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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
//
// console utilities for Windows
#ifndef OPENVPN_WIN_CONSOLE_H
#define OPENVPN_WIN_CONSOLE_H
#include <windows.h>
#include <string>
#include <openvpn/win/handle.hpp>
namespace openvpn::Win::Console {
class Input
{
Input(const Input &) = delete;
Input &operator=(const Input &) = delete;
public:
Input(bool password)
: std_input(Handle::undefined()),
console_mode_save(0)
{
// disable control-C
::SetConsoleCtrlHandler(nullptr, TRUE);
HANDLE in = ::GetStdHandle(STD_INPUT_HANDLE);
DWORD mode = 0;
if (Handle::defined(in) && ::GetConsoleMode(in, &mode))
{
// running on a console
DWORD newmode = mode
& ~(ENABLE_WINDOW_INPUT
| ENABLE_ECHO_INPUT
| ENABLE_MOUSE_INPUT);
if (!password)
{
newmode &= ~(ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT);
}
if (newmode == mode || ::SetConsoleMode(in, newmode))
{
std_input = in;
console_mode_save = mode;
}
}
}
~Input()
{
if (Handle::defined(std_input))
::SetConsoleMode(std_input, console_mode_save);
}
bool available()
{
if (Handle::defined(std_input))
{
DWORD n;
if (::GetNumberOfConsoleInputEvents(std_input, &n))
return n > 0;
}
return false;
}
std::string get_password(const std::string &prompt)
{
std::cout << prompt;
std::string s;
std::getline(std::cin, s);
std::cout << std::endl;
return s;
}
unsigned int get()
{
if (Handle::defined(std_input))
{
INPUT_RECORD ir;
do
{
DWORD n;
if (!available())
return 0;
if (!::ReadConsoleInputA(std_input, &ir, 1, &n))
return 0;
} while (ir.EventType != KEY_EVENT || ir.Event.KeyEvent.bKeyDown != TRUE);
return keyboard_ir_to_key(&ir);
}
else
return 0;
}
private:
unsigned int keyboard_ir_to_key(INPUT_RECORD *ir)
{
if (ir->Event.KeyEvent.uChar.AsciiChar == 0)
return ir->Event.KeyEvent.wVirtualScanCode;
if ((ir->Event.KeyEvent.dwControlKeyState
& (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
&& (ir->Event.KeyEvent.wVirtualKeyCode != 18))
return ir->Event.KeyEvent.wVirtualScanCode * 256;
return ir->Event.KeyEvent.uChar.AsciiChar;
}
HANDLE std_input;
DWORD console_mode_save;
};
class Title
{
Title(const Title &) = delete;
Title &operator=(const Title &) = delete;
public:
Title(const std::string &new_title)
: old_title_defined(false)
{
char title[256];
if (::GetConsoleTitleA(title, sizeof(title)))
{
old_title = title;
old_title_defined = true;
}
::SetConsoleTitleA(new_title.c_str());
}
~Title()
{
if (old_title_defined)
::SetConsoleTitleA(old_title.c_str());
}
private:
bool old_title_defined;
std::string old_title;
};
} // namespace openvpn::Win::Console
#endif
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