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root/svn/ircd-hybrid-8/src/client.c
Revision: 1118
Committed: Thu Jan 6 13:39:10 2011 UTC (13 years, 2 months ago) by michael
Content type: text/x-csrc
Original Path: ircd-hybrid-7.3/src/client.c
File size: 39404 byte(s)
Log Message:
- cleanup and sanitize m_server.c. remove hostmasking. Improve TS6 suppport

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 "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 (IsClient(source_p))
723 {
724 if (source_p->servptr->serv != NULL)
725 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->client_list);
726
727 /*
728 * If a person is on a channel, send a QUIT notice
729 * to every client (person) on the same channel (so
730 * that the client can show the "**signoff" message).
731 * (Note: The notice is to the local clients *only*)
732 */
733 sendto_common_channels_local(source_p, 0, ":%s!%s@%s QUIT :%s",
734 source_p->name, source_p->username,
735 source_p->host, quitmsg);
736 DLINK_FOREACH_SAFE(lp, next_lp, source_p->channel.head)
737 remove_user_from_channel(lp->data);
738
739 add_history(source_p, 0);
740 off_history(source_p);
741
742 watch_check_hash(source_p, RPL_LOGOFF);
743
744 if (MyConnect(source_p))
745 {
746 /* Clean up invitefield */
747 DLINK_FOREACH_SAFE(lp, next_lp, source_p->localClient->invited.head)
748 del_invite(lp->data, source_p);
749
750 del_all_accepts(source_p);
751 }
752 }
753 else if (IsServer(source_p))
754 {
755 dlinkDelete(&source_p->lnode, &source_p->servptr->serv->server_list);
756
757 if ((lp = dlinkFindDelete(&global_serv_list, source_p)) != NULL)
758 free_dlink_node(lp);
759 }
760
761 /* Remove source_p from the client lists */
762 if (HasID(source_p))
763 hash_del_id(source_p);
764 if (source_p->name[0])
765 hash_del_client(source_p);
766
767 if (IsUserHostIp(source_p))
768 delete_user_host(source_p->username, source_p->host, !MyConnect(source_p));
769
770 /* remove from global client list
771 * NOTE: source_p->node.next cannot be NULL if the client is added
772 * to global_client_list (there is always &me at its end)
773 */
774 if (source_p != NULL && source_p->node.next != NULL)
775 dlinkDelete(&source_p->node, &global_client_list);
776
777 update_client_exit_stats(source_p);
778
779 /* Check to see if the client isn't already on the dead list */
780 assert(dlinkFind(&dead_list, source_p) == NULL);
781
782 /* add to dead client dlist */
783 SetDead(source_p);
784 dlinkAdd(source_p, make_dlink_node(), &dead_list);
785 }
786
787 /* Recursively send QUITs and SQUITs for source_p and all its dependent clients
788 * and servers to those servers that need them. A server needs the client
789 * QUITs if it can't figure them out from the SQUIT (ie pre-TS4) or if it
790 * isn't getting the SQUIT because of @#(*&@)# hostmasking. With TS4, once
791 * a link gets a SQUIT, it doesn't need any QUIT/SQUITs for clients depending
792 * on that one -orabidoo
793 *
794 * This is now called on each local server -adx
795 */
796 static void
797 recurse_send_quits(struct Client *original_source_p, struct Client *source_p,
798 struct Client *from, struct Client *to, const char *comment,
799 const char *splitstr)
800 {
801 dlink_node *ptr, *next;
802 struct Client *target_p;
803 int hidden = match(me.name, source_p->name); /* XXX */
804
805 assert(to != source_p); /* should be already removed from serv_list */
806
807 /* If this server can handle quit storm (QS) removal
808 * of dependents, just send the SQUIT
809 *
810 * Always check *all* dependent servers if some of them are
811 * hidden behind fakename. If so, send out the QUITs -adx
812 */
813 if (hidden || !IsCapable(to, CAP_QS))
814 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
815 {
816 target_p = ptr->data;
817 sendto_one(to, ":%s QUIT :%s", target_p->name, splitstr);
818 }
819
820 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
821 recurse_send_quits(original_source_p, ptr->data, from, to,
822 comment, splitstr);
823
824 if (!hidden && ((source_p == original_source_p && to != from) ||
825 !IsCapable(to, CAP_QS)))
826 {
827 /* don't use a prefix here - we have to be 100% sure the message
828 * will be accepted without Unknown prefix etc.. */
829 sendto_one(to, "SQUIT %s :%s", ID_or_name(source_p, to), comment);
830 }
831 }
832
833 /*
834 * Remove all clients that depend on source_p; assumes all (S)QUITs have
835 * already been sent. we make sure to exit a server's dependent clients
836 * and servers before the server itself; exit_one_client takes care of
837 * actually removing things off llists. tweaked from +CSr31 -orabidoo
838 */
839 static void
840 recurse_remove_clients(struct Client *source_p, const char *quitmsg)
841 {
842 dlink_node *ptr, *next;
843
844 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->client_list.head)
845 exit_one_client(ptr->data, quitmsg);
846
847 DLINK_FOREACH_SAFE(ptr, next, source_p->serv->server_list.head)
848 {
849 recurse_remove_clients(ptr->data, quitmsg);
850 exit_one_client(ptr->data, quitmsg);
851 }
852 }
853
854 /*
855 ** Remove *everything* that depends on source_p, from all lists, and sending
856 ** all necessary QUITs and SQUITs. source_p itself is still on the lists,
857 ** and its SQUITs have been sent except for the upstream one -orabidoo
858 */
859 static void
860 remove_dependents(struct Client *source_p, struct Client *from,
861 const char *comment, const char *splitstr)
862 {
863 dlink_node *ptr = NULL;
864
865 DLINK_FOREACH(ptr, serv_list.head)
866 recurse_send_quits(source_p, source_p, from, ptr->data,
867 comment, splitstr);
868
869 recurse_remove_clients(source_p, splitstr);
870 }
871
872 /*
873 * exit_client - exit a client of any type. Generally, you can use
874 * this on any struct Client, regardless of its state.
875 *
876 * Note, you shouldn't exit remote _users_ without first doing
877 * SetKilled and propagating a kill or similar message. However,
878 * it is perfectly correct to call exit_client to force a _server_
879 * quit (either local or remote one).
880 *
881 * inputs: - a client pointer that is going to be exited
882 * - for servers, the second argument is a pointer to who
883 * is firing the server. This side won't get any generated
884 * messages. NEVER NULL!
885 * output: none
886 * side effects: the client is delinked from all lists, disconnected,
887 * and the rest of IRC network is notified of the exit.
888 * Client memory is scheduled to be freed
889 */
890 void
891 exit_client(struct Client *source_p, struct Client *from, const char *comment)
892 {
893 dlink_node *m = NULL;
894
895 if (MyConnect(source_p))
896 {
897 /* DO NOT REMOVE. exit_client can be called twice after a failed
898 * read/write.
899 */
900 if (IsClosing(source_p))
901 return;
902
903 SetClosing(source_p);
904
905 if (IsIpHash(source_p))
906 remove_one_ip(&source_p->localClient->ip);
907
908 if (source_p->localClient->auth)
909 {
910 delete_auth(source_p->localClient->auth);
911 source_p->localClient->auth = NULL;
912 }
913
914 /* This source_p could have status of one of STAT_UNKNOWN, STAT_CONNECTING
915 * STAT_HANDSHAKE or STAT_UNKNOWN
916 * all of which are lumped together into unknown_list
917 *
918 * In all above cases IsRegistered() will not be true.
919 */
920 if (!IsRegistered(source_p))
921 {
922 if ((m = dlinkFindDelete(&unknown_list, source_p)) != NULL)
923 free_dlink_node(m);
924 }
925 else if (IsClient(source_p))
926 {
927 assert(Count.local > 0);
928 Count.local--;
929
930 if (IsOper(source_p))
931 {
932 if ((m = dlinkFindDelete(&oper_list, source_p)) != NULL)
933 free_dlink_node(m);
934 }
935
936 dlinkDelete(&source_p->localClient->lclient_node, &local_client_list);
937 if (source_p->localClient->list_task != NULL)
938 free_list_task(source_p->localClient->list_task, source_p);
939
940 watch_del_watch_list(source_p);
941 sendto_realops_flags(UMODE_CCONN, L_ALL, "Client exiting: %s (%s@%s) [%s] [%s]",
942 source_p->name, source_p->username, source_p->host, comment,
943 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
944 "255.255.255.255" : source_p->sockhost);
945 sendto_realops_flags(UMODE_CCONN_FULL, L_ALL, "CLIEXIT: %s %s %s %s 0 %s",
946 source_p->name,
947 source_p->username,
948 source_p->host,
949
950 ConfigFileEntry.hide_spoof_ips && IsIPSpoof(source_p) ?
951 "255.255.255.255" : source_p->sockhost,
952 comment);
953 }
954
955 /* As soon as a client is known to be a server of some sort
956 * it has to be put on the serv_list, or SJOIN's to this new server
957 * from the connect burst will not be seen.
958 */
959 if (IsServer(source_p) || IsConnecting(source_p) ||
960 IsHandshake(source_p))
961 {
962 if ((m = dlinkFindDelete(&serv_list, source_p)) != NULL)
963 {
964 free_dlink_node(m);
965 unset_chcap_usage_counts(source_p);
966 }
967
968 if (IsServer(source_p))
969 Count.myserver--;
970 }
971
972 log_user_exit(source_p);
973
974 if (!IsDead(source_p))
975 {
976 if (IsServer(source_p))
977 {
978 /* for them, we are exiting the network */
979 sendto_one(source_p, ":%s SQUIT %s :%s",
980 ID_or_name(from, source_p), me.name, comment);
981 }
982
983 sendto_one(source_p, "ERROR :Closing Link: %s (%s)",
984 source_p->host, comment);
985 }
986
987 /*
988 ** Currently only server connections can have
989 ** depending remote clients here, but it does no
990 ** harm to check for all local clients. In
991 ** future some other clients than servers might
992 ** have remotes too...
993 **
994 ** Close the Client connection first and mark it
995 ** so that no messages are attempted to send to it.
996 ** Remember it makes source_p->from == NULL.
997 */
998 close_connection(source_p);
999 }
1000
1001 if (IsServer(source_p))
1002 {
1003 char splitstr[HOSTLEN + HOSTLEN + 2];
1004
1005 /* This shouldn't ever happen */
1006 assert(source_p->serv != NULL && source_p->servptr != NULL);
1007
1008 if (ConfigServerHide.hide_servers)
1009 /*
1010 * Set netsplit message to "*.net *.split" to still show
1011 * that its a split, but hide the servers splitting
1012 */
1013 strcpy(splitstr, "*.net *.split");
1014 else
1015 snprintf(splitstr, sizeof(splitstr), "%s %s",
1016 source_p->servptr->name, source_p->name);
1017
1018 remove_dependents(source_p, from->from, comment, splitstr);
1019
1020 if (source_p->servptr == &me)
1021 {
1022 sendto_realops_flags(UMODE_ALL, L_ALL,
1023 "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1024 source_p->name, (int)(CurrentTime - source_p->firsttime),
1025 source_p->localClient->send.bytes >> 10,
1026 source_p->localClient->recv.bytes >> 10);
1027 ilog(L_NOTICE, "%s was connected for %d seconds. %llu/%llu sendK/recvK.",
1028 source_p->name, (int)(CurrentTime - source_p->firsttime),
1029 source_p->localClient->send.bytes >> 10,
1030 source_p->localClient->recv.bytes >> 10);
1031 }
1032 }
1033 else if (IsClient(source_p) && !IsKilled(source_p))
1034 {
1035 sendto_server(from->from, NULL, CAP_TS6, NOCAPS,
1036 ":%s QUIT :%s", ID(source_p), comment);
1037 sendto_server(from->from, NULL, NOCAPS, CAP_TS6,
1038 ":%s QUIT :%s", source_p->name, comment);
1039 }
1040
1041 /* The client *better* be off all of the lists */
1042 assert(dlinkFind(&unknown_list, source_p) == NULL);
1043 assert(dlinkFind(&local_client_list, source_p) == NULL);
1044 assert(dlinkFind(&serv_list, source_p) == NULL);
1045 assert(dlinkFind(&oper_list, source_p) == NULL);
1046
1047 exit_one_client(source_p, comment);
1048 }
1049
1050 /*
1051 * dead_link_on_write - report a write error if not already dead,
1052 * mark it as dead then exit it
1053 */
1054 void
1055 dead_link_on_write(struct Client *client_p, int ierrno)
1056 {
1057 dlink_node *ptr;
1058
1059 if (IsDefunct(client_p))
1060 return;
1061
1062 dbuf_clear(&client_p->localClient->buf_recvq);
1063 dbuf_clear(&client_p->localClient->buf_sendq);
1064
1065 assert(dlinkFind(&abort_list, client_p) == NULL);
1066 ptr = make_dlink_node();
1067 /* don't let exit_aborted_clients() finish yet */
1068 dlinkAddTail(client_p, ptr, &abort_list);
1069
1070 if (eac_next == NULL)
1071 eac_next = ptr;
1072
1073 SetDead(client_p); /* You are dead my friend */
1074 }
1075
1076 /*
1077 * dead_link_on_read - report a read error if not already dead,
1078 * mark it as dead then exit it
1079 */
1080 void
1081 dead_link_on_read(struct Client *client_p, int error)
1082 {
1083 char errmsg[255];
1084 int current_error;
1085
1086 if (IsDefunct(client_p))
1087 return;
1088
1089 dbuf_clear(&client_p->localClient->buf_recvq);
1090 dbuf_clear(&client_p->localClient->buf_sendq);
1091
1092 current_error = get_sockerr(client_p->localClient->fd.fd);
1093
1094 if (IsServer(client_p) || IsHandshake(client_p))
1095 {
1096 int connected = CurrentTime - client_p->firsttime;
1097
1098 if (error == 0)
1099 {
1100 /* Admins get the real IP */
1101 sendto_realops_flags(UMODE_ALL, L_ADMIN,
1102 "Server %s closed the connection",
1103 get_client_name(client_p, SHOW_IP));
1104
1105 /* Opers get a masked IP */
1106 sendto_realops_flags(UMODE_ALL, L_OPER,
1107 "Server %s closed the connection",
1108 get_client_name(client_p, MASK_IP));
1109
1110 ilog(L_NOTICE, "Server %s closed the connection",
1111 get_client_name(client_p, SHOW_IP));
1112 }
1113 else
1114 {
1115 report_error(L_ADMIN, "Lost connection to %s: %s",
1116 get_client_name(client_p, SHOW_IP), current_error);
1117 report_error(L_OPER, "Lost connection to %s: %s",
1118 get_client_name(client_p, MASK_IP), current_error);
1119 }
1120
1121 sendto_realops_flags(UMODE_ALL, L_ALL,
1122 "%s had been connected for %d day%s, %2d:%02d:%02d",
1123 client_p->name, connected/86400,
1124 (connected/86400 == 1) ? "" : "s",
1125 (connected % 86400) / 3600, (connected % 3600) / 60,
1126 connected % 60);
1127 }
1128
1129 if (error == 0)
1130 strlcpy(errmsg, "Remote host closed the connection",
1131 sizeof(errmsg));
1132 else
1133 ircsprintf(errmsg, "Read error: %s",
1134 strerror(current_error));
1135
1136 exit_client(client_p, &me, errmsg);
1137 }
1138
1139 void
1140 exit_aborted_clients(void)
1141 {
1142 dlink_node *ptr;
1143 struct Client *target_p;
1144 const char *notice;
1145
1146 DLINK_FOREACH_SAFE(ptr, eac_next, abort_list.head)
1147 {
1148 target_p = ptr->data;
1149 eac_next = ptr->next;
1150
1151 if (target_p == NULL)
1152 {
1153 sendto_realops_flags(UMODE_ALL, L_ALL,
1154 "Warning: null client on abort_list!");
1155 dlinkDelete(ptr, &abort_list);
1156 free_dlink_node(ptr);
1157 continue;
1158 }
1159
1160 dlinkDelete(ptr, &abort_list);
1161
1162 if (IsSendQExceeded(target_p))
1163 notice = "Max SendQ exceeded";
1164 else
1165 notice = "Write error: connection closed";
1166
1167 exit_client(target_p, &me, notice);
1168 free_dlink_node(ptr);
1169 }
1170 }
1171
1172 /*
1173 * accept processing, this adds a form of "caller ID" to ircd
1174 *
1175 * If a client puts themselves into "caller ID only" mode,
1176 * only clients that match a client pointer they have put on
1177 * the accept list will be allowed to message them.
1178 *
1179 * Diane Bruce, "Dianora" db@db.net
1180 */
1181
1182 void
1183 del_accept(struct split_nuh_item *accept_p, struct Client *client_p)
1184 {
1185 dlinkDelete(&accept_p->node, &client_p->localClient->acceptlist);
1186
1187 MyFree(accept_p->nickptr);
1188 MyFree(accept_p->userptr);
1189 MyFree(accept_p->hostptr);
1190 MyFree(accept_p);
1191 }
1192
1193 struct split_nuh_item *
1194 find_accept(const char *nick, const char *user,
1195 const char *host, struct Client *client_p, int do_match)
1196 {
1197 dlink_node *ptr = NULL;
1198 /* XXX We wouldn't need that if match() would return 0 on match */
1199 int (*cmpfunc)(const char *, const char *) = do_match ? match : irccmp;
1200
1201 DLINK_FOREACH(ptr, client_p->localClient->acceptlist.head)
1202 {
1203 struct split_nuh_item *accept_p = ptr->data;
1204
1205 if (cmpfunc(accept_p->nickptr, nick) == do_match &&
1206 cmpfunc(accept_p->userptr, user) == do_match &&
1207 cmpfunc(accept_p->hostptr, host) == do_match)
1208 return accept_p;
1209 }
1210
1211 return NULL;
1212 }
1213
1214 /* accept_message()
1215 *
1216 * inputs - pointer to source client
1217 * - pointer to target client
1218 * output - 1 if accept this message 0 if not
1219 * side effects - See if source is on target's allow list
1220 */
1221 int
1222 accept_message(struct Client *source,
1223 struct Client *target)
1224 {
1225 dlink_node *ptr = NULL;
1226
1227 if (source == target || find_accept(source->name, source->username,
1228 source->host, target, 1))
1229 return 1;
1230
1231 if (IsSoftCallerId(target))
1232 DLINK_FOREACH(ptr, target->channel.head)
1233 if (IsMember(source, ((struct Membership *)ptr->data)->chptr))
1234 return 1;
1235
1236 return 0;
1237 }
1238
1239 /* del_all_accepts()
1240 *
1241 * inputs - pointer to exiting client
1242 * output - NONE
1243 * side effects - Walk through given clients acceptlist and remove all entries
1244 */
1245 void
1246 del_all_accepts(struct Client *client_p)
1247 {
1248 dlink_node *ptr = NULL, *next_ptr = NULL;
1249
1250 DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->localClient->acceptlist.head)
1251 del_accept(ptr->data, client_p);
1252 }
1253
1254 /* change_local_nick()
1255 *
1256 * inputs - pointer to server
1257 * - pointer to client
1258 * - nick
1259 * output -
1260 * side effects - changes nick of a LOCAL user
1261 */
1262 void
1263 change_local_nick(struct Client *client_p, struct Client *source_p, const char *nick)
1264 {
1265 int samenick = 0;
1266
1267 assert(source_p->name[0] && !EmptyString(nick));
1268
1269 /*
1270 * Client just changing his/her nick. If he/she is
1271 * on a channel, send note of change to all clients
1272 * on that channel. Propagate notice to other servers.
1273 */
1274 if ((source_p->localClient->last_nick_change +
1275 ConfigFileEntry.max_nick_time) < CurrentTime)
1276 source_p->localClient->number_of_nick_changes = 0;
1277 source_p->localClient->last_nick_change = CurrentTime;
1278 source_p->localClient->number_of_nick_changes++;
1279
1280 if ((ConfigFileEntry.anti_nick_flood &&
1281 (source_p->localClient->number_of_nick_changes
1282 <= ConfigFileEntry.max_nick_changes)) ||
1283 !ConfigFileEntry.anti_nick_flood ||
1284 (IsOper(source_p) && ConfigFileEntry.no_oper_flood))
1285 {
1286 samenick = !irccmp(source_p->name, nick);
1287
1288 if (!samenick)
1289 {
1290 source_p->tsinfo = CurrentTime;
1291 clear_ban_cache_client(source_p);
1292 watch_check_hash(source_p, RPL_LOGOFF);
1293 }
1294
1295 /* XXX - the format of this notice should eventually be changed
1296 * to either %s[%s@%s], or even better would be get_client_name() -bill
1297 */
1298 sendto_realops_flags(UMODE_NCHANGE, L_ALL, "Nick change: From %s to %s [%s@%s]",
1299 source_p->name, nick, source_p->username, source_p->host);
1300 sendto_common_channels_local(source_p, 1, ":%s!%s@%s NICK :%s",
1301 source_p->name, source_p->username,
1302 source_p->host, nick);
1303 add_history(source_p, 1);
1304
1305 sendto_server(client_p, NULL, CAP_TS6, NOCAPS,
1306 ":%s NICK %s :%lu",
1307 ID(source_p), nick, (unsigned long)source_p->tsinfo);
1308 sendto_server(client_p, NULL, NOCAPS, CAP_TS6,
1309 ":%s NICK %s :%lu",
1310 source_p->name, nick, (unsigned long)source_p->tsinfo);
1311
1312 hash_del_client(source_p);
1313 strcpy(source_p->name, nick);
1314 hash_add_client(source_p);
1315
1316 if (!samenick)
1317 watch_check_hash(source_p, RPL_LOGON);
1318
1319 /* fd_desc is long enough */
1320 fd_note(&client_p->localClient->fd, "Nick: %s", nick);
1321 }
1322 else
1323 sendto_one(source_p, form_str(ERR_NICKTOOFAST),
1324 me.name, source_p->name, source_p->name,
1325 nick, ConfigFileEntry.max_nick_time);
1326 }

Properties

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