {
1051 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
1052 return errAuthFailed
1053 }
1054
1055 // Password auth disabled
1056 if u.Password == "" {
1057 return errAuthFailed
1058 }
1059
1060 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
1061 if err != nil {
1062 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
1063 return errAuthFailed
1064 }
1065
1066 dc.user = dc.srv.getUser(username)
1067 if dc.user == nil {
1068 dc.logger.Printf("failed authentication for %q: user not active", username)
1069 return errAuthFailed
1070 }
1071 dc.clientName = clientName
1072 dc.networkName = networkName
1073 return nil
1074}
1075
1076func (dc *downstreamConn) register() error {
1077 if dc.registered {
1078 return fmt.Errorf("tried to register twice")
1079 }
1080
1081 password := dc.password
1082 dc.password = ""
1083 if dc.user == nil {
1084 if err := dc.authenticate(dc.rawUsername, password); err != nil {
1085 return err
1086 }
1087 }
1088
1089 if dc.clientName == "" && dc.networkName == "" {
1090 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1091 }
1092
1093 dc.registered = true
1094 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1095 return nil
1096}
1097
1098func (dc *downstreamConn) loadNetwork() error {
1099 if dc.networkName == "" {
1100 return nil
1101 }
1102
1103 network := dc.user.getNetwork(dc.networkName)
1104 if network == nil {
1105 addr := dc.networkName
1106 if !strings.ContainsRune(addr, ':') {
1107 addr = addr + ":6697"
1108 }
1109
1110 dc.logger.Printf("trying to connect to new network %q", addr)
1111 if err := sanityCheckServer(addr); err != nil {
1112 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1113 return ircError{&irc.Message{
1114 Command: irc.ERR_PASSWDMISMATCH,
1115 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1116 }}
1117 }
1118
1119 // Some clients only allow specifying the nickname (and use the
1120 // nickname as a username too). Strip the network name from the
1121 // nickname when auto-saving networks.
1122 nick, _, _ := unmarshalUsername(dc.nick)
1123
1124 dc.logger.Printf("auto-saving network %q", dc.networkName)
1125 var err error
1126 network, err = dc.user.createNetwork(&Network{
1127 Addr: dc.networkName,
1128 Nick: nick,
1129 Enabled: true,
1130 })
1131 if err != nil {
1132 return err
1133 }
1134 }
1135
1136 dc.network = network
1137 return nil
1138}
1139
1140func (dc *downstreamConn) welcome() error {
1141 if dc.user == nil || !dc.registered {
1142 panic("tried to welcome an unregistered connection")
1143 }
1144
1145 // TODO: doing this might take some time. We should do it in dc.register
1146 // instead, but we'll potentially be adding a new network and this must be
1147 // done in the user goroutine.
1148 if err := dc.loadNetwork(); err != nil {
1149 return err
1150 }
1151
1152 isupport := []string{
1153 fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
1154 "CASEMAPPING=ascii",
1155 }
1156
1157 if dc.network != nil {
1158 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1159 }
1160
1161 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
1162 isupport = append(isupport, "WHOX")
1163 }
1164
1165 if uc := dc.upstream(); uc != nil {
1166 for k := range passthroughIsupport {
1167 v, ok := uc.isupport[k]
1168 if !ok {
1169 continue
1170 }
1171 if v != nil {
1172 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1173 } else {
1174 isupport = append(isupport, k)
1175 }
1176 }
1177 }
1178
1179 dc.SendMessage(&irc.Message{
1180 Prefix: dc.srv.prefix(),
1181 Command: irc.RPL_WELCOME,
1182 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1183 })
1184 dc.SendMessage(&irc.Message{
1185 Prefix: dc.srv.prefix(),
1186 Command: irc.RPL_YOURHOST,
1187 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1188 })
1189 dc.SendMessage(&irc.Message{
1190 Prefix: dc.srv.prefix(),
1191 Command: irc.RPL_MYINFO,
1192 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1193 })
1194 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1195 dc.SendMessage(msg)
1196 }
1197 if uc := dc.upstream(); uc != nil {
1198 dc.SendMessage(&irc.Message{
1199 Prefix: dc.srv.prefix(),
1200 Command: irc.RPL_UMODEIS,
1201 Params: []string{dc.nick, string(uc.modes)},
1202 })
1203 }
1204
1205 if motd := dc.user.srv.MOTD(); motd != "" && dc.network == nil {
1206 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1207 dc.SendMessage(msg)
1208 }
1209 } else {
1210 motdHint := "No MOTD"
1211 if dc.network != nil {
1212 motdHint = "Use /motd to read the message of the day"
1213 }
1214 dc.SendMessage(&irc.Message{
1215 Prefix: dc.srv.prefix(),
1216 Command: irc.ERR_NOMOTD,
1217 Params: []string{dc.nick, motdHint},
1218 })
1219 }
1220
1221 dc.updateNick()
1222 dc.updateRealname()
1223 dc.updateSupportedCaps()
1224
1225 if dc.caps["soju.im/bouncer-networks-notify"] {
1226 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1227 dc.user.forEachNetwork(func(network *network) {
1228 idStr := fmt.Sprintf("%v", network.ID)
1229 attrs := getNetworkAttrs(network)
1230 dc.SendMessage(&irc.Message{
1231 Tags: irc.Tags{"batch": batchRef},
1232 Prefix: dc.srv.prefix(),
1233 Command: "BOUNCER",
1234 Params: []string{"NETWORK", idStr, attrs.String()},
1235 })
1236 })
1237 })
1238 }
1239
1240 dc.forEachUpstream(func(uc *upstreamConn) {
1241 for _, entry := range uc.channels.innerMap {
1242 ch := entry.value.(*upstreamChannel)
1243 if !ch.complete {
1244 continue
1245 }
1246 record := uc.network.channels.Value(ch.Name)
1247 if record != nil && record.Detached {
1248 continue
1249 }
1250
1251 dc.SendMessage(&irc.Message{
1252 Prefix: dc.prefix(),
1253 Command: "JOIN",
1254 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1255 })
1256
1257 forwardChannel(dc, ch)
1258 }
1259 })
1260
1261 dc.forEachNetwork(func(net *network) {
1262 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1263 return
1264 }
1265
1266 // Only send history if we're the first connected client with that name
1267 // for the network
1268 firstClient := true
1269 dc.user.forEachDownstream(func(c *downstreamConn) {
1270 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1271 firstClient = false
1272 }
1273 })
1274 if firstClient {
1275 net.delivered.ForEachTarget(func(target string) {
1276 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1277 if lastDelivered == "" {
1278 return
1279 }
1280
1281 dc.sendTargetBacklog(net, target, lastDelivered)
1282
1283 // Fast-forward history to last message
1284 targetCM := net.casemap(target)
1285 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1286 if err != nil {
1287 dc.logger.Printf("failed to get last message ID: %v", err)
1288 return
1289 }
1290 net.delivered.StoreID(target, dc.clientName, lastID)
1291 })
1292 }
1293 })
1294
1295 return nil
1296}
1297
1298// messageSupportsHistory checks whether the provided message can be sent as
1299// part of an history batch.
1300func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1301 // Don't replay all messages, because that would mess up client
1302 // state. For instance we just sent the list of users, sending
1303 // PART messages for one of these users would be incorrect.
1304 // TODO: add support for draft/event-playback
1305 switch msg.Command {
1306 case "PRIVMSG", "NOTICE":
1307 return true
1308 }
1309 return false
1310}
1311
1312func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1313 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1314 return
1315 }
1316
1317 ch := net.channels.Value(target)
1318
1319 limit := 4000
1320 targetCM := net.casemap(target)
1321 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1322 if err != nil {
1323 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1324 return
1325 }
1326
1327 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1328 for _, msg := range history {
1329 if !dc.messageSupportsHistory(msg) {
1330 continue
1331 }
1332
1333 if ch != nil && ch.Detached {
1334 if net.detachedMessageNeedsRelay(ch, msg) {
1335 dc.relayDetachedMessage(net, msg)
1336 }
1337 } else {
1338 msg.Tags["batch"] = batchRef
1339 dc.SendMessage(dc.marshalMessage(msg, net))
1340 }
1341 }
1342 })
1343}
1344
1345func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1346 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1347 return
1348 }
1349
1350 sender := msg.Prefix.Name
1351 target, text := msg.Params[0], msg.Params[1]
1352 if net.isHighlight(msg) {
1353 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1354 } else {
1355 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1356 }
1357}
1358
1359func (dc *downstreamConn) runUntilRegistered() error {
1360 for !dc.registered {
1361 msg, err := dc.ReadMessage()
1362 if err != nil {
1363 return fmt.Errorf("failed to read IRC command: %w", err)
1364 }
1365
1366 err = dc.handleMessage(msg)
1367 if ircErr, ok := err.(ircError); ok {
1368 ircErr.Message.Prefix = dc.srv.prefix()
1369 dc.SendMessage(ircErr.Message)
1370 } else if err != nil {
1371 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1372 }
1373 }
1374
1375 return nil
1376}
1377
1378func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1379 switch msg.Command {
1380 case "CAP":
1381 var subCmd string
1382 if err := parseMessageParams(msg, &subCmd); err != nil {
1383 return err
1384 }
1385 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1386 return err
1387 }
1388 case "PING":
1389 var source, destination string
1390 if err := parseMessageParams(msg, &source); err != nil {
1391 return err
1392 }
1393 if len(msg.Params) > 1 {
1394 destination = msg.Params[1]
1395 }
1396 if destination != "" && destination != dc.srv.Hostname {
1397 return ircError{&irc.Message{
1398 Command: irc.ERR_NOSUCHSERVER,
1399 Params: []string{dc.nick, destination, "No such server"},
1400 }}
1401 }
1402 dc.SendMessage(&irc.Message{
1403 Prefix: dc.srv.prefix(),
1404 Command: "PONG",
1405 Params: []string{dc.srv.Hostname, source},
1406 })
1407 return nil
1408 case "PONG":
1409 if len(msg.Params) == 0 {
1410 return newNeedMoreParamsError(msg.Command)
1411 }
1412 token := msg.Params[len(msg.Params)-1]
1413 dc.handlePong(token)
1414 case "USER":
1415 return ircError{&irc.Message{
1416 Command: irc.ERR_ALREADYREGISTERED,
1417 Params: []string{dc.nick, "You may not reregister"},
1418 }}
1419 case "NICK":
1420 var rawNick string
1421 if err := parseMessageParams(msg, &rawNick); err != nil {
1422 return err
1423 }
1424
1425 nick := rawNick
1426 var upstream *upstreamConn
1427 if dc.upstream() == nil {
1428 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1429 if err == nil { // NICK nick/network: NICK only on a specific upstream
1430 upstream = uc
1431 nick = unmarshaledNick
1432 }
1433 }
1434
1435 if strings.ContainsAny(nick, illegalNickChars) {
1436 return ircError{&irc.Message{
1437 Command: irc.ERR_ERRONEUSNICKNAME,
1438 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1439 }}
1440 }
1441 if casemapASCII(nick) == serviceNickCM {
1442 return ircError{&irc.Message{
1443 Command: irc.ERR_NICKNAMEINUSE,
1444 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1445 }}
1446 }
1447
1448 var err error
1449 dc.forEachNetwork(func(n *network) {
1450 if err != nil || (upstream != nil && upstream.network != n) {
1451 return
1452 }
1453 n.Nick = nick
1454 err = dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network)
1455 })
1456 if err != nil {
1457 return err
1458 }
1459
1460 dc.forEachUpstream(func(uc *upstreamConn) {
1461 if upstream != nil && upstream != uc {
1462 return
1463 }
1464 uc.SendMessageLabeled(dc.id, &irc.Message{
1465 Command: "NICK",
1466 Params: []string{nick},
1467 })
1468 })
1469
1470 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1471 dc.SendMessage(&irc.Message{
1472 Prefix: dc.prefix(),
1473 Command: "NICK",
1474 Params: []string{nick},
1475 })
1476 dc.nick = nick
1477 dc.nickCM = casemapASCII(dc.nick)
1478 }
1479 case "SETNAME":
1480 var realname string
1481 if err := parseMessageParams(msg, &realname); err != nil {
1482 return err
1483 }
1484
1485 // If the client just resets to the default, just wipe the per-network
1486 // preference
1487 storeRealname := realname
1488 if realname == dc.user.Realname {
1489 storeRealname = ""
1490 }
1491
1492 var storeErr error
1493 var needUpdate []Network
1494 dc.forEachNetwork(func(n *network) {
1495 // We only need to call updateNetwork for upstreams that don't
1496 // support setname
1497 if uc := n.conn; uc != nil && uc.caps["setname"] {
1498 uc.SendMessageLabeled(dc.id, &irc.Message{
1499 Command: "SETNAME",
1500 Params: []string{realname},
1501 })
1502
1503 n.Realname = storeRealname
1504 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
1505 dc.logger.Printf("failed to store network realname: %v", err)
1506 storeErr = err
1507 }
1508 return
1509 }
1510
1511 record := n.Network // copy network record because we'll mutate it
1512 record.Realname = storeRealname
1513 needUpdate = append(needUpdate, record)
1514 })
1515
1516 // Walk the network list as a second step, because updateNetwork
1517 // mutates the original list
1518 for _, record := range needUpdate {
1519 if _, err := dc.user.updateNetwork(&record); err != nil {
1520 dc.logger.Printf("failed to update network realname: %v", err)
1521 storeErr = err
1522 }
1523 }
1524 if storeErr != nil {
1525 return ircError{&irc.Message{
1526 Command: "FAIL",
1527 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1528 }}
1529 }
1530
1531 if dc.upstream() == nil {
1532 dc.SendMessage(&irc.Message{
1533 Prefix: dc.prefix(),
1534 Command: "SETNAME",
1535 Params: []string{realname},
1536 })
1537 }
1538 case "JOIN":
1539 var namesStr string
1540 if err := parseMessageParams(msg, &namesStr); err != nil {
1541 return err
1542 }
1543
1544 var keys []string
1545 if len(msg.Params) > 1 {
1546 keys = strings.Split(msg.Params[1], ",")
1547 }
1548
1549 for i, name := range strings.Split(namesStr, ",") {
1550 uc, upstreamName, err := dc.unmarshalEntity(name)
1551 if err != nil {
1552 return err
1553 }
1554
1555 var key string
1556 if len(keys) > i {
1557 key = keys[i]
1558 }
1559
1560 if !uc.isChannel(upstreamName) {
1561 dc.SendMessage(&irc.Message{
1562 Prefix: dc.srv.prefix(),
1563 Command: irc.ERR_NOSUCHCHANNEL,
1564 Params: []string{name, "Not a channel name"},
1565 })
1566 continue
1567 }
1568
1569 params := []string{upstreamName}
1570 if key != "" {
1571 params = append(params, key)
1572 }
1573 uc.SendMessageLabeled(dc.id, &irc.Message{
1574 Command: "JOIN",
1575 Params: params,
1576 })
1577
1578 ch := uc.network.channels.Value(upstreamName)
1579 if ch != nil {
1580 // Don't clear the channel key if there's one set
1581 // TODO: add a way to unset the channel key
1582 if key != "" {
1583 ch.Key = key
1584 }
1585 uc.network.attach(ch)
1586 } else {
1587 ch = &Channel{
1588 Name: upstreamName,
1589 Key: key,
1590 }
1591 uc.network.channels.SetValue(upstreamName, ch)
1592 }
1593 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1594 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1595 }
1596 }
1597 case "PART":
1598 var namesStr string
1599 if err := parseMessageParams(msg, &namesStr); err != nil {
1600 return err
1601 }
1602
1603 var reason string
1604 if len(msg.Params) > 1 {
1605 reason = msg.Params[1]
1606 }
1607
1608 for _, name := range strings.Split(namesStr, ",") {
1609 uc, upstreamName, err := dc.unmarshalEntity(name)
1610 if err != nil {
1611 return err
1612 }
1613
1614 if strings.EqualFold(reason, "detach") {
1615 ch := uc.network.channels.Value(upstreamName)
1616 if ch != nil {
1617 uc.network.detach(ch)
1618 } else {
1619 ch = &Channel{
1620 Name: name,
1621 Detached: true,
1622 }
1623 uc.network.channels.SetValue(upstreamName, ch)
1624 }
1625 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1626 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1627 }
1628 } else {
1629 params := []string{upstreamName}
1630 if reason != "" {
1631 params = append(params, reason)
1632 }
1633 uc.SendMessageLabeled(dc.id, &irc.Message{
1634 Command: "PART",
1635 Params: params,
1636 })
1637
1638 if err := uc.network.deleteChannel(upstreamName); err != nil {
1639 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1640 }
1641 }
1642 }
1643 case "KICK":
1644 var channelStr, userStr string
1645 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1646 return err
1647 }
1648
1649 channels := strings.Split(channelStr, ",")
1650 users := strings.Split(userStr, ",")
1651
1652 var reason string
1653 if len(msg.Params) > 2 {
1654 reason = msg.Params[2]
1655 }
1656
1657 if len(channels) != 1 && len(channels) != len(users) {
1658 return ircError{&irc.Message{
1659 Command: irc.ERR_BADCHANMASK,
1660 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1661 }}
1662 }
1663
1664 for i, user := range users {
1665 var channel string
1666 if len(channels) == 1 {
1667 channel = channels[0]
1668 } else {
1669 channel = channels[i]
1670 }
1671
1672 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1673 if err != nil {
1674 return err
1675 }
1676
1677 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1678 if err != nil {
1679 return err
1680 }
1681
1682 if ucChannel != ucUser {
1683 return ircError{&irc.Message{
1684 Command: irc.ERR_USERNOTINCHANNEL,
1685 Params: []string{dc.nick, user, channel, "They are on another network"},
1686 }}
1687 }
1688 uc := ucChannel
1689
1690 params := []string{upstreamChannel, upstreamUser}
1691 if reason != "" {
1692 params = append(params, reason)
1693 }
1694 uc.SendMessageLabeled(dc.id, &irc.Message{
1695 Command: "KICK",
1696 Params: params,
1697 })
1698 }
1699 case "MODE":
1700 var name string
1701 if err := parseMessageParams(msg, &name); err != nil {
1702 return err
1703 }
1704
1705 var modeStr string
1706 if len(msg.Params) > 1 {
1707 modeStr = msg.Params[1]
1708 }
1709
1710 if casemapASCII(name) == dc.nickCM {
1711 if modeStr != "" {
1712 if uc := dc.upstream(); uc != nil {
1713 uc.SendMessageLabeled(dc.id, &irc.Message{
1714 Command: "MODE",
1715 Params: []string{uc.nick, modeStr},
1716 })
1717 } else {
1718 dc.SendMessage(&irc.Message{
1719 Prefix: dc.srv.prefix(),
1720 Command: irc.ERR_UMODEUNKNOWNFLAG,
1721 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1722 })
1723 }
1724 } else {
1725 var userMode string
1726 if uc := dc.upstream(); uc != nil {
1727 userMode = string(uc.modes)
1728 }
1729
1730 dc.SendMessage(&irc.Message{
1731 Prefix: dc.srv.prefix(),
1732 Command: irc.RPL_UMODEIS,
1733 Params: []string{dc.nick, userMode},
1734 })
1735 }
1736 return nil
1737 }
1738
1739 uc, upstreamName, err := dc.unmarshalEntity(name)
1740 if err != nil {
1741 return err
1742 }
1743
1744 if !uc.isChannel(upstreamName) {
1745 return ircError{&irc.Message{
1746 Command: irc.ERR_USERSDONTMATCH,
1747 Params: []string{dc.nick, "Cannot change mode for other users"},
1748 }}
1749 }
1750
1751 if modeStr != "" {
1752 params := []string{upstreamName, modeStr}
1753 params = append(params, msg.Params[2:]...)
1754 uc.SendMessageLabeled(dc.id, &irc.Message{
1755 Command: "MODE",
1756 Params: params,
1757 })
1758 } else {
1759 ch := uc.channels.Value(upstreamName)
1760 if ch == nil {
1761 return ircError{&irc.Message{
1762 Command: irc.ERR_NOSUCHCHANNEL,
1763 Params: []string{dc.nick, name, "No such channel"},
1764 }}
1765 }
1766
1767 if ch.modes == nil {
1768 // we haven't received the initial RPL_CHANNELMODEIS yet
1769 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1770 return nil
1771 }
1772
1773 modeStr, modeParams := ch.modes.Format()
1774 params := []string{dc.nick, name, modeStr}
1775 params = append(params, modeParams...)
1776
1777 dc.SendMessage(&irc.Message{
1778 Prefix: dc.srv.prefix(),
1779 Command: irc.RPL_CHANNELMODEIS,
1780 Params: params,
1781 })
1782 if ch.creationTime != "" {
1783 dc.SendMessage(&irc.Message{
1784 Prefix: dc.srv.prefix(),
1785 Command: rpl_creationtime,
1786 Params: []string{dc.nick, name, ch.creationTime},
1787 })
1788 }
1789 }
1790 case "TOPIC":
1791 var channel string
1792 if err := parseMessageParams(msg, &channel); err != nil {
1793 return err
1794 }
1795
1796 uc, upstreamName, err := dc.unmarshalEntity(channel)
1797 if err != nil {
1798 return err
1799 }
1800
1801 if len(msg.Params) > 1 { // setting topic
1802 topic := msg.Params[1]
1803 uc.SendMessageLabeled(dc.id, &irc.Message{
1804 Command: "TOPIC",
1805 Params: []string{upstreamName, topic},
1806 })
1807 } else { // getting topic
1808 ch := uc.channels.Value(upstreamName)
1809 if ch == nil {
1810 return ircError{&irc.Message{
1811 Command: irc.ERR_NOSUCHCHANNEL,
1812 Params: []string{dc.nick, upstreamName, "No such channel"},
1813 }}
1814 }
1815 sendTopic(dc, ch)
1816 }
1817 case "LIST":
1818 // TODO: support ELIST when supported by all upstreams
1819
1820 pl := pendingLIST{
1821 downstreamID: dc.id,
1822 pendingCommands: make(map[int64]*irc.Message),
1823 }
1824 var upstream *upstreamConn
1825 var upstreamChannels map[int64][]string
1826 if len(msg.Params) > 0 {
1827 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1828 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1829 upstream = uc
1830 } else {
1831 upstreamChannels = make(map[int64][]string)
1832 channels := strings.Split(msg.Params[0], ",")
1833 for _, channel := range channels {
1834 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1835 if err != nil {
1836 return err
1837 }
1838 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1839 }
1840 }
1841 }
1842
1843 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1844 dc.forEachUpstream(func(uc *upstreamConn) {
1845 if upstream != nil && upstream != uc {
1846 return
1847 }
1848 var params []string
1849 if upstreamChannels != nil {
1850 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1851 params = []string{strings.Join(channels, ",")}
1852 } else {
1853 return
1854 }
1855 }
1856 pl.pendingCommands[uc.network.ID] = &irc.Message{
1857 Command: "LIST",
1858 Params: params,
1859 }
1860 uc.trySendLIST(dc.id)
1861 })
1862 case "NAMES":
1863 if len(msg.Params) == 0 {
1864 dc.SendMessage(&irc.Message{
1865 Prefix: dc.srv.prefix(),
1866 Command: irc.RPL_ENDOFNAMES,
1867 Params: []string{dc.nick, "*", "End of /NAMES list"},
1868 })
1869 return nil
1870 }
1871
1872 channels := strings.Split(msg.Params[0], ",")
1873 for _, channel := range channels {
1874 uc, upstreamName, err := dc.unmarshalEntity(channel)
1875 if err != nil {
1876 return err
1877 }
1878
1879 ch := uc.channels.Value(upstreamName)
1880 if ch != nil {
1881 sendNames(dc, ch)
1882 } else {
1883 // NAMES on a channel we have not joined, ask upstream
1884 uc.SendMessageLabeled(dc.id, &irc.Message{
1885 Command: "NAMES",
1886 Params: []string{upstreamName},
1887 })
1888 }
1889 }
1890 // For WHOX docs, see:
1891 // - http://faerion.sourceforge.net/doc/irc/whox.var
1892 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1893 // Note, many features aren't widely implemented, such as flags and mask2
1894 case "WHO":
1895 if len(msg.Params) == 0 {
1896 // TODO: support WHO without parameters
1897 dc.SendMessage(&irc.Message{
1898 Prefix: dc.srv.prefix(),
1899 Command: irc.RPL_ENDOFWHO,
1900 Params: []string{dc.nick, "*", "End of /WHO list"},
1901 })
1902 return nil
1903 }
1904
1905 // Clients will use the first mask to match RPL_ENDOFWHO
1906 endOfWhoToken := msg.Params[0]
1907
1908 // TODO: add support for WHOX mask2
1909 mask := msg.Params[0]
1910 var options string
1911 if len(msg.Params) > 1 {
1912 options = msg.Params[1]
1913 }
1914
1915 optionsParts := strings.SplitN(options, "%", 2)
1916 // TODO: add support for WHOX flags in optionsParts[0]
1917 var fields, whoxToken string
1918 if len(optionsParts) == 2 {
1919 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1920 fields = strings.ToLower(optionsParts[0])
1921 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1922 whoxToken = optionsParts[1]
1923 }
1924 }
1925
1926 // TODO: support mixed bouncer/upstream WHO queries
1927 maskCM := casemapASCII(mask)
1928 if dc.network == nil && maskCM == dc.nickCM {
1929 // TODO: support AWAY (H/G) in self WHO reply
1930 flags := "H"
1931 if dc.user.Admin {
1932 flags += "*"
1933 }
1934 info := whoxInfo{
1935 Token: whoxToken,
1936 Username: dc.user.Username,
1937 Hostname: dc.hostname,
1938 Server: dc.srv.Hostname,
1939 Nickname: dc.nick,
1940 Flags: flags,
1941 Account: dc.user.Username,
1942 Realname: dc.realname,
1943 }
1944 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1945 dc.SendMessage(&irc.Message{
1946 Prefix: dc.srv.prefix(),
1947 Command: irc.RPL_ENDOFWHO,
1948 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1949 })
1950 return nil
1951 }
1952 if maskCM == serviceNickCM {
1953 info := whoxInfo{
1954 Token: whoxToken,
1955 Username: servicePrefix.User,
1956 Hostname: servicePrefix.Host,
1957 Server: dc.srv.Hostname,
1958 Nickname: serviceNick,
1959 Flags: "H*",
1960 Account: serviceNick,
1961 Realname: serviceRealname,
1962 }
1963 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1964 dc.SendMessage(&irc.Message{
1965 Prefix: dc.srv.prefix(),
1966 Command: irc.RPL_ENDOFWHO,
1967 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1968 })
1969 return nil
1970 }
1971
1972 // TODO: properly support WHO masks
1973 uc, upstreamMask, err := dc.unmarshalEntity(mask)
1974 if err != nil {
1975 return err
1976 }
1977
1978 params := []string{upstreamMask}
1979 if options != "" {
1980 params = append(params, options)
1981 }
1982
1983 uc.SendMessageLabeled(dc.id, &irc.Message{
1984 Command: "WHO",
1985 Params: params,
1986 })
1987 case "WHOIS":
1988 if len(msg.Params) == 0 {
1989 return ircError{&irc.Message{
1990 Command: irc.ERR_NONICKNAMEGIVEN,
1991 Params: []string{dc.nick, "No nickname given"},
1992 }}
1993 }
1994
1995 var target, mask string
1996 if len(msg.Params) == 1 {
1997 target = ""
1998 mask = msg.Params[0]
1999 } else {
2000 target = msg.Params[0]
2001 mask = msg.Params[1]
2002 }
2003 // TODO: support multiple WHOIS users
2004 if i := strings.IndexByte(mask, ','); i >= 0 {
2005 mask = mask[:i]
2006 }
2007
2008 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2009 dc.SendMessage(&irc.Message{
2010 Prefix: dc.srv.prefix(),
2011 Command: irc.RPL_WHOISUSER,
2012 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2013 })
2014 dc.SendMessage(&irc.Message{
2015 Prefix: dc.srv.prefix(),
2016 Command: irc.RPL_WHOISSERVER,
2017 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
2018 })
2019 if dc.user.Admin {
2020 dc.SendMessage(&irc.Message{
2021 Prefix: dc.srv.prefix(),
2022 Command: irc.RPL_WHOISOPERATOR,
2023 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2024 })
2025 }
2026 dc.SendMessage(&irc.Message{
2027 Prefix: dc.srv.prefix(),
2028 Command: rpl_whoisaccount,
2029 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2030 })
2031 dc.SendMessage(&irc.Message{
2032 Prefix: dc.srv.prefix(),
2033 Command: irc.RPL_ENDOFWHOIS,
2034 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2035 })
2036 return nil
2037 }
2038 if casemapASCII(mask) == serviceNickCM {
2039 dc.SendMessage(&irc.Message{
2040 Prefix: dc.srv.prefix(),
2041 Command: irc.RPL_WHOISUSER,
2042 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2043 })
2044 dc.SendMessage(&irc.Message{
2045 Prefix: dc.srv.prefix(),
2046 Command: irc.RPL_WHOISSERVER,
2047 Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
2048 })
2049 dc.SendMessage(&irc.Message{
2050 Prefix: dc.srv.prefix(),
2051 Command: irc.RPL_WHOISOPERATOR,
2052 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2053 })
2054 dc.SendMessage(&irc.Message{
2055 Prefix: dc.srv.prefix(),
2056 Command: rpl_whoisaccount,
2057 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2058 })
2059 dc.SendMessage(&irc.Message{
2060 Prefix: dc.srv.prefix(),
2061 Command: irc.RPL_ENDOFWHOIS,
2062 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2063 })
2064 return nil
2065 }
2066
2067 // TODO: support WHOIS masks
2068 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2069 if err != nil {
2070 return err
2071 }
2072
2073 var params []string
2074 if target != "" {
2075 if target == mask { // WHOIS nick nick
2076 params = []string{upstreamNick, upstreamNick}
2077 } else {
2078 params = []string{target, upstreamNick}
2079 }
2080 } else {
2081 params = []string{upstreamNick}
2082 }
2083
2084 uc.SendMessageLabeled(dc.id, &irc.Message{
2085 Command: "WHOIS",
2086 Params: params,
2087 })
2088 case "PRIVMSG", "NOTICE":
2089 var targetsStr, text string
2090 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2091 return err
2092 }
2093 tags := copyClientTags(msg.Tags)
2094
2095 for _, name := range strings.Split(targetsStr, ",") {
2096 if name == "$"+dc.srv.Hostname || (name == "$*" && dc.network == nil) {
2097 // "$" means a server mask follows. If it's the bouncer's
2098 // hostname, broadcast the message to all bouncer users.
2099 if !dc.user.Admin {
2100 return ircError{&irc.Message{
2101 Prefix: dc.srv.prefix(),
2102 Command: irc.ERR_BADMASK,
2103 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2104 }}
2105 }
2106
2107 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2108
2109 broadcastTags := tags.Copy()
2110 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2111 broadcastMsg := &irc.Message{
2112 Tags: broadcastTags,
2113 Prefix: servicePrefix,
2114 Command: msg.Command,
2115 Params: []string{name, text},
2116 }
2117 dc.srv.forEachUser(func(u *user) {
2118 u.events <- eventBroadcast{broadcastMsg}
2119 })
2120 continue
2121 }
2122
2123 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2124 dc.SendMessage(&irc.Message{
2125 Tags: msg.Tags.Copy(),
2126 Prefix: dc.prefix(),
2127 Command: msg.Command,
2128 Params: []string{name, text},
2129 })
2130 continue
2131 }
2132
2133 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2134 if dc.caps["echo-message"] {
2135 echoTags := tags.Copy()
2136 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2137 dc.SendMessage(&irc.Message{
2138 Tags: echoTags,
2139 Prefix: dc.prefix(),
2140 Command: msg.Command,
2141 Params: []string{name, text},
2142 })
2143 }
2144 handleServicePRIVMSG(dc, text)
2145 continue
2146 }
2147
2148 uc, upstreamName, err := dc.unmarshalEntity(name)
2149 if err != nil {
2150 return err
2151 }
2152
2153 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2154 dc.handleNickServPRIVMSG(uc, text)
2155 }
2156
2157 unmarshaledText := text
2158 if uc.isChannel(upstreamName) {
2159 unmarshaledText = dc.unmarshalText(uc, text)
2160 }
2161 uc.SendMessageLabeled(dc.id, &irc.Message{
2162 Tags: tags,
2163 Command: msg.Command,
2164 Params: []string{upstreamName, unmarshaledText},
2165 })
2166
2167 echoTags := tags.Copy()
2168 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2169 if uc.account != "" {
2170 echoTags["account"] = irc.TagValue(uc.account)
2171 }
2172 echoMsg := &irc.Message{
2173 Tags: echoTags,
2174 Prefix: &irc.Prefix{
2175 Name: uc.nick,
2176 User: uc.username,
2177 },
2178 Command: msg.Command,
2179 Params: []string{upstreamName, text},
2180 }
2181 uc.produce(upstreamName, echoMsg, dc)
2182
2183 uc.updateChannelAutoDetach(upstreamName)
2184 }
2185 case "TAGMSG":
2186 var targetsStr string
2187 if err := parseMessageParams(msg, &targetsStr); err != nil {
2188 return err
2189 }
2190 tags := copyClientTags(msg.Tags)
2191
2192 for _, name := range strings.Split(targetsStr, ",") {
2193 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2194 dc.SendMessage(&irc.Message{
2195 Tags: msg.Tags.Copy(),
2196 Prefix: dc.prefix(),
2197 Command: "TAGMSG",
2198 Params: []string{name},
2199 })
2200 continue
2201 }
2202
2203 if casemapASCII(name) == serviceNickCM {
2204 continue
2205 }
2206
2207 uc, upstreamName, err := dc.unmarshalEntity(name)
2208 if err != nil {
2209 return err
2210 }
2211 if _, ok := uc.caps["message-tags"]; !ok {
2212 continue
2213 }
2214
2215 uc.SendMessageLabeled(dc.id, &irc.Message{
2216 Tags: tags,
2217 Command: "TAGMSG",
2218 Params: []string{upstreamName},
2219 })
2220
2221 uc.updateChannelAutoDetach(upstreamName)
2222 }
2223 case "INVITE":
2224 var user, channel string
2225 if err := parseMessageParams(msg, &user, &channel); err != nil {
2226 return err
2227 }
2228
2229 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2230 if err != nil {
2231 return err
2232 }
2233
2234 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2235 if err != nil {
2236 return err
2237 }
2238
2239 if ucChannel != ucUser {
2240 return ircError{&irc.Message{
2241 Command: irc.ERR_USERNOTINCHANNEL,
2242 Params: []string{dc.nick, user, channel, "They are on another network"},
2243 }}
2244 }
2245 uc := ucChannel
2246
2247 uc.SendMessageLabeled(dc.id, &irc.Message{
2248 Command: "INVITE",
2249 Params: []string{upstreamUser, upstreamChannel},
2250 })
2251 case "CHATHISTORY":
2252 var subcommand string
2253 if err := parseMessageParams(msg, &subcommand); err != nil {
2254 return err
2255 }
2256 var target, limitStr string
2257 var boundsStr [2]string
2258 switch subcommand {
2259 case "AFTER", "BEFORE":
2260 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2261 return err
2262 }
2263 case "BETWEEN":
2264 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2265 return err
2266 }
2267 case "TARGETS":
2268 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2269 return err
2270 }
2271 default:
2272 // TODO: support LATEST, AROUND
2273 return ircError{&irc.Message{
2274 Command: "FAIL",
2275 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2276 }}
2277 }
2278
2279 // We don't save history for our service
2280 if casemapASCII(target) == serviceNickCM {
2281 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2282 return nil
2283 }
2284
2285 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2286 if !ok {
2287 return ircError{&irc.Message{
2288 Command: irc.ERR_UNKNOWNCOMMAND,
2289 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2290 }}
2291 }
2292
2293 network, entity, err := dc.unmarshalEntityNetwork(target)
2294 if err != nil {
2295 return err
2296 }
2297 entity = network.casemap(entity)
2298
2299 // TODO: support msgid criteria
2300 var bounds [2]time.Time
2301 bounds[0] = parseChatHistoryBound(boundsStr[0])
2302 if bounds[0].IsZero() {
2303 return ircError{&irc.Message{
2304 Command: "FAIL",
2305 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2306 }}
2307 }
2308
2309 if boundsStr[1] != "" {
2310 bounds[1] = parseChatHistoryBound(boundsStr[1])
2311 if bounds[1].IsZero() {
2312 return ircError{&irc.Message{
2313 Command: "FAIL",
2314 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2315 }}
2316 }
2317 }
2318
2319 limit, err := strconv.Atoi(limitStr)
2320 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
2321 return ircError{&irc.Message{
2322 Command: "FAIL",
2323 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2324 }}
2325 }
2326
2327 var history []*irc.Message
2328 switch subcommand {
2329 case "BEFORE":
2330 history, err = store.LoadBeforeTime(network, entity, bounds[0], time.Time{}, limit)
2331 case "AFTER":
2332 history, err = store.LoadAfterTime(network, entity, bounds[0], time.Now(), limit)
2333 case "BETWEEN":
2334 if bounds[0].Before(bounds[1]) {
2335 history, err = store.LoadAfterTime(network, entity, bounds[0], bounds[1], limit)
2336 } else {
2337 history, err = store.LoadBeforeTime(network, entity, bounds[0], bounds[1], limit)
2338 }
2339 case "TARGETS":
2340 // TODO: support TARGETS in multi-upstream mode
2341 targets, err := store.ListTargets(network, bounds[0], bounds[1], limit)
2342 if err != nil {
2343 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2344 return ircError{&irc.Message{
2345 Command: "FAIL",
2346 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2347 }}
2348 }
2349
2350 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2351 for _, target := range targets {
2352 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2353 continue
2354 }
2355
2356 dc.SendMessage(&irc.Message{
2357 Tags: irc.Tags{"batch": batchRef},
2358 Prefix: dc.srv.prefix(),
2359 Command: "CHATHISTORY",
2360 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2361 })
2362 }
2363 })
2364
2365 return nil
2366 }
2367 if err != nil {
2368 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2369 return newChatHistoryError(subcommand, target)
2370 }
2371
2372 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2373 for _, msg := range history {
2374 msg.Tags["batch"] = batchRef
2375 dc.SendMessage(dc.marshalMessage(msg, network))
2376 }
2377 })
2378 case "BOUNCER":
2379 var subcommand string
2380 if err := parseMessageParams(msg, &subcommand); err != nil {
2381 return err
2382 }
2383
2384 switch strings.ToUpper(subcommand) {
2385 case "BIND":
2386 return ircError{&irc.Message{
2387 Command: "FAIL",
2388 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2389 }}
2390 case "LISTNETWORKS":
2391 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2392 dc.user.forEachNetwork(func(network *network) {
2393 idStr := fmt.Sprintf("%v", network.ID)
2394 attrs := getNetworkAttrs(network)
2395 dc.SendMessage(&irc.Message{
2396 Tags: irc.Tags{"batch": batchRef},
2397 Prefix: dc.srv.prefix(),
2398 Command: "BOUNCER",
2399 Params: []string{"NETWORK", idStr, attrs.String()},
2400 })
2401 })
2402 })
2403 case "ADDNETWORK":
2404 var attrsStr string
2405 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2406 return err
2407 }
2408 attrs := irc.ParseTags(attrsStr)
2409
2410 record := &Network{Nick: dc.nick, Enabled: true}
2411 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2412 return err
2413 }
2414
2415 if record.Realname == dc.user.Realname {
2416 record.Realname = ""
2417 }
2418
2419 network, err := dc.user.createNetwork(record)
2420 if err != nil {
2421 return ircError{&irc.Message{
2422 Command: "FAIL",
2423 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2424 }}
2425 }
2426
2427 dc.SendMessage(&irc.Message{
2428 Prefix: dc.srv.prefix(),
2429 Command: "BOUNCER",
2430 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2431 })
2432 case "CHANGENETWORK":
2433 var idStr, attrsStr string
2434 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2435 return err
2436 }
2437 id, err := parseBouncerNetID(subcommand, idStr)
2438 if err != nil {
2439 return err
2440 }
2441 attrs := irc.ParseTags(attrsStr)
2442
2443 net := dc.user.getNetworkByID(id)
2444 if net == nil {
2445 return ircError{&irc.Message{
2446 Command: "FAIL",
2447 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2448 }}
2449 }
2450
2451 record := net.Network // copy network record because we'll mutate it
2452 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2453 return err
2454 }
2455
2456 if record.Realname == dc.user.Realname {
2457 record.Realname = ""
2458 }
2459
2460 _, err = dc.user.updateNetwork(&record)
2461 if err != nil {
2462 return ircError{&irc.Message{
2463 Command: "FAIL",
2464 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2465 }}
2466 }
2467
2468 dc.SendMessage(&irc.Message{
2469 Prefix: dc.srv.prefix(),
2470 Command: "BOUNCER",
2471 Params: []string{"CHANGENETWORK", idStr},
2472 })
2473 case "DELNETWORK":
2474 var idStr string
2475 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2476 return err
2477 }
2478 id, err := parseBouncerNetID(subcommand, idStr)
2479 if err != nil {
2480 return err
2481 }
2482
2483 net := dc.user.getNetworkByID(id)
2484 if net == nil {
2485 return ircError{&irc.Message{
2486 Command: "FAIL",
2487 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2488 }}
2489 }
2490
2491 if err := dc.user.deleteNetwork(net.ID); err != nil {
2492 return err
2493 }
2494
2495 dc.SendMessage(&irc.Message{
2496 Prefix: dc.srv.prefix(),
2497 Command: "BOUNCER",
2498 Params: []string{"DELNETWORK", idStr},
2499 })
2500 default:
2501 return ircError{&irc.Message{
2502 Command: "FAIL",
2503 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2504 }}
2505 }
2506 default:
2507 dc.logger.Printf("unhandled message: %v", msg)
2508
2509 // Only forward unknown commands in single-upstream mode
2510 uc := dc.upstream()
2511 if uc == nil {
2512 return newUnknownCommandError(msg.Command)
2513 }
2514
2515 uc.SendMessageLabeled(dc.id, msg)
2516 }
2517 return nil
2518}
2519
2520func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2521 username, password, ok := parseNickServCredentials(text, uc.nick)
2522 if !ok {
2523 return
2524 }
2525
2526 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2527 // automatically erase the key pair or any other credentials.
2528 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2529 return
2530 }
2531
2532 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2533 n := uc.network
2534 n.SASL.Mechanism = "PLAIN"
2535 n.SASL.Plain.Username = username
2536 n.SASL.Plain.Password = password
2537 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
2538 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2539 }
2540}
2541
2542func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2543 fields := strings.Fields(text)
2544 if len(fields) < 2 {
2545 return "", "", false
2546 }
2547 cmd := strings.ToUpper(fields[0])
2548 params := fields[1:]
2549 switch cmd {
2550 case "REGISTER":
2551 username = nick
2552 password = params[0]
2553 case "IDENTIFY":
2554 if len(params) == 1 {
2555 username = nick
2556 password = params[0]
2557 } else {
2558 username = params[0]
2559 password = params[1]
2560 }
2561 case "SET":
2562 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2563 username = nick
2564 password = params[1]
2565 }
2566 default:
2567 return "", "", false
2568 }
2569 return username, password, true
2570}
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