Thursday, May 5, 2022

[SOLVED] Netcat auto reconnect on disconnection

Issue

I've set up a series of netcat connections in a Bash/Debian Linux environment to remote servers which periodically send me messages. I'm continuously writing the results of these messages to a local file as so:

nc 192.168.1.38 23 >> results
nc 192.168.1.39 4501 >> results
nc 192.168.1.40 8080 >> results

Everything works great. But periodically, one of the remote servers kills the netcat connection (i.e. performance reasons, overloading, etc.). When this happens I have to manually reconnect to the server. Is there an automated method of immediately reconnecting, so that no intermediary messages are lost?

Suggestions in bash or python preferred.


Solution

You can use an infnite loop. When netcat ends it'll just start again... Infinitely...

Try this (bash script)

while true
do
    nc 192.168.1.38 23 >> results
    nc 192.168.1.39 4501 >> results
    nc 192.168.1.40 8080 >> results
done


Answered By - Adrian Webster
Answer Checked By - Clifford M. (WPSolving Volunteer)
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