public void RandomArpTest()
{
Random random = new Random();
for (int i = 0; i != 1000; ++i)
{
MacAddress ethernetSource = random.NextMacAddress();
EthernetLayer ethernetLayer = new EthernetLayer
{
Source = ethernetSource,
};
ArpLayer arpLayer = random.NextArpLayer();
Packet packet = PacketBuilder.Build(DateTime.Now, ethernetLayer, arpLayer);
Assert.IsTrue(packet.IsValid, "IsValid");
// Ethernet
Assert.AreEqual(packet.Length - EthernetDatagram.HeaderLengthValue, packet.Ethernet.PayloadLength, "PayloadLength");
Assert.AreEqual(ethernetSource, packet.Ethernet.Source, "Ethernet Source");
Assert.AreEqual(EthernetDatagram.BroadcastAddress, packet.Ethernet.Destination, "Ethernet Destination");
Assert.AreEqual(EthernetType.Arp, packet.Ethernet.EtherType, "Ethernet EtherType");
// Arp
Assert.AreEqual(ArpDatagram.HeaderBaseLength + 2 * arpLayer.SenderHardwareAddress.Count + 2 * arpLayer.SenderProtocolAddress.Count, packet.Ethernet.Arp.Length, "Arp length");
Assert.AreEqual(ArpHardwareType.Ethernet, packet.Ethernet.Arp.HardwareType, "Arp hardware type");
Assert.AreEqual(arpLayer, packet.Ethernet.Arp.ExtractLayer(), "ARP Layer");
Assert.AreNotEqual(arpLayer, random.NextArpLayer(), "ARP Layer");
Assert.AreEqual(arpLayer.GetHashCode(), packet.Ethernet.Arp.ExtractLayer().GetHashCode(), "ARP Layer");
ArpLayer differentArpLayer = random.NextArpLayer();
Assert.AreNotEqual(arpLayer.GetHashCode(), differentArpLayer.GetHashCode(), "ARP Layer");
}
}
private static void CreateRandomEthernetPayload(Random random, EthernetBaseLayer ethernetBaseLayer, List<ILayer> layers)
{
if (random.NextBool(20))
{
// Finish with payload.
PayloadLayer payloadLayer = random.NextPayloadLayer(random.Next(100));
layers.Add(payloadLayer);
return;
}
ethernetBaseLayer.EtherType = EthernetType.None;
switch (random.NextInt(0, 7))
{
case 0: // VLanTaggedFrame.
case 1:
VLanTaggedFrameLayer vLanTaggedFrameLayer = random.NextVLanTaggedFrameLayer();
layers.Add(vLanTaggedFrameLayer);
CreateRandomEthernetPayload(random, vLanTaggedFrameLayer, layers);
return;
case 2: // ARP.
EthernetLayer ethernetLayer = (ethernetBaseLayer as EthernetLayer);
if (ethernetLayer != null)
ethernetLayer.Destination = MacAddress.Zero;
layers.Add(random.NextArpLayer());
return;
case 3: // IPv4.
case 4:
IpV4Layer ipV4Layer = random.NextIpV4Layer();
layers.Add(ipV4Layer);
CreateRandomIpPayload(random, ipV4Layer, layers);
return;
case 5: // IPv6
case 6:
IpV6Layer ipV6Layer = random.NextIpV6Layer(random.NextBool(20));
layers.Add(ipV6Layer);
CreateRandomIpPayload(random, ipV6Layer, layers);
return;
default:
throw new InvalidOperationException("Invalid value.");
}
}
