implement shutdown

src/wolz.rs

@@ -1,7 +1,9 @@
-use std::net::UdpSocket;
+use std::{
+    io::Write,
+    net::{TcpStream, UdpSocket},
+};
 
 use crate::{
-    arp,
     config::Config,
     error::{WError, WResult},
     mac::Mac,
@@ -55,10 +57,18 @@ impl Wolz {
         Ok(())
     }
 
-    pub fn shut_down(&self, mac_or_nick: &str) -> WResult<()> {
+    // TODO: Fallback to full network scan if /proc/net/arp file lookup fails
+    fn shut_down(&self, mac_or_nick: &str) -> WResult<()> {
         let mac = self.config.get_mac(mac_or_nick)?;
-        let ip_from_arp = netif::find_local_networks_with_mac(mac)?;
-        todo!()
+        let ip = netif::find_ip_with_mac(mac)?;
+
+        println!("Sending shutdown signal to {}:21367", ip);
+        let mut stream = TcpStream::connect(format!("{}:21367", ip)).map_err(WError::TcpSocketBindError)?;
+        stream
+            .write("shutdown".as_bytes())
+            .map_err(WError::TcpSocketWriteError)?;
+
+        Ok(())
     }
 }
 
@@ -67,10 +77,13 @@ fn try_send_magic_bytes(magic_bytes: &[u8; 102], mac: &Mac, local_network: &Loca
     let broadcast_addr = format!("{}:9", local_network.subnet_broadcast);
     match send_magic_bytes(&magic_bytes, &send_addr, &broadcast_addr) {
         Ok(()) => {
-            println!("Sent magic pkt {} -> {} for Mac {}", send_addr, broadcast_addr, mac);
+            println!(
+                "Sent WoL magic packet {} -> {} for mac {}",
+                send_addr, broadcast_addr, mac
+            );
         }
         Err(e) => println!(
-            "Unable to send magic pkt {} -> {} for Mac {}, because {}",
+            "Unable to send WoL magic packet {} -> {} for mac {}, because {}",
             send_addr, broadcast_addr, mac, e
         ),
     }