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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 json
import argparse
import ipaddress
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)
def get_pool_size(config, pool):
size = 0
subnets = config.list_effective_nodes("service dhcp-server shared-network-name {0} subnet".format(pool))
for s in subnets:
ranges = config.list_effective_nodes("service dhcp-server shared-network-name {0} subnet {1} range".format(pool, s))
for r in ranges:
start = config.return_effective_value("service dhcp-server shared-network-name {0} subnet {1} range {2} start".format(pool, s, r))
stop = config.return_effective_value("service dhcp-server shared-network-name {0} subnet {1} range {2} stop".format(pool, s, r))
size += int(ipaddress.IPv4Address(stop)) - int(ipaddress.IPv4Address(start))
return size
def show_pool_stats(stats):
headers = ["Pool", "Size", "Leases", "Available", "Usage"]
output = tabulate.tabulate(stats, 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")
parser.add_argument("-j", "--json", action="store_true", default=False, help="Product JSON output")
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')
if args.json:
print(json.dumps(leases, indent=4))
else:
show_leases(leases)
elif args.statistics:
config = vyos.config.Config()
pools = []
# Get relevant pools
if args.pool:
pools = [args.pool]
else:
pools = config.list_effective_nodes("service dhcp-server shared-network-name")
# Get pool usage stats
stats = []
for p in pools:
size = get_pool_size(config, p)
leases = len(get_leases(lease_file, state='active', pool=args.pool))
if size != 0:
use_percentage = round(leases / size) * 100
else:
use_percentage = 0
if args.json:
pool_stats = {"pool": p, "size": size, "leases": leases,
"available": (size - leases), "percentage": use_percentage}
else:
# For tabulate
pool_stats = [p, size, leases, size - leases, "{0}%".format(use_percentage)]
stats.append(pool_stats)
# Print stats
if args.json:
print(json.dumps(stats, indent=4))
else:
show_pool_stats(stats)
else:
print("Use either --leases or --statistics option")

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