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root/svn/ircd-hybrid/modules/core/m_join.c
Revision: 885
Committed: Wed Oct 31 18:09:24 2007 UTC (16 years, 5 months ago) by michael
Content type: text/x-csrc
Original Path: ircd-hybrid-7.2/modules/core/m_join.c
File size: 18706 byte(s)
Log Message:
- Removed LazyLinks in 7.2 to stop people from asking why we keep
  broken code for half a decade. LL will be implemented in a smarter
  fashion in due time

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * m_join.c: Joins a channel.
4 *
5 * Copyright (C) 2002 by the past and present ircd coders, and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * $Id$
23 */
24
25 #include "stdinc.h"
26 #include "tools.h"
27 #include "handlers.h"
28 #include "channel.h"
29 #include "channel_mode.h"
30 #include "client.h"
31 #include "common.h" /* bleah */
32 #include "hash.h"
33 #include "irc_string.h"
34 #include "sprintf_irc.h"
35 #include "ircd.h"
36 #include "list.h"
37 #include "numeric.h"
38 #include "send.h"
39 #include "s_serv.h"
40 #include "s_conf.h"
41 #include "msg.h"
42 #include "parse.h"
43 #include "modules.h"
44
45
46 static void m_join(struct Client *, struct Client *, int, char **);
47 static void ms_join(struct Client *, struct Client *, int, char **);
48 static void do_join_0(struct Client *client_p, struct Client *source_p);
49
50 static void set_final_mode(struct Mode *, struct Mode *);
51 static void remove_our_modes(struct Channel *, struct Client *);
52 static void remove_a_mode(struct Channel *, struct Client *, int, char);
53
54 static char modebuf[MODEBUFLEN];
55 static char parabuf[MODEBUFLEN];
56 static char sendbuf[MODEBUFLEN];
57 static char *mbuf;
58
59 struct Message join_msgtab = {
60 "JOIN", 0, 0, 2, 0, MFLG_SLOW, 0,
61 {m_unregistered, m_join, ms_join, m_ignore, m_join, m_ignore}
62 };
63
64 #ifndef STATIC_MODULES
65 void
66 _modinit(void)
67 {
68 mod_add_cmd(&join_msgtab);
69 }
70
71 void
72 _moddeinit(void)
73 {
74 mod_del_cmd(&join_msgtab);
75 }
76
77 const char *_version = "$Revision$";
78 #endif
79
80 /* last0() stolen from ircu */
81 static char *
82 last0(struct Client *client_p, struct Client *source_p, char *chanlist)
83 {
84 char *p;
85 int join0 = 0;
86
87 for (p = chanlist; *p; ++p) /* find last "JOIN 0" */
88 {
89 if (*p == '0' && (*(p + 1) == ',' || *(p + 1) == '\0'))
90 {
91 if ((*p + 1) == ',')
92 ++p;
93
94 chanlist = p + 1;
95 join0 = 1;
96 }
97 else
98 {
99 while (*p != ',' && *p != '\0') /* skip past channel name */
100 ++p;
101
102 if (*p == '\0') /* hit the end */
103 break;
104 }
105 }
106
107 if (join0)
108 do_join_0(client_p, source_p);
109
110 return chanlist;
111 }
112
113 /* m_join()
114 * parv[0] = sender prefix
115 * parv[1] = channel
116 * parv[2] = channel password (key)
117 */
118 static void
119 m_join(struct Client *client_p, struct Client *source_p,
120 int parc, char *parv[])
121 {
122 char *p = NULL;
123 char *key_list = NULL;
124 char *chan_list = NULL;
125 char *chan = NULL;
126 struct Channel *chptr = NULL;
127 int i = 0;
128 unsigned int flags = 0;
129
130 if (EmptyString(parv[1]))
131 {
132 sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
133 me.name, source_p->name, "JOIN");
134 return;
135 }
136
137 assert(client_p == source_p);
138
139 key_list = parv[2];
140 chan_list = last0(client_p, source_p, parv[1]);
141
142 for (chan = strtoken(&p, chan_list, ","); chan;
143 chan = strtoken(&p, NULL, ","))
144 {
145 char *key = NULL;
146
147 /* If we have any more keys, take the first for this channel. */
148 if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
149 *key_list++ = '\0';
150
151 /* Empty keys are the same as no keys. */
152 if (key && *key == '\0')
153 key = NULL;
154
155 if (!check_channel_name(chan, 1))
156 {
157 sendto_one(source_p, form_str(ERR_BADCHANNAME),
158 me.name, source_p->name, chan);
159 continue;
160 }
161
162 if (ConfigChannel.disable_local_channels && (*chan == '&'))
163 {
164 sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
165 me.name, source_p->name, chan);
166 continue;
167 }
168
169 if (!IsExemptResv(source_p) &&
170 !(IsOper(source_p) && ConfigFileEntry.oper_pass_resv) &&
171 (!hash_find_resv(chan) == ConfigChannel.restrict_channels))
172 {
173 sendto_one(source_p, form_str(ERR_BADCHANNAME),
174 me.name, source_p->name, chan);
175 sendto_realops_flags(UMODE_SPY, L_ALL,
176 "User %s (%s@%s) is attempting to join locally juped channel %s",
177 source_p->name, source_p->username, source_p->host, chan);
178 continue;
179 }
180
181 if ((dlink_list_length(&source_p->channel) >= ConfigChannel.max_chans_per_user) &&
182 (!IsOper(source_p) || (dlink_list_length(&source_p->channel) >=
183 ConfigChannel.max_chans_per_user * 3)))
184 {
185 sendto_one(source_p, form_str(ERR_TOOMANYCHANNELS),
186 me.name, source_p->name, chan);
187 break;
188 }
189
190 if ((chptr = hash_find_channel(chan)) != NULL)
191 {
192 if (IsMember(source_p, chptr))
193 continue;
194
195 if (splitmode && !IsOper(source_p) && (*chan != '&') &&
196 ConfigChannel.no_join_on_split)
197 {
198 sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
199 me.name, source_p->name, chan);
200 continue;
201 }
202
203 /*
204 * This should never be the case unless there is some sort of
205 * persistant channels.
206 */
207 if (dlink_list_length(&chptr->members) == 0)
208 flags = CHFL_CHANOP;
209 else
210 flags = 0;
211 }
212 else
213 {
214 if (splitmode && !IsOper(source_p) && (*chan != '&') &&
215 (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split))
216 {
217 sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
218 me.name, source_p->name, chan);
219 continue;
220 }
221
222 flags = CHFL_CHANOP;
223 chptr = make_channel(chan);
224 }
225
226 if (!IsOper(source_p))
227 check_spambot_warning(source_p, chptr->chname);
228
229 /*
230 * can_join checks for +i key, bans.
231 */
232 if ((i = can_join(source_p, chptr, key)))
233 {
234 sendto_one(source_p, form_str(i), me.name,
235 source_p->name, chptr->chname);
236 continue;
237 }
238
239 add_user_to_channel(chptr, source_p, flags, YES);
240
241 /*
242 * Set timestamp if appropriate, and propagate
243 */
244 if (flags & CHFL_CHANOP)
245 {
246 chptr->channelts = CurrentTime;
247 chptr->mode.mode |= MODE_TOPICLIMIT;
248 chptr->mode.mode |= MODE_NOPRIVMSGS;
249
250 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
251 ":%s SJOIN %lu %s +nt :@%s",
252 me.id, (unsigned long)chptr->channelts,
253 chptr->chname, source_p->id);
254 sendto_server(client_p, chptr, NOCAPS, CAP_TS6,
255 ":%s SJOIN %lu %s +nt :@%s",
256 me.name, (unsigned long)chptr->channelts,
257 chptr->chname, source_p->name);
258 /*
259 * notify all other users on the new channel
260 */
261 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
262 source_p->name, source_p->username,
263 source_p->host, chptr->chname);
264 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s +nt",
265 me.name, chptr->chname);
266 }
267 else
268 {
269 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
270 ":%s JOIN %lu %s +",
271 source_p->id, (unsigned long)chptr->channelts,
272 chptr->chname);
273 sendto_server(client_p, chptr, NOCAPS, CAP_TS6,
274 ":%s SJOIN %lu %s + :%s",
275 me.name, (unsigned long)chptr->channelts,
276 chptr->chname, source_p->name);
277
278 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
279 source_p->name, source_p->username,
280 source_p->host, chptr->chname);
281 }
282
283 del_invite(chptr, source_p);
284
285 if (chptr->topic != NULL)
286 {
287 sendto_one(source_p, form_str(RPL_TOPIC), me.name,
288 source_p->name, chptr->chname, chptr->topic);
289
290 sendto_one(source_p, form_str(RPL_TOPICWHOTIME),
291 me.name, source_p->name, chptr->chname,
292 chptr->topic_info, chptr->topic_time);
293 }
294
295 channel_member_names(source_p, chptr, 1);
296
297 source_p->localClient->last_join_time = CurrentTime;
298 }
299 }
300
301 /* ms_join()
302 *
303 * inputs - parv[0] = uid
304 * parv[1] = ts
305 * parv[2] = channel name
306 * parv[3] = modes (Deprecated)
307 * output - none
308 * side effects - handles remote JOIN's sent by servers. In TSora
309 * remote clients are joined using SJOIN, hence a
310 * JOIN sent by a server on behalf of a client is an error.
311 * here, the initial code is in to take an extra parameter
312 * and use it for the TimeStamp on a new channel.
313 */
314 static void
315 ms_join(struct Client *client_p, struct Client *source_p,
316 int parc, char *parv[])
317 {
318 time_t newts = 0;
319 time_t oldts = 0;
320 int keep_our_modes = 1;
321 int keep_new_modes = 1;
322 int isnew = 0;
323 const char *servername = NULL;
324 struct Channel *chptr = NULL;
325 struct Mode mode, *oldmode;
326
327 if (parc == 2 && !irccmp(parv[1], "0"))
328 {
329 do_join_0(client_p, source_p);
330 return;
331 }
332
333 if (parc < 4 || *parv[2] == '&')
334 return;
335
336 if (!check_channel_name(parv[2], 0))
337 {
338 sendto_realops_flags(UMODE_DEBUG, L_ALL,
339 "*** Too long or invalid channel name from %s: %s",
340 client_p->name, parv[2]);
341 return;
342 }
343
344 mbuf = modebuf;
345 mode.mode = mode.limit = 0;
346 mode.key[0] = '\0';
347
348 if ((chptr = hash_find_channel(parv[2])) == NULL)
349 {
350 isnew = 1;
351 chptr = make_channel(parv[2]);
352 }
353
354 newts = atol(parv[1]);
355 oldts = chptr->channelts;
356 oldmode = &chptr->mode;
357
358 if (ConfigFileEntry.ignore_bogus_ts)
359 {
360 if (newts < 800000000)
361 {
362 sendto_realops_flags(UMODE_DEBUG, L_ALL,
363 "*** Bogus TS %lu on %s ignored from %s",
364 (unsigned long)newts, chptr->chname,
365 client_p->name);
366
367 newts = (oldts == 0) ? 0 : 800000000;
368 }
369 }
370 else
371 {
372 if (!newts && !isnew && oldts)
373 {
374 sendto_channel_local(ALL_MEMBERS, NO, chptr,
375 ":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to 0",
376 me.name, chptr->chname, chptr->chname, (unsigned long)oldts);
377 sendto_realops_flags(UMODE_ALL, L_ALL,
378 "Server %s changing TS on %s from %lu to 0",
379 source_p->name, chptr->chname, (unsigned long)oldts);
380 }
381 }
382
383 if (isnew)
384 chptr->channelts = newts;
385 else if (newts == 0 || oldts == 0)
386 chptr->channelts = 0;
387 else if (newts == oldts)
388 ;
389 else if (newts < oldts)
390 {
391 keep_our_modes = NO;
392 chptr->channelts = newts;
393 }
394 else
395 keep_new_modes = NO;
396
397 if (!keep_new_modes)
398 mode = *oldmode;
399 else if (keep_our_modes)
400 {
401 mode.mode |= oldmode->mode;
402 if (oldmode->limit > mode.limit)
403 mode.limit = oldmode->limit;
404 if (strcmp(mode.key, oldmode->key) < 0)
405 strcpy(mode.key, oldmode->key);
406 }
407
408 set_final_mode(&mode, oldmode);
409 chptr->mode = mode;
410
411 /* Lost the TS, other side wins, so remove modes on this side */
412 if (!keep_our_modes)
413 {
414 remove_our_modes(chptr, source_p);
415
416 if (chptr->topic)
417 {
418 set_channel_topic(chptr, NULL, NULL, 0);
419 chptr->topic_time = 0;
420 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :",
421 (IsHidden(source_p) ||
422 ConfigServerHide.hide_servers) ?
423 me.name : source_p->name, chptr->chname);
424 }
425
426 sendto_channel_local(ALL_MEMBERS, NO, chptr,
427 ":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to %lu",
428 me.name, chptr->chname, chptr->chname,
429 (unsigned long)oldts, (unsigned long)newts);
430 }
431
432 if (*modebuf != '\0')
433 {
434 servername = (ConfigServerHide.hide_servers || IsHidden(source_p)) ?
435 me.name : source_p->name;
436
437 /* This _SHOULD_ be to ALL_MEMBERS
438 * It contains only +imnpstlk, etc */
439 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s",
440 servername, chptr->chname, modebuf, parabuf);
441 }
442
443 if (!IsMember(source_p, chptr))
444 {
445 add_user_to_channel(chptr, source_p, 0, YES);
446 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
447 source_p->name, source_p->username,
448 source_p->host, chptr->chname);
449 }
450
451 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
452 ":%s JOIN %lu %s +",
453 ID(source_p), (unsigned long)chptr->channelts, chptr->chname);
454 sendto_server(client_p, chptr, NOCAPS, CAP_TS6,
455 ":%s SJOIN %lu %s + :%s",
456 source_p->servptr->name, (unsigned long)chptr->channelts,
457 chptr->chname, source_p->name);
458 }
459
460 /* do_join_0()
461 *
462 * inputs - pointer to client doing join 0
463 * output - NONE
464 * side effects - Use has decided to join 0. This is legacy
465 * from the days when channels were numbers not names. *sigh*
466 * There is a bunch of evilness necessary here due to
467 * anti spambot code.
468 */
469 static void
470 do_join_0(struct Client *client_p, struct Client *source_p)
471 {
472 struct Channel *chptr = NULL;
473 dlink_node *ptr = NULL, *ptr_next = NULL;
474
475 if (source_p->channel.head && MyConnect(source_p) && !IsOper(source_p))
476 check_spambot_warning(source_p, NULL);
477
478 DLINK_FOREACH_SAFE(ptr, ptr_next, source_p->channel.head)
479 {
480 chptr = ((struct Membership *)ptr->data)->chptr;
481
482 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
483 ":%s PART %s", ID(source_p), chptr->chname);
484 sendto_server(client_p, chptr, NOCAPS, CAP_TS6,
485 ":%s PART %s", source_p->name, chptr->chname);
486 sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s PART %s",
487 source_p->name, source_p->username,
488 source_p->host, chptr->chname);
489
490 remove_user_from_channel(ptr->data);
491 }
492 }
493
494 /* set_final_mode()
495 *
496 * inputs - pointer to mode to setup
497 * - pointer to old mode
498 * output - NONE
499 * side effects -
500 */
501 static const struct mode_letter
502 {
503 unsigned int mode;
504 unsigned char letter;
505 } flags[] = {
506 { MODE_NOPRIVMSGS, 'n' },
507 { MODE_TOPICLIMIT, 't' },
508 { MODE_SECRET, 's' },
509 { MODE_MODERATED, 'm' },
510 { MODE_INVITEONLY, 'i' },
511 { MODE_PRIVATE, 'p' },
512 { 0, '\0' }
513 };
514
515 static void
516 set_final_mode(struct Mode *mode, struct Mode *oldmode)
517 {
518 char *pbuf = parabuf;
519 int what = 0;
520 int len;
521 int i;
522
523 for (i = 0; flags[i].letter; i++)
524 {
525 if ((flags[i].mode & mode->mode) &&
526 !(flags[i].mode & oldmode->mode))
527 {
528 if (what != 1)
529 {
530 *mbuf++ = '+';
531 what = 1;
532 }
533 *mbuf++ = flags[i].letter;
534 }
535 }
536
537 for (i = 0; flags[i].letter; i++)
538 {
539 if ((flags[i].mode & oldmode->mode) &&
540 !(flags[i].mode & mode->mode))
541 {
542 if (what != -1)
543 {
544 *mbuf++ = '-';
545 what = -1;
546 }
547 *mbuf++ = flags[i].letter;
548 }
549 }
550
551 if (oldmode->limit != 0 && mode->limit == 0)
552 {
553 if (what != -1)
554 {
555 *mbuf++ = '-';
556 what = -1;
557 }
558 *mbuf++ = 'l';
559 }
560
561 if (oldmode->key[0] && !mode->key[0])
562 {
563 if (what != -1)
564 {
565 *mbuf++ = '-';
566 what = -1;
567 }
568 *mbuf++ = 'k';
569 len = ircsprintf(pbuf, "%s ", oldmode->key);
570 pbuf += len;
571 }
572
573 if (mode->limit != 0 && oldmode->limit != mode->limit)
574 {
575 if (what != 1)
576 {
577 *mbuf++ = '+';
578 what = 1;
579 }
580 *mbuf++ = 'l';
581 len = ircsprintf(pbuf, "%d ", mode->limit);
582 pbuf += len;
583 }
584
585 if (mode->key[0] && strcmp(oldmode->key, mode->key))
586 {
587 if (what != 1)
588 {
589 *mbuf++ = '+';
590 what = 1;
591 }
592 *mbuf++ = 'k';
593 len = ircsprintf(pbuf, "%s ", mode->key);
594 pbuf += len;
595 }
596 *mbuf = '\0';
597 }
598
599 /* remove_our_modes()
600 *
601 * inputs - pointer to channel to remove modes from
602 * - client pointer
603 * output - NONE
604 * side effects - Go through the local members, remove all their
605 * chanop modes etc., this side lost the TS.
606 */
607 static void
608 remove_our_modes(struct Channel *chptr, struct Client *source_p)
609 {
610 remove_a_mode(chptr, source_p, CHFL_CHANOP, 'o');
611 #ifdef HALFOPS
612 remove_a_mode(chptr, source_p, CHFL_HALFOP, 'h');
613 #endif
614 remove_a_mode(chptr, source_p, CHFL_VOICE, 'v');
615 }
616
617 /* remove_a_mode()
618 *
619 * inputs -
620 * output - NONE
621 * side effects - remove ONE mode from a channel
622 */
623 static void
624 remove_a_mode(struct Channel *chptr, struct Client *source_p,
625 int mask, char flag)
626 {
627 dlink_node *ptr;
628 struct Membership *ms;
629 char lmodebuf[MODEBUFLEN];
630 const char *lpara[MAXMODEPARAMS];
631 int count = 0;
632 int lcount;
633
634 mbuf = lmodebuf;
635 *mbuf++ = '-';
636
637 for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
638 lpara[lcount] = "";
639 sendbuf[0] = '\0';
640
641 DLINK_FOREACH(ptr, chptr->members.head)
642 {
643 ms = ptr->data;
644
645 if ((ms->flags & mask) == 0)
646 continue;
647
648 ms->flags &= ~mask;
649
650 lpara[count++] = ms->client_p->name;
651
652 *mbuf++ = flag;
653
654 if (count >= MAXMODEPARAMS)
655 {
656 for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
657 {
658 if (*lpara[lcount] == '\0')
659 break;
660
661 strlcat(sendbuf, " ", sizeof(sendbuf));
662 strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
663 lpara[lcount] = "";
664 }
665
666 *mbuf = '\0';
667 sendto_channel_local(ALL_MEMBERS, NO, chptr,
668 ":%s MODE %s %s%s",
669 (IsHidden(source_p) ||
670 ConfigServerHide.hide_servers) ?
671 me.name : source_p->name,
672 chptr->chname, lmodebuf, sendbuf);
673 mbuf = lmodebuf;
674 *mbuf++ = '-';
675 count = 0;
676 sendbuf[0] = '\0';
677 }
678 }
679
680 if (count != 0)
681 {
682 *mbuf = '\0';
683 for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
684 {
685 if (*lpara[lcount] == '\0')
686 break;
687
688 strlcat(sendbuf, " ", sizeof(sendbuf));
689 strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
690 }
691 sendto_channel_local(ALL_MEMBERS, NO, chptr,
692 ":%s MODE %s %s%s",
693 (IsHidden(source_p) || ConfigServerHide.hide_servers) ?
694 me.name : source_p->name,
695 chptr->chname, lmodebuf, sendbuf);
696 }
697 }
698

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