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root/svn/ircd-hybrid/branches/8.2.x/src/channel.c
Revision: 4414
Committed: Thu Aug 7 14:06:08 2014 UTC (9 years, 7 months ago) by michael
Content type: text/x-csrc
File size: 33198 byte(s)
Log Message:
- Removed ipv6 detection. We now assume all systems that run hybrid have
  ipv6 availability and sockaddr_storage.

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 1997-2014 ircd-hybrid development team
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 "conf.h"
34 #include "hostmask.h"
35 #include "irc_string.h"
36 #include "ircd.h"
37 #include "numeric.h"
38 #include "server.h"
39 #include "send.h"
40 #include "event.h"
41 #include "memory.h"
42 #include "mempool.h"
43 #include "misc.h"
44 #include "resv.h"
45
46
47 dlink_list channel_list;
48 mp_pool_t *ban_pool; /*! \todo ban_pool shouldn't be a global var */
49
50 struct event splitmode_event =
51 {
52 .name = "check_splitmode",
53 .handler = check_splitmode,
54 .when = 5
55 };
56
57 static mp_pool_t *member_pool, *channel_pool;
58
59
60 /*! \brief Initializes the channel blockheap, adds known channel CAPAB
61 */
62 void
63 channel_init(void)
64 {
65 add_capability("EX", CAP_EX, 1);
66 add_capability("IE", CAP_IE, 1);
67
68 channel_pool = mp_pool_new(sizeof(struct Channel), MP_CHUNK_SIZE_CHANNEL);
69 ban_pool = mp_pool_new(sizeof(struct Ban), MP_CHUNK_SIZE_BAN);
70 member_pool = mp_pool_new(sizeof(struct Membership), MP_CHUNK_SIZE_MEMBER);
71 }
72
73 /*! \brief Adds a user to a channel by adding another link to the
74 * channels member chain.
75 * \param chptr Pointer to channel to add client to
76 * \param who Pointer to client (who) to add
77 * \param flags Flags for chanops etc
78 * \param flood_ctrl Whether to count this join in flood calculations
79 */
80 void
81 add_user_to_channel(struct Channel *chptr, struct Client *who,
82 unsigned int flags, int flood_ctrl)
83 {
84 struct Membership *ms = NULL;
85
86 if (GlobalSetOptions.joinfloodtime > 0)
87 {
88 if (flood_ctrl)
89 ++chptr->number_joined;
90
91 chptr->number_joined -= (CurrentTime - chptr->last_join_time) *
92 (((float)GlobalSetOptions.joinfloodcount) /
93 (float)GlobalSetOptions.joinfloodtime);
94
95 if (chptr->number_joined <= 0)
96 {
97 chptr->number_joined = 0;
98 ClearJoinFloodNoticed(chptr);
99 }
100 else if (chptr->number_joined >= GlobalSetOptions.joinfloodcount)
101 {
102 chptr->number_joined = GlobalSetOptions.joinfloodcount;
103
104 if (!IsSetJoinFloodNoticed(chptr))
105 {
106 SetJoinFloodNoticed(chptr);
107 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
108 "Possible Join Flooder %s on %s target: %s",
109 get_client_name(who, HIDE_IP),
110 who->servptr->name, chptr->chname);
111 }
112 }
113
114 chptr->last_join_time = CurrentTime;
115 }
116
117 ms = mp_pool_get(member_pool);
118 ms->client_p = who;
119 ms->chptr = chptr;
120 ms->flags = flags;
121
122 dlinkAdd(ms, &ms->channode, &chptr->members);
123
124 if (MyConnect(who))
125 dlinkAdd(ms, &ms->locchannode, &chptr->locmembers);
126
127 dlinkAdd(ms, &ms->usernode, &who->channel);
128 }
129
130 /*! \brief Deletes an user from a channel by removing a link in the
131 * channels member chain.
132 * \param member Pointer to Membership struct
133 */
134 void
135 remove_user_from_channel(struct Membership *member)
136 {
137 struct Client *client_p = member->client_p;
138 struct Channel *chptr = member->chptr;
139
140 dlinkDelete(&member->channode, &chptr->members);
141
142 if (MyConnect(client_p))
143 dlinkDelete(&member->locchannode, &chptr->locmembers);
144
145 dlinkDelete(&member->usernode, &client_p->channel);
146
147 mp_pool_release(member);
148
149 if (chptr->members.head == NULL)
150 destroy_channel(chptr);
151 }
152
153 /* send_members()
154 *
155 * inputs -
156 * output - NONE
157 * side effects -
158 */
159 static void
160 send_members(struct Client *client_p, struct Channel *chptr,
161 char *modebuf, char *parabuf)
162 {
163 char buf[IRCD_BUFSIZE] = "";
164 const dlink_node *ptr = NULL;
165 int tlen; /* length of text to append */
166 char *t, *start; /* temp char pointer */
167
168 start = t = buf + snprintf(buf, sizeof(buf), ":%s SJOIN %lu %s %s %s:",
169 me.id, (unsigned long)chptr->channelts,
170 chptr->chname, modebuf, parabuf);
171
172 DLINK_FOREACH(ptr, chptr->members.head)
173 {
174 const struct Membership *ms = ptr->data;
175
176 tlen = strlen(ms->client_p->id) + 1; /* +1 for space */
177
178 if (ms->flags & CHFL_CHANOP)
179 ++tlen;
180 if (ms->flags & CHFL_HALFOP)
181 ++tlen;
182 if (ms->flags & CHFL_VOICE)
183 ++tlen;
184
185 /*
186 * Space will be converted into CR, but we also need space for LF..
187 * That's why we use '- 1' here -adx
188 */
189 if (t + tlen - buf > IRCD_BUFSIZE - 1)
190 {
191 *(t - 1) = '\0'; /* Kill the space and terminate the string */
192 sendto_one(client_p, "%s", buf);
193 t = start;
194 }
195
196 if (ms->flags & CHFL_CHANOP)
197 *t++ = '@';
198 if (ms->flags & CHFL_HALFOP)
199 *t++ = '%';
200 if (ms->flags & CHFL_VOICE)
201 *t++ = '+';
202
203 strcpy(t, ms->client_p->id);
204
205 t += strlen(t);
206 *t++ = ' ';
207 }
208
209 /* Should always be non-NULL unless we have a kind of persistent channels */
210 if (chptr->members.head)
211 t--; /* Take the space out */
212 *t = '\0';
213 sendto_one(client_p, "%s", buf);
214 }
215
216 /*! \brief Sends +b/+e/+I
217 * \param client_p Client pointer to server
218 * \param chptr Pointer to channel
219 * \param list Pointer to list of modes to send
220 * \param flag Char flag flagging type of mode. Currently this can be 'b', e' or 'I'
221 */
222 static void
223 send_mode_list(struct Client *client_p, struct Channel *chptr,
224 const dlink_list *list, const char flag)
225 {
226 const dlink_node *ptr = NULL;
227 char mbuf[IRCD_BUFSIZE] = "";
228 char pbuf[IRCD_BUFSIZE] = "";
229 int tlen, mlen, cur_len;
230 char *pp = pbuf;
231
232 if (list->length == 0)
233 return;
234
235 mlen = snprintf(mbuf, sizeof(mbuf), ":%s BMASK %lu %s %c :", me.id,
236 (unsigned long)chptr->channelts, chptr->chname, flag);
237 cur_len = mlen;
238
239 DLINK_FOREACH(ptr, list->head)
240 {
241 const struct Ban *banptr = ptr->data;
242
243 tlen = banptr->len + 3; /* +3 for ! + @ + space */
244
245 /*
246 * Send buffer and start over if we cannot fit another ban
247 */
248 if (cur_len + (tlen - 1) > IRCD_BUFSIZE - 2)
249 {
250 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
251 sendto_one(client_p, "%s%s", mbuf, pbuf);
252
253 cur_len = mlen;
254 pp = pbuf;
255 }
256
257 pp += sprintf(pp, "%s!%s@%s ", banptr->name, banptr->user,
258 banptr->host);
259 cur_len += tlen;
260 }
261
262 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
263 sendto_one(client_p, "%s%s", mbuf, pbuf);
264 }
265
266 /*! \brief Send "client_p" a full list of the modes for channel chptr
267 * \param client_p Pointer to client client_p
268 * \param chptr Pointer to channel pointer
269 */
270 void
271 send_channel_modes(struct Client *client_p, struct Channel *chptr)
272 {
273 char modebuf[MODEBUFLEN] = "";
274 char parabuf[MODEBUFLEN] = "";
275
276 channel_modes(chptr, client_p, modebuf, parabuf);
277 send_members(client_p, chptr, modebuf, parabuf);
278
279 send_mode_list(client_p, chptr, &chptr->banlist, 'b');
280 send_mode_list(client_p, chptr, &chptr->exceptlist, 'e');
281 send_mode_list(client_p, chptr, &chptr->invexlist, 'I');
282 }
283
284 /*! \brief Check channel name for invalid characters
285 * \param name Pointer to channel name string
286 * \param local Indicates whether it's a local or remote creation
287 * \return 0 if invalid, 1 otherwise
288 */
289 int
290 check_channel_name(const char *name, const int local)
291 {
292 const char *p = name;
293
294 assert(name != NULL);
295
296 if (!IsChanPrefix(*p))
297 return 0;
298
299 if (!local || !ConfigChannel.disable_fake_channels)
300 {
301 while (*++p)
302 if (!IsChanChar(*p))
303 return 0;
304 }
305 else
306 {
307 while (*++p)
308 if (!IsVisibleChanChar(*p))
309 return 0;
310 }
311
312 return p - name <= CHANNELLEN;
313 }
314
315 void
316 remove_ban(struct Ban *bptr, dlink_list *list)
317 {
318 dlinkDelete(&bptr->node, list);
319
320 MyFree(bptr->name);
321 MyFree(bptr->user);
322 MyFree(bptr->host);
323 MyFree(bptr->who);
324
325 mp_pool_release(bptr);
326 }
327
328 /* free_channel_list()
329 *
330 * inputs - pointer to dlink_list
331 * output - NONE
332 * side effects -
333 */
334 void
335 free_channel_list(dlink_list *list)
336 {
337 dlink_node *ptr = NULL, *ptr_next = NULL;
338
339 DLINK_FOREACH_SAFE(ptr, ptr_next, list->head)
340 remove_ban(ptr->data, list);
341
342 assert(list->tail == NULL && list->head == NULL);
343 }
344
345 /*! \brief Get Channel block for chname (and allocate a new channel
346 * block, if it didn't exist before)
347 * \param chname Channel name
348 * \return Channel block
349 */
350 struct Channel *
351 make_channel(const char *chname)
352 {
353 struct Channel *chptr = NULL;
354
355 assert(!EmptyString(chname));
356
357 chptr = mp_pool_get(channel_pool);
358
359 /* Doesn't hurt to set it here */
360 chptr->channelts = CurrentTime;
361 chptr->last_join_time = CurrentTime;
362
363 strlcpy(chptr->chname, chname, sizeof(chptr->chname));
364 dlinkAdd(chptr, &chptr->node, &channel_list);
365
366 hash_add_channel(chptr);
367
368 return chptr;
369 }
370
371 /*! \brief Walk through this channel, and destroy it.
372 * \param chptr Channel pointer
373 */
374 void
375 destroy_channel(struct Channel *chptr)
376 {
377 dlink_node *ptr = NULL, *ptr_next = NULL;
378
379 DLINK_FOREACH_SAFE(ptr, ptr_next, chptr->invites.head)
380 del_invite(chptr, ptr->data);
381
382 /* Free ban/exception/invex lists */
383 free_channel_list(&chptr->banlist);
384 free_channel_list(&chptr->exceptlist);
385 free_channel_list(&chptr->invexlist);
386
387 dlinkDelete(&chptr->node, &channel_list);
388 hash_del_channel(chptr);
389
390 mp_pool_release(chptr);
391 }
392
393 /*!
394 * \param chptr Pointer to channel
395 * \return String pointer "=" if public, "@" if secret else "*"
396 */
397 static const char *
398 channel_pub_or_secret(const struct Channel *chptr)
399 {
400 if (SecretChannel(chptr))
401 return "@";
402 if (PrivateChannel(chptr))
403 return "*";
404 return "=";
405 }
406
407 /*! \brief lists all names on given channel
408 * \param source_p Pointer to client struct requesting names
409 * \param chptr Pointer to channel block
410 * \param show_eon Show RPL_ENDOFNAMES numeric or not
411 * (don't want it with /names with no params)
412 */
413 void
414 channel_member_names(struct Client *source_p, struct Channel *chptr,
415 int show_eon)
416 {
417 const dlink_node *ptr = NULL;
418 char buf[IRCD_BUFSIZE + 1] = "";
419 char *t = NULL, *start = NULL;
420 int tlen = 0;
421 int is_member = IsMember(source_p, chptr);
422 int multi_prefix = HasCap(source_p, CAP_MULTI_PREFIX) != 0;
423 int uhnames = HasCap(source_p, CAP_UHNAMES) != 0;
424
425 if (PubChannel(chptr) || is_member)
426 {
427 t = buf + snprintf(buf, sizeof(buf), numeric_form(RPL_NAMREPLY),
428 me.name, source_p->name,
429 channel_pub_or_secret(chptr), chptr->chname);
430 start = t;
431
432 DLINK_FOREACH(ptr, chptr->members.head)
433 {
434 const struct Membership *ms = ptr->data;
435
436 if (HasUMode(ms->client_p, UMODE_INVISIBLE) && !is_member)
437 continue;
438
439 if (!uhnames)
440 tlen = strlen(ms->client_p->name) + 1; /* +1 for space */
441 else
442 tlen = strlen(ms->client_p->name) + strlen(ms->client_p->username) +
443 strlen(ms->client_p->host) + 3; /* +3 for ! + @ + space */
444
445 if (!multi_prefix)
446 {
447 if (ms->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
448 ++tlen;
449 }
450 else
451 {
452 if (ms->flags & CHFL_CHANOP)
453 ++tlen;
454 if (ms->flags & CHFL_HALFOP)
455 ++tlen;
456 if (ms->flags & CHFL_VOICE)
457 ++tlen;
458 }
459
460 if (t + tlen - buf > IRCD_BUFSIZE - 2)
461 {
462 *(t - 1) = '\0';
463 sendto_one(source_p, "%s", buf);
464 t = start;
465 }
466
467 if (!uhnames)
468 t += sprintf(t, "%s%s ", get_member_status(ms, multi_prefix),
469 ms->client_p->name);
470 else
471 t += sprintf(t, "%s%s!%s@%s ", get_member_status(ms, multi_prefix),
472 ms->client_p->name, ms->client_p->username,
473 ms->client_p->host);
474 }
475
476 if (tlen)
477 {
478 *(t - 1) = '\0';
479 sendto_one(source_p, "%s", buf);
480 }
481 }
482
483 if (show_eon)
484 sendto_one_numeric(source_p, &me, RPL_ENDOFNAMES, chptr->chname);
485 }
486
487 /*! \brief Adds client to invite list
488 * \param chptr Pointer to channel block
489 * \param who Pointer to client to add invite to
490 */
491 void
492 add_invite(struct Channel *chptr, struct Client *who)
493 {
494 del_invite(chptr, who);
495
496 /*
497 * Delete last link in chain if the list is max length
498 */
499 if (dlink_list_length(&who->localClient->invited) >=
500 ConfigChannel.max_channels)
501 del_invite(who->localClient->invited.tail->data, who);
502
503 /* Add client to channel invite list */
504 dlinkAdd(who, make_dlink_node(), &chptr->invites);
505
506 /* Add channel to the end of the client invite list */
507 dlinkAdd(chptr, make_dlink_node(), &who->localClient->invited);
508 }
509
510 /*! \brief Delete Invite block from channel invite list
511 * and client invite list
512 * \param chptr Pointer to Channel struct
513 * \param who Pointer to client to remove invites from
514 */
515 void
516 del_invite(struct Channel *chptr, struct Client *who)
517 {
518 dlink_node *ptr = NULL;
519
520 if ((ptr = dlinkFindDelete(&who->localClient->invited, chptr)))
521 free_dlink_node(ptr);
522
523 if ((ptr = dlinkFindDelete(&chptr->invites, who)))
524 free_dlink_node(ptr);
525 }
526
527 /* get_member_status()
528 *
529 * inputs - pointer to struct Membership
530 * - YES if we can combine different flags
531 * output - string either @, +, % or "" depending on whether
532 * chanop, voiced or user
533 * side effects -
534 *
535 * NOTE: Returned string is usually a static buffer
536 * (like in get_client_name)
537 */
538 const char *
539 get_member_status(const struct Membership *ms, const int combine)
540 {
541 static char buffer[4]; /* 4 for @%+\0 */
542 char *p = buffer;
543
544 if (ms->flags & CHFL_CHANOP)
545 {
546 if (!combine)
547 return "@";
548 *p++ = '@';
549 }
550
551 if (ms->flags & CHFL_HALFOP)
552 {
553 if (!combine)
554 return "%";
555 *p++ = '%';
556 }
557
558 if (ms->flags & CHFL_VOICE)
559 *p++ = '+';
560 *p = '\0';
561
562 return buffer;
563 }
564
565 /*!
566 * \param who Pointer to Client to check
567 * \param list Pointer to ban list to search
568 * \return 1 if ban found for given n!u\@h mask, 0 otherwise
569 *
570 */
571 static int
572 find_bmask(const struct Client *who, const dlink_list *const list)
573 {
574 const dlink_node *ptr = NULL;
575
576 DLINK_FOREACH(ptr, list->head)
577 {
578 const struct Ban *bp = ptr->data;
579
580 if (!match(bp->name, who->name) && !match(bp->user, who->username))
581 {
582 switch (bp->type)
583 {
584 case HM_HOST:
585 if (!match(bp->host, who->host) || !match(bp->host, who->sockhost))
586 return 1;
587 break;
588 case HM_IPV4:
589 if (who->localClient->aftype == AF_INET)
590 if (match_ipv4(&who->localClient->ip, &bp->addr, bp->bits))
591 return 1;
592 break;
593 case HM_IPV6:
594 if (who->localClient->aftype == AF_INET6)
595 if (match_ipv6(&who->localClient->ip, &bp->addr, bp->bits))
596 return 1;
597 break;
598 default:
599 assert(0);
600 }
601 }
602 }
603
604 return 0;
605 }
606
607 /*!
608 * \param chptr Pointer to channel block
609 * \param who Pointer to client to check access fo
610 * \return 0 if not banned, 1 otherwise
611 */
612 int
613 is_banned(const struct Channel *chptr, const struct Client *who)
614 {
615 if (find_bmask(who, &chptr->banlist))
616 if (!find_bmask(who, &chptr->exceptlist))
617 return 1;
618
619 return 0;
620 }
621
622 /*! Tests if a client can join a certain channel
623 * \param source_p Pointer to client attempting to join
624 * \param chptr Pointer to channel
625 * \param key Key sent by client attempting to join if present
626 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
627 * or 0 if allowed to join.
628 */
629 int
630 can_join(struct Client *source_p, struct Channel *chptr, const char *key)
631 {
632 if ((chptr->mode.mode & MODE_SSLONLY) && !HasUMode(source_p, UMODE_SSL))
633 return ERR_SSLONLYCHAN;
634
635 if ((chptr->mode.mode & MODE_REGONLY) && !HasUMode(source_p, UMODE_REGISTERED))
636 return ERR_NEEDREGGEDNICK;
637
638 if ((chptr->mode.mode & MODE_OPERONLY) && !HasUMode(source_p, UMODE_OPER))
639 return ERR_OPERONLYCHAN;
640
641 if (chptr->mode.mode & MODE_INVITEONLY)
642 if (!dlinkFind(&source_p->localClient->invited, chptr))
643 if (!find_bmask(source_p, &chptr->invexlist))
644 return ERR_INVITEONLYCHAN;
645
646 if (chptr->mode.key[0] && (!key || strcmp(chptr->mode.key, key)))
647 return ERR_BADCHANNELKEY;
648
649 if (chptr->mode.limit && dlink_list_length(&chptr->members) >=
650 chptr->mode.limit)
651 return ERR_CHANNELISFULL;
652
653 if (is_banned(chptr, source_p))
654 return ERR_BANNEDFROMCHAN;
655
656 return 0;
657 }
658
659 int
660 has_member_flags(const struct Membership *ms, const unsigned int flags)
661 {
662 return ms && (ms->flags & flags);
663 }
664
665 struct Membership *
666 find_channel_link(struct Client *client_p, struct Channel *chptr)
667 {
668 dlink_node *ptr = NULL;
669
670 if (!IsClient(client_p))
671 return NULL;
672
673 if (dlink_list_length(&chptr->members) < dlink_list_length(&client_p->channel))
674 {
675 DLINK_FOREACH(ptr, chptr->members.head)
676 if (((struct Membership *)ptr->data)->client_p == client_p)
677 return ptr->data;
678 }
679 else
680 {
681 DLINK_FOREACH(ptr, client_p->channel.head)
682 if (((struct Membership *)ptr->data)->chptr == chptr)
683 return ptr->data;
684 }
685
686 return NULL;
687 }
688
689 /*! Tests if a client can send to a channel
690 * \param message The actual message string the client wants to send
691 * \return 1 if the message does contain any control codes, 0 otherwise
692 */
693 static int
694 msg_has_ctrls(const char *message)
695 {
696 const unsigned char *p = (const unsigned char *)message;
697
698 for (; *p; ++p)
699 {
700 if (*p > 31 || *p == 1)
701 continue; /* No control code or CTCP */
702
703 if (*p == 27) /* Escape */
704 {
705 /* ISO 2022 charset shift sequence */
706 if (*(p + 1) == '$' ||
707 *(p + 1) == '(')
708 {
709 ++p;
710 continue;
711 }
712 }
713
714 return 1; /* Control code */
715 }
716
717 return 0;
718 }
719
720 /*! Tests if a client can send to a channel
721 * \param chptr Pointer to Channel struct
722 * \param source_p Pointer to Client struct
723 * \param ms Pointer to Membership struct (can be NULL)
724 * \param message The actual message string the client wants to send
725 * \return CAN_SEND_OPV if op or voiced on channel\n
726 * CAN_SEND_NONOP if can send to channel but is not an op\n
727 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
728 */
729 int
730 can_send(struct Channel *chptr, struct Client *source_p,
731 struct Membership *ms, const char *message)
732 {
733 struct MaskItem *conf = NULL;
734
735 if (IsServer(source_p) || HasFlag(source_p, FLAGS_SERVICE))
736 return CAN_SEND_OPV;
737
738 if (MyClient(source_p) && !IsExemptResv(source_p))
739 if (!(HasUMode(source_p, UMODE_OPER) && ConfigGeneral.oper_pass_resv))
740 if ((conf = match_find_resv(chptr->chname)) && !resv_find_exempt(source_p, conf))
741 return ERR_CANNOTSENDTOCHAN;
742
743 if ((chptr->mode.mode & MODE_NOCTRL) && msg_has_ctrls(message))
744 return ERR_NOCTRLSONCHAN;
745 if (ms || (ms = find_channel_link(source_p, chptr)))
746 if (ms->flags & (CHFL_CHANOP|CHFL_HALFOP|CHFL_VOICE))
747 return CAN_SEND_OPV;
748 if (!ms && (chptr->mode.mode & MODE_NOPRIVMSGS))
749 return ERR_CANNOTSENDTOCHAN;
750 if (chptr->mode.mode & MODE_MODERATED)
751 return ERR_CANNOTSENDTOCHAN;
752 if ((chptr->mode.mode & MODE_MODREG) && !HasUMode(source_p, UMODE_REGISTERED))
753 return ERR_NEEDREGGEDNICK;
754
755 /* Cache can send if banned */
756 if (MyClient(source_p))
757 {
758 if (ms)
759 {
760 if (ms->flags & CHFL_BAN_SILENCED)
761 return ERR_CANNOTSENDTOCHAN;
762
763 if (!(ms->flags & CHFL_BAN_CHECKED))
764 {
765 if (is_banned(chptr, source_p))
766 {
767 ms->flags |= (CHFL_BAN_CHECKED|CHFL_BAN_SILENCED);
768 return ERR_CANNOTSENDTOCHAN;
769 }
770
771 ms->flags |= CHFL_BAN_CHECKED;
772 }
773 }
774 else if (is_banned(chptr, source_p))
775 return ERR_CANNOTSENDTOCHAN;
776 }
777
778 return CAN_SEND_NONOP;
779 }
780
781 /*! \brief Updates the client's oper_warn_count_down, warns the
782 * IRC operators if necessary, and updates
783 * join_leave_countdown as needed.
784 * \param source_p Pointer to struct Client to check
785 * \param name Channel name or NULL if this is a part.
786 */
787 void
788 check_spambot_warning(struct Client *source_p, const char *name)
789 {
790 int t_delta = 0;
791 int decrement_count = 0;
792
793 if ((GlobalSetOptions.spam_num &&
794 (source_p->localClient->join_leave_count >=
795 GlobalSetOptions.spam_num)))
796 {
797 if (source_p->localClient->oper_warn_count_down > 0)
798 source_p->localClient->oper_warn_count_down--;
799 else
800 source_p->localClient->oper_warn_count_down = 0;
801
802 if (source_p->localClient->oper_warn_count_down == 0)
803 {
804 /* It's already known as a possible spambot */
805 if (name)
806 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
807 "User %s (%s@%s) trying to join %s is a possible spambot",
808 source_p->name, source_p->username,
809 source_p->host, name);
810 else
811 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
812 "User %s (%s@%s) is a possible spambot",
813 source_p->name, source_p->username,
814 source_p->host);
815 source_p->localClient->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
816 }
817 }
818 else
819 {
820 if ((t_delta = (CurrentTime - source_p->localClient->last_leave_time)) >
821 JOIN_LEAVE_COUNT_EXPIRE_TIME)
822 {
823 decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
824 if (decrement_count > source_p->localClient->join_leave_count)
825 source_p->localClient->join_leave_count = 0;
826 else
827 source_p->localClient->join_leave_count -= decrement_count;
828 }
829 else
830 {
831 if ((CurrentTime - (source_p->localClient->last_join_time)) <
832 GlobalSetOptions.spam_time)
833 source_p->localClient->join_leave_count++; /* It's a possible spambot */
834 }
835
836 if (name)
837 source_p->localClient->last_join_time = CurrentTime;
838 else
839 source_p->localClient->last_leave_time = CurrentTime;
840 }
841 }
842
843 /*! \brief Compares usercount and servercount against their split
844 * values and adjusts splitmode accordingly
845 * \param unused Unused address pointer
846 */
847 void
848 check_splitmode(void *unused)
849 {
850 if (splitchecking && (ConfigChannel.no_join_on_split ||
851 ConfigChannel.no_create_on_split))
852 {
853 const unsigned int server = dlink_list_length(&global_server_list);
854
855 if (!splitmode && ((server < split_servers) || (Count.total < split_users)))
856 {
857 splitmode = 1;
858
859 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
860 "Network split, activating splitmode");
861 event_add(&splitmode_event, NULL);
862 }
863 else if (splitmode && (server >= split_servers) && (Count.total >= split_users))
864 {
865 splitmode = 0;
866
867 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
868 "Network rejoined, deactivating splitmode");
869 event_delete(&splitmode_event);
870 }
871 }
872 }
873
874 /*! \brief Sets the channel topic for a certain channel
875 * \param chptr Pointer to struct Channel
876 * \param topic The topic string
877 * \param topic_info n!u\@h formatted string of the topic setter
878 * \param topicts Timestamp on the topic
879 * \param local Whether the topic is set by a local client
880 */
881 void
882 channel_set_topic(struct Channel *chptr, const char *topic,
883 const char *topic_info, time_t topicts, int local)
884 {
885 if (local)
886 strlcpy(chptr->topic, topic, IRCD_MIN(sizeof(chptr->topic), ConfigServerInfo.max_topic_length + 1));
887 else
888 strlcpy(chptr->topic, topic, sizeof(chptr->topic));
889
890 strlcpy(chptr->topic_info, topic_info, sizeof(chptr->topic_info));
891 chptr->topic_time = topicts;
892 }
893
894 /* do_join_0()
895 *
896 * inputs - pointer to client doing join 0
897 * output - NONE
898 * side effects - Use has decided to join 0. This is legacy
899 * from the days when channels were numbers not names. *sigh*
900 * There is a bunch of evilness necessary here due to
901 * anti spambot code.
902 */
903 void
904 channel_do_join_0(struct Client *source_p)
905 {
906 dlink_node *ptr = NULL, *ptr_next = NULL;
907
908 if (source_p->channel.head)
909 if (MyConnect(source_p) && !HasUMode(source_p, UMODE_OPER))
910 check_spambot_warning(source_p, NULL);
911
912 DLINK_FOREACH_SAFE(ptr, ptr_next, source_p->channel.head)
913 {
914 struct Channel *chptr = ((struct Membership *)ptr->data)->chptr;
915
916 sendto_server(source_p, NOCAPS, NOCAPS, ":%s PART %s",
917 source_p->id, chptr->chname);
918 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s!%s@%s PART %s",
919 source_p->name, source_p->username,
920 source_p->host, chptr->chname);
921
922 remove_user_from_channel(ptr->data);
923 }
924 }
925
926 static char *
927 channel_find_last0(struct Client *source_p, char *chanlist)
928 {
929 int join0 = 0;
930
931 for (char *p = chanlist; *p; ++p) /* Find last "JOIN 0" */
932 {
933 if (*p == '0' && (*(p + 1) == ',' || *(p + 1) == '\0'))
934 {
935 if ((*p + 1) == ',')
936 ++p;
937
938 chanlist = p + 1;
939 join0 = 1;
940 }
941 else
942 {
943 while (*p != ',' && *p != '\0') /* Skip past channel name */
944 ++p;
945
946 if (*p == '\0') /* Hit the end */
947 break;
948 }
949 }
950
951 if (join0)
952 channel_do_join_0(source_p);
953
954 return chanlist;
955 }
956
957 void
958 channel_do_join(struct Client *source_p, char *channel, char *key_list)
959 {
960 char *p = NULL;
961 char *chan = NULL;
962 char *chan_list = NULL;
963 struct Channel *chptr = NULL;
964 struct MaskItem *conf = NULL;
965 const struct ClassItem *class = get_class_ptr(&source_p->localClient->confs);
966 int i = 0;
967 unsigned int flags = 0;
968
969 chan_list = channel_find_last0(source_p, channel);
970
971 for (chan = strtoken(&p, chan_list, ","); chan;
972 chan = strtoken(&p, NULL, ","))
973 {
974 const char *key = NULL;
975
976 /* If we have any more keys, take the first for this channel. */
977 if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
978 *key_list++ = '\0';
979
980 /* Empty keys are the same as no keys. */
981 if (key && *key == '\0')
982 key = NULL;
983
984 if (!check_channel_name(chan, 1))
985 {
986 sendto_one_numeric(source_p, &me, ERR_BADCHANNAME, chan);
987 continue;
988 }
989
990 if (!IsExemptResv(source_p) &&
991 !(HasUMode(source_p, UMODE_OPER) && ConfigGeneral.oper_pass_resv) &&
992 ((conf = match_find_resv(chan)) && !resv_find_exempt(source_p, conf)))
993 {
994 ++conf->count;
995 sendto_one_numeric(source_p, &me, ERR_CHANBANREASON,
996 chan, conf->reason ? conf->reason : "Reserved channel");
997 sendto_realops_flags(UMODE_REJ, L_ALL, SEND_NOTICE,
998 "Forbidding reserved channel %s from user %s",
999 chan, get_client_name(source_p, HIDE_IP));
1000 continue;
1001 }
1002
1003 if (dlink_list_length(&source_p->channel) >=
1004 ((class->max_channels) ? class->max_channels : ConfigChannel.max_channels))
1005 {
1006 sendto_one_numeric(source_p, &me, ERR_TOOMANYCHANNELS, chan);
1007 break;
1008 }
1009
1010 if ((chptr = hash_find_channel(chan)))
1011 {
1012 if (IsMember(source_p, chptr))
1013 continue;
1014
1015 if (splitmode && !HasUMode(source_p, UMODE_OPER) &&
1016 ConfigChannel.no_join_on_split)
1017 {
1018 sendto_one_numeric(source_p, &me, ERR_UNAVAILRESOURCE, chptr->chname);
1019 continue;
1020 }
1021
1022 /*
1023 * can_join checks for +i key, bans.
1024 */
1025 if ((i = can_join(source_p, chptr, key)))
1026 {
1027 sendto_one_numeric(source_p, &me, i, chptr->chname);
1028 continue;
1029 }
1030
1031 /*
1032 * This should never be the case unless there is some sort of
1033 * persistant channels.
1034 */
1035 if (dlink_list_length(&chptr->members) == 0)
1036 flags = CHFL_CHANOP;
1037 else
1038 flags = 0;
1039 }
1040 else
1041 {
1042 if (splitmode && !HasUMode(source_p, UMODE_OPER) &&
1043 (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split))
1044 {
1045 sendto_one_numeric(source_p, &me, ERR_UNAVAILRESOURCE, chan);
1046 continue;
1047 }
1048
1049 flags = CHFL_CHANOP;
1050 chptr = make_channel(chan);
1051 }
1052
1053 if (!HasUMode(source_p, UMODE_OPER))
1054 check_spambot_warning(source_p, chptr->chname);
1055
1056 add_user_to_channel(chptr, source_p, flags, 1);
1057
1058 /*
1059 * Set timestamp if appropriate, and propagate
1060 */
1061 if (flags == CHFL_CHANOP)
1062 {
1063 chptr->channelts = CurrentTime;
1064 chptr->mode.mode |= MODE_TOPICLIMIT;
1065 chptr->mode.mode |= MODE_NOPRIVMSGS;
1066
1067 sendto_server(source_p, NOCAPS, NOCAPS, ":%s SJOIN %lu %s +nt :@%s",
1068 me.id, (unsigned long)chptr->channelts,
1069 chptr->chname, source_p->id);
1070
1071 /*
1072 * Notify all other users on the new channel
1073 */
1074 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s!%s@%s JOIN :%s",
1075 source_p->name, source_p->username,
1076 source_p->host, chptr->chname);
1077 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s MODE %s +nt",
1078 me.name, chptr->chname);
1079
1080 if (source_p->away[0])
1081 sendto_channel_local_butone(source_p, 0, CAP_AWAY_NOTIFY, chptr,
1082 ":%s!%s@%s AWAY :%s",
1083 source_p->name, source_p->username,
1084 source_p->host, source_p->away);
1085 }
1086 else
1087 {
1088 sendto_server(source_p, NOCAPS, NOCAPS, ":%s JOIN %lu %s +",
1089 source_p->id, (unsigned long)chptr->channelts,
1090 chptr->chname);
1091 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s!%s@%s JOIN :%s",
1092 source_p->name, source_p->username,
1093 source_p->host, chptr->chname);
1094
1095 if (source_p->away[0])
1096 sendto_channel_local_butone(source_p, 0, CAP_AWAY_NOTIFY, chptr,
1097 ":%s!%s@%s AWAY :%s",
1098 source_p->name, source_p->username,
1099 source_p->host, source_p->away);
1100 }
1101
1102 del_invite(chptr, source_p);
1103
1104 if (chptr->topic[0])
1105 {
1106 sendto_one_numeric(source_p, &me, RPL_TOPIC, chptr->chname, chptr->topic);
1107 sendto_one_numeric(source_p, &me, RPL_TOPICWHOTIME, chptr->chname,
1108 chptr->topic_info, chptr->topic_time);
1109 }
1110
1111 channel_member_names(source_p, chptr, 1);
1112
1113 source_p->localClient->last_join_time = CurrentTime;
1114 }
1115 }
1116
1117 /*! \brief Removes a client from a specific channel
1118 * \param source_p Pointer to source client to remove
1119 * \param name Name of channel to remove from
1120 * \param reason Part reason to show
1121 */
1122 static void
1123 channel_part_one_client(struct Client *source_p, const char *name, const char *reason)
1124 {
1125 struct Channel *chptr = NULL;
1126 struct Membership *ms = NULL;
1127
1128 if ((chptr = hash_find_channel(name)) == NULL)
1129 {
1130 sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, name);
1131 return;
1132 }
1133
1134 if ((ms = find_channel_link(source_p, chptr)) == NULL)
1135 {
1136 sendto_one_numeric(source_p, &me, ERR_NOTONCHANNEL, chptr->chname);
1137 return;
1138 }
1139
1140 if (MyConnect(source_p) && !HasUMode(source_p, UMODE_OPER))
1141 check_spambot_warning(source_p, NULL);
1142
1143 /*
1144 * Remove user from the old channel (if any)
1145 * only allow /part reasons in -m chans
1146 */
1147 if (*reason && (!MyConnect(source_p) ||
1148 ((can_send(chptr, source_p, ms, reason) &&
1149 (source_p->localClient->firsttime + ConfigGeneral.anti_spam_exit_message_time)
1150 < CurrentTime))))
1151 {
1152 sendto_server(source_p, NOCAPS, NOCAPS, ":%s PART %s :%s",
1153 source_p->id, chptr->chname, reason);
1154 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s!%s@%s PART %s :%s",
1155 source_p->name, source_p->username,
1156 source_p->host, chptr->chname, reason);
1157 }
1158 else
1159 {
1160 sendto_server(source_p, NOCAPS, NOCAPS, ":%s PART %s",
1161 source_p->id, chptr->chname);
1162 sendto_channel_local(ALL_MEMBERS, 0, chptr, ":%s!%s@%s PART %s",
1163 source_p->name, source_p->username,
1164 source_p->host, chptr->chname);
1165 }
1166
1167 remove_user_from_channel(ms);
1168 }
1169
1170 void
1171 channel_do_part(struct Client *source_p, char *channel, char *reason)
1172 {
1173 char *p = NULL, *name = NULL;
1174 char reasonbuf[KICKLEN + 1] = "";
1175
1176 if (!EmptyString(reason))
1177 strlcpy(reasonbuf, reason, sizeof(reasonbuf));
1178
1179 for (name = strtoken(&p, channel, ","); name;
1180 name = strtoken(&p, NULL, ","))
1181 channel_part_one_client(source_p, name, reasonbuf);
1182 }

Properties

Name Value
svn:eol-style native
svn:keywords Id Revision