commit 7423846cff9997cfa7a352432acda4481e7f9b52 Author: Charles Date: Sun Dec 22 22:09:09 2024 -0800 add: initial implementation diff --git a/.envrc b/.envrc new file mode 100644 index 0000000..3550a30 --- /dev/null +++ b/.envrc @@ -0,0 +1 @@ +use flake diff --git a/.github/workflows/build_nix.yml b/.github/workflows/build_nix.yml new file mode 100644 index 0000000..87d2eba --- /dev/null +++ b/.github/workflows/build_nix.yml @@ -0,0 +1,13 @@ +name: "Build legacy Nix package on Ubuntu" + +on: + push: + +jobs: + build: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - uses: cachix/install-nix-action@v26 + - name: Building package + run: nix build diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..2d527fd --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,468 @@ +# This file is automatically @generated by Cargo. +# It is not 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It also trackers the relative +frequency of incoming packers, per destination, and allows executing a command +when the frequency becomes, stop being, 0 \ No newline at end of file diff --git a/default.nix b/default.nix new file mode 100644 index 0000000..39bacff --- /dev/null +++ b/default.nix @@ -0,0 +1,7 @@ +(import ( + fetchTarball { + url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz"; + sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; } +) { + src = ./.; +}).defaultNix diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..7666dcc --- /dev/null +++ b/flake.lock @@ -0,0 +1,93 @@ +{ + "nodes": { + "naersk": { + "inputs": { + "nixpkgs": "nixpkgs" + }, + "locked": { + "lastModified": 1733346208, + "narHash": "sha256-a4WZp1xQkrnA4BbnKrzJNr+dYoQr5Xneh2syJoddFyE=", + "owner": "nix-community", + "repo": "naersk", + "rev": "378614f37a6bee5a3f2ef4f825a73d948d3ae921", + "type": "github" + }, + "original": { + "owner": "nix-community", + "ref": "master", + "repo": "naersk", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 0, + "narHash": "sha256-df3dJApLPhd11AlueuoN0Q4fHo/hagP75LlM5K1sz9g=", + "path": "/nix/store/ly4s3hw35dd1c2vsd694y2715pc1d2c1-source", + "type": "path" + }, + "original": { + "id": "nixpkgs", + "type": "indirect" + } + }, + "nixpkgs_2": { + "locked": { + "lastModified": 1734435836, + "narHash": "sha256-kMBQ5PRiFLagltK0sH+08aiNt3zGERC2297iB6vrvlU=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "4989a246d7a390a859852baddb1013f825435cee", + "type": "github" + }, + "original": { + "owner": "NixOS", + "ref": "nixpkgs-unstable", + "repo": "nixpkgs", + "type": "github" + } + }, + "root": { + "inputs": { + "naersk": "naersk", + "nixpkgs": "nixpkgs_2", + "utils": "utils" + } + }, + "systems": { + "locked": { + "lastModified": 1681028828, + "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=", + "owner": "nix-systems", + "repo": "default", + "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e", + "type": "github" + }, + "original": { + "owner": "nix-systems", + "repo": "default", + "type": "github" + } + }, + "utils": { + "inputs": { + "systems": "systems" + }, + "locked": { + "lastModified": 1731533236, + "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b", + "type": "github" + }, + "original": { + "owner": "numtide", + "repo": "flake-utils", + "type": "github" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..447c002 --- /dev/null +++ b/flake.nix @@ -0,0 +1,22 @@ +{ + inputs = { + naersk.url = "github:nix-community/naersk/master"; + nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable"; + utils.url = "github:numtide/flake-utils"; + }; + + outputs = { self, nixpkgs, utils, naersk }: + utils.lib.eachDefaultSystem (system: + let + pkgs = import nixpkgs { inherit system; }; + naersk-lib = pkgs.callPackage naersk { }; + in + { + defaultPackage = naersk-lib.buildPackage ./.; + devShell = with pkgs; mkShell { + buildInputs = [ netcat-gnu cargo rustc rustfmt pre-commit rustPackages.clippy ]; + RUST_SRC_PATH = rustPlatform.rustLibSrc; + }; + } + ); +} diff --git a/shell.nix b/shell.nix new file mode 100644 index 0000000..77db547 --- /dev/null +++ b/shell.nix @@ -0,0 +1,7 @@ +(import ( + fetchTarball { + url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz"; + sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; } +) { + src = ./.; +}).shellNix diff --git a/sleep.sh b/sleep.sh new file mode 100755 index 0000000..8cd89a7 --- /dev/null +++ b/sleep.sh @@ -0,0 +1,3 @@ +#!/usr/bin/env bash + +echo "sleep" \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..ada379e --- /dev/null +++ b/src/main.rs @@ -0,0 +1,112 @@ +use std::{ + collections::HashMap, net::SocketAddr, process::{self, Command}, time::Duration +}; + +use clap::Parser; +use tokio::{io, net::UdpSocket, select, sync::mpsc::{self, Sender}, task, time}; + +/// Simple program to greet a person +#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +struct Args { + /// The address to accept requests on, in the form + /// `0.0.0.0:1234` or `[::1]:1234` + #[arg(short, long)] + source: String, + + /// The address to to send traffic to, in the form + /// `0.0.0.0:1234` or `[::1]:1234` + #[arg(short, long)] + dest: String, + + /// Script/command to call when there is low usage + /// Low is currently hard-coded to mean no packets processed + /// within 30s. + #[arg(short, long)] + low: String, + + /// Script/command to call when there is use + #[arg(short, long)] + used: String, +} + +#[tokio::main] +async fn main() -> io::Result<()> { + let args = Args::parse(); + let sock = match UdpSocket::bind(&args.source).await { + Ok(c) => c, + Err(e) => { + eprintln!("failed to listen on '{}': {}", args.source, e); + process::exit(1); + } + }; + + let remote = match args.dest.parse::() { + Ok(c) => c, + Err(e) => { + eprintln!("failed to parse destination '{}': {}", args.dest, e); + process::exit(1); + } + }; + + // Make a const copy of the used and low args so we can pass around + let low: &'static str = args.low.leak(); + let high: &'static str = args.used.leak(); + + let mut sleeping = false; + let mut out: HashMap>> = HashMap::default(); + + // We give a little bit of extra room here just because. + // Max UDP size should be 65_527 + let mut buf = [0; 70_000]; + loop { + let (len, addr) = select! { + x = sock.recv_from(&mut buf) => x, + _ = time::sleep(Duration::from_millis(3000)) => { + // Clear outgoing connections; call low + out.clear(); + if sleeping { + continue; + } + sleeping = true; + match Command::new(low).spawn() { + Ok(_) => (), + Err(e) => { + eprintln!("WARN: failed to run '{}': {}", low, e); + () + } + }; + continue; + } + }?; + sleeping = false; + if out.len() == 0 { + match Command::new(high).spawn() { + Ok(_) => (), + Err(e) => { + eprintln!("WARN: failed to run '{}': {}", high, e); + () + } + }; + } + if !out.contains_key(&addr) { + let (tx, mut rx) = mpsc::channel::>(1000); + let remote = remote.clone(); + task::spawn(async move { + let conn = UdpSocket::bind("[::]:0").await.unwrap(); + conn.connect(remote).await.unwrap(); + while let Some(data) = rx.recv().await { + match conn.send(&data).await { + Ok(_) => (), + Err(e) => { + eprintln!("Error sending data: {}", e); + } + }; + } + }); + out.insert(addr, tx); + } + + out.get(&addr).unwrap().send(Vec::from(&buf[..len])).await.unwrap(); + } +} diff --git a/wake.sh b/wake.sh new file mode 100755 index 0000000..d435b2e --- /dev/null +++ b/wake.sh @@ -0,0 +1,3 @@ +#!/usr/bin/env sh + +echo "wake" \ No newline at end of file