source: code/trunk/upstream.go@ 66

Last change on this file since 66 was 66, checked in by contact, 5 years ago

Properly handle PING messages
File size: 8.4 KB
Line 
1package jounce
2
3import (
4 "crypto/tls"
5 "fmt"
6 "io"
7 "net"
8 "strconv"
9 "strings"
10 "time"
11
12 "gopkg.in/irc.v3"
13)
14
15type upstreamChannel struct {
16 Name string
17 conn *upstreamConn
18 Topic string
19 TopicWho string
20 TopicTime time.Time
21 Status channelStatus
22 modes modeSet
23 Members map[string]membership
24 complete bool
25}
26
27type upstreamConn struct {
28 upstream *Upstream
29 logger Logger
30 net net.Conn
31 irc *irc.Conn
32 srv *Server
33 user *user
34 messages chan<- *irc.Message
35 ring *Ring
36
37 serverName string
38 availableUserModes string
39 availableChannelModes string
40 channelModesWithParam string
41
42 registered bool
43 nick string
44 closed bool
45 modes modeSet
46 channels map[string]*upstreamChannel
47 history map[string]uint64
48}
49
50func connectToUpstream(u *user, upstream *Upstream) (*upstreamConn, error) {
51 logger := &prefixLogger{u.srv.Logger, fmt.Sprintf("upstream %q: ", upstream.Addr)}
52 logger.Printf("connecting to server")
53
54 netConn, err := tls.Dial("tcp", upstream.Addr, nil)
55 if err != nil {
56 return nil, fmt.Errorf("failed to dial %q: %v", upstream.Addr, err)
57 }
58
59 msgs := make(chan *irc.Message, 64)
60 uc := &upstreamConn{
61 upstream: upstream,
62 logger: logger,
63 net: netConn,
64 irc: irc.NewConn(netConn),
65 srv: u.srv,
66 user: u,
67 messages: msgs,
68 ring: NewRing(u.srv.RingCap),
69 channels: make(map[string]*upstreamChannel),
70 history: make(map[string]uint64),
71 }
72
73 go func() {
74 for msg := range msgs {
75 if uc.srv.Debug {
76 uc.logger.Printf("sent: %v", msg)
77 }
78 if err := uc.irc.WriteMessage(msg); err != nil {
79 uc.logger.Printf("failed to write message: %v", err)
80 }
81 }
82 if err := uc.net.Close(); err != nil {
83 uc.logger.Printf("failed to close connection: %v", err)
84 } else {
85 uc.logger.Printf("connection closed")
86 }
87 }()
88
89 return uc, nil
90}
91
92func (uc *upstreamConn) Close() error {
93 if uc.closed {
94 return fmt.Errorf("upstream connection already closed")
95 }
96 close(uc.messages)
97 uc.closed = true
98 return nil
99}
100
101func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
102 ch, ok := uc.channels[name]
103 if !ok {
104 return nil, fmt.Errorf("unknown channel %q", name)
105 }
106 return ch, nil
107}
108
109func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
110 switch msg.Command {
111 case "PING":
112 var from, to string
113 if len(msg.Params) >= 1 {
114 from = msg.Params[0]
115 }
116 if len(msg.Params) >= 2 {
117 to = msg.Params[1]
118 }
119
120 if to != "" && to != uc.srv.Hostname {
121 return fmt.Errorf("invalid PING destination %q", to)
122 }
123
124 params := []string{uc.srv.Hostname}
125 if from != "" {
126 params = append(params, from)
127 }
128 uc.SendMessage(&irc.Message{
129 Command: "PONG",
130 Params: params,
131 })
132 return nil
133 case "MODE":
134 var name, modeStr string
135 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
136 return err
137 }
138
139 if name == msg.Prefix.Name { // user mode change
140 if name != uc.nick {
141 return fmt.Errorf("received MODE message for unknow nick %q", name)
142 }
143 return uc.modes.Apply(modeStr)
144 } else { // channel mode change
145 ch, err := uc.getChannel(name)
146 if err != nil {
147 return err
148 }
149 if err := ch.modes.Apply(modeStr); err != nil {
150 return err
151 }
152 }
153
154 uc.user.forEachDownstream(func(dc *downstreamConn) {
155 dc.SendMessage(msg)
156 })
157 case "NOTICE":
158 uc.logger.Print(msg)
159 case irc.RPL_WELCOME:
160 uc.registered = true
161 uc.logger.Printf("connection registered")
162
163 for _, ch := range uc.upstream.Channels {
164 uc.SendMessage(&irc.Message{
165 Command: "JOIN",
166 Params: []string{ch},
167 })
168 }
169 case irc.RPL_MYINFO:
170 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, &uc.availableChannelModes); err != nil {
171 return err
172 }
173 if len(msg.Params) > 5 {
174 uc.channelModesWithParam = msg.Params[5]
175 }
176 case "NICK":
177 var newNick string
178 if err := parseMessageParams(msg, &newNick); err != nil {
179 return err
180 }
181
182 if msg.Prefix.Name == uc.nick {
183 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
184 uc.nick = newNick
185 }
186
187 for _, ch := range uc.channels {
188 if membership, ok := ch.Members[msg.Prefix.Name]; ok {
189 delete(ch.Members, msg.Prefix.Name)
190 ch.Members[newNick] = membership
191 }
192 }
193
194 uc.user.forEachDownstream(func(dc *downstreamConn) {
195 dc.SendMessage(msg)
196 })
197 case "JOIN":
198 var channels string
199 if err := parseMessageParams(msg, &channels); err != nil {
200 return err
201 }
202
203 for _, ch := range strings.Split(channels, ",") {
204 if msg.Prefix.Name == uc.nick {
205 uc.logger.Printf("joined channel %q", ch)
206 uc.channels[ch] = &upstreamChannel{
207 Name: ch,
208 conn: uc,
209 Members: make(map[string]membership),
210 }
211 } else {
212 ch, err := uc.getChannel(ch)
213 if err != nil {
214 return err
215 }
216 ch.Members[msg.Prefix.Name] = 0
217 }
218 }
219
220 uc.user.forEachDownstream(func(dc *downstreamConn) {
221 dc.SendMessage(msg)
222 })
223 case "PART":
224 var channels string
225 if err := parseMessageParams(msg, &channels); err != nil {
226 return err
227 }
228
229 for _, ch := range strings.Split(channels, ",") {
230 if msg.Prefix.Name == uc.nick {
231 uc.logger.Printf("parted channel %q", ch)
232 delete(uc.channels, ch)
233 } else {
234 ch, err := uc.getChannel(ch)
235 if err != nil {
236 return err
237 }
238 delete(ch.Members, msg.Prefix.Name)
239 }
240 }
241
242 uc.user.forEachDownstream(func(dc *downstreamConn) {
243 dc.SendMessage(msg)
244 })
245 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
246 var name, topic string
247 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
248 return err
249 }
250 ch, err := uc.getChannel(name)
251 if err != nil {
252 return err
253 }
254 if msg.Command == irc.RPL_TOPIC {
255 ch.Topic = topic
256 } else {
257 ch.Topic = ""
258 }
259 case "TOPIC":
260 var name string
261 if err := parseMessageParams(msg, nil, &name); err != nil {
262 return err
263 }
264 ch, err := uc.getChannel(name)
265 if err != nil {
266 return err
267 }
268 if len(msg.Params) > 1 {
269 ch.Topic = msg.Params[1]
270 } else {
271 ch.Topic = ""
272 }
273 case rpl_topicwhotime:
274 var name, who, timeStr string
275 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
276 return err
277 }
278 ch, err := uc.getChannel(name)
279 if err != nil {
280 return err
281 }
282 ch.TopicWho = who
283 sec, err := strconv.ParseInt(timeStr, 10, 64)
284 if err != nil {
285 return fmt.Errorf("failed to parse topic time: %v", err)
286 }
287 ch.TopicTime = time.Unix(sec, 0)
288 case irc.RPL_NAMREPLY:
289 var name, statusStr, members string
290 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
291 return err
292 }
293 ch, err := uc.getChannel(name)
294 if err != nil {
295 return err
296 }
297
298 status, err := parseChannelStatus(statusStr)
299 if err != nil {
300 return err
301 }
302 ch.Status = status
303
304 for _, s := range strings.Split(members, " ") {
305 membership, nick := parseMembershipPrefix(s)
306 ch.Members[nick] = membership
307 }
308 case irc.RPL_ENDOFNAMES:
309 var name string
310 if err := parseMessageParams(msg, nil, &name); err != nil {
311 return err
312 }
313 ch, err := uc.getChannel(name)
314 if err != nil {
315 return err
316 }
317
318 if ch.complete {
319 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
320 }
321 ch.complete = true
322
323 uc.user.forEachDownstream(func(dc *downstreamConn) {
324 forwardChannel(dc, ch)
325 })
326 case "PRIVMSG":
327 uc.ring.Produce(msg)
328 case irc.RPL_YOURHOST, irc.RPL_CREATED:
329 // Ignore
330 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
331 // Ignore
332 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
333 // Ignore
334 case rpl_localusers, rpl_globalusers:
335 // Ignore
336 case irc.RPL_STATSVLINE, irc.RPL_STATSPING, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
337 // Ignore
338 default:
339 uc.logger.Printf("unhandled upstream message: %v", msg)
340 }
341 return nil
342}
343
344func (uc *upstreamConn) register() {
345 uc.nick = uc.upstream.Nick
346 uc.SendMessage(&irc.Message{
347 Command: "NICK",
348 Params: []string{uc.upstream.Nick},
349 })
350 uc.SendMessage(&irc.Message{
351 Command: "USER",
352 Params: []string{uc.upstream.Username, "0", "*", uc.upstream.Realname},
353 })
354}
355
356func (uc *upstreamConn) readMessages() error {
357 for {
358 msg, err := uc.irc.ReadMessage()
359 if err == io.EOF {
360 break
361 } else if err != nil {
362 return fmt.Errorf("failed to read IRC command: %v", err)
363 }
364
365 if uc.srv.Debug {
366 uc.logger.Printf("received: %v", msg)
367 }
368
369 if err := uc.handleMessage(msg); err != nil {
370 uc.logger.Printf("failed to handle message %q: %v", msg, err)
371 }
372 }
373
374 return nil
375}
376
377func (uc *upstreamConn) SendMessage(msg *irc.Message) {
378 uc.messages <- msg
379}
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