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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* 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 "xline.h"
/* $ModDesc: Throttles the connections of IP ranges who try to connect flood. */
class ModuleConnectBan : public Module
{
clonemap connects;
unsigned int threshold;
unsigned int banduration;
unsigned int ipv4_cidr;
unsigned int ipv6_cidr;
public:
void init() CXX11_OVERRIDE
{
Implementation eventlist[] = { I_OnSetUserIP, I_OnGarbageCollect, I_OnRehash };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
OnRehash(NULL);
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Throttles the connections of IP ranges who try to connect flood.", VF_VENDOR);
}
void OnRehash(User* user) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("connectban");
ipv4_cidr = tag->getInt("ipv4cidr", 32);
if (ipv4_cidr == 0)
ipv4_cidr = 32;
ipv6_cidr = tag->getInt("ipv6cidr", 128);
if (ipv6_cidr == 0)
ipv6_cidr = 128;
threshold = tag->getInt("threshold", 10);
if (threshold == 0)
threshold = 10;
banduration = InspIRCd::Duration(tag->getString("duration", "10m"));
if (banduration == 0)
banduration = 10*60;
}
void OnSetUserIP(LocalUser* u) CXX11_OVERRIDE
{
if (u->exempt)
return;
int range = 32;
clonemap::iterator i;
switch (u->client_sa.sa.sa_family)
{
case AF_INET6:
range = ipv6_cidr;
break;
case AF_INET:
range = ipv4_cidr;
break;
}
irc::sockets::cidr_mask mask(u->client_sa, range);
i = connects.find(mask);
if (i != connects.end())
{
i->second++;
if (i->second >= threshold)
{
// Create zline for set duration.
ZLine* zl = new ZLine(ServerInstance->Time(), banduration, ServerInstance->Config->ServerName, "Your IP range has been attempting to connect too many times in too short a duration. Wait a while, and you will be able to connect.", mask.str());
if (!ServerInstance->XLines->AddLine(zl, NULL))
{
delete zl;
return;
}
ServerInstance->XLines->ApplyLines();
std::string maskstr = mask.str();
std::string timestr = ServerInstance->TimeString(zl->expiry);
ServerInstance->SNO->WriteGlobalSno('x',"Module m_connectban added Z:line on *@%s to expire on %s: Connect flooding",
maskstr.c_str(), timestr.c_str());
ServerInstance->SNO->WriteGlobalSno('a', "Connect flooding from IP range %s (%d)", maskstr.c_str(), threshold);
connects.erase(i);
}
}
else
{
connects[mask] = 1;
}
}
void OnGarbageCollect()
{
ServerInstance->Logs->Log("m_connectban", LOG_DEBUG, "Clearing map.");
connects.clear();
}
};
MODULE_INIT(ModuleConnectBan)
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