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root/svn/ircd-hybrid/src/client.c
Revision: 32
Committed: Sun Oct 2 20:41:23 2005 UTC (18 years, 5 months ago) by knight
Content type: text/x-csrc
File size: 42168 byte(s)
Log Message:
- svn:keywords

File Contents

# Content
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 "tools.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 "list.h"
37 #include "s_gline.h"
38 #include "numeric.h"
39 #include "packet.h"
40 #include "s_auth.h"
41 #include "s_bsd.h"
42 #include "s_conf.h"
43 #include "s_log.h"
44 #include "s_misc.h"
45 #include "s_serv.h"
46 #include "send.h"
47 #include "whowas.h"
48 #include "s_user.h"
49 #include "dbuf.h"
50 #include "memory.h"
51 #include "hostmask.h"
52 #include "balloc.h"
53 #include "listener.h"
54 #include "irc_res.h"
55 #include "userhost.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 /* as good a place as any... */
126 dlinkAdd(client_p, make_dlink_node(), &unknown_list);
127 }
128 else
129 client_p->from = from; /* 'from' of local client is self! */
130
131 client_p->hnext = client_p;
132 client_p->status = STAT_UNKNOWN;
133 strcpy(client_p->username, "unknown");
134
135 return client_p;
136 }
137
138 /*
139 * free_client
140 *
141 * inputs - pointer to client
142 * output - NONE
143 * side effects - client pointed to has its memory freed
144 */
145 static void
146 free_client(struct Client *client_p)
147 {
148 assert(client_p != NULL);
149 assert(client_p != &me);
150 assert(client_p->hnext == client_p);
151 assert(client_p->invited.head == NULL);
152 assert(client_p->channel.head == NULL);
153 assert(dlink_list_length(&client_p->invited) == 0);
154 assert(dlink_list_length(&client_p->channel) == 0);
155
156 MyFree(client_p->away);
157 MyFree(client_p->serv);
158
159 if (MyConnect(client_p))
160 {
161 assert(IsClosing(client_p) && IsDead(client_p));
162
163 MyFree(client_p->localClient->response);
164 MyFree(client_p->localClient->auth_oper);
165
166 /*
167 * clean up extra sockets from P-lines which have been discarded.
168 */
169 if (client_p->localClient->listener)
170 {
171 assert(0 < client_p->localClient->listener->ref_count);
172 if (0 == --client_p->localClient->listener->ref_count &&
173 !client_p->localClient->listener->active)
174 free_listener(client_p->localClient->listener);
175 }
176
177 dbuf_clear(&client_p->localClient->buf_recvq);
178 dbuf_clear(&client_p->localClient->buf_sendq);
179
180 BlockHeapFree(lclient_heap, client_p->localClient);
181 }
182
183 BlockHeapFree(client_heap, client_p);
184 }
185
186 /*
187 * check_pings - go through the local client list and check activity
188 * kill off stuff that should die
189 *
190 * inputs - NOT USED (from event)
191 * output - next time_t when check_pings() should be called again
192 * side effects -
193 *
194 *
195 * A PING can be sent to clients as necessary.
196 *
197 * Client/Server ping outs are handled.
198 */
199
200 /*
201 * Addon from adrian. We used to call this after nextping seconds,
202 * however I've changed it to run once a second. This is only for
203 * PING timeouts, not K/etc-line checks (thanks dianora!). Having it
204 * run once a second makes life a lot easier - when a new client connects
205 * and they need a ping in 4 seconds, if nextping was set to 20 seconds
206 * we end up waiting 20 seconds. This is stupid. :-)
207 * I will optimise (hah!) check_pings() once I've finished working on
208 * tidying up other network IO evilnesses.
209 * -- adrian
210 */
211
212 static void
213 check_pings(void *notused)
214 {
215 check_pings_list(&local_client_list);
216 check_pings_list(&serv_list);
217 check_unknowns_list();
218 }
219
220 /* check_pings_list()
221 *
222 * inputs - pointer to list to check
223 * output - NONE
224 * side effects -
225 */
226 static void
227 check_pings_list(dlink_list *list)
228 {
229 char scratch[32]; /* way too generous but... */
230 struct Client *client_p; /* current local client_p being examined */
231 int ping, pingwarn; /* ping time value from client */
232 dlink_node *ptr, *next_ptr;
233
234 DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
235 {
236 client_p = ptr->data;
237
238 /*
239 ** Note: No need to notify opers here. It's
240 ** already done when "FLAGS_DEADSOCKET" is set.
241 */
242 if (IsDead(client_p))
243 {
244 /* Ignore it, its been exited already */
245 continue;
246 }
247
248 if (client_p->localClient->reject_delay > 0)
249 {
250 if (client_p->localClient->reject_delay <= CurrentTime)
251 exit_client(client_p, &me, "Rejected");
252 continue;
253 }
254
255 if (GlobalSetOptions.idletime && IsClient(client_p))
256 {
257 if (!IsExemptKline(client_p) && !IsOper(client_p) &&
258 !IsIdlelined(client_p) &&
259 ((CurrentTime - client_p->localClient->last) > GlobalSetOptions.idletime))
260 {
261 struct ConfItem *conf;
262 struct AccessItem *aconf;
263
264 conf = make_conf_item(KLINE_TYPE);
265 aconf = (struct AccessItem *)map_to_conf(conf);
266
267 DupString(aconf->host, client_p->host);
268 DupString(aconf->reason, "idle exceeder");
269 DupString(aconf->user, client_p->username);
270 aconf->hold = CurrentTime + 60;
271 add_temp_line(conf);
272
273 sendto_realops_flags(UMODE_ALL, L_ALL,
274 "Idle time limit exceeded for %s - temp k-lining",
275 get_client_name(client_p, HIDE_IP));
276 exit_client(client_p, &me, aconf->reason);
277 continue;
278 }
279 }
280
281 if (!IsRegistered(client_p))
282 ping = CONNECTTIMEOUT, pingwarn = 0;
283 else
284 ping = get_client_ping(client_p, &pingwarn);
285
286 if (ping < CurrentTime - client_p->lasttime)
287 {
288 if (!IsPingSent(client_p))
289 {
290 /*
291 * if we havent PINGed the connection and we havent
292 * heard from it in a while, PING it to make sure
293 * it is still alive.
294 */
295 SetPingSent(client_p);
296 ClearPingWarning(client_p);
297 client_p->lasttime = CurrentTime - ping;
298 sendto_one(client_p, "PING :%s", ID_or_name(&me, client_p));
299 }
300 else
301 {
302 if (CurrentTime - client_p->lasttime >= 2 * ping)
303 {
304 /*
305 * If the client/server hasn't talked to us in 2*ping seconds
306 * and it has a ping time, then close its connection.
307 */
308 if (IsServer(client_p) || IsHandshake(client_p))
309 {
310 sendto_realops_flags(UMODE_ALL, L_ADMIN,
311 "No response from %s, closing link",
312 get_client_name(client_p, HIDE_IP));
313 sendto_realops_flags(UMODE_ALL, L_OPER,
314 "No response from %s, closing link",
315 get_client_name(client_p, MASK_IP));
316 ilog(L_NOTICE, "No response from %s, closing link",
317 get_client_name(client_p, HIDE_IP));
318 }
319 ircsprintf(scratch, "Ping timeout: %d seconds",
320 (int)(CurrentTime - client_p->lasttime));
321
322 exit_client(client_p, &me, scratch);
323 }
324 else if (!IsPingWarning(client_p) && pingwarn > 0 &&
325 (IsServer(client_p) || IsHandshake(client_p)) &&
326 CurrentTime - client_p->lasttime >= ping + pingwarn)
327 {
328 /*
329 * If the server hasn't replied in pingwarn seconds after sending
330 * the PING, notify the opers so that they are aware of the problem.
331 */
332 SetPingWarning(client_p);
333 sendto_realops_flags(UMODE_ALL, L_ADMIN,
334 "Warning, no response from %s in %d seconds",
335 get_client_name(client_p, HIDE_IP), pingwarn);
336 sendto_realops_flags(UMODE_ALL, L_OPER,
337 "Warning, no response from %s in %d seconds",
338 get_client_name(client_p, MASK_IP), pingwarn);
339 ilog(L_NOTICE, "No response from %s in %d seconds",
340 get_client_name(client_p, HIDE_IP), pingwarn);
341 }
342 }
343 }
344 }
345 }
346
347 /* check_unknowns_list()
348 *
349 * inputs - pointer to list of unknown clients
350 * output - NONE
351 * side effects - unknown clients get marked for termination after n seconds
352 */
353 static void
354 check_unknowns_list(void)
355 {
356 dlink_node *ptr, *next_ptr;
357
358 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
359 {
360 struct Client *client_p = ptr->data;
361
362 if (client_p->localClient->reject_delay > 0)
363 {
364 if (client_p->localClient->reject_delay <= CurrentTime)
365 exit_client(client_p, &me, "Rejected");
366 continue;
367 }
368
369 /* Check UNKNOWN connections - if they have been in this state
370 * for > 30s, close them.
371 */
372 if (client_p->firsttime ? ((CurrentTime - client_p->firsttime) > 30) : 0)
373 exit_client(client_p, &me, "Connection timed out");
374 }
375 }
376
377 /* check_conf_klines()
378 *
379 * inputs - NONE
380 * output - NONE
381 * side effects - Check all connections for a pending kline against the
382 * client, exit the client if a kline matches.
383 */
384 void
385 check_conf_klines(void)
386 {
387 struct Client *client_p = NULL; /* current local client_p being examined */
388 struct AccessItem *aconf = NULL;
389 struct ConfItem *conf = NULL;
390 dlink_node *ptr, *next_ptr;
391
392 DLINK_FOREACH_SAFE(ptr, next_ptr, local_client_list.head)
393 {
394 client_p = ptr->data;
395
396 /* If a client is already being exited
397 */
398 if (IsDead(client_p) || !IsClient(client_p))
399 continue;
400
401 /* if there is a returned struct ConfItem then kill it */
402 if ((aconf = find_dline_conf(&client_p->localClient->ip,
403 client_p->localClient->aftype)) != NULL)
404 {
405 if (aconf->status & CONF_EXEMPTDLINE)
406 continue;
407
408 conf = unmap_conf_item(aconf);
409 ban_them(client_p, conf);
410 continue; /* and go examine next fd/client_p */
411 }
412
413 if (ConfigFileEntry.glines && (aconf = find_gline(client_p)))
414 {
415 if (IsExemptKline(client_p) ||
416 IsExemptGline(client_p))
417 {
418 sendto_realops_flags(UMODE_ALL, L_ALL,
419 "GLINE over-ruled for %s, client is %sline_exempt",
420 get_client_name(client_p, HIDE_IP), IsExemptKline(client_p) ? "k" : "g");
421 continue;
422 }
423
424 conf = unmap_conf_item(aconf);
425 ban_them(client_p, conf);
426 /* and go examine next fd/client_p */
427 continue;
428 }
429
430 if ((aconf = find_kill(client_p)) != NULL)
431 {
432
433 /* if there is a returned struct AccessItem.. then kill it */
434 if (IsExemptKline(client_p))
435 {
436 sendto_realops_flags(UMODE_ALL, L_ALL,
437 "KLINE over-ruled for %s, client is kline_exempt",
438 get_client_name(client_p, HIDE_IP));
439 continue;
440 }
441
442 conf = unmap_conf_item(aconf);
443 ban_them(client_p, conf);
444 continue;
445 }
446
447 /* if there is a returned struct MatchItem then kill it */
448 if ((conf = find_matching_name_conf(XLINE_TYPE, client_p->info,
449 NULL, NULL, 0)) != NULL ||
450 (conf = find_matching_name_conf(RXLINE_TYPE, client_p->info,
451 NULL, NULL, 0)) != NULL)
452 {
453 ban_them(client_p, conf);
454 continue;
455 }
456 }
457
458 /* also check the unknowns list for new dlines */
459 DLINK_FOREACH_SAFE(ptr, next_ptr, unknown_list.head)
460 {
461 client_p = ptr->data;
462
463 if ((aconf = find_dline_conf(&client_p->localClient->ip,
464 client_p->localClient->aftype)))
465 {
466 if (aconf->status & CONF_EXEMPTDLINE)
467 continue;
468
469 exit_client(client_p, &me, "D-lined");
470 }
471 }
472 }
473
474 /*
475 * ban_them
476 *
477 * inputs - pointer to client to ban
478 * - pointer to ConfItem
479 * output - NONE
480 * side effects - given client_p is banned
481 */
482 static void
483 ban_them(struct Client *client_p, struct ConfItem *conf)
484 {
485 const char *user_reason = NULL; /* What is sent to user */
486 const char *channel_reason = NULL; /* What is sent to channel */
487 struct AccessItem *aconf = NULL;
488 struct MatchItem *xconf = NULL;
489 const char *type_string = NULL;
490 const char dline_string[] = "D-line";
491 const char kline_string[] = "K-line";
492 const char gline_string[] = "G-line";
493 const char xline_string[] = "X-line";
494
495 switch (conf->type)
496 {
497 case RKLINE_TYPE:
498 case KLINE_TYPE:
499 type_string = kline_string;
500 aconf = map_to_conf(conf);
501 break;
502 case DLINE_TYPE:
503 type_string = dline_string;
504 aconf = map_to_conf(conf);
505 break;
506 case GLINE_TYPE:
507 type_string = gline_string;
508 aconf = map_to_conf(conf);
509 break;
510 case RXLINE_TYPE:
511 case XLINE_TYPE:
512 type_string = xline_string;
513 xconf = map_to_conf(conf);
514 ++xconf->count;
515 break;
516 default:
517 assert(0);
518 break;
519 }
520
521 if (ConfigFileEntry.kline_with_reason)
522 {
523 if (aconf != NULL)
524 user_reason = aconf->reason ? aconf->reason : type_string;
525 if (xconf != NULL)
526 user_reason = xconf->reason ? xconf->reason : type_string;
527 }
528 else
529 user_reason = type_string;
530
531 if (ConfigFileEntry.kline_reason != NULL)
532 channel_reason = ConfigFileEntry.kline_reason;
533 else
534 channel_reason = user_reason;
535
536 sendto_realops_flags(UMODE_ALL, L_ALL, "%s active for %s",
537 type_string, get_client_name(client_p, HIDE_IP));
538
539 if (IsClient(client_p))
540 sendto_one(client_p, form_str(ERR_YOUREBANNEDCREEP),
541 me.name, client_p->name, user_reason);
542
543 exit_client(client_p, &me, channel_reason);
544 }
545
546 /* update_client_exit_stats()
547 *
548 * input - pointer to client
549 * output - NONE
550 * side effects -
551 */
552 static void
553 update_client_exit_stats(struct Client *client_p)
554 {
555 if (IsServer(client_p))
556 {
557 sendto_realops_flags(UMODE_EXTERNAL, L_ALL,
558 "Server %s split from %s",
559 client_p->name, client_p->servptr->name);
560 }
561 else if (IsClient(client_p))
562 {
563 --Count.total;
564 if (IsOper(client_p))
565 --Count.oper;
566 if (IsInvisible(client_p))
567 --Count.invisi;
568 }
569
570 if (splitchecking && !splitmode)
571 check_splitmode(NULL);
572 }
573
574 /* find_person()
575 *
576 * inputs - pointer to name
577 * output - return client pointer
578 * side effects - find person by (nick)name
579 */
580 /* XXX - ugly wrapper */
581 struct Client *
582 find_person(const struct Client *client_p, const char *name)
583 {
584 struct Client *c2ptr;
585
586 if (IsDigit(*name))
587 {
588 if ((c2ptr = hash_find_id(name)) != NULL)
589 {
590 /* invisible users shall not be found by UID guessing */
591 if (IsInvisible(c2ptr) && !IsServer(client_p))
592 c2ptr = NULL;
593 }
594 }
595 else
596 c2ptr = find_client(name);
597
598 return ((c2ptr != NULL && IsClient(c2ptr)) ? c2ptr : NULL);
599 }
600
601 /*
602 * find_chasing - find the client structure for a nick name (user)
603 * using history mechanism if necessary. If the client is not found,
604 * an error message (NO SUCH NICK) is generated. If the client was found
605 * through the history, chasing will be 1 and otherwise 0.
606 */
607 struct Client *
608 find_chasing(struct Client *client_p, struct Client *source_p, const char *user, int *chasing)
609 {
610 struct Client *who = find_person(client_p, user);
611
612 if (chasing)
613 *chasing = 0;
614
615 if (who)
616 return(who);
617
618 if (IsDigit(*user))
619 return(NULL);
620
621 if ((who = get_history(user,
622 (time_t)ConfigFileEntry.kill_chase_time_limit))
623 == NULL)
624 {
625 sendto_one(source_p, form_str(ERR_NOSUCHNICK),
626 me.name, source_p->name, user);
627 return(NULL);
628 }
629
630 if (chasing)
631 *chasing = 1;
632
633 return(who);
634 }
635
636 /*
637 * get_client_name - Return the name of the client
638 * for various tracking and
639 * admin purposes. The main purpose of this function is to
640 * return the "socket host" name of the client, if that
641 * differs from the advertised name (other than case).
642 * But, this can be used to any client structure.
643 *
644 * NOTE 1:
645 * Watch out the allocation of "nbuf", if either source_p->name
646 * or source_p->sockhost gets changed into pointers instead of
647 * directly allocated within the structure...
648 *
649 * NOTE 2:
650 * Function return either a pointer to the structure (source_p) or
651 * to internal buffer (nbuf). *NEVER* use the returned pointer
652 * to modify what it points!!!
653 */
654 const char *
655 get_client_name(struct Client *client, int showip)
656 {
657 static char nbuf[HOSTLEN * 2 + USERLEN + 5];
658
659 assert(client != NULL);
660
661 if (irccmp(client->name, client->host) == 0)
662 return(client->name);
663
664 if (ConfigServerHide.hide_server_ips)
665 if (IsServer(client) || IsConnecting(client) || IsHandshake(client))
666 showip = MASK_IP;
667
668 if (ConfigFileEntry.hide_spoof_ips)
669 if (showip == SHOW_IP && IsIPSpoof(client))
670 showip = MASK_IP;
671
672 /* And finally, let's get the host information, ip or name */
673 switch (showip)
674 {
675 case SHOW_IP:
676 if (MyConnect(client))
677 {
678 ircsprintf(nbuf, "%s[%s@%s]", client->name, client->username,
679 client->sockhost);
680 break;
681 }
682 case MASK_IP:
683 ircsprintf(nbuf, "%s[%s@255.255.255.255]", client->name,
684 client->username);
685 break;
686 default:
687 ircsprintf(nbuf, "%s[%s@%s]", client->name, client->username,
688 client->host);
689 }
690
691 return(nbuf);
692 }
693
694 void
695 free_exited_clients(void)
696 {
697 dlink_node *ptr, *next;
698 struct Client *target_p;
699
700 DLINK_FOREACH_SAFE(ptr, next, dead_list.head)
701 {
702 target_p = ptr->data;
703
704 if (ptr->data == NULL)
705 {
706 sendto_realops_flags(UMODE_ALL, L_ALL,
707 "Warning: null client on dead_list!");
708 dlinkDelete(ptr, &dead_list);
709 free_dlink_node(ptr);
710 continue;
711 }
712
713 free_client(target_p);
714 dlinkDelete(ptr, &dead_list);
715 free_dlink_node(ptr);
716 }
717 }
718
719 /*
720 * Exit one client, local or remote. Assuming all dependents have
721 * been already removed, and socket closed for local client.
722 *
723 * The only messages generated are QUITs on channels.
724 */
725 static void
726 exit_one_client(struct Client *source_p, const char *quitmsg)
727 {
728 dlink_node *lp = NULL, *next_lp = NULL;
729
730 assert(!IsMe(source_p));
731
732 if (IsServer(source_p))
733 {
734 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->servers);
735
736 if ((lp = dlinkFindDelete(&global_serv_list, source_p)) != NULL)
737 free_dlink_node(lp);
738
739 if (!MyConnect(source_p))
740 {
741 source_p->from->serv->dep_servers--;
742 assert(source_p->from->serv->dep_servers > 0);
743 }
744 }
745 else if (IsClient(source_p))
746 {
747 if (source_p->servptr->serv != NULL)
748 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->users);
749
750 /* If a person is on a channel, send a QUIT notice
751 ** to every client (person) on the same channel (so
752 ** that the client can show the "**signoff" message).
753 ** (Note: The notice is to the local clients *only*)
754 */
755 sendto_common_channels_local(source_p, 0, ":%s!%s@%s QUIT :%s",
756 source_p->name, source_p->username,
757 source_p->host, quitmsg);
758 DLINK_FOREACH_SAFE(lp, next_lp, source_p->channel.head)
759 remove_user_from_channel(lp->data);
760
761 /* Clean up invitefield */
762 DLINK_FOREACH_SAFE(lp, next_lp, source_p->invited.head)
763 del_invite(lp->data, source_p);
764
765 /* Clean up allow lists */
766 del_all_accepts(source_p);
767 add_history(source_p, 0);
768 off_history(source_p);
769
770 if (!MyConnect(source_p))
771 {
772 source_p->from->serv->dep_users--;
773 assert(source_p->from->serv->dep_users >= 0);
774 }
775 }
776
777 /* Remove source_p from the client lists */
778 if (HasID(source_p))
779 hash_del_id(source_p);
780 if (source_p->name[0])
781 hash_del_client(source_p);
782
783 if (IsUserHostIp(source_p))
784 delete_user_host(source_p->username, source_p->host, !MyConnect(source_p));
785
786 /* remove from global client list
787 * NOTE: source_p->node.next cannot be NULL if the client is added
788 * to global_client_list (there is always &me at its end)
789 */
790 if (source_p != NULL && source_p->node.next != NULL)
791 dlinkDelete(&source_p->node, &global_client_list);
792
793 update_client_exit_stats(source_p);
794
795 /* Check to see if the client isn't already on the dead list */
796 assert(dlinkFind(&dead_list, source_p) == NULL);
797
798 /* add to dead client dlist */
799 SetDead(source_p);
800 dlinkAdd(source_p, make_dlink_node(), &dead_list);
801 }
802
803 /* Recursively send QUITs and SQUITs for source_p and all its dependent clients
804 * and servers to those servers that need them. A server needs the client
805 * QUITs if it can't figure them out from the SQUIT (ie pre-TS4) or if it
806 * isn't getting the SQUIT because of @#(*&@)# hostmasking. With TS4, once
807 * a link gets a SQUIT, it doesn't need any QUIT/SQUITs for clients depending
808 * on that one -orabidoo
809 *
810 * This is now called on each local server -adx
811 */
812 static void
813 recurse_send_quits(struct Client *original_source_p, struct Client *source_p,
814 struct Client *from, struct Client *to, const char *comment,
815 const char *splitstr, const char *myname)
816 {
817 dlink_node *ptr, *next;
818 struct Client *target_p;
819 int hidden = match(myname, source_p->name);
820
821 assert(to != source_p); /* should be already removed from serv_list */
822
823 /* If this server can handle quit storm (QS) removal
824 * of dependents, just send the SQUIT
825 *
826 * Always check *all* dependent servers if some of them are
827 * hidden behind fakename. If so, send out the QUITs -adx
828 */
829 if (hidden || !IsCapable(to, CAP_QS))
830 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->users.head)
831 {
832 target_p = ptr->data;
833 sendto_one(to, ":%s QUIT :%s", target_p->name, splitstr);
834 }
835
836 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->servers.head)
837 recurse_send_quits(original_source_p, ptr->data, from, to,
838 comment, splitstr, myname);
839
840 if (!hidden && ((source_p == original_source_p && to != from) ||
841 !IsCapable(to, CAP_QS)))
842 {
843 /* don't use a prefix here - we have to be 100% sure the message
844 * will be accepted without Unknown prefix etc.. */
845 sendto_one(to, "SQUIT %s :%s", ID_or_name(source_p, to), comment);
846 }
847 }
848
849 /*
850 * Remove all clients that depend on source_p; assumes all (S)QUITs have
851 * already been sent. we make sure to exit a server's dependent clients
852 * and servers before the server itself; exit_one_client takes care of
853 * actually removing things off llists. tweaked from +CSr31 -orabidoo
854 */
855 static void
856 recurse_remove_clients(struct Client *source_p, const char *quitmsg)
857 {
858 dlink_node *ptr, *next;
859
860 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->users.head)
861 exit_one_client(ptr->data, quitmsg);
862
863 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->servers.head)
864 {
865 recurse_remove_clients(ptr->data, quitmsg);
866 exit_one_client(ptr->data, quitmsg);
867 }
868
869 assert(source_p->serv->dep_servers == 1);
870 assert(source_p->serv->dep_users == 0);
871 }
872
873 /*
874 ** Remove *everything* that depends on source_p, from all lists, and sending
875 ** all necessary QUITs and SQUITs. source_p itself is still on the lists,
876 ** and its SQUITs have been sent except for the upstream one -orabidoo
877 */
878 static void
879 remove_dependents(struct Client *source_p, struct Client *from,
880 const char *comment, const char *splitstr)
881 {
882 struct Client *to;
883 struct ConfItem *conf;
884 static char myname[HOSTLEN+1];
885 dlink_node *ptr;
886
887 DLINK_FOREACH(ptr, serv_list.head)
888 {
889 to = ptr->data;
890
891 if ((conf = to->serv->sconf) != NULL)
892 strlcpy(myname, my_name_for_link(conf), sizeof(myname));
893 else
894 strlcpy(myname, me.name, sizeof(myname));
895 recurse_send_quits(source_p, source_p, from, to,
896 comment, splitstr, myname);
897 }
898
899 recurse_remove_clients(source_p, splitstr);
900 }
901
902 /*
903 * exit_client - exit a client of any type. Generally, you can use
904 * this on any struct Client, regardless of its state.
905 *
906 * Note, you shouldn't exit remote _users_ without first doing
907 * SetKilled and propagating a kill or similar message. However,
908 * it is perfectly correct to call exit_client to force a _server_
909 * quit (either local or remote one).
910 *
911 * inputs: - a client pointer that is going to be exited
912 * - for servers, the second argument is a pointer to who
913 * is firing the server. This side won't get any generated
914 * messages. NEVER NULL!
915 * output: none
916 * side effects: the client is delinked from all lists, disconnected,
917 * and the rest of IRC network is notified of the exit.
918 * Client memory is scheduled to be freed
919 */
920 void
921 exit_client(struct Client *source_p, struct Client *from, const char *comment)
922 {
923 dlink_node *m;
924
925 if (MyConnect(source_p))
926 {
927 /* DO NOT REMOVE. exit_client can be called twice after a failed
928 * read/write.
929 */
930 if (IsClosing(source_p))
931 return;
932
933 SetClosing(source_p);
934
935 if (IsIpHash(source_p))
936 remove_one_ip(&source_p->localClient->ip);
937
938 delete_auth(source_p);
939
940 /* This source_p could have status of one of STAT_UNKNOWN, STAT_CONNECTING
941 * STAT_HANDSHAKE or STAT_UNKNOWN
942 * all of which are lumped together into unknown_list
943 *
944 * In all above cases IsRegistered() will not be true.
945 */
946 if (!IsRegistered(source_p))
947 {
948 if ((m = dlinkFindDelete(&unknown_list, source_p)) != NULL)
949 free_dlink_node(m);
950 }
951 else if (IsClient(source_p))
952 {
953 Count.local--;
954
955 if (IsOper(source_p))
956 {
957 if ((m = dlinkFindDelete(&oper_list, source_p)) != NULL)
958 free_dlink_node(m);
959 }
960
961 dlinkDelete(&source_p->localClient->lclient_node, &local_client_list);
962 if (source_p->localClient->list_task != NULL)
963 free_list_task(source_p->localClient->list_task, source_p);
964
965 sendto_realops_flags(UMODE_CCONN, L_ALL, "Client exiting: %s (%s@%s) [%s] [%s]",
966 source_p->name, source_p->username, source_p->host, comment,
967 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
968 "255.255.255.255" : source_p->sockhost);
969 }
970
971 /* As soon as a client is known to be a server of some sort
972 * it has to be put on the serv_list, or SJOIN's to this new server
973 * from the connect burst will not be seen.
974 */
975 if (IsServer(source_p) || IsConnecting(source_p) ||
976 IsHandshake(source_p))
977 {
978 if ((m = dlinkFindDelete(&serv_list, source_p)) != NULL)
979 {
980 free_dlink_node(m);
981 unset_chcap_usage_counts(source_p);
982 }
983
984 if (IsServer(source_p))
985 {
986 Count.myserver--;
987 if (ServerInfo.hub)
988 remove_lazylink_flags(source_p->localClient->serverMask);
989 else
990 uplink = NULL;
991 }
992 }
993
994 log_user_exit(source_p);
995
996 if (!IsDead(source_p))
997 {
998 if (IsServer(source_p))
999 {
1000 /* for them, we are exiting the network */
1001 sendto_one(source_p, ":%s SQUIT %s :%s",
1002 ID_or_name(from, source_p), me.name, comment);
1003 }
1004
1005 sendto_one(source_p, "ERROR :Closing Link: %s (%s)",
1006 source_p->host, comment);
1007 }
1008
1009 /*
1010 ** Currently only server connections can have
1011 ** depending remote clients here, but it does no
1012 ** harm to check for all local clients. In
1013 ** future some other clients than servers might
1014 ** have remotes too...
1015 **
1016 ** Close the Client connection first and mark it
1017 ** so that no messages are attempted to send to it.
1018 ** Remember it makes source_p->from == NULL.
1019 */
1020 close_connection(source_p);
1021 }
1022
1023 if (IsServer(source_p))
1024 {
1025 char splitstr[HOSTLEN + HOSTLEN + 2];
1026
1027 /* This shouldn't ever happen */
1028 assert(source_p->serv != NULL && source_p->servptr != NULL);
1029
1030 if (ConfigServerHide.hide_servers)
1031 /* set netsplit message to "*.net *.split" to still show
1032 * that its a split, but hide the servers splitting
1033 */
1034 strcpy(splitstr, "*.net *.split");
1035 else
1036 snprintf(splitstr, sizeof(splitstr), "%s %s",
1037 source_p->servptr->name, source_p->name);
1038
1039 remove_dependents(source_p, from->from, comment, splitstr);
1040
1041 if (source_p->servptr == &me)
1042 {
1043 sendto_realops_flags(UMODE_ALL, L_ALL,
1044 "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1045 source_p->name, (int)(CurrentTime - source_p->firsttime),
1046 source_p->localClient->send.bytes >> 10,
1047 source_p->localClient->recv.bytes >> 10);
1048 ilog(L_NOTICE, "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1049 source_p->name, (int)(CurrentTime - source_p->firsttime),
1050 source_p->localClient->send.bytes >> 10,
1051 source_p->localClient->recv.bytes >> 10);
1052 }
1053 }
1054 else if (IsClient(source_p) && !IsKilled(source_p))
1055 {
1056 sendto_server(NULL, source_p, NULL, CAP_TS6, NOCAPS, NOFLAGS,
1057 ":%s QUIT :%s", ID(source_p), comment);
1058 sendto_server(NULL, source_p, NULL, NOCAPS, CAP_TS6, NOFLAGS,
1059 ":%s QUIT :%s", source_p->name, comment);
1060 }
1061
1062 /* The client *better* be off all of the lists */
1063 assert(dlinkFind(&unknown_list, source_p) == NULL);
1064 assert(dlinkFind(&local_client_list, source_p) == NULL);
1065 assert(dlinkFind(&serv_list, source_p) == NULL);
1066 assert(dlinkFind(&oper_list, source_p) == NULL);
1067
1068 exit_one_client(source_p, comment);
1069 }
1070
1071 /*
1072 * dead_link_on_write - report a write error if not already dead,
1073 * mark it as dead then exit it
1074 */
1075 void
1076 dead_link_on_write(struct Client *client_p, int ierrno)
1077 {
1078 dlink_node *ptr;
1079
1080 if (IsDefunct(client_p))
1081 return;
1082
1083 dbuf_clear(&client_p->localClient->buf_recvq);
1084 dbuf_clear(&client_p->localClient->buf_sendq);
1085
1086 assert(dlinkFind(&abort_list, client_p) == NULL);
1087 ptr = make_dlink_node();
1088 /* don't let exit_aborted_clients() finish yet */
1089 dlinkAddTail(client_p, ptr, &abort_list);
1090
1091 if (eac_next == NULL)
1092 eac_next = ptr;
1093
1094 SetDead(client_p); /* You are dead my friend */
1095 }
1096
1097 /*
1098 * dead_link_on_read - report a read error if not already dead,
1099 * mark it as dead then exit it
1100 */
1101 void
1102 dead_link_on_read(struct Client *client_p, int error)
1103 {
1104 char errmsg[255];
1105 int current_error;
1106
1107 if (IsDefunct(client_p))
1108 return;
1109
1110 dbuf_clear(&client_p->localClient->buf_recvq);
1111 dbuf_clear(&client_p->localClient->buf_sendq);
1112
1113 current_error = get_sockerr(client_p->localClient->fd.fd);
1114
1115 if (IsServer(client_p) || IsHandshake(client_p))
1116 {
1117 int connected = CurrentTime - client_p->firsttime;
1118
1119 if (error == 0)
1120 {
1121 /* Admins get the real IP */
1122 sendto_realops_flags(UMODE_ALL, L_ADMIN,
1123 "Server %s closed the connection",
1124 get_client_name(client_p, SHOW_IP));
1125
1126 /* Opers get a masked IP */
1127 sendto_realops_flags(UMODE_ALL, L_OPER,
1128 "Server %s closed the connection",
1129 get_client_name(client_p, MASK_IP));
1130
1131 ilog(L_NOTICE, "Server %s closed the connection",
1132 get_client_name(client_p, SHOW_IP));
1133 }
1134 else
1135 {
1136 report_error(L_ADMIN, "Lost connection to %s: %d",
1137 get_client_name(client_p, SHOW_IP), current_error);
1138 report_error(L_OPER, "Lost connection to %s: %d",
1139 get_client_name(client_p, MASK_IP), current_error);
1140 }
1141
1142 sendto_realops_flags(UMODE_ALL, L_ALL,
1143 "%s had been connected for %d day%s, %2d:%02d:%02d",
1144 client_p->name, connected/86400,
1145 (connected/86400 == 1) ? "" : "s",
1146 (connected % 86400) / 3600, (connected % 3600) / 60,
1147 connected % 60);
1148 }
1149
1150 if (error == 0)
1151 strlcpy(errmsg, "Remote host closed the connection",
1152 sizeof(errmsg));
1153 else
1154 ircsprintf(errmsg, "Read error: %s",
1155 strerror(current_error));
1156
1157 exit_client(client_p, &me, errmsg);
1158 }
1159
1160 void
1161 exit_aborted_clients(void)
1162 {
1163 dlink_node *ptr;
1164 struct Client *target_p;
1165 const char *notice;
1166
1167 DLINK_FOREACH_SAFE(ptr, eac_next, abort_list.head)
1168 {
1169 target_p = ptr->data;
1170 eac_next = ptr->next;
1171
1172 if (target_p == NULL)
1173 {
1174 sendto_realops_flags(UMODE_ALL, L_ALL,
1175 "Warning: null client on abort_list!");
1176 dlinkDelete(ptr, &abort_list);
1177 free_dlink_node(ptr);
1178 continue;
1179 }
1180
1181 dlinkDelete(ptr, &abort_list);
1182
1183 if (IsSendQExceeded(target_p))
1184 notice = "Max SendQ exceeded";
1185 else
1186 notice = "Write error: connection closed";
1187
1188 exit_client(target_p, &me, notice);
1189 free_dlink_node(ptr);
1190 }
1191 }
1192
1193 /*
1194 * accept processing, this adds a form of "caller ID" to ircd
1195 *
1196 * If a client puts themselves into "caller ID only" mode,
1197 * only clients that match a client pointer they have put on
1198 * the accept list will be allowed to message them.
1199 *
1200 * [ source.on_allow_list ] -> [ target1 ] -> [ target2 ]
1201 *
1202 * [target.allow_list] -> [ source1 ] -> [source2 ]
1203 *
1204 * i.e. a target will have a link list of source pointers it will allow
1205 * each source client then has a back pointer pointing back
1206 * to the client that has it on its accept list.
1207 * This allows for exit_one_client to remove these now bogus entries
1208 * from any client having an accept on them.
1209 */
1210
1211 /* accept_message()
1212 *
1213 * inputs - pointer to source client
1214 * - pointer to target client
1215 * output - 1 if accept this message 0 if not
1216 * side effects - See if source is on target's allow list
1217 */
1218 int
1219 accept_message(struct Client *source, struct Client *target)
1220 {
1221 dlink_node *ptr;
1222
1223 DLINK_FOREACH(ptr, target->allow_list.head)
1224 {
1225 struct Client *target_p = ptr->data;
1226
1227 if (source == target_p)
1228 return (1);
1229 }
1230
1231 if (IsSoftCallerId(target))
1232 {
1233 DLINK_FOREACH(ptr, target->channel.head)
1234 if (IsMember(source, ptr->data))
1235 return (1);
1236 }
1237
1238 return (0);
1239 }
1240
1241 /* del_from_accept()
1242 *
1243 * inputs - pointer to source client
1244 * - pointer to target client
1245 * output - NONE
1246 * side effects - Delete's source pointer to targets allow list
1247 *
1248 * Walk through the target's accept list, remove if source is found,
1249 * Then walk through the source's on_accept_list remove target if found.
1250 */
1251 void
1252 del_from_accept(struct Client *source, struct Client *target)
1253 {
1254 dlink_node *ptr;
1255 dlink_node *ptr2;
1256 dlink_node *next_ptr;
1257 dlink_node *next_ptr2;
1258 struct Client *target_p;
1259
1260 DLINK_FOREACH_SAFE(ptr, next_ptr, target->allow_list.head)
1261 {
1262 target_p = ptr->data;
1263
1264 if (source == target_p)
1265 {
1266 dlinkDelete(ptr, &target->allow_list);
1267 free_dlink_node(ptr);
1268
1269 DLINK_FOREACH_SAFE(ptr2, next_ptr2, source->on_allow_list.head)
1270 {
1271 target_p = ptr2->data;
1272
1273 if (target == target_p)
1274 {
1275 dlinkDelete(ptr2, &source->on_allow_list);
1276 free_dlink_node(ptr2);
1277 }
1278 }
1279 }
1280 }
1281 }
1282
1283 /* del_all_accepts()
1284 *
1285 * inputs - pointer to exiting client
1286 * output - NONE
1287 * side effects - Walk through given clients allow_list and on_allow_list
1288 * remove all references to this client
1289 */
1290 void
1291 del_all_accepts(struct Client *client_p)
1292 {
1293 dlink_node *ptr, *next_ptr;
1294
1295 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->allow_list.head)
1296 del_from_accept(ptr->data, client_p);
1297
1298 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->on_allow_list.head)
1299 del_from_accept(client_p, ptr->data);
1300 }
1301
1302 /* del_all_their_accepts()
1303 *
1304 * inputs - pointer to exiting client
1305 * output - NONE
1306 * side effects - Walk through given clients on_allow_list
1307 * remove all references to this client,
1308 * allow this client to keep their own allow_list
1309 */
1310 void
1311 del_all_their_accepts(struct Client *client_p)
1312 {
1313 dlink_node *ptr, *next_ptr;
1314
1315 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->on_allow_list.head)
1316 del_from_accept(client_p, ptr->data);
1317 }
1318
1319 /* set_initial_nick()
1320 *
1321 * inputs
1322 * output
1323 * side effects -
1324 *
1325 * This function is only called to set up an initially registering
1326 * client.
1327 */
1328 void
1329 set_initial_nick(struct Client *client_p, struct Client *source_p,
1330 const char *nick)
1331 {
1332 char buf[USERLEN + 1];
1333
1334 /* Client setting NICK the first time */
1335
1336 /* This had to be copied here to avoid problems.. */
1337 source_p->tsinfo = CurrentTime;
1338
1339 if (source_p->name[0])
1340 hash_del_client(source_p);
1341
1342 strlcpy(source_p->name, nick, sizeof(source_p->name));
1343 hash_add_client(source_p);
1344
1345 /* fd_desc is long enough */
1346 fd_note(&client_p->localClient->fd, "Nick: %s", nick);
1347
1348 /* They have the nick they want now.. */
1349 client_p->llname[0] = '\0';
1350
1351 if (source_p->flags & FLAGS_GOTUSER)
1352 {
1353 strlcpy(buf, source_p->username, sizeof(buf));
1354
1355 /*
1356 * USER already received, now we have NICK.
1357 * *NOTE* For servers "NICK" *must* precede the
1358 * user message (giving USER before NICK is possible
1359 * only for local client connection!). register_user
1360 * may reject the client and call exit_client for it
1361 * --must test this and exit m_nick too!!!
1362 */
1363 register_local_user(client_p, source_p, nick, buf);
1364 }
1365 }
1366
1367 /* change_local_nick()
1368 *
1369 * inputs - pointer to server
1370 * - pointer to client
1371 * - nick
1372 * output -
1373 * side effects - changes nick of a LOCAL user
1374 */
1375 void
1376 change_local_nick(struct Client *client_p, struct Client *source_p, const char *nick)
1377 {
1378 /*
1379 ** Client just changing his/her nick. If he/she is
1380 ** on a channel, send note of change to all clients
1381 ** on that channel. Propagate notice to other servers.
1382 */
1383 if ((source_p->localClient->last_nick_change +
1384 ConfigFileEntry.max_nick_time) < CurrentTime)
1385 source_p->localClient->number_of_nick_changes = 0;
1386 source_p->localClient->last_nick_change = CurrentTime;
1387 source_p->localClient->number_of_nick_changes++;
1388
1389 if ((ConfigFileEntry.anti_nick_flood &&
1390 (source_p->localClient->number_of_nick_changes
1391 <= ConfigFileEntry.max_nick_changes)) ||
1392 !ConfigFileEntry.anti_nick_flood ||
1393 (IsOper(source_p) && ConfigFileEntry.no_oper_flood))
1394 {
1395 if (irccmp(source_p->name, nick))
1396 source_p->tsinfo = CurrentTime;
1397
1398 /* XXX - the format of this notice should eventually be changed
1399 * to either %s[%s@%s], or even better would be get_client_name() -bill
1400 */
1401 sendto_realops_flags(UMODE_NCHANGE, L_ALL, "Nick change: From %s to %s [%s@%s]",
1402 source_p->name, nick, source_p->username, source_p->host);
1403 sendto_common_channels_local(source_p, 1, ":%s!%s@%s NICK :%s",
1404 source_p->name, source_p->username,
1405 source_p->host, nick);
1406
1407 add_history(source_p, 1);
1408
1409 /* Only hubs care about lazy link nicks not being sent on yet
1410 * lazylink leafs/leafs always send their nicks up to hub,
1411 * hence must always propagate nick changes.
1412 * hubs might not propagate a nick change, if the leaf
1413 * does not know about that client yet.
1414 */
1415 sendto_server(client_p, source_p, NULL, CAP_TS6, NOCAPS, NOFLAGS,
1416 ":%s NICK %s :%lu",
1417 ID(source_p), nick, (unsigned long)source_p->tsinfo);
1418 sendto_server(client_p, source_p, NULL, NOCAPS, CAP_TS6, NOFLAGS,
1419 ":%s NICK %s :%lu",
1420 source_p->name, nick, (unsigned long)source_p->tsinfo);
1421 }
1422 else
1423 {
1424 sendto_one(source_p, form_str(ERR_NICKTOOFAST),
1425 me.name, source_p->name, source_p->name,
1426 nick, ConfigFileEntry.max_nick_time);
1427 return;
1428 }
1429
1430 /* Finally, add to hash */
1431 if (source_p->name[0])
1432 hash_del_client(source_p);
1433
1434 strcpy(source_p->name, nick);
1435 hash_add_client(source_p);
1436
1437 /* Make sure everyone that has this client on its accept list
1438 * loses that reference.
1439 */
1440 del_all_their_accepts(source_p);
1441
1442 /* fd_desc is long enough */
1443 fd_note(&client_p->localClient->fd, "Nick: %s", nick);
1444 }

Properties

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