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#!/usr/bin/env python3
#
# Copyright (C) 2024 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/>.
# T5993: Check if subnet is locally accessible and assign interface to subnet
import sys
from ipaddress import ip_network
from vyos.configtree import ConfigTree
if (len(sys.argv) < 1):
print("Must specify file name!")
sys.exit(1)
file_name = sys.argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
base = ['service', 'dhcpv6-server', 'shared-network-name']
config = ConfigTree(config_file)
if not config.exists(base):
# Nothing to do
exit(0)
def find_subnet_interface(subnet):
subnet_net = ip_network(subnet)
def check_addr(if_path):
if config.exists(if_path + ['address']):
for addr in config.return_values(if_path + ['address']):
try:
if ip_network(addr, strict=False) == subnet_net:
return True
except:
pass # interface address was probably "dhcp" or other magic string
return None
for iftype in config.list_nodes(['interfaces']):
for ifname in config.list_nodes(['interfaces', iftype]):
if_base = ['interfaces', iftype, ifname]
if check_addr(if_base):
return ifname
if config.exists(if_base + ['vif']):
for vif in config.list_nodes(if_base + ['vif']):
if check_addr(if_base + ['vif', vif]):
return f'{ifname}.{vif}'
if config.exists(if_base + ['vif-s']):
for vifs in config.list_nodes(if_base + ['vif-s']):
if check_addr(if_base + ['vif-s', vifs]):
return f'{ifname}.{vifs}'
if config.exists(if_base + ['vif-s', vifs, 'vif-c']):
for vifc in config.list_nodes(if_base + ['vif-s', vifs, 'vif-c']):
if check_addr(if_base + ['vif-s', vifs, 'vif-c', vifc]):
return f'{ifname}.{vifs}.{vifc}'
return False
for network in config.list_nodes(base):
if not config.exists(base + [network, 'subnet']):
continue
for subnet in config.list_nodes(base + [network, 'subnet']):
subnet_interface = find_subnet_interface(subnet)
if subnet_interface:
config.set(base + [network, 'subnet', subnet, 'interface'], value=subnet_interface)
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print("Failed to save the modified config: {}".format(e))
exit(1)
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