File: dnstest.py

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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()