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source: code/trunk/downstream.go@ 229

Last change on this file since 229 was 228, checked in by contact, 5 years ago

Remove channel from ring buffer consumers

This is unused.

File size: 30.2 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
	54	type downstreamConn struct {
[210]	55	conn
[22]	56
[210]	57	id uint64
	58
[100]	59	registered bool
	60	user *user
	61	nick string
	62	rawUsername string
[168]	63	networkName string
[183]	64	clientName string
[100]	65	realname string
[141]	66	hostname string
[100]	67	password string // empty after authentication
	68	network *network // can be nil
[105]	69
[204]	70	ringConsumers map[network]RingConsumer
	71
[108]	72	negociatingCaps bool
	73	capVersion int
	74
[112]	75	saslServer sasl.Server
	76
[105]	77	lock sync.Mutex
	78	ourMessages map[*irc.Message]struct{}
[216]	79	caps map[string]bool
[13]	80	}
	81
[154]	82	func newDownstreamConn(srv Server, netConn net.Conn, id uint64) downstreamConn {
[210]	83	logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())}
[55]	84	dc := &downstreamConn{
[210]	85	conn: *newConn(srv, netConn, logger),
[204]	86	id: id,
	87	ringConsumers: make(map[network]RingConsumer),
[216]	88	ourMessages: make(map[*irc.Message]struct{}),
[204]	89	caps: make(map[string]bool),
[22]	90	}
[141]	91	dc.hostname = netConn.RemoteAddr().String()
	92	if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
	93	dc.hostname = host
	94	}
[55]	95	return dc
[22]	96	}
	97
[55]	98	func (dc downstreamConn) prefix() irc.Prefix {
[27]	99	return &irc.Prefix{
[55]	100	Name: dc.nick,
[184]	101	User: dc.user.Username,
[141]	102	Host: dc.hostname,
[27]	103	}
	104	}
	105
[90]	106	func (dc downstreamConn) forEachNetwork(f func(network)) {
	107	if dc.network != nil {
	108	f(dc.network)
	109	} else {
	110	dc.user.forEachNetwork(f)
	111	}
	112	}
	113
[73]	114	func (dc downstreamConn) forEachUpstream(f func(upstreamConn)) {
	115	dc.user.forEachUpstream(func(uc *upstreamConn) {
[77]	116	if dc.network != nil && uc.network != dc.network {
[73]	117	return
	118	}
	119	f(uc)
	120	})
	121	}
	122
[89]	123	// upstream returns the upstream connection, if any. If there are zero or if
	124	// there are multiple upstream connections, it returns nil.
	125	func (dc downstreamConn) upstream() upstreamConn {
	126	if dc.network == nil {
	127	return nil
	128	}
[136]	129	return dc.network.upstream()
[89]	130	}
	131
[129]	132	func (dc downstreamConn) marshalEntity(uc upstreamConn, entity string) string {
	133	if uc.isChannel(entity) {
	134	return dc.marshalChannel(uc, entity)
[119]	135	}
[129]	136	return dc.marshalNick(uc, entity)
[119]	137	}
	138
	139	func (dc downstreamConn) marshalChannel(uc upstreamConn, name string) string {
[130]	140	if dc.network != nil {
[119]	141	return name
	142	}
	143	return name + "/" + uc.network.GetName()
	144	}
	145
[127]	146	func (dc downstreamConn) unmarshalEntity(name string) (upstreamConn, string, error) {
[89]	147	if uc := dc.upstream(); uc != nil {
	148	return uc, name, nil
	149	}
	150
[127]	151	var conn *upstreamConn
[119]	152	if i := strings.LastIndexByte(name, '/'); i >= 0 {
[127]	153	network := name[i+1:]
[119]	154	name = name[:i]
	155
	156	dc.forEachUpstream(func(uc *upstreamConn) {
	157	if network != uc.network.GetName() {
	158	return
	159	}
	160	conn = uc
	161	})
	162	}
	163
[127]	164	if conn == nil {
[73]	165	return nil, "", ircError{&irc.Message{
	166	Command: irc.ERR_NOSUCHCHANNEL,
	167	Params: []string{name, "No such channel"},
	168	}}
[69]	169	}
[127]	170	return conn, name, nil
[69]	171	}
	172
	173	func (dc downstreamConn) marshalNick(uc upstreamConn, nick string) string {
	174	if nick == uc.nick {
	175	return dc.nick
	176	}
[130]	177	if dc.network != nil {
[119]	178	return nick
	179	}
	180	return nick + "/" + uc.network.GetName()
[69]	181	}
	182
	183	func (dc downstreamConn) marshalUserPrefix(uc upstreamConn, prefix irc.Prefix) irc.Prefix {
	184	if prefix.Name == uc.nick {
	185	return dc.prefix()
	186	}
[130]	187	if dc.network != nil {
[119]	188	return prefix
	189	}
	190	return &irc.Prefix{
	191	Name: prefix.Name + "/" + uc.network.GetName(),
	192	User: prefix.User,
	193	Host: prefix.Host,
	194	}
[69]	195	}
	196
[165]	197	func (dc *downstreamConn) readMessages(ch chan<- event) error {
[22]	198	for {
[210]	199	msg, err := dc.ReadMessage()
[22]	200	if err == io.EOF {
	201	break
	202	} else if err != nil {
	203	return fmt.Errorf("failed to read IRC command: %v", err)
	204	}
	205
[165]	206	ch <- eventDownstreamMessage{msg, dc}
[22]	207	}
	208
[45]	209	return nil
[22]	210	}
	211
[216]	212	func (dc *downstreamConn) getCap(name string) bool {
	213	dc.lock.Lock()
	214	defer dc.lock.Unlock()
	215	return dc.caps[name]
	216	}
	217
[55]	218	func (dc downstreamConn) SendMessage(msg irc.Message) {
[216]	219	if !dc.getCap("message-tags") {
	220	msg = msg.Copy()
	221	for name := range msg.Tags {
	222	supported := false
	223	switch name {
	224	case "time":
	225	supported = dc.getCap("server-time")
	226	}
	227	if !supported {
	228	delete(msg.Tags, name)
	229	}
	230	}
	231	}
	232
[210]	233	dc.conn.SendMessage(msg)
[54]	234	}
	235
[227]	236	func (dc downstreamConn) sendFromUpstream(msg irc.Message, uc *upstreamConn) {
	237	dc.lock.Lock()
	238	_, ours := dc.ourMessages[msg]
	239	delete(dc.ourMessages, msg)
	240	dc.lock.Unlock()
	241	if ours && !dc.getCap("echo-message") {
	242	// The message comes from our connection, don't echo it
	243	// back
	244	return
	245	}
	246
	247	msg = msg.Copy()
	248	switch msg.Command {
	249	case "PRIVMSG", "NOTICE":
	250	msg.Prefix = dc.marshalUserPrefix(uc, msg.Prefix)
	251	msg.Params[0] = dc.marshalEntity(uc, msg.Params[0])
	252	default:
	253	panic(fmt.Sprintf("unexpected %q message", msg.Command))
	254	}
	255
	256	dc.SendMessage(msg)
	257	}
	258
[55]	259	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	260	switch msg.Command {
[28]	261	case "QUIT":
[55]	262	return dc.Close()
[13]	263	default:
[55]	264	if dc.registered {
	265	return dc.handleMessageRegistered(msg)
[13]	266	} else {
[55]	267	return dc.handleMessageUnregistered(msg)
[13]	268	}
	269	}
	270	}
	271
[55]	272	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	273	switch msg.Command {
	274	case "NICK":
[117]	275	var nick string
	276	if err := parseMessageParams(msg, &nick); err != nil {
[43]	277	return err
[13]	278	}
[117]	279	if nick == serviceNick {
	280	return ircError{&irc.Message{
	281	Command: irc.ERR_NICKNAMEINUSE,
	282	Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
	283	}}
	284	}
	285	dc.nick = nick
[13]	286	case "USER":
[117]	287	if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
[43]	288	return err
[13]	289	}
[85]	290	case "PASS":
	291	if err := parseMessageParams(msg, &dc.password); err != nil {
	292	return err
	293	}
[108]	294	case "CAP":
	295	var subCmd string
	296	if err := parseMessageParams(msg, &subCmd); err != nil {
	297	return err
	298	}
	299	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	300	return err
	301	}
[112]	302	case "AUTHENTICATE":
[216]	303	if !dc.getCap("sasl") {
[112]	304	return ircError{&irc.Message{
[125]	305	Command: irc.ERR_SASLFAIL,
[112]	306	Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
	307	}}
	308	}
	309	if len(msg.Params) == 0 {
	310	return ircError{&irc.Message{
[125]	311	Command: irc.ERR_SASLFAIL,
[112]	312	Params: []string{"*", "Missing AUTHENTICATE argument"},
	313	}}
	314	}
	315	if dc.nick == "" {
	316	return ircError{&irc.Message{
[125]	317	Command: irc.ERR_SASLFAIL,
[112]	318	Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
	319	}}
	320	}
	321
	322	var resp []byte
	323	if dc.saslServer == nil {
	324	mech := strings.ToUpper(msg.Params[0])
	325	switch mech {
	326	case "PLAIN":
	327	dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
	328	return dc.authenticate(username, password)
	329	}))
	330	default:
	331	return ircError{&irc.Message{
[125]	332	Command: irc.ERR_SASLFAIL,
[112]	333	Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
	334	}}
	335	}
	336	} else if msg.Params[0] == "*" {
	337	dc.saslServer = nil
	338	return ircError{&irc.Message{
[125]	339	Command: irc.ERR_SASLABORTED,
[112]	340	Params: []string{"*", "SASL authentication aborted"},
	341	}}
	342	} else if msg.Params[0] == "+" {
	343	resp = nil
	344	} else {
	345	// TODO: multi-line messages
	346	var err error
	347	resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
	348	if err != nil {
	349	dc.saslServer = nil
	350	return ircError{&irc.Message{
[125]	351	Command: irc.ERR_SASLFAIL,
[112]	352	Params: []string{"*", "Invalid base64-encoded response"},
	353	}}
	354	}
	355	}
	356
	357	challenge, done, err := dc.saslServer.Next(resp)
	358	if err != nil {
	359	dc.saslServer = nil
	360	if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
	361	return ircError{&irc.Message{
[125]	362	Command: irc.ERR_SASLFAIL,
[112]	363	Params: []string{"*", ircErr.Message.Params[1]},
	364	}}
	365	}
	366	dc.SendMessage(&irc.Message{
	367	Prefix: dc.srv.prefix(),
[125]	368	Command: irc.ERR_SASLFAIL,
[112]	369	Params: []string{"*", "SASL error"},
	370	})
	371	return fmt.Errorf("SASL authentication failed: %v", err)
	372	} else if done {
	373	dc.saslServer = nil
	374	dc.SendMessage(&irc.Message{
	375	Prefix: dc.srv.prefix(),
[125]	376	Command: irc.RPL_LOGGEDIN,
[112]	377	Params: []string{dc.nick, dc.nick, dc.user.Username, "You are now logged in"},
	378	})
	379	dc.SendMessage(&irc.Message{
	380	Prefix: dc.srv.prefix(),
[125]	381	Command: irc.RPL_SASLSUCCESS,
[112]	382	Params: []string{dc.nick, "SASL authentication successful"},
	383	})
	384	} else {
	385	challengeStr := "+"
[135]	386	if len(challenge) > 0 {
[112]	387	challengeStr = base64.StdEncoding.EncodeToString(challenge)
	388	}
	389
	390	// TODO: multi-line messages
	391	dc.SendMessage(&irc.Message{
	392	Prefix: dc.srv.prefix(),
	393	Command: "AUTHENTICATE",
	394	Params: []string{challengeStr},
	395	})
	396	}
[13]	397	default:
[55]	398	dc.logger.Printf("unhandled message: %v", msg)
[13]	399	return newUnknownCommandError(msg.Command)
	400	}
[108]	401	if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
[55]	402	return dc.register()
[13]	403	}
	404	return nil
	405	}
	406
[108]	407	func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
[111]	408	cmd = strings.ToUpper(cmd)
	409
[108]	410	replyTo := dc.nick
	411	if !dc.registered {
	412	replyTo = "*"
	413	}
	414
	415	switch cmd {
	416	case "LS":
	417	if len(args) > 0 {
	418	var err error
	419	if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
	420	return err
	421	}
	422	}
	423
[211]	424	caps := []string{"message-tags", "server-time", "echo-message"}
[194]	425
[112]	426	if dc.capVersion >= 302 {
[108]	427	caps = append(caps, "sasl=PLAIN")
	428	} else {
	429	caps = append(caps, "sasl")
[112]	430	}
[108]	431
	432	// TODO: multi-line replies
	433	dc.SendMessage(&irc.Message{
	434	Prefix: dc.srv.prefix(),
	435	Command: "CAP",
	436	Params: []string{replyTo, "LS", strings.Join(caps, " ")},
	437	})
	438
	439	if !dc.registered {
	440	dc.negociatingCaps = true
	441	}
	442	case "LIST":
	443	var caps []string
[216]	444	dc.lock.Lock()
[108]	445	for name := range dc.caps {
	446	caps = append(caps, name)
	447	}
[216]	448	dc.lock.Unlock()
[108]	449
	450	// TODO: multi-line replies
	451	dc.SendMessage(&irc.Message{
	452	Prefix: dc.srv.prefix(),
	453	Command: "CAP",
	454	Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
	455	})
	456	case "REQ":
	457	if len(args) == 0 {
	458	return ircError{&irc.Message{
	459	Command: err_invalidcapcmd,
	460	Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
	461	}}
	462	}
	463
	464	caps := strings.Fields(args[0])
	465	ack := true
[216]	466	dc.lock.Lock()
[108]	467	for _, name := range caps {
	468	name = strings.ToLower(name)
	469	enable := !strings.HasPrefix(name, "-")
	470	if !enable {
	471	name = strings.TrimPrefix(name, "-")
	472	}
	473
	474	enabled := dc.caps[name]
	475	if enable == enabled {
	476	continue
	477	}
	478
	479	switch name {
[211]	480	case "sasl", "message-tags", "server-time", "echo-message":
[112]	481	dc.caps[name] = enable
[108]	482	default:
	483	ack = false
	484	}
	485	}
[216]	486	dc.lock.Unlock()
[108]	487
	488	reply := "NAK"
	489	if ack {
	490	reply = "ACK"
	491	}
	492	dc.SendMessage(&irc.Message{
	493	Prefix: dc.srv.prefix(),
	494	Command: "CAP",
	495	Params: []string{replyTo, reply, args[0]},
	496	})
	497	case "END":
	498	dc.negociatingCaps = false
	499	default:
	500	return ircError{&irc.Message{
	501	Command: err_invalidcapcmd,
	502	Params: []string{replyTo, cmd, "Unknown CAP command"},
	503	}}
	504	}
	505	return nil
	506	}
	507
[91]	508	func sanityCheckServer(addr string) error {
	509	dialer := net.Dialer{Timeout: 30 * time.Second}
	510	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	511	if err != nil {
	512	return err
	513	}
	514	return conn.Close()
	515	}
	516
[183]	517	func unmarshalUsername(rawUsername string) (username, client, network string) {
[112]	518	username = rawUsername
[183]	519
	520	i := strings.IndexAny(username, "/@")
	521	j := strings.LastIndexAny(username, "/@")
	522	if i >= 0 {
	523	username = rawUsername[:i]
[73]	524	}
[183]	525	if j >= 0 {
[190]	526	if rawUsername[j] == '@' {
	527	client = rawUsername[j+1:]
	528	} else {
	529	network = rawUsername[j+1:]
	530	}
[73]	531	}
[183]	532	if i >= 0 && j >= 0 && i < j {
[190]	533	if rawUsername[i] == '@' {
	534	client = rawUsername[i+1 : j]
	535	} else {
	536	network = rawUsername[i+1 : j]
	537	}
[183]	538	}
	539
	540	return username, client, network
[112]	541	}
[73]	542
[168]	543	func (dc *downstreamConn) authenticate(username, password string) error {
[183]	544	username, clientName, networkName := unmarshalUsername(username)
[168]	545
[173]	546	u, err := dc.srv.db.GetUser(username)
	547	if err != nil {
	548	dc.logger.Printf("failed authentication for %q: %v", username, err)
[168]	549	return errAuthFailed
	550	}
	551
[173]	552	err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
[168]	553	if err != nil {
	554	dc.logger.Printf("failed authentication for %q: %v", username, err)
	555	return errAuthFailed
	556	}
	557
[173]	558	dc.user = dc.srv.getUser(username)
	559	if dc.user == nil {
	560	dc.logger.Printf("failed authentication for %q: user not active", username)
	561	return errAuthFailed
	562	}
[183]	563	dc.clientName = clientName
[168]	564	dc.networkName = networkName
	565	return nil
	566	}
	567
	568	func (dc *downstreamConn) register() error {
	569	if dc.registered {
	570	return fmt.Errorf("tried to register twice")
	571	}
	572
	573	password := dc.password
	574	dc.password = ""
	575	if dc.user == nil {
	576	if err := dc.authenticate(dc.rawUsername, password); err != nil {
	577	return err
	578	}
	579	}
	580
[183]	581	if dc.clientName == "" && dc.networkName == "" {
	582	_, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
[168]	583	}
	584
	585	dc.registered = true
[184]	586	dc.logger.Printf("registration complete for user %q", dc.user.Username)
[168]	587	return nil
	588	}
	589
	590	func (dc *downstreamConn) loadNetwork() error {
	591	if dc.networkName == "" {
[112]	592	return nil
	593	}
[85]	594
[168]	595	network := dc.user.getNetwork(dc.networkName)
[112]	596	if network == nil {
[168]	597	addr := dc.networkName
[112]	598	if !strings.ContainsRune(addr, ':') {
	599	addr = addr + ":6697"
	600	}
	601
	602	dc.logger.Printf("trying to connect to new network %q", addr)
	603	if err := sanityCheckServer(addr); err != nil {
	604	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	605	return ircError{&irc.Message{
	606	Command: irc.ERR_PASSWDMISMATCH,
[168]	607	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
[112]	608	}}
	609	}
	610
[168]	611	dc.logger.Printf("auto-saving network %q", dc.networkName)
[112]	612	var err error
[120]	613	network, err = dc.user.createNetwork(&Network{
[168]	614	Addr: dc.networkName,
[120]	615	Nick: dc.nick,
	616	})
[112]	617	if err != nil {
	618	return err
	619	}
	620	}
	621
	622	dc.network = network
	623	return nil
	624	}
	625
[168]	626	func (dc *downstreamConn) welcome() error {
	627	if dc.user == nil \|\| !dc.registered {
	628	panic("tried to welcome an unregistered connection")
[37]	629	}
	630
[168]	631	// TODO: doing this might take some time. We should do it in dc.register
	632	// instead, but we'll potentially be adding a new network and this must be
	633	// done in the user goroutine.
	634	if err := dc.loadNetwork(); err != nil {
	635	return err
[85]	636	}
	637
[185]	638	// Only send history if we're the first connected client with that name and
	639	// network
	640	sendHistory := true
	641	dc.user.forEachDownstream(func(conn *downstreamConn) {
	642	if dc.clientName == conn.clientName && dc.network == conn.network {
	643	sendHistory = false
	644	}
	645	})
[40]	646
[55]	647	dc.SendMessage(&irc.Message{
	648	Prefix: dc.srv.prefix(),
[13]	649	Command: irc.RPL_WELCOME,
[98]	650	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	651	})
[55]	652	dc.SendMessage(&irc.Message{
	653	Prefix: dc.srv.prefix(),
[13]	654	Command: irc.RPL_YOURHOST,
[55]	655	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	656	})
[55]	657	dc.SendMessage(&irc.Message{
	658	Prefix: dc.srv.prefix(),
[13]	659	Command: irc.RPL_CREATED,
[55]	660	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	661	})
[55]	662	dc.SendMessage(&irc.Message{
	663	Prefix: dc.srv.prefix(),
[13]	664	Command: irc.RPL_MYINFO,
[98]	665	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	666	})
[93]	667	// TODO: RPL_ISUPPORT
[55]	668	dc.SendMessage(&irc.Message{
	669	Prefix: dc.srv.prefix(),
[13]	670	Command: irc.ERR_NOMOTD,
[55]	671	Params: []string{dc.nick, "No MOTD"},
[54]	672	})
[13]	673
[73]	674	dc.forEachUpstream(func(uc *upstreamConn) {
[30]	675	for _, ch := range uc.channels {
	676	if ch.complete {
[132]	677	dc.SendMessage(&irc.Message{
	678	Prefix: dc.prefix(),
	679	Command: "JOIN",
	680	Params: []string{dc.marshalChannel(ch.conn, ch.Name)},
	681	})
	682
[55]	683	forwardChannel(dc, ch)
[30]	684	}
	685	}
[143]	686	})
[50]	687
[143]	688	dc.forEachNetwork(func(net *network) {
[227]	689	var seqPtr *uint64
	690	if sendHistory {
	691	seq, ok := net.history[dc.clientName]
	692	if ok {
	693	seqPtr = &seq
	694	}
	695	}
[57]	696
[228]	697	consumer := net.ring.NewConsumer(seqPtr)
[227]	698	dc.ringConsumers[net] = consumer
[144]	699
[227]	700	// TODO: this means all history is lost when trying to send it while the
	701	// upstream is disconnected. We need to store history differently so that
	702	// we don't need access to upstreamConn to forward it to a downstream
	703	// client.
	704	uc := net.upstream()
	705	if uc == nil {
	706	dc.logger.Printf("ignoring messages for upstream %q: upstream is disconnected", net.Addr)
	707	return
[50]	708	}
[57]	709
[227]	710	for {
	711	msg := consumer.Peek()
	712	if msg == nil {
	713	break
[204]	714	}
	715
[227]	716	dc.sendFromUpstream(msg, uc)
	717	consumer.Consume()
	718	}
	719	})
[203]	720
[227]	721	return nil
[13]	722	}
	723
[103]	724	func (dc *downstreamConn) runUntilRegistered() error {
	725	for !dc.registered {
[212]	726	msg, err := dc.ReadMessage()
[106]	727	if err != nil {
[103]	728	return fmt.Errorf("failed to read IRC command: %v", err)
	729	}
	730
	731	err = dc.handleMessage(msg)
	732	if ircErr, ok := err.(ircError); ok {
	733	ircErr.Message.Prefix = dc.srv.prefix()
	734	dc.SendMessage(ircErr.Message)
	735	} else if err != nil {
	736	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	737	}
	738	}
	739
	740	return nil
	741	}
	742
[55]	743	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	744	switch msg.Command {
[111]	745	case "CAP":
	746	var subCmd string
	747	if err := parseMessageParams(msg, &subCmd); err != nil {
	748	return err
	749	}
	750	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	751	return err
	752	}
[107]	753	case "PING":
	754	dc.SendMessage(&irc.Message{
	755	Prefix: dc.srv.prefix(),
	756	Command: "PONG",
	757	Params: msg.Params,
	758	})
	759	return nil
[42]	760	case "USER":
[13]	761	return ircError{&irc.Message{
	762	Command: irc.ERR_ALREADYREGISTERED,
[55]	763	Params: []string{dc.nick, "You may not reregister"},
[13]	764	}}
[42]	765	case "NICK":
[90]	766	var nick string
	767	if err := parseMessageParams(msg, &nick); err != nil {
	768	return err
	769	}
	770
	771	var err error
	772	dc.forEachNetwork(func(n *network) {
	773	if err != nil {
	774	return
	775	}
	776	n.Nick = nick
	777	err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
	778	})
	779	if err != nil {
	780	return err
	781	}
	782
[73]	783	dc.forEachUpstream(func(uc *upstreamConn) {
[60]	784	uc.SendMessage(msg)
[42]	785	})
[146]	786	case "JOIN":
	787	var namesStr string
	788	if err := parseMessageParams(msg, &namesStr); err != nil {
[48]	789	return err
	790	}
	791
[146]	792	var keys []string
	793	if len(msg.Params) > 1 {
	794	keys = strings.Split(msg.Params[1], ",")
	795	}
	796
	797	for i, name := range strings.Split(namesStr, ",") {
[145]	798	uc, upstreamName, err := dc.unmarshalEntity(name)
	799	if err != nil {
[158]	800	return err
[145]	801	}
[48]	802
[146]	803	var key string
	804	if len(keys) > i {
	805	key = keys[i]
	806	}
	807
	808	params := []string{upstreamName}
	809	if key != "" {
	810	params = append(params, key)
	811	}
[145]	812	uc.SendMessage(&irc.Message{
[146]	813	Command: "JOIN",
	814	Params: params,
[145]	815	})
[89]	816
[222]	817	ch := &Channel{Name: upstreamName, Key: key}
	818	if err := uc.network.createUpdateChannel(ch); err != nil {
	819	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
[89]	820	}
	821	}
[146]	822	case "PART":
	823	var namesStr string
	824	if err := parseMessageParams(msg, &namesStr); err != nil {
	825	return err
	826	}
	827
	828	var reason string
	829	if len(msg.Params) > 1 {
	830	reason = msg.Params[1]
	831	}
	832
	833	for _, name := range strings.Split(namesStr, ",") {
	834	uc, upstreamName, err := dc.unmarshalEntity(name)
	835	if err != nil {
[158]	836	return err
[146]	837	}
	838
	839	params := []string{upstreamName}
	840	if reason != "" {
	841	params = append(params, reason)
	842	}
	843	uc.SendMessage(&irc.Message{
	844	Command: "PART",
	845	Params: params,
	846	})
	847
[222]	848	if err := uc.network.deleteChannel(upstreamName); err != nil {
	849	dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
[146]	850	}
	851	}
[159]	852	case "KICK":
	853	var channelStr, userStr string
	854	if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
	855	return err
	856	}
	857
	858	channels := strings.Split(channelStr, ",")
	859	users := strings.Split(userStr, ",")
	860
	861	var reason string
	862	if len(msg.Params) > 2 {
	863	reason = msg.Params[2]
	864	}
	865
	866	if len(channels) != 1 && len(channels) != len(users) {
	867	return ircError{&irc.Message{
	868	Command: irc.ERR_BADCHANMASK,
	869	Params: []string{dc.nick, channelStr, "Bad channel mask"},
	870	}}
	871	}
	872
	873	for i, user := range users {
	874	var channel string
	875	if len(channels) == 1 {
	876	channel = channels[0]
	877	} else {
	878	channel = channels[i]
	879	}
	880
	881	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	882	if err != nil {
	883	return err
	884	}
	885
	886	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	887	if err != nil {
	888	return err
	889	}
	890
	891	if ucChannel != ucUser {
	892	return ircError{&irc.Message{
	893	Command: irc.ERR_USERNOTINCHANNEL,
	894	Params: []string{dc.nick, user, channel, "They aren't on that channel"},
	895	}}
	896	}
	897	uc := ucChannel
	898
	899	params := []string{upstreamChannel, upstreamUser}
	900	if reason != "" {
	901	params = append(params, reason)
	902	}
	903	uc.SendMessage(&irc.Message{
	904	Command: "KICK",
	905	Params: params,
	906	})
	907	}
[69]	908	case "MODE":
[46]	909	var name string
	910	if err := parseMessageParams(msg, &name); err != nil {
	911	return err
	912	}
	913
	914	var modeStr string
	915	if len(msg.Params) > 1 {
	916	modeStr = msg.Params[1]
	917	}
	918
[139]	919	if name == dc.nick {
[46]	920	if modeStr != "" {
[73]	921	dc.forEachUpstream(func(uc *upstreamConn) {
[69]	922	uc.SendMessage(&irc.Message{
	923	Command: "MODE",
	924	Params: []string{uc.nick, modeStr},
	925	})
[46]	926	})
	927	} else {
[55]	928	dc.SendMessage(&irc.Message{
	929	Prefix: dc.srv.prefix(),
[46]	930	Command: irc.RPL_UMODEIS,
[129]	931	Params: []string{dc.nick, ""}, // TODO
[54]	932	})
[46]	933	}
[139]	934	return nil
[46]	935	}
[139]	936
	937	uc, upstreamName, err := dc.unmarshalEntity(name)
	938	if err != nil {
	939	return err
	940	}
	941
	942	if !uc.isChannel(upstreamName) {
	943	return ircError{&irc.Message{
	944	Command: irc.ERR_USERSDONTMATCH,
	945	Params: []string{dc.nick, "Cannot change mode for other users"},
	946	}}
	947	}
	948
	949	if modeStr != "" {
	950	params := []string{upstreamName, modeStr}
	951	params = append(params, msg.Params[2:]...)
	952	uc.SendMessage(&irc.Message{
	953	Command: "MODE",
	954	Params: params,
	955	})
	956	} else {
	957	ch, ok := uc.channels[upstreamName]
	958	if !ok {
	959	return ircError{&irc.Message{
	960	Command: irc.ERR_NOSUCHCHANNEL,
	961	Params: []string{dc.nick, name, "No such channel"},
	962	}}
	963	}
	964
	965	if ch.modes == nil {
	966	// we haven't received the initial RPL_CHANNELMODEIS yet
	967	// ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
	968	return nil
	969	}
	970
	971	modeStr, modeParams := ch.modes.Format()
	972	params := []string{dc.nick, name, modeStr}
	973	params = append(params, modeParams...)
	974
	975	dc.SendMessage(&irc.Message{
	976	Prefix: dc.srv.prefix(),
	977	Command: irc.RPL_CHANNELMODEIS,
	978	Params: params,
	979	})
[162]	980	if ch.creationTime != "" {
	981	dc.SendMessage(&irc.Message{
	982	Prefix: dc.srv.prefix(),
	983	Command: rpl_creationtime,
	984	Params: []string{dc.nick, name, ch.creationTime},
	985	})
	986	}
[139]	987	}
[160]	988	case "TOPIC":
	989	var channel string
	990	if err := parseMessageParams(msg, &channel); err != nil {
	991	return err
	992	}
	993
	994	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	995	if err != nil {
	996	return err
	997	}
	998
	999	if len(msg.Params) > 1 { // setting topic
	1000	topic := msg.Params[1]
	1001	uc.SendMessage(&irc.Message{
	1002	Command: "TOPIC",
	1003	Params: []string{upstreamChannel, topic},
	1004	})
	1005	} else { // getting topic
	1006	ch, ok := uc.channels[upstreamChannel]
	1007	if !ok {
	1008	return ircError{&irc.Message{
	1009	Command: irc.ERR_NOSUCHCHANNEL,
	1010	Params: []string{dc.nick, upstreamChannel, "No such channel"},
	1011	}}
	1012	}
	1013	sendTopic(dc, ch)
	1014	}
[177]	1015	case "LIST":
	1016	// TODO: support ELIST when supported by all upstreams
	1017
	1018	pl := pendingLIST{
	1019	downstreamID: dc.id,
	1020	pendingCommands: make(map[int64]*irc.Message),
	1021	}
	1022	var upstreamChannels map[int64][]string
	1023	if len(msg.Params) > 0 {
	1024	upstreamChannels = make(map[int64][]string)
	1025	channels := strings.Split(msg.Params[0], ",")
	1026	for _, channel := range channels {
	1027	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1028	if err != nil {
	1029	return err
	1030	}
	1031	upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
	1032	}
	1033	}
	1034
	1035	dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
	1036	dc.forEachUpstream(func(uc *upstreamConn) {
	1037	var params []string
	1038	if upstreamChannels != nil {
	1039	if channels, ok := upstreamChannels[uc.network.ID]; ok {
	1040	params = []string{strings.Join(channels, ",")}
	1041	} else {
	1042	return
	1043	}
	1044	}
	1045	pl.pendingCommands[uc.network.ID] = &irc.Message{
	1046	Command: "LIST",
	1047	Params: params,
	1048	}
[181]	1049	uc.trySendLIST(dc.id)
[177]	1050	})
[140]	1051	case "NAMES":
	1052	if len(msg.Params) == 0 {
	1053	dc.SendMessage(&irc.Message{
	1054	Prefix: dc.srv.prefix(),
	1055	Command: irc.RPL_ENDOFNAMES,
	1056	Params: []string{dc.nick, "*", "End of /NAMES list"},
	1057	})
	1058	return nil
	1059	}
	1060
	1061	channels := strings.Split(msg.Params[0], ",")
	1062	for _, channel := range channels {
	1063	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1064	if err != nil {
	1065	return err
	1066	}
	1067
	1068	ch, ok := uc.channels[upstreamChannel]
	1069	if ok {
	1070	sendNames(dc, ch)
	1071	} else {
	1072	// NAMES on a channel we have not joined, ask upstream
[176]	1073	uc.SendMessageLabeled(dc.id, &irc.Message{
[140]	1074	Command: "NAMES",
	1075	Params: []string{upstreamChannel},
	1076	})
	1077	}
	1078	}
[127]	1079	case "WHO":
	1080	if len(msg.Params) == 0 {
	1081	// TODO: support WHO without parameters
	1082	dc.SendMessage(&irc.Message{
	1083	Prefix: dc.srv.prefix(),
	1084	Command: irc.RPL_ENDOFWHO,
[140]	1085	Params: []string{dc.nick, "*", "End of /WHO list"},
[127]	1086	})
	1087	return nil
	1088	}
	1089
	1090	// TODO: support WHO masks
	1091	entity := msg.Params[0]
	1092
[142]	1093	if entity == dc.nick {
	1094	// TODO: support AWAY (H/G) in self WHO reply
	1095	dc.SendMessage(&irc.Message{
	1096	Prefix: dc.srv.prefix(),
	1097	Command: irc.RPL_WHOREPLY,
[184]	1098	Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
[142]	1099	})
	1100	dc.SendMessage(&irc.Message{
	1101	Prefix: dc.srv.prefix(),
	1102	Command: irc.RPL_ENDOFWHO,
	1103	Params: []string{dc.nick, dc.nick, "End of /WHO list"},
	1104	})
	1105	return nil
	1106	}
	1107
[127]	1108	uc, upstreamName, err := dc.unmarshalEntity(entity)
	1109	if err != nil {
	1110	return err
	1111	}
	1112
	1113	var params []string
	1114	if len(msg.Params) == 2 {
	1115	params = []string{upstreamName, msg.Params[1]}
	1116	} else {
	1117	params = []string{upstreamName}
	1118	}
	1119
[176]	1120	uc.SendMessageLabeled(dc.id, &irc.Message{
[127]	1121	Command: "WHO",
	1122	Params: params,
	1123	})
[128]	1124	case "WHOIS":
	1125	if len(msg.Params) == 0 {
	1126	return ircError{&irc.Message{
	1127	Command: irc.ERR_NONICKNAMEGIVEN,
	1128	Params: []string{dc.nick, "No nickname given"},
	1129	}}
	1130	}
	1131
	1132	var target, mask string
	1133	if len(msg.Params) == 1 {
	1134	target = ""
	1135	mask = msg.Params[0]
	1136	} else {
	1137	target = msg.Params[0]
	1138	mask = msg.Params[1]
	1139	}
	1140	// TODO: support multiple WHOIS users
	1141	if i := strings.IndexByte(mask, ','); i >= 0 {
	1142	mask = mask[:i]
	1143	}
	1144
[142]	1145	if mask == dc.nick {
	1146	dc.SendMessage(&irc.Message{
	1147	Prefix: dc.srv.prefix(),
	1148	Command: irc.RPL_WHOISUSER,
[184]	1149	Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
[142]	1150	})
	1151	dc.SendMessage(&irc.Message{
	1152	Prefix: dc.srv.prefix(),
	1153	Command: irc.RPL_WHOISSERVER,
	1154	Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
	1155	})
	1156	dc.SendMessage(&irc.Message{
	1157	Prefix: dc.srv.prefix(),
	1158	Command: irc.RPL_ENDOFWHOIS,
	1159	Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
	1160	})
	1161	return nil
	1162	}
	1163
[128]	1164	// TODO: support WHOIS masks
	1165	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	1166	if err != nil {
	1167	return err
	1168	}
	1169
	1170	var params []string
	1171	if target != "" {
	1172	params = []string{target, upstreamNick}
	1173	} else {
	1174	params = []string{upstreamNick}
	1175	}
	1176
[176]	1177	uc.SendMessageLabeled(dc.id, &irc.Message{
[128]	1178	Command: "WHOIS",
	1179	Params: params,
	1180	})
[58]	1181	case "PRIVMSG":
	1182	var targetsStr, text string
	1183	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1184	return err
	1185	}
	1186
	1187	for _, name := range strings.Split(targetsStr, ",") {
[117]	1188	if name == serviceNick {
	1189	handleServicePRIVMSG(dc, text)
	1190	continue
	1191	}
	1192
[127]	1193	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	1194	if err != nil {
	1195	return err
	1196	}
	1197
[95]	1198	if upstreamName == "NickServ" {
	1199	dc.handleNickServPRIVMSG(uc, text)
	1200	}
	1201
[69]	1202	uc.SendMessage(&irc.Message{
[58]	1203	Command: "PRIVMSG",
[69]	1204	Params: []string{upstreamName, text},
[60]	1205	})
[105]	1206
[113]	1207	echoMsg := &irc.Message{
	1208	Prefix: &irc.Prefix{
	1209	Name: uc.nick,
	1210	User: uc.username,
	1211	},
[114]	1212	Command: "PRIVMSG",
[113]	1213	Params: []string{upstreamName, text},
	1214	}
[105]	1215	dc.lock.Lock()
[113]	1216	dc.ourMessages[echoMsg] = struct{}{}
[105]	1217	dc.lock.Unlock()
	1218
[215]	1219	uc.appendLog(upstreamName, echoMsg)
[213]	1220
[226]	1221	uc.produce(echoMsg)
[58]	1222	}
[164]	1223	case "NOTICE":
	1224	var targetsStr, text string
	1225	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1226	return err
	1227	}
	1228
	1229	for _, name := range strings.Split(targetsStr, ",") {
	1230	uc, upstreamName, err := dc.unmarshalEntity(name)
	1231	if err != nil {
	1232	return err
	1233	}
	1234
	1235	uc.SendMessage(&irc.Message{
	1236	Command: "NOTICE",
	1237	Params: []string{upstreamName, text},
	1238	})
	1239	}
[163]	1240	case "INVITE":
	1241	var user, channel string
	1242	if err := parseMessageParams(msg, &user, &channel); err != nil {
	1243	return err
	1244	}
	1245
	1246	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	1247	if err != nil {
	1248	return err
	1249	}
	1250
	1251	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	1252	if err != nil {
	1253	return err
	1254	}
	1255
	1256	if ucChannel != ucUser {
	1257	return ircError{&irc.Message{
	1258	Command: irc.ERR_USERNOTINCHANNEL,
	1259	Params: []string{dc.nick, user, channel, "They aren't on that channel"},
	1260	}}
	1261	}
	1262	uc := ucChannel
	1263
[176]	1264	uc.SendMessageLabeled(dc.id, &irc.Message{
[163]	1265	Command: "INVITE",
	1266	Params: []string{upstreamUser, upstreamChannel},
	1267	})
[13]	1268	default:
[55]	1269	dc.logger.Printf("unhandled message: %v", msg)
[13]	1270	return newUnknownCommandError(msg.Command)
	1271	}
[42]	1272	return nil
[13]	1273	}
[95]	1274
	1275	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	1276	username, password, ok := parseNickServCredentials(text, uc.nick)
	1277	if !ok {
	1278	return
	1279	}
	1280
	1281	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	1282	n := uc.network
	1283	n.SASL.Mechanism = "PLAIN"
	1284	n.SASL.Plain.Username = username
	1285	n.SASL.Plain.Password = password
	1286	if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
	1287	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	1288	}
	1289	}
	1290
	1291	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	1292	fields := strings.Fields(text)
	1293	if len(fields) < 2 {
	1294	return "", "", false
	1295	}
	1296	cmd := strings.ToUpper(fields[0])
	1297	params := fields[1:]
	1298	switch cmd {
	1299	case "REGISTER":
	1300	username = nick
	1301	password = params[0]
	1302	case "IDENTIFY":
	1303	if len(params) == 1 {
	1304	username = nick
[182]	1305	password = params[0]
[95]	1306	} else {
	1307	username = params[0]
[182]	1308	password = params[1]
[95]	1309	}
[182]	1310	case "SET":
	1311	if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
	1312	username = nick
	1313	password = params[1]
	1314	}
[95]	1315	}
	1316	return username, password, true
	1317	}

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