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

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Revision 1785 - (show annotations)
Sat Jan 26 22:40:55 2013 UTC (7 years, 7 months ago) by michael
File MIME type: text/x-chdr
File size: 35878 byte(s)
- Forward-port -r1784 [Fix bug where idle time sometimes is 0 even if the
  client didn't send any private message]

1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * client.c: Controls clients.
4 *
5 * Copyright (C) 2002 by the past and present ircd coders, and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * $Id$
23 */
24
25 #include "stdinc.h"
26 #include "list.h"
27 #include "client.h"
28 #include "channel_mode.h"
29 #include "event.h"
30 #include "fdlist.h"
31 #include "hash.h"
32 #include "irc_string.h"
33 #include "ircd.h"
34 #include "s_gline.h"
35 #include "numeric.h"
36 #include "packet.h"
37 #include "s_auth.h"
38 #include "s_bsd.h"
39 #include "conf.h"
40 #include "log.h"
41 #include "s_misc.h"
42 #include "s_serv.h"
43 #include "send.h"
44 #include "whowas.h"
45 #include "s_user.h"
46 #include "dbuf.h"
47 #include "memory.h"
48 #include "mempool.h"
49 #include "hostmask.h"
50 #include "listener.h"
51 #include "irc_res.h"
52 #include "userhost.h"
53 #include "watch.h"
54 #include "rng_mt.h"
55
56 dlink_list listing_client_list = { NULL, NULL, 0 };
57 /* Pointer to beginning of Client list */
58 dlink_list global_client_list = {NULL, NULL, 0};
59 /* unknown/client pointer lists */
60 dlink_list unknown_list = {NULL, NULL, 0};
61 dlink_list local_client_list = {NULL, NULL, 0};
62 dlink_list serv_list = {NULL, NULL, 0};
63 dlink_list global_serv_list = {NULL, NULL, 0};
64 dlink_list oper_list = {NULL, NULL, 0};
65
66 static EVH check_pings;
67
68 static mp_pool_t *client_pool = NULL;
69 static mp_pool_t *lclient_pool = NULL;
70
71 static dlink_list dead_list = { NULL, NULL, 0};
72 static dlink_list abort_list = { NULL, NULL, 0};
73
74 static dlink_node *eac_next; /* next aborted client to exit */
75
76 static void check_pings_list(dlink_list *);
77 static void check_unknowns_list(void);
78 static void ban_them(struct Client *, struct MaskItem *);
79
80
81 /* init_client()
82 *
83 * inputs - NONE
84 * output - NONE
85 * side effects - initialize client free memory
86 */
87 void
88 init_client(void)
89 {
90 /* start off the check ping event .. -- adrian
91 * Every 30 seconds is plenty -- db
92 */
93 client_pool = mp_pool_new(sizeof(struct Client), MP_CHUNK_SIZE_CLIENT);
94 lclient_pool = mp_pool_new(sizeof(struct LocalUser), MP_CHUNK_SIZE_LCLIENT);
95 eventAdd("check_pings", check_pings, NULL, 5);
96 }
97
98 /*
99 * make_client - create a new Client struct and set it to initial state.
100 *
101 * from == NULL, create local client (a client connected
102 * to a socket).
103 * WARNING: This leaves the client in a dangerous
104 * state where fd == -1, dead flag is not set and
105 * the client is on the unknown_list; therefore,
106 * the first thing to do after calling make_client(NULL)
107 * is setting fd to something reasonable. -adx
108 *
109 * from, create remote client (behind a socket
110 * associated with the client defined by
111 * 'from'). ('from' is a local client!!).
112 */
113 struct Client *
114 make_client(struct Client *from)
115 {
116 struct Client *client_p = mp_pool_get(client_pool);
117
118 memset(client_p, 0, sizeof(*client_p));
119
120 if (from == NULL)
121 {
122 client_p->from = client_p; /* 'from' of local client is self! */
123 client_p->localClient = mp_pool_get(lclient_pool);
124
125 memset(client_p->localClient, 0, sizeof(*client_p->localClient));
126
127 client_p->localClient->since = CurrentTime;
128 client_p->localClient->lasttime = CurrentTime;
129 client_p->localClient->firsttime = CurrentTime;
130 client_p->localClient->registration = REG_INIT;
131
132 /* as good a place as any... */
133 dlinkAdd(client_p, &client_p->localClient->lclient_node, &unknown_list);
134 }
135 else
136 client_p->from = from; /* 'from' of local client is self! */
137
138 client_p->idhnext = client_p;
139 client_p->hnext = client_p;
140 client_p->status = STAT_UNKNOWN;
141 strcpy(client_p->username, "unknown");
142 strcpy(client_p->svid, "0");
143
144 return client_p;
145 }
146
147 /*
148 * free_client
149 *
150 * inputs - pointer to client
151 * output - NONE
152 * side effects - client pointed to has its memory freed
153 */
154 static void
155 free_client(struct Client *client_p)
156 {
157 assert(client_p != NULL);
158 assert(client_p != &me);
159 assert(client_p->hnext == client_p);
160 assert(client_p->idhnext == client_p);
161 assert(client_p->channel.head == NULL);
162 assert(dlink_list_length(&client_p->channel) == 0);
163 assert(dlink_list_length(&client_p->whowas) == 0);
164 assert(!IsServer(client_p) || (IsServer(client_p) && client_p->serv));
165
166 MyFree(client_p->serv);
167
168 if (MyConnect(client_p))
169 {
170 assert(client_p->localClient->invited.head == NULL);
171 assert(dlink_list_length(&client_p->localClient->invited) == 0);
172 assert(dlink_list_length(&client_p->localClient->watches) == 0);
173 assert(IsClosing(client_p) && IsDead(client_p));
174
175 MyFree(client_p->localClient->response);
176 MyFree(client_p->localClient->auth_oper);
177
178 /*
179 * clean up extra sockets from P-lines which have been discarded.
180 */
181 if (client_p->localClient->listener)
182 {
183 assert(0 < client_p->localClient->listener->ref_count);
184 if (0 == --client_p->localClient->listener->ref_count &&
185 !client_p->localClient->listener->active)
186 free_listener(client_p->localClient->listener);
187 }
188
189 dbuf_clear(&client_p->localClient->buf_recvq);
190 dbuf_clear(&client_p->localClient->buf_sendq);
191
192 mp_pool_release(client_p->localClient);
193 }
194
195 mp_pool_release(client_p);
196 }
197
198 /*
199 * check_pings - go through the local client list and check activity
200 * kill off stuff that should die
201 *
202 * inputs - NOT USED (from event)
203 * output - next time_t when check_pings() should be called again
204 * side effects -
205 *
206 *
207 * A PING can be sent to clients as necessary.
208 *
209 * Client/Server ping outs are handled.
210 */
211
212 /*
213 * Addon from adrian. We used to call this after nextping seconds,
214 * however I've changed it to run once a second. This is only for
215 * PING timeouts, not K/etc-line checks (thanks dianora!). Having it
216 * run once a second makes life a lot easier - when a new client connects
217 * and they need a ping in 4 seconds, if nextping was set to 20 seconds
218 * we end up waiting 20 seconds. This is stupid. :-)
219 * I will optimise (hah!) check_pings() once I've finished working on
220 * tidying up other network IO evilnesses.
221 * -- adrian
222 */
223
224 static void
225 check_pings(void *notused)
226 {
227 check_pings_list(&local_client_list);
228 check_pings_list(&serv_list);
229 check_unknowns_list();
230 }
231
232 /* check_pings_list()
233 *
234 * inputs - pointer to list to check
235 * output - NONE
236 * side effects -
237 */
238 static void
239 check_pings_list(dlink_list *list)
240 {
241 char scratch[32]; /* way too generous but... */
242 int ping = 0; /* ping time value from client */
243 dlink_node *ptr = NULL, *next_ptr = NULL;
244
245 DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
246 {
247 struct Client *client_p = ptr->data;
248
249 /*
250 ** Note: No need to notify opers here. It's
251 ** already done when "FLAGS_DEADSOCKET" is set.
252 */
253 if (IsDead(client_p))
254 {
255 /* Ignore it, its been exited already */
256 continue;
257 }
258
259 if (!IsRegistered(client_p))
260 ping = CONNECTTIMEOUT;
261 else
262 ping = get_client_ping(&client_p->localClient->confs);
263
264 if (ping < CurrentTime - client_p->localClient->lasttime)
265 {
266 if (!IsPingSent(client_p))
267 {
268 /*
269 * if we havent PINGed the connection and we havent
270 * heard from it in a while, PING it to make sure
271 * it is still alive.
272 */
273 SetPingSent(client_p);
274 client_p->localClient->lasttime = CurrentTime - ping;
275 sendto_one(client_p, "PING :%s", ID_or_name(&me, client_p));
276 }
277 else
278 {
279 if (CurrentTime - client_p->localClient->lasttime >= 2 * ping)
280 {
281 /*
282 * If the client/server hasn't talked to us in 2*ping seconds
283 * and it has a ping time, then close its connection.
284 */
285 if (IsServer(client_p) || IsHandshake(client_p))
286 {
287 sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE,
288 "No response from %s, closing link",
289 get_client_name(client_p, HIDE_IP));
290 sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE,
291 "No response from %s, closing link",
292 get_client_name(client_p, MASK_IP));
293 ilog(LOG_TYPE_IRCD, "No response from %s, closing link",
294 get_client_name(client_p, HIDE_IP));
295 }
296
297 snprintf(scratch, sizeof(scratch), "Ping timeout: %d seconds",
298 (int)(CurrentTime - client_p->localClient->lasttime));
299 exit_client(client_p, &me, scratch);
300 }
301 }
302 }
303 }
304 }
305
306 /* check_unknowns_list()
307 *
308 * inputs - pointer to list of unknown clients
309 * output - NONE
310 * side effects - unknown clients get marked for termination after n seconds
311 */
312 static void
313 check_unknowns_list(void)
314 {
315 dlink_node *ptr, *next_ptr;
316
317 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
318 {
319 struct Client *client_p = ptr->data;
320
321 /*
322 * Check UNKNOWN connections - if they have been in this state
323 * for > 30s, close them.
324 */
325 if (IsAuthFinished(client_p) && (CurrentTime - client_p->localClient->firsttime) > 30)
326 exit_client(client_p, &me, "Registration timed out");
327 }
328 }
329
330 /* check_conf_klines()
331 *
332 * inputs - NONE
333 * output - NONE
334 * side effects - Check all connections for a pending kline against the
335 * client, exit the client if a kline matches.
336 */
337 void
338 check_conf_klines(void)
339 {
340 struct Client *client_p = NULL; /* current local client_p being examined */
341 struct MaskItem *conf = NULL;
342 dlink_node *ptr, *next_ptr;
343
344 DLINK_FOREACH_SAFE(ptr, next_ptr, local_client_list.head)
345 {
346 client_p = ptr->data;
347
348 /* If a client is already being exited
349 */
350 if (IsDead(client_p) || !IsClient(client_p))
351 continue;
352
353 if ((conf = find_dline_conf(&client_p->localClient->ip,
354 client_p->localClient->aftype)) != NULL)
355 {
356 if (conf->type == CONF_EXEMPT)
357 continue;
358
359 ban_them(client_p, conf);
360 continue; /* and go examine next fd/client_p */
361 }
362
363 if (ConfigFileEntry.glines && (conf = find_gline(client_p)))
364 {
365 if (IsExemptKline(client_p) ||
366 IsExemptGline(client_p))
367 {
368 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
369 "GLINE over-ruled for %s, client is %sline_exempt",
370 get_client_name(client_p, HIDE_IP), IsExemptKline(client_p) ? "k" : "g");
371 continue;
372 }
373
374 ban_them(client_p, conf);
375 /* and go examine next fd/client_p */
376 continue;
377 }
378
379 if ((conf = find_kill(client_p)) != NULL)
380 {
381 if (IsExemptKline(client_p))
382 {
383 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
384 "KLINE over-ruled for %s, client is kline_exempt",
385 get_client_name(client_p, HIDE_IP));
386 continue;
387 }
388
389 ban_them(client_p, conf);
390 continue;
391 }
392
393 if ((conf = find_matching_name_conf(CONF_XLINE, client_p->info,
394 NULL, NULL, 0)) != NULL ||
395 (conf = find_matching_name_conf(CONF_RXLINE, client_p->info,
396 NULL, NULL, 0)) != NULL)
397 {
398 ban_them(client_p, conf);
399 continue;
400 }
401 }
402
403 /* also check the unknowns list for new dlines */
404 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
405 {
406 client_p = ptr->data;
407
408 if ((conf = find_dline_conf(&client_p->localClient->ip,
409 client_p->localClient->aftype)))
410 {
411 if (conf->type == CONF_EXEMPT)
412 continue;
413
414 exit_client(client_p, &me, "D-lined");
415 }
416 }
417 }
418
419 /*
420 * ban_them
421 *
422 * inputs - pointer to client to ban
423 * - pointer to MaskItem
424 * output - NONE
425 * side effects - given client_p is banned
426 */
427 static void
428 ban_them(struct Client *client_p, struct MaskItem *conf)
429 {
430 const char *user_reason = NULL; /* What is sent to user */
431 const char *type_string = NULL;
432 const char dline_string[] = "D-line";
433 const char kline_string[] = "K-line";
434 const char gline_string[] = "G-line";
435 const char xline_string[] = "X-line";
436
437 switch (conf->type)
438 {
439 case CONF_RKLINE:
440 case CONF_KLINE:
441 type_string = kline_string;
442 break;
443 case CONF_DLINE:
444 type_string = dline_string;
445 break;
446 case CONF_GLINE:
447 type_string = gline_string;
448 break;
449 case CONF_RXLINE:
450 case CONF_XLINE:
451 type_string = xline_string;
452 ++conf->count;
453 break;
454 default:
455 assert(0);
456 break;
457 }
458
459 user_reason = conf->reason ? conf->reason : type_string;
460
461 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE, "%s active for %s",
462 type_string, get_client_name(client_p, HIDE_IP));
463
464 if (IsClient(client_p))
465 sendto_one(client_p, form_str(ERR_YOUREBANNEDCREEP),
466 me.name, client_p->name, user_reason);
467
468 exit_client(client_p, &me, user_reason);
469 }
470
471 /* update_client_exit_stats()
472 *
473 * input - pointer to client
474 * output - NONE
475 * side effects -
476 */
477 static void
478 update_client_exit_stats(struct Client *client_p)
479 {
480 if (IsClient(client_p))
481 {
482 assert(Count.total > 0);
483 --Count.total;
484 if (HasUMode(client_p, UMODE_OPER))
485 --Count.oper;
486 if (HasUMode(client_p, UMODE_INVISIBLE))
487 --Count.invisi;
488 }
489 else if (IsServer(client_p))
490 sendto_realops_flags(UMODE_EXTERNAL, L_ALL, SEND_NOTICE,
491 "Server %s split from %s",
492 client_p->name, client_p->servptr->name);
493
494 if (splitchecking && !splitmode)
495 check_splitmode(NULL);
496 }
497
498 /* find_person()
499 *
500 * inputs - pointer to name
501 * output - return client pointer
502 * side effects - find person by (nick)name
503 */
504 struct Client *
505 find_person(const struct Client *client_p, const char *name)
506 {
507 struct Client *c2ptr = NULL;
508
509 if (IsDigit(*name))
510 {
511 if ((c2ptr = hash_find_id(name)) != NULL)
512 {
513 /* invisible users shall not be found by UID guessing */
514 if (HasUMode(c2ptr, UMODE_INVISIBLE))
515 if (!IsServer(client_p) && !HasFlag(client_p, FLAGS_SERVICE))
516 c2ptr = NULL;
517 }
518 }
519 else
520 c2ptr = hash_find_client(name);
521
522 return ((c2ptr != NULL && IsClient(c2ptr)) ? c2ptr : NULL);
523 }
524
525 /*
526 * find_chasing - find the client structure for a nick name (user)
527 * using history mechanism if necessary. If the client is not found,
528 * an error message (NO SUCH NICK) is generated. If the client was found
529 * through the history, chasing will be 1 and otherwise 0.
530 */
531 struct Client *
532 find_chasing(struct Client *client_p, struct Client *source_p, const char *user, int *chasing)
533 {
534 struct Client *who = find_person(client_p, user);
535
536 if (chasing)
537 *chasing = 0;
538
539 if (who)
540 return who;
541
542 if (IsDigit(*user))
543 return NULL;
544
545 if ((who = get_history(user,
546 (time_t)ConfigFileEntry.kill_chase_time_limit))
547 == NULL)
548 {
549 sendto_one(source_p, form_str(ERR_NOSUCHNICK),
550 me.name, source_p->name, user);
551 return NULL;
552 }
553
554 if (chasing)
555 *chasing = 1;
556
557 return who;
558 }
559
560 /*
561 * get_client_name - Return the name of the client
562 * for various tracking and
563 * admin purposes. The main purpose of this function is to
564 * return the "socket host" name of the client, if that
565 * differs from the advertised name (other than case).
566 * But, this can be used to any client structure.
567 *
568 * NOTE 1:
569 * Watch out the allocation of "nbuf", if either source_p->name
570 * or source_p->sockhost gets changed into pointers instead of
571 * directly allocated within the structure...
572 *
573 * NOTE 2:
574 * Function return either a pointer to the structure (source_p) or
575 * to internal buffer (nbuf). *NEVER* use the returned pointer
576 * to modify what it points!!!
577 */
578 const char *
579 get_client_name(const struct Client *client, enum addr_mask_type type)
580 {
581 static char nbuf[HOSTLEN * 2 + USERLEN + 5];
582
583 assert(client != NULL);
584
585 if (!MyConnect(client))
586 return client->name;
587
588 if (IsServer(client) || IsConnecting(client) || IsHandshake(client))
589 {
590 if (!irccmp(client->name, client->host))
591 return client->name;
592 else if (ConfigServerHide.hide_server_ips)
593 type = MASK_IP;
594 }
595
596 if (ConfigFileEntry.hide_spoof_ips)
597 if (type == SHOW_IP && IsIPSpoof(client))
598 type = MASK_IP;
599
600 /* And finally, let's get the host information, ip or name */
601 switch (type)
602 {
603 case SHOW_IP:
604 snprintf(nbuf, sizeof(nbuf), "%s[%s@%s]",
605 client->name,
606 client->username, client->sockhost);
607 break;
608 case MASK_IP:
609 if (client->localClient->aftype == AF_INET)
610 snprintf(nbuf, sizeof(nbuf), "%s[%s@255.255.255.255]",
611 client->name, client->username);
612 else
613 snprintf(nbuf, sizeof(nbuf), "%s[%s@ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]",
614 client->name, client->username);
615 break;
616 default:
617 snprintf(nbuf, sizeof(nbuf), "%s[%s@%s]",
618 client->name,
619 client->username, client->host);
620 }
621
622 return nbuf;
623 }
624
625 void
626 free_exited_clients(void)
627 {
628 dlink_node *ptr = NULL, *next = NULL;
629
630 DLINK_FOREACH_SAFE(ptr, next, dead_list.head)
631 {
632 free_client(ptr->data);
633 dlinkDelete(ptr, &dead_list);
634 free_dlink_node(ptr);
635 }
636 }
637
638 /*
639 * Exit one client, local or remote. Assuming all dependents have
640 * been already removed, and socket closed for local client.
641 *
642 * The only messages generated are QUITs on channels.
643 */
644 static void
645 exit_one_client(struct Client *source_p, const char *quitmsg)
646 {
647 dlink_node *lp = NULL, *next_lp = NULL;
648
649 assert(!IsMe(source_p));
650
651 if (IsClient(source_p))
652 {
653 if (source_p->servptr->serv != NULL)
654 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->client_list);
655
656 /*
657 * If a person is on a channel, send a QUIT notice
658 * to every client (person) on the same channel (so
659 * that the client can show the "**signoff" message).
660 * (Note: The notice is to the local clients *only*)
661 */
662 sendto_common_channels_local(source_p, 0, 0, ":%s!%s@%s QUIT :%s",
663 source_p->name, source_p->username,
664 source_p->host, quitmsg);
665 DLINK_FOREACH_SAFE(lp, next_lp, source_p->channel.head)
666 remove_user_from_channel(lp->data);
667
668 add_history(source_p, 0);
669 off_history(source_p);
670
671 watch_check_hash(source_p, RPL_LOGOFF);
672
673 if (MyConnect(source_p))
674 {
675 /* Clean up invitefield */
676 DLINK_FOREACH_SAFE(lp, next_lp, source_p->localClient->invited.head)
677 del_invite(lp->data, source_p);
678
679 del_all_accepts(source_p);
680 }
681 }
682 else if (IsServer(source_p))
683 {
684 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->server_list);
685
686 if ((lp = dlinkFindDelete(&global_serv_list, source_p)) != NULL)
687 free_dlink_node(lp);
688 }
689
690 /* Remove source_p from the client lists */
691 if (HasID(source_p))
692 hash_del_id(source_p);
693 if (source_p->name[0])
694 hash_del_client(source_p);
695
696 if (IsUserHostIp(source_p))
697 delete_user_host(source_p->username, source_p->host, !MyConnect(source_p));
698
699 /* remove from global client list
700 * NOTE: source_p->node.next cannot be NULL if the client is added
701 * to global_client_list (there is always &me at its end)
702 */
703 if (source_p != NULL && source_p->node.next != NULL)
704 dlinkDelete(&source_p->node, &global_client_list);
705
706 update_client_exit_stats(source_p);
707
708 /* Check to see if the client isn't already on the dead list */
709 assert(dlinkFind(&dead_list, source_p) == NULL);
710
711 /* add to dead client dlist */
712 SetDead(source_p);
713 dlinkAdd(source_p, make_dlink_node(), &dead_list);
714 }
715
716 /* Recursively send QUITs and SQUITs for source_p and all its dependent clients
717 * and servers to those servers that need them. A server needs the client
718 * QUITs if it can't figure them out from the SQUIT (ie pre-TS4) or if it
719 * isn't getting the SQUIT because of @#(*&@)# hostmasking. With TS4, once
720 * a link gets a SQUIT, it doesn't need any QUIT/SQUITs for clients depending
721 * on that one -orabidoo
722 *
723 * This is now called on each local server -adx
724 */
725 static void
726 recurse_send_quits(struct Client *original_source_p, struct Client *source_p,
727 struct Client *from, struct Client *to, const char *comment,
728 const char *splitstr)
729 {
730 dlink_node *ptr, *next;
731 struct Client *target_p;
732
733 assert(to != source_p); /* should be already removed from serv_list */
734
735 /* If this server can handle quit storm (QS) removal
736 * of dependents, just send the SQUIT
737 */
738 if (!IsCapable(to, CAP_QS))
739 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
740 {
741 target_p = ptr->data;
742 sendto_one(to, ":%s QUIT :%s", target_p->name, splitstr);
743 }
744
745 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
746 recurse_send_quits(original_source_p, ptr->data, from, to,
747 comment, splitstr);
748
749 if ((source_p == original_source_p && to != from) ||
750 !IsCapable(to, CAP_QS))
751 {
752 /* don't use a prefix here - we have to be 100% sure the message
753 * will be accepted without Unknown prefix etc.. */
754 sendto_one(to, "SQUIT %s :%s", ID_or_name(source_p, to), comment);
755 }
756 }
757
758 /*
759 * Remove all clients that depend on source_p; assumes all (S)QUITs have
760 * already been sent. we make sure to exit a server's dependent clients
761 * and servers before the server itself; exit_one_client takes care of
762 * actually removing things off llists. tweaked from +CSr31 -orabidoo
763 */
764 static void
765 recurse_remove_clients(struct Client *source_p, const char *quitmsg)
766 {
767 dlink_node *ptr, *next;
768
769 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
770 exit_one_client(ptr->data, quitmsg);
771
772 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
773 {
774 recurse_remove_clients(ptr->data, quitmsg);
775 exit_one_client(ptr->data, quitmsg);
776 }
777 }
778
779 /*
780 ** Remove *everything* that depends on source_p, from all lists, and sending
781 ** all necessary QUITs and SQUITs. source_p itself is still on the lists,
782 ** and its SQUITs have been sent except for the upstream one -orabidoo
783 */
784 static void
785 remove_dependents(struct Client *source_p, struct Client *from,
786 const char *comment, const char *splitstr)
787 {
788 dlink_node *ptr = NULL;
789
790 DLINK_FOREACH(ptr, serv_list.head)
791 recurse_send_quits(source_p, source_p, from, ptr->data,
792 comment, splitstr);
793
794 recurse_remove_clients(source_p, splitstr);
795 }
796
797 /*
798 * exit_client - exit a client of any type. Generally, you can use
799 * this on any struct Client, regardless of its state.
800 *
801 * Note, you shouldn't exit remote _users_ without first doing
802 * AddFlag(x, FLAGS_KILLED) and propagating a kill or similar message.
803 * However, it is perfectly correct to call exit_client to force a _server_
804 * quit (either local or remote one).
805 *
806 * inputs: - a client pointer that is going to be exited
807 * - for servers, the second argument is a pointer to who
808 * is firing the server. This side won't get any generated
809 * messages. NEVER NULL!
810 * output: none
811 * side effects: the client is delinked from all lists, disconnected,
812 * and the rest of IRC network is notified of the exit.
813 * Client memory is scheduled to be freed
814 */
815 void
816 exit_client(struct Client *source_p, struct Client *from, const char *comment)
817 {
818 dlink_node *m = NULL;
819
820 if (MyConnect(source_p))
821 {
822 /* DO NOT REMOVE. exit_client can be called twice after a failed
823 * read/write.
824 */
825 if (IsClosing(source_p))
826 return;
827
828 SetClosing(source_p);
829
830 if (IsIpHash(source_p))
831 remove_one_ip(&source_p->localClient->ip);
832
833 if (source_p->localClient->auth)
834 {
835 delete_auth(source_p->localClient->auth);
836 source_p->localClient->auth = NULL;
837 }
838
839 /*
840 * This source_p could have status of one of STAT_UNKNOWN, STAT_CONNECTING
841 * STAT_HANDSHAKE or STAT_UNKNOWN
842 * all of which are lumped together into unknown_list
843 *
844 * In all above cases IsRegistered() will not be true.
845 */
846 if (!IsRegistered(source_p))
847 {
848 assert(dlinkFind(&unknown_list, source_p));
849
850 dlinkDelete(&source_p->localClient->lclient_node, &unknown_list);
851 }
852 else if (IsClient(source_p))
853 {
854 time_t on_for = CurrentTime - source_p->localClient->firsttime;
855 assert(Count.local > 0);
856 Count.local--;
857
858 if (HasUMode(source_p, UMODE_OPER))
859 if ((m = dlinkFindDelete(&oper_list, source_p)) != NULL)
860 free_dlink_node(m);
861
862 assert(dlinkFind(&local_client_list, source_p));
863 dlinkDelete(&source_p->localClient->lclient_node, &local_client_list);
864
865 if (source_p->localClient->list_task != NULL)
866 free_list_task(source_p->localClient->list_task, source_p);
867
868 watch_del_watch_list(source_p);
869 sendto_realops_flags(UMODE_CCONN, L_ALL, SEND_NOTICE,
870 "Client exiting: %s (%s@%s) [%s] [%s]",
871 source_p->name, source_p->username, source_p->host, comment,
872 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
873 "255.255.255.255" : source_p->sockhost);
874 sendto_realops_flags(UMODE_CCONN_FULL, L_ALL, SEND_NOTICE,
875 "CLIEXIT: %s %s %s %s 0 %s",
876 source_p->name,
877 source_p->username,
878 source_p->host,
879 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
880 "255.255.255.255" : source_p->sockhost,
881 comment);
882 ilog(LOG_TYPE_USER, "%s (%3u:%02u:%02u): %s!%s@%s %llu/%llu",
883 myctime(source_p->localClient->firsttime), (unsigned int)(on_for / 3600),
884 (unsigned int)((on_for % 3600)/60), (unsigned int)(on_for % 60),
885 source_p->name, source_p->username, source_p->host,
886 source_p->localClient->send.bytes>>10,
887 source_p->localClient->recv.bytes>>10);
888 }
889 else if (IsServer(source_p))
890 {
891 assert(Count.myserver > 0);
892 --Count.myserver;
893
894 assert(dlinkFind(&serv_list, source_p));
895 dlinkDelete(&source_p->localClient->lclient_node, &serv_list);
896 unset_chcap_usage_counts(source_p);
897 }
898
899 if (!IsDead(source_p))
900 {
901 if (IsServer(source_p))
902 {
903 /* for them, we are exiting the network */
904 sendto_one(source_p, ":%s SQUIT %s :%s",
905 ID_or_name(from, source_p), me.name, comment);
906 }
907
908 sendto_one(source_p, "ERROR :Closing Link: %s (%s)",
909 source_p->host, comment);
910 }
911
912 /*
913 ** Currently only server connections can have
914 ** depending remote clients here, but it does no
915 ** harm to check for all local clients. In
916 ** future some other clients than servers might
917 ** have remotes too...
918 **
919 ** Close the Client connection first and mark it
920 ** so that no messages are attempted to send to it.
921 ** Remember it makes source_p->from == NULL.
922 */
923 close_connection(source_p);
924 }
925
926 if (IsServer(source_p))
927 {
928 char splitstr[HOSTLEN + HOSTLEN + 2];
929
930 /* This shouldn't ever happen */
931 assert(source_p->serv != NULL && source_p->servptr != NULL);
932
933 if (ConfigServerHide.hide_servers)
934 /*
935 * Set netsplit message to "*.net *.split" to still show
936 * that its a split, but hide the servers splitting
937 */
938 strcpy(splitstr, "*.net *.split");
939 else
940 snprintf(splitstr, sizeof(splitstr), "%s %s",
941 source_p->servptr->name, source_p->name);
942
943 remove_dependents(source_p, from->from, comment, splitstr);
944
945 if (source_p->servptr == &me)
946 {
947 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
948 "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
949 source_p->name, (int)(CurrentTime - source_p->localClient->firsttime),
950 source_p->localClient->send.bytes >> 10,
951 source_p->localClient->recv.bytes >> 10);
952 ilog(LOG_TYPE_IRCD, "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
953 source_p->name, (int)(CurrentTime - source_p->localClient->firsttime),
954 source_p->localClient->send.bytes >> 10,
955 source_p->localClient->recv.bytes >> 10);
956 }
957 }
958 else if (IsClient(source_p) && !HasFlag(source_p, FLAGS_KILLED))
959 {
960 sendto_server(from->from, CAP_TS6, NOCAPS,
961 ":%s QUIT :%s", ID(source_p), comment);
962 sendto_server(from->from, NOCAPS, CAP_TS6,
963 ":%s QUIT :%s", source_p->name, comment);
964 }
965
966 /* The client *better* be off all of the lists */
967 assert(dlinkFind(&unknown_list, source_p) == NULL);
968 assert(dlinkFind(&local_client_list, source_p) == NULL);
969 assert(dlinkFind(&serv_list, source_p) == NULL);
970 assert(dlinkFind(&oper_list, source_p) == NULL);
971
972 exit_one_client(source_p, comment);
973 }
974
975 /*
976 * dead_link_on_write - report a write error if not already dead,
977 * mark it as dead then exit it
978 */
979 void
980 dead_link_on_write(struct Client *client_p, int ierrno)
981 {
982 dlink_node *ptr;
983
984 if (IsDefunct(client_p))
985 return;
986
987 dbuf_clear(&client_p->localClient->buf_recvq);
988 dbuf_clear(&client_p->localClient->buf_sendq);
989
990 assert(dlinkFind(&abort_list, client_p) == NULL);
991 ptr = make_dlink_node();
992 /* don't let exit_aborted_clients() finish yet */
993 dlinkAddTail(client_p, ptr, &abort_list);
994
995 if (eac_next == NULL)
996 eac_next = ptr;
997
998 SetDead(client_p); /* You are dead my friend */
999 }
1000
1001 /*
1002 * dead_link_on_read - report a read error if not already dead,
1003 * mark it as dead then exit it
1004 */
1005 void
1006 dead_link_on_read(struct Client *client_p, int error)
1007 {
1008 char errmsg[255];
1009 int current_error;
1010
1011 if (IsDefunct(client_p))
1012 return;
1013
1014 dbuf_clear(&client_p->localClient->buf_recvq);
1015 dbuf_clear(&client_p->localClient->buf_sendq);
1016
1017 current_error = get_sockerr(client_p->localClient->fd.fd);
1018
1019 if (IsServer(client_p) || IsHandshake(client_p))
1020 {
1021 int connected = CurrentTime - client_p->localClient->firsttime;
1022
1023 if (error == 0)
1024 {
1025 /* Admins get the real IP */
1026 sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE,
1027 "Server %s closed the connection",
1028 get_client_name(client_p, SHOW_IP));
1029
1030 /* Opers get a masked IP */
1031 sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE,
1032 "Server %s closed the connection",
1033 get_client_name(client_p, MASK_IP));
1034
1035 ilog(LOG_TYPE_IRCD, "Server %s closed the connection",
1036 get_client_name(client_p, SHOW_IP));
1037 }
1038 else
1039 {
1040 report_error(L_ADMIN, "Lost connection to %s: %s",
1041 get_client_name(client_p, SHOW_IP), current_error);
1042 report_error(L_OPER, "Lost connection to %s: %s",
1043 get_client_name(client_p, MASK_IP), current_error);
1044 }
1045
1046 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
1047 "%s had been connected for %d day%s, %2d:%02d:%02d",
1048 client_p->name, connected/86400,
1049 (connected/86400 == 1) ? "" : "s",
1050 (connected % 86400) / 3600, (connected % 3600) / 60,
1051 connected % 60);
1052 }
1053
1054 if (error == 0)
1055 strlcpy(errmsg, "Remote host closed the connection",
1056 sizeof(errmsg));
1057 else
1058 snprintf(errmsg, sizeof(errmsg), "Read error: %s",
1059 strerror(current_error));
1060
1061 exit_client(client_p, &me, errmsg);
1062 }
1063
1064 void
1065 exit_aborted_clients(void)
1066 {
1067 dlink_node *ptr;
1068 struct Client *target_p;
1069 const char *notice;
1070
1071 DLINK_FOREACH_SAFE(ptr, eac_next, abort_list.head)
1072 {
1073 target_p = ptr->data;
1074 eac_next = ptr->next;
1075
1076 if (target_p == NULL)
1077 {
1078 sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE,
1079 "Warning: null client on abort_list!");
1080 dlinkDelete(ptr, &abort_list);
1081 free_dlink_node(ptr);
1082 continue;
1083 }
1084
1085 dlinkDelete(ptr, &abort_list);
1086
1087 if (IsSendQExceeded(target_p))
1088 notice = "Max SendQ exceeded";
1089 else
1090 notice = "Write error: connection closed";
1091
1092 exit_client(target_p, &me, notice);
1093 free_dlink_node(ptr);
1094 }
1095 }
1096
1097 /*
1098 * accept processing, this adds a form of "caller ID" to ircd
1099 *
1100 * If a client puts themselves into "caller ID only" mode,
1101 * only clients that match a client pointer they have put on
1102 * the accept list will be allowed to message them.
1103 *
1104 * Diane Bruce, "Dianora" db@db.net
1105 */
1106
1107 void
1108 del_accept(struct split_nuh_item *accept_p, struct Client *client_p)
1109 {
1110 dlinkDelete(&accept_p->node, &client_p->localClient->acceptlist);
1111
1112 MyFree(accept_p->nickptr);
1113 MyFree(accept_p->userptr);
1114 MyFree(accept_p->hostptr);
1115 MyFree(accept_p);
1116 }
1117
1118 struct split_nuh_item *
1119 find_accept(const char *nick, const char *user,
1120 const char *host, struct Client *client_p, int do_match)
1121 {
1122 dlink_node *ptr = NULL;
1123 /* XXX We wouldn't need that if match() would return 0 on match */
1124 int (*cmpfunc)(const char *, const char *) = do_match ? match : irccmp;
1125
1126 DLINK_FOREACH(ptr, client_p->localClient->acceptlist.head)
1127 {
1128 struct split_nuh_item *accept_p = ptr->data;
1129
1130 if (!cmpfunc(accept_p->nickptr, nick) &&
1131 !cmpfunc(accept_p->userptr, user) &&
1132 !cmpfunc(accept_p->hostptr, host))
1133 return accept_p;
1134 }
1135
1136 return NULL;
1137 }
1138
1139 /* accept_message()
1140 *
1141 * inputs - pointer to source client
1142 * - pointer to target client
1143 * output - 1 if accept this message 0 if not
1144 * side effects - See if source is on target's allow list
1145 */
1146 int
1147 accept_message(struct Client *source,
1148 struct Client *target)
1149 {
1150 dlink_node *ptr = NULL;
1151
1152 if (source == target || find_accept(source->name, source->username,
1153 source->host, target, 1))
1154 return 1;
1155
1156 if (HasUMode(target, UMODE_SOFTCALLERID))
1157 DLINK_FOREACH(ptr, target->channel.head)
1158 if (IsMember(source, ((struct Membership *)ptr->data)->chptr))
1159 return 1;
1160
1161 return 0;
1162 }
1163
1164 /* del_all_accepts()
1165 *
1166 * inputs - pointer to exiting client
1167 * output - NONE
1168 * side effects - Walk through given clients acceptlist and remove all entries
1169 */
1170 void
1171 del_all_accepts(struct Client *client_p)
1172 {
1173 dlink_node *ptr = NULL, *next_ptr = NULL;
1174
1175 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->localClient->acceptlist.head)
1176 del_accept(ptr->data, client_p);
1177 }
1178
1179 unsigned int
1180 idle_time_get(const struct Client *source_p, const struct Client *target_p)
1181 {
1182 unsigned int idle = 0;
1183 unsigned int min_idle = 0;
1184 unsigned int max_idle = 0;
1185 struct ClassItem *class = get_class_ptr(&target_p->localClient->confs);
1186
1187 if (!(class->flags & CLASS_FLAGS_FAKE_IDLE) || target_p == source_p)
1188 return CurrentTime - target_p->localClient->last_privmsg;
1189 if (HasUMode(source_p, UMODE_OPER) &&
1190 !(class->flags & CLASS_FLAGS_HIDE_IDLE_FROM_OPERS))
1191 return CurrentTime - target_p->localClient->last_privmsg;
1192
1193 min_idle = class->min_idle;
1194 max_idle = class->max_idle;
1195
1196 if (min_idle == max_idle)
1197 return min_idle;
1198
1199 if (class->flags & CLASS_FLAGS_RANDOM_IDLE)
1200 idle = genrand_int32();
1201 else
1202 idle = CurrentTime - target_p->localClient->last_privmsg;
1203
1204 if (max_idle == 0)
1205 idle = 0;
1206 else
1207 idle %= max_idle;
1208
1209 if (idle < min_idle)
1210 idle = min_idle + (idle % (max_idle - min_idle));
1211
1212 return idle;
1213 }

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