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source: code/trunk/upstream.go@ 308

Last change on this file since 308 was 307, checked in by fox.cpp, 5 years ago

Implement upstream SASL EXTERNAL support

Closes: https://todo.sr.ht/~emersion/soju/47

File size: 40.8 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,
	28	"labeled-response": true,
	29	"message-tags": true,
[292]	30	"multi-prefix": true,
[282]	31	"server-time": true,
	32	}
	33
[19]	34	type upstreamChannel struct {
[162]	35	Name string
	36	conn *upstreamConn
	37	Topic string
	38	TopicWho string
	39	TopicTime time.Time
	40	Status channelStatus
	41	modes channelModes
	42	creationTime string
[292]	43	Members map[string]*memberships
[162]	44	complete bool
[19]	45	}
	46
[13]	47	type upstreamConn struct {
[210]	48	conn
[16]	49
[210]	50	network *network
	51	user *user
	52
[16]	53	serverName string
	54	availableUserModes string
[139]	55	availableChannelModes map[byte]channelModeType
	56	availableChannelTypes string
	57	availableMemberships []membership
[19]	58
[277]	59	registered bool
	60	nick string
	61	username string
	62	realname string
	63	modes userModes
	64	channels map[string]*upstreamChannel
	65	supportedCaps map[string]string
[278]	66	caps map[string]bool
[277]	67	batches map[string]batch
	68	away bool
[278]	69	nextLabelID uint64
[95]	70
	71	saslClient sasl.Client
	72	saslStarted bool
[177]	73
	74	// set of LIST commands in progress, per downstream
	75	pendingLISTDownstreamSet map[uint64]struct{}
[178]	76
[215]	77	messageLoggers map[string]*messageLogger
[13]	78	}
	79
[77]	80	func connectToUpstream(network network) (upstreamConn, error) {
	81	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	82
[269]	83	var scheme string
	84	var addr string
	85
	86	addrParts := strings.SplitN(network.Addr, "://", 2)
	87	if len(addrParts) == 2 {
	88	scheme = addrParts[0]
	89	addr = addrParts[1]
	90	} else {
	91	scheme = "ircs"
	92	addr = addrParts[0]
[77]	93	}
	94
[206]	95	dialer := net.Dialer{Timeout: connectTimeout}
	96
[269]	97	var netConn net.Conn
	98	var err error
	99	switch scheme {
	100	case "ircs":
	101	if !strings.ContainsRune(addr, ':') {
	102	addr = addr + ":6697"
	103	}
	104
	105	logger.Printf("connecting to TLS server at address %q", addr)
[307]	106
	107	var cfg *tls.Config
	108	if network.SASL.Mechanism == "EXTERNAL" {
	109	if network.SASL.External.CertBlob == nil {
	110	return nil, fmt.Errorf("missing certificate for authentication")
	111	}
	112	if network.SASL.External.PrivKeyBlob == nil {
	113	return nil, fmt.Errorf("missing private key for authentication")
	114	}
	115	key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
	116	if err != nil {
	117	return nil, fmt.Errorf("failed to parse private key: %v", err)
	118	}
	119	cfg = &tls.Config{
	120	Certificates: []tls.Certificate{
	121	{
	122	Certificate: [][]byte{network.SASL.External.CertBlob},
	123	PrivateKey: key.(crypto.PrivateKey),
	124	},
	125	},
	126	}
	127	logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
	128	}
	129
	130	netConn, err = tls.DialWithDialer(&dialer, "tcp", addr, cfg)
[270]	131	case "irc+insecure":
	132	if !strings.ContainsRune(addr, ':') {
	133	addr = addr + ":6667"
	134	}
	135
	136	logger.Printf("connecting to plain-text server at address %q", addr)
	137	netConn, err = dialer.Dial("tcp", addr)
[269]	138	default:
	139	return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", addr, scheme)
	140	}
[33]	141	if err != nil {
[77]	142	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
[33]	143	}
	144
[55]	145	uc := &upstreamConn{
[210]	146	conn: *newConn(network.user.srv, netConn, logger),
[177]	147	network: network,
	148	user: network.user,
	149	channels: make(map[string]*upstreamChannel),
[277]	150	supportedCaps: make(map[string]string),
[278]	151	caps: make(map[string]bool),
[177]	152	batches: make(map[string]batch),
	153	availableChannelTypes: stdChannelTypes,
	154	availableChannelModes: stdChannelModes,
	155	availableMemberships: stdMemberships,
	156	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[215]	157	messageLoggers: make(map[string]*messageLogger),
[33]	158	}
	159
[55]	160	return uc, nil
[33]	161	}
	162
[73]	163	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
[218]	164	uc.network.forEachDownstream(f)
[73]	165	}
	166
[161]	167	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	168	uc.forEachDownstream(func(dc *downstreamConn) {
	169	if id != 0 && id != dc.id {
	170	return
	171	}
	172	f(dc)
	173	})
	174	}
	175
[55]	176	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	177	ch, ok := uc.channels[name]
[19]	178	if !ok {
	179	return nil, fmt.Errorf("unknown channel %q", name)
	180	}
	181	return ch, nil
	182	}
	183
[129]	184	func (uc *upstreamConn) isChannel(entity string) bool {
[139]	185	if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
	186	return true
[129]	187	}
	188	return false
	189	}
	190
[181]	191	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	192	for _, pl := range uc.user.pendingLISTs {
	193	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	194	continue
	195	}
	196	return &pl
	197	}
	198	return nil
	199	}
	200
[181]	201	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	202	found = false
	203	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	204	pl := uc.user.pendingLISTs[i]
	205	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	206	continue
	207	}
	208	delete(pl.pendingCommands, uc.network.ID)
	209	if len(pl.pendingCommands) == 0 {
	210	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	211	i--
	212	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	213	dc.SendMessage(&irc.Message{
	214	Prefix: dc.srv.prefix(),
	215	Command: irc.RPL_LISTEND,
	216	Params: []string{dc.nick, "End of /LIST"},
	217	})
	218	})
	219	}
	220	found = true
	221	if !all {
	222	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	223	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	224	uc.trySendLIST(pl.downstreamID)
[177]	225	})
	226	return
	227	}
	228	}
	229	return
	230	}
	231
[181]	232	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	233	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	234	// a LIST command is already pending
	235	// we will try again when that command is completed
	236	return
	237	}
	238
	239	for _, pl := range uc.user.pendingLISTs {
	240	if pl.downstreamID != downstreamID {
	241	continue
	242	}
	243	// this is the first pending LIST command list of the downstream
	244	listCommand, ok := pl.pendingCommands[uc.network.ID]
	245	if !ok {
	246	// there is no command for this upstream in these LIST commands
	247	// do not send anything
	248	continue
	249	}
	250	// there is a command for this upstream in these LIST commands
	251	// send it now
	252
	253	uc.SendMessageLabeled(downstreamID, listCommand)
	254
	255	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	256	return
	257	}
	258	}
	259
[292]	260	func (uc upstreamConn) parseMembershipPrefix(s string) (ms memberships, nick string) {
	261	memberships := make(memberships, 0, 4)
	262	i := 0
[139]	263	for _, m := range uc.availableMemberships {
[292]	264	if i >= len(s) {
	265	break
[139]	266	}
[292]	267	if s[i] == m.Prefix {
	268	memberships = append(memberships, m)
	269	i++
	270	}
[139]	271	}
[292]	272	return &memberships, s[i:]
[139]	273	}
	274
[288]	275	func isWordBoundary(r rune) bool {
	276	switch r {
	277	case '-', '_', '\|':
	278	return false
	279	case '\u00A0':
	280	return true
	281	default:
	282	return !unicode.IsLetter(r) && !unicode.IsNumber(r)
	283	}
	284	}
	285
	286	func isHighlight(text, nick string) bool {
	287	for {
	288	i := strings.Index(text, nick)
	289	if i < 0 {
	290	return false
	291	}
	292
	293	// Detect word boundaries
	294	var left, right rune
	295	if i > 0 {
	296	left, _ = utf8.DecodeLastRuneInString(text[:i])
	297	}
	298	if i < len(text) {
	299	right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
	300	}
	301	if isWordBoundary(left) && isWordBoundary(right) {
	302	return true
	303	}
	304
	305	text = text[i+len(nick):]
	306	}
	307	}
	308
[55]	309	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	310	var label string
	311	if l, ok := msg.GetTag("label"); ok {
	312	label = l
	313	}
	314
[153]	315	var msgBatch *batch
	316	if batchName, ok := msg.GetTag("batch"); ok {
	317	b, ok := uc.batches[batchName]
	318	if !ok {
	319	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	320	}
	321	msgBatch = &b
[155]	322	if label == "" {
	323	label = msgBatch.Label
	324	}
[153]	325	}
	326
[161]	327	var downstreamID uint64 = 0
[155]	328	if label != "" {
	329	var labelOffset uint64
[161]	330	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	331	if err == nil && n < 2 {
	332	err = errors.New("not enough arguments")
	333	}
	334	if err != nil {
	335	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	336	}
	337	}
	338
[216]	339	if _, ok := msg.Tags["time"]; !ok {
[240]	340	msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[216]	341	}
	342
[13]	343	switch msg.Command {
	344	case "PING":
[60]	345	uc.SendMessage(&irc.Message{
[13]	346	Command: "PONG",
[68]	347	Params: msg.Params,
[60]	348	})
[33]	349	return nil
[303]	350	case "NOTICE", "PRIVMSG", "TAGMSG":
[273]	351	if msg.Prefix == nil {
	352	return fmt.Errorf("expected a prefix")
	353	}
	354
[286]	355	var entity, text string
[303]	356	if msg.Command != "TAGMSG" {
	357	if err := parseMessageParams(msg, &entity, &text); err != nil {
	358	return err
	359	}
	360	} else {
	361	if err := parseMessageParams(msg, &entity); err != nil {
	362	return err
	363	}
[286]	364	}
	365
	366	if msg.Prefix.Name == serviceNick {
	367	uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
	368	break
	369	}
	370	if entity == serviceNick {
	371	uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
	372	break
	373	}
	374
[171]	375	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
[239]	376	uc.produce("", msg, nil)
[303]	377	} else { // regular user message
[217]	378	target := entity
	379	if target == uc.nick {
[178]	380	target = msg.Prefix.Name
	381	}
[239]	382	uc.produce(target, msg, nil)
[287]	383
[288]	384	highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
[287]	385	if ch, ok := uc.network.channels[target]; ok && ch.Detached && highlight {
	386	uc.forEachDownstream(func(dc *downstreamConn) {
	387	sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), msg.Prefix.Name, text))
	388	})
	389	}
[171]	390	}
[92]	391	case "CAP":
[95]	392	var subCmd string
	393	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	394	return err
[92]	395	}
[95]	396	subCmd = strings.ToUpper(subCmd)
	397	subParams := msg.Params[2:]
	398	switch subCmd {
	399	case "LS":
	400	if len(subParams) < 1 {
	401	return newNeedMoreParamsError(msg.Command)
	402	}
[281]	403	caps := subParams[len(subParams)-1]
[95]	404	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	405
[281]	406	uc.handleSupportedCaps(caps)
[92]	407
[95]	408	if more {
	409	break // wait to receive all capabilities
	410	}
	411
[281]	412	uc.requestCaps()
[152]	413
[95]	414	if uc.requestSASL() {
	415	break // we'll send CAP END after authentication is completed
	416	}
	417
[92]	418	uc.SendMessage(&irc.Message{
	419	Command: "CAP",
	420	Params: []string{"END"},
	421	})
[95]	422	case "ACK", "NAK":
	423	if len(subParams) < 1 {
	424	return newNeedMoreParamsError(msg.Command)
	425	}
	426	caps := strings.Fields(subParams[0])
	427
	428	for _, name := range caps {
	429	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	430	return err
	431	}
	432	}
	433
[281]	434	if uc.registered {
	435	uc.forEachDownstream(func(dc *downstreamConn) {
	436	dc.updateSupportedCaps()
	437	})
	438	}
	439	case "NEW":
	440	if len(subParams) < 1 {
	441	return newNeedMoreParamsError(msg.Command)
	442	}
	443	uc.handleSupportedCaps(subParams[0])
	444	uc.requestCaps()
	445	case "DEL":
	446	if len(subParams) < 1 {
	447	return newNeedMoreParamsError(msg.Command)
	448	}
	449	caps := strings.Fields(subParams[0])
	450
	451	for _, c := range caps {
	452	delete(uc.supportedCaps, c)
	453	delete(uc.caps, c)
	454	}
	455
	456	if uc.registered {
	457	uc.forEachDownstream(func(dc *downstreamConn) {
	458	dc.updateSupportedCaps()
	459	})
	460	}
[95]	461	default:
	462	uc.logger.Printf("unhandled message: %v", msg)
[92]	463	}
[95]	464	case "AUTHENTICATE":
	465	if uc.saslClient == nil {
	466	return fmt.Errorf("received unexpected AUTHENTICATE message")
	467	}
	468
	469	// TODO: if a challenge is 400 bytes long, buffer it
	470	var challengeStr string
	471	if err := parseMessageParams(msg, &challengeStr); err != nil {
	472	uc.SendMessage(&irc.Message{
	473	Command: "AUTHENTICATE",
	474	Params: []string{"*"},
	475	})
	476	return err
	477	}
	478
	479	var challenge []byte
	480	if challengeStr != "+" {
	481	var err error
	482	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	483	if err != nil {
	484	uc.SendMessage(&irc.Message{
	485	Command: "AUTHENTICATE",
	486	Params: []string{"*"},
	487	})
	488	return err
	489	}
	490	}
	491
	492	var resp []byte
	493	var err error
	494	if !uc.saslStarted {
	495	_, resp, err = uc.saslClient.Start()
	496	uc.saslStarted = true
	497	} else {
	498	resp, err = uc.saslClient.Next(challenge)
	499	}
	500	if err != nil {
	501	uc.SendMessage(&irc.Message{
	502	Command: "AUTHENTICATE",
	503	Params: []string{"*"},
	504	})
	505	return err
	506	}
	507
	508	// TODO: send response in multiple chunks if >= 400 bytes
	509	var respStr = "+"
	510	if resp != nil {
	511	respStr = base64.StdEncoding.EncodeToString(resp)
	512	}
	513
	514	uc.SendMessage(&irc.Message{
	515	Command: "AUTHENTICATE",
	516	Params: []string{respStr},
	517	})
[125]	518	case irc.RPL_LOGGEDIN:
[95]	519	var account string
	520	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	521	return err
	522	}
	523	uc.logger.Printf("logged in with account %q", account)
[125]	524	case irc.RPL_LOGGEDOUT:
[95]	525	uc.logger.Printf("logged out")
[125]	526	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	527	var info string
	528	if err := parseMessageParams(msg, nil, &info); err != nil {
	529	return err
	530	}
	531	switch msg.Command {
[125]	532	case irc.ERR_NICKLOCKED:
[95]	533	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	534	case irc.ERR_SASLFAIL:
[95]	535	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	536	case irc.ERR_SASLTOOLONG:
[95]	537	uc.logger.Printf("SASL message too long: %v", info)
	538	}
	539
	540	uc.saslClient = nil
	541	uc.saslStarted = false
	542
	543	uc.SendMessage(&irc.Message{
	544	Command: "CAP",
	545	Params: []string{"END"},
	546	})
[14]	547	case irc.RPL_WELCOME:
[55]	548	uc.registered = true
	549	uc.logger.Printf("connection registered")
[19]	550
[276]	551	uc.forEachDownstream(func(dc *downstreamConn) {
	552	dc.updateSupportedCaps()
	553	})
	554
[305]	555	// TODO: split this into multiple messages if need be
	556	var names, keys []string
[267]	557	for _, ch := range uc.network.channels {
[305]	558	names = append(names, ch.Name)
	559	keys = append(keys, ch.Key)
[19]	560	}
[305]	561	uc.SendMessage(&irc.Message{
	562	Command: "JOIN",
	563	Params: []string{
	564	strings.Join(names, ","),
	565	strings.Join(keys, ","),
	566	},
	567	})
[16]	568	case irc.RPL_MYINFO:
[139]	569	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	570	return err
[16]	571	}
[139]	572	case irc.RPL_ISUPPORT:
	573	if err := parseMessageParams(msg, nil, nil); err != nil {
	574	return err
[16]	575	}
[139]	576	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	577	negate := false
	578	parameter := token
	579	value := ""
	580	if strings.HasPrefix(token, "-") {
	581	negate = true
	582	token = token[1:]
	583	} else {
	584	if i := strings.IndexByte(token, '='); i >= 0 {
	585	parameter = token[:i]
	586	value = token[i+1:]
	587	}
	588	}
	589	if !negate {
	590	switch parameter {
	591	case "CHANMODES":
	592	parts := strings.SplitN(value, ",", 5)
	593	if len(parts) < 4 {
	594	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
	595	}
	596	modes := make(map[byte]channelModeType)
	597	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	598	for j := 0; j < len(parts[i]); j++ {
	599	mode := parts[i][j]
	600	modes[mode] = mt
	601	}
	602	}
	603	uc.availableChannelModes = modes
	604	case "CHANTYPES":
	605	uc.availableChannelTypes = value
	606	case "PREFIX":
	607	if value == "" {
	608	uc.availableMemberships = nil
	609	} else {
	610	if value[0] != '(' {
	611	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	612	}
	613	sep := strings.IndexByte(value, ')')
	614	if sep < 0 \|\| len(value) != sep*2 {
	615	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	616	}
	617	memberships := make([]membership, len(value)/2-1)
	618	for i := range memberships {
	619	memberships[i] = membership{
	620	Mode: value[i+1],
	621	Prefix: value[sep+i+1],
	622	}
	623	}
	624	uc.availableMemberships = memberships
	625	}
	626	}
	627	} else {
	628	// TODO: handle ISUPPORT negations
	629	}
	630	}
[153]	631	case "BATCH":
	632	var tag string
	633	if err := parseMessageParams(msg, &tag); err != nil {
	634	return err
	635	}
	636
	637	if strings.HasPrefix(tag, "+") {
	638	tag = tag[1:]
	639	if _, ok := uc.batches[tag]; ok {
	640	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	641	}
	642	var batchType string
	643	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	644	return err
	645	}
[155]	646	label := label
	647	if label == "" && msgBatch != nil {
	648	label = msgBatch.Label
	649	}
[153]	650	uc.batches[tag] = batch{
	651	Type: batchType,
	652	Params: msg.Params[2:],
	653	Outer: msgBatch,
[155]	654	Label: label,
[153]	655	}
	656	} else if strings.HasPrefix(tag, "-") {
	657	tag = tag[1:]
	658	if _, ok := uc.batches[tag]; !ok {
	659	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	660	}
	661	delete(uc.batches, tag)
	662	} else {
	663	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	664	}
[42]	665	case "NICK":
[83]	666	if msg.Prefix == nil {
	667	return fmt.Errorf("expected a prefix")
	668	}
	669
[43]	670	var newNick string
	671	if err := parseMessageParams(msg, &newNick); err != nil {
	672	return err
[42]	673	}
	674
[244]	675	me := false
[55]	676	if msg.Prefix.Name == uc.nick {
	677	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
[244]	678	me = true
[55]	679	uc.nick = newNick
[42]	680	}
	681
[55]	682	for _, ch := range uc.channels {
[292]	683	if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
[42]	684	delete(ch.Members, msg.Prefix.Name)
[292]	685	ch.Members[newNick] = memberships
[215]	686	uc.appendLog(ch.Name, msg)
[253]	687	uc.appendHistory(ch.Name, msg)
[42]	688	}
	689	}
[82]	690
[244]	691	if !me {
[82]	692	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	693	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[82]	694	})
[296]	695	} else {
	696	uc.forEachDownstream(func(dc *downstreamConn) {
	697	dc.updateNick()
	698	})
[82]	699	}
[69]	700	case "JOIN":
	701	if msg.Prefix == nil {
	702	return fmt.Errorf("expected a prefix")
	703	}
[42]	704
[43]	705	var channels string
	706	if err := parseMessageParams(msg, &channels); err != nil {
	707	return err
[19]	708	}
[34]	709
[43]	710	for _, ch := range strings.Split(channels, ",") {
[55]	711	if msg.Prefix.Name == uc.nick {
	712	uc.logger.Printf("joined channel %q", ch)
	713	uc.channels[ch] = &upstreamChannel{
[34]	714	Name: ch,
[55]	715	conn: uc,
[292]	716	Members: make(map[string]*memberships),
[34]	717	}
[139]	718
	719	uc.SendMessage(&irc.Message{
	720	Command: "MODE",
	721	Params: []string{ch},
	722	})
[34]	723	} else {
[55]	724	ch, err := uc.getChannel(ch)
[34]	725	if err != nil {
	726	return err
	727	}
[294]	728	ch.Members[msg.Prefix.Name] = &memberships{}
[19]	729	}
[69]	730
[245]	731	chMsg := msg.Copy()
	732	chMsg.Params[0] = ch
	733	uc.produce(ch, chMsg, nil)
[19]	734	}
[69]	735	case "PART":
	736	if msg.Prefix == nil {
	737	return fmt.Errorf("expected a prefix")
	738	}
[34]	739
[43]	740	var channels string
	741	if err := parseMessageParams(msg, &channels); err != nil {
	742	return err
[34]	743	}
	744
[43]	745	for _, ch := range strings.Split(channels, ",") {
[55]	746	if msg.Prefix.Name == uc.nick {
	747	uc.logger.Printf("parted channel %q", ch)
	748	delete(uc.channels, ch)
[34]	749	} else {
[55]	750	ch, err := uc.getChannel(ch)
[34]	751	if err != nil {
	752	return err
	753	}
	754	delete(ch.Members, msg.Prefix.Name)
	755	}
[69]	756
[245]	757	chMsg := msg.Copy()
	758	chMsg.Params[0] = ch
	759	uc.produce(ch, chMsg, nil)
[34]	760	}
[159]	761	case "KICK":
	762	if msg.Prefix == nil {
	763	return fmt.Errorf("expected a prefix")
	764	}
	765
	766	var channel, user string
	767	if err := parseMessageParams(msg, &channel, &user); err != nil {
	768	return err
	769	}
	770
	771	if user == uc.nick {
	772	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	773	delete(uc.channels, channel)
	774	} else {
	775	ch, err := uc.getChannel(channel)
	776	if err != nil {
	777	return err
	778	}
	779	delete(ch.Members, user)
	780	}
	781
[245]	782	uc.produce(channel, msg, nil)
[83]	783	case "QUIT":
	784	if msg.Prefix == nil {
	785	return fmt.Errorf("expected a prefix")
	786	}
	787
	788	if msg.Prefix.Name == uc.nick {
	789	uc.logger.Printf("quit")
	790	}
	791
	792	for _, ch := range uc.channels {
[178]	793	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	794	delete(ch.Members, msg.Prefix.Name)
	795
[215]	796	uc.appendLog(ch.Name, msg)
[253]	797	uc.appendHistory(ch.Name, msg)
[178]	798	}
[83]	799	}
	800
	801	if msg.Prefix.Name != uc.nick {
	802	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	803	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[83]	804	})
	805	}
[19]	806	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	807	var name, topic string
	808	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	809	return err
[19]	810	}
[55]	811	ch, err := uc.getChannel(name)
[19]	812	if err != nil {
	813	return err
	814	}
	815	if msg.Command == irc.RPL_TOPIC {
[43]	816	ch.Topic = topic
[19]	817	} else {
	818	ch.Topic = ""
	819	}
	820	case "TOPIC":
[43]	821	var name string
[74]	822	if err := parseMessageParams(msg, &name); err != nil {
[43]	823	return err
[19]	824	}
[55]	825	ch, err := uc.getChannel(name)
[19]	826	if err != nil {
	827	return err
	828	}
	829	if len(msg.Params) > 1 {
	830	ch.Topic = msg.Params[1]
	831	} else {
	832	ch.Topic = ""
	833	}
[245]	834	uc.produce(ch.Name, msg, nil)
[139]	835	case "MODE":
	836	var name, modeStr string
	837	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	838	return err
	839	}
	840
	841	if !uc.isChannel(name) { // user mode change
	842	if name != uc.nick {
	843	return fmt.Errorf("received MODE message for unknown nick %q", name)
	844	}
	845	return uc.modes.Apply(modeStr)
	846	// TODO: notify downstreams about user mode change?
	847	} else { // channel mode change
	848	ch, err := uc.getChannel(name)
	849	if err != nil {
	850	return err
	851	}
	852
[293]	853	needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
	854	if err != nil {
	855	return err
[139]	856	}
	857
[293]	858	uc.appendLog(ch.Name, msg)
	859	uc.forEachDownstream(func(dc *downstreamConn) {
	860	params := make([]string, len(msg.Params))
	861	params[0] = dc.marshalEntity(uc.network, name)
	862	params[1] = modeStr
	863
	864	copy(params[2:], msg.Params[2:])
	865	for i, modeParam := range params[2:] {
	866	if _, ok := needMarshaling[i]; ok {
	867	params[2+i] = dc.marshalEntity(uc.network, modeParam)
	868	}
	869	}
	870
	871	dc.SendMessage(&irc.Message{
	872	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	873	Command: "MODE",
	874	Params: params,
	875	})
	876	})
[139]	877	}
	878	case irc.RPL_UMODEIS:
	879	if err := parseMessageParams(msg, nil); err != nil {
	880	return err
	881	}
	882	modeStr := ""
	883	if len(msg.Params) > 1 {
	884	modeStr = msg.Params[1]
	885	}
	886
	887	uc.modes = ""
	888	if err := uc.modes.Apply(modeStr); err != nil {
	889	return err
	890	}
	891	// TODO: send RPL_UMODEIS to downstream connections when applicable
	892	case irc.RPL_CHANNELMODEIS:
	893	var channel string
	894	if err := parseMessageParams(msg, nil, &channel); err != nil {
	895	return err
	896	}
	897	modeStr := ""
	898	if len(msg.Params) > 2 {
	899	modeStr = msg.Params[2]
	900	}
	901
	902	ch, err := uc.getChannel(channel)
	903	if err != nil {
	904	return err
	905	}
	906
	907	firstMode := ch.modes == nil
	908	ch.modes = make(map[byte]string)
[293]	909	if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
[139]	910	return err
	911	}
	912	if firstMode {
	913	modeStr, modeParams := ch.modes.Format()
	914
	915	uc.forEachDownstream(func(dc *downstreamConn) {
[260]	916	params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
[139]	917	params = append(params, modeParams...)
	918
	919	dc.SendMessage(&irc.Message{
	920	Prefix: dc.srv.prefix(),
	921	Command: irc.RPL_CHANNELMODEIS,
	922	Params: params,
	923	})
	924	})
	925	}
[162]	926	case rpl_creationtime:
	927	var channel, creationTime string
	928	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	929	return err
	930	}
	931
	932	ch, err := uc.getChannel(channel)
	933	if err != nil {
	934	return err
	935	}
	936
	937	firstCreationTime := ch.creationTime == ""
	938	ch.creationTime = creationTime
	939	if firstCreationTime {
	940	uc.forEachDownstream(func(dc *downstreamConn) {
	941	dc.SendMessage(&irc.Message{
	942	Prefix: dc.srv.prefix(),
	943	Command: rpl_creationtime,
	944	Params: []string{dc.nick, channel, creationTime},
	945	})
	946	})
	947	}
[19]	948	case rpl_topicwhotime:
[43]	949	var name, who, timeStr string
	950	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	951	return err
[19]	952	}
[55]	953	ch, err := uc.getChannel(name)
[19]	954	if err != nil {
	955	return err
	956	}
[43]	957	ch.TopicWho = who
	958	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	959	if err != nil {
	960	return fmt.Errorf("failed to parse topic time: %v", err)
	961	}
	962	ch.TopicTime = time.Unix(sec, 0)
[177]	963	case irc.RPL_LIST:
	964	var channel, clients, topic string
	965	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	966	return err
	967	}
	968
[181]	969	pl := uc.getPendingLIST()
[177]	970	if pl == nil {
	971	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	972	}
	973
	974	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	975	dc.SendMessage(&irc.Message{
	976	Prefix: dc.srv.prefix(),
	977	Command: irc.RPL_LIST,
[260]	978	Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
[177]	979	})
	980	})
	981	case irc.RPL_LISTEND:
[181]	982	ok := uc.endPendingLISTs(false)
[177]	983	if !ok {
	984	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	985	}
[19]	986	case irc.RPL_NAMREPLY:
[43]	987	var name, statusStr, members string
	988	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	989	return err
[19]	990	}
[140]	991
	992	ch, ok := uc.channels[name]
	993	if !ok {
	994	// NAMES on a channel we have not joined, forward to downstream
[161]	995	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	996	channel := dc.marshalEntity(uc.network, name)
[174]	997	members := splitSpace(members)
[140]	998	for i, member := range members {
[292]	999	memberships, nick := uc.parseMembershipPrefix(member)
	1000	members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
[140]	1001	}
	1002	memberStr := strings.Join(members, " ")
	1003
	1004	dc.SendMessage(&irc.Message{
	1005	Prefix: dc.srv.prefix(),
	1006	Command: irc.RPL_NAMREPLY,
	1007	Params: []string{dc.nick, statusStr, channel, memberStr},
	1008	})
	1009	})
	1010	return nil
[19]	1011	}
	1012
[43]	1013	status, err := parseChannelStatus(statusStr)
[19]	1014	if err != nil {
	1015	return err
	1016	}
	1017	ch.Status = status
	1018
[174]	1019	for _, s := range splitSpace(members) {
[292]	1020	memberships, nick := uc.parseMembershipPrefix(s)
	1021	ch.Members[nick] = memberships
[19]	1022	}
	1023	case irc.RPL_ENDOFNAMES:
[43]	1024	var name string
	1025	if err := parseMessageParams(msg, nil, &name); err != nil {
	1026	return err
[25]	1027	}
[140]	1028
	1029	ch, ok := uc.channels[name]
	1030	if !ok {
	1031	// NAMES on a channel we have not joined, forward to downstream
[161]	1032	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1033	channel := dc.marshalEntity(uc.network, name)
[140]	1034
	1035	dc.SendMessage(&irc.Message{
	1036	Prefix: dc.srv.prefix(),
	1037	Command: irc.RPL_ENDOFNAMES,
	1038	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1039	})
	1040	})
	1041	return nil
[25]	1042	}
	1043
[34]	1044	if ch.complete {
	1045	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1046	}
[25]	1047	ch.complete = true
[27]	1048
[73]	1049	uc.forEachDownstream(func(dc *downstreamConn) {
[27]	1050	forwardChannel(dc, ch)
[40]	1051	})
[127]	1052	case irc.RPL_WHOREPLY:
	1053	var channel, username, host, server, nick, mode, trailing string
	1054	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1055	return err
	1056	}
	1057
	1058	parts := strings.SplitN(trailing, " ", 2)
	1059	if len(parts) != 2 {
	1060	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1061	}
	1062	realname := parts[1]
	1063	hops, err := strconv.Atoi(parts[0])
	1064	if err != nil {
	1065	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1066	}
	1067	hops++
	1068
	1069	trailing = strconv.Itoa(hops) + " " + realname
	1070
[161]	1071	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1072	channel := channel
	1073	if channel != "*" {
[260]	1074	channel = dc.marshalEntity(uc.network, channel)
[127]	1075	}
[260]	1076	nick := dc.marshalEntity(uc.network, nick)
[127]	1077	dc.SendMessage(&irc.Message{
	1078	Prefix: dc.srv.prefix(),
	1079	Command: irc.RPL_WHOREPLY,
	1080	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1081	})
	1082	})
	1083	case irc.RPL_ENDOFWHO:
	1084	var name string
	1085	if err := parseMessageParams(msg, nil, &name); err != nil {
	1086	return err
	1087	}
	1088
[161]	1089	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1090	name := name
	1091	if name != "*" {
	1092	// TODO: support WHO masks
[260]	1093	name = dc.marshalEntity(uc.network, name)
[127]	1094	}
	1095	dc.SendMessage(&irc.Message{
	1096	Prefix: dc.srv.prefix(),
	1097	Command: irc.RPL_ENDOFWHO,
[142]	1098	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1099	})
	1100	})
[128]	1101	case irc.RPL_WHOISUSER:
	1102	var nick, username, host, realname string
	1103	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1104	return err
	1105	}
	1106
[161]	1107	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1108	nick := dc.marshalEntity(uc.network, nick)
[128]	1109	dc.SendMessage(&irc.Message{
	1110	Prefix: dc.srv.prefix(),
	1111	Command: irc.RPL_WHOISUSER,
	1112	Params: []string{dc.nick, nick, username, host, "*", realname},
	1113	})
	1114	})
	1115	case irc.RPL_WHOISSERVER:
	1116	var nick, server, serverInfo string
	1117	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1118	return err
	1119	}
	1120
[161]	1121	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1122	nick := dc.marshalEntity(uc.network, nick)
[128]	1123	dc.SendMessage(&irc.Message{
	1124	Prefix: dc.srv.prefix(),
	1125	Command: irc.RPL_WHOISSERVER,
	1126	Params: []string{dc.nick, nick, server, serverInfo},
	1127	})
	1128	})
	1129	case irc.RPL_WHOISOPERATOR:
	1130	var nick string
	1131	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1132	return err
	1133	}
	1134
[161]	1135	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1136	nick := dc.marshalEntity(uc.network, nick)
[128]	1137	dc.SendMessage(&irc.Message{
	1138	Prefix: dc.srv.prefix(),
	1139	Command: irc.RPL_WHOISOPERATOR,
	1140	Params: []string{dc.nick, nick, "is an IRC operator"},
	1141	})
	1142	})
	1143	case irc.RPL_WHOISIDLE:
	1144	var nick string
	1145	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1146	return err
	1147	}
	1148
[161]	1149	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1150	nick := dc.marshalEntity(uc.network, nick)
[128]	1151	params := []string{dc.nick, nick}
	1152	params = append(params, msg.Params[2:]...)
	1153	dc.SendMessage(&irc.Message{
	1154	Prefix: dc.srv.prefix(),
	1155	Command: irc.RPL_WHOISIDLE,
	1156	Params: params,
	1157	})
	1158	})
	1159	case irc.RPL_WHOISCHANNELS:
	1160	var nick, channelList string
	1161	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1162	return err
	1163	}
[174]	1164	channels := splitSpace(channelList)
[128]	1165
[161]	1166	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1167	nick := dc.marshalEntity(uc.network, nick)
[128]	1168	channelList := make([]string, len(channels))
	1169	for i, channel := range channels {
[139]	1170	prefix, channel := uc.parseMembershipPrefix(channel)
[260]	1171	channel = dc.marshalEntity(uc.network, channel)
[292]	1172	channelList[i] = prefix.Format(dc) + channel
[128]	1173	}
	1174	channels := strings.Join(channelList, " ")
	1175	dc.SendMessage(&irc.Message{
	1176	Prefix: dc.srv.prefix(),
	1177	Command: irc.RPL_WHOISCHANNELS,
	1178	Params: []string{dc.nick, nick, channels},
	1179	})
	1180	})
	1181	case irc.RPL_ENDOFWHOIS:
	1182	var nick string
	1183	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1184	return err
	1185	}
	1186
[161]	1187	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1188	nick := dc.marshalEntity(uc.network, nick)
[128]	1189	dc.SendMessage(&irc.Message{
	1190	Prefix: dc.srv.prefix(),
	1191	Command: irc.RPL_ENDOFWHOIS,
[142]	1192	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1193	})
	1194	})
[115]	1195	case "INVITE":
[273]	1196	var nick, channel string
[115]	1197	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1198	return err
	1199	}
	1200
	1201	uc.forEachDownstream(func(dc *downstreamConn) {
	1202	dc.SendMessage(&irc.Message{
[260]	1203	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
[115]	1204	Command: "INVITE",
[260]	1205	Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[115]	1206	})
	1207	})
[163]	1208	case irc.RPL_INVITING:
[273]	1209	var nick, channel string
[304]	1210	if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
[163]	1211	return err
	1212	}
	1213
	1214	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1215	dc.SendMessage(&irc.Message{
	1216	Prefix: dc.srv.prefix(),
	1217	Command: irc.RPL_INVITING,
[260]	1218	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[163]	1219	})
	1220	})
[272]	1221	case irc.RPL_AWAY:
	1222	var nick, reason string
	1223	if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
	1224	return err
	1225	}
	1226
[274]	1227	uc.forEachDownstream(func(dc *downstreamConn) {
[272]	1228	dc.SendMessage(&irc.Message{
	1229	Prefix: dc.srv.prefix(),
	1230	Command: irc.RPL_AWAY,
	1231	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
	1232	})
	1233	})
[276]	1234	case "AWAY":
	1235	if msg.Prefix == nil {
	1236	return fmt.Errorf("expected a prefix")
	1237	}
	1238
	1239	uc.forEachDownstream(func(dc *downstreamConn) {
	1240	if !dc.caps["away-notify"] {
	1241	return
	1242	}
	1243	dc.SendMessage(&irc.Message{
	1244	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	1245	Command: "AWAY",
	1246	Params: msg.Params,
	1247	})
	1248	})
[300]	1249	case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
	1250	var channel, mask string
	1251	if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
	1252	return err
	1253	}
	1254	var addNick, addTime string
	1255	if len(msg.Params) >= 5 {
	1256	addNick = msg.Params[3]
	1257	addTime = msg.Params[4]
	1258	}
	1259
	1260	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1261	channel := dc.marshalEntity(uc.network, channel)
	1262
	1263	var params []string
	1264	if addNick != "" && addTime != "" {
	1265	addNick := dc.marshalEntity(uc.network, addNick)
	1266	params = []string{dc.nick, channel, mask, addNick, addTime}
	1267	} else {
	1268	params = []string{dc.nick, channel, mask}
	1269	}
	1270
	1271	dc.SendMessage(&irc.Message{
	1272	Prefix: dc.srv.prefix(),
	1273	Command: msg.Command,
	1274	Params: params,
	1275	})
	1276	})
	1277	case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
	1278	var channel, trailing string
	1279	if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
	1280	return err
	1281	}
	1282
	1283	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1284	upstreamChannel := dc.marshalEntity(uc.network, channel)
	1285	dc.SendMessage(&irc.Message{
	1286	Prefix: dc.srv.prefix(),
	1287	Command: msg.Command,
	1288	Params: []string{dc.nick, upstreamChannel, trailing},
	1289	})
	1290	})
[302]	1291	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1292	var command, reason string
	1293	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1294	return err
	1295	}
	1296
	1297	if command == "LIST" {
	1298	ok := uc.endPendingLISTs(false)
	1299	if !ok {
	1300	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1301	}
	1302	}
	1303
	1304	if downstreamID != 0 {
	1305	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1306	dc.SendMessage(&irc.Message{
	1307	Prefix: uc.srv.prefix(),
	1308	Command: msg.Command,
	1309	Params: []string{dc.nick, command, reason},
	1310	})
	1311	})
	1312	}
[155]	1313	case "ACK":
	1314	// Ignore
[198]	1315	case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
	1316	// Ignore
[16]	1317	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1318	// Ignore
	1319	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1320	// Ignore
	1321	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1322	// Ignore
[177]	1323	case irc.RPL_LISTSTART:
	1324	// Ignore
[14]	1325	case rpl_localusers, rpl_globalusers:
	1326	// Ignore
[96]	1327	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1328	// Ignore
[13]	1329	default:
[95]	1330	uc.logger.Printf("unhandled message: %v", msg)
[302]	1331	if downstreamID != 0 {
	1332	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1333	// best effort marshaling for unknown messages, replies and errors:
	1334	// most numerics start with the user nick, marshal it if that's the case
	1335	// otherwise, conservately keep the params without marshaling
	1336	params := msg.Params
	1337	if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
	1338	if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
	1339	params[0] = dc.nick
	1340	}
	1341	}
	1342	dc.SendMessage(&irc.Message{
	1343	Prefix: uc.srv.prefix(),
	1344	Command: msg.Command,
	1345	Params: params,
	1346	})
	1347	})
	1348	}
[13]	1349	}
[14]	1350	return nil
[13]	1351	}
	1352
[281]	1353	func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
	1354	caps := strings.Fields(capsStr)
	1355	for _, s := range caps {
	1356	kv := strings.SplitN(s, "=", 2)
	1357	k := strings.ToLower(kv[0])
	1358	var v string
	1359	if len(kv) == 2 {
	1360	v = kv[1]
	1361	}
	1362	uc.supportedCaps[k] = v
	1363	}
	1364	}
	1365
	1366	func (uc *upstreamConn) requestCaps() {
	1367	var requestCaps []string
[282]	1368	for c := range permanentUpstreamCaps {
[281]	1369	if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
	1370	requestCaps = append(requestCaps, c)
	1371	}
	1372	}
	1373
	1374	if uc.requestSASL() && !uc.caps["sasl"] {
	1375	requestCaps = append(requestCaps, "sasl")
	1376	}
	1377
[282]	1378	if len(requestCaps) == 0 {
	1379	return
	1380	}
	1381
	1382	uc.SendMessage(&irc.Message{
	1383	Command: "CAP",
	1384	Params: []string{"REQ", strings.Join(requestCaps, " ")},
	1385	})
	1386	}
	1387
	1388	func (uc *upstreamConn) requestSASL() bool {
	1389	if uc.network.SASL.Mechanism == "" {
	1390	return false
	1391	}
	1392
	1393	v, ok := uc.supportedCaps["sasl"]
	1394	if !ok {
	1395	return false
	1396	}
	1397	if v != "" {
	1398	mechanisms := strings.Split(v, ",")
	1399	found := false
	1400	for _, mech := range mechanisms {
	1401	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1402	found = true
	1403	break
	1404	}
	1405	}
	1406	if !found {
	1407	return false
	1408	}
	1409	}
	1410
	1411	return true
	1412	}
	1413
	1414	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1415	uc.caps[name] = ok
	1416
	1417	switch name {
	1418	case "sasl":
	1419	if !ok {
	1420	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1421	return nil
	1422	}
	1423
	1424	auth := &uc.network.SASL
	1425	switch auth.Mechanism {
	1426	case "PLAIN":
	1427	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1428	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
[307]	1429	case "EXTERNAL":
	1430	uc.logger.Printf("starting SASL EXTERNAL authentication")
	1431	uc.saslClient = sasl.NewExternalClient("")
[282]	1432	default:
	1433	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1434	}
	1435
[281]	1436	uc.SendMessage(&irc.Message{
[282]	1437	Command: "AUTHENTICATE",
	1438	Params: []string{auth.Mechanism},
[281]	1439	})
[282]	1440	default:
	1441	if permanentUpstreamCaps[name] {
	1442	break
	1443	}
	1444	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[281]	1445	}
[282]	1446	return nil
[281]	1447	}
	1448
[174]	1449	func splitSpace(s string) []string {
	1450	return strings.FieldsFunc(s, func(r rune) bool {
	1451	return r == ' '
	1452	})
	1453	}
	1454
[55]	1455	func (uc *upstreamConn) register() {
[77]	1456	uc.nick = uc.network.Nick
	1457	uc.username = uc.network.Username
	1458	if uc.username == "" {
	1459	uc.username = uc.nick
	1460	}
	1461	uc.realname = uc.network.Realname
	1462	if uc.realname == "" {
	1463	uc.realname = uc.nick
	1464	}
	1465
[60]	1466	uc.SendMessage(&irc.Message{
[92]	1467	Command: "CAP",
	1468	Params: []string{"LS", "302"},
	1469	})
	1470
[93]	1471	if uc.network.Pass != "" {
	1472	uc.SendMessage(&irc.Message{
	1473	Command: "PASS",
	1474	Params: []string{uc.network.Pass},
	1475	})
	1476	}
	1477
[92]	1478	uc.SendMessage(&irc.Message{
[13]	1479	Command: "NICK",
[69]	1480	Params: []string{uc.nick},
[60]	1481	})
	1482	uc.SendMessage(&irc.Message{
[13]	1483	Command: "USER",
[77]	1484	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1485	})
[44]	1486	}
[13]	1487
[197]	1488	func (uc *upstreamConn) runUntilRegistered() error {
	1489	for !uc.registered {
[212]	1490	msg, err := uc.ReadMessage()
[197]	1491	if err != nil {
	1492	return fmt.Errorf("failed to read message: %v", err)
	1493	}
	1494
	1495	if err := uc.handleMessage(msg); err != nil {
	1496	return fmt.Errorf("failed to handle message %q: %v", msg, err)
	1497	}
	1498	}
	1499
[263]	1500	for _, command := range uc.network.ConnectCommands {
	1501	m, err := irc.ParseMessage(command)
	1502	if err != nil {
	1503	uc.logger.Printf("failed to parse connect command %q: %v", command, err)
	1504	} else {
	1505	uc.SendMessage(m)
	1506	}
	1507	}
	1508
[197]	1509	return nil
	1510	}
	1511
[165]	1512	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1513	for {
[210]	1514	msg, err := uc.ReadMessage()
[13]	1515	if err == io.EOF {
	1516	break
	1517	} else if err != nil {
	1518	return fmt.Errorf("failed to read IRC command: %v", err)
	1519	}
	1520
[165]	1521	ch <- eventUpstreamMessage{msg, uc}
[13]	1522	}
	1523
[45]	1524	return nil
[13]	1525	}
[60]	1526
[303]	1527	func (uc upstreamConn) SendMessage(msg irc.Message) {
	1528	if !uc.caps["message-tags"] {
	1529	msg = msg.Copy()
	1530	msg.Tags = nil
	1531	}
	1532
	1533	uc.conn.SendMessage(msg)
	1534	}
	1535
[176]	1536	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[278]	1537	if uc.caps["labeled-response"] {
[155]	1538	if msg.Tags == nil {
	1539	msg.Tags = make(map[string]irc.TagValue)
	1540	}
[176]	1541	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1542	uc.nextLabelID++
[155]	1543	}
	1544	uc.SendMessage(msg)
	1545	}
[178]	1546
	1547	// TODO: handle moving logs when a network name changes, when support for this is added
[215]	1548	func (uc upstreamConn) appendLog(entity string, msg irc.Message) {
[178]	1549	if uc.srv.LogPath == "" {
	1550	return
	1551	}
[215]	1552
	1553	ml, ok := uc.messageLoggers[entity]
	1554	if !ok {
[248]	1555	ml = newMessageLogger(uc.network, entity)
[215]	1556	uc.messageLoggers[entity] = ml
[178]	1557	}
	1558
[215]	1559	if err := ml.Append(msg); err != nil {
	1560	uc.logger.Printf("failed to log message: %v", err)
[178]	1561	}
	1562	}
[198]	1563
[253]	1564	// appendHistory appends a message to the history. entity can be empty.
	1565	func (uc upstreamConn) appendHistory(entity string, msg irc.Message) {
[284]	1566	detached := false
	1567	if ch, ok := uc.network.channels[entity]; ok {
	1568	detached = ch.Detached
	1569	}
	1570
[253]	1571	// If no client is offline, no need to append the message to the buffer
[284]	1572	if len(uc.network.offlineClients) == 0 && !detached {
[253]	1573	return
	1574	}
	1575
	1576	history, ok := uc.network.history[entity]
	1577	if !ok {
	1578	history = &networkHistory{
	1579	offlineClients: make(map[string]uint64),
	1580	ring: NewRing(uc.srv.RingCap),
	1581	}
	1582	uc.network.history[entity] = history
	1583
	1584	for clientName, _ := range uc.network.offlineClients {
	1585	history.offlineClients[clientName] = 0
	1586	}
[284]	1587
	1588	if detached {
	1589	// If the channel is detached, online clients act as offline
	1590	// clients too
	1591	uc.forEachDownstream(func(dc *downstreamConn) {
	1592	history.offlineClients[dc.clientName] = 0
	1593	})
	1594	}
[253]	1595	}
	1596
	1597	history.ring.Produce(msg)
	1598	}
	1599
[245]	1600	// produce appends a message to the logs, adds it to the history and forwards
	1601	// it to connected downstream connections.
	1602	//
	1603	// If origin is not nil and origin doesn't support echo-message, the message is
	1604	// forwarded to all connections except origin.
[239]	1605	func (uc upstreamConn) produce(target string, msg irc.Message, origin *downstreamConn) {
	1606	if target != "" {
	1607	uc.appendLog(target, msg)
	1608	}
	1609
[253]	1610	uc.appendHistory(target, msg)
[227]	1611
[284]	1612	// Don't forward messages if it's a detached channel
	1613	if ch, ok := uc.network.channels[target]; ok && ch.Detached {
	1614	return
	1615	}
	1616
[227]	1617	uc.forEachDownstream(func(dc *downstreamConn) {
[238]	1618	if dc != origin \|\| dc.caps["echo-message"] {
[261]	1619	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[238]	1620	}
[227]	1621	})
[226]	1622	}
	1623
[198]	1624	func (uc *upstreamConn) updateAway() {
	1625	away := true
	1626	uc.forEachDownstream(func(*downstreamConn) {
	1627	away = false
	1628	})
	1629	if away == uc.away {
	1630	return
	1631	}
	1632	if away {
	1633	uc.SendMessage(&irc.Message{
	1634	Command: "AWAY",
	1635	Params: []string{"Auto away"},
	1636	})
	1637	} else {
	1638	uc.SendMessage(&irc.Message{
	1639	Command: "AWAY",
	1640	})
	1641	}
	1642	uc.away = away
	1643	}

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