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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 copy import deepcopy
from sys import exit
from pyroute2 import IPDB
from vyos.config import Config
from vyos import ConfigError
default_config_data = {
'address': [],
'address_remove': [],
'deleted': False,
'description': '',
'disable': False,
'intf': ''
}
def diff(first, second):
second = set(second)
return [item for item in first if item not in second]
def get_config():
dummy = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
try:
dummy['intf'] = environ['VYOS_TAGNODE_VALUE']
except KeyError as E:
print("Interface not specified")
# Check if interface has been removed
if not conf.exists('interfaces dummy ' + dummy['intf']):
dummy['deleted'] = True
return dummy
# set new configuration level
conf.set_level('interfaces dummy ' + dummy['intf'])
# retrieve configured interface addresses
if conf.exists('address'):
dummy['address'] = conf.return_values('address')
# retrieve interface description
if conf.exists('description'):
dummy['description'] = conf.return_value('description')
else:
dummy['description'] = dummy['intf']
# Disable this interface
if conf.exists('disable'):
dummy['disable'] = True
# 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# address is no longer valid and needs to be removed from the interface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')
dummy['address_remove'] = diff(eff_addr, act_addr)
return dummy
def verify(dummy):
return None
def generate(dummy):
return None
def apply(dummy):
ipdb = IPDB(mode='explicit')
dummyif = dummy['intf']
# Remove dummy interface
if dummy['deleted']:
try:
# delete dummy interface
with ipdb.interface[ dummyif ] as du:
du.remove()
except:
pass
else:
try:
# create dummy interface if it's non existing
ipdb.create(kind='dummy', ifname=dummyif).commit()
except:
pass
# retrieve handle to dummy interface
du = ipdb.interfaces[dummyif]
# begin a transaction prior to make any change
du.begin()
# enable interface
du.up()
# update interface description used e.g. within SNMP
du.ifalias = dummy['description']
# Configure interface address(es)
for addr in dummy['address_remove']:
du.del_ip(addr)
for addr in dummy['address']:
du.add_ip(addr)
# disable interface on demand
if dummy['disable']:
du.down()
# commit changes on bridge interface
du.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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