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source: code/trunk/upstream.go@ 468

Last change on this file since 468 was 468, checked in by contact, 4 years ago

Don't store history for NickServ

Closes: https://todo.sr.ht/~emersion/soju/104

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"
[288]	16	"unicode"
	17	"unicode/utf8"
[13]	18
[95]	19	"github.com/emersion/go-sasl"
[13]	20	"gopkg.in/irc.v3"
	21	)
	22
[282]	23	// permanentUpstreamCaps is the static list of upstream capabilities always
	24	// requested when supported.
	25	var permanentUpstreamCaps = map[string]bool{
	26	"away-notify": true,
	27	"batch": true,
[419]	28	"extended-join": true,
[448]	29	"invite-notify": true,
[282]	30	"labeled-response": true,
	31	"message-tags": true,
[292]	32	"multi-prefix": true,
[282]	33	"server-time": true,
	34	}
	35
[399]	36	type registrationError string
	37
	38	func (err registrationError) Error() string {
	39	return fmt.Sprintf("registration error: %v", string(err))
	40	}
	41
[19]	42	type upstreamChannel struct {
[162]	43	Name string
	44	conn *upstreamConn
	45	Topic string
[405]	46	TopicWho *irc.Prefix
[162]	47	TopicTime time.Time
	48	Status channelStatus
	49	modes channelModes
	50	creationTime string
[292]	51	Members map[string]*memberships
[162]	52	complete bool
[435]	53	detachTimer *time.Timer
[19]	54	}
	55
[435]	56	func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
	57	if uc.detachTimer != nil {
	58	uc.detachTimer.Stop()
	59	uc.detachTimer = nil
	60	}
	61
	62	if dur == 0 {
	63	return
	64	}
	65
	66	uc.detachTimer = time.AfterFunc(dur, func() {
	67	uc.conn.network.user.events <- eventChannelDetach{
	68	uc: uc.conn,
	69	name: uc.Name,
	70	}
	71	})
	72	}
	73
[13]	74	type upstreamConn struct {
[210]	75	conn
[16]	76
[210]	77	network *network
	78	user *user
	79
[16]	80	serverName string
	81	availableUserModes string
[139]	82	availableChannelModes map[byte]channelModeType
	83	availableChannelTypes string
	84	availableMemberships []membership
[460]	85	isupport map[string]*string
[19]	86
[277]	87	registered bool
	88	nick string
	89	username string
	90	realname string
	91	modes userModes
	92	channels map[string]*upstreamChannel
	93	supportedCaps map[string]string
[278]	94	caps map[string]bool
[277]	95	batches map[string]batch
	96	away bool
[278]	97	nextLabelID uint64
[95]	98
	99	saslClient sasl.Client
	100	saslStarted bool
[177]	101
	102	// set of LIST commands in progress, per downstream
	103	pendingLISTDownstreamSet map[uint64]struct{}
[13]	104	}
	105
[77]	106	func connectToUpstream(network network) (upstreamConn, error) {
	107	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	108
[352]	109	dialer := net.Dialer{Timeout: connectTimeout}
[269]	110
[457]	111	u, err := network.URL()
[352]	112	if err != nil {
[457]	113	return nil, err
[352]	114	}
[206]	115
[269]	116	var netConn net.Conn
[352]	117	switch u.Scheme {
[269]	118	case "ircs":
[352]	119	addr := u.Host
[381]	120	host, _, err := net.SplitHostPort(u.Host)
	121	if err != nil {
	122	host = u.Host
	123	addr = u.Host + ":6697"
[269]	124	}
	125
	126	logger.Printf("connecting to TLS server at address %q", addr)
[307]	127
[455]	128	tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
[307]	129	if network.SASL.Mechanism == "EXTERNAL" {
	130	if network.SASL.External.CertBlob == nil {
	131	return nil, fmt.Errorf("missing certificate for authentication")
	132	}
	133	if network.SASL.External.PrivKeyBlob == nil {
	134	return nil, fmt.Errorf("missing private key for authentication")
	135	}
	136	key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
	137	if err != nil {
	138	return nil, fmt.Errorf("failed to parse private key: %v", err)
	139	}
[381]	140	tlsConfig.Certificates = []tls.Certificate{
	141	{
	142	Certificate: [][]byte{network.SASL.External.CertBlob},
	143	PrivateKey: key.(crypto.PrivateKey),
[307]	144	},
	145	}
	146	logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
	147	}
	148
[381]	149	netConn, err = dialer.Dial("tcp", addr)
[352]	150	if err != nil {
	151	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	152	}
[381]	153
	154	// Don't do the TLS handshake immediately, because we need to register
	155	// the new connection with identd ASAP. See:
	156	// https://todo.sr.ht/~emersion/soju/69#event-41859
	157	netConn = tls.Client(netConn, tlsConfig)
[270]	158	case "irc+insecure":
[352]	159	addr := u.Host
[351]	160	if _, _, err := net.SplitHostPort(addr); err != nil {
[270]	161	addr = addr + ":6667"
	162	}
	163
	164	logger.Printf("connecting to plain-text server at address %q", addr)
	165	netConn, err = dialer.Dial("tcp", addr)
[352]	166	if err != nil {
	167	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	168	}
[369]	169	case "irc+unix", "unix":
[353]	170	logger.Printf("connecting to Unix socket at path %q", u.Path)
	171	netConn, err = dialer.Dial("unix", u.Path)
	172	if err != nil {
	173	return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
	174	}
[269]	175	default:
[352]	176	return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
[269]	177	}
[33]	178
[398]	179	options := connOptions{
[402]	180	Logger: logger,
[398]	181	RateLimitDelay: upstreamMessageDelay,
	182	RateLimitBurst: upstreamMessageBurst,
	183	}
	184
[55]	185	uc := &upstreamConn{
[398]	186	conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
[177]	187	network: network,
	188	user: network.user,
	189	channels: make(map[string]*upstreamChannel),
[277]	190	supportedCaps: make(map[string]string),
[278]	191	caps: make(map[string]bool),
[177]	192	batches: make(map[string]batch),
	193	availableChannelTypes: stdChannelTypes,
	194	availableChannelModes: stdChannelModes,
	195	availableMemberships: stdMemberships,
[460]	196	isupport: make(map[string]*string),
[177]	197	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[33]	198	}
[55]	199	return uc, nil
[33]	200	}
	201
[73]	202	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
[218]	203	uc.network.forEachDownstream(f)
[73]	204	}
	205
[161]	206	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	207	uc.forEachDownstream(func(dc *downstreamConn) {
	208	if id != 0 && id != dc.id {
	209	return
	210	}
	211	f(dc)
	212	})
	213	}
	214
[55]	215	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	216	ch, ok := uc.channels[name]
[19]	217	if !ok {
	218	return nil, fmt.Errorf("unknown channel %q", name)
	219	}
	220	return ch, nil
	221	}
	222
[129]	223	func (uc *upstreamConn) isChannel(entity string) bool {
[454]	224	return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
[129]	225	}
	226
[181]	227	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	228	for _, pl := range uc.user.pendingLISTs {
	229	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	230	continue
	231	}
	232	return &pl
	233	}
	234	return nil
	235	}
	236
[181]	237	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	238	found = false
	239	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	240	pl := uc.user.pendingLISTs[i]
	241	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	242	continue
	243	}
	244	delete(pl.pendingCommands, uc.network.ID)
	245	if len(pl.pendingCommands) == 0 {
	246	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	247	i--
	248	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	249	dc.SendMessage(&irc.Message{
	250	Prefix: dc.srv.prefix(),
	251	Command: irc.RPL_LISTEND,
	252	Params: []string{dc.nick, "End of /LIST"},
	253	})
	254	})
	255	}
	256	found = true
	257	if !all {
	258	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	259	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	260	uc.trySendLIST(pl.downstreamID)
[177]	261	})
	262	return
	263	}
	264	}
	265	return
	266	}
	267
[181]	268	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	269	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	270	// a LIST command is already pending
	271	// we will try again when that command is completed
	272	return
	273	}
	274
	275	for _, pl := range uc.user.pendingLISTs {
	276	if pl.downstreamID != downstreamID {
	277	continue
	278	}
	279	// this is the first pending LIST command list of the downstream
	280	listCommand, ok := pl.pendingCommands[uc.network.ID]
	281	if !ok {
	282	// there is no command for this upstream in these LIST commands
	283	// do not send anything
	284	continue
	285	}
	286	// there is a command for this upstream in these LIST commands
	287	// send it now
	288
	289	uc.SendMessageLabeled(downstreamID, listCommand)
	290
	291	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	292	return
	293	}
	294	}
	295
[292]	296	func (uc upstreamConn) parseMembershipPrefix(s string) (ms memberships, nick string) {
	297	memberships := make(memberships, 0, 4)
	298	i := 0
[139]	299	for _, m := range uc.availableMemberships {
[292]	300	if i >= len(s) {
	301	break
[139]	302	}
[292]	303	if s[i] == m.Prefix {
	304	memberships = append(memberships, m)
	305	i++
	306	}
[139]	307	}
[292]	308	return &memberships, s[i:]
[139]	309	}
	310
[288]	311	func isWordBoundary(r rune) bool {
	312	switch r {
	313	case '-', '_', '\|':
	314	return false
	315	case '\u00A0':
	316	return true
	317	default:
	318	return !unicode.IsLetter(r) && !unicode.IsNumber(r)
	319	}
	320	}
	321
	322	func isHighlight(text, nick string) bool {
	323	for {
	324	i := strings.Index(text, nick)
	325	if i < 0 {
	326	return false
	327	}
	328
	329	// Detect word boundaries
	330	var left, right rune
	331	if i > 0 {
	332	left, _ = utf8.DecodeLastRuneInString(text[:i])
	333	}
	334	if i < len(text) {
	335	right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
	336	}
	337	if isWordBoundary(left) && isWordBoundary(right) {
	338	return true
	339	}
	340
	341	text = text[i+len(nick):]
	342	}
	343	}
	344
[55]	345	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	346	var label string
	347	if l, ok := msg.GetTag("label"); ok {
	348	label = l
	349	}
	350
[153]	351	var msgBatch *batch
	352	if batchName, ok := msg.GetTag("batch"); ok {
	353	b, ok := uc.batches[batchName]
	354	if !ok {
	355	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	356	}
	357	msgBatch = &b
[155]	358	if label == "" {
	359	label = msgBatch.Label
	360	}
[443]	361	delete(msg.Tags, "batch")
[153]	362	}
	363
[161]	364	var downstreamID uint64 = 0
[155]	365	if label != "" {
	366	var labelOffset uint64
[161]	367	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	368	if err == nil && n < 2 {
	369	err = errors.New("not enough arguments")
	370	}
	371	if err != nil {
	372	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	373	}
	374	}
	375
[216]	376	if _, ok := msg.Tags["time"]; !ok {
[240]	377	msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[216]	378	}
	379
[13]	380	switch msg.Command {
	381	case "PING":
[60]	382	uc.SendMessage(&irc.Message{
[13]	383	Command: "PONG",
[68]	384	Params: msg.Params,
[60]	385	})
[33]	386	return nil
[303]	387	case "NOTICE", "PRIVMSG", "TAGMSG":
[273]	388	if msg.Prefix == nil {
	389	return fmt.Errorf("expected a prefix")
	390	}
	391
[286]	392	var entity, text string
[303]	393	if msg.Command != "TAGMSG" {
	394	if err := parseMessageParams(msg, &entity, &text); err != nil {
	395	return err
	396	}
	397	} else {
	398	if err := parseMessageParams(msg, &entity); err != nil {
	399	return err
	400	}
[286]	401	}
	402
	403	if msg.Prefix.Name == serviceNick {
	404	uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
	405	break
	406	}
	407	if entity == serviceNick {
	408	uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
	409	break
	410	}
	411
[171]	412	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
[239]	413	uc.produce("", msg, nil)
[303]	414	} else { // regular user message
[217]	415	target := entity
	416	if target == uc.nick {
[178]	417	target = msg.Prefix.Name
	418	}
[287]	419
[435]	420	if ch, ok := uc.network.channels[target]; ok {
	421	if ch.Detached {
	422	uc.handleDetachedMessage(msg.Prefix.Name, text, ch)
	423	}
	424
	425	highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
	426	if ch.DetachOn == FilterMessage \|\| ch.DetachOn == FilterDefault \|\| (ch.DetachOn == FilterHighlight && highlight) {
	427	uc.updateChannelAutoDetach(target)
	428	}
[287]	429	}
[435]	430
	431	uc.produce(target, msg, nil)
[171]	432	}
[92]	433	case "CAP":
[95]	434	var subCmd string
	435	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	436	return err
[92]	437	}
[95]	438	subCmd = strings.ToUpper(subCmd)
	439	subParams := msg.Params[2:]
	440	switch subCmd {
	441	case "LS":
	442	if len(subParams) < 1 {
	443	return newNeedMoreParamsError(msg.Command)
	444	}
[281]	445	caps := subParams[len(subParams)-1]
[95]	446	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	447
[281]	448	uc.handleSupportedCaps(caps)
[92]	449
[95]	450	if more {
	451	break // wait to receive all capabilities
	452	}
	453
[281]	454	uc.requestCaps()
[152]	455
[95]	456	if uc.requestSASL() {
	457	break // we'll send CAP END after authentication is completed
	458	}
	459
[92]	460	uc.SendMessage(&irc.Message{
	461	Command: "CAP",
	462	Params: []string{"END"},
	463	})
[95]	464	case "ACK", "NAK":
	465	if len(subParams) < 1 {
	466	return newNeedMoreParamsError(msg.Command)
	467	}
	468	caps := strings.Fields(subParams[0])
	469
	470	for _, name := range caps {
	471	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	472	return err
	473	}
	474	}
	475
[281]	476	if uc.registered {
	477	uc.forEachDownstream(func(dc *downstreamConn) {
	478	dc.updateSupportedCaps()
	479	})
	480	}
	481	case "NEW":
	482	if len(subParams) < 1 {
	483	return newNeedMoreParamsError(msg.Command)
	484	}
	485	uc.handleSupportedCaps(subParams[0])
	486	uc.requestCaps()
	487	case "DEL":
	488	if len(subParams) < 1 {
	489	return newNeedMoreParamsError(msg.Command)
	490	}
	491	caps := strings.Fields(subParams[0])
	492
	493	for _, c := range caps {
	494	delete(uc.supportedCaps, c)
	495	delete(uc.caps, c)
	496	}
	497
	498	if uc.registered {
	499	uc.forEachDownstream(func(dc *downstreamConn) {
	500	dc.updateSupportedCaps()
	501	})
	502	}
[95]	503	default:
	504	uc.logger.Printf("unhandled message: %v", msg)
[92]	505	}
[95]	506	case "AUTHENTICATE":
	507	if uc.saslClient == nil {
	508	return fmt.Errorf("received unexpected AUTHENTICATE message")
	509	}
	510
	511	// TODO: if a challenge is 400 bytes long, buffer it
	512	var challengeStr string
	513	if err := parseMessageParams(msg, &challengeStr); err != nil {
	514	uc.SendMessage(&irc.Message{
	515	Command: "AUTHENTICATE",
	516	Params: []string{"*"},
	517	})
	518	return err
	519	}
	520
	521	var challenge []byte
	522	if challengeStr != "+" {
	523	var err error
	524	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	525	if err != nil {
	526	uc.SendMessage(&irc.Message{
	527	Command: "AUTHENTICATE",
	528	Params: []string{"*"},
	529	})
	530	return err
	531	}
	532	}
	533
	534	var resp []byte
	535	var err error
	536	if !uc.saslStarted {
	537	_, resp, err = uc.saslClient.Start()
	538	uc.saslStarted = true
	539	} else {
	540	resp, err = uc.saslClient.Next(challenge)
	541	}
	542	if err != nil {
	543	uc.SendMessage(&irc.Message{
	544	Command: "AUTHENTICATE",
	545	Params: []string{"*"},
	546	})
	547	return err
	548	}
	549
	550	// TODO: send response in multiple chunks if >= 400 bytes
	551	var respStr = "+"
[318]	552	if len(resp) != 0 {
[95]	553	respStr = base64.StdEncoding.EncodeToString(resp)
	554	}
	555
	556	uc.SendMessage(&irc.Message{
	557	Command: "AUTHENTICATE",
	558	Params: []string{respStr},
	559	})
[125]	560	case irc.RPL_LOGGEDIN:
[95]	561	var account string
	562	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	563	return err
	564	}
	565	uc.logger.Printf("logged in with account %q", account)
[125]	566	case irc.RPL_LOGGEDOUT:
[95]	567	uc.logger.Printf("logged out")
[125]	568	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	569	var info string
	570	if err := parseMessageParams(msg, nil, &info); err != nil {
	571	return err
	572	}
	573	switch msg.Command {
[125]	574	case irc.ERR_NICKLOCKED:
[95]	575	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	576	case irc.ERR_SASLFAIL:
[95]	577	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	578	case irc.ERR_SASLTOOLONG:
[95]	579	uc.logger.Printf("SASL message too long: %v", info)
	580	}
	581
	582	uc.saslClient = nil
	583	uc.saslStarted = false
	584
	585	uc.SendMessage(&irc.Message{
	586	Command: "CAP",
	587	Params: []string{"END"},
	588	})
[14]	589	case irc.RPL_WELCOME:
[55]	590	uc.registered = true
	591	uc.logger.Printf("connection registered")
[19]	592
[276]	593	uc.forEachDownstream(func(dc *downstreamConn) {
	594	dc.updateSupportedCaps()
	595	})
	596
[310]	597	if len(uc.network.channels) > 0 {
[350]	598	var channels, keys []string
[310]	599	for _, ch := range uc.network.channels {
[350]	600	channels = append(channels, ch.Name)
[310]	601	keys = append(keys, ch.Key)
	602	}
[350]	603
	604	for _, msg := range join(channels, keys) {
	605	uc.SendMessage(msg)
	606	}
[19]	607	}
[16]	608	case irc.RPL_MYINFO:
[139]	609	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	610	return err
[16]	611	}
[139]	612	case irc.RPL_ISUPPORT:
	613	if err := parseMessageParams(msg, nil, nil); err != nil {
	614	return err
[16]	615	}
[463]	616
	617	var downstreamIsupport []string
[139]	618	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	619	parameter := token
[460]	620	var negate, hasValue bool
	621	var value string
[139]	622	if strings.HasPrefix(token, "-") {
	623	negate = true
	624	token = token[1:]
[459]	625	} else if i := strings.IndexByte(token, '='); i >= 0 {
	626	parameter = token[:i]
	627	value = token[i+1:]
[460]	628	hasValue = true
[139]	629	}
[460]	630
	631	if hasValue {
	632	uc.isupport[parameter] = &value
	633	} else if !negate {
	634	uc.isupport[parameter] = nil
	635	} else {
	636	delete(uc.isupport, parameter)
	637	}
	638
[462]	639	var err error
	640	switch parameter {
	641	case "CHANMODES":
	642	if !negate {
	643	err = uc.handleChanModes(value)
	644	} else {
	645	uc.availableChannelModes = stdChannelModes
	646	}
	647	case "CHANTYPES":
	648	if !negate {
[139]	649	uc.availableChannelTypes = value
[462]	650	} else {
	651	uc.availableChannelTypes = stdChannelTypes
[139]	652	}
[462]	653	case "PREFIX":
	654	if !negate {
	655	err = uc.handleMemberships(value)
	656	} else {
	657	uc.availableMemberships = stdMemberships
	658	}
[139]	659	}
[462]	660	if err != nil {
	661	return err
	662	}
[463]	663
	664	if passthroughIsupport[parameter] {
	665	downstreamIsupport = append(downstreamIsupport, token)
	666	}
[139]	667	}
[463]	668
	669	uc.forEachDownstream(func(dc *downstreamConn) {
	670	if dc.network == nil {
	671	return
	672	}
	673	msgs := generateIsupport(dc.srv.prefix(), dc.nick, downstreamIsupport)
	674	for _, msg := range msgs {
	675	dc.SendMessage(msg)
	676	}
	677	})
[153]	678	case "BATCH":
	679	var tag string
	680	if err := parseMessageParams(msg, &tag); err != nil {
	681	return err
	682	}
	683
	684	if strings.HasPrefix(tag, "+") {
	685	tag = tag[1:]
	686	if _, ok := uc.batches[tag]; ok {
	687	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	688	}
	689	var batchType string
	690	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	691	return err
	692	}
[155]	693	label := label
	694	if label == "" && msgBatch != nil {
	695	label = msgBatch.Label
	696	}
[153]	697	uc.batches[tag] = batch{
	698	Type: batchType,
	699	Params: msg.Params[2:],
	700	Outer: msgBatch,
[155]	701	Label: label,
[153]	702	}
	703	} else if strings.HasPrefix(tag, "-") {
	704	tag = tag[1:]
	705	if _, ok := uc.batches[tag]; !ok {
	706	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	707	}
	708	delete(uc.batches, tag)
	709	} else {
	710	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	711	}
[42]	712	case "NICK":
[83]	713	if msg.Prefix == nil {
	714	return fmt.Errorf("expected a prefix")
	715	}
	716
[43]	717	var newNick string
	718	if err := parseMessageParams(msg, &newNick); err != nil {
	719	return err
[42]	720	}
	721
[244]	722	me := false
[55]	723	if msg.Prefix.Name == uc.nick {
	724	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
[244]	725	me = true
[55]	726	uc.nick = newNick
[42]	727	}
	728
[55]	729	for _, ch := range uc.channels {
[292]	730	if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
[42]	731	delete(ch.Members, msg.Prefix.Name)
[292]	732	ch.Members[newNick] = memberships
[215]	733	uc.appendLog(ch.Name, msg)
[42]	734	}
	735	}
[82]	736
[244]	737	if !me {
[82]	738	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	739	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[82]	740	})
[296]	741	} else {
	742	uc.forEachDownstream(func(dc *downstreamConn) {
	743	dc.updateNick()
	744	})
[82]	745	}
[69]	746	case "JOIN":
	747	if msg.Prefix == nil {
	748	return fmt.Errorf("expected a prefix")
	749	}
[42]	750
[43]	751	var channels string
	752	if err := parseMessageParams(msg, &channels); err != nil {
	753	return err
[19]	754	}
[34]	755
[43]	756	for _, ch := range strings.Split(channels, ",") {
[55]	757	if msg.Prefix.Name == uc.nick {
	758	uc.logger.Printf("joined channel %q", ch)
	759	uc.channels[ch] = &upstreamChannel{
[34]	760	Name: ch,
[55]	761	conn: uc,
[292]	762	Members: make(map[string]*memberships),
[34]	763	}
[435]	764	uc.updateChannelAutoDetach(ch)
[139]	765
	766	uc.SendMessage(&irc.Message{
	767	Command: "MODE",
	768	Params: []string{ch},
	769	})
[34]	770	} else {
[55]	771	ch, err := uc.getChannel(ch)
[34]	772	if err != nil {
	773	return err
	774	}
[294]	775	ch.Members[msg.Prefix.Name] = &memberships{}
[19]	776	}
[69]	777
[245]	778	chMsg := msg.Copy()
	779	chMsg.Params[0] = ch
	780	uc.produce(ch, chMsg, nil)
[19]	781	}
[69]	782	case "PART":
	783	if msg.Prefix == nil {
	784	return fmt.Errorf("expected a prefix")
	785	}
[34]	786
[43]	787	var channels string
	788	if err := parseMessageParams(msg, &channels); err != nil {
	789	return err
[34]	790	}
	791
[43]	792	for _, ch := range strings.Split(channels, ",") {
[55]	793	if msg.Prefix.Name == uc.nick {
	794	uc.logger.Printf("parted channel %q", ch)
[435]	795	if uch, ok := uc.channels[ch]; ok {
	796	delete(uc.channels, ch)
	797	uch.updateAutoDetach(0)
	798	}
[34]	799	} else {
[55]	800	ch, err := uc.getChannel(ch)
[34]	801	if err != nil {
	802	return err
	803	}
	804	delete(ch.Members, msg.Prefix.Name)
	805	}
[69]	806
[245]	807	chMsg := msg.Copy()
	808	chMsg.Params[0] = ch
	809	uc.produce(ch, chMsg, nil)
[34]	810	}
[159]	811	case "KICK":
	812	if msg.Prefix == nil {
	813	return fmt.Errorf("expected a prefix")
	814	}
	815
	816	var channel, user string
	817	if err := parseMessageParams(msg, &channel, &user); err != nil {
	818	return err
	819	}
	820
	821	if user == uc.nick {
	822	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	823	delete(uc.channels, channel)
	824	} else {
	825	ch, err := uc.getChannel(channel)
	826	if err != nil {
	827	return err
	828	}
	829	delete(ch.Members, user)
	830	}
	831
[245]	832	uc.produce(channel, msg, nil)
[83]	833	case "QUIT":
	834	if msg.Prefix == nil {
	835	return fmt.Errorf("expected a prefix")
	836	}
	837
	838	if msg.Prefix.Name == uc.nick {
	839	uc.logger.Printf("quit")
	840	}
	841
	842	for _, ch := range uc.channels {
[178]	843	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	844	delete(ch.Members, msg.Prefix.Name)
	845
[215]	846	uc.appendLog(ch.Name, msg)
[178]	847	}
[83]	848	}
	849
	850	if msg.Prefix.Name != uc.nick {
	851	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	852	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[83]	853	})
	854	}
[19]	855	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	856	var name, topic string
	857	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	858	return err
[19]	859	}
[55]	860	ch, err := uc.getChannel(name)
[19]	861	if err != nil {
	862	return err
	863	}
	864	if msg.Command == irc.RPL_TOPIC {
[43]	865	ch.Topic = topic
[19]	866	} else {
	867	ch.Topic = ""
	868	}
	869	case "TOPIC":
[405]	870	if msg.Prefix == nil {
	871	return fmt.Errorf("expected a prefix")
	872	}
	873
[43]	874	var name string
[74]	875	if err := parseMessageParams(msg, &name); err != nil {
[43]	876	return err
[19]	877	}
[55]	878	ch, err := uc.getChannel(name)
[19]	879	if err != nil {
	880	return err
	881	}
	882	if len(msg.Params) > 1 {
	883	ch.Topic = msg.Params[1]
[405]	884	ch.TopicWho = msg.Prefix.Copy()
	885	ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
[19]	886	} else {
	887	ch.Topic = ""
	888	}
[245]	889	uc.produce(ch.Name, msg, nil)
[139]	890	case "MODE":
	891	var name, modeStr string
	892	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	893	return err
	894	}
	895
	896	if !uc.isChannel(name) { // user mode change
	897	if name != uc.nick {
	898	return fmt.Errorf("received MODE message for unknown nick %q", name)
	899	}
	900	return uc.modes.Apply(modeStr)
	901	// TODO: notify downstreams about user mode change?
	902	} else { // channel mode change
	903	ch, err := uc.getChannel(name)
	904	if err != nil {
	905	return err
	906	}
	907
[293]	908	needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
	909	if err != nil {
	910	return err
[139]	911	}
	912
[293]	913	uc.appendLog(ch.Name, msg)
	914
[338]	915	if ch, ok := uc.network.channels[name]; !ok \|\| !ch.Detached {
	916	uc.forEachDownstream(func(dc *downstreamConn) {
	917	params := make([]string, len(msg.Params))
	918	params[0] = dc.marshalEntity(uc.network, name)
	919	params[1] = modeStr
	920
	921	copy(params[2:], msg.Params[2:])
	922	for i, modeParam := range params[2:] {
	923	if _, ok := needMarshaling[i]; ok {
	924	params[2+i] = dc.marshalEntity(uc.network, modeParam)
	925	}
[293]	926	}
	927
[338]	928	dc.SendMessage(&irc.Message{
	929	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	930	Command: "MODE",
	931	Params: params,
	932	})
[293]	933	})
[338]	934	}
[139]	935	}
	936	case irc.RPL_UMODEIS:
	937	if err := parseMessageParams(msg, nil); err != nil {
	938	return err
	939	}
	940	modeStr := ""
	941	if len(msg.Params) > 1 {
	942	modeStr = msg.Params[1]
	943	}
	944
	945	uc.modes = ""
	946	if err := uc.modes.Apply(modeStr); err != nil {
	947	return err
	948	}
	949	// TODO: send RPL_UMODEIS to downstream connections when applicable
	950	case irc.RPL_CHANNELMODEIS:
	951	var channel string
	952	if err := parseMessageParams(msg, nil, &channel); err != nil {
	953	return err
	954	}
	955	modeStr := ""
	956	if len(msg.Params) > 2 {
	957	modeStr = msg.Params[2]
	958	}
	959
	960	ch, err := uc.getChannel(channel)
	961	if err != nil {
	962	return err
	963	}
	964
	965	firstMode := ch.modes == nil
	966	ch.modes = make(map[byte]string)
[293]	967	if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
[139]	968	return err
	969	}
	970	if firstMode {
[338]	971	if c, ok := uc.network.channels[channel]; !ok \|\| !c.Detached {
	972	modeStr, modeParams := ch.modes.Format()
[139]	973
[338]	974	uc.forEachDownstream(func(dc *downstreamConn) {
	975	params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
	976	params = append(params, modeParams...)
[139]	977
[338]	978	dc.SendMessage(&irc.Message{
	979	Prefix: dc.srv.prefix(),
	980	Command: irc.RPL_CHANNELMODEIS,
	981	Params: params,
	982	})
[139]	983	})
[338]	984	}
[139]	985	}
[162]	986	case rpl_creationtime:
	987	var channel, creationTime string
	988	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	989	return err
	990	}
	991
	992	ch, err := uc.getChannel(channel)
	993	if err != nil {
	994	return err
	995	}
	996
	997	firstCreationTime := ch.creationTime == ""
	998	ch.creationTime = creationTime
	999	if firstCreationTime {
	1000	uc.forEachDownstream(func(dc *downstreamConn) {
	1001	dc.SendMessage(&irc.Message{
	1002	Prefix: dc.srv.prefix(),
	1003	Command: rpl_creationtime,
[403]	1004	Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
[162]	1005	})
	1006	})
	1007	}
[19]	1008	case rpl_topicwhotime:
[43]	1009	var name, who, timeStr string
	1010	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	1011	return err
[19]	1012	}
[55]	1013	ch, err := uc.getChannel(name)
[19]	1014	if err != nil {
	1015	return err
	1016	}
[405]	1017	firstTopicWhoTime := ch.TopicWho == nil
	1018	ch.TopicWho = irc.ParsePrefix(who)
[43]	1019	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	1020	if err != nil {
	1021	return fmt.Errorf("failed to parse topic time: %v", err)
	1022	}
	1023	ch.TopicTime = time.Unix(sec, 0)
[405]	1024	if firstTopicWhoTime {
	1025	uc.forEachDownstream(func(dc *downstreamConn) {
	1026	topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
	1027	dc.SendMessage(&irc.Message{
	1028	Prefix: dc.srv.prefix(),
	1029	Command: rpl_topicwhotime,
	1030	Params: []string{
	1031	dc.nick,
	1032	dc.marshalEntity(uc.network, ch.Name),
	1033	topicWho.String(),
	1034	timeStr,
	1035	},
	1036	})
	1037	})
	1038	}
[177]	1039	case irc.RPL_LIST:
	1040	var channel, clients, topic string
	1041	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	1042	return err
	1043	}
	1044
[181]	1045	pl := uc.getPendingLIST()
[177]	1046	if pl == nil {
	1047	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	1048	}
	1049
	1050	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	1051	dc.SendMessage(&irc.Message{
	1052	Prefix: dc.srv.prefix(),
	1053	Command: irc.RPL_LIST,
[260]	1054	Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
[177]	1055	})
	1056	})
	1057	case irc.RPL_LISTEND:
[181]	1058	ok := uc.endPendingLISTs(false)
[177]	1059	if !ok {
	1060	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	1061	}
[19]	1062	case irc.RPL_NAMREPLY:
[43]	1063	var name, statusStr, members string
	1064	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	1065	return err
[19]	1066	}
[140]	1067
	1068	ch, ok := uc.channels[name]
	1069	if !ok {
	1070	// NAMES on a channel we have not joined, forward to downstream
[161]	1071	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1072	channel := dc.marshalEntity(uc.network, name)
[174]	1073	members := splitSpace(members)
[140]	1074	for i, member := range members {
[292]	1075	memberships, nick := uc.parseMembershipPrefix(member)
	1076	members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
[140]	1077	}
	1078	memberStr := strings.Join(members, " ")
	1079
	1080	dc.SendMessage(&irc.Message{
	1081	Prefix: dc.srv.prefix(),
	1082	Command: irc.RPL_NAMREPLY,
	1083	Params: []string{dc.nick, statusStr, channel, memberStr},
	1084	})
	1085	})
	1086	return nil
[19]	1087	}
	1088
[43]	1089	status, err := parseChannelStatus(statusStr)
[19]	1090	if err != nil {
	1091	return err
	1092	}
	1093	ch.Status = status
	1094
[174]	1095	for _, s := range splitSpace(members) {
[292]	1096	memberships, nick := uc.parseMembershipPrefix(s)
	1097	ch.Members[nick] = memberships
[19]	1098	}
	1099	case irc.RPL_ENDOFNAMES:
[43]	1100	var name string
	1101	if err := parseMessageParams(msg, nil, &name); err != nil {
	1102	return err
[25]	1103	}
[140]	1104
	1105	ch, ok := uc.channels[name]
	1106	if !ok {
	1107	// NAMES on a channel we have not joined, forward to downstream
[161]	1108	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1109	channel := dc.marshalEntity(uc.network, name)
[140]	1110
	1111	dc.SendMessage(&irc.Message{
	1112	Prefix: dc.srv.prefix(),
	1113	Command: irc.RPL_ENDOFNAMES,
	1114	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1115	})
	1116	})
	1117	return nil
[25]	1118	}
	1119
[34]	1120	if ch.complete {
	1121	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1122	}
[25]	1123	ch.complete = true
[27]	1124
[338]	1125	if c, ok := uc.network.channels[name]; !ok \|\| !c.Detached {
	1126	uc.forEachDownstream(func(dc *downstreamConn) {
	1127	forwardChannel(dc, ch)
	1128	})
	1129	}
[127]	1130	case irc.RPL_WHOREPLY:
	1131	var channel, username, host, server, nick, mode, trailing string
	1132	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1133	return err
	1134	}
	1135
	1136	parts := strings.SplitN(trailing, " ", 2)
	1137	if len(parts) != 2 {
	1138	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1139	}
	1140	realname := parts[1]
	1141	hops, err := strconv.Atoi(parts[0])
	1142	if err != nil {
	1143	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1144	}
	1145	hops++
	1146
	1147	trailing = strconv.Itoa(hops) + " " + realname
	1148
[161]	1149	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1150	channel := channel
	1151	if channel != "*" {
[260]	1152	channel = dc.marshalEntity(uc.network, channel)
[127]	1153	}
[260]	1154	nick := dc.marshalEntity(uc.network, nick)
[127]	1155	dc.SendMessage(&irc.Message{
	1156	Prefix: dc.srv.prefix(),
	1157	Command: irc.RPL_WHOREPLY,
	1158	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1159	})
	1160	})
	1161	case irc.RPL_ENDOFWHO:
	1162	var name string
	1163	if err := parseMessageParams(msg, nil, &name); err != nil {
	1164	return err
	1165	}
	1166
[161]	1167	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1168	name := name
	1169	if name != "*" {
	1170	// TODO: support WHO masks
[260]	1171	name = dc.marshalEntity(uc.network, name)
[127]	1172	}
	1173	dc.SendMessage(&irc.Message{
	1174	Prefix: dc.srv.prefix(),
	1175	Command: irc.RPL_ENDOFWHO,
[142]	1176	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1177	})
	1178	})
[128]	1179	case irc.RPL_WHOISUSER:
	1180	var nick, username, host, realname string
	1181	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1182	return err
	1183	}
	1184
[161]	1185	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1186	nick := dc.marshalEntity(uc.network, nick)
[128]	1187	dc.SendMessage(&irc.Message{
	1188	Prefix: dc.srv.prefix(),
	1189	Command: irc.RPL_WHOISUSER,
	1190	Params: []string{dc.nick, nick, username, host, "*", realname},
	1191	})
	1192	})
	1193	case irc.RPL_WHOISSERVER:
	1194	var nick, server, serverInfo string
	1195	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1196	return err
	1197	}
	1198
[161]	1199	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1200	nick := dc.marshalEntity(uc.network, nick)
[128]	1201	dc.SendMessage(&irc.Message{
	1202	Prefix: dc.srv.prefix(),
	1203	Command: irc.RPL_WHOISSERVER,
	1204	Params: []string{dc.nick, nick, server, serverInfo},
	1205	})
	1206	})
	1207	case irc.RPL_WHOISOPERATOR:
	1208	var nick string
	1209	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1210	return err
	1211	}
	1212
[161]	1213	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1214	nick := dc.marshalEntity(uc.network, nick)
[128]	1215	dc.SendMessage(&irc.Message{
	1216	Prefix: dc.srv.prefix(),
	1217	Command: irc.RPL_WHOISOPERATOR,
	1218	Params: []string{dc.nick, nick, "is an IRC operator"},
	1219	})
	1220	})
	1221	case irc.RPL_WHOISIDLE:
	1222	var nick string
	1223	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1224	return err
	1225	}
	1226
[161]	1227	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1228	nick := dc.marshalEntity(uc.network, nick)
[128]	1229	params := []string{dc.nick, nick}
	1230	params = append(params, msg.Params[2:]...)
	1231	dc.SendMessage(&irc.Message{
	1232	Prefix: dc.srv.prefix(),
	1233	Command: irc.RPL_WHOISIDLE,
	1234	Params: params,
	1235	})
	1236	})
	1237	case irc.RPL_WHOISCHANNELS:
	1238	var nick, channelList string
	1239	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1240	return err
	1241	}
[174]	1242	channels := splitSpace(channelList)
[128]	1243
[161]	1244	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1245	nick := dc.marshalEntity(uc.network, nick)
[128]	1246	channelList := make([]string, len(channels))
	1247	for i, channel := range channels {
[139]	1248	prefix, channel := uc.parseMembershipPrefix(channel)
[260]	1249	channel = dc.marshalEntity(uc.network, channel)
[292]	1250	channelList[i] = prefix.Format(dc) + channel
[128]	1251	}
	1252	channels := strings.Join(channelList, " ")
	1253	dc.SendMessage(&irc.Message{
	1254	Prefix: dc.srv.prefix(),
	1255	Command: irc.RPL_WHOISCHANNELS,
	1256	Params: []string{dc.nick, nick, channels},
	1257	})
	1258	})
	1259	case irc.RPL_ENDOFWHOIS:
	1260	var nick string
	1261	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1262	return err
	1263	}
	1264
[161]	1265	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1266	nick := dc.marshalEntity(uc.network, nick)
[128]	1267	dc.SendMessage(&irc.Message{
	1268	Prefix: dc.srv.prefix(),
	1269	Command: irc.RPL_ENDOFWHOIS,
[142]	1270	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1271	})
	1272	})
[115]	1273	case "INVITE":
[273]	1274	var nick, channel string
[115]	1275	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1276	return err
	1277	}
	1278
[448]	1279	weAreInvited := nick == uc.nick
	1280
[115]	1281	uc.forEachDownstream(func(dc *downstreamConn) {
[448]	1282	if !weAreInvited && !dc.caps["invite-notify"] {
	1283	return
	1284	}
[115]	1285	dc.SendMessage(&irc.Message{
[260]	1286	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
[115]	1287	Command: "INVITE",
[260]	1288	Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[115]	1289	})
	1290	})
[163]	1291	case irc.RPL_INVITING:
[273]	1292	var nick, channel string
[304]	1293	if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
[163]	1294	return err
	1295	}
	1296
	1297	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1298	dc.SendMessage(&irc.Message{
	1299	Prefix: dc.srv.prefix(),
	1300	Command: irc.RPL_INVITING,
[260]	1301	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[163]	1302	})
	1303	})
[272]	1304	case irc.RPL_AWAY:
	1305	var nick, reason string
	1306	if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
	1307	return err
	1308	}
	1309
[274]	1310	uc.forEachDownstream(func(dc *downstreamConn) {
[272]	1311	dc.SendMessage(&irc.Message{
	1312	Prefix: dc.srv.prefix(),
	1313	Command: irc.RPL_AWAY,
	1314	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
	1315	})
	1316	})
[276]	1317	case "AWAY":
	1318	if msg.Prefix == nil {
	1319	return fmt.Errorf("expected a prefix")
	1320	}
	1321
	1322	uc.forEachDownstream(func(dc *downstreamConn) {
	1323	if !dc.caps["away-notify"] {
	1324	return
	1325	}
	1326	dc.SendMessage(&irc.Message{
	1327	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	1328	Command: "AWAY",
	1329	Params: msg.Params,
	1330	})
	1331	})
[300]	1332	case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
	1333	var channel, mask string
	1334	if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
	1335	return err
	1336	}
	1337	var addNick, addTime string
	1338	if len(msg.Params) >= 5 {
	1339	addNick = msg.Params[3]
	1340	addTime = msg.Params[4]
	1341	}
	1342
	1343	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1344	channel := dc.marshalEntity(uc.network, channel)
	1345
	1346	var params []string
	1347	if addNick != "" && addTime != "" {
	1348	addNick := dc.marshalEntity(uc.network, addNick)
	1349	params = []string{dc.nick, channel, mask, addNick, addTime}
	1350	} else {
	1351	params = []string{dc.nick, channel, mask}
	1352	}
	1353
	1354	dc.SendMessage(&irc.Message{
	1355	Prefix: dc.srv.prefix(),
	1356	Command: msg.Command,
	1357	Params: params,
	1358	})
	1359	})
	1360	case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
	1361	var channel, trailing string
	1362	if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
	1363	return err
	1364	}
	1365
	1366	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1367	upstreamChannel := dc.marshalEntity(uc.network, channel)
	1368	dc.SendMessage(&irc.Message{
	1369	Prefix: dc.srv.prefix(),
	1370	Command: msg.Command,
	1371	Params: []string{dc.nick, upstreamChannel, trailing},
	1372	})
	1373	})
[302]	1374	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1375	var command, reason string
	1376	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1377	return err
	1378	}
	1379
	1380	if command == "LIST" {
	1381	ok := uc.endPendingLISTs(false)
	1382	if !ok {
	1383	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1384	}
	1385	}
	1386
[355]	1387	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1388	dc.SendMessage(&irc.Message{
	1389	Prefix: uc.srv.prefix(),
	1390	Command: msg.Command,
	1391	Params: []string{dc.nick, command, reason},
[302]	1392	})
[355]	1393	})
[155]	1394	case "ACK":
	1395	// Ignore
[198]	1396	case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
	1397	// Ignore
[16]	1398	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1399	// Ignore
	1400	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1401	// Ignore
	1402	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1403	// Ignore
[177]	1404	case irc.RPL_LISTSTART:
	1405	// Ignore
[14]	1406	case rpl_localusers, rpl_globalusers:
	1407	// Ignore
[96]	1408	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1409	// Ignore
[390]	1410	case "ERROR":
	1411	var text string
	1412	if err := parseMessageParams(msg, &text); err != nil {
	1413	return err
	1414	}
	1415	return fmt.Errorf("fatal server error: %v", text)
[389]	1416	case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
[342]	1417	if !uc.registered {
[399]	1418	text := msg.Params[len(msg.Params)-1]
	1419	return registrationError(text)
[342]	1420	}
	1421	fallthrough
[13]	1422	default:
[95]	1423	uc.logger.Printf("unhandled message: %v", msg)
[355]	1424
	1425	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1426	// best effort marshaling for unknown messages, replies and errors:
	1427	// most numerics start with the user nick, marshal it if that's the case
	1428	// otherwise, conservately keep the params without marshaling
	1429	params := msg.Params
	1430	if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
	1431	if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
	1432	params[0] = dc.nick
[302]	1433	}
[355]	1434	}
	1435	dc.SendMessage(&irc.Message{
	1436	Prefix: uc.srv.prefix(),
	1437	Command: msg.Command,
	1438	Params: params,
[302]	1439	})
[355]	1440	})
[13]	1441	}
[14]	1442	return nil
[13]	1443	}
	1444
[435]	1445	func (uc upstreamConn) handleDetachedMessage(sender string, text string, ch Channel) {
	1446	highlight := sender != uc.nick && isHighlight(text, uc.nick)
	1447	if ch.RelayDetached == FilterMessage \|\| ((ch.RelayDetached == FilterHighlight \|\| ch.RelayDetached == FilterDefault) && highlight) {
	1448	uc.forEachDownstream(func(dc *downstreamConn) {
	1449	if highlight {
	1450	sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
	1451	} else {
	1452	sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
	1453	}
	1454	})
	1455	}
	1456	if ch.ReattachOn == FilterMessage \|\| (ch.ReattachOn == FilterHighlight && highlight) {
	1457	uc.network.attach(ch)
	1458	if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
	1459	uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
	1460	}
	1461	}
	1462	}
	1463
[458]	1464	func (uc *upstreamConn) handleChanModes(s string) error {
	1465	parts := strings.SplitN(s, ",", 5)
	1466	if len(parts) < 4 {
	1467	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
	1468	}
	1469	modes := make(map[byte]channelModeType)
	1470	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	1471	for j := 0; j < len(parts[i]); j++ {
	1472	mode := parts[i][j]
	1473	modes[mode] = mt
	1474	}
	1475	}
	1476	uc.availableChannelModes = modes
	1477	return nil
	1478	}
	1479
	1480	func (uc *upstreamConn) handleMemberships(s string) error {
	1481	if s == "" {
	1482	uc.availableMemberships = nil
	1483	return nil
	1484	}
	1485
	1486	if s[0] != '(' {
	1487	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1488	}
	1489	sep := strings.IndexByte(s, ')')
	1490	if sep < 0 \|\| len(s) != sep*2 {
	1491	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1492	}
	1493	memberships := make([]membership, len(s)/2-1)
	1494	for i := range memberships {
	1495	memberships[i] = membership{
	1496	Mode: s[i+1],
	1497	Prefix: s[sep+i+1],
	1498	}
	1499	}
	1500	uc.availableMemberships = memberships
	1501	return nil
	1502	}
	1503
[281]	1504	func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
	1505	caps := strings.Fields(capsStr)
	1506	for _, s := range caps {
	1507	kv := strings.SplitN(s, "=", 2)
	1508	k := strings.ToLower(kv[0])
	1509	var v string
	1510	if len(kv) == 2 {
	1511	v = kv[1]
	1512	}
	1513	uc.supportedCaps[k] = v
	1514	}
	1515	}
	1516
	1517	func (uc *upstreamConn) requestCaps() {
	1518	var requestCaps []string
[282]	1519	for c := range permanentUpstreamCaps {
[281]	1520	if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
	1521	requestCaps = append(requestCaps, c)
	1522	}
	1523	}
	1524
	1525	if uc.requestSASL() && !uc.caps["sasl"] {
	1526	requestCaps = append(requestCaps, "sasl")
	1527	}
	1528
[282]	1529	if len(requestCaps) == 0 {
	1530	return
	1531	}
	1532
	1533	uc.SendMessage(&irc.Message{
	1534	Command: "CAP",
	1535	Params: []string{"REQ", strings.Join(requestCaps, " ")},
	1536	})
	1537	}
	1538
	1539	func (uc *upstreamConn) requestSASL() bool {
	1540	if uc.network.SASL.Mechanism == "" {
	1541	return false
	1542	}
	1543
	1544	v, ok := uc.supportedCaps["sasl"]
	1545	if !ok {
	1546	return false
	1547	}
	1548	if v != "" {
	1549	mechanisms := strings.Split(v, ",")
	1550	found := false
	1551	for _, mech := range mechanisms {
	1552	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1553	found = true
	1554	break
	1555	}
	1556	}
	1557	if !found {
	1558	return false
	1559	}
	1560	}
	1561
	1562	return true
	1563	}
	1564
	1565	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1566	uc.caps[name] = ok
	1567
	1568	switch name {
	1569	case "sasl":
	1570	if !ok {
	1571	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1572	return nil
	1573	}
	1574
	1575	auth := &uc.network.SASL
	1576	switch auth.Mechanism {
	1577	case "PLAIN":
	1578	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1579	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
[307]	1580	case "EXTERNAL":
	1581	uc.logger.Printf("starting SASL EXTERNAL authentication")
	1582	uc.saslClient = sasl.NewExternalClient("")
[282]	1583	default:
	1584	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1585	}
	1586
[281]	1587	uc.SendMessage(&irc.Message{
[282]	1588	Command: "AUTHENTICATE",
	1589	Params: []string{auth.Mechanism},
[281]	1590	})
[282]	1591	default:
	1592	if permanentUpstreamCaps[name] {
	1593	break
	1594	}
	1595	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[281]	1596	}
[282]	1597	return nil
[281]	1598	}
	1599
[174]	1600	func splitSpace(s string) []string {
	1601	return strings.FieldsFunc(s, func(r rune) bool {
	1602	return r == ' '
	1603	})
	1604	}
	1605
[55]	1606	func (uc *upstreamConn) register() {
[77]	1607	uc.nick = uc.network.Nick
[457]	1608	uc.username = uc.network.GetUsername()
	1609	uc.realname = uc.network.GetRealname()
[77]	1610
[60]	1611	uc.SendMessage(&irc.Message{
[92]	1612	Command: "CAP",
	1613	Params: []string{"LS", "302"},
	1614	})
	1615
[93]	1616	if uc.network.Pass != "" {
	1617	uc.SendMessage(&irc.Message{
	1618	Command: "PASS",
	1619	Params: []string{uc.network.Pass},
	1620	})
	1621	}
	1622
[92]	1623	uc.SendMessage(&irc.Message{
[13]	1624	Command: "NICK",
[69]	1625	Params: []string{uc.nick},
[60]	1626	})
	1627	uc.SendMessage(&irc.Message{
[13]	1628	Command: "USER",
[77]	1629	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1630	})
[44]	1631	}
[13]	1632
[197]	1633	func (uc *upstreamConn) runUntilRegistered() error {
	1634	for !uc.registered {
[212]	1635	msg, err := uc.ReadMessage()
[197]	1636	if err != nil {
	1637	return fmt.Errorf("failed to read message: %v", err)
	1638	}
	1639
	1640	if err := uc.handleMessage(msg); err != nil {
[399]	1641	if _, ok := err.(registrationError); ok {
	1642	return err
	1643	} else {
	1644	msg.Tags = nil // prevent message tags from cluttering logs
	1645	return fmt.Errorf("failed to handle message %q: %v", msg, err)
	1646	}
[197]	1647	}
	1648	}
	1649
[263]	1650	for _, command := range uc.network.ConnectCommands {
	1651	m, err := irc.ParseMessage(command)
	1652	if err != nil {
	1653	uc.logger.Printf("failed to parse connect command %q: %v", command, err)
	1654	} else {
	1655	uc.SendMessage(m)
	1656	}
	1657	}
	1658
[197]	1659	return nil
	1660	}
	1661
[165]	1662	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1663	for {
[210]	1664	msg, err := uc.ReadMessage()
[13]	1665	if err == io.EOF {
	1666	break
	1667	} else if err != nil {
	1668	return fmt.Errorf("failed to read IRC command: %v", err)
	1669	}
	1670
[165]	1671	ch <- eventUpstreamMessage{msg, uc}
[13]	1672	}
	1673
[45]	1674	return nil
[13]	1675	}
[60]	1676
[303]	1677	func (uc upstreamConn) SendMessage(msg irc.Message) {
	1678	if !uc.caps["message-tags"] {
	1679	msg = msg.Copy()
	1680	msg.Tags = nil
	1681	}
	1682
	1683	uc.conn.SendMessage(msg)
	1684	}
	1685
[176]	1686	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[278]	1687	if uc.caps["labeled-response"] {
[155]	1688	if msg.Tags == nil {
	1689	msg.Tags = make(map[string]irc.TagValue)
	1690	}
[176]	1691	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1692	uc.nextLabelID++
[155]	1693	}
	1694	uc.SendMessage(msg)
	1695	}
[178]	1696
[428]	1697	// appendLog appends a message to the log file.
	1698	//
	1699	// The internal message ID is returned. If the message isn't recorded in the
	1700	// log file, an empty string is returned.
	1701	func (uc upstreamConn) appendLog(entity string, msg irc.Message) (msgID string) {
[423]	1702	if uc.user.msgStore == nil {
[428]	1703	return ""
[178]	1704	}
[468]	1705	if entity == "NickServ" {
	1706	// The messages sent/received from NickServ may contain
	1707	// security-related information (like passwords). Don't store these.
	1708	return ""
	1709	}
[215]	1710
[284]	1711	detached := false
	1712	if ch, ok := uc.network.channels[entity]; ok {
	1713	detached = ch.Detached
	1714	}
	1715
[451]	1716	delivered, ok := uc.network.delivered[entity]
[253]	1717	if !ok {
[423]	1718	lastID, err := uc.user.msgStore.LastMsgID(uc.network, entity, time.Now())
[409]	1719	if err != nil {
	1720	uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
[428]	1721	return ""
[409]	1722	}
	1723
[451]	1724	delivered = make(map[string]string)
	1725	uc.network.delivered[entity] = delivered
[253]	1726
	1727	for clientName, _ := range uc.network.offlineClients {
[451]	1728	delivered[clientName] = lastID
[253]	1729	}
[284]	1730
	1731	if detached {
	1732	// If the channel is detached, online clients act as offline
	1733	// clients too
	1734	uc.forEachDownstream(func(dc *downstreamConn) {
[451]	1735	delivered[dc.clientName] = lastID
[284]	1736	})
	1737	}
[253]	1738	}
	1739
[423]	1740	msgID, err := uc.user.msgStore.Append(uc.network, entity, msg)
[409]	1741	if err != nil {
	1742	uc.logger.Printf("failed to log message: %v", err)
[428]	1743	return ""
[409]	1744	}
[406]	1745
[428]	1746	return msgID
[253]	1747	}
	1748
[409]	1749	// produce appends a message to the logs and forwards it to connected downstream
	1750	// connections.
[245]	1751	//
	1752	// If origin is not nil and origin doesn't support echo-message, the message is
	1753	// forwarded to all connections except origin.
[239]	1754	func (uc upstreamConn) produce(target string, msg irc.Message, origin *downstreamConn) {
[428]	1755	var msgID string
[239]	1756	if target != "" {
[428]	1757	msgID = uc.appendLog(target, msg)
[239]	1758	}
	1759
[284]	1760	// Don't forward messages if it's a detached channel
	1761	if ch, ok := uc.network.channels[target]; ok && ch.Detached {
	1762	return
	1763	}
	1764
[227]	1765	uc.forEachDownstream(func(dc *downstreamConn) {
[238]	1766	if dc != origin \|\| dc.caps["echo-message"] {
[428]	1767	dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
	1768	} else {
	1769	dc.advanceMessageWithID(msg, msgID)
[238]	1770	}
[227]	1771	})
[226]	1772	}
	1773
[198]	1774	func (uc *upstreamConn) updateAway() {
	1775	away := true
	1776	uc.forEachDownstream(func(*downstreamConn) {
	1777	away = false
	1778	})
	1779	if away == uc.away {
	1780	return
	1781	}
	1782	if away {
	1783	uc.SendMessage(&irc.Message{
	1784	Command: "AWAY",
	1785	Params: []string{"Auto away"},
	1786	})
	1787	} else {
	1788	uc.SendMessage(&irc.Message{
	1789	Command: "AWAY",
	1790	})
	1791	}
	1792	uc.away = away
	1793	}
[435]	1794
	1795	func (uc *upstreamConn) updateChannelAutoDetach(name string) {
	1796	if uch, ok := uc.channels[name]; ok {
	1797	if ch, ok := uc.network.channels[name]; ok && !ch.Detached {
	1798	uch.updateAutoDetach(ch.DetachAfter)
	1799	}
	1800	}
	1801	}

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