source: code/trunk/downstream.go@ 670

Last change on this file since 670 was 670, checked in by contact, 4 years ago

Turn CHATHISTORY and backlog limits into constants
File size: 65.3 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.messageSupportsBacklog(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.messageSupportsBacklog(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 messages which
575// may only appear in single-upstream mode.
576func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
577 if dc.network != nil {
578 return msg
579 }
580
581 msg = msg.Copy()
582 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
583
584 switch msg.Command {
585 case "PRIVMSG", "NOTICE", "TAGMSG":
586 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
587 case "NICK":
588 // Nick change for another user
589 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
590 case "JOIN", "PART":
591 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
592 case "KICK":
593 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
594 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
595 case "TOPIC":
596 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
597 case "QUIT", "SETNAME":
598 // This space is intentionally left blank
599 default:
600 panic(fmt.Sprintf("unexpected %q message", msg.Command))
601 }
602
603 return msg
604}
605
606func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
607 switch msg.Command {
608 case "QUIT":
609 return dc.Close()
610 default:
611 if dc.registered {
612 return dc.handleMessageRegistered(msg)
613 } else {
614 return dc.handleMessageUnregistered(msg)
615 }
616 }
617}
618
619func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
620 switch msg.Command {
621 case "NICK":
622 var nick string
623 if err := parseMessageParams(msg, &nick); err != nil {
624 return err
625 }
626 if strings.ContainsAny(nick, illegalNickChars) {
627 return ircError{&irc.Message{
628 Command: irc.ERR_ERRONEUSNICKNAME,
629 Params: []string{dc.nick, nick, "contains illegal characters"},
630 }}
631 }
632 nickCM := casemapASCII(nick)
633 if nickCM == serviceNickCM {
634 return ircError{&irc.Message{
635 Command: irc.ERR_NICKNAMEINUSE,
636 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
637 }}
638 }
639 dc.nick = nick
640 dc.nickCM = nickCM
641 case "USER":
642 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
643 return err
644 }
645 case "PASS":
646 if err := parseMessageParams(msg, &dc.password); err != nil {
647 return err
648 }
649 case "CAP":
650 var subCmd string
651 if err := parseMessageParams(msg, &subCmd); err != nil {
652 return err
653 }
654 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
655 return err
656 }
657 case "AUTHENTICATE":
658 if !dc.caps["sasl"] {
659 return ircError{&irc.Message{
660 Command: irc.ERR_SASLFAIL,
661 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
662 }}
663 }
664 if len(msg.Params) == 0 {
665 return ircError{&irc.Message{
666 Command: irc.ERR_SASLFAIL,
667 Params: []string{"*", "Missing AUTHENTICATE argument"},
668 }}
669 }
670 if dc.nick == "" {
671 return ircError{&irc.Message{
672 Command: irc.ERR_SASLFAIL,
673 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
674 }}
675 }
676
677 var resp []byte
678 if msg.Params[0] == "*" {
679 dc.saslServer = nil
680 return ircError{&irc.Message{
681 Command: irc.ERR_SASLABORTED,
682 Params: []string{"*", "SASL authentication aborted"},
683 }}
684 } else if dc.saslServer == nil {
685 mech := strings.ToUpper(msg.Params[0])
686 switch mech {
687 case "PLAIN":
688 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
689 return dc.authenticate(username, password)
690 }))
691 default:
692 return ircError{&irc.Message{
693 Command: irc.ERR_SASLFAIL,
694 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
695 }}
696 }
697 } else if msg.Params[0] == "+" {
698 resp = nil
699 } else {
700 // TODO: multi-line messages
701 var err error
702 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
703 if err != nil {
704 dc.saslServer = nil
705 return ircError{&irc.Message{
706 Command: irc.ERR_SASLFAIL,
707 Params: []string{"*", "Invalid base64-encoded response"},
708 }}
709 }
710 }
711
712 challenge, done, err := dc.saslServer.Next(resp)
713 if err != nil {
714 dc.saslServer = nil
715 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
716 return ircError{&irc.Message{
717 Command: irc.ERR_SASLFAIL,
718 Params: []string{"*", ircErr.Message.Params[1]},
719 }}
720 }
721 dc.SendMessage(&irc.Message{
722 Prefix: dc.srv.prefix(),
723 Command: irc.ERR_SASLFAIL,
724 Params: []string{"*", "SASL error"},
725 })
726 return fmt.Errorf("SASL authentication failed: %v", err)
727 } else if done {
728 dc.saslServer = nil
729 dc.SendMessage(&irc.Message{
730 Prefix: dc.srv.prefix(),
731 Command: irc.RPL_LOGGEDIN,
732 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
733 })
734 dc.SendMessage(&irc.Message{
735 Prefix: dc.srv.prefix(),
736 Command: irc.RPL_SASLSUCCESS,
737 Params: []string{dc.nick, "SASL authentication successful"},
738 })
739 } else {
740 challengeStr := "+"
741 if len(challenge) > 0 {
742 challengeStr = base64.StdEncoding.EncodeToString(challenge)
743 }
744
745 // TODO: multi-line messages
746 dc.SendMessage(&irc.Message{
747 Prefix: dc.srv.prefix(),
748 Command: "AUTHENTICATE",
749 Params: []string{challengeStr},
750 })
751 }
752 case "BOUNCER":
753 var subcommand string
754 if err := parseMessageParams(msg, &subcommand); err != nil {
755 return err
756 }
757
758 switch strings.ToUpper(subcommand) {
759 case "BIND":
760 var idStr string
761 if err := parseMessageParams(msg, nil, &idStr); err != nil {
762 return err
763 }
764
765 if dc.user == nil {
766 return ircError{&irc.Message{
767 Command: "FAIL",
768 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
769 }}
770 }
771
772 id, err := parseBouncerNetID(subcommand, idStr)
773 if err != nil {
774 return err
775 }
776
777 var match *network
778 dc.user.forEachNetwork(func(net *network) {
779 if net.ID == id {
780 match = net
781 }
782 })
783 if match == nil {
784 return ircError{&irc.Message{
785 Command: "FAIL",
786 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
787 }}
788 }
789
790 dc.networkName = match.GetName()
791 }
792 default:
793 dc.logger.Printf("unhandled message: %v", msg)
794 return newUnknownCommandError(msg.Command)
795 }
796 if dc.rawUsername != "" && dc.nick != "" && !dc.negotiatingCaps {
797 return dc.register()
798 }
799 return nil
800}
801
802func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
803 cmd = strings.ToUpper(cmd)
804
805 replyTo := dc.nick
806 if !dc.registered {
807 replyTo = "*"
808 }
809
810 switch cmd {
811 case "LS":
812 if len(args) > 0 {
813 var err error
814 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
815 return err
816 }
817 }
818 if !dc.registered && dc.capVersion >= 302 {
819 // Let downstream show everything it supports, and trim
820 // down the available capabilities when upstreams are
821 // known.
822 for k, v := range needAllDownstreamCaps {
823 dc.supportedCaps[k] = v
824 }
825 }
826
827 caps := make([]string, 0, len(dc.supportedCaps))
828 for k, v := range dc.supportedCaps {
829 if dc.capVersion >= 302 && v != "" {
830 caps = append(caps, k+"="+v)
831 } else {
832 caps = append(caps, k)
833 }
834 }
835
836 // TODO: multi-line replies
837 dc.SendMessage(&irc.Message{
838 Prefix: dc.srv.prefix(),
839 Command: "CAP",
840 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
841 })
842
843 if dc.capVersion >= 302 {
844 // CAP version 302 implicitly enables cap-notify
845 dc.caps["cap-notify"] = true
846 }
847
848 if !dc.registered {
849 dc.negotiatingCaps = true
850 }
851 case "LIST":
852 var caps []string
853 for name, enabled := range dc.caps {
854 if enabled {
855 caps = append(caps, name)
856 }
857 }
858
859 // TODO: multi-line replies
860 dc.SendMessage(&irc.Message{
861 Prefix: dc.srv.prefix(),
862 Command: "CAP",
863 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
864 })
865 case "REQ":
866 if len(args) == 0 {
867 return ircError{&irc.Message{
868 Command: err_invalidcapcmd,
869 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
870 }}
871 }
872
873 // TODO: atomically ack/nak the whole capability set
874 caps := strings.Fields(args[0])
875 ack := true
876 for _, name := range caps {
877 name = strings.ToLower(name)
878 enable := !strings.HasPrefix(name, "-")
879 if !enable {
880 name = strings.TrimPrefix(name, "-")
881 }
882
883 if enable == dc.caps[name] {
884 continue
885 }
886
887 _, ok := dc.supportedCaps[name]
888 if !ok {
889 ack = false
890 break
891 }
892
893 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
894 // cap-notify cannot be disabled with CAP version 302
895 ack = false
896 break
897 }
898
899 dc.caps[name] = enable
900 }
901
902 reply := "NAK"
903 if ack {
904 reply = "ACK"
905 }
906 dc.SendMessage(&irc.Message{
907 Prefix: dc.srv.prefix(),
908 Command: "CAP",
909 Params: []string{replyTo, reply, args[0]},
910 })
911
912 if !dc.registered {
913 dc.negotiatingCaps = true
914 }
915 case "END":
916 dc.negotiatingCaps = false
917 default:
918 return ircError{&irc.Message{
919 Command: err_invalidcapcmd,
920 Params: []string{replyTo, cmd, "Unknown CAP command"},
921 }}
922 }
923 return nil
924}
925
926func (dc *downstreamConn) setSupportedCap(name, value string) {
927 prevValue, hasPrev := dc.supportedCaps[name]
928 changed := !hasPrev || prevValue != value
929 dc.supportedCaps[name] = value
930
931 if !dc.caps["cap-notify"] || !changed {
932 return
933 }
934
935 replyTo := dc.nick
936 if !dc.registered {
937 replyTo = "*"
938 }
939
940 cap := name
941 if value != "" && dc.capVersion >= 302 {
942 cap = name + "=" + value
943 }
944
945 dc.SendMessage(&irc.Message{
946 Prefix: dc.srv.prefix(),
947 Command: "CAP",
948 Params: []string{replyTo, "NEW", cap},
949 })
950}
951
952func (dc *downstreamConn) unsetSupportedCap(name string) {
953 _, hasPrev := dc.supportedCaps[name]
954 delete(dc.supportedCaps, name)
955 delete(dc.caps, name)
956
957 if !dc.caps["cap-notify"] || !hasPrev {
958 return
959 }
960
961 replyTo := dc.nick
962 if !dc.registered {
963 replyTo = "*"
964 }
965
966 dc.SendMessage(&irc.Message{
967 Prefix: dc.srv.prefix(),
968 Command: "CAP",
969 Params: []string{replyTo, "DEL", name},
970 })
971}
972
973func (dc *downstreamConn) updateSupportedCaps() {
974 supportedCaps := make(map[string]bool)
975 for cap := range needAllDownstreamCaps {
976 supportedCaps[cap] = true
977 }
978 dc.forEachUpstream(func(uc *upstreamConn) {
979 for cap, supported := range supportedCaps {
980 supportedCaps[cap] = supported && uc.caps[cap]
981 }
982 })
983
984 for cap, supported := range supportedCaps {
985 if supported {
986 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
987 } else {
988 dc.unsetSupportedCap(cap)
989 }
990 }
991
992 if dc.srv.LogPath != "" && dc.network != nil {
993 dc.setSupportedCap("draft/event-playback", "")
994 } else {
995 dc.unsetSupportedCap("draft/event-playback")
996 }
997}
998
999func (dc *downstreamConn) updateNick() {
1000 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
1001 dc.SendMessage(&irc.Message{
1002 Prefix: dc.prefix(),
1003 Command: "NICK",
1004 Params: []string{uc.nick},
1005 })
1006 dc.nick = uc.nick
1007 dc.nickCM = casemapASCII(dc.nick)
1008 }
1009}
1010
1011func (dc *downstreamConn) updateRealname() {
1012 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
1013 dc.SendMessage(&irc.Message{
1014 Prefix: dc.prefix(),
1015 Command: "SETNAME",
1016 Params: []string{uc.realname},
1017 })
1018 dc.realname = uc.realname
1019 }
1020}
1021
1022func sanityCheckServer(addr string) error {
1023 dialer := net.Dialer{Timeout: 30 * time.Second}
1024 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
1025 if err != nil {
1026 return err
1027 }
1028 return conn.Close()
1029}
1030
1031func unmarshalUsername(rawUsername string) (username, client, network string) {
1032 username = rawUsername
1033
1034 i := strings.IndexAny(username, "/@")
1035 j := strings.LastIndexAny(username, "/@")
1036 if i >= 0 {
1037 username = rawUsername[:i]
1038 }
1039 if j >= 0 {
1040 if rawUsername[j] == '@' {
1041 client = rawUsername[j+1:]
1042 } else {
1043 network = rawUsername[j+1:]
1044 }
1045 }
1046 if i >= 0 && j >= 0 && i < j {
1047 if rawUsername[i] == '@' {
1048 client = rawUsername[i+1 : j]
1049 } else {
1050 network = rawUsername[i+1 : j]
1051 }
1052 }
1053
1054 return username, client, network
1055}
1056
1057func (dc *downstreamConn) authenticate(username, password string) error {
1058 username, clientName, networkName := unmarshalUsername(username)
1059
1060 u, err := dc.srv.db.GetUser(context.TODO(), username)
1061 if err != nil {
1062 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
1063 return errAuthFailed
1064 }
1065
1066 // Password auth disabled
1067 if u.Password == "" {
1068 return errAuthFailed
1069 }
1070
1071 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
1072 if err != nil {
1073 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
1074 return errAuthFailed
1075 }
1076
1077 dc.user = dc.srv.getUser(username)
1078 if dc.user == nil {
1079 dc.logger.Printf("failed authentication for %q: user not active", username)
1080 return errAuthFailed
1081 }
1082 dc.clientName = clientName
1083 dc.networkName = networkName
1084 return nil
1085}
1086
1087func (dc *downstreamConn) register() error {
1088 if dc.registered {
1089 return fmt.Errorf("tried to register twice")
1090 }
1091
1092 password := dc.password
1093 dc.password = ""
1094 if dc.user == nil {
1095 if err := dc.authenticate(dc.rawUsername, password); err != nil {
1096 return err
1097 }
1098 }
1099
1100 if dc.clientName == "" && dc.networkName == "" {
1101 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1102 }
1103
1104 dc.registered = true
1105 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1106 return nil
1107}
1108
1109func (dc *downstreamConn) loadNetwork() error {
1110 if dc.networkName == "" {
1111 return nil
1112 }
1113
1114 network := dc.user.getNetwork(dc.networkName)
1115 if network == nil {
1116 addr := dc.networkName
1117 if !strings.ContainsRune(addr, ':') {
1118 addr = addr + ":6697"
1119 }
1120
1121 dc.logger.Printf("trying to connect to new network %q", addr)
1122 if err := sanityCheckServer(addr); err != nil {
1123 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1124 return ircError{&irc.Message{
1125 Command: irc.ERR_PASSWDMISMATCH,
1126 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1127 }}
1128 }
1129
1130 // Some clients only allow specifying the nickname (and use the
1131 // nickname as a username too). Strip the network name from the
1132 // nickname when auto-saving networks.
1133 nick, _, _ := unmarshalUsername(dc.nick)
1134
1135 dc.logger.Printf("auto-saving network %q", dc.networkName)
1136 var err error
1137 network, err = dc.user.createNetwork(&Network{
1138 Addr: dc.networkName,
1139 Nick: nick,
1140 Enabled: true,
1141 })
1142 if err != nil {
1143 return err
1144 }
1145 }
1146
1147 dc.network = network
1148 return nil
1149}
1150
1151func (dc *downstreamConn) welcome() error {
1152 if dc.user == nil || !dc.registered {
1153 panic("tried to welcome an unregistered connection")
1154 }
1155
1156 // TODO: doing this might take some time. We should do it in dc.register
1157 // instead, but we'll potentially be adding a new network and this must be
1158 // done in the user goroutine.
1159 if err := dc.loadNetwork(); err != nil {
1160 return err
1161 }
1162
1163 isupport := []string{
1164 fmt.Sprintf("CHATHISTORY=%v", chatHistoryLimit),
1165 "CASEMAPPING=ascii",
1166 }
1167
1168 if dc.network != nil {
1169 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1170 }
1171 if dc.network == nil && dc.srv.Title != "" {
1172 isupport = append(isupport, "NETWORK="+encodeISUPPORT(dc.srv.Title))
1173 }
1174 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
1175 isupport = append(isupport, "WHOX")
1176 }
1177
1178 if uc := dc.upstream(); uc != nil {
1179 for k := range passthroughIsupport {
1180 v, ok := uc.isupport[k]
1181 if !ok {
1182 continue
1183 }
1184 if v != nil {
1185 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1186 } else {
1187 isupport = append(isupport, k)
1188 }
1189 }
1190 }
1191
1192 dc.SendMessage(&irc.Message{
1193 Prefix: dc.srv.prefix(),
1194 Command: irc.RPL_WELCOME,
1195 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1196 })
1197 dc.SendMessage(&irc.Message{
1198 Prefix: dc.srv.prefix(),
1199 Command: irc.RPL_YOURHOST,
1200 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
1201 })
1202 dc.SendMessage(&irc.Message{
1203 Prefix: dc.srv.prefix(),
1204 Command: irc.RPL_MYINFO,
1205 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1206 })
1207 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1208 dc.SendMessage(msg)
1209 }
1210 if uc := dc.upstream(); uc != nil {
1211 dc.SendMessage(&irc.Message{
1212 Prefix: dc.srv.prefix(),
1213 Command: irc.RPL_UMODEIS,
1214 Params: []string{dc.nick, string(uc.modes)},
1215 })
1216 }
1217
1218 if motd := dc.user.srv.MOTD(); motd != "" && dc.network == nil {
1219 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1220 dc.SendMessage(msg)
1221 }
1222 } else {
1223 motdHint := "No MOTD"
1224 if dc.network != nil {
1225 motdHint = "Use /motd to read the message of the day"
1226 }
1227 dc.SendMessage(&irc.Message{
1228 Prefix: dc.srv.prefix(),
1229 Command: irc.ERR_NOMOTD,
1230 Params: []string{dc.nick, motdHint},
1231 })
1232 }
1233
1234 dc.updateNick()
1235 dc.updateRealname()
1236 dc.updateSupportedCaps()
1237
1238 if dc.caps["soju.im/bouncer-networks-notify"] {
1239 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1240 dc.user.forEachNetwork(func(network *network) {
1241 idStr := fmt.Sprintf("%v", network.ID)
1242 attrs := getNetworkAttrs(network)
1243 dc.SendMessage(&irc.Message{
1244 Tags: irc.Tags{"batch": batchRef},
1245 Prefix: dc.srv.prefix(),
1246 Command: "BOUNCER",
1247 Params: []string{"NETWORK", idStr, attrs.String()},
1248 })
1249 })
1250 })
1251 }
1252
1253 dc.forEachUpstream(func(uc *upstreamConn) {
1254 for _, entry := range uc.channels.innerMap {
1255 ch := entry.value.(*upstreamChannel)
1256 if !ch.complete {
1257 continue
1258 }
1259 record := uc.network.channels.Value(ch.Name)
1260 if record != nil && record.Detached {
1261 continue
1262 }
1263
1264 dc.SendMessage(&irc.Message{
1265 Prefix: dc.prefix(),
1266 Command: "JOIN",
1267 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1268 })
1269
1270 forwardChannel(dc, ch)
1271 }
1272 })
1273
1274 dc.forEachNetwork(func(net *network) {
1275 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1276 return
1277 }
1278
1279 // Only send history if we're the first connected client with that name
1280 // for the network
1281 firstClient := true
1282 dc.user.forEachDownstream(func(c *downstreamConn) {
1283 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1284 firstClient = false
1285 }
1286 })
1287 if firstClient {
1288 net.delivered.ForEachTarget(func(target string) {
1289 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1290 if lastDelivered == "" {
1291 return
1292 }
1293
1294 dc.sendTargetBacklog(net, target, lastDelivered)
1295
1296 // Fast-forward history to last message
1297 targetCM := net.casemap(target)
1298 lastID, err := dc.user.msgStore.LastMsgID(&net.Network, targetCM, time.Now())
1299 if err != nil {
1300 dc.logger.Printf("failed to get last message ID: %v", err)
1301 return
1302 }
1303 net.delivered.StoreID(target, dc.clientName, lastID)
1304 })
1305 }
1306 })
1307
1308 return nil
1309}
1310
1311// messageSupportsBacklog checks whether the provided message can be sent as
1312// part of an history batch.
1313func (dc *downstreamConn) messageSupportsBacklog(msg *irc.Message) bool {
1314 // Don't replay all messages, because that would mess up client
1315 // state. For instance we just sent the list of users, sending
1316 // PART messages for one of these users would be incorrect.
1317 switch msg.Command {
1318 case "PRIVMSG", "NOTICE":
1319 return true
1320 }
1321 return false
1322}
1323
1324func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1325 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1326 return
1327 }
1328
1329 ch := net.channels.Value(target)
1330
1331 ctx, cancel := context.WithTimeout(context.TODO(), messageStoreTimeout)
1332 defer cancel()
1333
1334 targetCM := net.casemap(target)
1335 history, err := dc.user.msgStore.LoadLatestID(ctx, &net.Network, targetCM, msgID, backlogLimit)
1336 if err != nil {
1337 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1338 return
1339 }
1340
1341 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1342 for _, msg := range history {
1343 if ch != nil && ch.Detached {
1344 if net.detachedMessageNeedsRelay(ch, msg) {
1345 dc.relayDetachedMessage(net, msg)
1346 }
1347 } else {
1348 msg.Tags["batch"] = batchRef
1349 dc.SendMessage(dc.marshalMessage(msg, net))
1350 }
1351 }
1352 })
1353}
1354
1355func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1356 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1357 return
1358 }
1359
1360 sender := msg.Prefix.Name
1361 target, text := msg.Params[0], msg.Params[1]
1362 if net.isHighlight(msg) {
1363 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1364 } else {
1365 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1366 }
1367}
1368
1369func (dc *downstreamConn) runUntilRegistered() error {
1370 for !dc.registered {
1371 msg, err := dc.ReadMessage()
1372 if err != nil {
1373 return fmt.Errorf("failed to read IRC command: %w", err)
1374 }
1375
1376 err = dc.handleMessage(msg)
1377 if ircErr, ok := err.(ircError); ok {
1378 ircErr.Message.Prefix = dc.srv.prefix()
1379 dc.SendMessage(ircErr.Message)
1380 } else if err != nil {
1381 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1382 }
1383 }
1384
1385 return nil
1386}
1387
1388func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1389 switch msg.Command {
1390 case "CAP":
1391 var subCmd string
1392 if err := parseMessageParams(msg, &subCmd); err != nil {
1393 return err
1394 }
1395 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1396 return err
1397 }
1398 case "PING":
1399 var source, destination string
1400 if err := parseMessageParams(msg, &source); err != nil {
1401 return err
1402 }
1403 if len(msg.Params) > 1 {
1404 destination = msg.Params[1]
1405 }
1406 if destination != "" && destination != dc.srv.Hostname {
1407 return ircError{&irc.Message{
1408 Command: irc.ERR_NOSUCHSERVER,
1409 Params: []string{dc.nick, destination, "No such server"},
1410 }}
1411 }
1412 dc.SendMessage(&irc.Message{
1413 Prefix: dc.srv.prefix(),
1414 Command: "PONG",
1415 Params: []string{dc.srv.Hostname, source},
1416 })
1417 return nil
1418 case "PONG":
1419 if len(msg.Params) == 0 {
1420 return newNeedMoreParamsError(msg.Command)
1421 }
1422 token := msg.Params[len(msg.Params)-1]
1423 dc.handlePong(token)
1424 case "USER":
1425 return ircError{&irc.Message{
1426 Command: irc.ERR_ALREADYREGISTERED,
1427 Params: []string{dc.nick, "You may not reregister"},
1428 }}
1429 case "NICK":
1430 var rawNick string
1431 if err := parseMessageParams(msg, &rawNick); err != nil {
1432 return err
1433 }
1434
1435 nick := rawNick
1436 var upstream *upstreamConn
1437 if dc.upstream() == nil {
1438 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1439 if err == nil { // NICK nick/network: NICK only on a specific upstream
1440 upstream = uc
1441 nick = unmarshaledNick
1442 }
1443 }
1444
1445 if strings.ContainsAny(nick, illegalNickChars) {
1446 return ircError{&irc.Message{
1447 Command: irc.ERR_ERRONEUSNICKNAME,
1448 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1449 }}
1450 }
1451 if casemapASCII(nick) == serviceNickCM {
1452 return ircError{&irc.Message{
1453 Command: irc.ERR_NICKNAMEINUSE,
1454 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1455 }}
1456 }
1457
1458 var err error
1459 dc.forEachNetwork(func(n *network) {
1460 if err != nil || (upstream != nil && upstream.network != n) {
1461 return
1462 }
1463 n.Nick = nick
1464 err = dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network)
1465 })
1466 if err != nil {
1467 return err
1468 }
1469
1470 dc.forEachUpstream(func(uc *upstreamConn) {
1471 if upstream != nil && upstream != uc {
1472 return
1473 }
1474 uc.SendMessageLabeled(dc.id, &irc.Message{
1475 Command: "NICK",
1476 Params: []string{nick},
1477 })
1478 })
1479
1480 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1481 dc.SendMessage(&irc.Message{
1482 Prefix: dc.prefix(),
1483 Command: "NICK",
1484 Params: []string{nick},
1485 })
1486 dc.nick = nick
1487 dc.nickCM = casemapASCII(dc.nick)
1488 }
1489 case "SETNAME":
1490 var realname string
1491 if err := parseMessageParams(msg, &realname); err != nil {
1492 return err
1493 }
1494
1495 // If the client just resets to the default, just wipe the per-network
1496 // preference
1497 storeRealname := realname
1498 if realname == dc.user.Realname {
1499 storeRealname = ""
1500 }
1501
1502 var storeErr error
1503 var needUpdate []Network
1504 dc.forEachNetwork(func(n *network) {
1505 // We only need to call updateNetwork for upstreams that don't
1506 // support setname
1507 if uc := n.conn; uc != nil && uc.caps["setname"] {
1508 uc.SendMessageLabeled(dc.id, &irc.Message{
1509 Command: "SETNAME",
1510 Params: []string{realname},
1511 })
1512
1513 n.Realname = storeRealname
1514 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
1515 dc.logger.Printf("failed to store network realname: %v", err)
1516 storeErr = err
1517 }
1518 return
1519 }
1520
1521 record := n.Network // copy network record because we'll mutate it
1522 record.Realname = storeRealname
1523 needUpdate = append(needUpdate, record)
1524 })
1525
1526 // Walk the network list as a second step, because updateNetwork
1527 // mutates the original list
1528 for _, record := range needUpdate {
1529 if _, err := dc.user.updateNetwork(&record); err != nil {
1530 dc.logger.Printf("failed to update network realname: %v", err)
1531 storeErr = err
1532 }
1533 }
1534 if storeErr != nil {
1535 return ircError{&irc.Message{
1536 Command: "FAIL",
1537 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1538 }}
1539 }
1540
1541 if dc.upstream() == nil {
1542 dc.SendMessage(&irc.Message{
1543 Prefix: dc.prefix(),
1544 Command: "SETNAME",
1545 Params: []string{realname},
1546 })
1547 }
1548 case "JOIN":
1549 var namesStr string
1550 if err := parseMessageParams(msg, &namesStr); err != nil {
1551 return err
1552 }
1553
1554 var keys []string
1555 if len(msg.Params) > 1 {
1556 keys = strings.Split(msg.Params[1], ",")
1557 }
1558
1559 for i, name := range strings.Split(namesStr, ",") {
1560 uc, upstreamName, err := dc.unmarshalEntity(name)
1561 if err != nil {
1562 return err
1563 }
1564
1565 var key string
1566 if len(keys) > i {
1567 key = keys[i]
1568 }
1569
1570 if !uc.isChannel(upstreamName) {
1571 dc.SendMessage(&irc.Message{
1572 Prefix: dc.srv.prefix(),
1573 Command: irc.ERR_NOSUCHCHANNEL,
1574 Params: []string{name, "Not a channel name"},
1575 })
1576 continue
1577 }
1578
1579 params := []string{upstreamName}
1580 if key != "" {
1581 params = append(params, key)
1582 }
1583 uc.SendMessageLabeled(dc.id, &irc.Message{
1584 Command: "JOIN",
1585 Params: params,
1586 })
1587
1588 ch := uc.network.channels.Value(upstreamName)
1589 if ch != nil {
1590 // Don't clear the channel key if there's one set
1591 // TODO: add a way to unset the channel key
1592 if key != "" {
1593 ch.Key = key
1594 }
1595 uc.network.attach(ch)
1596 } else {
1597 ch = &Channel{
1598 Name: upstreamName,
1599 Key: key,
1600 }
1601 uc.network.channels.SetValue(upstreamName, ch)
1602 }
1603 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1604 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1605 }
1606 }
1607 case "PART":
1608 var namesStr string
1609 if err := parseMessageParams(msg, &namesStr); err != nil {
1610 return err
1611 }
1612
1613 var reason string
1614 if len(msg.Params) > 1 {
1615 reason = msg.Params[1]
1616 }
1617
1618 for _, name := range strings.Split(namesStr, ",") {
1619 uc, upstreamName, err := dc.unmarshalEntity(name)
1620 if err != nil {
1621 return err
1622 }
1623
1624 if strings.EqualFold(reason, "detach") {
1625 ch := uc.network.channels.Value(upstreamName)
1626 if ch != nil {
1627 uc.network.detach(ch)
1628 } else {
1629 ch = &Channel{
1630 Name: name,
1631 Detached: true,
1632 }
1633 uc.network.channels.SetValue(upstreamName, ch)
1634 }
1635 if err := dc.srv.db.StoreChannel(context.TODO(), uc.network.ID, ch); err != nil {
1636 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1637 }
1638 } else {
1639 params := []string{upstreamName}
1640 if reason != "" {
1641 params = append(params, reason)
1642 }
1643 uc.SendMessageLabeled(dc.id, &irc.Message{
1644 Command: "PART",
1645 Params: params,
1646 })
1647
1648 if err := uc.network.deleteChannel(upstreamName); err != nil {
1649 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1650 }
1651 }
1652 }
1653 case "KICK":
1654 var channelStr, userStr string
1655 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1656 return err
1657 }
1658
1659 channels := strings.Split(channelStr, ",")
1660 users := strings.Split(userStr, ",")
1661
1662 var reason string
1663 if len(msg.Params) > 2 {
1664 reason = msg.Params[2]
1665 }
1666
1667 if len(channels) != 1 && len(channels) != len(users) {
1668 return ircError{&irc.Message{
1669 Command: irc.ERR_BADCHANMASK,
1670 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1671 }}
1672 }
1673
1674 for i, user := range users {
1675 var channel string
1676 if len(channels) == 1 {
1677 channel = channels[0]
1678 } else {
1679 channel = channels[i]
1680 }
1681
1682 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1683 if err != nil {
1684 return err
1685 }
1686
1687 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1688 if err != nil {
1689 return err
1690 }
1691
1692 if ucChannel != ucUser {
1693 return ircError{&irc.Message{
1694 Command: irc.ERR_USERNOTINCHANNEL,
1695 Params: []string{dc.nick, user, channel, "They are on another network"},
1696 }}
1697 }
1698 uc := ucChannel
1699
1700 params := []string{upstreamChannel, upstreamUser}
1701 if reason != "" {
1702 params = append(params, reason)
1703 }
1704 uc.SendMessageLabeled(dc.id, &irc.Message{
1705 Command: "KICK",
1706 Params: params,
1707 })
1708 }
1709 case "MODE":
1710 var name string
1711 if err := parseMessageParams(msg, &name); err != nil {
1712 return err
1713 }
1714
1715 var modeStr string
1716 if len(msg.Params) > 1 {
1717 modeStr = msg.Params[1]
1718 }
1719
1720 if casemapASCII(name) == dc.nickCM {
1721 if modeStr != "" {
1722 if uc := dc.upstream(); uc != nil {
1723 uc.SendMessageLabeled(dc.id, &irc.Message{
1724 Command: "MODE",
1725 Params: []string{uc.nick, modeStr},
1726 })
1727 } else {
1728 dc.SendMessage(&irc.Message{
1729 Prefix: dc.srv.prefix(),
1730 Command: irc.ERR_UMODEUNKNOWNFLAG,
1731 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1732 })
1733 }
1734 } else {
1735 var userMode string
1736 if uc := dc.upstream(); uc != nil {
1737 userMode = string(uc.modes)
1738 }
1739
1740 dc.SendMessage(&irc.Message{
1741 Prefix: dc.srv.prefix(),
1742 Command: irc.RPL_UMODEIS,
1743 Params: []string{dc.nick, userMode},
1744 })
1745 }
1746 return nil
1747 }
1748
1749 uc, upstreamName, err := dc.unmarshalEntity(name)
1750 if err != nil {
1751 return err
1752 }
1753
1754 if !uc.isChannel(upstreamName) {
1755 return ircError{&irc.Message{
1756 Command: irc.ERR_USERSDONTMATCH,
1757 Params: []string{dc.nick, "Cannot change mode for other users"},
1758 }}
1759 }
1760
1761 if modeStr != "" {
1762 params := []string{upstreamName, modeStr}
1763 params = append(params, msg.Params[2:]...)
1764 uc.SendMessageLabeled(dc.id, &irc.Message{
1765 Command: "MODE",
1766 Params: params,
1767 })
1768 } else {
1769 ch := uc.channels.Value(upstreamName)
1770 if ch == nil {
1771 return ircError{&irc.Message{
1772 Command: irc.ERR_NOSUCHCHANNEL,
1773 Params: []string{dc.nick, name, "No such channel"},
1774 }}
1775 }
1776
1777 if ch.modes == nil {
1778 // we haven't received the initial RPL_CHANNELMODEIS yet
1779 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1780 return nil
1781 }
1782
1783 modeStr, modeParams := ch.modes.Format()
1784 params := []string{dc.nick, name, modeStr}
1785 params = append(params, modeParams...)
1786
1787 dc.SendMessage(&irc.Message{
1788 Prefix: dc.srv.prefix(),
1789 Command: irc.RPL_CHANNELMODEIS,
1790 Params: params,
1791 })
1792 if ch.creationTime != "" {
1793 dc.SendMessage(&irc.Message{
1794 Prefix: dc.srv.prefix(),
1795 Command: rpl_creationtime,
1796 Params: []string{dc.nick, name, ch.creationTime},
1797 })
1798 }
1799 }
1800 case "TOPIC":
1801 var channel string
1802 if err := parseMessageParams(msg, &channel); err != nil {
1803 return err
1804 }
1805
1806 uc, upstreamName, err := dc.unmarshalEntity(channel)
1807 if err != nil {
1808 return err
1809 }
1810
1811 if len(msg.Params) > 1 { // setting topic
1812 topic := msg.Params[1]
1813 uc.SendMessageLabeled(dc.id, &irc.Message{
1814 Command: "TOPIC",
1815 Params: []string{upstreamName, topic},
1816 })
1817 } else { // getting topic
1818 ch := uc.channels.Value(upstreamName)
1819 if ch == nil {
1820 return ircError{&irc.Message{
1821 Command: irc.ERR_NOSUCHCHANNEL,
1822 Params: []string{dc.nick, upstreamName, "No such channel"},
1823 }}
1824 }
1825 sendTopic(dc, ch)
1826 }
1827 case "LIST":
1828 // TODO: support ELIST when supported by all upstreams
1829
1830 pl := pendingLIST{
1831 downstreamID: dc.id,
1832 pendingCommands: make(map[int64]*irc.Message),
1833 }
1834 var upstream *upstreamConn
1835 var upstreamChannels map[int64][]string
1836 if len(msg.Params) > 0 {
1837 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1838 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1839 upstream = uc
1840 } else {
1841 upstreamChannels = make(map[int64][]string)
1842 channels := strings.Split(msg.Params[0], ",")
1843 for _, channel := range channels {
1844 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1845 if err != nil {
1846 return err
1847 }
1848 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1849 }
1850 }
1851 }
1852
1853 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1854 dc.forEachUpstream(func(uc *upstreamConn) {
1855 if upstream != nil && upstream != uc {
1856 return
1857 }
1858 var params []string
1859 if upstreamChannels != nil {
1860 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1861 params = []string{strings.Join(channels, ",")}
1862 } else {
1863 return
1864 }
1865 }
1866 pl.pendingCommands[uc.network.ID] = &irc.Message{
1867 Command: "LIST",
1868 Params: params,
1869 }
1870 uc.trySendLIST(dc.id)
1871 })
1872 case "NAMES":
1873 if len(msg.Params) == 0 {
1874 dc.SendMessage(&irc.Message{
1875 Prefix: dc.srv.prefix(),
1876 Command: irc.RPL_ENDOFNAMES,
1877 Params: []string{dc.nick, "*", "End of /NAMES list"},
1878 })
1879 return nil
1880 }
1881
1882 channels := strings.Split(msg.Params[0], ",")
1883 for _, channel := range channels {
1884 uc, upstreamName, err := dc.unmarshalEntity(channel)
1885 if err != nil {
1886 return err
1887 }
1888
1889 ch := uc.channels.Value(upstreamName)
1890 if ch != nil {
1891 sendNames(dc, ch)
1892 } else {
1893 // NAMES on a channel we have not joined, ask upstream
1894 uc.SendMessageLabeled(dc.id, &irc.Message{
1895 Command: "NAMES",
1896 Params: []string{upstreamName},
1897 })
1898 }
1899 }
1900 // For WHOX docs, see:
1901 // - http://faerion.sourceforge.net/doc/irc/whox.var
1902 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1903 // Note, many features aren't widely implemented, such as flags and mask2
1904 case "WHO":
1905 if len(msg.Params) == 0 {
1906 // TODO: support WHO without parameters
1907 dc.SendMessage(&irc.Message{
1908 Prefix: dc.srv.prefix(),
1909 Command: irc.RPL_ENDOFWHO,
1910 Params: []string{dc.nick, "*", "End of /WHO list"},
1911 })
1912 return nil
1913 }
1914
1915 // Clients will use the first mask to match RPL_ENDOFWHO
1916 endOfWhoToken := msg.Params[0]
1917
1918 // TODO: add support for WHOX mask2
1919 mask := msg.Params[0]
1920 var options string
1921 if len(msg.Params) > 1 {
1922 options = msg.Params[1]
1923 }
1924
1925 optionsParts := strings.SplitN(options, "%", 2)
1926 // TODO: add support for WHOX flags in optionsParts[0]
1927 var fields, whoxToken string
1928 if len(optionsParts) == 2 {
1929 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1930 fields = strings.ToLower(optionsParts[0])
1931 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1932 whoxToken = optionsParts[1]
1933 }
1934 }
1935
1936 // TODO: support mixed bouncer/upstream WHO queries
1937 maskCM := casemapASCII(mask)
1938 if dc.network == nil && maskCM == dc.nickCM {
1939 // TODO: support AWAY (H/G) in self WHO reply
1940 flags := "H"
1941 if dc.user.Admin {
1942 flags += "*"
1943 }
1944 info := whoxInfo{
1945 Token: whoxToken,
1946 Username: dc.user.Username,
1947 Hostname: dc.hostname,
1948 Server: dc.srv.Hostname,
1949 Nickname: dc.nick,
1950 Flags: flags,
1951 Account: dc.user.Username,
1952 Realname: dc.realname,
1953 }
1954 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1955 dc.SendMessage(&irc.Message{
1956 Prefix: dc.srv.prefix(),
1957 Command: irc.RPL_ENDOFWHO,
1958 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1959 })
1960 return nil
1961 }
1962 if maskCM == serviceNickCM {
1963 info := whoxInfo{
1964 Token: whoxToken,
1965 Username: servicePrefix.User,
1966 Hostname: servicePrefix.Host,
1967 Server: dc.srv.Hostname,
1968 Nickname: serviceNick,
1969 Flags: "H*",
1970 Account: serviceNick,
1971 Realname: serviceRealname,
1972 }
1973 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1974 dc.SendMessage(&irc.Message{
1975 Prefix: dc.srv.prefix(),
1976 Command: irc.RPL_ENDOFWHO,
1977 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1978 })
1979 return nil
1980 }
1981
1982 // TODO: properly support WHO masks
1983 uc, upstreamMask, err := dc.unmarshalEntity(mask)
1984 if err != nil {
1985 return err
1986 }
1987
1988 params := []string{upstreamMask}
1989 if options != "" {
1990 params = append(params, options)
1991 }
1992
1993 uc.SendMessageLabeled(dc.id, &irc.Message{
1994 Command: "WHO",
1995 Params: params,
1996 })
1997 case "WHOIS":
1998 if len(msg.Params) == 0 {
1999 return ircError{&irc.Message{
2000 Command: irc.ERR_NONICKNAMEGIVEN,
2001 Params: []string{dc.nick, "No nickname given"},
2002 }}
2003 }
2004
2005 var target, mask string
2006 if len(msg.Params) == 1 {
2007 target = ""
2008 mask = msg.Params[0]
2009 } else {
2010 target = msg.Params[0]
2011 mask = msg.Params[1]
2012 }
2013 // TODO: support multiple WHOIS users
2014 if i := strings.IndexByte(mask, ','); i >= 0 {
2015 mask = mask[:i]
2016 }
2017
2018 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2019 dc.SendMessage(&irc.Message{
2020 Prefix: dc.srv.prefix(),
2021 Command: irc.RPL_WHOISUSER,
2022 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2023 })
2024 dc.SendMessage(&irc.Message{
2025 Prefix: dc.srv.prefix(),
2026 Command: irc.RPL_WHOISSERVER,
2027 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
2028 })
2029 if dc.user.Admin {
2030 dc.SendMessage(&irc.Message{
2031 Prefix: dc.srv.prefix(),
2032 Command: irc.RPL_WHOISOPERATOR,
2033 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2034 })
2035 }
2036 dc.SendMessage(&irc.Message{
2037 Prefix: dc.srv.prefix(),
2038 Command: rpl_whoisaccount,
2039 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2040 })
2041 dc.SendMessage(&irc.Message{
2042 Prefix: dc.srv.prefix(),
2043 Command: irc.RPL_ENDOFWHOIS,
2044 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2045 })
2046 return nil
2047 }
2048 if casemapASCII(mask) == serviceNickCM {
2049 dc.SendMessage(&irc.Message{
2050 Prefix: dc.srv.prefix(),
2051 Command: irc.RPL_WHOISUSER,
2052 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2053 })
2054 dc.SendMessage(&irc.Message{
2055 Prefix: dc.srv.prefix(),
2056 Command: irc.RPL_WHOISSERVER,
2057 Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
2058 })
2059 dc.SendMessage(&irc.Message{
2060 Prefix: dc.srv.prefix(),
2061 Command: irc.RPL_WHOISOPERATOR,
2062 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2063 })
2064 dc.SendMessage(&irc.Message{
2065 Prefix: dc.srv.prefix(),
2066 Command: rpl_whoisaccount,
2067 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2068 })
2069 dc.SendMessage(&irc.Message{
2070 Prefix: dc.srv.prefix(),
2071 Command: irc.RPL_ENDOFWHOIS,
2072 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2073 })
2074 return nil
2075 }
2076
2077 // TODO: support WHOIS masks
2078 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2079 if err != nil {
2080 return err
2081 }
2082
2083 var params []string
2084 if target != "" {
2085 if target == mask { // WHOIS nick nick
2086 params = []string{upstreamNick, upstreamNick}
2087 } else {
2088 params = []string{target, upstreamNick}
2089 }
2090 } else {
2091 params = []string{upstreamNick}
2092 }
2093
2094 uc.SendMessageLabeled(dc.id, &irc.Message{
2095 Command: "WHOIS",
2096 Params: params,
2097 })
2098 case "PRIVMSG", "NOTICE":
2099 var targetsStr, text string
2100 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2101 return err
2102 }
2103 tags := copyClientTags(msg.Tags)
2104
2105 for _, name := range strings.Split(targetsStr, ",") {
2106 if name == "$"+dc.srv.Hostname || (name == "$*" && dc.network == nil) {
2107 // "$" means a server mask follows. If it's the bouncer's
2108 // hostname, broadcast the message to all bouncer users.
2109 if !dc.user.Admin {
2110 return ircError{&irc.Message{
2111 Prefix: dc.srv.prefix(),
2112 Command: irc.ERR_BADMASK,
2113 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2114 }}
2115 }
2116
2117 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2118
2119 broadcastTags := tags.Copy()
2120 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2121 broadcastMsg := &irc.Message{
2122 Tags: broadcastTags,
2123 Prefix: servicePrefix,
2124 Command: msg.Command,
2125 Params: []string{name, text},
2126 }
2127 dc.srv.forEachUser(func(u *user) {
2128 u.events <- eventBroadcast{broadcastMsg}
2129 })
2130 continue
2131 }
2132
2133 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2134 dc.SendMessage(&irc.Message{
2135 Tags: msg.Tags.Copy(),
2136 Prefix: dc.prefix(),
2137 Command: msg.Command,
2138 Params: []string{name, text},
2139 })
2140 continue
2141 }
2142
2143 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2144 if dc.caps["echo-message"] {
2145 echoTags := tags.Copy()
2146 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2147 dc.SendMessage(&irc.Message{
2148 Tags: echoTags,
2149 Prefix: dc.prefix(),
2150 Command: msg.Command,
2151 Params: []string{name, text},
2152 })
2153 }
2154 handleServicePRIVMSG(dc, text)
2155 continue
2156 }
2157
2158 uc, upstreamName, err := dc.unmarshalEntity(name)
2159 if err != nil {
2160 return err
2161 }
2162
2163 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2164 dc.handleNickServPRIVMSG(uc, text)
2165 }
2166
2167 unmarshaledText := text
2168 if uc.isChannel(upstreamName) {
2169 unmarshaledText = dc.unmarshalText(uc, text)
2170 }
2171 uc.SendMessageLabeled(dc.id, &irc.Message{
2172 Tags: tags,
2173 Command: msg.Command,
2174 Params: []string{upstreamName, unmarshaledText},
2175 })
2176
2177 echoTags := tags.Copy()
2178 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2179 if uc.account != "" {
2180 echoTags["account"] = irc.TagValue(uc.account)
2181 }
2182 echoMsg := &irc.Message{
2183 Tags: echoTags,
2184 Prefix: &irc.Prefix{
2185 Name: uc.nick,
2186 User: uc.username,
2187 },
2188 Command: msg.Command,
2189 Params: []string{upstreamName, text},
2190 }
2191 uc.produce(upstreamName, echoMsg, dc)
2192
2193 uc.updateChannelAutoDetach(upstreamName)
2194 }
2195 case "TAGMSG":
2196 var targetsStr string
2197 if err := parseMessageParams(msg, &targetsStr); err != nil {
2198 return err
2199 }
2200 tags := copyClientTags(msg.Tags)
2201
2202 for _, name := range strings.Split(targetsStr, ",") {
2203 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2204 dc.SendMessage(&irc.Message{
2205 Tags: msg.Tags.Copy(),
2206 Prefix: dc.prefix(),
2207 Command: "TAGMSG",
2208 Params: []string{name},
2209 })
2210 continue
2211 }
2212
2213 if casemapASCII(name) == serviceNickCM {
2214 continue
2215 }
2216
2217 uc, upstreamName, err := dc.unmarshalEntity(name)
2218 if err != nil {
2219 return err
2220 }
2221 if _, ok := uc.caps["message-tags"]; !ok {
2222 continue
2223 }
2224
2225 uc.SendMessageLabeled(dc.id, &irc.Message{
2226 Tags: tags,
2227 Command: "TAGMSG",
2228 Params: []string{upstreamName},
2229 })
2230
2231 uc.updateChannelAutoDetach(upstreamName)
2232 }
2233 case "INVITE":
2234 var user, channel string
2235 if err := parseMessageParams(msg, &user, &channel); err != nil {
2236 return err
2237 }
2238
2239 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2240 if err != nil {
2241 return err
2242 }
2243
2244 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2245 if err != nil {
2246 return err
2247 }
2248
2249 if ucChannel != ucUser {
2250 return ircError{&irc.Message{
2251 Command: irc.ERR_USERNOTINCHANNEL,
2252 Params: []string{dc.nick, user, channel, "They are on another network"},
2253 }}
2254 }
2255 uc := ucChannel
2256
2257 uc.SendMessageLabeled(dc.id, &irc.Message{
2258 Command: "INVITE",
2259 Params: []string{upstreamUser, upstreamChannel},
2260 })
2261 case "CHATHISTORY":
2262 var subcommand string
2263 if err := parseMessageParams(msg, &subcommand); err != nil {
2264 return err
2265 }
2266 var target, limitStr string
2267 var boundsStr [2]string
2268 switch subcommand {
2269 case "AFTER", "BEFORE":
2270 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2271 return err
2272 }
2273 case "BETWEEN":
2274 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2275 return err
2276 }
2277 case "TARGETS":
2278 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2279 return err
2280 }
2281 default:
2282 // TODO: support LATEST, AROUND
2283 return ircError{&irc.Message{
2284 Command: "FAIL",
2285 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2286 }}
2287 }
2288
2289 // We don't save history for our service
2290 if casemapASCII(target) == serviceNickCM {
2291 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2292 return nil
2293 }
2294
2295 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2296 if !ok {
2297 return ircError{&irc.Message{
2298 Command: irc.ERR_UNKNOWNCOMMAND,
2299 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2300 }}
2301 }
2302
2303 network, entity, err := dc.unmarshalEntityNetwork(target)
2304 if err != nil {
2305 return err
2306 }
2307 entity = network.casemap(entity)
2308
2309 // TODO: support msgid criteria
2310 var bounds [2]time.Time
2311 bounds[0] = parseChatHistoryBound(boundsStr[0])
2312 if bounds[0].IsZero() {
2313 return ircError{&irc.Message{
2314 Command: "FAIL",
2315 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2316 }}
2317 }
2318
2319 if boundsStr[1] != "" {
2320 bounds[1] = parseChatHistoryBound(boundsStr[1])
2321 if bounds[1].IsZero() {
2322 return ircError{&irc.Message{
2323 Command: "FAIL",
2324 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2325 }}
2326 }
2327 }
2328
2329 limit, err := strconv.Atoi(limitStr)
2330 if err != nil || limit < 0 || limit > chatHistoryLimit {
2331 return ircError{&irc.Message{
2332 Command: "FAIL",
2333 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2334 }}
2335 }
2336
2337 eventPlayback := dc.caps["draft/event-playback"]
2338
2339 ctx, cancel := context.WithTimeout(context.TODO(), messageStoreTimeout)
2340 defer cancel()
2341
2342 var history []*irc.Message
2343 switch subcommand {
2344 case "BEFORE":
2345 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], time.Time{}, limit, eventPlayback)
2346 case "AFTER":
2347 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], time.Now(), limit, eventPlayback)
2348 case "BETWEEN":
2349 if bounds[0].Before(bounds[1]) {
2350 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2351 } else {
2352 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2353 }
2354 case "TARGETS":
2355 // TODO: support TARGETS in multi-upstream mode
2356 targets, err := store.ListTargets(ctx, &network.Network, bounds[0], bounds[1], limit, eventPlayback)
2357 if err != nil {
2358 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2359 return ircError{&irc.Message{
2360 Command: "FAIL",
2361 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2362 }}
2363 }
2364
2365 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2366 for _, target := range targets {
2367 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2368 continue
2369 }
2370
2371 dc.SendMessage(&irc.Message{
2372 Tags: irc.Tags{"batch": batchRef},
2373 Prefix: dc.srv.prefix(),
2374 Command: "CHATHISTORY",
2375 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2376 })
2377 }
2378 })
2379
2380 return nil
2381 }
2382 if err != nil {
2383 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2384 return newChatHistoryError(subcommand, target)
2385 }
2386
2387 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2388 for _, msg := range history {
2389 msg.Tags["batch"] = batchRef
2390 dc.SendMessage(dc.marshalMessage(msg, network))
2391 }
2392 })
2393 case "BOUNCER":
2394 var subcommand string
2395 if err := parseMessageParams(msg, &subcommand); err != nil {
2396 return err
2397 }
2398
2399 switch strings.ToUpper(subcommand) {
2400 case "BIND":
2401 return ircError{&irc.Message{
2402 Command: "FAIL",
2403 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2404 }}
2405 case "LISTNETWORKS":
2406 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2407 dc.user.forEachNetwork(func(network *network) {
2408 idStr := fmt.Sprintf("%v", network.ID)
2409 attrs := getNetworkAttrs(network)
2410 dc.SendMessage(&irc.Message{
2411 Tags: irc.Tags{"batch": batchRef},
2412 Prefix: dc.srv.prefix(),
2413 Command: "BOUNCER",
2414 Params: []string{"NETWORK", idStr, attrs.String()},
2415 })
2416 })
2417 })
2418 case "ADDNETWORK":
2419 var attrsStr string
2420 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2421 return err
2422 }
2423 attrs := irc.ParseTags(attrsStr)
2424
2425 record := &Network{Nick: dc.nick, Enabled: true}
2426 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2427 return err
2428 }
2429
2430 if record.Nick == dc.user.Username {
2431 record.Nick = ""
2432 }
2433 if record.Realname == dc.user.Realname {
2434 record.Realname = ""
2435 }
2436
2437 network, err := dc.user.createNetwork(record)
2438 if err != nil {
2439 return ircError{&irc.Message{
2440 Command: "FAIL",
2441 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2442 }}
2443 }
2444
2445 dc.SendMessage(&irc.Message{
2446 Prefix: dc.srv.prefix(),
2447 Command: "BOUNCER",
2448 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2449 })
2450 case "CHANGENETWORK":
2451 var idStr, attrsStr string
2452 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2453 return err
2454 }
2455 id, err := parseBouncerNetID(subcommand, idStr)
2456 if err != nil {
2457 return err
2458 }
2459 attrs := irc.ParseTags(attrsStr)
2460
2461 net := dc.user.getNetworkByID(id)
2462 if net == nil {
2463 return ircError{&irc.Message{
2464 Command: "FAIL",
2465 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2466 }}
2467 }
2468
2469 record := net.Network // copy network record because we'll mutate it
2470 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2471 return err
2472 }
2473
2474 if record.Nick == dc.user.Username {
2475 record.Nick = ""
2476 }
2477 if record.Realname == dc.user.Realname {
2478 record.Realname = ""
2479 }
2480
2481 _, err = dc.user.updateNetwork(&record)
2482 if err != nil {
2483 return ircError{&irc.Message{
2484 Command: "FAIL",
2485 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2486 }}
2487 }
2488
2489 dc.SendMessage(&irc.Message{
2490 Prefix: dc.srv.prefix(),
2491 Command: "BOUNCER",
2492 Params: []string{"CHANGENETWORK", idStr},
2493 })
2494 case "DELNETWORK":
2495 var idStr string
2496 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2497 return err
2498 }
2499 id, err := parseBouncerNetID(subcommand, idStr)
2500 if err != nil {
2501 return err
2502 }
2503
2504 net := dc.user.getNetworkByID(id)
2505 if net == nil {
2506 return ircError{&irc.Message{
2507 Command: "FAIL",
2508 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2509 }}
2510 }
2511
2512 if err := dc.user.deleteNetwork(net.ID); err != nil {
2513 return err
2514 }
2515
2516 dc.SendMessage(&irc.Message{
2517 Prefix: dc.srv.prefix(),
2518 Command: "BOUNCER",
2519 Params: []string{"DELNETWORK", idStr},
2520 })
2521 default:
2522 return ircError{&irc.Message{
2523 Command: "FAIL",
2524 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2525 }}
2526 }
2527 default:
2528 dc.logger.Printf("unhandled message: %v", msg)
2529
2530 // Only forward unknown commands in single-upstream mode
2531 uc := dc.upstream()
2532 if uc == nil {
2533 return newUnknownCommandError(msg.Command)
2534 }
2535
2536 uc.SendMessageLabeled(dc.id, msg)
2537 }
2538 return nil
2539}
2540
2541func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
2542 username, password, ok := parseNickServCredentials(text, uc.nick)
2543 if !ok {
2544 return
2545 }
2546
2547 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2548 // automatically erase the key pair or any other credentials.
2549 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2550 return
2551 }
2552
2553 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2554 n := uc.network
2555 n.SASL.Mechanism = "PLAIN"
2556 n.SASL.Plain.Username = username
2557 n.SASL.Plain.Password = password
2558 if err := dc.srv.db.StoreNetwork(context.TODO(), dc.user.ID, &n.Network); err != nil {
2559 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2560 }
2561}
2562
2563func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2564 fields := strings.Fields(text)
2565 if len(fields) < 2 {
2566 return "", "", false
2567 }
2568 cmd := strings.ToUpper(fields[0])
2569 params := fields[1:]
2570 switch cmd {
2571 case "REGISTER":
2572 username = nick
2573 password = params[0]
2574 case "IDENTIFY":
2575 if len(params) == 1 {
2576 username = nick
2577 password = params[0]
2578 } else {
2579 username = params[0]
2580 password = params[1]
2581 }
2582 case "SET":
2583 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2584 username = nick
2585 password = params[1]
2586 }
2587 default:
2588 return "", "", false
2589 }
2590 return username, password, true
2591}
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