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Contents of /ircd-hybrid/branches/8.0.x/src/channel.c

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Revision 1683 - (show annotations)
Tue Dec 18 19:26:35 2012 UTC (7 years, 9 months ago) by michael
File MIME type: text/x-chdr
File size: 23574 byte(s)
- Backported -r1661 [CAP_EX and CAP_IE are now mandatory]

1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 *
4 * Copyright (C) 2002 by the past and present ircd coders, and others.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 */
21
22 /*! \file channel.c
23 * \brief Responsible for managing channels, members, bans and topics
24 * \version $Id$
25 */
26
27 #include "stdinc.h"
28 #include "list.h"
29 #include "channel.h"
30 #include "channel_mode.h"
31 #include "client.h"
32 #include "hash.h"
33 #include "hostmask.h"
34 #include "irc_string.h"
35 #include "sprintf_irc.h"
36 #include "ircd.h"
37 #include "numeric.h"
38 #include "s_serv.h" /* captab */
39 #include "s_user.h"
40 #include "send.h"
41 #include "conf.h" /* ConfigFileEntry, ConfigChannel */
42 #include "event.h"
43 #include "memory.h"
44 #include "balloc.h"
45
46 struct config_channel_entry ConfigChannel;
47 dlink_list global_channel_list = { NULL, NULL, 0 };
48 BlockHeap *ban_heap; /*! \todo ban_heap shouldn't be a global var */
49
50 static BlockHeap *member_heap = NULL;
51 static BlockHeap *channel_heap = NULL;
52
53 static char buf[IRCD_BUFSIZE];
54 static char modebuf[MODEBUFLEN];
55 static char parabuf[MODEBUFLEN];
56
57
58 /*! \brief Initializes the channel blockheap, adds known channel CAPAB
59 */
60 void
61 init_channels(void)
62 {
63 add_capability("EX", CAP_EX, 1);
64 add_capability("IE", CAP_IE, 1);
65 add_capability("CHW", CAP_CHW, 1);
66
67 channel_heap = BlockHeapCreate("channel", sizeof(struct Channel), CHANNEL_HEAP_SIZE);
68 ban_heap = BlockHeapCreate("ban", sizeof(struct Ban), BAN_HEAP_SIZE);
69 member_heap = BlockHeapCreate("member", sizeof(struct Membership), CHANNEL_HEAP_SIZE*2);
70 }
71
72 /*! \brief adds a user to a channel by adding another link to the
73 * channels member chain.
74 * \param chptr pointer to channel to add client to
75 * \param who pointer to client (who) to add
76 * \param flags flags for chanops etc
77 * \param flood_ctrl whether to count this join in flood calculations
78 */
79 void
80 add_user_to_channel(struct Channel *chptr, struct Client *who,
81 unsigned int flags, int flood_ctrl)
82 {
83 struct Membership *ms = NULL;
84
85 if (GlobalSetOptions.joinfloodtime > 0)
86 {
87 if (flood_ctrl)
88 chptr->number_joined++;
89
90 chptr->number_joined -= (CurrentTime - chptr->last_join_time) *
91 (((float)GlobalSetOptions.joinfloodcount) /
92 (float)GlobalSetOptions.joinfloodtime);
93
94 if (chptr->number_joined <= 0)
95 {
96 chptr->number_joined = 0;
97 ClearJoinFloodNoticed(chptr);
98 }
99 else if (chptr->number_joined >= GlobalSetOptions.joinfloodcount)
100 {
101 chptr->number_joined = GlobalSetOptions.joinfloodcount;
102
103 if (!IsSetJoinFloodNoticed(chptr))
104 {
105 SetJoinFloodNoticed(chptr);
106 sendto_realops_flags(UMODE_BOTS, L_ALL,
107 "Possible Join Flooder %s on %s target: %s",
108 get_client_name(who, HIDE_IP),
109 who->servptr->name, chptr->chname);
110 }
111 }
112
113 chptr->last_join_time = CurrentTime;
114 }
115
116 ms = BlockHeapAlloc(member_heap);
117 ms->client_p = who;
118 ms->chptr = chptr;
119 ms->flags = flags;
120
121 dlinkAdd(ms, &ms->channode, &chptr->members);
122 dlinkAdd(ms, &ms->usernode, &who->channel);
123 }
124
125 /*! \brief deletes an user from a channel by removing a link in the
126 * channels member chain.
127 * \param member pointer to Membership struct
128 */
129 void
130 remove_user_from_channel(struct Membership *member)
131 {
132 struct Client *client_p = member->client_p;
133 struct Channel *chptr = member->chptr;
134
135 dlinkDelete(&member->channode, &chptr->members);
136 dlinkDelete(&member->usernode, &client_p->channel);
137
138 BlockHeapFree(member_heap, member);
139
140 if (chptr->members.head == NULL)
141 destroy_channel(chptr);
142 }
143
144 /* send_members()
145 *
146 * inputs -
147 * output - NONE
148 * side effects -
149 */
150 static void
151 send_members(struct Client *client_p, struct Channel *chptr,
152 char *lmodebuf, char *lparabuf)
153 {
154 struct Membership *ms;
155 dlink_node *ptr;
156 int tlen; /* length of text to append */
157 char *t, *start; /* temp char pointer */
158
159 start = t = buf + ircsprintf(buf, ":%s SJOIN %lu %s %s %s:",
160 ID_or_name(&me, client_p),
161 (unsigned long)chptr->channelts,
162 chptr->chname, lmodebuf, lparabuf);
163
164 DLINK_FOREACH(ptr, chptr->members.head)
165 {
166 ms = ptr->data;
167
168 tlen = strlen(IsCapable(client_p, CAP_TS6) ?
169 ID(ms->client_p) : ms->client_p->name) + 1; /* nick + space */
170
171 if (ms->flags & CHFL_CHANOP)
172 tlen++;
173 #ifdef HALFOPS
174 else if (ms->flags & CHFL_HALFOP)
175 tlen++;
176 #endif
177 if (ms->flags & CHFL_VOICE)
178 tlen++;
179
180 /* space will be converted into CR, but we also need space for LF..
181 * That's why we use '- 1' here
182 * -adx */
183 if (t + tlen - buf > IRCD_BUFSIZE - 1)
184 {
185 *(t - 1) = '\0'; /* kill the space and terminate the string */
186 sendto_one(client_p, "%s", buf);
187 t = start;
188 }
189
190 if ((ms->flags & (CHFL_CHANOP | CHFL_HALFOP)))
191 *t++ = (!(ms->flags & CHFL_CHANOP) && IsCapable(client_p, CAP_HOPS)) ?
192 '%' : '@';
193 if ((ms->flags & CHFL_VOICE))
194 *t++ = '+';
195
196 if (IsCapable(client_p, CAP_TS6))
197 strcpy(t, ID(ms->client_p));
198 else
199 strcpy(t, ms->client_p->name);
200 t += strlen(t);
201 *t++ = ' ';
202 }
203
204 /* should always be non-NULL unless we have a kind of persistent channels */
205 if (chptr->members.head != NULL)
206 t--; /* take the space out */
207 *t = '\0';
208 sendto_one(client_p, "%s", buf);
209 }
210
211 /*! \brief sends +b/+e/+I
212 * \param client_p client pointer to server
213 * \param chptr pointer to channel
214 * \param top pointer to top of mode link list to send
215 * \param flag char flag flagging type of mode. Currently this can be 'b', e' or 'I'
216 */
217 static void
218 send_mode_list(struct Client *client_p, struct Channel *chptr,
219 dlink_list *top, char flag)
220 {
221 int ts5 = !IsCapable(client_p, CAP_TS6);
222 dlink_node *lp;
223 struct Ban *banptr;
224 char pbuf[IRCD_BUFSIZE];
225 int tlen, mlen, cur_len, count = 0;
226 char *mp = NULL, *pp = pbuf;
227
228 if (top == NULL || top->length == 0)
229 return;
230
231 if (ts5)
232 mlen = ircsprintf(buf, ":%s MODE %s +", me.name, chptr->chname);
233 else
234 mlen = ircsprintf(buf, ":%s BMASK %lu %s %c :", me.id,
235 (unsigned long)chptr->channelts, chptr->chname, flag);
236
237 /* MODE needs additional one byte for space between buf and pbuf */
238 cur_len = mlen + ts5;
239 mp = buf + mlen;
240
241 DLINK_FOREACH(lp, top->head)
242 {
243 banptr = lp->data;
244
245 /* must add another b/e/I letter if we use MODE */
246 tlen = banptr->len + 3 + ts5;
247
248 /*
249 * send buffer and start over if we cannot fit another ban,
250 * or if the target is non-ts6 and we have too many modes in
251 * in this line.
252 */
253 if (cur_len + (tlen - 1) > IRCD_BUFSIZE - 2 ||
254 (!IsCapable(client_p, CAP_TS6) &&
255 (count >= MAXMODEPARAMS || pp - pbuf >= MODEBUFLEN)))
256 {
257 *(pp - 1) = '\0'; /* get rid of trailing space on buffer */
258 sendto_one(client_p, "%s%s%s", buf, ts5 ? " " : "", pbuf);
259
260 cur_len = mlen + ts5;
261 mp = buf + mlen;
262 pp = pbuf;
263 count = 0;
264 }
265
266 count++;
267 if (ts5)
268 {
269 *mp++ = flag;
270 *mp = '\0';
271 }
272
273 pp += ircsprintf(pp, "%s!%s@%s ", banptr->name, banptr->username,
274 banptr->host);
275 cur_len += tlen;
276 }
277
278 *(pp - 1) = '\0'; /* get rid of trailing space on buffer */
279 sendto_one(client_p, "%s%s%s", buf, ts5 ? " " : "", pbuf);
280 }
281
282 /*! \brief send "client_p" a full list of the modes for channel chptr
283 * \param client_p pointer to client client_p
284 * \param chptr pointer to channel pointer
285 */
286 void
287 send_channel_modes(struct Client *client_p, struct Channel *chptr)
288 {
289 *modebuf = *parabuf = '\0';
290 channel_modes(chptr, client_p, modebuf, parabuf);
291 send_members(client_p, chptr, modebuf, parabuf);
292
293 send_mode_list(client_p, chptr, &chptr->banlist, 'b');
294 send_mode_list(client_p, chptr, &chptr->exceptlist, 'e');
295 send_mode_list(client_p, chptr, &chptr->invexlist, 'I');
296 }
297
298 /*! \brief check channel name for invalid characters
299 * \param name pointer to channel name string
300 * \param local indicates whether it's a local or remote creation
301 * \return 0 if invalid, 1 otherwise
302 */
303 int
304 check_channel_name(const char *name, int local)
305 {
306 const char *p = name;
307 const int max_length = local ? LOCAL_CHANNELLEN : CHANNELLEN;
308 assert(name != NULL);
309
310 if (!IsChanPrefix(*p))
311 return 0;
312
313 if (!local || !ConfigChannel.disable_fake_channels)
314 {
315 while (*++p)
316 if (!IsChanChar(*p))
317 return 0;
318 }
319 else
320 {
321 while (*++p)
322 if (!IsVisibleChanChar(*p))
323 return 0;
324 }
325
326 return p - name <= max_length;
327 }
328
329 void
330 remove_ban(struct Ban *bptr, dlink_list *list)
331 {
332 dlinkDelete(&bptr->node, list);
333
334 MyFree(bptr->name);
335 MyFree(bptr->username);
336 MyFree(bptr->host);
337 MyFree(bptr->who);
338
339 BlockHeapFree(ban_heap, bptr);
340 }
341
342 /* free_channel_list()
343 *
344 * inputs - pointer to dlink_list
345 * output - NONE
346 * side effects -
347 */
348 void
349 free_channel_list(dlink_list *list)
350 {
351 dlink_node *ptr = NULL, *next_ptr = NULL;
352
353 DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
354 remove_ban(ptr->data, list);
355
356 assert(list->tail == NULL && list->head == NULL);
357 }
358
359 /*! \brief Get Channel block for chname (and allocate a new channel
360 * block, if it didn't exist before)
361 * \param chname channel name
362 * \return channel block
363 */
364 struct Channel *
365 make_channel(const char *chname)
366 {
367 struct Channel *chptr = NULL;
368
369 assert(!EmptyString(chname));
370
371 chptr = BlockHeapAlloc(channel_heap);
372
373 /* doesn't hurt to set it here */
374 chptr->channelts = CurrentTime;
375 chptr->last_join_time = CurrentTime;
376
377 strlcpy(chptr->chname, chname, sizeof(chptr->chname));
378 dlinkAdd(chptr, &chptr->node, &global_channel_list);
379
380 hash_add_channel(chptr);
381
382 return chptr;
383 }
384
385 /*! \brief walk through this channel, and destroy it.
386 * \param chptr channel pointer
387 */
388 void
389 destroy_channel(struct Channel *chptr)
390 {
391 dlink_node *ptr = NULL, *ptr_next = NULL;
392
393 DLINK_FOREACH_SAFE(ptr, ptr_next, chptr->invites.head)
394 del_invite(chptr, ptr->data);
395
396 /* free ban/exception/invex lists */
397 free_channel_list(&chptr->banlist);
398 free_channel_list(&chptr->exceptlist);
399 free_channel_list(&chptr->invexlist);
400
401 dlinkDelete(&chptr->node, &global_channel_list);
402 hash_del_channel(chptr);
403
404 BlockHeapFree(channel_heap, chptr);
405 }
406
407 /*!
408 * \param chptr pointer to channel
409 * \return string pointer "=" if public, "@" if secret else "*"
410 */
411 static const char *
412 channel_pub_or_secret(const struct Channel *chptr)
413 {
414 if (SecretChannel(chptr))
415 return "@";
416 if (PrivateChannel(chptr))
417 return "*";
418 return "=";
419 }
420
421 /*! \brief lists all names on given channel
422 * \param source_p pointer to client struct requesting names
423 * \param chptr pointer to channel block
424 * \param show_eon show ENDOFNAMES numeric or not
425 * (don't want it with /names with no params)
426 */
427 void
428 channel_member_names(struct Client *source_p, struct Channel *chptr,
429 int show_eon)
430 {
431 struct Client *target_p = NULL;
432 struct Membership *ms = NULL;
433 dlink_node *ptr = NULL;
434 char lbuf[IRCD_BUFSIZE + 1];
435 char *t = NULL, *start = NULL;
436 int tlen = 0;
437 int is_member = IsMember(source_p, chptr);
438 int multi_prefix = HasCap(source_p, CAP_MULTI_PREFIX) != 0;
439
440 if (PubChannel(chptr) || is_member)
441 {
442 t = lbuf + ircsprintf(lbuf, form_str(RPL_NAMREPLY),
443 me.name, source_p->name,
444 channel_pub_or_secret(chptr),
445 chptr->chname);
446 start = t;
447
448 DLINK_FOREACH(ptr, chptr->members.head)
449 {
450 ms = ptr->data;
451 target_p = ms->client_p;
452
453 if (HasUMode(target_p, UMODE_INVISIBLE) && !is_member)
454 continue;
455
456 tlen = strlen(target_p->name) + 1; /* nick + space */
457
458 if (!multi_prefix)
459 {
460 if (ms->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
461 ++tlen;
462 }
463 else
464 {
465 if (ms->flags & CHFL_CHANOP)
466 ++tlen;
467 if (ms->flags & CHFL_HALFOP)
468 ++tlen;
469 if (ms->flags & CHFL_VOICE)
470 ++tlen;
471 }
472
473 if (t + tlen - lbuf > IRCD_BUFSIZE - 2)
474 {
475 *(t - 1) = '\0';
476 sendto_one(source_p, "%s", lbuf);
477 t = start;
478 }
479
480 t += ircsprintf(t, "%s%s ", get_member_status(ms, multi_prefix),
481 target_p->name);
482 }
483
484 if (tlen != 0)
485 {
486 *(t - 1) = '\0';
487 sendto_one(source_p, "%s", lbuf);
488 }
489 }
490
491 if (show_eon)
492 sendto_one(source_p, form_str(RPL_ENDOFNAMES),
493 me.name, source_p->name, chptr->chname);
494 }
495
496 /*! \brief adds client to invite list
497 * \param chptr pointer to channel block
498 * \param who pointer to client to add invite to
499 */
500 void
501 add_invite(struct Channel *chptr, struct Client *who)
502 {
503 del_invite(chptr, who);
504
505 /*
506 * delete last link in chain if the list is max length
507 */
508 if (dlink_list_length(&who->localClient->invited) >=
509 ConfigChannel.max_chans_per_user)
510 del_invite(who->localClient->invited.tail->data, who);
511
512 /* add client to channel invite list */
513 dlinkAdd(who, make_dlink_node(), &chptr->invites);
514
515 /* add channel to the end of the client invite list */
516 dlinkAdd(chptr, make_dlink_node(), &who->localClient->invited);
517 }
518
519 /*! \brief Delete Invite block from channel invite list
520 * and client invite list
521 * \param chptr pointer to Channel struct
522 * \param who pointer to client to remove invites from
523 */
524 void
525 del_invite(struct Channel *chptr, struct Client *who)
526 {
527 dlink_node *ptr = NULL;
528
529 if ((ptr = dlinkFindDelete(&who->localClient->invited, chptr)))
530 free_dlink_node(ptr);
531
532 if ((ptr = dlinkFindDelete(&chptr->invites, who)))
533 free_dlink_node(ptr);
534 }
535
536 /* get_member_status()
537 *
538 * inputs - pointer to struct Membership
539 * - YES if we can combine different flags
540 * output - string either @, +, % or "" depending on whether
541 * chanop, voiced or user
542 * side effects -
543 *
544 * NOTE: Returned string is usually a static buffer
545 * (like in get_client_name)
546 */
547 const char *
548 get_member_status(const struct Membership *ms, int combine)
549 {
550 static char buffer[4];
551 char *p = NULL;
552
553 if (ms == NULL)
554 return "";
555 p = buffer;
556
557 if (ms->flags & CHFL_CHANOP)
558 {
559 if (!combine)
560 return "@";
561 *p++ = '@';
562 }
563
564 #ifdef HALFOPS
565 if (ms->flags & CHFL_HALFOP)
566 {
567 if (!combine)
568 return "%";
569 *p++ = '%';
570 }
571 #endif
572
573 if (ms->flags & CHFL_VOICE)
574 *p++ = '+';
575 *p = '\0';
576
577 return buffer;
578 }
579
580 /*!
581 * \param who pointer to Client to check
582 * \param list pointer to ban list to search
583 * \return 1 if ban found for given n!u\@h mask, 0 otherwise
584 *
585 */
586 static int
587 find_bmask(const struct Client *who, const dlink_list *const list)
588 {
589 const dlink_node *ptr = NULL;
590
591 DLINK_FOREACH(ptr, list->head)
592 {
593 const struct Ban *bp = ptr->data;
594
595 if (match(bp->name, who->name) && match(bp->username, who->username))
596 {
597 switch (bp->type)
598 {
599 case HM_HOST:
600 if (match(bp->host, who->host) || match(bp->host, who->sockhost))
601 return 1;
602 break;
603 case HM_IPV4:
604 if (who->localClient->aftype == AF_INET)
605 if (match_ipv4(&who->localClient->ip, &bp->addr, bp->bits))
606 return 1;
607 break;
608 #ifdef IPV6
609 case HM_IPV6:
610 if (who->localClient->aftype == AF_INET6)
611 if (match_ipv6(&who->localClient->ip, &bp->addr, bp->bits))
612 return 1;
613 break;
614 #endif
615 default:
616 assert(0);
617 }
618 }
619 }
620
621 return 0;
622 }
623
624 /*!
625 * \param chptr pointer to channel block
626 * \param who pointer to client to check access fo
627 * \return 0 if not banned, 1 otherwise
628 */
629 int
630 is_banned(const struct Channel *chptr, const struct Client *who)
631 {
632 if (find_bmask(who, &chptr->banlist))
633 if (!find_bmask(who, &chptr->exceptlist))
634 return 1;
635
636 return 0;
637 }
638
639 /*!
640 * \param source_p pointer to client attempting to join
641 * \param chptr pointer to channel
642 * \param key key sent by client attempting to join if present
643 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
644 * or 0 if allowed to join.
645 */
646 int
647 can_join(struct Client *source_p, struct Channel *chptr, const char *key)
648 {
649 if (is_banned(chptr, source_p))
650 return ERR_BANNEDFROMCHAN;
651
652 #ifdef HAVE_LIBCRYPTO
653 if ((chptr->mode.mode & MODE_SSLONLY) && !source_p->localClient->fd.ssl)
654 return ERR_SSLONLYCHAN;
655 #endif
656
657 if ((chptr->mode.mode & MODE_REGONLY) && !HasUMode(source_p, UMODE_REGISTERED))
658 return ERR_NEEDREGGEDNICK;
659
660 if ((chptr->mode.mode & MODE_OPERONLY) && !HasUMode(source_p, UMODE_OPER))
661 return ERR_OPERONLYCHAN;
662
663 if (chptr->mode.mode & MODE_INVITEONLY)
664 if (!dlinkFind(&source_p->localClient->invited, chptr))
665 if (!find_bmask(source_p, &chptr->invexlist))
666 return ERR_INVITEONLYCHAN;
667
668 if (chptr->mode.key[0] && (!key || strcmp(chptr->mode.key, key)))
669 return ERR_BADCHANNELKEY;
670
671 if (chptr->mode.limit && dlink_list_length(&chptr->members) >=
672 chptr->mode.limit)
673 return ERR_CHANNELISFULL;
674
675 return 0;
676 }
677
678 int
679 has_member_flags(struct Membership *ms, unsigned int flags)
680 {
681 if (ms != NULL)
682 return ms->flags & flags;
683 return 0;
684 }
685
686 struct Membership *
687 find_channel_link(struct Client *client_p, struct Channel *chptr)
688 {
689 dlink_node *ptr = NULL;
690
691 if (!IsClient(client_p))
692 return NULL;
693
694 DLINK_FOREACH(ptr, client_p->channel.head)
695 if (((struct Membership *)ptr->data)->chptr == chptr)
696 return ptr->data;
697
698 return NULL;
699 }
700
701 /*!
702 * \param chptr pointer to Channel struct
703 * \param source_p pointer to Client struct
704 * \param ms pointer to Membership struct (can be NULL)
705 * \return CAN_SEND_OPV if op or voiced on channel\n
706 * CAN_SEND_NONOP if can send to channel but is not an op\n
707 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
708 */
709 int
710 can_send(struct Channel *chptr, struct Client *source_p, struct Membership *ms)
711 {
712 if (IsServer(source_p) || HasFlag(source_p, FLAGS_SERVICE))
713 return CAN_SEND_OPV;
714
715 if (MyClient(source_p) && !IsExemptResv(source_p))
716 if (!(HasUMode(source_p, UMODE_OPER) && ConfigFileEntry.oper_pass_resv))
717 if (!hash_find_resv(chptr->chname) == ConfigChannel.restrict_channels)
718 return ERR_CANNOTSENDTOCHAN;
719
720 if (ms != NULL || (ms = find_channel_link(source_p, chptr)))
721 {
722 if (ms->flags & (CHFL_CHANOP|CHFL_HALFOP|CHFL_VOICE))
723 return CAN_SEND_OPV;
724
725 /* cache can send if quiet_on_ban and banned */
726 if (ConfigChannel.quiet_on_ban && MyClient(source_p))
727 {
728 if (ms->flags & CHFL_BAN_SILENCED)
729 return ERR_CANNOTSENDTOCHAN;
730
731 if (!(ms->flags & CHFL_BAN_CHECKED))
732 {
733 if (is_banned(chptr, source_p))
734 {
735 ms->flags |= (CHFL_BAN_CHECKED|CHFL_BAN_SILENCED);
736 return ERR_CANNOTSENDTOCHAN;
737 }
738
739 ms->flags |= CHFL_BAN_CHECKED;
740 }
741 }
742 }
743 else if (chptr->mode.mode & MODE_NOPRIVMSGS)
744 return ERR_CANNOTSENDTOCHAN;
745
746 if (chptr->mode.mode & MODE_MODERATED)
747 return ERR_CANNOTSENDTOCHAN;
748
749 return CAN_SEND_NONOP;
750 }
751
752 /*! \brief Updates the client's oper_warn_count_down, warns the
753 * IRC operators if necessary, and updates
754 * join_leave_countdown as needed.
755 * \param source_p pointer to struct Client to check
756 * \param name channel name or NULL if this is a part.
757 */
758 void
759 check_spambot_warning(struct Client *source_p, const char *name)
760 {
761 int t_delta = 0;
762 int decrement_count = 0;
763
764 if ((GlobalSetOptions.spam_num &&
765 (source_p->localClient->join_leave_count >=
766 GlobalSetOptions.spam_num)))
767 {
768 if (source_p->localClient->oper_warn_count_down > 0)
769 source_p->localClient->oper_warn_count_down--;
770 else
771 source_p->localClient->oper_warn_count_down = 0;
772
773 if (source_p->localClient->oper_warn_count_down == 0)
774 {
775 /* Its already known as a possible spambot */
776 if (name != NULL)
777 sendto_realops_flags(UMODE_BOTS, L_ALL,
778 "User %s (%s@%s) trying to join %s is a possible spambot",
779 source_p->name, source_p->username,
780 source_p->host, name);
781 else
782 sendto_realops_flags(UMODE_BOTS, L_ALL,
783 "User %s (%s@%s) is a possible spambot",
784 source_p->name, source_p->username,
785 source_p->host);
786 source_p->localClient->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
787 }
788 }
789 else
790 {
791 if ((t_delta = (CurrentTime - source_p->localClient->last_leave_time)) >
792 JOIN_LEAVE_COUNT_EXPIRE_TIME)
793 {
794 decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
795 if (decrement_count > source_p->localClient->join_leave_count)
796 source_p->localClient->join_leave_count = 0;
797 else
798 source_p->localClient->join_leave_count -= decrement_count;
799 }
800 else
801 {
802 if ((CurrentTime - (source_p->localClient->last_join_time)) <
803 GlobalSetOptions.spam_time)
804 {
805 /* oh, its a possible spambot */
806 source_p->localClient->join_leave_count++;
807 }
808 }
809
810 if (name != NULL)
811 source_p->localClient->last_join_time = CurrentTime;
812 else
813 source_p->localClient->last_leave_time = CurrentTime;
814 }
815 }
816
817 /*! \brief compares usercount and servercount against their split
818 * values and adjusts splitmode accordingly
819 * \param unused Unused address pointer
820 */
821 void
822 check_splitmode(void *unused)
823 {
824 if (splitchecking && (ConfigChannel.no_join_on_split ||
825 ConfigChannel.no_create_on_split))
826 {
827 const unsigned int server = dlink_list_length(&global_serv_list);
828
829 if (!splitmode && ((server < split_servers) || (Count.total < split_users)))
830 {
831 splitmode = 1;
832
833 sendto_realops_flags(UMODE_ALL,L_ALL,
834 "Network split, activating splitmode");
835 eventAddIsh("check_splitmode", check_splitmode, NULL, 10);
836 }
837 else if (splitmode && (server > split_servers) && (Count.total > split_users))
838 {
839 splitmode = 0;
840
841 sendto_realops_flags(UMODE_ALL, L_ALL,
842 "Network rejoined, deactivating splitmode");
843 eventDelete(check_splitmode, NULL);
844 }
845 }
846 }
847
848 /*! \brief Sets the channel topic for chptr
849 * \param chptr Pointer to struct Channel
850 * \param topic The topic string
851 * \param topic_info n!u\@h formatted string of the topic setter
852 * \param topicts timestamp on the topic
853 */
854 void
855 set_channel_topic(struct Channel *chptr, const char *topic,
856 const char *topic_info, time_t topicts)
857 {
858 strlcpy(chptr->topic, topic, sizeof(chptr->topic));
859 strlcpy(chptr->topic_info, topic_info, sizeof(chptr->topic_info));
860 chptr->topic_time = topicts;
861 }

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