Get Web Api consumer IP Address and HostName in ASP.NET Web API

Question

I have hosted Web Api developed in ASP.net. I want if someone call my API so I can log in database so later on if I want to reject request from particular id using C#.

What is best practice to get consumer IP and HostName?

public static string GetIP4Address()
  {
    string IP4Address = String.Empty;

    foreach (IPAddress IPA in Dns.GetHostAddresses(Request.ServerVariables["REMOTE_ADDR"].ToString())))
    {
      if (IPA.AddressFamily.ToString() == "InterNetwork")
      {
        IP4Address = IPA.ToString();
        break;
      }
    }

    if (IP4Address != String.Empty)
    {
      return IP4Address;
    }

    foreach (IPAddress IPA in Dns.GetHostAddresses(Dns.GetHostName()))
    {
      if (IPA.AddressFamily.ToString() == "InterNetwork")
      {
        IP4Address = IPA.ToString();
        break;
      }
    }

    return IP4Address;
  }

score 8 · Answer 1 · answered Mar 29 '13 at 23:21

8

Resolving names sounds like a bad idea. What if you are called from a client machine that dns doesn't resolve? I tell you, dns takes forever and then fails with an exception you have to catch and log as "unknown host name".

As for request address, just get it with

 HttpContext.Current.Request.UserHostAddress

answered Mar 29 '13 at 23:21

Wiktor Zychla

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@SOFUser - HttpContext.Current.Request.UserHostName` – Matt Johnson-Pint Mar 29 '13 at 23:31
@SOFUser - And if you read the comments in that very old article, you will see that the header he was looking at can easily be faked and that is not a recommended approach. – Matt Johnson-Pint Mar 29 '13 at 23:34
http://stackoverflow.com/questions/9726576/system-web-httpcontext-current-request-userhostaddress – SOF User Mar 30 '13 at 00:22

Get Web Api consumer IP Address and HostName in ASP.NET Web API

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