docker-gnuradio-gr-gsm-ptrkrysik

This is a repo with the sources from https://github.com/ptrkrysik/gr-gsm in a docker to easily decode GSM with a rtlsdr dongle.

HOWTO

Start the image with extra privileges to access the rtlsdr dongle and expose a ssh-port:

 $ docker run -ti --privileged -p 2224:22 marcelmaatkamp/gnuradio-gr-gsm-ptrkrys:latest
 
 root@gnuradio-gr-gsm-ptrkrys# /usr/sbin/sshd

Then add your ssh pubkey into /root/.ssh/authorized_keys2

In another terminal ssh into the box with X-forwarding enabled:

  $ ssh -X -p 2224 root@dockerhost
  
  root@gnuradio-gr-gsm-ptrkrys# locale-gen en_US en_US.UTF-8
  root@gnuradio-gr-gsm-ptrkrys# export LC_ALL="en_US.UTF-8"
  root@gnuradio-gr-gsm-ptrkrys# airprobe_rtlsdr.py

If you tune it right the terminal will display a flood of GSM messages:

I made a nogui version which will output the gsm stream:

 root@gnuradio-gr-gsm-ptrkrys# # airprobe_rtlsdr_nogui.py -p 55 -g 48 -f 9.462e+08

You can now open Wireshark and inspect the GSM messages on port 4729/udp