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;
}
}
}