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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
# To run this program, the file ``ssh_host_key`` must exist with an SSH
# private key in it to use as a server host key. An SSH host certificate
# can optionally be provided in the file ``ssh_host_key-cert.pub``.
#
# The file ``ssh_user_ca`` must exist with a cert-authority entry of
# the certificate authority which can sign valid client certificates.
import asyncio, asyncssh, sys
async def handle_client(process: asyncssh.SSHServerProcess) -> None:
width, height, pixwidth, pixheight = process.term_size
process.stdout.write(f'Terminal type: {process.term_type}, '
f'size: {width}x{height}')
if pixwidth and pixheight:
process.stdout.write(f' ({pixwidth}x{pixheight} pixels)')
process.stdout.write('\nTry resizing your window!\n')
while not process.stdin.at_eof():
try:
await process.stdin.read()
except asyncssh.TerminalSizeChanged as exc:
process.stdout.write(f'New window size: {exc.width}x{exc.height}')
if exc.pixwidth and exc.pixheight:
process.stdout.write(f' ({exc.pixwidth}'
f'x{exc.pixheight} pixels)')
process.stdout.write('\n')
async def start_server() -> None:
await asyncssh.listen('', 8022, server_host_keys=['ssh_host_key'],
authorized_client_keys='ssh_user_ca',
process_factory=handle_client)
loop = asyncio.new_event_loop()
try:
loop.run_until_complete(start_server())
except (OSError, asyncssh.Error) as exc:
sys.exit('Error starting server: ' + str(exc))
loop.run_forever()
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