Monday, 1 April 2013

Wi-Fi SSID Sniffer in 11 Lines of Python using Raw Sockets

I covered writing a Wi-Fi SSID Sniffer using Scapy in just 10 lines in a previous post.  Interestingly, a lot of people (mostly developers) want to know how your code would look like if you did not use scapy?

Here was the old scapy version I posted today:

Here is a raw socket version of the same code :)

The above jumps over the Radiotap header, get the MAC address in address field 2 and then gets the first Tagged TLV (typically the SSID) from the Beacon header. This is definitely not the most production ready code :) and needs a lot of work (need to iterate through TLVs in case SSID is not the first one etc. ) but seems to work quite well -- below is a sample output.

I'll probably do a more detailed writeup explaining the code later in the week with some more checks to make it reliable. I think its still possible to accomplish writing a SSID sniffer in under 25 lines with no 3rd party libs being used. We'll see - Good Night! :)

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