/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2020 iwalkalone <iwalkalone69@gmail.com>
* Copyright (C) 2018 linuxdaemon <linuxdaemon.irc@gmail.com>
* Copyright (C) 2017 B00mX0r <b00mx0r@aureus.pw>
* Copyright (C) 2016, 2019 Matt Schatz <genius3000@g3k.solutions>
* Copyright (C) 2013, 2017-2018, 2020-2022 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
* Copyright (C) 2012-2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 John Brooks <special@inspircd.org>
* Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2005-2008 Craig Edwards <brain@inspircd.org>
*
* 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 "listmode.h"
#include "modules/extban.h"
#include "numerichelper.h"
#include "timeutils.h"
// Holds a timed ban
class TimedBan final
{
public:
std::string mask;
std::string setter;
time_t expire;
Channel* chan;
};
typedef std::vector<TimedBan> timedbans;
timedbans TimedBanList;
class CommandTban final
: public Command
{
private:
ChanModeReference banmode;
ExtBan::ManagerRef extbanmgr;
bool IsBanSet(Channel* chan, const std::string& mask)
{
ListModeBase* banlm = static_cast<ListModeBase*>(*banmode);
if (!banlm)
return false;
const ListModeBase::ModeList* bans = banlm->GetList(chan);
if (bans)
{
for (const auto& ban : *bans)
{
if (irc::equals(ban.mask, mask))
return true;
}
}
return false;
}
public:
bool sendnotice;
CommandTban(Module* Creator)
: Command(Creator, "TBAN", 3)
, banmode(Creator, "ban")
, extbanmgr(Creator)
{
syntax = { "<channel> <duration> <banmask>" };
}
CmdResult Handle(User* user, const Params& parameters) override
{
auto* channel = ServerInstance->Channels.Find(parameters[0]);
if (!channel)
{
user->WriteNumeric(Numerics::NoSuchChannel(parameters[0]));
return CmdResult::FAILURE;
}
ModeHandler::Rank cm = channel->GetPrefixValue(user);
if (cm < HALFOP_VALUE)
{
user->WriteNumeric(Numerics::ChannelPrivilegesNeeded(channel, HALFOP_VALUE, "set timed bans"));
return CmdResult::FAILURE;
}
TimedBan T;
unsigned long duration;
if (!Duration::TryFrom(parameters[1], duration))
{
user->WriteNotice("Invalid ban time");
return CmdResult::FAILURE;
}
unsigned long expire = duration + ServerInstance->Time();
std::string mask = parameters[2];
if (!extbanmgr || !extbanmgr->Canonicalize(mask))
ModeParser::CleanMask(mask);
if (IsBanSet(channel, mask))
{
user->WriteNotice("Ban already set");
return CmdResult::FAILURE;
}
Modes::ChangeList setban;
setban.push_add(*banmode, mask);
// Pass the user (instead of ServerInstance->FakeClient) to ModeHandler::Process() to
// make it so that the user sets the mode themselves
ServerInstance->Modes.Process(user, channel, nullptr, setban);
if (ServerInstance->Modes.GetLastChangeList().empty())
{
user->WriteNotice("Invalid ban mask");
return CmdResult::FAILURE;
}
// Attempt to find the actual set ban mask.
for (const auto& mc : ServerInstance->Modes.GetLastChangeList().getlist())
{
if (mc.mh == *banmode)
{
// We found the actual mask.
mask = mc.param;
break;
}
}
T.mask = mask;
T.setter = user->nick;
T.expire = expire + (IS_REMOTE(user) ? 5 : 0);
T.chan = channel;
TimedBanList.push_back(T);
if (sendnotice)
{
const std::string message = INSP_FORMAT("Timed ban {} added by {} on {} lasting for {}.",
mask, user->nick, channel->name, Duration::ToString(duration));
// If halfop is loaded, send notice to halfops and above, otherwise send to ops and above
PrefixMode* mh = ServerInstance->Modes.FindNearestPrefixMode(HALFOP_VALUE);
char pfxchar = mh ? mh->GetPrefix() : '@';
channel->WriteRemoteNotice(message, pfxchar);
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_BROADCAST;
}
};
class BanWatcher final
: public ModeWatcher
{
public:
BanWatcher(Module* parent)
: ModeWatcher(parent, "ban", MODETYPE_CHANNEL)
{
}
void AfterMode(User* source, User* dest, Channel* chan, const Modes::Change& change) override
{
if (change.adding)
return;
for (timedbans::iterator i = TimedBanList.begin(); i != TimedBanList.end(); ++i)
{
if (i->chan != chan)
continue;
const std::string& target = i->mask;
if (irc::equals(change.param, target))
{
TimedBanList.erase(i);
break;
}
}
}
};
class ChannelMatcher final
{
Channel* const chan;
public:
ChannelMatcher(Channel* ch)
: chan(ch)
{
}
bool operator()(const TimedBan& tb) const
{
return (tb.chan == chan);
}
};
class ModuleTimedBans final
: public Module
{
private:
ChanModeReference banmode;
CommandTban cmd;
BanWatcher banwatcher;
public:
ModuleTimedBans()
: Module(VF_VENDOR | VF_COMMON, "Adds the /TBAN command which allows channel operators to add bans which will be expired after the specified period.")
, banmode(this, "ban")
, cmd(this)
, banwatcher(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("timedbans");
cmd.sendnotice = tag->getBool("sendnotice", true);
}
void OnBackgroundTimer(time_t curtime) override
{
timedbans expired;
for (timedbans::iterator i = TimedBanList.begin(); i != TimedBanList.end();)
{
if (curtime > i->expire)
{
expired.push_back(*i);
i = TimedBanList.erase(i);
}
else
++i;
}
for (const auto& timedban : expired)
{
if (cmd.sendnotice)
{
const std::string message = INSP_FORMAT("Timed ban {} set by {} on {} has expired.",
timedban.mask, timedban.setter, timedban.chan->name);
// If halfop is loaded, send notice to halfops and above, otherwise send to ops and above
PrefixMode* mh = ServerInstance->Modes.FindNearestPrefixMode(HALFOP_VALUE);
char pfxchar = mh ? mh->GetPrefix() : '@';
timedban.chan->WriteRemoteNotice(message, pfxchar);
}
Modes::ChangeList setban;
setban.push_remove(*banmode, timedban.mask);
ServerInstance->Modes.Process(ServerInstance->FakeClient, timedban.chan, nullptr, setban);
}
}
void OnChannelDelete(Channel* chan) override
{
// Remove all timed bans affecting the channel from internal bookkeeping
TimedBanList.erase(std::remove_if(TimedBanList.begin(), TimedBanList.end(), ChannelMatcher(chan)), TimedBanList.end());
}
};
MODULE_INIT(ModuleTimedBans)
