Subversion Repositories general

using System;

using System.Drawing;

using System.Collections;

using System.Windows.Forms;

using System.IO;

using System.Net;

using System.Text;

using System.Text.RegularExpressions;

using System.Xml;

// FIXME:

//   - add soap validation

//   - icons for all items in the tree

//   - update text view, not override whole text

//   - use pool of threads?

//   - do not store intermediate info, just row packets and the parsed fragments to display

//   - make the text fragment store switchable

namespace TCPproxy

{

	public class MainForm : System.Windows.Forms.Form

	{

		private System.ComponentModel.IContainer components;

		private System.Windows.Forms.Label label2;

		private System.Windows.Forms.Button startButton;

		private System.Windows.Forms.MenuItem saveXmlMenuItem;

		private System.Windows.Forms.ListBox logBox;

		private System.Windows.Forms.MenuItem tcpShowByTimeMenuItem;

		private System.Windows.Forms.SaveFileDialog saveLogDialog;

		private System.Windows.Forms.MenuItem clearMenuItem;

		private System.Windows.Forms.StatusBarPanel connectionStatusBar;

		private System.Windows.Forms.Label levelLabel;

		private TCPproxy.ViewControl messagesBox;

		private System.Windows.Forms.Panel panel3;

		private System.Windows.Forms.Button saveButton;

		private System.Windows.Forms.MenuItem saveHttpMenuItem;

		private System.Windows.Forms.TextBox resendPortBox;

		private System.Windows.Forms.MenuItem selectAllmenuItem;

		private System.Windows.Forms.Label label1;

		private System.Windows.Forms.MenuItem autoExpandMenuItem;

		private System.Windows.Forms.MenuItem copyMenuItem;

		private System.Windows.Forms.Splitter splitter2;

		private System.Windows.Forms.ContextMenu viewContextMenu;

		private System.Windows.Forms.TreeView messageView;

		private System.Windows.Forms.Splitter splitter1;

		private System.Windows.Forms.MenuItem saveTcpMenuItem;

		private System.Windows.Forms.Panel panel2;

		private System.Windows.Forms.Panel panel1;

		private System.Windows.Forms.MenuItem closeConnectionMenuItem;

		private System.Windows.Forms.Panel panel4;

		private System.Windows.Forms.ImageList saveButtonImageList;

		private System.Windows.Forms.StatusBar statusBar;

		private System.Windows.Forms.MenuItem saveLogMenuItem;

		private System.Windows.Forms.ContextMenu saveLogMenu;

		private System.Windows.Forms.Button stopButton;

		private System.Windows.Forms.ContextMenu messagesContextMenu;

		private System.Windows.Forms.MenuItem tcpShowByDirectionMenuItem;

		private System.Windows.Forms.TextBox listenPortBox;

		private System.Windows.Forms.ComboBox levelBox;

		private System.Windows.Forms.Button clearButton;

		private System.Windows.Forms.ImageList treeImageList;

		private System.Windows.Forms.MenuItem wordWrapMenuItem;

		private System.Windows.Forms.TextBox resendHostBox;

		#region private fields

		private TcpListener  tcpListener    = null;

		private LogMessages  logMessages    = null;

		private Hashtable    treeNodes      = new Hashtable();

		private TcpShowMode  tcpShowMode    = TcpShowMode.ByDirection;

		private bool         autoExpand     = true;

		#endregion private fields

		#region web forms fields

		#endregion web forms fields

		#region Windows Form Designer generated code

		/// <summary>

		/// Required method for Designer support - do not modify

		/// the contents of this method with the code editor.

		/// </summary>

		private void InitializeComponent() {

			this.components = new System.ComponentModel.Container();

			this.resendHostBox = new System.Windows.Forms.TextBox();

			this.wordWrapMenuItem = new System.Windows.Forms.MenuItem();

			this.treeImageList = new System.Windows.Forms.ImageList(this.components);

			this.clearButton = new System.Windows.Forms.Button();

			this.levelBox = new System.Windows.Forms.ComboBox();

			this.listenPortBox = new System.Windows.Forms.TextBox();

			this.tcpShowByDirectionMenuItem = new System.Windows.Forms.MenuItem();

			this.messagesContextMenu = new System.Windows.Forms.ContextMenu();

			this.stopButton = new System.Windows.Forms.Button();

			this.saveLogMenu = new System.Windows.Forms.ContextMenu();

			this.saveLogMenuItem = new System.Windows.Forms.MenuItem();

			this.statusBar = new System.Windows.Forms.StatusBar();

			this.saveButtonImageList = new System.Windows.Forms.ImageList(this.components);

			this.panel4 = new System.Windows.Forms.Panel();

			this.closeConnectionMenuItem = new System.Windows.Forms.MenuItem();

			this.panel1 = new System.Windows.Forms.Panel();

			this.panel2 = new System.Windows.Forms.Panel();

			this.saveTcpMenuItem = new System.Windows.Forms.MenuItem();

			this.splitter1 = new System.Windows.Forms.Splitter();

			this.messageView = new System.Windows.Forms.TreeView();

			this.viewContextMenu = new System.Windows.Forms.ContextMenu();

			this.splitter2 = new System.Windows.Forms.Splitter();

			this.copyMenuItem = new System.Windows.Forms.MenuItem();

			this.autoExpandMenuItem = new System.Windows.Forms.MenuItem();

			this.label1 = new System.Windows.Forms.Label();

			this.selectAllmenuItem = new System.Windows.Forms.MenuItem();

			this.resendPortBox = new System.Windows.Forms.TextBox();

			this.saveHttpMenuItem = new System.Windows.Forms.MenuItem();

			this.saveButton = new System.Windows.Forms.Button();

			this.panel3 = new System.Windows.Forms.Panel();

			this.messagesBox = new TCPproxy.ViewControl();

			this.levelLabel = new System.Windows.Forms.Label();

			this.connectionStatusBar = new System.Windows.Forms.StatusBarPanel();

			this.clearMenuItem = new System.Windows.Forms.MenuItem();

			this.saveLogDialog = new System.Windows.Forms.SaveFileDialog();

			this.tcpShowByTimeMenuItem = new System.Windows.Forms.MenuItem();

			this.logBox = new System.Windows.Forms.ListBox();

			this.saveXmlMenuItem = new System.Windows.Forms.MenuItem();

			this.startButton = new System.Windows.Forms.Button();

			this.label2 = new System.Windows.Forms.Label();

			this.panel4.SuspendLayout();

			this.panel1.SuspendLayout();

			this.panel2.SuspendLayout();

			this.panel3.SuspendLayout();

			((System.ComponentModel.ISupportInitialize)(this.connectionStatusBar)).BeginInit();

			this.SuspendLayout();

			//

			// resendHostBox

			//

			this.resendHostBox.Location = new System.Drawing.Point(88, 48);

			this.resendHostBox.Name = "resendHostBox";

			this.resendHostBox.TabIndex = 3;

			this.resendHostBox.Text = "";

			//

			// wordWrapMenuItem

			//

			this.wordWrapMenuItem.Index = 3;

			this.wordWrapMenuItem.Text = "Word &Wrap";

			this.wordWrapMenuItem.Click += new System.EventHandler(this.wordWrapMenuItem_Click);

			//

			// treeImageList

			//

			this.treeImageList.ImageSize = new System.Drawing.Size(16, 16);

			this.treeImageList.TransparentColor = System.Drawing.Color.Transparent;

			//

			// clearButton

			//

			this.clearButton.Location = new System.Drawing.Point(288, 16);

			this.clearButton.Name = "clearButton";

			this.clearButton.TabIndex = 6;

			this.clearButton.Text = "Clear";

			this.clearButton.Click += new System.EventHandler(this.clearButton_Click);

			//

			// levelBox

			//

			this.levelBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;

			this.levelBox.Items.AddRange(new object[] {

						"All",

						"Info",

						"Important"});

			this.levelBox.Location = new System.Drawing.Point(472, 16);

			this.levelBox.Name = "levelBox";

			this.levelBox.Size = new System.Drawing.Size(121, 21);

			this.levelBox.TabIndex = 8;

			this.levelBox.SelectedIndexChanged += new System.EventHandler(this.levelBox_SelectedIndexChanged);

			//

			// listenPortBox

			//

			this.listenPortBox.Location = new System.Drawing.Point(88, 16);

			this.listenPortBox.Name = "listenPortBox";

			this.listenPortBox.TabIndex = 2;

			this.listenPortBox.Text = "";

			//

			// tcpShowByDirectionMenuItem

			//

			this.tcpShowByDirectionMenuItem.Checked = true;

			this.tcpShowByDirectionMenuItem.Index = 1;

			this.tcpShowByDirectionMenuItem.Text = "TCP Show by &Direction";

			this.tcpShowByDirectionMenuItem.Click += new System.EventHandler(this.tcpShowByDirectionMenuItem_Click);

			//

			// messagesContextMenu

			//

			this.messagesContextMenu.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

						this.selectAllmenuItem,

						this.copyMenuItem,

						this.clearMenuItem,

						this.wordWrapMenuItem});

			this.messagesContextMenu.Popup += new System.EventHandler(this.messagesContextMenu_Popup);

			//

			// stopButton

			//

			this.stopButton.Location = new System.Drawing.Point(192, 16);

			this.stopButton.Name = "stopButton";

			this.stopButton.TabIndex = 5;

			this.stopButton.Text = "Stop";

			this.stopButton.Visible = false;

			this.stopButton.Click += new System.EventHandler(this.stopButton_Click);

			//

			// saveLogMenu

			//

			this.saveLogMenu.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

						this.saveLogMenuItem,

						this.saveTcpMenuItem,

						this.saveHttpMenuItem,

						this.saveXmlMenuItem});

			//

			// saveLogMenuItem

			//

			this.saveLogMenuItem.Index = 0;

			this.saveLogMenuItem.Text = "Save Log";

			this.saveLogMenuItem.Click += new System.EventHandler(this.saveLogMenuItem_Click);

			//

			// statusBar

			//

			this.statusBar.Location = new System.Drawing.Point(0, 619);

			this.statusBar.Name = "statusBar";

			this.statusBar.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {

						this.connectionStatusBar});

			this.statusBar.ShowPanels = true;

			this.statusBar.Size = new System.Drawing.Size(780, 22);

			this.statusBar.TabIndex = 0;

			//

			// saveButtonImageList

			//

			this.saveButtonImageList.ImageSize = new System.Drawing.Size(16, 16);

			this.saveButtonImageList.TransparentColor = System.Drawing.Color.Transparent;

			//

			// panel4

			//

			this.panel4.Controls.Add(this.messagesBox);

			this.panel4.Controls.Add(this.splitter2);

			this.panel4.Controls.Add(this.logBox);

			this.panel4.Dock = System.Windows.Forms.DockStyle.Fill;

			this.panel4.Location = new System.Drawing.Point(163, 0);

			this.panel4.Name = "panel4";

			this.panel4.Size = new System.Drawing.Size(617, 539);

			this.panel4.TabIndex = 13;

			//

			// closeConnectionMenuItem

			//

			this.closeConnectionMenuItem.Index = 0;

			this.closeConnectionMenuItem.Text = "&Close connection";

			this.closeConnectionMenuItem.Click += new System.EventHandler(this.closeConnectionMenuItem_Click);

			//

			// panel1

			//

			this.panel1.Controls.Add(this.panel3);

			this.panel1.Controls.Add(this.panel2);

			this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;

			this.panel1.Location = new System.Drawing.Point(0, 0);

			this.panel1.Name = "panel1";

			this.panel1.Size = new System.Drawing.Size(780, 619);

			this.panel1.TabIndex = 1;

			//

			// panel2

			//

			this.panel2.Controls.Add(this.levelLabel);

			this.panel2.Controls.Add(this.levelBox);

			this.panel2.Controls.Add(this.saveButton);

			this.panel2.Controls.Add(this.clearButton);

			this.panel2.Controls.Add(this.stopButton);

			this.panel2.Controls.Add(this.startButton);

			this.panel2.Controls.Add(this.label2);

			this.panel2.Controls.Add(this.label1);

			this.panel2.Controls.Add(this.resendPortBox);

			this.panel2.Controls.Add(this.resendHostBox);

			this.panel2.Controls.Add(this.listenPortBox);

			this.panel2.Dock = System.Windows.Forms.DockStyle.Bottom;

			this.panel2.Location = new System.Drawing.Point(0, 539);

			this.panel2.Name = "panel2";

			this.panel2.Size = new System.Drawing.Size(780, 80);

			this.panel2.TabIndex = 3;

			//

			// saveTcpMenuItem

			//

			this.saveTcpMenuItem.Index = 1;

			this.saveTcpMenuItem.Text = "Save TCP";

			this.saveTcpMenuItem.Click += new System.EventHandler(this.saveTcpMenuItem_Click);

			//

			// splitter1

			//

			this.splitter1.Location = new System.Drawing.Point(160, 0);

			this.splitter1.Name = "splitter1";

			this.splitter1.Size = new System.Drawing.Size(3, 539);

			this.splitter1.TabIndex = 12;

			this.splitter1.TabStop = false;

			//

			// messageView

			//

			this.messageView.ContextMenu = this.viewContextMenu;

			this.messageView.Dock = System.Windows.Forms.DockStyle.Left;

			this.messageView.HideSelection = false;

			this.messageView.ImageList = this.treeImageList;

			this.messageView.Location = new System.Drawing.Point(0, 0);

			this.messageView.Name = "messageView";

			this.messageView.Size = new System.Drawing.Size(160, 539);

			this.messageView.TabIndex = 11;

			this.messageView.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.messageView_AfterSelect);

			this.messageView.BeforeSelect += new System.Windows.Forms.TreeViewCancelEventHandler(this.messageView_BeforeSelect);

			//

			// viewContextMenu

			//

			this.viewContextMenu.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

						this.closeConnectionMenuItem,

						this.tcpShowByDirectionMenuItem,

						this.tcpShowByTimeMenuItem,

						this.autoExpandMenuItem});

			this.viewContextMenu.Popup += new System.EventHandler(this.listContextMenu_Popup);

			//

			// splitter2

			//

			this.splitter2.Dock = System.Windows.Forms.DockStyle.Bottom;

			this.splitter2.Location = new System.Drawing.Point(0, 468);

			this.splitter2.Name = "splitter2";

			this.splitter2.Size = new System.Drawing.Size(617, 3);

			this.splitter2.TabIndex = 9;

			this.splitter2.TabStop = false;

			//

			// copyMenuItem

			//

			this.copyMenuItem.Index = 1;

			this.copyMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlC;

			this.copyMenuItem.Text = "&Copy";

			this.copyMenuItem.Click += new System.EventHandler(this.copyMenuItem_Click);

			//

			// autoExpandMenuItem

			//

			this.autoExpandMenuItem.Index = 3;

			this.autoExpandMenuItem.Text = "Auto &Expand";

			this.autoExpandMenuItem.Click += new System.EventHandler(this.autoExpandMenuItem_Click);

			//

			// label1

			//

			this.label1.AutoSize = true;

			this.label1.Location = new System.Drawing.Point(8, 20);

			this.label1.Name = "label1";

			this.label1.Size = new System.Drawing.Size(73, 16);

			this.label1.TabIndex = 3;

			this.label1.Text = "Listen on port";

			//

			// selectAllmenuItem

			//

			this.selectAllmenuItem.Index = 0;

			this.selectAllmenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlA;

			this.selectAllmenuItem.Text = "Select &All";

			this.selectAllmenuItem.Click += new System.EventHandler(this.selectAllMenuItem_Click);

			//

			// resendPortBox

			//

			this.resendPortBox.Location = new System.Drawing.Point(192, 48);

			this.resendPortBox.Name = "resendPortBox";

			this.resendPortBox.Size = new System.Drawing.Size(72, 20);

			this.resendPortBox.TabIndex = 4;

			this.resendPortBox.Text = "";

			//

			// saveHttpMenuItem

			//

			this.saveHttpMenuItem.Index = 2;

			this.saveHttpMenuItem.Text = "Save HTTP";

			this.saveHttpMenuItem.Click += new System.EventHandler(this.saveHttpMenuItem_Click);

			//

			// saveButton

			//

			this.saveButton.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;

			this.saveButton.ImageList = this.saveButtonImageList;

			this.saveButton.Location = new System.Drawing.Point(288, 48);

			this.saveButton.Name = "saveButton";

			this.saveButton.TabIndex = 7;

			this.saveButton.Text = "Save Log";

			this.saveButton.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;

			this.saveButton.Click += new System.EventHandler(this.saveButton_Click);

			//

			// panel3

			//

			this.panel3.Controls.Add(this.panel4);

			this.panel3.Controls.Add(this.splitter1);

			this.panel3.Controls.Add(this.messageView);

			this.panel3.Dock = System.Windows.Forms.DockStyle.Fill;

			this.panel3.Location = new System.Drawing.Point(0, 0);

			this.panel3.Name = "panel3";

			this.panel3.Size = new System.Drawing.Size(780, 539);

			this.panel3.TabIndex = 5;

			//

			// messagesBox

			//

			this.messagesBox.ContextMenu = this.messagesContextMenu;

			this.messagesBox.Dock = System.Windows.Forms.DockStyle.Fill;

			this.messagesBox.Font = new System.Drawing.Font("Courier New", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));

			this.messagesBox.Location = new System.Drawing.Point(0, 0);

			this.messagesBox.Name = "messagesBox";

			this.messagesBox.Size = new System.Drawing.Size(617, 468);

			this.messagesBox.TabIndex = 7;

			this.messagesBox.WordWrap = true;

			//

			// levelLabel

			//

			this.levelLabel.AutoSize = true;

			this.levelLabel.Location = new System.Drawing.Point(384, 20);

			this.levelLabel.Name = "levelLabel";

			this.levelLabel.Size = new System.Drawing.Size(86, 16);

			this.levelLabel.TabIndex = 9;

			this.levelLabel.Text = "Messages Level";

			//

			// connectionStatusBar

			//

			this.connectionStatusBar.AutoSize = System.Windows.Forms.StatusBarPanelAutoSize.Spring;

			this.connectionStatusBar.Width = 764;

			//

			// clearMenuItem

			//

			this.clearMenuItem.Index = 2;

			this.clearMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlL;

			this.clearMenuItem.Text = "C&lear";

			this.clearMenuItem.Click += new System.EventHandler(this.clearButton_Click);

			//

			// saveLogDialog

			//

			this.saveLogDialog.DefaultExt = "txt";

			this.saveLogDialog.Filter = "Text Files|*.txt|All Files|*.*";

			this.saveLogDialog.Title = "Save Log";

			//

			// tcpShowByTimeMenuItem

			//

			this.tcpShowByTimeMenuItem.Index = 2;

			this.tcpShowByTimeMenuItem.Text = "TCP Show by &Time";

			this.tcpShowByTimeMenuItem.Click += new System.EventHandler(this.tcpShowByTimeMenuItem_Click);

			//

			// logBox

			//

			this.logBox.Dock = System.Windows.Forms.DockStyle.Bottom;

			this.logBox.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));

			this.logBox.HorizontalScrollbar = true;

			this.logBox.ItemHeight = 16;

			this.logBox.Location = new System.Drawing.Point(0, 471);

			this.logBox.Name = "logBox";

			this.logBox.ScrollAlwaysVisible = true;

			this.logBox.Size = new System.Drawing.Size(617, 68);

			this.logBox.TabIndex = 8;

			//

			// saveXmlMenuItem

			//

			this.saveXmlMenuItem.Index = 3;

			this.saveXmlMenuItem.Text = "Save XML";

			this.saveXmlMenuItem.Click += new System.EventHandler(this.saveXmlMenuItem_Click);

			//

			// startButton

			//

			this.startButton.Location = new System.Drawing.Point(192, 16);

			this.startButton.Name = "startButton";

			this.startButton.TabIndex = 5;

			this.startButton.Text = "Start";

			this.startButton.Click += new System.EventHandler(this.startButton_Click);

			//

			// label2

			//

			this.label2.AutoSize = true;

			this.label2.Location = new System.Drawing.Point(8, 52);

			this.label2.Name = "label2";

			this.label2.Size = new System.Drawing.Size(56, 16);

			this.label2.TabIndex = 4;

			this.label2.Text = "Resend to";

			//

			// MainForm

			//

			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

			this.ClientSize = new System.Drawing.Size(780, 641);

			this.Controls.Add(this.panel1);

			this.Controls.Add(this.statusBar);

			this.MinimumSize = new System.Drawing.Size(400, 200);

			this.Name = "MainForm";

			this.Text = "TCPproxy";

			this.panel4.ResumeLayout(false);

			this.panel1.ResumeLayout(false);

			this.panel2.ResumeLayout(false);

			this.panel3.ResumeLayout(false);

			((System.ComponentModel.ISupportInitialize)(this.connectionStatusBar)).EndInit();

			this.ResumeLayout(false);

		}

		#endregion

		#region windows forms methods

		public MainForm()

		{

			InitializeComponent();

			logMessages = new LogMessages(logBox);

			LoadFromRegistry();

			if(levelBox.SelectedIndex < 0) levelBox.SelectedIndex = 0;

		}

		protected override void Dispose( bool disposing )

		{

			if(tcpListener != null)

			{

				tcpListener.StopListening();    // stop listening

				tcpListener.CancelAll();        // cancel all open connections

			}

			SaveToRegistry();   // save settings

			if( disposing )

			{

				if (components != null)

				{

					components.Dispose();

				}

			}

			base.Dispose( disposing );

		}

		[STAThread]

		static void Main()

		{

			Application.Run(new MainForm());

		}

		private void LoadFromRegistry()

		{

			Microsoft.Win32.RegistryKey subkey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(

				@"Software\Echelon\TCPproxy");

			if(subkey != null)

			{

				listenPortBox.Text     = (string)subkey.GetValue("Listen Port", "");

				resendHostBox.Text     = (string)subkey.GetValue("Resend Host", "");

				resendPortBox.Text     = (string)subkey.GetValue("Resend Port", "");

				levelBox.SelectedIndex = (int)subkey.GetValue("Message Level", 0);

				autoExpand             = (int)subkey.GetValue("Auto Expand", 1) == 1;

				messagesBox.WordWrap   = (int)subkey.GetValue("Word Wrap", 1) == 1;

				object tcpShowModeStr  = (object)subkey.GetValue("Tcp Show Mode", TcpShowMode.ByDirection);

				tcpShowMode            = (tcpShowModeStr as string) == "ByDirection"

					? TcpShowMode.ByDirection : TcpShowMode.ByTime;

			}

		}

		private void SaveToRegistry()

		{

			Microsoft.Win32.RegistryKey subkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(

				@"Software\Echelon\TCPproxy");

			subkey.SetValue("Listen Port",   listenPortBox.Text);

			subkey.SetValue("Resend Host",   resendHostBox.Text);

			subkey.SetValue("Resend Port",   resendPortBox.Text);

			subkey.SetValue("Message Level", levelBox.SelectedIndex);

			subkey.SetValue("Tcp Show Mode", tcpShowMode);

			subkey.SetValue("Auto Expand",   autoExpand ? 1 : 0);

			subkey.SetValue("Word Wrap",     messagesBox.WordWrap ? 1 : 0);

		}

		private void startButton_Click(object sender, System.EventArgs e)

		{

			int       listenPort     = -1;

			IPAddress resendHost;

			int       resendPort     = -1;

			ArrayList tcpConnections = new ArrayList();

			// parse listen port

			try

			{

				listenPort = int.Parse(listenPortBox.Text);

			}

			catch(FormatException)

			{

				MessageBox.Show("Listen port must be an integer number");

				return;

			}

			// get resend host

			if(resendHostBox.Text == "")

			{

				resendHost = null;

			}

			else

			{

				Regex ipRegex = new Regex(@"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$");

				if(ipRegex.Match(resendHostBox.Text).Success)

				{

					try

					{

						resendHost = IPAddress.Parse(resendHostBox.Text);

					}

					catch(FormatException)

					{

						MessageBox.Show("Wrong IP address of the resend host");

						return;

					}

				}

				else

				{

					IPHostEntry hostInfo = Dns.GetHostByName(resendHostBox.Text);

					if(hostInfo.AddressList.Length > 0)

					{

						resendHost = hostInfo.AddressList[0];

					}

					else

					{

						MessageBox.Show("Cannot find IP address of the resend host");

						return;

					}

				}

				// parse resend port

				try

				{

					resendPort = int.Parse(resendPortBox.Text);

				}

				catch(FormatException)

				{

					MessageBox.Show("Resend port must be an integer number");

					return;

				}

			}

			// listen to the port

			try

			{

				Start(listenPort, resendHost, resendPort);

			}

			catch(Exception ex)

			{

				MessageBox.Show("Cannot start listening: " + ex.Message, "TCPproxy",

					MessageBoxButtons.OK, MessageBoxIcon.Error);

				Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

				return;

			}

			startButton.Visible   = false;

			stopButton.Visible    = true;

			listenPortBox.Enabled = false;

			resendHostBox.Enabled = false;

			resendPortBox.Enabled = false;

		}

		private void stopButton_Click(object sender, System.EventArgs e)

		{

			if(tcpListener != null) tcpListener.StopListening();

			startButton.Visible   = true;

			stopButton.Visible    = false;

			listenPortBox.Enabled = true;

			resendHostBox.Enabled = true;

			resendPortBox.Enabled = true;

		}

		private void clearButton_Click(object sender, System.EventArgs e)

		{

			treeNodes.Clear();

			messageView.Nodes.Clear();

			messagesBox.Clear();

			logMessages.Clear();

		}

		private void saveButton_Click(object sender, System.EventArgs e)

		{

			saveLogMenu.Show(saveButton, new Point(saveButton.Width, 0));

		}

		private void messagesContextMenu_Popup(object sender, System.EventArgs e)

		{

			wordWrapMenuItem.Checked = messagesBox.WordWrap;

		}

		private void selectAllMenuItem_Click(object sender, System.EventArgs e)

		{

			messagesBox.SelectAll();

		}

		private void copyMenuItem_Click(object sender, System.EventArgs e)

		{

			string sel = messagesBox.SelectedText;

			if(sel != null) Clipboard.SetDataObject(sel);

		}

		private void wordWrapMenuItem_Click(object sender, System.EventArgs e)

		{

			messagesBox.WordWrap = !messagesBox.WordWrap;

		}

		private void autoExpandMenuItem_Click(object sender, System.EventArgs e)

		{

			autoExpand = !autoExpand;

		}

		private void messageView_BeforeSelect(object sender, System.Windows.Forms.TreeViewCancelEventArgs e)

		{

			if(messageView.SelectedNode == null) return;

			object tag = messageView.SelectedNode.Tag;

			if(tag is TreeNodeData)

			{

				TreeNodeData data = (TreeNodeData)tag;

				data.SaveViewState();

			}

		}

		private void messageView_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)

		{

			if(messageView.SelectedNode == null) return;

			object tag = messageView.SelectedNode.Tag;

			if(tag is TreeNodeData)

			{

				TreeNodeData data = (TreeNodeData)tag;

				data.Show();

			}

		}

		private void closeConnectionMenuItem_Click(object sender, System.EventArgs e)

		{

			if(messageView.SelectedNode == null) return;

			object tag = messageView.SelectedNode.Tag;

			if(tag is TcpNodeData)

				CloseTcpConnection(((TcpNodeData)tag).Tcp);

			else if(tag is TcpNodeData)

				CloseTcpConnection(((TcpNodeData)messageView.SelectedNode.Parent.Tag).Tcp);

			else if(tag is XmlNodeData)

				CloseTcpConnection(((TcpNodeData)messageView.SelectedNode.Parent.Parent.Tag).Tcp);

		}

		private void tcpShowByDirectionMenuItem_Click(object sender, System.EventArgs e)

		{

			tcpShowMode = TcpShowMode.ByDirection;

			if(messageView.SelectedNode == null) return;

			object tag = messageView.SelectedNode.Tag;

			if(tag is TcpNodeData)

				UpdateTcpNodeInternal(((TcpNodeData)tag).Tcp);

		}

		private void tcpShowByTimeMenuItem_Click(object sender, System.EventArgs e)

		{

			tcpShowMode = TcpShowMode.ByTime;

			if(messageView.SelectedNode == null) return;

			object tag = messageView.SelectedNode.Tag;

			if(tag is TcpNodeData)

				UpdateTcpNodeInternal(((TcpNodeData)tag).Tcp);

		}

		private void listContextMenu_Popup(object sender, System.EventArgs e)

		{

			if(tcpShowMode == TcpShowMode.ByDirection)

			{

				tcpShowByDirectionMenuItem.Checked = true;

				tcpShowByTimeMenuItem.Checked      = false;

			}

			else

			{

				tcpShowByDirectionMenuItem.Checked = false;

				tcpShowByTimeMenuItem.Checked      = true;

			}

			autoExpandMenuItem.Checked = autoExpand;

		}

		private void saveLogMenuItem_Click(object sender, System.EventArgs e)

		{

			if(saveLogDialog.ShowDialog() == DialogResult.OK)

			{

				SaveLog(saveLogDialog.FileName);

			}

		}

		private void saveTcpMenuItem_Click(object sender, System.EventArgs e)

		{

			if(saveLogDialog.ShowDialog() == DialogResult.OK)

			{

				SaveTcp(saveLogDialog.FileName);

			}

		}

		private void saveHttpMenuItem_Click(object sender, System.EventArgs e)

		{

			if(saveLogDialog.ShowDialog() == DialogResult.OK)

			{

				SaveHttp(saveLogDialog.FileName);

			}

		}

		private void saveXmlMenuItem_Click(object sender, System.EventArgs e)

		{

			if(saveLogDialog.ShowDialog() == DialogResult.OK)

			{

				SaveXml(saveLogDialog.FileName);

			}

		}

		private void levelBox_SelectedIndexChanged(object sender, System.EventArgs e)

		{

			LogLevel level = LogLevel.Debug;

			if(levelBox.SelectedIndex == 1)

				level = LogLevel.Info;

			else if(levelBox.SelectedIndex == 2)

				level = LogLevel.Important;

			logMessages.Level = level;

		}

		#endregion windows forms methods

		#region core methods

		private void Start(int listenPort, IPAddress resendHost, int resendPort)

		{

			if(tcpListener != null) tcpListener.StopListening();

			tcpListener = new TcpListener(listenPort, resendHost, resendPort);

			tcpListener.Log    += new TcpLogEventHandler(TcpConnectionLog);

			tcpListener.NewTcp += new TcpConnectionEventHandler(AddTcpConnetion);

			tcpListener.StartListening();

		}

		private void CloseTcpConnection(TcpConnection tcp)

		{

			if(tcp == null) return;

			tcp.Cancel();

		}

		private void SaveLog(string fileName)

		{

			StreamWriter writer = new StreamWriter(fileName);

			foreach(LogMessage message in logMessages.Messages)

			{

				writer.WriteLine(message);

			}

			writer.Close();

		}

		private void SaveTcp(string fileName)

		{

			StreamWriter writer = new StreamWriter(fileName);

			foreach(TreeNode tcpNode in messageView.Nodes)

			{

				TcpNodeData data = (TcpNodeData)tcpNode.Tag;

				data.WriteLog(writer);

			}

			writer.Close();

		}

		private void SaveHttp(string fileName)

		{

			StreamWriter writer = new StreamWriter(fileName);

			foreach(TreeNode tcpNode in messageView.Nodes)

			{

				foreach(TreeNode httpNode in tcpNode.Nodes)

				{

					HttpNodeData data = (HttpNodeData)httpNode.Tag;

					data.WriteLog(writer);

				}

			}

			writer.Close();

		}

		private void SaveXml(string fileName)

		{

			StreamWriter writer = new StreamWriter(fileName);

			foreach(TreeNode tcpNode in messageView.Nodes)

			{

				foreach(TreeNode httpNode in tcpNode.Nodes)

				{

					foreach(TreeNode xmlNode in httpNode.Nodes)

					{

						XmlNodeData data = (XmlNodeData)xmlNode.Tag;

						data.WriteLog(writer);

					}

				}

			}

			writer.Close();

		}

		#endregion core methods

		#region network events handlers

		private void TcpConnectionLog(object sender, TcpLogEventArgs e)

		{

			TcpConnection tcp = sender as TcpConnection;

			LogMessage message = new LogMessage(tcp, e.Level, e.Message, e.Exception);

			try

			{

				this.BeginInvoke(new AddLogMessageHandler(AddLogMessageInternal), new object[] { message } );

			}

			catch(InvalidOperationException ex)

			{

				if(!this.Disposing && !this.IsDisposed)

					Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

			}

		}

		private void AddTcpConnetion(object sender, TcpConnectionEventArgs e)

		{

			e.Tcp.Log     += new TcpLogEventHandler(TcpConnectionLog);

			e.Tcp.Update  += new TcpEventHandler(UpdateTcpNode);

			e.Tcp.Close   += new TcpEventHandler(UpdateTcpNode);

			e.Tcp.NewHttp += new TcpHttpEventHandler(AddHttpMessageNode);

			try

			{

				this.BeginInvoke(new AddTcpNodeHandler(AddTcpNodeInternal), new object[] { e.Tcp } );

			}

			catch(InvalidOperationException ex)

			{

				if(!this.Disposing && !this.IsDisposed)

					Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

			}

		}

		private void UpdateTcpNode(object sender, TcpEventArgs e)

		{

			try

			{

				this.BeginInvoke(new UpdateTcpNodeHandler(UpdateTcpNodeInternal), new object[] { (TcpConnection)sender } );

			}

			catch(InvalidOperationException ex)

			{

				if(!this.Disposing && !this.IsDisposed)

					Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

			}

		}

		private void AddHttpMessageNode(object sender, TcpHttpEventArgs e)

		{

			e.Http.Update += new TcpEventHandler(UpdateHttpNode);

			try

			{

				this.BeginInvoke(new AddHttpNodeHandler(AddHttpNodeInternal),

					new object[] { (TcpConnection)sender, e.Http } );

			}

			catch(InvalidOperationException ex)

			{

				if(!this.Disposing && !this.IsDisposed)

					Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

			}

		}

		private void UpdateHttpNode(object sender, TcpEventArgs e)

		{

			try

			{

				this.BeginInvoke(new UpdateHttpNodeHandler(UpdateHttpNodeInternal), new object[] { (HttpMessage)sender } );

			}

			catch(InvalidOperationException ex)

			{

				if(!this.Disposing && !this.IsDisposed)

					Console.WriteLine(ex.Message + " (" + ex.GetType().Name + ")\n" + ex.StackTrace);

			}

		}

		#endregion network events handlers

		#region handlers for async GUI events

		private delegate void AddLogMessageHandler(LogMessage message);

		private delegate void AddTcpNodeHandler(TcpConnection tcp);

		private delegate void UpdateTcpNodeHandler(TcpConnection tcp);

		private delegate void AddHttpNodeHandler(TcpConnection tcp, HttpMessage http);

		private delegate void UpdateHttpNodeHandler(HttpMessage http);

		private void AddLogMessageInternal(LogMessage message)

		{

			logMessages.Add(message);

			if(message.Exception != null)

			{

				Console.WriteLine(message.Exception.Message + " (" + message.Exception.GetType().Name

					+ ")\n" + message.Exception.StackTrace);

			}

		}

		private void AddTcpNodeInternal(TcpConnection tcp)

		{

			TreeNode    treeNode = new TreeNode(tcp.ToString());

			TcpNodeData data     = new TcpNodeData(this, treeNode);

			data.Tcp = tcp;

			treeNode.Tag                = data;

			treeNode.ImageIndex         = 1;

			treeNode.SelectedImageIndex = 1;

			treeNodes[tcp] = data;

			messageView.Nodes.Add(treeNode);

			treeNode.EnsureVisible();

		}

		private void UpdateTcpNodeInternal(TcpConnection tcp)

		{

			TcpNodeData data = treeNodes[tcp] as TcpNodeData;

			if(data == null) throw new ArgumentException("Unknown TCP node");

			string title = tcp.ToString();

			if(title != data.Node.Text) data.Node.Text = title;

			if(tcp.LocalState == SocketState.Closed && tcp.RemoteState == SocketState.Closed)

			{

				data.Node.ImageIndex         = 2;

				data.Node.SelectedImageIndex = 2;

			}

			if(messageView.SelectedNode == null || data != messageView.SelectedNode.Tag)

				data.ViewExpired = true;  // got update for invisible TCP node, update it later

			else

				data.Show();

		}

		private void AddHttpNodeInternal(TcpConnection tcp, HttpMessage http)

		{

			TreeNode     treeNode = new TreeNode(http.ToString());

			HttpNodeData data     = new HttpNodeData(this, treeNode);

			data.Http = http;

			treeNode.Tag = data;

			treeNodes[http] = data;

			TcpNodeData tcpData = treeNodes[tcp] as TcpNodeData;

			if(tcpData == null) throw new ArgumentException("No node found for TCP message");

			tcpData.Node.Nodes.Add(treeNode);

			if(autoExpand) tcpData.Node.Expand();

			tcpData.Node.EnsureVisible();

		}

		private void UpdateHttpNodeInternal(HttpMessage http)

		{

			HttpNodeData httpData = treeNodes[http] as HttpNodeData;

			if(httpData == null) throw new ArgumentException("No node found for HTTP message");

			string title = http.ToString();

			if(httpData.Node.Text != title) httpData.Node.Text = title;

			if(!httpData.RequestXmlShown && http.RequestXml != null)

			{

				httpData.RequestXmlShown = true;

				AddXmlNode(httpData.Node, "Request XML", http.RequestXml);

				if(autoExpand) httpData.Node.Expand();

			}

			if(!httpData.ResponseXmlShown && http.ResponseXml != null)

			{

				httpData.ResponseXmlShown = true;

				AddXmlNode(httpData.Node, "Response XML", http.ResponseXml);

				if(autoExpand) httpData.Node.Expand();

			}

			// update text view

			if(messageView.SelectedNode == null || httpData != messageView.SelectedNode.Tag)

				httpData.ViewExpired = true;

			else

				httpData.Show();

		}

		private void AddXmlNode(TreeNode parent, string title, XmlMessage xml)

		{

			TreeNode    treeNode = new TreeNode(title);

			XmlNodeData data = new XmlNodeData(this, treeNode);

			data.Xml       = xml;

			treeNode.Tag   = data;

			treeNodes[xml] = data;

			parent.Nodes.Add(treeNode);

		}

		#endregion handlers for async GUI events

		#region node display classes

		private abstract class TreeNodeData

		{

			protected TreeNode node;

			protected object   viewState;

			protected bool     viewExpired;

			protected MainForm owner;

			protected bool     shown = false;

			public TreeNode Node

			{

				get { return node; }

			}

			public TreeNodeData(MainForm owner, TreeNode node)

			{

				this.owner = owner;

				this.node  = node;

			}

			public bool ViewExpired

			{

				get { return viewExpired; }

				set { viewExpired = value; }

			}

			public void SaveViewState()

			{

				viewState = owner.messagesBox.SaveState(false);

			}

			protected virtual bool ForceInitView()

			{

				return false;

			}

			protected abstract void InitView();

			protected abstract void UpdateView();

			public void Show()

			{

				if(!shown || viewState == null || ForceInitView())

				{

					InitView();

					shown = true;

					if(viewState == null) viewState = owner.messagesBox.SaveState(false);

				}

				else