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Revision 10026 - (show annotations)
Fri Jan 14 15:11:00 2022 UTC (4 months, 1 week ago) by michael
File MIME type: text/x-chdr
File size: 33466 byte(s)
- channel.c:channel_demote_members(): rewrite to remove all member flags in a single run. Also members having multiple flags set are now stuffed into the same MODE message (as long as pargs <= MAXMODEPARAMS)

1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 1997-2022 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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_invite.h"
31 #include "channel_mode.h"
32 #include "client.h"
33 #include "hash.h"
34 #include "conf.h"
35 #include "conf_resv.h"
36 #include "hostmask.h"
37 #include "irc_string.h"
38 #include "ircd.h"
39 #include "numeric.h"
40 #include "server.h"
41 #include "send.h"
42 #include "event.h"
43 #include "memory.h"
44 #include "misc.h"
45 #include "extban.h"
46
47
48 /** Doubly linked list containing a list of all channels. */
49 static dlink_list channel_list;
50
51
52 /*! \brief Returns the channel_list as constant
53 * \return channel_list
54 */
55 const dlink_list *
56 channel_get_list(void)
57 {
58 return &channel_list;
59 }
60
61 /*! \brief Adds a user to a channel by adding another link to the
62 * channels member chain.
63 * \param channel Pointer to channel to add client to
64 * \param client Pointer to client (who) to add
65 * \param flags Flags for chanops etc
66 * \param flood_ctrl Whether to count this join in flood calculations
67 */
68 void
69 add_user_to_channel(struct Channel *channel, struct Client *client,
70 unsigned int flags, bool flood_ctrl)
71 {
72 assert(IsClient(client));
73
74 if (GlobalSetOptions.joinfloodtime)
75 {
76 if (flood_ctrl == true)
77 ++channel->number_joined;
78
79 channel->number_joined -= (event_base->time.sec_monotonic - channel->last_join_time) *
80 (((float)GlobalSetOptions.joinfloodcount) /
81 (float)GlobalSetOptions.joinfloodtime);
82
83 if (channel->number_joined <= 0)
84 {
85 channel->number_joined = 0;
86 ClearJoinFloodNoticed(channel);
87 }
88 else if (channel->number_joined >= GlobalSetOptions.joinfloodcount)
89 {
90 channel->number_joined = GlobalSetOptions.joinfloodcount;
91
92 if (!IsSetJoinFloodNoticed(channel))
93 {
94 SetJoinFloodNoticed(channel);
95 sendto_realops_flags(UMODE_FLOOD, L_ALL, SEND_NOTICE,
96 "Possible Join Flooder %s on %s target: %s",
97 client_get_name(client, HIDE_IP),
98 client->servptr->name, channel->name);
99 }
100 }
101
102 channel->last_join_time = event_base->time.sec_monotonic;
103 }
104
105 struct ChannelMember *member = xcalloc(sizeof(*member));
106 member->client = client;
107 member->channel = channel;
108 member->flags = flags;
109
110 dlinkAdd(member, &member->channode, &channel->members);
111
112 if (MyConnect(client))
113 dlinkAdd(member, &member->locchannode, &channel->members_local);
114
115 dlinkAdd(member, &member->usernode, &client->channel);
116 }
117
118 /*! \brief Deletes an user from a channel by removing a link in the
119 * channels member chain.
120 * \param member Pointer to Membership struct
121 */
122 void
123 remove_user_from_channel(struct ChannelMember *member)
124 {
125 struct Client *const client = member->client;
126 struct Channel *const channel = member->channel;
127
128 dlinkDelete(&member->channode, &channel->members);
129
130 if (MyConnect(client))
131 dlinkDelete(&member->locchannode, &channel->members_local);
132
133 dlinkDelete(&member->usernode, &client->channel);
134
135 xfree(member);
136
137 if (channel->members.head == NULL)
138 channel_free(channel);
139 }
140
141 /* remove_a_mode()
142 *
143 * inputs -
144 * output - NONE
145 * side effects - remove ONE mode from a channel
146 */
147 void
148 channel_demote_members(struct Channel *channel, const struct Client *client)
149 {
150 dlink_node *node;
151 char modebuf[MAXMODEPARAMS + 1];
152 char parabuf[MAXMODEPARAMS * (NICKLEN + 1) + 1];
153 char *mbuf = modebuf;
154 char *pbuf = parabuf;
155 unsigned int pargs = 0;
156 struct member_status
157 {
158 unsigned char prefix;
159 unsigned int flag;
160 } table[] =
161 {
162 { 'o', CHFL_CHANOP },
163 { 'h', CHFL_HALFOP },
164 { 'v', CHFL_VOICE },
165 { '\0', 0 }
166 };
167
168 DLINK_FOREACH(node, channel->members.head)
169 {
170 struct ChannelMember *member = node->data;
171
172 for (const struct member_status *status = table; status->flag; ++status)
173 {
174 if (member->flags & status->flag)
175 {
176 member->flags &= ~status->flag;
177 *mbuf++ = status->prefix;
178 pbuf += snprintf(pbuf, sizeof(parabuf) - (pbuf - parabuf), "%s ", member->client->name);
179
180 if (++pargs >= MAXMODEPARAMS)
181 {
182 *mbuf = *(pbuf - 1) = '\0';
183 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s -%s %s",
184 client->name, channel->name, modebuf, parabuf);
185
186 mbuf = modebuf;
187 pbuf = parabuf;
188 pargs = 0;
189 }
190 }
191 }
192 }
193
194 if (pargs)
195 {
196 *mbuf = *(pbuf - 1) = '\0';
197 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s -%s %s",
198 client->name, channel->name, modebuf, parabuf);
199 }
200 }
201
202 /* channel_send_members()
203 *
204 * inputs -
205 * output - NONE
206 * side effects -
207 */
208 static void
209 channel_send_members(struct Client *client, const struct Channel *channel,
210 const char *modebuf, const char *parabuf)
211 {
212 dlink_node *node;
213 char buf[IRCD_BUFSIZE];
214 int tlen; /* length of text to append */
215 char *t, *start; /* temp char pointer */
216
217 start = t = buf + snprintf(buf, sizeof(buf), ":%s SJOIN %ju %s %s %s:",
218 me.id, channel->creation_time,
219 channel->name, modebuf, parabuf);
220
221 DLINK_FOREACH(node, channel->members.head)
222 {
223 const struct ChannelMember *member = node->data;
224
225 tlen = strlen(member->client->id) + 1; /* +1 for space */
226 tlen += member_get_prefix_len(member, true);
227
228 /*
229 * Space will be converted into CR, but we also need space for LF..
230 * That's why we use '- 1' here -adx
231 */
232 if (t + tlen - buf > sizeof(buf) - 1)
233 {
234 *(t - 1) = '\0'; /* Kill the space and terminate the string */
235 sendto_one(client, "%s", buf);
236 t = start;
237 }
238
239 t += snprintf(t, sizeof(buf) - (t - buf), "%s%s ", member_get_prefix(member, true), member->client->id);
240 }
241
242 /* Should always be non-NULL unless we have a kind of persistent channels */
243 if (channel->members.head)
244 --t; /* Take the space out */
245 *t = '\0';
246 sendto_one(client, "%s", buf);
247 }
248
249 /*! \brief Sends +b/+e/+I
250 * \param client Client pointer to server
251 * \param channel Pointer to channel
252 * \param list Pointer to list of modes to send
253 * \param flag Char flag flagging type of mode. Currently this can be 'b', e' or 'I'
254 */
255 static void
256 channel_send_mask_list(struct Client *client, const struct Channel *channel,
257 const dlink_list *list, const char flag)
258 {
259 dlink_node *node;
260 char modebuf[IRCD_BUFSIZE];
261 char parabuf[IRCD_BUFSIZE];
262 size_t tlen, mlen, cur_len;
263 char *pbuf = parabuf;
264
265 if (dlink_list_length(list) == 0)
266 return;
267
268 mlen = snprintf(modebuf, sizeof(modebuf), ":%s BMASK %ju %s %c :", me.id,
269 channel->creation_time, channel->name, flag);
270 cur_len = mlen;
271
272 DLINK_FOREACH(node, list->head)
273 {
274 const struct Ban *ban = node->data;
275
276 tlen = ban->banstr_len + 1; /* +1 for space */
277
278 /*
279 * Send buffer and start over if we cannot fit another ban
280 */
281 if (cur_len + (tlen - 1) > sizeof(parabuf) - 2)
282 {
283 *(pbuf - 1) = '\0'; /* Get rid of trailing space on buffer */
284 sendto_one(client, "%s%s", modebuf, parabuf);
285
286 cur_len = mlen;
287 pbuf = parabuf;
288 }
289
290 pbuf += snprintf(pbuf, sizeof(parabuf) - (pbuf - parabuf), "%s ", ban->banstr);
291 cur_len += tlen;
292 }
293
294 *(pbuf - 1) = '\0'; /* Get rid of trailing space on buffer */
295 sendto_one(client, "%s%s", modebuf, parabuf);
296 }
297
298 /*! \brief Send "client" a full list of the modes for channel channel
299 * \param client Pointer to client client
300 * \param channel Pointer to channel pointer
301 */
302 void
303 channel_send_modes(struct Client *client, const struct Channel *channel)
304 {
305 char modebuf[MODEBUFLEN] = "";
306 char parabuf[MODEBUFLEN] = "";
307
308 channel_modes(channel, client, NULL, modebuf, parabuf);
309 channel_send_members(client, channel, modebuf, parabuf);
310
311 channel_send_mask_list(client, channel, &channel->banlist, 'b');
312 channel_send_mask_list(client, channel, &channel->exceptlist, 'e');
313 channel_send_mask_list(client, channel, &channel->invexlist, 'I');
314 }
315
316 /*! \brief Check channel name for invalid characters
317 * \param name Pointer to channel name string
318 * \param local Indicates whether it's a local or remote creation
319 * \return false if invalid, true otherwise
320 */
321 bool
322 channel_check_name(const char *name, bool local)
323 {
324 const char *p = name;
325
326 assert(!EmptyString(p));
327
328 if (!IsChanPrefix(*p))
329 return false;
330
331 if (local == false || ConfigChannel.disable_fake_channels == 0)
332 {
333 while (*++p)
334 if (!IsChanChar(*p))
335 return false;
336 }
337 else
338 {
339 while (*++p)
340 if (!IsVisibleChanChar(*p))
341 return false;
342 }
343
344 return p - name <= CHANNELLEN;
345 }
346
347 void
348 remove_ban(struct Ban *ban, dlink_list *list)
349 {
350 dlinkDelete(&ban->node, list);
351 xfree(ban);
352 }
353
354 /* channel_free_mask_list()
355 *
356 * inputs - pointer to dlink_list
357 * output - NONE
358 * side effects -
359 */
360 static void
361 channel_free_mask_list(dlink_list *list)
362 {
363 while (list->head)
364 {
365 struct Ban *ban = list->head->data;
366 remove_ban(ban, list);
367 }
368 }
369
370 /*! \brief Get Channel block for name (and allocate a new channel
371 * block, if it didn't exist before)
372 * \param name Channel name
373 * \return Channel block
374 */
375 struct Channel *
376 channel_make(const char *name)
377 {
378 assert(!EmptyString(name));
379
380 struct Channel *channel = xcalloc(sizeof(*channel));
381 channel->hnextch = channel;
382 /* Doesn't hurt to set it here */
383 channel->creation_time = event_base->time.sec_real;
384 channel->last_join_time = event_base->time.sec_monotonic;
385
386 /* Cache channel name length to avoid repetitive strlen() calls. */
387 channel->name_len = strlcpy(channel->name, name, sizeof(channel->name));
388 if (channel->name_len >= sizeof(channel->name))
389 channel->name_len = sizeof(channel->name) - 1;
390
391 dlinkAdd(channel, &channel->node, &channel_list);
392 hash_add_channel(channel);
393
394 return channel;
395 }
396
397 /*! \brief Walk through this channel, and destroy it.
398 * \param channel Channel pointer
399 */
400 void
401 channel_free(struct Channel *channel)
402 {
403 invite_clear_list(&channel->invites);
404
405 /* Free ban/exception/invex lists */
406 channel_free_mask_list(&channel->banlist);
407 channel_free_mask_list(&channel->exceptlist);
408 channel_free_mask_list(&channel->invexlist);
409
410 dlinkDelete(&channel->node, &channel_list);
411 hash_del_channel(channel);
412
413 assert(channel->hnextch == channel);
414
415 assert(channel->node.prev == NULL);
416 assert(channel->node.next == NULL);
417
418 assert(dlink_list_length(&channel->members_local) == 0);
419 assert(channel->members_local.head == NULL);
420 assert(channel->members_local.tail == NULL);
421
422 assert(dlink_list_length(&channel->members) == 0);
423 assert(channel->members.head == NULL);
424 assert(channel->members.tail == NULL);
425
426 assert(dlink_list_length(&channel->invites) == 0);
427 assert(channel->invites.head == NULL);
428 assert(channel->invites.tail == NULL);
429
430 assert(dlink_list_length(&channel->banlist) == 0);
431 assert(channel->banlist.head == NULL);
432 assert(channel->banlist.tail == NULL);
433
434 assert(dlink_list_length(&channel->exceptlist) == 0);
435 assert(channel->exceptlist.head == NULL);
436 assert(channel->exceptlist.tail == NULL);
437
438 assert(dlink_list_length(&channel->invexlist) == 0);
439 assert(channel->invexlist.head == NULL);
440 assert(channel->invexlist.tail == NULL);
441
442 xfree(channel);
443 }
444
445 /*!
446 * \param channel Pointer to channel
447 * \return String pointer "=" if public, "@" if secret else "*"
448 */
449 static const char *
450 channel_pub_or_secret(const struct Channel *channel)
451 {
452 if (SecretChannel(channel))
453 return "@";
454 if (PrivateChannel(channel))
455 return "*";
456 return "=";
457 }
458
459 /*! \brief lists all names on given channel
460 * \param client Pointer to client struct requesting names
461 * \param channel Pointer to channel block
462 */
463 void
464 channel_send_namereply(struct Client *client, struct Channel *channel)
465 {
466 dlink_node *node;
467 char buf[IRCD_BUFSIZE + 1];
468 char *bufptr = buf;
469 size_t masklen = 0;
470 bool is_member = member_find_link(client, channel) != NULL;
471 bool multi_prefix = HasCap(client, CAP_MULTI_PREFIX) != 0;
472 bool uhnames = HasCap(client, CAP_UHNAMES) != 0;
473
474 assert(IsClient(client));
475
476 if (PubChannel(channel) || is_member == true)
477 {
478 /* :me.name 353 client->name @ channel->name :+nick1 @nick2 %nick3 ...\r\n */
479 /* 1 23456 789 01 2 3 */
480 size_t len = strlen(me.name) + strlen(client->name) + channel->name_len + 13;
481
482 DLINK_FOREACH(node, channel->members.head)
483 {
484 const struct ChannelMember *member = node->data;
485
486 if (HasUMode(member->client, UMODE_INVISIBLE) && is_member == false)
487 continue;
488
489 if (uhnames == true)
490 masklen = strlen(member->client->name) + strlen(member->client->username) +
491 strlen(member->client->host) + 3; /* +3 for ! + @ + space */
492 else
493 masklen = strlen(member->client->name) + 1; /* +1 for space */
494
495 masklen += member_get_prefix_len(member, multi_prefix);
496
497 if ((bufptr - buf) + masklen + len > sizeof(buf))
498 {
499 *(bufptr - 1) = '\0';
500 sendto_one_numeric(client, &me, RPL_NAMREPLY,
501 channel_pub_or_secret(channel), channel->name, buf);
502 bufptr = buf;
503 }
504
505 if (uhnames == true)
506 bufptr += snprintf(bufptr, sizeof(buf) - (bufptr - buf), "%s%s!%s@%s ",
507 member_get_prefix(member, multi_prefix),
508 member->client->name, member->client->username,
509 member->client->host);
510 else
511 bufptr += snprintf(bufptr, sizeof(buf) - (bufptr - buf), "%s%s ",
512 member_get_prefix(member, multi_prefix),
513 member->client->name);
514 }
515
516 if (bufptr != buf)
517 {
518 *(bufptr - 1) = '\0';
519 sendto_one_numeric(client, &me, RPL_NAMREPLY,
520 channel_pub_or_secret(channel), channel->name, buf);
521 }
522 }
523
524 sendto_one_numeric(client, &me, RPL_ENDOFNAMES, channel->name);
525 }
526
527 /* member_get_prefix()
528 *
529 * inputs - pointer to struct ChannelMember
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 client_get_name)
537 */
538 const char *
539 member_get_prefix(const struct ChannelMember *member, bool combine)
540 {
541 static char buf[CMEMBER_STATUS_FLAGS_LEN + 1]; /* +1 for \0 */
542 char *bufptr = buf;
543
544 if (member->flags & CHFL_CHANOP)
545 {
546 if (combine == false)
547 return "@";
548 *bufptr++ = '@';
549 }
550
551 if (member->flags & CHFL_HALFOP)
552 {
553 if (combine == false)
554 return "%";
555 *bufptr++ = '%';
556 }
557
558 if (member->flags & CHFL_VOICE)
559 *bufptr++ = '+';
560 *bufptr = '\0';
561
562 return buf;
563 }
564
565 size_t
566 member_get_prefix_len(const struct ChannelMember *member, bool combine)
567 {
568 size_t len = 0;
569
570 if (member->flags & CHFL_CHANOP)
571 {
572 if (combine == false)
573 return 1;
574 ++len;
575 }
576
577 if (member->flags & CHFL_HALFOP)
578 {
579 if (combine == false)
580 return 1;
581 ++len;
582 }
583
584 if (member->flags & CHFL_VOICE)
585 {
586 if (combine == false)
587 return 1;
588 ++len;
589 }
590
591 return len;
592 }
593
594 /*!
595 * \param client Pointer to Client to check
596 * \param list Pointer to ban list to search
597 * \return true if ban found for given n!u\@h mask, false otherwise
598 */
599 static bool
600 ban_matches(struct Client *client, struct Channel *channel, struct Ban *ban)
601 {
602 /* Is a matching extban, call custom match handler */
603 if (ban->extban & extban_matching_mask())
604 {
605 struct Extban *extban = extban_find_flag(ban->extban & extban_matching_mask());
606 if (extban == NULL)
607 return false;
608
609 if (extban->matches == NULL || extban->matches(client, channel, ban) == EXTBAN_NO_MATCH)
610 return false;
611
612 return true;
613 }
614
615 if (match(ban->name, client->name) == 0 && match(ban->user, client->username) == 0)
616 {
617 switch (ban->type)
618 {
619 case HM_HOST:
620 if (match(ban->host, client->realhost) == 0 ||
621 match(ban->host, client->sockhost) == 0 || match(ban->host, client->host) == 0)
622 return true;
623 break;
624 case HM_IPV6:
625 case HM_IPV4:
626 if (address_compare(&client->ip, &ban->addr, false, false, ban->bits) == true)
627 return true;
628 break;
629 default:
630 assert(0);
631 }
632 }
633
634 return false;
635 }
636
637 bool
638 find_bmask(struct Client *client, struct Channel *channel, const dlink_list *list, struct Extban *extban)
639 {
640 dlink_node *node;
641
642 DLINK_FOREACH(node, list->head)
643 {
644 struct Ban *ban = node->data;
645
646 /* Looking for a specific type of extban? */
647 if (extban)
648 {
649 if (!(ban->extban & extban->flag))
650 continue;
651 }
652 else
653 {
654 /*
655 * Acting extbans have their own time they act and are not general purpose bans,
656 * so skip them unless we are hunting them.
657 */
658 if (ban->extban & extban_acting_mask())
659 continue;
660 }
661
662 bool matches = ban_matches(client, channel, ban);
663 if (matches == false)
664 continue;
665
666 return true;
667 }
668
669 return false;
670 }
671
672 /*!
673 * \param channel Pointer to channel block
674 * \param client Pointer to client to check access fo
675 * \return false if not banned, true otherwise
676 */
677 bool
678 is_banned(struct Channel *channel, struct Client *client)
679 {
680 if (find_bmask(client, channel, &channel->banlist, NULL) == true)
681 return find_bmask(client, channel, &channel->exceptlist, NULL) == false;
682 return false;
683 }
684
685 /*! Tests if a client can join a certain channel
686 * \param client Pointer to client attempting to join
687 * \param channel Pointer to channel
688 * \param key Key sent by client attempting to join if present
689 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
690 * or 0 if allowed to join.
691 */
692 static int
693 can_join(struct Client *client, struct Channel *channel, const char *key)
694 {
695 if (HasCMode(channel, MODE_SECUREONLY) && !HasUMode(client, UMODE_SECURE))
696 return ERR_SECUREONLYCHAN;
697
698 if (HasCMode(channel, MODE_REGONLY) && !HasUMode(client, UMODE_REGISTERED))
699 return ERR_NEEDREGGEDNICK;
700
701 if (HasCMode(channel, MODE_OPERONLY) && !HasUMode(client, UMODE_OPER))
702 return ERR_OPERONLYCHAN;
703
704 if (HasCMode(channel, MODE_INVITEONLY))
705 if (invite_find(channel, client) == NULL)
706 if (find_bmask(client, channel, &channel->invexlist, NULL) == false)
707 return ERR_INVITEONLYCHAN;
708
709 if (channel->mode.key[0] && (key == NULL || strcmp(channel->mode.key, key)))
710 return ERR_BADCHANNELKEY;
711
712 if (channel->mode.limit && dlink_list_length(&channel->members) >=
713 channel->mode.limit)
714 return ERR_CHANNELISFULL;
715
716 if (is_banned(channel, client) == true)
717 return ERR_BANNEDFROMCHAN;
718
719 return extban_join_can_join(channel, client, NULL);
720 }
721
722 bool
723 member_has_flags(const struct ChannelMember *member, const unsigned int flags)
724 {
725 if (member && (member->flags & flags))
726 return true;
727 return false;
728 }
729
730 struct ChannelMember *
731 member_find_link(const struct Client *client, const struct Channel *channel)
732 {
733 dlink_node *node;
734
735 if (!IsClient(client))
736 return NULL;
737
738 /* Take the shortest of the two lists */
739 if (dlink_list_length(&channel->members) < dlink_list_length(&client->channel))
740 {
741 DLINK_FOREACH(node, channel->members.head)
742 if (((struct ChannelMember *)node->data)->client == client)
743 return node->data;
744 }
745 else
746 {
747 DLINK_FOREACH(node, client->channel.head)
748 if (((struct ChannelMember *)node->data)->channel == channel)
749 return node->data;
750 }
751
752 return NULL;
753 }
754
755 /*! Checks if a message contains control codes
756 * \param message The actual message string the client wants to send
757 * \return true if the message does contain any control codes, false otherwise
758 */
759 static bool
760 msg_has_ctrls(const char *message)
761 {
762 const unsigned char *p = (const unsigned char *)message;
763
764 for (; *p; ++p)
765 {
766 if (*p > 31 || *p == 1)
767 continue; /* No control code or CTCP */
768
769 if (*p == 27) /* Escape */
770 {
771 /* ISO 2022 charset shift sequence */
772 if (*(p + 1) == '$' ||
773 *(p + 1) == '(')
774 {
775 ++p;
776 continue;
777 }
778 }
779
780 return true; /* Control code */
781 }
782
783 return false; /* No control code found */
784 }
785
786 /*! Tests if a client can send to a channel
787 * \param channel Pointer to Channel struct
788 * \param client Pointer to Client struct
789 * \param member Pointer to Membership struct (can be NULL)
790 * \param message The actual message string the client wants to send
791 * \return CAN_SEND_OPV if op or voiced on channel\n
792 * CAN_SEND_NONOP if can send to channel but is not an op\n
793 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
794 */
795 int
796 can_send(struct Channel *channel, struct Client *client,
797 struct ChannelMember *member, const char *message, bool notice)
798 {
799 const struct ResvItem *resv;
800
801 if (IsServer(client) || HasFlag(client, FLAGS_SERVICE))
802 return CAN_SEND_OPV;
803
804 if (MyConnect(client) && !HasFlag(client, FLAGS_EXEMPTRESV))
805 if (!(HasUMode(client, UMODE_OPER) && HasOFlag(client, OPER_FLAG_JOIN_RESV)))
806 if ((resv = resv_find(channel->name, match)) && resv_exempt_find(client, resv) == false)
807 return ERR_CANNOTSENDTOCHAN;
808
809 if (HasCMode(channel, MODE_NOCTRL) && msg_has_ctrls(message) == true)
810 return ERR_NOCTRLSONCHAN;
811
812 if (HasCMode(channel, MODE_NOCTCP))
813 if (*message == '\001' && strncmp(message + 1, "ACTION ", 7))
814 return ERR_NOCTCP;
815
816 if (member || (member = member_find_link(client, channel)))
817 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
818 return CAN_SEND_OPV;
819
820 if (member == NULL && HasCMode(channel, MODE_NOPRIVMSGS))
821 return ERR_CANNOTSENDTOCHAN;
822
823 if (HasCMode(channel, MODE_MODERATED))
824 return ERR_CANNOTSENDTOCHAN;
825
826 if (HasCMode(channel, MODE_MODREG) && !HasUMode(client, UMODE_REGISTERED))
827 return ERR_NEEDREGGEDNICK;
828
829 if (HasCMode(channel, MODE_NONOTICE) && notice == true)
830 return ERR_CANNOTSENDTOCHAN;
831
832 /* Cache can send if banned */
833 if (MyConnect(client))
834 {
835 if (member)
836 {
837 if (member->flags & CHFL_BAN_SILENCED)
838 return ERR_CANNOTSENDTOCHAN;
839
840 if (!(member->flags & CHFL_BAN_CHECKED))
841 {
842 if (is_banned(channel, client) == true)
843 {
844 member->flags |= (CHFL_BAN_CHECKED | CHFL_BAN_SILENCED);
845 return ERR_CANNOTSENDTOCHAN;
846 }
847
848 member->flags |= CHFL_BAN_CHECKED;
849 }
850 }
851 else if (is_banned(channel, client) == true)
852 return ERR_CANNOTSENDTOCHAN;
853 }
854
855 return extban_mute_can_send(channel, client, member);
856 }
857
858 /*! \brief Updates the client's oper_warn_count_down, warns the
859 * IRC operators if necessary, and updates
860 * join_leave_countdown as needed.
861 * \param client Pointer to struct Client to check
862 * \param name Channel name or NULL if this is a part.
863 */
864 void
865 check_spambot_warning(struct Client *client, const char *name)
866 {
867 if (GlobalSetOptions.spam_num &&
868 (client->connection->join_leave_count >= GlobalSetOptions.spam_num))
869 {
870 if (client->connection->oper_warn_count_down)
871 --client->connection->oper_warn_count_down;
872
873 if (client->connection->oper_warn_count_down == 0)
874 {
875 client->connection->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
876
877 /* It's already known as a possible spambot */
878 if (name)
879 sendto_realops_flags(UMODE_FLOOD, L_ALL, SEND_NOTICE,
880 "User %s (%s@%s) trying to join %s is a possible spambot",
881 client->name, client->username,
882 client->host, name);
883 else
884 sendto_realops_flags(UMODE_FLOOD, L_ALL, SEND_NOTICE,
885 "User %s (%s@%s) is a possible spambot",
886 client->name, client->username,
887 client->host);
888 }
889 }
890 else
891 {
892 unsigned int t_delta = event_base->time.sec_monotonic - client->connection->last_leave_time;
893 if (t_delta > JOIN_LEAVE_COUNT_EXPIRE_TIME)
894 {
895 unsigned int decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
896 if (decrement_count > client->connection->join_leave_count)
897 client->connection->join_leave_count = 0;
898 else
899 client->connection->join_leave_count -= decrement_count;
900 }
901 else
902 {
903 if ((event_base->time.sec_monotonic - client->connection->last_join_time) < GlobalSetOptions.spam_time)
904 ++client->connection->join_leave_count; /* It's a possible spambot */
905 }
906
907 if (name)
908 client->connection->last_join_time = event_base->time.sec_monotonic;
909 else
910 client->connection->last_leave_time = event_base->time.sec_monotonic;
911 }
912 }
913
914 /*! \brief Sets the channel topic for a certain channel
915 * \param channel Pointer to struct Channel
916 * \param topic The topic string
917 * \param topic_info n!u\@h formatted string of the topic setter
918 * \param topicts Timestamp on the topic
919 * \param local Whether the topic is set by a local client
920 */
921 void
922 channel_set_topic(struct Channel *channel, const char *topic,
923 const char *topic_info, uintmax_t topicts, bool local)
924 {
925 if (local == true)
926 strlcpy(channel->topic, topic, IRCD_MIN(sizeof(channel->topic), ConfigServerInfo.max_topic_length + 1));
927 else
928 strlcpy(channel->topic, topic, sizeof(channel->topic));
929
930 strlcpy(channel->topic_info, topic_info, sizeof(channel->topic_info));
931 channel->topic_time = topicts;
932 }
933
934 void
935 channel_do_join(struct Client *client, char *chan_list, char *key_list)
936 {
937 char *p = NULL;
938 const struct ResvItem *resv = NULL;
939 const struct ClassItem *const class = class_get_ptr(&client->connection->confs);
940 unsigned int flags = 0;
941
942 assert(MyClient(client));
943
944 for (const char *name = strtok_r(chan_list, ",", &p); name;
945 name = strtok_r(NULL, ",", &p))
946 {
947 const char *key = NULL;
948
949 /* If we have any more keys, take the first for this channel. */
950 if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
951 *key_list++ = '\0';
952
953 /* Empty keys are the same as no keys. */
954 if (key && *key == '\0')
955 key = NULL;
956
957 if (channel_check_name(name, true) == false)
958 {
959 sendto_one_numeric(client, &me, ERR_BADCHANNAME, name);
960 continue;
961 }
962
963 if (!HasFlag(client, FLAGS_EXEMPTRESV) &&
964 !(HasUMode(client, UMODE_OPER) && HasOFlag(client, OPER_FLAG_JOIN_RESV)) &&
965 ((resv = resv_find(name, match)) && resv_exempt_find(client, resv) == false))
966 {
967 sendto_one_numeric(client, &me, ERR_CHANBANREASON, name, resv->reason);
968 sendto_realops_flags(UMODE_REJ, L_ALL, SEND_NOTICE,
969 "Forbidding reserved channel %s from user %s",
970 name, client_get_name(client, HIDE_IP));
971 continue;
972 }
973
974 if (dlink_list_length(&client->channel) >=
975 ((class->max_channels) ? class->max_channels : ConfigChannel.max_channels))
976 {
977 sendto_one_numeric(client, &me, ERR_TOOMANYCHANNELS, name);
978 break;
979 }
980
981 struct Channel *channel = hash_find_channel(name);
982 if (channel)
983 {
984 if (member_find_link(client, channel))
985 continue;
986
987 /* can_join() checks for +i, +l, key, bans, etc. */
988 int ret = can_join(client, channel, key);
989 if (ret)
990 {
991 sendto_one_numeric(client, &me, ret, channel->name);
992 continue;
993 }
994
995 /*
996 * This should never be the case unless there is some sort of
997 * persistent channels.
998 */
999 if (dlink_list_length(&channel->members) == 0)
1000 flags = CHFL_CHANOP;
1001 else
1002 flags = 0;
1003 }
1004 else
1005 {
1006 flags = CHFL_CHANOP;
1007 channel = channel_make(name);
1008 }
1009
1010 if (!HasUMode(client, UMODE_OPER))
1011 check_spambot_warning(client, channel->name);
1012
1013 add_user_to_channel(channel, client, flags, true);
1014
1015 /*
1016 * Set timestamp if appropriate, and propagate
1017 */
1018 if (flags == CHFL_CHANOP)
1019 {
1020 channel->creation_time = event_base->time.sec_real;
1021 AddCMode(channel, MODE_TOPICLIMIT);
1022 AddCMode(channel, MODE_NOPRIVMSGS);
1023
1024 sendto_server(NULL, 0, 0, ":%s SJOIN %ju %s +nt :@%s",
1025 me.id, channel->creation_time,
1026 channel->name, client->id);
1027
1028 /*
1029 * Notify all other users on the new channel
1030 */
1031 sendto_channel_local(NULL, channel, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1032 client->name, client->username,
1033 client->host, channel->name, client->account, client->info);
1034 sendto_channel_local(NULL, channel, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1035 client->name, client->username,
1036 client->host, channel->name);
1037 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s +nt",
1038 me.name, channel->name);
1039 }
1040 else
1041 {
1042 sendto_server(NULL, 0, 0, ":%s JOIN %ju %s +",
1043 client->id, channel->creation_time,
1044 channel->name);
1045
1046 sendto_channel_local(NULL, channel, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1047 client->name, client->username,
1048 client->host, channel->name, client->account, client->info);
1049 sendto_channel_local(NULL, channel, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1050 client->name, client->username,
1051 client->host, channel->name);
1052 }
1053
1054 if (client->away[0])
1055 sendto_channel_local(client, channel, 0, CAP_AWAY_NOTIFY, 0,
1056 ":%s!%s@%s AWAY :%s",
1057 client->name, client->username,
1058 client->host, client->away);
1059
1060 struct Invite *invite = invite_find(channel, client);
1061 if (invite)
1062 invite_del(invite);
1063
1064 if (channel->topic[0])
1065 {
1066 sendto_one_numeric(client, &me, RPL_TOPIC, channel->name, channel->topic);
1067 sendto_one_numeric(client, &me, RPL_TOPICWHOTIME, channel->name,
1068 channel->topic_info, channel->topic_time);
1069 }
1070
1071 channel_send_namereply(client, channel);
1072
1073 client->connection->last_join_time = event_base->time.sec_monotonic;
1074 }
1075 }
1076
1077 /*! \brief Removes a client from a specific channel
1078 * \param client Pointer to client to remove
1079 * \param name Name of channel to remove from
1080 * \param reason Part reason to show
1081 */
1082 static void
1083 channel_part_one_client(struct Client *client, const char *name, const char *reason)
1084 {
1085 struct Channel *channel = hash_find_channel(name);
1086 if (channel == NULL)
1087 {
1088 sendto_one_numeric(client, &me, ERR_NOSUCHCHANNEL, name);
1089 return;
1090 }
1091
1092 struct ChannelMember *member = member_find_link(client, channel);
1093 if (member == NULL)
1094 {
1095 sendto_one_numeric(client, &me, ERR_NOTONCHANNEL, channel->name);
1096 return;
1097 }
1098
1099 if (MyConnect(client) && !HasUMode(client, UMODE_OPER))
1100 check_spambot_warning(client, NULL);
1101
1102 /*
1103 * Remove user from the old channel (if any). Only allow /part reasons in -m chans.
1104 */
1105 if (*reason && (!MyConnect(client) ||
1106 ((client->connection->created_monotonic +
1107 ConfigGeneral.anti_spam_exit_message_time) < event_base->time.sec_monotonic &&
1108 can_send(channel, client, member, reason, false) < 0)))
1109 {
1110 sendto_server(client, 0, 0, ":%s PART %s :%s",
1111 client->id, channel->name, reason);
1112 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s PART %s :%s",
1113 client->name, client->username,
1114 client->host, channel->name, reason);
1115 }
1116 else
1117 {
1118 sendto_server(client, 0, 0, ":%s PART %s",
1119 client->id, channel->name);
1120 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s PART %s",
1121 client->name, client->username,
1122 client->host, channel->name);
1123 }
1124
1125 remove_user_from_channel(member);
1126 }
1127
1128 void
1129 channel_do_part(struct Client *client, char *channel, const char *reason)
1130 {
1131 char *p = NULL;
1132 char buf[KICKLEN + 1] = ""; /* Essential that buf[0] = '\0' */
1133
1134 assert(IsClient(client));
1135
1136 if (!EmptyString(reason))
1137 strlcpy(buf, reason, sizeof(buf));
1138
1139 for (const char *name = strtok_r(channel, ",", &p); name;
1140 name = strtok_r(NULL, ",", &p))
1141 channel_part_one_client(client, name, buf);
1142 }

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