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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/>.
#
# This migration script will remove the deprecated 'listen-on' statement
# from the dns forwarding service and will add the corresponding
# listen-address nodes instead. This is required as PowerDNS can only listen
# on interface addresses and not on interface names.
from ipaddress import ip_interface
from sys import argv, exit
from vyos.ifconfig import Interface
from vyos.configtree import ConfigTree
if len(argv) < 2:
print("Must specify file name!")
exit(1)
file_name = argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
config = ConfigTree(config_file)
base = ['service', 'dns', 'forwarding']
if not config.exists(base + ['listen-on']):
# Nothing to do
exit(0)
listen_intf = config.return_values(base + ['listen-on'])
# Delete node with abandoned command
config.delete(base + ['listen-on'])
# retrieve interface addresses for every configured listen-on interface
listen_addr = []
for intf in listen_intf:
# we need to evaluate the interface section before manipulating the 'intf' variable
section = Interface.section(intf)
if not section:
raise ValueError(f'Invalid interface name {intf}')
# we need to treat vif and vif-s interfaces differently,
# both "real interfaces" use dots for vlan identifiers - those
# need to be exchanged with vif and vif-s identifiers
if intf.count('.') == 1:
# this is a regular VLAN interface
intf = intf.split('.')[0] + ' vif ' + intf.split('.')[1]
elif intf.count('.') == 2:
# this is a QinQ VLAN interface
intf = intf.split('.')[0] + ' vif-s ' + intf.split('.')[1] + ' vif-c ' + intf.split('.')[2]
# retrieve corresponding interface addresses in CIDR format
# those need to be converted in pure IP addresses without network information
path = ['interfaces', section, intf, 'address']
try:
for addr in config.return_values(path):
listen_addr.append( ip_interface(addr).ip )
except:
# Some interface types do not use "address" option (e.g. OpenVPN)
# and may not even have a fixed address
print("Could not retrieve the address of the interface {} from the config".format(intf))
print("You will need to update your DNS forwarding configuration manually")
for addr in listen_addr:
config.set(base + ['listen-address'], value=addr, replace=False)
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print(f'Failed to save the modified config: {e}')
exit(1)
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