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#!/usr/bin/env python3
#
# Copyright (C) 2018-2019 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
import sys
import jinja2
from stat import S_IRUSR, S_IWUSR, S_IRGRP
from vyos.config import Config
from vyos import ConfigError
config_file = r'/etc/radvd.conf'
config_tmpl = """
### Autogenerated by service-router-advert.py ###
{% for i in interfaces -%}
interface {{ i.name }} {
IgnoreIfMissing on;
AdvDefaultPreference {{ i.default_preference }};
AdvManagedFlag {{ i.managed_flag }};
MaxRtrAdvInterval {{ i.interval_max }};
{% if i.interval_min %}
MinRtrAdvInterval {{ i.interval_min }};
{% endif %}
AdvReachableTime {{ i.reachable_time }};
AdvIntervalOpt {{ i.send_advert }};
AdvSendAdvert {{ i.send_advert }};
{% if i.default_lifetime %}
AdvDefaultLifetime {{ i.default_lifetime }};
{% endif %}
{% if i.link_mtu %}
AdvLinkMTU {{ i.link_mtu }};
{% endif %}
AdvOtherConfigFlag {{ i.other_config_flag }};
AdvRetransTimer {{ i.retrans_timer }};
AdvCurHopLimit {{ i.hop_limit }};
{% for p in i.prefixes %}
prefix {{ p.prefix }} {
AdvAutonomous {{ p.autonomous_flag }};
AdvValidLifetime {{ p.valid_lifetime }};
AdvOnLink {{ p.on_link }};
AdvPreferredLifetime {{ p.preferred_lifetime }};
};
{% endfor %}
{% if i.name_server %}
RDNSS {{ i.name_server | join(" ") }} {
};
{% endif %}
};
{% endfor -%}
"""
default_config_data = {
'interfaces': []
}
def get_config():
rtradv = default_config_data
conf = Config()
base_level = ['service', 'router-advert']
if not conf.exists(base_level):
return rtradv
for interface in conf.list_nodes(base_level + ['interface']):
intf = {
'name': interface,
'hop_limit' : '64',
'default_lifetime': '',
'default_preference': 'medium',
'dnssl': [],
'link_mtu': '',
'managed_flag': 'off',
'interval_max': '600',
'interval_min': '',
'name_server': [],
'other_config_flag': 'off',
'prefixes' : [],
'reachable_time': '0',
'retrans_timer': '0',
'send_advert': 'on'
}
# set config level first to reduce boilerplate code
conf.set_level(base_level + ['interface', interface])
if conf.exists(['hop-limit']):
intf['hop_limit'] = conf.return_value(['hop-limit'])
if conf.exists(['default-lifetim']):
intf['default_lifetime'] = conf.return_value(['default-lifetim'])
if conf.exists(['default-preference']):
intf['default_preference'] = conf.return_value(['default-preference'])
if conf.exists(['dnssl']):
intf['dnssl'] = conf.return_values(['dnssl'])
if conf.exists(['link-mtu']):
intf['link_mtu'] = conf.return_value(['link-mtu'])
if conf.exists(['managed-flag']):
intf['managed_flag'] = 'on'
if conf.exists(['interval', 'max']):
intf['interval_max'] = conf.return_value(['interval', 'max'])
if conf.exists(['interval', 'min']):
intf['interval_min'] = conf.return_value(['interval', 'min'])
if conf.exists(['name-server']):
intf['name_server'] = conf.return_values(['name-server'])
if conf.exists(['other-config-flag']):
intf['other_config_flag'] = 'on'
if conf.exists(['reachable-time']):
intf['reachable_time'] = conf.return_value(['reachable-time'])
if conf.exists(['retrans-timer']):
intf['retrans_timer'] = conf.return_value(['retrans-timer'])
if conf.exists(['no-send-advert']):
intf['send_advert'] = 'off'
for prefix in conf.list_nodes(['prefix']):
tmp = {
'prefix' : prefix,
'autonomous_flag' : 'on',
'on_link' : 'on',
'preferred_lifetime': '14400',
'valid_lifetime' : '2592000'
}
# set config level first to reduce boilerplate code
conf.set_level(base_level + ['interface', interface, 'prefix', prefix])
if conf.exists(['no-autonomous-flag']):
tmp['autonomous_flag'] = 'off'
if conf.exists(['no-on-link-flag']):
tmp['on_link'] = 'off'
if conf.exists(['preferred-lifetime']):
tmp['preferred_lifetime'] = conf.return_value(['preferred-lifetime'])
if conf.exists(['valid-lifetime']):
tmp['valid_lifetime'] = conf.return_value(['valid-lifetime'])
intf['prefixes'].append(tmp)
rtradv['interfaces'].append(intf)
return rtradv
def verify(rtradv):
return None
def generate(rtradv):
if not rtradv['interfaces']:
return None
tmpl = jinja2.Template(config_tmpl, trim_blocks=True)
config_text = tmpl.render(rtradv)
with open(config_file, 'w') as f:
f.write(config_text)
# adjust file permissions of new configuration file
if os.path.exists(config_file):
os.chmod(config_file, S_IRUSR | S_IWUSR | S_IRGRP)
return None
def apply(rtradv):
if not rtradv['interfaces']:
# bail out early - looks like removal from running config
os.system('sudo systemctl stop radvd.service')
if os.path.exists(config_file):
os.unlink(config_file)
return None
os.system('sudo systemctl restart radvd.service')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
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