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source: code/trunk/downstream.go@ 136

Last change on this file since 136 was 136, checked in by contact, 5 years ago
Add network.upstream helper
File size: 23.5 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	}
[136]	146	return dc.network.upstream()
[89]	147	}
	148
[129]	149	func (dc downstreamConn) marshalEntity(uc upstreamConn, entity string) string {
	150	if uc.isChannel(entity) {
	151	return dc.marshalChannel(uc, entity)
[119]	152	}
[129]	153	return dc.marshalNick(uc, entity)
[119]	154	}
	155
	156	func (dc downstreamConn) marshalChannel(uc upstreamConn, name string) string {
[130]	157	if dc.network != nil {
[119]	158	return name
	159	}
	160	return name + "/" + uc.network.GetName()
	161	}
	162
[127]	163	func (dc downstreamConn) unmarshalEntity(name string) (upstreamConn, string, error) {
[89]	164	if uc := dc.upstream(); uc != nil {
	165	return uc, name, nil
	166	}
	167
[127]	168	var conn *upstreamConn
[119]	169	if i := strings.LastIndexByte(name, '/'); i >= 0 {
[127]	170	network := name[i+1:]
[119]	171	name = name[:i]
	172
	173	dc.forEachUpstream(func(uc *upstreamConn) {
	174	if network != uc.network.GetName() {
	175	return
	176	}
	177	conn = uc
	178	})
	179	}
	180
[127]	181	if conn == nil {
[73]	182	return nil, "", ircError{&irc.Message{
	183	Command: irc.ERR_NOSUCHCHANNEL,
	184	Params: []string{name, "No such channel"},
	185	}}
[69]	186	}
[127]	187	return conn, name, nil
[69]	188	}
	189
	190	func (dc downstreamConn) marshalNick(uc upstreamConn, nick string) string {
	191	if nick == uc.nick {
	192	return dc.nick
	193	}
[130]	194	if dc.network != nil {
[119]	195	return nick
	196	}
	197	return nick + "/" + uc.network.GetName()
[69]	198	}
	199
	200	func (dc downstreamConn) marshalUserPrefix(uc upstreamConn, prefix irc.Prefix) irc.Prefix {
	201	if prefix.Name == uc.nick {
	202	return dc.prefix()
	203	}
[130]	204	if dc.network != nil {
[119]	205	return prefix
	206	}
	207	return &irc.Prefix{
	208	Name: prefix.Name + "/" + uc.network.GetName(),
	209	User: prefix.User,
	210	Host: prefix.Host,
	211	}
[69]	212	}
	213
[57]	214	func (dc *downstreamConn) isClosed() bool {
	215	select {
	216	case <-dc.closed:
	217	return true
	218	default:
	219	return false
	220	}
	221	}
	222
[103]	223	func (dc *downstreamConn) readMessages(ch chan<- downstreamIncomingMessage) error {
[22]	224	for {
[55]	225	msg, err := dc.irc.ReadMessage()
[22]	226	if err == io.EOF {
	227	break
	228	} else if err != nil {
	229	return fmt.Errorf("failed to read IRC command: %v", err)
	230	}
	231
[64]	232	if dc.srv.Debug {
	233	dc.logger.Printf("received: %v", msg)
	234	}
	235
[103]	236	ch <- downstreamIncomingMessage{msg, dc}
[22]	237	}
	238
[45]	239	return nil
[22]	240	}
	241
[56]	242	func (dc *downstreamConn) writeMessages() error {
[57]	243	for {
	244	var err error
	245	var closed bool
	246	select {
[102]	247	case msg := <-dc.outgoing:
[64]	248	if dc.srv.Debug {
	249	dc.logger.Printf("sent: %v", msg)
	250	}
[57]	251	err = dc.irc.WriteMessage(msg)
[104]	252	case ringMessage := <-dc.ringMessages:
	253	consumer, uc := ringMessage.consumer, ringMessage.upstreamConn
[57]	254	for {
	255	msg := consumer.Peek()
	256	if msg == nil {
	257	break
	258	}
[105]	259
	260	dc.lock.Lock()
	261	_, ours := dc.ourMessages[msg]
	262	delete(dc.ourMessages, msg)
	263	dc.lock.Unlock()
	264	if ours {
	265	// The message comes from our connection, don't echo it
	266	// back
[113]	267	consumer.Consume()
[105]	268	continue
	269	}
	270
[69]	271	msg = msg.Copy()
	272	switch msg.Command {
	273	case "PRIVMSG":
[119]	274	msg.Prefix = dc.marshalUserPrefix(uc, msg.Prefix)
	275	msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
[69]	276	default:
	277	panic("expected to consume a PRIVMSG message")
	278	}
[64]	279	if dc.srv.Debug {
	280	dc.logger.Printf("sent: %v", msg)
	281	}
[57]	282	err = dc.irc.WriteMessage(msg)
	283	if err != nil {
	284	break
	285	}
	286	consumer.Consume()
	287	}
	288	case <-dc.closed:
	289	closed = true
	290	}
	291	if err != nil {
[56]	292	return err
	293	}
[57]	294	if closed {
	295	break
	296	}
[56]	297	}
	298	return nil
	299	}
	300
[55]	301	func (dc *downstreamConn) Close() error {
[57]	302	if dc.isClosed() {
[26]	303	return fmt.Errorf("downstream connection already closed")
	304	}
[40]	305
[55]	306	if u := dc.user; u != nil {
[40]	307	u.lock.Lock()
	308	for i := range u.downstreamConns {
[55]	309	if u.downstreamConns[i] == dc {
[40]	310	u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
[63]	311	break
[40]	312	}
	313	}
	314	u.lock.Unlock()
[13]	315	}
[40]	316
[57]	317	close(dc.closed)
[45]	318	return nil
[13]	319	}
	320
[55]	321	func (dc downstreamConn) SendMessage(msg irc.Message) {
[102]	322	dc.outgoing <- msg
[54]	323	}
	324
[55]	325	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	326	switch msg.Command {
[28]	327	case "QUIT":
[55]	328	return dc.Close()
[13]	329	default:
[55]	330	if dc.registered {
	331	return dc.handleMessageRegistered(msg)
[13]	332	} else {
[55]	333	return dc.handleMessageUnregistered(msg)
[13]	334	}
	335	}
	336	}
	337
[55]	338	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	339	switch msg.Command {
	340	case "NICK":
[117]	341	var nick string
	342	if err := parseMessageParams(msg, &nick); err != nil {
[43]	343	return err
[13]	344	}
[117]	345	if nick == serviceNick {
	346	return ircError{&irc.Message{
	347	Command: irc.ERR_NICKNAMEINUSE,
	348	Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
	349	}}
	350	}
	351	dc.nick = nick
[13]	352	case "USER":
[117]	353	if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
[43]	354	return err
[13]	355	}
[85]	356	case "PASS":
	357	if err := parseMessageParams(msg, &dc.password); err != nil {
	358	return err
	359	}
[108]	360	case "CAP":
	361	var subCmd string
	362	if err := parseMessageParams(msg, &subCmd); err != nil {
	363	return err
	364	}
	365	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	366	return err
	367	}
[112]	368	case "AUTHENTICATE":
	369	if !dc.caps["sasl"] {
	370	return ircError{&irc.Message{
[125]	371	Command: irc.ERR_SASLFAIL,
[112]	372	Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
	373	}}
	374	}
	375	if len(msg.Params) == 0 {
	376	return ircError{&irc.Message{
[125]	377	Command: irc.ERR_SASLFAIL,
[112]	378	Params: []string{"*", "Missing AUTHENTICATE argument"},
	379	}}
	380	}
	381	if dc.nick == "" {
	382	return ircError{&irc.Message{
[125]	383	Command: irc.ERR_SASLFAIL,
[112]	384	Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
	385	}}
	386	}
	387
	388	var resp []byte
	389	if dc.saslServer == nil {
	390	mech := strings.ToUpper(msg.Params[0])
	391	switch mech {
	392	case "PLAIN":
	393	dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
	394	return dc.authenticate(username, password)
	395	}))
	396	default:
	397	return ircError{&irc.Message{
[125]	398	Command: irc.ERR_SASLFAIL,
[112]	399	Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
	400	}}
	401	}
	402	} else if msg.Params[0] == "*" {
	403	dc.saslServer = nil
	404	return ircError{&irc.Message{
[125]	405	Command: irc.ERR_SASLABORTED,
[112]	406	Params: []string{"*", "SASL authentication aborted"},
	407	}}
	408	} else if msg.Params[0] == "+" {
	409	resp = nil
	410	} else {
	411	// TODO: multi-line messages
	412	var err error
	413	resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
	414	if err != nil {
	415	dc.saslServer = nil
	416	return ircError{&irc.Message{
[125]	417	Command: irc.ERR_SASLFAIL,
[112]	418	Params: []string{"*", "Invalid base64-encoded response"},
	419	}}
	420	}
	421	}
	422
	423	challenge, done, err := dc.saslServer.Next(resp)
	424	if err != nil {
	425	dc.saslServer = nil
	426	if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
	427	return ircError{&irc.Message{
[125]	428	Command: irc.ERR_SASLFAIL,
[112]	429	Params: []string{"*", ircErr.Message.Params[1]},
	430	}}
	431	}
	432	dc.SendMessage(&irc.Message{
	433	Prefix: dc.srv.prefix(),
[125]	434	Command: irc.ERR_SASLFAIL,
[112]	435	Params: []string{"*", "SASL error"},
	436	})
	437	return fmt.Errorf("SASL authentication failed: %v", err)
	438	} else if done {
	439	dc.saslServer = nil
	440	dc.SendMessage(&irc.Message{
	441	Prefix: dc.srv.prefix(),
[125]	442	Command: irc.RPL_LOGGEDIN,
[112]	443	Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
	444	})
	445	dc.SendMessage(&irc.Message{
	446	Prefix: dc.srv.prefix(),
[125]	447	Command: irc.RPL_SASLSUCCESS,
[112]	448	Params: []string{dc.nick, "SASL authentication successful"},
	449	})
	450	} else {
	451	challengeStr := "+"
[135]	452	if len(challenge) > 0 {
[112]	453	challengeStr = base64.StdEncoding.EncodeToString(challenge)
	454	}
	455
	456	// TODO: multi-line messages
	457	dc.SendMessage(&irc.Message{
	458	Prefix: dc.srv.prefix(),
	459	Command: "AUTHENTICATE",
	460	Params: []string{challengeStr},
	461	})
	462	}
[13]	463	default:
[55]	464	dc.logger.Printf("unhandled message: %v", msg)
[13]	465	return newUnknownCommandError(msg.Command)
	466	}
[108]	467	if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
[55]	468	return dc.register()
[13]	469	}
	470	return nil
	471	}
	472
[108]	473	func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
[111]	474	cmd = strings.ToUpper(cmd)
	475
[108]	476	replyTo := dc.nick
	477	if !dc.registered {
	478	replyTo = "*"
	479	}
	480
	481	switch cmd {
	482	case "LS":
	483	if len(args) > 0 {
	484	var err error
	485	if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
	486	return err
	487	}
	488	}
	489
	490	var caps []string
[112]	491	if dc.capVersion >= 302 {
[108]	492	caps = append(caps, "sasl=PLAIN")
	493	} else {
	494	caps = append(caps, "sasl")
[112]	495	}
[108]	496
	497	// TODO: multi-line replies
	498	dc.SendMessage(&irc.Message{
	499	Prefix: dc.srv.prefix(),
	500	Command: "CAP",
	501	Params: []string{replyTo, "LS", strings.Join(caps, " ")},
	502	})
	503
	504	if !dc.registered {
	505	dc.negociatingCaps = true
	506	}
	507	case "LIST":
	508	var caps []string
	509	for name := range dc.caps {
	510	caps = append(caps, name)
	511	}
	512
	513	// TODO: multi-line replies
	514	dc.SendMessage(&irc.Message{
	515	Prefix: dc.srv.prefix(),
	516	Command: "CAP",
	517	Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
	518	})
	519	case "REQ":
	520	if len(args) == 0 {
	521	return ircError{&irc.Message{
	522	Command: err_invalidcapcmd,
	523	Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
	524	}}
	525	}
	526
	527	caps := strings.Fields(args[0])
	528	ack := true
	529	for _, name := range caps {
	530	name = strings.ToLower(name)
	531	enable := !strings.HasPrefix(name, "-")
	532	if !enable {
	533	name = strings.TrimPrefix(name, "-")
	534	}
	535
	536	enabled := dc.caps[name]
	537	if enable == enabled {
	538	continue
	539	}
	540
	541	switch name {
[112]	542	case "sasl":
	543	dc.caps[name] = enable
[108]	544	default:
	545	ack = false
	546	}
	547	}
	548
	549	reply := "NAK"
	550	if ack {
	551	reply = "ACK"
	552	}
	553	dc.SendMessage(&irc.Message{
	554	Prefix: dc.srv.prefix(),
	555	Command: "CAP",
	556	Params: []string{replyTo, reply, args[0]},
	557	})
	558	case "END":
	559	dc.negociatingCaps = false
	560	default:
	561	return ircError{&irc.Message{
	562	Command: err_invalidcapcmd,
	563	Params: []string{replyTo, cmd, "Unknown CAP command"},
	564	}}
	565	}
	566	return nil
	567	}
	568
[91]	569	func sanityCheckServer(addr string) error {
	570	dialer := net.Dialer{Timeout: 30 * time.Second}
	571	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	572	if err != nil {
	573	return err
	574	}
	575	return conn.Close()
	576	}
	577
[112]	578	func unmarshalUsername(rawUsername string) (username, network string) {
	579	username = rawUsername
[73]	580	if i := strings.LastIndexAny(username, "/@"); i >= 0 {
[112]	581	network = username[i+1:]
[73]	582	}
	583	if i := strings.IndexAny(username, "/@"); i >= 0 {
	584	username = username[:i]
	585	}
[112]	586	return username, network
	587	}
[73]	588
[112]	589	func (dc *downstreamConn) setNetwork(networkName string) error {
	590	if networkName == "" {
	591	return nil
	592	}
[85]	593
[112]	594	network := dc.user.getNetwork(networkName)
	595	if network == nil {
	596	addr := networkName
	597	if !strings.ContainsRune(addr, ':') {
	598	addr = addr + ":6697"
	599	}
	600
	601	dc.logger.Printf("trying to connect to new network %q", addr)
	602	if err := sanityCheckServer(addr); err != nil {
	603	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	604	return ircError{&irc.Message{
	605	Command: irc.ERR_PASSWDMISMATCH,
	606	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", networkName)},
	607	}}
	608	}
	609
	610	dc.logger.Printf("auto-saving network %q", networkName)
	611	var err error
[120]	612	network, err = dc.user.createNetwork(&Network{
	613	Addr: networkName,
	614	Nick: dc.nick,
	615	})
[112]	616	if err != nil {
	617	return err
	618	}
	619	}
	620
	621	dc.network = network
	622	return nil
	623	}
	624
	625	func (dc *downstreamConn) authenticate(username, password string) error {
	626	username, networkName := unmarshalUsername(username)
	627
[73]	628	u := dc.srv.getUser(username)
[38]	629	if u == nil {
[85]	630	dc.logger.Printf("failed authentication for %q: unknown username", username)
	631	return errAuthFailed
[37]	632	}
	633
[85]	634	err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
	635	if err != nil {
	636	dc.logger.Printf("failed authentication for %q: %v", username, err)
	637	return errAuthFailed
	638	}
	639
[112]	640	dc.user = u
[91]	641
[112]	642	return dc.setNetwork(networkName)
	643	}
[91]	644
[112]	645	func (dc *downstreamConn) register() error {
	646	password := dc.password
	647	dc.password = ""
	648	if dc.user == nil {
	649	if err := dc.authenticate(dc.rawUsername, password); err != nil {
	650	return err
[73]	651	}
[112]	652	} else if dc.network == nil {
	653	_, networkName := unmarshalUsername(dc.rawUsername)
	654	if err := dc.setNetwork(networkName); err != nil {
	655	return err
	656	}
[73]	657	}
	658
[55]	659	dc.registered = true
[112]	660	dc.username = dc.user.Username
[130]	661	dc.logger.Printf("registration complete for user %q", dc.username)
[13]	662
[112]	663	dc.user.lock.Lock()
	664	firstDownstream := len(dc.user.downstreamConns) == 0
	665	dc.user.downstreamConns = append(dc.user.downstreamConns, dc)
	666	dc.user.lock.Unlock()
[40]	667
[55]	668	dc.SendMessage(&irc.Message{
	669	Prefix: dc.srv.prefix(),
[13]	670	Command: irc.RPL_WELCOME,
[98]	671	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	672	})
[55]	673	dc.SendMessage(&irc.Message{
	674	Prefix: dc.srv.prefix(),
[13]	675	Command: irc.RPL_YOURHOST,
[55]	676	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	677	})
[55]	678	dc.SendMessage(&irc.Message{
	679	Prefix: dc.srv.prefix(),
[13]	680	Command: irc.RPL_CREATED,
[55]	681	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	682	})
[55]	683	dc.SendMessage(&irc.Message{
	684	Prefix: dc.srv.prefix(),
[13]	685	Command: irc.RPL_MYINFO,
[98]	686	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	687	})
[93]	688	// TODO: RPL_ISUPPORT
[55]	689	dc.SendMessage(&irc.Message{
	690	Prefix: dc.srv.prefix(),
[13]	691	Command: irc.ERR_NOMOTD,
[55]	692	Params: []string{dc.nick, "No MOTD"},
[54]	693	})
[13]	694
[73]	695	dc.forEachUpstream(func(uc *upstreamConn) {
[30]	696	for _, ch := range uc.channels {
	697	if ch.complete {
[132]	698	dc.SendMessage(&irc.Message{
	699	Prefix: dc.prefix(),
	700	Command: "JOIN",
	701	Params: []string{dc.marshalChannel(ch.conn, ch.Name)},
	702	})
	703
[55]	704	forwardChannel(dc, ch)
[30]	705	}
	706	}
[50]	707
[124]	708	historyName := dc.rawUsername
[57]	709
	710	var seqPtr *uint64
	711	if firstDownstream {
[131]	712	uc.network.lock.Lock()
	713	seq, ok := uc.network.history[historyName]
	714	uc.network.lock.Unlock()
[57]	715	if ok {
	716	seqPtr = &seq
[50]	717	}
	718	}
[57]	719
[59]	720	consumer, ch := uc.ring.NewConsumer(seqPtr)
[57]	721	go func() {
	722	for {
	723	var closed bool
	724	select {
	725	case <-ch:
[104]	726	dc.ringMessages <- ringMessage{consumer, uc}
[57]	727	case <-dc.closed:
	728	closed = true
	729	}
	730	if closed {
	731	break
	732	}
	733	}
	734
	735	seq := consumer.Close()
	736
	737	dc.user.lock.Lock()
	738	lastDownstream := len(dc.user.downstreamConns) == 0
	739	dc.user.lock.Unlock()
	740
	741	if lastDownstream {
[131]	742	uc.network.lock.Lock()
	743	uc.network.history[historyName] = seq
	744	uc.network.lock.Unlock()
[57]	745	}
	746	}()
[39]	747	})
[50]	748
[13]	749	return nil
	750	}
	751
[103]	752	func (dc *downstreamConn) runUntilRegistered() error {
	753	for !dc.registered {
	754	msg, err := dc.irc.ReadMessage()
[106]	755	if err != nil {
[103]	756	return fmt.Errorf("failed to read IRC command: %v", err)
	757	}
	758
[110]	759	if dc.srv.Debug {
	760	dc.logger.Printf("received: %v", msg)
	761	}
	762
[103]	763	err = dc.handleMessage(msg)
	764	if ircErr, ok := err.(ircError); ok {
	765	ircErr.Message.Prefix = dc.srv.prefix()
	766	dc.SendMessage(ircErr.Message)
	767	} else if err != nil {
	768	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	769	}
	770	}
	771
	772	return nil
	773	}
	774
[55]	775	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	776	switch msg.Command {
[111]	777	case "CAP":
	778	var subCmd string
	779	if err := parseMessageParams(msg, &subCmd); err != nil {
	780	return err
	781	}
	782	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	783	return err
	784	}
[107]	785	case "PING":
	786	dc.SendMessage(&irc.Message{
	787	Prefix: dc.srv.prefix(),
	788	Command: "PONG",
	789	Params: msg.Params,
	790	})
	791	return nil
[42]	792	case "USER":
[13]	793	return ircError{&irc.Message{
	794	Command: irc.ERR_ALREADYREGISTERED,
[55]	795	Params: []string{dc.nick, "You may not reregister"},
[13]	796	}}
[42]	797	case "NICK":
[90]	798	var nick string
	799	if err := parseMessageParams(msg, &nick); err != nil {
	800	return err
	801	}
	802
	803	var err error
	804	dc.forEachNetwork(func(n *network) {
	805	if err != nil {
	806	return
	807	}
	808	n.Nick = nick
	809	err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
	810	})
	811	if err != nil {
	812	return err
	813	}
	814
[73]	815	dc.forEachUpstream(func(uc *upstreamConn) {
[60]	816	uc.SendMessage(msg)
[42]	817	})
[69]	818	case "JOIN", "PART":
[48]	819	var name string
	820	if err := parseMessageParams(msg, &name); err != nil {
	821	return err
	822	}
	823
[127]	824	uc, upstreamName, err := dc.unmarshalEntity(name)
[69]	825	if err != nil {
	826	return ircError{&irc.Message{
	827	Command: irc.ERR_NOSUCHCHANNEL,
	828	Params: []string{name, err.Error()},
	829	}}
[48]	830	}
	831
[69]	832	uc.SendMessage(&irc.Message{
	833	Command: msg.Command,
	834	Params: []string{upstreamName},
	835	})
[89]	836
	837	switch msg.Command {
	838	case "JOIN":
	839	err := dc.srv.db.StoreChannel(uc.network.ID, &Channel{
	840	Name: upstreamName,
	841	})
	842	if err != nil {
	843	dc.logger.Printf("failed to create channel %q in DB: %v", upstreamName, err)
	844	}
	845	case "PART":
	846	if err := dc.srv.db.DeleteChannel(uc.network.ID, upstreamName); err != nil {
	847	dc.logger.Printf("failed to delete channel %q in DB: %v", upstreamName, err)
	848	}
	849	}
[69]	850	case "MODE":
[46]	851	var name string
	852	if err := parseMessageParams(msg, &name); err != nil {
	853	return err
	854	}
	855
	856	var modeStr string
	857	if len(msg.Params) > 1 {
	858	modeStr = msg.Params[1]
	859	}
	860
[129]	861	uc, upstreamName, err := dc.unmarshalEntity(name)
	862	if err != nil {
	863	return err
	864	}
[46]	865
[129]	866	if uc.isChannel(upstreamName) {
	867	// TODO: handle MODE channel mode arguments
[46]	868	if modeStr != "" {
[69]	869	uc.SendMessage(&irc.Message{
	870	Command: "MODE",
	871	Params: []string{upstreamName, modeStr},
	872	})
[46]	873	} else {
[69]	874	ch, ok := uc.channels[upstreamName]
	875	if !ok {
	876	return ircError{&irc.Message{
	877	Command: irc.ERR_NOSUCHCHANNEL,
[129]	878	Params: []string{dc.nick, name, "No such channel"},
[69]	879	}}
	880	}
	881
[55]	882	dc.SendMessage(&irc.Message{
	883	Prefix: dc.srv.prefix(),
[46]	884	Command: irc.RPL_CHANNELMODEIS,
[129]	885	Params: []string{dc.nick, name, string(ch.modes)},
[54]	886	})
[46]	887	}
	888	} else {
[55]	889	if name != dc.nick {
[46]	890	return ircError{&irc.Message{
	891	Command: irc.ERR_USERSDONTMATCH,
[55]	892	Params: []string{dc.nick, "Cannot change mode for other users"},
[46]	893	}}
	894	}
	895
	896	if modeStr != "" {
[73]	897	dc.forEachUpstream(func(uc *upstreamConn) {
[69]	898	uc.SendMessage(&irc.Message{
	899	Command: "MODE",
	900	Params: []string{uc.nick, modeStr},
	901	})
[46]	902	})
	903	} else {
[55]	904	dc.SendMessage(&irc.Message{
	905	Prefix: dc.srv.prefix(),
[46]	906	Command: irc.RPL_UMODEIS,
[129]	907	Params: []string{dc.nick, ""}, // TODO
[54]	908	})
[46]	909	}
	910	}
[127]	911	case "WHO":
	912	if len(msg.Params) == 0 {
	913	// TODO: support WHO without parameters
	914	dc.SendMessage(&irc.Message{
	915	Prefix: dc.srv.prefix(),
	916	Command: irc.RPL_ENDOFWHO,
	917	Params: []string{dc.nick, "*", "End of /WHO list."},
	918	})
	919	return nil
	920	}
	921
	922	// TODO: support WHO masks
	923	entity := msg.Params[0]
	924
	925	uc, upstreamName, err := dc.unmarshalEntity(entity)
	926	if err != nil {
	927	return err
	928	}
	929
	930	var params []string
	931	if len(msg.Params) == 2 {
	932	params = []string{upstreamName, msg.Params[1]}
	933	} else {
	934	params = []string{upstreamName}
	935	}
	936
	937	uc.SendMessage(&irc.Message{
	938	Command: "WHO",
	939	Params: params,
	940	})
[128]	941	case "WHOIS":
	942	if len(msg.Params) == 0 {
	943	return ircError{&irc.Message{
	944	Command: irc.ERR_NONICKNAMEGIVEN,
	945	Params: []string{dc.nick, "No nickname given"},
	946	}}
	947	}
	948
	949	var target, mask string
	950	if len(msg.Params) == 1 {
	951	target = ""
	952	mask = msg.Params[0]
	953	} else {
	954	target = msg.Params[0]
	955	mask = msg.Params[1]
	956	}
	957	// TODO: support multiple WHOIS users
	958	if i := strings.IndexByte(mask, ','); i >= 0 {
	959	mask = mask[:i]
	960	}
	961
	962	// TODO: support WHOIS masks
	963	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	964	if err != nil {
	965	return err
	966	}
	967
	968	var params []string
	969	if target != "" {
	970	params = []string{target, upstreamNick}
	971	} else {
	972	params = []string{upstreamNick}
	973	}
	974
	975	uc.SendMessage(&irc.Message{
	976	Command: "WHOIS",
	977	Params: params,
	978	})
[58]	979	case "PRIVMSG":
	980	var targetsStr, text string
	981	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	982	return err
	983	}
	984
	985	for _, name := range strings.Split(targetsStr, ",") {
[117]	986	if name == serviceNick {
	987	handleServicePRIVMSG(dc, text)
	988	continue
	989	}
	990
[127]	991	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	992	if err != nil {
	993	return err
	994	}
	995
[95]	996	if upstreamName == "NickServ" {
	997	dc.handleNickServPRIVMSG(uc, text)
	998	}
	999
[69]	1000	uc.SendMessage(&irc.Message{
[58]	1001	Command: "PRIVMSG",
[69]	1002	Params: []string{upstreamName, text},
[60]	1003	})
[105]	1004
[113]	1005	echoMsg := &irc.Message{
	1006	Prefix: &irc.Prefix{
	1007	Name: uc.nick,
	1008	User: uc.username,
	1009	},
[114]	1010	Command: "PRIVMSG",
[113]	1011	Params: []string{upstreamName, text},
	1012	}
[105]	1013	dc.lock.Lock()
[113]	1014	dc.ourMessages[echoMsg] = struct{}{}
[105]	1015	dc.lock.Unlock()
	1016
[113]	1017	uc.ring.Produce(echoMsg)
[58]	1018	}
[13]	1019	default:
[55]	1020	dc.logger.Printf("unhandled message: %v", msg)
[13]	1021	return newUnknownCommandError(msg.Command)
	1022	}
[42]	1023	return nil
[13]	1024	}
[95]	1025
	1026	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	1027	username, password, ok := parseNickServCredentials(text, uc.nick)
	1028	if !ok {
	1029	return
	1030	}
	1031
	1032	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	1033	n := uc.network
	1034	n.SASL.Mechanism = "PLAIN"
	1035	n.SASL.Plain.Username = username
	1036	n.SASL.Plain.Password = password
	1037	if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
	1038	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	1039	}
	1040	}
	1041
	1042	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	1043	fields := strings.Fields(text)
	1044	if len(fields) < 2 {
	1045	return "", "", false
	1046	}
	1047	cmd := strings.ToUpper(fields[0])
	1048	params := fields[1:]
	1049	switch cmd {
	1050	case "REGISTER":
	1051	username = nick
	1052	password = params[0]
	1053	case "IDENTIFY":
	1054	if len(params) == 1 {
	1055	username = nick
	1056	} else {
	1057	username = params[0]
	1058	}
	1059	password = params[1]
	1060	}
	1061	return username, password, true
	1062	}

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