solanum/ircd/whowas.c

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/*
* ircd-ratbox: A slightly useful ircd.
* whowas.c: WHOWAS user cache.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2012 ircd-ratbox development team
* Copyright (C) 2016 Ariadne Conill <ariadne@dereferenced.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "stdinc.h"
#include "hash.h"
#include "whowas.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "s_assert.h"
#include "s_serv.h"
#include "s_user.h"
#include "send.h"
#include "s_conf.h"
#include "client.h"
#include "send.h"
#include "logger.h"
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#include "scache.h"
#include "rb_radixtree.h"
struct whowas_top
{
char *name;
rb_dlink_list wwlist;
};
static rb_radixtree *whowas_tree = NULL;
static rb_dlink_list whowas_list = {NULL, NULL, 0};
static unsigned int whowas_list_length = NICKNAMEHISTORYLENGTH;
static void whowas_trim(void *unused);
static void
whowas_free_wtop(struct whowas_top *wtop)
{
if(rb_dlink_list_length(&wtop->wwlist) == 0)
{
rb_radixtree_delete(whowas_tree, wtop->name);
rb_free(wtop->name);
rb_free(wtop);
}
}
static struct whowas_top *
whowas_get_top(const char *name)
{
struct whowas_top *wtop;
wtop = rb_radixtree_retrieve(whowas_tree, name);
if (wtop != NULL)
return wtop;
wtop = rb_malloc(sizeof(struct whowas_top));
wtop->name = rb_strdup(name);
rb_radixtree_add(whowas_tree, wtop->name, wtop);
return wtop;
}
rb_dlink_list *
whowas_get_list(const char *name)
{
struct whowas_top *wtop;
wtop = rb_radixtree_retrieve(whowas_tree, name);
if(wtop == NULL)
return NULL;
return &wtop->wwlist;
}
void
whowas_add_history(struct Client *client_p, int online)
{
struct whowas_top *wtop;
struct Whowas *who;
s_assert(NULL != client_p);
if(client_p == NULL)
return;
/* trim some of the entries if we're getting well over our history length */
if(rb_dlink_list_length(&whowas_list) > whowas_list_length + 100)
whowas_trim(NULL);
wtop = whowas_get_top(client_p->name);
who = rb_malloc(sizeof(struct Whowas));
who->wtop = wtop;
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who->logoff = rb_current_time();
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rb_strlcpy(who->name, client_p->name, sizeof(who->name));
rb_strlcpy(who->username, client_p->username, sizeof(who->username));
rb_strlcpy(who->hostname, client_p->host, sizeof(who->hostname));
rb_strlcpy(who->realname, client_p->info, sizeof(who->realname));
rb_strlcpy(who->sockhost, client_p->sockhost, sizeof(who->sockhost));
rb_strlcpy(who->suser, client_p->user->suser, sizeof(who->suser));
who->flags = (IsIPSpoof(client_p) ? WHOWAS_IP_SPOOFING : 0) |
(IsDynSpoof(client_p) ? WHOWAS_DYNSPOOF : 0);
/* this is safe do to with the servername cache */
who->servername = scache_get_name(client_p->servptr->serv->nameinfo);
if(online)
{
who->online = client_p;
rb_dlinkAdd(who, &who->cnode, &client_p->whowas_clist);
}
else
who->online = NULL;
rb_dlinkAdd(who, &who->wnode, &wtop->wwlist);
rb_dlinkAdd(who, &who->whowas_node, &whowas_list);
}
void
whowas_off_history(struct Client *client_p)
{
rb_dlink_node *ptr, *next;
RB_DLINK_FOREACH_SAFE(ptr, next, client_p->whowas_clist.head)
{
struct Whowas *who = ptr->data;
who->online = NULL;
rb_dlinkDelete(&who->cnode, &client_p->whowas_clist);
}
}
struct Client *
whowas_get_history(const char *nick, time_t timelimit)
{
struct whowas_top *wtop;
rb_dlink_node *ptr;
wtop = rb_radixtree_retrieve(whowas_tree, nick);
if(wtop == NULL)
return NULL;
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timelimit = rb_current_time() - timelimit;
RB_DLINK_FOREACH_PREV(ptr, wtop->wwlist.tail)
{
struct Whowas *who = ptr->data;
if(who->logoff >= timelimit)
{
return who->online;
}
}
return NULL;
}
static void
whowas_trim(void *unused)
{
long over;
if(rb_dlink_list_length(&whowas_list) < whowas_list_length)
return;
over = rb_dlink_list_length(&whowas_list) - whowas_list_length;
/* remove whowas entries over the configured length */
for(long i = 0; i < over; i++)
{
if(whowas_list.tail != NULL && whowas_list.tail->data != NULL)
{
struct Whowas *twho = whowas_list.tail->data;
if(twho->online != NULL)
rb_dlinkDelete(&twho->cnode, &twho->online->whowas_clist);
rb_dlinkDelete(&twho->wnode, &twho->wtop->wwlist);
rb_dlinkDelete(&twho->whowas_node, &whowas_list);
whowas_free_wtop(twho->wtop);
rb_free(twho);
}
}
}
void
whowas_init(void)
{
whowas_tree = rb_radixtree_create("whowas", irccasecanon);
if(whowas_list_length == 0)
{
whowas_list_length = NICKNAMEHISTORYLENGTH;
}
rb_event_add("whowas_trim", whowas_trim, NULL, 10);
}
void
whowas_set_size(int len)
{
whowas_list_length = len;
whowas_trim(NULL);
}
void
whowas_memory_usage(size_t * count, size_t * memused)
{
*count = rb_dlink_list_length(&whowas_list);
*memused += *count * sizeof(struct Whowas);
*memused += sizeof(struct whowas_top) * rb_radixtree_size(whowas_tree);
}