Simple_Http_Server - pwncollege

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Simple_Http_Server

Im currently working in the website pwncollege and one of the exercise is making a custom http server using assembly.

It was really fun to make and i learned a lot so i decided to add a lot of comments to make it as readable as posible and i hope i can help others starting too!

Functionality

As the name says, the functionality of this webserver is very simple but it catched ( i think ) all the important concepts if you are looking to learn assembly:

• “_start:” is the entry point for the binary and has all the core code.
• “parseRequest” is the second more important function, this function is going to check the type of the request (GET/POST) and return one or more elements depending on the type:
  • (GET): For this type of request, parseRequest is going to extract the path of the file that is being requested and return it. ( then _start: is going to read the content of the file and write it to the socket )
  • (POST): For this type of request, parseRequest is going to extract the path of the file that is being requested, get the value of the “Content-Length” header and save the post data. ( then _start: is going to write the post data content into the file specified in the request )
• There is also some functions as “utility” ( findStr, getLength…etc ). All this functions has a explanatory comment.

I must say that i’m ignoring (sometimes) the ABI conventions but, yeah wharever