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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/>.
#ifndef OPENVPN_COMMON_ENUMDIR_H
#define OPENVPN_COMMON_ENUMDIR_H
#include <sys/types.h>
#include <dirent.h>
#include <string>
#include <vector>
#include <utility>
#include <memory>
#include <algorithm>
#include <functional>
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/uniqueptr.hpp>
namespace openvpn {
OPENVPN_EXCEPTION(enum_dir_error);
template <typename F>
inline bool enum_dir(const std::string &dirname,
F func)
{
unique_ptr_del<DIR> dir(::opendir(dirname.c_str()), [](DIR *d)
{ ::closedir(d); });
if (!dir)
return false;
struct dirent *e;
while ((e = ::readdir(dir.get())) != nullptr)
{
std::string fn(e->d_name);
if (fn != "." && fn != "..")
std::invoke(func, std::move(fn));
}
return true;
}
inline std::vector<std::string> enum_dir(const std::string &dirname,
const size_t size_hint = 0,
const bool sort = false)
{
std::vector<std::string> ret;
if (size_hint)
ret.reserve(size_hint);
if (!enum_dir(dirname, [&ret](std::string fn)
{ ret.push_back(std::move(fn)); }))
throw enum_dir_error(dirname + ": cannot open directory");
if (sort)
std::sort(ret.begin(), ret.end());
return ret;
}
} // namespace openvpn
#endif
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