1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
#!/usr/bin/env python3
#
# Copyright (C) 2018-2022 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/>.
import os
from sys import exit
from vyos.base import Warning
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.template import render
from vyos.util import call
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/run/radvd/radvd.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'router-advert']
rtradv = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_interface_values = defaults(base + ['interface'])
# we deal with prefix, route defaults later on
if 'prefix' in default_interface_values:
del default_interface_values['prefix']
if 'route' in default_interface_values:
del default_interface_values['route']
default_prefix_values = defaults(base + ['interface', 'prefix'])
default_route_values = defaults(base + ['interface', 'route'])
if 'interface' in rtradv:
for interface in rtradv['interface']:
rtradv['interface'][interface] = dict_merge(
default_interface_values, rtradv['interface'][interface])
if 'prefix' in rtradv['interface'][interface]:
for prefix in rtradv['interface'][interface]['prefix']:
rtradv['interface'][interface]['prefix'][prefix] = dict_merge(
default_prefix_values, rtradv['interface'][interface]['prefix'][prefix])
if 'route' in rtradv['interface'][interface]:
for route in rtradv['interface'][interface]['route']:
rtradv['interface'][interface]['route'][route] = dict_merge(
default_route_values, rtradv['interface'][interface]['route'][route])
if 'name_server' in rtradv['interface'][interface]:
# always use a list when dealing with nameservers - eases the template generation
if isinstance(rtradv['interface'][interface]['name_server'], str):
rtradv['interface'][interface]['name_server'] = [
rtradv['interface'][interface]['name_server']]
return rtradv
def verify(rtradv):
if not rtradv:
return None
if 'interface' not in rtradv:
return None
for interface, interface_config in rtradv['interface'].items():
if 'prefix' in interface:
for prefix, prefix_config in interface_config['prefix'].items():
valid_lifetime = prefix_config['valid_lifetime']
if valid_lifetime == 'infinity':
valid_lifetime = 4294967295
preferred_lifetime = prefix_config['preferred_lifetime']
if preferred_lifetime == 'infinity':
preferred_lifetime = 4294967295
if not (int(valid_lifetime) >= int(preferred_lifetime)):
raise ConfigError('Prefix valid-lifetime must be greater then or equal to preferred-lifetime')
if 'name_server_lifetime' in interface_config:
# man page states:
# The maximum duration how long the RDNSS entries are used for name
# resolution. A value of 0 means the nameserver must no longer be
# used. The value, if not 0, must be at least MaxRtrAdvInterval. To
# ensure stale RDNSS info gets removed in a timely fashion, this
# should not be greater than 2*MaxRtrAdvInterval.
lifetime = int(interface_config['name_server_lifetime'])
interval_max = int(interface_config['interval']['max'])
if lifetime > 0:
if lifetime < int(interval_max):
raise ConfigError(f'RDNSS lifetime must be at least "{interval_max}" seconds!')
if lifetime > 2* interval_max:
Warning(f'RDNSS lifetime should not exceed "{2 * interval_max}" which is two times "interval max"!')
return None
def generate(rtradv):
if not rtradv:
return None
render(config_file, 'router-advert/radvd.conf.j2', rtradv, permission=0o644)
return None
def apply(rtradv):
systemd_service = 'radvd.service'
if not rtradv:
# bail out early - looks like removal from running config
call(f'systemctl stop {systemd_service}')
if os.path.exists(config_file):
os.unlink(config_file)
return None
call(f'systemctl reload-or-restart {systemd_service}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
