140 lines
4.2 KiB
Python
Executable File
140 lines
4.2 KiB
Python
Executable File
#!/usr/bin/python3
|
|
|
|
import argparse
|
|
import configparser
|
|
import os, sys
|
|
import kazoo.client
|
|
import re
|
|
|
|
#
|
|
# Variables
|
|
#
|
|
#
|
|
# General Functions
|
|
#
|
|
def get_zookeeper_key():
|
|
# Get the interface from environment (passed by dnsmasq)
|
|
try:
|
|
interface = os.environ['DNSMASQ_INTERFACE']
|
|
except:
|
|
exit(1)
|
|
# Get the ID of the interface (the digits)
|
|
network_vni = re.findall('\d+', interface)[0]
|
|
# Create the key
|
|
zookeeper_key = '/networks/{}/dhcp_leases'.format(network_vni)
|
|
return zookeeper_key
|
|
|
|
def get_lease_expiry():
|
|
try:
|
|
expiry = os.environ['DNSMASQ_LEASE_EXPIRES']
|
|
except:
|
|
expiry = '0'
|
|
return expiry
|
|
|
|
def get_client_id():
|
|
try:
|
|
client_id = os.environ['DNSMASQ_CLIENT_ID']
|
|
except:
|
|
client_id = '*'
|
|
return client_id
|
|
|
|
def connect_zookeeper():
|
|
# We expect the environ to contain the config file
|
|
try:
|
|
pvcrd_config_file = os.environ['PVCRD_CONFIG_FILE']
|
|
except:
|
|
# Default place
|
|
pvcrd_config_file = '/etc/pvc/pvcrd.conf'
|
|
|
|
o_config = configparser.ConfigParser()
|
|
o_config.read(pvcrd_config_file)
|
|
|
|
try:
|
|
zk_host = o_config['default']['zookeeper']
|
|
except:
|
|
try:
|
|
zk_host = o_config[socket.gethostname()]['zookeeper']
|
|
except:
|
|
exit(1)
|
|
|
|
zk_conn = kazoo.client.KazooClient(hosts=zk_host)
|
|
try:
|
|
zk_conn.start()
|
|
except:
|
|
exit(1)
|
|
|
|
return zk_conn
|
|
|
|
def read_data(zk_conn, key):
|
|
return zk_conn.get(key)[0].decode('ascii')
|
|
|
|
def get_lease(zk_conn, zk_leases_key, macaddr):
|
|
expiry = read_data(zk_conn, '{}/{}/expiry'.format(zk_leases_key, macaddr))
|
|
ipaddr = read_data(zk_conn, '{}/{}/ipaddr'.format(zk_leases_key, macaddr))
|
|
hostname = read_data(zk_conn, '{}/{}/hostname'.format(zk_leases_key, macaddr))
|
|
clientid = read_data(zk_conn, '{}/{}/clientid'.format(zk_leases_key, macaddr))
|
|
return expiry, ipaddr, hostname, clientid
|
|
|
|
#
|
|
# Command Functions
|
|
#
|
|
def read_lease_database(zk_conn, zk_leases_key):
|
|
leases_list = zk_conn.get_children(zk_leases_key)
|
|
output_list = []
|
|
for macaddr in leases_list:
|
|
expiry, ipaddr, hostname, clientid = get_lease(zk_conn, zk_leases_key, macaddr)
|
|
data_string = '{} {} {} {} {}'.format(expiry, macaddr, ipaddr, hostname, clientid)
|
|
print('Reading lease from Zookeeper: {}'.format(data_string), file=sys.stderr)
|
|
output_list.append('{}'.format(data_string))
|
|
|
|
# Output list
|
|
print('\n'.join(output_list))
|
|
|
|
def add_lease(zk_conn, zk_leases_key, expiry, macaddr, ipaddr, hostname, clientid):
|
|
transaction = zk_conn.transaction()
|
|
transaction.create('{}/{}'.format(zk_leases_key, macaddr), ''.encode('ascii'))
|
|
transaction.create('{}/{}/expiry'.format(zk_leases_key, macaddr), expiry.encode('ascii'))
|
|
transaction.create('{}/{}/ipaddr'.format(zk_leases_key, macaddr), ipaddr.encode('ascii'))
|
|
transaction.create('{}/{}/hostname'.format(zk_leases_key, macaddr), hostname.encode('ascii'))
|
|
transaction.create('{}/{}/clientid'.format(zk_leases_key, macaddr), clientid.encode('ascii'))
|
|
transaction.commit()
|
|
|
|
def del_lease(zk_conn, zk_leases_key, macaddr, expiry):
|
|
zk_conn.delete('{}/{}'.format(zk_leases_key, macaddr), recursive=True)
|
|
|
|
#
|
|
# Instantiate the parser
|
|
#
|
|
parser = argparse.ArgumentParser(description='Store or retrieve dnsmasq leases in Zookeeper')
|
|
parser.add_argument('action', type=str, help='Action')
|
|
parser.add_argument('macaddr', type=str, help='MAC Address', nargs='?', default=None)
|
|
parser.add_argument('ipaddr', type=str, help='IP Address', nargs='?', default=None)
|
|
parser.add_argument('hostname', type=str, help='Hostname', nargs='?', default=None)
|
|
args = parser.parse_args()
|
|
|
|
action = args.action
|
|
macaddr = args.macaddr
|
|
ipaddr = args.ipaddr
|
|
hostname = args.hostname
|
|
|
|
zk_conn = connect_zookeeper()
|
|
zk_leases_key = get_zookeeper_key()
|
|
|
|
if action == 'init':
|
|
read_lease_database(zk_conn, zk_leases_key)
|
|
exit(0)
|
|
|
|
expiry = get_lease_expiry()
|
|
clientid = get_client_id()
|
|
|
|
#
|
|
# Choose action
|
|
#
|
|
print('Lease action - {} {} {} {}'.format(action, macaddr, ipaddr, hostname), file=sys.stderr)
|
|
if action == 'add':
|
|
add_lease(zk_conn, zk_leases_key, expiry, macaddr, ipaddr, hostname, clientid)
|
|
elif action == 'del':
|
|
del_lease(zk_conn, zk_leases_key, macaddr, expiry)
|
|
elif action == 'old':
|
|
pass
|