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#!/usr/bin/env python3
#
# Copyright (C) 2021 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/>.
from netifaces import interfaces
from sys import exit
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.ifconfig import VTIIf
from vyos.util import dict_search
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'vti']
vti = get_interface_dict(conf, base)
# VTI is more then an interface - we retrieve the "real" configuration from
# the IPsec peer configuration which binds this VTI
conf.set_level([])
vti['ipsec'] = conf.get_config_dict(['vpn', 'ipsec', 'site-to-site', 'peer'],
key_mangling=('-', '_'), get_first_key=True,
no_tag_node_value_mangle=True)
for peer, peer_config in vti['ipsec'].items():
if dict_search('vti.bind', peer_config) == vti['ifname']:
vti['remote'] = peer
if 'local_address' in peer_config:
vti['source_address'] = peer_config['local_address']
# we also need to "calculate" a per vti individual key
base = 0x900000
vti['key'] = base + int(vti['ifname'].lstrip('vti'))
return vti
def verify(vti):
if 'deleted' in vti:
return None
ifname = vti['ifname']
found = False
for peer, peer_config in vti['ipsec'].items():
if dict_search('vti.bind', peer_config) == ifname:
found = True
# we can now stop processing the for loop
break
if not found:
tmp = vti['ifname']
raise ConfigError(f'Interface "{ifname}" not referenced in any VPN configuration!')
return None
def generate(vti):
return None
def apply(vti):
if vti['ifname'] in interfaces():
# Always delete the VTI interface in advance
VTIIf(**vti).remove()
if 'deleted' not in vti:
tmp = VTIIf(**vti)
tmp.update(vti)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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