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root/svn/ircd-hybrid/branches/8.2.x/src/channel.c
Revision: 9216
Committed: Sun Jan 26 11:02:44 2020 UTC (4 years, 2 months ago) by michael
Content type: text/x-csrc
File size: 33212 byte(s)
Log Message:
- channel.c:find_bmask(): bmasks are now tested against x->realhost, too

File Contents

# Content
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_mode.h"
31 #include "client.h"
32 #include "hash.h"
33 #include "conf.h"
34 #include "conf_resv.h"
35 #include "hostmask.h"
36 #include "irc_string.h"
37 #include "ircd.h"
38 #include "numeric.h"
39 #include "server.h"
40 #include "send.h"
41 #include "event.h"
42 #include "memory.h"
43 #include "misc.h"
44
45
46 /** Doubly linked list containing a list of all channels. */
47 static dlink_list channel_list;
48
49
50 /*! \brief Returns the channel_list as constant
51 * \return channel_list
52 */
53 const dlink_list *
54 channel_get_list(void)
55 {
56 return &channel_list;
57 }
58
59 /*! \brief Adds a user to a channel by adding another link to the
60 * channels member chain.
61 * \param channel Pointer to channel to add client to
62 * \param client_p Pointer to client (who) to add
63 * \param flags Flags for chanops etc
64 * \param flood_ctrl Whether to count this join in flood calculations
65 */
66 void
67 add_user_to_channel(struct Channel *channel, struct Client *client_p,
68 unsigned int flags, bool flood_ctrl)
69 {
70 assert(IsClient(client_p));
71
72 if (GlobalSetOptions.joinfloodtime)
73 {
74 if (flood_ctrl == true)
75 ++channel->number_joined;
76
77 channel->number_joined -= (event_base->time.sec_monotonic - channel->last_join_time) *
78 (((float)GlobalSetOptions.joinfloodcount) /
79 (float)GlobalSetOptions.joinfloodtime);
80
81 if (channel->number_joined <= 0)
82 {
83 channel->number_joined = 0;
84 ClearJoinFloodNoticed(channel);
85 }
86 else if (channel->number_joined >= GlobalSetOptions.joinfloodcount)
87 {
88 channel->number_joined = GlobalSetOptions.joinfloodcount;
89
90 if (!IsSetJoinFloodNoticed(channel))
91 {
92 SetJoinFloodNoticed(channel);
93 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
94 "Possible Join Flooder %s on %s target: %s",
95 client_get_name(client_p, HIDE_IP),
96 client_p->servptr->name, channel->name);
97 }
98 }
99
100 channel->last_join_time = event_base->time.sec_monotonic;
101 }
102
103 struct ChannelMember *member = xcalloc(sizeof(*member));
104 member->client = client_p;
105 member->channel = channel;
106 member->flags = flags;
107
108 dlinkAdd(member, &member->channode, &channel->members);
109
110 if (MyConnect(client_p))
111 dlinkAdd(member, &member->locchannode, &channel->members_local);
112
113 dlinkAdd(member, &member->usernode, &client_p->channel);
114 }
115
116 /*! \brief Deletes an user from a channel by removing a link in the
117 * channels member chain.
118 * \param member Pointer to Membership struct
119 */
120 void
121 remove_user_from_channel(struct ChannelMember *member)
122 {
123 struct Client *const client_p = member->client;
124 struct Channel *const channel = member->channel;
125
126 dlinkDelete(&member->channode, &channel->members);
127
128 if (MyConnect(client_p))
129 dlinkDelete(&member->locchannode, &channel->members_local);
130
131 dlinkDelete(&member->usernode, &client_p->channel);
132
133 xfree(member);
134
135 if (channel->members.head == NULL)
136 channel_free(channel);
137 }
138
139 /* channel_send_members()
140 *
141 * inputs -
142 * output - NONE
143 * side effects -
144 */
145 static void
146 channel_send_members(struct Client *client_p, const struct Channel *channel,
147 const char *modebuf, const char *parabuf)
148 {
149 dlink_node *node;
150 char buf[IRCD_BUFSIZE];
151 int tlen; /* length of text to append */
152 char *t, *start; /* temp char pointer */
153
154 start = t = buf + snprintf(buf, sizeof(buf), ":%s SJOIN %ju %s %s %s:",
155 me.id, channel->creation_time,
156 channel->name, modebuf, parabuf);
157
158 DLINK_FOREACH(node, channel->members.head)
159 {
160 const struct ChannelMember *member = node->data;
161
162 tlen = strlen(member->client->id) + 1; /* +1 for space */
163
164 if (member->flags & CHFL_CHANOP)
165 ++tlen;
166 if (member->flags & CHFL_HALFOP)
167 ++tlen;
168 if (member->flags & CHFL_VOICE)
169 ++tlen;
170
171 /*
172 * Space will be converted into CR, but we also need space for LF..
173 * That's why we use '- 1' here -adx
174 */
175 if (t + tlen - buf > IRCD_BUFSIZE - 1)
176 {
177 *(t - 1) = '\0'; /* Kill the space and terminate the string */
178 sendto_one(client_p, "%s", buf);
179 t = start;
180 }
181
182 if (member->flags & CHFL_CHANOP)
183 *t++ = '@';
184 if (member->flags & CHFL_HALFOP)
185 *t++ = '%';
186 if (member->flags & CHFL_VOICE)
187 *t++ = '+';
188
189 strcpy(t, member->client->id);
190
191 t += strlen(t);
192 *t++ = ' ';
193 }
194
195 /* Should always be non-NULL unless we have a kind of persistent channels */
196 if (channel->members.head)
197 --t; /* Take the space out */
198 *t = '\0';
199 sendto_one(client_p, "%s", buf);
200 }
201
202 /*! \brief Sends +b/+e/+I
203 * \param client_p Client pointer to server
204 * \param channel Pointer to channel
205 * \param list Pointer to list of modes to send
206 * \param flag Char flag flagging type of mode. Currently this can be 'b', e' or 'I'
207 */
208 static void
209 channel_send_mask_list(struct Client *client_p, const struct Channel *channel,
210 const dlink_list *list, const char flag)
211 {
212 dlink_node *node;
213 char mbuf[IRCD_BUFSIZE];
214 char pbuf[IRCD_BUFSIZE];
215 int tlen, mlen, cur_len;
216 char *pp = pbuf;
217
218 if (dlink_list_length(list) == 0)
219 return;
220
221 mlen = snprintf(mbuf, sizeof(mbuf), ":%s BMASK %ju %s %c :", me.id,
222 channel->creation_time, channel->name, flag);
223 cur_len = mlen;
224
225 DLINK_FOREACH(node, list->head)
226 {
227 const struct Ban *ban = node->data;
228
229 tlen = ban->len + 3; /* +3 for ! + @ + space */
230
231 /*
232 * Send buffer and start over if we cannot fit another ban
233 */
234 if (cur_len + (tlen - 1) > IRCD_BUFSIZE - 2)
235 {
236 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
237 sendto_one(client_p, "%s%s", mbuf, pbuf);
238
239 cur_len = mlen;
240 pp = pbuf;
241 }
242
243 pp += sprintf(pp, "%s!%s@%s ", ban->name, ban->user, ban->host);
244 cur_len += tlen;
245 }
246
247 *(pp - 1) = '\0'; /* Get rid of trailing space on buffer */
248 sendto_one(client_p, "%s%s", mbuf, pbuf);
249 }
250
251 /*! \brief Send "client_p" a full list of the modes for channel channel
252 * \param client_p Pointer to client client_p
253 * \param channel Pointer to channel pointer
254 */
255 void
256 channel_send_modes(struct Client *client_p, const struct Channel *channel)
257 {
258 char modebuf[MODEBUFLEN] = "";
259 char parabuf[MODEBUFLEN] = "";
260
261 channel_modes(channel, client_p, modebuf, parabuf);
262 channel_send_members(client_p, channel, modebuf, parabuf);
263
264 channel_send_mask_list(client_p, channel, &channel->banlist, 'b');
265 channel_send_mask_list(client_p, channel, &channel->exceptlist, 'e');
266 channel_send_mask_list(client_p, channel, &channel->invexlist, 'I');
267 }
268
269 /*! \brief Check channel name for invalid characters
270 * \param name Pointer to channel name string
271 * \param local Indicates whether it's a local or remote creation
272 * \return 0 if invalid, 1 otherwise
273 */
274 bool
275 channel_check_name(const char *name, bool local)
276 {
277 const char *p = name;
278
279 assert(!EmptyString(p));
280
281 if (!IsChanPrefix(*p))
282 return false;
283
284 if (local == false || ConfigChannel.disable_fake_channels == 0)
285 {
286 while (*++p)
287 if (!IsChanChar(*p))
288 return false;
289 }
290 else
291 {
292 while (*++p)
293 if (!IsVisibleChanChar(*p))
294 return false;
295 }
296
297 return p - name <= CHANNELLEN;
298 }
299
300 void
301 remove_ban(struct Ban *ban, dlink_list *list)
302 {
303 dlinkDelete(&ban->node, list);
304 xfree(ban);
305 }
306
307 /* channel_free_mask_list()
308 *
309 * inputs - pointer to dlink_list
310 * output - NONE
311 * side effects -
312 */
313 static void
314 channel_free_mask_list(dlink_list *list)
315 {
316 while (list->head)
317 {
318 struct Ban *ban = list->head->data;
319 remove_ban(ban, list);
320 }
321 }
322
323 /*! \brief Get Channel block for name (and allocate a new channel
324 * block, if it didn't exist before)
325 * \param name Channel name
326 * \return Channel block
327 */
328 struct Channel *
329 channel_make(const char *name)
330 {
331 assert(!EmptyString(name));
332
333 struct Channel *channel = xcalloc(sizeof(*channel));
334 channel->hnextch = channel;
335 /* Doesn't hurt to set it here */
336 channel->creation_time = event_base->time.sec_real;
337 channel->last_join_time = event_base->time.sec_monotonic;
338
339 /* Cache channel name length to avoid repetitive strlen() calls. */
340 channel->name_len = strlcpy(channel->name, name, sizeof(channel->name));
341 if (channel->name_len >= sizeof(channel->name))
342 channel->name_len = sizeof(channel->name) - 1;
343
344 dlinkAdd(channel, &channel->node, &channel_list);
345 hash_add_channel(channel);
346
347 return channel;
348 }
349
350 /*! \brief Walk through this channel, and destroy it.
351 * \param channel Channel pointer
352 */
353 void
354 channel_free(struct Channel *channel)
355 {
356 clear_invite_list(&channel->invites);
357
358 /* Free ban/exception/invex lists */
359 channel_free_mask_list(&channel->banlist);
360 channel_free_mask_list(&channel->exceptlist);
361 channel_free_mask_list(&channel->invexlist);
362
363 dlinkDelete(&channel->node, &channel_list);
364 hash_del_channel(channel);
365
366 assert(channel->hnextch == channel);
367
368 assert(channel->node.prev == NULL);
369 assert(channel->node.next == NULL);
370
371 assert(dlink_list_length(&channel->members_local) == 0);
372 assert(channel->members_local.head == NULL);
373 assert(channel->members_local.tail == NULL);
374
375 assert(dlink_list_length(&channel->members) == 0);
376 assert(channel->members.head == NULL);
377 assert(channel->members.tail == NULL);
378
379 assert(dlink_list_length(&channel->invites) == 0);
380 assert(channel->invites.head == NULL);
381 assert(channel->invites.tail == NULL);
382
383 assert(dlink_list_length(&channel->banlist) == 0);
384 assert(channel->banlist.head == NULL);
385 assert(channel->banlist.tail == NULL);
386
387 assert(dlink_list_length(&channel->exceptlist) == 0);
388 assert(channel->exceptlist.head == NULL);
389 assert(channel->exceptlist.tail == NULL);
390
391 assert(dlink_list_length(&channel->invexlist) == 0);
392 assert(channel->invexlist.head == NULL);
393 assert(channel->invexlist.tail == NULL);
394
395 xfree(channel);
396 }
397
398 /*!
399 * \param channel Pointer to channel
400 * \return String pointer "=" if public, "@" if secret else "*"
401 */
402 static const char *
403 channel_pub_or_secret(const struct Channel *channel)
404 {
405 if (SecretChannel(channel))
406 return "@";
407 if (PrivateChannel(channel))
408 return "*";
409 return "=";
410 }
411
412 /*! \brief lists all names on given channel
413 * \param client_p Pointer to client struct requesting names
414 * \param channel Pointer to channel block
415 * \param show_eon Show RPL_ENDOFNAMES numeric or not
416 * (don't want it with /names with no params)
417 */
418 void
419 channel_member_names(struct Client *client_p, struct Channel *channel, bool show_eon)
420 {
421 dlink_node *node;
422 char buf[IRCD_BUFSIZE + 1];
423 int tlen = 0;
424 bool is_member = IsMember(client_p, channel);
425 bool multi_prefix = HasCap(client_p, CAP_MULTI_PREFIX) != 0;
426 bool uhnames = HasCap(client_p, CAP_UHNAMES) != 0;
427
428 assert(IsClient(client_p));
429
430 if (PubChannel(channel) || is_member == true)
431 {
432 char *t = buf + snprintf(buf, sizeof(buf), numeric_form(RPL_NAMREPLY), me.name, client_p->name,
433 channel_pub_or_secret(channel), channel->name);
434 char *start = t;
435
436 DLINK_FOREACH(node, channel->members.head)
437 {
438 const struct ChannelMember *member = node->data;
439
440 if (HasUMode(member->client, UMODE_INVISIBLE) && is_member == false)
441 continue;
442
443 if (uhnames == true)
444 tlen = strlen(member->client->name) + strlen(member->client->username) +
445 strlen(member->client->host) + 3; /* +3 for ! + @ + space */
446 else
447 tlen = strlen(member->client->name) + 1; /* +1 for space */
448
449 if (multi_prefix == true)
450 {
451 if (member->flags & CHFL_CHANOP)
452 ++tlen;
453 if (member->flags & CHFL_HALFOP)
454 ++tlen;
455 if (member->flags & CHFL_VOICE)
456 ++tlen;
457 }
458 else
459 {
460 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
461 ++tlen;
462 }
463
464 if (t + tlen - buf > IRCD_BUFSIZE - 2)
465 {
466 *(t - 1) = '\0';
467 sendto_one(client_p, "%s", buf);
468 t = start;
469 }
470
471 if (uhnames == true)
472 t += sprintf(t, "%s%s!%s@%s ", get_member_status(member, multi_prefix),
473 member->client->name, member->client->username,
474 member->client->host);
475 else
476 t += sprintf(t, "%s%s ", get_member_status(member, multi_prefix),
477 member->client->name);
478 }
479
480 if (tlen)
481 {
482 *(t - 1) = '\0';
483 sendto_one(client_p, "%s", buf);
484 }
485 }
486
487 if (show_eon == true)
488 sendto_one_numeric(client_p, &me, RPL_ENDOFNAMES, channel->name);
489 }
490
491 static struct Invite *
492 find_invite(struct Channel *channel, struct Client *client_p)
493 {
494 dlink_node *node, *node_next;
495 dlink_list *list;
496
497 /* Take the shortest of the two lists */
498 if (dlink_list_length(&client_p->connection->invited) < dlink_list_length(&channel->invites))
499 list = &client_p->connection->invited;
500 else
501 list = &channel->invites;
502
503 DLINK_FOREACH_SAFE(node, node_next, list->head)
504 {
505 struct Invite *invite = node->data;
506
507 if (ConfigChannel.invite_expire_time &&
508 ConfigChannel.invite_expire_time + invite->when < event_base->time.sec_monotonic)
509 del_invite(invite);
510 else if (invite->channel == channel && invite->client == client_p)
511 return invite;
512 }
513
514 return NULL;
515 }
516
517 /*! \brief Adds client to invite list
518 * \param channel Pointer to channel block
519 * \param client_p Pointer to client to add invite to
520 */
521 void
522 add_invite(struct Channel *channel, struct Client *client_p)
523 {
524 struct Invite *invite = find_invite(channel, client_p);
525 if (invite)
526 del_invite(invite);
527
528 invite = xcalloc(sizeof(*invite));
529 invite->client = client_p;
530 invite->channel = channel;
531 invite->when = event_base->time.sec_monotonic;
532
533 /* Delete last link in chain if the list is max length */
534 while (dlink_list_length(&client_p->connection->invited) &&
535 dlink_list_length(&client_p->connection->invited) >= ConfigChannel.max_invites)
536 del_invite(client_p->connection->invited.tail->data);
537
538 /* Add client to channel invite list */
539 dlinkAdd(invite, &invite->chan_node, &channel->invites);
540
541 /* Add channel to the end of the client invite list */
542 dlinkAdd(invite, &invite->user_node, &client_p->connection->invited);
543 }
544
545 /*! \brief Delete Invite block from channel invite list
546 * and client invite list
547 * \param invite Pointer to Invite struct
548 */
549 void
550 del_invite(struct Invite *invite)
551 {
552 dlinkDelete(&invite->user_node, &invite->client->connection->invited);
553 dlinkDelete(&invite->chan_node, &invite->channel->invites);
554
555 /* Release memory pointed to by 'invite' */
556 xfree(invite);
557 }
558
559 /*! \brief Removes and frees all Invite blocks from a list
560 * \param list Pointer to a dlink_list
561 */
562 void
563 clear_invite_list(dlink_list *list)
564 {
565 while (list->head)
566 del_invite(list->head->data);
567 }
568
569 /* get_member_status()
570 *
571 * inputs - pointer to struct ChannelMember
572 * - YES if we can combine different flags
573 * output - string either @, +, % or "" depending on whether
574 * chanop, voiced or user
575 * side effects -
576 *
577 * NOTE: Returned string is usually a static buffer
578 * (like in client_get_name)
579 */
580 const char *
581 get_member_status(const struct ChannelMember *member, bool combine)
582 {
583 static char buffer[CMEMBER_STATUS_FLAGS_LEN + 1]; /* +1 for \0 */
584 char *p = buffer;
585
586 if (member->flags & CHFL_CHANOP)
587 {
588 if (combine == false)
589 return "@";
590 *p++ = '@';
591 }
592
593 if (member->flags & CHFL_HALFOP)
594 {
595 if (combine == false)
596 return "%";
597 *p++ = '%';
598 }
599
600 if (member->flags & CHFL_VOICE)
601 *p++ = '+';
602 *p = '\0';
603
604 return buffer;
605 }
606
607 /*!
608 * \param client_p Pointer to Client to check
609 * \param list Pointer to ban list to search
610 * \return 1 if ban found for given n!u\@h mask, 0 otherwise
611 */
612 static bool
613 find_bmask(const struct Client *client_p, const dlink_list *list)
614 {
615 dlink_node *node;
616
617 DLINK_FOREACH(node, list->head)
618 {
619 const struct Ban *ban = node->data;
620
621 if (match(ban->name, client_p->name) == 0 && match(ban->user, client_p->username) == 0)
622 {
623 switch (ban->type)
624 {
625 case HM_HOST:
626 if (match(ban->host, client_p->realhost) == 0 ||
627 match(ban->host, client_p->sockhost) == 0 || match(ban->host, client_p->host) == 0)
628 return true;
629 break;
630 case HM_IPV4:
631 if (client_p->ip.ss.ss_family == AF_INET)
632 if (match_ipv4(&client_p->ip, &ban->addr, ban->bits))
633 return true;
634 break;
635 case HM_IPV6:
636 if (client_p->ip.ss.ss_family == AF_INET6)
637 if (match_ipv6(&client_p->ip, &ban->addr, ban->bits))
638 return true;
639 break;
640 default:
641 assert(0);
642 }
643 }
644 }
645
646 return false;
647 }
648
649 /*!
650 * \param channel Pointer to channel block
651 * \param client_p Pointer to client to check access fo
652 * \return 0 if not banned, 1 otherwise
653 */
654 bool
655 is_banned(const struct Channel *channel, const struct Client *client_p)
656 {
657 if (find_bmask(client_p, &channel->banlist) == true)
658 return find_bmask(client_p, &channel->exceptlist) == false;
659 return false;
660 }
661
662 /*! Tests if a client can join a certain channel
663 * \param client_p Pointer to client attempting to join
664 * \param channel Pointer to channel
665 * \param key Key sent by client attempting to join if present
666 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
667 * or 0 if allowed to join.
668 */
669 static int
670 can_join(struct Client *client_p, struct Channel *channel, const char *key)
671 {
672 if (HasCMode(channel, MODE_SECUREONLY) && !HasUMode(client_p, UMODE_SECURE))
673 return ERR_SECUREONLYCHAN;
674
675 if (HasCMode(channel, MODE_REGONLY) && !HasUMode(client_p, UMODE_REGISTERED))
676 return ERR_NEEDREGGEDNICK;
677
678 if (HasCMode(channel, MODE_OPERONLY) && !HasUMode(client_p, UMODE_OPER))
679 return ERR_OPERONLYCHAN;
680
681 if (HasCMode(channel, MODE_INVITEONLY))
682 if (find_invite(channel, client_p) == NULL)
683 if (find_bmask(client_p, &channel->invexlist) == false)
684 return ERR_INVITEONLYCHAN;
685
686 if (channel->mode.key[0] && (key == NULL || strcmp(channel->mode.key, key)))
687 return ERR_BADCHANNELKEY;
688
689 if (channel->mode.limit && dlink_list_length(&channel->members) >=
690 channel->mode.limit)
691 return ERR_CHANNELISFULL;
692
693 if (is_banned(channel, client_p) == true)
694 return ERR_BANNEDFROMCHAN;
695
696 return 0;
697 }
698
699 int
700 has_member_flags(const struct ChannelMember *member, const unsigned int flags)
701 {
702 return member && (member->flags & flags);
703 }
704
705 struct ChannelMember *
706 find_channel_link(const struct Client *client_p, const struct Channel *channel)
707 {
708 dlink_node *node;
709
710 if (!IsClient(client_p))
711 return NULL;
712
713 /* Take the shortest of the two lists */
714 if (dlink_list_length(&channel->members) < dlink_list_length(&client_p->channel))
715 {
716 DLINK_FOREACH(node, channel->members.head)
717 if (((struct ChannelMember *)node->data)->client == client_p)
718 return node->data;
719 }
720 else
721 {
722 DLINK_FOREACH(node, client_p->channel.head)
723 if (((struct ChannelMember *)node->data)->channel == channel)
724 return node->data;
725 }
726
727 return NULL;
728 }
729
730 /*! Checks if a message contains control codes
731 * \param message The actual message string the client wants to send
732 * \return 1 if the message does contain any control codes, 0 otherwise
733 */
734 static bool
735 msg_has_ctrls(const char *message)
736 {
737 for (const char *p = message; *p; ++p)
738 {
739 if (*p > 31 || *p == 1)
740 continue; /* No control code or CTCP */
741
742 if (*p == 27) /* Escape */
743 {
744 /* ISO 2022 charset shift sequence */
745 if (*(p + 1) == '$' ||
746 *(p + 1) == '(')
747 {
748 ++p;
749 continue;
750 }
751 }
752
753 return true; /* Control code */
754 }
755
756 return false; /* No control code found */
757 }
758
759 /*! Tests if a client can send to a channel
760 * \param channel Pointer to Channel struct
761 * \param client_p Pointer to Client struct
762 * \param member Pointer to Membership struct (can be NULL)
763 * \param message The actual message string the client wants to send
764 * \return CAN_SEND_OPV if op or voiced on channel\n
765 * CAN_SEND_NONOP if can send to channel but is not an op\n
766 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
767 */
768 int
769 can_send(struct Channel *channel, struct Client *client_p,
770 struct ChannelMember *member, const char *message, bool notice)
771 {
772 const struct ResvItem *resv;
773
774 if (IsServer(client_p) || HasFlag(client_p, FLAGS_SERVICE))
775 return CAN_SEND_OPV;
776
777 if (MyConnect(client_p) && !HasFlag(client_p, FLAGS_EXEMPTRESV))
778 if (!(HasUMode(client_p, UMODE_OPER) && HasOFlag(client_p, OPER_FLAG_JOIN_RESV)))
779 if ((resv = resv_find(channel->name, match)) && resv_exempt_find(client_p, resv) == false)
780 return ERR_CANNOTSENDTOCHAN;
781
782 if (HasCMode(channel, MODE_NOCTRL) && msg_has_ctrls(message) == true)
783 return ERR_NOCTRLSONCHAN;
784
785 if (HasCMode(channel, MODE_NOCTCP))
786 if (*message == '\001' && strncmp(message + 1, "ACTION ", 7))
787 return ERR_NOCTCP;
788
789 if (member || (member = find_channel_link(client_p, channel)))
790 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
791 return CAN_SEND_OPV;
792
793 if (member == NULL && HasCMode(channel, MODE_NOPRIVMSGS))
794 return ERR_CANNOTSENDTOCHAN;
795
796 if (HasCMode(channel, MODE_MODERATED))
797 return ERR_CANNOTSENDTOCHAN;
798
799 if (HasCMode(channel, MODE_MODREG) && !HasUMode(client_p, UMODE_REGISTERED))
800 return ERR_NEEDREGGEDNICK;
801
802 if (HasCMode(channel, MODE_NONOTICE) && notice == true)
803 return ERR_CANNOTSENDTOCHAN;
804
805 /* Cache can send if banned */
806 if (MyConnect(client_p))
807 {
808 if (member)
809 {
810 if (member->flags & CHFL_BAN_SILENCED)
811 return ERR_CANNOTSENDTOCHAN;
812
813 if (!(member->flags & CHFL_BAN_CHECKED))
814 {
815 if (is_banned(channel, client_p) == true)
816 {
817 member->flags |= (CHFL_BAN_CHECKED | CHFL_BAN_SILENCED);
818 return ERR_CANNOTSENDTOCHAN;
819 }
820
821 member->flags |= CHFL_BAN_CHECKED;
822 }
823 }
824 else if (is_banned(channel, client_p) == true)
825 return ERR_CANNOTSENDTOCHAN;
826 }
827
828 return CAN_SEND_NONOP;
829 }
830
831 /*! \brief Updates the client's oper_warn_count_down, warns the
832 * IRC operators if necessary, and updates
833 * join_leave_countdown as needed.
834 * \param client_p Pointer to struct Client to check
835 * \param name Channel name or NULL if this is a part.
836 */
837 void
838 check_spambot_warning(struct Client *client_p, const char *name)
839 {
840 if (GlobalSetOptions.spam_num &&
841 (client_p->connection->join_leave_count >= GlobalSetOptions.spam_num))
842 {
843 if (client_p->connection->oper_warn_count_down)
844 --client_p->connection->oper_warn_count_down;
845
846 if (client_p->connection->oper_warn_count_down == 0)
847 {
848 /* It's already known as a possible spambot */
849 if (name)
850 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
851 "User %s (%s@%s) trying to join %s is a possible spambot",
852 client_p->name, client_p->username,
853 client_p->host, name);
854 else
855 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
856 "User %s (%s@%s) is a possible spambot",
857 client_p->name, client_p->username,
858 client_p->host);
859 client_p->connection->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
860 }
861 }
862 else
863 {
864 unsigned int t_delta = event_base->time.sec_monotonic - client_p->connection->last_leave_time;
865 if (t_delta > JOIN_LEAVE_COUNT_EXPIRE_TIME)
866 {
867 unsigned int decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
868 if (decrement_count > client_p->connection->join_leave_count)
869 client_p->connection->join_leave_count = 0;
870 else
871 client_p->connection->join_leave_count -= decrement_count;
872 }
873 else
874 {
875 if ((event_base->time.sec_monotonic - client_p->connection->last_join_time) < GlobalSetOptions.spam_time)
876 ++client_p->connection->join_leave_count; /* It's a possible spambot */
877 }
878
879 if (name)
880 client_p->connection->last_join_time = event_base->time.sec_monotonic;
881 else
882 client_p->connection->last_leave_time = event_base->time.sec_monotonic;
883 }
884 }
885
886 /*! \brief Sets the channel topic for a certain channel
887 * \param channel Pointer to struct Channel
888 * \param topic The topic string
889 * \param topic_info n!u\@h formatted string of the topic setter
890 * \param topicts Timestamp on the topic
891 * \param local Whether the topic is set by a local client
892 */
893 void
894 channel_set_topic(struct Channel *channel, const char *topic,
895 const char *topic_info, uintmax_t topicts, bool local)
896 {
897 if (local == true)
898 strlcpy(channel->topic, topic, IRCD_MIN(sizeof(channel->topic), ConfigServerInfo.max_topic_length + 1));
899 else
900 strlcpy(channel->topic, topic, sizeof(channel->topic));
901
902 strlcpy(channel->topic_info, topic_info, sizeof(channel->topic_info));
903 channel->topic_time = topicts;
904 }
905
906 void
907 channel_do_join(struct Client *client_p, char *chan_list, char *key_list)
908 {
909 char *p = NULL;
910 const struct ResvItem *resv = NULL;
911 const struct ClassItem *const class = class_get_ptr(&client_p->connection->confs);
912 unsigned int flags = 0;
913
914 assert(MyClient(client_p));
915
916 for (const char *name = strtok_r(chan_list, ",", &p); name;
917 name = strtok_r(NULL, ",", &p))
918 {
919 const char *key = NULL;
920
921 /* If we have any more keys, take the first for this channel. */
922 if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
923 *key_list++ = '\0';
924
925 /* Empty keys are the same as no keys. */
926 if (key && *key == '\0')
927 key = NULL;
928
929 if (channel_check_name(name, true) == false)
930 {
931 sendto_one_numeric(client_p, &me, ERR_BADCHANNAME, name);
932 continue;
933 }
934
935 if (!HasFlag(client_p, FLAGS_EXEMPTRESV) &&
936 !(HasUMode(client_p, UMODE_OPER) && HasOFlag(client_p, OPER_FLAG_JOIN_RESV)) &&
937 ((resv = resv_find(name, match)) && resv_exempt_find(client_p, resv) == false))
938 {
939 sendto_one_numeric(client_p, &me, ERR_CHANBANREASON, name, resv->reason);
940 sendto_realops_flags(UMODE_REJ, L_ALL, SEND_NOTICE,
941 "Forbidding reserved channel %s from user %s",
942 name, client_get_name(client_p, HIDE_IP));
943 continue;
944 }
945
946 if (dlink_list_length(&client_p->channel) >=
947 ((class->max_channels) ? class->max_channels : ConfigChannel.max_channels))
948 {
949 sendto_one_numeric(client_p, &me, ERR_TOOMANYCHANNELS, name);
950 break;
951 }
952
953 struct Channel *channel = hash_find_channel(name);
954 if (channel)
955 {
956 if (IsMember(client_p, channel))
957 continue;
958
959 /* can_join() checks for +i, +l, key, bans, etc. */
960 int ret = can_join(client_p, channel, key);
961 if (ret)
962 {
963 sendto_one_numeric(client_p, &me, ret, channel->name);
964 continue;
965 }
966
967 /*
968 * This should never be the case unless there is some sort of
969 * persistant channels.
970 */
971 if (dlink_list_length(&channel->members) == 0)
972 flags = CHFL_CHANOP;
973 else
974 flags = 0;
975 }
976 else
977 {
978 flags = CHFL_CHANOP;
979 channel = channel_make(name);
980 }
981
982 if (!HasUMode(client_p, UMODE_OPER))
983 check_spambot_warning(client_p, channel->name);
984
985 add_user_to_channel(channel, client_p, flags, true);
986
987 /*
988 * Set timestamp if appropriate, and propagate
989 */
990 if (flags == CHFL_CHANOP)
991 {
992 channel->creation_time = event_base->time.sec_real;
993 AddCMode(channel, MODE_TOPICLIMIT);
994 AddCMode(channel, MODE_NOPRIVMSGS);
995
996 sendto_server(NULL, 0, 0, ":%s SJOIN %ju %s +nt :@%s",
997 me.id, channel->creation_time,
998 channel->name, client_p->id);
999
1000 /*
1001 * Notify all other users on the new channel
1002 */
1003 sendto_channel_local(NULL, channel, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1004 client_p->name, client_p->username,
1005 client_p->host, channel->name, client_p->account, client_p->info);
1006 sendto_channel_local(NULL, channel, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1007 client_p->name, client_p->username,
1008 client_p->host, channel->name);
1009 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s MODE %s +nt",
1010 me.name, channel->name);
1011 }
1012 else
1013 {
1014 sendto_server(NULL, 0, 0, ":%s JOIN %ju %s +",
1015 client_p->id, channel->creation_time,
1016 channel->name);
1017
1018 sendto_channel_local(NULL, channel, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1019 client_p->name, client_p->username,
1020 client_p->host, channel->name, client_p->account, client_p->info);
1021 sendto_channel_local(NULL, channel, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1022 client_p->name, client_p->username,
1023 client_p->host, channel->name);
1024 }
1025
1026 if (client_p->away[0])
1027 sendto_channel_local(client_p, channel, 0, CAP_AWAY_NOTIFY, 0,
1028 ":%s!%s@%s AWAY :%s",
1029 client_p->name, client_p->username,
1030 client_p->host, client_p->away);
1031
1032 struct Invite *invite = find_invite(channel, client_p);
1033 if (invite)
1034 del_invite(invite);
1035
1036 if (channel->topic[0])
1037 {
1038 sendto_one_numeric(client_p, &me, RPL_TOPIC, channel->name, channel->topic);
1039 sendto_one_numeric(client_p, &me, RPL_TOPICWHOTIME, channel->name,
1040 channel->topic_info, channel->topic_time);
1041 }
1042
1043 channel_member_names(client_p, channel, true);
1044
1045 client_p->connection->last_join_time = event_base->time.sec_monotonic;
1046 }
1047 }
1048
1049 /*! \brief Removes a client from a specific channel
1050 * \param client_p Pointer to client to remove
1051 * \param name Name of channel to remove from
1052 * \param reason Part reason to show
1053 */
1054 static void
1055 channel_part_one_client(struct Client *client_p, const char *name, const char *reason)
1056 {
1057 struct Channel *channel = NULL;
1058 struct ChannelMember *member = NULL;
1059
1060 if ((channel = hash_find_channel(name)) == NULL)
1061 {
1062 sendto_one_numeric(client_p, &me, ERR_NOSUCHCHANNEL, name);
1063 return;
1064 }
1065
1066 if ((member = find_channel_link(client_p, channel)) == NULL)
1067 {
1068 sendto_one_numeric(client_p, &me, ERR_NOTONCHANNEL, channel->name);
1069 return;
1070 }
1071
1072 if (MyConnect(client_p) && !HasUMode(client_p, UMODE_OPER))
1073 check_spambot_warning(client_p, NULL);
1074
1075 /*
1076 * Remove user from the old channel (if any)
1077 * only allow /part reasons in -m chans
1078 */
1079 if (*reason && (!MyConnect(client_p) ||
1080 ((client_p->connection->created_monotonic +
1081 ConfigGeneral.anti_spam_exit_message_time) < event_base->time.sec_monotonic &&
1082 can_send(channel, client_p, member, reason, false) < 0)))
1083 {
1084 sendto_server(client_p, 0, 0, ":%s PART %s :%s",
1085 client_p->id, channel->name, reason);
1086 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s PART %s :%s",
1087 client_p->name, client_p->username,
1088 client_p->host, channel->name, reason);
1089 }
1090 else
1091 {
1092 sendto_server(client_p, 0, 0, ":%s PART %s",
1093 client_p->id, channel->name);
1094 sendto_channel_local(NULL, channel, 0, 0, 0, ":%s!%s@%s PART %s",
1095 client_p->name, client_p->username,
1096 client_p->host, channel->name);
1097 }
1098
1099 remove_user_from_channel(member);
1100 }
1101
1102 void
1103 channel_do_part(struct Client *client_p, char *channel, const char *reason)
1104 {
1105 char *p = NULL;
1106 char buf[KICKLEN + 1] = "";
1107
1108 assert(IsClient(client_p));
1109
1110 if (!EmptyString(reason))
1111 strlcpy(buf, reason, sizeof(buf));
1112
1113 for (const char *name = strtok_r(channel, ",", &p); name;
1114 name = strtok_r(NULL, ",", &p))
1115 channel_part_one_client(client_p, name, buf);
1116 }

Properties

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