#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright (C) 2023 Fortra. All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
import unittest
from impacket.dot11 import ProtocolPacket


class PacketTest(ProtocolPacket):

    def __init__(self, aBuffer=None):
        header_size = 7
        tail_size = 5
        
        ProtocolPacket.__init__(self, header_size, tail_size)
        if aBuffer:
            self.load_packet(aBuffer)


class TestDot11HierarchicalUpdate(unittest.TestCase):

    def setUp(self):
        self.rawpacket1 = b"" \
            b"Header1"\
            b"Body1"\
            b"Tail1"

        self.rawpacket2 = b"" \
            b"Header2"+\
            self.rawpacket1+ \
            b"Tail2"

        self.rawpacket3 = b"" \
            b"Header3"+\
            self.rawpacket2+ \
            b"Tail3"

        self.packet1 = PacketTest(self.rawpacket1)
        self.packet2 = PacketTest(self.rawpacket2)
        self.packet2.contains(self.packet1)
        self.packet3 = PacketTest(self.rawpacket3)
        self.packet3.contains(self.packet2)
        
    def test_01_StartupPacketsStringTest(self):
        "ProtocolPacket - get_packet initial string test"
        self.assertEqual(self.packet1.get_packet(), b"Header1Body1Tail1")
        self.assertEqual(self.packet2.get_packet(), b"Header2Header1Body1Tail1Tail2")
        self.assertEqual(self.packet3.get_packet(), b"Header3Header2Header1Body1Tail1Tail2Tail3")

    def test_02_StartupPacketsSizeTest(self):
        "ProtocolPacket - Initial size getters test"
        
        self.assertEqual(self.packet1.get_size(), 7+5+5)        
        self.assertEqual(self.packet1.get_header_size(), 7)
        self.assertEqual(self.packet1.get_body_size(), 5)
        self.assertEqual(self.packet1.get_tail_size(), 5)
        
        self.assertEqual(self.packet2.get_size(), 7+ (7+5+5) + 5)
        self.assertEqual(self.packet2.get_header_size(), 7)
        self.assertEqual(self.packet2.get_body_size(), 7+5+5)
        self.assertEqual(self.packet2.get_tail_size(), 5)
        
        self.assertEqual(self.packet3.get_size(), 7+ (7+ (7+5+5) +5) +5 )
        self.assertEqual(self.packet3.get_header_size(), 7)
        self.assertEqual(self.packet3.get_body_size(), 7+ 7+5+5 +5)
        self.assertEqual(self.packet3.get_tail_size(), 5)
    
    def test_03_ChildModificationTest(self):
        "ProtocolPacket - get_packet hierarchical update test"
        self.packet1.load_body(b"**NewBody**")
        self.assertEqual(self.packet1.get_packet(), b"Header1**NewBody**Tail1")
        self.assertEqual(self.packet2.get_packet(), b"Header2Header1**NewBody**Tail1Tail2")
        self.assertEqual(self.packet3.get_packet(), b"Header3Header2Header1**NewBody**Tail1Tail2Tail3")
        
    def test_04_ChildModificationTest(self):
        "ProtocolPacket - size getters hierarchical update test"
        self.packet1.load_body(b"**NewBody**")
        #self.packet1 => "Header1**NewBody**Tail1"
        #self.packet2 => "Header2Header1**NewBody**Tail1Tail2"
        #self.packet3 => "Header3Header2Header1**NewBody**Tail1Tail2Tail3"        
        
        self.assertEqual(self.packet1.get_size(), 7+11+5 )
        self.assertEqual(self.packet1.get_header_size(), 7)
        self.assertEqual(self.packet1.get_body_size(), 11)
        self.assertEqual(self.packet1.get_tail_size(), 5)
        
        self.assertEqual(self.packet2.get_size(), 7+ (7+11+5) +5 )        
        self.assertEqual(self.packet2.get_header_size(), 7)
        self.assertEqual(self.packet2.get_body_size(), 7+11+5)
        self.assertEqual(self.packet2.get_tail_size(), 5)
        
        self.assertEqual(self.packet3.get_size(), 7+ (7+ (7+11+5) +5) +5 )        
        self.assertEqual(self.packet3.get_header_size(), 7)
        self.assertEqual(self.packet3.get_body_size(), 7+ (7+11+5) +5)
        self.assertEqual(self.packet3.get_tail_size(), 5)

    def test_05_ChildModificationTest(self):
        "ProtocolPacket - body packet hierarchical update test"
        self.packet1.load_body(b"**NewBody**")
        self.assertEqual(self.packet1.body.get_buffer_as_string(), b"**NewBody**")
        self.assertEqual(self.packet2.body.get_buffer_as_string(), b"Header1**NewBody**Tail1")
        self.assertEqual(self.packet3.body.get_buffer_as_string(), b"Header2Header1**NewBody**Tail1Tail2")

    def test_06_ChildModificationTest(self):
        "ProtocolPacket - get_body_as_string packet hierarchical update test"
        self.packet1.load_body(b"**NewBody**")
        self.assertEqual(self.packet1.get_body_as_string(), b"**NewBody**")
        self.assertEqual(self.packet2.get_body_as_string(), b"Header1**NewBody**Tail1")
        self.assertEqual(self.packet3.get_body_as_string(), b"Header2Header1**NewBody**Tail1Tail2")

    def test_07_ChildModificationTest(self):
        "ProtocolPacket - load_body child hierarchy update test"
        self.assertEqual(self.packet1.parent(), self.packet2)
        self.assertEqual(self.packet2.parent(), self.packet3)
        
        self.assertEqual(self.packet3.child(), self.packet2)
        self.assertEqual(self.packet2.child(), self.packet1)
        
        self.packet2.load_body(b"Header1**NewBody**Tail1")

        self.assertEqual(self.packet1.parent(), None)
        self.assertEqual(self.packet2.parent(), self.packet3)
        
        self.assertEqual(self.packet3.child(), self.packet2)
        self.assertEqual(self.packet2.child(), None)
    
        self.assertEqual(self.packet1.body.get_buffer_as_string(), b"Body1")
        self.assertEqual(self.packet2.body.get_buffer_as_string(), b"Header1**NewBody**Tail1")
        self.assertEqual(self.packet3.body.get_buffer_as_string(), b"Header2Header1**NewBody**Tail1Tail2")


if __name__ == '__main__':
    unittest.main(verbosity=1)