C#进行端口扫描的代码

using System;
using System.Net;
using System.Net.Sockets;
using System.Collections;
 
namespace PortScan
{
    class Program
    {
        static void Main(string[] args)
        {
            IPAddress ip;
            int startPort,endPort;
            if (GetPortRange(args,out ip,out startPort,out endPort) == true)  //提取命令行参数
            {
                Scan(ip,startPort,endPort);   //端口扫描
                Console.ReadKey();
            }
        }
 
        #region 从命令行参数 中提取端口 + static bool GetPortRange(string[] args,out int startPort,out int endPort)
        
        /// <summary>
        /// 从命令行参数 中提取端口
        /// </summary>
        /// <param name="args">命令行参数</param>
        /// <param name="ip">输出 IP地址</param>
        /// <param name="startPort">输出 起始端口号</param>
        /// <param name="endPort">输出 终止端口号</param>
        /// <returns>提取成功返回true，否则返回false</returns>
        private static bool GetPortRange(string[] args,out IPAddress ip,out int endPort)
        {
            ip = null;
            startPort = endPort = 0;
            //帮助 命令
            if (args.Length != 0 && (args[0] == "/?" || args[0] == "/help"))
            {
                Console.WriteLine("Scan port from startPort to endPort of the host specified by the IPAddress.");
                Console.WriteLine("Command Format:");
                Console.WriteLine("PortScan IPAddress startPort endPort");
                Console.WriteLine("For example:");
                Console.WriteLine("PortScan 127.0.0.1 1 1024");
                return false;
            }
            if (args.Length == 3)
            {
                //解析端口号成功
                if (IPAddress.TryParse(args[0],out ip) && int.TryParse(args[1],out startPort) && int.TryParse(args[2],out endPort))
                {
                    return true;
                }
                else
                {
                    Console.WriteLine("参数格式不正确！");
                    return false;
                }
            }
            else
            {
                Console.WriteLine("参数数目不正确！");
                return false;
            }
        }
        #endregion
 
        /// <summary>
        /// 端口 扫描
        /// </summary>
        /// <param name="ip">扫描的 IP地址</param>
        /// <param name="startPort">起始端口号</param>
        /// <param name="endPort">终止端口号</param>
        static void Scan(IPAddress ip,int startPort,int endPort)
        {
            Random rand = new Random((int)DateTime.Now.Ticks);
            Console.WriteLine("Begin Scan...");
            for (int port = startPort; port < endPort; port++)
            {
                Socket scanSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.IP);
                //寻找一个未使用的端口进行绑定
                do
                {
                    try
                    {
                        scanSocket.Bind(new IPEndPoint(IPAddress.Any,rand.Next(65535)));
                        break;
                    }
                    catch
                    {
                        //绑定失败
                    }
                } while (true);
                
                try
                {
                    scanSocket.BeginConnect(new IPEndPoint(ip,port),ScanCallBack,new ArrayList() { scanSocket,port});
                }
                catch
                {
                   // Console.WriteLine("port {0,5}tClosed.n{1}",port,ex.Message);
                    continue;
                }
               
            }
 
            Console.WriteLine("Port Scan Completed!");
        }
 
        /// <summary>
        /// BeginConnect的回调函数
        /// </summary>
        /// <param name="result">异步Connect的结果</param>
        static void ScanCallBack(IAsyncResult result)
        {
            //解析 回调函数输入 参数
            ArrayList arrList = (ArrayList)result.AsyncState;
            Socket scanSocket = (Socket)arrList[0];
            int port = (int)arrList[1];
            //判断端口是否开放
            if (result.IsCompleted && scanSocket.Connected)
            {
                Console.WriteLine("port {0,5}tOpen.",port);
            }
            else
            {
                //Console.WriteLine("port {0,5}tClosed.",port);
            }
            //关闭套接字
            scanSocket.Close();
        }
    }
}