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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 "circular_buffer.hh"
#include "iputils.hh"
#include "lock.hh"
namespace dnsdist
{
using MacAddress = std::array<uint8_t, 6>;
class MacAddressesCache
{
public:
static int get(const ComboAddress& ca, unsigned char* dest, size_t len);
private:
struct Entry
{
ComboAddress ca;
MacAddress mac;
time_t ttd;
bool found;
};
static constexpr size_t s_cacheSize{10};
static constexpr time_t s_cacheValiditySeconds{60};
static LockGuarded<boost::circular_buffer<Entry>> s_cache;
};
}
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