As per my other message, I apologize if I have offended you, it certainly wasn't my intention, I was just trying to clarify the use of the raw IP API, as opposed to the higher level solution which wouldn't work for our simulator.
Yeah, it would be, but Rust's standard library doesn't provide any way to invoke syscalls. You either need to go through libc's syscall wrapper, or write Assembly. I used the former to get access to faster directory traversal: https://github.com/BurntSushi/walkdir/blob/ec33af7f9b25afefc... (The rest of that code in that module may be interesting to you, since the API for getdents is pretty interesting and very C-like. Buttoning it up behind a safe API that can never be misused took a bit of thinking.)
Besides, Rust's standard library, on Linux at least, currently requires libc anyway. So you're already going to be linking to it.
In any case, I don't see anything particularly interesting in that C code. It's just shuffling data around and using some C functions, all of which is pretty easy to do in Rust. With that said, I do agree that translating that code would be non-trivial for a Rust beginner and would require getting pretty comfy in the language first. You'd likely also have to redefine any structs that you need in Rust (or use a tool like `bindgen` to generate bindings to, e.g., netinet/udp.h for you). But still, as an experienced Rust programmer, I think that C example would be enough for me to tackle this particular problem. So this might just be a case of being unfamiliar with the language, which is totally fair. There are going to be far less resources for Rust when compared to C.