基于C#实现的端口扫描器实例代码

本文所述为基于C#实现的端口扫描器代码，代码内包括了窗体和逻辑处理两部分代码。在代码中，创建TcpClient对象，把TcpClient用于为TCP网络服务提供客户端连接，创建线程，并创建ThreadStart委托对象，端口扫描范围为[0-65536]，也可自定义扫描范围。

功能主要代码如下：

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
namespace PortScanner
{
 public class Form1: System.Windows.Forms.Form
 {
 private System.Windows.Forms.TextBox txtAddr;
 private System.Windows.Forms.TextBox txtStart;
 private System.Windows.Forms.TextBox txtEnd;
 private System.Windows.Forms.Label label1;
 private System.Windows.Forms.Label label2;
 private System.Windows.Forms.Label label3;
 private System.Windows.Forms.Splitter splitter1;
 private System.Windows.Forms.ListBox lbResult;
 private System.Windows.Forms.Button btnScan;
 private System.Windows.Forms.ProgressBar progressBar1;
 private System.Windows.Forms.Label lblStart;
 private System.Windows.Forms.Label lblStop;
 private System.Windows.Forms.Label lblNow;
 //自定义变量
 private int port;
 private string Addr;
 private bool[] done = new bool[65536];
 private int start;
 private int end;
 private Thread scanThread;
 private bool OK;
 public Form1()
 {
  InitializeComponent();
 }
 private void InitializeComponent()
 {
  this.lbResult = new System.Windows.Forms.ListBox();
  this.txtAddr = new System.Windows.Forms.TextBox();
  this.txtStart = new System.Windows.Forms.TextBox();
  this.txtEnd = new System.Windows.Forms.TextBox();
  this.label1 = new System.Windows.Forms.Label();
  this.label2 = new System.Windows.Forms.Label();
  this.label3 = new System.Windows.Forms.Label();
  this.splitter1 = new System.Windows.Forms.Splitter();
  this.btnScan = new System.Windows.Forms.Button();
  this.progressBar1 = new System.Windows.Forms.ProgressBar();
  this.lblStart = new System.Windows.Forms.Label();
  this.lblStop = new System.Windows.Forms.Label();
  this.lblNow = new System.Windows.Forms.Label();
  this.SuspendLayout();
  //
  // lbResult
  //
  this.lbResult.Dock = System.Windows.Forms.DockStyle.Right;
  this.lbResult.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.lbResult.ItemHeight = 14;
  this.lbResult.Location = new System.Drawing.Point(224, 0);
  this.lbResult.Name = "lbResult";
  this.lbResult.Size = new System.Drawing.Size(264, 270);
  this.lbResult.TabIndex = 0;
  //
  // txtAddr
  //
  this.txtAddr.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.txtAddr.Location = new System.Drawing.Point(72, 16);
  this.txtAddr.Name = "txtAddr";
  this.txtAddr.Size = new System.Drawing.Size(136, 22);
  this.txtAddr.TabIndex = 1;
  this.txtAddr.Text = "";
  //
  // txtStart
  //
  this.txtStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.txtStart.Location = new System.Drawing.Point(72, 48);
  this.txtStart.Name = "txtStart";
  this.txtStart.Size = new System.Drawing.Size(136, 22);
  this.txtStart.TabIndex = 2;
  this.txtStart.Text = "";
  this.txtStart.TextChanged += new System.EventHandler(this.txtStart_TextChanged);
  //
  // txtEnd
  //
  this.txtEnd.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.txtEnd.Location = new System.Drawing.Point(72, 80);
  this.txtEnd.Name = "txtEnd";
  this.txtEnd.Size = new System.Drawing.Size(136, 22);
  this.txtEnd.TabIndex = 3;
  this.txtEnd.Text = "";
  this.txtEnd.TextChanged += new System.EventHandler(this.txtEnd_TextChanged);
  //
  // label1
  //
  this.label1.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.label1.Location = new System.Drawing.Point(8, 16);
  this.label1.Name = "label1";
  this.label1.Size = new System.Drawing.Size(64, 23);
  this.label1.TabIndex = 4;
  this.label1.Text = "主机地址";
  //
  // label2
  //
  this.label2.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.label2.Location = new System.Drawing.Point(8, 80);
  this.label2.Name = "label2";
  this.label2.Size = new System.Drawing.Size(64, 23);
  this.label2.TabIndex = 5;
  this.label2.Text = "结束端口";
  //
  // label3
  //
  this.label3.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.label3.Location = new System.Drawing.Point(8, 48);
  this.label3.Name = "label3";
  this.label3.Size = new System.Drawing.Size(64, 23);
  this.label3.TabIndex = 6;
  this.label3.Text = "起始端口";
  //
  // splitter1
  //
  this.splitter1.Dock = System.Windows.Forms.DockStyle.Right;
  this.splitter1.Location = new System.Drawing.Point(221, 0);
  this.splitter1.Name = "splitter1";
  this.splitter1.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
  this.splitter1.Size = new System.Drawing.Size(3, 273);
  this.splitter1.TabIndex = 7;
  this.splitter1.TabStop = false;
  //
  // btnScan
  //
  this.btnScan.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.btnScan.Location = new System.Drawing.Point(72, 200);
  this.btnScan.Name = "btnScan";
  this.btnScan.TabIndex = 8;
  this.btnScan.Text = "扫描";
  this.btnScan.Click += new System.EventHandler(this.btnScan_Click);
  //
  // progressBar1
  //
  this.progressBar1.Location = new System.Drawing.Point(8, 112);
  this.progressBar1.Name = "progressBar1";
  this.progressBar1.Size = new System.Drawing.Size(200, 23);
  this.progressBar1.Step = 1;
  this.progressBar1.TabIndex = 9;
  //
  // lblStart
  //
  this.lblStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.lblStart.Location = new System.Drawing.Point(8, 144);
  this.lblStart.Name = "lblStart";
  this.lblStart.Size = new System.Drawing.Size(48, 23);
  this.lblStart.TabIndex = 10;
  //
  // lblStop
  //
  this.lblStop.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.lblStop.Location = new System.Drawing.Point(160, 144);
  this.lblStop.Name = "lblStop";
  this.lblStop.Size = new System.Drawing.Size(48, 23);
  this.lblStop.TabIndex = 11;
  //
  // lblNow
  //
  this.lblNow.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.lblNow.Location = new System.Drawing.Point(84, 144);
  this.lblNow.Name = "lblNow";
  this.lblNow.Size = new System.Drawing.Size(48, 23);
  this.lblNow.TabIndex = 12;
  this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
  this.ClientSize = new System.Drawing.Size(488, 273);
  this.Controls.Add(this.lblNow);
  this.Controls.Add(this.lblStop);
  this.Controls.Add(this.lblStart);
  this.Controls.Add(this.progressBar1);
  this.Controls.Add(this.btnScan);
  this.Controls.Add(this.splitter1);
  this.Controls.Add(this.label3);
  this.Controls.Add(this.label2);
  this.Controls.Add(this.label1);
  this.Controls.Add(this.txtEnd);
  this.Controls.Add(this.txtStart);
  this.Controls.Add(this.txtAddr);
  this.Controls.Add(this.lbResult);
  this.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
  this.Name = "Form1";
  this.Text = "端口扫描器";
  this.ResumeLayout(false);
 }
 [STAThread]
 static void Main()
 {
  Application.Run(new Form1());
 }
 private void btnScan_Click(object sender, System.EventArgs e)
 {
  //创建线程，并创建ThreadStart委托对象
  Thread process = new Thread(new ThreadStart(PortScan));
  process.Start();
  //显示端口扫描的范围
  progressBar1.Minimum = Int32.Parse(txtStart.Text);
  progressBar1.Maximum = Int32.Parse(txtEnd.Text);
  //显示框初始化
  lbResult.Items.Clear();
  lbResult.Items.Add("端口扫描器 v1.0.");
  lbResult.Items.Add("");
 }
 private void PortScan()
 {
  start = Int32.Parse(txtStart.Text);
  end = Int32.Parse(txtEnd.Text);
  //检查输入范围合法性
  if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
  {
  lbResult.Items.Add("开始扫描... (可能需要请您等待几分钟)");
  Addr = txtAddr.Text;
  for (int i = start; i <= end; i++)
  {
   port = i;
   //使用该端口的扫描线程
   scanThread = new Thread(new ThreadStart(Scan));
   scanThread.Start();
   //使线程睡眠
   System.Threading.Thread.Sleep(100);
   progressBar1.Value = i;
   lblNow.Text = i.ToString();
  }
  //未完成时情况
  while (!OK)
  {
   OK = true;
   for (int i = start; i <= end; i++)
   {
   if (!done[i])
   {
    OK = false;
    break;
   }
   }
   System.Threading.Thread.Sleep(1000);
  }
  lbResult.Items.Add("扫描结束!");
  }
  else
  {
  MessageBox.Show("输入错误，端口范围为[0-65536]");
  }
 }
 private void Scan()
 {
  int portnow = port;
  //创建线程变量
  Thread Threadnow = scanThread;
  done[portnow] = true;
  //创建TcpClient对象，TcpClient用于为TCP网络服务提供客户端连接
  TcpClient objTCP = null;
  //扫描端口，成功则写入信息
  try
  {
  //用TcpClient对象扫描端口
  objTCP = new TcpClient(Addr, portnow);
  lbResult.Items.Add("端口 " + portnow.ToString() + " 开放!");
  }
  catch
  {
  }
 }
 private void txtStart_TextChanged(object sender, System.EventArgs e)
 {
  //获取输入的起始端口值
  lblStart.Text = txtStart.Text;
 }
 private void txtEnd_TextChanged(object sender, System.EventArgs e)
 {
  //获取输入的接受端口值
  lblStop.Text = txtEnd.Text;
 }
 }
}