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construct/ircd/scache.cc
2016-08-13 02:43:42 -07:00

217 lines
5.4 KiB
C++

/*
* charybdis
* scache.c: Server names cache.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <ircd/stdinc.h>
#include <ircd/client.h>
#include <ircd/match.h>
#include <ircd/ircd.h>
#include <ircd/numeric.h>
#include <ircd/send.h>
#include <ircd/scache.h>
#include <ircd/s_conf.h>
#include <ircd/s_assert.h>
namespace ircd {
/*
* ircd used to store full servernames in anUser as well as in the
* whowas info. there can be some 40k such structures alive at any
* given time, while the number of unique server names a server sees
* in its lifetime is at most a few hundred. by tokenizing server
* names internally, the server can easily save 2 or 3 megs of RAM.
* -orabidoo
*
* reworked to serve for flattening/delaying /links also
* -- jilles
*
* reworked to make use of rb_radixtree.
* -- kaniini
*/
#define SC_ONLINE 1
#define SC_HIDDEN 2
struct scache_entry
{
char name[HOSTLEN + 1];
char info[REALLEN + 1];
int flags;
time_t known_since;
time_t last_connect;
time_t last_split;
};
static rb_radixtree *scache_tree = NULL;
void
clear_scache_hash_table(void)
{
scache_tree = rb_radixtree_create("server names cache", irccasecanon);
}
static struct scache_entry *
find_or_add(const char *name)
{
struct scache_entry *ptr;
ptr = (scache_entry *)rb_radixtree_retrieve(scache_tree, name);
if (ptr != NULL)
return ptr;
ptr = (struct scache_entry *) rb_malloc(sizeof(struct scache_entry));
s_assert(0 != ptr);
rb_strlcpy(ptr->name, name, sizeof(ptr->name));
ptr->info[0] = '\0';
ptr->flags = 0;
ptr->known_since = rb_current_time();
ptr->last_connect = 0;
ptr->last_split = 0;
rb_radixtree_add(scache_tree, ptr->name, ptr);
return ptr;
}
struct scache_entry *
scache_connect(const char *name, const char *info, int hidden)
{
struct scache_entry *ptr;
ptr = find_or_add(name);
rb_strlcpy(ptr->info, info, sizeof(ptr->info));
ptr->flags |= SC_ONLINE;
if (hidden)
ptr->flags |= SC_HIDDEN;
else
ptr->flags &= ~SC_HIDDEN;
ptr->last_connect = rb_current_time();
return ptr;
}
void
scache_split(struct scache_entry *ptr)
{
if (ptr == NULL)
return;
ptr->flags &= ~SC_ONLINE;
ptr->last_split = rb_current_time();
}
const char *scache_get_name(struct scache_entry *ptr)
{
return ptr->name;
}
/* scache_send_flattened_links()
*
* inputs - client to send to
* outputs - the cached links, us, and RPL_ENDOFLINKS
* side effects -
*/
void
scache_send_flattened_links(struct Client *source_p)
{
struct scache_entry *scache_ptr;
rb_radixtree_iteration_state iter;
int show;
void *elem;
RB_RADIXTREE_FOREACH(elem, &iter, scache_tree)
{
scache_ptr = (scache_entry *)elem;
if (!irccmp(scache_ptr->name, me.name))
show = FALSE;
else if (scache_ptr->flags & SC_HIDDEN &&
!ConfigServerHide.disable_hidden)
show = FALSE;
else if (scache_ptr->flags & SC_ONLINE)
show = scache_ptr->known_since < rb_current_time() - ConfigServerHide.links_delay;
else
show = scache_ptr->last_split > rb_current_time() - ConfigServerHide.links_delay && scache_ptr->last_split - scache_ptr->known_since > ConfigServerHide.links_delay;
if (show)
sendto_one_numeric(source_p, RPL_LINKS, form_str(RPL_LINKS),
scache_ptr->name, me.name, 1, scache_ptr->info);
}
sendto_one_numeric(source_p, RPL_LINKS, form_str(RPL_LINKS),
me.name, me.name, 0, me.info);
sendto_one_numeric(source_p, RPL_ENDOFLINKS, form_str(RPL_ENDOFLINKS), "*");
}
#define MISSING_TIMEOUT 86400
/* scache_send_missing()
*
* inputs - client to send to
* outputs - recently split servers
* side effects -
*/
void
scache_send_missing(struct Client *source_p)
{
struct scache_entry *scache_ptr;
rb_radixtree_iteration_state iter;
void *elem;
RB_RADIXTREE_FOREACH(elem, &iter, scache_tree)
{
scache_ptr = (scache_entry *)elem;
if (!(scache_ptr->flags & SC_ONLINE) && scache_ptr->last_split > rb_current_time() - MISSING_TIMEOUT)
sendto_one_numeric(source_p, RPL_MAP, "** %s (recently split)",
scache_ptr->name);
}
}
/*
* count_scache
* inputs - pointer to where to leave number of servers cached
* - pointer to where to leave total memory usage
* output - NONE
* side effects -
*/
void
count_scache(size_t * number_servers_cached, size_t * mem_servers_cached)
{
struct scache_entry *scache_ptr;
rb_radixtree_iteration_state iter;
*number_servers_cached = 0;
*mem_servers_cached = 0;
void *elem;
RB_RADIXTREE_FOREACH(elem, &iter, scache_tree)
{
scache_ptr = (scache_entry *)elem;
*number_servers_cached = *number_servers_cached + 1;
*mem_servers_cached = *mem_servers_cached +
sizeof(struct scache_entry);
}
}
} // namespace ircd