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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 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 vyos.config import Config
from vyos import ConfigError
from netifaces import interfaces
# Please be careful if you edit the template.
config_pppoe_tmpl = """
### Autogenerated by interfaces-pppoe.py ###
{% if description %}
# {{ description }}
{% endif %}
# Require peer to provide the local IP address if it is not
# specified explicitly in the config file.
noipdefault
# Don't show the password in logfiles:
hide-password
# Standard Link Control Protocol (LCP) parameters:
lcp-echo-interval 20
lcp-echo-failure 3
# RFC 2516, paragraph 7 mandates that the following options MUST NOT be
# requested and MUST be rejected if requested by the peer:
# Address-and-Control-Field-Compression (ACFC)
noaccomp
# Asynchronous-Control-Character-Map (ACCM)
default-asyncmap
# Override any connect script that may have been set in /etc/ppp/options.
connect /bin/true
# Don't try to authenticate the remote node
noauth
# Don't try to proxy ARP for the remote endpoint. User can set proxy
# arp entries up manually if they wish. More importantly, having
# the "proxyarp" parameter set disables the "defaultroute" option.
noproxyarp
plugin rp-pppoe.so
{{ link }}
persist
ifname {{ intf }}
ipparam {{ intf }}
debug
logfile /var/log/vyatta/ppp_{{ intf }}.log
{% if 'auto' in default_route -%}
defaultroute
{% elif 'force' in default_route -%}
defaultroute
replacedefaultroute
{% endif %}
mtu {{ mtu }}
mru {{ mtu }}
user "{{ user_id }}"
password "{{ password }}"
{% if 'auto' in name_server -%}
usepeerdns
{% endif %}
{% if ipv6_enable -%}
+ipv6
{% endif %}
"""
default_config_data = {
'access_concentrator': '',
'on_demand': False,
'default_route': 'auto',
'deleted': False,
'description': '',
'disable': False,
'intf': '',
'idle_timeout': '',
'ipv6_autoconf': False,
'ipv6_enable': False,
'link': '',
'local_address': '',
'mtu': '1492',
'name_server': 'auto',
'password': '',
'remote_address': '',
'service_name': '',
'user_id': ''
}
def subprocess_cmd(command):
p = Popen(command, stdout=PIPE, shell=True)
p.communicate()
def get_config():
pppoe = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
try:
pppoe['intf'] = os.environ['VYOS_TAGNODE_VALUE']
except KeyError as E:
print("Interface not specified")
# Check if interface has been removed
if not conf.exists('interfaces pppoe ' + pppoe['intf']):
pppoe['deleted'] = True
return pppoe
# set new configuration level
conf.set_level('interfaces pppoe ' + pppoe['intf'])
# Access concentrator name (only connect to this concentrator)
if conf.exists('access-concentrator'):
pppoe['access_concentrator'] = conf.return_values('access-concentrator')
# Access concentrator name (only connect to this concentrator)
if conf.exists('connect-on-demand'):
pppoe['on_demand'] = True
# Enable/Disable default route to peer when link comes up
if conf.exists('default-route'):
pppoe['default_route'] = conf.return_value('default-route')
# Retrieve interface description
if conf.exists('description'):
pppoe['description'] = conf.return_value('description')
# Disable this interface
if conf.exists('disable'):
pppoe['disable'] = True
# Delay before disconnecting idle session (in seconds)
if conf.exists('idle-timeout'):
pppoe['idle_timeout'] = conf.return_value('idle-timeout')
# Enable Stateless Address Autoconfiguration (SLAAC)
if conf.exists('ipv6 address autoconf'):
pppoe['ipv6_autoconf'] = True
# Activate IPv6 support on this connection
if conf.exists('ipv6 enable'):
pppoe['ipv6_enable'] = True
# IPv4 address of local end of the PPPoE link
if conf.exists('local-address'):
pppoe['local_address'] = conf.return_value('local-address')
# Physical Interface used for this PPPoE session
if conf.exists('link'):
pppoe['link'] = conf.return_value('link')
# Maximum Transmission Unit (MTU)
if conf.exists('mtu'):
pppoe['mtu'] = conf.return_value('mtu')
# IPv4 address of local end of the PPPoE link
if conf.exists('name-server'):
pppoe['name_server'] = conf.return_value('name-server')
# Password for authenticating local machine to PPPoE server
if conf.exists('password'):
pppoe['password'] = conf.return_value('password')
# IPv4 address of local end of the PPPoE link
if conf.exists('remote-address'):
pppoe['remote_address'] = conf.return_value('remote-address')
# Service name, only connect to access concentrators advertising this
if conf.exists('service-name'):
pppoe['service_name'] = conf.return_value('service-name')
# Authentication name supplied to PPPoE server
if conf.exists('user-id'):
pppoe['user_id'] = conf.return_value('user-id')
return pppoe
def verify(pppoe):
if pppoe['deleted']:
# bail out early
return None
if not pppoe['link']:
raise ConfigError('Physical link interface for PPPoE missing')
return None
def generate(pppoe):
config_file_pppoe = '/etc/ppp/peers/{}'.format(pppoe['intf'])
# Always hang-up PPPoE connection prior generating new configuration file
cmd = 'systemctl stop ppp@{}.service'.format(pppoe['intf'])
subprocess_cmd(cmd)
if pppoe['deleted']:
# Delete PPP configuration files
if os.path.exists(config_file_pppoe):
os.unlink(config_file_pppoe)
else:
# Create PPP configuration files
tmpl = Template(config_pppoe_tmpl)
config_text = tmpl.render(pppoe)
with open(config_file_pppoe, 'w') as f:
f.write(config_text)
return None
def apply(pppoe):
if not pppoe['disable']:
# Dial PPPoE connection
cmd = 'systemctl start ppp@{}.service'.format(pppoe['intf'])
subprocess_cmd(cmd)
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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