/[svn]/ircd-hybrid-7.2/src/client.c
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Contents of /ircd-hybrid-7.2/src/client.c

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Revision 1013 - (show annotations)
Sun Oct 18 14:26:49 2009 UTC (11 years, 4 months ago) by michael
File MIME type: text/x-chdr
File size: 39670 byte(s)
- Add -Wextra -Wcast-align -Wbad-function-cast to CFLAGS if --enable-warnings is specified
- Fixed several compile warnings
- 64-bit cleanliness fixes, e.g., reorganize data structures to reduce storage/unnecessary padding

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 "common.h"
30 #include "event.h"
31 #include "fdlist.h"
32 #include "hash.h"
33 #include "irc_string.h"
34 #include "sprintf_irc.h"
35 #include "ircd.h"
36 #include "s_gline.h"
37 #include "numeric.h"
38 #include "packet.h"
39 #include "s_auth.h"
40 #include "s_bsd.h"
41 #include "s_conf.h"
42 #include "s_log.h"
43 #include "s_misc.h"
44 #include "s_serv.h"
45 #include "send.h"
46 #include "whowas.h"
47 #include "s_user.h"
48 #include "dbuf.h"
49 #include "memory.h"
50 #include "hostmask.h"
51 #include "balloc.h"
52 #include "listener.h"
53 #include "irc_res.h"
54 #include "userhost.h"
55 #include "watch.h"
56
57 dlink_list listing_client_list = { NULL, NULL, 0 };
58 /* Pointer to beginning of Client list */
59 dlink_list global_client_list = {NULL, NULL, 0};
60 /* unknown/client pointer lists */
61 dlink_list unknown_list = {NULL, NULL, 0};
62 dlink_list local_client_list = {NULL, NULL, 0};
63 dlink_list serv_list = {NULL, NULL, 0};
64 dlink_list global_serv_list = {NULL, NULL, 0};
65 dlink_list oper_list = {NULL, NULL, 0};
66
67 static EVH check_pings;
68
69 static BlockHeap *client_heap = NULL;
70 static BlockHeap *lclient_heap = NULL;
71
72 static dlink_list dead_list = { NULL, NULL, 0};
73 static dlink_list abort_list = { NULL, NULL, 0};
74
75 static dlink_node *eac_next; /* next aborted client to exit */
76
77 static void check_pings_list(dlink_list *);
78 static void check_unknowns_list(void);
79 static void ban_them(struct Client *client_p, struct ConfItem *conf);
80
81
82 /* init_client()
83 *
84 * inputs - NONE
85 * output - NONE
86 * side effects - initialize client free memory
87 */
88 void
89 init_client(void)
90 {
91 /* start off the check ping event .. -- adrian
92 * Every 30 seconds is plenty -- db
93 */
94 client_heap = BlockHeapCreate("client", sizeof(struct Client), CLIENT_HEAP_SIZE);
95 lclient_heap = BlockHeapCreate("local client", sizeof(struct LocalUser), LCLIENT_HEAP_SIZE);
96 eventAdd("check_pings", check_pings, NULL, 5);
97 }
98
99 /*
100 * make_client - create a new Client struct and set it to initial state.
101 *
102 * from == NULL, create local client (a client connected
103 * to a socket).
104 * WARNING: This leaves the client in a dangerous
105 * state where fd == -1, dead flag is not set and
106 * the client is on the unknown_list; therefore,
107 * the first thing to do after calling make_client(NULL)
108 * is setting fd to something reasonable. -adx
109 *
110 * from, create remote client (behind a socket
111 * associated with the client defined by
112 * 'from'). ('from' is a local client!!).
113 */
114 struct Client *
115 make_client(struct Client *from)
116 {
117 struct Client *client_p = BlockHeapAlloc(client_heap);
118
119 if (from == NULL)
120 {
121 client_p->from = client_p; /* 'from' of local client is self! */
122 client_p->since = client_p->lasttime = client_p->firsttime = CurrentTime;
123
124 client_p->localClient = BlockHeapAlloc(lclient_heap);
125 client_p->localClient->registration = REG_INIT;
126 /* as good a place as any... */
127 dlinkAdd(client_p, make_dlink_node(), &unknown_list);
128 }
129 else
130 client_p->from = from; /* 'from' of local client is self! */
131
132 client_p->hnext = client_p;
133 client_p->status = STAT_UNKNOWN;
134 strcpy(client_p->username, "unknown");
135
136 return client_p;
137 }
138
139 /*
140 * free_client
141 *
142 * inputs - pointer to client
143 * output - NONE
144 * side effects - client pointed to has its memory freed
145 */
146 static void
147 free_client(struct Client *client_p)
148 {
149 assert(client_p != NULL);
150 assert(client_p != &me);
151 assert(client_p->hnext == client_p);
152 assert(client_p->channel.head == NULL);
153 assert(dlink_list_length(&client_p->channel) == 0);
154
155 MyFree(client_p->away);
156 MyFree(client_p->serv);
157
158 if (MyConnect(client_p))
159 {
160 assert(client_p->localClient->invited.head == NULL);
161 assert(dlink_list_length(&client_p->localClient->invited) == 0);
162 assert(IsClosing(client_p) && IsDead(client_p));
163
164 MyFree(client_p->localClient->response);
165 MyFree(client_p->localClient->auth_oper);
166
167 /*
168 * clean up extra sockets from P-lines which have been discarded.
169 */
170 if (client_p->localClient->listener)
171 {
172 assert(0 < client_p->localClient->listener->ref_count);
173 if (0 == --client_p->localClient->listener->ref_count &&
174 !client_p->localClient->listener->active)
175 free_listener(client_p->localClient->listener);
176 }
177
178 dbuf_clear(&client_p->localClient->buf_recvq);
179 dbuf_clear(&client_p->localClient->buf_sendq);
180
181 BlockHeapFree(lclient_heap, client_p->localClient);
182 }
183
184 BlockHeapFree(client_heap, client_p);
185 }
186
187 /*
188 * check_pings - go through the local client list and check activity
189 * kill off stuff that should die
190 *
191 * inputs - NOT USED (from event)
192 * output - next time_t when check_pings() should be called again
193 * side effects -
194 *
195 *
196 * A PING can be sent to clients as necessary.
197 *
198 * Client/Server ping outs are handled.
199 */
200
201 /*
202 * Addon from adrian. We used to call this after nextping seconds,
203 * however I've changed it to run once a second. This is only for
204 * PING timeouts, not K/etc-line checks (thanks dianora!). Having it
205 * run once a second makes life a lot easier - when a new client connects
206 * and they need a ping in 4 seconds, if nextping was set to 20 seconds
207 * we end up waiting 20 seconds. This is stupid. :-)
208 * I will optimise (hah!) check_pings() once I've finished working on
209 * tidying up other network IO evilnesses.
210 * -- adrian
211 */
212
213 static void
214 check_pings(void *notused)
215 {
216 check_pings_list(&local_client_list);
217 check_pings_list(&serv_list);
218 check_unknowns_list();
219 }
220
221 /* check_pings_list()
222 *
223 * inputs - pointer to list to check
224 * output - NONE
225 * side effects -
226 */
227 static void
228 check_pings_list(dlink_list *list)
229 {
230 char scratch[32]; /* way too generous but... */
231 struct Client *client_p; /* current local client_p being examined */
232 int ping, pingwarn; /* ping time value from client */
233 dlink_node *ptr, *next_ptr;
234
235 DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
236 {
237 client_p = ptr->data;
238
239 /*
240 ** Note: No need to notify opers here. It's
241 ** already done when "FLAGS_DEADSOCKET" is set.
242 */
243 if (IsDead(client_p))
244 {
245 /* Ignore it, its been exited already */
246 continue;
247 }
248
249 if (client_p->localClient->reject_delay > 0)
250 {
251 if (client_p->localClient->reject_delay <= CurrentTime)
252 exit_client(client_p, &me, "Rejected");
253 continue;
254 }
255
256 if (GlobalSetOptions.idletime && IsClient(client_p))
257 {
258 if (!IsExemptKline(client_p) && !IsOper(client_p) &&
259 !IsIdlelined(client_p) &&
260 ((CurrentTime - client_p->localClient->last) > GlobalSetOptions.idletime))
261 {
262 struct ConfItem *conf;
263 struct AccessItem *aconf;
264
265 conf = make_conf_item(KLINE_TYPE);
266 aconf = map_to_conf(conf);
267
268 DupString(aconf->host, client_p->host);
269 DupString(aconf->reason, "idle exceeder");
270 DupString(aconf->user, client_p->username);
271 aconf->hold = CurrentTime + 60;
272 add_temp_line(conf);
273
274 sendto_realops_flags(UMODE_ALL, L_ALL,
275 "Idle time limit exceeded for %s - temp k-lining",
276 get_client_name(client_p, HIDE_IP));
277 exit_client(client_p, &me, aconf->reason);
278 continue;
279 }
280 }
281
282 if (!IsRegistered(client_p))
283 ping = CONNECTTIMEOUT, pingwarn = 0;
284 else
285 ping = get_client_ping(client_p, &pingwarn);
286
287 if (ping < CurrentTime - client_p->lasttime)
288 {
289 if (!IsPingSent(client_p))
290 {
291 /*
292 * if we havent PINGed the connection and we havent
293 * heard from it in a while, PING it to make sure
294 * it is still alive.
295 */
296 SetPingSent(client_p);
297 ClearPingWarning(client_p);
298 client_p->lasttime = CurrentTime - ping;
299 sendto_one(client_p, "PING :%s", ID_or_name(&me, client_p));
300 }
301 else
302 {
303 if (CurrentTime - client_p->lasttime >= 2 * ping)
304 {
305 /*
306 * If the client/server hasn't talked to us in 2*ping seconds
307 * and it has a ping time, then close its connection.
308 */
309 if (IsServer(client_p) || IsHandshake(client_p))
310 {
311 sendto_realops_flags(UMODE_ALL, L_ADMIN,
312 "No response from %s, closing link",
313 get_client_name(client_p, HIDE_IP));
314 sendto_realops_flags(UMODE_ALL, L_OPER,
315 "No response from %s, closing link",
316 get_client_name(client_p, MASK_IP));
317 ilog(L_NOTICE, "No response from %s, closing link",
318 get_client_name(client_p, HIDE_IP));
319 }
320
321 ircsprintf(scratch, "Ping timeout: %d seconds",
322 (int)(CurrentTime - client_p->lasttime));
323 exit_client(client_p, &me, scratch);
324 }
325 else if (!IsPingWarning(client_p) && pingwarn > 0 &&
326 (IsServer(client_p) || IsHandshake(client_p)) &&
327 CurrentTime - client_p->lasttime >= ping + pingwarn)
328 {
329 /*
330 * If the server hasn't replied in pingwarn seconds after sending
331 * the PING, notify the opers so that they are aware of the problem.
332 */
333 SetPingWarning(client_p);
334 sendto_realops_flags(UMODE_ALL, L_ADMIN,
335 "Warning, no response from %s in %d seconds",
336 get_client_name(client_p, HIDE_IP), pingwarn);
337 sendto_realops_flags(UMODE_ALL, L_OPER,
338 "Warning, no response from %s in %d seconds",
339 get_client_name(client_p, MASK_IP), pingwarn);
340 ilog(L_NOTICE, "No response from %s in %d seconds",
341 get_client_name(client_p, HIDE_IP), pingwarn);
342 }
343 }
344 }
345 }
346 }
347
348 /* check_unknowns_list()
349 *
350 * inputs - pointer to list of unknown clients
351 * output - NONE
352 * side effects - unknown clients get marked for termination after n seconds
353 */
354 static void
355 check_unknowns_list(void)
356 {
357 dlink_node *ptr, *next_ptr;
358
359 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
360 {
361 struct Client *client_p = ptr->data;
362
363 if (client_p->localClient->reject_delay > 0)
364 {
365 if (client_p->localClient->reject_delay <= CurrentTime)
366 exit_client(client_p, &me, "Rejected");
367 continue;
368 }
369
370 /*
371 * Check UNKNOWN connections - if they have been in this state
372 * for > 30s, close them.
373 */
374 if (IsAuthFinished(client_p) && (CurrentTime - client_p->firsttime) > 30)
375 exit_client(client_p, &me, "Registration timed out");
376 }
377 }
378
379 /* check_conf_klines()
380 *
381 * inputs - NONE
382 * output - NONE
383 * side effects - Check all connections for a pending kline against the
384 * client, exit the client if a kline matches.
385 */
386 void
387 check_conf_klines(void)
388 {
389 struct Client *client_p = NULL; /* current local client_p being examined */
390 struct AccessItem *aconf = NULL;
391 struct ConfItem *conf = NULL;
392 dlink_node *ptr, *next_ptr;
393
394 DLINK_FOREACH_SAFE(ptr, next_ptr, local_client_list.head)
395 {
396 client_p = ptr->data;
397
398 /* If a client is already being exited
399 */
400 if (IsDead(client_p) || !IsClient(client_p))
401 continue;
402
403 /* if there is a returned struct ConfItem then kill it */
404 if ((aconf = find_dline_conf(&client_p->localClient->ip,
405 client_p->localClient->aftype)) != NULL)
406 {
407 if (aconf->status & CONF_EXEMPTDLINE)
408 continue;
409
410 conf = unmap_conf_item(aconf);
411 ban_them(client_p, conf);
412 continue; /* and go examine next fd/client_p */
413 }
414
415 if (ConfigFileEntry.glines && (aconf = find_gline(client_p)))
416 {
417 if (IsExemptKline(client_p) ||
418 IsExemptGline(client_p))
419 {
420 sendto_realops_flags(UMODE_ALL, L_ALL,
421 "GLINE over-ruled for %s, client is %sline_exempt",
422 get_client_name(client_p, HIDE_IP), IsExemptKline(client_p) ? "k" : "g");
423 continue;
424 }
425
426 conf = unmap_conf_item(aconf);
427 ban_them(client_p, conf);
428 /* and go examine next fd/client_p */
429 continue;
430 }
431
432 if ((aconf = find_kill(client_p)) != NULL)
433 {
434
435 /* if there is a returned struct AccessItem.. then kill it */
436 if (IsExemptKline(client_p))
437 {
438 sendto_realops_flags(UMODE_ALL, L_ALL,
439 "KLINE over-ruled for %s, client is kline_exempt",
440 get_client_name(client_p, HIDE_IP));
441 continue;
442 }
443
444 conf = unmap_conf_item(aconf);
445 ban_them(client_p, conf);
446 continue;
447 }
448
449 /* if there is a returned struct MatchItem then kill it */
450 if ((conf = find_matching_name_conf(XLINE_TYPE, client_p->info,
451 NULL, NULL, 0)) != NULL ||
452 (conf = find_matching_name_conf(RXLINE_TYPE, client_p->info,
453 NULL, NULL, 0)) != NULL)
454 {
455 ban_them(client_p, conf);
456 continue;
457 }
458 }
459
460 /* also check the unknowns list for new dlines */
461 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
462 {
463 client_p = ptr->data;
464
465 if ((aconf = find_dline_conf(&client_p->localClient->ip,
466 client_p->localClient->aftype)))
467 {
468 if (aconf->status & CONF_EXEMPTDLINE)
469 continue;
470
471 exit_client(client_p, &me, "D-lined");
472 }
473 }
474 }
475
476 /*
477 * ban_them
478 *
479 * inputs - pointer to client to ban
480 * - pointer to ConfItem
481 * output - NONE
482 * side effects - given client_p is banned
483 */
484 static void
485 ban_them(struct Client *client_p, struct ConfItem *conf)
486 {
487 const char *user_reason = NULL; /* What is sent to user */
488 const char *channel_reason = NULL; /* What is sent to channel */
489 struct AccessItem *aconf = NULL;
490 struct MatchItem *xconf = NULL;
491 const char *type_string = NULL;
492 const char dline_string[] = "D-line";
493 const char kline_string[] = "K-line";
494 const char gline_string[] = "G-line";
495 const char xline_string[] = "X-line";
496
497 switch (conf->type)
498 {
499 case RKLINE_TYPE:
500 case KLINE_TYPE:
501 type_string = kline_string;
502 aconf = map_to_conf(conf);
503 break;
504 case DLINE_TYPE:
505 type_string = dline_string;
506 aconf = map_to_conf(conf);
507 break;
508 case GLINE_TYPE:
509 type_string = gline_string;
510 aconf = map_to_conf(conf);
511 break;
512 case RXLINE_TYPE:
513 case XLINE_TYPE:
514 type_string = xline_string;
515 xconf = map_to_conf(conf);
516 ++xconf->count;
517 break;
518 default:
519 assert(0);
520 break;
521 }
522
523 if (ConfigFileEntry.kline_with_reason)
524 {
525 if (aconf != NULL)
526 user_reason = aconf->reason ? aconf->reason : type_string;
527 if (xconf != NULL)
528 user_reason = xconf->reason ? xconf->reason : type_string;
529 }
530 else
531 user_reason = type_string;
532
533 if (ConfigFileEntry.kline_reason != NULL)
534 channel_reason = ConfigFileEntry.kline_reason;
535 else
536 channel_reason = user_reason;
537
538 sendto_realops_flags(UMODE_ALL, L_ALL, "%s active for %s",
539 type_string, get_client_name(client_p, HIDE_IP));
540
541 if (IsClient(client_p))
542 sendto_one(client_p, form_str(ERR_YOUREBANNEDCREEP),
543 me.name, client_p->name, user_reason);
544
545 exit_client(client_p, &me, channel_reason);
546 }
547
548 /* update_client_exit_stats()
549 *
550 * input - pointer to client
551 * output - NONE
552 * side effects -
553 */
554 static void
555 update_client_exit_stats(struct Client *client_p)
556 {
557 if (IsServer(client_p))
558 {
559 sendto_realops_flags(UMODE_EXTERNAL, L_ALL, "Server %s split from %s",
560 client_p->name, client_p->servptr->name);
561 }
562 else if (IsClient(client_p))
563 {
564 assert(Count.total > 0);
565 --Count.total;
566 if (IsOper(client_p))
567 --Count.oper;
568 if (IsInvisible(client_p))
569 --Count.invisi;
570 }
571
572 if (splitchecking && !splitmode)
573 check_splitmode(NULL);
574 }
575
576 /* find_person()
577 *
578 * inputs - pointer to name
579 * output - return client pointer
580 * side effects - find person by (nick)name
581 */
582 /* XXX - ugly wrapper */
583 struct Client *
584 find_person(const struct Client *client_p, const char *name)
585 {
586 struct Client *c2ptr;
587
588 if (IsDigit(*name))
589 {
590 if ((c2ptr = hash_find_id(name)) != NULL)
591 {
592 /* invisible users shall not be found by UID guessing */
593 if (IsInvisible(c2ptr) && !IsServer(client_p))
594 c2ptr = NULL;
595 }
596 }
597 else
598 c2ptr = find_client(name);
599
600 return ((c2ptr != NULL && IsClient(c2ptr)) ? c2ptr : NULL);
601 }
602
603 /*
604 * find_chasing - find the client structure for a nick name (user)
605 * using history mechanism if necessary. If the client is not found,
606 * an error message (NO SUCH NICK) is generated. If the client was found
607 * through the history, chasing will be 1 and otherwise 0.
608 */
609 struct Client *
610 find_chasing(struct Client *client_p, struct Client *source_p, const char *user, int *chasing)
611 {
612 struct Client *who = find_person(client_p, user);
613
614 if (chasing)
615 *chasing = 0;
616
617 if (who)
618 return(who);
619
620 if (IsDigit(*user))
621 return(NULL);
622
623 if ((who = get_history(user,
624 (time_t)ConfigFileEntry.kill_chase_time_limit))
625 == NULL)
626 {
627 sendto_one(source_p, form_str(ERR_NOSUCHNICK),
628 me.name, source_p->name, user);
629 return(NULL);
630 }
631
632 if (chasing)
633 *chasing = 1;
634
635 return(who);
636 }
637
638 /*
639 * get_client_name - Return the name of the client
640 * for various tracking and
641 * admin purposes. The main purpose of this function is to
642 * return the "socket host" name of the client, if that
643 * differs from the advertised name (other than case).
644 * But, this can be used to any client structure.
645 *
646 * NOTE 1:
647 * Watch out the allocation of "nbuf", if either source_p->name
648 * or source_p->sockhost gets changed into pointers instead of
649 * directly allocated within the structure...
650 *
651 * NOTE 2:
652 * Function return either a pointer to the structure (source_p) or
653 * to internal buffer (nbuf). *NEVER* use the returned pointer
654 * to modify what it points!!!
655 */
656 const char *
657 get_client_name(struct Client *client, int showip)
658 {
659 static char nbuf[HOSTLEN * 2 + USERLEN + 5];
660
661 assert(client != NULL);
662
663 if (irccmp(client->name, client->host) == 0)
664 return(client->name);
665
666 if (ConfigServerHide.hide_server_ips)
667 if (IsServer(client) || IsConnecting(client) || IsHandshake(client))
668 showip = MASK_IP;
669
670 if (ConfigFileEntry.hide_spoof_ips)
671 if (showip == SHOW_IP && IsIPSpoof(client))
672 showip = MASK_IP;
673
674 /* And finally, let's get the host information, ip or name */
675 switch (showip)
676 {
677 case SHOW_IP:
678 if (MyConnect(client))
679 {
680 ircsprintf(nbuf, "%s[%s@%s]", client->name, client->username,
681 client->sockhost);
682 break;
683 }
684 case MASK_IP:
685 ircsprintf(nbuf, "%s[%s@255.255.255.255]", client->name,
686 client->username);
687 break;
688 default:
689 ircsprintf(nbuf, "%s[%s@%s]", client->name, client->username,
690 client->host);
691 }
692
693 return(nbuf);
694 }
695
696 void
697 free_exited_clients(void)
698 {
699 dlink_node *ptr = NULL, *next = NULL;
700
701 DLINK_FOREACH_SAFE(ptr, next, dead_list.head)
702 {
703 free_client(ptr->data);
704 dlinkDelete(ptr, &dead_list);
705 free_dlink_node(ptr);
706 }
707 }
708
709 /*
710 * Exit one client, local or remote. Assuming all dependents have
711 * been already removed, and socket closed for local client.
712 *
713 * The only messages generated are QUITs on channels.
714 */
715 static void
716 exit_one_client(struct Client *source_p, const char *quitmsg)
717 {
718 dlink_node *lp = NULL, *next_lp = NULL;
719
720 assert(!IsMe(source_p));
721
722 if (IsServer(source_p))
723 {
724 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->server_list);
725
726 if ((lp = dlinkFindDelete(&global_serv_list, source_p)) != NULL)
727 free_dlink_node(lp);
728 }
729 else if (IsClient(source_p))
730 {
731 if (source_p->servptr->serv != NULL)
732 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->client_list);
733
734 /* If a person is on a channel, send a QUIT notice
735 ** to every client (person) on the same channel (so
736 ** that the client can show the "**signoff" message).
737 ** (Note: The notice is to the local clients *only*)
738 */
739 sendto_common_channels_local(source_p, 0, ":%s!%s@%s QUIT :%s",
740 source_p->name, source_p->username,
741 source_p->host, quitmsg);
742 DLINK_FOREACH_SAFE(lp, next_lp, source_p->channel.head)
743 remove_user_from_channel(lp->data);
744
745 add_history(source_p, 0);
746 off_history(source_p);
747
748 watch_check_hash(source_p, RPL_LOGOFF);
749
750 if (MyConnect(source_p))
751 {
752 /* Clean up invitefield */
753 DLINK_FOREACH_SAFE(lp, next_lp, source_p->localClient->invited.head)
754 del_invite(lp->data, source_p);
755
756 del_all_accepts(source_p);
757 }
758 }
759
760 /* Remove source_p from the client lists */
761 if (HasID(source_p))
762 hash_del_id(source_p);
763 if (source_p->name[0])
764 hash_del_client(source_p);
765
766 if (IsUserHostIp(source_p))
767 delete_user_host(source_p->username, source_p->host, !MyConnect(source_p));
768
769 /* remove from global client list
770 * NOTE: source_p->node.next cannot be NULL if the client is added
771 * to global_client_list (there is always &me at its end)
772 */
773 if (source_p != NULL && source_p->node.next != NULL)
774 dlinkDelete(&source_p->node, &global_client_list);
775
776 update_client_exit_stats(source_p);
777
778 /* Check to see if the client isn't already on the dead list */
779 assert(dlinkFind(&dead_list, source_p) == NULL);
780
781 /* add to dead client dlist */
782 SetDead(source_p);
783 dlinkAdd(source_p, make_dlink_node(), &dead_list);
784 }
785
786 /* Recursively send QUITs and SQUITs for source_p and all its dependent clients
787 * and servers to those servers that need them. A server needs the client
788 * QUITs if it can't figure them out from the SQUIT (ie pre-TS4) or if it
789 * isn't getting the SQUIT because of @#(*&@)# hostmasking. With TS4, once
790 * a link gets a SQUIT, it doesn't need any QUIT/SQUITs for clients depending
791 * on that one -orabidoo
792 *
793 * This is now called on each local server -adx
794 */
795 static void
796 recurse_send_quits(struct Client *original_source_p, struct Client *source_p,
797 struct Client *from, struct Client *to, const char *comment,
798 const char *splitstr, const char *myname)
799 {
800 dlink_node *ptr, *next;
801 struct Client *target_p;
802 int hidden = match(myname, source_p->name);
803
804 assert(to != source_p); /* should be already removed from serv_list */
805
806 /* If this server can handle quit storm (QS) removal
807 * of dependents, just send the SQUIT
808 *
809 * Always check *all* dependent servers if some of them are
810 * hidden behind fakename. If so, send out the QUITs -adx
811 */
812 if (hidden || !IsCapable(to, CAP_QS))
813 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
814 {
815 target_p = ptr->data;
816 sendto_one(to, ":%s QUIT :%s", target_p->name, splitstr);
817 }
818
819 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
820 recurse_send_quits(original_source_p, ptr->data, from, to,
821 comment, splitstr, myname);
822
823 if (!hidden && ((source_p == original_source_p && to != from) ||
824 !IsCapable(to, CAP_QS)))
825 {
826 /* don't use a prefix here - we have to be 100% sure the message
827 * will be accepted without Unknown prefix etc.. */
828 sendto_one(to, "SQUIT %s :%s", ID_or_name(source_p, to), comment);
829 }
830 }
831
832 /*
833 * Remove all clients that depend on source_p; assumes all (S)QUITs have
834 * already been sent. we make sure to exit a server's dependent clients
835 * and servers before the server itself; exit_one_client takes care of
836 * actually removing things off llists. tweaked from +CSr31 -orabidoo
837 */
838 static void
839 recurse_remove_clients(struct Client *source_p, const char *quitmsg)
840 {
841 dlink_node *ptr, *next;
842
843 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
844 exit_one_client(ptr->data, quitmsg);
845
846 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
847 {
848 recurse_remove_clients(ptr->data, quitmsg);
849 exit_one_client(ptr->data, quitmsg);
850 }
851 }
852
853 /*
854 ** Remove *everything* that depends on source_p, from all lists, and sending
855 ** all necessary QUITs and SQUITs. source_p itself is still on the lists,
856 ** and its SQUITs have been sent except for the upstream one -orabidoo
857 */
858 static void
859 remove_dependents(struct Client *source_p, struct Client *from,
860 const char *comment, const char *splitstr)
861 {
862 struct Client *to;
863 struct ConfItem *conf;
864 static char myname[HOSTLEN+1];
865 dlink_node *ptr;
866
867 DLINK_FOREACH(ptr, serv_list.head)
868 {
869 to = ptr->data;
870
871 if ((conf = to->serv->sconf) != NULL)
872 strlcpy(myname, my_name_for_link(conf), sizeof(myname));
873 else
874 strlcpy(myname, me.name, sizeof(myname));
875 recurse_send_quits(source_p, source_p, from, to,
876 comment, splitstr, myname);
877 }
878
879 recurse_remove_clients(source_p, splitstr);
880 }
881
882 /*
883 * exit_client - exit a client of any type. Generally, you can use
884 * this on any struct Client, regardless of its state.
885 *
886 * Note, you shouldn't exit remote _users_ without first doing
887 * SetKilled and propagating a kill or similar message. However,
888 * it is perfectly correct to call exit_client to force a _server_
889 * quit (either local or remote one).
890 *
891 * inputs: - a client pointer that is going to be exited
892 * - for servers, the second argument is a pointer to who
893 * is firing the server. This side won't get any generated
894 * messages. NEVER NULL!
895 * output: none
896 * side effects: the client is delinked from all lists, disconnected,
897 * and the rest of IRC network is notified of the exit.
898 * Client memory is scheduled to be freed
899 */
900 void
901 exit_client(struct Client *source_p, struct Client *from, const char *comment)
902 {
903 dlink_node *m;
904
905 if (MyConnect(source_p))
906 {
907 /* DO NOT REMOVE. exit_client can be called twice after a failed
908 * read/write.
909 */
910 if (IsClosing(source_p))
911 return;
912
913 SetClosing(source_p);
914
915 if (IsIpHash(source_p))
916 remove_one_ip(&source_p->localClient->ip);
917
918 if (source_p->localClient->auth)
919 {
920 delete_auth(source_p->localClient->auth);
921 source_p->localClient->auth = NULL;
922 }
923
924 /* This source_p could have status of one of STAT_UNKNOWN, STAT_CONNECTING
925 * STAT_HANDSHAKE or STAT_UNKNOWN
926 * all of which are lumped together into unknown_list
927 *
928 * In all above cases IsRegistered() will not be true.
929 */
930 if (!IsRegistered(source_p))
931 {
932 if ((m = dlinkFindDelete(&unknown_list, source_p)) != NULL)
933 free_dlink_node(m);
934 }
935 else if (IsClient(source_p))
936 {
937 assert(Count.local > 0);
938 Count.local--;
939
940 if (IsOper(source_p))
941 {
942 if ((m = dlinkFindDelete(&oper_list, source_p)) != NULL)
943 free_dlink_node(m);
944 }
945
946 dlinkDelete(&source_p->localClient->lclient_node, &local_client_list);
947 if (source_p->localClient->list_task != NULL)
948 free_list_task(source_p->localClient->list_task, source_p);
949
950 watch_del_watch_list(source_p);
951 sendto_realops_flags(UMODE_CCONN, L_ALL, "Client exiting: %s (%s@%s) [%s] [%s]",
952 source_p->name, source_p->username, source_p->host, comment,
953 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
954 "255.255.255.255" : source_p->sockhost);
955 sendto_realops_flags(UMODE_CCONN_FULL, L_ALL, "CLIEXIT: %s %s %s %s 0 %s",
956 source_p->name,
957 source_p->username,
958 source_p->host,
959
960 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
961 "255.255.255.255" : source_p->sockhost,
962 comment);
963 }
964
965 /* As soon as a client is known to be a server of some sort
966 * it has to be put on the serv_list, or SJOIN's to this new server
967 * from the connect burst will not be seen.
968 */
969 if (IsServer(source_p) || IsConnecting(source_p) ||
970 IsHandshake(source_p))
971 {
972 if ((m = dlinkFindDelete(&serv_list, source_p)) != NULL)
973 {
974 free_dlink_node(m);
975 unset_chcap_usage_counts(source_p);
976 }
977
978 if (IsServer(source_p))
979 Count.myserver--;
980 }
981
982 log_user_exit(source_p);
983
984 if (!IsDead(source_p))
985 {
986 if (IsServer(source_p))
987 {
988 /* for them, we are exiting the network */
989 sendto_one(source_p, ":%s SQUIT %s :%s",
990 ID_or_name(from, source_p), me.name, comment);
991 }
992
993 sendto_one(source_p, "ERROR :Closing Link: %s (%s)",
994 source_p->host, comment);
995 }
996
997 /*
998 ** Currently only server connections can have
999 ** depending remote clients here, but it does no
1000 ** harm to check for all local clients. In
1001 ** future some other clients than servers might
1002 ** have remotes too...
1003 **
1004 ** Close the Client connection first and mark it
1005 ** so that no messages are attempted to send to it.
1006 ** Remember it makes source_p->from == NULL.
1007 */
1008 close_connection(source_p);
1009 }
1010
1011 if (IsServer(source_p))
1012 {
1013 char splitstr[HOSTLEN + HOSTLEN + 2];
1014
1015 /* This shouldn't ever happen */
1016 assert(source_p->serv != NULL && source_p->servptr != NULL);
1017
1018 if (ConfigServerHide.hide_servers)
1019 /*
1020 * Set netsplit message to "*.net *.split" to still show
1021 * that its a split, but hide the servers splitting
1022 */
1023 strcpy(splitstr, "*.net *.split");
1024 else
1025 snprintf(splitstr, sizeof(splitstr), "%s %s",
1026 source_p->servptr->name, source_p->name);
1027
1028 remove_dependents(source_p, from->from, comment, splitstr);
1029
1030 if (source_p->servptr == &me)
1031 {
1032 sendto_realops_flags(UMODE_ALL, L_ALL,
1033 "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1034 source_p->name, (int)(CurrentTime - source_p->firsttime),
1035 source_p->localClient->send.bytes >> 10,
1036 source_p->localClient->recv.bytes >> 10);
1037 ilog(L_NOTICE, "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1038 source_p->name, (int)(CurrentTime - source_p->firsttime),
1039 source_p->localClient->send.bytes >> 10,
1040 source_p->localClient->recv.bytes >> 10);
1041 }
1042 }
1043 else if (IsClient(source_p) && !IsKilled(source_p))
1044 {
1045 sendto_server(from->from, NULL, CAP_TS6, NOCAPS,
1046 ":%s QUIT :%s", ID(source_p), comment);
1047 sendto_server(from->from, NULL, NOCAPS, CAP_TS6,
1048 ":%s QUIT :%s", source_p->name, comment);
1049 }
1050
1051 /* The client *better* be off all of the lists */
1052 assert(dlinkFind(&unknown_list, source_p) == NULL);
1053 assert(dlinkFind(&local_client_list, source_p) == NULL);
1054 assert(dlinkFind(&serv_list, source_p) == NULL);
1055 assert(dlinkFind(&oper_list, source_p) == NULL);
1056
1057 exit_one_client(source_p, comment);
1058 }
1059
1060 /*
1061 * dead_link_on_write - report a write error if not already dead,
1062 * mark it as dead then exit it
1063 */
1064 void
1065 dead_link_on_write(struct Client *client_p, int ierrno)
1066 {
1067 dlink_node *ptr;
1068
1069 if (IsDefunct(client_p))
1070 return;
1071
1072 dbuf_clear(&client_p->localClient->buf_recvq);
1073 dbuf_clear(&client_p->localClient->buf_sendq);
1074
1075 assert(dlinkFind(&abort_list, client_p) == NULL);
1076 ptr = make_dlink_node();
1077 /* don't let exit_aborted_clients() finish yet */
1078 dlinkAddTail(client_p, ptr, &abort_list);
1079
1080 if (eac_next == NULL)
1081 eac_next = ptr;
1082
1083 SetDead(client_p); /* You are dead my friend */
1084 }
1085
1086 /*
1087 * dead_link_on_read - report a read error if not already dead,
1088 * mark it as dead then exit it
1089 */
1090 void
1091 dead_link_on_read(struct Client *client_p, int error)
1092 {
1093 char errmsg[255];
1094 int current_error;
1095
1096 if (IsDefunct(client_p))
1097 return;
1098
1099 dbuf_clear(&client_p->localClient->buf_recvq);
1100 dbuf_clear(&client_p->localClient->buf_sendq);
1101
1102 current_error = get_sockerr(client_p->localClient->fd.fd);
1103
1104 if (IsServer(client_p) || IsHandshake(client_p))
1105 {
1106 int connected = CurrentTime - client_p->firsttime;
1107
1108 if (error == 0)
1109 {
1110 /* Admins get the real IP */
1111 sendto_realops_flags(UMODE_ALL, L_ADMIN,
1112 "Server %s closed the connection",
1113 get_client_name(client_p, SHOW_IP));
1114
1115 /* Opers get a masked IP */
1116 sendto_realops_flags(UMODE_ALL, L_OPER,
1117 "Server %s closed the connection",
1118 get_client_name(client_p, MASK_IP));
1119
1120 ilog(L_NOTICE, "Server %s closed the connection",
1121 get_client_name(client_p, SHOW_IP));
1122 }
1123 else
1124 {
1125 report_error(L_ADMIN, "Lost connection to %s: %s",
1126 get_client_name(client_p, SHOW_IP), current_error);
1127 report_error(L_OPER, "Lost connection to %s: %s",
1128 get_client_name(client_p, MASK_IP), current_error);
1129 }
1130
1131 sendto_realops_flags(UMODE_ALL, L_ALL,
1132 "%s had been connected for %d day%s, %2d:%02d:%02d",
1133 client_p->name, connected/86400,
1134 (connected/86400 == 1) ? "" : "s",
1135 (connected % 86400) / 3600, (connected % 3600) / 60,
1136 connected % 60);
1137 }
1138
1139 if (error == 0)
1140 strlcpy(errmsg, "Remote host closed the connection",
1141 sizeof(errmsg));
1142 else
1143 ircsprintf(errmsg, "Read error: %s",
1144 strerror(current_error));
1145
1146 exit_client(client_p, &me, errmsg);
1147 }
1148
1149 void
1150 exit_aborted_clients(void)
1151 {
1152 dlink_node *ptr;
1153 struct Client *target_p;
1154 const char *notice;
1155
1156 DLINK_FOREACH_SAFE(ptr, eac_next, abort_list.head)
1157 {
1158 target_p = ptr->data;
1159 eac_next = ptr->next;
1160
1161 if (target_p == NULL)
1162 {
1163 sendto_realops_flags(UMODE_ALL, L_ALL,
1164 "Warning: null client on abort_list!");
1165 dlinkDelete(ptr, &abort_list);
1166 free_dlink_node(ptr);
1167 continue;
1168 }
1169
1170 dlinkDelete(ptr, &abort_list);
1171
1172 if (IsSendQExceeded(target_p))
1173 notice = "Max SendQ exceeded";
1174 else
1175 notice = "Write error: connection closed";
1176
1177 exit_client(target_p, &me, notice);
1178 free_dlink_node(ptr);
1179 }
1180 }
1181
1182 /*
1183 * accept processing, this adds a form of "caller ID" to ircd
1184 *
1185 * If a client puts themselves into "caller ID only" mode,
1186 * only clients that match a client pointer they have put on
1187 * the accept list will be allowed to message them.
1188 *
1189 * Diane Bruce, "Dianora" db@db.net
1190 */
1191
1192 void
1193 del_accept(struct split_nuh_item *accept_p, struct Client *client_p)
1194 {
1195 dlinkDelete(&accept_p->node, &client_p->localClient->acceptlist);
1196
1197 MyFree(accept_p->nickptr);
1198 MyFree(accept_p->userptr);
1199 MyFree(accept_p->hostptr);
1200 MyFree(accept_p);
1201 }
1202
1203 struct split_nuh_item *
1204 find_accept(const char *nick, const char *user,
1205 const char *host, struct Client *client_p, int do_match)
1206 {
1207 dlink_node *ptr = NULL;
1208 /* XXX We wouldn't need that if match() would return 0 on match */
1209 int (*cmpfunc)(const char *, const char *) = do_match ? match : irccmp;
1210
1211 DLINK_FOREACH(ptr, client_p->localClient->acceptlist.head)
1212 {
1213 struct split_nuh_item *accept_p = ptr->data;
1214
1215 if (cmpfunc(accept_p->nickptr, nick) == do_match &&
1216 cmpfunc(accept_p->userptr, user) == do_match &&
1217 cmpfunc(accept_p->hostptr, host) == do_match)
1218 return accept_p;
1219 }
1220
1221 return NULL;
1222 }
1223
1224 /* accept_message()
1225 *
1226 * inputs - pointer to source client
1227 * - pointer to target client
1228 * output - 1 if accept this message 0 if not
1229 * side effects - See if source is on target's allow list
1230 */
1231 int
1232 accept_message(struct Client *source,
1233 struct Client *target)
1234 {
1235 dlink_node *ptr = NULL;
1236
1237 if (source == target || find_accept(source->name, source->username,
1238 source->host, target, 1))
1239 return 1;
1240
1241 if (IsSoftCallerId(target))
1242 DLINK_FOREACH(ptr, target->channel.head)
1243 if (IsMember(source, ((struct Membership *)ptr->data)->chptr))
1244 return 1;
1245
1246 return 0;
1247 }
1248
1249 /* del_all_accepts()
1250 *
1251 * inputs - pointer to exiting client
1252 * output - NONE
1253 * side effects - Walk through given clients acceptlist and remove all entries
1254 */
1255 void
1256 del_all_accepts(struct Client *client_p)
1257 {
1258 dlink_node *ptr = NULL, *next_ptr = NULL;
1259
1260 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->localClient->acceptlist.head)
1261 del_accept(ptr->data, client_p);
1262 }
1263
1264 /* change_local_nick()
1265 *
1266 * inputs - pointer to server
1267 * - pointer to client
1268 * - nick
1269 * output -
1270 * side effects - changes nick of a LOCAL user
1271 */
1272 void
1273 change_local_nick(struct Client *client_p, struct Client *source_p, const char *nick)
1274 {
1275 int samenick = 0;
1276
1277 assert(source_p->name[0] && !EmptyString(nick));
1278
1279 /*
1280 * Client just changing his/her nick. If he/she is
1281 * on a channel, send note of change to all clients
1282 * on that channel. Propagate notice to other servers.
1283 */
1284 if ((source_p->localClient->last_nick_change +
1285 ConfigFileEntry.max_nick_time) < CurrentTime)
1286 source_p->localClient->number_of_nick_changes = 0;
1287 source_p->localClient->last_nick_change = CurrentTime;
1288 source_p->localClient->number_of_nick_changes++;
1289
1290 if ((ConfigFileEntry.anti_nick_flood &&
1291 (source_p->localClient->number_of_nick_changes
1292 <= ConfigFileEntry.max_nick_changes)) ||
1293 !ConfigFileEntry.anti_nick_flood ||
1294 (IsOper(source_p) && ConfigFileEntry.no_oper_flood))
1295 {
1296 samenick = !irccmp(source_p->name, nick);
1297
1298 if (!samenick)
1299 {
1300 source_p->tsinfo = CurrentTime;
1301 clear_ban_cache_client(source_p);
1302 watch_check_hash(source_p, RPL_LOGOFF);
1303 }
1304
1305 /* XXX - the format of this notice should eventually be changed
1306 * to either %s[%s@%s], or even better would be get_client_name() -bill
1307 */
1308 sendto_realops_flags(UMODE_NCHANGE, L_ALL, "Nick change: From %s to %s [%s@%s]",
1309 source_p->name, nick, source_p->username, source_p->host);
1310 sendto_common_channels_local(source_p, 1, ":%s!%s@%s NICK :%s",
1311 source_p->name, source_p->username,
1312 source_p->host, nick);
1313 add_history(source_p, 1);
1314
1315 sendto_server(client_p, NULL, CAP_TS6, NOCAPS,
1316 ":%s NICK %s :%lu",
1317 ID(source_p), nick, (unsigned long)source_p->tsinfo);
1318 sendto_server(client_p, NULL, NOCAPS, CAP_TS6,
1319 ":%s NICK %s :%lu",
1320 source_p->name, nick, (unsigned long)source_p->tsinfo);
1321
1322 hash_del_client(source_p);
1323 strcpy(source_p->name, nick);
1324 hash_add_client(source_p);
1325
1326 if (!samenick)
1327 watch_check_hash(source_p, RPL_LOGON);
1328
1329 /* fd_desc is long enough */
1330 fd_note(&client_p->localClient->fd, "Nick: %s", nick);
1331 }
1332 else
1333 sendto_one(source_p, form_str(ERR_NICKTOOFAST),
1334 me.name, source_p->name, source_p->name,
1335 nick, ConfigFileEntry.max_nick_time);
1336 }

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