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source: code/trunk/downstream.go@ 107

Last change on this file since 107 was 107, checked in by contact, 5 years ago
Don't reply to PING when client is unregistered
File size: 15.2 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
[91]	4	"crypto/tls"
[13]	5	"fmt"
	6	"io"
	7	"net"
[39]	8	"strings"
[105]	9	"sync"
[91]	10	"time"
[13]	11
[85]	12	"golang.org/x/crypto/bcrypt"
[13]	13	"gopkg.in/irc.v3"
	14	)
	15
	16	type ircError struct {
	17	Message *irc.Message
	18	}
	19
[85]	20	func (err ircError) Error() string {
	21	return err.Message.String()
	22	}
	23
[13]	24	func newUnknownCommandError(cmd string) ircError {
	25	return ircError{&irc.Message{
	26	Command: irc.ERR_UNKNOWNCOMMAND,
	27	Params: []string{
	28	"*",
	29	cmd,
	30	"Unknown command",
	31	},
	32	}}
	33	}
	34
	35	func newNeedMoreParamsError(cmd string) ircError {
	36	return ircError{&irc.Message{
	37	Command: irc.ERR_NEEDMOREPARAMS,
	38	Params: []string{
	39	"*",
	40	cmd,
	41	"Not enough parameters",
	42	},
	43	}}
	44	}
	45
[85]	46	var errAuthFailed = ircError{&irc.Message{
	47	Command: irc.ERR_PASSWDMISMATCH,
	48	Params: []string{"*", "Invalid username or password"},
	49	}}
[13]	50
[104]	51	type ringMessage struct {
[69]	52	consumer *RingConsumer
	53	upstreamConn *upstreamConn
	54	}
	55
[13]	56	type downstreamConn struct {
[69]	57	net net.Conn
	58	irc *irc.Conn
	59	srv *Server
	60	logger Logger
[102]	61	outgoing chan *irc.Message
[104]	62	ringMessages chan ringMessage
[69]	63	closed chan struct{}
[22]	64
[100]	65	registered bool
	66	user *user
	67	nick string
	68	username string
	69	rawUsername string
	70	realname string
	71	password string // empty after authentication
	72	network *network // can be nil
[105]	73
	74	lock sync.Mutex
	75	ourMessages map[*irc.Message]struct{}
[13]	76	}
	77
[22]	78	func newDownstreamConn(srv Server, netConn net.Conn) downstreamConn {
[55]	79	dc := &downstreamConn{
[69]	80	net: netConn,
	81	irc: irc.NewConn(netConn),
	82	srv: srv,
	83	logger: &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())},
[102]	84	outgoing: make(chan *irc.Message, 64),
[104]	85	ringMessages: make(chan ringMessage),
[69]	86	closed: make(chan struct{}),
[105]	87	ourMessages: make(map[*irc.Message]struct{}),
[22]	88	}
[26]	89
	90	go func() {
[56]	91	if err := dc.writeMessages(); err != nil {
	92	dc.logger.Printf("failed to write message: %v", err)
[26]	93	}
[55]	94	if err := dc.net.Close(); err != nil {
	95	dc.logger.Printf("failed to close connection: %v", err)
[45]	96	} else {
[55]	97	dc.logger.Printf("connection closed")
[45]	98	}
[26]	99	}()
	100
[55]	101	return dc
[22]	102	}
	103
[55]	104	func (dc downstreamConn) prefix() irc.Prefix {
[27]	105	return &irc.Prefix{
[55]	106	Name: dc.nick,
	107	User: dc.username,
[27]	108	// TODO: fill the host?
	109	}
	110	}
	111
[69]	112	func (dc downstreamConn) marshalChannel(uc upstreamConn, name string) string {
	113	return name
	114	}
	115
[90]	116	func (dc downstreamConn) forEachNetwork(f func(network)) {
	117	if dc.network != nil {
	118	f(dc.network)
	119	} else {
	120	dc.user.forEachNetwork(f)
	121	}
	122	}
	123
[73]	124	func (dc downstreamConn) forEachUpstream(f func(upstreamConn)) {
	125	dc.user.forEachUpstream(func(uc *upstreamConn) {
[77]	126	if dc.network != nil && uc.network != dc.network {
[73]	127	return
	128	}
	129	f(uc)
	130	})
	131	}
	132
[89]	133	// upstream returns the upstream connection, if any. If there are zero or if
	134	// there are multiple upstream connections, it returns nil.
	135	func (dc downstreamConn) upstream() upstreamConn {
	136	if dc.network == nil {
	137	return nil
	138	}
	139
	140	var upstream *upstreamConn
	141	dc.forEachUpstream(func(uc *upstreamConn) {
	142	upstream = uc
	143	})
	144	return upstream
	145	}
	146
[69]	147	func (dc downstreamConn) unmarshalChannel(name string) (upstreamConn, string, error) {
[89]	148	if uc := dc.upstream(); uc != nil {
	149	return uc, name, nil
	150	}
	151
[73]	152	// TODO: extract network name from channel name if dc.upstream == nil
	153	var channel *upstreamChannel
	154	var err error
	155	dc.forEachUpstream(func(uc *upstreamConn) {
	156	if err != nil {
	157	return
	158	}
	159	if ch, ok := uc.channels[name]; ok {
	160	if channel != nil {
	161	err = fmt.Errorf("ambiguous channel name %q", name)
	162	} else {
	163	channel = ch
	164	}
	165	}
	166	})
	167	if channel == nil {
	168	return nil, "", ircError{&irc.Message{
	169	Command: irc.ERR_NOSUCHCHANNEL,
	170	Params: []string{name, "No such channel"},
	171	}}
[69]	172	}
[73]	173	return channel.conn, channel.Name, nil
[69]	174	}
	175
	176	func (dc downstreamConn) marshalNick(uc upstreamConn, nick string) string {
	177	if nick == uc.nick {
	178	return dc.nick
	179	}
	180	return nick
	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	}
	187	return prefix
	188	}
	189
[57]	190	func (dc *downstreamConn) isClosed() bool {
	191	select {
	192	case <-dc.closed:
	193	return true
	194	default:
	195	return false
	196	}
	197	}
	198
[103]	199	func (dc *downstreamConn) readMessages(ch chan<- downstreamIncomingMessage) error {
[55]	200	dc.logger.Printf("new connection")
[22]	201
	202	for {
[55]	203	msg, err := dc.irc.ReadMessage()
[22]	204	if err == io.EOF {
	205	break
	206	} else if err != nil {
	207	return fmt.Errorf("failed to read IRC command: %v", err)
	208	}
	209
[64]	210	if dc.srv.Debug {
	211	dc.logger.Printf("received: %v", msg)
	212	}
	213
[103]	214	ch <- downstreamIncomingMessage{msg, dc}
[22]	215	}
	216
[45]	217	return nil
[22]	218	}
	219
[56]	220	func (dc *downstreamConn) writeMessages() error {
[57]	221	for {
	222	var err error
	223	var closed bool
	224	select {
[102]	225	case msg := <-dc.outgoing:
[64]	226	if dc.srv.Debug {
	227	dc.logger.Printf("sent: %v", msg)
	228	}
[57]	229	err = dc.irc.WriteMessage(msg)
[104]	230	case ringMessage := <-dc.ringMessages:
	231	consumer, uc := ringMessage.consumer, ringMessage.upstreamConn
[57]	232	for {
	233	msg := consumer.Peek()
	234	if msg == nil {
	235	break
	236	}
[105]	237
	238	dc.lock.Lock()
	239	_, ours := dc.ourMessages[msg]
	240	delete(dc.ourMessages, msg)
	241	dc.lock.Unlock()
	242	if ours {
	243	// The message comes from our connection, don't echo it
	244	// back
	245	continue
	246	}
	247
[69]	248	msg = msg.Copy()
	249	switch msg.Command {
	250	case "PRIVMSG":
	251	// TODO: detect whether it's a user or a channel
	252	msg.Params[0] = dc.marshalChannel(uc, msg.Params[0])
	253	default:
	254	panic("expected to consume a PRIVMSG message")
	255	}
[64]	256	if dc.srv.Debug {
	257	dc.logger.Printf("sent: %v", msg)
	258	}
[57]	259	err = dc.irc.WriteMessage(msg)
	260	if err != nil {
	261	break
	262	}
	263	consumer.Consume()
	264	}
	265	case <-dc.closed:
	266	closed = true
	267	}
	268	if err != nil {
[56]	269	return err
	270	}
[57]	271	if closed {
	272	break
	273	}
[56]	274	}
	275	return nil
	276	}
	277
[55]	278	func (dc *downstreamConn) Close() error {
[57]	279	if dc.isClosed() {
[26]	280	return fmt.Errorf("downstream connection already closed")
	281	}
[40]	282
[55]	283	if u := dc.user; u != nil {
[40]	284	u.lock.Lock()
	285	for i := range u.downstreamConns {
[55]	286	if u.downstreamConns[i] == dc {
[40]	287	u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
[63]	288	break
[40]	289	}
	290	}
	291	u.lock.Unlock()
[13]	292	}
[40]	293
[57]	294	close(dc.closed)
[45]	295	return nil
[13]	296	}
	297
[55]	298	func (dc downstreamConn) SendMessage(msg irc.Message) {
[102]	299	dc.outgoing <- msg
[54]	300	}
	301
[55]	302	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	303	switch msg.Command {
[28]	304	case "QUIT":
[55]	305	return dc.Close()
[13]	306	default:
[55]	307	if dc.registered {
	308	return dc.handleMessageRegistered(msg)
[13]	309	} else {
[55]	310	return dc.handleMessageUnregistered(msg)
[13]	311	}
	312	}
	313	}
	314
[55]	315	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	316	switch msg.Command {
	317	case "NICK":
[55]	318	if err := parseMessageParams(msg, &dc.nick); err != nil {
[43]	319	return err
[13]	320	}
	321	case "USER":
[43]	322	var username string
[55]	323	if err := parseMessageParams(msg, &username, nil, nil, &dc.realname); err != nil {
[43]	324	return err
[13]	325	}
[100]	326	dc.rawUsername = username
[85]	327	case "PASS":
	328	if err := parseMessageParams(msg, &dc.password); err != nil {
	329	return err
	330	}
[13]	331	default:
[55]	332	dc.logger.Printf("unhandled message: %v", msg)
[13]	333	return newUnknownCommandError(msg.Command)
	334	}
[100]	335	if dc.rawUsername != "" && dc.nick != "" {
[55]	336	return dc.register()
[13]	337	}
	338	return nil
	339	}
	340
[91]	341	func sanityCheckServer(addr string) error {
	342	dialer := net.Dialer{Timeout: 30 * time.Second}
	343	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	344	if err != nil {
	345	return err
	346	}
	347	return conn.Close()
	348	}
	349
[55]	350	func (dc *downstreamConn) register() error {
[100]	351	username := dc.rawUsername
[77]	352	var networkName string
[73]	353	if i := strings.LastIndexAny(username, "/@"); i >= 0 {
[77]	354	networkName = username[i+1:]
[73]	355	}
	356	if i := strings.IndexAny(username, "/@"); i >= 0 {
	357	username = username[:i]
	358	}
[100]	359	dc.username = "~" + username
[73]	360
[85]	361	password := dc.password
	362	dc.password = ""
	363
[73]	364	u := dc.srv.getUser(username)
[38]	365	if u == nil {
[85]	366	dc.logger.Printf("failed authentication for %q: unknown username", username)
	367	return errAuthFailed
[37]	368	}
	369
[85]	370	err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
	371	if err != nil {
	372	dc.logger.Printf("failed authentication for %q: %v", username, err)
	373	return errAuthFailed
	374	}
	375
[88]	376	var network *network
[77]	377	if networkName != "" {
[88]	378	network = u.getNetwork(networkName)
	379	if network == nil {
[91]	380	addr := networkName
	381	if !strings.ContainsRune(addr, ':') {
	382	addr = addr + ":6697"
	383	}
	384
[95]	385	dc.logger.Printf("trying to connect to new network %q", addr)
[91]	386	if err := sanityCheckServer(addr); err != nil {
	387	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	388	return ircError{&irc.Message{
	389	Command: irc.ERR_PASSWDMISMATCH,
	390	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", networkName)},
	391	}}
	392	}
	393
[95]	394	dc.logger.Printf("auto-saving network %q", networkName)
[91]	395	network, err = u.createNetwork(networkName, dc.nick)
	396	if err != nil {
	397	return err
	398	}
[73]	399	}
	400	}
	401
[55]	402	dc.registered = true
	403	dc.user = u
[88]	404	dc.network = network
[13]	405
[40]	406	u.lock.Lock()
[57]	407	firstDownstream := len(u.downstreamConns) == 0
[55]	408	u.downstreamConns = append(u.downstreamConns, dc)
[40]	409	u.lock.Unlock()
	410
[55]	411	dc.SendMessage(&irc.Message{
	412	Prefix: dc.srv.prefix(),
[13]	413	Command: irc.RPL_WELCOME,
[98]	414	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	415	})
[55]	416	dc.SendMessage(&irc.Message{
	417	Prefix: dc.srv.prefix(),
[13]	418	Command: irc.RPL_YOURHOST,
[55]	419	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	420	})
[55]	421	dc.SendMessage(&irc.Message{
	422	Prefix: dc.srv.prefix(),
[13]	423	Command: irc.RPL_CREATED,
[55]	424	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	425	})
[55]	426	dc.SendMessage(&irc.Message{
	427	Prefix: dc.srv.prefix(),
[13]	428	Command: irc.RPL_MYINFO,
[98]	429	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	430	})
[93]	431	// TODO: RPL_ISUPPORT
[55]	432	dc.SendMessage(&irc.Message{
	433	Prefix: dc.srv.prefix(),
[13]	434	Command: irc.ERR_NOMOTD,
[55]	435	Params: []string{dc.nick, "No MOTD"},
[54]	436	})
[13]	437
[73]	438	dc.forEachUpstream(func(uc *upstreamConn) {
[30]	439	for _, ch := range uc.channels {
	440	if ch.complete {
[55]	441	forwardChannel(dc, ch)
[30]	442	}
	443	}
[50]	444
[73]	445	historyName := dc.username
[57]	446
	447	var seqPtr *uint64
	448	if firstDownstream {
	449	seq, ok := uc.history[historyName]
	450	if ok {
	451	seqPtr = &seq
[50]	452	}
	453	}
[57]	454
[59]	455	consumer, ch := uc.ring.NewConsumer(seqPtr)
[57]	456	go func() {
	457	for {
	458	var closed bool
	459	select {
	460	case <-ch:
[104]	461	dc.ringMessages <- ringMessage{consumer, uc}
[57]	462	case <-dc.closed:
	463	closed = true
	464	}
	465	if closed {
	466	break
	467	}
	468	}
	469
	470	seq := consumer.Close()
	471
	472	dc.user.lock.Lock()
	473	lastDownstream := len(dc.user.downstreamConns) == 0
	474	dc.user.lock.Unlock()
	475
	476	if lastDownstream {
	477	uc.history[historyName] = seq
	478	}
	479	}()
[39]	480	})
[50]	481
[13]	482	return nil
	483	}
	484
[103]	485	func (dc *downstreamConn) runUntilRegistered() error {
	486	for !dc.registered {
	487	msg, err := dc.irc.ReadMessage()
[106]	488	if err != nil {
[103]	489	return fmt.Errorf("failed to read IRC command: %v", err)
	490	}
	491
	492	err = dc.handleMessage(msg)
	493	if ircErr, ok := err.(ircError); ok {
	494	ircErr.Message.Prefix = dc.srv.prefix()
	495	dc.SendMessage(ircErr.Message)
	496	} else if err != nil {
	497	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	498	}
	499	}
	500
	501	return nil
	502	}
	503
[55]	504	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	505	switch msg.Command {
[107]	506	case "PING":
	507	dc.SendMessage(&irc.Message{
	508	Prefix: dc.srv.prefix(),
	509	Command: "PONG",
	510	Params: msg.Params,
	511	})
	512	return nil
[42]	513	case "USER":
[13]	514	return ircError{&irc.Message{
	515	Command: irc.ERR_ALREADYREGISTERED,
[55]	516	Params: []string{dc.nick, "You may not reregister"},
[13]	517	}}
[42]	518	case "NICK":
[90]	519	var nick string
	520	if err := parseMessageParams(msg, &nick); err != nil {
	521	return err
	522	}
	523
	524	var err error
	525	dc.forEachNetwork(func(n *network) {
	526	if err != nil {
	527	return
	528	}
	529	n.Nick = nick
	530	err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
	531	})
	532	if err != nil {
	533	return err
	534	}
	535
[73]	536	dc.forEachUpstream(func(uc *upstreamConn) {
[60]	537	uc.SendMessage(msg)
[42]	538	})
[69]	539	case "JOIN", "PART":
[48]	540	var name string
	541	if err := parseMessageParams(msg, &name); err != nil {
	542	return err
	543	}
	544
[69]	545	uc, upstreamName, err := dc.unmarshalChannel(name)
	546	if err != nil {
	547	return ircError{&irc.Message{
	548	Command: irc.ERR_NOSUCHCHANNEL,
	549	Params: []string{name, err.Error()},
	550	}}
[48]	551	}
	552
[69]	553	uc.SendMessage(&irc.Message{
	554	Command: msg.Command,
	555	Params: []string{upstreamName},
	556	})
[89]	557
	558	switch msg.Command {
	559	case "JOIN":
	560	err := dc.srv.db.StoreChannel(uc.network.ID, &Channel{
	561	Name: upstreamName,
	562	})
	563	if err != nil {
	564	dc.logger.Printf("failed to create channel %q in DB: %v", upstreamName, err)
	565	}
	566	case "PART":
	567	if err := dc.srv.db.DeleteChannel(uc.network.ID, upstreamName); err != nil {
	568	dc.logger.Printf("failed to delete channel %q in DB: %v", upstreamName, err)
	569	}
	570	}
[69]	571	case "MODE":
	572	if msg.Prefix == nil {
	573	return fmt.Errorf("missing prefix")
[49]	574	}
	575
[46]	576	var name string
	577	if err := parseMessageParams(msg, &name); err != nil {
	578	return err
	579	}
	580
	581	var modeStr string
	582	if len(msg.Params) > 1 {
	583	modeStr = msg.Params[1]
	584	}
	585
	586	if msg.Prefix.Name != name {
[69]	587	uc, upstreamName, err := dc.unmarshalChannel(name)
[46]	588	if err != nil {
	589	return err
	590	}
	591
	592	if modeStr != "" {
[69]	593	uc.SendMessage(&irc.Message{
	594	Command: "MODE",
	595	Params: []string{upstreamName, modeStr},
	596	})
[46]	597	} else {
[69]	598	ch, ok := uc.channels[upstreamName]
	599	if !ok {
	600	return ircError{&irc.Message{
	601	Command: irc.ERR_NOSUCHCHANNEL,
	602	Params: []string{name, "No such channel"},
	603	}}
	604	}
	605
[55]	606	dc.SendMessage(&irc.Message{
	607	Prefix: dc.srv.prefix(),
[46]	608	Command: irc.RPL_CHANNELMODEIS,
[69]	609	Params: []string{name, string(ch.modes)},
[54]	610	})
[46]	611	}
	612	} else {
[55]	613	if name != dc.nick {
[46]	614	return ircError{&irc.Message{
	615	Command: irc.ERR_USERSDONTMATCH,
[55]	616	Params: []string{dc.nick, "Cannot change mode for other users"},
[46]	617	}}
	618	}
	619
	620	if modeStr != "" {
[73]	621	dc.forEachUpstream(func(uc *upstreamConn) {
[69]	622	uc.SendMessage(&irc.Message{
	623	Command: "MODE",
	624	Params: []string{uc.nick, modeStr},
	625	})
[46]	626	})
	627	} else {
[55]	628	dc.SendMessage(&irc.Message{
	629	Prefix: dc.srv.prefix(),
[46]	630	Command: irc.RPL_UMODEIS,
	631	Params: []string{""}, // TODO
[54]	632	})
[46]	633	}
	634	}
[58]	635	case "PRIVMSG":
	636	var targetsStr, text string
	637	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	638	return err
	639	}
	640
	641	for _, name := range strings.Split(targetsStr, ",") {
[69]	642	uc, upstreamName, err := dc.unmarshalChannel(name)
[58]	643	if err != nil {
	644	return err
	645	}
	646
[95]	647	if upstreamName == "NickServ" {
	648	dc.handleNickServPRIVMSG(uc, text)
	649	}
	650
[69]	651	uc.SendMessage(&irc.Message{
[58]	652	Command: "PRIVMSG",
[69]	653	Params: []string{upstreamName, text},
[60]	654	})
[105]	655
	656	dc.lock.Lock()
	657	dc.ourMessages[msg] = struct{}{}
	658	dc.lock.Unlock()
	659
	660	uc.ring.Produce(msg)
[58]	661	}
[13]	662	default:
[55]	663	dc.logger.Printf("unhandled message: %v", msg)
[13]	664	return newUnknownCommandError(msg.Command)
	665	}
[42]	666	return nil
[13]	667	}
[95]	668
	669	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	670	username, password, ok := parseNickServCredentials(text, uc.nick)
	671	if !ok {
	672	return
	673	}
	674
	675	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	676	n := uc.network
	677	n.SASL.Mechanism = "PLAIN"
	678	n.SASL.Plain.Username = username
	679	n.SASL.Plain.Password = password
	680	if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
	681	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	682	}
	683	}
	684
	685	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	686	fields := strings.Fields(text)
	687	if len(fields) < 2 {
	688	return "", "", false
	689	}
	690	cmd := strings.ToUpper(fields[0])
	691	params := fields[1:]
	692	switch cmd {
	693	case "REGISTER":
	694	username = nick
	695	password = params[0]
	696	case "IDENTIFY":
	697	if len(params) == 1 {
	698	username = nick
	699	} else {
	700	username = params[0]
	701	}
	702	password = params[1]
	703	}
	704	return username, password, true
	705	}

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