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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 <vector>
#include <thread>
#include "dnsname.hh"
#include "dnsdist-protocols.hh"
#include "iputils.hh"
#include "lock.hh"
struct DownstreamState;
namespace dnsdist
{
class ServiceDiscovery
{
public:
static bool addUpgradeableServer(std::shared_ptr<DownstreamState>& server, uint32_t interval, std::string poolAfterUpgrade, uint16_t dohSVCKey, bool keepAfterUpgrade);
/* starts a background thread if needed */
static bool run();
struct DiscoveredResolverConfig
{
ComboAddress d_addr;
std::string d_subjectName;
std::string d_dohPath;
uint16_t d_port{0};
dnsdist::Protocol d_protocol;
};
static const uint16_t s_defaultDoHSVCKey;
private:
static const DNSName s_discoveryDomain;
static const QType s_discoveryType;
struct UpgradeableBackend
{
std::shared_ptr<DownstreamState> d_ds;
std::string d_poolAfterUpgrade;
time_t d_nextCheck;
uint32_t d_interval;
uint16_t d_dohKey;
bool keepAfterUpgrade;
};
static bool getDiscoveredConfig(const UpgradeableBackend& backend, DiscoveredResolverConfig& config);
static bool tryToUpgradeBackend(const UpgradeableBackend& backend);
static void worker();
static LockGuarded<std::vector<std::shared_ptr<UpgradeableBackend>>> s_upgradeableBackends;
static std::thread s_thread;
};
}
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