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@@ -0,0 +1,203 @@
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+#!/usr/bin/python
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+import datetime, bisect
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+
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+def parse_timestamp(raw_str):
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+ tokens = raw_str.split()
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+ if len(tokens) == 1:
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+ if tokens[0].lower() == 'never':
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+ return 'never';
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+ else:
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+ raise Exception('Parse error in timestamp')
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+ elif len(tokens) == 3:
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+ return datetime.datetime.strptime(' '.join(tokens[1:]),
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+ '%Y/%m/%d %H:%M:%S')
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+ else:
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+ raise Exception('Parse error in timestamp')
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+
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+def timestamp_is_ge(t1, t2):
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+ if t1 == 'never':
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+ return True
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+ elif t2 == 'never':
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+ return False
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+ else:
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+ return t1 >= t2
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+
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+def timestamp_is_lt(t1, t2):
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+ if t1 == 'never':
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+ return False
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+ elif t2 == 'never':
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+ return t1 != 'never'
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+ else:
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+ return t1 < t2
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+
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+def timestamp_is_between(t, tstart, tend):
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+ return timestamp_is_ge(t, tstart) and timestamp_is_lt(t, tend)
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+
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+def parse_hardware(raw_str):
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+ tokens = raw_str.split()
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+ if len(tokens) == 2:
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+ return tokens[1]
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+ else:
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+ raise Exception('Parse error in hardware')
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+
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+def strip_endquotes(raw_str):
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+ return raw_str.strip('"')
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+
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+def identity(raw_str):
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+ return raw_str
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+
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+def parse_binding_state(raw_str):
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+ tokens = raw_str.split()
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+ if len(tokens) == 2:
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+ return tokens[1]
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+ else:
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+ raise Exception('Parse error in binding state')
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+
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+def parse_next_binding_state(raw_str):
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+ tokens = raw_str.split()
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+ if len(tokens) == 3:
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+ return tokens[2]
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+ else:
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+ raise Exception('Parse error in next binding state')
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+
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+def parse_rewind_binding_state(raw_str):
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+ tokens = raw_str.split()
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+ if len(tokens) == 3:
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+ return tokens[2]
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+ else:
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+ raise Exception('Parse error in next binding state')
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+
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+def parse_leases_file(leases_file):
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+ valid_keys = {
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+ 'starts': parse_timestamp,
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+ 'ends': parse_timestamp,
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+ 'tstp': parse_timestamp,
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+ 'tsfp': parse_timestamp,
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+ 'atsfp': parse_timestamp,
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+ 'cltt': parse_timestamp,
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+ 'hardware': parse_hardware,
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+ 'binding': parse_binding_state,
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+ 'next': parse_next_binding_state,
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+ 'rewind': parse_rewind_binding_state,
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+ 'uid': strip_endquotes,
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+ 'client-hostname': strip_endquotes,
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+ 'option': identity,
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+ 'set': identity,
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+ 'on': identity,
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+ 'abandoned': None,
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+ 'bootp': None,
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+ 'reserved': None,
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+ }
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+ leases_db = {}
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+ lease_rec = {}
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+ in_lease = False
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+ in_failover = False
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+ for line in leases_file:
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+ if line.lstrip().startswith('#'):
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+ continue
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+ tokens = line.split()
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+ if len(tokens) == 0:
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+ continue
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+ key = tokens[0].lower()
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+ if key == 'lease':
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+ if not in_lease:
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+ ip_address = tokens[1]
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+ lease_rec = {'ip_address' : ip_address}
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+ in_lease = True
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+ else:
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+ raise Exception('Parse error in leases file')
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+ elif key == 'failover':
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+ in_failover = True
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+ elif key == '}':
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+ if in_lease:
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+ for k in valid_keys:
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+ if callable(valid_keys[k]):
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+ lease_rec[k] = lease_rec.get(k, '')
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+ else:
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+ lease_rec[k] = False
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+ ip_address = lease_rec['ip_address']
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+ if ip_address in leases_db:
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+ leases_db[ip_address].insert(0, lease_rec)
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+ else:
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+ leases_db[ip_address] = [lease_rec]
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+ lease_rec = {}
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+ in_lease = False
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+ elif in_failover:
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+ in_failover = False
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+ continue
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+ else:
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+ raise Exception('Parse error in leases file')
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+ elif key in valid_keys:
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+ if in_lease:
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+ value = line[(line.index(key) + len(key)):]
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+ value = value.strip().rstrip(';').rstrip()
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+ if callable(valid_keys[key]):
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+ lease_rec[key] = valid_keys[key](value)
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+ else:
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+ lease_rec[key] = True
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+ else:
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+ raise Exception('Parse error in leases file')
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+ else:
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+ if in_lease:
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+ raise Exception('Parse error in leases file')
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+ if in_lease:
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+ raise Exception('Parse error in leases file')
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+ return leases_db
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+
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+def round_timedelta(tdelta):
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+ return datetime.timedelta(tdelta.days,
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+ tdelta.seconds + (0 if tdelta.microseconds < 500000 else 1))
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+
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+def timestamp_now():
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+ n = datetime.datetime.utcnow()
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+ return datetime.datetime(n.year, n.month, n.day, n.hour, n.minute,
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+ n.second + (0 if n.microsecond < 500000 else 1))
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+
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+def lease_is_active(lease_rec, as_of_ts):
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+ return timestamp_is_between(as_of_ts, lease_rec['starts'],
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+ lease_rec['ends'])
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+
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+def ipv4_to_int(ipv4_addr):
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+ parts = ipv4_addr.split('.')
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+ return (int(parts[0]) << 24) + (int(parts[1]) << 16) + \
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+ (int(parts[2]) << 8) + int(parts[3])
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+
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+def select_active_leases(leases_db, as_of_ts):
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+ retarray = []
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+ sortedarray = []
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+ for ip_address in leases_db:
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+ lease_rec = leases_db[ip_address][0]
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+ if lease_is_active(lease_rec, as_of_ts):
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+ ip_as_int = ipv4_to_int(ip_address)
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+ insertpos = bisect.bisect(sortedarray, ip_as_int)
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+ sortedarray.insert(insertpos, ip_as_int)
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+ retarray.insert(insertpos, lease_rec)
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+ return retarray
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+
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+
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+##############################################################################
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+
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+
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+myfile = open('/var/lib/dhcp/dhcpd.leases', 'r')
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+leases = parse_leases_file(myfile)
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+myfile.close()
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+
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+now = timestamp_now()
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+report_dataset = select_active_leases(leases, now)
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+
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+print('+------------------------------------------------------------------------------')
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+print('| DHCPD ACTIVE LEASES REPORT')
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+print('+-----------------+-------------------+----------------------+-----------------')
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+print('| IP Address | MAC Address | Expires (days,H:M:S) | Client Hostname ')
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+print('+-----------------+-------------------+----------------------+-----------------')
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+
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+for lease in report_dataset:
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+ print('| ' + format(lease['ip_address'], '<15') + ' | ' + \
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+ format(lease['hardware'], '<17') + ' | ' + \
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+ format(str((lease['ends'] - now) if lease['ends'] != 'never' else 'never'), '>20') + ' | ' + \
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+ lease['client-hostname'])
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+
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+print('+-----------------+-------------------+----------------------+-----------------')
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+print('| Total Active Leases: ' + str(len(report_dataset)))
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+print('| Report generated (UTC): ' + str(now))
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+print('+------------------------------------------------------------------------------')
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