using System;
using System.Windows.Forms;

namespace MyClasses
{

	public class PacketCDP
	{

		public struct PACKET_CDP_ADDRESS
		{
			public byte ProtocolType;
			public string ProtocolTypeStr;
			public byte ProtocolLength;
			public byte Protocol;
			public string ProtocolStr;
			public ushort AddressLength;
			public string IpAddress;
		}

		public struct PACKET_CDP_ADDRESSES
		{
			public ushort Type;
			public ushort Length;
			public uint AddressCount;
			public PACKET_CDP_ADDRESS [] IpAddresses;
		}


		public struct PACKET_CDP_CONTENTS
		{
			public ushort Type;
			public ushort Length;
			public string Name;
		}

		public struct PACKET_CDP
		{
			public byte Version;
			public byte TTL;
			public ushort Checksum;
			public PACKET_CDP_CONTENTS DeviceId;
			public PACKET_CDP_CONTENTS SoftwareVersion;
			public PACKET_CDP_CONTENTS Platform;
			public PACKET_CDP_ADDRESSES Addresses;
			public PACKET_CDP_CONTENTS PortId;
			public ushort CapabilitiesType;
			public ushort CapabilitiesLength;
			public uint CapabilitiesFlag;
			public string CapabilitiesFlagStr;
			public PACKET_CDP_CONTENTS VTP;
			public PACKET_CDP_CONTENTS Duplex;
		}


		
		public PacketCDP()
		{
		}


		public static string GetTypeList( ushort b )
		{
			int i = 0;
			string [] TypeList = new string[256];

			for( i = 0; i < 256; i ++ )
				TypeList[i] = "Unknown";

			TypeList[Const.TYPE_DEVICE_ID] = "Device ID";			TypeList[Const.TYPE_ADDRESS] = "Addresses";			TypeList[Const.TYPE_PORT_ID] = "Port ID";			TypeList[Const.TYPE_CAPABILITIES] = "Capabilities";			TypeList[Const.TYPE_IOS_VERSION] = "Software version";			TypeList[Const.TYPE_PLATFORM] = "Platform";			TypeList[Const.TYPE_IP_PREFIX] = "IP Prefix (used for ODR)";			TypeList[Const.TYPE_VTP_MGMT_DOMAIN] = "VTP Management Domain";			TypeList[Const.TYPE_NATIVE_VLAN] = "Native VLAN";			TypeList[Const.TYPE_DUPLEX] = "Duplex";
			return TypeList[b];

		}

		public static string GetProtocolSubTypeList( byte b )
		{
			int i = 0;
			string [] ProtocolSubTypeList = new string[256];

			for( i = 0; i < 256; i ++ )
				ProtocolSubTypeList[i] = "Unknown";

			ProtocolSubTypeList[Const.NLPID_NULL] = "NULL";			ProtocolSubTypeList[Const.NLPID_IPI_T_70] = "IP T.70";			ProtocolSubTypeList[Const.NLPID_SPI_X_29] = "SPI X.29";			ProtocolSubTypeList[Const.NLPID_X_633] = "X.633";			ProtocolSubTypeList[Const.NLPID_Q_931] = "Q931";			ProtocolSubTypeList[Const.NLPID_Q_2931] = "Q2931";			ProtocolSubTypeList[Const.NLPID_Q_2119] = "Q2119";			ProtocolSubTypeList[Const.NLPID_SNAP] = "SNAP";			ProtocolSubTypeList[Const.NLPID_ISO8473_CLNP] = "ISO 8473 CLNP";			ProtocolSubTypeList[Const.NLPID_ISO9542_ESIS] = "ISO 9542 ESIS";			ProtocolSubTypeList[Const.NLPID_ISO10589_ISIS] = "ISO 10589 ISIS";			ProtocolSubTypeList[Const.NLPID_ISO10747_IDRP] = " ISO 10747 IDRP";			ProtocolSubTypeList[Const.NLPID_ISO9542X25_ESIS] = "ISO 9542 X.25 ESIS";			ProtocolSubTypeList[Const.NLPID_ISO10030] = "ISO 10030";			ProtocolSubTypeList[Const.NLPID_ISO11577] = "ISO 11577";			ProtocolSubTypeList[Const.NLPID_IP6] = "IP.6";			ProtocolSubTypeList[Const.NLPID_COMPRESSED] = "COMPRESSED";			ProtocolSubTypeList[Const.NLPID_SNDCF] = "SNDCF";			ProtocolSubTypeList[Const.NLPID_IP] = "IP";			ProtocolSubTypeList[Const.NLPID_PPP] = "PPP";
			return ProtocolSubTypeList[b];

		}

		public static string GetProtocolTypeList( byte b )
		{
			int i = 0;
			string [] ProtocolTypeList = new string[256];

			for( i = 0; i < 256; i ++ )
				ProtocolTypeList[i] = "Unknown";

			ProtocolTypeList[Const.PROTO_TYPE_NLPID] = "NLPID";			ProtocolTypeList[Const.PROTO_TYPE_IEEE_802_2] = "802.2";
			return ProtocolTypeList[b];

		}

		public static bool Parser( ref TreeNodeCollection mNode, 
			byte [] PacketData , 
			ref int Index , 
			ref ListViewItem LItem )
		{
			TreeNode mNodex;
			TreeNode mNode1;
			TreeNode mNode2;
			string Tmp = "";
			uint ui = 0;
			int i = 0;
			int kk = 0;
			PACKET_CDP PCdp;


			mNodex = new TreeNode();
			mNodex.Text = "CDP ( Cisco Discovery Protocol )";
			kk = Index;

			try
			{
				PCdp.Version = PacketData[ Index++ ];
				Tmp = "Version :" + Function.ReFormatString( PCdp.Version , null );
				mNodex.Nodes.Add( Tmp );
				Function.SetPosition( ref mNodex , Index - 1 , 1 , false );

				PCdp.TTL = PacketData[ Index++ ];
				Tmp = "TTL :" + Function.ReFormatString( PCdp.TTL , null );
				mNodex.Nodes.Add( Tmp );
				Function.SetPosition( ref mNodex , Index - 1 , 1 , false );

				PCdp.Checksum = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Checksum :" + Function.ReFormatString( PCdp.Checksum , null );
				mNodex.Nodes.Add( Tmp );
				Function.SetPosition( ref mNodex , Index - 2 , 2 , false );

				// Device Id Section ................
				mNode1 = new TreeNode();
				mNode1.Text = "Device Id";

				PCdp.DeviceId.Type = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Type :" + Function.ReFormatString( PCdp.DeviceId.Type , GetTypeList(PCdp.DeviceId.Type) );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.DeviceId.Length = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Length :" + Function.ReFormatString( PCdp.DeviceId.Length , null );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.DeviceId.Name = "";
				for( i = 0; i < PCdp.DeviceId.Length - 4; i ++ )
					PCdp.DeviceId.Name += (char) PacketData[ Index++ ];

				Tmp = "Name : " + PCdp.DeviceId.Name;
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - PCdp.DeviceId.Length + 4 , PCdp.DeviceId.Length - 4 , false );

				Function.SetPosition( ref mNode1 , Index - PCdp.DeviceId.Length , PCdp.DeviceId.Length , true );

				mNodex.Nodes.Add( mNode1 );

				// Software Version Section ................
				mNode1 = new TreeNode();
				mNode1.Text = "Software Version";

				PCdp.SoftwareVersion.Type = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Type :" + Function.ReFormatString( PCdp.SoftwareVersion.Type , GetTypeList(PCdp.SoftwareVersion.Type) );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.SoftwareVersion.Length = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Length :" + Function.ReFormatString( PCdp.SoftwareVersion.Length , null );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.SoftwareVersion.Name = "";
				for( i = 0; i < PCdp.SoftwareVersion.Length - 4; i ++ )
					PCdp.SoftwareVersion.Name += (char) PacketData[ Index++ ];

				Tmp = "Name : " + PCdp.SoftwareVersion.Name;
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - PCdp.SoftwareVersion.Length + 4 , PCdp.SoftwareVersion.Length - 4 , false );

				Function.SetPosition( ref mNode1 , Index - PCdp.SoftwareVersion.Length , PCdp.SoftwareVersion.Length , true );

				mNodex.Nodes.Add( mNode1 );

				// Platform Section ................
				mNode1 = new TreeNode();
				mNode1.Text = "Platform";

				PCdp.Platform.Type = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Type :" + Function.ReFormatString( PCdp.Platform.Type , GetTypeList(PCdp.Platform.Type) );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.Platform.Length = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Length :" + Function.ReFormatString( PCdp.Platform.Length , null );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.Platform.Name = "";
				for( i = 0; i < PCdp.Platform.Length - 4; i ++ )
					PCdp.Platform.Name += (char) PacketData[ Index++ ];

				Tmp = "Name : " + PCdp.Platform.Name;
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - PCdp.Platform.Name.Length , PCdp.Platform.Name.Length , false );

				Function.SetPosition( ref mNode1 , Index - PCdp.Platform.Name.Length - 4 , PCdp.Platform.Name.Length + 4 , true );

				mNodex.Nodes.Add( mNode1 );

				// Addresses Section ................
				mNode1 = new TreeNode();
				mNode1.Text = "Addresses";

				PCdp.Addresses.Type = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Type :" + Function.ReFormatString( PCdp.Addresses.Type , GetTypeList(PCdp.Addresses.Type) );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.Addresses.Length = Function.Get2Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Length :" + Function.ReFormatString( PCdp.Addresses.Length , null );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 2 , 2 , false );

				PCdp.Addresses.AddressCount = Function.Get4Bytes( PacketData , ref Index , Const.NORMAL );
				Tmp = "Number of Addresses :" + Function.ReFormatString( PCdp.Addresses.AddressCount , null );
				mNode1.Nodes.Add( Tmp );
				Function.SetPosition( ref mNode1 , Index - 4 , 4 , false );

				Function.SetPosition( ref mNode1 , Index - 8 , 8 + (int) PCdp.Addresses.AddressCount * 9 , true );

				if( PCdp.Addresses.AddressCount > 0 )
				{
					PCdp.Addresses.IpAddresses = new PACKET_CDP_ADDRESS[PCdp.Addresses.AddressCount];
					for( i = 0; i < PCdp.Addresses.AddressCount; i ++ )
					{
						mNode2 = new TreeNode();
						Function.SetPosition( ref mNode2 , Index , 9 , true );

						PCdp.Addresses.IpAddresses[i].ProtocolType = PacketData[ Index++ ];
						Tmp = "Protocol Type :" + Function.ReFormatString( PCdp.Addresses.IpAddresses[i].ProtocolType , GetProtocolTypeList(PCdp.Addresses.IpAddresses[i].ProtocolType) );
						mNode2.Nodes.Add( Tmp );
						Function.SetPosition( ref mNode2 , Index - 1 , 1 , false );

						if( PCdp.Addresses.IpAddresses[i].ProtocolType == 1 ) PCdp.Addresses.IpAddresses[i].ProtocolTypeStr = "NLPID";