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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 <errno.h>
#include <sys/time.h>
#include <sys/stat.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()); }
static inline bool mkdir(const char *path)
throw()
{
if (::mkdir(path,0755) != 0)
return (errno == EEXIST);
return true;
}
static inline bool mkdir(const std::string &path) throw() { return OSUtils::mkdir(path.c_str()); }
/**
* List a directory's contents
*
* This returns only files, not sub-directories.
*
* @param path Path to list
* @return Names of files in directory
*/
static std::vector<std::string> 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
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