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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2006-2007 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"
enum
{
// From RFC 2182.
ERR_UNAVAILRESOURCE = 437
};
// The number of seconds the channel will be closed for.
static unsigned int duration;
/** Holds settings and state associated with channel mode +j
*/
class joinfloodsettings
{
public:
unsigned int secs;
unsigned int joins;
time_t reset;
time_t unlocktime;
unsigned int counter;
joinfloodsettings(unsigned int b, unsigned int c)
: secs(b), joins(c), unlocktime(0), counter(0)
{
reset = ServerInstance->Time() + secs;
}
void addjoin()
{
if (ServerInstance->Time() > reset)
{
counter = 1;
reset = ServerInstance->Time() + secs;
}
else
counter++;
}
bool shouldlock()
{
return (counter >= this->joins);
}
void clear()
{
counter = 0;
}
bool islocked()
{
if (ServerInstance->Time() > unlocktime)
unlocktime = 0;
return (unlocktime != 0);
}
void lock()
{
unlocktime = ServerInstance->Time() + duration;
}
bool operator==(const joinfloodsettings& other) const
{
return ((this->secs == other.secs) && (this->joins == other.joins));
}
};
/** Handles channel mode +j
*/
class JoinFlood : public ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >
{
public:
JoinFlood(Module* Creator)
: ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >(Creator, "joinflood", 'j')
{
}
ModeAction OnSet(User* source, Channel* channel, std::string& parameter) CXX11_OVERRIDE
{
std::string::size_type colon = parameter.find(':');
if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
{
source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter));
return MODEACTION_DENY;
}
/* Set up the flood parameters for this channel */
unsigned int njoins = ConvToInt(parameter.substr(0, colon));
unsigned int nsecs = ConvToInt(parameter.substr(colon+1));
if ((njoins<1) || (nsecs<1))
{
source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter));
return MODEACTION_DENY;
}
ext.set(channel, new joinfloodsettings(nsecs, njoins));
return MODEACTION_ALLOW;
}
void SerializeParam(Channel* chan, const joinfloodsettings* jfs, std::string& out)
{
out.append(ConvToStr(jfs->joins)).push_back(':');
out.append(ConvToStr(jfs->secs));
}
};
class ModuleJoinFlood : public Module
{
JoinFlood jf;
public:
ModuleJoinFlood()
: jf(this)
{
}
void ReadConfig(ConfigStatus&) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("joinflood");
duration = tag->getDuration("duration", 60, 10, 600);
}
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
{
if (chan)
{
joinfloodsettings *f = jf.ext.get(chan);
if (f && f->islocked())
{
user->WriteNumeric(ERR_UNAVAILRESOURCE, chan->name, "This channel is temporarily unavailable (+j). Please try again later.");
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
void OnUserJoin(Membership* memb, bool sync, bool created, CUList& excepts) CXX11_OVERRIDE
{
/* We arent interested in JOIN events caused by a network burst */
if (sync)
return;
joinfloodsettings *f = jf.ext.get(memb->chan);
/* But all others are OK */
if ((f) && (!f->islocked()))
{
f->addjoin();
if (f->shouldlock())
{
f->clear();
f->lock();
memb->chan->WriteNotice(InspIRCd::Format("This channel has been closed to new users for %u seconds because there have been more than %d joins in %d seconds.", duration, f->joins, f->secs));
}
}
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Provides channel mode +j (join flood protection)", VF_VENDOR);
}
};
MODULE_INIT(ModuleJoinFlood)
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