checks/isc_dhcpd

   1 #!/usr/bin/python
   2 # -*- encoding: utf-8; py-indent-offset: 4 -*-
   3 # +------------------------------------------------------------------+
   4 # |             ____ _               _        __  __ _  __           |
   5 # |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
   6 # |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
   7 # |           | |___| | | |  __/ (__|   <    | |  | | . \            |
   8 # |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
   9 # |                                                                  |
  10 # | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
  11 # +------------------------------------------------------------------+
  12 #
  13 # This file is part of Check_MK.
  14 # The official homepage is at http://mathias-kettner.de/check_mk.
  15 #
  16 # check_mk is free software;  you can redistribute it and/or modify it
  17 # under the  terms of the  GNU General Public License  as published by
  18 # the Free Software Foundation in version 2.  check_mk is  distributed
  19 # in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
  20 # out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
  21 # PARTICULAR PURPOSE. See the  GNU General Public License for more de-
  22 # tails. You should have  received  a copy of the  GNU  General Public
  23 # License along with GNU Make; see the file  COPYING.  If  not,  write
  24 # to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
  25 # Boston, MA 02110-1301 USA.
  26
  27 isc_dhcpd_default_levels = (15.0, 5.0)
  28
  29 # Example output from agent:
  30 # <<<isc_dhcpd>>>
  31 # [general]
  32 # PID: 3670
  33 # [pools]
  34 # 10.0.1.1 10.0.1.254
  35 # [leases]
  36 # 10.0.1.16
  37 # 10.0.1.24
  38 # 10.0.1.26
  39 # 10.0.1.27
  40 # 10.0.1.34
  41 # 10.0.1.36
  42 # 10.0.1.45
  43 # 10.0.1.50
  44 # 10.0.1.53
  45 # 10.0.1.57
  46
  47
  48 def parse_isc_dhcpd(info):
  49     def ip_to_number(ip):
  50         number = 0
  51         factor = 1
  52         for part in ip.split('.')[::-1]:
  53             number += factor * int(part)
  54             factor *= 256
  55         return number
  56
  57     parsed = {
  58         "pids": [],
  59         "pools": {},
  60         "leases": [],
  61     }
  62
  63     mode = None
  64     for line in info:
  65         if line[0] == '[general]':
  66             mode = "general"
  67         elif line[0] == '[pools]':
  68             mode = "pools"
  69         elif line[0] == '[leases]':
  70             mode = "leases"
  71
  72         elif mode == "general":
  73             if line[0] == "PID:":
  74                 parsed["pids"] = map(int, line[1:])
  75
  76         elif mode == "pools":
  77             if 'bootp' in line[0]:
  78                 line = line[1:]
  79             start, end = line[0], line[1]
  80             item = "%s-%s" % (start, end)
  81             parsed["pools"][item] = (ip_to_number(start), ip_to_number(end))
  82
  83         elif mode == "leases":
  84             parsed["leases"].append(ip_to_number(line[0]))
  85
  86     return parsed
  87
  88
  89 def inventory_isc_dhcpd(parsed):
  90     return [(item, "isc_dhcpd_default_levels") for item in parsed["pools"]]
  91
  92
  93 def check_isc_dhcpd(item, params, parsed):
  94     if len(parsed["pids"]) == 0:
  95         yield 2, "DHCP Daemon not running"
  96     elif len(parsed["pids"]) > 1:
  97         yield 1, "DHCP Daemon running %d times (PIDs: %s)" % (len(parsed["pids"]), ", ".join(
  98             map(str, parsed["pids"])))
  99
 100     if item not in parsed["pools"]:
 101         return
 102
 103     range_from, range_to = parsed["pools"][item]
 104     num_leases = range_to - range_from + 1
 105     num_used = 0
 106     for lease_dec in parsed["leases"]:
 107         if lease_dec >= range_from and lease_dec <= range_to:
 108             num_used += 1
 109
 110     for check_result in check_dhcp_pools_levels(num_leases - num_used, num_used, None, num_leases,
 111                                                 params):
 112         yield check_result
 113
 114
 115 check_info["isc_dhcpd"] = {
 116     'parse_function': parse_isc_dhcpd,
 117     'inventory_function': inventory_isc_dhcpd,
 118     'check_function': check_isc_dhcpd,
 119     'service_description': 'DHCP Pool %s',
 120     'group': 'win_dhcp_pools',
 121     'has_perfdata': True,
 122     'includes': ["dhcp_pools.include"],
 123 }