//Captures packets while issuing concurrent calls to update the GUI
/// <summary>
/// Capture packets and stores their information
/// </summary>
private void CapturePackets()
{
// Take the selected adapter
PacketDevice selectedDevice = allDevices[this.deviceIndex];
int prevInd = 0;
// Open the device
using (PacketCommunicator communicator =
selectedDevice.Open(65536, // portion of the packet to capture
// 65536 guarantees that the whole packet will be captured on all the link layers
PacketDeviceOpenAttributes.Promiscuous, // promiscuous mode
1000)) // read timeout
{
communicator.SetFilter(filter);
while (captFlag)
{
PacketCommunicatorReceiveResult result = communicator.ReceivePacket(out Packet packet);
byte[] packetInfo;
switch (result)
{
case PacketCommunicatorReceiveResult.Timeout:
// Timeout elapsed
break;
case PacketCommunicatorReceiveResult.Ok:
IpV4Datagram ipv4 = packet.Ethernet.IpV4;
IpV4Protocol i = ipv4.Protocol;
CougarPacket cp = new CougarPacket(packet.Timestamp.ToString("hh:mm:ss.fff"),
++packetNumber,
packet.Length,
ipv4.Source.ToString(),
ipv4.Destination.ToString());
packetInfo = Encoding.ASCII.GetBytes(cp.ToString() + "\n");
packetBytes.Add(packetInfo);
this.Invoke((MethodInvoker)(() =>
{
packetView.Items.Add(new ListViewItem(cp.toPropertyArray()));
++prevInd;
if (chkAutoScroll.Checked && prevInd > 12)
{
packetView.Items[packetView.Items.Count - 1].EnsureVisible();
prevInd = 0;
}
}));
break;
default:
throw new InvalidOperationException("The result " + result + " should never be reached here");
}
}
}
}
private void PrintPacket(Packet packet) // main packet handler method (should probably be renamed to the original HandleLoadedPacket name to make more sense)
{
/*if (packet.DataLink.Kind.ToString().Equals("Ethernet"))
* {
* //Console.WriteLine(packet.Ethernet.EtherType);
* if (packet.Ethernet.EtherType.ToString().Equals("IpV4"))
* {
* Console.WriteLine(packet.Ethernet.IpV4.Protocol);
* }
* }*/
// if (packet.Ethernet.IsValid)
{
++packetNumber;
CougarPacket cp = CougarPacket.DetermineCorrectPacketFormat(packet, sensorAddress, packetNumber); // create new cougarpacket wtih proper protocol information related to this particular packet
packets.Add(packet);
cougarpackets.Add(cp);
//if (cp.SourceAddress.ToString() != "0.0.0.0")
this.Invoke((MethodInvoker)(() => // this is used to access the main form from within a separate thread (i.e. this capture thread)
{
packetView.Items.Add(new ListViewItem(cp.ToPropertyArray)); // add packet info to listview (must be string array)
packetBytes.Add(Encoding.ASCII.GetBytes(cp.ToString() + "\n"));
if (adjusted == false) // these next few lines are for resizing the listview items. should only be called once after 10 packets have shown up
{
if ((packetNumber % 10 == 0))
{
packetView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
packetView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
adjusted = true;
}
}
if (chkAutoScroll.Checked)
{
packetView.Items[packetView.Items.Count - 1].EnsureVisible();
}
}));
}
}
