hagelslag

cool scanner <(= w =)>

Why

I have also made a Go version of this project, just because, it will probably have more features and actually be useful.

I wanted to practice some C and I've heard of scanners for Minecraft servers some time ago and decided to do something similar. I'm not following any guides or searching on how scanners (in general) work.

My idea with this project is to try and add as many features as I can just so I can try out things in C, this is just an educational project for me.

As I am not a C programmer, Im sure I am either not doing something the C way, or just being plain stupid. I am not following any standards, just solving my own problems, one of them being 'how the hell do I store 3.7 billion integers properly'.

The hagelslag name came from a friend, well, eating a Hagelslag.

Only Linux is supported.

How

hagelslag works by generating all possible IP addresses, all 4.3 billion of them, in a loop, checking if they are reserved then sending them to a thread pool for scanning.

Each thread will retrieve an amount of Tasks from the Queue and process these tasks.

A thread in a loop will block and for each task inside of it, it will execute the x_connect and x_scan functions of the specified scanner.

• http: send a GET request to that address. If successful (status code 2xx), it will read and add the response to the database, the response has a maximum size of 5 megabytes.

• minecraft: send a handshake request to that address. If successful, send a status request and read the response.

Installing

Install the mongoc driver libraries.

Run make in the project root. You can also pass flags to it, for example:

make SCANNER=MINECRAFT THREADS=16 DATABASE_URI=mongodb...

Use make clean after changing flags value, specially the SCANNER flag.

Ideas

• As of now, hagelslag will take ages to finish scanning just once, use non-blocking sockets, maybe use libevent or something similar.

• Maybe add bedrocks servers to the Minecraft scanner.

• More error handling.

• Spread logging properly, right now its either too spammy or too little information being logged on some levels.

• Remove this weird virus that keeps adding Frieren in the code.