Item preprocessing with external check

[prasad_SL]

I am testing zabbix 3.4 to monitor old PSTN switch. It only has telnet login. so I used External check with "expect" script. the output gives the list of current alarms in the system. but the problem is the text item contain blank lines. so the regex exit on the first match.

Output,

Header line

Header line 2

Alarm xxxxxx11

Alarm xxxxxx22

Alarm xxxxxx33

END

I am using Dependent Item from this and doing a pre-processing..
^Alarm (.+)

Capture group only contain Alarm xxxxxx11.
I am sure this is due to blank line, next to the mach.
Unable to find a method to remove those blank spaces.

Or is there better way to monitor this node ?
Please help ..

[prasad_SL]

I found a solution. If anyone interested, this is the way I did...


1. Modified external telnet script to dump the output to a file (log)
2. Read the file and extract lines specific regex and put in to another file; (marked as Newlog)
3. Append the file content by formatting according to SNMP lines


I did it by 6 scripts; including telnet script.
As follows.

1. telnet script

#!/usr/bin/expect

spawn telnet x.x.x.x
send "username"
send "\r"
send "password"
send "\r"
expect "Windows NT Domain:"
send "\r"
expect ">"
send "mml -a"
send "\r"
expect "<"
send "alarmlist command;"
send "\r"
send "exit \r"
send "exit \r"


2. Main command script : : this is the external script places at /usr/lib/zabbix/externalscripts
Alarm dump location is /home/appliance/prasadAXEscripts

#!/bin/bash

/usr/lib/zabbix/externalscripts/isc4A1.sh | tee /home/appliance/prasadAXEscripts/log.txt
sleep 0.25
/home/appliance/prasadAXEscripts/Tony_v1.bash
sleep 0.1

3. Here Tony_v1.bash will trigger 3 new scripts ...

#!/bin/bash

#Extracting A1 and A2 alarms from capture file
/home/appliance/prasadAXEscripts/Mark42AXEAlarmExtractor_v1.sh
sleep 0.1

#Compare New list with Old list and genarate Triggers
/home/appliance/prasadAXEscripts/Mark43AXEFileAnalyser_v1.bash
sleep 0.1

#Tunneling genarated Triggers to Zabbix SNMP train
/home/appliance/prasadAXEscripts/Mark47SnmpTunnel_v1.sh
sleep 0.1


Following are those 3 files...

If you have any better way or issues ...please comment.


4. Mark42AXEAlarmExtractor_v1.sh

#!/bin/bash

REGEX="^(A1|A2).*"

file="/home/appliance/prasadAXEscripts/PrasadAXE10log.txt"
while IFS= read -r line
do
if [[ "$line" =~ $REGEX ]]
then
echo "$line" >> /home/appliance/prasadAXEscripts/PrasadAXE10logNEW.txt
fi
done < "$file"


5. Mark43AXEFileAnalyser_v1.bash

#!/bin/bash

#reading new file to arrayNEW
file="/home/appliance/prasadAXEscripts/PrasadAXE10logNEW.txt"
while IFS= read -r line || [[ -n "$line" ]];
do
line=$(echo "$line" | tr -d '\r')
arrayNEW+=("$line")
done < "$file"

#reading old file to arrayOLD
file="/home/appliance/prasadAXEscripts/PrasadAXE10logOLD.txt"
while IFS= read -r line || [[ -n "$line" ]];
do
line=$(echo "$line" | tr -d '\r')
arrayOLD+=("$line")
done < "$file"


for ((k=0; k < ${#arrayNEW[*]}; k++))
do
for ((z=0; z < ${#arrayOLD[*]}; z++))
do
if [ "${arrayNEW[k]}" = "${arrayOLD[z]}" ];
#then echo "${arrayNEW[k]}"
#then arrayBoth+=("${arrayNEW[k]}")
then
break
fi

var=$((z+1))
if [ $var = ${#arrayOLD[*]} ];
#then echo "Not in old file..${arrayNEW[k]}"
then arrayNewOnly+=("${arrayNEW[k]}")
fi
done

if [ ${#arrayOLD[*]} = 0 ];
#then echo "Not in old file..${arrayNEW[k]}"
then arrayNewOnly+=("${arrayNEW[k]}")
fi

done


for ((a=0; a < ${#arrayOLD[*]}; a++))
do
for ((b=0; b < ${#arrayNEW[*]}; b++))
do
if [ "${arrayOLD[a]}" = "${arrayNEW[b]}" ];
then
break
fi

var=$((b+1))
if [ $var = ${#arrayNEW[*]} ];
#then echo "Not in old file..${arrayOLD[k]}"
then arrayOldOnly+=("${arrayOLD[a]}")
fi
done

if [ ${#arrayNEW[*]} = 0 ];
#then echo "Not in old file..${arrayNEW[k]}"
then arrayOldOnly+=("${arrayOLD[a]}")
fi



done

# File appending
>/home/appliance/prasadAXEscripts/Mark11snmptraps.txt

for ((p=0; p < ${#arrayNewOnly[*]}; p++))
do
echo "${arrayNewOnly[p]} :: RatFire" >> /home/appliance/prasadAXEscripts/Mark11snmptraps.txt
done

for ((q=0; q < ${#arrayOldOnly[*]}; q++))
do
echo "${arrayOldOnly[q]} :: RatClear" >> /home/appliance/prasadAXEscripts/Mark11snmptraps.txt
done

# File swapping
>/home/appliance/prasadAXEscripts/PrasadAXE10logOLD.txt

cp /home/appliance/prasadAXEscripts/PrasadAXE10logNEW.txt /home/appliance/prasadAXEscripts/PrasadAXE10logOLD.txt

>/home/appliance/prasadAXEscripts/PrasadAXE10logNEW.txt


6. Mark47SnmpTunnel_v1.sh

#!/bin/bash

ratT="$(date +'%Y%m%d.%H%M%S')"
ratip="x.x.x.x"
file="/home/appliance/prasadAXEscripts/Mark11snmptraps.txt"

while IFS= read -r line
do
echo "$ratT ZBXTRAP $ratip PrasadAXEalarm $line" >> /var/log/snmptrap/snmptrap.log
done < "$file"