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176 lines (148 loc) · 6.82 KB
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#!/usr/bin/env python3
#-------------------------------------------------------------------------------
import os
import sys
import subprocess
import re
import socket
import argparse
import socket
import fcntl
import struct
#-------------------------------------------------------------------------------
_candebug = False
def candebug():
global _candebug
return _candebug
def setcandebug(value):
global _candebug
_candebug = value
def infomsg(msg):
if candebug() == True:
print(msg, flush=True)
def mapstatustoexitcode(status):
if status=="OK":
exitcode = 0
elif status=="WARNING":
exitcode = 1
elif status=="CRITICAL":
exitcode = 2
elif status=="UNKNOWN":
exitcode = 3
else:
exitcode = 4
return exitcode
def exitnagios(status,message):
exitcode = mapstatustoexitcode(status)
print(status+": "+message, flush=True)
sys.exit(exitcode)
#-------------------------------------------------------------------------------
def get_ip_address(ifname):
try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
infomsg(s)
i = fcntl.ioctl(s.fileno(), 0x8915, struct.pack("256s", ifname[:15].encode("utf-8")))
infomsg(i)
a = socket.inet_ntoa(i[20:24])
infomsg(a)
return [a]
except Exception as e:
return []
def allinterfaces():
interfaces = []
for card in socket.if_nameindex():
if (card[1] != "lo"):
interfaces.append(card[1])
infomsg(interfaces)
return interfaces
def findservers(interface,requestmac,timeout):
command = ["/usr/lib/nagios/plugins/check_dhcp", "-i", interface, "-m", requestmac, "-t", str(timeout), "-v"]
infomsg(" ".join(command))
try:
result = subprocess.check_output(command)
output = result.decode("utf-8")
return output
except Exception as e:
return None
def checkdhcp(interface, chaddr, warning, ciaddr, servers, timeout):
interfaceaddress = get_ip_address(interface)
infomsg(interfaceaddress)
requestmac = chaddr
expectedip = re.compile(ciaddr)
validservers = servers.split(",")
for testaddress in interfaceaddress:
if testaddress in validservers:
validservers.remove(testaddress)
output = findservers(interface,requestmac,timeout)
infomsg(output)
sucesses = []
warnings = []
criticals = []
total = -1
if output == None:
warnings.append("the network on interface '"+interface+"' does not have any dhcp server")
else:
lines = output.splitlines()
responses = []
goodones = []
for line in lines:
if line.startswith("Added offer from server"):
parts = line.split()
foundserver = parts[5]
foundip = parts[9]
responses.append(foundserver)
if foundserver not in validservers:
criticals.append("bogus IP server: "+foundserver+" answers "+foundip+" for mac "+requestmac+" on interface '"+interface+"'")
elif expectedip.match(foundip) == False:
criticals.append("bogus IP result: "+foundserver+" answers "+foundip+" for mac "+requestmac+" on interface '"+interface+"'")
else:
goodones.append(foundserver)
if len(criticals)==0:
if len(goodones)<warning:
warnings.append("difference between valid servers and found servers - validservers ["+",".join(validservers)+"] - foundservers ["+",".join(responses)+"] on interface '"+interface+"'")
else:
sucesses.append("foundservers ["+",".join(responses)+"] all answer "+foundip+" for mac "+requestmac+" on interface '"+interface+"'")
total = len(responses)
return sucesses,warnings,criticals,total
def checkall(interfaces, chaddr, warning, ciaddr, servers, timeout):
result = True
infomsg("List of interfaces: "+" ".join(interfaces))
sucesses = []
warnings = []
criticals = []
performance = []
for interface in interfaces:
infomsg("evaluating: "+interface)
temp_sucesses,temp_warnings,temp_criticals,temp_total = checkdhcp(interface, chaddr, warning, ciaddr, servers, timeout)
sucesses = sucesses+temp_sucesses
warnings = warnings+temp_warnings
criticals = criticals+temp_criticals
performance = performance+[interface+"="+str(temp_total)]
if len(criticals)>0:
exitnagios("CRITICAL"," - ".join(criticals)+" | "+" ".join(performance))
if len(warnings)>0:
exitnagios("WARNING"," - ".join(warnings)+" | "+" ".join(performance))
if len(sucesses)>0:
exitnagios("OK"," - ".join(sucesses)+" | "+" ".join(performance))
exitnagios("UNKNOWN","unexpected scenario - successes: "+str(sucesses)+" - warnings: "+str(warnings)+" - criticals: "+str(criticals)+" | "+" ".join(performance))
#-------------------------------------------------------------------------------
def main(forcedargs=None):
parser = argparse.ArgumentParser()
parser.add_argument("-s", "--servers", dest="servers", default="0.0.0.0", help="DHCP server IP (default 0.0.0.0)")
parser.add_argument("-m", "--chaddr", dest="chaddr", default="FF:FF:FF:FF:FF:FF", help="chaddr: Client's MAC address (default FF:FF:FF:FF:FF:FF)")
parser.add_argument("-w", "--warning", dest="warning", default="3", help="if less than this value raise a warning")
parser.add_argument("-c", "--ciaddr", dest="ciaddr", default="0.0.0.0", help="ciaddr: Client's desired IP address (default 0.0.0.0)")
parser.add_argument("-t", "--timeout", dest="timeout", default="10", help="UDP timeout (default 10)")
parser.add_argument("-i", "--interfaces", dest="interfaces", default="", help="comma separated interfaces where to listen")
parser.add_argument("-®", "--debug", action="store_true", dest="debug", default=False, help="be more verbose")
args = parser.parse_args(forcedargs)
setcandebug(args.debug)
if args.interfaces == "":
interfaces = allinterfaces()
else:
interfaces = args.interfaces.split(",")
checkall(interfaces, args.chaddr, int(args.warning), args.ciaddr, args.servers, args.timeout)
#-------------------------------------------------------------------------------
if __name__ == "__main__":
main()
#-------------------------------------------------------------------------------