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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) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// General-purpose methods for handling filesystem pathnames
#ifndef OPENVPN_COMMON_PATH_H
#define OPENVPN_COMMON_PATH_H
#include <string>
#include <openvpn/common/size.hpp>
#include <openvpn/common/platform.hpp>
#include <openvpn/common/string.hpp>
namespace openvpn {
namespace path {
// Directory separators. The first char in dirsep is the primary
// separator for the platform, while subsequent chars are also
// recognized as separators.
namespace {
#if defined(OPENVPN_PLATFORM_WIN) || defined(OPENVPN_PATH_SIMULATE_WINDOWS)
// Windows
const char dirsep[] = "\\/"; // CONST GLOBAL
#else
// Unix
const char dirsep[] = "/\\"; // CONST GLOBAL
#endif
} // namespace
// true if char is a directory separator
inline bool is_dirsep(const char c)
{
for (const char *p = dirsep; *p != '\0'; ++p)
if (c == *p)
return true;
return false;
}
inline bool win_dev(const std::string &path, const bool fully_qualified)
{
#if defined(OPENVPN_PLATFORM_WIN) || defined(OPENVPN_PATH_SIMULATE_WINDOWS)
// Identify usage such as "c:\\".
return path.length() >= 3
&& ((path[0] >= 'a' && path[0] <= 'z') || (path[0] >= 'A' && path[0] <= 'Z'))
&& path[1] == ':'
&& (!fully_qualified || is_dirsep(path[2]));
#else
return false;
#endif
}
// true if path is fully qualified
inline bool is_fully_qualified(const std::string &path)
{
return win_dev(path, true) || (path.length() > 0 && is_dirsep(path[0]));
}
// does path refer to regular file without directory traversal
inline bool is_flat(const std::string &path)
{
return path.length() > 0
&& path != "."
&& path != ".."
&& path.find_first_of(dirsep) == std::string::npos
&& !win_dev(path, false);
}
inline std::string basename(const std::string &path)
{
const size_t pos = path.find_last_of(dirsep);
if (pos != std::string::npos)
{
const size_t p = pos + 1;
if (p >= path.length())
return "";
else
return path.substr(p);
}
else
return path;
}
inline std::string dirname(const std::string &path)
{
const size_t pos = path.find_last_of(dirsep);
if (pos != std::string::npos)
{
if (pos == 0)
return "/";
else
return path.substr(0, pos);
}
else
return "";
}
// return true if path is a regular file that doesn't try to traverse via ".." or "/..."
inline bool is_contained(const std::string &path)
{
if (path.empty())
return false;
if (win_dev(path, false))
return false;
if (is_dirsep(path[0]))
return false;
// look for ".." in path
enum State
{
SEP, // immediately after separator
MID, // middle of dir
DOT_2, // looking for second '.'
POST_DOT_2, // after ".."
};
State state = SEP;
for (const auto c : path)
{
switch (state)
{
case SEP:
if (c == '.')
state = DOT_2;
else if (!is_dirsep(c))
state = MID;
break;
case MID:
if (is_dirsep(c))
state = SEP;
break;
case DOT_2:
if (c == '.')
state = POST_DOT_2;
else if (is_dirsep(c))
state = SEP;
else
state = MID;
break;
case POST_DOT_2:
if (is_dirsep(c))
return false;
state = MID;
break;
}
}
return state != POST_DOT_2;
}
inline std::string ext(const std::string &basename)
{
const size_t pos = basename.find_last_of('.');
if (pos != std::string::npos)
{
const size_t p = pos + 1;
if (p >= basename.length())
return "";
else
return basename.substr(p);
}
else
return "";
}
inline std::string root(const std::string &basename)
{
const size_t pos = basename.find_last_of('.');
if (pos != std::string::npos)
return basename.substr(0, pos);
else
return basename;
}
inline std::string join(const std::string &p1, const std::string &p2)
{
if (p1.empty() || is_fully_qualified(p2))
return p2;
else
return string::add_trailing_copy(p1, dirsep[0]) + p2;
}
template <typename... Args>
inline std::string join(const std::string &p1, const std::string &p2, Args... args)
{
return join(join(p1, p2), args...);
}
} // namespace path
} // namespace openvpn
#endif // OPENVPN_COMMON_STRING_H
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