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interfaces-wirelessmodem.py
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interfaces-wirelessmodem.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020 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 copy import deepcopy
from jinja2 import Template
from subprocess import Popen, PIPE
from pwd import getpwnam
from grp import getgrnam
from vyos.config import Config
from vyos import ConfigError
# Please be careful if you edit the template.
config_wwan_tmpl = """### Autogenerated by interfaces-wirelessmodem.py ###
{% if description %}
# {{ description }}
{% endif %}
ipparam {{ intf }} {{ metric }}
{% if on_demand -%}
demand
{%- endif %}
{% if name_server -%}
usepeerdns
{%- endif %}
logfile {{ logfile }}
linkname {{ intf }}
lcp-echo-failure 0
115200
debug
nodefaultroute
ipcp-max-failure 4
ipcp-accept-local
ipcp-accept-remote
noauth
crtscts
lock
persist
"""
default_config_data = {
'address': [],
'deleted': False,
'description': '',
'device': 'ttyUSB0',
'disable': False,
'disable_link_detect': 1,
'on_demand': False,
'logfile': '',
'metric': '10',
'mtu': '1500',
'name_server': True,
'network': 'att',
'intf': ''
}
def subprocess_cmd(command):
p = Popen(command, stdout=PIPE, shell=True)
p.communicate()
def check_kmod():
modules = ['option', 'usb_wwan', 'usbserial']
for module in modules:
if not os.path.exists(f'/sys/module/{module}'):
if os.system(f'modprobe {module}') != 0:
raise ConfigError(f'Loading Kernel module {module} failed')
def get_config():
wwan = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
if 'VYOS_TAGNODE_VALUE' not in os.environ:
raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
wwan['intf'] = os.environ['VYOS_TAGNODE_VALUE']
wwan['logfile'] = f"/var/log/vyatta/ppp_{wwan['intf']}.log"
# Check if interface has been removed
if not conf.exists('interfaces wirelessmodem ' + wwan['intf']):
wwan['deleted'] = True
return wwan
# set new configuration level
conf.set_level('interfaces wirelessmodem ' + wwan['intf'])
# get metrick for backup default route
if conf.exists(['backup', 'distance']):
wwan['metric'] = conf.return_value(['backup', 'distance'])
# Retrieve interface description
if conf.exists(['description']):
wwan['description'] = conf.return_value(['description'])
# System device name
if conf.exists(['device']):
wwan['device'] = conf.return_value(['device'])
# ignore link state changes
if conf.exists('disable-link-detect'):
wwan['disable_link_detect'] = 2
# Do not use DNS servers provided by the peer
if conf.exists(['mtu']):
wwan['mtu'] = conf.return_value(['mtu'])
# Do not use DNS servers provided by the peer
if conf.exists(['network']):
wwan['network'] = conf.return_value(['network'])
# Do not use DNS servers provided by the peer
if conf.exists(['no-dns']):
wwan['name_server'] = False
# Access concentrator name (only connect to this concentrator)
if conf.exists(['ondemand']):
wwan['on_demand'] = True
return wwan
def verify(wwan):
if wwan is None:
return None
return None
def generate(wwan):
config_file_wwan = f"/etc/ppp/peers/{wwan['intf']}"
# Always hang-up WWAN connection prior generating new configuration file
cmd = f"systemctl stop ppp@{wwan['intf']}.service"
subprocess_cmd(cmd)
if wwan['deleted']:
# Delete PPP configuration files
if os.path.exists(config_file_wwan):
os.unlink(config_file_wwan)
else:
# Create PPP configuration files
tmpl = Template(config_wwan_tmpl)
config_text = tmpl.render(wwan)
with open(config_file_wwan, 'w') as f:
f.write(config_text)
return None
def apply(wwan):
if wwan['deleted']:
# bail out early
return None
if not wwan['disable']:
# dial WWAN connection
cmd = f"systemctl start ppp@{wwan['intf']}.service"
subprocess_cmd(cmd)
# make logfile owned by root / vyattacfg
if os.path.isfile(wwan['logfile']):
uid = getpwnam('root').pw_uid
gid = getgrnam('vyattacfg').gr_gid
os.chown(wwan['logfile'], uid, gid)
return None
if __name__ == '__main__':
try:
check_kmod()
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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