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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 "rec-tcpout.hh"
// This line from /usr/include/openssl/ssl2.h: # define CERT char
// throws dnsrecords.hh off the rails.
#undef CERT
#include "syncres.hh"
timeval TCPOutConnectionManager::s_maxIdleTime;
size_t TCPOutConnectionManager::s_maxQueries;
size_t TCPOutConnectionManager::s_maxIdlePerAuth;
size_t TCPOutConnectionManager::s_maxIdlePerThread;
void TCPOutConnectionManager::cleanup(const struct timeval& now)
{
if (s_maxIdleTime.tv_sec == 0 && s_maxIdleTime.tv_usec == 0) {
// no maximum idle time
return;
}
for (auto it = d_idle_connections.begin(); it != d_idle_connections.end();) {
timeval idle = now - it->second.d_last_used;
if (s_maxIdleTime < idle) {
it = d_idle_connections.erase(it);
}
else {
++it;
}
}
}
void TCPOutConnectionManager::store(const struct timeval& now, const ComboAddress& ip, Connection&& connection)
{
++connection.d_numqueries;
if (s_maxQueries > 0 && connection.d_numqueries > s_maxQueries) {
return;
}
if (d_idle_connections.size() >= s_maxIdlePerThread || d_idle_connections.count(ip) >= s_maxIdlePerAuth) {
cleanup(now);
}
if (d_idle_connections.size() >= s_maxIdlePerThread) {
return;
}
if (d_idle_connections.count(ip) >= s_maxIdlePerAuth) {
return;
}
gettimeofday(&connection.d_last_used, nullptr);
d_idle_connections.emplace(ip, std::move(connection));
}
TCPOutConnectionManager::Connection TCPOutConnectionManager::get(const ComboAddress& ip)
{
if (d_idle_connections.count(ip) > 0) {
auto h = d_idle_connections.extract(ip);
return h.mapped();
}
return Connection{};
}
uint64_t getCurrentIdleTCPConnections()
{
return broadcastAccFunction<uint64_t>([] { return t_tcp_manager.getSize(); });
}
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