Is there any way I could do this...

trist007 · 01-30-2009, 03:49 PM

I would like to be able to modify the tcpdump binary and add one small option.

I would like to be able to run a command once the activity stops for more than 5 secs.

For example, I'm transfering a file on a specific port, I want tcpdump to monitor the file transfer activity but once it stops, I would like the option to run a command or play a sound so that I know my download is complete. I know I could use firefox or a browser, but I've been experimenting with netcat and would like to learn more about tcp/ip. So I'm transfering files on netcat, monitoring the activity on the command

sudo tcpdump -i ath0 dst port 6666

So I see all the packets been sent, but I would like to know when the download is complete(since netcat doesn't give any notice when the file has been fully downloaded) by letting me play a sound or basically running a command once there is more than 5 secs of inactivity on tcpdump -i ath0 dst port 6666

How would I go about doing this? I'm not an experienced programmer but I love learning and exploring. Thanks.

unSpawn · 01-31-2009, 05:01 AM

How about using 'pv' as in 'nc IP_address port | pv -b > /some/file' instead?

wje_lq · 01-31-2009, 05:48 AM

In capitalism, man exploits man. In Communism, it's the other way around:

Code:

nc IP_address port | pv -b > /some/file

No, it would be more like:

Code:

pv -b 2> /some/file | nc IP_address port

See the pv man page for more information.

trist007 · 01-31-2009, 11:54 AM

Dood that's awesome, thanks guys.