cbrext

Compressed Beamforming Extractor

Overview

This tool extracts the Compressed Beamforming Report data from a PCAP file and saves it to a JSON or CSV file.

Dependencies

python >= 3.9
wireshark >= 4.4.0

Usage

cbrext test/pcaps/beamforming.pcap -W test_out.json

Options

-h,  --help                     Show this help message and exit

-d,  --dir                      Extract all PCAP files in a directory
-W,  --write    <file or dir>   Write the extracted data to a file

-sa, --src-addr <wlan.sa>       Filter by source address
-su, --single-user              Extract SU
-mu, --multi-user               Extract MU

-j,  --json                     Write the extracted data to a JSON file (default)
-c,  --csv                      Write the extracted data to a CSV file  # in progress
-p,  --pcap                     Write the extracted data to a PCAP file # in progress
-b,  --binary                   Decode the CBR hex to binary

-i,  --info                     Print the CBR info
-l,  --length                   Setting the length of the CBR data

-v,  --verbose                  Print verbose output

Examples

Directory Option: -d

cbrext -d tests/pcaps/ -W test_out.json

shell out:

$ cbrext -d tests/pcaps/ -W test_out.json
Processing tests/pcaps/ and generating output...
[ 1/2 ] filtered_4F_0.pcap -> CBR Length: 7900612
[ 2/2 ] filtered_4F_m0.pcap -> CBR Length: 12088706
PCAP Count: 2
Total CBR Length: 19989318

json out:

[
    [
        "75:2e:a9:68 ...",
        "75:2f:69:68 ...",
        ...
    ],
    [
        "69:70:77:f5 ...",
        "69:70:77:f5 ...",
        ...
    ]
]

Binary Option: -b

cbrext tests/pcaps/filtered_4F_0.pcap -W test_out.json -i -l 2639

shell out:

$ cbrext tests/pcaps/filtered_4F_0.pcap -W test_out.json -i -l 2639
Processing tests/pcaps/filtered_4F_0.pcap and generating output...
Total CBR Length: 7900612
{'2639_2_3_2': {'nc': '2', 'nr': '3', 'min_antenna': '2', 'count': 126}, '2651_2_3_2': {'nc': '2', 'nr': '3', 'min_antenna': '2', 'count': 2153}}

Length Option: -l

cbrext tests/pcaps/filtered_4F_0.pcap -W test_out.json -i -l 2639

json out:

Note: It is recommended to determine and set an appropriate value to limit the length information of CBRs after analyzing it with the -i option. Currently, Wireshark has a bug where the CBR length is recognized as 4 bytes longer in portion of packets. Therefore, you can use the -l option to extract only the desired length and the -i option to check the number of antennas.

[
    "75:2e:a9:68 ...",
    "75:2f:69:68 ...",
    ...
]

Development

Installation

python -m pip install .

Updating

python -m pip install --upgrade .

Testing

python -m unittest discover -s tests

Uninstalling

python -m pip uninstall cbrext

Citation

Meneghello, Francesca, Rossi, Michele, and Restuccia, Francesco. "DeepCSI: Rethinking Wi-Fi Radio Fingerprinting Through MU-MIMO CSI Feedback Deep Learning." In IEEE International Conference on Distributed Computing Systems, 2022.

See: https://github.com/francescamen/DeepCSI for more details.