source: code/trunk/downstream.go@ 679

Last change on this file since 679 was 677, checked in by contact, 4 years ago

Add context support to service

References: ​https://todo.sr.ht/~emersion/soju/141
File size: 65.6 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(context.TODO(), &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 if dc.network == nil && dc.caps["soju.im/bouncer-networks"] && dc.user.Admin {
1218 dc.SendMessage(&irc.Message{
1219 Prefix: dc.srv.prefix(),
1220 Command: irc.RPL_UMODEIS,
1221 Params: []string{dc.nick, "+o"},
1222 })
1223 }
1224
1225 if motd := dc.user.srv.MOTD(); motd != "" && dc.network == nil {
1226 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1227 dc.SendMessage(msg)
1228 }
1229 } else {
1230 motdHint := "No MOTD"
1231 if dc.network != nil {
1232 motdHint = "Use /motd to read the message of the day"
1233 }
1234 dc.SendMessage(&irc.Message{
1235 Prefix: dc.srv.prefix(),
1236 Command: irc.ERR_NOMOTD,
1237 Params: []string{dc.nick, motdHint},
1238 })
1239 }
1240
1241 dc.updateNick()
1242 dc.updateRealname()
1243 dc.updateSupportedCaps()
1244
1245 if dc.caps["soju.im/bouncer-networks-notify"] {
1246 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1247 dc.user.forEachNetwork(func(network *network) {
1248 idStr := fmt.Sprintf("%v", network.ID)
1249 attrs := getNetworkAttrs(network)
1250 dc.SendMessage(&irc.Message{
1251 Tags: irc.Tags{"batch": batchRef},
1252 Prefix: dc.srv.prefix(),
1253 Command: "BOUNCER",
1254 Params: []string{"NETWORK", idStr, attrs.String()},
1255 })
1256 })
1257 })
1258 }
1259
1260 dc.forEachUpstream(func(uc *upstreamConn) {
1261 for _, entry := range uc.channels.innerMap {
1262 ch := entry.value.(*upstreamChannel)
1263 if !ch.complete {
1264 continue
1265 }
1266 record := uc.network.channels.Value(ch.Name)
1267 if record != nil && record.Detached {
1268 continue
1269 }
1270
1271 dc.SendMessage(&irc.Message{
1272 Prefix: dc.prefix(),
1273 Command: "JOIN",
1274 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1275 })
1276
1277 forwardChannel(dc, ch)
1278 }
1279 })
1280
1281 dc.forEachNetwork(func(net *network) {
1282 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1283 return
1284 }
1285
1286 // Only send history if we're the first connected client with that name
1287 // for the network
1288 firstClient := true
1289 dc.user.forEachDownstream(func(c *downstreamConn) {
1290 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1291 firstClient = false
1292 }
1293 })
1294 if firstClient {
1295 net.delivered.ForEachTarget(func(target string) {
1296 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1297 if lastDelivered == "" {
1298 return
1299 }
1300
1301 dc.sendTargetBacklog(net, target, lastDelivered)
1302
1303 // Fast-forward history to last message
1304 targetCM := net.casemap(target)
1305 lastID, err := dc.user.msgStore.LastMsgID(&net.Network, targetCM, time.Now())
1306 if err != nil {
1307 dc.logger.Printf("failed to get last message ID: %v", err)
1308 return
1309 }
1310 net.delivered.StoreID(target, dc.clientName, lastID)
1311 })
1312 }
1313 })
1314
1315 return nil
1316}
1317
1318// messageSupportsBacklog checks whether the provided message can be sent as
1319// part of an history batch.
1320func (dc *downstreamConn) messageSupportsBacklog(msg *irc.Message) bool {
1321 // Don't replay all messages, because that would mess up client
1322 // state. For instance we just sent the list of users, sending
1323 // PART messages for one of these users would be incorrect.
1324 switch msg.Command {
1325 case "PRIVMSG", "NOTICE":
1326 return true
1327 }
1328 return false
1329}
1330
1331func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1332 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1333 return
1334 }
1335
1336 ch := net.channels.Value(target)
1337
1338 ctx, cancel := context.WithTimeout(context.TODO(), backlogTimeout)
1339 defer cancel()
1340
1341 targetCM := net.casemap(target)
1342 history, err := dc.user.msgStore.LoadLatestID(ctx, &net.Network, targetCM, msgID, backlogLimit)
1343 if err != nil {
1344 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1345 return
1346 }
1347
1348 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1349 for _, msg := range history {
1350 if ch != nil && ch.Detached {
1351 if net.detachedMessageNeedsRelay(ch, msg) {
1352 dc.relayDetachedMessage(net, msg)
1353 }
1354 } else {
1355 msg.Tags["batch"] = batchRef
1356 dc.SendMessage(dc.marshalMessage(msg, net))
1357 }
1358 }
1359 })
1360}
1361
1362func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1363 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1364 return
1365 }
1366
1367 sender := msg.Prefix.Name
1368 target, text := msg.Params[0], msg.Params[1]
1369 if net.isHighlight(msg) {
1370 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1371 } else {
1372 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1373 }
1374}
1375
1376func (dc *downstreamConn) runUntilRegistered() error {
1377 for !dc.registered {
1378 msg, err := dc.ReadMessage()
1379 if err != nil {
1380 return fmt.Errorf("failed to read IRC command: %w", err)
1381 }
1382
1383 err = dc.handleMessage(msg)
1384 if ircErr, ok := err.(ircError); ok {
1385 ircErr.Message.Prefix = dc.srv.prefix()
1386 dc.SendMessage(ircErr.Message)
1387 } else if err != nil {
1388 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1389 }
1390 }
1391
1392 return nil
1393}
1394
1395func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1396 ctx, cancel := context.WithTimeout(context.TODO(), handleDownstreamMessageTimeout)
1397 defer cancel()
1398
1399 switch msg.Command {
1400 case "CAP":
1401 var subCmd string
1402 if err := parseMessageParams(msg, &subCmd); err != nil {
1403 return err
1404 }
1405 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1406 return err
1407 }
1408 case "PING":
1409 var source, destination string
1410 if err := parseMessageParams(msg, &source); err != nil {
1411 return err
1412 }
1413 if len(msg.Params) > 1 {
1414 destination = msg.Params[1]
1415 }
1416 if destination != "" && destination != dc.srv.Hostname {
1417 return ircError{&irc.Message{
1418 Command: irc.ERR_NOSUCHSERVER,
1419 Params: []string{dc.nick, destination, "No such server"},
1420 }}
1421 }
1422 dc.SendMessage(&irc.Message{
1423 Prefix: dc.srv.prefix(),
1424 Command: "PONG",
1425 Params: []string{dc.srv.Hostname, source},
1426 })
1427 return nil
1428 case "PONG":
1429 if len(msg.Params) == 0 {
1430 return newNeedMoreParamsError(msg.Command)
1431 }
1432 token := msg.Params[len(msg.Params)-1]
1433 dc.handlePong(token)
1434 case "USER":
1435 return ircError{&irc.Message{
1436 Command: irc.ERR_ALREADYREGISTERED,
1437 Params: []string{dc.nick, "You may not reregister"},
1438 }}
1439 case "NICK":
1440 var rawNick string
1441 if err := parseMessageParams(msg, &rawNick); err != nil {
1442 return err
1443 }
1444
1445 nick := rawNick
1446 var upstream *upstreamConn
1447 if dc.upstream() == nil {
1448 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1449 if err == nil { // NICK nick/network: NICK only on a specific upstream
1450 upstream = uc
1451 nick = unmarshaledNick
1452 }
1453 }
1454
1455 if strings.ContainsAny(nick, illegalNickChars) {
1456 return ircError{&irc.Message{
1457 Command: irc.ERR_ERRONEUSNICKNAME,
1458 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1459 }}
1460 }
1461 if casemapASCII(nick) == serviceNickCM {
1462 return ircError{&irc.Message{
1463 Command: irc.ERR_NICKNAMEINUSE,
1464 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1465 }}
1466 }
1467
1468 var err error
1469 dc.forEachNetwork(func(n *network) {
1470 if err != nil || (upstream != nil && upstream.network != n) {
1471 return
1472 }
1473 n.Nick = nick
1474 err = dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network)
1475 })
1476 if err != nil {
1477 return err
1478 }
1479
1480 dc.forEachUpstream(func(uc *upstreamConn) {
1481 if upstream != nil && upstream != uc {
1482 return
1483 }
1484 uc.SendMessageLabeled(dc.id, &irc.Message{
1485 Command: "NICK",
1486 Params: []string{nick},
1487 })
1488 })
1489
1490 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1491 dc.SendMessage(&irc.Message{
1492 Prefix: dc.prefix(),
1493 Command: "NICK",
1494 Params: []string{nick},
1495 })
1496 dc.nick = nick
1497 dc.nickCM = casemapASCII(dc.nick)
1498 }
1499 case "SETNAME":
1500 var realname string
1501 if err := parseMessageParams(msg, &realname); err != nil {
1502 return err
1503 }
1504
1505 // If the client just resets to the default, just wipe the per-network
1506 // preference
1507 storeRealname := realname
1508 if realname == dc.user.Realname {
1509 storeRealname = ""
1510 }
1511
1512 var storeErr error
1513 var needUpdate []Network
1514 dc.forEachNetwork(func(n *network) {
1515 // We only need to call updateNetwork for upstreams that don't
1516 // support setname
1517 if uc := n.conn; uc != nil && uc.caps["setname"] {
1518 uc.SendMessageLabeled(dc.id, &irc.Message{
1519 Command: "SETNAME",
1520 Params: []string{realname},
1521 })
1522
1523 n.Realname = storeRealname
1524 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
1525 dc.logger.Printf("failed to store network realname: %v", err)
1526 storeErr = err
1527 }
1528 return
1529 }
1530
1531 record := n.Network // copy network record because we'll mutate it
1532 record.Realname = storeRealname
1533 needUpdate = append(needUpdate, record)
1534 })
1535
1536 // Walk the network list as a second step, because updateNetwork
1537 // mutates the original list
1538 for _, record := range needUpdate {
1539 if _, err := dc.user.updateNetwork(ctx, &record); err != nil {
1540 dc.logger.Printf("failed to update network realname: %v", err)
1541 storeErr = err
1542 }
1543 }
1544 if storeErr != nil {
1545 return ircError{&irc.Message{
1546 Command: "FAIL",
1547 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1548 }}
1549 }
1550
1551 if dc.upstream() == nil {
1552 dc.SendMessage(&irc.Message{
1553 Prefix: dc.prefix(),
1554 Command: "SETNAME",
1555 Params: []string{realname},
1556 })
1557 }
1558 case "JOIN":
1559 var namesStr string
1560 if err := parseMessageParams(msg, &namesStr); err != nil {
1561 return err
1562 }
1563
1564 var keys []string
1565 if len(msg.Params) > 1 {
1566 keys = strings.Split(msg.Params[1], ",")
1567 }
1568
1569 for i, name := range strings.Split(namesStr, ",") {
1570 uc, upstreamName, err := dc.unmarshalEntity(name)
1571 if err != nil {
1572 return err
1573 }
1574
1575 var key string
1576 if len(keys) > i {
1577 key = keys[i]
1578 }
1579
1580 if !uc.isChannel(upstreamName) {
1581 dc.SendMessage(&irc.Message{
1582 Prefix: dc.srv.prefix(),
1583 Command: irc.ERR_NOSUCHCHANNEL,
1584 Params: []string{name, "Not a channel name"},
1585 })
1586 continue
1587 }
1588
1589 params := []string{upstreamName}
1590 if key != "" {
1591 params = append(params, key)
1592 }
1593 uc.SendMessageLabeled(dc.id, &irc.Message{
1594 Command: "JOIN",
1595 Params: params,
1596 })
1597
1598 ch := uc.network.channels.Value(upstreamName)
1599 if ch != nil {
1600 // Don't clear the channel key if there's one set
1601 // TODO: add a way to unset the channel key
1602 if key != "" {
1603 ch.Key = key
1604 }
1605 uc.network.attach(ch)
1606 } else {
1607 ch = &Channel{
1608 Name: upstreamName,
1609 Key: key,
1610 }
1611 uc.network.channels.SetValue(upstreamName, ch)
1612 }
1613 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1614 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1615 }
1616 }
1617 case "PART":
1618 var namesStr string
1619 if err := parseMessageParams(msg, &namesStr); err != nil {
1620 return err
1621 }
1622
1623 var reason string
1624 if len(msg.Params) > 1 {
1625 reason = msg.Params[1]
1626 }
1627
1628 for _, name := range strings.Split(namesStr, ",") {
1629 uc, upstreamName, err := dc.unmarshalEntity(name)
1630 if err != nil {
1631 return err
1632 }
1633
1634 if strings.EqualFold(reason, "detach") {
1635 ch := uc.network.channels.Value(upstreamName)
1636 if ch != nil {
1637 uc.network.detach(ch)
1638 } else {
1639 ch = &Channel{
1640 Name: name,
1641 Detached: true,
1642 }
1643 uc.network.channels.SetValue(upstreamName, ch)
1644 }
1645 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1646 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1647 }
1648 } else {
1649 params := []string{upstreamName}
1650 if reason != "" {
1651 params = append(params, reason)
1652 }
1653 uc.SendMessageLabeled(dc.id, &irc.Message{
1654 Command: "PART",
1655 Params: params,
1656 })
1657
1658 if err := uc.network.deleteChannel(ctx, upstreamName); err != nil {
1659 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1660 }
1661 }
1662 }
1663 case "KICK":
1664 var channelStr, userStr string
1665 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1666 return err
1667 }
1668
1669 channels := strings.Split(channelStr, ",")
1670 users := strings.Split(userStr, ",")
1671
1672 var reason string
1673 if len(msg.Params) > 2 {
1674 reason = msg.Params[2]
1675 }
1676
1677 if len(channels) != 1 && len(channels) != len(users) {
1678 return ircError{&irc.Message{
1679 Command: irc.ERR_BADCHANMASK,
1680 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1681 }}
1682 }
1683
1684 for i, user := range users {
1685 var channel string
1686 if len(channels) == 1 {
1687 channel = channels[0]
1688 } else {
1689 channel = channels[i]
1690 }
1691
1692 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1693 if err != nil {
1694 return err
1695 }
1696
1697 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1698 if err != nil {
1699 return err
1700 }
1701
1702 if ucChannel != ucUser {
1703 return ircError{&irc.Message{
1704 Command: irc.ERR_USERNOTINCHANNEL,
1705 Params: []string{dc.nick, user, channel, "They are on another network"},
1706 }}
1707 }
1708 uc := ucChannel
1709
1710 params := []string{upstreamChannel, upstreamUser}
1711 if reason != "" {
1712 params = append(params, reason)
1713 }
1714 uc.SendMessageLabeled(dc.id, &irc.Message{
1715 Command: "KICK",
1716 Params: params,
1717 })
1718 }
1719 case "MODE":
1720 var name string
1721 if err := parseMessageParams(msg, &name); err != nil {
1722 return err
1723 }
1724
1725 var modeStr string
1726 if len(msg.Params) > 1 {
1727 modeStr = msg.Params[1]
1728 }
1729
1730 if casemapASCII(name) == dc.nickCM {
1731 if modeStr != "" {
1732 if uc := dc.upstream(); uc != nil {
1733 uc.SendMessageLabeled(dc.id, &irc.Message{
1734 Command: "MODE",
1735 Params: []string{uc.nick, modeStr},
1736 })
1737 } else {
1738 dc.SendMessage(&irc.Message{
1739 Prefix: dc.srv.prefix(),
1740 Command: irc.ERR_UMODEUNKNOWNFLAG,
1741 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1742 })
1743 }
1744 } else {
1745 var userMode string
1746 if uc := dc.upstream(); uc != nil {
1747 userMode = string(uc.modes)
1748 }
1749
1750 dc.SendMessage(&irc.Message{
1751 Prefix: dc.srv.prefix(),
1752 Command: irc.RPL_UMODEIS,
1753 Params: []string{dc.nick, "+" + userMode},
1754 })
1755 }
1756 return nil
1757 }
1758
1759 uc, upstreamName, err := dc.unmarshalEntity(name)
1760 if err != nil {
1761 return err
1762 }
1763
1764 if !uc.isChannel(upstreamName) {
1765 return ircError{&irc.Message{
1766 Command: irc.ERR_USERSDONTMATCH,
1767 Params: []string{dc.nick, "Cannot change mode for other users"},
1768 }}
1769 }
1770
1771 if modeStr != "" {
1772 params := []string{upstreamName, modeStr}
1773 params = append(params, msg.Params[2:]...)
1774 uc.SendMessageLabeled(dc.id, &irc.Message{
1775 Command: "MODE",
1776 Params: params,
1777 })
1778 } else {
1779 ch := uc.channels.Value(upstreamName)
1780 if ch == nil {
1781 return ircError{&irc.Message{
1782 Command: irc.ERR_NOSUCHCHANNEL,
1783 Params: []string{dc.nick, name, "No such channel"},
1784 }}
1785 }
1786
1787 if ch.modes == nil {
1788 // we haven't received the initial RPL_CHANNELMODEIS yet
1789 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1790 return nil
1791 }
1792
1793 modeStr, modeParams := ch.modes.Format()
1794 params := []string{dc.nick, name, modeStr}
1795 params = append(params, modeParams...)
1796
1797 dc.SendMessage(&irc.Message{
1798 Prefix: dc.srv.prefix(),
1799 Command: irc.RPL_CHANNELMODEIS,
1800 Params: params,
1801 })
1802 if ch.creationTime != "" {
1803 dc.SendMessage(&irc.Message{
1804 Prefix: dc.srv.prefix(),
1805 Command: rpl_creationtime,
1806 Params: []string{dc.nick, name, ch.creationTime},
1807 })
1808 }
1809 }
1810 case "TOPIC":
1811 var channel string
1812 if err := parseMessageParams(msg, &channel); err != nil {
1813 return err
1814 }
1815
1816 uc, upstreamName, err := dc.unmarshalEntity(channel)
1817 if err != nil {
1818 return err
1819 }
1820
1821 if len(msg.Params) > 1 { // setting topic
1822 topic := msg.Params[1]
1823 uc.SendMessageLabeled(dc.id, &irc.Message{
1824 Command: "TOPIC",
1825 Params: []string{upstreamName, topic},
1826 })
1827 } else { // getting topic
1828 ch := uc.channels.Value(upstreamName)
1829 if ch == nil {
1830 return ircError{&irc.Message{
1831 Command: irc.ERR_NOSUCHCHANNEL,
1832 Params: []string{dc.nick, upstreamName, "No such channel"},
1833 }}
1834 }
1835 sendTopic(dc, ch)
1836 }
1837 case "LIST":
1838 // TODO: support ELIST when supported by all upstreams
1839
1840 pl := pendingLIST{
1841 downstreamID: dc.id,
1842 pendingCommands: make(map[int64]*irc.Message),
1843 }
1844 var upstream *upstreamConn
1845 var upstreamChannels map[int64][]string
1846 if len(msg.Params) > 0 {
1847 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1848 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1849 upstream = uc
1850 } else {
1851 upstreamChannels = make(map[int64][]string)
1852 channels := strings.Split(msg.Params[0], ",")
1853 for _, channel := range channels {
1854 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1855 if err != nil {
1856 return err
1857 }
1858 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1859 }
1860 }
1861 }
1862
1863 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1864 dc.forEachUpstream(func(uc *upstreamConn) {
1865 if upstream != nil && upstream != uc {
1866 return
1867 }
1868 var params []string
1869 if upstreamChannels != nil {
1870 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1871 params = []string{strings.Join(channels, ",")}
1872 } else {
1873 return
1874 }
1875 }
1876 pl.pendingCommands[uc.network.ID] = &irc.Message{
1877 Command: "LIST",
1878 Params: params,
1879 }
1880 uc.trySendLIST(dc.id)
1881 })
1882 case "NAMES":
1883 if len(msg.Params) == 0 {
1884 dc.SendMessage(&irc.Message{
1885 Prefix: dc.srv.prefix(),
1886 Command: irc.RPL_ENDOFNAMES,
1887 Params: []string{dc.nick, "*", "End of /NAMES list"},
1888 })
1889 return nil
1890 }
1891
1892 channels := strings.Split(msg.Params[0], ",")
1893 for _, channel := range channels {
1894 uc, upstreamName, err := dc.unmarshalEntity(channel)
1895 if err != nil {
1896 return err
1897 }
1898
1899 ch := uc.channels.Value(upstreamName)
1900 if ch != nil {
1901 sendNames(dc, ch)
1902 } else {
1903 // NAMES on a channel we have not joined, ask upstream
1904 uc.SendMessageLabeled(dc.id, &irc.Message{
1905 Command: "NAMES",
1906 Params: []string{upstreamName},
1907 })
1908 }
1909 }
1910 // For WHOX docs, see:
1911 // - http://faerion.sourceforge.net/doc/irc/whox.var
1912 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1913 // Note, many features aren't widely implemented, such as flags and mask2
1914 case "WHO":
1915 if len(msg.Params) == 0 {
1916 // TODO: support WHO without parameters
1917 dc.SendMessage(&irc.Message{
1918 Prefix: dc.srv.prefix(),
1919 Command: irc.RPL_ENDOFWHO,
1920 Params: []string{dc.nick, "*", "End of /WHO list"},
1921 })
1922 return nil
1923 }
1924
1925 // Clients will use the first mask to match RPL_ENDOFWHO
1926 endOfWhoToken := msg.Params[0]
1927
1928 // TODO: add support for WHOX mask2
1929 mask := msg.Params[0]
1930 var options string
1931 if len(msg.Params) > 1 {
1932 options = msg.Params[1]
1933 }
1934
1935 optionsParts := strings.SplitN(options, "%", 2)
1936 // TODO: add support for WHOX flags in optionsParts[0]
1937 var fields, whoxToken string
1938 if len(optionsParts) == 2 {
1939 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1940 fields = strings.ToLower(optionsParts[0])
1941 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1942 whoxToken = optionsParts[1]
1943 }
1944 }
1945
1946 // TODO: support mixed bouncer/upstream WHO queries
1947 maskCM := casemapASCII(mask)
1948 if dc.network == nil && maskCM == dc.nickCM {
1949 // TODO: support AWAY (H/G) in self WHO reply
1950 flags := "H"
1951 if dc.user.Admin {
1952 flags += "*"
1953 }
1954 info := whoxInfo{
1955 Token: whoxToken,
1956 Username: dc.user.Username,
1957 Hostname: dc.hostname,
1958 Server: dc.srv.Hostname,
1959 Nickname: dc.nick,
1960 Flags: flags,
1961 Account: dc.user.Username,
1962 Realname: dc.realname,
1963 }
1964 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1965 dc.SendMessage(&irc.Message{
1966 Prefix: dc.srv.prefix(),
1967 Command: irc.RPL_ENDOFWHO,
1968 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1969 })
1970 return nil
1971 }
1972 if maskCM == serviceNickCM {
1973 info := whoxInfo{
1974 Token: whoxToken,
1975 Username: servicePrefix.User,
1976 Hostname: servicePrefix.Host,
1977 Server: dc.srv.Hostname,
1978 Nickname: serviceNick,
1979 Flags: "H*",
1980 Account: serviceNick,
1981 Realname: serviceRealname,
1982 }
1983 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1984 dc.SendMessage(&irc.Message{
1985 Prefix: dc.srv.prefix(),
1986 Command: irc.RPL_ENDOFWHO,
1987 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1988 })
1989 return nil
1990 }
1991
1992 // TODO: properly support WHO masks
1993 uc, upstreamMask, err := dc.unmarshalEntity(mask)
1994 if err != nil {
1995 return err
1996 }
1997
1998 params := []string{upstreamMask}
1999 if options != "" {
2000 params = append(params, options)
2001 }
2002
2003 uc.SendMessageLabeled(dc.id, &irc.Message{
2004 Command: "WHO",
2005 Params: params,
2006 })
2007 case "WHOIS":
2008 if len(msg.Params) == 0 {
2009 return ircError{&irc.Message{
2010 Command: irc.ERR_NONICKNAMEGIVEN,
2011 Params: []string{dc.nick, "No nickname given"},
2012 }}
2013 }
2014
2015 var target, mask string
2016 if len(msg.Params) == 1 {
2017 target = ""
2018 mask = msg.Params[0]
2019 } else {
2020 target = msg.Params[0]
2021 mask = msg.Params[1]
2022 }
2023 // TODO: support multiple WHOIS users
2024 if i := strings.IndexByte(mask, ','); i >= 0 {
2025 mask = mask[:i]
2026 }
2027
2028 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2029 dc.SendMessage(&irc.Message{
2030 Prefix: dc.srv.prefix(),
2031 Command: irc.RPL_WHOISUSER,
2032 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2033 })
2034 dc.SendMessage(&irc.Message{
2035 Prefix: dc.srv.prefix(),
2036 Command: irc.RPL_WHOISSERVER,
2037 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
2038 })
2039 if dc.user.Admin {
2040 dc.SendMessage(&irc.Message{
2041 Prefix: dc.srv.prefix(),
2042 Command: irc.RPL_WHOISOPERATOR,
2043 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2044 })
2045 }
2046 dc.SendMessage(&irc.Message{
2047 Prefix: dc.srv.prefix(),
2048 Command: rpl_whoisaccount,
2049 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2050 })
2051 dc.SendMessage(&irc.Message{
2052 Prefix: dc.srv.prefix(),
2053 Command: irc.RPL_ENDOFWHOIS,
2054 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2055 })
2056 return nil
2057 }
2058 if casemapASCII(mask) == serviceNickCM {
2059 dc.SendMessage(&irc.Message{
2060 Prefix: dc.srv.prefix(),
2061 Command: irc.RPL_WHOISUSER,
2062 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2063 })
2064 dc.SendMessage(&irc.Message{
2065 Prefix: dc.srv.prefix(),
2066 Command: irc.RPL_WHOISSERVER,
2067 Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
2068 })
2069 dc.SendMessage(&irc.Message{
2070 Prefix: dc.srv.prefix(),
2071 Command: irc.RPL_WHOISOPERATOR,
2072 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2073 })
2074 dc.SendMessage(&irc.Message{
2075 Prefix: dc.srv.prefix(),
2076 Command: rpl_whoisaccount,
2077 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2078 })
2079 dc.SendMessage(&irc.Message{
2080 Prefix: dc.srv.prefix(),
2081 Command: irc.RPL_ENDOFWHOIS,
2082 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2083 })
2084 return nil
2085 }
2086
2087 // TODO: support WHOIS masks
2088 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2089 if err != nil {
2090 return err
2091 }
2092
2093 var params []string
2094 if target != "" {
2095 if target == mask { // WHOIS nick nick
2096 params = []string{upstreamNick, upstreamNick}
2097 } else {
2098 params = []string{target, upstreamNick}
2099 }
2100 } else {
2101 params = []string{upstreamNick}
2102 }
2103
2104 uc.SendMessageLabeled(dc.id, &irc.Message{
2105 Command: "WHOIS",
2106 Params: params,
2107 })
2108 case "PRIVMSG", "NOTICE":
2109 var targetsStr, text string
2110 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2111 return err
2112 }
2113 tags := copyClientTags(msg.Tags)
2114
2115 for _, name := range strings.Split(targetsStr, ",") {
2116 if name == "$"+dc.srv.Hostname || (name == "$*" && dc.network == nil) {
2117 // "$" means a server mask follows. If it's the bouncer's
2118 // hostname, broadcast the message to all bouncer users.
2119 if !dc.user.Admin {
2120 return ircError{&irc.Message{
2121 Prefix: dc.srv.prefix(),
2122 Command: irc.ERR_BADMASK,
2123 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2124 }}
2125 }
2126
2127 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2128
2129 broadcastTags := tags.Copy()
2130 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2131 broadcastMsg := &irc.Message{
2132 Tags: broadcastTags,
2133 Prefix: servicePrefix,
2134 Command: msg.Command,
2135 Params: []string{name, text},
2136 }
2137 dc.srv.forEachUser(func(u *user) {
2138 u.events <- eventBroadcast{broadcastMsg}
2139 })
2140 continue
2141 }
2142
2143 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2144 dc.SendMessage(&irc.Message{
2145 Tags: msg.Tags.Copy(),
2146 Prefix: dc.prefix(),
2147 Command: msg.Command,
2148 Params: []string{name, text},
2149 })
2150 continue
2151 }
2152
2153 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2154 if dc.caps["echo-message"] {
2155 echoTags := tags.Copy()
2156 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2157 dc.SendMessage(&irc.Message{
2158 Tags: echoTags,
2159 Prefix: dc.prefix(),
2160 Command: msg.Command,
2161 Params: []string{name, text},
2162 })
2163 }
2164 handleServicePRIVMSG(ctx, dc, text)
2165 continue
2166 }
2167
2168 uc, upstreamName, err := dc.unmarshalEntity(name)
2169 if err != nil {
2170 return err
2171 }
2172
2173 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2174 dc.handleNickServPRIVMSG(ctx, uc, text)
2175 }
2176
2177 unmarshaledText := text
2178 if uc.isChannel(upstreamName) {
2179 unmarshaledText = dc.unmarshalText(uc, text)
2180 }
2181 uc.SendMessageLabeled(dc.id, &irc.Message{
2182 Tags: tags,
2183 Command: msg.Command,
2184 Params: []string{upstreamName, unmarshaledText},
2185 })
2186
2187 echoTags := tags.Copy()
2188 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2189 if uc.account != "" {
2190 echoTags["account"] = irc.TagValue(uc.account)
2191 }
2192 echoMsg := &irc.Message{
2193 Tags: echoTags,
2194 Prefix: &irc.Prefix{
2195 Name: uc.nick,
2196 User: uc.username,
2197 },
2198 Command: msg.Command,
2199 Params: []string{upstreamName, text},
2200 }
2201 uc.produce(upstreamName, echoMsg, dc)
2202
2203 uc.updateChannelAutoDetach(upstreamName)
2204 }
2205 case "TAGMSG":
2206 var targetsStr string
2207 if err := parseMessageParams(msg, &targetsStr); err != nil {
2208 return err
2209 }
2210 tags := copyClientTags(msg.Tags)
2211
2212 for _, name := range strings.Split(targetsStr, ",") {
2213 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2214 dc.SendMessage(&irc.Message{
2215 Tags: msg.Tags.Copy(),
2216 Prefix: dc.prefix(),
2217 Command: "TAGMSG",
2218 Params: []string{name},
2219 })
2220 continue
2221 }
2222
2223 if casemapASCII(name) == serviceNickCM {
2224 continue
2225 }
2226
2227 uc, upstreamName, err := dc.unmarshalEntity(name)
2228 if err != nil {
2229 return err
2230 }
2231 if _, ok := uc.caps["message-tags"]; !ok {
2232 continue
2233 }
2234
2235 uc.SendMessageLabeled(dc.id, &irc.Message{
2236 Tags: tags,
2237 Command: "TAGMSG",
2238 Params: []string{upstreamName},
2239 })
2240
2241 uc.updateChannelAutoDetach(upstreamName)
2242 }
2243 case "INVITE":
2244 var user, channel string
2245 if err := parseMessageParams(msg, &user, &channel); err != nil {
2246 return err
2247 }
2248
2249 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2250 if err != nil {
2251 return err
2252 }
2253
2254 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2255 if err != nil {
2256 return err
2257 }
2258
2259 if ucChannel != ucUser {
2260 return ircError{&irc.Message{
2261 Command: irc.ERR_USERNOTINCHANNEL,
2262 Params: []string{dc.nick, user, channel, "They are on another network"},
2263 }}
2264 }
2265 uc := ucChannel
2266
2267 uc.SendMessageLabeled(dc.id, &irc.Message{
2268 Command: "INVITE",
2269 Params: []string{upstreamUser, upstreamChannel},
2270 })
2271 case "CHATHISTORY":
2272 var subcommand string
2273 if err := parseMessageParams(msg, &subcommand); err != nil {
2274 return err
2275 }
2276 var target, limitStr string
2277 var boundsStr [2]string
2278 switch subcommand {
2279 case "AFTER", "BEFORE":
2280 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2281 return err
2282 }
2283 case "BETWEEN":
2284 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2285 return err
2286 }
2287 case "TARGETS":
2288 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2289 return err
2290 }
2291 default:
2292 // TODO: support LATEST, AROUND
2293 return ircError{&irc.Message{
2294 Command: "FAIL",
2295 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2296 }}
2297 }
2298
2299 // We don't save history for our service
2300 if casemapASCII(target) == serviceNickCM {
2301 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2302 return nil
2303 }
2304
2305 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2306 if !ok {
2307 return ircError{&irc.Message{
2308 Command: irc.ERR_UNKNOWNCOMMAND,
2309 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2310 }}
2311 }
2312
2313 network, entity, err := dc.unmarshalEntityNetwork(target)
2314 if err != nil {
2315 return err
2316 }
2317 entity = network.casemap(entity)
2318
2319 // TODO: support msgid criteria
2320 var bounds [2]time.Time
2321 bounds[0] = parseChatHistoryBound(boundsStr[0])
2322 if bounds[0].IsZero() {
2323 return ircError{&irc.Message{
2324 Command: "FAIL",
2325 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2326 }}
2327 }
2328
2329 if boundsStr[1] != "" {
2330 bounds[1] = parseChatHistoryBound(boundsStr[1])
2331 if bounds[1].IsZero() {
2332 return ircError{&irc.Message{
2333 Command: "FAIL",
2334 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2335 }}
2336 }
2337 }
2338
2339 limit, err := strconv.Atoi(limitStr)
2340 if err != nil || limit < 0 || limit > chatHistoryLimit {
2341 return ircError{&irc.Message{
2342 Command: "FAIL",
2343 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2344 }}
2345 }
2346
2347 eventPlayback := dc.caps["draft/event-playback"]
2348
2349 var history []*irc.Message
2350 switch subcommand {
2351 case "BEFORE":
2352 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], time.Time{}, limit, eventPlayback)
2353 case "AFTER":
2354 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], time.Now(), limit, eventPlayback)
2355 case "BETWEEN":
2356 if bounds[0].Before(bounds[1]) {
2357 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2358 } else {
2359 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2360 }
2361 case "TARGETS":
2362 // TODO: support TARGETS in multi-upstream mode
2363 targets, err := store.ListTargets(ctx, &network.Network, bounds[0], bounds[1], limit, eventPlayback)
2364 if err != nil {
2365 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2366 return ircError{&irc.Message{
2367 Command: "FAIL",
2368 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2369 }}
2370 }
2371
2372 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2373 for _, target := range targets {
2374 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2375 continue
2376 }
2377
2378 dc.SendMessage(&irc.Message{
2379 Tags: irc.Tags{"batch": batchRef},
2380 Prefix: dc.srv.prefix(),
2381 Command: "CHATHISTORY",
2382 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2383 })
2384 }
2385 })
2386
2387 return nil
2388 }
2389 if err != nil {
2390 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2391 return newChatHistoryError(subcommand, target)
2392 }
2393
2394 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2395 for _, msg := range history {
2396 msg.Tags["batch"] = batchRef
2397 dc.SendMessage(dc.marshalMessage(msg, network))
2398 }
2399 })
2400 case "BOUNCER":
2401 var subcommand string
2402 if err := parseMessageParams(msg, &subcommand); err != nil {
2403 return err
2404 }
2405
2406 switch strings.ToUpper(subcommand) {
2407 case "BIND":
2408 return ircError{&irc.Message{
2409 Command: "FAIL",
2410 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2411 }}
2412 case "LISTNETWORKS":
2413 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2414 dc.user.forEachNetwork(func(network *network) {
2415 idStr := fmt.Sprintf("%v", network.ID)
2416 attrs := getNetworkAttrs(network)
2417 dc.SendMessage(&irc.Message{
2418 Tags: irc.Tags{"batch": batchRef},
2419 Prefix: dc.srv.prefix(),
2420 Command: "BOUNCER",
2421 Params: []string{"NETWORK", idStr, attrs.String()},
2422 })
2423 })
2424 })
2425 case "ADDNETWORK":
2426 var attrsStr string
2427 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2428 return err
2429 }
2430 attrs := irc.ParseTags(attrsStr)
2431
2432 record := &Network{Nick: dc.nick, Enabled: true}
2433 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2434 return err
2435 }
2436
2437 if record.Nick == dc.user.Username {
2438 record.Nick = ""
2439 }
2440 if record.Realname == dc.user.Realname {
2441 record.Realname = ""
2442 }
2443
2444 network, err := dc.user.createNetwork(ctx, record)
2445 if err != nil {
2446 return ircError{&irc.Message{
2447 Command: "FAIL",
2448 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2449 }}
2450 }
2451
2452 dc.SendMessage(&irc.Message{
2453 Prefix: dc.srv.prefix(),
2454 Command: "BOUNCER",
2455 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2456 })
2457 case "CHANGENETWORK":
2458 var idStr, attrsStr string
2459 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2460 return err
2461 }
2462 id, err := parseBouncerNetID(subcommand, idStr)
2463 if err != nil {
2464 return err
2465 }
2466 attrs := irc.ParseTags(attrsStr)
2467
2468 net := dc.user.getNetworkByID(id)
2469 if net == nil {
2470 return ircError{&irc.Message{
2471 Command: "FAIL",
2472 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2473 }}
2474 }
2475
2476 record := net.Network // copy network record because we'll mutate it
2477 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2478 return err
2479 }
2480
2481 if record.Nick == dc.user.Username {
2482 record.Nick = ""
2483 }
2484 if record.Realname == dc.user.Realname {
2485 record.Realname = ""
2486 }
2487
2488 _, err = dc.user.updateNetwork(ctx, &record)
2489 if err != nil {
2490 return ircError{&irc.Message{
2491 Command: "FAIL",
2492 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2493 }}
2494 }
2495
2496 dc.SendMessage(&irc.Message{
2497 Prefix: dc.srv.prefix(),
2498 Command: "BOUNCER",
2499 Params: []string{"CHANGENETWORK", idStr},
2500 })
2501 case "DELNETWORK":
2502 var idStr string
2503 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2504 return err
2505 }
2506 id, err := parseBouncerNetID(subcommand, idStr)
2507 if err != nil {
2508 return err
2509 }
2510
2511 net := dc.user.getNetworkByID(id)
2512 if net == nil {
2513 return ircError{&irc.Message{
2514 Command: "FAIL",
2515 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2516 }}
2517 }
2518
2519 if err := dc.user.deleteNetwork(ctx, net.ID); err != nil {
2520 return err
2521 }
2522
2523 dc.SendMessage(&irc.Message{
2524 Prefix: dc.srv.prefix(),
2525 Command: "BOUNCER",
2526 Params: []string{"DELNETWORK", idStr},
2527 })
2528 default:
2529 return ircError{&irc.Message{
2530 Command: "FAIL",
2531 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2532 }}
2533 }
2534 default:
2535 dc.logger.Printf("unhandled message: %v", msg)
2536
2537 // Only forward unknown commands in single-upstream mode
2538 uc := dc.upstream()
2539 if uc == nil {
2540 return newUnknownCommandError(msg.Command)
2541 }
2542
2543 uc.SendMessageLabeled(dc.id, msg)
2544 }
2545 return nil
2546}
2547
2548func (dc *downstreamConn) handleNickServPRIVMSG(ctx context.Context, uc *upstreamConn, text string) {
2549 username, password, ok := parseNickServCredentials(text, uc.nick)
2550 if !ok {
2551 return
2552 }
2553
2554 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2555 // automatically erase the key pair or any other credentials.
2556 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2557 return
2558 }
2559
2560 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2561 n := uc.network
2562 n.SASL.Mechanism = "PLAIN"
2563 n.SASL.Plain.Username = username
2564 n.SASL.Plain.Password = password
2565 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
2566 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2567 }
2568}
2569
2570func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2571 fields := strings.Fields(text)
2572 if len(fields) < 2 {
2573 return "", "", false
2574 }
2575 cmd := strings.ToUpper(fields[0])
2576 params := fields[1:]
2577 switch cmd {
2578 case "REGISTER":
2579 username = nick
2580 password = params[0]
2581 case "IDENTIFY":
2582 if len(params) == 1 {
2583 username = nick
2584 password = params[0]
2585 } else {
2586 username = params[0]
2587 password = params[1]
2588 }
2589 case "SET":
2590 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2591 username = nick
2592 password = params[1]
2593 }
2594 default:
2595 return "", "", false
2596 }
2597 return username, password, true
2598}
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