public void GreIPv4Parsing()
{
var dev = new CaptureFileReaderDevice(NUnitSetupClass.CaptureDirectory + "gre_all_options.pcap");
dev.Open();
var rawCapture = dev.GetNextPacket();
dev.Close();
LinkLayers linkLayers = rawCapture.GetLinkLayers();
if (linkLayers == LinkLayers.Ethernet)
{
Console.WriteLine("Linklayer is ethernet");
// Linklayer
Packet p = Packet.ParsePacket(linkLayers, rawCapture.Data);
Assert.IsNotNull(p);
// Ethernet
EthernetPacket eth = p.Extract <EthernetPacket>();
Assert.IsNotNull(eth);
if (eth.Type == EthernetType.IPv4)
{
Console.WriteLine("IPv4 inside ethernet");
// IPv4
IPv4Packet ipv4 = eth.Extract <IPv4Packet>();
Assert.IsNotNull(ipv4);
if (ipv4.Protocol == ProtocolType.Gre)
{
Console.WriteLine("GRE inside IPv4");
// Gre
GrePacket grep = ipv4.Extract <GrePacket>();
Assert.IsNotNull(grep);
// String output
Console.WriteLine(grep.ToString());
// Get header
if (grep.HasCheckSum)
{
Console.WriteLine("GRE has checksum flag");
}
if (grep.HasKey)
{
Console.WriteLine("GRE has key flag");
}
if (grep.HasReserved)
{
Console.WriteLine("GRE has reserved flag");
}
if (grep.HasSequence)
{
Console.WriteLine("GRE has sequence flag");
}
Assert.AreEqual(grep.Protocol, EthernetType.IPv4);
}
}
}
}
/// <summary>
/// BEAWARE Runns in parallel
/// </summary>
/// <param name="pmFrame"></param>
/// <param name="parentPacket"></param>
/// <returns></returns>
public async Task CreateAndAddToMetaFramesVirtualFrame(PmFrameBase pmFrame, PmPacket parentPacket)
{
PmFrameVirtual virtualFrame = null;
switch (pmFrame.IpProtocol)
{
case IPProtocolType.GRE:
var gre = new GrePacket(new ByteArraySegment(pmFrame.L4Data()));
virtualFrame = new PmFrameVirtual(pmFrame.PmCapture, pmFrame.FrameIndex, pmFrame.TimeStamp, pmFrame.IncludedLength, (pmFrame.L4Offset + gre.Header.Length));
break;
case IPProtocolType.IPV6:
virtualFrame = new PmFrameVirtual(pmFrame.PmCapture, pmFrame.FrameIndex, pmFrame.TimeStamp, pmFrame.IncludedLength, (pmFrame.L4Offset));
break;
case IPProtocolType.UDP:
var udp = new UdpPacket(new ByteArraySegment(pmFrame.L4Data()));
//Port 3544 is used to communicate with Teredo Server. We need communication between host and Teredo Relay (temporarily solution)
if (udp.DestinationPort == 3544 || udp.SourcePort == 3544)
{
break;
}
virtualFrame = new PmFrameVirtual(pmFrame.PmCapture, pmFrame.FrameIndex, pmFrame.TimeStamp, pmFrame.IncludedLength,
(pmFrame.L4Offset + udp.Header.Length));
break;
}
if (virtualFrame != null)
{
await this.PmMetaFramesBufferBlock.SendAsync(virtualFrame);
}
}