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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013-2014, 2017, 2019-2023 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2013, 2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009, 2012 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 "numerichelper.h"
class CommandChghost final
: public Command
{
public:
CharState hostmap;
CommandChghost(Module* Creator)
: Command(Creator, "CHGHOST", 2)
{
access_needed = CmdAccess::OPERATOR;
syntax = { "<nick> <host>" };
translation = { TR_NICK, TR_TEXT };
}
CmdResult Handle(User* user, const Params& parameters) override
{
if (parameters[1].length() > ServerInstance->Config->Limits.MaxHost)
{
user->WriteNotice("*** CHGHOST: Host too long");
return CmdResult::FAILURE;
}
for (const auto chr : parameters[1])
{
if (!hostmap.test(static_cast<unsigned char>(chr)))
{
user->WriteNotice("*** CHGHOST: Invalid characters in hostname");
return CmdResult::FAILURE;
}
}
auto* dest = ServerInstance->Users.Find(parameters[0]);
// Allow services to change the host of partially connected users.
if (!dest || (!dest->IsFullyConnected() && !user->server->IsService()))
{
user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
return CmdResult::FAILURE;
}
if (IS_LOCAL(dest))
{
dest->ChangeDisplayedHost(parameters[1]);
if (!user->server->IsService())
{
ServerInstance->SNO.WriteGlobalSno('a', user->nick+" used CHGHOST to make the displayed host of "+dest->nick+" become "+dest->GetDisplayedHost());
}
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_OPT_UCAST(parameters[0]);
}
};
class ModuleChgHost final
: public Module
{
private:
CommandChghost cmd;
public:
ModuleChgHost()
: Module(VF_VENDOR | VF_OPTCOMMON, "Adds the /CHGHOST command which allows server operators to change the displayed hostname of a user.")
, cmd(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("hostname");
const std::string hmap = tag->getString("charmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.-_/0123456789", 1);
CharState newhostmap;
for (const auto chr : hmap)
{
// A hostname can not contain NUL, LF, CR, or SPACE.
if (chr == 0x00 || chr == 0x0A || chr == 0x0D || chr == 0x20)
throw ModuleException(this, "<hostname:charmap> can not contain character 0x{:02X} ({})", chr, chr);
newhostmap.set(static_cast<unsigned char>(chr));
}
std::swap(newhostmap, cmd.hostmap);
}
void GetLinkData(Module::LinkData& data) override
{
for (size_t i = 0; i < cmd.hostmap.size(); ++i)
if (cmd.hostmap[i])
data["hostchars"].push_back(static_cast<unsigned char>(i));
}
};
MODULE_INIT(ModuleChgHost)
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