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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/>.
from pprint import pprint
import os
import re
import sys
import vici
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 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:
args = cmd(f'sudo ip route get {dest_nbma} from {src_nbma}')
cmd(f'sudo ip route add {args} proto 42 mtu {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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