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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_COMMON_STAT_H
#define OPENVPN_COMMON_STAT_H
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <cstdint> // for std::uint64_t
namespace openvpn {
// Return true if file exists
inline bool file_exists(const std::string &filename)
{
if (filename.empty())
return false;
struct stat buffer;
return ::stat(filename.c_str(), &buffer) == 0;
}
/**
* Check if file exists AND is nonempty.
*
* @param filename File to check.
* @return true if file exists AND is nonempty.
*/
inline bool file_exists_nonempty(const std::string &filename)
{
if (filename.empty())
return false;
struct stat s;
if (::stat(filename.c_str(), &s) != 0)
return false;
return s.st_size > 0;
}
// Return true if dirname is a directory
inline bool is_directory(const std::string &pathname, const bool follow_symlinks = false)
{
if (pathname.empty())
return false;
struct stat sb;
if (follow_symlinks)
return ::stat(pathname.c_str(), &sb) == 0 && S_ISDIR(sb.st_mode);
else
return ::lstat(pathname.c_str(), &sb) == 0 && S_ISDIR(sb.st_mode);
}
// Return file modification time (in seconds since unix epoch) or 0 on error
inline time_t file_mod_time(const std::string &filename)
{
struct stat buffer;
if (::stat(filename.c_str(), &buffer) != 0)
return 0;
else
return buffer.st_mtime;
}
// Return file modification time from a struct stat
inline std::uint64_t stat_mod_time_nanoseconds(const struct stat &s)
{
typedef std::uint64_t T;
#if defined(__APPLE__)
return T(s.st_mtimespec.tv_sec) * T(1000000000) + T(s.st_mtimespec.tv_nsec);
#else
return T(s.st_mtim.tv_sec) * T(1000000000) + T(s.st_mtim.tv_nsec);
#endif
}
// Return file modification time from a file path (in nanoseconds since unix epoch) or 0 on error
inline std::uint64_t file_mod_time_nanoseconds(const char *filename)
{
struct stat s;
if (::stat(filename, &s) == 0)
return stat_mod_time_nanoseconds(s);
else
return 0;
}
// Return file modification time from a file path (in nanoseconds since unix epoch) or 0 on error
inline std::uint64_t file_mod_time_nanoseconds(const std::string &filename)
{
return file_mod_time_nanoseconds(filename.c_str());
}
// Return file modification time from a file descriptor (in nanoseconds since unix epoch) or 0 on error
inline std::uint64_t fd_mod_time_nanoseconds(const int fd)
{
struct stat s;
if (::fstat(fd, &s) == 0)
return stat_mod_time_nanoseconds(s);
else
return 0;
}
// Return file modification time (in milliseconds since unix epoch) or 0 on error
inline std::uint64_t file_mod_time_milliseconds(const std::string &filename)
{
return file_mod_time_nanoseconds(filename) / std::uint64_t(1000000);
}
} // namespace openvpn
#endif
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