Blacklist/Whitelist links?
 

Recently I've been having a ton of problems with members using malicious links (like ipgrabbers) to grab other members' IP addresses. I'm thinking the best way to perhaps prevent this is to only allow the posting of certain links (youtube, imgur, gfycat, etc).

Does anybody know of a plugin, or way, that you can blacklist links (or ideally, utilize a whitelist of permitted links [to prevent anything from being posted outside of it])? Alternatively, is there a better way to deal with this?

The only way to prevent this from happening is by using a whitelist like you said. This goes for all hyperlinks and all embedded media. You'd have to hook into one of the postbit hooks and check the post contents for any URL's and replace them with something else.

Just keep in mind that you have to do this for signatures and private messages as well, and possibly a chatbox if you have one.

Which is exactly what I was thinking. It's just really unfortunate that this is even a problem to begin with. As far as you know, however, there's no simple plugin or something I'd be able to just pop into place and modify as necessary, is there?

I'm personally not aware of any plugin that does exactly what you described.

As Dave told, you can find this plugin in vB library.

Or from this thread https://vborg.vbsupport.ru/showthread.php?t=219968

you can do the same to change link to whatever you wanted.

Hey, thanks! I actually looks like I'll be paying to have this plugin idea custom made.