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Revision 8600 - (show annotations)
Sun Oct 28 18:12:12 2018 UTC (4 years, 3 months ago) by michael
File MIME type: text/x-chdr
File size: 32442 byte(s)
- Rename Channel:locmembers to Channel::members_local

1 /*
2 * ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3 *
4 * Copyright (c) 1997-2018 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 chptr 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 *chptr, struct Client *client_p,
68 unsigned int flags, int flood_ctrl)
69 {
70 assert(IsClient(client_p));
71
72 if (GlobalSetOptions.joinfloodtime)
73 {
74 if (flood_ctrl)
75 ++chptr->number_joined;
76
77 chptr->number_joined -= (CurrentTime - chptr->last_join_time) *
78 (((float)GlobalSetOptions.joinfloodcount) /
79 (float)GlobalSetOptions.joinfloodtime);
80
81 if (chptr->number_joined <= 0)
82 {
83 chptr->number_joined = 0;
84 ClearJoinFloodNoticed(chptr);
85 }
86 else if (chptr->number_joined >= GlobalSetOptions.joinfloodcount)
87 {
88 chptr->number_joined = GlobalSetOptions.joinfloodcount;
89
90 if (!IsSetJoinFloodNoticed(chptr))
91 {
92 SetJoinFloodNoticed(chptr);
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, chptr->name);
97 }
98 }
99
100 chptr->last_join_time = CurrentTime;
101 }
102
103 struct Membership *member = xcalloc(sizeof(*member));
104 member->client_p = client_p;
105 member->chptr = chptr;
106 member->flags = flags;
107
108 dlinkAdd(member, &member->channode, &chptr->members);
109
110 if (MyConnect(client_p))
111 dlinkAdd(member, &member->locchannode, &chptr->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 Membership *member)
122 {
123 struct Client *const client_p = member->client_p;
124 struct Channel *const chptr = member->chptr;
125
126 dlinkDelete(&member->channode, &chptr->members);
127
128 if (MyConnect(client_p))
129 dlinkDelete(&member->locchannode, &chptr->members_local);
130
131 dlinkDelete(&member->usernode, &client_p->channel);
132
133 xfree(member);
134
135 if (chptr->members.head == NULL)
136 channel_free(chptr);
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 *chptr,
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, chptr->creationtime,
156 chptr->name, modebuf, parabuf);
157
158 DLINK_FOREACH(node, chptr->members.head)
159 {
160 const struct Membership *member = node->data;
161
162 tlen = strlen(member->client_p->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_p->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 (chptr->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 chptr 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 *chptr,
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 chptr->creationtime, chptr->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 chptr
252 * \param client_p Pointer to client client_p
253 * \param chptr Pointer to channel pointer
254 */
255 void
256 channel_send_modes(struct Client *client_p, const struct Channel *chptr)
257 {
258 char modebuf[MODEBUFLEN] = "";
259 char parabuf[MODEBUFLEN] = "";
260
261 channel_modes(chptr, client_p, modebuf, parabuf);
262 channel_send_members(client_p, chptr, modebuf, parabuf);
263
264 channel_send_mask_list(client_p, chptr, &chptr->banlist, 'b');
265 channel_send_mask_list(client_p, chptr, &chptr->exceptlist, 'e');
266 channel_send_mask_list(client_p, chptr, &chptr->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 int
275 channel_check_name(const char *name, const int local)
276 {
277 const char *p = name;
278
279 assert(!EmptyString(p));
280
281 if (!IsChanPrefix(*p))
282 return 0;
283
284 if (!local || !ConfigChannel.disable_fake_channels)
285 {
286 while (*++p)
287 if (!IsChanChar(*p))
288 return 0;
289 }
290 else
291 {
292 while (*++p)
293 if (!IsVisibleChanChar(*p))
294 return 0;
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 *chptr = xcalloc(sizeof(*chptr));
334 chptr->hnextch = chptr;
335 /* Doesn't hurt to set it here */
336 chptr->creationtime = CurrentTime;
337 chptr->last_join_time = CurrentTime;
338
339 /* Cache channel name length to avoid repetitive strlen() calls. */
340 chptr->name_len = strlcpy(chptr->name, name, sizeof(chptr->name));
341 if (chptr->name_len >= sizeof(chptr->name))
342 chptr->name_len = sizeof(chptr->name) - 1;
343
344 dlinkAdd(chptr, &chptr->node, &channel_list);
345 hash_add_channel(chptr);
346
347 return chptr;
348 }
349
350 /*! \brief Walk through this channel, and destroy it.
351 * \param chptr Channel pointer
352 */
353 void
354 channel_free(struct Channel *chptr)
355 {
356 clear_invite_list(&chptr->invites);
357
358 /* Free ban/exception/invex lists */
359 channel_free_mask_list(&chptr->banlist);
360 channel_free_mask_list(&chptr->exceptlist);
361 channel_free_mask_list(&chptr->invexlist);
362
363 dlinkDelete(&chptr->node, &channel_list);
364 hash_del_channel(chptr);
365
366 assert(chptr->hnextch == chptr);
367
368 assert(chptr->node.prev == NULL);
369 assert(chptr->node.next == NULL);
370
371 assert(dlink_list_length(&chptr->members_local) == 0);
372 assert(chptr->members_local.head == NULL);
373 assert(chptr->members_local.tail == NULL);
374
375 assert(dlink_list_length(&chptr->members) == 0);
376 assert(chptr->members.head == NULL);
377 assert(chptr->members.tail == NULL);
378
379 assert(dlink_list_length(&chptr->invites) == 0);
380 assert(chptr->invites.head == NULL);
381 assert(chptr->invites.tail == NULL);
382
383 assert(dlink_list_length(&chptr->banlist) == 0);
384 assert(chptr->banlist.head == NULL);
385 assert(chptr->banlist.tail == NULL);
386
387 assert(dlink_list_length(&chptr->exceptlist) == 0);
388 assert(chptr->exceptlist.head == NULL);
389 assert(chptr->exceptlist.tail == NULL);
390
391 assert(dlink_list_length(&chptr->invexlist) == 0);
392 assert(chptr->invexlist.head == NULL);
393 assert(chptr->invexlist.tail == NULL);
394
395 xfree(chptr);
396 }
397
398 /*!
399 * \param chptr 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 *chptr)
404 {
405 if (SecretChannel(chptr))
406 return "@";
407 if (PrivateChannel(chptr))
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 chptr 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 *chptr, int show_eon)
420 {
421 dlink_node *node;
422 char buf[IRCD_BUFSIZE + 1] = "";
423 char *t = NULL, *start = NULL;
424 int tlen = 0;
425 const int is_member = IsMember(client_p, chptr);
426 const int multi_prefix = HasCap(client_p, CAP_MULTI_PREFIX) != 0;
427 const int uhnames = HasCap(client_p, CAP_UHNAMES) != 0;
428
429 assert(IsClient(client_p));
430
431 if (PubChannel(chptr) || is_member)
432 {
433 t = buf + snprintf(buf, sizeof(buf), numeric_form(RPL_NAMREPLY),
434 me.name, client_p->name,
435 channel_pub_or_secret(chptr), chptr->name);
436 start = t;
437
438 DLINK_FOREACH(node, chptr->members.head)
439 {
440 const struct Membership *member = node->data;
441
442 if (HasUMode(member->client_p, UMODE_INVISIBLE) && !is_member)
443 continue;
444
445 if (uhnames)
446 tlen = strlen(member->client_p->name) + strlen(member->client_p->username) +
447 strlen(member->client_p->host) + 3; /* +3 for ! + @ + space */
448 else
449 tlen = strlen(member->client_p->name) + 1; /* +1 for space */
450
451 if (multi_prefix)
452 {
453 if (member->flags & CHFL_CHANOP)
454 ++tlen;
455 if (member->flags & CHFL_HALFOP)
456 ++tlen;
457 if (member->flags & CHFL_VOICE)
458 ++tlen;
459 }
460 else
461 {
462 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
463 ++tlen;
464 }
465
466 if (t + tlen - buf > IRCD_BUFSIZE - 2)
467 {
468 *(t - 1) = '\0';
469 sendto_one(client_p, "%s", buf);
470 t = start;
471 }
472
473 if (uhnames)
474 t += sprintf(t, "%s%s!%s@%s ", get_member_status(member, multi_prefix),
475 member->client_p->name, member->client_p->username,
476 member->client_p->host);
477 else
478 t += sprintf(t, "%s%s ", get_member_status(member, multi_prefix),
479 member->client_p->name);
480 }
481
482 if (tlen)
483 {
484 *(t - 1) = '\0';
485 sendto_one(client_p, "%s", buf);
486 }
487 }
488
489 if (show_eon)
490 sendto_one_numeric(client_p, &me, RPL_ENDOFNAMES, chptr->name);
491 }
492
493 static struct Invite *
494 find_invite(struct Channel *chptr, struct Client *client_p)
495 {
496 dlink_node *node, *node_next;
497 dlink_list *list;
498
499 /* Take the shortest of the two lists */
500 if (dlink_list_length(&client_p->connection->invited) < dlink_list_length(&chptr->invites))
501 list = &client_p->connection->invited;
502 else
503 list = &chptr->invites;
504
505 DLINK_FOREACH_SAFE(node, node_next, list->head)
506 {
507 struct Invite *invite = node->data;
508
509 if (ConfigChannel.invite_expire_time &&
510 ConfigChannel.invite_expire_time + invite->when < CurrentTime)
511 del_invite(invite);
512 else if (invite->chptr == chptr && invite->client_p == client_p)
513 return invite;
514 }
515
516 return NULL;
517 }
518
519 /*! \brief Adds client to invite list
520 * \param chptr Pointer to channel block
521 * \param client_p Pointer to client to add invite to
522 */
523 void
524 add_invite(struct Channel *chptr, struct Client *client_p)
525 {
526 struct Invite *invite;
527 if ((invite = find_invite(chptr, client_p)))
528 del_invite(invite);
529
530 invite = xcalloc(sizeof(*invite));
531 invite->client_p = client_p;
532 invite->chptr = chptr;
533 invite->when = CurrentTime;
534
535 /* Delete last link in chain if the list is max length */
536 while (dlink_list_length(&client_p->connection->invited) &&
537 dlink_list_length(&client_p->connection->invited) >= ConfigChannel.max_invites)
538 del_invite(client_p->connection->invited.tail->data);
539
540 /* Add client to channel invite list */
541 dlinkAdd(invite, &invite->chan_node, &chptr->invites);
542
543 /* Add channel to the end of the client invite list */
544 dlinkAdd(invite, &invite->user_node, &client_p->connection->invited);
545 }
546
547 /*! \brief Delete Invite block from channel invite list
548 * and client invite list
549 * \param invite Pointer to Invite struct
550 */
551 void
552 del_invite(struct Invite *invite)
553 {
554 dlinkDelete(&invite->user_node, &invite->client_p->connection->invited);
555 dlinkDelete(&invite->chan_node, &invite->chptr->invites);
556
557 /* Release memory pointed to by 'invite' */
558 xfree(invite);
559 }
560
561 /*! \brief Removes and frees all Invite blocks from a list
562 * \param list Pointer to a dlink_list
563 */
564 void
565 clear_invite_list(dlink_list *list)
566 {
567 while (list->head)
568 del_invite(list->head->data);
569 }
570
571 /* get_member_status()
572 *
573 * inputs - pointer to struct Membership
574 * - YES if we can combine different flags
575 * output - string either @, +, % or "" depending on whether
576 * chanop, voiced or user
577 * side effects -
578 *
579 * NOTE: Returned string is usually a static buffer
580 * (like in client_get_name)
581 */
582 const char *
583 get_member_status(const struct Membership *member, const int combine)
584 {
585 static char buffer[CMEMBER_STATUS_FLAGS_LEN + 1]; /* +1 for \0 */
586 char *p = buffer;
587
588 if (member->flags & CHFL_CHANOP)
589 {
590 if (!combine)
591 return "@";
592 *p++ = '@';
593 }
594
595 if (member->flags & CHFL_HALFOP)
596 {
597 if (!combine)
598 return "%";
599 *p++ = '%';
600 }
601
602 if (member->flags & CHFL_VOICE)
603 *p++ = '+';
604 *p = '\0';
605
606 return buffer;
607 }
608
609 /*!
610 * \param client_p Pointer to Client to check
611 * \param list Pointer to ban list to search
612 * \return 1 if ban found for given n!u\@h mask, 0 otherwise
613 */
614 static int
615 find_bmask(const struct Client *client_p, const dlink_list *list)
616 {
617 dlink_node *node;
618
619 DLINK_FOREACH(node, list->head)
620 {
621 const struct Ban *ban = node->data;
622
623 if (!match(ban->name, client_p->name) && !match(ban->user, client_p->username))
624 {
625 switch (ban->type)
626 {
627 case HM_HOST:
628 if (!match(ban->host, client_p->host) || !match(ban->host, client_p->sockhost))
629 return 1;
630 break;
631 case HM_IPV4:
632 if (client_p->ip.ss.ss_family == AF_INET)
633 if (match_ipv4(&client_p->ip, &ban->addr, ban->bits))
634 return 1;
635 break;
636 case HM_IPV6:
637 if (client_p->ip.ss.ss_family == AF_INET6)
638 if (match_ipv6(&client_p->ip, &ban->addr, ban->bits))
639 return 1;
640 break;
641 default:
642 assert(0);
643 }
644 }
645 }
646
647 return 0;
648 }
649
650 /*!
651 * \param chptr Pointer to channel block
652 * \param client_p Pointer to client to check access fo
653 * \return 0 if not banned, 1 otherwise
654 */
655 int
656 is_banned(const struct Channel *chptr, const struct Client *client_p)
657 {
658 if (find_bmask(client_p, &chptr->banlist))
659 if (!find_bmask(client_p, &chptr->exceptlist))
660 return 1;
661
662 return 0;
663 }
664
665 /*! Tests if a client can join a certain channel
666 * \param client_p Pointer to client attempting to join
667 * \param chptr Pointer to channel
668 * \param key Key sent by client attempting to join if present
669 * \return ERR_BANNEDFROMCHAN, ERR_INVITEONLYCHAN, ERR_CHANNELISFULL
670 * or 0 if allowed to join.
671 */
672 static int
673 can_join(struct Client *client_p, struct Channel *chptr, const char *key)
674 {
675 if (HasCMode(chptr, MODE_SSLONLY) && !HasUMode(client_p, UMODE_SSL))
676 return ERR_SSLONLYCHAN;
677
678 if (HasCMode(chptr, MODE_REGONLY) && !HasUMode(client_p, UMODE_REGISTERED))
679 return ERR_NEEDREGGEDNICK;
680
681 if (HasCMode(chptr, MODE_OPERONLY) && !HasUMode(client_p, UMODE_OPER))
682 return ERR_OPERONLYCHAN;
683
684 if (HasCMode(chptr, MODE_INVITEONLY))
685 if (!find_invite(chptr, client_p))
686 if (!find_bmask(client_p, &chptr->invexlist))
687 return ERR_INVITEONLYCHAN;
688
689 if (chptr->mode.key[0] && (!key || strcmp(chptr->mode.key, key)))
690 return ERR_BADCHANNELKEY;
691
692 if (chptr->mode.limit && dlink_list_length(&chptr->members) >=
693 chptr->mode.limit)
694 return ERR_CHANNELISFULL;
695
696 if (is_banned(chptr, client_p))
697 return ERR_BANNEDFROMCHAN;
698
699 return 0;
700 }
701
702 int
703 has_member_flags(const struct Membership *member, const unsigned int flags)
704 {
705 return member && (member->flags & flags);
706 }
707
708 struct Membership *
709 find_channel_link(const struct Client *client_p, const struct Channel *chptr)
710 {
711 dlink_node *node;
712
713 if (!IsClient(client_p))
714 return NULL;
715
716 /* Take the shortest of the two lists */
717 if (dlink_list_length(&chptr->members) < dlink_list_length(&client_p->channel))
718 {
719 DLINK_FOREACH(node, chptr->members.head)
720 if (((struct Membership *)node->data)->client_p == client_p)
721 return node->data;
722 }
723 else
724 {
725 DLINK_FOREACH(node, client_p->channel.head)
726 if (((struct Membership *)node->data)->chptr == chptr)
727 return node->data;
728 }
729
730 return NULL;
731 }
732
733 /*! Checks if a message contains control codes
734 * \param message The actual message string the client wants to send
735 * \return 1 if the message does contain any control codes, 0 otherwise
736 */
737 static int
738 msg_has_ctrls(const char *message)
739 {
740 const unsigned char *p = (const unsigned char *)message;
741
742 for (; *p; ++p)
743 {
744 if (*p > 31 || *p == 1)
745 continue; /* No control code or CTCP */
746
747 if (*p == 27) /* Escape */
748 {
749 /* ISO 2022 charset shift sequence */
750 if (*(p + 1) == '$' ||
751 *(p + 1) == '(')
752 {
753 ++p;
754 continue;
755 }
756 }
757
758 return 1; /* Control code */
759 }
760
761 return 0; /* No control code found */
762 }
763
764 /*! Tests if a client can send to a channel
765 * \param chptr Pointer to Channel struct
766 * \param client_p Pointer to Client struct
767 * \param member Pointer to Membership struct (can be NULL)
768 * \param message The actual message string the client wants to send
769 * \return CAN_SEND_OPV if op or voiced on channel\n
770 * CAN_SEND_NONOP if can send to channel but is not an op\n
771 * ERR_CANNOTSENDTOCHAN or ERR_NEEDREGGEDNICK if they cannot send to channel\n
772 */
773 int
774 can_send(struct Channel *chptr, struct Client *client_p,
775 struct Membership *member, const char *message, int notice)
776 {
777 const struct ResvItem *resv = NULL;
778
779 if (IsServer(client_p) || HasFlag(client_p, FLAGS_SERVICE))
780 return CAN_SEND_OPV;
781
782 if (MyConnect(client_p) && !HasFlag(client_p, FLAGS_EXEMPTRESV))
783 if (!(HasUMode(client_p, UMODE_OPER) && HasOFlag(client_p, OPER_FLAG_JOIN_RESV)))
784 if ((resv = resv_find(chptr->name, match)) && !resv_exempt_find(client_p, resv))
785 return ERR_CANNOTSENDTOCHAN;
786
787 if (HasCMode(chptr, MODE_NOCTRL) && msg_has_ctrls(message))
788 return ERR_NOCTRLSONCHAN;
789
790 if (HasCMode(chptr, MODE_NOCTCP))
791 if (*message == '\001' && strncmp(message + 1, "ACTION ", 7))
792 return ERR_NOCTCP;
793
794 if (member || (member = find_channel_link(client_p, chptr)))
795 if (member->flags & (CHFL_CHANOP | CHFL_HALFOP | CHFL_VOICE))
796 return CAN_SEND_OPV;
797
798 if (member == NULL && HasCMode(chptr, MODE_NOPRIVMSGS))
799 return ERR_CANNOTSENDTOCHAN;
800
801 if (HasCMode(chptr, MODE_MODERATED))
802 return ERR_CANNOTSENDTOCHAN;
803
804 if (HasCMode(chptr, MODE_MODREG) && !HasUMode(client_p, UMODE_REGISTERED))
805 return ERR_NEEDREGGEDNICK;
806
807 if (HasCMode(chptr, MODE_NONOTICE) && notice)
808 return ERR_CANNOTSENDTOCHAN;
809
810 /* Cache can send if banned */
811 if (MyConnect(client_p))
812 {
813 if (member)
814 {
815 if (member->flags & CHFL_BAN_SILENCED)
816 return ERR_CANNOTSENDTOCHAN;
817
818 if (!(member->flags & CHFL_BAN_CHECKED))
819 {
820 if (is_banned(chptr, client_p))
821 {
822 member->flags |= (CHFL_BAN_CHECKED | CHFL_BAN_SILENCED);
823 return ERR_CANNOTSENDTOCHAN;
824 }
825
826 member->flags |= CHFL_BAN_CHECKED;
827 }
828 }
829 else if (is_banned(chptr, client_p))
830 return ERR_CANNOTSENDTOCHAN;
831 }
832
833 return CAN_SEND_NONOP;
834 }
835
836 /*! \brief Updates the client's oper_warn_count_down, warns the
837 * IRC operators if necessary, and updates
838 * join_leave_countdown as needed.
839 * \param client_p Pointer to struct Client to check
840 * \param name Channel name or NULL if this is a part.
841 */
842 void
843 check_spambot_warning(struct Client *client_p, const char *name)
844 {
845 if (GlobalSetOptions.spam_num &&
846 (client_p->connection->join_leave_count >= GlobalSetOptions.spam_num))
847 {
848 if (client_p->connection->oper_warn_count_down > 0)
849 client_p->connection->oper_warn_count_down--;
850 else
851 client_p->connection->oper_warn_count_down = 0;
852
853 if (client_p->connection->oper_warn_count_down == 0)
854 {
855 /* It's already known as a possible spambot */
856 if (name)
857 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
858 "User %s (%s@%s) trying to join %s is a possible spambot",
859 client_p->name, client_p->username,
860 client_p->host, name);
861 else
862 sendto_realops_flags(UMODE_BOTS, L_ALL, SEND_NOTICE,
863 "User %s (%s@%s) is a possible spambot",
864 client_p->name, client_p->username,
865 client_p->host);
866 client_p->connection->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
867 }
868 }
869 else
870 {
871 int t_delta = CurrentTime - client_p->connection->last_leave_time;
872 if (t_delta > JOIN_LEAVE_COUNT_EXPIRE_TIME)
873 {
874 int decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
875 if (decrement_count > client_p->connection->join_leave_count)
876 client_p->connection->join_leave_count = 0;
877 else
878 client_p->connection->join_leave_count -= decrement_count;
879 }
880 else
881 {
882 if ((CurrentTime - (client_p->connection->last_join_time)) <
883 GlobalSetOptions.spam_time)
884 client_p->connection->join_leave_count++; /* It's a possible spambot */
885 }
886
887 if (name)
888 client_p->connection->last_join_time = CurrentTime;
889 else
890 client_p->connection->last_leave_time = CurrentTime;
891 }
892 }
893
894 /*! \brief Sets the channel topic for a certain channel
895 * \param chptr Pointer to struct Channel
896 * \param topic The topic string
897 * \param topic_info n!u\@h formatted string of the topic setter
898 * \param topicts Timestamp on the topic
899 * \param local Whether the topic is set by a local client
900 */
901 void
902 channel_set_topic(struct Channel *chptr, const char *topic,
903 const char *topic_info, uintmax_t topicts, int local)
904 {
905 if (local)
906 strlcpy(chptr->topic, topic, IRCD_MIN(sizeof(chptr->topic), ConfigServerInfo.max_topic_length + 1));
907 else
908 strlcpy(chptr->topic, topic, sizeof(chptr->topic));
909
910 strlcpy(chptr->topic_info, topic_info, sizeof(chptr->topic_info));
911 chptr->topic_time = topicts;
912 }
913
914 void
915 channel_do_join(struct Client *client_p, char *chan_list, char *key_list)
916 {
917 char *p = NULL;
918 const struct ResvItem *resv = NULL;
919 const struct ClassItem *const class = class_get_ptr(&client_p->connection->confs);
920 unsigned int flags = 0;
921
922 assert(MyClient(client_p));
923
924 for (const char *name = strtok_r(chan_list, ",", &p); name;
925 name = strtok_r(NULL, ",", &p))
926 {
927 const char *key = NULL;
928
929 /* If we have any more keys, take the first for this channel. */
930 if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
931 *key_list++ = '\0';
932
933 /* Empty keys are the same as no keys. */
934 if (key && *key == '\0')
935 key = NULL;
936
937 if (channel_check_name(name, 1) == 0)
938 {
939 sendto_one_numeric(client_p, &me, ERR_BADCHANNAME, name);
940 continue;
941 }
942
943 if (!HasFlag(client_p, FLAGS_EXEMPTRESV) &&
944 !(HasUMode(client_p, UMODE_OPER) && HasOFlag(client_p, OPER_FLAG_JOIN_RESV)) &&
945 ((resv = resv_find(name, match)) && !resv_exempt_find(client_p, resv)))
946 {
947 sendto_one_numeric(client_p, &me, ERR_CHANBANREASON, name, resv->reason);
948 sendto_realops_flags(UMODE_REJ, L_ALL, SEND_NOTICE,
949 "Forbidding reserved channel %s from user %s",
950 name, client_get_name(client_p, HIDE_IP));
951 continue;
952 }
953
954 if (dlink_list_length(&client_p->channel) >=
955 ((class->max_channels) ? class->max_channels : ConfigChannel.max_channels))
956 {
957 sendto_one_numeric(client_p, &me, ERR_TOOMANYCHANNELS, name);
958 break;
959 }
960
961 struct Channel *chptr;
962 if ((chptr = hash_find_channel(name)))
963 {
964 if (IsMember(client_p, chptr))
965 continue;
966
967 /* can_join() checks for +i, +l, key, bans, etc. */
968 int ret = can_join(client_p, chptr, key);
969 if (ret)
970 {
971 sendto_one_numeric(client_p, &me, ret, chptr->name);
972 continue;
973 }
974
975 /*
976 * This should never be the case unless there is some sort of
977 * persistant channels.
978 */
979 if (dlink_list_length(&chptr->members) == 0)
980 flags = CHFL_CHANOP;
981 else
982 flags = 0;
983 }
984 else
985 {
986 flags = CHFL_CHANOP;
987 chptr = channel_make(name);
988 }
989
990 if (!HasUMode(client_p, UMODE_OPER))
991 check_spambot_warning(client_p, chptr->name);
992
993 add_user_to_channel(chptr, client_p, flags, 1);
994
995 /*
996 * Set timestamp if appropriate, and propagate
997 */
998 if (flags == CHFL_CHANOP)
999 {
1000 chptr->creationtime = CurrentTime;
1001 AddCMode(chptr, MODE_TOPICLIMIT);
1002 AddCMode(chptr, MODE_NOPRIVMSGS);
1003
1004 sendto_server(NULL, 0, 0, ":%s SJOIN %ju %s +nt :@%s",
1005 me.id, chptr->creationtime,
1006 chptr->name, client_p->id);
1007
1008 /*
1009 * Notify all other users on the new channel
1010 */
1011 sendto_channel_local(NULL, chptr, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1012 client_p->name, client_p->username,
1013 client_p->host, chptr->name, client_p->account, client_p->info);
1014 sendto_channel_local(NULL, chptr, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1015 client_p->name, client_p->username,
1016 client_p->host, chptr->name);
1017 sendto_channel_local(NULL, chptr, 0, 0, 0, ":%s MODE %s +nt",
1018 me.name, chptr->name);
1019 }
1020 else
1021 {
1022 sendto_server(NULL, 0, 0, ":%s JOIN %ju %s +",
1023 client_p->id, chptr->creationtime,
1024 chptr->name);
1025
1026 sendto_channel_local(NULL, chptr, 0, CAP_EXTENDED_JOIN, 0, ":%s!%s@%s JOIN %s %s :%s",
1027 client_p->name, client_p->username,
1028 client_p->host, chptr->name, client_p->account, client_p->info);
1029 sendto_channel_local(NULL, chptr, 0, 0, CAP_EXTENDED_JOIN, ":%s!%s@%s JOIN :%s",
1030 client_p->name, client_p->username,
1031 client_p->host, chptr->name);
1032 }
1033
1034 if (client_p->away[0])
1035 sendto_channel_local(client_p, chptr, 0, CAP_AWAY_NOTIFY, 0,
1036 ":%s!%s@%s AWAY :%s",
1037 client_p->name, client_p->username,
1038 client_p->host, client_p->away);
1039
1040 struct Invite *invite;
1041 if ((invite = find_invite(chptr, client_p)))
1042 del_invite(invite);
1043
1044 if (chptr->topic[0])
1045 {
1046 sendto_one_numeric(client_p, &me, RPL_TOPIC, chptr->name, chptr->topic);
1047 sendto_one_numeric(client_p, &me, RPL_TOPICWHOTIME, chptr->name,
1048 chptr->topic_info, chptr->topic_time);
1049 }
1050
1051 channel_member_names(client_p, chptr, 1);
1052
1053 client_p->connection->last_join_time = CurrentTime;
1054 }
1055 }
1056
1057 /*! \brief Removes a client from a specific channel
1058 * \param client_p Pointer to client to remove
1059 * \param name Name of channel to remove from
1060 * \param reason Part reason to show
1061 */
1062 static void
1063 channel_part_one_client(struct Client *client_p, const char *name, const char *reason)
1064 {
1065 struct Channel *chptr = NULL;
1066 struct Membership *member = NULL;
1067
1068 if ((chptr = hash_find_channel(name)) == NULL)
1069 {
1070 sendto_one_numeric(client_p, &me, ERR_NOSUCHCHANNEL, name);
1071 return;
1072 }
1073
1074 if ((member = find_channel_link(client_p, chptr)) == NULL)
1075 {
1076 sendto_one_numeric(client_p, &me, ERR_NOTONCHANNEL, chptr->name);
1077 return;
1078 }
1079
1080 if (MyConnect(client_p) && !HasUMode(client_p, UMODE_OPER))
1081 check_spambot_warning(client_p, NULL);
1082
1083 /*
1084 * Remove user from the old channel (if any)
1085 * only allow /part reasons in -m chans
1086 */
1087 if (*reason && (!MyConnect(client_p) ||
1088 ((client_p->connection->firsttime +
1089 ConfigGeneral.anti_spam_exit_message_time) < CurrentTime &&
1090 can_send(chptr, client_p, member, reason, 0) < 0)))
1091 {
1092 sendto_server(client_p, 0, 0, ":%s PART %s :%s",
1093 client_p->id, chptr->name, reason);
1094 sendto_channel_local(NULL, chptr, 0, 0, 0, ":%s!%s@%s PART %s :%s",
1095 client_p->name, client_p->username,
1096 client_p->host, chptr->name, reason);
1097 }
1098 else
1099 {
1100 sendto_server(client_p, 0, 0, ":%s PART %s",
1101 client_p->id, chptr->name);
1102 sendto_channel_local(NULL, chptr, 0, 0, 0, ":%s!%s@%s PART %s",
1103 client_p->name, client_p->username,
1104 client_p->host, chptr->name);
1105 }
1106
1107 remove_user_from_channel(member);
1108 }
1109
1110 void
1111 channel_do_part(struct Client *client_p, char *channel, const char *reason)
1112 {
1113 char *p = NULL;
1114 char buf[KICKLEN + 1] = "";
1115
1116 assert(IsClient(client_p));
1117
1118 if (!EmptyString(reason))
1119 strlcpy(buf, reason, sizeof(buf));
1120
1121 for (const char *name = strtok_r(channel, ",", &p); name;
1122 name = strtok_r(NULL, ",", &p))
1123 channel_part_one_client(client_p, name, buf);
1124 }

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