fix: fixing revshell example and its routes

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

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, io::prelude::*, net::Ipv4Addr};
+use std::{collections::HashMap, net::Ipv4Addr};
 
 use anyhow::anyhow;
 use tokio::time::{interval, Duration};
@@ -9,12 +9,7 @@ use pcap_sys::packets::*;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    print!("Please enter the target IP (found with `docker-compose exec examples_revshell_server ip a`, e.x. 172.19.0.2): ");
-    std::io::stdout().flush()?;
-    let stdin = std::io::stdin();
-    let mut target = String::new();
-    stdin.read_line(&mut target)?;
-    let target = target.trim().parse::<Ipv4Addr>()?;
+    let target = std::env::args().skip(1).next().ok_or(anyhow!("could not get target IP"))?.parse::<Ipv4Addr>()?;
 
     let (ifname, src_mac, dst_mac, srcip) = {
         let socket = netlink::Socket::new()?;