chore: Release dkl version 1.1.0

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "dkl"
-version = "1.0.0"
+version = "1.1.0"
 edition = "2024"
 
 [profile.release]
@@ -13,25 +13,33 @@ codegen-units = 1
 [dependencies]
 async-compression = { version = "0.4.27", features = ["tokio", "zstd"] }
 base32 = "0.5.1"
+base64 = "0.22.1"
 bytes = "1.10.1"
 chrono = { version = "0.4.41", default-features = false, features = ["clock", "now"] }
 clap = { version = "4.5.40", features = ["derive", "env"] }
 clap_complete = { version = "4.5.54", features = ["unstable-dynamic"] }
 env_logger = "0.11.8"
 eyre = "0.6.12"
+fastrand = "2.3.0"
 futures = "0.3.31"
 futures-util = "0.3.31"
 glob = "0.3.2"
 hex = "0.4.3"
+human-units = "0.5.3"
 log = "0.4.27"
 lz4 = "1.28.1"
-nix = { version = "0.30.1", features = ["user"] }
+memchr = "2.8.0"
+nix = { version = "0.31.2", features = ["process", "signal", "user"] }
 openssl = "0.10.73"
 page_size = "0.6.0"
-reqwest = { version = "0.12.20", features = ["json", "stream", "native-tls"] }
+reqwest = { version = "0.13.1", features = ["json", "stream", "native-tls", "socks"], default-features = false }
+rpassword = "7.4.0"
+rust-argon2 = "3.0.0"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
 serde_yaml = "0.9.34"
+signal-hook = "0.4.4"
+tabled = "0.20.0"
 thiserror = "2.0.12"
 tokio = { version = "1.45.1", features = ["fs", "io-std", "macros", "process", "rt"] }
 

Dockerfile

@@ -1,4 +1,4 @@
-from mcluseau/rust:1.88.0 as build
+from mcluseau/rust:1.94.0 as build
 
 workdir /app
 copy . .
@@ -10,6 +10,6 @@ run \
  && find target/release -maxdepth 1 -type f -executable -exec cp -v {} /dist/ +
 
 # ------------------------------------------------------------------------
-from alpine:3.22
+from alpine:3.23
 copy --from=build /dist/ /bin/
 

release.sh

@@ -0,0 +1,17 @@
+set -ex
+tag=$(git describe --always)
+repo=novit.tech/direktil/dkl:$tag
+
+docker build --push --platform=linux/amd64,linux/arm64 . -t $repo
+
+publish() {
+    arch=$1
+    pf=$2
+
+    curl --user $(jq '.auths["novit.tech"].auth' ~/.docker/config.json -r |base64 -d) \
+        --upload-file <(docker run --rm --platform $pf $repo cat /bin/dkl) \
+        https://novit.tech/api/packages/direktil/generic/dkl/$tag/dkl.$arch
+}
+
+publish x86_64 linux/amd64
+publish arm64  linux/arm64

src/apply.rs

@@ -3,21 +3,61 @@ use log::info;
 use std::path::Path;
 use tokio::fs;
 
-pub async fn files(files: &[crate::File], root: &str) -> Result<()> {
+use crate::base64_decode;
+
+pub async fn files(files: &[crate::File], root: &str, dry_run: bool) -> Result<()> {
     for file in files {
         let path = chroot(root, &file.path);
         let path = Path::new(&path);
 
-        if let Some(parent) = path.parent() {
+        if !dry_run && let Some(parent) = path.parent() {
             fs::create_dir_all(parent).await?;
         }
 
         use crate::FileKind as K;
         match &file.kind {
-            K::Content(content) => fs::write(path, content.as_bytes()).await?,
-            K::Dir(true) => fs::create_dir(path).await?,
+            K::Content(content) => {
+                if dry_run {
+                    info!(
+                        "would create {} ({} bytes from content)",
+                        file.path,
+                        content.len()
+                    );
+                } else {
+                    fs::write(path, content.as_bytes()).await?;
+                }
+            }
+            K::Content64(content) => {
+                let content = base64_decode(content)?;
+                if dry_run {
+                    info!(
+                        "would create {} ({} bytes from content64)",
+                        file.path,
+                        content.len()
+                    );
+                } else {
+                    fs::write(path, content).await?
+                }
+            }
+            K::Dir(true) => {
+                if dry_run {
+                    info!("would create {} (directory)", file.path);
+                } else {
+                    fs::create_dir(path).await?;
+                }
+            }
             K::Dir(false) => {} // shouldn't happen, but semantic is to ignore
-            K::Symlink(tgt) => fs::symlink(tgt, path).await?,
+            K::Symlink(tgt) => {
+                if dry_run {
+                    info!("would create {} (symlink to {})", file.path, tgt);
+                } else {
+                    fs::symlink(tgt, path).await?;
+                }
+            }
+        }
+
+        if dry_run {
+            continue;
         }
 
         match file.kind {

src/bin/dkl.rs

@@ -1,6 +1,9 @@
 use clap::{CommandFactory, Parser, Subcommand};
 use eyre::{format_err, Result};
+use human_units::Duration;
 use log::{debug, error};
+use std::net::SocketAddr;
+use std::path::PathBuf;
 use tokio::fs;
 
 #[derive(Parser)]
@@ -22,6 +25,9 @@ enum Command {
         /// path prefix (aka chroot)
         #[arg(short = 'P', long, default_value = "/")]
         prefix: String,
+        /// don't really write files
+        #[arg(long)]
+        dry_run: bool,
     },
     Logger {
         /// Path where the logs are stored
@@ -33,6 +39,9 @@ enum Command {
         /// prefix log lines with time & stream
         #[arg(long)]
         with_prefix: bool,
+        /// exec command in this cgroup
+        #[arg(long)]
+        cgroup: Option<String>,
         command: String,
         args: Vec<String>,
     },
@@ -65,6 +74,34 @@ enum Command {
         #[arg(long, default_value = "/")]
         chroot: std::path::PathBuf,
     },
+    Proxy {
+        #[arg(long, short = 'l')]
+        listen: Vec<SocketAddr>,
+        targets: Vec<SocketAddr>,
+        /// target polling interval
+        #[arg(long, default_value = "30s")]
+        poll: Duration,
+        /// connect or check timeout
+        #[arg(long, default_value = "5s")]
+        timeout: Duration,
+    },
+
+    Cg {
+        #[command(subcommand)]
+        cmd: CgCmd,
+    },
+}
+
+#[derive(Subcommand)]
+enum CgCmd {
+    Ls {
+        #[arg(long)]
+        root: Option<PathBuf>,
+        #[arg(long, short = 'X')]
+        exclude: Vec<String>,
+        #[arg(long, short = 'C')]
+        cols: Option<String>,
+    },
 }
 
 #[tokio::main(flavor = "current_thread")]
@@ -84,14 +121,16 @@ async fn main() -> Result<()> {
             config,
             filters,
             prefix,
+            dry_run,
         } => {
             let filters = parse_globs(&filters)?;
-            apply_config(&config, &filters, &prefix).await
+            apply_config(&config, &filters, &prefix, dry_run).await
         }
         C::Logger {
             ref log_path,
             ref log_name,
             with_prefix,
+            cgroup,
             command,
             args,
         } => {
@@ -103,7 +142,7 @@ async fn main() -> Result<()> {
                 log_name,
                 with_prefix,
             }
-            .run(command, &args)
+            .run(cgroup, command, &args)
             .await
         }
         C::Log {
@@ -126,10 +165,37 @@ async fn main() -> Result<()> {
             .install(layer, version)
             .await
         }
+        C::Proxy {
+            listen,
+            targets,
+            poll,
+            timeout,
+        } => Ok(dkl::proxy::Proxy {
+            listen_addrs: listen,
+            targets,
+            poll: poll.into(),
+            timeout: timeout.into(),
+        }
+        .run()
+        .await
+        .map(|_| ())?),
+
+        C::Cg { cmd } => match cmd {
+            CgCmd::Ls {
+                root,
+                exclude,
+                cols,
+            } => Ok(dkl::cgroup::ls(root, &exclude, cols.as_deref()).await?),
+        },
     }
 }
 
-async fn apply_config(config_file: &str, filters: &[glob::Pattern], chroot: &str) -> Result<()> {
+async fn apply_config(
+    config_file: &str,
+    filters: &[glob::Pattern],
+    chroot: &str,
+    dry_run: bool,
+) -> Result<()> {
     let config = fs::read_to_string(config_file).await?;
     let config: dkl::Config = serde_yaml::from_str(&config)?;
 
@@ -141,7 +207,7 @@ async fn apply_config(config_file: &str, filters: &[glob::Pattern], chroot: &str
             .collect()
     };
 
-    dkl::apply::files(&files, chroot).await
+    dkl::apply::files(&files, chroot, dry_run).await
 }
 
 #[derive(Subcommand)]

src/bin/dls.rs

@@ -36,6 +36,10 @@ enum Command {
     },
     #[command(subcommand)]
     DlSet(DlSet),
+    /// hash a password
+    Hash {
+        salt: String,
+    },
 }
 
 #[derive(Subcommand)]
@@ -103,14 +107,16 @@ async fn main() -> eyre::Result<()> {
         .parse_default_env()
         .init();
 
-    let token = std::env::var("DLS_TOKEN").map_err(|_| format_err!("DLS_TOKEN should be set"))?;
-
-    let dls = dls::Client::new(cli.dls, token);
+    let dls = || {
+        let token = std::env::var("DLS_TOKEN").expect("DLS_TOKEN should be set");
+        dls::Client::new(cli.dls, token)
+    };
 
     use Command as C;
     match cli.command {
-        C::Clusters => write_json(&dls.clusters().await?),
+        C::Clusters => write_json(&dls().clusters().await?),
         C::Cluster { cluster, command } => {
+            let dls = dls();
             let cluster = dls.cluster(cluster);
 
             use ClusterCommand as CC;
@@ -155,8 +161,9 @@ async fn main() -> eyre::Result<()> {
                 }
             }
         }
-        C::Hosts => write_json(&dls.hosts().await?),
+        C::Hosts => write_json(&dls().hosts().await?),
         C::Host { out, host, asset } => {
+            let dls = dls();
             let host_name = host.clone();
             let host = dls.host(host);
             match asset {
@@ -171,7 +178,7 @@ async fn main() -> eyre::Result<()> {
         C::DlSet(set) => match set {
             DlSet::Sign { expiry, items } => {
                 let req = dls::DownloadSetReq { expiry, items };
-                let signed = dls.sign_dl_set(&req).await?;
+                let signed = dls().sign_dl_set(&req).await?;
                 println!("{signed}");
             }
             DlSet::Show { signed_set } => {
@@ -211,11 +218,19 @@ async fn main() -> eyre::Result<()> {
                 name,
                 asset,
             } => {
+                let dls = dls();
                 let stream = dls.fetch_dl_set(&signed_set, &kind, &name, &asset).await?;
                 let mut out = create_asset_file(out, &kind, &name, &asset).await?;
                 copy_stream(stream, &mut out).await?;
             }
         },
+        C::Hash { salt } => {
+            let salt = dkl::base64_decode(&salt)?;
+            let passphrase = rpassword::prompt_password("password to hash: ")?;
+            let hash = dls::store::hash_password(&salt, &passphrase)?;
+            println!("hash (hex):    {}", hex::encode(&hash));
+            println!("hash (base64): {}", dkl::base64_encode(&hash));
+        }
     };
 
     Ok(())

src/bootstrap.rs

@@ -2,7 +2,7 @@ use std::collections::BTreeMap as Map;
 
 pub const TAKE_ALL: i16 = -1;
 
-#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
 pub struct Config {
     pub anti_phishing_code: String,
 
@@ -42,21 +42,11 @@ impl Config {
     pub fn new(bootstrap_dev: String) -> Self {
         Self {
             anti_phishing_code: "Direktil<3".into(),
-            keymap: None,
-            modules: None,
-            resolv_conf: None,
-            vpns: Map::new(),
-            networks: vec![],
-            auths: vec![],
-            ssh: Default::default(),
-            pre_lvm_crypt: vec![],
-            lvm: vec![],
-            crypt: vec![],
-            signer_public_key: None,
             bootstrap: Bootstrap {
                 dev: bootstrap_dev,
-                seed: None,
+                ..Default::default()
             },
+            ..Default::default()
         }
     }
 }
@@ -88,6 +78,17 @@ pub struct NetworkInterface {
     pub udev: Option<UdevFilter>,
 }
 
+impl Default for NetworkInterface {
+    fn default() -> Self {
+        Self {
+            var: "iface".into(),
+            n: 1,
+            regexps: Vec::new(),
+            udev: Some(UdevFilter::Eq("INTERFACE".into(), "eth0".into())),
+        }
+    }
+}
+
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 pub struct SSHServer {
     pub listen: String,
@@ -104,7 +105,7 @@ impl Default for SSHServer {
 
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 pub struct LvmVG {
-    #[serde(alias = "vg")]
+    #[serde(rename = "vg", alias = "name")]
     pub name: String,
     pub pvs: LvmPV,
 
@@ -244,7 +245,7 @@ pub struct Raid {
     pub stripes: Option<u8>,
 }
 
-#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
+#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
 pub struct Bootstrap {
     pub dev: String,
     #[serde(skip_serializing_if = "Option::is_none")]

src/cgroup.rs

@@ -0,0 +1,381 @@
+use std::borrow::Cow;
+use std::fmt::Display;
+use std::path::{Path as StdPath, PathBuf};
+use std::rc::Rc;
+use std::str::FromStr;
+
+use crate::{fs, human::Human};
+
+pub const ROOT: &str = "/sys/fs/cgroup";
+
+pub async fn ls(
+    parent: Option<impl AsRef<StdPath>>,
+    exclude: &[String],
+    columns: Option<&str>,
+) -> fs::Result<()> {
+    let mut root = PathBuf::from(ROOT);
+    if let Some(parent) = parent {
+        root = root.join(parent);
+    }
+
+    let cols: [(&str, fn(&Cgroup) -> String); _] = [
+        ("wset", |cg| cg.memory.working_set().human()),
+        ("anon", |cg| cg.memory.stat.anon.human()),
+        ("min", |cg| cg.memory.min.human()),
+        ("low", |cg| cg.memory.low.human()),
+        ("high", |cg| cg.memory.high.human()),
+        ("max", |cg| cg.memory.max.human()),
+    ];
+    let cols = if let Some(columns) = columns {
+        (cols.into_iter())
+            .filter(|(n, _)| columns.split(',').any(|col| &col == n))
+            .collect()
+    } else {
+        cols.to_vec()
+    };
+
+    let mut table = tabled::builder::Builder::new();
+    table.push_record(["cgroup"].into_iter().chain(cols.iter().map(|(n, _)| *n)));
+
+    let mut todo = vec![(Cgroup::root(root).await?, vec![], true)];
+    while let Some((cg, p_lasts, last)) = todo.pop() {
+        let mut name = String::new();
+        for last in p_lasts.iter().skip(1) {
+            name.push_str(if *last { "   " } else { "|  " });
+        }
+        if !p_lasts.is_empty() {
+            name.push_str(if last { "`- " } else { "|- " });
+        }
+        name.push_str(&cg.name());
+
+        table.push_record([name].into_iter().chain(cols.iter().map(|(_, f)| f(&cg))));
+
+        let mut p_lasts = p_lasts.clone();
+        p_lasts.push(last);
+
+        let mut children = cg.read_children().await?;
+        children.sort();
+        todo.extend(
+            (children.into_iter().rev())
+                .filter(|c| !exclude.iter().any(|x| x == &c.path.full_name()))
+                .enumerate()
+                .map(|(i, child)| (child, p_lasts.clone(), i == 0)),
+        );
+    }
+
+    use tabled::settings::{
+        object::{Column, Row},
+        Alignment, Modify,
+    };
+    let mut table = table.build();
+    table.with(tabled::settings::Style::psql());
+    table.with(Alignment::right());
+    table.with(Modify::list(Column::from(0), Alignment::left()));
+    table.with(Modify::list(Row::from(0), Alignment::left()));
+
+    println!("{}", table);
+
+    Ok(())
+}
+
+pub struct Cgroup {
+    path: Rc<Path>,
+    children: Vec<PathBuf>,
+    memory: Memory,
+}
+
+impl Cgroup {
+    pub async fn root(path: impl AsRef<StdPath>) -> fs::Result<Self> {
+        let path = path.as_ref();
+        Self::read(Path::root(path), path).await
+    }
+
+    async fn read(cg_path: Rc<Path>, path: impl AsRef<StdPath>) -> fs::Result<Self> {
+        let path = path.as_ref();
+
+        use fs::Error as E;
+
+        let mut rd = fs::read_dir(path).await?;
+
+        let mut cg = Self {
+            path: cg_path,
+            children: Vec::new(),
+            memory: Memory::default(),
+        };
+
+        while let Some(entry) = (rd.next_entry().await).map_err(|e| E::ReadDir(path.into(), e))? {
+            let path = entry.path();
+
+            let Some(file_name) = path.file_name() else {
+                continue;
+            };
+
+            if (entry.file_type().await)
+                .map_err(|e| E::Stat(path.clone(), e))?
+                .is_dir()
+            {
+                cg.children.push(file_name.into());
+                continue;
+            }
+
+            let file_name = file_name.as_encoded_bytes();
+            let Some(idx) = file_name.iter().position(|b| *b == b'.') else {
+                continue;
+            };
+
+            let (controller, param) = file_name.split_at(idx);
+            let param = &param[1..];
+
+            match controller {
+                b"memory" => match param {
+                    b"current" => cg.memory.current = read_parse(path).await?,
+                    b"low" => cg.memory.low = read_parse(path).await?,
+                    b"high" => cg.memory.high = read_parse(path).await?,
+                    b"min" => cg.memory.min = read_parse(path).await?,
+                    b"max" => cg.memory.max = read_parse(path).await?,
+                    b"stat" => cg.memory.stat.read_from(path).await?,
+                    _ => {}
+                },
+                _ => {}
+            }
+        }
+
+        Ok(cg)
+    }
+
+    async fn read_children(&self) -> fs::Result<Vec<Self>> {
+        let mut r = Vec::with_capacity(self.children.len());
+
+        let mut dir = PathBuf::from(self.path.as_ref());
+
+        for child_name in &self.children {
+            dir.push(child_name);
+            let child_path = Path::Child(self.path.clone(), child_name.into());
+            r.push(Self::read(child_path.into(), &dir).await?);
+            dir.pop();
+        }
+
+        Ok(r)
+    }
+
+    pub fn name(&self) -> Cow<'_, str> {
+        self.path.name()
+    }
+
+    pub fn full_name(&self) -> String {
+        self.path.full_name()
+    }
+
+    pub fn children(&self) -> impl Iterator<Item = &StdPath> {
+        self.children.iter().map(|n| n.as_path())
+    }
+
+    pub async fn read_child(&self, name: impl AsRef<StdPath>) -> fs::Result<Self> {
+        let name = name.as_ref();
+        let mut dir = PathBuf::from(self.path.as_ref());
+        dir.push(name);
+        Self::read(self.path.child(name), &dir).await
+    }
+
+    pub async fn write_param(
+        &self,
+        name: impl AsRef<StdPath>,
+        value: impl AsRef<[u8]>,
+    ) -> fs::Result<()> {
+        let cg_dir = PathBuf::from(self.path.as_ref());
+        fs::write(cg_dir.join(name), value).await
+    }
+}
+
+impl PartialEq for Cgroup {
+    fn eq(&self, o: &Self) -> bool {
+        &self.path == &o.path
+    }
+}
+impl Eq for Cgroup {}
+
+impl Ord for Cgroup {
+    fn cmp(&self, o: &Self) -> std::cmp::Ordering {
+        self.path.cmp(&o.path)
+    }
+}
+impl PartialOrd for Cgroup {
+    fn partial_cmp(&self, o: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(o))
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+enum Path {
+    Root(PathBuf),
+    Child(Rc<Path>, PathBuf),
+}
+
+impl Path {
+    fn name(&self) -> Cow<'_, str> {
+        match self {
+            Self::Root(_) => "/".into(),
+            Self::Child(_, n) => n.to_string_lossy(),
+        }
+    }
+
+    fn full_name(&self) -> String {
+        use Path::*;
+        match self {
+            Root(_) => "/".into(),
+            Child(parent, _) => match parent.as_ref() {
+                Root(_) => self.name().into(),
+                Child(_, _) => format!("{}/{}", parent.full_name(), self.name()),
+            },
+        }
+    }
+
+    fn depth(&self) -> usize {
+        use Path::*;
+        match self {
+            Root(_) => 0,
+            Child(p, _) => 1 + p.depth(),
+        }
+    }
+
+    fn root(dir: impl Into<PathBuf>) -> Rc<Self> {
+        Rc::new(Self::Root(dir.into()))
+    }
+
+    fn child(self: &Rc<Self>, name: impl Into<PathBuf>) -> Rc<Self> {
+        Rc::new(Self::Child(self.clone(), name.into()))
+    }
+}
+
+impl From<&Path> for PathBuf {
+    fn from(mut p: &Path) -> Self {
+        let mut stack = Vec::with_capacity(p.depth() + 1);
+        loop {
+            match p {
+                Path::Root(root_path) => {
+                    stack.push(root_path);
+                    break;
+                }
+                Path::Child(parent, n) => {
+                    stack.push(n);
+                    p = parent;
+                }
+            }
+        }
+
+        let len = stack.iter().map(|p| p.as_os_str().len() + 1).sum::<usize>() - 1;
+
+        let mut buf = PathBuf::with_capacity(len);
+        buf.extend(stack.into_iter().rev());
+        buf
+    }
+}
+
+#[test]
+fn test_path_to_pathbuf() {
+    let root = Path::root("/a/b");
+    let c1 = root.child("c1");
+    let c1_1 = c1.child("c1-1");
+
+    assert_eq!(PathBuf::from("/a/b/c1"), PathBuf::from(c1.as_ref()));
+    assert_eq!(PathBuf::from("/a/b/c1/c1-1"), PathBuf::from(c1_1.as_ref()));
+}
+
+#[derive(Default)]
+struct Memory {
+    current: Option<u64>,
+    low: Option<u64>,
+    high: Option<Max>,
+    min: Option<u64>,
+    max: Option<Max>,
+    stat: MemoryStat,
+}
+
+impl Memory {
+    /// working set as defined by cAdvisor
+    /// (https://github.com/google/cadvisor/blob/e1ccfa9b4cf2e17d74e0f5526b6487b74b704503/container/libcontainer/handler.go#L853-L862)
+    fn working_set(&self) -> Option<u64> {
+        let cur = self.current?;
+        let inactive = self.stat.inactive_file?;
+        (inactive <= cur).then(|| cur - inactive)
+    }
+}
+
+#[derive(Default)]
+struct MemoryStat {
+    anon: Option<u64>,
+    file: Option<u64>,
+    kernel: Option<u64>,
+    kernel_stack: Option<u64>,
+    pagetables: Option<u64>,
+    shmem: Option<u64>,
+    inactive_file: Option<u64>,
+}
+
+enum Max {
+    Num(u64),
+    Max,
+}
+
+impl Display for Max {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Num(n) => write!(f, "{n}"),
+            Self::Max => f.write_str("max"),
+        }
+    }
+}
+
+impl Human for Max {
+    fn human(&self) -> String {
+        match self {
+            Self::Num(n) => n.human(),
+            Self::Max => "+∞".into(),
+        }
+    }
+}
+
+impl FromStr for Max {
+    type Err = std::num::ParseIntError;
+    fn from_str(s: &str) -> std::result::Result<Self, <Self as FromStr>::Err> {
+        Ok(match s {
+            "max" => Self::Max,
+            s => Self::Num(s.parse()?),
+        })
+    }
+}
+
+async fn read_parse<T: FromStr>(path: impl AsRef<StdPath>) -> fs::Result<Option<T>>
+where
+    T::Err: Display,
+{
+    let path = path.as_ref();
+
+    (fs::read_to_string(path).await?)
+        .trim_ascii()
+        .parse()
+        .map_err(|e| fs::Error::Other(path.into(), format!("parse failed: {e}")))
+        .map(|v| Some(v))
+}
+
+impl MemoryStat {
+    async fn read_from(&mut self, path: impl AsRef<StdPath>) -> fs::Result<()> {
+        for line in (fs::read_to_string(path).await?).lines() {
+            let Some((key, value)) = line.split_once(' ') else {
+                continue;
+            };
+            let value = value.parse::<u64>().ok();
+            match key {
+                "anon" => self.anon = value,
+                "file" => self.file = value,
+                "kernel" => self.kernel = value,
+                "kernel_stack" => self.kernel_stack = value,
+                "pagetables" => self.pagetables = value,
+                "shmem" => self.shmem = value,
+                "inactive_file" => self.inactive_file = value,
+                _ => {}
+            }
+        }
+        Ok(())
+    }
+}

src/dls.rs

@@ -5,7 +5,8 @@ use reqwest::Method;
 use std::collections::BTreeMap as Map;
 use std::fmt::Display;
 use std::net::IpAddr;
-use std::time::Duration;
+
+pub mod store;
 
 pub struct Client {
     base_url: String,
@@ -160,6 +161,32 @@ impl<'t> Host<'t> {
     }
 }
 
+#[derive(Default, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "PascalCase")]
+pub struct Config {
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
+    pub clusters: Vec<ClusterConfig>,
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
+    pub hosts: Vec<HostConfig>,
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
+    pub host_templates: Vec<HostConfig>,
+    #[serde(default, rename = "SSLConfig")]
+    pub ssl_config: String,
+    #[serde(default, deserialize_with = "deserialize_null_as_default")]
+    pub extra_ca_certs: Map<String, String>,
+}
+
+// compensate for go's encoder pitfalls
+use serde::{Deserialize, Deserializer};
+fn deserialize_null_as_default<'de, D, T>(deserializer: D) -> std::result::Result<T, D::Error>
+where
+    T: Default + Deserialize<'de>,
+    D: Deserializer<'de>,
+{
+    let opt = Option::deserialize(deserializer)?;
+    Ok(opt.unwrap_or_default())
+}
+
 #[derive(serde::Deserialize, serde::Serialize)]
 #[serde(rename_all = "PascalCase")]
 pub struct ClusterConfig {
@@ -172,15 +199,15 @@ pub struct ClusterConfig {
 #[serde(rename_all = "PascalCase")]
 pub struct HostConfig {
     pub name: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub cluster_name: Option<String>,
 
     #[serde(rename = "IPs")]
     pub ips: Vec<IpAddr>,
 
-    #[serde(skip_serializing_if = "Map::is_empty")]
+    #[serde(default, skip_serializing_if = "Map::is_empty")]
     pub labels: Map<String, String>,
-    #[serde(skip_serializing_if = "Map::is_empty")]
+    #[serde(default, skip_serializing_if = "Map::is_empty")]
     pub annotations: Map<String, String>,
 
     #[serde(rename = "IPXE", skip_serializing_if = "Option::is_none")]
@@ -190,10 +217,13 @@ pub struct HostConfig {
     pub kernel: String,
     pub versions: Map<String, String>,
 
+    /// initrd config template
     pub bootstrap_config: String,
+    /// files to add to the final initrd config, with rendering
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
     pub initrd_files: Vec<crate::File>,
 
+    /// system config template
     pub config: String,
 }
 
@@ -306,50 +336,3 @@ pub enum Error {
     #[error("response parsing failed: {0}")]
     Parse(serde_json::Error),
 }
-
-#[derive(serde::Serialize, serde::Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum File {
-    Static(crate::File),
-    Gen { path: String, from: ContentGen },
-}
-
-#[derive(serde::Serialize, serde::Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum ContentGen {
-    CaCrt(CaRef),
-    TlsKey(TlsRef),
-    TlsCrt {
-        key: TlsRef,
-        ca: CaRef,
-        profile: CertProfile,
-    },
-}
-
-#[derive(serde::Serialize, serde::Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum CaRef {
-    Global(String),
-    Cluster(String, String),
-}
-
-#[derive(serde::Serialize, serde::Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum TlsRef {
-    Cluster(String, String),
-    Host(String, String),
-}
-
-#[derive(serde::Serialize, serde::Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum CertProfile {
-    Client,
-    Server,
-    /// basicaly Client+Server
-    Peer,
-    Kube {
-        user: String,
-        group: String,
-        duration: Duration,
-    },
-}

src/dls/store.rs

@@ -0,0 +1,17 @@
+pub fn hash_password(salt: &[u8], passphrase: &str) -> argon2::Result<[u8; 32]> {
+    let hash = argon2::hash_raw(
+        passphrase.as_bytes(),
+        salt,
+        &argon2::Config {
+            variant: argon2::Variant::Argon2id,
+            hash_length: 32,
+            time_cost: 1,
+            mem_cost: 65536,
+            thread_mode: argon2::ThreadMode::Parallel,
+            lanes: 4,
+            ..Default::default()
+        },
+    )?;
+
+    unsafe { Ok(hash.try_into().unwrap_unchecked()) }
+}

src/dynlay.rs

@@ -1,4 +1,4 @@
-use eyre::{format_err, Result};
+use eyre::{Result, format_err};
 use log::{debug, error, info, warn};
 use std::path::PathBuf;
 use tokio::{fs, io::AsyncWriteExt, process::Command};

src/fs.rs

@@ -1,9 +1,53 @@
-use eyre::Result;
 use std::fs::Metadata;
-use std::path::PathBuf;
-use tokio::fs::read_dir;
+use std::path::{Path, PathBuf};
+use tokio::fs;
 use tokio::sync::mpsc;
 
+pub type Result<T> = std::result::Result<T, Error>;
+
+pub use tokio::fs::ReadDir;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("{0}: read dir: {1}")]
+    ReadDir(PathBuf, std::io::Error),
+    #[error("{0}: exists: {1}")]
+    Exists(PathBuf, std::io::Error),
+    #[error("{0}: read: {1}")]
+    Read(PathBuf, std::io::Error),
+    #[error("{0}: stat: {1}")]
+    Stat(PathBuf, std::io::Error),
+    #[error("{0}: create dir: {1}")]
+    CreateDir(PathBuf, std::io::Error),
+    #[error("{0}: write: {1}")]
+    Write(PathBuf, std::io::Error),
+    #[error("{0}: remove file: {1}")]
+    RemoveFile(PathBuf, std::io::Error),
+    #[error("{0}: symlink: {1}")]
+    Symlink(PathBuf, std::io::Error),
+    #[error("{0}: {1}")]
+    Other(PathBuf, String),
+}
+
+macro_rules! wrap_path {
+    ($fn:ident $( ( $( $pname:ident : $ptype:ty ),* ) )? -> $result:ty, $err:ident) => {
+        pub async fn $fn(path: impl AsRef<Path>$($(, $pname: $ptype)*)?) -> Result<$result> {
+            let path = path.as_ref();
+            fs::$fn(path $($(, $pname)*)?).await.map_err(|e| Error::$err(path.into(), e))
+        }
+    };
+}
+
+wrap_path!(read_dir -> ReadDir, ReadDir);
+wrap_path!(try_exists -> bool, Exists);
+wrap_path!(read -> Vec<u8>, Read);
+wrap_path!(read_to_string -> String, Read);
+wrap_path!(create_dir -> (), CreateDir);
+wrap_path!(create_dir_all -> (), CreateDir);
+wrap_path!(remove_file -> (), RemoveFile);
+wrap_path!(symlink(link_src: impl AsRef<Path>) -> (), Symlink);
+wrap_path!(write(content: impl AsRef<[u8]>) -> (), Write);
+
 pub fn spawn_walk_dir(
     dir: impl Into<PathBuf> + Send + 'static,
 ) -> mpsc::Receiver<Result<(PathBuf, Metadata)>> {
@@ -24,7 +68,7 @@ pub async fn walk_dir(dir: impl Into<PathBuf>, tx: mpsc::Sender<Result<(PathBuf,
         let entry = match rd.next_entry().await {
             Ok(v) => v,
             Err(e) => {
-                if tx.send(Err(e.into())).await.is_err() {
+                if tx.send(Err(Error::ReadDir(dir.clone(), e))).await.is_err() {
                     return;
                 }
                 todo.pop_front(); // skip dir on error

src/human.rs

@@ -0,0 +1,35 @@
+use human_units::FormatSize;
+use std::fmt::{Display, Formatter, Result};
+
+pub trait Human {
+    fn human(&self) -> String;
+}
+
+pub struct Quantity(u64);
+
+impl Display for Quantity {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+        self.0.format_size().fmt(f)
+    }
+}
+
+impl Human for Quantity {
+    fn human(&self) -> String {
+        self.to_string()
+    }
+}
+
+impl Human for u64 {
+    fn human(&self) -> String {
+        self.format_size().to_string()
+    }
+}
+
+impl<T: Human> Human for Option<T> {
+    fn human(&self) -> String {
+        match self {
+            Some(h) => h.human(),
+            None => "◌".to_string(),
+        }
+    }
+}

src/lib.rs

@@ -1,9 +1,13 @@
 pub mod apply;
 pub mod bootstrap;
+pub mod cgroup;
 pub mod dls;
 pub mod dynlay;
 pub mod fs;
+pub mod human;
 pub mod logger;
+pub mod proxy;
+pub mod rc;
 
 #[derive(Debug, Default, serde::Deserialize, serde::Serialize)]
 pub struct Config {
@@ -52,7 +56,7 @@ pub struct User {
     pub gid: Option<u32>,
 }
 
-#[derive(Debug, serde::Deserialize, serde::Serialize)]
+#[derive(Debug, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
 pub struct File {
     pub path: String,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -61,10 +65,32 @@ pub struct File {
     pub kind: FileKind,
 }
 
-#[derive(Debug, serde::Deserialize, serde::Serialize)]
-#[serde(rename_all = "snake_case")]
+#[derive(Debug, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "lowercase")]
 pub enum FileKind {
     Content(String),
+    Content64(String),
     Symlink(String),
     Dir(bool),
 }
+
+// ------------------------------------------------------------------------
+
+impl Config {
+    pub fn has_file(&self, path: &str) -> bool {
+        self.files.iter().any(|f| f.path == path)
+    }
+    pub fn file(&self, path: &str) -> Option<&File> {
+        self.files.iter().find(|f| f.path == path)
+    }
+}
+
+pub fn base64_decode(s: &str) -> Result<Vec<u8>, base64::DecodeError> {
+    use base64::{Engine as _, prelude::BASE64_STANDARD_NO_PAD as B64};
+    B64.decode(s.trim_end_matches('='))
+}
+
+pub fn base64_encode(b: &[u8]) -> String {
+    use base64::{Engine as _, prelude::BASE64_STANDARD as B64};
+    B64.encode(b)
+}

src/logger.rs

@@ -5,13 +5,15 @@ use log::{debug, error, warn};
 use std::path::{Path, PathBuf};
 use std::process::Stdio;
 use tokio::{
-    fs::{self, File},
+    fs::File,
     io::{self, AsyncBufReadExt, AsyncRead, AsyncWrite, AsyncWriteExt, BufReader, BufWriter},
     process,
     sync::mpsc,
     time::{sleep, Duration},
 };
 
+use crate::{cgroup, fs};
+
 pub type Timestamp = chrono::DateTime<Utc>;
 
 const TS_FORMAT: &str = "%Y%m%d_%H";
@@ -27,7 +29,7 @@ pub struct Logger<'t> {
 }
 
 impl<'t> Logger<'t> {
-    pub async fn run(&self, command: &str, args: &[String]) -> Result<()> {
+    pub async fn run(&self, cgroup: Option<String>, command: &str, args: &[String]) -> Result<()> {
         // make sure we can at least open the log before starting the command
         let archives_path = &format!("{path}/archives", path = self.log_path);
         (fs::create_dir_all(archives_path).await)
@@ -45,20 +47,42 @@ impl<'t> Logger<'t> {
         ));
 
         // start the command
-        let mut child = process::Command::new(command)
-            .args(args)
-            .stdout(Stdio::piped())
-            .stderr(Stdio::piped())
-            .spawn()?;
+        let mut cmd = process::Command::new(command);
+        cmd.args(args).stdout(Stdio::piped()).stderr(Stdio::piped());
+        if let Some(cgroup) = cgroup.as_deref() {
+            let mut cg_path = PathBuf::from(cgroup::ROOT);
+            cg_path.push(cgroup);
+            cg_path.push(self.log_name);
 
-        let (tx, mut rx) = mpsc::unbounded_channel();
+            use std::io::ErrorKind as K;
+            match tokio::fs::create_dir(&cg_path).await {
+                Ok(_) => debug!("created dir {}", cg_path.display()),
+                Err(e) if e.kind() == K::AlreadyExists => {
+                    debug!("existing dir {}", cg_path.display())
+                }
+                Err(e) => return Err(fs::Error::CreateDir(cg_path, e).into()),
+            }
+
+            let procs_file = cg_path.join("cgroup.procs");
+            debug!("procs file {}", procs_file.display());
+            fs::write(&procs_file, b"0").await?;
+        }
+
+        let mut child = cmd.spawn().map_err(|e| format_err!("exec failed: {e}"))?;
+
+        let (tx, mut rx) = mpsc::channel(8);
 
         tokio::spawn(copy("stdout", child.stdout.take().unwrap(), tx.clone()));
         tokio::spawn(copy("stderr", child.stderr.take().unwrap(), tx));
 
-        let mut flush_ticker = tokio::time::interval(FLUSH_INTERVAL);
+        // forward signals
+        if let Some(child_pid) = child.id() {
+            forward_signals_to(child_pid as i32);
+        }
 
         // handle output
+        let mut flush_ticker = tokio::time::interval(FLUSH_INTERVAL);
+
         loop {
             tokio::select!(
                 r = rx.recv() => {
@@ -78,13 +102,14 @@ impl<'t> Logger<'t> {
             );
         }
 
+        let status = child.wait().await?;
+
         // finalize
         while let Err(e) = current_log.flush().await {
             error!("final log flush failed: {e}");
             sleep(WRITE_RETRY_DELAY).await;
         }
 
-        let status = child.wait().await?;
         std::process::exit(status.code().unwrap_or(-1));
     }
 
@@ -112,6 +137,9 @@ impl<'t> Logger<'t> {
         }
 
         out.write_all(&log.line).await?;
+        if log.line.last() != Some(&b'\n') {
+            out.write("↵\n".as_bytes()).await?;
+        }
         Ok(())
     }
 
@@ -125,29 +153,28 @@ impl<'t> Logger<'t> {
             .open(log_file)
             .await?;
 
-        let link_src = &format!(
-            "{path}/{name}.log",
-            path = self.log_path,
-            name = self.log_name
-        );
-        let link_tgt = log_file
-            .strip_prefix(&format!("{}/", self.log_path))
-            .unwrap_or(log_file);
+        let link_src = &PathBuf::from(self.log_path)
+            .join(self.log_name)
+            .with_added_extension("log");
+        let link_tgt = &self.archive_rel_path(ts);
 
         let _ = fs::remove_file(link_src).await;
-        fs::symlink(link_tgt, link_src)
-            .await
-            .map_err(|e| format_err!("symlink {link_src} -> {link_tgt} failed: {e}",))?;
+        fs::symlink(link_tgt, link_src).await.map_err(|e| {
+            format_err!(
+                "symlink {s} -> {t} failed: {e}",
+                s = link_src.display(),
+                t = link_tgt.display()
+            )
+        })?;
 
         Ok(file)
     }
 
-    fn archive_path(&self, ts: Timestamp) -> String {
-        format!(
-            "{path}/archives/{file}",
-            path = self.log_path,
-            file = self.archive_file(ts)
-        )
+    fn archive_path(&self, ts: Timestamp) -> PathBuf {
+        PathBuf::from(self.log_path).join(self.archive_rel_path(ts))
+    }
+    fn archive_rel_path(&self, ts: Timestamp) -> PathBuf {
+        PathBuf::from("archives").join(self.archive_file(ts))
     }
     fn archive_file(&self, ts: Timestamp) -> String {
         format!(
@@ -158,38 +185,100 @@ impl<'t> Logger<'t> {
     }
 }
 
+fn forward_signals_to(pid: i32) {
+    use nix::{
+        sys::signal::{kill, Signal},
+        unistd::Pid,
+    };
+    use signal_hook::{consts::*, low_level::register};
+
+    debug!("forwarding signals to pid {pid}");
+
+    let pid = Pid::from_raw(pid);
+    let signals = [
+        SIGHUP, SIGINT, SIGQUIT, SIGTERM, SIGUSR1, SIGUSR2, SIGPIPE, SIGALRM,
+    ];
+
+    for sig in signals {
+        let Ok(signal) = Signal::try_from(sig) else {
+            continue;
+        };
+        unsafe {
+            register(sig, move || {
+                debug!("forwarding {signal} to {pid}");
+                let _ = kill(pid, signal);
+            })
+            .ok();
+        }
+    }
+}
+
 struct LogItem {
     stream_name: &'static str,
     ts: chrono::DateTime<chrono::Utc>,
     line: Vec<u8>,
 }
 
-async fn copy(
-    stream_name: &'static str,
-    out: impl AsyncRead + Unpin,
-    tx: mpsc::UnboundedSender<LogItem>,
-) {
-    let mut out = BufReader::new(out);
+async fn copy(stream_name: &'static str, out: impl AsyncRead + Unpin, tx: mpsc::Sender<LogItem>) {
     let buf_size = page_size::get();
-    loop {
+    let mut out = BufReader::with_capacity(buf_size, out);
     let mut line = Vec::with_capacity(buf_size);
-        if let Err(e) = out.read_until(b'\n', &mut line).await {
-            warn!("read {stream_name} failed: {e}");
-            return;
-        }
-        if line.is_empty() {
-            break;
-        }
 
+    macro_rules! send_line {
+        () => {
             let log = LogItem {
                 stream_name,
                 ts: chrono::Utc::now(),
-            line,
+                line: line.clone(),
             };
-        if let Err(e) = tx.send(log) {
+            if let Err(e) = tx.send(log).await {
                 warn!("send line failed: {e}");
                 return;
             }
+            line.clear();
+        };
+    }
+
+    loop {
+        let Ok(buf) = (out.fill_buf())
+            .await
+            .inspect_err(|e| warn!("read {stream_name} failed: {e}"))
+        else {
+            break;
+        };
+
+        if buf.is_empty() {
+            break;
+        }
+
+        let remaining = buf_size - line.len();
+
+        if let Some(pos) = memchr::memchr(b'\n', buf) {
+            let len = pos + 1;
+            let mut buf = &buf[..len];
+
+            if len > remaining {
+                line.extend_from_slice(&buf[..remaining]);
+                send_line!();
+                buf = &buf[remaining..];
+            }
+
+            line.extend_from_slice(buf);
+            out.consume(len);
+            send_line!();
+        } else if buf.len() > remaining {
+            line.extend_from_slice(&buf[..remaining]);
+            out.consume(remaining);
+            send_line!();
+        } else {
+            line.extend_from_slice(buf);
+            let len = buf.len();
+            out.consume(len);
+        }
+    }
+
+    if !line.is_empty() {
+        send_line!();
     }
 }
 
@@ -250,14 +339,14 @@ async fn compress(path: impl AsRef<Path>) {
         let mut out = ZstdEncoder::new(out);
         async {
             tokio::io::copy(&mut input, &mut out).await?;
-            out.flush().await
+            out.shutdown().await
         }
         .await
         .map_err(|e| format_err!("compression of {path_str} failed: {e}"))?;
 
         fs::remove_file(path)
             .await
-            .map_err(|e| format_err!("remove {path_str} failed: {e}"))
+            .map_err(|e| format_err!("remove {path_str} failed: {e}"))
     }
     .await;
 
@@ -267,19 +356,22 @@ async fn compress(path: impl AsRef<Path>) {
 }
 
 pub fn parse_ts(ts: &str) -> std::result::Result<Timestamp, chrono::ParseError> {
-    let dt =
-        chrono::NaiveDateTime::parse_from_str(&format!("{ts}0000"), &format!("{TS_FORMAT}%M%S"))?;
+    let format = &format!("{TS_FORMAT}%M%S");
+    let full_ts = &format!("{ts}0000");
+    let dt = chrono::NaiveDateTime::parse_from_str(full_ts, format)?;
     Ok(Timestamp::from_naive_utc_and_offset(dt, Utc))
 }
 
-pub async fn log_files(log_path: &str, log_name: &str) -> std::io::Result<Vec<LogFile>> {
+pub async fn log_files(log_path: &str, log_name: &str) -> fs::Result<Vec<LogFile>> {
     let mut dir = PathBuf::from(log_path);
     dir.push("archives");
 
     let mut entries = Vec::new();
-    let mut read_dir = fs::read_dir(dir).await?;
+    let mut read_dir = fs::read_dir(&dir).await?;
 
-    while let Some(entry) = read_dir.next_entry().await? {
+    while let Some(entry) =
+        (read_dir.next_entry().await).map_err(|e| fs::Error::ReadDir(dir.clone(), e))?
+    {
         let file_name = entry.file_name();
         let Some(file_name) = file_name.to_str() else {
             continue;
@@ -318,16 +410,27 @@ pub async fn log_files(log_path: &str, log_name: &str) -> std::io::Result<Vec<Lo
     Ok(entries)
 }
 
-#[derive(Debug, PartialEq, Eq, Ord)]
+#[derive(Debug)]
 pub struct LogFile {
     pub path: PathBuf,
     pub compressed: bool,
     pub timestamp: Timestamp,
 }
 
+impl Eq for LogFile {}
+impl PartialEq for LogFile {
+    fn eq(&self, other: &Self) -> bool {
+        self.timestamp == other.timestamp
+    }
+}
+impl Ord for LogFile {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.timestamp.cmp(&other.timestamp)
+    }
+}
 impl PartialOrd for LogFile {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.timestamp.partial_cmp(&other.timestamp)
+        Some(self.cmp(other))
     }
 }
 

src/proxy.rs

@@ -0,0 +1,136 @@
+use log::{info, log_enabled, warn};
+use std::convert::Infallible;
+use std::io;
+use std::net::SocketAddr;
+use std::sync::atomic::{AtomicBool, Ordering::Relaxed};
+use std::time::Duration;
+use thiserror::Error;
+use tokio::net::{TcpListener, TcpStream};
+use tokio::time;
+
+pub struct Proxy {
+    pub listen_addrs: Vec<SocketAddr>,
+    pub targets: Vec<SocketAddr>,
+    pub poll: Duration,
+    pub timeout: Duration,
+}
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("failed to listen on {0}: {1}")]
+    ListenFailed(SocketAddr, std::io::Error),
+}
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+impl Proxy {
+    pub async fn run(self) -> Result<Infallible> {
+        let mut listeners = Vec::with_capacity(self.listen_addrs.len());
+        for addr in self.listen_addrs {
+            listeners.push(
+                TcpListener::bind(&addr)
+                    .await
+                    .map_err(|e| Error::ListenFailed(addr, e))?,
+            );
+            info!("listening on {addr}");
+        }
+
+        // all targets are initially ok (better land on a down one than just fail)
+        let targets: Vec<_> = (self.targets.into_iter())
+            .map(|addr| TargetStatus {
+                addr,
+                up: AtomicBool::new(true),
+                timeout: self.timeout,
+            })
+            .collect();
+
+        // the proxy runs forever -> using 'static is not a leak
+        let targets = targets.leak();
+
+        for listener in listeners {
+            tokio::spawn(proxy_listener(listener, targets));
+        }
+
+        check_targets(targets, self.poll).await
+    }
+}
+
+struct TargetStatus {
+    addr: SocketAddr,
+    up: AtomicBool,
+    timeout: Duration,
+}
+impl TargetStatus {
+    fn is_up(&self) -> bool {
+        self.up.load(Relaxed)
+    }
+
+    fn set_up(&self, is_up: bool) {
+        let prev = self.up.swap(is_up, Relaxed);
+        if prev != is_up {
+            if is_up {
+                info!("{} is up", self.addr);
+            } else {
+                warn!("{} is down", self.addr);
+            }
+        }
+    }
+
+    async fn connect(&self) -> io::Result<TcpStream> {
+        let r = match time::timeout(self.timeout, TcpStream::connect(self.addr)).await {
+            Ok(r) => r,
+            Err(e) => Err(io::Error::new(io::ErrorKind::TimedOut, e)),
+        };
+
+        self.set_up(r.is_ok());
+        r
+    }
+}
+
+async fn check_targets(targets: &'static [TargetStatus], poll: Duration) -> ! {
+    use tokio::time;
+    let mut poll_ticker = time::interval(poll);
+    poll_ticker.set_missed_tick_behavior(time::MissedTickBehavior::Skip);
+
+    loop {
+        poll_ticker.tick().await;
+
+        let mut tasks = tokio::task::JoinSet::new();
+
+        for target in targets {
+            tasks.spawn(target.connect());
+        }
+
+        tasks.join_all().await;
+
+        if log_enabled!(log::Level::Info) {
+            let mut infos = String::new();
+            for ts in targets.iter() {
+                infos.push_str(&format!("{} ", ts.addr));
+                infos.push_str(if ts.is_up() { "up   " } else { "down " });
+            }
+            info!("{infos}");
+        }
+    }
+}
+
+async fn proxy_listener(listener: TcpListener, targets: &'static [TargetStatus]) {
+    let mut rng = fastrand::Rng::new();
+
+    loop {
+        let mut active = Vec::with_capacity(targets.len());
+        let (mut src, _) = listener.accept().await.expect("listener.accept() failed");
+
+        active.extend((targets.iter().enumerate()).filter_map(|(i, ts)| ts.is_up().then_some(i)));
+        rng.shuffle(&mut active);
+
+        tokio::spawn(async move {
+            for i in active {
+                if let Ok(mut dst) = targets[i].connect().await {
+                    let _ = tokio::io::copy_bidirectional(&mut src, &mut dst).await;
+                    break;
+                }
+            }
+        });
+    }
+}

src/rc.rs

@@ -0,0 +1 @@
+