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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/>.
# - T3037, BGP address-family ipv6-unicast capability dynamic does not exist in
# FRR, there is only a base, per neighbor dynamic capability, migrate config
import sys
from vyos.configtree import ConfigTree
if (len(sys.argv) < 2):
print("Must specify file name!")
sys.exit(1)
file_name = sys.argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
base = ['protocols', 'bgp']
config = ConfigTree(config_file)
if not config.exists(base):
# Nothing to do
sys.exit(0)
# Check if BGP is actually configured and obtain the ASN
asn_list = config.list_nodes(base)
if asn_list:
# There's always just one BGP node, if any
bgp_base = base + [asn_list[0]]
for neighbor_type in ['neighbor', 'peer-group']:
if not config.exists(bgp_base + [neighbor_type]):
continue
for neighbor in config.list_nodes(bgp_base + [neighbor_type]):
cap_dynamic = False
for afi in ['ipv4-unicast', 'ipv6-unicast']:
afi_path = bgp_base + [neighbor_type, neighbor, 'address-family', afi, 'capability', 'dynamic']
if config.exists(afi_path):
cap_dynamic = True
config.delete(afi_path)
# We have now successfully migrated the address-family specific
# dynamic capability to the neighbor/peer-group level. If this
# has been the only option under the address-family nodes, we
# can clean them up by checking if no other nodes are left under
# that tree and if so, delete the parent.
#
# We walk from the most inner node to the most outer one.
cleanup = -1
while len(config.list_nodes(afi_path[:cleanup])) == 0:
config.delete(afi_path[:cleanup])
cleanup -= 1
if cap_dynamic:
config.set(bgp_base + [neighbor_type, neighbor, 'capability', 'dynamic'])
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))
sys.exit(1)
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