CODEWITHSUNDEEP
bash
Sylva1n
Sylva1n

Reputation: 119

Bash: monitoring TCP socket activity

I use mpg123 to read an mp3 webradio stream (port 8000). Sometimes, the webradio server stops but mpg123 doesn't quit. Also, if the network on my machine fails, mpg123 won't quit either. I would like to monitor mpg123 activity using a bash script launched by cron. Something like this:

tcpdump -i eth0  port 8000 2>/dev/null | head | wc -l &
sleep 5
killall tcpdump

If no stream is played by mpg123, the result will be 1. Otherwise, it will be > 1.

How can I get this result into a variable? Then I could relaunch mpg123 if the streaming has failed.

Note that I can't use the timeout command and I can't write anything on my system.

Upvotes: 0

Views: 494

Answers (1)

Keef Baker
Keef Baker

Reputation: 641

possibly

isitthere=$(tcpdump -i eth0  port 8000 2>/dev/null | head | wc -l & sleep 5; killall tcpdump)

if [[ $isitthere -eq 1 ]]
then
     SET FIRE TO EVERYTHING
fi

not sure if it'd handle the sleep 5. But can't you use a -ll switch on tcp dump so..

worth a shot.

Upvotes: 1

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