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

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Revision 2682 - (show annotations)
Sun Dec 15 18:40:09 2013 UTC (8 years, 8 months ago) by michael
File MIME type: text/x-chdr
File size: 36217 byte(s)
- client.c: #include "parse.h"

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

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