private TreeNode MakeTCPTreeNode(TCPHeader tcpHeader)
{
TreeNode tcpNode = new TreeNode();
tcpNode.Text = "TCP";
tcpNode.Nodes.Add("Source Port: " + tcpHeader.SourcePort);
tcpNode.Nodes.Add("Destination Port: " + tcpHeader.DestinationPort);
tcpNode.Nodes.Add("Sequence Number: " + tcpHeader.SequenceNumber);
if (tcpHeader.AcknowledgementNumber != "")
{
tcpNode.Nodes.Add("Acknowledgement Number: " + tcpHeader.AcknowledgementNumber);
}
tcpNode.Nodes.Add("Header Length: " + tcpHeader.HeaderLength);
tcpNode.Nodes.Add("Flags: " + tcpHeader.Flags);
tcpNode.Nodes.Add("Window Size: " + tcpHeader.WindowSize);
tcpNode.Nodes.Add("Checksum: " + tcpHeader.Checksum);
if (tcpHeader.UrgentPointer != "")
{
tcpNode.Nodes.Add("Urgent Pointer: " + tcpHeader.UrgentPointer);
}
return(tcpNode);
}
private void ParseData(byte[] byteData, int nReceived)
{
TreeNode rootNode = new TreeNode();
IPHeader ipHeader = new IPHeader(byteData, nReceived);
TreeNode ipNode = MakeIPTreeNode(ipHeader);
rootNode.Nodes.Add(ipNode);
switch (ipHeader.ProtocolType)
{
case Protocol.TCP:
if (Filter.tcp != true)
{
return;
}
TCPHeader tcpHeader = new TCPHeader(ipHeader.Data, ipHeader.MessageLength);
TreeNode tcpNode = MakeTCPTreeNode(tcpHeader);
rootNode.Nodes.Add(tcpNode);
if (tcpHeader.DestinationPort == "53" || tcpHeader.SourcePort == "53")
{
TreeNode dnsNode = MakeDNSTreeNode(tcpHeader.Data, (int)tcpHeader.MessageLength);
rootNode.Nodes.Add(dnsNode);
}
HeaderCounter.tcp++;
break;
case Protocol.UDP:
if (Filter.udp != true)
{
return;
}
UDPHeader udpHeader = new UDPHeader(ipHeader.Data, (int)ipHeader.MessageLength);
TreeNode udpNode = MakeUDPTreeNode(udpHeader);
rootNode.Nodes.Add(udpNode);
if (udpHeader.DestinationPort == "53" || udpHeader.SourcePort == "53")
{
if (Filter.dns != true)
{
return;
}
TreeNode dnsNode = MakeDNSTreeNode(udpHeader.Data,
Convert.ToInt32(udpHeader.Length) - 8);
rootNode.Nodes.Add(dnsNode);
HeaderCounter.dns++;
}
HeaderCounter.udp++;
break;
case Protocol.Unknown:
if (Filter.unknown != true)
{
return;
}
HeaderCounter.unknown++;
break;
}
displayCounter();
AddTreeNode addTreeNode = new AddTreeNode(OnAddTreeNode);
rootNode.Text = ipHeader.SourceAddress.ToString() + "-" +
ipHeader.DestinationAddress.ToString();
treeView.Invoke(addTreeNode, new object[] { rootNode });
}