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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/>.
#pragma once
#include <openvpn/common/jsonhelper.hpp>
#include <openvpn/common/fileatomic.hpp>
namespace openvpn {
namespace json {
inline Json::Value read_fast(const std::string &fn,
const bool optional = true,
std::uint64_t *mtime_ns = nullptr)
{
BufferPtr bp = read_binary_unix(fn, 0, optional ? NULL_ON_ENOENT : 0, mtime_ns);
if (!bp || bp->empty())
return Json::Value();
return parse_from_buffer(*bp, fn);
}
inline Json::Value read_fast_dict(const std::string &fn,
const bool optional = true,
std::uint64_t *mtime_ns = nullptr)
{
Json::Value jret = read_fast(fn, optional, mtime_ns);
if (!jret)
return jret;
if (!jret.isObject())
throw json_parse("read_fast_dict: json file " + fn + " does not contain a top-level dictionary");
return jret;
}
inline void write_atomic(const std::string &fn,
const std::string &tmpdir,
const mode_t mode,
const std::uint64_t mtime_ns, // set explicit modification-time in nanoseconds since epoch, or 0 to defer to system
const Json::Value &root,
const size_t size_hint,
StrongRandomAPI &rng)
{
BufferPtr bp = new BufferAllocated(size_hint, BufferAllocated::GROW);
format_compact(root, *bp);
write_binary_atomic(fn, tmpdir, mode, mtime_ns, *bp, rng);
}
inline void write_fast(const std::string &fn,
const mode_t mode,
const std::uint64_t mtime_ns, // set explicit modification-time in nanoseconds since epoch, or 0 to defer to system
const Json::Value &root,
const size_t size_hint)
{
BufferPtr bp = new BufferAllocated(size_hint, BufferAllocated::GROW);
format_compact(root, *bp);
write_binary_unix(fn, mode, mtime_ns, *bp);
}
} // namespace json
} // namespace openvpn
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