It's kind of weird the previous topic was on this subject as well.
Anyway, I wrote a SOCKS4 proxy which seems to be working well for the most part. It seems though I am having trouble with websites with quite a bit of content. If I open up one of these web pages, it is like it never quite finishes loading. By the way, I configured Firefox 3.5 to use my server.
An example of a web page that does this is msdn.microsoft.com
My code has virtually no comments, but I know the problem has to be in the main() block in the loop. I think that firefox may be firing off the connection requests so fast my program can't handle it.
It's about 200 lines, but I'll include the whole thing, but where I think the problem lies is where I referred to earlier, the loop in my main block.
Also any vulnerabilities you see I would love hear. I know of one already. It has to do with recv when the client first connects, packet fragmentation and stuff. But other than that I'm all ears. Thanks!
Edit: I used MinGW (gcc 4.4) to compile this. I am on Windows.