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#!/usr/bin/env python3
#
# Copyright (C) 2020 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/>.
#
# migrate disable-dhcp-nameservers (boolean) to name-servers-dhcp <interface>
# if disable-dhcp-nameservers is set, just remove it
# else retrieve all interface names that have configured dhcp(v6) address and
# add them to the new name-servers-dhcp node
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 = ['system']
if not config.exists(base):
# Nothing to do
exit(0)
if config.exists(base + ['disable-dhcp-nameservers']):
config.delete(base + ['disable-dhcp-nameservers'])
else:
dhcp_interfaces = []
# go through all interfaces searching for 'address dhcp(v6)?'
for sect in Interface.sections():
sect_base = ['interfaces', sect]
if not config.exists(sect_base):
continue
for intf in config.list_nodes(sect_base):
intf_base = sect_base + [intf]
# try without vlans
if config.exists(intf_base + ['address']):
for addr in config.return_values(intf_base + ['address']):
if addr in ['dhcp', 'dhcpv6']:
dhcp_interfaces.append(intf)
# try vif
if config.exists(intf_base + ['vif']):
for vif in config.list_nodes(intf_base + ['vif']):
vif_base = intf_base + ['vif', vif]
if config.exists(vif_base + ['address']):
for addr in config.return_values(vif_base + ['address']):
if addr in ['dhcp', 'dhcpv6']:
dhcp_interfaces.append(f'{intf}.{vif}')
# try vif-s
if config.exists(intf_base + ['vif-s']):
for vif_s in config.list_nodes(intf_base + ['vif-s']):
vif_s_base = intf_base + ['vif-s', vif_s]
if config.exists(vif_s_base + ['address']):
for addr in config.return_values(vif_s_base + ['address']):
if addr in ['dhcp', 'dhcpv6']:
dhcp_interfaces.append(f'{intf}.{vif_s}')
# try vif-c
if config.exists(intf_base + ['vif-c', vif_c]):
for vif_c in config.list_nodes(vif_s_base + ['vif-c', vif_c]):
vif_c_base = vif_s_base + ['vif-c', vif_c]
if config.exists(vif_c_base + ['address']):
for addr in config.return_values(vif_c_base + ['address']):
if addr in ['dhcp', 'dhcpv6']:
dhcp_interfaces.append(f'{intf}.{vif_s}.{vif_c}')
# set new config nodes
for intf in dhcp_interfaces:
config.set(base + ['name-servers-dhcp'], value=intf, replace=False)
# delete old node
config.delete(base + ['disable-dhcp-nameservers'])
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)
exit(0)

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