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pcap.py
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pcap.py
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import sys
import argparse
import pyshark
import numpy as np
import matplotlib.pyplot as plt
from netaddr import IPNetwork, IPAddress, IPSet
npkts=0
npkts_up=0
npkts_down=0
len_up=0
len_down=0
t0=0
t=0
dic ={}
inter_interval_down=[]
inter_interval_up=[]
def pkt_callback(pkt):
global scnets
global ssnets
global npkts
global npkts_up
global npkts_down
global len_up
global len_down
global t
global t0
global dic
global lastupload
global lastdownload
global inter_interval_down
global inter_interval_up
if IPAddress(pkt.ip.src) in scnets|ssnets and IPAddress(pkt.ip.dst) in scnets|ssnets:
t = float(pkt.sniff_timestamp)
delta = 1
global k
k= int((t- t0)/delta)
stat_line =[0,0,0,0]
if npkts == 0:
t0=t
lastupload = pkt
lastdownload = pkt
if IPAddress(pkt.ip.src) in scnets and IPAddress(pkt.ip.dst): #upload
if lastupload != None:
inter_interval_up.append(t- float(lastupload.sniff_timestamp))
if k in dic:
stat_line = dic[k]
stat_line[0]= stat_line[0]+ int(pkt.ip.len)
stat_line[1]=stat_line[1]+1
else:
stat_line = [int(pkt.ip.len),1,0,0]
dic.update({k:stat_line})
lastupload = pkt
if IPAddress(pkt.ip.src) in ssnets: #download
if lastupload != None:
inter_interval_down.append(t- float(lastdownload.sniff_timestamp))
if dic.has_key(k):
stat_line = dic[k]
stat_line[2]=stat_line[3]+int(pkt.ip.len)
stat_line[3]=stat_line[3]+1
else:
stat_line = [0,0,int(pkt.ip.len),1]
dic.update({k:stat_line})
lastdownload = pkt
npkts=npkts+1
#print (str(dic))
#if pkt.ip.proto=='17':
#print('%s: IP packet from %s to %s (UDP:%s) %s'%(pkt.sniff_timestamp,pkt.ip.src,pkt.ip.dst,pkt.udp.dstport,pkt.ip.len))
#elif pkt.ip.proto=='6':
#print('%s: IP packet from %s to %s (TCP:%s) %s'%(pkt.sniff_timestamp,pkt.ip.src,pkt.ip.dst,pkt.tcp.dstport,pkt.ip.len))
#else:
#print('%s: IP packet from %s to %s (other) %s'%(pkt.sniff_timestamp, pkt.ip.src,pkt.ip.dst,pkt.ip.len))
def main():
k = 0
parser=argparse.ArgumentParser()
parser.add_argument('-i', '--interface', nargs='?',required=True, help='capture interface')
parser.add_argument('-c', '--cnet', nargs='+',required=True, help='client network(s)')
parser.add_argument('-s', '--snet', nargs='+',required=True, help='service network(s)')
parser.add_argument('-t', '--tcpport', nargs='?',help='service TCP port (or range)')
parser.add_argument('-u', '--udpport', nargs='?',help='service UDP port (or range)')
args=parser.parse_args()
cnets=[]
for n in args.cnet:
try:
nn=IPNetwork(n)
cnets.append(nn)
except:
print('%s is not a network prefix'%n)
print(cnets)
if len(cnets)==0:
print("No valid client network prefixes.")
sys.exit()
global scnets
scnets=IPSet(cnets)
snets=[]
for n in args.snet:
try:
print n
nn=IPNetwork(n)
snets.append(nn)
except:
print('%s is not a network prefix'%n)
print(snets)
if len(snets)==0:
print("No valid service network prefixes.")
sys.exit()
global ssnets
ssnets=IPSet(snets)
if args.udpport is not None:
cfilter='udp portrange '+args.udpport
elif args.tcpport is not None:
cfilter='tcp portrange '+args.tcpport
else:
cfilter='ip'
cint=args.interface
print('Filter: %s on %s'%(cfilter,cint))
try:
capture = pyshark.LiveCapture(interface=cint,bpf_filter=cfilter)
capture.apply_on_packets(pkt_callback)
print(inter_interval_down)
print(inter_interval_up)
except KeyboardInterrupt:
global npkts
global npkts_up
global npkts_down
global len_up
global len_down
global t0
keys = []
values = []
file_ = open('stats', 'w')
#file_.write('npkts:'+str(npkts)+'\n')
#file_.write('npkts_down:'+ str(npkts_down)+'\n')
#file_.write('npkts_up:'+ str(npkts_up)+'\n')
file_.write(str(dic))
file_.close()
file_ = open('down', 'w')
for key,value in dic.items():
keys.append(key)
values.append(value)
for key in keys:
file_.write(str(dic.get(key)[1]) + "\n")
v = list(zip(*values))
plt.plot(v[0], marker='o', color='r', ls='')
plt.show()
print('\n%d packets captured! Done!\n'%npkts)
if __name__ == '__main__':
main()