How to check if localhost

Question

Is there a way in c# to check if the app is running on localhost (as opposed to a production server)?

I am writing a mass mailing program that needs to use a certain mail queue is it's running on localhost.

if (Localhost)
{
Queue = QueueLocal;
}
else
{
Queue = QueueProduction;
}

Answer 1

As a comment has the correct solution I'm going to post it as an answer:

HttpContext.Current.Request.IsLocal  

Answer 2

What about something like:

public static bool OnTestingServer()
    {
        string host = HttpContext.Current.Request.Url.Host.ToLower();
        return (host == "localhost");
    }

Answer 3

Use a value in the application configuration file that will tell you what environment you are on.

Since you are using asp.net, you can utilize config file transforms to ensure the setting is correct for each of your environments.

Answer 4

See if this works:

public static bool IsLocalIpAddress(string host)
{
  try
  { // get host IP addresses
    IPAddress[] hostIPs = Dns.GetHostAddresses(host);
    // get local IP addresses
    IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

    // test if any host IP equals to any local IP or to localhost
    foreach (IPAddress hostIP in hostIPs)
    {
      // is localhost
      if (IPAddress.IsLoopback(hostIP)) return true;
      // is local address
      foreach (IPAddress localIP in localIPs)
      {
        if (hostIP.Equals(localIP)) return true;
      }
    }
  }
  catch { }
  return false;
}

Reference: http://www.csharp-examples.net/local-ip/

Answer 5

Localhost ip address is constant, you can use it to determines if it´s localhost or remote user.

But beware, if you are logged in the production server, it will be considered localhost too.

This covers IP v.4 and v.6:

public static bool isLocalhost( )
{
    string ip = System.Web.HttpContext.Current.Request.UserHostAddress;
    return (ip == "127.0.0.1" || ip == "::1");
}

To be totally sure in which server the code is running at, you can use the MAC address:

public string GetMACAddress()
{
    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
    String sMacAddress = string.Empty;
    foreach (NetworkInterface adapter in nics)
    {
        if (sMacAddress == String.Empty)// only return MAC Address from first card  
        {
            IPInterfaceProperties properties = adapter.GetIPProperties();
            sMacAddress = adapter.GetPhysicalAddress().ToString();
        }
    } return sMacAddress;
}

from: http://www.c-sharpcorner.com/uploadfile/ahsanm.m/how-to-get-the-mac-address-of-system-using-Asp-NetC-Sharp/

And compare with a MAC address in web.config for example.

public static bool isLocalhost( )
{
    return GetMACAddress() == System.Configuration.ConfigurationManager.AppSettings["LocalhostMAC"].ToString();
}

Answer 6

Or, you could use a C# Preprocessor Directive if your simply targeting a development environment (this is assuming your app doesn't run in debug in production!):

#if debug
Queue = QueueLocal;
#else
Queue = QueueProduction;

Answer 7

Unfortunately there is no HttpContext.HttpRequest.IsLocal() anymore within core.

But after checking the original implementation in .Net, it is quite easy to reimplement the same behaviour by checking HttpContext.Connection:

private bool IsLocal(ConnectionInfo connection)
{
    var remoteAddress = connection.RemoteIpAddress.ToString();

    // if unknown, assume not local
    if (String.IsNullOrEmpty(remoteAddress))
        return false;

    // check if localhost
    if (remoteAddress == "127.0.0.1" || remoteAddress == "::1")
        return true;

    // compare with local address
    if (remoteAddress == connection.LocalIpAddress.ToString())
        return true;

    return false;
}

Answer 8

just like this:

HttpContext.Current.Request.IsLocal