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#!/usr/bin/env python3.7
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#
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# Copyright (c) 2013-2024 by Ron Frederick <ronf@timeheart.net> and others.
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#
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# This program and the accompanying materials are made available under
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# the terms of the Eclipse Public License v2.0 which accompanies this
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# distribution and is available at:
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#
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# http://www.eclipse.org/legal/epl-2.0/
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#
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# This program may also be made available under the following secondary
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# licenses when the conditions for such availability set forth in the
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# Eclipse Public License v2.0 are satisfied:
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#
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# GNU General Public License, Version 2.0, or any later versions of
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# that license
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#
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# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
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#
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# Contributors:
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# Ron Frederick - initial implementation, API, and documentation
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# To run this program, the file ``ssh_host_key`` must exist with an SSH
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# private key in it to use as a server host key. An SSH host certificate
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# can optionally be provided in the file ``ssh_host_key-cert.pub``.
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#
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# The file ``ssh_user_ca`` must exist with a cert-authority entry of
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# the certificate authority which can sign valid client certificates.
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import asyncio
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import sys
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import asyncssh
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async def handle_client(process: asyncssh.SSHServerProcess) -> None:
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width, height, pixwidth, pixheight = process.term_size
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process.stdout.write(
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f"Terminal type: {process.term_type}, " f"size: {width}x{height}"
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)
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if pixwidth and pixheight:
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process.stdout.write(f" ({pixwidth}x{pixheight} pixels)")
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process.stdout.write("\nTry resizing your window!\n")
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while not process.stdin.at_eof():
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try:
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await process.stdin.read()
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except asyncssh.TerminalSizeChanged as exc:
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process.stdout.write(f"New window size: {exc.width}x{exc.height}")
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if exc.pixwidth and exc.pixheight:
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process.stdout.write(f" ({exc.pixwidth}" f"x{exc.pixheight} pixels)")
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process.stdout.write("\n")
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async def start_server() -> None:
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await asyncssh.listen(
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"",
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2230,
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server_host_keys=["ssh_host_key"],
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# authorized_client_keys='ssh_user_ca',
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process_factory=handle_client,
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)
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loop = asyncio.new_event_loop()
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try:
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loop.run_until_complete(start_server())
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except (OSError, asyncssh.Error) as exc:
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sys.exit("Error starting server: " + str(exc))
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loop.run_forever()
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