commit 7167846faace5887a977d7a61f90894973967d2a
Author: slonkazoid <slonkazoid@slonk.ing>
Date:   Fri Dec 27 00:07:46 2024 +0300

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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+
+[[package]]
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+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "futures-util",
+ "macaddr",
+ "scc",
+ "tokio",
+ "tokio-util",
+ "tracing",
+ "tracing-subscriber",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a07461c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "wol-rebroadcast"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.5.23", features = ["derive"] }
+color-eyre = "0.6.3"
+futures-util = "0.3.31"
+macaddr = "1.0.1"
+scc = "2.2.6"
+tokio = { version = "1.42.0", features = ["rt-multi-thread", "macros", "signal", "net"] }
+tokio-util = "0.7.13"
+tracing = "0.1.41"
+tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..de0eb15
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,184 @@
+use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::sync::Arc;
+
+use clap::Parser;
+use color_eyre::eyre::{self, Context};
+use macaddr::MacAddr6;
+use scc::HashSet;
+use tokio::net::UdpSocket;
+use tokio::select;
+use tokio::task::JoinSet;
+use tokio_util::sync::CancellationToken;
+use tracing::field::{Empty, debug};
+use tracing::level_filters::LevelFilter;
+use tracing::{Instrument, Span, debug, error, info, info_span};
+use tracing_subscriber::EnvFilter;
+use tracing_subscriber::layer::SubscriberExt;
+use tracing_subscriber::util::SubscriberInitExt;
+
+const DEFAULT_LISTENERS: &[SocketAddr] = &[
+    SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 9),
+    SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 7),
+];
+
+const DEFAULT_DEST: SocketAddr = SocketAddr::new(IpAddr::V4(Ipv4Addr::BROADCAST), 9);
+
+const HEADER: [u8; 6] = [0xff, 0xff, 0xff, 0xff, 0xff, 0xff];
+
+#[derive(Parser)]
+struct Args {
+    #[arg(short, long, help = "Addresses to listen on", default_values_t=DEFAULT_LISTENERS)]
+    listener: Vec<SocketAddr>,
+    #[arg(short, long, help = "Address to shove packets into", default_value_t=DEFAULT_DEST)]
+    dest: SocketAddr,
+}
+
+async fn next(sock: &mut UdpSocket) -> eyre::Result<Option<(SocketAddr, MacAddr6, [u8; 102])>> {
+    let mut buf: [u8; 103] = [0; 103];
+
+    let (read, addr) = sock.recv_from(&mut buf).await.context("failed ro recv")?;
+    Span::current().record("addr", addr.to_string());
+
+    if read != 102 {
+        debug!("ignoring invalid size: {read}");
+        return Ok(None);
+    }
+
+    let packet: [u8; 102] = unsafe { buf[..102].try_into().unwrap_unchecked() };
+
+    if packet[..6] != HEADER {
+        debug!("ignoring packet with invalid header");
+        return Ok(None);
+    }
+
+    let mac_bytes: [u8; 6] = unsafe { packet[6..12].try_into().unwrap_unchecked() };
+    let mac = MacAddr6::from(mac_bytes);
+    Span::current().record("mac", mac.to_string());
+
+    if packet[12..].chunks(6).any(|chunk| chunk != mac_bytes) {
+        debug!("ignoring packet with non-matching addresses");
+        return Ok(None);
+    }
+
+    debug!("packet valid");
+
+    Ok(Some((addr, mac, packet)))
+}
+
+async fn listen(
+    addr: SocketAddr,
+    dest: SocketAddr,
+    ignore_next: Arc<HashSet<MacAddr6>>,
+    token: CancellationToken,
+) -> eyre::Result<()> {
+    let mut sock = UdpSocket::bind(addr)
+        .await
+        .with_context(|| format!("failed to bind to {addr}"))?;
+    info!("listening on {addr}");
+
+    loop {
+        let span = info_span!("next", addr = Empty, mac = Empty);
+        let ticked = select! {
+            v = next(&mut sock).instrument(span.clone()) => v,
+            _ = token.cancelled() => {
+                break;
+            }
+        };
+
+        match ticked {
+            Ok(Some((_addr, mac, packet))) => {
+                let res = async {
+                    // this is too aggressive
+                    if ignore_next.remove_async(&mac).await.is_some() {
+                        debug!("packet echoed already");
+                        return Ok(());
+                    }
+
+                    let out_sock = UdpSocket::bind((Ipv4Addr::UNSPECIFIED, 0))
+                        .await
+                        .context("failed to bind socket")?;
+                    if dest.ip() == IpAddr::V4(Ipv4Addr::BROADCAST) {
+                        debug("setting broadcast");
+                        out_sock.set_broadcast(true)?;
+                    }
+
+                    out_sock
+                        .send_to(&packet, dest)
+                        .await
+                        .context("failed to write to socket")?;
+
+                    while ignore_next.insert_async(mac).await.is_err() {}
+
+                    info!("bounced wol magic packet from peer");
+
+                    eyre::Ok(())
+                }
+                .instrument(span)
+                .await;
+
+                if let Err(err) = res {
+                    error!("error sending packet to {mac}: {err}");
+                }
+            }
+            Err(err) => {
+                error!("error while handling packet: {err}");
+            }
+            _ => {}
+        }
+    }
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> eyre::Result<()> {
+    color_eyre::install()?;
+
+    tracing_subscriber::registry()
+        .with(
+            EnvFilter::builder()
+                .with_default_directive(LevelFilter::INFO.into())
+                .from_env_lossy(),
+        )
+        .with(tracing_subscriber::fmt::layer())
+        .try_init()?;
+
+    let args = Args::parse();
+
+    let pinged = Default::default();
+
+    let mut set = JoinSet::new();
+    let token = CancellationToken::new();
+
+    for addr in args.listener.into_iter() {
+        set.spawn(listen(addr, args.dest, Arc::clone(&pinged), token.clone()));
+    }
+
+    drop(pinged);
+
+    let mut task = tokio::spawn(async move {
+        while let Some(res) = set.join_next().await {
+            res.context("failed to join task")?
+                .context("task exited with error")?;
+        }
+        eyre::Ok(())
+    });
+
+    loop {
+        select! {
+            r = tokio::signal::ctrl_c() => {
+                r?;
+                if !token.is_cancelled() {
+                    info!("cancelling");
+                    token.cancel();
+                }
+            },
+            t = &mut task => {
+                t??;
+                break;
+            }
+        }
+    }
+
+    Ok(())
+}