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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.
*/
#include "dnsdist-mac-address.hh"
#include "misc.hh"
namespace dnsdist
{
LockGuarded<boost::circular_buffer<MacAddressesCache::Entry>> MacAddressesCache::s_cache;
int MacAddressesCache::get(const ComboAddress& ca, unsigned char* dest, size_t destLen)
{
if (dest == nullptr || destLen < sizeof(Entry::mac)) {
return EINVAL;
}
auto compare = ComboAddress::addressOnlyEqual();
time_t now = time(nullptr);
{
auto cache = s_cache.lock();
for (const auto& entry : *cache) {
if (entry.ttd >= now && compare(entry.ca, ca) == true) {
if (!entry.found) {
// negative entry
return ENOENT;
}
memcpy(dest, entry.mac.data(), entry.mac.size());
return 0;
}
}
}
auto res = getMACAddress(ca, reinterpret_cast<char*>(dest), destLen);
{
auto cache = s_cache.lock();
if (cache->capacity() == 0) {
cache->set_capacity(MacAddressesCache::s_cacheSize);
}
Entry entry;
entry.ca = ca;
if (res == 0) {
memcpy(entry.mac.data(), dest, entry.mac.size());
entry.found = true;
}
else {
memset(entry.mac.data(), 0, entry.mac.size());
entry.found = false;
}
entry.ttd = now + MacAddressesCache::s_cacheValiditySeconds;
cache->push_back(std::move(entry));
}
return res;
}
}
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