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/*
* 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 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 John Brooks <john.brooks@dereferenced.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 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"
#include "modules/ctctags.h"
#include "modules/exemption.h"
/** Holds flood settings and state for mode +f
*/
class floodsettings
{
public:
bool ban;
unsigned int secs;
unsigned int lines;
time_t reset;
insp::flat_map<User*, unsigned int> counters;
floodsettings(bool a, unsigned int b, unsigned int c)
: ban(a)
, secs(b)
, lines(c)
{
reset = ServerInstance->Time() + secs;
}
bool addmessage(User* who)
{
if (ServerInstance->Time() > reset)
{
counters.clear();
reset = ServerInstance->Time() + secs;
}
return (++counters[who] >= this->lines);
}
void clear(User* who)
{
counters.erase(who);
}
};
/** Handles channel mode +f
*/
class MsgFlood : public ParamMode<MsgFlood, SimpleExtItem<floodsettings> >
{
public:
MsgFlood(Module* Creator)
: ParamMode<MsgFlood, SimpleExtItem<floodsettings> >(Creator, "flood", 'f')
{
}
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 */
bool ban = (parameter[0] == '*');
unsigned int nlines = ConvToNum<unsigned int>(parameter.substr(ban ? 1 : 0, ban ? colon-1 : colon));
unsigned int nsecs = ConvToNum<unsigned int>(parameter.substr(colon+1));
if ((nlines<2) || (nsecs<1))
{
source->WriteNumeric(Numerics::InvalidModeParameter(channel, this, parameter));
return MODEACTION_DENY;
}
ext.set(channel, new floodsettings(ban, nsecs, nlines));
return MODEACTION_ALLOW;
}
void SerializeParam(Channel* chan, const floodsettings* fs, std::string& out)
{
if (fs->ban)
out.push_back('*');
out.append(ConvToStr(fs->lines)).push_back(':');
out.append(ConvToStr(fs->secs));
}
};
class ModuleMsgFlood
: public Module
, public CTCTags::EventListener
{
private:
CheckExemption::EventProvider exemptionprov;
MsgFlood mf;
public:
ModuleMsgFlood()
: CTCTags::EventListener(this)
, exemptionprov(this)
, mf(this)
{
}
ModResult HandleMessage(User* user, const MessageTarget& target)
{
if (target.type != MessageTarget::TYPE_CHANNEL)
return MOD_RES_PASSTHRU;
Channel* dest = target.Get<Channel>();
if ((!IS_LOCAL(user)) || !dest->IsModeSet(mf))
return MOD_RES_PASSTHRU;
ModResult res = CheckExemption::Call(exemptionprov, user, dest, "flood");
if (res == MOD_RES_ALLOW)
return MOD_RES_PASSTHRU;
floodsettings *f = mf.ext.get(dest);
if (f)
{
if (f->addmessage(user))
{
/* Youre outttta here! */
f->clear(user);
if (f->ban)
{
Modes::ChangeList changelist;
changelist.push_add(ServerInstance->Modes->FindMode('b', MODETYPE_CHANNEL), "*!*@" + user->GetDisplayedHost());
ServerInstance->Modes->Process(ServerInstance->FakeClient, dest, NULL, changelist);
}
const std::string kickMessage = "Channel flood triggered (trigger is " + ConvToStr(f->lines) +
" lines in " + ConvToStr(f->secs) + " secs)";
dest->KickUser(ServerInstance->FakeClient, user, kickMessage);
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
{
return HandleMessage(user, target);
}
ModResult OnUserPreTagMessage(User* user, const MessageTarget& target, CTCTags::TagMessageDetails& details) CXX11_OVERRIDE
{
return HandleMessage(user, target);
}
void Prioritize() CXX11_OVERRIDE
{
// we want to be after all modules that might deny the message (e.g. m_muteban, m_noctcp, m_blockcolor, etc.)
ServerInstance->Modules->SetPriority(this, I_OnUserPreMessage, PRIORITY_LAST);
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Provides channel mode +f (message flood protection)", VF_VENDOR);
}
};
MODULE_INIT(ModuleMsgFlood)
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