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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"
/* $ModDesc: Provides channel mode +j (join flood protection) */
/** Holds settings and state associated with channel mode +j
*/
class joinfloodsettings
{
public:
int secs;
int joins;
time_t reset;
time_t unlocktime;
int counter;
bool locked;
joinfloodsettings(int b, int c) : secs(b), joins(c)
{
reset = ServerInstance->Time() + secs;
counter = 0;
locked = false;
};
void addjoin()
{
counter++;
if (ServerInstance->Time() > reset)
{
counter = 0;
reset = ServerInstance->Time() + secs;
}
}
bool shouldlock()
{
return (counter >= this->joins);
}
void clear()
{
counter = 0;
}
bool islocked()
{
if (locked)
{
if (ServerInstance->Time() > unlocktime)
{
locked = false;
return false;
}
else
{
return true;
}
}
return false;
}
void lock()
{
locked = true;
unlocktime = ServerInstance->Time() + 60;
}
};
/** Handles channel mode +j
*/
class JoinFlood : public ModeHandler
{
public:
SimpleExtItem<joinfloodsettings> ext;
JoinFlood(Module* Creator) : ModeHandler(Creator, "joinflood", 'j', PARAM_SETONLY, MODETYPE_CHANNEL),
ext("joinflood", Creator) { }
ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding)
{
if (adding)
{
char ndata[MAXBUF];
char* data = ndata;
strlcpy(ndata,parameter.c_str(),MAXBUF);
char* joins = data;
char* secs = NULL;
while (*data)
{
if (*data == ':')
{
*data = 0;
data++;
secs = data;
break;
}
else data++;
}
if (secs)
{
/* Set up the flood parameters for this channel */
int njoins = atoi(joins);
int nsecs = atoi(secs);
if ((njoins<1) || (nsecs<1))
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
parameter.clear();
return MODEACTION_DENY;
}
else
{
joinfloodsettings* f = ext.get(channel);
if (!f)
{
parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
f = new joinfloodsettings(nsecs, njoins);
ext.set(channel, f);
channel->SetModeParam('j', parameter);
return MODEACTION_ALLOW;
}
else
{
std::string cur_param = channel->GetModeParameter('j');
parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
if (cur_param == parameter)
{
// mode params match
return MODEACTION_DENY;
}
else
{
// new mode param, replace old with new
if ((nsecs > 0) && (njoins > 0))
{
f = new joinfloodsettings(nsecs, njoins);
ext.set(channel, f);
channel->SetModeParam('j', parameter);
return MODEACTION_ALLOW;
}
else
{
return MODEACTION_DENY;
}
}
}
}
}
else
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
return MODEACTION_DENY;
}
}
else
{
joinfloodsettings* f = ext.get(channel);
if (f)
{
ext.unset(channel);
channel->SetModeParam('j', "");
return MODEACTION_ALLOW;
}
}
return MODEACTION_DENY;
}
};
class ModuleJoinFlood : public Module
{
JoinFlood jf;
public:
ModuleJoinFlood()
: jf(this)
{
}
void init()
{
if (!ServerInstance->Modes->AddMode(&jf))
throw ModuleException("Could not add new modes!");
ServerInstance->Extensions.Register(&jf.ext);
Implementation eventlist[] = { I_OnUserPreJoin, I_OnUserJoin };
ServerInstance->Modules->Attach(eventlist, this, 2);
}
ModResult OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs, const std::string &keygiven)
{
if (chan)
{
joinfloodsettings *f = jf.ext.get(chan);
if (f && f->islocked())
{
user->WriteNumeric(609, "%s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick.c_str(),chan->name.c_str());
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
void OnUserJoin(Membership* memb, bool sync, bool created, CUList& excepts)
{
/* 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->addjoin();
if (f->shouldlock())
{
f->clear();
f->lock();
memb->chan->WriteChannelWithServ((char*)ServerInstance->Config->ServerName.c_str(), "NOTICE %s :This channel has been closed to new users for 60 seconds because there have been more than %d joins in %d seconds.", memb->chan->name.c_str(), f->joins, f->secs);
}
}
}
~ModuleJoinFlood()
{
}
Version GetVersion()
{
return Version("Provides channel mode +j (join flood protection)", VF_VENDOR);
}
};
MODULE_INIT(ModuleJoinFlood)
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