check_noipv6

#!/usr/bin/env python3
#-------------------------------------------------------------------------------

import argparse
import sys
import os
import subprocess
import netifaces
import ipaddress

#-------------------------------------------------------------------------------

_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 exitnagios(status,message):
    if status=="OK":
        exitcode = 0
    elif status=="WARNING":
        exitcode = 1
    elif status=="CRITICAL":
        exitcode = 2
    elif status=="UNKNOWN":
        exitcode = 3
    else:
        exitcode = 4
    print(status+": "+message, flush=True)
    sys.exit(exitcode)

#-------------------------------------------------------------------------------

def dointerfacenetworkcheck(interface):
    interfaces = netifaces.interfaces()
    found_addrs = []
    for item in interfaces:
        if item == interface:
            addrs = netifaces.ifaddresses(interface)
            if netifaces.AF_INET6 in addrs.keys():
                for entry in addrs[netifaces.AF_INET6]:
                    address = ipaddress.IPv6Address(entry["addr"])
                    found_addrs.append(address)
            break
    infomsg(str(found_addrs))

    if len(found_addrs)==0:
        exitnagios("OK","no IPv6 addresses for interface "+interface+" | total=0")
    else:
        invalid_addrs = []
        for item in found_addrs:
            infomsg(str(item))
            if item.is_global:
                invalid_addrs.append(str(item))

        if len(invalid_addrs)==0:
            exitnagios("OK","no global IPv6 addresses for interface "+interface+" | total="+str(len(invalid_addrs)))
        else:
            exitnagios("CRITICAL","there are global IPv6 addresses for interface "+interface+" - "+str(invalid_addrs)+" | total="+str(len(invalid_addrs)))

#-------------------------------------------------------------------------------

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-I", "--interface",                               dest="interface",        default="",                                   help="interface to check")
    parser.add_argument("-®", "--debug",             action="store_true",  dest="debug",            default=False,                                help="be more verbose")
    args = parser.parse_args()

    setcandebug(args.debug)

    if (args.interface == ""):
        exitnagios("CRITICAL","interface not defined")

    dointerfacenetworkcheck(args.interface)

main()

#-------------------------------------------------------------------------------