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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
//
#pragma once
#include <string>
#include <openvpn/common/platform.hpp>
#if !defined(OPENVPN_PLATFORM_WIN)
#include <sys/types.h> // for open(), ftruncate()
#include <sys/stat.h> // for open()
#include <fcntl.h> // for open()
#include <unistd.h> // for write(), ftruncate()
#include <errno.h>
#endif
#include <openvpn/common/exception.hpp>
#include <openvpn/common/size.hpp>
#include <openvpn/buffer/buffer.hpp>
#if !defined(OPENVPN_PLATFORM_WIN)
#include <openvpn/common/scoped_fd.hpp>
#include <openvpn/common/write.hpp>
#include <openvpn/common/strerror.hpp>
#endif
namespace openvpn {
#if defined(OPENVPN_PLATFORM_WIN)
inline void write_private(const std::string &path, const void *buf, size_t count)
{
OPENVPN_THROW_EXCEPTION("write_private('" << path << "') : not implemented on Windows yet");
}
#else
inline void write_private(const std::string &path, const void *buf, ssize_t count)
{
ScopedFD fd(::open(path.c_str(), O_WRONLY | O_CREAT | O_CLOEXEC, S_IRUSR | S_IWUSR));
if (!fd.defined())
{
const int eno = errno;
OPENVPN_THROW_EXCEPTION(path << " : open error : " << strerror_str(eno));
}
if (::ftruncate(fd(), 0) < 0)
{
const int eno = errno;
OPENVPN_THROW_EXCEPTION(path << " : truncate error : " << strerror_str(eno));
}
const ssize_t len = write_retry(fd(), buf, count);
if (len == -1)
{
const int eno = errno;
OPENVPN_THROW_EXCEPTION(path << " : write error : " << strerror_str(eno));
}
else if (len != count)
OPENVPN_THROW_EXCEPTION(path << " : unexpected write size");
if (!fd.close())
{
const int eno = errno;
OPENVPN_THROW_EXCEPTION(path << " : close error : " << strerror_str(eno));
}
}
#endif
inline void write_private(const std::string &path, const Buffer &buf)
{
write_private(path, buf.c_data(), buf.size());
}
inline void write_private(const std::string &path, const std::string &str)
{
write_private(path, str.c_str(), str.length());
}
} // namespace openvpn
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