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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2006 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
/* $ModDesc: Connection throttle */
class ModuleConnFlood : public Module
{
private:
int seconds, timeout, boot_wait;
unsigned int conns;
unsigned int maxconns;
bool throttled;
time_t first;
std::string quitmsg;
public:
ModuleConnFlood()
: conns(0), throttled(false)
{
}
void init()
{
InitConf();
Implementation eventlist[] = { I_OnRehash, I_OnUserRegister };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
}
virtual Version GetVersion()
{
return Version("Connection throttle", VF_VENDOR);
}
void InitConf()
{
/* read configuration variables */
ConfigTag* tag = ServerInstance->Config->ConfValue("connflood");
/* throttle configuration */
seconds = tag->getInt("seconds");
maxconns = tag->getInt("maxconns");
timeout = tag->getInt("timeout");
quitmsg = tag->getString("quitmsg");
/* seconds to wait when the server just booted */
boot_wait = tag->getInt("bootwait");
first = ServerInstance->Time();
}
virtual ModResult OnUserRegister(LocalUser* user)
{
if (user->exempt)
return MOD_RES_PASSTHRU;
time_t next = ServerInstance->Time();
if ((ServerInstance->startup_time + boot_wait) > next)
return MOD_RES_PASSTHRU;
/* time difference between first and latest connection */
time_t tdiff = next - first;
/* increase connection count */
conns++;
if (throttled)
{
if (tdiff > seconds + timeout)
{
/* expire throttle */
throttled = false;
ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle deactivated");
return MOD_RES_PASSTHRU;
}
ServerInstance->Users->QuitUser(user, quitmsg);
return MOD_RES_DENY;
}
if (tdiff <= seconds)
{
if (conns >= maxconns)
{
throttled = true;
ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle activated");
ServerInstance->Users->QuitUser(user, quitmsg);
return MOD_RES_DENY;
}
}
else
{
conns = 1;
first = next;
}
return MOD_RES_PASSTHRU;
}
virtual void OnRehash(User* user)
{
InitConf();
}
};
MODULE_INIT(ModuleConnFlood)
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