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GNU AFFERO GENERAL PUBLIC LICENSE
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16
Cargo.toml
View File

@ -0,0 +1,16 @@
[package]
name = "ipcsockd"
version = "0.1.0"
edition = "2021"
# Compiler optimizations picked up from
# https://arusahni.net/blog/2020/03/optimizing-rust-binary-size.html
[profile.release]
opt-level = "s"
lto = true
codegen-units = 1
[dependencies]
clap = { version = "4.0.11", features = ["derive"] }
signal-hook = "*"
tokio = { version = "1", features = ["full"] }

15
LICENSE
View File

@ -0,0 +1,15 @@
Copyright (C) 2022 Pranav Karawale <https://karawale.in>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

91
src/main.rs
View File

@ -0,0 +1,91 @@
// SPDX-FileCopyrightText: 2022 Pranav Karawale <https://karawale.in>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
use clap::Parser;
use signal_hook::consts::TERM_SIGNALS;
use signal_hook::iterator::Signals;
use std::error::Error;
use std::os::unix::prelude::OwnedFd;
use std::path::Path;
use std::sync::atomic::{AtomicU32, Ordering};
use std::sync::Arc;
use tokio::net::UnixListener;
use tokio::{fs, process};
/// A super-server daemon for UNIX domain sockets.
#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Cli {
/// Path of the UNIX socket to listen on.
path: String,
/// Command with arguments to execute for every incoming connection.
cmd: Vec<String>,
/// Maximum concurrent connections per second.
#[arg(short, long, default_value_t = 40u32)]
limit: u32,
}
static START_MESSAGE: &str = "OK";
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
let cli = Cli::parse();
let limit = cli.limit.clone();
if Path::new(cli.path.as_str()).exists() {
fs::remove_file(cli.path.clone()).await?;
}
let listener = UnixListener::bind(cli.path.clone())?;
let thread_count = Arc::new(AtomicU32::new(0));
tokio::spawn(async move {
eprintln!("{}", START_MESSAGE);
loop {
if thread_count.load(Ordering::Relaxed) < limit {
let (conn, _) = listener.accept().await.unwrap();
let std_conn = conn.into_std().unwrap();
let conn_as_fd = OwnedFd::try_from(std_conn).unwrap();
let thread_count = Arc::clone(&thread_count);
let cmd = cli.cmd.clone();
thread_count.fetch_add(1, Ordering::Relaxed);
tokio::spawn(async move {
handle_conn(cmd, conn_as_fd, thread_count).await;
})
.await
.unwrap();
}
}
});
let mut signals = Signals::new(TERM_SIGNALS)?;
for _ in signals.forever() {
fs::remove_file(cli.path.clone()).await?;
break;
}
Ok(())
}
async fn handle_conn(sock_cmd: Vec<String>, conn_as_fd: OwnedFd, count: Arc<AtomicU32>) {
let (_, cmd_args) = sock_cmd.as_slice().split_first().unwrap();
let stdin = conn_as_fd.try_clone().unwrap();
let stdout = conn_as_fd.try_clone().unwrap();
let mut handle = process::Command::new(sock_cmd.first().to_owned().unwrap())
.args(cmd_args.to_owned())
.stdin(stdin)
.stdout(stdout)
.spawn()
.unwrap();
handle.wait().await.unwrap();
count.fetch_sub(1, Ordering::SeqCst);
}