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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2017-2023 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013-2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@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/exemption.h"
#include "numerichelper.h"
enum
{
RPL_ENDOFEXEMPTIONLIST = 953,
RPL_EXEMPTIONLIST = 954
};
class ExemptChanOps final
: public ListModeBase
{
public:
ExemptChanOps(Module* Creator)
: ListModeBase(Creator, "exemptchanops", 'X', RPL_EXEMPTIONLIST, RPL_ENDOFEXEMPTIONLIST)
{
syntax = "<restriction>:<prefix>";
}
static PrefixMode* FindMode(const std::string& pmode)
{
if (pmode.length() == 1)
{
PrefixMode* pm = ServerInstance->Modes.FindPrefixMode(pmode[0]);
if (!pm)
pm = ServerInstance->Modes.FindPrefix(pmode[0]);
return pm;
}
ModeHandler* mh = ServerInstance->Modes.FindMode(pmode, MODETYPE_CHANNEL);
return mh ? mh->IsPrefixMode() : nullptr;
}
static bool ParseEntry(const std::string& entry, std::string& restriction, std::string& prefix)
{
// The entry must be in the format <restriction>:<prefix>.
std::string::size_type colon = entry.find(':');
if (colon == std::string::npos || colon == entry.length()-1)
return false;
restriction.assign(entry, 0, colon);
prefix.assign(entry, colon + 1, std::string::npos);
return true;
}
ModResult AccessCheck(User* source, Channel* channel, Modes::Change& change) override
{
std::string restriction;
std::string prefix;
if (!ParseEntry(change.param, restriction, prefix))
return MOD_RES_PASSTHRU;
PrefixMode* pm = FindMode(prefix);
if (!pm)
return MOD_RES_PASSTHRU;
if (channel->GetPrefixValue(source) >= pm->GetLevelRequired(change.adding))
return MOD_RES_PASSTHRU;
source->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, INSP_FORMAT("You must be able to {} mode {} ({}) to {} a restriction containing it",
change.adding ? "set" : "unset", pm->GetModeChar(), pm->name, change.adding ? "add" : "remove"));
return MOD_RES_DENY;
}
bool ValidateParam(LocalUser* user, Channel* chan, std::string& parameter) override
{
// We only enforce the format restriction against local users to avoid causing a desync.
std::string restriction;
std::string prefix;
if (!ParseEntry(parameter, restriction, prefix))
{
user->WriteNumeric(Numerics::InvalidModeParameter(chan, this, parameter));
return false;
}
// If there is a '-' in the restriction string ignore it and everything after it
// to support "auditorium-vis" and "auditorium-see" in m_auditorium
std::string::size_type dash = restriction.find('-');
if (dash != std::string::npos)
restriction.erase(dash);
if (!ServerInstance->Modes.FindMode(restriction, MODETYPE_CHANNEL))
{
user->WriteNumeric(Numerics::InvalidModeParameter(chan, this, parameter, "Unknown restriction."));
return false;
}
if (prefix != "*" && !FindMode(prefix))
{
user->WriteNumeric(Numerics::InvalidModeParameter(chan, this, parameter, "Unknown prefix mode."));
return false;
}
return true;
}
};
class ExemptHandler final
: public CheckExemption::EventListener
{
public:
ExemptChanOps ec;
ExemptHandler(Module* me)
: CheckExemption::EventListener(me)
, ec(me)
{
}
ModResult OnCheckExemption(User* user, Channel* chan, const std::string& restriction) override
{
ModeHandler::Rank mypfx = chan->GetPrefixValue(user);
std::string minmode;
ListModeBase::ModeList* list = ec.GetList(chan);
if (list)
{
for (const auto& entry : *list)
{
std::string::size_type pos = entry.mask.find(':');
if (pos == std::string::npos)
continue;
if (!entry.mask.compare(0, pos, restriction))
minmode.assign(entry.mask, pos + 1, std::string::npos);
}
}
PrefixMode* mh = ExemptChanOps::FindMode(minmode);
if (mh && mypfx >= mh->GetPrefixRank())
return MOD_RES_ALLOW;
if (mh || minmode == "*")
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
};
class ModuleExemptChanOps final
: public Module
{
private:
ExemptHandler eh;
public:
ModuleExemptChanOps()
: Module(VF_VENDOR, "Adds channel mode X (exemptchanops) which allows channel operators to grant exemptions to various channel-level restrictions.")
, eh(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
eh.ec.DoRehash();
}
};
MODULE_INIT(ModuleExemptChanOps)
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