TCP编程-端口扫描器

端口扫描器

单一进程

在VS2019中

设计如图的界面

在Form1.cs中添加如下代码

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

namespace 端口扫描器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
        }
        //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;
        private void txtStart_TextChanged(object sender, System.EventArgs e)
        {
            //获取输入的起始端口值
            textBox1.Text = textBox2.Text;
        }
        private void txtEnd_TextChanged(object sender, System.EventArgs e)
        {
            //获取输入的结束端口值
            textBox2.Text = textBox3.Text;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //创建线程，并创建ThreadStart委托对象
            Thread process = new Thread(PortScan);
            process.Start();
            //显示端口扫描的范围
            progressBar1.Minimum = Int32.Parse(textBox2.Text);
            progressBar1.Maximum = Int32.Parse(textBox3.Text);
            //显示框初始化
            listBox1.Items.Clear();
            listBox1.Items.Add("端口扫描器 v1.0.");
            listBox1.Items.Add("");
        }
        private void PortScan()
        {
            start = Int32.Parse(textBox2.Text);
            end = Int32.Parse(textBox3.Text);
            //检查输入范围合法性
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
            {
                listBox1.Items.Add("开始扫描... (可能需要请您等待几分钟)");
                Addr = textBox1.Text;
                for (int i = start; i <= end; i++)
                {
                    progressBar1.Value = i;
                    lblNow.Text = i.ToString();
                    try
                    {
                        TcpClient tcp = new TcpClient(Addr, i);
                        listBox1.Items.Add("端口 " + i.ToString() + " 开放！");
                    }
                    catch
                    {
                    }
                }
                //for (int i = start; i <= end; i++)
                //{
                //    port = i;
                //    //使用该端口的扫描线程
                //    Thread 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);
                }
                listBox1.Items.Add("扫描结束!");
            }
            else
            {
                MessageBox.Show("输入错误，端口范围为[0-65536]");
            }
        }

运行结果如下

多进程

设置如上的界面

在Form.cs中写如下代码

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

namespace 端口扫描器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //禁止捕获错误线程
            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
        }
        //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;
        private void txtStart_TextChanged(object sender, System.EventArgs e)
        {
            //获取输入的起始端口值
            textBox1.Text = textBox2.Text;
        }
        private void txtEnd_TextChanged(object sender, System.EventArgs e)
        {
            //获取输入的结束端口值
            textBox2.Text = textBox3.Text;
        }

        private void button1_Click(object sender, 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(textBox2.Text);
            progressBar1.Maximum = Int32.Parse(textBox3.Text);
            //显示框初始化
            listBox1.Items.Clear();
            listBox1.Items.Add("端口扫描器 v1.0.");
            listBox1.Items.Add("");
        }
        private void PortScan()
        {
            start = Int32.Parse(textBox2.Text);
            end = Int32.Parse(textBox3.Text);
            //检查输入范围合法性
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
            {
                listBox1.Items.Add("开始扫描... (可能需要请您等待几分钟)");
                Addr = textBox1.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);
                }
                listBox1.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);
                listBox1.Items.Add("端口 " + portnow.ToString() + " 开放!");
            }
            catch
            {
            }
        }

    }  
}

运行结果

总结

可以明显的看到，多线程的速度比单线程快了不止一点点，深入理解了多线程和单线程的区别。