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diff --git a/osdep/OSUtils.hpp b/osdep/OSUtils.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_OSUTILS_HPP
+#define ZT_OSUTILS_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+
+#include <string>
+#include <stdexcept>
+#include <vector>
+#include <map>
+
+#include "../node/Constants.hpp"
+
+#ifdef __WINDOWS__
+#include <WinSock2.h>
+#include <Windows.h>
+#else
+#include <unistd.h>
+#include <sys/time.h>
+#include <arpa/inet.h>
+#endif
+
+namespace ZeroTier {
+
+/**
+ * Miscellaneous utility functions and global constants
+ */
+class OSUtils
+{
+public:
+#ifdef __UNIX_LIKE__
+	/**
+	 * Close STDOUT_FILENO and STDERR_FILENO and replace them with output to given path
+	 *
+	 * This can be called after fork() and prior to exec() to suppress output
+	 * from a subprocess, such as auto-update.
+	 *
+	 * @param stdoutPath Path to file to use for stdout
+	 * @param stderrPath Path to file to use for stderr, or NULL for same as stdout (default)
+	 * @return True on success
+	 */
+	static bool redirectUnixOutputs(const char *stdoutPath,const char *stderrPath = (const char *)0)
+		throw();
+#endif // __UNIX_LIKE__
+
+	/**
+	 * Delete a file
+	 *
+	 * @param path Path to delete
+	 * @return True if delete was successful
+	 */
+	static inline bool rm(const char *path)
+		throw()
+	{
+#ifdef __WINDOWS__
+		return (DeleteFileA(path) != FALSE);
+#else
+		return (unlink(path) == 0);
+#endif
+	}
+	static inline bool rm(const std::string &path) throw() { return rm(path.c_str()); }
+
+	/**
+	 * List a directory's contents
+	 * 
+	 * Keys in returned map are filenames only and don't include the leading
+	 * path. Pseudo-paths like . and .. are not returned. Values are true if
+	 * the item is a directory, false if it's a file. More detailed attributes
+	 * aren't supported since the code that uses this doesn't need them.
+	 *
+	 * @param path Path to list
+	 * @return Map of entries and whether or not they are also directories (empty on failure)
+	 */
+	static std::map<std::string,bool> listDirectory(const char *path);
+
+	/**
+	 * Set modes on a file to something secure
+	 * 
+	 * This locks a file so that only the owner can access it. What it actually
+	 * does varies by platform.
+	 * 
+	 * @param path Path to lock
+	 * @param isDir True if this is a directory
+	 */
+	static void lockDownFile(const char *path,bool isDir);
+
+	/**
+	 * Get file last modification time
+	 *
+	 * Resolution is often only second, not millisecond, but the return is
+	 * always in ms for comparison against now().
+	 *
+	 * @param path Path to file to get time
+	 * @return Last modification time in ms since epoch or 0 if not found
+	 */
+	static uint64_t getLastModified(const char *path);
+
+	/**
+	 * @param path Path to check
+	 * @param followLinks Follow links (on platforms with that concept)
+	 * @return True if file or directory exists at path location
+	 */
+	static bool fileExists(const char *path,bool followLinks = true);
+
+	/**
+	 * @param path Path to file
+	 * @return File size or -1 if nonexistent or other failure
+	 */
+	static int64_t getFileSize(const char *path);
+
+	/**
+	 * @return Current time in milliseconds since epoch
+	 */
+	static inline uint64_t now()
+		throw()
+	{
+#ifdef __WINDOWS__
+		FILETIME ft;
+		SYSTEMTIME st;
+		ULARGE_INTEGER tmp;
+		GetSystemTime(&st);
+		SystemTimeToFileTime(&st,&ft);
+		tmp.LowPart = ft.dwLowDateTime;
+		tmp.HighPart = ft.dwHighDateTime;
+		return ( ((tmp.QuadPart - 116444736000000000ULL) / 10000L) + st.wMilliseconds );
+#else
+		struct timeval tv;
+		gettimeofday(&tv,(struct timezone *)0);
+		return ( (1000ULL * (uint64_t)tv.tv_sec) + (uint64_t)(tv.tv_usec / 1000) );
+#endif
+	};
+
+	/**
+	 * @return Current time in seconds since epoch, to the highest available resolution
+	 */
+	static inline double nowf()
+		throw()
+	{
+#ifdef __WINDOWS__
+		FILETIME ft;
+		SYSTEMTIME st;
+		ULARGE_INTEGER tmp;
+		GetSystemTime(&st);
+		SystemTimeToFileTime(&st,&ft);
+		tmp.LowPart = ft.dwLowDateTime;
+		tmp.HighPart = ft.dwHighDateTime;
+		return (((double)(tmp.QuadPart - 116444736000000000ULL)) / 10000000.0);
+#else
+		struct timeval tv;
+		gettimeofday(&tv,(struct timezone *)0);
+		return ( ((double)tv.tv_sec) + (((double)tv.tv_usec) / 1000000.0) );
+#endif
+	}
+
+	/**
+	 * Read the full contents of a file into a string buffer
+	 *
+	 * The buffer isn't cleared, so if it already contains data the file's data will
+	 * be appended.
+	 *
+	 * @param path Path of file to read
+	 * @param buf Buffer to fill
+	 * @return True if open and read successful
+	 */
+	static bool readFile(const char *path,std::string &buf);
+
+	/**
+	 * Write a block of data to disk, replacing any current file contents
+	 *
+	 * @param path Path to write
+	 * @param buf Buffer containing data
+	 * @param len Length of buffer
+	 * @return True if entire file was successfully written
+	 */
+	static bool writeFile(const char *path,const void *buf,unsigned int len);
+
+	/**
+	 * Write a block of data to disk, replacing any current file contents
+	 *
+	 * @param path Path to write
+	 * @param s Data to write
+	 * @return True if entire file was successfully written
+	 */
+	static inline bool writeFile(const char *path,const std::string &s)
+	{
+		return writeFile(path,s.data(),(unsigned int)s.length());
+	}
+};
+
+} // namespace ZeroTier
+
+#endif
+