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source: code/trunk/upstream.go@ 131

Last change on this file since 131 was 131, checked in by contact, 5 years ago
Move upstreamConn.history to network
File size: 20.2 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
	4	"crypto/tls"
[95]	5	"encoding/base64"
[13]	6	"fmt"
	7	"io"
	8	"net"
[19]	9	"strconv"
[17]	10	"strings"
[19]	11	"time"
[13]	12
[95]	13	"github.com/emersion/go-sasl"
[13]	14	"gopkg.in/irc.v3"
	15	)
	16
[19]	17	type upstreamChannel struct {
	18	Name string
[46]	19	conn *upstreamConn
[19]	20	Topic string
	21	TopicWho string
	22	TopicTime time.Time
	23	Status channelStatus
[35]	24	modes modeSet
[19]	25	Members map[string]membership
[25]	26	complete bool
[19]	27	}
	28
[13]	29	type upstreamConn struct {
[77]	30	network *network
[21]	31	logger Logger
[19]	32	net net.Conn
	33	irc *irc.Conn
	34	srv *Server
[37]	35	user *user
[102]	36	outgoing chan<- *irc.Message
[50]	37	ring *Ring
[16]	38
	39	serverName string
	40	availableUserModes string
	41	availableChannelModes string
	42	channelModesWithParam string
[19]	43
	44	registered bool
[42]	45	nick string
[77]	46	username string
	47	realname string
[33]	48	closed bool
[19]	49	modes modeSet
	50	channels map[string]*upstreamChannel
[92]	51	caps map[string]string
[95]	52
	53	saslClient sasl.Client
	54	saslStarted bool
[13]	55	}
	56
[77]	57	func connectToUpstream(network network) (upstreamConn, error) {
	58	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	59
[77]	60	addr := network.Addr
	61	if !strings.ContainsRune(addr, ':') {
	62	addr = addr + ":6697"
	63	}
	64
	65	logger.Printf("connecting to TLS server at address %q", addr)
	66	netConn, err := tls.Dial("tcp", addr, nil)
[33]	67	if err != nil {
[77]	68	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
[33]	69	}
	70
[67]	71	setKeepAlive(netConn)
	72
[102]	73	outgoing := make(chan *irc.Message, 64)
[55]	74	uc := &upstreamConn{
[79]	75	network: network,
[33]	76	logger: logger,
	77	net: netConn,
	78	irc: irc.NewConn(netConn),
[77]	79	srv: network.user.srv,
	80	user: network.user,
[102]	81	outgoing: outgoing,
[77]	82	ring: NewRing(network.user.srv.RingCap),
[33]	83	channels: make(map[string]*upstreamChannel),
[92]	84	caps: make(map[string]string),
[33]	85	}
	86
	87	go func() {
[102]	88	for msg := range outgoing {
[64]	89	if uc.srv.Debug {
	90	uc.logger.Printf("sent: %v", msg)
	91	}
[55]	92	if err := uc.irc.WriteMessage(msg); err != nil {
	93	uc.logger.Printf("failed to write message: %v", err)
[33]	94	}
	95	}
[55]	96	if err := uc.net.Close(); err != nil {
	97	uc.logger.Printf("failed to close connection: %v", err)
[45]	98	} else {
[55]	99	uc.logger.Printf("connection closed")
[45]	100	}
[33]	101	}()
	102
[55]	103	return uc, nil
[33]	104	}
	105
[55]	106	func (uc *upstreamConn) Close() error {
	107	if uc.closed {
[33]	108	return fmt.Errorf("upstream connection already closed")
	109	}
[102]	110	close(uc.outgoing)
[55]	111	uc.closed = true
[33]	112	return nil
	113	}
	114
[73]	115	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
	116	uc.user.forEachDownstream(func(dc *downstreamConn) {
[77]	117	if dc.network != nil && dc.network != uc.network {
[73]	118	return
	119	}
	120	f(dc)
	121	})
	122	}
	123
[55]	124	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	125	ch, ok := uc.channels[name]
[19]	126	if !ok {
	127	return nil, fmt.Errorf("unknown channel %q", name)
	128	}
	129	return ch, nil
	130	}
	131
[129]	132	func (uc *upstreamConn) isChannel(entity string) bool {
	133	for _, r := range entity {
	134	switch r {
	135	// TODO: support upstream ISUPPORT channel prefixes
	136	case '#', '&', '+', '!':
	137	return true
	138	}
	139	break
	140	}
	141	return false
	142	}
	143
[55]	144	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[13]	145	switch msg.Command {
	146	case "PING":
[60]	147	uc.SendMessage(&irc.Message{
[13]	148	Command: "PONG",
[68]	149	Params: msg.Params,
[60]	150	})
[33]	151	return nil
[17]	152	case "MODE":
[43]	153	var name, modeStr string
	154	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	155	return err
[17]	156	}
[35]	157
[129]	158	if !uc.isChannel(name) { // user mode change
[55]	159	if name != uc.nick {
[129]	160	return fmt.Errorf("received MODE message for unknown nick %q", name)
[35]	161	}
[55]	162	return uc.modes.Apply(modeStr)
[35]	163	} else { // channel mode change
[129]	164	// TODO: handle MODE channel mode arguments
[55]	165	ch, err := uc.getChannel(name)
[35]	166	if err != nil {
	167	return err
	168	}
	169	if err := ch.modes.Apply(modeStr); err != nil {
	170	return err
	171	}
[69]	172
[73]	173	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	174	dc.SendMessage(&irc.Message{
	175	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	176	Command: "MODE",
	177	Params: []string{dc.marshalChannel(uc, name), modeStr},
	178	})
	179	})
[46]	180	}
[18]	181	case "NOTICE":
[55]	182	uc.logger.Print(msg)
[97]	183
	184	uc.forEachDownstream(func(dc *downstreamConn) {
	185	dc.SendMessage(msg)
	186	})
[92]	187	case "CAP":
[95]	188	var subCmd string
	189	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	190	return err
[92]	191	}
[95]	192	subCmd = strings.ToUpper(subCmd)
	193	subParams := msg.Params[2:]
	194	switch subCmd {
	195	case "LS":
	196	if len(subParams) < 1 {
	197	return newNeedMoreParamsError(msg.Command)
	198	}
	199	caps := strings.Fields(subParams[len(subParams)-1])
	200	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	201
[95]	202	for _, s := range caps {
	203	kv := strings.SplitN(s, "=", 2)
	204	k := strings.ToLower(kv[0])
	205	var v string
	206	if len(kv) == 2 {
	207	v = kv[1]
	208	}
	209	uc.caps[k] = v
[92]	210	}
	211
[95]	212	if more {
	213	break // wait to receive all capabilities
	214	}
	215
	216	if uc.requestSASL() {
	217	uc.SendMessage(&irc.Message{
	218	Command: "CAP",
	219	Params: []string{"REQ", "sasl"},
	220	})
	221	break // we'll send CAP END after authentication is completed
	222	}
	223
[92]	224	uc.SendMessage(&irc.Message{
	225	Command: "CAP",
	226	Params: []string{"END"},
	227	})
[95]	228	case "ACK", "NAK":
	229	if len(subParams) < 1 {
	230	return newNeedMoreParamsError(msg.Command)
	231	}
	232	caps := strings.Fields(subParams[0])
	233
	234	for _, name := range caps {
	235	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	236	return err
	237	}
	238	}
	239
	240	if uc.saslClient == nil {
	241	uc.SendMessage(&irc.Message{
	242	Command: "CAP",
	243	Params: []string{"END"},
	244	})
	245	}
	246	default:
	247	uc.logger.Printf("unhandled message: %v", msg)
[92]	248	}
[95]	249	case "AUTHENTICATE":
	250	if uc.saslClient == nil {
	251	return fmt.Errorf("received unexpected AUTHENTICATE message")
	252	}
	253
	254	// TODO: if a challenge is 400 bytes long, buffer it
	255	var challengeStr string
	256	if err := parseMessageParams(msg, &challengeStr); err != nil {
	257	uc.SendMessage(&irc.Message{
	258	Command: "AUTHENTICATE",
	259	Params: []string{"*"},
	260	})
	261	return err
	262	}
	263
	264	var challenge []byte
	265	if challengeStr != "+" {
	266	var err error
	267	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	268	if err != nil {
	269	uc.SendMessage(&irc.Message{
	270	Command: "AUTHENTICATE",
	271	Params: []string{"*"},
	272	})
	273	return err
	274	}
	275	}
	276
	277	var resp []byte
	278	var err error
	279	if !uc.saslStarted {
	280	_, resp, err = uc.saslClient.Start()
	281	uc.saslStarted = true
	282	} else {
	283	resp, err = uc.saslClient.Next(challenge)
	284	}
	285	if err != nil {
	286	uc.SendMessage(&irc.Message{
	287	Command: "AUTHENTICATE",
	288	Params: []string{"*"},
	289	})
	290	return err
	291	}
	292
	293	// TODO: send response in multiple chunks if >= 400 bytes
	294	var respStr = "+"
	295	if resp != nil {
	296	respStr = base64.StdEncoding.EncodeToString(resp)
	297	}
	298
	299	uc.SendMessage(&irc.Message{
	300	Command: "AUTHENTICATE",
	301	Params: []string{respStr},
	302	})
[125]	303	case irc.RPL_LOGGEDIN:
[95]	304	var account string
	305	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	306	return err
	307	}
	308	uc.logger.Printf("logged in with account %q", account)
[125]	309	case irc.RPL_LOGGEDOUT:
[95]	310	uc.logger.Printf("logged out")
[125]	311	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	312	var info string
	313	if err := parseMessageParams(msg, nil, &info); err != nil {
	314	return err
	315	}
	316	switch msg.Command {
[125]	317	case irc.ERR_NICKLOCKED:
[95]	318	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	319	case irc.ERR_SASLFAIL:
[95]	320	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	321	case irc.ERR_SASLTOOLONG:
[95]	322	uc.logger.Printf("SASL message too long: %v", info)
	323	}
	324
	325	uc.saslClient = nil
	326	uc.saslStarted = false
	327
	328	uc.SendMessage(&irc.Message{
	329	Command: "CAP",
	330	Params: []string{"END"},
	331	})
[14]	332	case irc.RPL_WELCOME:
[55]	333	uc.registered = true
	334	uc.logger.Printf("connection registered")
[19]	335
[77]	336	channels, err := uc.srv.db.ListChannels(uc.network.ID)
	337	if err != nil {
	338	uc.logger.Printf("failed to list channels from database: %v", err)
	339	break
	340	}
	341
	342	for _, ch := range channels {
[60]	343	uc.SendMessage(&irc.Message{
[19]	344	Command: "JOIN",
[77]	345	Params: []string{ch.Name},
[60]	346	})
[19]	347	}
[16]	348	case irc.RPL_MYINFO:
[55]	349	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, &uc.availableChannelModes); err != nil {
[43]	350	return err
[16]	351	}
	352	if len(msg.Params) > 5 {
[55]	353	uc.channelModesWithParam = msg.Params[5]
[16]	354	}
[42]	355	case "NICK":
[83]	356	if msg.Prefix == nil {
	357	return fmt.Errorf("expected a prefix")
	358	}
	359
[43]	360	var newNick string
	361	if err := parseMessageParams(msg, &newNick); err != nil {
	362	return err
[42]	363	}
	364
[55]	365	if msg.Prefix.Name == uc.nick {
	366	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
	367	uc.nick = newNick
[42]	368	}
	369
[55]	370	for _, ch := range uc.channels {
[42]	371	if membership, ok := ch.Members[msg.Prefix.Name]; ok {
	372	delete(ch.Members, msg.Prefix.Name)
	373	ch.Members[newNick] = membership
	374	}
	375	}
[82]	376
	377	if msg.Prefix.Name != uc.nick {
	378	uc.forEachDownstream(func(dc *downstreamConn) {
	379	dc.SendMessage(&irc.Message{
	380	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	381	Command: "NICK",
	382	Params: []string{newNick},
	383	})
	384	})
	385	}
[69]	386	case "JOIN":
	387	if msg.Prefix == nil {
	388	return fmt.Errorf("expected a prefix")
	389	}
[42]	390
[43]	391	var channels string
	392	if err := parseMessageParams(msg, &channels); err != nil {
	393	return err
[19]	394	}
[34]	395
[43]	396	for _, ch := range strings.Split(channels, ",") {
[55]	397	if msg.Prefix.Name == uc.nick {
	398	uc.logger.Printf("joined channel %q", ch)
	399	uc.channels[ch] = &upstreamChannel{
[34]	400	Name: ch,
[55]	401	conn: uc,
[34]	402	Members: make(map[string]membership),
	403	}
	404	} else {
[55]	405	ch, err := uc.getChannel(ch)
[34]	406	if err != nil {
	407	return err
	408	}
	409	ch.Members[msg.Prefix.Name] = 0
[19]	410	}
[69]	411
[73]	412	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	413	dc.SendMessage(&irc.Message{
	414	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	415	Command: "JOIN",
	416	Params: []string{dc.marshalChannel(uc, ch)},
	417	})
	418	})
[19]	419	}
[69]	420	case "PART":
	421	if msg.Prefix == nil {
	422	return fmt.Errorf("expected a prefix")
	423	}
[34]	424
[43]	425	var channels string
	426	if err := parseMessageParams(msg, &channels); err != nil {
	427	return err
[34]	428	}
	429
[43]	430	for _, ch := range strings.Split(channels, ",") {
[55]	431	if msg.Prefix.Name == uc.nick {
	432	uc.logger.Printf("parted channel %q", ch)
	433	delete(uc.channels, ch)
[34]	434	} else {
[55]	435	ch, err := uc.getChannel(ch)
[34]	436	if err != nil {
	437	return err
	438	}
	439	delete(ch.Members, msg.Prefix.Name)
	440	}
[69]	441
[73]	442	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	443	dc.SendMessage(&irc.Message{
	444	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	445	Command: "PART",
	446	Params: []string{dc.marshalChannel(uc, ch)},
	447	})
	448	})
[34]	449	}
[83]	450	case "QUIT":
	451	if msg.Prefix == nil {
	452	return fmt.Errorf("expected a prefix")
	453	}
	454
	455	if msg.Prefix.Name == uc.nick {
	456	uc.logger.Printf("quit")
	457	}
	458
	459	for _, ch := range uc.channels {
	460	delete(ch.Members, msg.Prefix.Name)
	461	}
	462
	463	if msg.Prefix.Name != uc.nick {
	464	uc.forEachDownstream(func(dc *downstreamConn) {
	465	dc.SendMessage(&irc.Message{
	466	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	467	Command: "QUIT",
	468	Params: msg.Params,
	469	})
	470	})
	471	}
[19]	472	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	473	var name, topic string
	474	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	475	return err
[19]	476	}
[55]	477	ch, err := uc.getChannel(name)
[19]	478	if err != nil {
	479	return err
	480	}
	481	if msg.Command == irc.RPL_TOPIC {
[43]	482	ch.Topic = topic
[19]	483	} else {
	484	ch.Topic = ""
	485	}
	486	case "TOPIC":
[43]	487	var name string
[74]	488	if err := parseMessageParams(msg, &name); err != nil {
[43]	489	return err
[19]	490	}
[55]	491	ch, err := uc.getChannel(name)
[19]	492	if err != nil {
	493	return err
	494	}
	495	if len(msg.Params) > 1 {
	496	ch.Topic = msg.Params[1]
	497	} else {
	498	ch.Topic = ""
	499	}
[74]	500	uc.forEachDownstream(func(dc *downstreamConn) {
	501	params := []string{dc.marshalChannel(uc, name)}
	502	if ch.Topic != "" {
	503	params = append(params, ch.Topic)
	504	}
	505	dc.SendMessage(&irc.Message{
	506	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	507	Command: "TOPIC",
	508	Params: params,
	509	})
	510	})
[19]	511	case rpl_topicwhotime:
[43]	512	var name, who, timeStr string
	513	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	514	return err
[19]	515	}
[55]	516	ch, err := uc.getChannel(name)
[19]	517	if err != nil {
	518	return err
	519	}
[43]	520	ch.TopicWho = who
	521	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	522	if err != nil {
	523	return fmt.Errorf("failed to parse topic time: %v", err)
	524	}
	525	ch.TopicTime = time.Unix(sec, 0)
	526	case irc.RPL_NAMREPLY:
[43]	527	var name, statusStr, members string
	528	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	529	return err
[19]	530	}
[55]	531	ch, err := uc.getChannel(name)
[19]	532	if err != nil {
	533	return err
	534	}
	535
[43]	536	status, err := parseChannelStatus(statusStr)
[19]	537	if err != nil {
	538	return err
	539	}
	540	ch.Status = status
	541
[43]	542	for _, s := range strings.Split(members, " ") {
[19]	543	membership, nick := parseMembershipPrefix(s)
	544	ch.Members[nick] = membership
	545	}
	546	case irc.RPL_ENDOFNAMES:
[43]	547	var name string
	548	if err := parseMessageParams(msg, nil, &name); err != nil {
	549	return err
[25]	550	}
[55]	551	ch, err := uc.getChannel(name)
[25]	552	if err != nil {
	553	return err
	554	}
	555
[34]	556	if ch.complete {
	557	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	558	}
[25]	559	ch.complete = true
[27]	560
[73]	561	uc.forEachDownstream(func(dc *downstreamConn) {
[27]	562	forwardChannel(dc, ch)
[40]	563	})
[127]	564	case irc.RPL_WHOREPLY:
	565	var channel, username, host, server, nick, mode, trailing string
	566	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	567	return err
	568	}
	569
	570	parts := strings.SplitN(trailing, " ", 2)
	571	if len(parts) != 2 {
	572	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	573	}
	574	realname := parts[1]
	575	hops, err := strconv.Atoi(parts[0])
	576	if err != nil {
	577	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	578	}
	579	hops++
	580
	581	trailing = strconv.Itoa(hops) + " " + realname
	582
	583	uc.forEachDownstream(func(dc *downstreamConn) {
	584	channel := channel
	585	if channel != "*" {
	586	channel = dc.marshalChannel(uc, channel)
	587	}
	588	nick := dc.marshalNick(uc, nick)
	589	dc.SendMessage(&irc.Message{
	590	Prefix: dc.srv.prefix(),
	591	Command: irc.RPL_WHOREPLY,
	592	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	593	})
	594	})
	595	case irc.RPL_ENDOFWHO:
	596	var name string
	597	if err := parseMessageParams(msg, nil, &name); err != nil {
	598	return err
	599	}
	600
	601	uc.forEachDownstream(func(dc *downstreamConn) {
	602	name := name
	603	if name != "*" {
	604	// TODO: support WHO masks
	605	name = dc.marshalEntity(uc, name)
	606	}
	607	dc.SendMessage(&irc.Message{
	608	Prefix: dc.srv.prefix(),
	609	Command: irc.RPL_ENDOFWHO,
[128]	610	Params: []string{dc.nick, name, "End of WHO list"},
[127]	611	})
	612	})
[128]	613	case irc.RPL_WHOISUSER:
	614	var nick, username, host, realname string
	615	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	616	return err
	617	}
	618
	619	uc.forEachDownstream(func(dc *downstreamConn) {
	620	nick := dc.marshalNick(uc, nick)
	621	dc.SendMessage(&irc.Message{
	622	Prefix: dc.srv.prefix(),
	623	Command: irc.RPL_WHOISUSER,
	624	Params: []string{dc.nick, nick, username, host, "*", realname},
	625	})
	626	})
	627	case irc.RPL_WHOISSERVER:
	628	var nick, server, serverInfo string
	629	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	630	return err
	631	}
	632
	633	uc.forEachDownstream(func(dc *downstreamConn) {
	634	nick := dc.marshalNick(uc, nick)
	635	dc.SendMessage(&irc.Message{
	636	Prefix: dc.srv.prefix(),
	637	Command: irc.RPL_WHOISSERVER,
	638	Params: []string{dc.nick, nick, server, serverInfo},
	639	})
	640	})
	641	case irc.RPL_WHOISOPERATOR:
	642	var nick string
	643	if err := parseMessageParams(msg, nil, &nick); err != nil {
	644	return err
	645	}
	646
	647	uc.forEachDownstream(func(dc *downstreamConn) {
	648	nick := dc.marshalNick(uc, nick)
	649	dc.SendMessage(&irc.Message{
	650	Prefix: dc.srv.prefix(),
	651	Command: irc.RPL_WHOISOPERATOR,
	652	Params: []string{dc.nick, nick, "is an IRC operator"},
	653	})
	654	})
	655	case irc.RPL_WHOISIDLE:
	656	var nick string
	657	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	658	return err
	659	}
	660
	661	uc.forEachDownstream(func(dc *downstreamConn) {
	662	nick := dc.marshalNick(uc, nick)
	663	params := []string{dc.nick, nick}
	664	params = append(params, msg.Params[2:]...)
	665	dc.SendMessage(&irc.Message{
	666	Prefix: dc.srv.prefix(),
	667	Command: irc.RPL_WHOISIDLE,
	668	Params: params,
	669	})
	670	})
	671	case irc.RPL_WHOISCHANNELS:
	672	var nick, channelList string
	673	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	674	return err
	675	}
	676	channels := strings.Split(channelList, " ")
	677
	678	uc.forEachDownstream(func(dc *downstreamConn) {
	679	nick := dc.marshalNick(uc, nick)
	680	channelList := make([]string, len(channels))
	681	for i, channel := range channels {
	682	prefix, channel := parseMembershipPrefix(channel)
	683	channel = dc.marshalChannel(uc, channel)
	684	channelList[i] = prefix.String() + channel
	685	}
	686	channels := strings.Join(channelList, " ")
	687	dc.SendMessage(&irc.Message{
	688	Prefix: dc.srv.prefix(),
	689	Command: irc.RPL_WHOISCHANNELS,
	690	Params: []string{dc.nick, nick, channels},
	691	})
	692	})
	693	case irc.RPL_ENDOFWHOIS:
	694	var nick string
	695	if err := parseMessageParams(msg, nil, &nick); err != nil {
	696	return err
	697	}
	698
	699	uc.forEachDownstream(func(dc *downstreamConn) {
	700	nick := dc.marshalNick(uc, nick)
	701	dc.SendMessage(&irc.Message{
	702	Prefix: dc.srv.prefix(),
	703	Command: irc.RPL_ENDOFWHOIS,
	704	Params: []string{dc.nick, nick, "End of WHOIS list"},
	705	})
	706	})
[36]	707	case "PRIVMSG":
[117]	708	if msg.Prefix == nil {
	709	return fmt.Errorf("expected a prefix")
	710	}
	711
	712	var nick string
	713	if err := parseMessageParams(msg, &nick, nil); err != nil {
[69]	714	return err
	715	}
[117]	716
	717	if msg.Prefix.Name == serviceNick {
	718	uc.logger.Printf("skipping PRIVMSG from soju's service: %v", msg)
	719	break
	720	}
	721	if nick == serviceNick {
	722	uc.logger.Printf("skipping PRIVMSG to soju's service: %v", msg)
	723	break
	724	}
	725
[55]	726	uc.ring.Produce(msg)
[115]	727	case "INVITE":
	728	var nick string
	729	var channel string
	730	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	731	return err
	732	}
	733
	734	uc.forEachDownstream(func(dc *downstreamConn) {
	735	dc.SendMessage(&irc.Message{
	736	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	737	Command: "INVITE",
	738	Params: []string{dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	739	})
	740	})
[16]	741	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	742	// Ignore
	743	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	744	// Ignore
	745	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	746	// Ignore
	747	case rpl_localusers, rpl_globalusers:
	748	// Ignore
[96]	749	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	750	// Ignore
[13]	751	default:
[95]	752	uc.logger.Printf("unhandled message: %v", msg)
[13]	753	}
[14]	754	return nil
[13]	755	}
	756
[55]	757	func (uc *upstreamConn) register() {
[77]	758	uc.nick = uc.network.Nick
	759	uc.username = uc.network.Username
	760	if uc.username == "" {
	761	uc.username = uc.nick
	762	}
	763	uc.realname = uc.network.Realname
	764	if uc.realname == "" {
	765	uc.realname = uc.nick
	766	}
	767
[60]	768	uc.SendMessage(&irc.Message{
[92]	769	Command: "CAP",
	770	Params: []string{"LS", "302"},
	771	})
	772
[93]	773	if uc.network.Pass != "" {
	774	uc.SendMessage(&irc.Message{
	775	Command: "PASS",
	776	Params: []string{uc.network.Pass},
	777	})
	778	}
	779
[92]	780	uc.SendMessage(&irc.Message{
[13]	781	Command: "NICK",
[69]	782	Params: []string{uc.nick},
[60]	783	})
	784	uc.SendMessage(&irc.Message{
[13]	785	Command: "USER",
[77]	786	Params: []string{uc.username, "0", "*", uc.realname},
[60]	787	})
[44]	788	}
[13]	789
[95]	790	func (uc *upstreamConn) requestSASL() bool {
	791	if uc.network.SASL.Mechanism == "" {
	792	return false
	793	}
	794
	795	v, ok := uc.caps["sasl"]
	796	if !ok {
	797	return false
	798	}
	799	if v != "" {
	800	mechanisms := strings.Split(v, ",")
	801	found := false
	802	for _, mech := range mechanisms {
	803	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	804	found = true
	805	break
	806	}
	807	}
	808	if !found {
	809	return false
	810	}
	811	}
	812
	813	return true
	814	}
	815
	816	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	817	auth := &uc.network.SASL
	818	switch name {
	819	case "sasl":
	820	if !ok {
	821	uc.logger.Printf("server refused to acknowledge the SASL capability")
	822	return nil
	823	}
	824
	825	switch auth.Mechanism {
	826	case "PLAIN":
	827	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	828	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
	829	default:
	830	return fmt.Errorf("unsupported SASL mechanism %q", name)
	831	}
	832
	833	uc.SendMessage(&irc.Message{
	834	Command: "AUTHENTICATE",
	835	Params: []string{auth.Mechanism},
	836	})
	837	}
	838	return nil
	839	}
	840
[103]	841	func (uc *upstreamConn) readMessages(ch chan<- upstreamIncomingMessage) error {
[13]	842	for {
[55]	843	msg, err := uc.irc.ReadMessage()
[13]	844	if err == io.EOF {
	845	break
	846	} else if err != nil {
	847	return fmt.Errorf("failed to read IRC command: %v", err)
	848	}
	849
[64]	850	if uc.srv.Debug {
	851	uc.logger.Printf("received: %v", msg)
	852	}
	853
[103]	854	ch <- upstreamIncomingMessage{msg, uc}
[13]	855	}
	856
[45]	857	return nil
[13]	858	}
[60]	859
	860	func (uc upstreamConn) SendMessage(msg irc.Message) {
[102]	861	uc.outgoing <- msg
[60]	862	}

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