check_hwclock

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

import argparse
import time
import datetime
import os
import sys

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

_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)

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

#collect arguments
def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument("-w", "--warning",           action="store",       type=int,                default=5,                                    help="if this number or more, it becomes warning state (default 5")
    parser.add_argument("-c", "--critical",          action="store",       type=int,                default=10,                                   help="if this number or more, it becomes critical state (default 10")
    parser.add_argument("-t", "--timeout",           action="store",       type=int,                default=90,                                   help="seconds to wait before timeout, default 90; SKY each min it should be over 60")
    parser.add_argument("-®", "--debug",             action="store_true",  dest="debug",            default=False,                                help="be more verbose")
    args = parser.parse_args()

    return args

def check_rtc_utc():
    adjfilename = "/etc/adjtime"
    if os.path.isfile(adjfilename)==True:
        filehandle = open(adjfilename,"rt")
        hwclockdata = filehandle.read().splitlines()
        filehandle.close()
        
        is_rtc_utc = (hwclockdata[2].strip().upper() == "UTC")
        if is_rtc_utc == False:
            print("CRITICAL:","hwclock is not UTC", flush=True)
            sys.exit(2)

def get_rtc_data():
    filehandle = open("/proc/driver/rtc","rt")
    rtcdata = filehandle.read().splitlines()
    filehandle.close()

    date = ""
    time = ""
    for line in rtcdata:
        parts = line.split(":",1)
        key = parts[0].strip()
        value = parts[1].strip()
        if key == "rtc_date":
            date = value.split("-")
        if key == "rtc_time":
            time = value.split(":")
        if key == "batt_status":
            if value != "okay":
                print("CRITICAL:","rtc battery not OKAY", flush=True)
                sys.exit(2)

    rtctime = datetime.datetime(int(date[0]),int(date[1]),int(date[2]),int(time[0]),int(time[1]),int(time[2]),tzinfo=datetime.timezone.utc)
    return int(rtctime.timestamp())

def evaluate(difference):
    args = parse_args()

    setcandebug(args.debug)

    if (difference>=args.critical):
        print("CRITICAL:","The hwclock offset is "+str(difference)+"s | difference="+str(difference), flush=True)
        sys.exit(2)
    elif (difference>=args.warning):
        print("WARNING:","The hwclock offset is "+str(difference)+"s | difference="+str(difference), flush=True)
        sys.exit(1)
    else:
        print("OK:","The hwclock offset is "+str(difference)+"s | difference="+str(difference), flush=True)
        sys.exit(0)

check_rtc_utc()
rtctime = get_rtc_data()
infomsg(rtctime)
systime = int(time.time())
infomsg(systime)
difference = abs(rtctime - systime)
evaluate(difference)

print("CRITICAL:","Internal error", flush=True)
sys.exit(2)