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# File: $Id: chaintest.py,v 1.3 2006/06/27 14:45:43 gnn Exp $
#
# Author: George V. Neville-Neil
#
# Description: A test of the Chain class in PCS.

import unittest

import sys
#sys.path.insert(0, '../')

from pcs.packets.ethernet import ethernet
from pcs.packets.ipv4 import ipv4
from pcs import *

class chainTestCase(unittest.TestCase):
    def test_chain_compare(self):
        """Test the underlying __eq__ 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]
        ip1 = ipv4(packet[file.dloff:len(packet)])
        ip2 = ipv4(packet[file.dloff:len(packet)])
        assert (ip1 != None)
        assert (ip2 != None)

        ether1 = ethernet()
        ether1.src = "\x00\x00\x00\x00\x00\x01"
        ether1.dst = "\x00\x00\x00\x00\x00\x02"

        ether2 = ethernet()
        ether2.src = "\x00\x00\x00\x00\x00\x01"
        ether2.dst = "\x00\x00\x00\x00\x00\x02"

        chain1 = Chain([ether1, ip1])
        chain2 = Chain([ether2, ip2])
        
        self.assertEqual(chain1, chain2, "chains should be equal but are not")

        ip1.dst = 0
        self.assertNotEqual(chain1, chain2, "chains compare equal but should not")

    def test_chain_read(self):
        """Test whether or not the chain method of the base class works."""
        file = PcapConnector("loopping.out")
        packet = file.readpkt()
        chain = packet.chain()
        test_string = "Localhost\ntype 2\n IPv4\nversion 4\nhlen 5\ntos 0\nlength 84\nid 59067\nflags 0\noffset 0\nttl 64\nprotocol 1\nchecksum 0\nsrc 127.0.0.1\ndst 127.0.0.1\n ICMPv4\ntype 8\ncode 0\nchecksum 60550"

        string = chain.__str__()
        self.assertEqual(test_string, string,
                    "strings not equal \ngot\n%s\nexpected\n%s" %
                    (string, test_string))
        
if __name__ == '__main__':
    unittest.main()