fix: fixed weird issues with querying routes

this just involved a better understanding of the data
types provided by libnl and some refactoring to make querying
as a user of the libnl library easier

examples/reverse-shell/server/src/main.rs

@@ -1,3 +1,19 @@
-fn main() {
-    println!("Hello, world!");
+use std::net::UdpSocket;
+
+fn main() -> anyhow::Result<()> {
+    let input = UdpSocket::bind("0.0.0.0:54248")?;
+
+    loop {
+        let mut buf = [0u8; 4];
+
+        let Ok((amount, src)) = input.recv_from(&mut buf[..]) else { continue; };
+
+        if amount != 4 {
+            continue;
+        }
+
+        println!("Received packet: {}", i32::from_be_bytes(buf));
+
+        let Ok(_) = input.send_to(&buf, src) else { continue; };
+    }
 }