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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"
/* $ModDesc: Provides channel mode +f (message flood protection) */
/** Holds flood settings and state for mode +f
*/
class floodsettings
{
public:
bool ban;
unsigned int secs;
unsigned int lines;
time_t reset;
std::map<User*, unsigned int> counters;
floodsettings(bool a, int b, 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)
{
std::map<User*, unsigned int>::iterator iter = counters.find(who);
if (iter != counters.end())
{
counters.erase(iter);
}
}
};
/** Handles channel mode +f
*/
class MsgFlood : public ModeHandler
{
public:
SimpleExtItem<floodsettings> ext;
MsgFlood(Module* Creator) : ModeHandler(Creator, "flood", 'f', PARAM_SETONLY, MODETYPE_CHANNEL),
ext("messageflood", Creator) { }
ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding)
{
if (adding)
{
std::string::size_type colon = parameter.find(':');
if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
return MODEACTION_DENY;
}
/* Set up the flood parameters for this channel */
bool ban = (parameter[0] == '*');
unsigned int nlines = ConvToInt(parameter.substr(ban ? 1 : 0, ban ? colon-1 : colon));
unsigned int nsecs = ConvToInt(parameter.substr(colon+1));
if ((nlines<2) || (nsecs<1))
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
return MODEACTION_DENY;
}
floodsettings* f = ext.get(channel);
if ((f) && (nlines == f->lines) && (nsecs == f->secs) && (ban == f->ban))
// mode params match
return MODEACTION_DENY;
ext.set(channel, new floodsettings(ban, nsecs, nlines));
parameter = std::string(ban ? "*" : "") + ConvToStr(nlines) + ":" + ConvToStr(nsecs);
channel->SetModeParam('f', parameter);
return MODEACTION_ALLOW;
}
else
{
if (!channel->IsModeSet('f'))
return MODEACTION_DENY;
ext.unset(channel);
channel->SetModeParam('f', "");
return MODEACTION_ALLOW;
}
}
};
class ModuleMsgFlood : public Module
{
MsgFlood mf;
public:
ModuleMsgFlood()
: mf(this)
{
}
void init() CXX11_OVERRIDE
{
ServerInstance->Modules->AddService(mf);
ServerInstance->Modules->AddService(mf.ext);
ServerInstance->Modules->Attach(I_OnUserPreMessage, this);
}
ModResult ProcessMessages(User* user,Channel* dest, const std::string &text)
{
if ((!IS_LOCAL(user)) || !dest->IsModeSet('f'))
return MOD_RES_PASSTHRU;
if (ServerInstance->OnCheckExemption(user,dest,"flood") == 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)
{
std::vector<std::string> parameters;
parameters.push_back(dest->name);
parameters.push_back("+b");
parameters.push_back("*!*@" + user->dhost);
ServerInstance->SendGlobalMode(parameters, ServerInstance->FakeClient);
}
const std::string kickMessage = "Channel flood triggered (limit is " + ConvToStr(f->lines) +
" in " + ConvToStr(f->secs) + " secs)";
dest->KickUser(ServerInstance->FakeClient, user, kickMessage);
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE
{
if (target_type == TYPE_CHANNEL)
return ProcessMessages(user,(Channel*)dest,text);
return MOD_RES_PASSTHRU;
}
void Prioritize()
{
// 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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