Python_sniffer

This simple python class provides a network sniffer. It uses the scapy libraries.

Description

The scapy's method "sniff" has the characteristic that it locks the execution of the code. With this class you can run the sniffer in a new thread without locking the natural execution of the code.

Usage

from Sniffer import Sniffer
from Iface import Iface

iface = Iface('wlan0')

# This is an optional command
iface.set_mtu(2500)

sniffer = Sniffer(iface)
sniffer.start()
# Some instruction
sniffer.stop()

The constructor accepts also callback functions then you can use the scapy methods on sniffed packet:

def print_packet(*args, **kwargs):
  print("This message is printed every time that sniffer intercepts a packet.")
  print(kwargs)
  args[0].show()

def finished(*args, **kwargs):
  print("This message is printed when you stop the sniffer.")

iface = Iface('wlan0')
prn_kwargs = {'var': 0}
sniffer = Sniffer(iface, callback_prn=print_packet, callback_stop=finished, callback_prn_kwargs=prn_kwargs)
sniffer.start()
while(sniffer.get_started_flag() is False):
    pass
# Some instruction
sniffer.stop()

Prerequisites

This class is written with Python3. Then you need to install scapy in python3 enviroment and run script with sudo command.

Other

You can have only one instance of sniffer. At now, if you call .stop method you have to create another instance of sniffer if you want re-run it.

iface = Iface('wlan0')
sniffer = Sniffer(iface)
sniffer.start()
sniffer.stop()
sniffer = Sniffer(iface)
sniffer.start()