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Coding a Webserver

by: Common Exploit
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Introduction



In this tutorial I am going to be describing how to build a basic web server application. To be more precise, an application that listens on a TCP/IP port, authenticates incoming connections and serves data to authenticated clients. The code examples given below were written in VB6. I have tried to pick a simple case study for this article, but with a little work you can add all sorts of whistles and bells once you have the basic theory.


The 'Log Server' case study.

I have a control called TRON. TRON sits beneath all the other controls in my toolkit with the sole purpose of accepting debugging data from controls above it and outputting that data in some way so I can view it. That might be direct to screen or console, or appended to a text file for later examination.

I also wanted my TRON control to provide data to a basic web server. This basic web server would serve debugging information to developers working on any software that includes the TRON control. My web server app would then allow me (and other developers) to telnet into the box and see debug information in real time. I also wanted multiple clients to be able to connect simultaneously and for connecting clients to be authenticated prior to receiving any debug information.


How does it work?

I used 2 MSWinsock controls, one called WSock to handle incoming requests on port 255 from clients wishing to view debug information and one called PLink for TRON to send debug information on port 1. The PLink Winsock control accepts data sent to it on port 1 from my TRON control and relays that information to each of the connected and authenticated clients. Of course your firewall should be set to disallow incoming connections on port 1, because the connections to PLINK are not authenticated. Data sent to a PLink socket simply adds itself to the buffer value in the Log Server, which is then relayed to authenticated clients.

For the internal communications on the local machine between TRON controls and the Log Server I could have used DDE (I'm showing my age here) or Dynamic(?) Data Exchange that provides an async methodology for communication between running programs. However my TRON control is in fact an ActiveX component and DDE does not work from within ActiveX.



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