TCP编程——端口扫描器与网游客户端

一、端口扫描器程序

1.1、单线程

1、创建工程

选择类型

设置界面


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.Net.Sockets;



namespace dan
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private int port;//记录当前扫描的端口号
        private string Address;//记录扫描的系统地址
        private bool[] done = new bool[65536];//记录端口的开放状态
        private int start;//记录扫描的起始端口
        private int end;//记录扫描的结束端口
        private bool OK;

        private void button1_Click(object sender, EventArgs e)
        {
            label4.Text = textBox2.Text;
            label6.Text = textBox3.Text;
            progressBar1.Minimum = Int32.Parse(textBox2.Text);
            progressBar1.Maximum = Int32.Parse(textBox3.Text);
            listBox1.Items.Clear();
            listBox1.Items.Add("端口扫描器v1.0.");
            listBox1.Items.Add("");
            PortScan();
        }
        private void PortScan()
        {
            start = Int32.Parse(textBox2.Text);
            end = Int32.Parse(textBox3.Text);
            //判断输入端口是否合法
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
            {
                listBox1.Items.Add("开始扫描：这个过程可能需要等待几分钟！");
                Address = textBox1.Text;
                for (int i = start; i <= end; i++)
                {
                    port = i;
                    Scan();
                    progressBar1.Value = i;
                    label5.Text = i.ToString();
                }
                while (!OK)
                {
                    OK = true;
                    for (int i = start; i <= end; i++)
                    {
                        if (!done[i])
                        {
                            OK = false;
                            break;
                        }
                    }
                }
                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;
            done[portnow] = true;
            TcpClient objTCP = null;
            try
            {
                objTCP = new TcpClient(Address, portnow);
                listBox1.Items.Add("端口" + portnow.ToString() + "开放");
            }
            catch
            {

            }
        }
    }
}

结果

1.2、多线程

代码

using System;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace PortScan
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //自定义变量
        private int port;//记录当前扫描的端口号
        private string Address;//记录扫描的系统地址
        private bool[] done = new bool[65536];//记录端口的开放状态
        private int start;//记录扫描的起始端口
        private int end;//记录扫描的结束端口
        private bool OK;
        private Thread scanThread;  
        //将输入的起始端口放到进度条的开始位置
        private void label4_TextChanged(object sender, EventArgs e)
        {
            label4.Text = textBox2.Text;
        }
        //将输入的结束地址放到进度条的结束位置
        private void label6_TextChanged(object sender, EventArgs e)
        {
            label6.Text = textBox3.Text;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            label4_TextChanged(sender, e);
            label6_TextChanged(sender, e);
            //创建线程，并创建ThreadStart委托对象
            Thread procss = new Thread(new ThreadStart(PortScan));
            procss.Start();
            //显示端口扫描范围
            progressBar1.Minimum = Int32.Parse(textBox2.Text);
            progressBar1.Maximum = Int32.Parse(textBox3.Text);
            //显示框的初始化
            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);
            //检查端口的合法性
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
            {
                listBox1.Items.Add("开始扫描：这个过程可能需要等待几分钟！");
                Address = textBox1.Text;
                for (int i = start; i <= end; i++)
                {
                    port = i;
                    //对该端口进行扫描的线程
                    scanThread = new Thread(Scan);
                    scanThread.Start();
                    //使线程睡眠
                    System.Threading.Thread.Sleep(100);
                    progressBar1.Value = i;
                    label5.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;
                        }
                    }
                }
                listBox1.Items.Add("扫描结束！");
                System.Threading.Thread.Sleep(1000);
            }
            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TCP网络服务提供客户端连接
            TcpClient objTCP = null;
            //扫描端口，成功就写入信息
            try
            {
                objTCP = new TcpClient(Address, portnow);
                listBox1.Items.Add("端口" + portnow.ToString() + "开放！");
            }
            catch
            {

            }
        }
    }
}