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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2021 Dominic Hamon
* Copyright (C) 2018-2023 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 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 final
: public Module
{
private:
unsigned long seconds;
unsigned long timeout;
unsigned long boot_wait;
unsigned long conns = 0;
unsigned long maxconns;
bool throttled = false;
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()
: Module(VF_VENDOR, "Throttles excessive connections to the server.")
{
}
void ReadConfig(ConfigStatus& status) override
{
/* read configuration variables */
const auto& tag = ServerInstance->Config->ConfValue("connflood");
/* throttle configuration */
seconds = tag->getDuration("period", 30);
maxconns = tag->getNum<unsigned long>("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) override
{
if (IsExempt(user))
return MOD_RES_PASSTHRU;
time_t next = ServerInstance->Time();
if ((time_t)(ServerInstance->StartTime + boot_wait) > next)
return MOD_RES_PASSTHRU;
/* time difference between first and latest connection */
unsigned long 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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