/*
* charybdis: An advanced ircd.
* m_list_safelist.c: Version of /list that uses the safelist code.
*
* Copyright (c) 2006 William Pitcock <nenolod@nenolod.net>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $Id: m_list.c 3372 2007-04-03 10:18:07Z nenolod $
*/
#include "stdinc.h"
#include "channel.h"
#include "client.h"
#include "hash.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_serv.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
static rb_dlink_list safelisting_clients = { NULL, NULL, 0 };
static int _modinit(void);
static void _moddeinit(void);
static int m_list(struct Client *, struct Client *, int, const char **);
static int mo_list(struct Client *, struct Client *, int, const char **);
static void safelist_check_cliexit(hook_data_client_exit * hdata);
static void safelist_client_instantiate(struct Client *, struct ListClient *);
static void safelist_client_release(struct Client *);
static void safelist_one_channel(struct Client *source_p, struct Channel *chptr);
static void safelist_iterate_client(struct Client *source_p);
static void safelist_iterate_clients(void *unused);
static void safelist_channel_named(struct Client *source_p, const char *name);
struct Message list_msgtab = {
"LIST", 0, 0, 0, MFLG_SLOW,
{mg_unreg, {m_list, 0}, mg_ignore, mg_ignore, mg_ignore, {mo_list, 0}}
};
mapi_clist_av1 list_clist[] = { &list_msgtab, NULL };
mapi_hfn_list_av1 list_hfnlist[] = {
{"client_exit", (hookfn) safelist_check_cliexit},
{NULL, NULL}
};
DECLARE_MODULE_AV1(list, _modinit, _moddeinit, list_clist, NULL, list_hfnlist, "$Revision: 3372 $");
static struct ev_entry *iterate_clients_ev = NULL;
static int _modinit(void)
{
iterate_clients_ev = rb_event_add("safelist_iterate_clients", safelist_iterate_clients, NULL, 3);
return 0;
}
static void _moddeinit(void)
{
rb_event_delete(iterate_clients_ev);
}
static void safelist_check_cliexit(hook_data_client_exit * hdata)
{
/* Cancel the safelist request if we are disconnecting
* from the server. That way it doesn't core. :P --nenolod
*/
if (MyClient(hdata->target) && hdata->target->localClient->safelist_data != NULL)
{
safelist_client_release(hdata->target);
}
}
/* m_list()
* parv[0] = sender prefix
* parv[1] = channel
*
* XXX - With SAFELIST, do we really need to continue pacing?
* In theory, the server cannot be lagged by this. --nenolod
*/
static int m_list(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
static time_t last_used = 0L;
if (source_p->localClient->safelist_data != NULL)
{
sendto_one_notice(source_p, ":/LIST aborted");
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
safelist_client_release(source_p);
return 0;
}
if (parc < 2 || !IsChannelName(parv[1]))
{
/* pace this due to the sheer traffic involved */
if (((last_used + ConfigFileEntry.pace_wait) > rb_current_time()))
{
sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, source_p->name, "LIST");
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
return 0;
}
else
last_used = rb_current_time();
}
return mo_list(client_p, source_p, parc, parv);
}
/* mo_list()
* parv[0] = sender prefix
* parv[1] = channel
*/
static int mo_list(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct ListClient params;
char *p, *args;
int i;
if (source_p->localClient->safelist_data != NULL)
{
sendto_one_notice(source_p, ":/LIST aborted");
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
safelist_client_release(source_p);
return 0;
}
/* XXX rather arbitrary -- jilles */
params.users_min = 3;
params.users_max = INT_MAX;
if (parc > 1 && parv[1] != NULL && !IsChannelName(parv[1]))
{
args = LOCAL_COPY(parv[1]);
/* Make any specification cancel out defaults */
if (*args == '<')
params.users_min = 0;
for (i = 0; i < 2; i++)
{
if ((p = strchr(args, ',')) != NULL)
*p++ = '\0';
if (*args == '<')
{
args++;
if (IsDigit(*args))
{
params.users_max = atoi(args);
if (params.users_max == 0)
params.users_max = INT_MAX;
else
params.users_max--;
}
else
params.users_max = INT_MAX;
}
else if (*args == '>')
{
args++;
if (IsDigit(*args))
params.users_min = atoi(args) + 1;
else
params.users_min = 0;
}
if (EmptyString(p))
break;
else
args = p;
}
}
else if (parc > 1 && IsChannelName(parv[1]))
{
safelist_channel_named(source_p, parv[1]);
return 0;
}
safelist_client_instantiate(source_p, ¶ms);
return 0;
}
/*
* safelist_sendq_exceeded()
*
* inputs - pointer to client that needs checking
* outputs - 1 if a client has exceeded the reserved
* sendq limit, 0 if not
* side effects - none
*
* When safelisting, we only use half of the SendQ at any
* given time.
*/
static int safelist_sendq_exceeded(struct Client *client_p)
{
if (rb_linebuf_len(&client_p->localClient->buf_sendq) > (get_sendq(client_p) / 2))
return YES;
else
return NO;
}
/*
* safelist_client_instantiate()
*
* inputs - pointer to Client to be listed,
* struct ListClient to copy for params
* outputs - none
* side effects - the safelist process begins for a
* client.
*
* Please do not ever call this on a non-local client.
* If you do, you will get SIGSEGV.
*/
static void safelist_client_instantiate(struct Client *client_p, struct ListClient *params)
{
struct ListClient *self;
s_assert(MyClient(client_p));
s_assert(params != NULL);
self = rb_malloc(sizeof(struct ListClient));
self->hash_indice = 0;
self->users_min = params->users_min;
self->users_max = params->users_max;
client_p->localClient->safelist_data = self;
sendto_one(client_p, form_str(RPL_LISTSTART), me.name, client_p->name);
/* pop the client onto the queue for processing */
rb_dlinkAddAlloc(client_p, &safelisting_clients);
/* give the user some initial data to work with */
safelist_iterate_client(client_p);
}
/*
* safelist_client_release()
*
* inputs - pointer to Client being listed on
* outputs - none
* side effects - the client is no longer being
* listed
*
* Please do not ever call this on a non-local client.
* If you do, you will get SIGSEGV.
*/
static void safelist_client_release(struct Client *client_p)
{
s_assert(MyClient(client_p));
rb_dlinkFindDestroy(client_p, &safelisting_clients);
rb_free(client_p->localClient->safelist_data);
client_p->localClient->safelist_data = NULL;
sendto_one(client_p, form_str(RPL_LISTEND), me.name, client_p->name);
}
/*
* safelist_channel_named()
*
* inputs - client pointer, channel name
* outputs - none
* side effects - a named channel is listed
*/
static void safelist_channel_named(struct Client *source_p, const char *name)
{
struct Channel *chptr;
char *p;
char *n = LOCAL_COPY(name);
sendto_one(source_p, form_str(RPL_LISTSTART), me.name, source_p->name);
if ((p = strchr(n, ',')))
*p = '\0';
if (*n == '\0')
{
sendto_one_numeric(source_p, ERR_NOSUCHNICK, form_str(ERR_NOSUCHNICK), name);
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
return;
}
chptr = find_channel(n);
if (chptr == NULL)
{
sendto_one_numeric(source_p, ERR_NOSUCHNICK, form_str(ERR_NOSUCHNICK), n);
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
return;
}
if (ShowChannel(source_p, chptr))
sendto_one(source_p, form_str(RPL_LIST), me.name, source_p->name, chptr->chname,
rb_dlink_list_length(&chptr->members),
chptr->topic == NULL ? "" : chptr->topic);
sendto_one(source_p, form_str(RPL_LISTEND), me.name, source_p->name);
return;
}
/*
* safelist_one_channel()
*
* inputs - client pointer and channel pointer
* outputs - none
* side effects - a channel is listed if it meets the
* requirements
*/
static void safelist_one_channel(struct Client *source_p, struct Channel *chptr)
{
struct ListClient *safelist_data = source_p->localClient->safelist_data;
if (SecretChannel(chptr) && !IsMember(source_p, chptr))
return;
if ((unsigned int)chptr->members.length < safelist_data->users_min
|| (unsigned int)chptr->members.length > safelist_data->users_max)
return;
sendto_one(source_p, form_str(RPL_LIST), me.name, source_p->name, chptr->chname,
chptr->members.length, chptr->topic == NULL ? "" : chptr->topic);
}
/*
* safelist_iterate_client()
*
* inputs - client pointer
* outputs - none
* side effects - the client's sendq is filled up again
*/
static void safelist_iterate_client(struct Client *source_p)
{
rb_dlink_node *ptr;
int iter;
for (iter = source_p->localClient->safelist_data->hash_indice; iter < CH_MAX; iter++)
{
if (safelist_sendq_exceeded(source_p->from) == YES)
{
source_p->localClient->safelist_data->hash_indice = iter;
return;
}
RB_DLINK_FOREACH(ptr, channelTable[iter].head)
safelist_one_channel(source_p, (struct Channel *) ptr->data);
}
safelist_client_release(source_p);
}
static void safelist_iterate_clients(void *unused)
{
rb_dlink_node *n, *n2;
RB_DLINK_FOREACH_SAFE(n, n2, safelisting_clients.head)
safelist_iterate_client((struct Client *)n->data);
}