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#!/usr/bin/env python
# Thu, 13 Mar 14 (PDT)
# ip.py: Demonstrate IP objects
# Copyright (C) 2015, Nevil Brownlee, U Auckland | WAND
from plt_testing import *
t = get_example_trace('icmp-sample.pcap')
n = 0
for pkt in t:
n += 1 # Wireshark uses 1-org packet numbers
ip = pkt.ip
if not ip:
continue
print "%03d: checksum=%04x, OK=%s" % (n, ip.checksum, ip.test_l3_cksm())
icmp = ip.icmp
if icmp:
try:
print " icmp checksum=%04x, ok=%s" % (
icmp.checksum, icmp.test_trans_cksm())
if not icmp.test_trans_cksm():
icmp.set_trans_cksm()
else:
icmp.checksum = 0x5678
print " icmp checksum=%04x, ok=%s" % (
icmp.checksum, icmp.test_trans_cksm())
except ValueError, e:
print " .icmp. %s" % e
if n == 10:
break
t.close()
t = get_example_trace('icmp6-sample.pcap')
n = 0
for pkt in t:
n += 1 # Wireshark uses 1-org packet numbers
ip6 = pkt.ip6
if not ip6:
continue
print "%03d: checksum=%04x, OK=%s" % (n, ip.checksum, ip.test_trans_cksm())
icmp6 = ip6.icmp6
if icmp6:
try:
print " icmp6 checksum=%04x, ok=%s" % (
icmp6.checksum, icmp6.test_trans_cksm())
if not icmp6.test_trans_cksm():
icmp6.set_trans_cksm()
else:
icmp6.checksum = 0x9ABC
print " icmp6 checksum=%04x, ok=%s" % (
icmp6.checksum, icmp6.test_trans_cksm())
except ValueError, e:
print " .icmp6. %s" % e
if n == 10:
break
t.close()
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