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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2017, 2019-2023, 2025 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2013 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* 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/ircv3.h"
#include "numerichelper.h"
class CommandSetHost final
: public Command
{
public:
IRCv3::ReplyCapReference cap;
CharState hostmap;
CommandSetHost(const WeakModulePtr& mod)
: Command(mod, "SETHOST", 1, 2)
, cap(mod)
{
access_needed = CmdAccess::OPERATOR;
syntax = { "[<nick>] :<newhost>" };
}
CmdResult Handle(User* user, const Params& parameters) override
{
auto* target = user;
if (parameters.size() > 1)
{
const auto& targetnick = parameters[0];
if (user->IsLocal())
{
// For local users we need to check if they can use the command.
target = ServerInstance->Users.FindNick(targetnick, true);
if (user != target && !user->HasPrivPermission("users/sethost-others"))
{
user->WriteNumeric(Numerics::NoPrivileges("your server operator account does not have the users/sethost-others privilege"));
return CmdResult::FAILURE;
}
}
else
{
// For remote users their server will have checked privs.
target = ServerInstance->Users.Find(targetnick);
}
if (!target)
{
user->WriteNumeric(Numerics::NoSuchNick(targetnick));
return CmdResult::FAILURE;
}
}
if (!target->IsLocal())
return CmdResult::SUCCESS; // Their server will handle this.
const auto& newhost = parameters.back();
if (newhost.size() > ServerInstance->Config->Limits.MaxHost)
{
IRCv3::WriteReply(Reply::FAIL, user, cap, this, "INVALID_HOSTNAME", "Hostname is too long");
return CmdResult::FAILURE;
}
for (const auto chr : newhost)
{
if (!hostmap.test(static_cast<unsigned char>(chr)))
{
IRCv3::WriteReply(Reply::FAIL, user, cap, this, "INVALID_HOSTNAME", "Invalid characters in hostname");
return CmdResult::FAILURE;
}
}
target->ChangeDisplayedHost(newhost);
if (!user->server->IsService())
{
ServerInstance->SNO.WriteGlobalSno('a', "{} ({}) used {} to change the hostname of {} to \"{}\x0F\"",
user->GetRealMask(), user->GetAddress(), this->service_name, target->nick, newhost);
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return parameters.size() > 1 ? ROUTE_OPT_UCAST(parameters[0]) : ROUTE_LOCALONLY;
}
};
class ModuleSetHost final
: public Module
{
private:
CommandSetHost cmd;
public:
ModuleSetHost()
: Module(VF_VENDOR | VF_OPTCOMMON, "Adds the /SETHOST command which allows server operators to change the hostname of users.")
, cmd(weak_from_this())
{
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("hostname");
CharState newhostmap;
for (const auto chr : tag->getString("charmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.-_/0123456789", 1))
{
// A hostname can not contain NUL, LF, CR, or SPACE.
if (chr == 0x00 || chr == 0x0A || chr == 0x0D || chr == 0x20)
throw ModuleException(weak_from_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(ModuleSetHost)
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