Current File : //usr/local/nagios/libexec/check_time_skew

#!/bin/sh

# Check for clock skew on hosts not running ntpd

# v1.0 (C) 2008 Stuart Teasdale <Stuart.Teasdale@opsview.com>

program=/usr/sbin/ntpdate
program_opts="-q pool.ntp.org"

warntime=1
crittime=2

# helper functions
. /usr/local/nagios/libexec/utils.sh

usage()
{ 
  cat <<EOF
    Usage: `basename $0` [-w <seconds>] [-c <seconds>] [-n <ntpserver>]

    Check the time of the machine compared to an ntp server (pool.ntp.org
    by default) and report a warn or error if it is outside of specified 
    boundaries
EOF
  exit 1
}

main()
{
  parse_arguments "$@"
  timecheck
}

# convert exit code to Nagios output
exitcode_to_state()
{
  if [ "$#" != 1 ]; then
    echo "Warning - exitcode_to_state called incorrectly ($@)"
    return 1
  fi
  local exitcode="$1"
  case "$exitcode" in
    $STATE_OK) echo "OK";;
    $STATE_WARNING) echo "WARNING";;
    $STATE_CRITICAL) echo "CRITICAL";;
    $STATE_UNKNOWN) echo "UNKNOWN";;
    $STATE_DEPENDENT) echo "DEPENDENT";;
    *) echo "exitcode_to_state called with bad exitcode \"$exitcode\"" >&2;
       echo "UNKNOWN";;
  esac
}

timecheck()
{
  rc=$STATE_OK
  msg=""
  skew=`$program $program_opts 2>/dev/null | grep ntpdate |awk '{ print $10}'`  
  if [ -z "$skew" ]; then
    msg="Problem executing $program";
    rc=$STATE_UNKNOWN
  else
    msg="$msg clock skew of ${skew}s - Machine time is `date`"
  
    if [ `echo "$skew < 0"|bc` = 1 ]; then skew=`echo "0 - $skew"|bc` ; fi
    if [ `echo "$skew > $warntime"|bc` = 1 ]; then
      rc=$STATE_WARNING
    fi
    if [ `echo "$skew > $crittime"|bc` = 1 ]; then
      rc=$STATE_CRITICAL
    fi
  fi
  echo "TIME `exitcode_to_state $rc` - $msg" 
  return $rc
  
}

parse_arguments()
{
  while getopts "hw:c:n:" opt; do
    case "$opt" in
      h) usage;;
      w) warntime="$OPTARG";;
      c) crittime="$OPTARG";;
      n) program_opts="-q $OPTARG";;
    esac
  done
}

main "$@"