/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
 *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2006-2007 Oliver Lupton <oliverlupton@gmail.com>
 *   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: Forces connecting clients to send a PONG message back to the server before they can complete their connection */

class ModuleWaitPong : public Module
{
	bool sendsnotice;
	bool killonbadreply;
	LocalStringExt ext;

 public:
	ModuleWaitPong()
	 : ext("waitpong_pingstr", this)
	{
	}

	void init() CXX11_OVERRIDE
	{
		ServerInstance->Modules->AddService(ext);
		OnRehash(NULL);
		Implementation eventlist[] = { I_OnUserRegister, I_OnCheckReady, I_OnPreCommand, I_OnRehash };
		ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
	}

	void OnRehash(User* user) CXX11_OVERRIDE
	{
		ConfigTag* tag = ServerInstance->Config->ConfValue("waitpong");
		sendsnotice = tag->getBool("sendsnotice", true);
		killonbadreply = tag->getBool("killonbadreply", true);
	}

	ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
	{
		std::string pingrpl = ServerInstance->GenRandomStr(10);

		user->Write("PING :%s", pingrpl.c_str());

		if(sendsnotice)
			user->WriteNotice("*** If you are having problems connecting due to ping timeouts, please type /quote PONG " + pingrpl + " or /raw PONG " + pingrpl + " now.");

		ext.set(user, pingrpl);
		return MOD_RES_PASSTHRU;
	}

	ModResult OnPreCommand(std::string &command, std::vector<std::string> &parameters, LocalUser* user, bool validated, const std::string &original_line) CXX11_OVERRIDE
	{
		if (command == "PONG")
		{
			std::string* pingrpl = ext.get(user);

			if (pingrpl)
			{
				if (!parameters.empty() && *pingrpl == parameters[0])
				{
					ext.unset(user);
					return MOD_RES_DENY;
				}
				else
				{
					if(killonbadreply)
						ServerInstance->Users->QuitUser(user, "Incorrect ping reply for registration");
					return MOD_RES_DENY;
				}
			}
		}
		return MOD_RES_PASSTHRU;
	}

	ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
	{
		return ext.get(user) ? MOD_RES_DENY : MOD_RES_PASSTHRU;
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Require pong prior to registration", VF_VENDOR);
	}
};

MODULE_INIT(ModuleWaitPong)
