import dpkt, pcap
from statlib import stats


from socket import inet_ntop, AF_INET
from optparse import OptionParser


parser = OptionParser() 
parser.add_option("-f", "--file", action="store", type="string", dest="filename")

(options, args) = parser.parse_args()
pc = pcap.pcap(options.filename)

frame = 0
cPktTs = 0
pPktTs = 0
timeDelta = []
pktLengths = []

for ts,data in pc:
   eth = dpkt.ethernet.Ethernet(data)
   pktFlags = eth.ip.tcp.flags
   pktSrcIP = inet_ntop(AF_INET,eth.ip.src)
   pktDstIP = inet_ntop(AF_INET,eth.ip.dst)
   pktSrcPort = eth.ip.tcp.sport
   pktDstPort = eth.ip.tcp.dport
   pktLen = eth.ip.len
   
   frame = frame + 1
   pPktTs = cPktTs
   cPktTs = ts
   cpDeltaTime = cPktTs - pPktTs
   
   if frame > 1:
      timeDelta.append(cpDeltaTime)
      pktLengths.append(pktLen)

print "DATA,MIN,MAX,MEAN,SDEV"
print "Time,%f,%f,%f,%f" %(min(timeDelta),max(timeDelta),stats.mean(timeDelta),stats.stdev(timeDelta))
print "PktLength,%d,%d,%d,%f" %(min(pktLengths),max(pktLengths),stats.mean(pktLengths),stats.stdev(pktLengths))