How to make you make a server/emulator from scratch?

[lorenzostolk]

My question is, how do people make an emulator for a game to make a private server from scratch.
Can someone link something with some resources or explain it.
I would like to make an emulator/private server for another 2D game.

I'm a programmer in Java and C++.

 

[bowser123467]

Lots of hard work. Most online games use encryption but if you can get a packet sniffer or man in the middle proxy that decrypts and spits out the data you can begin to figure out what each packet does. From there you will just have to slowly reconstruct the entire game.

 

[lorenzostolk]

Lots of hard work. Most online games use encryption but if you can get a packet sniffer or man in the middle proxy that decrypts and spits out the data you can begin to figure out what each packet does. From there you will just have to slowly reconstruct the entire game.

How to do it with a game where the server is not online anymore, and only got the client?

 

[Eric]

How to do it with a game where the server is not online anymore, and only got the client?

It would be fairly difficult, but you can piece the game together by reverse engineering the client. At that point though it may be secure (encrypted) and would require even more work. However, this is a MapleStory section and not a reverse engineering/programming section, so I'm going to have to close this.