commit a747b0c8d3871483ee64f865d57dc10ccd828ec0
Author: Daniel Barlow <dan@telent.net>
Date: Wed, 29 Apr 2026 19:04:02 +0100
initial commit
Diffstat:
6 files changed, 471 insertions(+), 0 deletions(-)
diff --git a/Cargo.lock b/Cargo.lock
@@ -0,0 +1,267 @@
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diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "luad"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+fork = "0.7.0"
+libc = "0.2.186"
+mlua = { version = "0.11.6", features = ["lua53"] }
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"
diff --git a/rustup.nix b/rustup.nix
@@ -0,0 +1,52 @@
+{ pkgs ? import <nixpkgs> {} }:
+ let
+ overrides = (builtins.fromTOML (builtins.readFile ./rust-toolchain.toml));
+ libPath = with pkgs; lib.makeLibraryPath [
+ # load external libraries that you need in your rust project here
+ ];
+ python = (pkgs.python3.withPackages (python-pkgs: [
+ python-pkgs.pynacl
+ python-pkgs.zeroconf
+ python-pkgs.bleak
+ ]));
+ in
+ pkgs.mkShell rec {
+ nativeBuildInputs= with pkgs; [
+ openssl
+ rustup
+ lua5_3
+ pkg-config
+# sops
+ ];
+ buildInputs = with pkgs; [
+ clang
+ # Replace llvmPackages with llvmPackages_X, where X is the latest LLVM version (at the time of writing, 16)
+ llvmPackages.bintools
+ rustup
+ ];
+ RUSTC_VERSION = overrides.toolchain.channel;
+ # https://github.com/rust-lang/rust-bindgen#environment-variables
+ LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
+ shellHook = ''
+ export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
+ export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
+ '';
+ # Add precompiled library to rustc search path
+ RUSTFLAGS = (builtins.map (a: ''-L ${a}/lib'') [
+ # add libraries here (e.g. pkgs.libvmi)
+ ]);
+ LD_LIBRARY_PATH = libPath;
+ # Add glibc, clang, glib, and other headers to bindgen search path
+ BINDGEN_EXTRA_CLANG_ARGS =
+ # Includes normal include path
+ (builtins.map (a: ''-I"${a}/include"'') [
+ # add dev libraries here (e.g. pkgs.libvmi.dev)
+ pkgs.glibc.dev
+ ])
+ # Includes with special directory paths
+ ++ [
+ ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
+ ''-I"${pkgs.glib.dev}/include/glib-2.0"''
+ ''-I${pkgs.glib.out}/lib/glib-2.0/include/''
+ ];
+ }
diff --git a/src/bin/luac.rs b/src/bin/luac.rs
@@ -0,0 +1,36 @@
+#![feature(unix_socket_ancillary_data)]
+
+use std::{
+ os::unix::net::{
+ UnixDatagram,
+ SocketAncillary,
+ AncillaryData
+ },
+ env,
+ io::IoSlice
+};
+
+fn main() {
+ let mut payload = "".to_string();
+ let mut argv = env::args();
+ let _ = argv.next();
+ for a in argv {
+ payload.push_str(&a);
+ payload.push_str("\0");
+ }
+ let payload = payload.into_bytes();
+ let Ok(sock_path) = env::var("LUAD_SOCKET_PATH") else {
+ panic!("need to set LUAD_SOCKET_PATH env var");
+ };
+ let sock = UnixDatagram::unbound().expect("socket");
+ sock.connect(sock_path).expect("connect");
+ let fds = [0, 1, 2];
+ let mut ancillary_buffer = [0; 128];
+ let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+ ancillary.add_fds(&fds[..]);
+ let buf = IoSlice::new(&payload);
+ sock.send_vectored_with_ancillary(&[buf], &mut ancillary).expect("send failed");
+
+
+ println!("heyt");
+}
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,105 @@
+#![feature(unix_socket_ancillary_data)]
+
+use mlua::Lua;
+use std::{
+ env,
+ io,
+ io::IoSliceMut,
+ path::Path,
+ process::exit,
+ collections::HashMap
+};
+
+use std::os::unix::net::{
+ UnixDatagram,
+ SocketAncillary,
+ AncillaryData
+};
+
+use libc::WEXITSTATUS;
+use fork::{Fork, fork, waitpid};
+
+// if we use SCM_RIGHTS to pass fds from client, we also need to
+// write the client as we can't do that with socat
+
+fn run_lua(lua : &Lua, path : &Path) {
+ let chunk = lua.load(path);
+ match chunk.exec() {
+ Ok(()) => { println!("lua returned ok"); },
+ Err(e) => {
+ println!("lua error {:?}", e);
+ exit(1);
+ },
+ };
+ exit(0);
+}
+
+fn main() -> std::io::Result<()> {
+ let Ok(sock_path) = env::var("LUAD_SOCKET_PATH") else {
+ panic!("need to set LUAD_SOCKET_PATH env var");
+ };
+
+ let lua = unsafe { Lua::unsafe_new() };
+
+ let sock = UnixDatagram::bind(sock_path)?;
+
+ // listen for datagrams. each time we get one, fork a child
+ // to run lua script with the datagram payload and its stdio
+ // connected to the passed fds. when the lua subprocess exits,
+ // write the exit status back to the peer
+ // this implies we need a map of child pid -> peer address
+
+ loop {
+ let mut buf = [0u8; 1024];
+ let mut bufs = [
+ IoSliceMut::new(&mut buf),
+ ];
+ let mut ancillary_buffer = [0; 128];
+ let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+ match sock.recv_vectored_with_ancillary(&mut bufs, &mut ancillary) {
+ Ok((size, truncated)) => {
+ let mut fds : Vec<i32> = Vec::new();
+ for ancillary_result in ancillary.messages() {
+ if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+ for fd in scm_rights {
+ println!("receive file descriptor: {fd}");
+ fds.push(fd);
+ }
+ }
+ }
+ println!("data {:?}, len {:?}", buf, size);
+ println!("fds {:?}", fds);
+
+ },
+ Err(e) => {
+ println!("error reading: {:?}", e);
+ }
+ }
+ }
+
+ // for pathname in io::stdin().lines() {
+ // let pathname = pathname.unwrap();
+ // let path = Path::new(&pathname);
+ // match fork() {
+ // Ok(Fork::Parent(pid)) => {
+ // // println!("parent {:?} {:?}", pid, result);
+ // match waitpid(pid) {
+ // Ok(status) => {
+ // println!("exited {:?}", WEXITSTATUS(status));
+ // },
+ // Err(e) => {
+ // println!("waitpid failed {:?}", e);
+ // }
+ // }
+ // },
+ // Ok(Fork::Child) => {
+ // run_lua(&lua, &path);
+ // }
+ // Err(e) => {
+ // println!("fork error {:?}", e);
+ // exit(1);
+ // }
+ // }
+ // };
+ // Ok(())
+}
