public static bool Parser(ref TreeNodeCollection mNode,
byte [] PacketData,
ref int Index,
ref ListViewItem LItem, ref uint PreviousHttpSequence)
{
TreeNode mNodex;
TreeNode mNode1;
string Tmp = "";
PACKET_TCP PTcp;
mNodex = new TreeNode();
mNodex.Text = "TCP ( Transmission Control Protocol )";
Function.SetPosition(ref mNodex, Index, Const.LENGTH_OF_TCP, true);
if ((Index + Const.LENGTH_OF_TCP) > PacketData.Length)
{
mNode.Add(mNodex);
Tmp = "[ Malformed TCP packet. Remaining bytes don't fit an TCP packet. Possibly due to bad decoding ]";
mNode.Add(Tmp);
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = Tmp;
return(false);
}
try
{
PTcp.SourcePort = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Source Port : " + Function.ReFormatString(PTcp.SourcePort, Const.GetPortStr(PTcp.SourcePort));
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 2, 2, false);
PTcp.DestinationPort = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Destination Port : " + Function.ReFormatString(PTcp.DestinationPort, Const.GetPortStr(PTcp.DestinationPort));
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 2, 2, false);
PTcp.SequenceNumber = Function.Get4Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Sequence Number : " + Function.ReFormatString(PTcp.SequenceNumber, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 4, 4, false);
PTcp.Acknowledgement = Function.Get4Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Acknowledgement : " + Function.ReFormatString(PTcp.Acknowledgement, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 4, 4, false);
PTcp.HeaderLength = PacketData[Index++];
PTcp.HeaderLength = (byte)(((int)PTcp.HeaderLength >> 4) * 4);
Tmp = "Length : " + Function.ReFormatString(PTcp.HeaderLength, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 1, 1, false);
PTcp.Falgs = PacketData[Index++];
mNode1 = new TreeNode();
mNode1.Text = "Flags : " + Function.ReFormatString(PTcp.Falgs, null);
Function.SetPosition(ref mNode1, Index - 1, 1, true);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x80, "Congestion window reduced ( CWR ) : Set", "Congestion window reduced ( CWR ) : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x40, "ECN-Echo : Set", "ECN-Echo : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x20, "Urgent : Set", "Urgent : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x10, "Acknowldegement : Set", "Acknowldegement : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x08, "Push : Set", "Push : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x04, "Reset : Set", "Reset : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x02, "Sync : Set", "Sync : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNode1.Nodes.Add(Function.DecodeBitField(PTcp.Falgs, 0x01, "Fin : Set", "Fin : Not set"));
Function.SetPosition(ref mNode1, Index - 1, 1, false);
mNodex.Nodes.Add(mNode1);
PTcp.WindowSize = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Window Size : " + Function.ReFormatString(PTcp.WindowSize, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 2, 2, false);
PTcp.Checksum = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Checksum : " + Function.ReFormatString(PTcp.Checksum, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 2, 2, false);
PTcp.Options = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
Tmp = "Options : " + Function.ReFormatString(PTcp.Options, null);
mNodex.Nodes.Add(Tmp);
Function.SetPosition(ref mNodex, Index - 2, 2, false);
LItem.SubItems[Const.LIST_VIEW_PROTOCOL_INDEX].Text = "TCP";
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = "Source Port = " + PTcp.SourcePort.ToString() + " ( " + Const.GetPortStr(PTcp.SourcePort) + " ) , Destination Port = " + PTcp.DestinationPort.ToString() + " ( " + Const.GetPortStr(PTcp.DestinationPort) + " )";
mNode.Add(mNodex);
bool IsCifs = false;
if ((PTcp.SourcePort == Const.IPPORT_HTTP) ||
(PTcp.DestinationPort == Const.IPPORT_HTTP) ||
(PTcp.SourcePort == Const.IPPORT_HTTP2) ||
(PTcp.DestinationPort == Const.IPPORT_HTTP2))
{
if (PreviousHttpSequence == (PTcp.SequenceNumber - (PacketData.Length - 54)))
{
PreviousHttpSequence = PTcp.SequenceNumber;
PacketHTTP.Parser(ref mNode, PacketData, ref Index, ref LItem, false);
}
else
{
PreviousHttpSequence = 0;
PacketHTTP.Parser(ref mNode, PacketData, ref Index, ref LItem, true);
}
}
else if ((PTcp.SourcePort == Const.IPPORT_NBSSN) ||
(PTcp.DestinationPort == Const.IPPORT_NBSSN))
{
if ((PTcp.SourcePort == Const.TCP_PORT_CIFS) || (PTcp.DestinationPort == Const.TCP_PORT_CIFS))
{
IsCifs = true;
}
else
{
IsCifs = false;
}
PacketNBSS.Parser(ref mNode, PacketData, ref Index, ref LItem, IsCifs);
}
}
catch (Exception Ex)
{
mNode.Add(mNodex);
Tmp = "[ Malformed TCP packet. Remaining bytes don't fit an TCP packet. Possibly due to bad decoding ]";
mNode.Add(Tmp);
Tmp = "[ Exception raised is <" + Ex.GetType().ToString() + "> at packet index <" + Index.ToString() + "> ]";
mNode.Add(Tmp);
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = "[ Malformed TCP packet. Remaining bytes don't fit an TCP packet. Possibly due to bad decoding ]";
return(false);
}
return(true);
}
public static bool Parser(byte [] PacketData,
ref int Index,
ref ListViewItem LItem, ref uint PreviousHttpSequence)
{
string Tmp = "";
PACKET_TCP PTcp;
if ((Index + Const.LENGTH_OF_TCP) > PacketData.Length)
{
Tmp = "[ Malformed TCP packet. Remaining bytes don't fit an TCP packet. Possibly due to bad decoding ]";
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = Tmp;
return(false);
}
try
{
PTcp.SourcePort = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.DestinationPort = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.SequenceNumber = Function.Get4Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.Acknowledgement = Function.Get4Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.HeaderLength = PacketData[Index++];
PTcp.HeaderLength = (byte)(((int)PTcp.HeaderLength >> 4) * 4);
PTcp.Falgs = PacketData[Index++];
PTcp.WindowSize = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.Checksum = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
PTcp.Options = Function.Get2Bytes(PacketData, ref Index, Const.NORMAL);
LItem.SubItems[Const.LIST_VIEW_PROTOCOL_INDEX].Text = "TCP";
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = "Source Port = " + PTcp.SourcePort.ToString() + " ( " + Const.GetPortStr(PTcp.SourcePort) + " ) , Destination Port = " + PTcp.DestinationPort.ToString() + " ( " + Const.GetPortStr(PTcp.DestinationPort) + " )";
bool IsCifs = false;
if ((PTcp.SourcePort == Const.IPPORT_HTTP) ||
(PTcp.DestinationPort == Const.IPPORT_HTTP) ||
(PTcp.SourcePort == Const.IPPORT_HTTP2) ||
(PTcp.DestinationPort == Const.IPPORT_HTTP2))
{
if (PreviousHttpSequence == (PTcp.SequenceNumber - (PacketData.Length - 54)))
{
PreviousHttpSequence = PTcp.SequenceNumber;
PacketHTTP.Parser(PacketData, ref Index, ref LItem, false);
}
else
{
PreviousHttpSequence = 0;
PacketHTTP.Parser(PacketData, ref Index, ref LItem, true);
}
}
else if ((PTcp.SourcePort == Const.IPPORT_NBSSN) ||
(PTcp.DestinationPort == Const.IPPORT_NBSSN))
{
if ((PTcp.SourcePort == Const.TCP_PORT_CIFS) || (PTcp.DestinationPort == Const.TCP_PORT_CIFS))
{
IsCifs = true;
}
else
{
IsCifs = false;
}
PacketNBSS.Parser(PacketData, ref Index, ref LItem, IsCifs);
}
}
catch
{
LItem.SubItems[Const.LIST_VIEW_INFO_INDEX].Text = "[ Malformed TCP packet. Remaining bytes don't fit an TCP packet. Possibly due to bad decoding ]";
return(false);
}
return(true);
}