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"
46 #include <stddef.h> /* offsetof */
47 #include <unistd.h> /* close */
51 static struct liststats {
53 } clients, connections, users, servs, links;
56 static unsigned int clientAllocCount;
57 static struct Client* clientFreeList;
59 static unsigned int connectionAllocCount;
60 static struct Connection* connectionFreeList;
62 static unsigned int slinkAllocCount;
63 static struct SLink* slinkFreeList;
68 struct Connection* con;
71 * pre-allocate MAXCONNECTIONS clients and connections
73 for (i = 0; i < MAXCONNECTIONS; ++i) {
74 cptr = (struct Client*) MyMalloc(sizeof(struct Client));
75 cli_next(cptr) = clientFreeList;
76 clientFreeList = cptr;
79 con = (struct Connection*) MyMalloc(sizeof(struct Connection));
80 con_next(con) = connectionFreeList;
81 connectionFreeList = con;
82 ++connectionAllocCount;
86 memset(&clients, 0, sizeof(clients));
87 memset(&connections, 0, sizeof(connections));
88 memset(&users, 0, sizeof(users));
89 memset(&servs, 0, sizeof(servs));
90 memset(&links, 0, sizeof(links));
94 static struct Client* alloc_client(void)
96 struct Client* cptr = clientFreeList;
99 cptr = (struct Client*) MyMalloc(sizeof(struct Client));
102 clientFreeList = cli_next(cptr);
108 memset(cptr, 0, sizeof(struct Client));
113 static void dealloc_client(struct Client* cptr)
115 assert(cli_verify(cptr));
116 assert(0 == cli_connect(cptr));
122 cli_next(cptr) = clientFreeList;
123 clientFreeList = cptr;
128 static struct Connection* alloc_connection(void)
130 struct Connection* con = connectionFreeList;
133 con = (struct Connection*) MyMalloc(sizeof(struct Connection));
134 ++connectionAllocCount;
136 connectionFreeList = con_next(con);
142 memset(con, 0, sizeof(struct Connection));
143 timer_init(&(con_proc(con)));
148 static void dealloc_connection(struct Connection* con)
150 assert(con_verify(con));
151 assert(!t_active(&(con_proc(con))));
152 assert(!t_onqueue(&(con_proc(con))));
154 Debug((DEBUG_LIST, "Deallocating connection %p", con));
157 if (con_dns_reply(con)) {
158 MyFree(con_dns_reply(con));
159 con_dns_reply(con) = 0;
161 if (-1 < con_fd(con))
163 MsgQClear(&(con_sendQ(con)));
164 client_drop_sendq(con);
165 DBufClear(&(con_recvQ(con)));
166 if (con_listener(con))
167 release_listener(con_listener(con));
173 con_next(con) = connectionFreeList;
174 connectionFreeList = con;
180 * Create a new struct Client structure and set it to initial state.
182 * from == NULL, create local client (a client connected to a socket).
184 * from != NULL, create remote client (behind a socket associated with
185 * the client defined by 'from').
186 * ('from' is a local client!!).
188 struct Client* make_client(struct Client *from, int status)
190 struct Client* cptr = 0;
191 struct Connection* con = 0;
193 assert(!from || cli_verify(from));
195 cptr = alloc_client();
198 assert(!cli_magic(cptr));
199 assert(0 == from || 0 != cli_connect(from));
201 if (!from) { /* local client, allocate a struct Connection */
202 con = alloc_connection();
205 assert(!con_magic(con));
207 con_magic(con) = CONNECTION_MAGIC;
208 con_fd(con) = -1; /* initialize struct Connection */
209 con_freeflag(con) = 0;
210 con_nextnick(con) = CurrentTime - NICK_DELAY;
211 con_nexttarget(con) = CurrentTime - (TARGET_DELAY * (STARTTARGETS - 1));
212 con_handler(con) = UNREGISTERED_HANDLER;
213 con_client(con) = cptr;
215 cli_local(cptr) = 1; /* Set certain fields of the struct Client */
216 cli_since(cptr) = cli_lasttime(cptr) = cli_firsttime(cptr) = CurrentTime;
217 cli_lastnick(cptr) = TStime();
219 con = cli_connect(from); /* use 'from's connection */
222 assert(con_verify(con));
224 cli_magic(cptr) = CLIENT_MAGIC;
225 cli_connect(cptr) = con; /* set the connection and other fields */
226 cli_status(cptr) = status;
227 cli_hnext(cptr) = cptr;
228 strcpy(cli_username(cptr), "unknown");
233 void free_connection(struct Connection* con)
238 assert(con_verify(con));
239 assert(0 == con_client(con));
241 dealloc_connection(con); /* deallocate the connection */
244 void free_client(struct Client* cptr)
249 * forget to remove the client from the hash table?
251 assert(cli_verify(cptr));
252 assert(cli_hnext(cptr) == cptr);
253 /* or from linked list? */
254 assert(cli_next(cptr) == 0);
255 assert(cli_prev(cptr) == 0);
257 Debug((DEBUG_LIST, "Freeing client %s [%p], connection %p", cli_name(cptr),
258 cptr, cli_connect(cptr)));
261 destroy_auth_request(cli_auth(cptr), 0);
263 /* Make sure we didn't magically get re-added to the list */
264 assert(cli_next(cptr) == 0);
265 assert(cli_prev(cptr) == 0);
267 if (cli_from(cptr) == cptr) { /* in other words, we're local */
269 /* timer must be marked as not active */
270 if (!cli_freeflag(cptr) && !t_active(&(cli_proc(cptr))))
271 dealloc_connection(cli_connect(cptr)); /* connection not open anymore */
273 if (-1 < cli_fd(cptr) && cli_freeflag(cptr) & FREEFLAG_SOCKET)
274 socket_del(&(cli_socket(cptr))); /* queue a socket delete */
275 if (cli_freeflag(cptr) & FREEFLAG_TIMER)
276 timer_del(&(cli_proc(cptr))); /* queue a timer delete */
280 cli_connect(cptr) = 0;
282 dealloc_client(cptr); /* actually destroy the client */
285 struct Server *make_server(struct Client *cptr)
287 struct Server *serv = cli_serv(cptr);
289 assert(cli_verify(cptr));
293 serv = (struct Server*) MyMalloc(sizeof(struct Server));
295 memset(serv, 0, sizeof(struct Server)); /* All variables are 0 by default */
299 cli_serv(cptr) = serv;
300 cli_serv(cptr)->lag = 60000;
302 DupString(serv->last_error_msg, "<>"); /* String must be non-empty */
304 return cli_serv(cptr);
308 * Taken the code from ExitOneClient() for this and placed it here.
311 void remove_client_from_list(struct Client *cptr)
313 assert(cli_verify(cptr));
314 assert(con_verify(cli_connect(cptr)));
315 assert(!cli_prev(cptr) || cli_verify(cli_prev(cptr)));
316 assert(!cli_next(cptr) || cli_verify(cli_next(cptr)));
319 /* Only try remove cptr from the list if it IS in the list.
320 * cli_next(cptr) cannot be NULL here, as &me is always the end
321 * the list, and we never remove &me. -GW
326 cli_next(cli_prev(cptr)) = cli_next(cptr);
328 GlobalClientList = cli_next(cptr);
329 cli_prev(GlobalClientList) = 0;
331 cli_prev(cli_next(cptr)) = cli_prev(cptr);
333 cli_next(cptr) = cli_prev(cptr) = 0;
335 if (IsUser(cptr) && cli_user(cptr)) {
336 add_history(cptr, 0);
339 if (cli_user(cptr)) {
340 free_user(cli_user(cptr));
344 if (cli_serv(cptr)) {
345 if (cli_serv(cptr)->user) {
346 free_user(cli_serv(cptr)->user);
347 cli_serv(cptr)->user = 0;
349 if (cli_serv(cptr)->client_list)
350 MyFree(cli_serv(cptr)->client_list);
351 MyFree(cli_serv(cptr)->last_error_msg);
352 MyFree(cli_serv(cptr));
361 * Although only a small routine, it appears in a number of places
362 * as a collection of a few lines...functions like this *should* be
363 * in this file, shouldnt they ? after all, this is list.c, isn't it ?
366 void add_client_to_list(struct Client *cptr)
368 assert(cli_verify(cptr));
369 assert(cli_next(cptr) == 0);
370 assert(cli_prev(cptr) == 0);
373 * Since we always insert new clients to the top of the list,
374 * this should mean the "me" is the bottom most item in the list.
375 * XXX - don't always count on the above, things change
378 cli_next(cptr) = GlobalClientList;
379 GlobalClientList = cptr;
381 cli_prev(cli_next(cptr)) = cptr;
385 /* WARNING: Major CPU sink!
387 * This is a debugging routine meant to verify the integrity of the client
388 * linked list. It is meant to be comprehensive, to detect *any* corruption
389 * of that list. This means that it will be majorly CPU-intensive, and
390 * should *only* be enabled on servers that have DEBUGMODE enabled. Ignore
391 * this warning at your peril!
393 void verify_client_list(void)
395 struct Client *client, *prev = 0, *sentinel = 0;
396 extern unsigned int ircrandom(void);
398 for (client = GlobalClientList; client; client = cli_next(client)) {
399 /* Verify that this is a valid client, not a free'd one */
400 assert(cli_verify(client));
401 /* Verify that the list hasn't suddenly jumped around */
402 assert(cli_prev(client) == prev);
403 /* Verify that the list hasn't become circular */
404 assert(cli_next(client) != GlobalClientList);
405 assert(!sentinel || client != sentinel);
407 prev = client; /* Remember what should preceed us */
408 if (!(ircrandom() % 50)) /* probabilistic loop detector */
412 #endif /* DEBUGMODE */
415 * Look for ptr in the linked listed pointed to by link.
417 struct SLink *find_user_link(struct SLink *lp, struct Client *ptr)
421 if (lp->value.cptr == ptr)
429 struct SLink* make_link(void)
431 struct SLink* lp = slinkFreeList;
433 slinkFreeList = lp->next;
435 lp = (struct SLink*) MyMalloc(sizeof(struct SLink));
445 void free_link(struct SLink* lp)
448 lp->next = slinkFreeList;
456 struct DLink *add_dlink(struct DLink **lpp, struct Client *cp)
458 struct DLink* lp = (struct DLink*) MyMalloc(sizeof(struct DLink));
462 if ((lp->next = *lpp))
468 void remove_dlink(struct DLink **lpp, struct DLink *lp)
474 if ((lp->prev->next = lp->next))
475 lp->next->prev = lp->prev;
477 else if ((*lpp = lp->next))
478 lp->next->prev = NULL;
483 void send_listinfo(struct Client *cptr, char *name)
485 int inuse = 0, mem = 0, tmp = 0;
487 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Clients: inuse: %d(%d)",
488 clients.inuse, tmp = clients.inuse * sizeof(struct Client));
490 inuse += clients.inuse;
491 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, "Connections: inuse: %d(%d)",
493 tmp = connections.inuse * sizeof(struct Connection));
495 inuse += connections.inuse;
496 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Users: inuse: %d(%d)",
497 users.inuse, tmp = users.inuse * sizeof(struct User));
499 inuse += users.inuse;
500 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Servs: inuse: %d(%d)",
501 servs.inuse, tmp = servs.inuse * sizeof(struct Server));
503 inuse += servs.inuse;
504 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Links: inuse: %d(%d)",
505 links.inuse, tmp = links.inuse * sizeof(struct SLink));
507 inuse += links.inuse;
508 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Confs: inuse: %d(%d)",
509 GlobalConfCount, tmp = GlobalConfCount * sizeof(struct ConfItem));
511 inuse += GlobalConfCount;
512 send_reply(cptr, SND_EXPLICIT | RPL_STATSDEBUG, ":Totals: inuse %d %d",