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bgp.py
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#!/usr/bin/env python3
#
# Copyright (C) 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/>.
#
# Purpose:
# Displays bgp neighbors information.
# Used by the "show bgp (vrf <tag>) ipv4|ipv6 neighbors" commands.
import re
import sys
import typing
import jmespath
from jinja2 import Template
from humps import decamelize
from vyos.configquery import ConfigTreeQuery
import vyos.opmode
frr_command_template = Template("""
{% if family %}
show bgp
{{ 'vrf ' ~ vrf if vrf else '' }}
{{ 'ipv6' if family == 'inet6' else 'ipv4'}}
{{ 'neighbor ' ~ peer if peer else 'summary' }}
{% endif %}
{% if raw %}
json
{% endif %}
""")
def _verify(func):
"""Decorator checks if BGP config exists
BGP configuration can be present under vrf <tag>
If we do npt get arg 'peer' then it can be 'bgp summary'
"""
from functools import wraps
@wraps(func)
def _wrapper(*args, **kwargs):
config = ConfigTreeQuery()
afi = 'ipv6' if kwargs.get('family') == 'inet6' else 'ipv4'
global_vrfs = ['all', 'default']
peer = kwargs.get('peer')
vrf = kwargs.get('vrf')
unconf_message = f'BGP or neighbor is not configured'
# Add option to check the specific neighbor if we have arg 'peer'
peer_opt = f'neighbor {peer} address-family {afi}-unicast' if peer else ''
vrf_opt = ''
if vrf and vrf not in global_vrfs:
vrf_opt = f'vrf name {vrf}'
# Check if config does not exist
if not config.exists(f'{vrf_opt} protocols bgp {peer_opt}'):
raise vyos.opmode.UnconfiguredSubsystem(unconf_message)
return func(*args, **kwargs)
return _wrapper
@_verify
def show_neighbors(raw: bool,
family: str,
peer: typing.Optional[str],
vrf: typing.Optional[str]):
kwargs = dict(locals())
frr_command = frr_command_template.render(kwargs)
frr_command = re.sub(r'\s+', ' ', frr_command)
from vyos.util import cmd
output = cmd(f"vtysh -c '{frr_command}'")
if raw:
from json import loads
data = loads(output)
# Get list of the peers
peers = jmespath.search('*.peers | [0]', data)
if peers:
# Create new dict, delete old key 'peers'
# add key 'peers' neighbors to the list
list_peers = []
new_dict = jmespath.search('* | [0]', data)
if 'peers' in new_dict:
new_dict.pop('peers')
for neighbor, neighbor_options in peers.items():
neighbor_options['neighbor'] = neighbor
list_peers.append(neighbor_options)
new_dict['peers'] = list_peers
return decamelize(new_dict)
data = jmespath.search('* | [0]', data)
return decamelize(data)
else:
return output
if __name__ == '__main__':
try:
res = vyos.opmode.run(sys.modules[__name__])
if res:
print(res)
except (ValueError, vyos.opmode.Error) as e:
print(e)
sys.exit(1)

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bgp.py (3 KB)

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