#!/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) < 1): 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)