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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <map>
#include "iputils.hh"
#include "lock.hh"
namespace dnsdist
{
class IncomingConcurrentTCPConnectionsManager
{
public:
static bool accountNewTCPConnection(const ComboAddress& from)
{
if (s_maxTCPConnectionsPerClient == 0) {
return true;
}
auto db = s_tcpClientsConcurrentConnectionsCount.lock();
auto& count = (*db)[from];
if (count >= s_maxTCPConnectionsPerClient) {
return false;
}
++count;
return true;
}
static void accountClosedTCPConnection(const ComboAddress& from)
{
if (s_maxTCPConnectionsPerClient == 0) {
return;
}
auto db = s_tcpClientsConcurrentConnectionsCount.lock();
auto& count = db->at(from);
count--;
if (count == 0) {
db->erase(from);
}
}
static void setMaxTCPConnectionsPerClient(size_t max)
{
s_maxTCPConnectionsPerClient = max;
}
private:
static LockGuarded<std::map<ComboAddress, size_t, ComboAddress::addressOnlyLessThan>> s_tcpClientsConcurrentConnectionsCount;
static size_t s_maxTCPConnectionsPerClient;
};
}
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