基于C#實(shí)現(xiàn)端口掃描器(單線程和多線程)

更新時(shí)間：2022年07月27日 16:05:48 作者：Baker_Streets

本文主要介紹了基于C#分別通過(guò)單線程和多線程實(shí)現(xiàn)端口掃描，文中通過(guò)示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

一、新建項(xiàng)目并設(shè)置界面

新建項(xiàng)目：

選擇Windows窗體項(xiàng)目應(yīng)用(.Net Framework)：

設(shè)置項(xiàng)目名和路徑：

新建項(xiàng)目如下：

設(shè)置界面：

將tbShow設(shè)置為只讀:

二、單線程實(shí)現(xiàn)端口掃描

1. 編寫代碼

雙擊按鈕，編寫其點(diǎn)擊事件：

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 Scan
{
    public partial class Form1 : Form
    {


        //主機(jī)地址
        private string hostAddress;
        //起始端口
        private int start;
        //終止端口
        private int end;
        //端口號(hào)
        private int port;
        //定義線程對(duì)象
        private Thread scanThread;
        

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            try
            {
                //初始化
                tbShow.Clear();
                lb.Text = "0%";

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

                if (decideAddress()) // 端口合理
                {
                    //讓輸入的textbox只讀，無(wú)法改變
                    tbHost.ReadOnly = true;
                    tbSPort.ReadOnly = true;
                    tbEPort.ReadOnly = true;
                    //設(shè)置進(jìn)度條的范圍
                    pb.Minimum = start;
                    pb.Maximum = end;

                    //顯示框顯示
                    tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
                    //調(diào)用端口掃描函數(shù)
                    PortScan();
                }
                else
                {
                	//若端口號(hào)不合理，彈窗報(bào)錯(cuò)
                    MessageBox.Show("輸入錯(cuò)誤，端口范圍為[0-65536]!");
                }
            }
            catch
            {
				//若輸入的端口號(hào)為非整型，則彈窗報(bào)錯(cuò)
                MessageBox.Show("輸入錯(cuò)誤，端口范圍為[0-65536]!");
            }
        }

        /// <summary>
        /// 判斷端口是否合理
        /// </summary>
        /// <returns></returns>
        private bool decideAddress()
        {
            //判斷端口號(hào)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;
            //顯示掃描狀態(tài)
            tbShow.AppendText("開始掃描...（可能需要請(qǐng)您等待幾分鐘）" + Environment.NewLine + Environment.NewLine);
            //循環(huán)拋出線程掃描端口
            for (int i = start; i <= end; i++)
            {
                x = (double)(i - start + 1) / (end - start + 1);
                xian = x.ToString("0%");
                port = i;
                //調(diào)用端口i的掃描操作
                Scan();
                //進(jìn)度條值改變
                lb.Text = xian;
                lb.Refresh();
                pb.Value = i;
            }
            tbShow.AppendText(Environment.NewLine + "掃描結(jié)束！" + Environment.NewLine);
            //輸入框textbox只讀屬性取消
            tbHost.ReadOnly = false;
            tbSPort.ReadOnly = false;
            tbEPort.ReadOnly = false;
        }

        /// <summary>
        /// 掃描某個(gè)端口
        /// </summary>
        private void Scan()
        {
            int portnow = port;
            //創(chuàng)建TcpClient對(duì)象，TcpClient用于為TCP網(wǎng)絡(luò)服務(wù)提供客戶端連接
            TcpClient objTCP = null;
            try
            {
                //用于TcpClient對(duì)象掃描端口
                objTCP = new TcpClient(hostAddress, portnow);
                //掃描到則顯示到顯示框
                tbShow.AppendText("端口 " + port + " 開放！" + Environment.NewLine);
            }
            catch
            {
                //未掃描到，則會(huì)拋出錯(cuò)誤
            }
        }


    }
}

2. 運(yùn)行結(jié)果

可發(fā)現(xiàn)速度十分緩慢，且不能拖拽。

三、多線程實(shí)現(xiàn)端口掃描

1. 編寫代碼

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 Scan
{
    public partial class Form1 : Form
    {


        //主機(jī)地址
        private string hostAddress;
        //起始端口
        private int start;
        //終止端口
        private int end;
        //端口號(hào)
        private int port;
        //定義線程對(duì)象
        private Thread scanThread;
        //定義端口狀態(tài)數(shù)據(jù)（開放則為true，否則為false）
        private bool[] done = new bool[65526];
        private bool OK;


        public Form1()
        {
            InitializeComponent();
            //不進(jìn)行跨線程檢查
            CheckForIllegalCrossThreadCalls = false;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            try
            {
                //初始化
                tbShow.Clear();
                lb.Text = "0%";

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

                if (decideAddress()) // 端口合理
                {
                    //讓輸入的textbox只讀，無(wú)法改變
                    tbHost.ReadOnly = true;
                    tbSPort.ReadOnly = true;
                    tbEPort.ReadOnly = true;
                    //創(chuàng)建線程，并創(chuàng)建ThreadStart委托對(duì)象
                    Thread process = new Thread(new ThreadStart(PortScan));
                    process.Start();
                    //設(shè)置進(jìn)度條的范圍
                    pb.Minimum = start;
                    pb.Maximum = end;

                    //顯示框顯示
                    tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
                }
                else
                {
                    //若端口號(hào)不合理，彈窗報(bào)錯(cuò)
                    MessageBox.Show("輸入錯(cuò)誤，端口范圍為[0-65536]!");
                }

            }
            catch
            {
                //若輸入的端口號(hào)為非整型，則彈窗報(bào)錯(cuò)
                MessageBox.Show("輸入錯(cuò)誤，端口范圍為[0-65536]!");
            }
        }

        /// <summary>
        /// 判斷端口是否合理
        /// </summary>
        /// <returns></returns>
        private bool decideAddress()
        {
            //判斷端口號(hào)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;
            //顯示掃描狀態(tài)
            tbShow.AppendText("開始掃描...（可能需要請(qǐng)您等待幾分鐘）" + Environment.NewLine + Environment.NewLine);
            //循環(huán)拋出線程掃描端口
            for (int i = start; i <= end; i++)
            {
                x = (double)(i - start + 1) / (end - start + 1);
                xian = x.ToString("0%");
                port = i;
                //使用該端口的掃描線程
                scanThread = new Thread(new ThreadStart(Scan));
                scanThread.Start();
                //使線程睡眠
                System.Threading.Thread.Sleep(100);
                //進(jìn)度條值改變
                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 + "掃描結(jié)束！" + Environment.NewLine);
            //輸入框textbox只讀屬性取消
            tbHost.ReadOnly = false;
            tbSPort.ReadOnly = false;
            tbEPort.ReadOnly = false;
        }

        /// <summary>
        /// 掃描某個(gè)端口
        /// </summary>
        private void Scan()
        {
            int portnow = port;
            //創(chuàng)建線程變量
            Thread Threadnow = scanThread;
            //掃描端口，成功則寫入信息
            done[portnow] = true;
            //創(chuàng)建TcpClient對(duì)象，TcpClient用于為TCP網(wǎng)絡(luò)服務(wù)提供客戶端連接
            TcpClient objTCP = null;
            try
            {
                //用于TcpClient對(duì)象掃描端口
                objTCP = new TcpClient(hostAddress, portnow);
                //掃描到則顯示到顯示框
                tbShow.AppendText("端口 " + port + " 開放！" + Environment.NewLine);
            }
            catch
            {
                //未掃描到，則會(huì)拋出錯(cuò)誤
            }
        }


    }
}