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diff --git a/osdep/SoftwareUpdater.hpp b/osdep/SoftwareUpdater.hpp
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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_SOFTWAREUPDATER_HPP
+#define ZT_SOFTWAREUPDATER_HPP
+
+#include <stdint.h>
+
+#include <string>
+
+#include "Constants.hpp"
+#include "Mutex.hpp"
+#include "Utils.hpp"
+#include "Defaults.hpp"
+#include "Address.hpp"
+
+namespace ZeroTier {
+
+class RuntimeEnvironment;
+
+/**
+ * Software updater
+ */
+class SoftwareUpdater
+{
+public:
+	SoftwareUpdater(const RuntimeEnvironment *renv);
+	~SoftwareUpdater();
+
+	/**
+	 * Remove old updates in updates.d
+	 */
+	void cleanOldUpdates();
+
+	/**
+	 * Called on each version message from a peer
+	 *
+	 * If a peer has a newer version, that causes an update to be started.
+	 *
+	 * @param vmaj Peer's major version
+	 * @param vmin Peer's minor version
+	 * @param rev Peer's revision
+	 */
+	void sawRemoteVersion(unsigned int vmaj,unsigned int vmin,unsigned int rev);
+
+	/**
+	 * Check for updates now regardless of last check time or version
+	 *
+	 * This only starts a check if one is not in progress. Otherwise it does
+	 * nothing.
+	 */
+	void checkNow();
+
+	/**
+	 * Check for updates now if it's been longer than ZT_UPDATE_MAX_INTERVAL
+	 *
+	 * This is called periodically from the main loop.
+	 */
+	inline void checkIfMaxIntervalExceeded(uint64_t now)
+	{
+		if ((now - _lastUpdateAttempt) >= ZT_UPDATE_MAX_INTERVAL)
+			checkNow();
+	}
+
+	/**
+	 * Pack three-component version into a 64-bit integer
+	 *
+	 * @param vmaj Major version (0..65535)
+	 * @param vmin Minor version (0..65535)
+	 * @param rev Revision (0..65535)
+	 * @return Version packed into an easily comparable 64-bit integer
+	 */
+	static inline uint64_t packVersion(unsigned int vmaj,unsigned int vmin,unsigned int rev)
+		throw()
+	{
+		return ( ((uint64_t)(vmaj & 0xffff) << 32) | ((uint64_t)(vmin & 0xffff) << 16) | (uint64_t)(rev & 0xffff) );
+	}
+
+	/**
+	 * Parse NFO data from .nfo file on software update site
+	 *
+	 * The first argument is the NFO data, and all the remaining arguments are
+	 * result parameters to be filled with results. If an error is returned the
+	 * results in the parameters should be considered undefined.
+	 *
+	 * @param nfo NFO data
+	 * @param vMajor Result: major version
+	 * @param vMinor Result: minor version
+	 * @param vRevision Result: revision number
+	 * @param signedBy Result: signing identity
+	 * @param signature Result: Ed25519 signature data
+	 * @param url Result: URL of update binary
+	 * @return NULL on success or error message on failure
+	 */
+	static const char *parseNfo(
+		const char *nfoText,
+		unsigned int &vMajor,
+		unsigned int &vMinor,
+		unsigned int &vRevision,
+		Address &signedBy,
+		std::string &signature,
+		std::string &url);
+
+	/**
+	 * Validate an update once downloaded
+	 *
+	 * This obtains the identity corresponding to the address from the compiled-in
+	 * list of valid signing identities.
+	 *
+	 * @param data Update data
+	 * @param len Length of update data
+	 * @param signedBy Signing authority address
+	 * @param signature Signing authority signature
+	 * @return True on validation success, false if rejected
+	 */
+	static bool validateUpdate(
+		const void *data,
+		unsigned int len,
+		const Address &signedBy,
+		const std::string &signature);
+
+private:
+	static void _cbHandleGetLatestVersionInfo(void *arg,int code,const std::string &url,const std::string &body);
+	static void _cbHandleGetLatestVersionBinary(void *arg,int code,const std::string &url,const std::string &body);
+
+	const RuntimeEnvironment *RR;
+	const uint64_t _myVersion;
+	volatile uint64_t _lastUpdateAttempt;
+	volatile enum {
+		UPDATE_STATUS_IDLE,
+		UPDATE_STATUS_GETTING_NFO,
+		UPDATE_STATUS_GETTING_FILE
+	} _status;
+	volatile bool _die;
+	Address _signedBy;
+	std::string _signature;
+	Mutex _lock;
+};
+
+} // namespace ZeroTier
+
+#endif