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interfaces-pppoe.py
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interfaces-pppoe.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2021 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 copy import deepcopy
from netifaces import interfaces
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configdict import leaf_node_changed
from vyos.configverify import verify_authentication
from vyos.configverify import verify_source_interface
from vyos.configverify import verify_interface_exists
from vyos.configverify import verify_vrf
from vyos.configverify import verify_mtu_ipv6
from vyos.ifconfig import PPPoEIf
from vyos.template import render
from vyos.util import call
from vyos.util import is_systemd_service_running
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'pppoe']
pppoe = get_interface_dict(conf, base)
# We should only terminate the PPPoE session if critical parameters change.
# All parameters that can be changed on-the-fly (like interface description)
# should not lead to a reconnect!
tmp = leaf_node_changed(conf, ['access-concentrator'])
if tmp: pppoe.update({'shutdown_required': {}})
tmp = leaf_node_changed(conf, ['connect-on-demand'])
if tmp: pppoe.update({'shutdown_required': {}})
tmp = leaf_node_changed(conf, ['service-name'])
if tmp: pppoe.update({'shutdown_required': {}})
tmp = leaf_node_changed(conf, ['source-interface'])
if tmp: pppoe.update({'shutdown_required': {}})
tmp = leaf_node_changed(conf, ['vrf'])
# leaf_node_changed() returns a list, as VRF is a non-multi node, there
# will be only one list element
if tmp: pppoe.update({'vrf_old': tmp[0]})
tmp = leaf_node_changed(conf, ['authentication', 'user'])
if tmp: pppoe.update({'shutdown_required': {}})
tmp = leaf_node_changed(conf, ['authentication', 'password'])
if tmp: pppoe.update({'shutdown_required': {}})
return pppoe
def verify(pppoe):
if 'deleted' in pppoe:
# bail out early
return None
verify_source_interface(pppoe)
verify_authentication(pppoe)
verify_vrf(pppoe)
verify_mtu_ipv6(pppoe)
if {'connect_on_demand', 'vrf'} <= set(pppoe):
raise ConfigError('On-demand dialing and VRF can not be used at the same time')
return None
def generate(pppoe):
# set up configuration file path variables where our templates will be
# rendered into
ifname = pppoe['ifname']
config_pppoe = f'/etc/ppp/peers/{ifname}'
if 'deleted' in pppoe or 'disable' in pppoe:
if os.path.exists(config_pppoe):
os.unlink(config_pppoe)
return None
# Create PPP configuration files
render(config_pppoe, 'pppoe/peer.tmpl', pppoe, permission=0o640)
return None
def apply(pppoe):
ifname = pppoe['ifname']
if 'deleted' in pppoe or 'disable' in pppoe:
if os.path.isdir(f'/sys/class/net/{ifname}'):
p = PPPoEIf(ifname)
p.remove()
call(f'systemctl stop ppp@{ifname}.service')
return None
# reconnect should only be necessary when certain config options change,
# like ACS name, authentication, no-peer-dns, source-interface
if ((not is_systemd_service_running(f'ppp@{ifname}.service')) or
'shutdown_required' in pppoe):
# cleanup system (e.g. FRR routes first)
if os.path.isdir(f'/sys/class/net/{ifname}'):
p = PPPoEIf(ifname)
p.remove()
call(f'systemctl restart ppp@{ifname}.service')
else:
if os.path.isdir(f'/sys/class/net/{ifname}'):
p = PPPoEIf(ifname)
p.update(pppoe)
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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