1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#!/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
class MySSHServerSession(asyncssh.SSHServerSession):
def __init__(self):
self._input = ''
self._total = 0
def connection_made(self, chan: asyncssh.SSHServerChannel):
self._chan = chan
def shell_requested(self) -> bool:
return True
def session_started(self) -> None:
self._chan.write('Enter numbers one per line, or EOF when done:\n')
def data_received(self, data: str, datatype: asyncssh.DataType) -> None:
self._input += data
lines = self._input.split('\n')
for line in lines[:-1]:
try:
if line:
self._total += int(line)
except ValueError:
self._chan.write_stderr(f'Invalid number: {line}\n')
self._input = lines[-1]
def eof_received(self) -> bool:
self._chan.write(f'Total = {self._total}\n')
self._chan.exit(0)
return False
def break_received(self, msec: int) -> bool:
return self.eof_received()
def soft_eof_received(self) -> None:
self.eof_received()
class MySSHServer(asyncssh.SSHServer):
def session_requested(self) -> asyncssh.SSHServerSession:
return MySSHServerSession()
async def start_server() -> None:
await asyncssh.create_server(MySSHServer, '', 8022,
server_host_keys=['ssh_host_key'],
authorized_client_keys='ssh_user_ca')
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()
|
