From: Brian Candler <b.candler@...>
Date: 2009-12-22T19:09:20+09:00
Subject: Re: promiscuous mode

Marco Biscetti wrote:
> Hi guys. i have a question. i am new in a ruby world.
> How can i set my wlan device in a promiscuous mode?

One answer is: use the Socket API. You have direct access there to all 
the facilities there that you would have in a C program, e.g. 
setsockopt.

So the problem boils down to: how do I create a raw socket, how do I set 
promiscuous mode on it, how do I read packets from it? These are socket 
questions, not Ruby ones. If you can find a C program which does what 
you want, you can port it to ruby.

As has already been pointed out, Ruby is probably a poor choice of 
language for packet inspection if you have any significant volume of 
traffic.

But if you really want to do it in Ruby, I suggest you use someone 
else's code: google for "ruby pcap".
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