pcapy

import pcapy
from impacket.ImpactDecoder import *

# list all the network devices
pcapy.findalldevs()

max_bytes = 16384
promiscuous = False

read_timeout = 100 # in milliseconds
pc = pcapy.open_live("any", max_bytes,
    promiscuous, read_timeout)

pc.setfilter('tcp')

# callback for received packets
out_file = open('output.txt', 'w')
def recv_pkts(hdr, data):
    #try:
        packet = EthDecoder().decode(data)
        #print packet
        out_file.write(str(packet))
    #except:
     #   pass

packet_limit = 1000 # infinite
pc.loop(packet_limit, recv_pkts) # capture packets