"""
This module contains the backend implementing the Protun protocol.


Copyright (c) 2026 Proton AG

This file is part of Proton VPN.

Proton VPN is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Proton VPN 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
"""
from .protun import ProtunAuto, ProtunUDP, ProtunTCP, ProtunTLS


def register(registry):
    """Registers the Protun protocol implementations in the given registry."""
    registry.register(ProtunUDP)
    registry.register(ProtunTCP)
    registry.register(ProtunTLS)
    registry.register(ProtunAuto)


__all__ = ["register"]
