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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 1997 Jukka Santala (Donwulff)
* Copyright (c) 2005-2014 ircd-hybrid 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
*/
/*! \file watch.c
* \brief File including functions for WATCH support
* \version $Id$
*/
#include "stdinc.h"
#include "list.h"
#include "client.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "conf.h"
#include "send.h"
#include "mempool.h"
#include "watch.h"
static dlink_list watchTable[HASHSIZE];
static mp_pool_t *watch_pool = NULL;
/*! \brief Initializes the watch table
*/
void
watch_init(void)
{
watch_pool = mp_pool_new(sizeof(struct Watch), MP_CHUNK_SIZE_WATCH);
}
/*
* Rough figure of the datastructures for watch:
*
* NOTIFY HASH client_p1
* | |- nick1
* nick1-|- client_p1 |- nick2
* | |- client_p2 client_p3
* | |- client_p3 client_p2 |- nick1
* | |- nick1
* nick2-|- client_p2 |- nick2
* |- client_p1
*/
/*! \brief Counts up memory used by watch list headers
*/
void
watch_count_memory(unsigned int *const count, uint64_t *const bytes)
{
unsigned int idx = 0;
for (; idx < HASHSIZE; ++idx)
(*count) += dlink_list_length(&watchTable[idx]);
(*bytes) = *count * sizeof(struct Watch);
}
/*! \brief Notifies all clients that have client_p's nick name on
* their watch list.
* \param client_p Pointer to Client struct
* \param reply Numeric to send. Either RPL_LOGON or RPL_LOGOFF
*/
void
watch_check_hash(struct Client *client_p, const unsigned int reply)
{
struct Watch *anptr = NULL;
dlink_node *ptr = NULL;
assert(IsClient(client_p));
if ((anptr = watch_find_hash(client_p->name)) == NULL)
return; /* This nick isn't on watch */
/* Update the time of last change to item */
anptr->lasttime = CurrentTime;
/* Send notifies out to everybody on the list in header */
DLINK_FOREACH(ptr, anptr->watched_by.head)
{
struct Client *target_p = ptr->data;
sendto_one(target_p, form_str(reply),
me.name, target_p->name, client_p->name,
client_p->username, client_p->host,
anptr->lasttime, client_p->info);
}
}
/*! \brief Looks up the watch table for a given nick
* \param name Nick name to look up
*/
struct Watch *
watch_find_hash(const char *name)
{
dlink_node *ptr = NULL;
DLINK_FOREACH(ptr, watchTable[strhash(name)].head)
{
struct Watch *anptr = ptr->data;
if (!irccmp(anptr->nick, name))
return anptr;
}
return NULL;
}
/*! \brief Adds a watch entry to client_p's watch list
* \param nick Nick name to add
* \param client_p Pointer to Client struct
*/
void
watch_add_to_hash_table(const char *nick, struct Client *client_p)
{
struct Watch *anptr = NULL;
dlink_node *ptr = NULL;
/* If found NULL (no header for this nick), make one... */
if ((anptr = watch_find_hash(nick)) == NULL)
{
anptr = mp_pool_get(watch_pool);
memset(anptr, 0, sizeof(*anptr));
anptr->lasttime = CurrentTime;
strlcpy(anptr->nick, nick, sizeof(anptr->nick));
dlinkAdd(anptr, &anptr->node, &watchTable[strhash(anptr->nick)]);
}
else
{
/* Is this client already on the watch-list? */
ptr = dlinkFind(&anptr->watched_by, client_p);
}
if (ptr == NULL)
{
/* No it isn't, so add it in the bucket and client addint it */
dlinkAdd(client_p, make_dlink_node(), &anptr->watched_by);
dlinkAdd(anptr, make_dlink_node(), &client_p->localClient->watches);
}
}
/*! \brief Removes a single entry from client_p's watch list
* \param nick Nick name to remove
* \param client_p Pointer to Client struct
*/
void
watch_del_from_hash_table(const char *nick, struct Client *client_p)
{
struct Watch *anptr = NULL;
dlink_node *ptr = NULL;
if ((anptr = watch_find_hash(nick)) == NULL)
return; /* No header found for that nick. i.e. it's not being watched */
if ((ptr = dlinkFind(&anptr->watched_by, client_p)) == NULL)
return; /* This nick isn't being watched by client_p */
dlinkDelete(ptr, &anptr->watched_by);
free_dlink_node(ptr);
if ((ptr = dlinkFindDelete(&client_p->localClient->watches, anptr)))
free_dlink_node(ptr);
/* In case this header is now empty of notices, remove it */
if (anptr->watched_by.head == NULL)
{
assert(dlinkFind(&watchTable[strhash(anptr->nick)], anptr) != NULL);
dlinkDelete(&anptr->node, &watchTable[strhash(anptr->nick)]);
mp_pool_release(anptr);
}
}
/*! \brief Removes all entries from client_p's watch list
* and deletes headers that are no longer being watched.
* \param client_p Pointer to Client struct
*/
void
watch_del_watch_list(struct Client *client_p)
{
dlink_node *ptr = NULL, *ptr_next = NULL;
dlink_node *tmp = NULL;
DLINK_FOREACH_SAFE(ptr, ptr_next, client_p->localClient->watches.head)
{
struct Watch *anptr = ptr->data;
assert(anptr);
assert(dlinkFind(&anptr->watched_by, client_p) != NULL);
if ((tmp = dlinkFindDelete(&anptr->watched_by, client_p)))
free_dlink_node(tmp);
/* If this leaves a header without notifies, remove it. */
if (anptr->watched_by.head == NULL)
{
assert(dlinkFind(&watchTable[strhash(anptr->nick)], anptr) != NULL);
dlinkDelete(&anptr->node, &watchTable[strhash(anptr->nick)]);
mp_pool_release(anptr);
}
dlinkDelete(ptr, &client_p->localClient->watches);
free_dlink_node(ptr);
}
assert(client_p->localClient->watches.head == NULL);
assert(client_p->localClient->watches.tail == NULL);
}
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