unix port test script

you may use expect:

http://expect.sourceforge.net/

please see example @ below link:

https://elenako.com/2013/04/04/expect-script-start-telnet-run-commands-close-telnet/

Hi, I want to use existing "telnet" command will complete the test because all the OS have this command come from the build

Is the problem that the telnet hangs for a long time if the port is unreachable?

In that case, you could put the telnet in the background, and kill it if it doesn't complete within a short time (here, 30 seconds), such as:

host=1.1.1.1
port=443
telnet ${host} ${port} </dev/null 2>&1 &
tpid=$!
scount=0
maxcount=30
while [ $scount -lt $maxcount ]; do
  if kill -0 $tpid 2>/dev/null; then
    # Telnet still running - wait a bit more
    ((scount += 1))
    sleep 1
  else
    break
  fi
done
if [ $scount -eq $maxcount ]; then
  kill -9 $tpid
  echo Failed to connect to ${1:-1.1.1.1}:${2:-443} after $maxcount seconds
fi
wait $tpid
rc=$?
echo Return code from telnet was $rc

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By the way, telnet on Debian doesn't support the "-c" parameter

Hi Simon,

I run the script and get the desired output, the platform is RHEL, AIX and Solaris

Fail

Trying 1.1.1.1...
Failed to connect to 1.1.1.1:443 after 30 seconds
./port_test.sh: line 20:  4722 Killed                  telnet ${host} ${port} < /dev/null 2>&1
Return code from telnet was 137

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Success  

Trying 192.168.0.1...
Connected to (192.168.0.1).
Escape character is '^]'.
Connection closed by foreign host.
Return code from telnet was 1

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My current code using nc test to 2 IP address need to replace with this telnet test to output the result to the log file

echo "---------------------------------------------------------------------------" >> /tmp/"$HOSTNAME"-installation.log
nc -z -v -w3 $SERVER_IP 443 2>&1 | tee -a /tmp/"$HOSTNAME"-agent-installation.log
echo "---------------------------------------------------------------------------" >> /tmp/"$HOSTNAME"-installation.log

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#host=192.168.0.1
#port=80
telnet $SERVER_IP 443 </dev/null 2>&1 &
tpid=$!
scount=0
maxcount=30
while [ $scount -lt $maxcount ]; do
  if kill -0 $tpid 2>/dev/null; then
    # Telnet still running - wait a bit more
    ((scount += 1))
    sleep 1
  else
    break
  fi
done
if [ $scount -eq $maxcount ]; then
  kill -9 $tpid
  echo Failed to connect to ${1:-1.1.1.1}:${2:-443} after $maxcount seconds >> /tmp/"$HOSTNAME"-installation.log
fi
wait $tpid
rc=$?
echo Return code from telnet was $rc >> /tmp/"$HOSTNAME"-agent-installation.log

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Standard output on console

Trying 10.21.151.160...
./port_test.sh: line 30:  4809 Killed                  telnet $SERVER_IP 443 < /dev/null 2>&1

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The installation log output

Failed to connect to 1.1.1.1:443 after 30 seconds
Return code from telnet was 137

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I need to run the port test for 2 different IP address, can complete in the same script?

The standard output error can suppress?

Hi, I updated it to same file and I change the error code message to successful connect work that make sense because I don't need the error code.

Regarding the code I tested in single script it work great but integrate to my my existing script need your advice how to test for 6 IP address based on the condition.

This is my existing code

if  [ "$12" == "Apple" ] || [ "$34" == "Orange" ]

	then

pingserv $SERVER1_IP
pingserv $SERVER2_IP
	
	elif  [ "$56" == "Watermelon" ] || [ "$78" == "Pineapple" ]	

pingserv $SERVER3_IP
pingserv $SERVER4_IP

else

pingserv $SERVER5_IP
pingserv $SERVER6_IP

fi

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Thanks

You could include the function code into your script, but it might be easier to put the code in a file of its own, and call it pingserv.sh

#!/bin/bash

function pingserv {
   (function body as before)
}

pingserv $1

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Make it executable (chmod +x pingserv.sh) and put it somewhere in your PATH (/usr/local/bin, for example).  then you can call it from another script, like

#!/bin/bash

if [ $1 = "apple ]; then
   pingserv.sh $SERVER1_IP
   pingserv.sh $SERVER2_IP
elif [ $1 = "banana" ] || [ $1 = "orange ]; then
   pingserv.sh $SERVER3_IP
   pingserv.sh $SERVER4_IP
else
   pingserv.sh $SERVER5_IP
   pingserv.sh $SERVER6_IP
fi

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Couple of things in your script = you use "=" in "if [" tests (it's only "==" in "if [[" tests), and in a Bash script you only have $1 to $9 - $12 is not a valid variable name.

Hi Simon, can you make all the code in the single file instead using separate file?

Yes, no problem with that. Just include the pingserv function, and use the "if" test section I gave above  with lines such as
    pingserv $SERVER1_IP

Thanks Simon