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Automating BitTorrent traffic detection via bash

 
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Old 06-09-2018
Hammer & Screwdriver Automating BitTorrent traffic detection via bash
Hi all,

Earlier today, I read an article on how to detect BitTorrent traffic using tshark (the cli version of Wireshark).

I wanted to have a go at creating a simple script, that when BitTorrent packets are detected the network connection will be throttled. The thing is that I am not great at bash scripting and would like some assistance with my script (see below).
Code:
#!/bin/bash
# Sample network stream for 10 seconds and filter for uTP and/or BitTorrent traffic that does not originate on port 80 (HTTP), 443 (HTTPS), 22 (SSH)
TSOUTPUT=$(sudo tshark -a "duration:10" -Y 'udp[8:5] == "\x64\x32\x3A\x69\x70" or bittorrent' -f 'not port 80 and not port 22 and not port 443')

# Get the output of running the tshark command
if [[ $TSOUTPUT != "0 packets captured" ]] then
	# BitTorrent detected - slow down upload/download speed to 0.5 Mbps
	wondershaper eth0 512 512
else
	# Not BitTorrent detected - reset any previously throttled speeds back to full speed
	wondershaper clear eth0
fi

The bash script should be designed to run in cron every minute or two.

I really would appreciate any help with this.
 
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LEARN ABOUT DEBIAN

transmission-remote-cli

transmission-remote-cli(1)				      transmission-remote-cli					transmission-remote-cli(1)

NAME

       transmission-remote-cli - a console client for the Transmission BitTorrent client

SYNOPSIS

       transmission-remote-cli [options] [filename-or-URL]

DESCRIPTION

       transmission-remote-cli is a curses interface for the daemon of the BitTorrent client Transmission.

OPTIONS

       --version
	      Show version number and exit

       -h --help
	      Show usage information and a list of options

       -c CONNECTION --connect=CONNECTION
	      Point to the server. CONNECTION must match the following pattern:
	      [username:password@]host[:port][path]
	      Default: localhost:9091

       -s --ssl
	      Use SSL to connect to the server.
	      Default: don't use SSL

       --create-config
	      Create configuration file with default values.
	      NOTE:  A	config	file won't be created unless you provide this option at least once. After that, it is rewritten whenever transmis-
	      sion-remote-cli exits.

       -f CONFIGFILE --config=CONFIGFILE
	      Set path to configuration file.
	      Default: ~/.config/transmission-remote-cli/settings.cfg

       -n --netrc
	      Get authentication info from ~/.netrc.

       -- OPTIONS
	      Use the known server connection to pass OPTIONS on to transmission-remote.

FILES

       transmission-remote-cli overwrites the configuration file on exit. Keep that in mind if you edit it manually.

SEE ALSO

       transmission-create(1),	transmission-daemon(1),  transmission-edit(1),	transmission-gtk(1),  transmission-qt(1),  transmission-remote(1),
       transmission-show(1).

								  April 22, 2012					transmission-remote-cli(1)