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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2018-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2013 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006-2007, 2010 Craig Edwards <brain@inspircd.org>
*
* 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"
class ModuleConnFlood : public Module
{
private:
unsigned int seconds;
unsigned int timeout;
unsigned int boot_wait;
unsigned int conns;
unsigned int maxconns;
bool throttled;
time_t first;
std::string quitmsg;
static bool IsExempt(LocalUser* user)
{
// E-lined and already banned users shouldn't be hit.
if (user->exempt || user->quitting)
return true;
// Users in an exempt class shouldn't be hit.
return user->GetClass() && !user->GetClass()->config->getBool("useconnflood", true);
}
public:
ModuleConnFlood()
: conns(0), throttled(false)
{
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Throttles excessive connections to the server.", VF_VENDOR);
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
/* read configuration variables */
ConfigTag* tag = ServerInstance->Config->ConfValue("connflood");
/* throttle configuration */
seconds = tag->getDuration("period", tag->getDuration("seconds", 30));
maxconns = tag->getUInt("maxconns", 3);
timeout = tag->getDuration("timeout", 30);
quitmsg = tag->getString("quitmsg");
/* seconds to wait when the server just booted */
boot_wait = tag->getDuration("bootwait", 60*2);
first = ServerInstance->Time();
}
ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
{
if (IsExempt(user))
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;
}
};
MODULE_INIT(ModuleConnFlood)
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