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show_dhcpv6.py
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show_dhcpv6.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 json
import argparse
import ipaddress
import tabulate
import sys
from vyos.config import Config
from isc_dhcp_leases import Lease, IscDhcpLeases
lease_file = "/config/dhcpdv6.leases"
def get_lease_data(lease):
data = {}
# End time may not be present in backup leases
try:
data["expires"] = lease.end.strftime("%Y/%m/%d %H:%M:%S")
except:
data["expires"] = ""
data["duid"] = lease.host_identifier_string
data["ip"] = lease.ip
return data
def get_leases(leases, state=None):
leases = IscDhcpLeases(lease_file).get()
if state is not None:
leases = list(filter(lambda x: x.binding_state == 'active', leases))
return list(map(get_lease_data, leases))
def show_leases(leases):
headers = ["IPv6 address", "Lease expiration", "DUID"]
lease_list = []
for l in leases:
lease_list.append([l["ip"], l["expires"], l["duid"]])
output = tabulate.tabulate(lease_list, headers)
print(output)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument("-l", "--leases", action="store_true", help="Show DHCP leases")
group.add_argument("-s", "--statistics", action="store_true", help="Show DHCP statistics")
parser.add_argument("-p", "--pool", type=str, action="store", help="Show lease for specific pool")
parser.add_argument("-j", "--json", action="store_true", default=False, help="Product JSON output")
args = parser.parse_args()
# Do nothing if service is not configured
c = Config()
if not c.exists_effective('service dhcpv6-server'):
print("DHCPv6 service is not configured")
sys.exit(0)
if args.leases:
leases = get_leases(lease_file, state='active')
show_leases(leases)
elif args.statistics:
print("DHCPv6 statistics option is not available")
else:
print("Invalid option")

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