C#端口扫描器的编写方法

目录

• 一、项目设计
• 二、单线程
• 三、多线程
• 小结

本文实例为大家分享了C#端口扫描器的编写代码，供大家参考，具体内容如下

一、项目设计

新建项目

整体设计

最终设计

二、单线程

1.代码编写

button

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace duankou
{
  public partial class Form1 : Form
  {

    private string hostAddress;
    //起始端口
    private int start;
    //终止端口
    private int end;
    //端口号
    private int port;
    //定义线程对象
    private Thread scanThread;
    public Form1()
    {
      InitializeComponent();
    }

    private void label1_Click(object sender, EventArgs e)
    {

    }

    private void label2_Click(object sender, EventArgs e)
    {

    }

    private void label4_Click(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
    {
      try
      {
        //初始化
        tbShow.Clear();
        lb.Text = "0%";

        //获取ip地址和始末端口号
        hostAddress = tbHost.Text;
        start = Int32.Parse(tbSPort.Text);
        end = Int32.Parse(tbEPort.Text);

        if (decideAddress()) // 端口合理
        {
          //让输入的textbox只读，无法改变
          tbHost.ReadOnly = true;
          tbSPort.ReadOnly = true;
          tbEPort.ReadOnly = true;
          //设置进度条的范围
          pb.Minimum = start;
          pb.Maximum = end;

          //显示框显示
          tbShow.AppendText("端口扫描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
          //调用端口扫描函数
          PortScan();
        }
        else
        {
          //若端口号不合理，弹窗报错
          MessageBox.Show("输入错误，端口范围为[0-65536]!");
        }
      }
      catch
      {
        //若输入的端口号为非整型，则弹窗报错
        MessageBox.Show("输入错误，端口范围为[0-65536]!");
      }
    }
    /// <summary>
    /// 判断端口是否合理
    /// </summary>
    /// <returns></returns>
    private bool decideAddress()
    {
      //判断端口号是否合理
      if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
        return true;
      else
        return false;
    }
    private void PortScan()
    {
      double x;
      string xian;
      //显示扫描状态
      tbShow.AppendText("开始扫描...（可能需要请您等待几分钟）" + Environment.NewLine + Environment.NewLine);
      //循环抛出线程扫描端口
      for (int i = start; i <= end; i++)
      {
        x = (double)(i - start + 1) / (end - start + 1);
        xian = x.ToString("0%");
        port = i;
        //调用端口i的扫描操作
        Scan();
        //进度条值改变
        lb.Text = xian;
        lb.Refresh();
        pb.Value = i;
      }
      tbShow.AppendText(Environment.NewLine + "扫描结束！" + Environment.NewLine);
      //输入框textbox只读属性取消
      tbHost.ReadOnly = false;
      tbSPort.ReadOnly = false;
      tbEPort.ReadOnly = false;
    }

    /// <summary>
    /// 扫描某个端口
    /// </summary>
    private void Scan()
    {
      int portnow = port;
      //创建TcpClient对象，TcpClient用于为TCP网络服务提供客户端连接
      TcpClient objTCP = null;
      try
      {
        //用于TcpClient对象扫描端口
        objTCP = new TcpClient(hostAddress, portnow);
        //扫描到则显示到显示框
        tbShow.AppendText("端口 " + port + " 开放！" + Environment.NewLine);
      }
      catch
      {
        //未扫描到，则会抛出错误
      }
    }

  }
}

2.扫描结果

开始

1分钟结束 没有端口开放

三、多线程

1.代码编写

button

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace duankou
{
  public partial class Form1 : Form
  {

    private string hostAddress;
    //起始端口
    private int start;
    //终止端口
    private int end;
    //端口号
    private int port;
    //定义线程对象
    private Thread scanThread;
    //定义端口状态数据（开放则为true，否则为false）
    private bool[] done = new bool[65526];
    private bool OK;
    public Form1()
    {
      InitializeComponent();
      //不进行跨线程检查
      CheckForIllegalCrossThreadCalls = false;
    }

    private void label1_Click(object sender, EventArgs e)
    {

    }

    private void label2_Click(object sender, EventArgs e)
    {

    }

    private void label4_Click(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
  python  {
      try
      {
        //初始化
        tbShow.Clear();
        lb.Text = "0%";

        //获取ip地址和始末端口号
        hostAddress = tbHost.Text;
        start = Int32.Parse(tbSPort.Text);
        end = Int32.Parse(tbEPort.Text);

        if (decidepythonAddress()) // 端口合理
        {
          //让输入的textbox只读，无法改变
          tbHost.ReadOnly = true;
          tbSPort.ReadOnly = true;
          tbEPort.ReadOnly = true;
          //创建线程，并创建ThreadStart委托对象
          Thread process = new Thread(new ThreadStart(PortScan));
          process.Start();
          //设置进度条的范围
          pb.Minimum = start;
          pb.Maximum = end;

          //http://www.devze.com显示框显示
          tbShow.AppendText("端口扫描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
        }
        else
        {
          //若端口号不合理，弹窗报错
          MessageBox.Show("输入错误，端口范围为[0-65536]!");
        }

      }
      catch
      {
        //若输入的端口号为非整型，则弹窗报错
        MessageBox.Show("输入错误，端口范围为[0-65536]!");
      }

    }
    /// <summary>
    /// 判断端口是否合理
    /// </summary>
    /// <returns></returns>
    private bool decideAddress()
    {
      //判断端口号是否合理
      if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
        return true;
      else
        return false;
    }
    private void PortScan()
    {
      double x;
      string xian;
      //显示扫描状态
      tbShow.AppendText("开始扫描...（可能需要请您等待几分钟）" + ELBCZSpVtnvironment.NewLine + Environment.NewLine);
      //循环抛出线程扫描端口
      for (int i = start; i <= end; i++)
      {
        x = (double)(i - start + 1) / (end - start + 1);
        xian = x.ToString("0%");
        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);
        //进度条值改变
        lb.Text = xian;
        pb.Value = i;
      }
      while (!OK)
      {
        OK = true;
        for (int i = start; i <= end; i++)
        {
          if (!done[i])
          {
            OK = false;
            break;
          }
        }
        System.Threading.Thread.Sleep(1000);
      }
      tbShow.AppendText(Environment.NewLine + "扫描结束！" + Environment.NewLine);
      //输入框textbox只读属性取消
      tbHost.ReadOnly = false;
      tbSPort.ReadOnly = false;
      tbEPort.ReadOnly = false;
    }

    /// <su编程mmary>
    /// 扫描某个端口
    /// </summary>
    private void Scan()
    {
      int portnow = port;
      //创建线程变量
      Thread Threadnow = scanThread;
      //扫描端口，成功则写入信息
      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;
      try
      {
        //用于TcpClient对象扫描端口
        objTCP = new TcpClient(hostAddress, portnow);
        //扫描到则显示到显示框
        tbShow.AppendText("端口 " + port + " 开放！" + Environment.NewLine);
      }
      catch
      {
        //未扫描到，则会抛出错误
      }
    }

  }
}

2.扫描结果

开始

5秒结束

小结

多线程能够有更好的CPU使用率，程序设计更简单，更快开发者_开发培训的程序响应速度。

链接

C#单线程和多线程端口扫描器

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