2 * IRC - Internet Relay Chat, ircd/list.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Finland
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 1, or (at your option)
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include "ircd_alloc.h"
28 #include "ircd_events.h"
29 #include "ircd_reply.h"
30 #include "ircd_string.h"
47 #include <stddef.h> /* offsetof */
48 #include <unistd.h> /* close */
52 static struct liststats {
54 } clients, connections, users, servs, links;
57 static unsigned int clientAllocCount;
58 static struct Client* clientFreeList;
60 static unsigned int connectionAllocCount;
61 static struct Connection* connectionFreeList;
63 static unsigned int slinkAllocCount;
64 static struct SLink* slinkFreeList;
69 struct Connection* con;
72 * pre-allocate MAXCONNECTIONS clients and connections
74 for (i = 0; i < MAXCONNECTIONS; ++i) {
75 cptr = (struct Client*) MyMalloc(sizeof(struct Client));
76 cli_next(cptr) = clientFreeList;
77 clientFreeList = cptr;
80 con = (struct Connection*) MyMalloc(sizeof(struct Connection));
81 con_next(con) = connectionFreeList;
82 connectionFreeList = con;
83 ++connectionAllocCount;
87 memset(&clients, 0, sizeof(clients));
88 memset(&connections, 0, sizeof(connections));
89 memset(&users, 0, sizeof(users));
90 memset(&servs, 0, sizeof(servs));
91 memset(&links, 0, sizeof(links));
95 static struct Client* alloc_client(void)
97 struct Client* cptr = clientFreeList;
100 cptr = (struct Client*) MyMalloc(sizeof(struct Client));
103 clientFreeList = cli_next(cptr);
109 memset(cptr, 0, sizeof(struct Client));
114 static void dealloc_client(struct Client* cptr)
116 assert(cli_verify(cptr));
117 assert(0 == cli_connect(cptr));
123 cli_next(cptr) = clientFreeList;
124 clientFreeList = cptr;
129 static struct Connection* alloc_connection(void)
131 struct Connection* con = connectionFreeList;
134 con = (struct Connection*) MyMalloc(sizeof(struct Connection));
135 ++connectionAllocCount;
137 connectionFreeList = con_next(con);
143 memset(con, 0, sizeof(struct Connection));
144 timer_init(&(con_proc(con)));
149 static void dealloc_connection(struct Connection* con)
151 assert(con_verify(con));
152 assert(!t_active(&(con_proc(con))));
153 assert(!t_onqueue(&(con_proc(con))));
155 Debug((DEBUG_LIST, "Deallocating connection %p", con));
158 if (con_dns_reply(con)) {
159 MyFree(con_dns_reply(con));
160 con_dns_reply(con) = 0;
162 if (-1 < con_fd(con))
164 MsgQClear(&(con_sendQ(con)));
165 client_drop_sendq(con);
166 DBufClear(&(con_recvQ(con)));
167 if (con_listener(con))
168 release_listener(con_listener(con));
174 con_next(con) = connectionFreeList;
175 connectionFreeList = con;
181 * Create a new struct Client structure and set it to initial state.
183 * from == NULL, create local client (a client connected to a socket).
185 * from != NULL, create remote client (behind a socket associated with
186 * the client defined by 'from').
187 * ('from' is a local client!!).
189 struct Client* make_client(struct Client *from, int status)
191 struct Client* cptr = 0;
192 struct Connection* con = 0;
194 assert(!from || cli_verify(from));
196 cptr = alloc_client();
199 assert(!cli_magic(cptr));
200 assert(0 == from || 0 != cli_connect(from));
202 if (!from) { /* local client, allocate a struct Connection */
203 con = alloc_connection();
206 assert(!con_magic(con));
208 con_magic(con) = CONNECTION_MAGIC;
209 con_fd(con) = -1; /* initialize struct Connection */
210 con_freeflag(con) = 0;
211 con_nextnick(con) = CurrentTime - NICK_DELAY;
212 con_nexttarget(con) = CurrentTime - (TARGET_DELAY * (STARTTARGETS - 1));
213 con_handler(con) = UNREGISTERED_HANDLER;
214 con_client(con) = cptr;
216 cli_local(cptr) = 1; /* Set certain fields of the struct Client */
217 cli_since(cptr) = cli_lasttime(cptr) = cli_firsttime(cptr) = CurrentTime;
218 cli_lastnick(cptr) = TStime();
220 con = cli_connect(from); /* use 'from's connection */
223 assert(con_verify(con));
225 cli_magic(cptr) = CLIENT_MAGIC;
226 cli_connect(cptr) = con; /* set the connection and other fields */
227 cli_status(cptr) = status;
228 cli_hnext(cptr) = cptr;
229 strcpy(cli_username(cptr), "unknown");
234 void free_connection(struct Connection* con)
239 assert(con_verify(con));
240 assert(0 == con_client(con));
242 dealloc_connection(con); /* deallocate the connection */
245 void free_client(struct Client* cptr)
250 * forget to remove the client from the hash table?
252 assert(cli_verify(cptr));
253 assert(cli_hnext(cptr) == cptr);
254 /* or from linked list? */
255 assert(cli_next(cptr) == 0);
256 assert(cli_prev(cptr) == 0);
258 Debug((DEBUG_LIST, "Freeing client %s [%p], connection %p", cli_name(cptr),
259 cptr, cli_connect(cptr)));
262 destroy_auth_request(cli_auth(cptr), 0);
264 /* Make sure we didn't magically get re-added to the list */
265 assert(cli_next(cptr) == 0);
266 assert(cli_prev(cptr) == 0);
268 if (cli_from(cptr) == cptr) { /* in other words, we're local */
270 /* timer must be marked as not active */
271 if (!cli_freeflag(cptr) && !t_active(&(cli_proc(cptr))))
272 dealloc_connection(cli_connect(cptr)); /* connection not open anymore */
274 if (-1 < cli_fd(cptr) && cli_freeflag(cptr) & FREEFLAG_SOCKET)
275 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
276 if (cli_freeflag(cptr) & FREEFLAG_TIMER)
277 timer_del(&(cli_proc(cptr))); /* queue a timer delete */
281 cli_connect(cptr) = 0;
283 dealloc_client(cptr); /* actually destroy the client */
286 struct Server *make_server(struct Client *cptr)
288 struct Server *serv = cli_serv(cptr);
290 assert(cli_verify(cptr));
294 serv = (struct Server*) MyMalloc(sizeof(struct Server));
296 memset(serv, 0, sizeof(struct Server)); /* All variables are 0 by default */
300 cli_serv(cptr) = serv;
301 cli_serv(cptr)->lag = 60000;
303 DupString(serv->last_error_msg, "<>"); /* String must be non-empty */
305 return cli_serv(cptr);
309 * Taken the code from ExitOneClient() for this and placed it here.
312 void remove_client_from_list(struct Client *cptr)
314 assert(cli_verify(cptr));
315 assert(con_verify(cli_connect(cptr)));
316 assert(!cli_prev(cptr) || cli_verify(cli_prev(cptr)));
317 assert(!cli_next(cptr) || cli_verify(cli_next(cptr)));
320 /* Only try remove cptr from the list if it IS in the list.
321 * cli_next(cptr) cannot be NULL here, as &me is always the end
322 * the list, and we never remove &me. -GW
327 cli_next(cli_prev(cptr)) = cli_next(cptr);
329 GlobalClientList = cli_next(cptr);
330 cli_prev(GlobalClientList) = 0;
332 cli_prev(cli_next(cptr)) = cli_prev(cptr);
334 cli_next(cptr) = cli_prev(cptr) = 0;
336 if (IsUser(cptr) && cli_user(cptr)) {
337 add_history(cptr, 0);
340 if (cli_user(cptr)) {
341 free_user(cli_user(cptr));
345 if (cli_serv(cptr)) {
346 if (cli_serv(cptr)->user) {
347 free_user(cli_serv(cptr)->user);
348 cli_serv(cptr)->user = 0;
350 if (cli_serv(cptr)->client_list)
351 MyFree(cli_serv(cptr)->client_list);
352 MyFree(cli_serv(cptr)->last_error_msg);
353 MyFree(cli_serv(cptr));
362 * Although only a small routine, it appears in a number of places
363 * as a collection of a few lines...functions like this *should* be
364 * in this file, shouldnt they ? after all, this is list.c, isn't it ?
367 void add_client_to_list(struct Client *cptr)
369 assert(cli_verify(cptr));
370 assert(cli_next(cptr) == 0);
371 assert(cli_prev(cptr) == 0);
374 * Since we always insert new clients to the top of the list,
375 * this should mean the "me" is the bottom most item in the list.
376 * XXX - don't always count on the above, things change
379 cli_next(cptr) = GlobalClientList;
380 GlobalClientList = cptr;
382 cli_prev(cli_next(cptr)) = cptr;
386 /* WARNING: Major CPU sink!
388 * This is a debugging routine meant to verify the integrity of the client
389 * linked list. It is meant to be comprehensive, to detect *any* corruption
390 * of that list. This means that it will be majorly CPU-intensive, and
391 * should *only* be enabled on servers that have DEBUGMODE enabled. Ignore
392 * this warning at your peril!
394 void verify_client_list(void)
396 struct Client *client, *prev = 0, *sentinel = 0;
397 extern unsigned int ircrandom(void);
399 for (client = GlobalClientList; client; client = cli_next(client)) {
400 /* Verify that this is a valid client, not a free'd one */
401 assert(cli_verify(client));
402 /* Verify that the list hasn't suddenly jumped around */
403 assert(cli_prev(client) == prev);
404 /* Verify that the list hasn't become circular */
405 assert(cli_next(client) != GlobalClientList);
406 assert(!sentinel || client != sentinel);
408 prev = client; /* Remember what should preceed us */
409 if (!(ircrandom() % 50)) /* probabilistic loop detector */
413 #endif /* DEBUGMODE */
416 * Look for ptr in the linked listed pointed to by link.
418 struct SLink *find_user_link(struct SLink *lp, struct Client *ptr)
422 if (lp->value.cptr == ptr)
430 struct SLink* make_link(void)
432 struct SLink* lp = slinkFreeList;
434 slinkFreeList = lp->next;
436 lp = (struct SLink*) MyMalloc(sizeof(struct SLink));
446 void free_link(struct SLink* lp)
449 lp->next = slinkFreeList;
457 struct DLink *add_dlink(struct DLink **lpp, struct Client *cp)
459 struct DLink* lp = (struct DLink*) MyMalloc(sizeof(struct DLink));
463 if ((lp->next = *lpp))
469 void remove_dlink(struct DLink **lpp, struct DLink *lp)
475 if ((lp->prev->next = lp->next))
476 lp->next->prev = lp->prev;
478 else if ((*lpp = lp->next))
479 lp->next->prev = NULL;
484 void send_listinfo(struct Client *cptr, char *name)
486 int inuse = 0, mem = 0, tmp = 0;
488 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Clients: inuse: %d(%d)",
489 clients.inuse, tmp = clients.inuse * sizeof(struct Client));
491 inuse += clients.inuse;
492 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, "Connections: inuse: %d(%d)",
494 tmp = connections.inuse * sizeof(struct Connection));
496 inuse += connections.inuse;
497 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Users: inuse: %d(%d)",
498 users.inuse, tmp = users.inuse * sizeof(struct User));
500 inuse += users.inuse;
501 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Servs: inuse: %d(%d)",
502 servs.inuse, tmp = servs.inuse * sizeof(struct Server));
504 inuse += servs.inuse;
505 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Links: inuse: %d(%d)",
506 links.inuse, tmp = links.inuse * sizeof(struct SLink));
508 inuse += links.inuse;
509 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Confs: inuse: %d(%d)",
510 GlobalConfCount, tmp = GlobalConfCount * sizeof(struct ConfItem));
512 inuse += GlobalConfCount;
513 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Totals: inuse %d %d",