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Nirick
 asked on

Script for testing ping and telnet

Hello,
Here is a script for testing the ping and telnet based on a file containing a list of servers.
I am looking to improve this script by sending the result like this:
Hostname;IPAddr;PingTest;TelnetTest
Srv1;192.168.2.1;OK;OK
Srv2;192.168.2.2;OK;NOK
Srv3;192.168.2.3;NOK;NOK

Thank you for help!
Host-PortFile.txt
TestTelnet.sh
LinuxLinux NetworkingShell ScriptingProgramming Languages-OtherScripting Languages

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Last Comment
Nirick

8/22/2022 - Mon
woolmilkporc

Hi,

I tried to leave most parts of your script as they were. I removed the old ouput messages, and I had to turn the two loops into one and thus two functions into one.

I used the "host" command to get the hostname from its IP. The output of this command is different between OSes, so if you get errors or undesired output please post the result of "host xxx.xxx.xxx.xxx".

#!/bin/bash
#bash check ping et telnet OOB.
#set -xv;
#
#clear
SetParam() {
export SRVFILE="Host_PortFile.txt"
export TIME=`date +%d-%m-%Y_%H.%M.%S`
export port=23
export SHELL_LOG="`basename $0`.log"
}

Check_Hosts() {

SetParam
cat $SRVFILE | while read next
do

server=`echo $next | cut -d : -f1`
port=`echo $next | awk -F":" '{print $2}'`
servername=$(host $server 2>/dev/null | awk '{sub("\\.$","",$NF); print $NF}')

OUTPUT="$servername;$server"
ping -i 2 -c 6 $server > /dev/null 2>&1

if [ $? -eq 0 ] ; then
OUTPUT=${OUTPUT}";OK"
else
OUTPUT=${OUTPUT}";NOK"

fi

TELNETCOUNT=`sleep 5 | telnet $server $port 2>/dev/null | grep -v "Connection refused" | grep "Connected to" | grep -v grep | wc -l `

if [ $TELNETCOUNT -eq 1 ] ; then

OUTPUT=${OUTPUT}";OK"
else
OUTPUT=${OUTPUT}";NOK"

fi
echo "$OUTPUT"
done;
}
Main() {
Check_Hosts
}
SetParam
Main | tee -a $SHELL_LOG

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Nirick

ASKER
Hi,

Thanks for your response!
The script works, for the name resolution I added getent hosts :

servername=$(getent hosts $server 2>/dev/null | awk '{sub("\\.$","",$NF); print $NF}')

Thanks again!
woolmilkporc

sub("\\.$","",$NF)  in the awk code is meant to remove the trailing dot shown by "hosts".

In order to remove everything after the first dot (i.e. strip the whole domain suffix) use

sub("\\..*$","",$NF)
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rwheeler23
gheist

nmap network scanner does same and much more.
Nirick

ASKER
Hello,

There is the final script :

#!/bin/bash
#bash check ping et telnet OOB.
#set -xv;
#
#clear
debut=`date +%S`

SetParam() {
export SRVFILE="Host_PortFile2.txt"
export TIME=`date +%d-%m-%Y_%H.%M.%S`
export port=23
export SHELL_LOG="`basename $0`.log"
}

Check_Hosts() {

SetParam
cat $SRVFILE | while read next
do

server=`echo $next | cut -d : -f1`
port=`echo $next | awk -F":" '{print $2}'`
servername=$(getent hosts $server 2>/dev/null | awk '{sub("\\.$","",$NF); print $NF}')

OUTPUT="$servername;$server"
ping -i 3 -c 8 $server > /dev/null 2>&1

if [ $? -eq 0 ] ; then
OUTPUT=${OUTPUT}";\E[32mUP\E[0m"
else
OUTPUT=${OUTPUT}";\E[31mDOWN\E[0m"

fi

TELNETCOUNT=`sleep 5 | telnet $server $port 2>/dev/null | grep -v "Connection refused" | grep "Connected to" | grep -v grep | wc -l `

if [ $TELNETCOUNT -eq 1 ] ; then

OUTPUT=${OUTPUT}";\E[32mUP\E[0m"
else
OUTPUT=${OUTPUT}";\E[31mDOWN\E[0m"

fi
echo -e "$OUTPUT"
done;


fin=`date +%S`
diff=$(($fin-$debut))
 

echo "Test fini en $diff secondes."
}


Main() {
Check_Hosts
}
SetParam
Main | tee -a $SHELL_LOG

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I try to calculate the time it takes to run the script by calculating the difference between start time and end time :
diff=$(($fin-$debut))

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I also tried the $ SECONDS function but when it exceeds 1min , I have a result of type 0 seconds.

Another question, is it possible to calculate the hosts that are OK ? For example have a result like this: 13 hosts are UP , DOWN 5 hosts are .

Thanks for help !
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woolmilkporc

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Nirick

ASKER
Hello,

Thanks again. The needed result is telnet, so used the last line only ;
echo "$TELNETFAIL hosts OOB down."

The hosts are dialer interfaces. The ping is used only to force up these interfaces.
When ping counter / interval are low, some dialer interfaces stay down, so telnet test fail.

PING 192.168.2.70 (192.168.2.70) 56(84) bytes of data.
64 bytes from 192.168.2.70: icmp_req=6 ttl=252 time=46.2 ms
64 bytes from 192.168.2.70: icmp_req=7 ttl=252 time=46.0 ms
64 bytes from 192.168.2.70: icmp_req=8 ttl=252 time=46.2 ms
64 bytes from 192.168.2.70: icmp_req=9 ttl=252 time=46.1 ms
64 bytes from 192.168.2.70: icmp_req=10 ttl=252 time=46.0 ms
^C
--- 192.168.2.70 ping statistics ---
11 packets transmitted, 5 received, 54% packet loss, time 9998ms
rtt min/avg/max/mdev = 46.047/46.168/46.297/0.217 ms

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See packet loss.
I didnt found any other way than putting high counters / interval
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woolmilkporc

OK,

if your interfaces behave as described raising counters (and possibly intervals) seems a viable solution.

Besides that, does the script work as expected?
Nirick

ASKER
Hello,

The script works I've implemented in prod env this morning.
Thanks for help !