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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 netifaces import interfaces
from vyos.config import Config
from vyos.template import render
from vyos.util import chown, chmod_755, cmd, call
from vyos.validate import is_bridge_member
from vyos import ConfigError
default_config_data = {
'address': [],
'apn': '',
'chat_script': '',
'deleted': False,
'description': '',
'device': 'ttyUSB0',
'disable': False,
'disable_link_detect': 1,
'on_demand': False,
'logfile': '',
'metric': '10',
'mtu': '1500',
'name_server': True,
'is_bridge_member': False,
'intf': '',
'vrf': ''
}
def check_kmod():
modules = ['option', 'usb_wwan', 'usbserial']
for module in modules:
if not os.path.exists(f'/sys/module/{module}'):
if call(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"
wwan['chat_script'] = f"/etc/ppp/peers/chat.{wwan['intf']}"
# Check if interface has been removed
if not conf.exists('interfaces wirelessmodem ' + wwan['intf']):
wwan['deleted'] = True
# check if interface is member if a bridge
wwan['is_bridge_member'] = is_bridge_member(conf, wwan['intf'])
return wwan
# set new configuration level
conf.set_level('interfaces wirelessmodem ' + wwan['intf'])
# get metrick for backup default route
if conf.exists(['apn']):
wwan['apn'] = conf.return_value(['apn'])
# 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'])
# disable interface
if conf.exists('disable'):
wwan['disable'] = True
# 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(['no-peer-dns']):
wwan['name_server'] = False
# Access concentrator name (only connect to this concentrator)
if conf.exists(['ondemand']):
wwan['on_demand'] = True
# retrieve VRF instance
if conf.exists('vrf'):
wwan['vrf'] = conf.return_value(['vrf'])
return wwan
def verify(wwan):
if wwan['deleted']:
if wwan['is_bridge_member']::
interface = wwan['intf']
bridge = wwan['is_bridge_member']
raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
return None
if not wwan['apn']:
raise ConfigError(f"APN for {wwan['intf']} not configured")
# we can not use isfile() here as Linux device files are no regular files
# thus the check will return False
if not os.path.exists(f"/dev/{wwan['device']}"):
raise ConfigError(f"Device {wwan['device']} does not exist")
vrf_name = wwan['vrf']
if vrf_name and vrf_name not in interfaces():
raise ConfigError(f'VRF {vrf_name} does not exist')
return None
def generate(wwan):
# set up configuration file path variables where our templates will be
# rendered into
intf = wwan['intf']
config_wwan = f'/etc/ppp/peers/{intf}'
config_wwan_chat = wwan['chat_script']
script_wwan_pre_up = f'/etc/ppp/ip-pre-up.d/1010-vyos-wwan-{intf}'
script_wwan_ip_up = f'/etc/ppp/ip-up.d/1010-vyos-wwan-{intf}'
script_wwan_ip_down = f'/etc/ppp/ip-down.d/1010-vyos-wwan-{intf}'
config_files = [config_wwan, config_wwan_chat, script_wwan_pre_up,
script_wwan_ip_up, script_wwan_ip_down]
# Ensure directories for config files exist - otherwise create them on demand
for file in config_files:
dirname = os.path.dirname(file)
if not os.path.isdir(dirname):
os.mkdir(dirname)
# Always hang-up WWAN connection prior generating new configuration file
cmd(f'systemctl stop ppp@{intf}.service')
if wwan['deleted']:
# Delete PPP configuration files
for file in config_files:
if os.path.exists(file):
os.unlink(file)
else:
# Create PPP configuration files
render(config_wwan, 'wwan/peer.tmpl', wwan)
# Create PPP chat script
render(config_wwan_chat, 'wwan/chat.tmpl', wwan)
# Create script for ip-pre-up.d
render(script_wwan_pre_up, 'wwan/ip-pre-up.script.tmpl', wwan)
# Create script for ip-up.d
render(script_wwan_ip_up, 'wwan/ip-up.script.tmpl', wwan)
# Create script for ip-down.d
render(script_wwan_ip_down, 'wwan/ip-down.script.tmpl', wwan)
# make generated script file executable
chmod_755(script_wwan_pre_up)
chmod_755(script_wwan_ip_up)
chmod_755(script_wwan_ip_down)
return None
def apply(wwan):
if wwan['deleted']:
# bail out early
return None
if not wwan['disable']:
# "dial" WWAN connection
intf = wwan['intf']
cmd(f'systemctl start ppp@{intf}.service')
# make logfile owned by root / vyattacfg
chown(wwan['logfile'], 'root', 'vyattacfg')
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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