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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-session-cache.hh"
TLSSessionCache g_sessionCache;
time_t TLSSessionCache::s_cleanupDelay{60};
time_t TLSSessionCache::s_sessionValidity{600};
uint16_t TLSSessionCache::s_maxSessionsPerBackend{20};
void TLSSessionCache::cleanup(time_t now, LockGuardedHolder<TLSSessionCache::CacheData>& data)
{
time_t cutOff = now + s_sessionValidity;
for (auto it = data->d_sessions.begin(); it != data->d_sessions.end();) {
if (it->second.d_lastUsed > cutOff || it->second.d_sessions.size() == 0) {
it = data->d_sessions.erase(it);
}
else {
++it;
}
}
data->d_nextCleanup = now + s_cleanupDelay;
}
void TLSSessionCache::putSessions(const boost::uuids::uuid& backendID, time_t now, std::vector<std::unique_ptr<TLSSession>>&& sessions)
{
auto data = d_data.lock();
if (data->d_nextCleanup == 0 || now > data->d_nextCleanup) {
cleanup(now, data);
}
for (auto& session : sessions) {
auto& entry = data->d_sessions[backendID];
if (entry.d_sessions.size() >= s_maxSessionsPerBackend) {
entry.d_sessions.pop_back();
}
entry.d_sessions.push_front(std::move(session));
}
}
std::unique_ptr<TLSSession> TLSSessionCache::getSession(const boost::uuids::uuid& backendID, time_t now)
{
auto data = d_data.lock();
auto it = data->d_sessions.find(backendID);
if (it == data->d_sessions.end()) {
return nullptr;
}
auto& entry = it->second;
if (entry.d_sessions.size() == 0) {
return nullptr;
}
entry.d_lastUsed = now;
auto value = std::move(entry.d_sessions.front());
entry.d_sessions.pop_front();
return value;
}
size_t TLSSessionCache::getSize()
{
size_t count = 0;
auto data = d_data.lock();
for (const auto& backend : data->d_sessions) {
count += backend.second.d_sessions.size();
}
return count;
}
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