86 lines
2.4 KiB
Python
Executable File
86 lines
2.4 KiB
Python
Executable File
#!/usr/bin/python
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# Monitor leases if ISC-DHCPD
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import os, sys, time, re, calendar
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conf_file = None
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for path in [ '/etc/dhcpd.conf', '/etc/dhcp/dhcpd.conf', '/usr/local/etc/dhcpd.conf' ]:
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if os.path.exists(path):
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conf_file = path
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break
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leases_file = None
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for path in [
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'/var/lib/dhcp/db/dhcpd.leases',
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'/var/lib/dhcp/dhcpd.leases',
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'/var/lib/dhcpd/dhcpd.leases', # CentOS
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]:
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if os.path.exists(path):
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leases_file = path
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break
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# If no configuration and leases are found, we assume that
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# no dhcpd is running.
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if not conf_file or not leases_file:
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sys.exit(0)
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pidof_dhcpd = os.popen("pidof dhcpd").read().strip()
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sys.stdout.write('<<<isc_dhcpd>>>\n[general]\nPID: %s\n' % pidof_dhcpd)
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sys.stdout.write('[pools]\n')
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def parse_config(filename):
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for line in file(filename):
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line = line.strip()
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if line.startswith("include"):
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included_file = re.search('include\s+"(.*)"', line).group(1)
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parse_config(included_file)
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elif line.startswith("range"):
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sys.stdout.write(line[5:].strip("\t ;") + "\n")
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parse_config(conf_file)
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# lease 10.1.1.81 {
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# starts 3 2015/09/09 11:42:20;
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# ends 3 2015/09/09 19:42:20;
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# tstp 3 2015/09/09 19:42:20;
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# cltt 3 2015/09/09 11:42:20;
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# binding state free;
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# hardware ethernet a4:5e:60:de:1f:c3;
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# uid "\001\244^`\336\037\303";
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# set ddns-txt = "318c69bae8aeae6f8c723e96de933c7149";
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# set ddns-fwd-name = "Sebastians-MBP.dhcp.mathias-kettner.de";
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# }
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sys.stdout.write('[leases]\n')
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now = time.time()
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ip_address = None
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binding_state = None
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seen_addresses = set()
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for line in file(leases_file):
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parts = line.strip().rstrip(";").split()
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if not parts:
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continue
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if parts[0] == "lease":
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ip_address = parts[1]
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elif parts[0] == "ends":
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if parts[1] != "never":
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ends_date_string = parts[2] + " " + parts[3]
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ends_date = calendar.timegm(time.strptime(ends_date_string, "%Y/%m/%d %H:%M:%S"))
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if ends_date < now:
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ip_address = None # skip this address, this lease is outdated
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elif parts[0] == "binding" and parts[1] == "state":
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binding_state = parts[2]
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elif parts[0] == "}":
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if ip_address and binding_state == "active" and ip_address not in seen_addresses:
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sys.stdout.write("%s\n" % ip_address)
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seen_addresses.add(ip_address)
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ip_address = None
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binding_state = None
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