source: code/trunk/downstream.go@ 698

Last change on this file since 698 was 698, checked in by contact, 4 years ago

Add context arg to sanityCheckServer

As a bonus, the timeout now applies to the whole TLS dial
operation. Before the timeout only applied to the net dial
operation, making it possible for a bad server to stall the request
by making the TLS handshake extremely slow.
File size: 68.0 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 "draft/extended-monitor": "",
210}
211
212// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
213// through from the upstream server to downstream clients.
214//
215// This is only effective in single-upstream mode.
216var passthroughIsupport = map[string]bool{
217 "AWAYLEN": true,
218 "BOT": true,
219 "CHANLIMIT": true,
220 "CHANMODES": true,
221 "CHANNELLEN": true,
222 "CHANTYPES": true,
223 "CLIENTTAGDENY": true,
224 "ELIST": true,
225 "EXCEPTS": true,
226 "EXTBAN": true,
227 "HOSTLEN": true,
228 "INVEX": true,
229 "KICKLEN": true,
230 "MAXLIST": true,
231 "MAXTARGETS": true,
232 "MODES": true,
233 "MONITOR": true,
234 "NAMELEN": true,
235 "NETWORK": true,
236 "NICKLEN": true,
237 "PREFIX": true,
238 "SAFELIST": true,
239 "TARGMAX": true,
240 "TOPICLEN": true,
241 "USERLEN": true,
242 "UTF8ONLY": true,
243 "WHOX": true,
244}
245
246type downstreamConn struct {
247 conn
248
249 id uint64
250
251 registered bool
252 user *user
253 nick string
254 nickCM string
255 rawUsername string
256 networkName string
257 clientName string
258 realname string
259 hostname string
260 password string // empty after authentication
261 network *network // can be nil
262 isMultiUpstream bool
263
264 negotiatingCaps bool
265 capVersion int
266 supportedCaps map[string]string
267 caps map[string]bool
268
269 lastBatchRef uint64
270
271 monitored casemapMap
272
273 saslServer sasl.Server
274}
275
276func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
277 remoteAddr := ic.RemoteAddr().String()
278 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
279 options := connOptions{Logger: logger}
280 dc := &downstreamConn{
281 conn: *newConn(srv, ic, &options),
282 id: id,
283 supportedCaps: make(map[string]string),
284 caps: make(map[string]bool),
285 monitored: newCasemapMap(0),
286 }
287 dc.hostname = remoteAddr
288 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
289 dc.hostname = host
290 }
291 for k, v := range permanentDownstreamCaps {
292 dc.supportedCaps[k] = v
293 }
294 // TODO: this is racy, we should only enable chathistory after
295 // authentication and then check that user.msgStore implements
296 // chatHistoryMessageStore
297 if srv.Config().LogPath != "" {
298 dc.supportedCaps["draft/chathistory"] = ""
299 }
300 return dc
301}
302
303func (dc *downstreamConn) prefix() *irc.Prefix {
304 return &irc.Prefix{
305 Name: dc.nick,
306 User: dc.user.Username,
307 Host: dc.hostname,
308 }
309}
310
311func (dc *downstreamConn) forEachNetwork(f func(*network)) {
312 if dc.network != nil {
313 f(dc.network)
314 } else if dc.isMultiUpstream {
315 dc.user.forEachNetwork(f)
316 }
317}
318
319func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
320 if dc.network == nil && !dc.isMultiUpstream {
321 return
322 }
323 dc.user.forEachUpstream(func(uc *upstreamConn) {
324 if dc.network != nil && uc.network != dc.network {
325 return
326 }
327 f(uc)
328 })
329}
330
331// upstream returns the upstream connection, if any. If there are zero or if
332// there are multiple upstream connections, it returns nil.
333func (dc *downstreamConn) upstream() *upstreamConn {
334 if dc.network == nil {
335 return nil
336 }
337 return dc.network.conn
338}
339
340func isOurNick(net *network, nick string) bool {
341 // TODO: this doesn't account for nick changes
342 if net.conn != nil {
343 return net.casemap(nick) == net.conn.nickCM
344 }
345 // We're not currently connected to the upstream connection, so we don't
346 // know whether this name is our nickname. Best-effort: use the network's
347 // configured nickname and hope it was the one being used when we were
348 // connected.
349 return net.casemap(nick) == net.casemap(GetNick(&net.user.User, &net.Network))
350}
351
352// marshalEntity converts an upstream entity name (ie. channel or nick) into a
353// downstream entity name.
354//
355// This involves adding a "/<network>" suffix if the entity isn't the current
356// user.
357func (dc *downstreamConn) marshalEntity(net *network, name string) string {
358 if isOurNick(net, name) {
359 return dc.nick
360 }
361 name = partialCasemap(net.casemap, name)
362 if dc.network != nil {
363 if dc.network != net {
364 panic("soju: tried to marshal an entity for another network")
365 }
366 return name
367 }
368 return name + "/" + net.GetName()
369}
370
371func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
372 if isOurNick(net, prefix.Name) {
373 return dc.prefix()
374 }
375 prefix.Name = partialCasemap(net.casemap, prefix.Name)
376 if dc.network != nil {
377 if dc.network != net {
378 panic("soju: tried to marshal a user prefix for another network")
379 }
380 return prefix
381 }
382 return &irc.Prefix{
383 Name: prefix.Name + "/" + net.GetName(),
384 User: prefix.User,
385 Host: prefix.Host,
386 }
387}
388
389// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
390// nick) into an upstream entity name.
391//
392// This involves removing the "/<network>" suffix.
393func (dc *downstreamConn) unmarshalEntityNetwork(name string) (*network, string, error) {
394 if dc.network != nil {
395 return dc.network, name, nil
396 }
397
398 var net *network
399 if i := strings.LastIndexByte(name, '/'); i >= 0 {
400 network := name[i+1:]
401 name = name[:i]
402
403 for _, n := range dc.user.networks {
404 if network == n.GetName() {
405 net = n
406 break
407 }
408 }
409 }
410
411 if net == nil {
412 return nil, "", ircError{&irc.Message{
413 Command: irc.ERR_NOSUCHCHANNEL,
414 Params: []string{name, "Missing network suffix in name"},
415 }}
416 }
417
418 return net, name, nil
419}
420
421// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
422// upstream connection and fails if the upstream is disconnected.
423func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
424 net, name, err := dc.unmarshalEntityNetwork(name)
425 if err != nil {
426 return nil, "", err
427 }
428
429 if net.conn == nil {
430 return nil, "", ircError{&irc.Message{
431 Command: irc.ERR_NOSUCHCHANNEL,
432 Params: []string{name, "Disconnected from upstream network"},
433 }}
434 }
435
436 return net.conn, name, nil
437}
438
439func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
440 if dc.upstream() != nil {
441 return text
442 }
443 // TODO: smarter parsing that ignores URLs
444 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
445}
446
447func (dc *downstreamConn) readMessages(ch chan<- event) error {
448 for {
449 msg, err := dc.ReadMessage()
450 if errors.Is(err, io.EOF) {
451 break
452 } else if err != nil {
453 return fmt.Errorf("failed to read IRC command: %v", err)
454 }
455
456 ch <- eventDownstreamMessage{msg, dc}
457 }
458
459 return nil
460}
461
462// SendMessage sends an outgoing message.
463//
464// This can only called from the user goroutine.
465func (dc *downstreamConn) SendMessage(msg *irc.Message) {
466 if !dc.caps["message-tags"] {
467 if msg.Command == "TAGMSG" {
468 return
469 }
470 msg = msg.Copy()
471 for name := range msg.Tags {
472 supported := false
473 switch name {
474 case "time":
475 supported = dc.caps["server-time"]
476 case "account":
477 supported = dc.caps["account"]
478 }
479 if !supported {
480 delete(msg.Tags, name)
481 }
482 }
483 }
484 if !dc.caps["batch"] && msg.Tags["batch"] != "" {
485 msg = msg.Copy()
486 delete(msg.Tags, "batch")
487 }
488 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
489 msg.Params = msg.Params[:1]
490 }
491 if msg.Command == "SETNAME" && !dc.caps["setname"] {
492 return
493 }
494 if msg.Command == "AWAY" && !dc.caps["away-notify"] {
495 return
496 }
497 if msg.Command == "ACCOUNT" && !dc.caps["account-notify"] {
498 return
499 }
500
501 dc.conn.SendMessage(msg)
502}
503
504func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
505 dc.lastBatchRef++
506 ref := fmt.Sprintf("%v", dc.lastBatchRef)
507
508 if dc.caps["batch"] {
509 dc.SendMessage(&irc.Message{
510 Tags: tags,
511 Prefix: dc.srv.prefix(),
512 Command: "BATCH",
513 Params: append([]string{"+" + ref, typ}, params...),
514 })
515 }
516
517 f(irc.TagValue(ref))
518
519 if dc.caps["batch"] {
520 dc.SendMessage(&irc.Message{
521 Prefix: dc.srv.prefix(),
522 Command: "BATCH",
523 Params: []string{"-" + ref},
524 })
525 }
526}
527
528// sendMessageWithID sends an outgoing message with the specified internal ID.
529func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
530 dc.SendMessage(msg)
531
532 if id == "" || !dc.messageSupportsBacklog(msg) {
533 return
534 }
535
536 dc.sendPing(id)
537}
538
539// advanceMessageWithID advances history to the specified message ID without
540// sending a message. This is useful e.g. for self-messages when echo-message
541// isn't enabled.
542func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
543 if id == "" || !dc.messageSupportsBacklog(msg) {
544 return
545 }
546
547 dc.sendPing(id)
548}
549
550// ackMsgID acknowledges that a message has been received.
551func (dc *downstreamConn) ackMsgID(id string) {
552 netID, entity, err := parseMsgID(id, nil)
553 if err != nil {
554 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
555 return
556 }
557
558 network := dc.user.getNetworkByID(netID)
559 if network == nil {
560 return
561 }
562
563 network.delivered.StoreID(entity, dc.clientName, id)
564}
565
566func (dc *downstreamConn) sendPing(msgID string) {
567 token := "soju-msgid-" + msgID
568 dc.SendMessage(&irc.Message{
569 Command: "PING",
570 Params: []string{token},
571 })
572}
573
574func (dc *downstreamConn) handlePong(token string) {
575 if !strings.HasPrefix(token, "soju-msgid-") {
576 dc.logger.Printf("received unrecognized PONG token %q", token)
577 return
578 }
579 msgID := strings.TrimPrefix(token, "soju-msgid-")
580 dc.ackMsgID(msgID)
581}
582
583// marshalMessage re-formats a message coming from an upstream connection so
584// that it's suitable for being sent on this downstream connection. Only
585// messages that may appear in logs are supported, except MODE messages which
586// may only appear in single-upstream mode.
587func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
588 msg = msg.Copy()
589 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
590
591 if dc.network != nil {
592 return msg
593 }
594
595 switch msg.Command {
596 case "PRIVMSG", "NOTICE", "TAGMSG":
597 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
598 case "NICK":
599 // Nick change for another user
600 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
601 case "JOIN", "PART":
602 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
603 case "KICK":
604 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
605 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
606 case "TOPIC":
607 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
608 case "QUIT", "SETNAME":
609 // This space is intentionally left blank
610 default:
611 panic(fmt.Sprintf("unexpected %q message", msg.Command))
612 }
613
614 return msg
615}
616
617func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
618 switch msg.Command {
619 case "QUIT":
620 return dc.Close()
621 default:
622 if dc.registered {
623 return dc.handleMessageRegistered(msg)
624 } else {
625 return dc.handleMessageUnregistered(msg)
626 }
627 }
628}
629
630func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
631 switch msg.Command {
632 case "NICK":
633 var nick string
634 if err := parseMessageParams(msg, &nick); err != nil {
635 return err
636 }
637 if strings.ContainsAny(nick, illegalNickChars) {
638 return ircError{&irc.Message{
639 Command: irc.ERR_ERRONEUSNICKNAME,
640 Params: []string{dc.nick, nick, "contains illegal characters"},
641 }}
642 }
643 nickCM := casemapASCII(nick)
644 if nickCM == serviceNickCM {
645 return ircError{&irc.Message{
646 Command: irc.ERR_NICKNAMEINUSE,
647 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
648 }}
649 }
650 dc.nick = nick
651 dc.nickCM = nickCM
652 case "USER":
653 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
654 return err
655 }
656 case "PASS":
657 if err := parseMessageParams(msg, &dc.password); err != nil {
658 return err
659 }
660 case "CAP":
661 var subCmd string
662 if err := parseMessageParams(msg, &subCmd); err != nil {
663 return err
664 }
665 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
666 return err
667 }
668 case "AUTHENTICATE":
669 if !dc.caps["sasl"] {
670 return ircError{&irc.Message{
671 Command: irc.ERR_SASLFAIL,
672 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
673 }}
674 }
675 if len(msg.Params) == 0 {
676 return ircError{&irc.Message{
677 Command: irc.ERR_SASLFAIL,
678 Params: []string{"*", "Missing AUTHENTICATE argument"},
679 }}
680 }
681 if dc.nick == "" {
682 return ircError{&irc.Message{
683 Command: irc.ERR_SASLFAIL,
684 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
685 }}
686 }
687
688 var resp []byte
689 if msg.Params[0] == "*" {
690 dc.saslServer = nil
691 return ircError{&irc.Message{
692 Command: irc.ERR_SASLABORTED,
693 Params: []string{"*", "SASL authentication aborted"},
694 }}
695 } else if dc.saslServer == nil {
696 mech := strings.ToUpper(msg.Params[0])
697 switch mech {
698 case "PLAIN":
699 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
700 return dc.authenticate(username, password)
701 }))
702 default:
703 return ircError{&irc.Message{
704 Command: irc.ERR_SASLFAIL,
705 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
706 }}
707 }
708 } else if msg.Params[0] == "+" {
709 resp = nil
710 } else {
711 // TODO: multi-line messages
712 var err error
713 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
714 if err != nil {
715 dc.saslServer = nil
716 return ircError{&irc.Message{
717 Command: irc.ERR_SASLFAIL,
718 Params: []string{"*", "Invalid base64-encoded response"},
719 }}
720 }
721 }
722
723 challenge, done, err := dc.saslServer.Next(resp)
724 if err != nil {
725 dc.saslServer = nil
726 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
727 return ircError{&irc.Message{
728 Command: irc.ERR_SASLFAIL,
729 Params: []string{"*", ircErr.Message.Params[1]},
730 }}
731 }
732 dc.SendMessage(&irc.Message{
733 Prefix: dc.srv.prefix(),
734 Command: irc.ERR_SASLFAIL,
735 Params: []string{"*", "SASL error"},
736 })
737 return fmt.Errorf("SASL authentication failed: %v", err)
738 } else if done {
739 dc.saslServer = nil
740 dc.SendMessage(&irc.Message{
741 Prefix: dc.srv.prefix(),
742 Command: irc.RPL_LOGGEDIN,
743 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
744 })
745 dc.SendMessage(&irc.Message{
746 Prefix: dc.srv.prefix(),
747 Command: irc.RPL_SASLSUCCESS,
748 Params: []string{dc.nick, "SASL authentication successful"},
749 })
750 } else {
751 challengeStr := "+"
752 if len(challenge) > 0 {
753 challengeStr = base64.StdEncoding.EncodeToString(challenge)
754 }
755
756 // TODO: multi-line messages
757 dc.SendMessage(&irc.Message{
758 Prefix: dc.srv.prefix(),
759 Command: "AUTHENTICATE",
760 Params: []string{challengeStr},
761 })
762 }
763 case "BOUNCER":
764 var subcommand string
765 if err := parseMessageParams(msg, &subcommand); err != nil {
766 return err
767 }
768
769 switch strings.ToUpper(subcommand) {
770 case "BIND":
771 var idStr string
772 if err := parseMessageParams(msg, nil, &idStr); err != nil {
773 return err
774 }
775
776 if dc.user == nil {
777 return ircError{&irc.Message{
778 Command: "FAIL",
779 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
780 }}
781 }
782
783 id, err := parseBouncerNetID(subcommand, idStr)
784 if err != nil {
785 return err
786 }
787
788 var match *network
789 dc.user.forEachNetwork(func(net *network) {
790 if net.ID == id {
791 match = net
792 }
793 })
794 if match == nil {
795 return ircError{&irc.Message{
796 Command: "FAIL",
797 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
798 }}
799 }
800
801 dc.networkName = match.GetName()
802 }
803 default:
804 dc.logger.Printf("unhandled message: %v", msg)
805 return newUnknownCommandError(msg.Command)
806 }
807 if dc.rawUsername != "" && dc.nick != "" && !dc.negotiatingCaps {
808 return dc.register()
809 }
810 return nil
811}
812
813func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
814 cmd = strings.ToUpper(cmd)
815
816 replyTo := dc.nick
817 if !dc.registered {
818 replyTo = "*"
819 }
820
821 switch cmd {
822 case "LS":
823 if len(args) > 0 {
824 var err error
825 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
826 return err
827 }
828 }
829 if !dc.registered && dc.capVersion >= 302 {
830 // Let downstream show everything it supports, and trim
831 // down the available capabilities when upstreams are
832 // known.
833 for k, v := range needAllDownstreamCaps {
834 dc.supportedCaps[k] = v
835 }
836 }
837
838 caps := make([]string, 0, len(dc.supportedCaps))
839 for k, v := range dc.supportedCaps {
840 if dc.capVersion >= 302 && v != "" {
841 caps = append(caps, k+"="+v)
842 } else {
843 caps = append(caps, k)
844 }
845 }
846
847 // TODO: multi-line replies
848 dc.SendMessage(&irc.Message{
849 Prefix: dc.srv.prefix(),
850 Command: "CAP",
851 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
852 })
853
854 if dc.capVersion >= 302 {
855 // CAP version 302 implicitly enables cap-notify
856 dc.caps["cap-notify"] = true
857 }
858
859 if !dc.registered {
860 dc.negotiatingCaps = true
861 }
862 case "LIST":
863 var caps []string
864 for name, enabled := range dc.caps {
865 if enabled {
866 caps = append(caps, name)
867 }
868 }
869
870 // TODO: multi-line replies
871 dc.SendMessage(&irc.Message{
872 Prefix: dc.srv.prefix(),
873 Command: "CAP",
874 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
875 })
876 case "REQ":
877 if len(args) == 0 {
878 return ircError{&irc.Message{
879 Command: err_invalidcapcmd,
880 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
881 }}
882 }
883
884 // TODO: atomically ack/nak the whole capability set
885 caps := strings.Fields(args[0])
886 ack := true
887 for _, name := range caps {
888 name = strings.ToLower(name)
889 enable := !strings.HasPrefix(name, "-")
890 if !enable {
891 name = strings.TrimPrefix(name, "-")
892 }
893
894 if enable == dc.caps[name] {
895 continue
896 }
897
898 _, ok := dc.supportedCaps[name]
899 if !ok {
900 ack = false
901 break
902 }
903
904 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
905 // cap-notify cannot be disabled with CAP version 302
906 ack = false
907 break
908 }
909
910 dc.caps[name] = enable
911 }
912
913 reply := "NAK"
914 if ack {
915 reply = "ACK"
916 }
917 dc.SendMessage(&irc.Message{
918 Prefix: dc.srv.prefix(),
919 Command: "CAP",
920 Params: []string{replyTo, reply, args[0]},
921 })
922
923 if !dc.registered {
924 dc.negotiatingCaps = true
925 }
926 case "END":
927 dc.negotiatingCaps = false
928 default:
929 return ircError{&irc.Message{
930 Command: err_invalidcapcmd,
931 Params: []string{replyTo, cmd, "Unknown CAP command"},
932 }}
933 }
934 return nil
935}
936
937func (dc *downstreamConn) setSupportedCap(name, value string) {
938 prevValue, hasPrev := dc.supportedCaps[name]
939 changed := !hasPrev || prevValue != value
940 dc.supportedCaps[name] = value
941
942 if !dc.caps["cap-notify"] || !changed {
943 return
944 }
945
946 replyTo := dc.nick
947 if !dc.registered {
948 replyTo = "*"
949 }
950
951 cap := name
952 if value != "" && dc.capVersion >= 302 {
953 cap = name + "=" + value
954 }
955
956 dc.SendMessage(&irc.Message{
957 Prefix: dc.srv.prefix(),
958 Command: "CAP",
959 Params: []string{replyTo, "NEW", cap},
960 })
961}
962
963func (dc *downstreamConn) unsetSupportedCap(name string) {
964 _, hasPrev := dc.supportedCaps[name]
965 delete(dc.supportedCaps, name)
966 delete(dc.caps, name)
967
968 if !dc.caps["cap-notify"] || !hasPrev {
969 return
970 }
971
972 replyTo := dc.nick
973 if !dc.registered {
974 replyTo = "*"
975 }
976
977 dc.SendMessage(&irc.Message{
978 Prefix: dc.srv.prefix(),
979 Command: "CAP",
980 Params: []string{replyTo, "DEL", name},
981 })
982}
983
984func (dc *downstreamConn) updateSupportedCaps() {
985 supportedCaps := make(map[string]bool)
986 for cap := range needAllDownstreamCaps {
987 supportedCaps[cap] = true
988 }
989 dc.forEachUpstream(func(uc *upstreamConn) {
990 for cap, supported := range supportedCaps {
991 supportedCaps[cap] = supported && uc.caps[cap]
992 }
993 })
994
995 for cap, supported := range supportedCaps {
996 if supported {
997 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
998 } else {
999 dc.unsetSupportedCap(cap)
1000 }
1001 }
1002
1003 if _, ok := dc.user.msgStore.(chatHistoryMessageStore); ok && dc.network != nil {
1004 dc.setSupportedCap("draft/event-playback", "")
1005 } else {
1006 dc.unsetSupportedCap("draft/event-playback")
1007 }
1008}
1009
1010func (dc *downstreamConn) updateNick() {
1011 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
1012 dc.SendMessage(&irc.Message{
1013 Prefix: dc.prefix(),
1014 Command: "NICK",
1015 Params: []string{uc.nick},
1016 })
1017 dc.nick = uc.nick
1018 dc.nickCM = casemapASCII(dc.nick)
1019 }
1020}
1021
1022func (dc *downstreamConn) updateRealname() {
1023 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
1024 dc.SendMessage(&irc.Message{
1025 Prefix: dc.prefix(),
1026 Command: "SETNAME",
1027 Params: []string{uc.realname},
1028 })
1029 dc.realname = uc.realname
1030 }
1031}
1032
1033func sanityCheckServer(ctx context.Context, addr string) error {
1034 ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
1035 defer cancel()
1036
1037 conn, err := new(tls.Dialer).DialContext(ctx, "tcp", addr)
1038 if err != nil {
1039 return err
1040 }
1041
1042 return conn.Close()
1043}
1044
1045func unmarshalUsername(rawUsername string) (username, client, network string) {
1046 username = rawUsername
1047
1048 i := strings.IndexAny(username, "/@")
1049 j := strings.LastIndexAny(username, "/@")
1050 if i >= 0 {
1051 username = rawUsername[:i]
1052 }
1053 if j >= 0 {
1054 if rawUsername[j] == '@' {
1055 client = rawUsername[j+1:]
1056 } else {
1057 network = rawUsername[j+1:]
1058 }
1059 }
1060 if i >= 0 && j >= 0 && i < j {
1061 if rawUsername[i] == '@' {
1062 client = rawUsername[i+1 : j]
1063 } else {
1064 network = rawUsername[i+1 : j]
1065 }
1066 }
1067
1068 return username, client, network
1069}
1070
1071func (dc *downstreamConn) authenticate(username, password string) error {
1072 username, clientName, networkName := unmarshalUsername(username)
1073
1074 u, err := dc.srv.db.GetUser(context.TODO(), username)
1075 if err != nil {
1076 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
1077 return errAuthFailed
1078 }
1079
1080 // Password auth disabled
1081 if u.Password == "" {
1082 return errAuthFailed
1083 }
1084
1085 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
1086 if err != nil {
1087 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
1088 return errAuthFailed
1089 }
1090
1091 dc.user = dc.srv.getUser(username)
1092 if dc.user == nil {
1093 dc.logger.Printf("failed authentication for %q: user not active", username)
1094 return errAuthFailed
1095 }
1096 dc.clientName = clientName
1097 dc.networkName = networkName
1098 return nil
1099}
1100
1101func (dc *downstreamConn) register() error {
1102 if dc.registered {
1103 return fmt.Errorf("tried to register twice")
1104 }
1105
1106 password := dc.password
1107 dc.password = ""
1108 if dc.user == nil {
1109 if err := dc.authenticate(dc.rawUsername, password); err != nil {
1110 return err
1111 }
1112 }
1113
1114 if dc.clientName == "" && dc.networkName == "" {
1115 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1116 }
1117
1118 dc.registered = true
1119 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1120 return nil
1121}
1122
1123func (dc *downstreamConn) loadNetwork() error {
1124 if dc.networkName == "" {
1125 return nil
1126 }
1127
1128 network := dc.user.getNetwork(dc.networkName)
1129 if network == nil {
1130 addr := dc.networkName
1131 if !strings.ContainsRune(addr, ':') {
1132 addr = addr + ":6697"
1133 }
1134
1135 dc.logger.Printf("trying to connect to new network %q", addr)
1136 if err := sanityCheckServer(context.TODO(), addr); err != nil {
1137 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1138 return ircError{&irc.Message{
1139 Command: irc.ERR_PASSWDMISMATCH,
1140 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1141 }}
1142 }
1143
1144 // Some clients only allow specifying the nickname (and use the
1145 // nickname as a username too). Strip the network name from the
1146 // nickname when auto-saving networks.
1147 nick, _, _ := unmarshalUsername(dc.nick)
1148
1149 dc.logger.Printf("auto-saving network %q", dc.networkName)
1150 var err error
1151 network, err = dc.user.createNetwork(context.TODO(), &Network{
1152 Addr: dc.networkName,
1153 Nick: nick,
1154 Enabled: true,
1155 })
1156 if err != nil {
1157 return err
1158 }
1159 }
1160
1161 dc.network = network
1162 return nil
1163}
1164
1165func (dc *downstreamConn) welcome() error {
1166 if dc.user == nil || !dc.registered {
1167 panic("tried to welcome an unregistered connection")
1168 }
1169
1170 // TODO: doing this might take some time. We should do it in dc.register
1171 // instead, but we'll potentially be adding a new network and this must be
1172 // done in the user goroutine.
1173 if err := dc.loadNetwork(); err != nil {
1174 return err
1175 }
1176
1177 if dc.network == nil && !dc.caps["soju.im/bouncer-networks"] && dc.srv.Config().MultiUpstream {
1178 dc.isMultiUpstream = true
1179 }
1180
1181 isupport := []string{
1182 fmt.Sprintf("CHATHISTORY=%v", chatHistoryLimit),
1183 "CASEMAPPING=ascii",
1184 }
1185
1186 if dc.network != nil {
1187 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1188 }
1189 if title := dc.srv.Config().Title; dc.network == nil && title != "" {
1190 isupport = append(isupport, "NETWORK="+encodeISUPPORT(title))
1191 }
1192 if dc.network == nil && !dc.isMultiUpstream {
1193 isupport = append(isupport, "WHOX")
1194 }
1195
1196 if uc := dc.upstream(); uc != nil {
1197 for k := range passthroughIsupport {
1198 v, ok := uc.isupport[k]
1199 if !ok {
1200 continue
1201 }
1202 if v != nil {
1203 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1204 } else {
1205 isupport = append(isupport, k)
1206 }
1207 }
1208 }
1209
1210 dc.SendMessage(&irc.Message{
1211 Prefix: dc.srv.prefix(),
1212 Command: irc.RPL_WELCOME,
1213 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1214 })
1215 dc.SendMessage(&irc.Message{
1216 Prefix: dc.srv.prefix(),
1217 Command: irc.RPL_YOURHOST,
1218 Params: []string{dc.nick, "Your host is " + dc.srv.Config().Hostname},
1219 })
1220 dc.SendMessage(&irc.Message{
1221 Prefix: dc.srv.prefix(),
1222 Command: irc.RPL_MYINFO,
1223 Params: []string{dc.nick, dc.srv.Config().Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1224 })
1225 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1226 dc.SendMessage(msg)
1227 }
1228 if uc := dc.upstream(); uc != nil {
1229 dc.SendMessage(&irc.Message{
1230 Prefix: dc.srv.prefix(),
1231 Command: irc.RPL_UMODEIS,
1232 Params: []string{dc.nick, "+" + string(uc.modes)},
1233 })
1234 }
1235 if dc.network == nil && !dc.isMultiUpstream && dc.user.Admin {
1236 dc.SendMessage(&irc.Message{
1237 Prefix: dc.srv.prefix(),
1238 Command: irc.RPL_UMODEIS,
1239 Params: []string{dc.nick, "+o"},
1240 })
1241 }
1242
1243 if motd := dc.user.srv.Config().MOTD; motd != "" && dc.network == nil {
1244 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1245 dc.SendMessage(msg)
1246 }
1247 } else {
1248 motdHint := "No MOTD"
1249 if dc.network != nil {
1250 motdHint = "Use /motd to read the message of the day"
1251 }
1252 dc.SendMessage(&irc.Message{
1253 Prefix: dc.srv.prefix(),
1254 Command: irc.ERR_NOMOTD,
1255 Params: []string{dc.nick, motdHint},
1256 })
1257 }
1258
1259 dc.updateNick()
1260 dc.updateRealname()
1261 dc.updateSupportedCaps()
1262
1263 if dc.caps["soju.im/bouncer-networks-notify"] {
1264 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1265 dc.user.forEachNetwork(func(network *network) {
1266 idStr := fmt.Sprintf("%v", network.ID)
1267 attrs := getNetworkAttrs(network)
1268 dc.SendMessage(&irc.Message{
1269 Tags: irc.Tags{"batch": batchRef},
1270 Prefix: dc.srv.prefix(),
1271 Command: "BOUNCER",
1272 Params: []string{"NETWORK", idStr, attrs.String()},
1273 })
1274 })
1275 })
1276 }
1277
1278 dc.forEachUpstream(func(uc *upstreamConn) {
1279 for _, entry := range uc.channels.innerMap {
1280 ch := entry.value.(*upstreamChannel)
1281 if !ch.complete {
1282 continue
1283 }
1284 record := uc.network.channels.Value(ch.Name)
1285 if record != nil && record.Detached {
1286 continue
1287 }
1288
1289 dc.SendMessage(&irc.Message{
1290 Prefix: dc.prefix(),
1291 Command: "JOIN",
1292 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1293 })
1294
1295 forwardChannel(dc, ch)
1296 }
1297 })
1298
1299 dc.forEachNetwork(func(net *network) {
1300 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1301 return
1302 }
1303
1304 // Only send history if we're the first connected client with that name
1305 // for the network
1306 firstClient := true
1307 dc.user.forEachDownstream(func(c *downstreamConn) {
1308 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1309 firstClient = false
1310 }
1311 })
1312 if firstClient {
1313 net.delivered.ForEachTarget(func(target string) {
1314 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1315 if lastDelivered == "" {
1316 return
1317 }
1318
1319 dc.sendTargetBacklog(net, target, lastDelivered)
1320
1321 // Fast-forward history to last message
1322 targetCM := net.casemap(target)
1323 lastID, err := dc.user.msgStore.LastMsgID(&net.Network, targetCM, time.Now())
1324 if err != nil {
1325 dc.logger.Printf("failed to get last message ID: %v", err)
1326 return
1327 }
1328 net.delivered.StoreID(target, dc.clientName, lastID)
1329 })
1330 }
1331 })
1332
1333 return nil
1334}
1335
1336// messageSupportsBacklog checks whether the provided message can be sent as
1337// part of an history batch.
1338func (dc *downstreamConn) messageSupportsBacklog(msg *irc.Message) bool {
1339 // Don't replay all messages, because that would mess up client
1340 // state. For instance we just sent the list of users, sending
1341 // PART messages for one of these users would be incorrect.
1342 switch msg.Command {
1343 case "PRIVMSG", "NOTICE":
1344 return true
1345 }
1346 return false
1347}
1348
1349func (dc *downstreamConn) sendTargetBacklog(net *network, target, msgID string) {
1350 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1351 return
1352 }
1353
1354 ch := net.channels.Value(target)
1355
1356 ctx, cancel := context.WithTimeout(context.TODO(), backlogTimeout)
1357 defer cancel()
1358
1359 targetCM := net.casemap(target)
1360 history, err := dc.user.msgStore.LoadLatestID(ctx, &net.Network, targetCM, msgID, backlogLimit)
1361 if err != nil {
1362 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1363 return
1364 }
1365
1366 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1367 for _, msg := range history {
1368 if ch != nil && ch.Detached {
1369 if net.detachedMessageNeedsRelay(ch, msg) {
1370 dc.relayDetachedMessage(net, msg)
1371 }
1372 } else {
1373 msg.Tags["batch"] = batchRef
1374 dc.SendMessage(dc.marshalMessage(msg, net))
1375 }
1376 }
1377 })
1378}
1379
1380func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1381 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1382 return
1383 }
1384
1385 sender := msg.Prefix.Name
1386 target, text := msg.Params[0], msg.Params[1]
1387 if net.isHighlight(msg) {
1388 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1389 } else {
1390 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1391 }
1392}
1393
1394func (dc *downstreamConn) runUntilRegistered() error {
1395 for !dc.registered {
1396 msg, err := dc.ReadMessage()
1397 if err != nil {
1398 return fmt.Errorf("failed to read IRC command: %w", err)
1399 }
1400
1401 err = dc.handleMessage(msg)
1402 if ircErr, ok := err.(ircError); ok {
1403 ircErr.Message.Prefix = dc.srv.prefix()
1404 dc.SendMessage(ircErr.Message)
1405 } else if err != nil {
1406 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1407 }
1408 }
1409
1410 return nil
1411}
1412
1413func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1414 ctx, cancel := context.WithTimeout(context.TODO(), handleDownstreamMessageTimeout)
1415 defer cancel()
1416
1417 switch msg.Command {
1418 case "CAP":
1419 var subCmd string
1420 if err := parseMessageParams(msg, &subCmd); err != nil {
1421 return err
1422 }
1423 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1424 return err
1425 }
1426 case "PING":
1427 var source, destination string
1428 if err := parseMessageParams(msg, &source); err != nil {
1429 return err
1430 }
1431 if len(msg.Params) > 1 {
1432 destination = msg.Params[1]
1433 }
1434 hostname := dc.srv.Config().Hostname
1435 if destination != "" && destination != hostname {
1436 return ircError{&irc.Message{
1437 Command: irc.ERR_NOSUCHSERVER,
1438 Params: []string{dc.nick, destination, "No such server"},
1439 }}
1440 }
1441 dc.SendMessage(&irc.Message{
1442 Prefix: dc.srv.prefix(),
1443 Command: "PONG",
1444 Params: []string{hostname, source},
1445 })
1446 return nil
1447 case "PONG":
1448 if len(msg.Params) == 0 {
1449 return newNeedMoreParamsError(msg.Command)
1450 }
1451 token := msg.Params[len(msg.Params)-1]
1452 dc.handlePong(token)
1453 case "USER":
1454 return ircError{&irc.Message{
1455 Command: irc.ERR_ALREADYREGISTERED,
1456 Params: []string{dc.nick, "You may not reregister"},
1457 }}
1458 case "NICK":
1459 var rawNick string
1460 if err := parseMessageParams(msg, &rawNick); err != nil {
1461 return err
1462 }
1463
1464 nick := rawNick
1465 var upstream *upstreamConn
1466 if dc.upstream() == nil {
1467 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1468 if err == nil { // NICK nick/network: NICK only on a specific upstream
1469 upstream = uc
1470 nick = unmarshaledNick
1471 }
1472 }
1473
1474 if strings.ContainsAny(nick, illegalNickChars) {
1475 return ircError{&irc.Message{
1476 Command: irc.ERR_ERRONEUSNICKNAME,
1477 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1478 }}
1479 }
1480 if casemapASCII(nick) == serviceNickCM {
1481 return ircError{&irc.Message{
1482 Command: irc.ERR_NICKNAMEINUSE,
1483 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1484 }}
1485 }
1486
1487 var err error
1488 dc.forEachNetwork(func(n *network) {
1489 if err != nil || (upstream != nil && upstream.network != n) {
1490 return
1491 }
1492 n.Nick = nick
1493 err = dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network)
1494 })
1495 if err != nil {
1496 return err
1497 }
1498
1499 dc.forEachUpstream(func(uc *upstreamConn) {
1500 if upstream != nil && upstream != uc {
1501 return
1502 }
1503 uc.SendMessageLabeled(dc.id, &irc.Message{
1504 Command: "NICK",
1505 Params: []string{nick},
1506 })
1507 })
1508
1509 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1510 dc.SendMessage(&irc.Message{
1511 Prefix: dc.prefix(),
1512 Command: "NICK",
1513 Params: []string{nick},
1514 })
1515 dc.nick = nick
1516 dc.nickCM = casemapASCII(dc.nick)
1517 }
1518 case "SETNAME":
1519 var realname string
1520 if err := parseMessageParams(msg, &realname); err != nil {
1521 return err
1522 }
1523
1524 // If the client just resets to the default, just wipe the per-network
1525 // preference
1526 storeRealname := realname
1527 if realname == dc.user.Realname {
1528 storeRealname = ""
1529 }
1530
1531 var storeErr error
1532 var needUpdate []Network
1533 dc.forEachNetwork(func(n *network) {
1534 // We only need to call updateNetwork for upstreams that don't
1535 // support setname
1536 if uc := n.conn; uc != nil && uc.caps["setname"] {
1537 uc.SendMessageLabeled(dc.id, &irc.Message{
1538 Command: "SETNAME",
1539 Params: []string{realname},
1540 })
1541
1542 n.Realname = storeRealname
1543 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
1544 dc.logger.Printf("failed to store network realname: %v", err)
1545 storeErr = err
1546 }
1547 return
1548 }
1549
1550 record := n.Network // copy network record because we'll mutate it
1551 record.Realname = storeRealname
1552 needUpdate = append(needUpdate, record)
1553 })
1554
1555 // Walk the network list as a second step, because updateNetwork
1556 // mutates the original list
1557 for _, record := range needUpdate {
1558 if _, err := dc.user.updateNetwork(ctx, &record); err != nil {
1559 dc.logger.Printf("failed to update network realname: %v", err)
1560 storeErr = err
1561 }
1562 }
1563 if storeErr != nil {
1564 return ircError{&irc.Message{
1565 Command: "FAIL",
1566 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1567 }}
1568 }
1569
1570 if dc.upstream() == nil {
1571 dc.SendMessage(&irc.Message{
1572 Prefix: dc.prefix(),
1573 Command: "SETNAME",
1574 Params: []string{realname},
1575 })
1576 }
1577 case "JOIN":
1578 var namesStr string
1579 if err := parseMessageParams(msg, &namesStr); err != nil {
1580 return err
1581 }
1582
1583 var keys []string
1584 if len(msg.Params) > 1 {
1585 keys = strings.Split(msg.Params[1], ",")
1586 }
1587
1588 for i, name := range strings.Split(namesStr, ",") {
1589 uc, upstreamName, err := dc.unmarshalEntity(name)
1590 if err != nil {
1591 return err
1592 }
1593
1594 var key string
1595 if len(keys) > i {
1596 key = keys[i]
1597 }
1598
1599 if !uc.isChannel(upstreamName) {
1600 dc.SendMessage(&irc.Message{
1601 Prefix: dc.srv.prefix(),
1602 Command: irc.ERR_NOSUCHCHANNEL,
1603 Params: []string{name, "Not a channel name"},
1604 })
1605 continue
1606 }
1607
1608 params := []string{upstreamName}
1609 if key != "" {
1610 params = append(params, key)
1611 }
1612 uc.SendMessageLabeled(dc.id, &irc.Message{
1613 Command: "JOIN",
1614 Params: params,
1615 })
1616
1617 ch := uc.network.channels.Value(upstreamName)
1618 if ch != nil {
1619 // Don't clear the channel key if there's one set
1620 // TODO: add a way to unset the channel key
1621 if key != "" {
1622 ch.Key = key
1623 }
1624 uc.network.attach(ch)
1625 } else {
1626 ch = &Channel{
1627 Name: upstreamName,
1628 Key: key,
1629 }
1630 uc.network.channels.SetValue(upstreamName, ch)
1631 }
1632 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1633 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1634 }
1635 }
1636 case "PART":
1637 var namesStr string
1638 if err := parseMessageParams(msg, &namesStr); err != nil {
1639 return err
1640 }
1641
1642 var reason string
1643 if len(msg.Params) > 1 {
1644 reason = msg.Params[1]
1645 }
1646
1647 for _, name := range strings.Split(namesStr, ",") {
1648 uc, upstreamName, err := dc.unmarshalEntity(name)
1649 if err != nil {
1650 return err
1651 }
1652
1653 if strings.EqualFold(reason, "detach") {
1654 ch := uc.network.channels.Value(upstreamName)
1655 if ch != nil {
1656 uc.network.detach(ch)
1657 } else {
1658 ch = &Channel{
1659 Name: name,
1660 Detached: true,
1661 }
1662 uc.network.channels.SetValue(upstreamName, ch)
1663 }
1664 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1665 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1666 }
1667 } else {
1668 params := []string{upstreamName}
1669 if reason != "" {
1670 params = append(params, reason)
1671 }
1672 uc.SendMessageLabeled(dc.id, &irc.Message{
1673 Command: "PART",
1674 Params: params,
1675 })
1676
1677 if err := uc.network.deleteChannel(ctx, upstreamName); err != nil {
1678 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1679 }
1680 }
1681 }
1682 case "KICK":
1683 var channelStr, userStr string
1684 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1685 return err
1686 }
1687
1688 channels := strings.Split(channelStr, ",")
1689 users := strings.Split(userStr, ",")
1690
1691 var reason string
1692 if len(msg.Params) > 2 {
1693 reason = msg.Params[2]
1694 }
1695
1696 if len(channels) != 1 && len(channels) != len(users) {
1697 return ircError{&irc.Message{
1698 Command: irc.ERR_BADCHANMASK,
1699 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1700 }}
1701 }
1702
1703 for i, user := range users {
1704 var channel string
1705 if len(channels) == 1 {
1706 channel = channels[0]
1707 } else {
1708 channel = channels[i]
1709 }
1710
1711 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1712 if err != nil {
1713 return err
1714 }
1715
1716 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1717 if err != nil {
1718 return err
1719 }
1720
1721 if ucChannel != ucUser {
1722 return ircError{&irc.Message{
1723 Command: irc.ERR_USERNOTINCHANNEL,
1724 Params: []string{dc.nick, user, channel, "They are on another network"},
1725 }}
1726 }
1727 uc := ucChannel
1728
1729 params := []string{upstreamChannel, upstreamUser}
1730 if reason != "" {
1731 params = append(params, reason)
1732 }
1733 uc.SendMessageLabeled(dc.id, &irc.Message{
1734 Command: "KICK",
1735 Params: params,
1736 })
1737 }
1738 case "MODE":
1739 var name string
1740 if err := parseMessageParams(msg, &name); err != nil {
1741 return err
1742 }
1743
1744 var modeStr string
1745 if len(msg.Params) > 1 {
1746 modeStr = msg.Params[1]
1747 }
1748
1749 if casemapASCII(name) == dc.nickCM {
1750 if modeStr != "" {
1751 if uc := dc.upstream(); uc != nil {
1752 uc.SendMessageLabeled(dc.id, &irc.Message{
1753 Command: "MODE",
1754 Params: []string{uc.nick, modeStr},
1755 })
1756 } else {
1757 dc.SendMessage(&irc.Message{
1758 Prefix: dc.srv.prefix(),
1759 Command: irc.ERR_UMODEUNKNOWNFLAG,
1760 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1761 })
1762 }
1763 } else {
1764 var userMode string
1765 if uc := dc.upstream(); uc != nil {
1766 userMode = string(uc.modes)
1767 }
1768
1769 dc.SendMessage(&irc.Message{
1770 Prefix: dc.srv.prefix(),
1771 Command: irc.RPL_UMODEIS,
1772 Params: []string{dc.nick, "+" + userMode},
1773 })
1774 }
1775 return nil
1776 }
1777
1778 uc, upstreamName, err := dc.unmarshalEntity(name)
1779 if err != nil {
1780 return err
1781 }
1782
1783 if !uc.isChannel(upstreamName) {
1784 return ircError{&irc.Message{
1785 Command: irc.ERR_USERSDONTMATCH,
1786 Params: []string{dc.nick, "Cannot change mode for other users"},
1787 }}
1788 }
1789
1790 if modeStr != "" {
1791 params := []string{upstreamName, modeStr}
1792 params = append(params, msg.Params[2:]...)
1793 uc.SendMessageLabeled(dc.id, &irc.Message{
1794 Command: "MODE",
1795 Params: params,
1796 })
1797 } else {
1798 ch := uc.channels.Value(upstreamName)
1799 if ch == nil {
1800 return ircError{&irc.Message{
1801 Command: irc.ERR_NOSUCHCHANNEL,
1802 Params: []string{dc.nick, name, "No such channel"},
1803 }}
1804 }
1805
1806 if ch.modes == nil {
1807 // we haven't received the initial RPL_CHANNELMODEIS yet
1808 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1809 return nil
1810 }
1811
1812 modeStr, modeParams := ch.modes.Format()
1813 params := []string{dc.nick, name, modeStr}
1814 params = append(params, modeParams...)
1815
1816 dc.SendMessage(&irc.Message{
1817 Prefix: dc.srv.prefix(),
1818 Command: irc.RPL_CHANNELMODEIS,
1819 Params: params,
1820 })
1821 if ch.creationTime != "" {
1822 dc.SendMessage(&irc.Message{
1823 Prefix: dc.srv.prefix(),
1824 Command: rpl_creationtime,
1825 Params: []string{dc.nick, name, ch.creationTime},
1826 })
1827 }
1828 }
1829 case "TOPIC":
1830 var channel string
1831 if err := parseMessageParams(msg, &channel); err != nil {
1832 return err
1833 }
1834
1835 uc, upstreamName, err := dc.unmarshalEntity(channel)
1836 if err != nil {
1837 return err
1838 }
1839
1840 if len(msg.Params) > 1 { // setting topic
1841 topic := msg.Params[1]
1842 uc.SendMessageLabeled(dc.id, &irc.Message{
1843 Command: "TOPIC",
1844 Params: []string{upstreamName, topic},
1845 })
1846 } else { // getting topic
1847 ch := uc.channels.Value(upstreamName)
1848 if ch == nil {
1849 return ircError{&irc.Message{
1850 Command: irc.ERR_NOSUCHCHANNEL,
1851 Params: []string{dc.nick, upstreamName, "No such channel"},
1852 }}
1853 }
1854 sendTopic(dc, ch)
1855 }
1856 case "LIST":
1857 network := dc.network
1858 if network == nil && len(msg.Params) > 0 {
1859 var err error
1860 network, msg.Params[0], err = dc.unmarshalEntityNetwork(msg.Params[0])
1861 if err != nil {
1862 return err
1863 }
1864 }
1865 if network == nil {
1866 dc.SendMessage(&irc.Message{
1867 Prefix: dc.srv.prefix(),
1868 Command: irc.RPL_LISTEND,
1869 Params: []string{dc.nick, "LIST without a network suffix is not supported in multi-upstream mode"},
1870 })
1871 return nil
1872 }
1873
1874 uc := network.conn
1875 if uc == nil {
1876 dc.SendMessage(&irc.Message{
1877 Prefix: dc.srv.prefix(),
1878 Command: irc.RPL_LISTEND,
1879 Params: []string{dc.nick, "Disconnected from upstream server"},
1880 })
1881 return nil
1882 }
1883
1884 uc.enqueueCommand(dc, msg)
1885 case "NAMES":
1886 if len(msg.Params) == 0 {
1887 dc.SendMessage(&irc.Message{
1888 Prefix: dc.srv.prefix(),
1889 Command: irc.RPL_ENDOFNAMES,
1890 Params: []string{dc.nick, "*", "End of /NAMES list"},
1891 })
1892 return nil
1893 }
1894
1895 channels := strings.Split(msg.Params[0], ",")
1896 for _, channel := range channels {
1897 uc, upstreamName, err := dc.unmarshalEntity(channel)
1898 if err != nil {
1899 return err
1900 }
1901
1902 ch := uc.channels.Value(upstreamName)
1903 if ch != nil {
1904 sendNames(dc, ch)
1905 } else {
1906 // NAMES on a channel we have not joined, ask upstream
1907 uc.SendMessageLabeled(dc.id, &irc.Message{
1908 Command: "NAMES",
1909 Params: []string{upstreamName},
1910 })
1911 }
1912 }
1913 // For WHOX docs, see:
1914 // - http://faerion.sourceforge.net/doc/irc/whox.var
1915 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1916 // Note, many features aren't widely implemented, such as flags and mask2
1917 case "WHO":
1918 if len(msg.Params) == 0 {
1919 // TODO: support WHO without parameters
1920 dc.SendMessage(&irc.Message{
1921 Prefix: dc.srv.prefix(),
1922 Command: irc.RPL_ENDOFWHO,
1923 Params: []string{dc.nick, "*", "End of /WHO list"},
1924 })
1925 return nil
1926 }
1927
1928 // Clients will use the first mask to match RPL_ENDOFWHO
1929 endOfWhoToken := msg.Params[0]
1930
1931 // TODO: add support for WHOX mask2
1932 mask := msg.Params[0]
1933 var options string
1934 if len(msg.Params) > 1 {
1935 options = msg.Params[1]
1936 }
1937
1938 optionsParts := strings.SplitN(options, "%", 2)
1939 // TODO: add support for WHOX flags in optionsParts[0]
1940 var fields, whoxToken string
1941 if len(optionsParts) == 2 {
1942 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1943 fields = strings.ToLower(optionsParts[0])
1944 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1945 whoxToken = optionsParts[1]
1946 }
1947 }
1948
1949 // TODO: support mixed bouncer/upstream WHO queries
1950 maskCM := casemapASCII(mask)
1951 if dc.network == nil && maskCM == dc.nickCM {
1952 // TODO: support AWAY (H/G) in self WHO reply
1953 flags := "H"
1954 if dc.user.Admin {
1955 flags += "*"
1956 }
1957 info := whoxInfo{
1958 Token: whoxToken,
1959 Username: dc.user.Username,
1960 Hostname: dc.hostname,
1961 Server: dc.srv.Config().Hostname,
1962 Nickname: dc.nick,
1963 Flags: flags,
1964 Account: dc.user.Username,
1965 Realname: dc.realname,
1966 }
1967 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1968 dc.SendMessage(&irc.Message{
1969 Prefix: dc.srv.prefix(),
1970 Command: irc.RPL_ENDOFWHO,
1971 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1972 })
1973 return nil
1974 }
1975 if maskCM == serviceNickCM {
1976 info := whoxInfo{
1977 Token: whoxToken,
1978 Username: servicePrefix.User,
1979 Hostname: servicePrefix.Host,
1980 Server: dc.srv.Config().Hostname,
1981 Nickname: serviceNick,
1982 Flags: "H*",
1983 Account: serviceNick,
1984 Realname: serviceRealname,
1985 }
1986 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1987 dc.SendMessage(&irc.Message{
1988 Prefix: dc.srv.prefix(),
1989 Command: irc.RPL_ENDOFWHO,
1990 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1991 })
1992 return nil
1993 }
1994
1995 // TODO: properly support WHO masks
1996 uc, upstreamMask, err := dc.unmarshalEntity(mask)
1997 if err != nil {
1998 return err
1999 }
2000
2001 params := []string{upstreamMask}
2002 if options != "" {
2003 params = append(params, options)
2004 }
2005
2006 uc.enqueueCommand(dc, &irc.Message{
2007 Command: "WHO",
2008 Params: params,
2009 })
2010 case "WHOIS":
2011 if len(msg.Params) == 0 {
2012 return ircError{&irc.Message{
2013 Command: irc.ERR_NONICKNAMEGIVEN,
2014 Params: []string{dc.nick, "No nickname given"},
2015 }}
2016 }
2017
2018 var target, mask string
2019 if len(msg.Params) == 1 {
2020 target = ""
2021 mask = msg.Params[0]
2022 } else {
2023 target = msg.Params[0]
2024 mask = msg.Params[1]
2025 }
2026 // TODO: support multiple WHOIS users
2027 if i := strings.IndexByte(mask, ','); i >= 0 {
2028 mask = mask[:i]
2029 }
2030
2031 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2032 dc.SendMessage(&irc.Message{
2033 Prefix: dc.srv.prefix(),
2034 Command: irc.RPL_WHOISUSER,
2035 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2036 })
2037 dc.SendMessage(&irc.Message{
2038 Prefix: dc.srv.prefix(),
2039 Command: irc.RPL_WHOISSERVER,
2040 Params: []string{dc.nick, dc.nick, dc.srv.Config().Hostname, "soju"},
2041 })
2042 if dc.user.Admin {
2043 dc.SendMessage(&irc.Message{
2044 Prefix: dc.srv.prefix(),
2045 Command: irc.RPL_WHOISOPERATOR,
2046 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2047 })
2048 }
2049 dc.SendMessage(&irc.Message{
2050 Prefix: dc.srv.prefix(),
2051 Command: rpl_whoisaccount,
2052 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2053 })
2054 dc.SendMessage(&irc.Message{
2055 Prefix: dc.srv.prefix(),
2056 Command: irc.RPL_ENDOFWHOIS,
2057 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2058 })
2059 return nil
2060 }
2061 if casemapASCII(mask) == serviceNickCM {
2062 dc.SendMessage(&irc.Message{
2063 Prefix: dc.srv.prefix(),
2064 Command: irc.RPL_WHOISUSER,
2065 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2066 })
2067 dc.SendMessage(&irc.Message{
2068 Prefix: dc.srv.prefix(),
2069 Command: irc.RPL_WHOISSERVER,
2070 Params: []string{dc.nick, serviceNick, dc.srv.Config().Hostname, "soju"},
2071 })
2072 dc.SendMessage(&irc.Message{
2073 Prefix: dc.srv.prefix(),
2074 Command: irc.RPL_WHOISOPERATOR,
2075 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2076 })
2077 dc.SendMessage(&irc.Message{
2078 Prefix: dc.srv.prefix(),
2079 Command: rpl_whoisaccount,
2080 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2081 })
2082 dc.SendMessage(&irc.Message{
2083 Prefix: dc.srv.prefix(),
2084 Command: irc.RPL_ENDOFWHOIS,
2085 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2086 })
2087 return nil
2088 }
2089
2090 // TODO: support WHOIS masks
2091 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2092 if err != nil {
2093 return err
2094 }
2095
2096 var params []string
2097 if target != "" {
2098 if target == mask { // WHOIS nick nick
2099 params = []string{upstreamNick, upstreamNick}
2100 } else {
2101 params = []string{target, upstreamNick}
2102 }
2103 } else {
2104 params = []string{upstreamNick}
2105 }
2106
2107 uc.SendMessageLabeled(dc.id, &irc.Message{
2108 Command: "WHOIS",
2109 Params: params,
2110 })
2111 case "PRIVMSG", "NOTICE":
2112 var targetsStr, text string
2113 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2114 return err
2115 }
2116 tags := copyClientTags(msg.Tags)
2117
2118 for _, name := range strings.Split(targetsStr, ",") {
2119 if name == "$"+dc.srv.Config().Hostname || (name == "$*" && dc.network == nil) {
2120 // "$" means a server mask follows. If it's the bouncer's
2121 // hostname, broadcast the message to all bouncer users.
2122 if !dc.user.Admin {
2123 return ircError{&irc.Message{
2124 Prefix: dc.srv.prefix(),
2125 Command: irc.ERR_BADMASK,
2126 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2127 }}
2128 }
2129
2130 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2131
2132 broadcastTags := tags.Copy()
2133 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2134 broadcastMsg := &irc.Message{
2135 Tags: broadcastTags,
2136 Prefix: servicePrefix,
2137 Command: msg.Command,
2138 Params: []string{name, text},
2139 }
2140 dc.srv.forEachUser(func(u *user) {
2141 u.events <- eventBroadcast{broadcastMsg}
2142 })
2143 continue
2144 }
2145
2146 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2147 dc.SendMessage(&irc.Message{
2148 Tags: msg.Tags.Copy(),
2149 Prefix: dc.prefix(),
2150 Command: msg.Command,
2151 Params: []string{name, text},
2152 })
2153 continue
2154 }
2155
2156 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2157 if dc.caps["echo-message"] {
2158 echoTags := tags.Copy()
2159 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2160 dc.SendMessage(&irc.Message{
2161 Tags: echoTags,
2162 Prefix: dc.prefix(),
2163 Command: msg.Command,
2164 Params: []string{name, text},
2165 })
2166 }
2167 handleServicePRIVMSG(ctx, dc, text)
2168 continue
2169 }
2170
2171 uc, upstreamName, err := dc.unmarshalEntity(name)
2172 if err != nil {
2173 return err
2174 }
2175
2176 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2177 dc.handleNickServPRIVMSG(ctx, uc, text)
2178 }
2179
2180 unmarshaledText := text
2181 if uc.isChannel(upstreamName) {
2182 unmarshaledText = dc.unmarshalText(uc, text)
2183 }
2184 uc.SendMessageLabeled(dc.id, &irc.Message{
2185 Tags: tags,
2186 Command: msg.Command,
2187 Params: []string{upstreamName, unmarshaledText},
2188 })
2189
2190 echoTags := tags.Copy()
2191 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2192 if uc.account != "" {
2193 echoTags["account"] = irc.TagValue(uc.account)
2194 }
2195 echoMsg := &irc.Message{
2196 Tags: echoTags,
2197 Prefix: &irc.Prefix{Name: uc.nick},
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 "MONITOR":
2272 // MONITOR is unsupported in multi-upstream mode
2273 uc := dc.upstream()
2274 if uc == nil {
2275 return newUnknownCommandError(msg.Command)
2276 }
2277
2278 var subcommand string
2279 if err := parseMessageParams(msg, &subcommand); err != nil {
2280 return err
2281 }
2282
2283 switch strings.ToUpper(subcommand) {
2284 case "+", "-":
2285 var targets string
2286 if err := parseMessageParams(msg, nil, &targets); err != nil {
2287 return err
2288 }
2289 for _, target := range strings.Split(targets, ",") {
2290 if subcommand == "+" {
2291 // Hard limit, just to avoid having downstreams fill our map
2292 if len(dc.monitored.innerMap) >= 1000 {
2293 dc.SendMessage(&irc.Message{
2294 Prefix: dc.srv.prefix(),
2295 Command: irc.ERR_MONLISTFULL,
2296 Params: []string{dc.nick, "1000", target, "Bouncer monitor list is full"},
2297 })
2298 continue
2299 }
2300
2301 dc.monitored.SetValue(target, nil)
2302
2303 if uc.monitored.Has(target) {
2304 cmd := irc.RPL_MONOFFLINE
2305 if online := uc.monitored.Value(target); online {
2306 cmd = irc.RPL_MONONLINE
2307 }
2308
2309 dc.SendMessage(&irc.Message{
2310 Prefix: dc.srv.prefix(),
2311 Command: cmd,
2312 Params: []string{dc.nick, target},
2313 })
2314 }
2315 } else {
2316 dc.monitored.Delete(target)
2317 }
2318 }
2319 uc.updateMonitor()
2320 case "C": // clear
2321 dc.monitored = newCasemapMap(0)
2322 uc.updateMonitor()
2323 case "L": // list
2324 // TODO: be less lazy and pack the list
2325 for _, entry := range dc.monitored.innerMap {
2326 dc.SendMessage(&irc.Message{
2327 Prefix: dc.srv.prefix(),
2328 Command: irc.RPL_MONLIST,
2329 Params: []string{dc.nick, entry.originalKey},
2330 })
2331 }
2332 dc.SendMessage(&irc.Message{
2333 Prefix: dc.srv.prefix(),
2334 Command: irc.RPL_ENDOFMONLIST,
2335 Params: []string{dc.nick, "End of MONITOR list"},
2336 })
2337 case "S": // status
2338 // TODO: be less lazy and pack the lists
2339 for _, entry := range dc.monitored.innerMap {
2340 target := entry.originalKey
2341
2342 cmd := irc.RPL_MONOFFLINE
2343 if online := uc.monitored.Value(target); online {
2344 cmd = irc.RPL_MONONLINE
2345 }
2346
2347 dc.SendMessage(&irc.Message{
2348 Prefix: dc.srv.prefix(),
2349 Command: cmd,
2350 Params: []string{dc.nick, target},
2351 })
2352 }
2353 }
2354 case "CHATHISTORY":
2355 var subcommand string
2356 if err := parseMessageParams(msg, &subcommand); err != nil {
2357 return err
2358 }
2359 var target, limitStr string
2360 var boundsStr [2]string
2361 switch subcommand {
2362 case "AFTER", "BEFORE":
2363 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2364 return err
2365 }
2366 case "BETWEEN":
2367 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2368 return err
2369 }
2370 case "TARGETS":
2371 if dc.network == nil {
2372 // Either an unbound bouncer network, in which case we should return no targets,
2373 // or a multi-upstream downstream, but we don't support CHATHISTORY TARGETS for those yet.
2374 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {})
2375 return nil
2376 }
2377 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2378 return err
2379 }
2380 default:
2381 // TODO: support LATEST, AROUND
2382 return ircError{&irc.Message{
2383 Command: "FAIL",
2384 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2385 }}
2386 }
2387
2388 // We don't save history for our service
2389 if casemapASCII(target) == serviceNickCM {
2390 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2391 return nil
2392 }
2393
2394 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2395 if !ok {
2396 return ircError{&irc.Message{
2397 Command: irc.ERR_UNKNOWNCOMMAND,
2398 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2399 }}
2400 }
2401
2402 network, entity, err := dc.unmarshalEntityNetwork(target)
2403 if err != nil {
2404 return err
2405 }
2406 entity = network.casemap(entity)
2407
2408 // TODO: support msgid criteria
2409 var bounds [2]time.Time
2410 bounds[0] = parseChatHistoryBound(boundsStr[0])
2411 if bounds[0].IsZero() {
2412 return ircError{&irc.Message{
2413 Command: "FAIL",
2414 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2415 }}
2416 }
2417
2418 if boundsStr[1] != "" {
2419 bounds[1] = parseChatHistoryBound(boundsStr[1])
2420 if bounds[1].IsZero() {
2421 return ircError{&irc.Message{
2422 Command: "FAIL",
2423 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2424 }}
2425 }
2426 }
2427
2428 limit, err := strconv.Atoi(limitStr)
2429 if err != nil || limit < 0 || limit > chatHistoryLimit {
2430 return ircError{&irc.Message{
2431 Command: "FAIL",
2432 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2433 }}
2434 }
2435
2436 eventPlayback := dc.caps["draft/event-playback"]
2437
2438 var history []*irc.Message
2439 switch subcommand {
2440 case "BEFORE":
2441 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], time.Time{}, limit, eventPlayback)
2442 case "AFTER":
2443 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], time.Now(), limit, eventPlayback)
2444 case "BETWEEN":
2445 if bounds[0].Before(bounds[1]) {
2446 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2447 } else {
2448 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2449 }
2450 case "TARGETS":
2451 // TODO: support TARGETS in multi-upstream mode
2452 targets, err := store.ListTargets(ctx, &network.Network, bounds[0], bounds[1], limit, eventPlayback)
2453 if err != nil {
2454 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2455 return ircError{&irc.Message{
2456 Command: "FAIL",
2457 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2458 }}
2459 }
2460
2461 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2462 for _, target := range targets {
2463 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2464 continue
2465 }
2466
2467 dc.SendMessage(&irc.Message{
2468 Tags: irc.Tags{"batch": batchRef},
2469 Prefix: dc.srv.prefix(),
2470 Command: "CHATHISTORY",
2471 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2472 })
2473 }
2474 })
2475
2476 return nil
2477 }
2478 if err != nil {
2479 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2480 return newChatHistoryError(subcommand, target)
2481 }
2482
2483 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2484 for _, msg := range history {
2485 msg.Tags["batch"] = batchRef
2486 dc.SendMessage(dc.marshalMessage(msg, network))
2487 }
2488 })
2489 case "BOUNCER":
2490 var subcommand string
2491 if err := parseMessageParams(msg, &subcommand); err != nil {
2492 return err
2493 }
2494
2495 switch strings.ToUpper(subcommand) {
2496 case "BIND":
2497 return ircError{&irc.Message{
2498 Command: "FAIL",
2499 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2500 }}
2501 case "LISTNETWORKS":
2502 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2503 dc.user.forEachNetwork(func(network *network) {
2504 idStr := fmt.Sprintf("%v", network.ID)
2505 attrs := getNetworkAttrs(network)
2506 dc.SendMessage(&irc.Message{
2507 Tags: irc.Tags{"batch": batchRef},
2508 Prefix: dc.srv.prefix(),
2509 Command: "BOUNCER",
2510 Params: []string{"NETWORK", idStr, attrs.String()},
2511 })
2512 })
2513 })
2514 case "ADDNETWORK":
2515 var attrsStr string
2516 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2517 return err
2518 }
2519 attrs := irc.ParseTags(attrsStr)
2520
2521 record := &Network{Nick: dc.nick, Enabled: true}
2522 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2523 return err
2524 }
2525
2526 if record.Nick == dc.user.Username {
2527 record.Nick = ""
2528 }
2529 if record.Realname == dc.user.Realname {
2530 record.Realname = ""
2531 }
2532
2533 network, err := dc.user.createNetwork(ctx, record)
2534 if err != nil {
2535 return ircError{&irc.Message{
2536 Command: "FAIL",
2537 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2538 }}
2539 }
2540
2541 dc.SendMessage(&irc.Message{
2542 Prefix: dc.srv.prefix(),
2543 Command: "BOUNCER",
2544 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2545 })
2546 case "CHANGENETWORK":
2547 var idStr, attrsStr string
2548 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2549 return err
2550 }
2551 id, err := parseBouncerNetID(subcommand, idStr)
2552 if err != nil {
2553 return err
2554 }
2555 attrs := irc.ParseTags(attrsStr)
2556
2557 net := dc.user.getNetworkByID(id)
2558 if net == nil {
2559 return ircError{&irc.Message{
2560 Command: "FAIL",
2561 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2562 }}
2563 }
2564
2565 record := net.Network // copy network record because we'll mutate it
2566 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2567 return err
2568 }
2569
2570 if record.Nick == dc.user.Username {
2571 record.Nick = ""
2572 }
2573 if record.Realname == dc.user.Realname {
2574 record.Realname = ""
2575 }
2576
2577 _, err = dc.user.updateNetwork(ctx, &record)
2578 if err != nil {
2579 return ircError{&irc.Message{
2580 Command: "FAIL",
2581 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2582 }}
2583 }
2584
2585 dc.SendMessage(&irc.Message{
2586 Prefix: dc.srv.prefix(),
2587 Command: "BOUNCER",
2588 Params: []string{"CHANGENETWORK", idStr},
2589 })
2590 case "DELNETWORK":
2591 var idStr string
2592 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2593 return err
2594 }
2595 id, err := parseBouncerNetID(subcommand, idStr)
2596 if err != nil {
2597 return err
2598 }
2599
2600 net := dc.user.getNetworkByID(id)
2601 if net == nil {
2602 return ircError{&irc.Message{
2603 Command: "FAIL",
2604 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2605 }}
2606 }
2607
2608 if err := dc.user.deleteNetwork(ctx, net.ID); err != nil {
2609 return err
2610 }
2611
2612 dc.SendMessage(&irc.Message{
2613 Prefix: dc.srv.prefix(),
2614 Command: "BOUNCER",
2615 Params: []string{"DELNETWORK", idStr},
2616 })
2617 default:
2618 return ircError{&irc.Message{
2619 Command: "FAIL",
2620 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2621 }}
2622 }
2623 default:
2624 dc.logger.Printf("unhandled message: %v", msg)
2625
2626 // Only forward unknown commands in single-upstream mode
2627 uc := dc.upstream()
2628 if uc == nil {
2629 return newUnknownCommandError(msg.Command)
2630 }
2631
2632 uc.SendMessageLabeled(dc.id, msg)
2633 }
2634 return nil
2635}
2636
2637func (dc *downstreamConn) handleNickServPRIVMSG(ctx context.Context, uc *upstreamConn, text string) {
2638 username, password, ok := parseNickServCredentials(text, uc.nick)
2639 if !ok {
2640 return
2641 }
2642
2643 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2644 // automatically erase the key pair or any other credentials.
2645 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2646 return
2647 }
2648
2649 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2650 n := uc.network
2651 n.SASL.Mechanism = "PLAIN"
2652 n.SASL.Plain.Username = username
2653 n.SASL.Plain.Password = password
2654 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
2655 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2656 }
2657}
2658
2659func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2660 fields := strings.Fields(text)
2661 if len(fields) < 2 {
2662 return "", "", false
2663 }
2664 cmd := strings.ToUpper(fields[0])
2665 params := fields[1:]
2666 switch cmd {
2667 case "REGISTER":
2668 username = nick
2669 password = params[0]
2670 case "IDENTIFY":
2671 if len(params) == 1 {
2672 username = nick
2673 password = params[0]
2674 } else {
2675 username = params[0]
2676 password = params[1]
2677 }
2678 case "SET":
2679 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2680 username = nick
2681 password = params[1]
2682 }
2683 default:
2684 return "", "", false
2685 }
2686 return username, password, true
2687}
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