check_tcp via string with warnings

[deelight]

Hi Guys,

i've got a problem with the check_tcp plugin and counld not find any plugin who works like i need.
I'm sending a string to a port via check_tcp and get a number back, in this case 2580. On this number i need to define warning and crital values.

Example:

Code: Select all

/usr/lib/nagios/plugins# ./check_tcp -H XXXXXXXXXX -p 51031 -E -s "status\r\n" -d 1 -t 30 -e "SOMEThING"
TCP WARNING - Unexpected response from host/socket: [b]2580[/b]|time=0,000358s;;;0,000000;30,000000

I need somthing like

Code: Select all

/usr/lib/nagios/plugins# ./check_tcp -H XXXXXXXXXX -p 51031 -E -s "status\r\n" -d 1 -t 30 -w  2500 -c 3000

Is there anyway to do this or any plugin i've not found yet?

[rkennedy]

The check_tcp command is generating warning / critical based on the response time from the TCP port.

To help you find a plugin that will work for you, what kind of application is this?

[deelight]

It's a custom tool that looks into a folder at another location and show how many file are waiting. i have no other way to monitor this.
I need, like in check_smtp to define a warning/critical on the value i get beack when i ask the port for his status.

[hsmith]

You could write a wrapper script that executes the plugin, and exit 0/1/2 depending on what it finds using some if statements.

Do you follow?

[deelight]

yes, i just had hoped that there would be an easyier way ...

[rkennedy]

As @hsmith, I think a bash script would be an easy enough way to parse the data for you.

For an example on how to write one, see http://www.yourownlinux.com/2014/06/how ... cript.html

Let us know if you need any further assistance!

[deelight]

I build a small bash script that is working basicly... i'm just struggling with the difference between when it is a warning and a critical.

Code: Select all

if [ $RESPONSE -lt $WARN ]
then
    echo "OK- $RESPONSE $MSG"
    exit 0
elif [ $RESPONSE -ge $WARN -lt $CRIT ]
then
    echo "WARNING- $RESPONSE $MSG"
    exit 1
elif [ $RESPONSE -ge $CRIT ]
then
    echo "CRITICAL- $RESPONSE $MSG"
    exit 2
else
echo "UNKNOWN- $output"
exit 3
fi

[hsmith]

i'm just struggling with the difference between when it is a warning and a critical.

Can you elaborate on this a bit?

[deelight]

got it... just switched the order. The problem was, that when it was a critical value it was also a warning value so it exits already with 1. Now i have it like this:

Code: Select all

if [ $RESPONSE -lt $WARN ]
then
    echo "OK- $RESPONSE $MSG"
    exit 0
elif [ $RESPONSE -ge $CRIT ]
then
    echo "CRITICAL- $RESPONSE $MSG"
    exit 2
elif [ $RESPONSE -ge $WARN ]
then
    echo "WARNING- $RESPONSE $MSG"
    exit 1
else
echo "UNKNOWN- $RESPONSE"
exit 3
fi

[deelight]

My current solution looks like this:

Code: Select all

#!/bin/bash
#
[code]# Check TCP Response fuer NAGIOS
#
# by Kjell Krenz
#
#
# Version 0.1
#
#


while [ $# -gt 0 ]
do
    case $1 in
        -h)
            HOST=$2
            shift 2
        ;;
        -p)
            PORT=$2
            shift 2
        ;;
        -s)
            STRING=$2
            shift 2
        ;;
        -w)
            WARN=$2
            shift 2
        ;;
        -c)
            CRIT=$2
            shift 2
        ;;
        -m)
            MSG=$2
            shift 2
        ;;
        *)
            echo "Usage:"
            echo "-h: Host (IP)"
            echo "-p: TCP Port"
            echo "-s: STRING"
            echo "-w: WARNING VALUE"
            echo "-c: CRITICAL VALUE"
            echo "-m: Custom Message Label"
            shift 1
        ;;
    esac
done



exec 3<>/dev/tcp/$HOST/$PORT
echo -en "$STRING\n" >&3
RESPONSE="`cat <&3`"



if [ $RESPONSE -lt $WARN ]
then
    echo "OK- $RESPONSE $MSG"
    exit 0
elif [ $RESPONSE -ge $CRIT ]
then
    echo "CRITICAL- $RESPONSE $MSG"
    exit 2
elif [ $RESPONSE -ge $WARN ]
then
    echo "WARNING- $RESPONSE $MSG"
    exit 1
else
echo "UNKNOWN- $RESPONSE"
exit 3
fi

esac
echo $RESPONSE
exit $EXIT