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# Copyright (c) 2005, Neville-Neil Consulting
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# Neither the name of Neville-Neil Consulting nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# File: $Id: dnstest.py,v 1.1 2006/09/01 05:24:04 gnn Exp $
#
# Author: George V. Neville-Neil
#
# Description: This module performs a self test on the DNS packet.
# That is to say it first encodes a packet, then decodes is and makes
# sure that the data matches.
import unittest
import sys
#sys.path.insert(0, "..") # Look locally first.
from pcs.packets.dns import *
from pcs.packets.ipv4 import ipv4
class dnsTestCase(unittest.TestCase):
def test_dns(self):
# create one packet, copy its bytes, then compare their fields
dns = dnsheader()
assert (dns != None)
dns.id = 1
dns.query = 0
dns.opcode = 0
dns.aa = 0
dns.tc = 0
dns.rd = 1
dns.ra = 0
dns.z = 0
dns.rcode = 0
dns.qdcount = 1
dns.ancount = 0
dns.nscount = 0
dns.arcount = 0
# Create a packet to compare against
dnsnew = dnsheader()
dnsnew.decode(dns.bytes)
self.assertEqual(dns.bytes, dnsnew.bytes, "bytes not equal")
self.assertEqual(dns.id, dnsnew.id, "id not equal")
self.assertEqual(dns.query, dnsnew.query, "query not equal")
self.assertEqual(dns.opcode, dnsnew.opcode, "opcode not equal")
self.assertEqual(dns.aa, dnsnew.aa, "aa not equal")
self.assertEqual(dns.tc, dnsnew.tc, "tc not equal")
self.assertEqual(dns.rd, dnsnew.rd, "rd not equal")
self.assertEqual(dns.ra, dnsnew.ra, "ra not equal")
self.assertEqual(dns.z, dnsnew.z, "z not equal")
self.assertEqual(dns.rcode, dnsnew.rcode, "rcode not equal")
self.assertEqual(dns.qdcount, dnsnew.qdcount, "qdcount not equal")
self.assertEqual(dns.ancount, dnsnew.ancount, "ancount not equal")
self.assertEqual(dns.nscount, dnsnew.nscount, "nscount not equal")
self.assertEqual(dns.arcount, dnsnew.arcount, "arcount not equal")
dns = dnsquery()
dns.name = "neville-neil.com"
dns.type = 1
dns.query_class = 1
dnsnew = dnsquery()
dnsnew.decode(dns.bytes)
self.assertEqual(dns.name, dnsnew.name, "name not equal")
self.assertEqual(dns.type, dnsnew.type, "type not equal")
self.assertEqual(dns.query_class, dnsnew.query_class, "class not equal")
dns = dnsrr()
dns.name = "neville-neil.com"
dns.type = 1
dns.query_class = 1
dns.ttl = 32
dns.rdata = "ns.meer.net"
dnsnew = dnsrr()
dnsnew.decode(dns.bytes)
self.assertEqual(dns.name, dnsnew.name, "name not equal")
self.assertEqual(dns.type, dnsnew.type, "type not equal")
self.assertEqual(dns.query_class, dnsnew.query_class, "class not equal")
self.assertEqual(dns.ttl, dnsnew.ttl, "ttl not equal")
self.assertEqual(dns.rdata, dnsnew.rdata, "rdata not equal")
def test_dns_read(self):
"""This test reads from a pre-stored pcap file generated with tcpdump and ping on the loopback interface."""
import pcs.pcap as pcap
file = pcap.pcap("dns.out")
packet = file.next()[1]
ip = ipv4(packet[file.dloff:len(packet)])
assert (ip != None)
print ip
print ip.data
udp = ip.data
print udp
dns = udp.data
print dns
def test_udpv4_compare(self):
"""Test the underlying __compare__ functionality of the
packet. Two packets constructed from the same bytes should be
equal and two that are not should not be equal."""
import pcs.pcap as pcap
file = pcap.pcap("loopping.out")
packet = file.next()[1]
udp1 = udpv4(packet[file.dloff:len(packet)])
udp2 = udpv4(packet[file.dloff:len(packet)])
assert (udp1 != None)
assert (udp2 != None)
self.assertEqual(udp1, udp2, "packets should be equal but are not")
udp1.dst = 0xffffffff
self.assertNotEqual(udp1, udp2, "packets compare equal but should not")
def test_udpv4_print(self):
"""This test reads from a pre-stored pcap file generated with
tcpdump and ping on the loopback interface and tests the
__str__ method to make sure the correct values are printed."""
import pcs.pcap as pcap
file = pcap.pcap("loopping.out")
packet = file.next()[1]
udp = udpv4(packet[file.dloff:len(packet)])
assert (udp != None)
test_string = "version 4\nhlen 5\ntos 0\nlength 84\nid 59067\nflags 0\noffset 0\nttl 64\nprotocol 1\nchecksum 0\nsrc 2130706433\ndst 2130706433\n"
string = udp.__str__()
self.assertEqual(string, test_string,
"strings are not equal \nexpected %s \ngot %s " %
(test_string, string))
if __name__ == '__main__':
unittest.main()
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