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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2015  ZeroTier, Inc.
+ *
+ * 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/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef ZT_ONE_HPP
+#define ZT_ONE_HPP
+
+namespace ZeroTier {
+
+class NetworkConfigMaster;
+
+/**
+ * ZeroTier One -- local VPN/NVF service built around ZeroTier core
+ *
+ * Actual implementation is under the fold, hence the pure virtual
+ * interface.
+ */
+class One
+{
+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
+	};
+
+	/**
+	 * Create and start a new instance of the service
+	 *
+	 * @param hp Home path
+	 * @param port TCP and UDP port for packets and HTTP control
+	 * @param master Instance of network config master if this instance is to act as one (default: NULL)
+	 * @param overrideRootTopology String-serialized root topology (for testing, default: NULL)
+	 */
+	static One *newInstance(
+		const char *hp,
+		unsigned int port,
+		NetworkConfigMaster *master = (NetworkConfigMaster *)0),
+		const char *overrideRootTopology = (const char *)0);
+
+	/**
+	 * Deletion will block until service stops if it's still running
+	 */
+	virtual ~One();
+
+	/**
+	 * @return Reason for terminating or ONE_STILL_RUNNING if running
+	 */
+	virtual ReasonForTermination reasonForTermination() = 0;
+
+	/**
+	 * @return Fatal error message or empty string if none
+	 */
+	virtual std::string fatalErrorMessage() = 0;
+
+	/**
+	 * Block until service terminates
+	 */
+	virtual void waitForTermination() = 0;
+
+	/**
+	 * Terminate background service
+	 *
+	 * Actual shutdown might take a few seconds.
+	 */
+	virtual void terminate() = 0;
+
+	/**
+	 * @return True if service is still running
+	 */
+	inline isRunning() const { return (this->reasonForTermination() == ONE_STILL_RUNNING); }
+
+protected:
+	One() {}
+
+private:
+	One(const One &one) {}
+	inline One &operator=(const One &one) { return *this; }
+};
+
+} // namespace ZeroTier
+
+#endif