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1 | #/* channel.c */ | |
2 | ||
3 | #include "channel.h" | |
4 | #include "../server/server.h" | |
5 | #include "../nick/nick.h" | |
6 | #include "../lib/irc_string.h" | |
7 | #include "../irc/irc_config.h" | |
8 | #include "../parser/parser.h" | |
9 | #include "../irc/irc.h" | |
10 | #include "../lib/base64.h" | |
11 | #include "../lib/version.h" | |
12 | #include "../core/nsmalloc.h" | |
13 | ||
14 | #include <stdio.h> | |
15 | #include <string.h> | |
16 | ||
17 | MODULE_VERSION(""); | |
18 | ||
19 | #define channelhash(x) (irc_crc32i(x)%CHANNELHASHSIZE) | |
20 | ||
21 | unsigned long nouser; | |
22 | ||
23 | const flag cmodeflags[] = { | |
24 | { 'n', CHANMODE_NOEXTMSG }, | |
25 | { 't', CHANMODE_TOPICLIMIT }, | |
26 | { 's', CHANMODE_SECRET }, | |
27 | { 'p', CHANMODE_PRIVATE }, | |
28 | { 'i', CHANMODE_INVITEONLY }, | |
29 | { 'l', CHANMODE_LIMIT }, | |
30 | { 'k', CHANMODE_KEY }, | |
31 | { 'm', CHANMODE_MODERATE }, | |
32 | { 'c', CHANMODE_NOCOLOUR }, | |
33 | { 'C', CHANMODE_NOCTCP }, | |
34 | { 'r', CHANMODE_REGONLY }, | |
35 | { 'D', CHANMODE_DELJOINS }, | |
36 | { 'u', CHANMODE_NOQUITMSG }, | |
37 | { 'N', CHANMODE_NONOTICE }, | |
38 | { 'M', CHANMODE_MODNOAUTH }, | |
39 | { 'T', CHANMODE_SINGLETARG }, | |
40 | { '\0', 0 } }; | |
41 | ||
42 | void channelstats(int hooknum, void *arg); | |
43 | void sendchanburst(int hooknum, void *arg); | |
44 | ||
45 | void _init() { | |
46 | /* Set up the nouser marker according to our own numeric */ | |
47 | nouser=(mylongnum<<18)|CU_NOUSERMASK; | |
48 | ||
49 | /* If we're connected to IRC, force a disconnect. This needs to be done | |
50 | * before we register all our hooks which would otherwise get called | |
51 | * during the disconnect. */ | |
52 | if (connected) { | |
53 | irc_send("%s SQ %s 0 :Resync [adding channel support]",mynumeric->content,myserver->content); irc_disconnected(0); | |
54 | } | |
55 | ||
56 | /* Set up our hooks */ | |
57 | registerhook(HOOK_NICK_NEWNICK,&addordelnick); | |
58 | registerhook(HOOK_NICK_LOSTNICK,&addordelnick); | |
59 | registerhook(HOOK_CORE_STATSREQUEST,&channelstats); | |
60 | registerhook(HOOK_IRC_SENDBURSTBURSTS,&sendchanburst); | |
61 | registerhook(HOOK_NICK_WHOISCHANNELS,&handlewhoischannels); | |
62 | ||
63 | registerserverhandler("B",&handleburstmsg,7); | |
64 | registerserverhandler("J",&handlejoinmsg,2); | |
65 | registerserverhandler("C",&handlecreatemsg,2); | |
66 | registerserverhandler("L",&handlepartmsg,1); | |
67 | registerserverhandler("K",&handlekickmsg,3); | |
68 | registerserverhandler("T",&handletopicmsg,3); | |
69 | registerserverhandler("M",&handlemodemsg,8); | |
70 | registerserverhandler("OM",&handlemodemsg,8); /* Treat OPMODE just like MODE */ | |
71 | registerserverhandler("CM",&handleclearmodemsg,2); | |
72 | } | |
73 | ||
74 | void _fini() { | |
75 | unsigned int i; | |
76 | struct channel *cp; | |
77 | struct chanindex *cip, *ncip; | |
78 | nick *np; | |
79 | ||
80 | deregisterserverhandler("B",&handleburstmsg); | |
81 | deregisterserverhandler("J",&handlejoinmsg); | |
82 | deregisterserverhandler("C",&handlecreatemsg); | |
83 | deregisterserverhandler("L",&handlepartmsg); | |
84 | deregisterserverhandler("K",&handlekickmsg); | |
85 | deregisterserverhandler("T",&handletopicmsg); | |
86 | deregisterserverhandler("M",&handlemodemsg); | |
87 | deregisterserverhandler("OM",&handlemodemsg); | |
88 | deregisterserverhandler("CM",&handleclearmodemsg); | |
89 | ||
90 | deregisterhook(HOOK_NICK_NEWNICK,&addordelnick); | |
91 | deregisterhook(HOOK_NICK_LOSTNICK,&addordelnick); | |
92 | deregisterhook(HOOK_CORE_STATSREQUEST,&channelstats); | |
93 | deregisterhook(HOOK_IRC_SENDBURSTBURSTS,&sendchanburst); | |
94 | deregisterhook(HOOK_NICK_WHOISCHANNELS,&handlewhoischannels); | |
95 | ||
96 | /* Free all the channels */ | |
97 | for(i=0;i<CHANNELHASHSIZE;i++) { | |
98 | for (cip=chantable[i];cip;cip=ncip) { | |
99 | ncip=cip->next; | |
100 | if ((cp=cip->channel)) | |
101 | delchannel(cp); | |
102 | } | |
103 | } | |
104 | ||
105 | /* We also need to remove the channels array from each user */ | |
106 | for (i=0;i<NICKHASHSIZE;i++) { | |
107 | for (np=nicktable[i];np;np=np->next) { | |
108 | array_free(np->channels); | |
109 | free(np->channels); | |
110 | } | |
111 | } | |
112 | ||
113 | nsfreeall(POOL_CHANNEL); | |
114 | } | |
115 | ||
116 | int addnicktochannel(channel *cp, long numeric) { | |
117 | nick *np; | |
118 | int i; | |
119 | channel **ch; | |
120 | void *args[2]; | |
121 | ||
122 | /* Add the channel to the user first, since it might fail */ | |
123 | if ((np=getnickbynumeric(numeric&CU_NUMERICMASK))==NULL) { | |
124 | Error("channel",ERR_ERROR,"Non-existent numeric %ld joined channel %s",numeric,cp->index->name->content); | |
125 | return 1; | |
126 | } | |
127 | ||
128 | if (getnumerichandlefromchanhash(cp->users,numeric)) { | |
129 | Error("channel",ERR_ERROR,"User %s joined channel %s it was already on!",np->nick,cp->index->name->content); | |
130 | return 1; | |
131 | } | |
132 | ||
133 | i=array_getfreeslot(np->channels); | |
134 | ch=(channel **)(np->channels->content); | |
135 | ch[i]=cp; | |
136 | ||
137 | /* Add the user to the channel. | |
138 | * I don't expect this while loop to go round many times | |
139 | * in the majority of cases */ | |
140 | while (addnumerictochanuserhash(cp->users,numeric)) { | |
141 | rehashchannel(cp); | |
142 | } | |
143 | ||
144 | /* Trigger the hook */ | |
145 | args[0]=(void *)cp; | |
146 | args[1]=(void *)np; | |
147 | triggerhook(HOOK_CHANNEL_NEWNICK,args); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | void delnickfromchannel(channel *cp, long numeric, int updateuser) { | |
153 | int i; | |
154 | channel **ch; | |
155 | nick *np; | |
156 | unsigned long *lp; | |
157 | int found=0; | |
158 | void *args[2]; | |
159 | ||
160 | if ((np=getnickbynumeric(numeric&CU_NUMERICMASK))==NULL) { | |
161 | Error("channel",ERR_ERROR,"Trying to remove non-existent nick %lu from channel %s",numeric,cp->index->name->content); | |
162 | return; | |
163 | } | |
164 | ||
165 | args[0]=(void *)cp; | |
166 | args[1]=(void *)np; | |
167 | ||
168 | if ((lp=getnumerichandlefromchanhash(cp->users,numeric))==NULL) { | |
169 | /* User wasn't on the channel. It's perfectly legit that this can happen. */ | |
170 | return; | |
171 | } else { | |
172 | triggerhook(HOOK_CHANNEL_LOSTNICK,args); | |
173 | *lp=nouser; | |
174 | if (--cp->users->totalusers==0) { | |
175 | /* We're deleting the channel; flag it here */ | |
176 | triggerhook(HOOK_CHANNEL_LOSTCHANNEL,cp); | |
177 | delchannel(cp); | |
178 | } | |
179 | } | |
180 | ||
181 | /* The updateuser part is optional; if the user is parting _all_ their channels | |
182 | * at once we don't bother hunting each channel down we just blat the array */ | |
183 | ||
184 | if (updateuser) { | |
185 | ch=(channel **)(np->channels->content); | |
186 | for (i=0;i<np->channels->cursi;i++) { | |
187 | if (ch[i]==cp) { | |
188 | array_delslot(np->channels,i); | |
189 | found=1; | |
190 | break; | |
191 | } | |
192 | } | |
193 | if (found==0) { | |
194 | Error("channel",ERR_ERROR,"Trying to remove nick %s from channel %s it was not on (chan not on nick)",np->nick,cp->index->name->content); | |
195 | } | |
196 | } | |
197 | } | |
198 | ||
199 | void delchannel(channel *cp) { | |
200 | chanindex *cip; | |
201 | ||
202 | /* Remove entry from index */ | |
203 | cip=cp->index; | |
204 | cip->channel=NULL; | |
205 | releasechanindex(cip); | |
206 | ||
207 | freesstring(cp->topic); | |
208 | freesstring(cp->key); | |
209 | freechanuserhash(cp->users); | |
210 | clearallbans(cp); | |
211 | freechan(cp); | |
212 | } | |
213 | ||
214 | channel *createchannel(char *name) { | |
215 | channel *cp; | |
216 | chanindex *cip; | |
217 | sstring *ssp; | |
218 | ||
219 | cip=findorcreatechanindex(name); | |
220 | ||
221 | if (cip->channel) { | |
222 | Error("channel",ERR_ERROR,"Attempting to create existing channel %s (%s).",cip->name->content,name); | |
223 | return cip->channel; | |
224 | } | |
225 | ||
226 | /* Check that chanindex record has the same capitalisation as actual channel */ | |
227 | if (strcmp(cip->name->content,name)) { | |
228 | ssp=cip->name; | |
229 | cip->name=getsstring(name,CHANNELLEN); | |
230 | freesstring(ssp); | |
231 | } | |
232 | ||
233 | cp=newchan(); | |
234 | cip->channel=cp; | |
235 | cp->index=cip; | |
236 | ||
237 | cp->timestamp=MAGIC_REMOTE_JOIN_TS; | |
238 | cp->topic=NULL; | |
239 | cp->topictime=0; | |
240 | cp->flags=0; | |
241 | cp->key=NULL; | |
242 | cp->limit=0; | |
243 | cp->bans=NULL; | |
244 | cp->users=newchanuserhash(1); | |
245 | ||
246 | return cp; | |
247 | } | |
248 | ||
249 | channel *findchannel(char *name) { | |
250 | chanindex *cip; | |
251 | ||
252 | cip=findchanindex(name); | |
253 | if (cip==NULL) { | |
254 | return NULL; | |
255 | } else { | |
256 | return cip->channel; | |
257 | } | |
258 | } | |
259 | ||
260 | void channelstats(int hooknum, void *arg) { | |
261 | long level=(long)arg; | |
262 | int i,curchain,maxchain=0,total=0,buckets=0,realchans=0; | |
263 | int users=0,slots=0; | |
264 | chanindex *cip; | |
265 | char buf[100]; | |
266 | ||
267 | for (i=0;i<CHANNELHASHSIZE;i++) { | |
268 | if (chantable[i]!=NULL) { | |
269 | buckets++; | |
270 | curchain=0; | |
271 | for (cip=chantable[i];cip;cip=cip->next) { | |
272 | total++; | |
273 | curchain++; | |
274 | if (cip->channel!=NULL) { | |
275 | realchans++; | |
276 | users+=cip->channel->users->totalusers; | |
277 | slots+=cip->channel->users->hashsize; | |
278 | } | |
279 | } | |
280 | if (curchain>maxchain) { | |
281 | maxchain=curchain; | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | if (level>5) { | |
287 | /* Full stats */ | |
288 | sprintf(buf,"Channel : %6d channels (HASH: %6d/%6d, chain %3d)",total,buckets,CHANNELHASHSIZE,maxchain); | |
289 | triggerhook(HOOK_CORE_STATSREPLY,buf); | |
290 | ||
291 | sprintf(buf,"Channel :%7d channel users, %7d slots allocated, efficiency %.1f%%",users,slots,(float)(100*users)/slots); | |
292 | triggerhook(HOOK_CORE_STATSREPLY,buf); | |
293 | } | |
294 | ||
295 | if (level>2) { | |
296 | sprintf(buf,"Channel : %6d channels formed.",realchans); | |
297 | triggerhook(HOOK_CORE_STATSREPLY,buf); | |
298 | } | |
299 | } | |
300 | ||
301 | ||
302 | /* | |
303 | * Deal with users joining the network (create and initialise their channel array) | |
304 | * or leaving the network (remove them from all channels and delete the array) | |
305 | */ | |
306 | ||
307 | void addordelnick(int hooknum, void *arg) { | |
308 | nick *np=(nick *)arg; | |
309 | channel **ch; | |
310 | int i; | |
311 | ||
312 | switch(hooknum) { | |
313 | case HOOK_NICK_NEWNICK: | |
314 | np->channels=(array *)malloc(sizeof(array)); | |
315 | array_init(np->channels,sizeof(channel **)); | |
316 | array_setlim1(np->channels,10); | |
317 | array_setlim2(np->channels,15); | |
318 | break; | |
319 | ||
320 | case HOOK_NICK_LOSTNICK: | |
321 | ch=(channel **)(np->channels->content); | |
322 | for(i=0;i<np->channels->cursi;i++) { | |
323 | delnickfromchannel(ch[i],np->numeric,0); | |
324 | } | |
325 | array_free(np->channels); | |
326 | free(np->channels); | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * Spam our local burst on connect.. | |
333 | */ | |
334 | ||
335 | void sendchanburst(int hooknum, void *arg) { | |
336 | chanindex *cip; | |
337 | channel *cp; | |
338 | chanban *ban; | |
339 | char buf[BUFSIZE]; | |
340 | char buf2[20]; | |
341 | char *banstr; | |
342 | int i; | |
343 | int j,k; | |
344 | int bufpos; | |
345 | int newmode=1; | |
346 | int newline=1; | |
347 | long modeorder[] = { 0, CUMODE_OP, CUMODE_VOICE, CUMODE_OP|CUMODE_VOICE }; | |
348 | long curmode; | |
349 | ||
350 | for (i=0;i<CHANNELHASHSIZE;i++) { | |
351 | for (cip=chantable[i];cip;cip=cip->next) { | |
352 | cp=cip->channel; | |
353 | if (cp==NULL) { | |
354 | continue; | |
355 | } | |
356 | /* Set up the burst */ | |
357 | sprintf(buf2,"%d ",cp->limit); | |
358 | bufpos=sprintf(buf,"%s B %s %lu %s %s%s%s",mynumeric->content,cip->name->content,cp->timestamp, | |
359 | printflags(cp->flags,cmodeflags),IsLimit(cp)?buf2:"", | |
360 | IsKey(cp)?cp->key->content:"",IsKey(cp)?" ":""); | |
361 | for(j=0;j<4;j++) { | |
362 | curmode=modeorder[j]; | |
363 | newmode=1; | |
364 | for (k=0;k<cp->users->hashsize;k++) { | |
365 | if (cp->users->content[k]!=nouser && ((cp->users->content[k]&(CU_MODEMASK))==curmode)) { | |
366 | /* We found a user of the correct type for this pass */ | |
367 | if (BUFSIZE-bufpos<10) { /* Out of space.. wrap up the old line and send a new one */ | |
368 | newmode=newline=1; | |
369 | irc_send("%s",buf); | |
370 | bufpos=sprintf(buf,"%s B %s %lu ",mynumeric->content,cip->name->content,cp->timestamp); | |
371 | } | |
372 | if (newmode) { | |
373 | bufpos+=sprintf(buf+bufpos,"%s%s%s%s%s",newline?"":",",longtonumeric(cp->users->content[k]&CU_NUMERICMASK,5), | |
374 | (curmode==0?"":":"),(curmode&CUMODE_OP)?"o":"",(curmode&CUMODE_VOICE)?"v":""); | |
375 | } else { | |
376 | bufpos+=sprintf(buf+bufpos,",%s",longtonumeric(cp->users->content[k]&CU_NUMERICMASK,5)); | |
377 | } | |
378 | newmode=newline=0; | |
379 | } /* if(...) */ | |
380 | } /* for (k=..) */ | |
381 | } /* for (j=..) */ | |
382 | ||
383 | /* And now the bans */ | |
384 | newline=1; | |
385 | for(ban=cp->bans;ban;ban=ban->next) { | |
386 | banstr=bantostring(ban); | |
387 | if ((BUFSIZE-bufpos)<(strlen(banstr)+10)) { /* Out of space.. wrap up the old line and send a new one */ | |
388 | newline=1; | |
389 | irc_send("%s",buf); | |
390 | bufpos=sprintf(buf,"%s B %s %lu",mynumeric->content,cip->name->content,cp->timestamp); | |
391 | } | |
392 | bufpos+=sprintf(buf+bufpos,"%s%s ",(newline?" :%":""),banstr); | |
393 | newline=0; | |
394 | } | |
395 | irc_send("%s",buf); | |
396 | } /* for(cp..) */ | |
397 | } /* for (i..) */ | |
398 | } | |
399 | ||
400 | /* | |
401 | * countuniquehosts: | |
402 | * Uses the marker on all host records to count unique hosts | |
403 | * on a channel in O(n) time (n is channel user hash size). | |
404 | */ | |
405 | ||
406 | unsigned int countuniquehosts(channel *cp) { | |
407 | unsigned int marker; | |
408 | int i; | |
409 | int count=0; | |
410 | nick *np; | |
411 | ||
412 | marker=nexthostmarker(); | |
413 | for (i=0;i<cp->users->hashsize;i++) { | |
414 | if (cp->users->content[i]==nouser) | |
415 | continue; | |
416 | ||
417 | if ((np=getnickbynumeric(cp->users->content[i]))==NULL) { | |
418 | Error("channel",ERR_ERROR,"Found unknown numeric %lu on channel %s",cp->users->content[i],cp->index->name->content); | |
419 | continue; | |
420 | } | |
421 | ||
422 | if (np->host->marker==marker) | |
423 | continue; | |
424 | ||
425 | np->host->marker=marker; | |
426 | count++; | |
427 | } | |
428 | ||
429 | return count; | |
430 | } | |
431 | ||
432 | /* | |
433 | * clean_key: returns a "cleaned" version of the key like ircu does. | |
434 | * | |
435 | * Note that s is a signed char, so we are basically allowing everything from 33-127 except : or , | |
436 | * | |
437 | * Unlike ircu we don't check against KEYLEN here, this is done elsewhere. | |
438 | */ | |
439 | void clean_key(char *key) { | |
440 | for (;*key;key++) { | |
441 | if (*key<=32 || *key==':' || *key==',') { | |
442 | *key=0; | |
443 | return; | |
444 | } | |
445 | } | |
446 | } |