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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2019-2023 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2017 B00mX0r <b00mx0r@aureus.pw>
* Copyright (C) 2012-2014, 2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2012, 2014 Shawn Smith <ShawnSmith0828@gmail.com>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2006 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"
#include "extension.h"
#include "numerichelper.h"
/** Handle channel mode +L
*/
class Redirect final
: public ParamMode<Redirect, StringExtItem>
{
public:
Redirect(Module* Creator)
: ParamMode<Redirect, StringExtItem>(Creator, "redirect", 'L')
{
syntax = "<target>";
}
bool OnSet(User* source, Channel* channel, std::string& parameter) override
{
if (IS_LOCAL(source))
{
if (!ServerInstance->Channels.IsChannel(parameter))
{
source->WriteNumeric(Numerics::NoSuchChannel(parameter));
return false;
}
}
if (IS_LOCAL(source) && !source->IsOper())
{
auto* c = ServerInstance->Channels.Find(parameter);
if (!c)
{
source->WriteNumeric(690, FMT::format("Target channel {} must exist to be set as a redirect.", parameter));
return false;
}
else if (c->GetPrefixValue(source) < OP_VALUE)
{
source->WriteNumeric(690, FMT::format("You must be opped on {} to set it as a redirect.", parameter));
return false;
}
}
/*
* We used to do some checking for circular +L here, but there is no real need for this any more especially as we
* now catch +L looping in PreJoin. Remove it, since O(n) logic makes me sad, and we catch it anyway. :) -- w00t
*/
ext.Set(channel, parameter);
return true;
}
void SerializeParam(Channel* chan, const std::string* str, std::string& out)
{
out += *str;
}
};
class ModuleRedirect final
: public Module
{
private:
Redirect re;
SimpleUserMode antiredirectmode;
ChanModeReference limitmode;
public:
ModuleRedirect()
: Module(VF_VENDOR, "Allows users to be redirected to another channel when the user limit is reached.")
, re(this)
, antiredirectmode(this, "antiredirect", 'L')
, limitmode(this, "limit")
{
}
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven, bool override) override
{
if (!override && chan)
{
if (chan->IsModeSet(re) && chan->IsModeSet(limitmode))
{
if (chan->GetUsers().size() >= ConvToNum<size_t>(chan->GetModeParameter(limitmode)))
{
const std::string& channel = *re.ext.Get(chan);
/* sometimes broken services can make circular or chained +L, avoid this */
auto* destchan = ServerInstance->Channels.Find(channel);
if (destchan && destchan->IsModeSet(re))
{
user->WriteNumeric(470, cname, '*', "You may not join this channel. A redirect is set, but you may not be redirected as it is a circular loop.");
return MOD_RES_DENY;
}
if (user->IsModeSet(antiredirectmode))
{
user->WriteNumeric(470, cname, channel, "Force redirection stopped.");
return MOD_RES_DENY;
}
else
{
user->WriteNumeric(470, cname, channel, "You may not join this channel, so you are automatically being transferred to the redirected channel.");
Channel::JoinUser(user, channel);
return MOD_RES_DENY;
}
}
}
}
return MOD_RES_PASSTHRU;
}
};
MODULE_INIT(ModuleRedirect)
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