1 files changed, 50 insertions, 0 deletions
diff --git a/dnsdist-mac-address.hh b/dnsdist-mac-address.hh
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+++ b/dnsdist-mac-address.hh
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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;
+};
+}