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arp.py
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arp.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018 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 sys
import os
import re
import syslog as sl
import subprocess
from vyos.config import Config
from vyos import ConfigError
arp_cmd = '/usr/sbin/arp'
def get_config():
c = Config()
if not c.exists('protocols static arp'):
return None
c.set_level('protocols static')
config_data = {}
for ip_addr in c.list_nodes('arp'):
config_data.update(
{
ip_addr : c.return_value('arp ' + ip_addr + ' hwaddr')
}
)
return config_data
def generate(c):
c_eff = Config()
c_eff.set_level('protocols static')
c_eff_cnf = {}
for ip_addr in c_eff.list_effective_nodes('arp'):
c_eff_cnf.update(
{
ip_addr : c_eff.return_effective_value('arp ' + ip_addr + ' hwaddr')
}
)
config_data = {
'remove' : [],
'update' : {}
}
### removal
if c == None:
for ip_addr in c_eff_cnf:
config_data['remove'].append(ip_addr)
else:
for ip_addr in c_eff_cnf:
if not ip_addr in c or c[ip_addr] == None:
config_data['remove'].append(ip_addr)
### add/update
if c != None:
for ip_addr in c:
if not ip_addr in c_eff_cnf:
config_data['update'][ip_addr] = c[ip_addr]
if ip_addr in c_eff_cnf:
if c[ip_addr] != c_eff_cnf[ip_addr] and c[ip_addr] != None:
config_data['update'][ip_addr] = c[ip_addr]
return config_data
def apply(c):
for ip_addr in c['remove']:
sl.syslog(sl.LOG_NOTICE, "arp -d " + ip_addr)
subprocess.call([arp_cmd + ' -d ' + ip_addr + ' >/dev/null 2>&1'], shell=True)
for ip_addr in c['update']:
sl.syslog(sl.LOG_NOTICE, "arp -s " + ip_addr + " " + c['update'][ip_addr])
subprocess.call([arp_cmd + ' -s ' + ip_addr + ' ' + c['update'][ip_addr] ], shell=True)
if __name__ == '__main__':
try:
c = get_config()
## syntax verification is done via cli
config = generate(c)
apply(config)
except ConfigError as e:
print(e)
sys.exit(1)

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