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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef ZT_ONESERVICE_HPP
#define ZT_ONESERVICE_HPP
#include <string>
namespace ZeroTier {
/**
* Local service for ZeroTier One as system VPN/NFV provider
*
* If built with ZT_ENABLE_NETWORK_CONTROLLER defined, this includes and
* runs controller/SqliteNetworkController with a database called
* controller.db in the specified home directory.
*
* If built with ZT_AUTO_UPDATE, an official ZeroTier update URL is
* periodically checked and updates are automatically downloaded, verified
* against a built-in list of update signing keys, and installed. This is
* only supported for certain platforms.
*
* If built with ZT_ENABLE_CLUSTER, a 'cluster' file is checked and if
* present is read to determine the identity of other cluster members.
*/
class OneService
{
public:
/**
* Returned by node main if/when it terminates
*/
enum ReasonForTermination
{
/**
* Instance is still running
*/
ONE_STILL_RUNNING = 0,
/**
* Normal shutdown
*/
ONE_NORMAL_TERMINATION = 1,
/**
* A serious unrecoverable error has occurred
*/
ONE_UNRECOVERABLE_ERROR = 2,
/**
* Your identity has collided with another
*/
ONE_IDENTITY_COLLISION = 3
};
/**
* @return Platform default home path or empty string if this platform doesn't have one
*/
static std::string platformDefaultHomePath();
/**
* @return Auto-update URL or empty string if auto-updates unsupported or not enabled
*/
static std::string autoUpdateUrl();
/**
* Create a new instance of the service
*
* Once created, you must call the run() method to actually start
* processing.
*
* The port is saved to a file in the home path called zerotier-one.port,
* which is used by the CLI and can be used to see which port was chosen if
* 0 (random port) is picked.
*
* @param hp Home path
* @param port TCP and UDP port for packets and HTTP control (if 0, pick random port)
*/
static OneService *newInstance(
const char *hp,
unsigned int port);
virtual ~OneService();
/**
* Execute the service main I/O loop until terminated
*
* The terminate() method may be called from a signal handler or another
* thread to terminate execution. Otherwise this will not return unless
* another condition terminates execution such as a fatal error.
*/
virtual ReasonForTermination run() = 0;
/**
* @return Reason for terminating or ONE_STILL_RUNNING if running
*/
virtual ReasonForTermination reasonForTermination() const = 0;
/**
* @return Fatal error message or empty string if none
*/
virtual std::string fatalErrorMessage() const = 0;
/**
* @return System device name corresponding with a given ZeroTier network ID or empty string if not opened yet or network ID not found
*/
virtual std::string portDeviceName(uint64_t nwid) const = 0;
/**
* @return True if TCP fallback is currently active
*/
virtual bool tcpFallbackActive() const = 0;
/**
* Terminate background service (can be called from other threads)
*/
virtual void terminate() = 0;
/**
* @return True if service is still running
*/
inline bool isRunning() const { return (this->reasonForTermination() == ONE_STILL_RUNNING); }
protected:
OneService() {}
private:
OneService(const OneService &one) {}
inline OneService &operator=(const OneService &one) { return *this; }
};
} // namespace ZeroTier
#endif
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