Seeking goodauth

Question

I'm trying to use the API to validate DynDNS credentials, and the documentation says that the 'badauth' response is meant for exactly that. Great! With that I can automate an update with some credentials and look for the badauth response and use that to detect incorrect credentials, sounds perfect.
The problem is that the only response I get is badauth. Even when I send credentials that should be good (since they're currently working and all) I get a badauth response. Here's my code:

       try
       {
         string target = string.Format( "http://{0}:{1}@members.dyndns.org:8245/nic/update?hostname={2}&myip={3}",
          HttpUtility.UrlEncode( DynDnsUserName ), HttpUtility.UrlEncode( DynDnsPassword ), HttpUtility.UrlEncode( DynDnsURL ), ip );
         HttpWebRequest request = WebRequest.Create( target ) as HttpWebRequest;
         request.Method = "GET";
         request.UserAgent = company + " - " + model + " - " + firmware;
         HttpWebResponse response = request.GetResponse() as HttpWebResponse;
         Stream reply = response.GetResponseStream();
         StreamReader readReply = new StreamReader( reply );
         string returnCode = readReply.ReadToEnd();
         Trace.WriteLine( "We've validated the provided DynDNS credentials, response received: " + returnCode );
         return !returnCode.Contains( "badauth" );
       }
       catch (WebException webEx)
       {
         Trace.WriteLine( "WebException thrown: " + webEx.Message );
         if (webEx.Response != null)
         {
          Stream reply = webEx.Response.GetResponseStream();
          StreamReader readReply = new StreamReader( reply );
          Trace.WriteLine( "Actual response: " + readReply.ReadToEnd() );
         }
       }

Any idea what I'm missing here?

Answer 1

Solution found!
In essence, the problem is Uri-embedded credentials. Don't use them!
Here's the code that fixed the problem entirely:

string target = string.Format( "http://members.dyndns.org:8245/nic/update?hostname={0}&myip={1}", HttpUtility.UrlEncode( DynDnsURL ), ip );
HttpWebRequest request = WebRequest.Create( target ) as HttpWebRequest;
request.Credentials = new NetworkCredential( DynDnsUserName, DynDnsPassword );

Even though WebRequest.Create accepts a Uri instance and Uri understands embedded credentials, HttpWebRequest.GetResponse obviously doesn't treat these two methods of specifying credentials equivalently because one works and the other doesn't.

Answer 2

0

I could imagine that you're locked out for a while if you attempted too many invalid authentications. You may have to wait several cups of coffee before it will work again with valid credentials.

answered Dec 02 at 08:22 PM

$RotBlitz\'s gravatar image$

RotBlitz ♦
27.9k ● 4 ● 14 ● 94

I would imagine that if that were the problem I'd be getting the 'abuse' response instead of the 'badauth' response. It's definitely a 401 Unauthorized exception being thrown with 'badauth' in the response body.

Dec 05 at 07:21 PM Task

Seeking goodauth

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