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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
//
// A scoped Asio stream that is automatically closed by its destructor.
#ifndef OPENVPN_ASIO_SCOPED_ASIO_STREAM_H
#define OPENVPN_ASIO_SCOPED_ASIO_STREAM_H
#include <openvpn/common/size.hpp>
namespace openvpn {
template <typename STREAM>
class ScopedAsioStream
{
ScopedAsioStream(const ScopedAsioStream &) = delete;
ScopedAsioStream &operator=(const ScopedAsioStream &) = delete;
public:
typedef STREAM *base_type;
ScopedAsioStream()
: obj_(undefined())
{
}
explicit ScopedAsioStream(STREAM *obj)
: obj_(obj)
{
}
static STREAM *undefined()
{
return nullptr;
}
STREAM *release()
{
STREAM *ret = obj_;
obj_ = nullptr;
// OPENVPN_LOG("**** SAS RELEASE=" << ret);
return ret;
}
static bool defined_static(STREAM *obj)
{
return obj != nullptr;
}
bool defined() const
{
return defined_static(obj_);
}
STREAM *operator()() const
{
return obj_;
}
void reset(STREAM *obj)
{
close();
obj_ = obj;
// OPENVPN_LOG("**** SAS RESET=" << obj_);
}
// unusual semantics: replace obj without closing it first
void replace(STREAM *obj)
{
// OPENVPN_LOG("**** SAS REPLACE " << obj_ << " -> " << obj);
obj_ = obj;
}
// return false if close error
bool close()
{
if (defined())
{
// OPENVPN_LOG("**** SAS CLOSE obj=" << obj_);
delete obj_;
obj_ = nullptr;
}
return true;
}
~ScopedAsioStream()
{
// OPENVPN_LOG("**** SAS DESTRUCTOR");
close();
}
private:
STREAM *obj_;
};
} // namespace openvpn
#endif
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