using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Text;

 using System.Runtime.InteropServices;

 /// <summary>

 ///NetHelper 的摘要说明

 /// </summary>

 public class NetHelper

 {

     public NetHelper()

     {

     }

     public static string GetBrowserType()

     {

         return HttpContext.Current.Request.Browser.Type;

     }

     public static string GetSysVersion()

     {

         string Agent = HttpContext.Current.Request.ServerVariables["HTTP_USER_AGENT"];

         if (Agent.IndexOf("NT 4.0") > )

         {

             return "Windows NT ";

         }

         else if (Agent.IndexOf("NT 5.0") > )

         {

             return "Windows 2000";

         }

         else if (Agent.IndexOf("NT 5.1") > )

         {

             return "Windows XP";

         }

         else if (Agent.IndexOf("NT 5.2") > )

         {

             return "Windows 2003";

         }

         else if (Agent.IndexOf("NT 6.0") > )

         {

             return "Windows Vista";

         }

         else if (Agent.IndexOf("WindowsCE") > )

         {

             return "Windows CE";

         }

         else if (Agent.IndexOf("NT") > )

         {

             return "Windows NT ";

         }

         else if (Agent.IndexOf("9x") > )

         {

             return "Windows ME";

         }

         else if (Agent.IndexOf("") > )

         {

             return "Windows 98";

         }

         else if (Agent.IndexOf("") > )

         {

             return "Windows 95";

         }

         else if (Agent.IndexOf("Win32") > )

         {

             return "Win32";

         }

         else if (Agent.IndexOf("Linux") > )

         {

             return "Linux";

         }

         else if (Agent.IndexOf("SunOS") > )

         {

             return "SunOS";

         }

         else if (Agent.IndexOf("Mac") > )

         {

             return "Mac";

         }

         else if (Agent.IndexOf("Linux") > )

         {

             return "Linux";

         }

         else if (Agent.IndexOf("Windows") > )

         {

             return "Windows";

         }

         return "unknow";

     }

     /// <summary>

     /// 如果有代理那么越过代理直接取值

     /// </summary>

     /// <returns></returns>

     public static string GetClientIp()

     {

         if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)

             return HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();

         else

             return HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();

     }

     public static string GetHostName(string ipStr)

     {

         string hostName = string.Empty;

         try

         {

             System.Net.IPAddress ip = System.Net.IPAddress.Parse(ipStr);

             System.Net.IPHostEntry host = System.Net.Dns.GetHostEntry(ip);

             hostName = host.HostName;

         }

         catch

         { }

         return hostName;

     }

     [DllImport("Iphlpapi.dll")]

     static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 MacAddr, ref Int32 PhyAddrLen);

     [DllImport("Ws2_32.dll")]

     static extern Int32 inet_addr(string ipaddr);

     /// <summary>

     /// SendArp获取MAC地址

     /// </summary>

     /// <param name="RemoteIP">目标机器的IP地址如(192.168.1.1)</param>

     /// <returns>目标机器的mac 地址</returns>

     public static string getMacAddr_Remote(string RemoteIP)

     {

         StringBuilder macAddress = new StringBuilder();

         try

         {

             Int32 remote = inet_addr(RemoteIP);

             Int64 macInfo = new Int64();

             Int32 length = ;

             SendARP(remote, , ref macInfo, ref length);

             string temp = Convert.ToString(macInfo, ).PadLeft(, '').ToUpper();

             int x = ;

             for (int i = ; i < ; i++)

             {

                 if (i == )

                 {

                     macAddress.Append(temp.Substring(x - , ));

                 }

                 else

                 {

                     macAddress.Append(temp.Substring(x - , ) + "-");

                 }

                 x -= ;

             }

             return macAddress.ToString();

         }

         catch

         {

             return macAddress.ToString();

         }

     }

 }