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Revision 2381 - (show annotations)
Sat Jul 6 16:22:05 2013 UTC (9 years, 1 month ago) by michael
File MIME type: text/x-chdr
File size: 35960 byte(s)
- Add NEWIO branch

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

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