nasc: Add SVCLOC and nzchk documentation

[DaniElectra]

NASC behaves similarly to the NAS/NASWII servers, so some information has been extracted from existing docs of those servers.

Special thanks to:

• https://github.com/WiiLink24/wfc-server/blob/main/nas/auth.go
• https://wiki.tockdom.com/wiki/Network_Protocol/Server#naswii.nintendowifi.net

[jonbarrow]

NASC behaves similarly to the NAS/NASWII servers

IIRC it's the exact same server (not the same physical server, but the same codebase). NASC stands for NAS-CTR

[DaniElectra]

Yeah that makes sense. Should I change this phrasing then?

This is the authentication server of the 3DS. It is the succesor of the NAS and NASWII servers on the Nintendo DS(i) and the Wii.

[jonbarrow]

Yeah that makes sense. Should I change this phrasing then?

This is the authentication server of the 3DS. It is the succesor of the NAS and NASWII servers on the Nintendo DS(i) and the Wii.

I would, yeah. It's also worth noting that this section:

A single endpoint (ac) is used for all requests. Other requests are redirected to http://www.nintendo.com.

Is also wrong. While games may officially only use /ac, other endpoints used by the Wii/DS do still exist and still work (at least partially)

For example the /pr endpoint, which checks for profanity, gives a proper response in NASC, and can be interacted with by making a custom request in NintendoClients

[DaniElectra]

For example the /pr endpoint, which checks for profanity, gives a proper response in NASC

oh! I had only tested the /download endpoint which didn't work, so I didn't try others

[jonbarrow]

oh! I had only tested the /download endpoint which didn't work, so I didn't try others

I can't actually get it to give me a response that makes sense, but it at least gives a response. Base on WiiLink it seems like there should be a 0 for every word, delimited by \t. But when I try sending multiple words I always just get back a single 0, even if it contains profanity

[DaniElectra]

I can't actually get it to give me a response that makes sense, but it at least gives a response. Base on WiiLink it seems like there should be a 0 for every word, delimited by \t. But when I try sending multiple words I always just get back a single 0, even if it contains profanity

I tested with the NAS and NASWII domains and it gives the same results. I sent a message on the WiiLink discord server to see if I can get an answer about this

[DaniElectra]

I think this should be good now then

[jonbarrow]

lgtm