#!/bin/sh

E_OK=0;E_WARN=1;E_CRIT=2;E_UNKNOWN=3

#Defaults
WARN=100
CRIT=200
WARNPCT=10
CRITPCT=20
PKTCNT=5
PKTSIZE=6050

res=$E_OK;txt="OK"

usage()
{
cat <<EOF
usage: $0 -H host [OPTIONS]
This script checks ping to host and verifies packets loss and round trip time
OPTIONS:
   -h       Help
   -w wrtt  WARNING  RTT
   -c crtt  CRITICAL RTT
   -W wpct  WARNING  Packets loss %
   -C cpct  CRITICAL Packets loss %
   -p num   Number of packets
   -s size  Packet size
EOF
}

while getopts H:c:w:C:W:p:s: OPTION
do
     case $OPTION in
        H)
           CHECKHOST=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        c)
           CRIT=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        w)
           WARN=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        C)
           CRITPCT=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        W)
           WARNPCT=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        p)
           PKTCNT=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        s)
           PKTSIZE=`echo $OPTARG | grep -v "^-"`
           [ ! "$?" = 0 ] && echo "Error: missing or illegal option value" && exit $STATE_UNKNOWN;;
        ?)
           usage; exit $STATE_UNKNOWN;;
     esac
done

if [ -z "$CHECKHOST" ]; then usage; exit $STATE_UNKNOWN; fi

cmd_res="$(ping $CHECKHOST -c $PKTCNT -s $PKTSIZE -W 1 -M dont|tail -n2)"

PCT=$(echo "$cmd_res"|head -n1|awk '{print $6}'|tr -d '%')

TIME=$(echo "$cmd_res"|tail -n1|awk -F '/' '{print $5}')
if [ -z "$TIME" ]; then TIME=65565; fi

if [ $PCT -ge $WARNPCT ] && [ $res -lt $E_WARN ]
 then
   res=$E_WARN;txt="WARNING"
   if [ $PCT -ge $CRITPCT ] && [ $res -lt $E_CRIT ]
    then
      res=$E_CRIT;txt="CRITICAL"
   fi
fi

if [ $(echo "$TIME >= $WARN"|bc) -ne 0  ] && [ $res -lt $E_WARN ]
 then
   res=$E_WARN;txt="WARNING"
   if [ $(echo "$TIME >= $CRIT"|bc) -ne 0  ] && [ $res -lt $E_CRIT ]
    then
      res=$E_CRIT;txt="CRITICAL"
   fi
fi

echo "$txt: Host $CHECKHOST - $PCT% packet loss (warn:$WARNPCT,crit:$CRITPCT), AVG rtt $TIME (warn:$WARN,crit:$CRIT)|PacketLoss=$PCT%;$WARNPCT;$CRITPCT;0;100 RTT=${TIME}ms;$WARN;$CRIT;;"
exit $res