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#!/usr/bin/env python3.7
#
# Copyright (c) 2013-2024 by Ron Frederick <ronf@timeheart.net> and others.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v2.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-2.0/
#
# This program may also be made available under the following secondary
# licenses when the conditions for such availability set forth in the
# Eclipse Public License v2.0 are satisfied:
#
# GNU General Public License, Version 2.0, or any later versions of
# that license
#
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
import asyncio, asyncssh, sys
from functools import partial
from typing import Awaitable
def connection_requested(conn: asyncssh.SSHClientConnection, orig_host: str,
orig_port: int) -> Awaitable[asyncssh.SSHForwarder]:
if orig_host in ('127.0.0.1', '::1'):
return conn.forward_connection('localhost', 80)
else:
raise asyncssh.ChannelOpenError(
asyncssh.OPEN_ADMINISTRATIVELY_PROHIBITED,
'Connections only allowed from localhost')
async def run_client() -> None:
async with asyncssh.connect('localhost') as conn:
listener = await conn.create_server(
partial(connection_requested, conn), '', 8080)
await listener.wait_closed()
try:
asyncio.run(run_client())
except (OSError, asyncssh.Error) as exc:
sys.exit('SSH connection failed: ' + str(exc))
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