DynDns Update with c# client

[André Heuer]

Hi,

i want to write a .net class that can update my ip address at the dyndns
service (http://www.dyndns.org).

When I open the page
https://username:passwo rd@members.dynd ns.org/nic/update?system=d yndns&hostname= MyHostNameHere& myip=MyCurrentI pHere&wildcard= on

I get the response nochg 80.146.122.175 which means "No change". IP hasn´t changed. Fine.

I wrote this code in my c# class:

public void UpdateIP(IPAddress ip)
{
    const string UPDATE_URL =
"https://<USER>:<PWD>@members.dyndns.org/nic/update?system=dyndns&hostname=<
HOST>&myip=<IP>&wildcard=<WILDCARD>";

    string url = UPDATE_URL;
    url = url.Replace("<USER>", mUsername);
    url = url.Replace("<PWD>", mPassword);
    url = url.Replace("<HOST>", mDomain);
    url = url.Replace("<IP>", ip.ToString());
    url = url.Replace("<WILDCARD>", mWildcard ? "on" : "off");

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

    request.Headers.Add("Cache-control", "no-cache");
    request.Headers.Add("Pragma","no-cache");

    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    string text = new StreamReader(response.GetResponseStream()).ReadToEnd();

}

I get the following error on the line

"HttpWebResponse response =
(HttpWebResponse)request.GetResponse();":

'System.Net.WebException' in system.dll
Remote Server returned an error (403) Unzulässig.

What is the difference between the browser and my code? Any ideas?

Tia

André Heuer

[André Heuer]

Re: DynDns Update with c# client

Additional information. This code in vbs works fine.....

Function UpdateDynDnsSer vice(user,passw ord,hostname,ip address,wildcar d)
Dim xmlhttp,url,sta rtPos,endPos,te mpCmd

set xmlhttp = createobject("m icrosoft.xmlhtt p")
tempCmd = DYNDNSUPDATECMD
tempCmd = replace(DYNDNSU PDATECMD,"<USER >",user)
tempCmd = replace(tempCmd ,"<PWD>",passwo rd)
tempCmd = replace(tempCmd ,"<HOST>",hostn ame)
tempCmd = replace(tempCmd ,"<IP>",ipaddre ss)
tempCmd = replace(tempCmd ,"<WILDCARD>",w ildcard)
url = tempCmd
xmlhttp.open "get",url,f alse

wscript.echo tempcmd

xmlhttp.setrequ estheader "Pragma","n o-cache"
xmlhttp.setrequ estheader "Cache-control","no-cache"
On Error Resume Next
xmlhttp.send
If Err.Number<>0 Then
UpdateDynDnsSer vice = "Fail"
Exit Function
End If
On Error Goto 0
If (xmlhttp.Status = 200) then
UpdateDynDnsSer vice = CStr(xmlhttp.re sponsetext)
Else
If (xmlhttp.Status = 401) then
UpdateDynDnsSer vice = "badauth"
Else
UpdateDynDnsSer vice = "Fail"
End If
End If
End Function

[André Heuer]

Re: DynDns Update with c# client

i solved the problem:

public DynDnsUpdateRes ult UpdateIP(IPAddr ess ip)
{
byte[] data = new byte[1024];
string response = "";
int count;

// Syntax zum Aufruf: http://www.dyndns.org/developers/specs/syntax.html
Socket socket = new Socket(AddressF amily.InterNetw ork,
SocketType.Stre am,ProtocolType .Tcp);
IPHostEntry host = System.Net.Dns. Resolve("member s.dyndns.org");
socket.Connect( (EndPoint)(new IPEndPoint(host .AddressList[0], 80)));

if (!socket.Connec ted)
throw new Exception("Can´ t connect to dyndns service");

string request = "GET /nic/update?" +
"system=dyn dns" +
"&hostname= " + mDomain +
"&myip=" + ip.ToString() +
"&wildcard= " + (mWildcard ? "ON" : "OFF") +
"&offline=N O " +
"HTTP/1.1\r\n" +
"Host: members.dyndns. org\r\n" +
"Authorizat ion: Basic " +
System.Convert. ToBase64String( ASCIIEncoding.A SCII.GetBytes(m Username + ":" +
mPassword)) + "\r\n" +
"User-Agent: .net dyndns client\r\n\r\n" ;

count = socket.Send(Sys tem.Text.Unicod eEncoding.ASCII .GetBytes(reque st));

while((count = socket.Receive( data)) != 0) // Antwort von Server
response += System.Text.ASC IIEncoding.ASCI I.GetString(dat a, 0, count);

socket.Shutdown (SocketShutdown .Both);
socket.Close();

response = response.Substr ing(response.In dexOf("\r\n\r\n ") + 4); // Html
Header entfernen

switch (response.Subst ring(0, response.IndexO f(" ")).ToLower ())
{
case "good":
// The update was successful, and the hostname is now updated
return DynDnsUpdateRes ult.UpdatedIp;
case "nochg":
// The update changed no settings, and is considered abusive.
Additional nochg updates will cause the hostname to become blocked
return DynDnsUpdateRes ult.NoUpdateSam eIp;
case "badsys":
throw new Exception("The system parameter given is not valid. Valid
system parameters are dyndns, statdns and custom");
case "badagent":
throw new Exception("The user agent that was sent has been blocked for
not following these specifications or no user agent was specified");
case "badauth":
throw new Exception("The username or password specified are
incorrect");
case "!donator":
throw new Exception("An option available only to credited users (such
as offline URL) was specified, but the user is not a credited user");
case "notfqdn":
throw new Exception("The hostname specified is not a fully-qualified
domain name (not in the form hostname.dyndns .org or domain.com)");
case "nohost":
throw new Exception("The hostname specified does not exist (or is not
in the service specified in the system parameter)");
case "!yours":
throw new Exception("The hostname specified exists, but not under the
username specified");
case "abuse":
throw new Exception("The hostname specified is blocked for update
abuse");
case "numhost":
throw new Exception("Too many or too few hosts found");
case "dnserr":
throw new Exception("DNS error encountered");
case "911":
throw new Exception("Ther e is a serious problem on our side, such as a
database or DNS server failure. The client should stop updating until
notified via the status page that the service is back up.");
default:
throw new Exception("Unkn own result from dyndns service");
}
#endregion
}

"André Heuer" <aheuer@t-online.de> schrieb im Newsbeitrag
news:uaU$ND1qDH A.2480@TK2MSFTN GP10.phx.gbl...[color=blue]
> Hi,
>
> i want to write a .net class that can update my ip address at the dyndns
> service (http://www.dyndns.org).
>
> When I open the page
>
>[/color]
https://username:password@members.dy...re&wildcard=on[color=blue]
>
> i get the response
>
> nochg 80.146.122.175
>
> which means "No change". IP hasn´t changed. Fine.
>
> I wrote this code in my c# class:
>
> public void UpdateIP(IPAddr ess ip)
> {
> const string UPDATE_URL =
>[/color]
"https://<USER>:<PWD>@me mbers.dyndns.or g/nic/update?system=d yndns&hostname= <[color=blue]
> HOST>&myip=<IP> &wildcard=<WILD CARD>";
>
> string url = UPDATE_URL;
> url = url.Replace("<U SER>", mUsername);
> url = url.Replace("<P WD>", mPassword);
> url = url.Replace("<H OST>", mDomain);
> url = url.Replace("<I P>", ip.ToString());
> url = url.Replace("<W ILDCARD>", mWildcard ? "on" : "off");
>
> HttpWebRequest request = (HttpWebRequest )WebRequest.Cre ate(url);
>
> request.Headers .Add("Cache-control", "no-cache");
> request.Headers .Add("Pragma"," no-cache");
>
> HttpWebResponse response = (HttpWebRespons e)request.GetRe sponse();
> string text = new[/color]
StreamReader(re sponse.GetRespo nseStream()).Re adToEnd();[color=blue]
>
> }
>
> I get the following error on the line "HttpWebRespons e response =
> (HttpWebRespons e)request.GetRe sponse();":
>
> 'System.Net.Web Exception' in system.dll
> Remote Server returned an error (403) Unzulässig.
>
> What is the difference betwenn the browser and my code? Any ideas?
>
> Tia
>
> André Heuer
>
>[/color]