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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2019 linuxdaemon <linuxdaemon.irc@gmail.com>
* Copyright (C) 2019 Matt Schatz <genius3000@g3k.solutions>
* Copyright (C) 2017-2024 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2012 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006 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 "modules/callerid.h"
#include "modules/exemption.h"
#include "modules/extban.h"
#include "numerichelper.h"
class ModuleNoCTCP final
: public Module
{
private:
CallerID::API calleridapi;
CheckExemption::EventProvider exemptionprov;
ExtBan::Acting extban;
SimpleChannelMode nc;
SimpleUserMode ncu;
public:
ModuleNoCTCP()
: Module(VF_VENDOR, "Adds channel mode C (noctcp) which allows channels to block messages which contain CTCPs and user mode T (u_noctcp) which allows users to block private messages that contain CTCPs.")
, calleridapi(this)
, exemptionprov(this)
, extban(this, "noctcp", 'C')
, nc(this, "noctcp", 'C')
, ncu(this, "u_noctcp", 'T')
{
}
ModResult OnUserPreMessage(User* user, MessageTarget& target, MessageDetails& details) override
{
if (!IS_LOCAL(user))
return MOD_RES_PASSTHRU;
std::string_view ctcpname;
if (!details.IsCTCP(ctcpname) || irc::equals(ctcpname, "ACTION"))
return MOD_RES_PASSTHRU;
switch (target.type)
{
case MessageTarget::TYPE_CHANNEL:
{
if (user->HasPrivPermission("channels/ignore-noctcp"))
return MOD_RES_PASSTHRU;
auto* c = target.Get<Channel>();
for (const auto& [u, _] : c->GetUsers())
{
if (u->IsModeSet(ncu))
details.exemptions.insert(u);
}
ModResult res = exemptionprov.Check(user, c, "noctcp");
if (res == MOD_RES_ALLOW)
return MOD_RES_PASSTHRU;
if (c->IsModeSet(nc))
{
user->WriteNumeric(Numerics::CannotSendTo(c, "CTCPs", &nc));
return MOD_RES_DENY;
}
if (extban.GetStatus(user, c) == MOD_RES_DENY)
{
user->WriteNumeric(Numerics::CannotSendTo(c, "CTCPs", extban));
return MOD_RES_DENY;
}
break;
}
case MessageTarget::TYPE_USER:
{
auto* targetuser = target.Get<User>();
if (user->HasPrivPermission("users/ignore-noctcp"))
return MOD_RES_PASSTHRU;
if (calleridapi && calleridapi->IsOnAcceptList(user, targetuser))
return MOD_RES_PASSTHRU;
if (targetuser->IsModeSet(ncu))
{
// Don't send an error message if we're blocking an automatic CTCP reply.
if (details.type == MessageType::NOTICE)
user->WriteNumeric(Numerics::CannotSendTo(targetuser, "CTCPs", &ncu));
return MOD_RES_DENY;
}
break;
}
case MessageTarget::TYPE_SERVER:
{
if (user->HasPrivPermission("users/ignore-noctcp"))
return MOD_RES_PASSTHRU;
for (auto* u : ServerInstance->Users.GetLocalUsers())
{
if (u->IsModeSet(ncu))
details.exemptions.insert(u);
}
break;
}
}
return MOD_RES_PASSTHRU;
}
};
MODULE_INIT(ModuleNoCTCP)
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