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source: code/trunk/upstream.go@ 532

Last change on this file since 532 was 526, checked in by hubert, 4 years ago

Don't forward label tags

We don't want to have the label tag when calling uc.produce, otherwise
downstream will end up with junk labels.

File size: 45.2 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
[307]	4	"crypto"
	5	"crypto/sha256"
[13]	6	"crypto/tls"
[307]	7	"crypto/x509"
[95]	8	"encoding/base64"
[155]	9	"errors"
[13]	10	"fmt"
	11	"io"
	12	"net"
[19]	13	"strconv"
[17]	14	"strings"
[19]	15	"time"
[13]	16
[95]	17	"github.com/emersion/go-sasl"
[13]	18	"gopkg.in/irc.v3"
	19	)
	20
[282]	21	// permanentUpstreamCaps is the static list of upstream capabilities always
	22	// requested when supported.
	23	var permanentUpstreamCaps = map[string]bool{
	24	"away-notify": true,
	25	"batch": true,
[419]	26	"extended-join": true,
[448]	27	"invite-notify": true,
[282]	28	"labeled-response": true,
	29	"message-tags": true,
[292]	30	"multi-prefix": true,
[282]	31	"server-time": true,
	32	}
	33
[399]	34	type registrationError string
	35
	36	func (err registrationError) Error() string {
	37	return fmt.Sprintf("registration error: %v", string(err))
	38	}
	39
[19]	40	type upstreamChannel struct {
[162]	41	Name string
	42	conn *upstreamConn
	43	Topic string
[405]	44	TopicWho *irc.Prefix
[162]	45	TopicTime time.Time
	46	Status channelStatus
	47	modes channelModes
	48	creationTime string
[478]	49	Members membershipsCasemapMap
[162]	50	complete bool
[435]	51	detachTimer *time.Timer
[19]	52	}
	53
[435]	54	func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
	55	if uc.detachTimer != nil {
	56	uc.detachTimer.Stop()
	57	uc.detachTimer = nil
	58	}
	59
	60	if dur == 0 {
	61	return
	62	}
	63
	64	uc.detachTimer = time.AfterFunc(dur, func() {
	65	uc.conn.network.user.events <- eventChannelDetach{
	66	uc: uc.conn,
	67	name: uc.Name,
	68	}
	69	})
	70	}
	71
[13]	72	type upstreamConn struct {
[210]	73	conn
[16]	74
[210]	75	network *network
	76	user *user
	77
[16]	78	serverName string
	79	availableUserModes string
[139]	80	availableChannelModes map[byte]channelModeType
	81	availableChannelTypes string
	82	availableMemberships []membership
[460]	83	isupport map[string]*string
[19]	84
[277]	85	registered bool
	86	nick string
[478]	87	nickCM string
[277]	88	username string
	89	realname string
	90	modes userModes
[478]	91	channels upstreamChannelCasemapMap
[277]	92	supportedCaps map[string]string
[278]	93	caps map[string]bool
[277]	94	batches map[string]batch
	95	away bool
[278]	96	nextLabelID uint64
[95]	97
	98	saslClient sasl.Client
	99	saslStarted bool
[177]	100
[478]	101	casemapIsSet bool
	102
[177]	103	// set of LIST commands in progress, per downstream
	104	pendingLISTDownstreamSet map[uint64]struct{}
[13]	105	}
	106
[77]	107	func connectToUpstream(network network) (upstreamConn, error) {
[502]	108	logger := &prefixLogger{network.user.logger, fmt.Sprintf("upstream %q: ", network.GetName())}
[33]	109
[352]	110	dialer := net.Dialer{Timeout: connectTimeout}
[269]	111
[457]	112	u, err := network.URL()
[352]	113	if err != nil {
[457]	114	return nil, err
[352]	115	}
[206]	116
[269]	117	var netConn net.Conn
[352]	118	switch u.Scheme {
[269]	119	case "ircs":
[352]	120	addr := u.Host
[381]	121	host, _, err := net.SplitHostPort(u.Host)
	122	if err != nil {
	123	host = u.Host
	124	addr = u.Host + ":6697"
[269]	125	}
	126
	127	logger.Printf("connecting to TLS server at address %q", addr)
[307]	128
[455]	129	tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
[307]	130	if network.SASL.Mechanism == "EXTERNAL" {
	131	if network.SASL.External.CertBlob == nil {
	132	return nil, fmt.Errorf("missing certificate for authentication")
	133	}
	134	if network.SASL.External.PrivKeyBlob == nil {
	135	return nil, fmt.Errorf("missing private key for authentication")
	136	}
	137	key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
	138	if err != nil {
	139	return nil, fmt.Errorf("failed to parse private key: %v", err)
	140	}
[381]	141	tlsConfig.Certificates = []tls.Certificate{
	142	{
	143	Certificate: [][]byte{network.SASL.External.CertBlob},
	144	PrivateKey: key.(crypto.PrivateKey),
[307]	145	},
	146	}
	147	logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
	148	}
	149
[381]	150	netConn, err = dialer.Dial("tcp", addr)
[352]	151	if err != nil {
	152	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	153	}
[381]	154
	155	// Don't do the TLS handshake immediately, because we need to register
	156	// the new connection with identd ASAP. See:
	157	// https://todo.sr.ht/~emersion/soju/69#event-41859
	158	netConn = tls.Client(netConn, tlsConfig)
[270]	159	case "irc+insecure":
[352]	160	addr := u.Host
[351]	161	if _, _, err := net.SplitHostPort(addr); err != nil {
[270]	162	addr = addr + ":6667"
	163	}
	164
	165	logger.Printf("connecting to plain-text server at address %q", addr)
	166	netConn, err = dialer.Dial("tcp", addr)
[352]	167	if err != nil {
	168	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	169	}
[369]	170	case "irc+unix", "unix":
[353]	171	logger.Printf("connecting to Unix socket at path %q", u.Path)
	172	netConn, err = dialer.Dial("unix", u.Path)
	173	if err != nil {
	174	return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
	175	}
[269]	176	default:
[352]	177	return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
[269]	178	}
[33]	179
[398]	180	options := connOptions{
[402]	181	Logger: logger,
[398]	182	RateLimitDelay: upstreamMessageDelay,
	183	RateLimitBurst: upstreamMessageBurst,
	184	}
	185
[55]	186	uc := &upstreamConn{
[398]	187	conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
[177]	188	network: network,
	189	user: network.user,
[478]	190	channels: upstreamChannelCasemapMap{newCasemapMap(0)},
[277]	191	supportedCaps: make(map[string]string),
[278]	192	caps: make(map[string]bool),
[177]	193	batches: make(map[string]batch),
	194	availableChannelTypes: stdChannelTypes,
	195	availableChannelModes: stdChannelModes,
	196	availableMemberships: stdMemberships,
[460]	197	isupport: make(map[string]*string),
[177]	198	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[33]	199	}
[55]	200	return uc, nil
[33]	201	}
	202
[73]	203	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
[218]	204	uc.network.forEachDownstream(f)
[73]	205	}
	206
[161]	207	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	208	uc.forEachDownstream(func(dc *downstreamConn) {
	209	if id != 0 && id != dc.id {
	210	return
	211	}
	212	f(dc)
	213	})
	214	}
	215
[55]	216	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
[478]	217	ch := uc.channels.Value(name)
	218	if ch == nil {
[19]	219	return nil, fmt.Errorf("unknown channel %q", name)
	220	}
	221	return ch, nil
	222	}
	223
[129]	224	func (uc *upstreamConn) isChannel(entity string) bool {
[454]	225	return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
[129]	226	}
	227
[478]	228	func (uc *upstreamConn) isOurNick(nick string) bool {
	229	return uc.nickCM == uc.network.casemap(nick)
	230	}
	231
[181]	232	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	233	for _, pl := range uc.user.pendingLISTs {
	234	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	235	continue
	236	}
	237	return &pl
	238	}
	239	return nil
	240	}
	241
[181]	242	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	243	found = false
	244	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	245	pl := uc.user.pendingLISTs[i]
	246	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	247	continue
	248	}
	249	delete(pl.pendingCommands, uc.network.ID)
	250	if len(pl.pendingCommands) == 0 {
	251	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	252	i--
	253	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	254	dc.SendMessage(&irc.Message{
	255	Prefix: dc.srv.prefix(),
	256	Command: irc.RPL_LISTEND,
	257	Params: []string{dc.nick, "End of /LIST"},
	258	})
	259	})
	260	}
	261	found = true
	262	if !all {
	263	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	264	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	265	uc.trySendLIST(pl.downstreamID)
[177]	266	})
	267	return
	268	}
	269	}
	270	return
	271	}
	272
[181]	273	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	274	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	275	// a LIST command is already pending
	276	// we will try again when that command is completed
	277	return
	278	}
	279
	280	for _, pl := range uc.user.pendingLISTs {
	281	if pl.downstreamID != downstreamID {
	282	continue
	283	}
	284	// this is the first pending LIST command list of the downstream
	285	listCommand, ok := pl.pendingCommands[uc.network.ID]
	286	if !ok {
	287	// there is no command for this upstream in these LIST commands
	288	// do not send anything
	289	continue
	290	}
	291	// there is a command for this upstream in these LIST commands
	292	// send it now
	293
	294	uc.SendMessageLabeled(downstreamID, listCommand)
	295
	296	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	297	return
	298	}
	299	}
	300
[292]	301	func (uc upstreamConn) parseMembershipPrefix(s string) (ms memberships, nick string) {
	302	memberships := make(memberships, 0, 4)
	303	i := 0
[139]	304	for _, m := range uc.availableMemberships {
[292]	305	if i >= len(s) {
	306	break
[139]	307	}
[292]	308	if s[i] == m.Prefix {
	309	memberships = append(memberships, m)
	310	i++
	311	}
[139]	312	}
[292]	313	return &memberships, s[i:]
[139]	314	}
	315
[55]	316	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	317	var label string
	318	if l, ok := msg.GetTag("label"); ok {
	319	label = l
[526]	320	delete(msg.Tags, "label")
[155]	321	}
	322
[153]	323	var msgBatch *batch
	324	if batchName, ok := msg.GetTag("batch"); ok {
	325	b, ok := uc.batches[batchName]
	326	if !ok {
	327	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	328	}
	329	msgBatch = &b
[155]	330	if label == "" {
	331	label = msgBatch.Label
	332	}
[443]	333	delete(msg.Tags, "batch")
[153]	334	}
	335
[161]	336	var downstreamID uint64 = 0
[155]	337	if label != "" {
	338	var labelOffset uint64
[161]	339	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	340	if err == nil && n < 2 {
	341	err = errors.New("not enough arguments")
	342	}
	343	if err != nil {
	344	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	345	}
	346	}
	347
[216]	348	if _, ok := msg.Tags["time"]; !ok {
[240]	349	msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[216]	350	}
	351
[13]	352	switch msg.Command {
	353	case "PING":
[60]	354	uc.SendMessage(&irc.Message{
[13]	355	Command: "PONG",
[68]	356	Params: msg.Params,
[60]	357	})
[33]	358	return nil
[303]	359	case "NOTICE", "PRIVMSG", "TAGMSG":
[273]	360	if msg.Prefix == nil {
	361	return fmt.Errorf("expected a prefix")
	362	}
	363
[286]	364	var entity, text string
[303]	365	if msg.Command != "TAGMSG" {
	366	if err := parseMessageParams(msg, &entity, &text); err != nil {
	367	return err
	368	}
	369	} else {
	370	if err := parseMessageParams(msg, &entity); err != nil {
	371	return err
	372	}
[286]	373	}
	374
	375	if msg.Prefix.Name == serviceNick {
	376	uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
	377	break
	378	}
	379	if entity == serviceNick {
	380	uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
	381	break
	382	}
	383
[171]	384	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
[239]	385	uc.produce("", msg, nil)
[303]	386	} else { // regular user message
[217]	387	target := entity
[478]	388	if uc.isOurNick(target) {
[178]	389	target = msg.Prefix.Name
	390	}
[287]	391
[478]	392	ch := uc.network.channels.Value(target)
[505]	393	if ch != nil && msg.Command != "TAGMSG" {
[435]	394	if ch.Detached {
[499]	395	uc.handleDetachedMessage(ch, msg)
[435]	396	}
	397
[499]	398	highlight := uc.network.isHighlight(msg)
[435]	399	if ch.DetachOn == FilterMessage \|\| ch.DetachOn == FilterDefault \|\| (ch.DetachOn == FilterHighlight && highlight) {
	400	uc.updateChannelAutoDetach(target)
	401	}
[287]	402	}
[435]	403
	404	uc.produce(target, msg, nil)
[171]	405	}
[92]	406	case "CAP":
[95]	407	var subCmd string
	408	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	409	return err
[92]	410	}
[95]	411	subCmd = strings.ToUpper(subCmd)
	412	subParams := msg.Params[2:]
	413	switch subCmd {
	414	case "LS":
	415	if len(subParams) < 1 {
	416	return newNeedMoreParamsError(msg.Command)
	417	}
[281]	418	caps := subParams[len(subParams)-1]
[95]	419	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	420
[281]	421	uc.handleSupportedCaps(caps)
[92]	422
[95]	423	if more {
	424	break // wait to receive all capabilities
	425	}
	426
[281]	427	uc.requestCaps()
[152]	428
[95]	429	if uc.requestSASL() {
	430	break // we'll send CAP END after authentication is completed
	431	}
	432
[92]	433	uc.SendMessage(&irc.Message{
	434	Command: "CAP",
	435	Params: []string{"END"},
	436	})
[95]	437	case "ACK", "NAK":
	438	if len(subParams) < 1 {
	439	return newNeedMoreParamsError(msg.Command)
	440	}
	441	caps := strings.Fields(subParams[0])
	442
	443	for _, name := range caps {
	444	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	445	return err
	446	}
	447	}
	448
[281]	449	if uc.registered {
	450	uc.forEachDownstream(func(dc *downstreamConn) {
	451	dc.updateSupportedCaps()
	452	})
	453	}
	454	case "NEW":
	455	if len(subParams) < 1 {
	456	return newNeedMoreParamsError(msg.Command)
	457	}
	458	uc.handleSupportedCaps(subParams[0])
	459	uc.requestCaps()
	460	case "DEL":
	461	if len(subParams) < 1 {
	462	return newNeedMoreParamsError(msg.Command)
	463	}
	464	caps := strings.Fields(subParams[0])
	465
	466	for _, c := range caps {
	467	delete(uc.supportedCaps, c)
	468	delete(uc.caps, c)
	469	}
	470
	471	if uc.registered {
	472	uc.forEachDownstream(func(dc *downstreamConn) {
	473	dc.updateSupportedCaps()
	474	})
	475	}
[95]	476	default:
	477	uc.logger.Printf("unhandled message: %v", msg)
[92]	478	}
[95]	479	case "AUTHENTICATE":
	480	if uc.saslClient == nil {
	481	return fmt.Errorf("received unexpected AUTHENTICATE message")
	482	}
	483
	484	// TODO: if a challenge is 400 bytes long, buffer it
	485	var challengeStr string
	486	if err := parseMessageParams(msg, &challengeStr); err != nil {
	487	uc.SendMessage(&irc.Message{
	488	Command: "AUTHENTICATE",
	489	Params: []string{"*"},
	490	})
	491	return err
	492	}
	493
	494	var challenge []byte
	495	if challengeStr != "+" {
	496	var err error
	497	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	498	if err != nil {
	499	uc.SendMessage(&irc.Message{
	500	Command: "AUTHENTICATE",
	501	Params: []string{"*"},
	502	})
	503	return err
	504	}
	505	}
	506
	507	var resp []byte
	508	var err error
	509	if !uc.saslStarted {
	510	_, resp, err = uc.saslClient.Start()
	511	uc.saslStarted = true
	512	} else {
	513	resp, err = uc.saslClient.Next(challenge)
	514	}
	515	if err != nil {
	516	uc.SendMessage(&irc.Message{
	517	Command: "AUTHENTICATE",
	518	Params: []string{"*"},
	519	})
	520	return err
	521	}
	522
	523	// TODO: send response in multiple chunks if >= 400 bytes
	524	var respStr = "+"
[318]	525	if len(resp) != 0 {
[95]	526	respStr = base64.StdEncoding.EncodeToString(resp)
	527	}
	528
	529	uc.SendMessage(&irc.Message{
	530	Command: "AUTHENTICATE",
	531	Params: []string{respStr},
	532	})
[125]	533	case irc.RPL_LOGGEDIN:
[95]	534	var account string
	535	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	536	return err
	537	}
	538	uc.logger.Printf("logged in with account %q", account)
[125]	539	case irc.RPL_LOGGEDOUT:
[95]	540	uc.logger.Printf("logged out")
[125]	541	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	542	var info string
	543	if err := parseMessageParams(msg, nil, &info); err != nil {
	544	return err
	545	}
	546	switch msg.Command {
[125]	547	case irc.ERR_NICKLOCKED:
[95]	548	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	549	case irc.ERR_SASLFAIL:
[95]	550	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	551	case irc.ERR_SASLTOOLONG:
[95]	552	uc.logger.Printf("SASL message too long: %v", info)
	553	}
	554
	555	uc.saslClient = nil
	556	uc.saslStarted = false
	557
	558	uc.SendMessage(&irc.Message{
	559	Command: "CAP",
	560	Params: []string{"END"},
	561	})
[14]	562	case irc.RPL_WELCOME:
[55]	563	uc.registered = true
	564	uc.logger.Printf("connection registered")
[19]	565
[478]	566	if uc.network.channels.Len() > 0 {
[350]	567	var channels, keys []string
[478]	568	for _, entry := range uc.network.channels.innerMap {
	569	ch := entry.value.(*Channel)
[350]	570	channels = append(channels, ch.Name)
[310]	571	keys = append(keys, ch.Key)
	572	}
[350]	573
	574	for _, msg := range join(channels, keys) {
	575	uc.SendMessage(msg)
	576	}
[19]	577	}
[16]	578	case irc.RPL_MYINFO:
[139]	579	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	580	return err
[16]	581	}
[139]	582	case irc.RPL_ISUPPORT:
	583	if err := parseMessageParams(msg, nil, nil); err != nil {
	584	return err
[16]	585	}
[463]	586
	587	var downstreamIsupport []string
[139]	588	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	589	parameter := token
[460]	590	var negate, hasValue bool
	591	var value string
[139]	592	if strings.HasPrefix(token, "-") {
	593	negate = true
	594	token = token[1:]
[459]	595	} else if i := strings.IndexByte(token, '='); i >= 0 {
	596	parameter = token[:i]
	597	value = token[i+1:]
[460]	598	hasValue = true
[139]	599	}
[460]	600
	601	if hasValue {
	602	uc.isupport[parameter] = &value
	603	} else if !negate {
	604	uc.isupport[parameter] = nil
	605	} else {
	606	delete(uc.isupport, parameter)
	607	}
	608
[462]	609	var err error
	610	switch parameter {
[478]	611	case "CASEMAPPING":
	612	casemap, ok := parseCasemappingToken(value)
	613	if !ok {
	614	casemap = casemapRFC1459
	615	}
	616	uc.network.updateCasemapping(casemap)
	617	uc.nickCM = uc.network.casemap(uc.nick)
	618	uc.casemapIsSet = true
[462]	619	case "CHANMODES":
	620	if !negate {
	621	err = uc.handleChanModes(value)
	622	} else {
	623	uc.availableChannelModes = stdChannelModes
	624	}
	625	case "CHANTYPES":
	626	if !negate {
[139]	627	uc.availableChannelTypes = value
[462]	628	} else {
	629	uc.availableChannelTypes = stdChannelTypes
[139]	630	}
[462]	631	case "PREFIX":
	632	if !negate {
	633	err = uc.handleMemberships(value)
	634	} else {
	635	uc.availableMemberships = stdMemberships
	636	}
[139]	637	}
[462]	638	if err != nil {
	639	return err
	640	}
[463]	641
	642	if passthroughIsupport[parameter] {
	643	downstreamIsupport = append(downstreamIsupport, token)
	644	}
[139]	645	}
[463]	646
	647	uc.forEachDownstream(func(dc *downstreamConn) {
	648	if dc.network == nil {
	649	return
	650	}
	651	msgs := generateIsupport(dc.srv.prefix(), dc.nick, downstreamIsupport)
	652	for _, msg := range msgs {
	653	dc.SendMessage(msg)
	654	}
	655	})
[478]	656	case irc.ERR_NOMOTD, irc.RPL_ENDOFMOTD:
	657	if !uc.casemapIsSet {
	658	// upstream did not send any CASEMAPPING token, thus
	659	// we assume it implements the old RFCs with rfc1459.
	660	uc.casemapIsSet = true
	661	uc.network.updateCasemapping(casemapRFC1459)
	662	uc.nickCM = uc.network.casemap(uc.nick)
	663	}
[153]	664	case "BATCH":
	665	var tag string
	666	if err := parseMessageParams(msg, &tag); err != nil {
	667	return err
	668	}
	669
	670	if strings.HasPrefix(tag, "+") {
	671	tag = tag[1:]
	672	if _, ok := uc.batches[tag]; ok {
	673	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	674	}
	675	var batchType string
	676	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	677	return err
	678	}
[155]	679	label := label
	680	if label == "" && msgBatch != nil {
	681	label = msgBatch.Label
	682	}
[153]	683	uc.batches[tag] = batch{
	684	Type: batchType,
	685	Params: msg.Params[2:],
	686	Outer: msgBatch,
[155]	687	Label: label,
[153]	688	}
	689	} else if strings.HasPrefix(tag, "-") {
	690	tag = tag[1:]
	691	if _, ok := uc.batches[tag]; !ok {
	692	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	693	}
	694	delete(uc.batches, tag)
	695	} else {
	696	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	697	}
[42]	698	case "NICK":
[83]	699	if msg.Prefix == nil {
	700	return fmt.Errorf("expected a prefix")
	701	}
	702
[43]	703	var newNick string
	704	if err := parseMessageParams(msg, &newNick); err != nil {
	705	return err
[42]	706	}
	707
[244]	708	me := false
[478]	709	if uc.isOurNick(msg.Prefix.Name) {
[55]	710	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
[244]	711	me = true
[55]	712	uc.nick = newNick
[478]	713	uc.nickCM = uc.network.casemap(uc.nick)
[42]	714	}
	715
[478]	716	for _, entry := range uc.channels.innerMap {
	717	ch := entry.value.(*upstreamChannel)
	718	memberships := ch.Members.Value(msg.Prefix.Name)
	719	if memberships != nil {
	720	ch.Members.Delete(msg.Prefix.Name)
	721	ch.Members.SetValue(newNick, memberships)
[215]	722	uc.appendLog(ch.Name, msg)
[42]	723	}
	724	}
[82]	725
[244]	726	if !me {
[82]	727	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	728	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[82]	729	})
[296]	730	} else {
	731	uc.forEachDownstream(func(dc *downstreamConn) {
	732	dc.updateNick()
	733	})
[82]	734	}
[69]	735	case "JOIN":
	736	if msg.Prefix == nil {
	737	return fmt.Errorf("expected a prefix")
	738	}
[42]	739
[43]	740	var channels string
	741	if err := parseMessageParams(msg, &channels); err != nil {
	742	return err
[19]	743	}
[34]	744
[43]	745	for _, ch := range strings.Split(channels, ",") {
[478]	746	if uc.isOurNick(msg.Prefix.Name) {
[55]	747	uc.logger.Printf("joined channel %q", ch)
[478]	748	members := membershipsCasemapMap{newCasemapMap(0)}
	749	members.casemap = uc.network.casemap
	750	uc.channels.SetValue(ch, &upstreamChannel{
[34]	751	Name: ch,
[55]	752	conn: uc,
[478]	753	Members: members,
	754	})
[435]	755	uc.updateChannelAutoDetach(ch)
[139]	756
	757	uc.SendMessage(&irc.Message{
	758	Command: "MODE",
	759	Params: []string{ch},
	760	})
[34]	761	} else {
[55]	762	ch, err := uc.getChannel(ch)
[34]	763	if err != nil {
	764	return err
	765	}
[478]	766	ch.Members.SetValue(msg.Prefix.Name, &memberships{})
[19]	767	}
[69]	768
[245]	769	chMsg := msg.Copy()
	770	chMsg.Params[0] = ch
	771	uc.produce(ch, chMsg, nil)
[19]	772	}
[69]	773	case "PART":
	774	if msg.Prefix == nil {
	775	return fmt.Errorf("expected a prefix")
	776	}
[34]	777
[43]	778	var channels string
	779	if err := parseMessageParams(msg, &channels); err != nil {
	780	return err
[34]	781	}
	782
[43]	783	for _, ch := range strings.Split(channels, ",") {
[478]	784	if uc.isOurNick(msg.Prefix.Name) {
[55]	785	uc.logger.Printf("parted channel %q", ch)
[478]	786	uch := uc.channels.Value(ch)
	787	if uch != nil {
	788	uc.channels.Delete(ch)
[435]	789	uch.updateAutoDetach(0)
	790	}
[34]	791	} else {
[55]	792	ch, err := uc.getChannel(ch)
[34]	793	if err != nil {
	794	return err
	795	}
[478]	796	ch.Members.Delete(msg.Prefix.Name)
[34]	797	}
[69]	798
[245]	799	chMsg := msg.Copy()
	800	chMsg.Params[0] = ch
	801	uc.produce(ch, chMsg, nil)
[34]	802	}
[159]	803	case "KICK":
	804	if msg.Prefix == nil {
	805	return fmt.Errorf("expected a prefix")
	806	}
	807
	808	var channel, user string
	809	if err := parseMessageParams(msg, &channel, &user); err != nil {
	810	return err
	811	}
	812
[478]	813	if uc.isOurNick(user) {
[159]	814	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
[478]	815	uc.channels.Delete(channel)
[159]	816	} else {
	817	ch, err := uc.getChannel(channel)
	818	if err != nil {
	819	return err
	820	}
[478]	821	ch.Members.Delete(user)
[159]	822	}
	823
[245]	824	uc.produce(channel, msg, nil)
[83]	825	case "QUIT":
	826	if msg.Prefix == nil {
	827	return fmt.Errorf("expected a prefix")
	828	}
	829
[478]	830	if uc.isOurNick(msg.Prefix.Name) {
[83]	831	uc.logger.Printf("quit")
	832	}
	833
[478]	834	for _, entry := range uc.channels.innerMap {
	835	ch := entry.value.(*upstreamChannel)
	836	if ch.Members.Has(msg.Prefix.Name) {
	837	ch.Members.Delete(msg.Prefix.Name)
[178]	838
[215]	839	uc.appendLog(ch.Name, msg)
[178]	840	}
[83]	841	}
	842
	843	if msg.Prefix.Name != uc.nick {
	844	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	845	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[83]	846	})
	847	}
[19]	848	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	849	var name, topic string
	850	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	851	return err
[19]	852	}
[55]	853	ch, err := uc.getChannel(name)
[19]	854	if err != nil {
	855	return err
	856	}
	857	if msg.Command == irc.RPL_TOPIC {
[43]	858	ch.Topic = topic
[19]	859	} else {
	860	ch.Topic = ""
	861	}
	862	case "TOPIC":
[405]	863	if msg.Prefix == nil {
	864	return fmt.Errorf("expected a prefix")
	865	}
	866
[43]	867	var name string
[74]	868	if err := parseMessageParams(msg, &name); err != nil {
[43]	869	return err
[19]	870	}
[55]	871	ch, err := uc.getChannel(name)
[19]	872	if err != nil {
	873	return err
	874	}
	875	if len(msg.Params) > 1 {
	876	ch.Topic = msg.Params[1]
[405]	877	ch.TopicWho = msg.Prefix.Copy()
	878	ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
[19]	879	} else {
	880	ch.Topic = ""
	881	}
[245]	882	uc.produce(ch.Name, msg, nil)
[139]	883	case "MODE":
	884	var name, modeStr string
	885	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	886	return err
	887	}
	888
	889	if !uc.isChannel(name) { // user mode change
	890	if name != uc.nick {
	891	return fmt.Errorf("received MODE message for unknown nick %q", name)
	892	}
	893	return uc.modes.Apply(modeStr)
	894	// TODO: notify downstreams about user mode change?
	895	} else { // channel mode change
	896	ch, err := uc.getChannel(name)
	897	if err != nil {
	898	return err
	899	}
	900
[293]	901	needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
	902	if err != nil {
	903	return err
[139]	904	}
	905
[293]	906	uc.appendLog(ch.Name, msg)
	907
[478]	908	c := uc.network.channels.Value(name)
	909	if c == nil \|\| !c.Detached {
[338]	910	uc.forEachDownstream(func(dc *downstreamConn) {
	911	params := make([]string, len(msg.Params))
	912	params[0] = dc.marshalEntity(uc.network, name)
	913	params[1] = modeStr
	914
	915	copy(params[2:], msg.Params[2:])
	916	for i, modeParam := range params[2:] {
	917	if _, ok := needMarshaling[i]; ok {
	918	params[2+i] = dc.marshalEntity(uc.network, modeParam)
	919	}
[293]	920	}
	921
[338]	922	dc.SendMessage(&irc.Message{
	923	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	924	Command: "MODE",
	925	Params: params,
	926	})
[293]	927	})
[338]	928	}
[139]	929	}
	930	case irc.RPL_UMODEIS:
	931	if err := parseMessageParams(msg, nil); err != nil {
	932	return err
	933	}
	934	modeStr := ""
	935	if len(msg.Params) > 1 {
	936	modeStr = msg.Params[1]
	937	}
	938
	939	uc.modes = ""
	940	if err := uc.modes.Apply(modeStr); err != nil {
	941	return err
	942	}
	943	// TODO: send RPL_UMODEIS to downstream connections when applicable
	944	case irc.RPL_CHANNELMODEIS:
	945	var channel string
	946	if err := parseMessageParams(msg, nil, &channel); err != nil {
	947	return err
	948	}
	949	modeStr := ""
	950	if len(msg.Params) > 2 {
	951	modeStr = msg.Params[2]
	952	}
	953
	954	ch, err := uc.getChannel(channel)
	955	if err != nil {
	956	return err
	957	}
	958
	959	firstMode := ch.modes == nil
	960	ch.modes = make(map[byte]string)
[293]	961	if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
[139]	962	return err
	963	}
	964	if firstMode {
[478]	965	c := uc.network.channels.Value(channel)
	966	if c == nil \|\| !c.Detached {
[338]	967	modeStr, modeParams := ch.modes.Format()
[139]	968
[338]	969	uc.forEachDownstream(func(dc *downstreamConn) {
	970	params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
	971	params = append(params, modeParams...)
[139]	972
[338]	973	dc.SendMessage(&irc.Message{
	974	Prefix: dc.srv.prefix(),
	975	Command: irc.RPL_CHANNELMODEIS,
	976	Params: params,
	977	})
[139]	978	})
[338]	979	}
[139]	980	}
[162]	981	case rpl_creationtime:
	982	var channel, creationTime string
	983	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	984	return err
	985	}
	986
	987	ch, err := uc.getChannel(channel)
	988	if err != nil {
	989	return err
	990	}
	991
	992	firstCreationTime := ch.creationTime == ""
	993	ch.creationTime = creationTime
	994	if firstCreationTime {
	995	uc.forEachDownstream(func(dc *downstreamConn) {
	996	dc.SendMessage(&irc.Message{
	997	Prefix: dc.srv.prefix(),
	998	Command: rpl_creationtime,
[403]	999	Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
[162]	1000	})
	1001	})
	1002	}
[19]	1003	case rpl_topicwhotime:
[43]	1004	var name, who, timeStr string
	1005	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	1006	return err
[19]	1007	}
[55]	1008	ch, err := uc.getChannel(name)
[19]	1009	if err != nil {
	1010	return err
	1011	}
[405]	1012	firstTopicWhoTime := ch.TopicWho == nil
	1013	ch.TopicWho = irc.ParsePrefix(who)
[43]	1014	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	1015	if err != nil {
	1016	return fmt.Errorf("failed to parse topic time: %v", err)
	1017	}
	1018	ch.TopicTime = time.Unix(sec, 0)
[405]	1019	if firstTopicWhoTime {
	1020	uc.forEachDownstream(func(dc *downstreamConn) {
	1021	topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
	1022	dc.SendMessage(&irc.Message{
	1023	Prefix: dc.srv.prefix(),
	1024	Command: rpl_topicwhotime,
	1025	Params: []string{
	1026	dc.nick,
	1027	dc.marshalEntity(uc.network, ch.Name),
	1028	topicWho.String(),
	1029	timeStr,
	1030	},
	1031	})
	1032	})
	1033	}
[177]	1034	case irc.RPL_LIST:
	1035	var channel, clients, topic string
	1036	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	1037	return err
	1038	}
	1039
[181]	1040	pl := uc.getPendingLIST()
[177]	1041	if pl == nil {
	1042	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	1043	}
	1044
	1045	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	1046	dc.SendMessage(&irc.Message{
	1047	Prefix: dc.srv.prefix(),
	1048	Command: irc.RPL_LIST,
[260]	1049	Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
[177]	1050	})
	1051	})
	1052	case irc.RPL_LISTEND:
[181]	1053	ok := uc.endPendingLISTs(false)
[177]	1054	if !ok {
	1055	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	1056	}
[19]	1057	case irc.RPL_NAMREPLY:
[43]	1058	var name, statusStr, members string
	1059	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	1060	return err
[19]	1061	}
[140]	1062
[478]	1063	ch := uc.channels.Value(name)
	1064	if ch == nil {
[140]	1065	// NAMES on a channel we have not joined, forward to downstream
[161]	1066	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1067	channel := dc.marshalEntity(uc.network, name)
[174]	1068	members := splitSpace(members)
[140]	1069	for i, member := range members {
[292]	1070	memberships, nick := uc.parseMembershipPrefix(member)
	1071	members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
[140]	1072	}
	1073	memberStr := strings.Join(members, " ")
	1074
	1075	dc.SendMessage(&irc.Message{
	1076	Prefix: dc.srv.prefix(),
	1077	Command: irc.RPL_NAMREPLY,
	1078	Params: []string{dc.nick, statusStr, channel, memberStr},
	1079	})
	1080	})
	1081	return nil
[19]	1082	}
	1083
[43]	1084	status, err := parseChannelStatus(statusStr)
[19]	1085	if err != nil {
	1086	return err
	1087	}
	1088	ch.Status = status
	1089
[174]	1090	for _, s := range splitSpace(members) {
[292]	1091	memberships, nick := uc.parseMembershipPrefix(s)
[478]	1092	ch.Members.SetValue(nick, memberships)
[19]	1093	}
	1094	case irc.RPL_ENDOFNAMES:
[43]	1095	var name string
	1096	if err := parseMessageParams(msg, nil, &name); err != nil {
	1097	return err
[25]	1098	}
[140]	1099
[478]	1100	ch := uc.channels.Value(name)
	1101	if ch == nil {
[140]	1102	// NAMES on a channel we have not joined, forward to downstream
[161]	1103	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1104	channel := dc.marshalEntity(uc.network, name)
[140]	1105
	1106	dc.SendMessage(&irc.Message{
	1107	Prefix: dc.srv.prefix(),
	1108	Command: irc.RPL_ENDOFNAMES,
	1109	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1110	})
	1111	})
	1112	return nil
[25]	1113	}
	1114
[34]	1115	if ch.complete {
	1116	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1117	}
[25]	1118	ch.complete = true
[27]	1119
[478]	1120	c := uc.network.channels.Value(name)
	1121	if c == nil \|\| !c.Detached {
[338]	1122	uc.forEachDownstream(func(dc *downstreamConn) {
	1123	forwardChannel(dc, ch)
	1124	})
	1125	}
[127]	1126	case irc.RPL_WHOREPLY:
	1127	var channel, username, host, server, nick, mode, trailing string
	1128	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1129	return err
	1130	}
	1131
	1132	parts := strings.SplitN(trailing, " ", 2)
	1133	if len(parts) != 2 {
	1134	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1135	}
	1136	realname := parts[1]
	1137	hops, err := strconv.Atoi(parts[0])
	1138	if err != nil {
	1139	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1140	}
	1141	hops++
	1142
	1143	trailing = strconv.Itoa(hops) + " " + realname
	1144
[161]	1145	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1146	channel := channel
	1147	if channel != "*" {
[260]	1148	channel = dc.marshalEntity(uc.network, channel)
[127]	1149	}
[260]	1150	nick := dc.marshalEntity(uc.network, nick)
[127]	1151	dc.SendMessage(&irc.Message{
	1152	Prefix: dc.srv.prefix(),
	1153	Command: irc.RPL_WHOREPLY,
	1154	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1155	})
	1156	})
	1157	case irc.RPL_ENDOFWHO:
	1158	var name string
	1159	if err := parseMessageParams(msg, nil, &name); err != nil {
	1160	return err
	1161	}
	1162
[161]	1163	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1164	name := name
	1165	if name != "*" {
	1166	// TODO: support WHO masks
[260]	1167	name = dc.marshalEntity(uc.network, name)
[127]	1168	}
	1169	dc.SendMessage(&irc.Message{
	1170	Prefix: dc.srv.prefix(),
	1171	Command: irc.RPL_ENDOFWHO,
[142]	1172	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1173	})
	1174	})
[128]	1175	case irc.RPL_WHOISUSER:
	1176	var nick, username, host, realname string
	1177	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1178	return err
	1179	}
	1180
[161]	1181	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1182	nick := dc.marshalEntity(uc.network, nick)
[128]	1183	dc.SendMessage(&irc.Message{
	1184	Prefix: dc.srv.prefix(),
	1185	Command: irc.RPL_WHOISUSER,
	1186	Params: []string{dc.nick, nick, username, host, "*", realname},
	1187	})
	1188	})
	1189	case irc.RPL_WHOISSERVER:
	1190	var nick, server, serverInfo string
	1191	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1192	return err
	1193	}
	1194
[161]	1195	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1196	nick := dc.marshalEntity(uc.network, nick)
[128]	1197	dc.SendMessage(&irc.Message{
	1198	Prefix: dc.srv.prefix(),
	1199	Command: irc.RPL_WHOISSERVER,
	1200	Params: []string{dc.nick, nick, server, serverInfo},
	1201	})
	1202	})
	1203	case irc.RPL_WHOISOPERATOR:
	1204	var nick string
	1205	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1206	return err
	1207	}
	1208
[161]	1209	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1210	nick := dc.marshalEntity(uc.network, nick)
[128]	1211	dc.SendMessage(&irc.Message{
	1212	Prefix: dc.srv.prefix(),
	1213	Command: irc.RPL_WHOISOPERATOR,
	1214	Params: []string{dc.nick, nick, "is an IRC operator"},
	1215	})
	1216	})
	1217	case irc.RPL_WHOISIDLE:
	1218	var nick string
	1219	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1220	return err
	1221	}
	1222
[161]	1223	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1224	nick := dc.marshalEntity(uc.network, nick)
[128]	1225	params := []string{dc.nick, nick}
	1226	params = append(params, msg.Params[2:]...)
	1227	dc.SendMessage(&irc.Message{
	1228	Prefix: dc.srv.prefix(),
	1229	Command: irc.RPL_WHOISIDLE,
	1230	Params: params,
	1231	})
	1232	})
	1233	case irc.RPL_WHOISCHANNELS:
	1234	var nick, channelList string
	1235	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1236	return err
	1237	}
[174]	1238	channels := splitSpace(channelList)
[128]	1239
[161]	1240	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1241	nick := dc.marshalEntity(uc.network, nick)
[128]	1242	channelList := make([]string, len(channels))
	1243	for i, channel := range channels {
[139]	1244	prefix, channel := uc.parseMembershipPrefix(channel)
[260]	1245	channel = dc.marshalEntity(uc.network, channel)
[292]	1246	channelList[i] = prefix.Format(dc) + channel
[128]	1247	}
	1248	channels := strings.Join(channelList, " ")
	1249	dc.SendMessage(&irc.Message{
	1250	Prefix: dc.srv.prefix(),
	1251	Command: irc.RPL_WHOISCHANNELS,
	1252	Params: []string{dc.nick, nick, channels},
	1253	})
	1254	})
	1255	case irc.RPL_ENDOFWHOIS:
	1256	var nick string
	1257	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1258	return err
	1259	}
	1260
[161]	1261	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1262	nick := dc.marshalEntity(uc.network, nick)
[128]	1263	dc.SendMessage(&irc.Message{
	1264	Prefix: dc.srv.prefix(),
	1265	Command: irc.RPL_ENDOFWHOIS,
[142]	1266	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1267	})
	1268	})
[115]	1269	case "INVITE":
[273]	1270	var nick, channel string
[115]	1271	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1272	return err
	1273	}
	1274
[478]	1275	weAreInvited := uc.isOurNick(nick)
[448]	1276
[115]	1277	uc.forEachDownstream(func(dc *downstreamConn) {
[448]	1278	if !weAreInvited && !dc.caps["invite-notify"] {
	1279	return
	1280	}
[115]	1281	dc.SendMessage(&irc.Message{
[260]	1282	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
[115]	1283	Command: "INVITE",
[260]	1284	Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[115]	1285	})
	1286	})
[163]	1287	case irc.RPL_INVITING:
[273]	1288	var nick, channel string
[304]	1289	if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
[163]	1290	return err
	1291	}
	1292
	1293	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1294	dc.SendMessage(&irc.Message{
	1295	Prefix: dc.srv.prefix(),
	1296	Command: irc.RPL_INVITING,
[260]	1297	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[163]	1298	})
	1299	})
[272]	1300	case irc.RPL_AWAY:
	1301	var nick, reason string
	1302	if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
	1303	return err
	1304	}
	1305
[274]	1306	uc.forEachDownstream(func(dc *downstreamConn) {
[272]	1307	dc.SendMessage(&irc.Message{
	1308	Prefix: dc.srv.prefix(),
	1309	Command: irc.RPL_AWAY,
	1310	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
	1311	})
	1312	})
[276]	1313	case "AWAY":
	1314	if msg.Prefix == nil {
	1315	return fmt.Errorf("expected a prefix")
	1316	}
	1317
	1318	uc.forEachDownstream(func(dc *downstreamConn) {
	1319	if !dc.caps["away-notify"] {
	1320	return
	1321	}
	1322	dc.SendMessage(&irc.Message{
	1323	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	1324	Command: "AWAY",
	1325	Params: msg.Params,
	1326	})
	1327	})
[300]	1328	case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
	1329	var channel, mask string
	1330	if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
	1331	return err
	1332	}
	1333	var addNick, addTime string
	1334	if len(msg.Params) >= 5 {
	1335	addNick = msg.Params[3]
	1336	addTime = msg.Params[4]
	1337	}
	1338
	1339	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1340	channel := dc.marshalEntity(uc.network, channel)
	1341
	1342	var params []string
	1343	if addNick != "" && addTime != "" {
	1344	addNick := dc.marshalEntity(uc.network, addNick)
	1345	params = []string{dc.nick, channel, mask, addNick, addTime}
	1346	} else {
	1347	params = []string{dc.nick, channel, mask}
	1348	}
	1349
	1350	dc.SendMessage(&irc.Message{
	1351	Prefix: dc.srv.prefix(),
	1352	Command: msg.Command,
	1353	Params: params,
	1354	})
	1355	})
	1356	case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
	1357	var channel, trailing string
	1358	if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
	1359	return err
	1360	}
	1361
	1362	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1363	upstreamChannel := dc.marshalEntity(uc.network, channel)
	1364	dc.SendMessage(&irc.Message{
	1365	Prefix: dc.srv.prefix(),
	1366	Command: msg.Command,
	1367	Params: []string{dc.nick, upstreamChannel, trailing},
	1368	})
	1369	})
[302]	1370	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1371	var command, reason string
	1372	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1373	return err
	1374	}
	1375
	1376	if command == "LIST" {
	1377	ok := uc.endPendingLISTs(false)
	1378	if !ok {
	1379	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1380	}
	1381	}
	1382
[355]	1383	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1384	dc.SendMessage(&irc.Message{
	1385	Prefix: uc.srv.prefix(),
	1386	Command: msg.Command,
	1387	Params: []string{dc.nick, command, reason},
[302]	1388	})
[355]	1389	})
[155]	1390	case "ACK":
	1391	// Ignore
[198]	1392	case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
	1393	// Ignore
[16]	1394	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1395	// Ignore
	1396	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1397	// Ignore
[478]	1398	case irc.RPL_MOTDSTART, irc.RPL_MOTD:
[14]	1399	// Ignore
[177]	1400	case irc.RPL_LISTSTART:
	1401	// Ignore
[14]	1402	case rpl_localusers, rpl_globalusers:
	1403	// Ignore
[96]	1404	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1405	// Ignore
[390]	1406	case "ERROR":
	1407	var text string
	1408	if err := parseMessageParams(msg, &text); err != nil {
	1409	return err
	1410	}
	1411	return fmt.Errorf("fatal server error: %v", text)
[389]	1412	case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
[342]	1413	if !uc.registered {
[399]	1414	text := msg.Params[len(msg.Params)-1]
	1415	return registrationError(text)
[342]	1416	}
	1417	fallthrough
[13]	1418	default:
[95]	1419	uc.logger.Printf("unhandled message: %v", msg)
[355]	1420
	1421	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1422	// best effort marshaling for unknown messages, replies and errors:
	1423	// most numerics start with the user nick, marshal it if that's the case
	1424	// otherwise, conservately keep the params without marshaling
	1425	params := msg.Params
	1426	if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
	1427	if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
	1428	params[0] = dc.nick
[302]	1429	}
[355]	1430	}
	1431	dc.SendMessage(&irc.Message{
	1432	Prefix: uc.srv.prefix(),
	1433	Command: msg.Command,
	1434	Params: params,
[302]	1435	})
[355]	1436	})
[13]	1437	}
[14]	1438	return nil
[13]	1439	}
	1440
[499]	1441	func (uc upstreamConn) handleDetachedMessage(ch Channel, msg *irc.Message) {
	1442	if uc.network.detachedMessageNeedsRelay(ch, msg) {
[435]	1443	uc.forEachDownstream(func(dc *downstreamConn) {
[499]	1444	dc.relayDetachedMessage(uc.network, msg)
[435]	1445	})
	1446	}
[499]	1447	if ch.ReattachOn == FilterMessage \|\| (ch.ReattachOn == FilterHighlight && uc.network.isHighlight(msg)) {
[435]	1448	uc.network.attach(ch)
	1449	if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
	1450	uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
	1451	}
	1452	}
	1453	}
	1454
[458]	1455	func (uc *upstreamConn) handleChanModes(s string) error {
	1456	parts := strings.SplitN(s, ",", 5)
	1457	if len(parts) < 4 {
	1458	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
	1459	}
	1460	modes := make(map[byte]channelModeType)
	1461	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	1462	for j := 0; j < len(parts[i]); j++ {
	1463	mode := parts[i][j]
	1464	modes[mode] = mt
	1465	}
	1466	}
	1467	uc.availableChannelModes = modes
	1468	return nil
	1469	}
	1470
	1471	func (uc *upstreamConn) handleMemberships(s string) error {
	1472	if s == "" {
	1473	uc.availableMemberships = nil
	1474	return nil
	1475	}
	1476
	1477	if s[0] != '(' {
	1478	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1479	}
	1480	sep := strings.IndexByte(s, ')')
	1481	if sep < 0 \|\| len(s) != sep*2 {
	1482	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1483	}
	1484	memberships := make([]membership, len(s)/2-1)
	1485	for i := range memberships {
	1486	memberships[i] = membership{
	1487	Mode: s[i+1],
	1488	Prefix: s[sep+i+1],
	1489	}
	1490	}
	1491	uc.availableMemberships = memberships
	1492	return nil
	1493	}
	1494
[281]	1495	func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
	1496	caps := strings.Fields(capsStr)
	1497	for _, s := range caps {
	1498	kv := strings.SplitN(s, "=", 2)
	1499	k := strings.ToLower(kv[0])
	1500	var v string
	1501	if len(kv) == 2 {
	1502	v = kv[1]
	1503	}
	1504	uc.supportedCaps[k] = v
	1505	}
	1506	}
	1507
	1508	func (uc *upstreamConn) requestCaps() {
	1509	var requestCaps []string
[282]	1510	for c := range permanentUpstreamCaps {
[281]	1511	if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
	1512	requestCaps = append(requestCaps, c)
	1513	}
	1514	}
	1515
	1516	if uc.requestSASL() && !uc.caps["sasl"] {
	1517	requestCaps = append(requestCaps, "sasl")
	1518	}
	1519
[282]	1520	if len(requestCaps) == 0 {
	1521	return
	1522	}
	1523
	1524	uc.SendMessage(&irc.Message{
	1525	Command: "CAP",
	1526	Params: []string{"REQ", strings.Join(requestCaps, " ")},
	1527	})
	1528	}
	1529
	1530	func (uc *upstreamConn) requestSASL() bool {
	1531	if uc.network.SASL.Mechanism == "" {
	1532	return false
	1533	}
	1534
	1535	v, ok := uc.supportedCaps["sasl"]
	1536	if !ok {
	1537	return false
	1538	}
	1539	if v != "" {
	1540	mechanisms := strings.Split(v, ",")
	1541	found := false
	1542	for _, mech := range mechanisms {
	1543	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1544	found = true
	1545	break
	1546	}
	1547	}
	1548	if !found {
	1549	return false
	1550	}
	1551	}
	1552
	1553	return true
	1554	}
	1555
	1556	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1557	uc.caps[name] = ok
	1558
	1559	switch name {
	1560	case "sasl":
	1561	if !ok {
	1562	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1563	return nil
	1564	}
	1565
	1566	auth := &uc.network.SASL
	1567	switch auth.Mechanism {
	1568	case "PLAIN":
	1569	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1570	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
[307]	1571	case "EXTERNAL":
	1572	uc.logger.Printf("starting SASL EXTERNAL authentication")
	1573	uc.saslClient = sasl.NewExternalClient("")
[282]	1574	default:
	1575	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1576	}
	1577
[281]	1578	uc.SendMessage(&irc.Message{
[282]	1579	Command: "AUTHENTICATE",
	1580	Params: []string{auth.Mechanism},
[281]	1581	})
[282]	1582	default:
	1583	if permanentUpstreamCaps[name] {
	1584	break
	1585	}
	1586	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[281]	1587	}
[282]	1588	return nil
[281]	1589	}
	1590
[174]	1591	func splitSpace(s string) []string {
	1592	return strings.FieldsFunc(s, func(r rune) bool {
	1593	return r == ' '
	1594	})
	1595	}
	1596
[55]	1597	func (uc *upstreamConn) register() {
[77]	1598	uc.nick = uc.network.Nick
[478]	1599	uc.nickCM = uc.network.casemap(uc.nick)
[457]	1600	uc.username = uc.network.GetUsername()
	1601	uc.realname = uc.network.GetRealname()
[77]	1602
[60]	1603	uc.SendMessage(&irc.Message{
[92]	1604	Command: "CAP",
	1605	Params: []string{"LS", "302"},
	1606	})
	1607
[93]	1608	if uc.network.Pass != "" {
	1609	uc.SendMessage(&irc.Message{
	1610	Command: "PASS",
	1611	Params: []string{uc.network.Pass},
	1612	})
	1613	}
	1614
[92]	1615	uc.SendMessage(&irc.Message{
[13]	1616	Command: "NICK",
[69]	1617	Params: []string{uc.nick},
[60]	1618	})
	1619	uc.SendMessage(&irc.Message{
[13]	1620	Command: "USER",
[77]	1621	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1622	})
[44]	1623	}
[13]	1624
[197]	1625	func (uc *upstreamConn) runUntilRegistered() error {
	1626	for !uc.registered {
[212]	1627	msg, err := uc.ReadMessage()
[197]	1628	if err != nil {
	1629	return fmt.Errorf("failed to read message: %v", err)
	1630	}
	1631
	1632	if err := uc.handleMessage(msg); err != nil {
[399]	1633	if _, ok := err.(registrationError); ok {
	1634	return err
	1635	} else {
	1636	msg.Tags = nil // prevent message tags from cluttering logs
	1637	return fmt.Errorf("failed to handle message %q: %v", msg, err)
	1638	}
[197]	1639	}
	1640	}
	1641
[263]	1642	for _, command := range uc.network.ConnectCommands {
	1643	m, err := irc.ParseMessage(command)
	1644	if err != nil {
	1645	uc.logger.Printf("failed to parse connect command %q: %v", command, err)
	1646	} else {
	1647	uc.SendMessage(m)
	1648	}
	1649	}
	1650
[197]	1651	return nil
	1652	}
	1653
[165]	1654	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1655	for {
[210]	1656	msg, err := uc.ReadMessage()
[13]	1657	if err == io.EOF {
	1658	break
	1659	} else if err != nil {
	1660	return fmt.Errorf("failed to read IRC command: %v", err)
	1661	}
	1662
[165]	1663	ch <- eventUpstreamMessage{msg, uc}
[13]	1664	}
	1665
[45]	1666	return nil
[13]	1667	}
[60]	1668
[303]	1669	func (uc upstreamConn) SendMessage(msg irc.Message) {
	1670	if !uc.caps["message-tags"] {
	1671	msg = msg.Copy()
	1672	msg.Tags = nil
	1673	}
	1674
	1675	uc.conn.SendMessage(msg)
	1676	}
	1677
[176]	1678	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[278]	1679	if uc.caps["labeled-response"] {
[155]	1680	if msg.Tags == nil {
	1681	msg.Tags = make(map[string]irc.TagValue)
	1682	}
[176]	1683	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1684	uc.nextLabelID++
[155]	1685	}
	1686	uc.SendMessage(msg)
	1687	}
[178]	1688
[428]	1689	// appendLog appends a message to the log file.
	1690	//
	1691	// The internal message ID is returned. If the message isn't recorded in the
	1692	// log file, an empty string is returned.
	1693	func (uc upstreamConn) appendLog(entity string, msg irc.Message) (msgID string) {
[423]	1694	if uc.user.msgStore == nil {
[428]	1695	return ""
[178]	1696	}
[486]	1697
	1698	entityCM := uc.network.casemap(entity)
	1699	if entityCM == "nickserv" {
[468]	1700	// The messages sent/received from NickServ may contain
	1701	// security-related information (like passwords). Don't store these.
	1702	return ""
	1703	}
[215]	1704
[485]	1705	if !uc.network.delivered.HasTarget(entity) {
[482]	1706	// This is the first message we receive from this target. Save the last
	1707	// message ID in delivery receipts, so that we can send the new message
	1708	// in the backlog if an offline client reconnects.
[478]	1709	lastID, err := uc.user.msgStore.LastMsgID(uc.network, entityCM, time.Now())
[409]	1710	if err != nil {
	1711	uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
[428]	1712	return ""
[409]	1713	}
	1714
[489]	1715	uc.network.delivered.ForEachClient(func(clientName string) {
[485]	1716	uc.network.delivered.StoreID(entity, clientName, lastID)
[489]	1717	})
[253]	1718	}
	1719
[478]	1720	msgID, err := uc.user.msgStore.Append(uc.network, entityCM, msg)
[409]	1721	if err != nil {
	1722	uc.logger.Printf("failed to log message: %v", err)
[428]	1723	return ""
[409]	1724	}
[406]	1725
[428]	1726	return msgID
[253]	1727	}
	1728
[409]	1729	// produce appends a message to the logs and forwards it to connected downstream
	1730	// connections.
[245]	1731	//
	1732	// If origin is not nil and origin doesn't support echo-message, the message is
	1733	// forwarded to all connections except origin.
[239]	1734	func (uc upstreamConn) produce(target string, msg irc.Message, origin *downstreamConn) {
[428]	1735	var msgID string
[239]	1736	if target != "" {
[428]	1737	msgID = uc.appendLog(target, msg)
[239]	1738	}
	1739
[284]	1740	// Don't forward messages if it's a detached channel
[478]	1741	ch := uc.network.channels.Value(target)
[499]	1742	detached := ch != nil && ch.Detached
[284]	1743
[227]	1744	uc.forEachDownstream(func(dc *downstreamConn) {
[499]	1745	if !detached && (dc != origin \|\| dc.caps["echo-message"]) {
[428]	1746	dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
	1747	} else {
	1748	dc.advanceMessageWithID(msg, msgID)
[238]	1749	}
[227]	1750	})
[226]	1751	}
	1752
[198]	1753	func (uc *upstreamConn) updateAway() {
	1754	away := true
	1755	uc.forEachDownstream(func(*downstreamConn) {
	1756	away = false
	1757	})
	1758	if away == uc.away {
	1759	return
	1760	}
	1761	if away {
	1762	uc.SendMessage(&irc.Message{
	1763	Command: "AWAY",
	1764	Params: []string{"Auto away"},
	1765	})
	1766	} else {
	1767	uc.SendMessage(&irc.Message{
	1768	Command: "AWAY",
	1769	})
	1770	}
	1771	uc.away = away
	1772	}
[435]	1773
	1774	func (uc *upstreamConn) updateChannelAutoDetach(name string) {
[478]	1775	uch := uc.channels.Value(name)
	1776	if uch == nil {
	1777	return
[435]	1778	}
[478]	1779	ch := uc.network.channels.Value(name)
	1780	if ch == nil \|\| ch.Detached {
	1781	return
	1782	}
	1783	uch.updateAutoDetach(ch.DetachAfter)
[435]	1784	}

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