Web services question...

Manster

Hi, Can anyone tell me how a web service would get the calling computers IPAddress? I'm new to web services and I'm not sure where to look for this type of information. It's probably something really obvious that I'm unaware of. Thanks

Heath Stewart

Domain Name Services, or DNS. This is all handled by the TCP/IP stack on your machine. This is what resolves names like www.codeproject.com to IP addresses like 209.171.52.99.

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Manster

Heath, I looked at the Dns class, but I didn't see anything obvious that would help me find out the calling computers ip address of my web service. Is their a way to do this? Thanks

Heath Stewart

You can use Dns.GetHostByName (or the asynchronous BeginGetHostByName) to get the IP address, but you don't need to in most cases. When the proxy makes a request to the remote Web Services via its URL, the DNS client of your local machine will resolve the IP address, connect to the server, and make the request on the Web Service. This is all done internally - you do not need to resolve the IP address manually, just like you don't need to use the IP address in Internet Explorer and other Internet-ready applications.

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Manster

So all I need to do is add this code to my web service and this will get the calling programs ip address? string sHostName = Dns.GetHostName(); IPHostEntry ipEntry = Dns.GetHostByName( sHostName ); string sCallingAppName = ipEntry.HostName; Thanks

Heath Stewart

If you want to log the IP address of the machine making the request to your web service, all you need to do us is get Context.Request.UserHostAddress inside a method call in your web service (Context is a property inheritted from the WebService from which your web service derives).

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Manster

Thanks so much for your help, this is exactly what I needed. :)