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source: code/trunk/downstream.go@ 130

Last change on this file since 130 was 130, checked in by contact, 5 years ago
Fix deadlocks in single-upstream mode
File size: 23.4 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
[91]	4	"crypto/tls"
[112]	5	"encoding/base64"
[13]	6	"fmt"
	7	"io"
	8	"net"
[108]	9	"strconv"
[39]	10	"strings"
[105]	11	"sync"
[91]	12	"time"
[13]	13
[112]	14	"github.com/emersion/go-sasl"
[85]	15	"golang.org/x/crypto/bcrypt"
[13]	16	"gopkg.in/irc.v3"
	17	)
	18
	19	type ircError struct {
	20	Message *irc.Message
	21	}
	22
[85]	23	func (err ircError) Error() string {
	24	return err.Message.String()
	25	}
	26
[13]	27	func newUnknownCommandError(cmd string) ircError {
	28	return ircError{&irc.Message{
	29	Command: irc.ERR_UNKNOWNCOMMAND,
	30	Params: []string{
	31	"*",
	32	cmd,
	33	"Unknown command",
	34	},
	35	}}
	36	}
	37
	38	func newNeedMoreParamsError(cmd string) ircError {
	39	return ircError{&irc.Message{
	40	Command: irc.ERR_NEEDMOREPARAMS,
	41	Params: []string{
	42	"*",
	43	cmd,
	44	"Not enough parameters",
	45	},
	46	}}
	47	}
	48
[85]	49	var errAuthFailed = ircError{&irc.Message{
	50	Command: irc.ERR_PASSWDMISMATCH,
	51	Params: []string{"*", "Invalid username or password"},
	52	}}
[13]	53
[104]	54	type ringMessage struct {
[69]	55	consumer *RingConsumer
	56	upstreamConn *upstreamConn
	57	}
	58
[13]	59	type downstreamConn struct {
[69]	60	net net.Conn
	61	irc *irc.Conn
	62	srv *Server
	63	logger Logger
[102]	64	outgoing chan *irc.Message
[104]	65	ringMessages chan ringMessage
[69]	66	closed chan struct{}
[22]	67
[100]	68	registered bool
	69	user *user
	70	nick string
	71	username string
	72	rawUsername string
	73	realname string
	74	password string // empty after authentication
	75	network *network // can be nil
[105]	76
[108]	77	negociatingCaps bool
	78	capVersion int
	79	caps map[string]bool
	80
[112]	81	saslServer sasl.Server
	82
[105]	83	lock sync.Mutex
	84	ourMessages map[*irc.Message]struct{}
[13]	85	}
	86
[22]	87	func newDownstreamConn(srv Server, netConn net.Conn) downstreamConn {
[55]	88	dc := &downstreamConn{
[69]	89	net: netConn,
	90	irc: irc.NewConn(netConn),
	91	srv: srv,
	92	logger: &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())},
[102]	93	outgoing: make(chan *irc.Message, 64),
[104]	94	ringMessages: make(chan ringMessage),
[69]	95	closed: make(chan struct{}),
[108]	96	caps: make(map[string]bool),
[105]	97	ourMessages: make(map[*irc.Message]struct{}),
[22]	98	}
[26]	99
	100	go func() {
[56]	101	if err := dc.writeMessages(); err != nil {
	102	dc.logger.Printf("failed to write message: %v", err)
[26]	103	}
[55]	104	if err := dc.net.Close(); err != nil {
	105	dc.logger.Printf("failed to close connection: %v", err)
[45]	106	} else {
[55]	107	dc.logger.Printf("connection closed")
[45]	108	}
[26]	109	}()
	110
[130]	111	dc.logger.Printf("new connection")
[55]	112	return dc
[22]	113	}
	114
[55]	115	func (dc downstreamConn) prefix() irc.Prefix {
[27]	116	return &irc.Prefix{
[55]	117	Name: dc.nick,
	118	User: dc.username,
[27]	119	// TODO: fill the host?
	120	}
	121	}
	122
[90]	123	func (dc downstreamConn) forEachNetwork(f func(network)) {
	124	if dc.network != nil {
	125	f(dc.network)
	126	} else {
	127	dc.user.forEachNetwork(f)
	128	}
	129	}
	130
[73]	131	func (dc downstreamConn) forEachUpstream(f func(upstreamConn)) {
	132	dc.user.forEachUpstream(func(uc *upstreamConn) {
[77]	133	if dc.network != nil && uc.network != dc.network {
[73]	134	return
	135	}
	136	f(uc)
	137	})
	138	}
	139
[89]	140	// upstream returns the upstream connection, if any. If there are zero or if
	141	// there are multiple upstream connections, it returns nil.
	142	func (dc downstreamConn) upstream() upstreamConn {
	143	if dc.network == nil {
	144	return nil
	145	}
	146
	147	var upstream *upstreamConn
	148	dc.forEachUpstream(func(uc *upstreamConn) {
	149	upstream = uc
	150	})
	151	return upstream
	152	}
	153
[129]	154	func (dc downstreamConn) marshalEntity(uc upstreamConn, entity string) string {
	155	if uc.isChannel(entity) {
	156	return dc.marshalChannel(uc, entity)
[119]	157	}
[129]	158	return dc.marshalNick(uc, entity)
[119]	159	}
	160
	161	func (dc downstreamConn) marshalChannel(uc upstreamConn, name string) string {
[130]	162	if dc.network != nil {
[119]	163	return name
	164	}
	165	return name + "/" + uc.network.GetName()
	166	}
	167
[127]	168	func (dc downstreamConn) unmarshalEntity(name string) (upstreamConn, string, error) {
[89]	169	if uc := dc.upstream(); uc != nil {
	170	return uc, name, nil
	171	}
	172
[127]	173	var conn *upstreamConn
[119]	174	if i := strings.LastIndexByte(name, '/'); i >= 0 {
[127]	175	network := name[i+1:]
[119]	176	name = name[:i]
	177
	178	dc.forEachUpstream(func(uc *upstreamConn) {
	179	if network != uc.network.GetName() {
	180	return
	181	}
	182	conn = uc
	183	})
	184	}
	185
[127]	186	if conn == nil {
[73]	187	return nil, "", ircError{&irc.Message{
	188	Command: irc.ERR_NOSUCHCHANNEL,
	189	Params: []string{name, "No such channel"},
	190	}}
[69]	191	}
[127]	192	return conn, name, nil
[69]	193	}
	194
	195	func (dc downstreamConn) marshalNick(uc upstreamConn, nick string) string {
	196	if nick == uc.nick {
	197	return dc.nick
	198	}
[130]	199	if dc.network != nil {
[119]	200	return nick
	201	}
	202	return nick + "/" + uc.network.GetName()
[69]	203	}
	204
	205	func (dc downstreamConn) marshalUserPrefix(uc upstreamConn, prefix irc.Prefix) irc.Prefix {
	206	if prefix.Name == uc.nick {
	207	return dc.prefix()
	208	}
[130]	209	if dc.network != nil {
[119]	210	return prefix
	211	}
	212	return &irc.Prefix{
	213	Name: prefix.Name + "/" + uc.network.GetName(),
	214	User: prefix.User,
	215	Host: prefix.Host,
	216	}
[69]	217	}
	218
[57]	219	func (dc *downstreamConn) isClosed() bool {
	220	select {
	221	case <-dc.closed:
	222	return true
	223	default:
	224	return false
	225	}
	226	}
	227
[103]	228	func (dc *downstreamConn) readMessages(ch chan<- downstreamIncomingMessage) error {
[22]	229	for {
[55]	230	msg, err := dc.irc.ReadMessage()
[22]	231	if err == io.EOF {
	232	break
	233	} else if err != nil {
	234	return fmt.Errorf("failed to read IRC command: %v", err)
	235	}
	236
[64]	237	if dc.srv.Debug {
	238	dc.logger.Printf("received: %v", msg)
	239	}
	240
[103]	241	ch <- downstreamIncomingMessage{msg, dc}
[22]	242	}
	243
[45]	244	return nil
[22]	245	}
	246
[56]	247	func (dc *downstreamConn) writeMessages() error {
[57]	248	for {
	249	var err error
	250	var closed bool
	251	select {
[102]	252	case msg := <-dc.outgoing:
[64]	253	if dc.srv.Debug {
	254	dc.logger.Printf("sent: %v", msg)
	255	}
[57]	256	err = dc.irc.WriteMessage(msg)
[104]	257	case ringMessage := <-dc.ringMessages:
	258	consumer, uc := ringMessage.consumer, ringMessage.upstreamConn
[57]	259	for {
	260	msg := consumer.Peek()
	261	if msg == nil {
	262	break
	263	}
[105]	264
	265	dc.lock.Lock()
	266	_, ours := dc.ourMessages[msg]
	267	delete(dc.ourMessages, msg)
	268	dc.lock.Unlock()
	269	if ours {
	270	// The message comes from our connection, don't echo it
	271	// back
[113]	272	consumer.Consume()
[105]	273	continue
	274	}
	275
[69]	276	msg = msg.Copy()
	277	switch msg.Command {
	278	case "PRIVMSG":
[119]	279	msg.Prefix = dc.marshalUserPrefix(uc, msg.Prefix)
	280	msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
[69]	281	default:
	282	panic("expected to consume a PRIVMSG message")
	283	}
[64]	284	if dc.srv.Debug {
	285	dc.logger.Printf("sent: %v", msg)
	286	}
[57]	287	err = dc.irc.WriteMessage(msg)
	288	if err != nil {
	289	break
	290	}
	291	consumer.Consume()
	292	}
	293	case <-dc.closed:
	294	closed = true
	295	}
	296	if err != nil {
[56]	297	return err
	298	}
[57]	299	if closed {
	300	break
	301	}
[56]	302	}
	303	return nil
	304	}
	305
[55]	306	func (dc *downstreamConn) Close() error {
[57]	307	if dc.isClosed() {
[26]	308	return fmt.Errorf("downstream connection already closed")
	309	}
[40]	310
[55]	311	if u := dc.user; u != nil {
[40]	312	u.lock.Lock()
	313	for i := range u.downstreamConns {
[55]	314	if u.downstreamConns[i] == dc {
[40]	315	u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
[63]	316	break
[40]	317	}
	318	}
	319	u.lock.Unlock()
[13]	320	}
[40]	321
[57]	322	close(dc.closed)
[45]	323	return nil
[13]	324	}
	325
[55]	326	func (dc downstreamConn) SendMessage(msg irc.Message) {
[102]	327	dc.outgoing <- msg
[54]	328	}
	329
[55]	330	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	331	switch msg.Command {
[28]	332	case "QUIT":
[55]	333	return dc.Close()
[13]	334	default:
[55]	335	if dc.registered {
	336	return dc.handleMessageRegistered(msg)
[13]	337	} else {
[55]	338	return dc.handleMessageUnregistered(msg)
[13]	339	}
	340	}
	341	}
	342
[55]	343	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	344	switch msg.Command {
	345	case "NICK":
[117]	346	var nick string
	347	if err := parseMessageParams(msg, &nick); err != nil {
[43]	348	return err
[13]	349	}
[117]	350	if nick == serviceNick {
	351	return ircError{&irc.Message{
	352	Command: irc.ERR_NICKNAMEINUSE,
	353	Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
	354	}}
	355	}
	356	dc.nick = nick
[13]	357	case "USER":
[117]	358	if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
[43]	359	return err
[13]	360	}
[85]	361	case "PASS":
	362	if err := parseMessageParams(msg, &dc.password); err != nil {
	363	return err
	364	}
[108]	365	case "CAP":
	366	var subCmd string
	367	if err := parseMessageParams(msg, &subCmd); err != nil {
	368	return err
	369	}
	370	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	371	return err
	372	}
[112]	373	case "AUTHENTICATE":
	374	if !dc.caps["sasl"] {
	375	return ircError{&irc.Message{
[125]	376	Command: irc.ERR_SASLFAIL,
[112]	377	Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
	378	}}
	379	}
	380	if len(msg.Params) == 0 {
	381	return ircError{&irc.Message{
[125]	382	Command: irc.ERR_SASLFAIL,
[112]	383	Params: []string{"*", "Missing AUTHENTICATE argument"},
	384	}}
	385	}
	386	if dc.nick == "" {
	387	return ircError{&irc.Message{
[125]	388	Command: irc.ERR_SASLFAIL,
[112]	389	Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
	390	}}
	391	}
	392
	393	var resp []byte
	394	if dc.saslServer == nil {
	395	mech := strings.ToUpper(msg.Params[0])
	396	switch mech {
	397	case "PLAIN":
	398	dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
	399	return dc.authenticate(username, password)
	400	}))
	401	default:
	402	return ircError{&irc.Message{
[125]	403	Command: irc.ERR_SASLFAIL,
[112]	404	Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
	405	}}
	406	}
	407	} else if msg.Params[0] == "*" {
	408	dc.saslServer = nil
	409	return ircError{&irc.Message{
[125]	410	Command: irc.ERR_SASLABORTED,
[112]	411	Params: []string{"*", "SASL authentication aborted"},
	412	}}
	413	} else if msg.Params[0] == "+" {
	414	resp = nil
	415	} else {
	416	// TODO: multi-line messages
	417	var err error
	418	resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
	419	if err != nil {
	420	dc.saslServer = nil
	421	return ircError{&irc.Message{
[125]	422	Command: irc.ERR_SASLFAIL,
[112]	423	Params: []string{"*", "Invalid base64-encoded response"},
	424	}}
	425	}
	426	}
	427
	428	challenge, done, err := dc.saslServer.Next(resp)
	429	if err != nil {
	430	dc.saslServer = nil
	431	if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
	432	return ircError{&irc.Message{
[125]	433	Command: irc.ERR_SASLFAIL,
[112]	434	Params: []string{"*", ircErr.Message.Params[1]},
	435	}}
	436	}
	437	dc.SendMessage(&irc.Message{
	438	Prefix: dc.srv.prefix(),
[125]	439	Command: irc.ERR_SASLFAIL,
[112]	440	Params: []string{"*", "SASL error"},
	441	})
	442	return fmt.Errorf("SASL authentication failed: %v", err)
	443	} else if done {
	444	dc.saslServer = nil
	445	dc.SendMessage(&irc.Message{
	446	Prefix: dc.srv.prefix(),
[125]	447	Command: irc.RPL_LOGGEDIN,
[112]	448	Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
	449	})
	450	dc.SendMessage(&irc.Message{
	451	Prefix: dc.srv.prefix(),
[125]	452	Command: irc.RPL_SASLSUCCESS,
[112]	453	Params: []string{dc.nick, "SASL authentication successful"},
	454	})
	455	} else {
	456	challengeStr := "+"
	457	if challenge != nil {
	458	challengeStr = base64.StdEncoding.EncodeToString(challenge)
	459	}
	460
	461	// TODO: multi-line messages
	462	dc.SendMessage(&irc.Message{
	463	Prefix: dc.srv.prefix(),
	464	Command: "AUTHENTICATE",
	465	Params: []string{challengeStr},
	466	})
	467	}
[13]	468	default:
[55]	469	dc.logger.Printf("unhandled message: %v", msg)
[13]	470	return newUnknownCommandError(msg.Command)
	471	}
[108]	472	if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
[55]	473	return dc.register()
[13]	474	}
	475	return nil
	476	}
	477
[108]	478	func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
[111]	479	cmd = strings.ToUpper(cmd)
	480
[108]	481	replyTo := dc.nick
	482	if !dc.registered {
	483	replyTo = "*"
	484	}
	485
	486	switch cmd {
	487	case "LS":
	488	if len(args) > 0 {
	489	var err error
	490	if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
	491	return err
	492	}
	493	}
	494
	495	var caps []string
[112]	496	if dc.capVersion >= 302 {
[108]	497	caps = append(caps, "sasl=PLAIN")
	498	} else {
	499	caps = append(caps, "sasl")
[112]	500	}
[108]	501
	502	// TODO: multi-line replies
	503	dc.SendMessage(&irc.Message{
	504	Prefix: dc.srv.prefix(),
	505	Command: "CAP",
	506	Params: []string{replyTo, "LS", strings.Join(caps, " ")},
	507	})
	508
	509	if !dc.registered {
	510	dc.negociatingCaps = true
	511	}
	512	case "LIST":
	513	var caps []string
	514	for name := range dc.caps {
	515	caps = append(caps, name)
	516	}
	517
	518	// TODO: multi-line replies
	519	dc.SendMessage(&irc.Message{
	520	Prefix: dc.srv.prefix(),
	521	Command: "CAP",
	522	Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
	523	})
	524	case "REQ":
	525	if len(args) == 0 {
	526	return ircError{&irc.Message{
	527	Command: err_invalidcapcmd,
	528	Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
	529	}}
	530	}
	531
	532	caps := strings.Fields(args[0])
	533	ack := true
	534	for _, name := range caps {
	535	name = strings.ToLower(name)
	536	enable := !strings.HasPrefix(name, "-")
	537	if !enable {
	538	name = strings.TrimPrefix(name, "-")
	539	}
	540
	541	enabled := dc.caps[name]
	542	if enable == enabled {
	543	continue
	544	}
	545
	546	switch name {
[112]	547	case "sasl":
	548	dc.caps[name] = enable
[108]	549	default:
	550	ack = false
	551	}
	552	}
	553
	554	reply := "NAK"
	555	if ack {
	556	reply = "ACK"
	557	}
	558	dc.SendMessage(&irc.Message{
	559	Prefix: dc.srv.prefix(),
	560	Command: "CAP",
	561	Params: []string{replyTo, reply, args[0]},
	562	})
	563	case "END":
	564	dc.negociatingCaps = false
	565	default:
	566	return ircError{&irc.Message{
	567	Command: err_invalidcapcmd,
	568	Params: []string{replyTo, cmd, "Unknown CAP command"},
	569	}}
	570	}
	571	return nil
	572	}
	573
[91]	574	func sanityCheckServer(addr string) error {
	575	dialer := net.Dialer{Timeout: 30 * time.Second}
	576	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	577	if err != nil {
	578	return err
	579	}
	580	return conn.Close()
	581	}
	582
[112]	583	func unmarshalUsername(rawUsername string) (username, network string) {
	584	username = rawUsername
[73]	585	if i := strings.LastIndexAny(username, "/@"); i >= 0 {
[112]	586	network = username[i+1:]
[73]	587	}
	588	if i := strings.IndexAny(username, "/@"); i >= 0 {
	589	username = username[:i]
	590	}
[112]	591	return username, network
	592	}
[73]	593
[112]	594	func (dc *downstreamConn) setNetwork(networkName string) error {
	595	if networkName == "" {
	596	return nil
	597	}
[85]	598
[112]	599	network := dc.user.getNetwork(networkName)
	600	if network == nil {
	601	addr := networkName
	602	if !strings.ContainsRune(addr, ':') {
	603	addr = addr + ":6697"
	604	}
	605
	606	dc.logger.Printf("trying to connect to new network %q", addr)
	607	if err := sanityCheckServer(addr); err != nil {
	608	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	609	return ircError{&irc.Message{
	610	Command: irc.ERR_PASSWDMISMATCH,
	611	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", networkName)},
	612	}}
	613	}
	614
	615	dc.logger.Printf("auto-saving network %q", networkName)
	616	var err error
[120]	617	network, err = dc.user.createNetwork(&Network{
	618	Addr: networkName,
	619	Nick: dc.nick,
	620	})
[112]	621	if err != nil {
	622	return err
	623	}
	624	}
	625
	626	dc.network = network
	627	return nil
	628	}
	629
	630	func (dc *downstreamConn) authenticate(username, password string) error {
	631	username, networkName := unmarshalUsername(username)
	632
[73]	633	u := dc.srv.getUser(username)
[38]	634	if u == nil {
[85]	635	dc.logger.Printf("failed authentication for %q: unknown username", username)
	636	return errAuthFailed
[37]	637	}
	638
[85]	639	err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
	640	if err != nil {
	641	dc.logger.Printf("failed authentication for %q: %v", username, err)
	642	return errAuthFailed
	643	}
	644
[112]	645	dc.user = u
[91]	646
[112]	647	return dc.setNetwork(networkName)
	648	}
[91]	649
[112]	650	func (dc *downstreamConn) register() error {
	651	password := dc.password
	652	dc.password = ""
	653	if dc.user == nil {
	654	if err := dc.authenticate(dc.rawUsername, password); err != nil {
	655	return err
[73]	656	}
[112]	657	} else if dc.network == nil {
	658	_, networkName := unmarshalUsername(dc.rawUsername)
	659	if err := dc.setNetwork(networkName); err != nil {
	660	return err
	661	}
[73]	662	}
	663
[55]	664	dc.registered = true
[112]	665	dc.username = dc.user.Username
[130]	666	dc.logger.Printf("registration complete for user %q", dc.username)
[13]	667
[112]	668	dc.user.lock.Lock()
	669	firstDownstream := len(dc.user.downstreamConns) == 0
	670	dc.user.downstreamConns = append(dc.user.downstreamConns, dc)
	671	dc.user.lock.Unlock()
[40]	672
[55]	673	dc.SendMessage(&irc.Message{
	674	Prefix: dc.srv.prefix(),
[13]	675	Command: irc.RPL_WELCOME,
[98]	676	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	677	})
[55]	678	dc.SendMessage(&irc.Message{
	679	Prefix: dc.srv.prefix(),
[13]	680	Command: irc.RPL_YOURHOST,
[55]	681	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	682	})
[55]	683	dc.SendMessage(&irc.Message{
	684	Prefix: dc.srv.prefix(),
[13]	685	Command: irc.RPL_CREATED,
[55]	686	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	687	})
[55]	688	dc.SendMessage(&irc.Message{
	689	Prefix: dc.srv.prefix(),
[13]	690	Command: irc.RPL_MYINFO,
[98]	691	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	692	})
[93]	693	// TODO: RPL_ISUPPORT
[55]	694	dc.SendMessage(&irc.Message{
	695	Prefix: dc.srv.prefix(),
[13]	696	Command: irc.ERR_NOMOTD,
[55]	697	Params: []string{dc.nick, "No MOTD"},
[54]	698	})
[13]	699
[73]	700	dc.forEachUpstream(func(uc *upstreamConn) {
[30]	701	for _, ch := range uc.channels {
	702	if ch.complete {
[55]	703	forwardChannel(dc, ch)
[30]	704	}
	705	}
[50]	706
[124]	707	historyName := dc.rawUsername
[57]	708
	709	var seqPtr *uint64
	710	if firstDownstream {
[109]	711	uc.lock.Lock()
[57]	712	seq, ok := uc.history[historyName]
[109]	713	uc.lock.Unlock()
[57]	714	if ok {
	715	seqPtr = &seq
[50]	716	}
	717	}
[57]	718
[59]	719	consumer, ch := uc.ring.NewConsumer(seqPtr)
[57]	720	go func() {
	721	for {
	722	var closed bool
	723	select {
	724	case <-ch:
[104]	725	dc.ringMessages <- ringMessage{consumer, uc}
[57]	726	case <-dc.closed:
	727	closed = true
	728	}
	729	if closed {
	730	break
	731	}
	732	}
	733
	734	seq := consumer.Close()
	735
	736	dc.user.lock.Lock()
	737	lastDownstream := len(dc.user.downstreamConns) == 0
	738	dc.user.lock.Unlock()
	739
	740	if lastDownstream {
[109]	741	uc.lock.Lock()
[57]	742	uc.history[historyName] = seq
[109]	743	uc.lock.Unlock()
[57]	744	}
	745	}()
[39]	746	})
[50]	747
[13]	748	return nil
	749	}
	750
[103]	751	func (dc *downstreamConn) runUntilRegistered() error {
	752	for !dc.registered {
	753	msg, err := dc.irc.ReadMessage()
[106]	754	if err != nil {
[103]	755	return fmt.Errorf("failed to read IRC command: %v", err)
	756	}
	757
[110]	758	if dc.srv.Debug {
	759	dc.logger.Printf("received: %v", msg)
	760	}
	761
[103]	762	err = dc.handleMessage(msg)
	763	if ircErr, ok := err.(ircError); ok {
	764	ircErr.Message.Prefix = dc.srv.prefix()
	765	dc.SendMessage(ircErr.Message)
	766	} else if err != nil {
	767	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	768	}
	769	}
	770
	771	return nil
	772	}
	773
[55]	774	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	775	switch msg.Command {
[111]	776	case "CAP":
	777	var subCmd string
	778	if err := parseMessageParams(msg, &subCmd); err != nil {
	779	return err
	780	}
	781	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	782	return err
	783	}
[107]	784	case "PING":
	785	dc.SendMessage(&irc.Message{
	786	Prefix: dc.srv.prefix(),
	787	Command: "PONG",
	788	Params: msg.Params,
	789	})
	790	return nil
[42]	791	case "USER":
[13]	792	return ircError{&irc.Message{
	793	Command: irc.ERR_ALREADYREGISTERED,
[55]	794	Params: []string{dc.nick, "You may not reregister"},
[13]	795	}}
[42]	796	case "NICK":
[90]	797	var nick string
	798	if err := parseMessageParams(msg, &nick); err != nil {
	799	return err
	800	}
	801
	802	var err error
	803	dc.forEachNetwork(func(n *network) {
	804	if err != nil {
	805	return
	806	}
	807	n.Nick = nick
	808	err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
	809	})
	810	if err != nil {
	811	return err
	812	}
	813
[73]	814	dc.forEachUpstream(func(uc *upstreamConn) {
[60]	815	uc.SendMessage(msg)
[42]	816	})
[69]	817	case "JOIN", "PART":
[48]	818	var name string
	819	if err := parseMessageParams(msg, &name); err != nil {
	820	return err
	821	}
	822
[127]	823	uc, upstreamName, err := dc.unmarshalEntity(name)
[69]	824	if err != nil {
	825	return ircError{&irc.Message{
	826	Command: irc.ERR_NOSUCHCHANNEL,
	827	Params: []string{name, err.Error()},
	828	}}
[48]	829	}
	830
[69]	831	uc.SendMessage(&irc.Message{
	832	Command: msg.Command,
	833	Params: []string{upstreamName},
	834	})
[89]	835
	836	switch msg.Command {
	837	case "JOIN":
	838	err := dc.srv.db.StoreChannel(uc.network.ID, &Channel{
	839	Name: upstreamName,
	840	})
	841	if err != nil {
	842	dc.logger.Printf("failed to create channel %q in DB: %v", upstreamName, err)
	843	}
	844	case "PART":
	845	if err := dc.srv.db.DeleteChannel(uc.network.ID, upstreamName); err != nil {
	846	dc.logger.Printf("failed to delete channel %q in DB: %v", upstreamName, err)
	847	}
	848	}
[69]	849	case "MODE":
[46]	850	var name string
	851	if err := parseMessageParams(msg, &name); err != nil {
	852	return err
	853	}
	854
	855	var modeStr string
	856	if len(msg.Params) > 1 {
	857	modeStr = msg.Params[1]
	858	}
	859
[129]	860	uc, upstreamName, err := dc.unmarshalEntity(name)
	861	if err != nil {
	862	return err
	863	}
[46]	864
[129]	865	if uc.isChannel(upstreamName) {
	866	// TODO: handle MODE channel mode arguments
[46]	867	if modeStr != "" {
[69]	868	uc.SendMessage(&irc.Message{
	869	Command: "MODE",
	870	Params: []string{upstreamName, modeStr},
	871	})
[46]	872	} else {
[69]	873	ch, ok := uc.channels[upstreamName]
	874	if !ok {
	875	return ircError{&irc.Message{
	876	Command: irc.ERR_NOSUCHCHANNEL,
[129]	877	Params: []string{dc.nick, name, "No such channel"},
[69]	878	}}
	879	}
	880
[55]	881	dc.SendMessage(&irc.Message{
	882	Prefix: dc.srv.prefix(),
[46]	883	Command: irc.RPL_CHANNELMODEIS,
[129]	884	Params: []string{dc.nick, name, string(ch.modes)},
[54]	885	})
[46]	886	}
	887	} else {
[55]	888	if name != dc.nick {
[46]	889	return ircError{&irc.Message{
	890	Command: irc.ERR_USERSDONTMATCH,
[55]	891	Params: []string{dc.nick, "Cannot change mode for other users"},
[46]	892	}}
	893	}
	894
	895	if modeStr != "" {
[73]	896	dc.forEachUpstream(func(uc *upstreamConn) {
[69]	897	uc.SendMessage(&irc.Message{
	898	Command: "MODE",
	899	Params: []string{uc.nick, modeStr},
	900	})
[46]	901	})
	902	} else {
[55]	903	dc.SendMessage(&irc.Message{
	904	Prefix: dc.srv.prefix(),
[46]	905	Command: irc.RPL_UMODEIS,
[129]	906	Params: []string{dc.nick, ""}, // TODO
[54]	907	})
[46]	908	}
	909	}
[127]	910	case "WHO":
	911	if len(msg.Params) == 0 {
	912	// TODO: support WHO without parameters
	913	dc.SendMessage(&irc.Message{
	914	Prefix: dc.srv.prefix(),
	915	Command: irc.RPL_ENDOFWHO,
	916	Params: []string{dc.nick, "*", "End of /WHO list."},
	917	})
	918	return nil
	919	}
	920
	921	// TODO: support WHO masks
	922	entity := msg.Params[0]
	923
	924	uc, upstreamName, err := dc.unmarshalEntity(entity)
	925	if err != nil {
	926	return err
	927	}
	928
	929	var params []string
	930	if len(msg.Params) == 2 {
	931	params = []string{upstreamName, msg.Params[1]}
	932	} else {
	933	params = []string{upstreamName}
	934	}
	935
	936	uc.SendMessage(&irc.Message{
	937	Command: "WHO",
	938	Params: params,
	939	})
[128]	940	case "WHOIS":
	941	if len(msg.Params) == 0 {
	942	return ircError{&irc.Message{
	943	Command: irc.ERR_NONICKNAMEGIVEN,
	944	Params: []string{dc.nick, "No nickname given"},
	945	}}
	946	}
	947
	948	var target, mask string
	949	if len(msg.Params) == 1 {
	950	target = ""
	951	mask = msg.Params[0]
	952	} else {
	953	target = msg.Params[0]
	954	mask = msg.Params[1]
	955	}
	956	// TODO: support multiple WHOIS users
	957	if i := strings.IndexByte(mask, ','); i >= 0 {
	958	mask = mask[:i]
	959	}
	960
	961	// TODO: support WHOIS masks
	962	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	963	if err != nil {
	964	return err
	965	}
	966
	967	var params []string
	968	if target != "" {
	969	params = []string{target, upstreamNick}
	970	} else {
	971	params = []string{upstreamNick}
	972	}
	973
	974	uc.SendMessage(&irc.Message{
	975	Command: "WHOIS",
	976	Params: params,
	977	})
[58]	978	case "PRIVMSG":
	979	var targetsStr, text string
	980	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	981	return err
	982	}
	983
	984	for _, name := range strings.Split(targetsStr, ",") {
[117]	985	if name == serviceNick {
	986	handleServicePRIVMSG(dc, text)
	987	continue
	988	}
	989
[127]	990	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	991	if err != nil {
	992	return err
	993	}
	994
[95]	995	if upstreamName == "NickServ" {
	996	dc.handleNickServPRIVMSG(uc, text)
	997	}
	998
[69]	999	uc.SendMessage(&irc.Message{
[58]	1000	Command: "PRIVMSG",
[69]	1001	Params: []string{upstreamName, text},
[60]	1002	})
[105]	1003
[113]	1004	echoMsg := &irc.Message{
	1005	Prefix: &irc.Prefix{
	1006	Name: uc.nick,
	1007	User: uc.username,
	1008	},
[114]	1009	Command: "PRIVMSG",
[113]	1010	Params: []string{upstreamName, text},
	1011	}
[105]	1012	dc.lock.Lock()
[113]	1013	dc.ourMessages[echoMsg] = struct{}{}
[105]	1014	dc.lock.Unlock()
	1015
[113]	1016	uc.ring.Produce(echoMsg)
[58]	1017	}
[13]	1018	default:
[55]	1019	dc.logger.Printf("unhandled message: %v", msg)
[13]	1020	return newUnknownCommandError(msg.Command)
	1021	}
[42]	1022	return nil
[13]	1023	}
[95]	1024
	1025	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	1026	username, password, ok := parseNickServCredentials(text, uc.nick)
	1027	if !ok {
	1028	return
	1029	}
	1030
	1031	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	1032	n := uc.network
	1033	n.SASL.Mechanism = "PLAIN"
	1034	n.SASL.Plain.Username = username
	1035	n.SASL.Plain.Password = password
	1036	if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
	1037	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	1038	}
	1039	}
	1040
	1041	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	1042	fields := strings.Fields(text)
	1043	if len(fields) < 2 {
	1044	return "", "", false
	1045	}
	1046	cmd := strings.ToUpper(fields[0])
	1047	params := fields[1:]
	1048	switch cmd {
	1049	case "REGISTER":
	1050	username = nick
	1051	password = params[0]
	1052	case "IDENTIFY":
	1053	if len(params) == 1 {
	1054	username = nick
	1055	} else {
	1056	username = params[0]
	1057	}
	1058	password = params[1]
	1059	}
	1060	return username, password, true
	1061	}

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