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service_console-server.py
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service_console-server.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from psutil import process_iter
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.template import render
from vyos.util import call
from vyos.xml import defaults
from vyos import ConfigError
config_file = '/run/conserver/conserver.cf'
dropbear_systemd_file = '/etc/systemd/system/dropbear@{port}.service.d/override.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'console-server']
# Retrieve CLI representation as dictionary
proxy = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True)
# The retrieved dictionary will look something like this:
#
# {'device': {'usb0b2.4p1.0': {'speed': '9600'},
# 'usb0b2.4p1.1': {'data_bits': '8',
# 'parity': 'none',
# 'speed': '115200',
# 'stop_bits': '2'}}}
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base + ['device'])
if 'device' in proxy:
for device in proxy['device']:
tmp = dict_merge(default_values, proxy['device'][device])
proxy['device'][device] = tmp
return proxy
def verify(proxy):
if not proxy:
return None
processes = process_iter(['name', 'cmdline'])
if 'device' in proxy:
for device, device_config in proxy['device'].items():
for process in processes:
if 'agetty' in process.name() and device in process.cmdline():
raise ConfigError(f'Port "{device}" already provides a '\
'console used by "system console"!')
if 'speed' not in device_config:
raise ConfigError(f'Port "{device}" requires speed to be set!')
if 'ssh' in device_config and 'port' not in device_config['ssh']:
raise ConfigError(f'Port "{device}" requires SSH port to be set!')
return None
def generate(proxy):
if not proxy:
return None
render(config_file, 'conserver/conserver.conf.tmpl', proxy)
if 'device' in proxy:
for device, device_config in proxy['device'].items():
if 'ssh' not in device_config:
continue
tmp = {
'device' : device,
'port' : device_config['ssh']['port'],
}
render(dropbear_systemd_file.format(**tmp),
'conserver/dropbear@.service.tmpl', tmp)
return None
def apply(proxy):
call('systemctl daemon-reload')
call('systemctl stop dropbear@*.service conserver-server.service')
if not proxy:
if os.path.isfile(config_file):
os.unlink(config_file)
return None
call('systemctl restart conserver-server.service')
if 'device' in proxy:
for device, device_config in proxy['device'].items():
if 'ssh' not in device_config:
continue
port = device_config['ssh']['port']
call(f'systemctl restart dropbear@{port}.service')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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