u/Pidgetron

Hi all, just purchased my first home a few months ago and am very house poor at the moment.

I noticed the toilet was a bit smelly (more than it should be lol) and then found this underneath, and I believe it's occasionally dripping. Is this desperately in need of replacing, and if so, is this something I can do myself?

My current house DIY prerequisites are: replacing my tap and Frankensteining PVC pipes together.

Please be kind, and thanks for your help!!