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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2017 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
* Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2010 Craig Edwards <brain@inspircd.org>
* 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"
static std::bitset<UCHAR_MAX + 1> allowedmap;
class NewIsChannelHandler final
{
public:
static bool Call(const std::string&);
};
bool NewIsChannelHandler::Call(const std::string& channame)
{
if (channame.empty() || channame.length() > ServerInstance->Config->Limits.MaxChannel || !ServerInstance->Channels.IsPrefix(channame[0]))
return false;
for (const auto& chr : channame)
{
if (!allowedmap[static_cast<unsigned char>(chr)])
return false;
}
return true;
}
class ModuleChannelNames final
: public Module
{
std::function<bool(const std::string&)> rememberer;
bool badchan = false;
ChanModeReference permchannelmode;
public:
ModuleChannelNames()
: Module(VF_VENDOR, "Allows the server administrator to define what characters are allowed in channel names.")
, rememberer(ServerInstance->Channels.IsChannel)
, permchannelmode(this, "permanent")
{
}
void ValidateChans()
{
Modes::ChangeList removepermchan;
badchan = true;
const ChannelMap& chans = ServerInstance->Channels.GetChans();
for (ChannelMap::const_iterator i = chans.begin(); i != chans.end(); )
{
Channel* c = i->second;
// Move iterator before we begin kicking
++i;
if (ServerInstance->Channels.IsChannel(c->name))
continue; // The name of this channel is still valid
if (c->IsModeSet(permchannelmode) && c->GetUserCounter())
{
removepermchan.clear();
removepermchan.push_remove(*permchannelmode);
ServerInstance->Modes.Process(ServerInstance->FakeClient, c, NULL, removepermchan);
}
Channel::MemberMap& users = c->userlist;
for (Channel::MemberMap::iterator j = users.begin(); j != users.end(); )
{
if (IS_LOCAL(j->first))
{
// KickUser invalidates the iterator
Channel::MemberMap::iterator it = j++;
c->KickUser(ServerInstance->FakeClient, it, "Channel name no longer valid");
}
else
++j;
}
}
badchan = false;
}
void ReadConfig(ConfigStatus& status) override
{
auto tag = ServerInstance->Config->ConfValue("channames");
std::string denyToken = tag->getString("denyrange");
std::string allowToken = tag->getString("allowrange");
if (!denyToken.compare(0, 2, "0-"))
denyToken[0] = '1';
if (!allowToken.compare(0, 2, "0-"))
allowToken[0] = '1';
allowedmap.set();
irc::portparser denyrange(denyToken, false);
long denyno = -1;
while (0 != (denyno = denyrange.GetToken()))
allowedmap[denyno & UCHAR_MAX] = false;
irc::portparser allowrange(allowToken, false);
long allowno = -1;
while (0 != (allowno = allowrange.GetToken()))
allowedmap[allowno & UCHAR_MAX] = true;
allowedmap[0x07] = false; // BEL
allowedmap[0x20] = false; // ' '
allowedmap[0x2C] = false; // ','
ServerInstance->Channels.IsChannel = NewIsChannelHandler::Call;
ValidateChans();
}
void OnUserKick(User* source, Membership* memb, const std::string &reason, CUList& except_list) override
{
if (badchan)
{
for (const auto& [user, _] : memb->chan->GetUsers())
{
if (user != memb->user)
except_list.insert(user);
}
}
}
Cullable::Result Cull() override
{
ServerInstance->Channels.IsChannel = rememberer;
ValidateChans();
return Module::Cull();
}
};
MODULE_INIT(ModuleChannelNames)
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