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
|
#!/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/>.
import os
from sys import exit
from vyos.config import Config
from vyos.util import call
from vyos.template import render
from vyos.template import render_to_string
from vyos import frr
from vyos import ConfigError, airbag
airbag.enable()
config_file = r'/tmp/bgp.frr'
def get_config():
conf = Config()
base = ['protocols', 'nbgp']
bgp = conf.get_config_dict(base, key_mangling=('-', '_'))
if not conf.exists(base):
bgp = {}
from pprint import pprint
pprint(bgp)
return bgp
def verify(bgp):
if not bgp:
return None
# Check if declared more than one ASN
for asn in bgp['nbgp'].items():
if len(bgp['nbgp']) > 1:
raise ConfigError('Only one bgp ASN process can be definded')
return None
def generate(bgp):
if not bgp:
bgp['new_frr_config'] = ''
return None
# render(config) not needed, its only for debug
render(config_file, 'frr/bgp.frr.tmpl', bgp)
bgp['new_frr_config'] = render_to_string('frr/bgp.frr.tmpl', bgp)
return None
def apply(bgp):
# Save original configration prior to starting any commit actions
bgp['original_config'] = frr.get_configuration(daemon='bgpd')
bgp['modified_config'] = frr.replace_section(bgp['original_config'], bgp['new_frr_config'], from_re='router bgp .*')
# Debugging
print('--------- DEBUGGING ----------')
print(f'Existing config:\n{bgp["original_config"]}\n\n')
print(f'Replacement config:\n{bgp["new_frr_config"]}\n\n')
print(f'Modified config:\n{bgp["modified_config"]}\n\n')
# Frr Mark configuration will test for syntax errors and exception out if any syntax errors are detected
frr.mark_configuration(bgp['modified_config'])
# Commit the resulting new configuration to frr, this will render an frr.CommitError() Exception on fail
frr.reload_configuration(bgp['modified_config'], daemon='bgpd')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
