Hacking_and_Penetration_Testing_with_Low_Power_Devices

144 CHAPTER 6 Input and output devices
The only change is to use the env command execute Python instead of invoking a
script.
The line “from scapy.all import *” is used to load all the goodies from the Scapy
networking module. Next, an empty list to store detected access points is created
before any methods are defined in order to make this variable globally accessible.
A handler function called packet_handler is then defined.
The line “sniff(iface¼"mon0", prn¼packet_handler, timeout¼60)” in the main
method performs a packet capture on the mon0 interface for 60 seconds. The handler
function, packet_handler, is called for each received packet. The if statement “if
__name__ ¼¼ ’__main__’ :” demonstrates a Python trick that allows you to write
code that can be imported into other Python scripts (as we have done with the Scapy
module) or to run the script directly. Note that double underscores are used before
and after name and main.
The results of running this script are shown in Figure 6.12. From the screenshot,
we can see that our target PFE-Secure network is running on channel 6. The PFE-
Guest and another uninteresting network are also detected. If you run this script
and it does not work for you, you most likely forgot to run the airmon-ng start
wlan0 mentioned earlier (assuming your wireless adapter is wlan0). Recall that
you can list all of the network interfaces on your machine by executing the command
ifconfig -a.
FIGURE 6.12
Detecting wireless networks with Scapy.