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show_dhcp.py
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show_dhcp.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 argparse
import tabulate
import vyos.config
from isc_dhcp_leases import Lease, IscDhcpLeases
lease_file = "/config/dhcpd.leases"
pool_key = "shared-networkname"
def in_pool(lease, pool):
if pool_key in lease.sets:
if lease.sets[pool_key] == pool:
return True
return False
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["hardware_address"] = lease.ethernet
data["hostname"] = lease.hostname
data["ip"] = lease.ip
try:
data["pool"] = lease.sets[pool_key]
except:
data["pool"] = ""
return data
def get_leases(leases, state=None, pool=None):
leases = IscDhcpLeases(lease_file).get()
if state is not None:
leases = list(filter(lambda x: x.binding_state == 'active', leases))
if pool is not None:
leases = list(filter(lambda x: in_pool(x, pool), leases))
return list(map(get_lease_data, leases))
def show_leases(leases):
headers = ["IP address", "Hardware address", "Lease expiration", "Pool", "Client Name"]
lease_list = []
for l in leases:
lease_list.append([l["ip"], l["hardware_address"], l["expires"], l["pool"], l["hostname"]])
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("-e", "--expired", action="store_true", help="Show expired leases")
parser.add_argument("-p", "--pool", type=str, action="store", help="Show lease for specific pool")
args = parser.parse_args()
if args.leases:
if args.expired:
if args.pool:
leases = get_leases(lease_file, state='free', pool=args.pool)
else:
leases = get_leases(lease_file, state='free')
else:
if args.pool:
leases = get_leases(lease_file, state='active', pool=args.pool)
else:
leases = get_leases(lease_file, state='active')
show_leases(leases)

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