source: code/trunk/downstream.go@ 664

Last change on this file since 664 was 664, checked in by contact, 4 years ago

Make Network.Nick optional

Make Network.Nick optional, default to the user's username. This
will allow adding a global setting to set the nickname in the
future, just like we have for the real name.

References: ​https://todo.sr.ht/~emersion/soju/110
File size: 64.8 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(GetNick(&network.user.User, &network.Network)),
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(GetNick(&net.user.User, &net.Network))
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 if dc.network == nil && dc.srv.Title != "" {
1161 isupport = append(isupport, "NETWORK="+encodeISUPPORT(dc.srv.Title))
1162 }
1163 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
1164 isupport = append(isupport, "WHOX")
1165 }
1166
1167 if uc := dc.upstream(); uc != nil {
1168 for k := range passthroughIsupport {
1169 v, ok := uc.isupport[k]
1170 if !ok {
1171 continue
1172 }
1173 if v != nil {
1174 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1175 } else {
1176 isupport = append(isupport, k)
1177 }
1178 }
1179 }
1180
1181 dc.SendMessage(&irc.Message{
1182 Prefix: dc.srv.prefix(),
1183 Command: irc.RPL_WELCOME,
1184 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1185 })
1186 dc.SendMessage(&irc.Message{
1187 Prefix: dc.srv.prefix(),
1188 Command: irc.RPL_YOURHOST,
1189 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1190 })
1191 dc.SendMessage(&irc.Message{
1192 Prefix: dc.srv.prefix(),
1193 Command: irc.RPL_MYINFO,
1194 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1195 })
1196 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1197 dc.SendMessage(msg)
1198 }
1199 if uc := dc.upstream(); uc != nil {
1200 dc.SendMessage(&irc.Message{
1201 Prefix: dc.srv.prefix(),
1202 Command: irc.RPL_UMODEIS,
1203 Params: []string{dc.nick, string(uc.modes)},
1204 })
1205 }
1206
1207 if motd := dc.user.srv.MOTD(); motd != "" && dc.network == nil {
1208 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1209 dc.SendMessage(msg)
1210 }
1211 } else {
1212 motdHint := "No MOTD"
1213 if dc.network != nil {
1214 motdHint = "Use /motd to read the message of the day"
1215 }
1216 dc.SendMessage(&irc.Message{
1217 Prefix: dc.srv.prefix(),
1218 Command: irc.ERR_NOMOTD,
1219 Params: []string{dc.nick, motdHint},
1220 })
1221 }
1222
1223 dc.updateNick()
1224 dc.updateRealname()
1225 dc.updateSupportedCaps()
1226
1227 if dc.caps["soju.im/bouncer-networks-notify"] {
1228 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1229 dc.user.forEachNetwork(func(network *network) {
1230 idStr := fmt.Sprintf("%v", network.ID)
1231 attrs := getNetworkAttrs(network)
1232 dc.SendMessage(&irc.Message{
1233 Tags: irc.Tags{"batch": batchRef},
1234 Prefix: dc.srv.prefix(),
1235 Command: "BOUNCER",
1236 Params: []string{"NETWORK", idStr, attrs.String()},
1237 })
1238 })
1239 })
1240 }
1241
1242 dc.forEachUpstream(func(uc *upstreamConn) {
1243 for _, entry := range uc.channels.innerMap {
1244 ch := entry.value.(*upstreamChannel)
1245 if !ch.complete {
1246 continue
1247 }
1248 record := uc.network.channels.Value(ch.Name)
1249 if record != nil && record.Detached {
1250 continue
1251 }
1252
1253 dc.SendMessage(&irc.Message{
1254 Prefix: dc.prefix(),
1255 Command: "JOIN",
1256 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1257 })
1258
1259 forwardChannel(dc, ch)
1260 }
1261 })
1262
1263 dc.forEachNetwork(func(net *network) {
1264 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1265 return
1266 }
1267
1268 // Only send history if we're the first connected client with that name
1269 // for the network
1270 firstClient := true
1271 dc.user.forEachDownstream(func(c *downstreamConn) {
1272 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1273 firstClient = false
1274 }
1275 })
1276 if firstClient {
1277 net.delivered.ForEachTarget(func(target string) {
1278 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1279 if lastDelivered == "" {
1280 return
1281 }
1282
1283 dc.sendTargetBacklog(net, target, lastDelivered)
1284
1285 // Fast-forward history to last message
1286 targetCM := net.casemap(target)
1287 lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
1288 if err != nil {
1289 dc.logger.Printf("failed to get last message ID: %v", err)
1290 return
1291 }
1292 net.delivered.StoreID(target, dc.clientName, lastID)
1293 })
1294 }
1295 })
1296
1297 return nil
1298}
1299
1300// messageSupportsHistory checks whether the provided message can be sent as
1301// part of an history batch.
1302func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
1303 // Don't replay all messages, because that would mess up client
1304 // state. For instance we just sent the list of users, sending
1305 // PART messages for one of these users would be incorrect.
1306 // TODO: add support for draft/event-playback
1307 switch msg.Command {
1308 case "PRIVMSG", "NOTICE":
1309 return true
1310 }
1311 return false
1312}
1313
1314func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1315 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1316 return
1317 }
1318
1319 ch := net.channels.Value(target)
1320
1321 limit := 4000
1322 targetCM := net.casemap(target)
1323 history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
1324 if err != nil {
1325 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1326 return
1327 }
1328
1329 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1330 for _, msg := range history {
1331 if !dc.messageSupportsHistory(msg) {
1332 continue
1333 }
1334
1335 if ch != nil && ch.Detached {
1336 if net.detachedMessageNeedsRelay(ch, msg) {
1337 dc.relayDetachedMessage(net, msg)
1338 }
1339 } else {
1340 msg.Tags["batch"] = batchRef
1341 dc.SendMessage(dc.marshalMessage(msg, net))
1342 }
1343 }
1344 })
1345}
1346
1347func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1348 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1349 return
1350 }
1351
1352 sender := msg.Prefix.Name
1353 target, text := msg.Params[0], msg.Params[1]
1354 if net.isHighlight(msg) {
1355 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1356 } else {
1357 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1358 }
1359}
1360
1361func (dc *downstreamConn) runUntilRegistered() error {
1362 for !dc.registered {
1363 msg, err := dc.ReadMessage()
1364 if err != nil {
1365 return fmt.Errorf("failed to read IRC command: %w", err)
1366 }
1367
1368 err = dc.handleMessage(msg)
1369 if ircErr, ok := err.(ircError); ok {
1370 ircErr.Message.Prefix = dc.srv.prefix()
1371 dc.SendMessage(ircErr.Message)
1372 } else if err != nil {
1373 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1374 }
1375 }
1376
1377 return nil
1378}
1379
1380func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1381 switch msg.Command {
1382 case "CAP":
1383 var subCmd string
1384 if err := parseMessageParams(msg, &subCmd); err != nil {
1385 return err
1386 }
1387 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1388 return err
1389 }
1390 case "PING":
1391 var source, destination string
1392 if err := parseMessageParams(msg, &source); err != nil {
1393 return err
1394 }
1395 if len(msg.Params) > 1 {
1396 destination = msg.Params[1]
1397 }
1398 if destination != "" && destination != dc.srv.Hostname {
1399 return ircError{&irc.Message{
1400 Command: irc.ERR_NOSUCHSERVER,
1401 Params: []string{dc.nick, destination, "No such server"},
1402 }}
1403 }
1404 dc.SendMessage(&irc.Message{
1405 Prefix: dc.srv.prefix(),
1406 Command: "PONG",
1407 Params: []string{dc.srv.Hostname, source},
1408 })
1409 return nil
1410 case "PONG":
1411 if len(msg.Params) == 0 {
1412 return newNeedMoreParamsError(msg.Command)
1413 }
1414 token := msg.Params[len(msg.Params)-1]
1415 dc.handlePong(token)
1416 case "USER":
1417 return ircError{&irc.Message{
1418 Command: irc.ERR_ALREADYREGISTERED,
1419 Params: []string{dc.nick, "You may not reregister"},
1420 }}
1421 case "NICK":
1422 var rawNick string
1423 if err := parseMessageParams(msg, &rawNick); err != nil {
1424 return err
1425 }
1426
1427 nick := rawNick
1428 var upstream *upstreamConn
1429 if dc.upstream() == nil {
1430 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1431 if err == nil { // NICK nick/network: NICK only on a specific upstream
1432 upstream = uc
1433 nick = unmarshaledNick
1434 }
1435 }
1436
1437 if strings.ContainsAny(nick, illegalNickChars) {
1438 return ircError{&irc.Message{
1439 Command: irc.ERR_ERRONEUSNICKNAME,
1440 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1441 }}
1442 }
1443 if casemapASCII(nick) == serviceNickCM {
1444 return ircError{&irc.Message{
1445 Command: irc.ERR_NICKNAMEINUSE,
1446 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1447 }}
1448 }
1449
1450 var err error
1451 dc.forEachNetwork(func(n *network) {
1452 if err != nil || (upstream != nil && upstream.network != n) {
1453 return
1454 }
1455 n.Nick = nick
1456 err = dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network)
1457 })
1458 if err != nil {
1459 return err
1460 }
1461
1462 dc.forEachUpstream(func(uc *upstreamConn) {
1463 if upstream != nil && upstream != uc {
1464 return
1465 }
1466 uc.SendMessageLabeled(dc.id, &irc.Message{
1467 Command: "NICK",
1468 Params: []string{nick},
1469 })
1470 })
1471
1472 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1473 dc.SendMessage(&irc.Message{
1474 Prefix: dc.prefix(),
1475 Command: "NICK",
1476 Params: []string{nick},
1477 })
1478 dc.nick = nick
1479 dc.nickCM = casemapASCII(dc.nick)
1480 }
1481 case "SETNAME":
1482 var realname string
1483 if err := parseMessageParams(msg, &realname); err != nil {
1484 return err
1485 }
1486
1487 // If the client just resets to the default, just wipe the per-network
1488 // preference
1489 storeRealname := realname
1490 if realname == dc.user.Realname {
1491 storeRealname = ""
1492 }
1493
1494 var storeErr error
1495 var needUpdate []Network
1496 dc.forEachNetwork(func(n *network) {
1497 // We only need to call updateNetwork for upstreams that don't
1498 // support setname
1499 if uc := n.conn; uc != nil && uc.caps["setname"] {
1500 uc.SendMessageLabeled(dc.id, &irc.Message{
1501 Command: "SETNAME",
1502 Params: []string{realname},
1503 })
1504
1505 n.Realname = storeRealname
1506 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
1507 dc.logger.Printf("failed to store network realname: %v", err)
1508 storeErr = err
1509 }
1510 return
1511 }
1512
1513 record := n.Network // copy network record because we'll mutate it
1514 record.Realname = storeRealname
1515 needUpdate = append(needUpdate, record)
1516 })
1517
1518 // Walk the network list as a second step, because updateNetwork
1519 // mutates the original list
1520 for _, record := range needUpdate {
1521 if _, err := dc.user.updateNetwork(&record); err != nil {
1522 dc.logger.Printf("failed to update network realname: %v", err)
1523 storeErr = err
1524 }
1525 }
1526 if storeErr != nil {
1527 return ircError{&irc.Message{
1528 Command: "FAIL",
1529 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1530 }}
1531 }
1532
1533 if dc.upstream() == nil {
1534 dc.SendMessage(&irc.Message{
1535 Prefix: dc.prefix(),
1536 Command: "SETNAME",
1537 Params: []string{realname},
1538 })
1539 }
1540 case "JOIN":
1541 var namesStr string
1542 if err := parseMessageParams(msg, &namesStr); err != nil {
1543 return err
1544 }
1545
1546 var keys []string
1547 if len(msg.Params) > 1 {
1548 keys = strings.Split(msg.Params[1], ",")
1549 }
1550
1551 for i, name := range strings.Split(namesStr, ",") {
1552 uc, upstreamName, err := dc.unmarshalEntity(name)
1553 if err != nil {
1554 return err
1555 }
1556
1557 var key string
1558 if len(keys) > i {
1559 key = keys[i]
1560 }
1561
1562 if !uc.isChannel(upstreamName) {
1563 dc.SendMessage(&irc.Message{
1564 Prefix: dc.srv.prefix(),
1565 Command: irc.ERR_NOSUCHCHANNEL,
1566 Params: []string{name, "Not a channel name"},
1567 })
1568 continue
1569 }
1570
1571 params := []string{upstreamName}
1572 if key != "" {
1573 params = append(params, key)
1574 }
1575 uc.SendMessageLabeled(dc.id, &irc.Message{
1576 Command: "JOIN",
1577 Params: params,
1578 })
1579
1580 ch := uc.network.channels.Value(upstreamName)
1581 if ch != nil {
1582 // Don't clear the channel key if there's one set
1583 // TODO: add a way to unset the channel key
1584 if key != "" {
1585 ch.Key = key
1586 }
1587 uc.network.attach(ch)
1588 } else {
1589 ch = &Channel{
1590 Name: upstreamName,
1591 Key: key,
1592 }
1593 uc.network.channels.SetValue(upstreamName, ch)
1594 }
1595 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1596 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1597 }
1598 }
1599 case "PART":
1600 var namesStr string
1601 if err := parseMessageParams(msg, &namesStr); err != nil {
1602 return err
1603 }
1604
1605 var reason string
1606 if len(msg.Params) > 1 {
1607 reason = msg.Params[1]
1608 }
1609
1610 for _, name := range strings.Split(namesStr, ",") {
1611 uc, upstreamName, err := dc.unmarshalEntity(name)
1612 if err != nil {
1613 return err
1614 }
1615
1616 if strings.EqualFold(reason, "detach") {
1617 ch := uc.network.channels.Value(upstreamName)
1618 if ch != nil {
1619 uc.network.detach(ch)
1620 } else {
1621 ch = &Channel{
1622 Name: name,
1623 Detached: true,
1624 }
1625 uc.network.channels.SetValue(upstreamName, ch)
1626 }
1627 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1628 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1629 }
1630 } else {
1631 params := []string{upstreamName}
1632 if reason != "" {
1633 params = append(params, reason)
1634 }
1635 uc.SendMessageLabeled(dc.id, &irc.Message{
1636 Command: "PART",
1637 Params: params,
1638 })
1639
1640 if err := uc.network.deleteChannel(upstreamName); err != nil {
1641 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1642 }
1643 }
1644 }
1645 case "KICK":
1646 var channelStr, userStr string
1647 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1648 return err
1649 }
1650
1651 channels := strings.Split(channelStr, ",")
1652 users := strings.Split(userStr, ",")
1653
1654 var reason string
1655 if len(msg.Params) > 2 {
1656 reason = msg.Params[2]
1657 }
1658
1659 if len(channels) != 1 && len(channels) != len(users) {
1660 return ircError{&irc.Message{
1661 Command: irc.ERR_BADCHANMASK,
1662 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1663 }}
1664 }
1665
1666 for i, user := range users {
1667 var channel string
1668 if len(channels) == 1 {
1669 channel = channels[0]
1670 } else {
1671 channel = channels[i]
1672 }
1673
1674 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1675 if err != nil {
1676 return err
1677 }
1678
1679 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1680 if err != nil {
1681 return err
1682 }
1683
1684 if ucChannel != ucUser {
1685 return ircError{&irc.Message{
1686 Command: irc.ERR_USERNOTINCHANNEL,
1687 Params: []string{dc.nick, user, channel, "They are on another network"},
1688 }}
1689 }
1690 uc := ucChannel
1691
1692 params := []string{upstreamChannel, upstreamUser}
1693 if reason != "" {
1694 params = append(params, reason)
1695 }
1696 uc.SendMessageLabeled(dc.id, &irc.Message{
1697 Command: "KICK",
1698 Params: params,
1699 })
1700 }
1701 case "MODE":
1702 var name string
1703 if err := parseMessageParams(msg, &name); err != nil {
1704 return err
1705 }
1706
1707 var modeStr string
1708 if len(msg.Params) > 1 {
1709 modeStr = msg.Params[1]
1710 }
1711
1712 if casemapASCII(name) == dc.nickCM {
1713 if modeStr != "" {
1714 if uc := dc.upstream(); uc != nil {
1715 uc.SendMessageLabeled(dc.id, &irc.Message{
1716 Command: "MODE",
1717 Params: []string{uc.nick, modeStr},
1718 })
1719 } else {
1720 dc.SendMessage(&irc.Message{
1721 Prefix: dc.srv.prefix(),
1722 Command: irc.ERR_UMODEUNKNOWNFLAG,
1723 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1724 })
1725 }
1726 } else {
1727 var userMode string
1728 if uc := dc.upstream(); uc != nil {
1729 userMode = string(uc.modes)
1730 }
1731
1732 dc.SendMessage(&irc.Message{
1733 Prefix: dc.srv.prefix(),
1734 Command: irc.RPL_UMODEIS,
1735 Params: []string{dc.nick, userMode},
1736 })
1737 }
1738 return nil
1739 }
1740
1741 uc, upstreamName, err := dc.unmarshalEntity(name)
1742 if err != nil {
1743 return err
1744 }
1745
1746 if !uc.isChannel(upstreamName) {
1747 return ircError{&irc.Message{
1748 Command: irc.ERR_USERSDONTMATCH,
1749 Params: []string{dc.nick, "Cannot change mode for other users"},
1750 }}
1751 }
1752
1753 if modeStr != "" {
1754 params := []string{upstreamName, modeStr}
1755 params = append(params, msg.Params[2:]...)
1756 uc.SendMessageLabeled(dc.id, &irc.Message{
1757 Command: "MODE",
1758 Params: params,
1759 })
1760 } else {
1761 ch := uc.channels.Value(upstreamName)
1762 if ch == nil {
1763 return ircError{&irc.Message{
1764 Command: irc.ERR_NOSUCHCHANNEL,
1765 Params: []string{dc.nick, name, "No such channel"},
1766 }}
1767 }
1768
1769 if ch.modes == nil {
1770 // we haven't received the initial RPL_CHANNELMODEIS yet
1771 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1772 return nil
1773 }
1774
1775 modeStr, modeParams := ch.modes.Format()
1776 params := []string{dc.nick, name, modeStr}
1777 params = append(params, modeParams...)
1778
1779 dc.SendMessage(&irc.Message{
1780 Prefix: dc.srv.prefix(),
1781 Command: irc.RPL_CHANNELMODEIS,
1782 Params: params,
1783 })
1784 if ch.creationTime != "" {
1785 dc.SendMessage(&irc.Message{
1786 Prefix: dc.srv.prefix(),
1787 Command: rpl_creationtime,
1788 Params: []string{dc.nick, name, ch.creationTime},
1789 })
1790 }
1791 }
1792 case "TOPIC":
1793 var channel string
1794 if err := parseMessageParams(msg, &channel); err != nil {
1795 return err
1796 }
1797
1798 uc, upstreamName, err := dc.unmarshalEntity(channel)
1799 if err != nil {
1800 return err
1801 }
1802
1803 if len(msg.Params) > 1 { // setting topic
1804 topic := msg.Params[1]
1805 uc.SendMessageLabeled(dc.id, &irc.Message{
1806 Command: "TOPIC",
1807 Params: []string{upstreamName, topic},
1808 })
1809 } else { // getting topic
1810 ch := uc.channels.Value(upstreamName)
1811 if ch == nil {
1812 return ircError{&irc.Message{
1813 Command: irc.ERR_NOSUCHCHANNEL,
1814 Params: []string{dc.nick, upstreamName, "No such channel"},
1815 }}
1816 }
1817 sendTopic(dc, ch)
1818 }
1819 case "LIST":
1820 // TODO: support ELIST when supported by all upstreams
1821
1822 pl := pendingLIST{
1823 downstreamID: dc.id,
1824 pendingCommands: make(map[int64]*irc.Message),
1825 }
1826 var upstream *upstreamConn
1827 var upstreamChannels map[int64][]string
1828 if len(msg.Params) > 0 {
1829 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1830 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1831 upstream = uc
1832 } else {
1833 upstreamChannels = make(map[int64][]string)
1834 channels := strings.Split(msg.Params[0], ",")
1835 for _, channel := range channels {
1836 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1837 if err != nil {
1838 return err
1839 }
1840 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1841 }
1842 }
1843 }
1844
1845 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1846 dc.forEachUpstream(func(uc *upstreamConn) {
1847 if upstream != nil && upstream != uc {
1848 return
1849 }
1850 var params []string
1851 if upstreamChannels != nil {
1852 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1853 params = []string{strings.Join(channels, ",")}
1854 } else {
1855 return
1856 }
1857 }
1858 pl.pendingCommands[uc.network.ID] = &irc.Message{
1859 Command: "LIST",
1860 Params: params,
1861 }
1862 uc.trySendLIST(dc.id)
1863 })
1864 case "NAMES":
1865 if len(msg.Params) == 0 {
1866 dc.SendMessage(&irc.Message{
1867 Prefix: dc.srv.prefix(),
1868 Command: irc.RPL_ENDOFNAMES,
1869 Params: []string{dc.nick, "*", "End of /NAMES list"},
1870 })
1871 return nil
1872 }
1873
1874 channels := strings.Split(msg.Params[0], ",")
1875 for _, channel := range channels {
1876 uc, upstreamName, err := dc.unmarshalEntity(channel)
1877 if err != nil {
1878 return err
1879 }
1880
1881 ch := uc.channels.Value(upstreamName)
1882 if ch != nil {
1883 sendNames(dc, ch)
1884 } else {
1885 // NAMES on a channel we have not joined, ask upstream
1886 uc.SendMessageLabeled(dc.id, &irc.Message{
1887 Command: "NAMES",
1888 Params: []string{upstreamName},
1889 })
1890 }
1891 }
1892 // For WHOX docs, see:
1893 // - http://faerion.sourceforge.net/doc/irc/whox.var
1894 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1895 // Note, many features aren't widely implemented, such as flags and mask2
1896 case "WHO":
1897 if len(msg.Params) == 0 {
1898 // TODO: support WHO without parameters
1899 dc.SendMessage(&irc.Message{
1900 Prefix: dc.srv.prefix(),
1901 Command: irc.RPL_ENDOFWHO,
1902 Params: []string{dc.nick, "*", "End of /WHO list"},
1903 })
1904 return nil
1905 }
1906
1907 // Clients will use the first mask to match RPL_ENDOFWHO
1908 endOfWhoToken := msg.Params[0]
1909
1910 // TODO: add support for WHOX mask2
1911 mask := msg.Params[0]
1912 var options string
1913 if len(msg.Params) > 1 {
1914 options = msg.Params[1]
1915 }
1916
1917 optionsParts := strings.SplitN(options, "%", 2)
1918 // TODO: add support for WHOX flags in optionsParts[0]
1919 var fields, whoxToken string
1920 if len(optionsParts) == 2 {
1921 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1922 fields = strings.ToLower(optionsParts[0])
1923 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1924 whoxToken = optionsParts[1]
1925 }
1926 }
1927
1928 // TODO: support mixed bouncer/upstream WHO queries
1929 maskCM := casemapASCII(mask)
1930 if dc.network == nil && maskCM == dc.nickCM {
1931 // TODO: support AWAY (H/G) in self WHO reply
1932 flags := "H"
1933 if dc.user.Admin {
1934 flags += "*"
1935 }
1936 info := whoxInfo{
1937 Token: whoxToken,
1938 Username: dc.user.Username,
1939 Hostname: dc.hostname,
1940 Server: dc.srv.Hostname,
1941 Nickname: dc.nick,
1942 Flags: flags,
1943 Account: dc.user.Username,
1944 Realname: dc.realname,
1945 }
1946 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1947 dc.SendMessage(&irc.Message{
1948 Prefix: dc.srv.prefix(),
1949 Command: irc.RPL_ENDOFWHO,
1950 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1951 })
1952 return nil
1953 }
1954 if maskCM == serviceNickCM {
1955 info := whoxInfo{
1956 Token: whoxToken,
1957 Username: servicePrefix.User,
1958 Hostname: servicePrefix.Host,
1959 Server: dc.srv.Hostname,
1960 Nickname: serviceNick,
1961 Flags: "H*",
1962 Account: serviceNick,
1963 Realname: serviceRealname,
1964 }
1965 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1966 dc.SendMessage(&irc.Message{
1967 Prefix: dc.srv.prefix(),
1968 Command: irc.RPL_ENDOFWHO,
1969 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1970 })
1971 return nil
1972 }
1973
1974 // TODO: properly support WHO masks
1975 uc, upstreamMask, err := dc.unmarshalEntity(mask)
1976 if err != nil {
1977 return err
1978 }
1979
1980 params := []string{upstreamMask}
1981 if options != "" {
1982 params = append(params, options)
1983 }
1984
1985 uc.SendMessageLabeled(dc.id, &irc.Message{
1986 Command: "WHO",
1987 Params: params,
1988 })
1989 case "WHOIS":
1990 if len(msg.Params) == 0 {
1991 return ircError{&irc.Message{
1992 Command: irc.ERR_NONICKNAMEGIVEN,
1993 Params: []string{dc.nick, "No nickname given"},
1994 }}
1995 }
1996
1997 var target, mask string
1998 if len(msg.Params) == 1 {
1999 target = ""
2000 mask = msg.Params[0]
2001 } else {
2002 target = msg.Params[0]
2003 mask = msg.Params[1]
2004 }
2005 // TODO: support multiple WHOIS users
2006 if i := strings.IndexByte(mask, ','); i >= 0 {
2007 mask = mask[:i]
2008 }
2009
2010 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2011 dc.SendMessage(&irc.Message{
2012 Prefix: dc.srv.prefix(),
2013 Command: irc.RPL_WHOISUSER,
2014 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2015 })
2016 dc.SendMessage(&irc.Message{
2017 Prefix: dc.srv.prefix(),
2018 Command: irc.RPL_WHOISSERVER,
2019 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
2020 })
2021 if dc.user.Admin {
2022 dc.SendMessage(&irc.Message{
2023 Prefix: dc.srv.prefix(),
2024 Command: irc.RPL_WHOISOPERATOR,
2025 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2026 })
2027 }
2028 dc.SendMessage(&irc.Message{
2029 Prefix: dc.srv.prefix(),
2030 Command: rpl_whoisaccount,
2031 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2032 })
2033 dc.SendMessage(&irc.Message{
2034 Prefix: dc.srv.prefix(),
2035 Command: irc.RPL_ENDOFWHOIS,
2036 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2037 })
2038 return nil
2039 }
2040 if casemapASCII(mask) == serviceNickCM {
2041 dc.SendMessage(&irc.Message{
2042 Prefix: dc.srv.prefix(),
2043 Command: irc.RPL_WHOISUSER,
2044 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2045 })
2046 dc.SendMessage(&irc.Message{
2047 Prefix: dc.srv.prefix(),
2048 Command: irc.RPL_WHOISSERVER,
2049 Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
2050 })
2051 dc.SendMessage(&irc.Message{
2052 Prefix: dc.srv.prefix(),
2053 Command: irc.RPL_WHOISOPERATOR,
2054 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2055 })
2056 dc.SendMessage(&irc.Message{
2057 Prefix: dc.srv.prefix(),
2058 Command: rpl_whoisaccount,
2059 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2060 })
2061 dc.SendMessage(&irc.Message{
2062 Prefix: dc.srv.prefix(),
2063 Command: irc.RPL_ENDOFWHOIS,
2064 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2065 })
2066 return nil
2067 }
2068
2069 // TODO: support WHOIS masks
2070 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2071 if err != nil {
2072 return err
2073 }
2074
2075 var params []string
2076 if target != "" {
2077 if target == mask { // WHOIS nick nick
2078 params = []string{upstreamNick, upstreamNick}
2079 } else {
2080 params = []string{target, upstreamNick}
2081 }
2082 } else {
2083 params = []string{upstreamNick}
2084 }
2085
2086 uc.SendMessageLabeled(dc.id, &irc.Message{
2087 Command: "WHOIS",
2088 Params: params,
2089 })
2090 case "PRIVMSG", "NOTICE":
2091 var targetsStr, text string
2092 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2093 return err
2094 }
2095 tags := copyClientTags(msg.Tags)
2096
2097 for _, name := range strings.Split(targetsStr, ",") {
2098 if name == "$"+dc.srv.Hostname || (name == "$*" && dc.network == nil) {
2099 // "$" means a server mask follows. If it's the bouncer's
2100 // hostname, broadcast the message to all bouncer users.
2101 if !dc.user.Admin {
2102 return ircError{&irc.Message{
2103 Prefix: dc.srv.prefix(),
2104 Command: irc.ERR_BADMASK,
2105 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2106 }}
2107 }
2108
2109 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2110
2111 broadcastTags := tags.Copy()
2112 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2113 broadcastMsg := &irc.Message{
2114 Tags: broadcastTags,
2115 Prefix: servicePrefix,
2116 Command: msg.Command,
2117 Params: []string{name, text},
2118 }
2119 dc.srv.forEachUser(func(u *user) {
2120 u.events <- eventBroadcast{broadcastMsg}
2121 })
2122 continue
2123 }
2124
2125 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2126 dc.SendMessage(&irc.Message{
2127 Tags: msg.Tags.Copy(),
2128 Prefix: dc.prefix(),
2129 Command: msg.Command,
2130 Params: []string{name, text},
2131 })
2132 continue
2133 }
2134
2135 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2136 if dc.caps["echo-message"] {
2137 echoTags := tags.Copy()
2138 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2139 dc.SendMessage(&irc.Message{
2140 Tags: echoTags,
2141 Prefix: dc.prefix(),
2142 Command: msg.Command,
2143 Params: []string{name, text},
2144 })
2145 }
2146 handleServicePRIVMSG(dc, text)
2147 continue
2148 }
2149
2150 uc, upstreamName, err := dc.unmarshalEntity(name)
2151 if err != nil {
2152 return err
2153 }
2154
2155 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2156 dc.handleNickServPRIVMSG(uc, text)
2157 }
2158
2159 unmarshaledText := text
2160 if uc.isChannel(upstreamName) {
2161 unmarshaledText = dc.unmarshalText(uc, text)
2162 }
2163 uc.SendMessageLabeled(dc.id, &irc.Message{
2164 Tags: tags,
2165 Command: msg.Command,
2166 Params: []string{upstreamName, unmarshaledText},
2167 })
2168
2169 echoTags := tags.Copy()
2170 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2171 if uc.account != "" {
2172 echoTags["account"] = irc.TagValue(uc.account)
2173 }
2174 echoMsg := &irc.Message{
2175 Tags: echoTags,
2176 Prefix: &irc.Prefix{
2177 Name: uc.nick,
2178 User: uc.username,
2179 },
2180 Command: msg.Command,
2181 Params: []string{upstreamName, text},
2182 }
2183 uc.produce(upstreamName, echoMsg, dc)
2184
2185 uc.updateChannelAutoDetach(upstreamName)
2186 }
2187 case "TAGMSG":
2188 var targetsStr string
2189 if err := parseMessageParams(msg, &targetsStr); err != nil {
2190 return err
2191 }
2192 tags := copyClientTags(msg.Tags)
2193
2194 for _, name := range strings.Split(targetsStr, ",") {
2195 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2196 dc.SendMessage(&irc.Message{
2197 Tags: msg.Tags.Copy(),
2198 Prefix: dc.prefix(),
2199 Command: "TAGMSG",
2200 Params: []string{name},
2201 })
2202 continue
2203 }
2204
2205 if casemapASCII(name) == serviceNickCM {
2206 continue
2207 }
2208
2209 uc, upstreamName, err := dc.unmarshalEntity(name)
2210 if err != nil {
2211 return err
2212 }
2213 if _, ok := uc.caps["message-tags"]; !ok {
2214 continue
2215 }
2216
2217 uc.SendMessageLabeled(dc.id, &irc.Message{
2218 Tags: tags,
2219 Command: "TAGMSG",
2220 Params: []string{upstreamName},
2221 })
2222
2223 uc.updateChannelAutoDetach(upstreamName)
2224 }
2225 case "INVITE":
2226 var user, channel string
2227 if err := parseMessageParams(msg, &user, &channel); err != nil {
2228 return err
2229 }
2230
2231 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2232 if err != nil {
2233 return err
2234 }
2235
2236 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2237 if err != nil {
2238 return err
2239 }
2240
2241 if ucChannel != ucUser {
2242 return ircError{&irc.Message{
2243 Command: irc.ERR_USERNOTINCHANNEL,
2244 Params: []string{dc.nick, user, channel, "They are on another network"},
2245 }}
2246 }
2247 uc := ucChannel
2248
2249 uc.SendMessageLabeled(dc.id, &irc.Message{
2250 Command: "INVITE",
2251 Params: []string{upstreamUser, upstreamChannel},
2252 })
2253 case "CHATHISTORY":
2254 var subcommand string
2255 if err := parseMessageParams(msg, &subcommand); err != nil {
2256 return err
2257 }
2258 var target, limitStr string
2259 var boundsStr [2]string
2260 switch subcommand {
2261 case "AFTER", "BEFORE":
2262 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2263 return err
2264 }
2265 case "BETWEEN":
2266 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2267 return err
2268 }
2269 case "TARGETS":
2270 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2271 return err
2272 }
2273 default:
2274 // TODO: support LATEST, AROUND
2275 return ircError{&irc.Message{
2276 Command: "FAIL",
2277 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2278 }}
2279 }
2280
2281 // We don't save history for our service
2282 if casemapASCII(target) == serviceNickCM {
2283 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2284 return nil
2285 }
2286
2287 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2288 if !ok {
2289 return ircError{&irc.Message{
2290 Command: irc.ERR_UNKNOWNCOMMAND,
2291 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2292 }}
2293 }
2294
2295 network, entity, err := dc.unmarshalEntityNetwork(target)
2296 if err != nil {
2297 return err
2298 }
2299 entity = network.casemap(entity)
2300
2301 // TODO: support msgid criteria
2302 var bounds [2]time.Time
2303 bounds[0] = parseChatHistoryBound(boundsStr[0])
2304 if bounds[0].IsZero() {
2305 return ircError{&irc.Message{
2306 Command: "FAIL",
2307 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2308 }}
2309 }
2310
2311 if boundsStr[1] != "" {
2312 bounds[1] = parseChatHistoryBound(boundsStr[1])
2313 if bounds[1].IsZero() {
2314 return ircError{&irc.Message{
2315 Command: "FAIL",
2316 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2317 }}
2318 }
2319 }
2320
2321 limit, err := strconv.Atoi(limitStr)
2322 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
2323 return ircError{&irc.Message{
2324 Command: "FAIL",
2325 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2326 }}
2327 }
2328
2329 var history []*irc.Message
2330 switch subcommand {
2331 case "BEFORE":
2332 history, err = store.LoadBeforeTime(network, entity, bounds[0], time.Time{}, limit)
2333 case "AFTER":
2334 history, err = store.LoadAfterTime(network, entity, bounds[0], time.Now(), limit)
2335 case "BETWEEN":
2336 if bounds[0].Before(bounds[1]) {
2337 history, err = store.LoadAfterTime(network, entity, bounds[0], bounds[1], limit)
2338 } else {
2339 history, err = store.LoadBeforeTime(network, entity, bounds[0], bounds[1], limit)
2340 }
2341 case "TARGETS":
2342 // TODO: support TARGETS in multi-upstream mode
2343 targets, err := store.ListTargets(network, bounds[0], bounds[1], limit)
2344 if err != nil {
2345 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2346 return ircError{&irc.Message{
2347 Command: "FAIL",
2348 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2349 }}
2350 }
2351
2352 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2353 for _, target := range targets {
2354 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2355 continue
2356 }
2357
2358 dc.SendMessage(&irc.Message{
2359 Tags: irc.Tags{"batch": batchRef},
2360 Prefix: dc.srv.prefix(),
2361 Command: "CHATHISTORY",
2362 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2363 })
2364 }
2365 })
2366
2367 return nil
2368 }
2369 if err != nil {
2370 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2371 return newChatHistoryError(subcommand, target)
2372 }
2373
2374 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2375 for _, msg := range history {
2376 msg.Tags["batch"] = batchRef
2377 dc.SendMessage(dc.marshalMessage(msg, network))
2378 }
2379 })
2380 case "BOUNCER":
2381 var subcommand string
2382 if err := parseMessageParams(msg, &subcommand); err != nil {
2383 return err
2384 }
2385
2386 switch strings.ToUpper(subcommand) {
2387 case "BIND":
2388 return ircError{&irc.Message{
2389 Command: "FAIL",
2390 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2391 }}
2392 case "LISTNETWORKS":
2393 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2394 dc.user.forEachNetwork(func(network *network) {
2395 idStr := fmt.Sprintf("%v", network.ID)
2396 attrs := getNetworkAttrs(network)
2397 dc.SendMessage(&irc.Message{
2398 Tags: irc.Tags{"batch": batchRef},
2399 Prefix: dc.srv.prefix(),
2400 Command: "BOUNCER",
2401 Params: []string{"NETWORK", idStr, attrs.String()},
2402 })
2403 })
2404 })
2405 case "ADDNETWORK":
2406 var attrsStr string
2407 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2408 return err
2409 }
2410 attrs := irc.ParseTags(attrsStr)
2411
2412 record := &Network{Nick: dc.nick, Enabled: true}
2413 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2414 return err
2415 }
2416
2417 if record.Nick == dc.user.Username {
2418 record.Nick = ""
2419 }
2420 if record.Realname == dc.user.Realname {
2421 record.Realname = ""
2422 }
2423
2424 network, err := dc.user.createNetwork(record)
2425 if err != nil {
2426 return ircError{&irc.Message{
2427 Command: "FAIL",
2428 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2429 }}
2430 }
2431
2432 dc.SendMessage(&irc.Message{
2433 Prefix: dc.srv.prefix(),
2434 Command: "BOUNCER",
2435 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2436 })
2437 case "CHANGENETWORK":
2438 var idStr, attrsStr string
2439 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2440 return err
2441 }
2442 id, err := parseBouncerNetID(subcommand, idStr)
2443 if err != nil {
2444 return err
2445 }
2446 attrs := irc.ParseTags(attrsStr)
2447
2448 net := dc.user.getNetworkByID(id)
2449 if net == nil {
2450 return ircError{&irc.Message{
2451 Command: "FAIL",
2452 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2453 }}
2454 }
2455
2456 record := net.Network // copy network record because we'll mutate it
2457 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2458 return err
2459 }
2460
2461 if record.Nick == dc.user.Username {
2462 record.Nick = ""
2463 }
2464 if record.Realname == dc.user.Realname {
2465 record.Realname = ""
2466 }
2467
2468 _, err = dc.user.updateNetwork(&record)
2469 if err != nil {
2470 return ircError{&irc.Message{
2471 Command: "FAIL",
2472 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2473 }}
2474 }
2475
2476 dc.SendMessage(&irc.Message{
2477 Prefix: dc.srv.prefix(),
2478 Command: "BOUNCER",
2479 Params: []string{"CHANGENETWORK", idStr},
2480 })
2481 case "DELNETWORK":
2482 var idStr string
2483 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2484 return err
2485 }
2486 id, err := parseBouncerNetID(subcommand, idStr)
2487 if err != nil {
2488 return err
2489 }
2490
2491 net := dc.user.getNetworkByID(id)
2492 if net == nil {
2493 return ircError{&irc.Message{
2494 Command: "FAIL",
2495 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2496 }}
2497 }
2498
2499 if err := dc.user.deleteNetwork(net.ID); err != nil {
2500 return err
2501 }
2502
2503 dc.SendMessage(&irc.Message{
2504 Prefix: dc.srv.prefix(),
2505 Command: "BOUNCER",
2506 Params: []string{"DELNETWORK", idStr},
2507 })
2508 default:
2509 return ircError{&irc.Message{
2510 Command: "FAIL",
2511 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2512 }}
2513 }
2514 default:
2515 dc.logger.Printf("unhandled message: %v", msg)
2516
2517 // Only forward unknown commands in single-upstream mode
2518 uc := dc.upstream()
2519 if uc == nil {
2520 return newUnknownCommandError(msg.Command)
2521 }
2522
2523 uc.SendMessageLabeled(dc.id, msg)
2524 }
2525 return nil
2526}
2527
2528func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2529 username, password, ok := parseNickServCredentials(text, uc.nick)
2530 if !ok {
2531 return
2532 }
2533
2534 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2535 // automatically erase the key pair or any other credentials.
2536 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2537 return
2538 }
2539
2540 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2541 n := uc.network
2542 n.SASL.Mechanism = "PLAIN"
2543 n.SASL.Plain.Username = username
2544 n.SASL.Plain.Password = password
2545 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
2546 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2547 }
2548}
2549
2550func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2551 fields := strings.Fields(text)
2552 if len(fields) < 2 {
2553 return "", "", false
2554 }
2555 cmd := strings.ToUpper(fields[0])
2556 params := fields[1:]
2557 switch cmd {
2558 case "REGISTER":
2559 username = nick
2560 password = params[0]
2561 case "IDENTIFY":
2562 if len(params) == 1 {
2563 username = nick
2564 password = params[0]
2565 } else {
2566 username = params[0]
2567 password = params[1]
2568 }
2569 case "SET":
2570 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2571 username = nick
2572 password = params[1]
2573 }
2574 default:
2575 return "", "", false
2576 }
2577 return username, password, true
2578}
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