/[svn]/ircd-hybrid/trunk/src/channel.c
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Contents of /ircd-hybrid/trunk/src/channel.c

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Revision 9476 - (show annotations)
Sat Jul 4 15:26:19 2020 UTC (2 months, 2 weeks ago) by michael
File MIME type: text/x-chdr
File size: 33457 byte(s)
- channel.c:channel_send_namereply(): remove show_eon argument. In hybrid we no longer have a case where a names reply needs to be sent with no RPL_ENDOFNAMES

1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 1997-2020 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_BOTS, 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, unsigned int mask, const char flag)
149 {
150 dlink_node *node;
151 char modebuf[MODEBUFLEN];
152 char parabuf[MODEBUFLEN];
153 char *mbuf = modebuf;
154 char *pbuf = modebuf;
155 const char *names[MAXMODEPARAMS];
156 static const unsigned int names_size = sizeof(names) / sizeof(names[0]);
157 unsigned int count = 0;
158
159 DLINK_FOREACH(node, channel->members.head)
160 {
161 struct ChannelMember *member = node->data;
162
163 if ((member->flags & mask) == 0)
164 continue;
165
166 member->flags &= ~mask;
167
168 names[count++] = member->client->name;
169
170 *mbuf++ = flag;
171
172 if (count >= names_size)
173 {
174 *mbuf = '\0';
175
176 for (unsigned int i = 0; i < names_size; ++i)
177 pbuf += snprintf(pbuf, sizeof(parabuf) - (pbuf - parabuf), " %s", names[i]);
178
179 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s -%s%s",
180 client->name, channel->name, modebuf, parabuf);
181 mbuf = modebuf;
182 pbuf = parabuf;
183 count = 0;
184 }
185 }
186
187 if (count)
188 {
189 assert(count < names_size);
190 *mbuf = '\0';
191
192 for (unsigned int i = 0; i < count; ++i)
193 pbuf += snprintf(pbuf, sizeof(parabuf) - (pbuf - parabuf), " %s", names[i]);
194
195 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s -%s%s",
196 client->name, channel->name, modebuf, parabuf);
197 }
198 }
199
200 /* channel_send_members()
201 *
202 * inputs -
203 * output - NONE
204 * side effects -
205 */
206 static void
207 channel_send_members(struct Client *client, const struct Channel *channel,
208 const char *modebuf, const char *parabuf)
209 {
210 dlink_node *node;
211 char buf[IRCD_BUFSIZE];
212 int tlen; /* length of text to append */
213 char *t, *start; /* temp char pointer */
214
215 start = t = buf + snprintf(buf, sizeof(buf), ":%s SJOIN %ju %s %s %s:",
216 me.id, channel->creation_time,
217 channel->name, modebuf, parabuf);
218
219 DLINK_FOREACH(node, channel->members.head)
220 {
221 const struct ChannelMember *member = node->data;
222
223 tlen = strlen(member->client->id) + 1; /* +1 for space */
224 tlen += member_get_prefix_len(member, true);
225
226 /*
227 * Space will be converted into CR, but we also need space for LF..
228 * That's why we use '- 1' here -adx
229 */
230 if (t + tlen - buf > IRCD_BUFSIZE - 1)
231 {
232 *(t - 1) = '\0'; /* Kill the space and terminate the string */
233 sendto_one(client, "%s", buf);
234 t = start;
235 }
236
237 t += snprintf(t, sizeof(buf) - (t - buf), "%s%s ", member_get_prefix(member, true), member->client->id);
238 }
239
240 /* Should always be non-NULL unless we have a kind of persistent channels */
241 if (channel->members.head)
242 --t; /* Take the space out */
243 *t = '\0';
244 sendto_one(client, "%s", buf);
245 }
246
247 /*! \brief Sends +b/+e/+I
248 * \param client Client pointer to server
249 * \param channel Pointer to channel
250 * \param list Pointer to list of modes to send
251 * \param flag Char flag flagging type of mode. Currently this can be 'b', e' or 'I'
252 */
253 static void
254 channel_send_mask_list(struct Client *client, const struct Channel *channel,
255 const dlink_list *list, const char flag)
256 {
257 dlink_node *node;
258 char mbuf[IRCD_BUFSIZE];
259 char pbuf[IRCD_BUFSIZE];
260 size_t tlen, mlen, cur_len;
261 char *pp = pbuf;
262
263 if (dlink_list_length(list) == 0)
264 return;
265
266 mlen = snprintf(mbuf, sizeof(mbuf), ":%s BMASK %ju %s %c :", me.id,
267 channel->creation_time, channel->name, flag);
268 cur_len = mlen;
269
270 DLINK_FOREACH(node, list->head)
271 {
272 const struct Ban *ban = node->data;
273
274 tlen = ban->banstr_len + 1; /* +1 for space */
275
276 /*
277 * Send buffer and start over if we cannot fit another ban
278 */
279 if (cur_len + (tlen - 1) > sizeof(pbuf) - 2)
280 {
281 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
282 sendto_one(client, "%s%s", mbuf, pbuf);
283
284 cur_len = mlen;
285 pp = pbuf;
286 }
287
288 pp += snprintf(pp, sizeof(pbuf) - (pp - pbuf), "%s ", ban->banstr);
289 cur_len += tlen;
290 }
291
292 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
293 sendto_one(client, "%s%s", mbuf, pbuf);
294 }
295
296 /*! \brief Send "client" a full list of the modes for channel channel
297 * \param client Pointer to client client
298 * \param channel Pointer to channel pointer
299 */
300 void
301 channel_send_modes(struct Client *client, const struct Channel *channel)
302 {
303 char modebuf[MODEBUFLEN] = "";
304 char parabuf[MODEBUFLEN] = "";
305
306 channel_modes(channel, client, modebuf, parabuf);
307 channel_send_members(client, channel, modebuf, parabuf);
308
309 channel_send_mask_list(client, channel, &channel->banlist, 'b');
310 channel_send_mask_list(client, channel, &channel->exceptlist, 'e');
311 channel_send_mask_list(client, channel, &channel->invexlist, 'I');
312 }
313
314 /*! \brief Check channel name for invalid characters
315 * \param name Pointer to channel name string
316 * \param local Indicates whether it's a local or remote creation
317 * \return 0 if invalid, 1 otherwise
318 */
319 bool
320 channel_check_name(const char *name, bool local)
321 {
322 const char *p = name;
323
324 assert(!EmptyString(p));
325
326 if (!IsChanPrefix(*p))
327 return false;
328
329 if (local == false || ConfigChannel.disable_fake_channels == 0)
330 {
331 while (*++p)
332 if (!IsChanChar(*p))
333 return false;
334 }
335 else
336 {
337 while (*++p)
338 if (!IsVisibleChanChar(*p))
339 return false;
340 }
341
342 return p - name <= CHANNELLEN;
343 }
344
345 void
346 remove_ban(struct Ban *ban, dlink_list *list)
347 {
348 dlinkDelete(&ban->node, list);
349 xfree(ban);
350 }
351
352 /* channel_free_mask_list()
353 *
354 * inputs - pointer to dlink_list
355 * output - NONE
356 * side effects -
357 */
358 static void
359 channel_free_mask_list(dlink_list *list)
360 {
361 while (list->head)
362 {
363 struct Ban *ban = list->head->data;
364 remove_ban(ban, list);
365 }
366 }
367
368 /*! \brief Get Channel block for name (and allocate a new channel
369 * block, if it didn't exist before)
370 * \param name Channel name
371 * \return Channel block
372 */
373 struct Channel *
374 channel_make(const char *name)
375 {
376 assert(!EmptyString(name));
377
378 struct Channel *channel = xcalloc(sizeof(*channel));
379 channel->hnextch = channel;
380 /* Doesn't hurt to set it here */
381 channel->creation_time = event_base->time.sec_real;
382 channel->last_join_time = event_base->time.sec_monotonic;
383
384 /* Cache channel name length to avoid repetitive strlen() calls. */
385 channel->name_len = strlcpy(channel->name, name, sizeof(channel->name));
386 if (channel->name_len >= sizeof(channel->name))
387 channel->name_len = sizeof(channel->name) - 1;
388
389 dlinkAdd(channel, &channel->node, &channel_list);
390 hash_add_channel(channel);
391
392 return channel;
393 }
394
395 /*! \brief Walk through this channel, and destroy it.
396 * \param channel Channel pointer
397 */
398 void
399 channel_free(struct Channel *channel)
400 {
401 invite_clear_list(&channel->invites);
402
403 /* Free ban/exception/invex lists */
404 channel_free_mask_list(&channel->banlist);
405 channel_free_mask_list(&channel->exceptlist);
406 channel_free_mask_list(&channel->invexlist);
407
408 dlinkDelete(&channel->node, &channel_list);
409 hash_del_channel(channel);
410
411 assert(channel->hnextch == channel);
412
413 assert(channel->node.prev == NULL);
414 assert(channel->node.next == NULL);
415
416 assert(dlink_list_length(&channel->members_local) == 0);
417 assert(channel->members_local.head == NULL);
418 assert(channel->members_local.tail == NULL);
419
420 assert(dlink_list_length(&channel->members) == 0);
421 assert(channel->members.head == NULL);
422 assert(channel->members.tail == NULL);
423
424 assert(dlink_list_length(&channel->invites) == 0);
425 assert(channel->invites.head == NULL);
426 assert(channel->invites.tail == NULL);
427
428 assert(dlink_list_length(&channel->banlist) == 0);
429 assert(channel->banlist.head == NULL);
430 assert(channel->banlist.tail == NULL);
431
432 assert(dlink_list_length(&channel->exceptlist) == 0);
433 assert(channel->exceptlist.head == NULL);
434 assert(channel->exceptlist.tail == NULL);
435
436 assert(dlink_list_length(&channel->invexlist) == 0);
437 assert(channel->invexlist.head == NULL);
438 assert(channel->invexlist.tail == NULL);
439
440 xfree(channel);
441 }
442
443 /*!
444 * \param channel Pointer to channel
445 * \return String pointer "=" if public, "@" if secret else "*"
446 */
447 static const char *
448 channel_pub_or_secret(const struct Channel *channel)
449 {
450 if (SecretChannel(channel))
451 return "@";
452 if (PrivateChannel(channel))
453 return "*";
454 return "=";
455 }
456
457 /*! \brief lists all names on given channel
458 * \param client Pointer to client struct requesting names
459 * \param channel Pointer to channel block
460 */
461 void
462 channel_send_namereply(struct Client *client, struct Channel *channel)
463 {
464 dlink_node *node;
465 char buf[IRCD_BUFSIZE + 1];
466 char *bufptr = buf;
467 size_t masklen = 0;
468 bool is_member = member_find_link(client, channel) != NULL;
469 bool multi_prefix = HasCap(client, CAP_MULTI_PREFIX) != 0;
470 bool uhnames = HasCap(client, CAP_UHNAMES) != 0;
471
472 assert(IsClient(client));
473
474 if (PubChannel(channel) || is_member == true)
475 {
476 /* :me.name 353 source_p->name @ channel->name :+nick1 @nick2 %nick3 ...\r\n */
477 /* 1 23456 789 01 2 3 */
478 size_t len = strlen(me.name) + strlen(client->name) + channel->name_len + 13;
479
480 DLINK_FOREACH(node, channel->members.head)
481 {
482 const struct ChannelMember *member = node->data;
483
484 if (HasUMode(member->client, UMODE_INVISIBLE) && is_member == false)
485 continue;
486
487 if (uhnames == true)
488 masklen = strlen(member->client->name) + strlen(member->client->username) +
489 strlen(member->client->host) + 3; /* +3 for ! + @ + space */
490 else
491 masklen = strlen(member->client->name) + 1; /* +1 for space */
492
493 masklen += member_get_prefix_len(member, multi_prefix);
494
495 if ((bufptr - buf) + masklen + len > sizeof(buf))
496 {
497 *(bufptr - 1) = '\0';
498 sendto_one_numeric(client, &me, RPL_NAMREPLY,
499 channel_pub_or_secret(channel), channel->name, buf);
500 bufptr = buf;
501 }
502
503 if (uhnames == true)
504 bufptr += snprintf(bufptr, sizeof(buf) - (bufptr - buf), "%s%s!%s@%s ",
505 member_get_prefix(member, multi_prefix),
506 member->client->name, member->client->username,
507 member->client->host);
508 else
509 bufptr += snprintf(bufptr, sizeof(buf) - (bufptr - buf), "%s%s ",
510 member_get_prefix(member, multi_prefix),
511 member->client->name);
512 }
513
514 if (bufptr != buf)
515 {
516 *(bufptr - 1) = '\0';
517 sendto_one_numeric(client, &me, RPL_NAMREPLY,
518 channel_pub_or_secret(channel), channel->name, buf);
519 }
520 }
521
522 sendto_one_numeric(client, &me, RPL_ENDOFNAMES, channel->name);
523 }
524
525 /* member_get_prefix()
526 *
527 * inputs - pointer to struct ChannelMember
528 * - YES if we can combine different flags
529 * output - string either @, +, % or "" depending on whether
530 * chanop, voiced or user
531 * side effects -
532 *
533 * NOTE: Returned string is usually a static buffer
534 * (like in client_get_name)
535 */
536 const char *
537 member_get_prefix(const struct ChannelMember *member, bool combine)
538 {
539 static char buffer[CMEMBER_STATUS_FLAGS_LEN + 1]; /* +1 for \0 */
540 char *p = buffer;
541
542 if (member->flags & CHFL_CHANOP)
543 {
544 if (combine == false)
545 return "@";
546 *p++ = '@';
547 }
548
549 if (member->flags & CHFL_HALFOP)
550 {
551 if (combine == false)
552 return "%";
553 *p++ = '%';
554 }
555
556 if (member->flags & CHFL_VOICE)
557 *p++ = '+';
558 *p = '\0';
559
560 return buffer;
561 }
562
563 size_t
564 member_get_prefix_len(const struct ChannelMember *member, bool combine)
565 {
566 size_t len = 0;
567
568 if (member->flags & CHFL_CHANOP)
569 {
570 if (combine == false)
571 return 1;
572 ++len;
573 }
574
575 if (member->flags & CHFL_HALFOP)
576 {
577 if (combine == false)
578 return 1;
579 ++len;
580 }
581
582 if (member->flags & CHFL_VOICE)
583 {
584 if (combine == false)
585 return 1;
586 ++len;
587 }
588
589 return len;
590 }
591
592 /*!
593 * \param client Pointer to Client to check
594 * \param list Pointer to ban list to search
595 * \return 1 if ban found for given n!u\@h mask, 0 otherwise
596 */
597 static bool
598 ban_matches(struct Client *client, struct Channel *channel, struct Ban *ban)
599 {
600 /* Is a matching extban, call custom match handler */
601 if (ban->extban & extban_matching_mask())
602 {
603 struct Extban *extban = extban_find_flag(ban->extban & extban_matching_mask());
604 if (extban == NULL)
605 return false;
606
607 if (extban->matches == NULL || extban->matches(client, channel, ban) == EXTBAN_NO_MATCH)
608 return false;
609
610 return true;
611 }
612
613 if (match(ban->name, client->name) == 0 && match(ban->user, client->username) == 0)
614 {
615 switch (ban->type)
616 {
617 case HM_HOST:
618 if (match(ban->host, client->realhost) == 0 ||
619 match(ban->host, client->sockhost) == 0 || match(ban->host, client->host) == 0)
620 return true;
621 break;
622 case HM_IPV4:
623 if (client->ip.ss.ss_family == AF_INET)
624 if (match_ipv4(&client->ip, &ban->addr, ban->bits))
625 return true;
626 break;
627 case HM_IPV6:
628 if (client->ip.ss.ss_family == AF_INET6)
629 if (match_ipv6(&client->ip, &ban->addr, ban->bits))
630 return true;
631 break;
632 default:
633 assert(0);
634 }
635 }
636
637 return false;
638 }
639
640 bool
641 find_bmask(struct Client *client, struct Channel *channel, const dlink_list *list, struct Extban *extban)
642 {
643 dlink_node *node;
644
645 DLINK_FOREACH(node, list->head)
646 {
647 struct Ban *ban = node->data;
648
649 /* Looking for a specific type of extban? */
650 if (extban)
651 {
652 if (!(ban->extban & extban->flag))
653 continue;
654 }
655 else
656 {
657 /*
658 * Acting extbans have their own time they act and are not general purpose bans,
659 * so skip them unless we are hunting them.
660 */
661 if (ban->extban & extban_acting_mask())
662 continue;
663 }
664
665 bool matches = ban_matches(client, channel, ban);
666 if (matches == false)
667 continue;
668
669 return true;
670 }
671
672 return false;
673 }
674
675 /*!
676 * \param channel Pointer to channel block
677 * \param client Pointer to client to check access fo
678 * \return 0 if not banned, 1 otherwise
679 */
680 bool
681 is_banned(struct Channel *channel, struct Client *client)
682 {
683 if (find_bmask(client, channel, &channel->banlist, NULL) == true)
684 return find_bmask(client, channel, &channel->exceptlist, NULL) == false;
685 return false;
686 }
687
688 /*! Tests if a client can join a certain channel
689 * \param client Pointer to client attempting to join
690 * \param channel Pointer to channel
691 * \param key Key sent by client attempting to join if present
692 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
693 * or 0 if allowed to join.
694 */
695 static int
696 can_join(struct Client *client, struct Channel *channel, const char *key)
697 {
698 if (HasCMode(channel, MODE_SECUREONLY) && !HasUMode(client, UMODE_SECURE))
699 return ERR_SECUREONLYCHAN;
700
701 if (HasCMode(channel, MODE_REGONLY) && !HasUMode(client, UMODE_REGISTERED))
702 return ERR_NEEDREGGEDNICK;
703
704 if (HasCMode(channel, MODE_OPERONLY) && !HasUMode(client, UMODE_OPER))
705 return ERR_OPERONLYCHAN;
706
707 if (HasCMode(channel, MODE_INVITEONLY))
708 if (invite_find(channel, client) == NULL)
709 if (find_bmask(client, channel, &channel->invexlist, NULL) == false)
710 return ERR_INVITEONLYCHAN;
711
712 if (channel->mode.key[0] && (key == NULL || strcmp(channel->mode.key, key)))
713 return ERR_BADCHANNELKEY;
714
715 if (channel->mode.limit && dlink_list_length(&channel->members) >=
716 channel->mode.limit)
717 return ERR_CHANNELISFULL;
718
719 if (is_banned(channel, client) == true)
720 return ERR_BANNEDFROMCHAN;
721
722 return extban_join_can_join(channel, client, NULL);
723 }
724
725 int
726 has_member_flags(const struct ChannelMember *member, const unsigned int flags)
727 {
728 return member && (member->flags & flags);
729 }
730
731 struct ChannelMember *
732 member_find_link(const struct Client *client, const struct Channel *channel)
733 {
734 dlink_node *node;
735
736 if (!IsClient(client))
737 return NULL;
738
739 /* Take the shortest of the two lists */
740 if (dlink_list_length(&channel->members) < dlink_list_length(&client->channel))
741 {
742 DLINK_FOREACH(node, channel->members.head)
743 if (((struct ChannelMember *)node->data)->client == client)
744 return node->data;
745 }
746 else
747 {
748 DLINK_FOREACH(node, client->channel.head)
749 if (((struct ChannelMember *)node->data)->channel == channel)
750 return node->data;
751 }
752
753 return NULL;
754 }
755
756 /*! Checks if a message contains control codes
757 * \param message The actual message string the client wants to send
758 * \return 1 if the message does contain any control codes, 0 otherwise
759 */
760 static bool
761 msg_has_ctrls(const char *message)
762 {
763 const unsigned char *p = (const unsigned char *)message;
764
765 for (; *p; ++p)
766 {
767 if (*p > 31 || *p == 1)
768 continue; /* No control code or CTCP */
769
770 if (*p == 27) /* Escape */
771 {
772 /* ISO 2022 charset shift sequence */
773 if (*(p + 1) == '$' ||
774 *(p + 1) == '(')
775 {
776 ++p;
777 continue;
778 }
779 }
780
781 return true; /* Control code */
782 }
783
784 return false; /* No control code found */
785 }
786
787 /*! Tests if a client can send to a channel
788 * \param channel Pointer to Channel struct
789 * \param client Pointer to Client struct
790 * \param member Pointer to Membership struct (can be NULL)
791 * \param message The actual message string the client wants to send
792 * \return CAN_SEND_OPV if op or voiced on channel\n
793 * CAN_SEND_NONOP if can send to channel but is not an op\n
794 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
795 */
796 int
797 can_send(struct Channel *channel, struct Client *client,
798 struct ChannelMember *member, const char *message, bool notice)
799 {
800 const struct ResvItem *resv;
801
802 if (IsServer(client) || HasFlag(client, FLAGS_SERVICE))
803 return CAN_SEND_OPV;
804
805 if (MyConnect(client) && !HasFlag(client, FLAGS_EXEMPTRESV))
806 if (!(HasUMode(client, UMODE_OPER) && HasOFlag(client, OPER_FLAG_JOIN_RESV)))
807 if ((resv = resv_find(channel->name, match)) && resv_exempt_find(client, resv) == false)
808 return ERR_CANNOTSENDTOCHAN;
809
810 if (HasCMode(channel, MODE_NOCTRL) && msg_has_ctrls(message) == true)
811 return ERR_NOCTRLSONCHAN;
812
813 if (HasCMode(channel, MODE_NOCTCP))
814 if (*message == '\001' && strncmp(message + 1, "ACTION ", 7))
815 return ERR_NOCTCP;
816
817 if (member || (member = member_find_link(client, channel)))
818 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
819 return CAN_SEND_OPV;
820
821 if (member == NULL && HasCMode(channel, MODE_NOPRIVMSGS))
822 return ERR_CANNOTSENDTOCHAN;
823
824 if (HasCMode(channel, MODE_MODERATED))
825 return ERR_CANNOTSENDTOCHAN;
826
827 if (HasCMode(channel, MODE_MODREG) && !HasUMode(client, UMODE_REGISTERED))
828 return ERR_NEEDREGGEDNICK;
829
830 if (HasCMode(channel, MODE_NONOTICE) && notice == true)
831 return ERR_CANNOTSENDTOCHAN;
832
833 /* Cache can send if banned */
834 if (MyConnect(client))
835 {
836 if (member)
837 {
838 if (member->flags & CHFL_BAN_SILENCED)
839 return ERR_CANNOTSENDTOCHAN;
840
841 if (!(member->flags & CHFL_BAN_CHECKED))
842 {
843 if (is_banned(channel, client) == true)
844 {
845 member->flags |= (CHFL_BAN_CHECKED | CHFL_BAN_SILENCED);
846 return ERR_CANNOTSENDTOCHAN;
847 }
848
849 member->flags |= CHFL_BAN_CHECKED;
850 }
851 }
852 else if (is_banned(channel, client) == true)
853 return ERR_CANNOTSENDTOCHAN;
854 }
855
856 return extban_mute_can_send(channel, client, member);
857 }
858
859 /*! \brief Updates the client's oper_warn_count_down, warns the
860 * IRC operators if necessary, and updates
861 * join_leave_countdown as needed.
862 * \param client Pointer to struct Client to check
863 * \param name Channel name or NULL if this is a part.
864 */
865 void
866 check_spambot_warning(struct Client *client, const char *name)
867 {
868 if (GlobalSetOptions.spam_num &&
869 (client->connection->join_leave_count >= GlobalSetOptions.spam_num))
870 {
871 if (client->connection->oper_warn_count_down)
872 --client->connection->oper_warn_count_down;
873
874 if (client->connection->oper_warn_count_down == 0)
875 {
876 /* It's already known as a possible spambot */
877 if (name)
878 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
879 "User %s (%s@%s) trying to join %s is a possible spambot",
880 client->name, client->username,
881 client->host, name);
882 else
883 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
884 "User %s (%s@%s) is a possible spambot",
885 client->name, client->username,
886 client->host);
887 client->connection->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
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] = "";
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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