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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"
/* $ModDesc: Throttles the connections of IP ranges who try to connect flood. */
class ModuleConnectBan : public Module
{
private:
clonemap connects;
unsigned int threshold;
unsigned int banduration;
unsigned int ipv4_cidr;
unsigned int ipv6_cidr;
public:
ModuleConnectBan(InspIRCd* Me) : Module(Me)
{
Implementation eventlist[] = { I_OnUserConnect, I_OnGarbageCollect, I_OnRehash };
ServerInstance->Modules->Attach(eventlist, this, 3);
OnRehash(NULL);
}
virtual ~ModuleConnectBan()
{
}
virtual Version GetVersion()
{
return Version("$Id$", VF_VENDOR,API_VERSION);
}
virtual void OnRehash(User* user)
{
ConfigReader Conf(ServerInstance);
std::string duration;
ipv4_cidr = Conf.ReadInteger("connectban", "ipv4cidr", 0, true);
if (ipv4_cidr == 0)
ipv4_cidr = 32;
ipv6_cidr = Conf.ReadInteger("connectban", "ipv6cidr", 0, true);
if (ipv6_cidr == 0)
ipv6_cidr = 128;
threshold = Conf.ReadInteger("connectban", "threshold", 0, true);
if (threshold == 0)
threshold = 10;
duration = Conf.ReadValue("connectban", "duration", 0, true);
if (duration.empty())
duration = "10m";
banduration = ServerInstance->Duration(duration);
}
virtual void OnUserConnect(User *u)
{
int range = 32;
clonemap::iterator i;
switch (u->GetProtocolFamily())
{
#ifdef SUPPORT_IP6LINKS
case AF_INET6:
{
range = ipv6_cidr;
}
break;
#endif
case AF_INET:
{
range = ipv4_cidr;
}
break;
}
i = connects.find(u->GetCIDRMask(range));
if (i != connects.end())
{
i->second++;
if (i->second >= threshold)
{
// Create zline for set duration.
ZLine* zl = new ZLine(ServerInstance, 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.", u->GetCIDRMask(range));
if (ServerInstance->XLines->AddLine(zl,NULL))
ServerInstance->XLines->ApplyLines();
else
delete zl;
ServerInstance->SNO->WriteToSnoMask('x', "Connect flooding from IP range %s (%d)", u->GetCIDRMask(range), threshold);
connects.erase(i);
}
}
else
{
connects[u->GetCIDRMask(range)] = 1;
}
}
virtual void OnGarbageCollect()
{
ServerInstance->Logs->Log("m_connectban",DEBUG, "Clearing map.");
connects.clear();
}
};
MODULE_INIT(ModuleConnectBan)
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