/
dhcpd.py
90 lines (76 loc) · 2.75 KB
/
dhcpd.py
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import time
from cross_platform import files
class Leases(object):
def __init__(self, file_name):
self.leases = []
current_lease = None
for line in files.yield_lines(file_name):
line = line.strip()
if line.startswith('#') or line == '':
continue
elif line.startswith('lease ') and current_lease == None:
current_lease = Lease(line)
elif line.startswith('}') and current_lease != None:
self.leases.append(current_lease)
current_lease = None
elif current_lease != None:
current_lease.add_line(line)
else:
continue
self.leases.sort()
self.leases.reverse()
def has_key(self, mac):
match = False
for lease in self.leases:
if lease.mac == mac:
match = True
break
return match
def __getitem__(self, mac):
for lease in self.leases:
if lease.mac == mac:
return lease
raise KeyError('MAC %s not found in leases.' % mac)
def __iter__(self):
return iter(self.leases)
def yield_unique(self):
reported = []
for lease in self.leases:
if (lease.host_name, lease.ip) in reported:
continue
else:
reported.append((lease.host_name, lease.ip))
yield lease
class Lease(object):
def __init__(self, line):
self.ip = line.split()[1]
self.mac = None
self.expiration = None
self.host_name = None
def __cmp__(self, other):
"""The lease that compares highest is the one with that expires last.
"""
if other == None:
return 1
return cmp(self.expiration, other.expiration)
def add_line(self, line):
fields = line[:-1].split() #Get rid of trailing semicolon before split.
if fields[0] == 'ends':
timestamp = '%s %s' % (fields[2], fields[3])
self.expiration = time.mktime(
time.strptime(timestamp, '%Y/%m/%d %H:%M:%S')
)
elif fields[0:2] == ['hardware', 'ethernet']:
self.mac = fields[2]
elif fields[0] == 'client-hostname':
self.set_host_name(fields[1])
def set_host_name(self, host_name):
for character in ('"', "'"):
host_name = host_name.replace(character, '')
for character in ('/', '\\', '_', ' '):
host_name = host_name.replace(character, '-')
while host_name.startswith('-'):
host_name = host_name[1:]
if host_name == '':
return
self.host_name = host_name.lower()