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TCP Send-Queue

October 3rd, 2012 Leave a comment Go to comments

Script to monitor the TCP Send-Queue.
Send-Q is retrived from the netstat cmd. ex.:

#netstat -anp |more
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

The script syntax example:
#check_sendq -w 900 -c 1000 -f
CRITICAL – Total = 1530 items in TCP Send-Q and 33 MB|sendq_items=1530

#!/bin/bash
#Get current Send-Q number of connections
#Version 1.0
#By Felipe Ferreira October 2012

# Exit codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4
#Variables
port=8080
maxconwarn=10
maxconcrti=30
perfdata=0
total=0
totalcnt=0
MB=0
KB=0


#Check arguments print help
if [ $# -lt 1 ]; then
    echo "Usage: $0  [-w|--warning ] [-c|--critical ] -f(for perdata)"
    exit $STATE_UNKNOWN
fi

#GET ARGUMENTS
while test -n "$1"; do
    case "$1" in
        --help)
            echo "Uso: $0  [-w|--warning ] [-c|--critical ] -f(for perdata)"
            exit $STATE_OK
            ;;
        -h)
            echo "Uso: $0 [-w|--warning ] [-c|--critical ] -f(for perdata)"
            exit $STATE_OK
            ;;
                --warning)
            maxconwarn=$2
            shift
            ;;
        -w)
            maxconwarn=$2
            shift
            ;;
        --critical)
            maxconcrit=$2
            shift
            ;;
        -c)
            maxconcrit=$2
            shift
            ;;
        -f)
            perfdata=1
            ;;
        -perfdata)
            perfdata=1
            ;;
    esac
   shift
done

result=`/bin/netstat -an |/bin/awk '{print $3}' |/bin/grep -e ^[2-9]`
for line in $result; do
 total=`echo "$total+$line" | bc -q`;
 totalcnt=`echo "$totalcnt+1" | bc -q`;
done

MB=$(($total / 2**20))
KB=$(($total / 2**10))

if ( [ $MB -eq 0 ] && [ $KB -ne 0 ])
then
 MSG="Total = $totalcnt items in TCP Send-Q and $KB KB"
elif [ $KB -eq 0 ]
then
 MSG="Total = $totalcnt items in TCP Send-Q and $total Bytes"
else
 MSG="Total = $totalcnt items in TCP Send-Q and $MB MB"
fi

if [ $totalcnt -ge $maxconwarn ]; then
        OUTPUT="WARNING - $MSG"
        exitstatus=$STATE_WARNING
fi

if [ $totalcnt -ge $maxconcrit ]; then
        OUTPUT="CRITICAL - $MSG"
        exitstatus=$STATE_CRITICAL
fi

if [ $totalcnt -lt $maxconwarn ];then
   OUTPUT="OK - $MSG"
   exitstatus=$STATE_OK
fi

if [ $perfdata -eq 1 ]; then
    OUTPUT="$OUTPUT|sendq_items=$totalcnt"
fi


echo $OUTPUT
exit $exitstatus

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