24 lines
1015 B
Plaintext
24 lines
1015 B
Plaintext
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#!/usr/bin/env python
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import re
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import datetime
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def count_dhcp_leases():
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regex_leaseblock = re.compile(r"lease (?P<ip>\d+\.\d+\.\d+\.\d+) {(?P<config>[\s\S]+?)\n}")
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regex_properties = re.compile(r"\s+(?P<key>\S+) (?P<value>[\s\S]+?);")
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leases = 0
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with open("/var/lib/dhcp/dhcpd.leases") as lease_file:
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macs = set()
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for match in regex_leaseblock.finditer(lease_file.read()):
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block = match.groupdict()
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properties = {key: value for (key, value) in regex_properties.findall(block['config'])}
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if properties['binding'].split(' ')[1] == 'active' and properties['ends'] != 'never':
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dt_ends = datetime.datetime.strptime(properties['ends'][2:], "%Y/%m/%d %H:%M:%S")
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if dt_ends > datetime.datetime.utcnow() and properties['hardware'].startswith('ethernet'):
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macs.add(properties['hardware'][9:])
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leases = len(macs)
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return leases
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if __name__ == "__main__":
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print count_dhcp_leases()
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