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interface-loopback.py
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interface-loopback.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/>.
#
from os import environ
from sys import exit
from copy import deepcopy
from pyroute2 import IPDB
from vyos.config import Config
from vyos import ConfigError
default_config_data = {
'address': [],
'address_remove': [],
'deleted': False,
'description': '',
}
def diff(first, second):
second = set(second)
return [item for item in first if item not in second]
def get_config():
loopback = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
try:
loopback['intf'] = environ['VYOS_TAGNODE_VALUE']
except KeyError as E:
print("Interface not specified")
# Check if interface has been removed
if not conf.exists('interfaces loopback ' + loopback['intf']):
loopback['deleted'] = True
# set new configuration level
conf.set_level('interfaces loopback ' + loopback['intf'])
# retrieve configured interface addresses
if conf.exists('address'):
loopback['address'] = conf.return_values('address')
# retrieve interface description
if conf.exists('description'):
loopback['description'] = conf.return_value('description')
else:
loopback['description'] = loopback['intf']
# Determine interface addresses (currently effective) - to determine which
# address is no longer valid and needs to be removed from the interface
eff_addr = conf.return_effective_values('address')
act_addr = conf.return_values('address')
loopback['address_remove'] = diff(eff_addr, act_addr)
return loopback
def verify(loopback):
return None
def generate(loopback):
return None
def apply(loopback):
ipdb = IPDB(mode='explicit')
lo_if = loopback['intf']
# the loopback device always exists
lo = ipdb.interfaces[lo_if]
# begin() a transaction prior to make any change
lo.begin()
if not loopback['deleted']:
# update interface description used e.g. within SNMP
# update interface description used e.g. within SNMP
lo.ifalias = loopback['description']
# configure interface address(es)
for addr in loopback['address']:
lo.add_ip(addr)
# remove interface address(es)
for addr in loopback['address_remove']:
lo.del_ip(addr)
# commit changes on loopback interface
lo.commit()
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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