如何識別用戶是否在ASP.NET內部或外部我的網絡

Question

我必須確定接入是否來自我的本地網絡（與我的服務器相同的網絡）或來自互聯網。 （使用ASP.NET）

我打算創建一個額外的安全..我的意思是，如果訪問是從外部來的，我將只允許「特定用戶」。

我試圖在網上搜索，但我什麼也沒找到。

在此先感謝。

Answer 1

你可以做這樣的事情（啞代碼）

private bool IsInSameSubnet(IPAddress address, IPAddress address2, IPAddress subnetMask) { 
      bool isInSameSubnet = false; 
      IPAddress network1 = GetNetworkAddress(address, subnetMask); 
      IPAddress network2 = GetNetworkAddress(address2, subnetMask); 
      if (network1 != null && network2 != null) { 
       isInSameSubnet = network1.Equals(network2); 
      } 
      return isInSameSubnet; 
     } 
    private IPAddress GetNetworkAddress(IPAddress address, IPAddress subnetMask) { 

     byte[] ipAdressBytes = address.GetAddressBytes(); 
     byte[] subnetMaskBytes = subnetMask.GetAddressBytes(); 

     if (ipAdressBytes.Length != subnetMaskBytes.Length) 
      return null; 
     //throw new ArgumentException("Lengths of IP address and subnet mask do not match."); 

     byte[] broadcastAddress = new byte[ipAdressBytes.Length]; 
     for (int i = 0; i < broadcastAddress.Length; i++) { 
      broadcastAddress[i] = (byte)(ipAdressBytes[i] & (subnetMaskBytes[i])); 
     } 
     return new IPAddress(broadcastAddress); 
    } 

其中IsInSameSubnet地址檢查，如果是在同一個網絡

例如：

string computerIP = getIP(); 

      IPAddress ip1 = IPAddress.Parse(computerIP); 
      IPAddress ip2 = IPAddress.Parse("192.168.0.0"); 
      IPAddress subnetMask = IPAddress.Parse("255.255.0.0"); 

和getIp方法

public static string getIP() { 
      //if user behind proxy this should get it 
      string ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; 
      if (ip != null && ip.Split(',').Count() > 1) { 
       //if (ip.Split(',').Count() > 1) 
       ip = ip.Split(',')[0]; 
      } 

      //if user not behind proxy this should do it 
      if (ip == null) 
       ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; 
      return ip; 
     }