C#很久以前写的端口扫描工具

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

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        private System.Timers.Timer am = new System.Timers.Timer();

        public Form1()
        {
            InitializeComponent();

            am.Interval = 1000;

            am.Elapsed += new System.Timers.ElapsedEventHandler(am_Elapsed);
           
        }

        void am_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            if (tcp != null)
            {
                tcp.Close();
            }
            Thread.CurrentThread.Abort();
        }

       

        private static int i1, i2, i3, i4, d1,p1;

 

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                this.listView1.Clear();
                this.listView1.Columns.Add("IP", 100, HorizontalAlignment.Left);
                this.listView1.Columns.Add("端口"+this.textBox5.Text, 50, HorizontalAlignment.Left);
                this.listView1.Columns.Add("端口信息", 150, HorizontalAlignment.Left);

                i1 = int.Parse(this.textBox1.Text);
                i2 = int.Parse(this.textBox2.Text);
                i3 = int.Parse(this.textBox3.Text);
                i4 = int.Parse(this.textBox4.Text);

                d1 = int.Parse(textBox9.Text);
                p1 = int.Parse(this.textBox5.Text);

                if (i1 >= 255 || i2 >= 255 || i3 >= 255 || i4 >= 255||p1>65535)
                {
                    MessageBox.Show("你的开始IP 有误或端口号错误");
                    return;
                }
                else
                {
                    if (p1 == 80)
                    {
                        this.ds = " Connection: Closernrn";
                    }
                    else
                    {
                        this.ds = "";
                    }

                    this.progressBar1.Maximum = int.Parse(this.textBox9.Text);
                    this.progressBar1.Value = 1;

                    strat();
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);

            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.listView1.Columns.Add("IP", 100, HorizontalAlignment.Left);
            this.listView1.Columns.Add("端口"+this.textBox5.Text, 50, HorizontalAlignment.Left);
            this.listView1.Columns.Add("端口信息", 150, HorizontalAlignment.Left);

        }

        Thread[] thread;

        private void strat()
        {
            thread = new Thread[d1];
            int s = d1 - 1;

            while (true)
            {
                thread[s] = new Thread(new ThreadStart(dowhlies));

                thread[s].Start();

                s--;

                if (s == 0)
                    break;

            }

        }

        private string ips()
        {
            lock (this)
            {
                i4++;
                if (i4 == 254)
                {
                    i4 = 1;
                    i3++;
                }
                else if (i3 == 254)
                {
                    i3 = 0;
                    i2++;
                }
                else if (i2 == 254)
                {
                    i2 = 0;
                    i1++;
                }

                return i1.ToString() + "." + i2.ToString() + "." + i3.ToString() + "." + i4.ToString();
            }
        }

        private int d = 0;
        private int s = 1;

        private string ds = "";

        public AutoResetEvent asyncOpsAreDone = new AutoResetEvent(false);

        TcpClient tcp;

        private void dowhlies()
        {

            string dis = ips();

          
            string de = "";
            //string ds = " Connection: Closernrn";
           
            string getData="";
            try
            {
                tcp = new TcpClient();

                am.Start();
                tcp.Connect(dis, p1);
                am.Stop();

                de = "开放";
                Stream sm = tcp.GetStream();

                am.Start();
                sm.Write(Encoding.Default.GetBytes(ds.ToCharArray()), 0, ds.Length);
                am.Stop();

                StreamReader sr = new StreamReader(tcp.GetStream(), Encoding.Default);
                am.Start();
                getData = sr.ReadLine();
                am.Stop();
                if (getData.Length != 0)
                {
                    ds = p1 + "端口数据:" + getData.ToString();

                }
                else
                {
                    ds = "无端口数据";
                }

                sr.Close();
                sm.Close();
                tcp.Close();

                d = d + 1;
                label4.Text = "有" + d.ToString() + "主机获取端口成功..";

            }
            catch (IOException ed)
            {

                de = "开放";
                ds = ed.Message;
                d = d + 1;
                label4.Text = "有" + d.ToString() + "主机获取端口成功..";
            }
            catch (NullReferenceException ee)
            {
                de = "开放";
                ds = "目标装有防火墙";
                d = d + 1;
                label4.Text = "有" + d.ToString() + "主机获取端口成功..";

            }
            catch (Exception ex)
            {
                s = s + 1;
                de = "关闭";
                ds = ex.Message;
                label5.Text = "有" + s.ToString() + "主机获取端口失败..";
            }

 

            ListViewItem l1 = new ListViewItem();

            l1.SubItems[0].Text = dis;
            l1.SubItems.Add(de);
            l1.SubItems.Add(ds);
            this.listView1.Items.Add(l1);

            this.listView1.Update();

            this.progressBar1.Value++;

            asyncOpsAreDone.Close();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.listView1.Clear();
            this.d = 0;
            this.s = 0;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (thread != null)
            {
                for (int i = 0; i < thread.Length; i++)
                {
                    if (tcp != null)
                    {
                        tcp.Close();
                    }
                    thread[i].Abort();
                }
            }

        }

 

    }

 

}