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
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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