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#!/usr/bin/env python
# Sat, 15 Mar 14 (PDT)
# change-filter.py: Create packet filter, change it after seeing a few packets
# Copyright (C) 2015, Nevil Brownlee, U Auckland | WAND
from plt_testing import *
try:
t = plt.trace('anon-v4.pcap')
filter = plt.filter('udp port 53') # Only want DNS packets
t.conf_filter(filter)
t.conf_snaplen(128)
# t.conf_promisc(true)
# Remember: on a live interface, must sudo to capture
# on a trace file, can't set promicuous
except:
print "Failed to configure something!"
exit()
print "starting ..."
t.start()
ntcp = nfp = 0; offset = 12
for pkt in t:
nfp += 1
trans = pkt.transport
if trans:
udp = pkt.udp; tcp = pkt.tcp
print "%3d udp=%s, tcp=%s" % (nfp, udp, tcp)
if udp: # We filtered on UDP first
print_udp(udp, 12)
print_data("UDP:", offset, udp.data, 64)
upl = udp.payload
print_data("udp.payload:", offset, upl.data, 64)
upl = pkt.udp.udp_payload
print_data("udp.udp_pyld:", offset, upl.data, 64)
upl = pkt.udp_payload
print_data("udp_payload:", offset, upl.data, 64)
if nfp == 4:
filter = plt.filter('tcp') # Now only want TCP packets
t.pause
t.conf_filter(filter)
t.start
elif tcp: # Then we changed our filter to TCP
tpl = tcp.payload
if not tpl:
continue
print_tcp(tcp, 12)
print_data("TCP:", offset, tcp.data, 64)
print_data("tcp.payload:", offset, tpl.data, 64)
tpl = pkt.tcp.tcp_payload
print_data("tcp.tcp_pyld:", offset, tpl.data, 64)
tpl = pkt.tcp_payload
print_data("tcp_payload:", offset, tpl.data, 64)
ntcp += 1
if ntcp == 2:
exit()
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