1 |
/* Channel-handling routines. |
2 |
* |
3 |
* IRC Services is copyright (c) 1996-2009 Andrew Church. |
4 |
* E-mail: <achurch@achurch.org> |
5 |
* Parts written by Andrew Kempe and others. |
6 |
* This program is free but copyrighted software; see the file GPL.txt for |
7 |
* details. |
8 |
*/ |
9 |
|
10 |
#include "services.h" |
11 |
#include "modules.h" |
12 |
|
13 |
/*************************************************************************/ |
14 |
|
15 |
#define HASHFUNC(key) DEFAULT_HASHFUNC(key+1) |
16 |
#define add_channel static add_channel |
17 |
#define del_channel static del_channel |
18 |
#include "hash.h" |
19 |
DEFINE_HASH(channel, Channel, name) |
20 |
#undef add_channel |
21 |
#undef del_channel |
22 |
|
23 |
static int cb_create = -1; |
24 |
static int cb_delete = -1; |
25 |
static int cb_join = -1; |
26 |
static int cb_join_check = -1; |
27 |
static int cb_mode = -1; |
28 |
static int cb_mode_change = -1; |
29 |
static int cb_umode_change = -1; |
30 |
static int cb_topic = -1; |
31 |
|
32 |
/*************************************************************************/ |
33 |
/*************************************************************************/ |
34 |
|
35 |
int channel_init(int ac, char **av) |
36 |
{ |
37 |
cb_create = register_callback("channel create"); |
38 |
cb_delete = register_callback("channel delete"); |
39 |
cb_join = register_callback("channel JOIN"); |
40 |
cb_join_check = register_callback("channel JOIN check"); |
41 |
cb_mode = register_callback("channel MODE"); |
42 |
cb_mode_change = register_callback("channel mode change"); |
43 |
cb_umode_change = register_callback("channel umode change"); |
44 |
cb_topic = register_callback("channel TOPIC"); |
45 |
if (cb_create < 0 || cb_delete < 0 || cb_join < 0 || cb_join_check < 0 |
46 |
|| cb_mode < 0 || cb_mode_change < 0 || cb_umode_change < 0 |
47 |
|| cb_topic < 0 |
48 |
) { |
49 |
log("channel_init: register_callback() failed\n"); |
50 |
return 0; |
51 |
} |
52 |
return 1; |
53 |
} |
54 |
|
55 |
/*************************************************************************/ |
56 |
|
57 |
void channel_cleanup(void) |
58 |
{ |
59 |
Channel *c; |
60 |
|
61 |
for (c = first_channel(); c; c = next_channel()) |
62 |
del_channel(c); |
63 |
unregister_callback(cb_topic); |
64 |
unregister_callback(cb_umode_change); |
65 |
unregister_callback(cb_mode_change); |
66 |
unregister_callback(cb_mode); |
67 |
unregister_callback(cb_join_check); |
68 |
unregister_callback(cb_join); |
69 |
unregister_callback(cb_delete); |
70 |
unregister_callback(cb_create); |
71 |
} |
72 |
|
73 |
/*************************************************************************/ |
74 |
|
75 |
/* Return statistics. Pointers are assumed to be valid. */ |
76 |
|
77 |
void get_channel_stats(long *nrec, long *memuse) |
78 |
{ |
79 |
long count = 0, mem = 0; |
80 |
Channel *chan; |
81 |
struct c_userlist *cu; |
82 |
int i; |
83 |
|
84 |
for (chan = first_channel(); chan; chan = next_channel()) { |
85 |
count++; |
86 |
mem += sizeof(*chan); |
87 |
if (chan->topic) |
88 |
mem += strlen(chan->topic)+1; |
89 |
if (chan->key) |
90 |
mem += strlen(chan->key)+1; |
91 |
ARRAY_FOREACH (i, chan->bans) { |
92 |
mem += sizeof(char *); |
93 |
if (chan->bans[i]) |
94 |
mem += strlen(chan->bans[i])+1; |
95 |
} |
96 |
ARRAY_FOREACH (i, chan->excepts) { |
97 |
mem += sizeof(char *); |
98 |
if (chan->excepts[i]) |
99 |
mem += strlen(chan->excepts[i])+1; |
100 |
} |
101 |
LIST_FOREACH (cu, chan->users) |
102 |
mem += sizeof(*cu); |
103 |
} |
104 |
*nrec = count; |
105 |
*memuse = mem; |
106 |
} |
107 |
|
108 |
/*************************************************************************/ |
109 |
/*************************************************************************/ |
110 |
|
111 |
/* Add/remove a user to/from a channel, creating or deleting the channel as |
112 |
* necessary. If creating the channel, restore mode lock and topic as |
113 |
* necessary. Also check for auto-opping and auto-voicing. If a mode is |
114 |
* given, it is assumed to have been set by the remote server. |
115 |
* Returns the Channel structure for the given channel, or NULL if the user |
116 |
* was refused access to the channel (by the join check callback). |
117 |
*/ |
118 |
|
119 |
Channel *chan_adduser(User *user, const char *chan, int32 modes) |
120 |
{ |
121 |
Channel *c = get_channel(chan); |
122 |
int newchan = !c; |
123 |
struct c_userlist *u; |
124 |
|
125 |
if (call_callback_2(cb_join_check, chan, user) > 0) |
126 |
return NULL; |
127 |
if (newchan) { |
128 |
log_debug(1, "Creating channel %s", chan); |
129 |
/* Allocate pre-cleared memory */ |
130 |
c = scalloc(sizeof(Channel), 1); |
131 |
strbcpy(c->name, chan); |
132 |
c->creation_time = time(NULL); |
133 |
add_channel(c); |
134 |
call_callback_3(cb_create, c, user, modes); |
135 |
} |
136 |
u = smalloc(sizeof(struct c_userlist)); |
137 |
LIST_INSERT(u, c->users); |
138 |
u->user = user; |
139 |
u->mode = modes; |
140 |
u->flags = 0; |
141 |
call_callback_2(cb_join, c, u); |
142 |
return c; |
143 |
} |
144 |
|
145 |
|
146 |
void chan_deluser(User *user, Channel *c) |
147 |
{ |
148 |
struct c_userlist *u; |
149 |
int i; |
150 |
|
151 |
LIST_SEARCH_SCALAR(c->users, user, user, u); |
152 |
if (!u) { |
153 |
log("channel: BUG: chan_deluser() called for %s in %s but they " |
154 |
"were not found on the channel's userlist.", |
155 |
user->nick, c->name); |
156 |
return; |
157 |
} |
158 |
LIST_REMOVE(u, c->users); |
159 |
free(u); |
160 |
|
161 |
if (!c->users) { |
162 |
log_debug(1, "Deleting channel %s", c->name); |
163 |
call_callback_1(cb_delete, c); |
164 |
set_cmode(NULL, c); /* make sure nothing's left buffered */ |
165 |
free(c->topic); |
166 |
free(c->key); |
167 |
free(c->link); |
168 |
free(c->flood); |
169 |
for (i = 0; i < c->bans_count; i++) |
170 |
free(c->bans[i]); |
171 |
free(c->bans); |
172 |
for (i = 0; i < c->excepts_count; i++) |
173 |
free(c->excepts[i]); |
174 |
free(c->excepts); |
175 |
del_channel(c); |
176 |
free(c); |
177 |
} |
178 |
} |
179 |
|
180 |
/*************************************************************************/ |
181 |
|
182 |
/* Search for the given ban on the given channel, and return the index into |
183 |
* chan->bans[] if found, -1 otherwise. Nicknames are compared using |
184 |
* irc_stricmp(), usernames and hostnames using stricmp(). |
185 |
*/ |
186 |
static int find_ban(const Channel *chan, const char *ban) |
187 |
{ |
188 |
char *s, *t; |
189 |
int i; |
190 |
|
191 |
t = strchr(ban, '!'); |
192 |
i = 0; |
193 |
ARRAY_FOREACH (i, chan->bans) { |
194 |
s = strchr(chan->bans[i], '!'); |
195 |
if (s && t) { |
196 |
if (s-(chan->bans[i]) == t-ban |
197 |
&& irc_strnicmp(chan->bans[i], ban, s-(chan->bans[i])) == 0 |
198 |
&& stricmp(s+1, t+1) == 0 |
199 |
) { |
200 |
return i; |
201 |
} |
202 |
} else if (!s && !t) { |
203 |
/* Bans without '!' should be impossible; just |
204 |
* do a case-insensitive compare */ |
205 |
if (stricmp(chan->bans[i], ban) == 0) |
206 |
return i; |
207 |
} |
208 |
} |
209 |
return -1; |
210 |
} |
211 |
|
212 |
/*************************************************************************/ |
213 |
|
214 |
/* Search for the given ban (case-insensitive) on the channel; return 1 if |
215 |
* it exists, 0 if not. |
216 |
*/ |
217 |
|
218 |
int chan_has_ban(const char *chan, const char *ban) |
219 |
{ |
220 |
Channel *c = get_channel(chan); |
221 |
if (!c) |
222 |
return 0; |
223 |
return find_ban(c, ban) >= 0; |
224 |
} |
225 |
|
226 |
/*************************************************************************/ |
227 |
|
228 |
/* Handle a channel MODE command. |
229 |
* When called internally to modify channel modes, callers may assume that |
230 |
* the contents of the argument strings will not be modified. |
231 |
*/ |
232 |
|
233 |
/* Hack to allow -o+v to work without having to search the whole channel |
234 |
* user list for changed modes. */ |
235 |
#define MAX_CUMODES 16 |
236 |
static struct { |
237 |
struct c_userlist *user; |
238 |
int32 add, remove; |
239 |
} cumode_changes[MAX_CUMODES]; |
240 |
static int cumode_count = 0; |
241 |
|
242 |
static void do_cumode(const char *source, Channel *chan, int32 flag, int add, |
243 |
const char *nick); |
244 |
static void finish_cumode(const char *source, Channel *chan); |
245 |
|
246 |
void do_cmode(const char *source, int ac, char **av) |
247 |
{ |
248 |
Channel *chan; |
249 |
char *s; |
250 |
int add = 1; /* 1 if adding modes, 0 if deleting */ |
251 |
char *modestr; |
252 |
|
253 |
chan = get_channel(av[0]); |
254 |
if (!chan) { |
255 |
log_debug(1, "channel: MODE %s for nonexistent channel %s", |
256 |
merge_args(ac-1, av+1), av[0]); |
257 |
return; |
258 |
} |
259 |
if ((protocol_features & PF_MODETS_FIRST) && isdigit(av[1][0])) { |
260 |
ac--; |
261 |
av++; |
262 |
} |
263 |
modestr = av[1]; |
264 |
|
265 |
if (!NoBouncyModes) { |
266 |
/* Count identical server mode changes per second (mode bounce check)*/ |
267 |
/* Doesn't trigger on +/-[bov] or other multiply-settable modes */ |
268 |
static char multimodes[BUFSIZE]; |
269 |
if (!*multimodes) { |
270 |
int i = 0; |
271 |
i = snprintf(multimodes, sizeof(multimodes), "%s", |
272 |
chanmode_multiple); |
273 |
snprintf(multimodes+i, sizeof(multimodes)-i, "%s", |
274 |
mode_flags_to_string(MODE_ALL,MODE_CHANUSER)); |
275 |
} |
276 |
if (strchr(source, '.') && strcmp(source, ServerName) != 0 |
277 |
&& !modestr[strcspn(modestr, multimodes)] |
278 |
) { |
279 |
static char lastmodes[BUFSIZE]; |
280 |
if (time(NULL) != chan->server_modetime |
281 |
|| strcmp(modestr, lastmodes) != 0 |
282 |
) { |
283 |
chan->server_modecount = 0; |
284 |
chan->server_modetime = time(NULL); |
285 |
strbcpy(lastmodes, modestr); |
286 |
} |
287 |
chan->server_modecount++; |
288 |
} |
289 |
} |
290 |
|
291 |
s = modestr; |
292 |
ac -= 2; |
293 |
av += 2; |
294 |
cumode_count = 0; |
295 |
|
296 |
while (*s) { |
297 |
char modechar = *s++; |
298 |
int32 flag; |
299 |
int params; |
300 |
|
301 |
if (modechar == '+') { |
302 |
add = 1; |
303 |
continue; |
304 |
} else if (modechar == '-') { |
305 |
add = 0; |
306 |
continue; |
307 |
} else if (add < 0) { |
308 |
continue; |
309 |
} |
310 |
|
311 |
/* Check for it as a channel user mode */ |
312 |
|
313 |
flag = mode_char_to_flag(modechar, MODE_CHANUSER); |
314 |
if (flag) { |
315 |
if (--ac < 0) { |
316 |
log("channel: MODE %s %s: missing parameter for %c%c", |
317 |
chan->name, modestr, add ? '+' : '-', modechar); |
318 |
break; |
319 |
} |
320 |
do_cumode(source, chan, flag, add, *av++); |
321 |
continue; |
322 |
} |
323 |
|
324 |
/* Nope, must be a regular channel mode */ |
325 |
|
326 |
flag = mode_char_to_flag(modechar, MODE_CHANNEL); |
327 |
if (!flag) |
328 |
continue; |
329 |
if (flag == MODE_INVALID) |
330 |
flag = 0; |
331 |
params = mode_char_to_params(modechar, MODE_CHANNEL); |
332 |
params = (params >> (add*8)) & 0xFF; |
333 |
if (ac < params) { |
334 |
log("channel: MODE %s %s: missing parameter(s) for %c%c", |
335 |
chan->name, modestr, add ? '+' : '-', modechar); |
336 |
break; |
337 |
} |
338 |
|
339 |
if (call_callback_5(cb_mode, source, chan, modechar, add, av) <= 0) { |
340 |
|
341 |
if (add) |
342 |
chan->mode |= flag; |
343 |
else |
344 |
chan->mode &= ~flag; |
345 |
|
346 |
switch (modechar) { |
347 |
case 'k': |
348 |
free(chan->key); |
349 |
if (add) |
350 |
chan->key = sstrdup(av[0]); |
351 |
else |
352 |
chan->key = NULL; |
353 |
break; |
354 |
|
355 |
case 'l': |
356 |
if (add) |
357 |
chan->limit = atoi(av[0]); |
358 |
else |
359 |
chan->limit = 0; |
360 |
break; |
361 |
|
362 |
case 'b': { |
363 |
int i = find_ban(chan, av[0]); |
364 |
if (add) { |
365 |
if (i < 0) { /* Don't add if it already exists */ |
366 |
ARRAY_EXTEND(chan->bans); |
367 |
chan->bans[chan->bans_count-1] = sstrdup(av[0]); |
368 |
} |
369 |
} else { |
370 |
if (i >= 0) { |
371 |
free(chan->bans[i]); |
372 |
ARRAY_REMOVE(chan->bans, i); |
373 |
} else { |
374 |
log("channel: MODE %s -b %s: ban not found", |
375 |
chan->name, *av); |
376 |
} |
377 |
} |
378 |
break; |
379 |
} /* case 'b' */ |
380 |
|
381 |
} /* switch (modechar) */ |
382 |
|
383 |
} /* if (callback() <= 0) */ |
384 |
|
385 |
ac -= params; |
386 |
av += params; |
387 |
|
388 |
} /* while (*s) */ |
389 |
|
390 |
call_callback_2(cb_mode_change, source, chan); |
391 |
finish_cumode(source, chan); |
392 |
} |
393 |
|
394 |
/* Modify a user's CUMODE. */ |
395 |
static void do_cumode(const char *source, Channel *chan, int32 flag, int add, |
396 |
const char *nick) |
397 |
{ |
398 |
struct c_userlist *u; |
399 |
User *user; |
400 |
int i; |
401 |
|
402 |
user = get_user(nick); |
403 |
if (!user) { |
404 |
log_debug(1, "channel: MODE %s %c%c for nonexistent user %s", |
405 |
chan->name, add ? '+' : '-', |
406 |
mode_flag_to_char(flag, MODE_CHANUSER), nick); |
407 |
return; |
408 |
} |
409 |
LIST_SEARCH_SCALAR(chan->users, user, user, u); |
410 |
if (!u) { |
411 |
log("channel: MODE %s %c%c for user %s not on channel", |
412 |
chan->name, add ? '+' : '-', |
413 |
mode_flag_to_char(flag, MODE_CHANUSER), nick); |
414 |
return; |
415 |
} |
416 |
|
417 |
if (flag == MODE_INVALID) |
418 |
return; |
419 |
for (i = 0; i < cumode_count; i++) { |
420 |
if (cumode_changes[i].user == u) |
421 |
break; |
422 |
} |
423 |
if (i >= MAX_CUMODES) { |
424 |
finish_cumode(source, chan); |
425 |
i = cumode_count = 0; |
426 |
} |
427 |
cumode_changes[i].user = u; |
428 |
if (i >= cumode_count) { |
429 |
cumode_changes[i].add = cumode_changes[i].remove = 0; |
430 |
} |
431 |
if (add) { |
432 |
cumode_changes[i].add |= flag; |
433 |
cumode_changes[i].remove &= ~flag; |
434 |
} else { |
435 |
cumode_changes[i].remove |= flag; |
436 |
cumode_changes[i].add &= ~flag; |
437 |
} |
438 |
if (i >= cumode_count) |
439 |
cumode_count = i+1; |
440 |
} |
441 |
|
442 |
static void finish_cumode(const char *source, Channel *chan) |
443 |
{ |
444 |
int i; |
445 |
|
446 |
for (i = 0; i < cumode_count; i++) { |
447 |
struct c_userlist *u = cumode_changes[i].user; |
448 |
int32 oldmode = u->mode; |
449 |
u->mode |= cumode_changes[i].add; |
450 |
u->mode &= ~cumode_changes[i].remove; |
451 |
if (u->mode != oldmode) |
452 |
call_callback_4(cb_umode_change, source, chan, u, oldmode); |
453 |
} |
454 |
cumode_count = 0; |
455 |
} |
456 |
|
457 |
/*************************************************************************/ |
458 |
|
459 |
/* Handle a TOPIC command. */ |
460 |
|
461 |
void do_topic(const char *source, int ac, char **av) |
462 |
{ |
463 |
Channel *c = get_channel(av[0]); |
464 |
const char *topic; |
465 |
char *s; |
466 |
|
467 |
if (!c) { |
468 |
log_debug(1, "channel: TOPIC %s for nonexistent channel %s", |
469 |
merge_args(ac-1, av+1), av[0]); |
470 |
return; |
471 |
} |
472 |
s = strchr(av[1], '!'); |
473 |
if (s) |
474 |
*s = 0; |
475 |
if (ac > 3) |
476 |
topic = av[3]; |
477 |
else |
478 |
topic = ""; |
479 |
if (call_callback_4(cb_topic, c, topic, av[1], strtotime(av[2],NULL)) > 0) |
480 |
return; |
481 |
strbcpy(c->topic_setter, av[1]); |
482 |
if (c->topic) { |
483 |
free(c->topic); |
484 |
c->topic = NULL; |
485 |
} |
486 |
if (ac > 3 && *av[3]) |
487 |
c->topic = sstrdup(av[3]); |
488 |
} |
489 |
|
490 |
/*************************************************************************/ |
491 |
|
492 |
/* |
493 |
* Local variables: |
494 |
* c-file-style: "stroustrup" |
495 |
* c-file-offsets: ((case-label . *) (statement-case-intro . *)) |
496 |
* indent-tabs-mode: nil |
497 |
* End: |
498 |
* |
499 |
* vim: expandtab shiftwidth=4: |
500 |
*/ |