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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/>.
import os
import re
import sys
import vici
from json import loads
from vyos.util import cmd
from vyos.util import process_named_running
NHRP_CONFIG = "/run/opennhrp/opennhrp.conf"
def parse_type_ipsec(interface):
with open(NHRP_CONFIG, 'r') as f:
lines = f.readlines()
match = rf'^interface {interface} #(hub|spoke)(?:\s([\w-]+))?$'
for line in lines:
m = re.match(match, line)
if m:
return m[1], m[2]
return None, None
def add_peer_route(nbma_src: str, nbma_dst: str, mtu: str) -> None:
"""Add a route to a NBMA peer
Args:
nmba_src (str): a local IP address
nbma_dst (str): a remote IP address
mtu (str): a MTU for a route
"""
# Find routes to a peer
route_get_cmd = f'sudo ip -j route get {nbma_dst} from {nbma_src}'
try:
route_info_data = loads(cmd(route_get_cmd))
except Exception as err:
print(f'Unable to find a route to {nbma_dst}: {err}')
# Check if an output has an expected format
if not isinstance(route_info_data, list):
print(f'Garbage returned from the "{route_get_cmd}" command: \
{route_info_data}')
return
# Add static routes to a peer
for route_item in route_info_data:
route_dev = route_item.get('dev')
route_dst = route_item.get('dst')
route_gateway = route_item.get('gateway')
# Prepare a command to add a route
route_add_cmd = 'sudo ip route add'
if route_dst:
route_add_cmd = f'{route_add_cmd} {route_dst}'
if route_gateway:
route_add_cmd = f'{route_add_cmd} via {route_gateway}'
if route_dev:
route_add_cmd = f'{route_add_cmd} dev {route_dev}'
route_add_cmd = f'{route_add_cmd} proto 42 mtu {mtu}'
# Add a route
try:
cmd(route_add_cmd)
except Exception as err:
print(f'Unable to add a route using command "{route_add_cmd}": \
{err}')
def vici_initiate(conn, child_sa, src_addr, dest_addr):
try:
session = vici.Session()
logs = session.initiate({
'ike': conn,
'child': child_sa,
'timeout': '-1',
'my-host': src_addr,
'other-host': dest_addr
})
for log in logs:
message = log['msg'].decode('ascii')
print('INIT LOG:', message)
return True
except:
return None
def vici_terminate(conn, child_sa, src_addr, dest_addr):
try:
session = vici.Session()
logs = session.terminate({
'ike': conn,
'child': child_sa,
'timeout': '-1',
'my-host': src_addr,
'other-host': dest_addr
})
for log in logs:
message = log['msg'].decode('ascii')
print('TERM LOG:', message)
return True
except:
return None
def iface_up(interface):
cmd(f'sudo ip route flush proto 42 dev {interface}')
cmd(f'sudo ip neigh flush dev {interface}')
def peer_up(dmvpn_type, conn):
# src_addr = os.getenv('NHRP_SRCADDR')
src_nbma = os.getenv('NHRP_SRCNBMA')
# dest_addr = os.getenv('NHRP_DESTADDR')
dest_nbma = os.getenv('NHRP_DESTNBMA')
dest_mtu = os.getenv('NHRP_DESTMTU')
if dest_mtu:
add_peer_route(src_nbma, dest_nbma, dest_mtu)
if conn and dmvpn_type == 'spoke' and process_named_running('charon'):
vici_terminate(conn, 'dmvpn', src_nbma, dest_nbma)
vici_initiate(conn, 'dmvpn', src_nbma, dest_nbma)
def peer_down(dmvpn_type, conn):
src_nbma = os.getenv('NHRP_SRCNBMA')
dest_nbma = os.getenv('NHRP_DESTNBMA')
if conn and dmvpn_type == 'spoke' and process_named_running('charon'):
vici_terminate(conn, 'dmvpn', src_nbma, dest_nbma)
cmd(f'sudo ip route del {dest_nbma} src {src_nbma} proto 42')
def route_up(interface):
dest_addr = os.getenv('NHRP_DESTADDR')
dest_prefix = os.getenv('NHRP_DESTPREFIX')
next_hop = os.getenv('NHRP_NEXTHOP')
cmd(f'sudo ip route replace {dest_addr}/{dest_prefix} proto 42 \
via {next_hop} dev {interface}')
cmd('sudo ip route flush cache')
def route_down(interface):
dest_addr = os.getenv('NHRP_DESTADDR')
dest_prefix = os.getenv('NHRP_DESTPREFIX')
cmd(f'sudo ip route del {dest_addr}/{dest_prefix} proto 42')
cmd('sudo ip route flush cache')
if __name__ == '__main__':
action = sys.argv[1]
interface = os.getenv('NHRP_INTERFACE')
dmvpn_type, profile_name = parse_type_ipsec(interface)
dmvpn_conn = None
if profile_name:
dmvpn_conn = f'dmvpn-{profile_name}-{interface}'
if action == 'interface-up':
iface_up(interface)
elif action == 'peer-register':
pass
elif action == 'peer-up':
peer_up(dmvpn_type, dmvpn_conn)
elif action == 'peer-down':
peer_down(dmvpn_type, dmvpn_conn)
elif action == 'route-up':
route_up(interface)
elif action == 'route-down':
route_down(interface)
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