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# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. 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 vyos.ifconfig import Interface
from vyos.configtree import ConfigTree
base = ['service', 'dns', 'forwarding']
def migrate(config: ConfigTree) -> None:
if not config.exists(base + ['listen-on']):
# Nothing to do
return
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)
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