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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
//
//
#ifndef OPENVPN_WIN_EVENT_H
#define OPENVPN_WIN_EVENT_H
#include <windows.h>
#include <string>
#include <openvpn/buffer/bufhex.hpp>
#include <openvpn/win/winerr.hpp>
#include <openvpn/win/scoped_handle.hpp>
namespace openvpn::Win {
// Wrap a standard Windows Event object
class Event
{
public:
explicit Event(BOOL manual_reset = TRUE)
{
event.reset(::CreateEvent(NULL, manual_reset, FALSE, NULL));
if (!event.defined())
{
const Win::LastError err;
OPENVPN_THROW_EXCEPTION("Win::Event: cannot create Windows event: " << err.message());
}
}
std::string duplicate_local()
{
HANDLE new_handle;
if (!::DuplicateHandle(GetCurrentProcess(),
event(),
GetCurrentProcess(),
&new_handle,
0,
FALSE,
DUPLICATE_SAME_ACCESS))
{
const Win::LastError err;
OPENVPN_THROW_EXCEPTION("Win::Event: DuplicateHandle failed: " << err.message());
}
return BufHex::render(new_handle);
}
void signal_event()
{
if (event.defined())
{
::SetEvent(event());
event.close();
}
}
void release_event()
{
event.close();
}
HANDLE operator()() const
{
return event();
}
void reset(HANDLE h)
{
event.reset(h);
}
private:
ScopedHANDLE event;
};
// Windows event object that automatically signals in the destructor
struct DestroyEvent : public Event
{
~DestroyEvent()
{
signal_event();
}
};
} // namespace openvpn::Win
#endif
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