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interfaces-dummy.py
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interfaces-dummy.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 copy import deepcopy
from sys import exit
from netifaces import interfaces
from vyos.ifconfig import DummyIf
from vyos.configdict import list_diff
from vyos.config import Config
from vyos.validate import is_member
from vyos import ConfigError
default_config_data = {
'address': [],
'address_remove': [],
'deleted': False,
'description': '',
'disable': False,
'intf': '',
'is_bridge_member': False,
'vrf': ''
}
def get_config():
dummy = deepcopy(default_config_data)
conf = Config()
# determine tagNode instance
if 'VYOS_TAGNODE_VALUE' not in os.environ:
raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
dummy['intf'] = os.environ['VYOS_TAGNODE_VALUE']
# check if we are a member of any bridge
dummy['is_bridge_member'] = is_member(conf, dummy['intf'], 'bridge')
# 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')
# 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# address is no longer valid and needs to be removed from the interface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'] = list_diff(eff_addr, act_addr)
# retrieve VRF instance
if conf.exists('vrf'):
dummy['vrf'] = conf.return_value('vrf')
return dummy
def verify(dummy):
if dummy['deleted']:
if dummy['is_bridge_member']:
raise ConfigError((
f'Interface "{dummy["intf"]}" cannot be deleted as it is a '
f'member of bridge "{dummy["is_bridge_member"]}"!'))
return None
if dummy['vrf']:
if dummy['vrf'] not in interfaces():
raise ConfigError(f'VRF "{dummy["vrf"]}" does not exist')
if dummy['is_bridge_member']:
raise ConfigError((
f'Interface "{dummy["intf"]}" cannot be member of VRF '
f'"{dummy["vrf"]}" and bridge "{dummy["is_bridge_member"]}" '
f'at the same time!'))
if dummy['is_bridge_member'] and dummy['address']:
raise ConfigError((
f'Cannot assign address to interface "{dummy["intf"]}" '
f'as it is a member of bridge "{dummy["is_bridge_member"]}"!'))
return None
def generate(dummy):
return None
def apply(dummy):
d = DummyIf(dummy['intf'])
# Remove dummy interface
if dummy['deleted']:
d.remove()
else:
# update interface description used e.g. within SNMP
d.set_alias(dummy['description'])
# Configure interface address(es)
# - not longer required addresses get removed first
# - newly addresses will be added second
for addr in dummy['address_remove']:
d.del_addr(addr)
for addr in dummy['address']:
d.add_addr(addr)
# assign/remove VRF (ONLY when not a member of a bridge,
# otherwise 'nomaster' removes it from it)
if not dummy['is_bridge_member']:
d.set_vrf(dummy['vrf'])
# disable interface on demand
if dummy['disable']:
d.set_admin_state('down')
else:
d.set_admin_state('up')
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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