/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2011 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"

/* $ModDesc: Connection throttle */

int conns = 0, throttled = 0;

class ModuleConnFlood : public Module
{
private:
	int seconds, maxconns, timeout, boot_wait;
	time_t first;
	std::string quitmsg;

public:
	void init()
	{
		Implementation eventlist[] = { I_OnUserRegister };
		ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
	}

	virtual ~ModuleConnFlood()
	{
	}

	virtual Version GetVersion()
	{
		return Version("Connection throttle", VF_VENDOR);
	}

	void ReadConfig(ConfigReadStatus&)
	{
		ConfigTag* tag = ServerInstance->Config->GetTag("connflood");
		/* read configuration variables */
		/* 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();
	}

	void OnUserRegister(LocalUser* user)
	{
		time_t next = ServerInstance->Time();

		if ((ServerInstance->startup_time + boot_wait) > next)
			return;

		/* time difference between first and latest connection */
		time_t tdiff = next - first;

		/* increase connection count */
		conns++;

		if (throttled == 1)
		{
			if (tdiff > seconds + timeout)
			{
				/* expire throttle */
				throttled = 0;
				ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle deactivated");
				return;
			}

			ServerInstance->Users->QuitUser(user, quitmsg);
			return;
		}

		if (tdiff <= seconds)
		{
			if (conns >= maxconns)
			{
				throttled = 1;
				ServerInstance->SNO->WriteGlobalSno('a', "Connection throttle activated");
				ServerInstance->Users->QuitUser(user, quitmsg);
			}
		}
		else
		{
			conns = 1;
			first = next;
		}
	}

};

MODULE_INIT(ModuleConnFlood)