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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2012 Shawn Smith <ShawnSmith0828@gmail.com>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2004, 2006 Craig Edwards <craigedwards@brainbox.cc>
* Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
*
* 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"
/** Handle channel mode +L
*/
class Redirect : public ParamMode<Redirect, LocalStringExt>
{
public:
Redirect(Module* Creator)
: ParamMode<Redirect, LocalStringExt>(Creator, "redirect", 'L') { }
ModeAction OnSet(User* source, Channel* channel, std::string& parameter)
{
if (IS_LOCAL(source))
{
if (!ServerInstance->IsChannel(parameter))
{
source->WriteNumeric(ERR_NOSUCHCHANNEL, parameter, "Invalid channel name");
return MODEACTION_DENY;
}
}
if (IS_LOCAL(source) && !source->IsOper())
{
Channel* c = ServerInstance->FindChan(parameter);
if (!c)
{
source->WriteNumeric(690, InspIRCd::Format("Target channel %s must exist to be set as a redirect.", parameter.c_str()));
return MODEACTION_DENY;
}
else if (c->GetPrefixValue(source) < OP_VALUE)
{
source->WriteNumeric(690, InspIRCd::Format("You must be opped on %s to set it as a redirect.", parameter.c_str()));
return MODEACTION_DENY;
}
}
/*
* 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 MODEACTION_ALLOW;
}
void SerializeParam(Channel* chan, const std::string* str, std::string& out)
{
out += *str;
}
};
/** Handles usermode +L to stop forced redirection and print an error.
*/
class AntiRedirect : public SimpleUserModeHandler
{
public:
AntiRedirect(Module* Creator) : SimpleUserModeHandler(Creator, "antiredirect", 'L')
{
if (!ServerInstance->Config->ConfValue("redirect")->getBool("antiredirect"))
DisableAutoRegister();
}
};
class ModuleRedirect : public Module
{
Redirect re;
AntiRedirect re_u;
ChanModeReference limitmode;
bool UseUsermode;
public:
ModuleRedirect()
: re(this)
, re_u(this)
, limitmode(this, "limit")
{
}
void init() CXX11_OVERRIDE
{
/* Setting this here so it isn't changable by rehasing the config later. */
UseUsermode = ServerInstance->Config->ConfValue("redirect")->getBool("antiredirect");
}
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
{
if (chan)
{
if (chan->IsModeSet(re) && chan->IsModeSet(limitmode))
{
if (chan->GetUserCounter() >= ConvToNum<size_t>(chan->GetModeParameter(limitmode)))
{
const std::string& channel = *re.ext.get(chan);
/* sometimes broken ulines can make circular or chained +L, avoid this */
Channel* destchan = ServerInstance->FindChan(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;
}
/* We check the bool value here to make sure we have it enabled, if we don't then
usermode +L might be assigned to something else. */
if (UseUsermode && user->IsModeSet(re_u))
{
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 redirect channel.");
Channel::JoinUser(user, channel);
return MOD_RES_DENY;
}
}
}
}
return MOD_RES_PASSTHRU;
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Provides channel mode +L (limit redirection) and user mode +L (no forced redirection)", VF_VENDOR);
}
};
MODULE_INIT(ModuleRedirect)
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