src/main.rs

   1 use std::future::Future;
   2 use std::io;
   3
   4 use failure::{bail, format_err, Error};
   5 use nix::sys::socket::SockAddr;
   6
   7 #[macro_use]
   8 mod macros;
   9
  10 pub mod apparmor;
  11 pub mod capability;
  12 pub mod client;
  13 pub mod fork;
  14 pub mod lxcseccomp;
  15 pub mod nsfd;
  16 pub mod process;
  17 pub mod seccomp;
  18 pub mod sys_mknod;
  19 pub mod sys_quotactl;
  20 pub mod syscall;
  21 pub mod tools;
  22
  23 use io_uring::socket::SeqPacketListener;
  24
  25 static mut EXECUTOR: *mut futures_executor::ThreadPool = std::ptr::null_mut();
  26
  27 pub fn executor() -> &'static futures_executor::ThreadPool {
  28     unsafe { &*EXECUTOR }
  29 }
  30
  31 pub fn spawn(fut: impl Future<Output = ()> + Send + 'static) {
  32     executor().spawn_ok(fut)
  33 }
  34
  35 fn main() {
  36     let mut executor = futures_executor::ThreadPool::new().expect("spawning worker threadpool");
  37     unsafe {
  38         EXECUTOR = &mut executor;
  39     }
  40     std::sync::atomic::fence(std::sync::atomic::Ordering::Release);
  41
  42     if let Err(err) = executor.run(do_main()) {
  43         eprintln!("error: {}", err);
  44         std::process::exit(1);
  45     }
  46 }
  47
  48 async fn do_main() -> Result<(), Error> {
  49     let socket_path = std::env::args_os()
  50         .nth(1)
  51         .ok_or_else(|| format_err!("missing parameter: socket path to listen on"))?;
  52
  53     match std::fs::remove_file(&socket_path) {
  54         Ok(_) => (),
  55         Err(ref e) if e.kind() == io::ErrorKind::NotFound => (), // Ok
  56         Err(e) => bail!("failed to remove previous socket: {}", e),
  57     }
  58
  59     let address =
  60         SockAddr::new_unix(socket_path.as_os_str()).expect("cannot create struct sockaddr_un?");
  61
  62     let mut listener = SeqPacketListener::bind_default(&address)
  63         .map_err(|e| format_err!("failed to create listening socket: {}", e))?;
  64     loop {
  65         let client = listener.accept().await?;
  66         let client = client::Client::new(client);
  67         spawn(client.main());
  68     }
  69 }