Monitor your Browsing and Downloading data via Python

Download-Monitor

So here’s a small script which will monitor the amount of your browsing/downloading data. I have used pypcap and dpkt library. dpkt is a library which provides packets creation/ parsing capabilities with an object oriented interface. The project is hosted at http://code.google.com/p/dpkt/ .

#!/usr/bin/python2.7
import pcap, dpkt, socket

pc = pcap.pcap()
ports = (80, 8080, 443, 888) # for HTPP and HTPPS

pc is now my pcap.pcap object. pcap objects are their own iterator returning the timestamp and the packet as a 2-tuple.

def process():
  mem = sport = dport = 0
  try:
    for ts, pkt in pc:
      eth = dpkt.ethernet.Ethernet(pkt)
      ip = eth.data

now ts contains timestamp and data is stored in pkt eth is an object of class dpkt.ethernet.Ethernet Now accessing ip <class 'dpkt.ip.IP'>, we access the data as ip.data

if ip.__class__ == dpkt.ip.IP:
ip1, ip2 = map(socket.inet_ntoa, [ip.src, ip.dst])
if ip.p == socket.IPPROTO_TCP:
I7 = ip.data
sport, dport = [I7.sport, I7.dport]

We use socket.inet_ntoa mapping to get the source IP address and Destination IP address. ip.data contains all the required data information that we need.

          if sport in ports or dport in ports:
            if len(I7.data) > 0:
              print 'From %s to %s, length: %d' %(ip1, ip2, len(I7.data))
              mem = mem + len(I7.data)
    except KeyboardInterrupt:
      return int(mem)

len(I7.data) is the amount of data(in bytes) that package (pkt) contains. And to wrap it up,

def main():
  mem = process()
  print float(mem/(1024*1024)), 'mb'
  return

if __name__ == '__main__':
  main()

I hope you find this code helpful. Suggestions are welcome.

So, A day well spent. Learned a bit about networking, ports, pypcap, dpkt! P.S. Python seems fun!

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