how to monitor if radclient packet disconnection has been successful received

Question

I have the following question:

I would like to execute in a bash script the radclient command to force the user to be disconnected, but how I can monitor the result of packet disconnection if it has received and acknowledged?

I was thinking something:

#!/bin/bash

echo "User-Name=value1,Acct-Session-Id=value2" | radclient -x IP_XXXXXX:1700 disconnect secret

if packet received and acknowledged then exit code (1) else exit code (0)

Answer 1

You can use grep to check for a line in the output like:

#!/bin/bash
echo "User-Name=value1,Acct-Session-Id=value2" | radclient -x IP_XXXXXX:1700 disconnect secret | grep -Fq 'rad_recv: Disconnect-ACK packet'

Example:

bash script.sh
echo "$?"  ## Can produce 0 or 1 depending on the exit value of `grep`.

If you intend to do the test inside the script of course you can just use if:

if echo "User-Name=value1,Acct-Session-Id=value2" | radclient -x IP_XXXXXX:1700 disconnect secret | grep -Fq 'rad_recv: Disconnect-ACK packet'; then
    ...
else
    ...
fi

Or more readable:

echo "User-Name=value1,Acct-Session-Id=value2" | radclient -x IP_XXXXXX:1700 disconnect secret | grep -Fq 'rad_recv: Disconnect-ACK packet'
if [[ $? -eq 0 ]]; then
    ...
else
    ...
fi

Besides using grep you can also check for the pattern with == and =~:

RESULT=$(echo "User-Name=value1,Acct-Session-Id=value2" | radclient -x IP_XXXXXX:1700 disconnect secret)
[[ $RESULT == *'rad_recv: Disconnect-ACK packet'* ]]
...

Or

[[ $RESULT =~ 'rad_recv: Disconnect-ACK packet' ]]