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[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy"
|
||||
version = "0.7.35"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
|
||||
dependencies = [
|
||||
"byteorder",
|
||||
"zerocopy-derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy-derive"
|
||||
version = "0.7.35"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
9
Cargo.toml
Normal file
9
Cargo.toml
Normal file
|
|
@ -0,0 +1,9 @@
|
|||
[package]
|
||||
name = "qotdd"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
eyre = "0.6.12"
|
||||
rand = "0.8.5"
|
||||
tokio = { version = "1.39.3", features = ["full"] }
|
||||
7
README.md
Normal file
7
README.md
Normal file
|
|
@ -0,0 +1,7 @@
|
|||
# qotdd
|
||||
|
||||
Quote of The Day Daemon.
|
||||
|
||||
A small service implementing the Quote of the Day protocol according to [RFC 865](https://datatracker.ietf.org/doc/html/rfc865).
|
||||
|
||||
Protects against DoS amplification attacks by aggressively rate-limiting every source IP.
|
||||
6
default.nix
Normal file
6
default.nix
Normal file
|
|
@ -0,0 +1,6 @@
|
|||
{ pkgs ? import <nixpkgs> { } }: pkgs.rustPlatform.buildRustPackage {
|
||||
src = pkgs.lib.cleanSource ./.;
|
||||
pname = "qotdd";
|
||||
version = "0.1.0";
|
||||
cargoLock.lockFile = ./Cargo.lock;
|
||||
}
|
||||
123
src/main.rs
Normal file
123
src/main.rs
Normal file
|
|
@ -0,0 +1,123 @@
|
|||
use std::{
|
||||
collections::HashMap,
|
||||
net::{IpAddr, Ipv4Addr, SocketAddr},
|
||||
time::Duration,
|
||||
};
|
||||
|
||||
use eyre::{bail, ensure, Context, Result};
|
||||
use rand::seq::SliceRandom;
|
||||
use tokio::{io::AsyncWriteExt, net::TcpListener};
|
||||
|
||||
#[tokio::main(flavor = "current_thread")]
|
||||
async fn main() -> Result<()> {
|
||||
let port: u16 = match std::env::var("QUOTDD_PORT") {
|
||||
Ok(port) => match port.parse() {
|
||||
Ok(port) => port,
|
||||
Err(err) => {
|
||||
bail!("error: invalid port passed in QUOTDD_PORT: {err}");
|
||||
}
|
||||
},
|
||||
Err(_) => 17,
|
||||
};
|
||||
|
||||
let quotes = [
|
||||
"Quickness is the essence of the war. ~ Sun Tsu",
|
||||
"Pretend inferiority and encourage his arrogance. ~ Sun Tsu",
|
||||
];
|
||||
|
||||
ensure!(!quotes.is_empty(), "Quotes are empty");
|
||||
|
||||
let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), port);
|
||||
|
||||
eprintln!("info: Listening on socket {}", addr);
|
||||
|
||||
let listener = TcpListener::bind(addr)
|
||||
.await
|
||||
.wrap_err_with(|| format!("binding on port {port}"))?;
|
||||
|
||||
let mut reset = tokio::time::interval(Duration::from_secs(60));
|
||||
|
||||
let mut limits = RateLimits::default();
|
||||
|
||||
loop {
|
||||
tokio::select! {
|
||||
result = tcp_loop(&listener, "es, &mut limits) => {
|
||||
result?;
|
||||
}
|
||||
_ = reset.tick() => {
|
||||
limits.lower();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
async fn tcp_loop(listener: &TcpListener, quotes: &[&str], limits: &mut RateLimits) -> Result<()> {
|
||||
let (mut conn, peer) = listener.accept().await.wrap_err("accepting connection")?;
|
||||
|
||||
if !limits.accept(peer.ip()) {
|
||||
conn.shutdown().await.wrap_err("closing connection")?;
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
let quote = quotes.choose(&mut rand::thread_rng()).unwrap();
|
||||
|
||||
conn.write_all(quote.as_bytes())
|
||||
.await
|
||||
.wrap_err("writing quote")?;
|
||||
conn.write_all(b"\n").await.wrap_err("writing quote")?;
|
||||
|
||||
conn.shutdown().await.wrap_err("closing connection")?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// To avoid DoS amplification attacks, we ratelimit our service based on the IP.
|
||||
// Sorry, but you're not getting many quotes...
|
||||
#[derive(Default)]
|
||||
struct RateLimits {
|
||||
ips: HashMap<IpAddr, usize>,
|
||||
}
|
||||
|
||||
impl RateLimits {
|
||||
fn accept(&mut self, addr: IpAddr) -> bool {
|
||||
let count = self.ips.entry(addr).or_default();
|
||||
let old = *count;
|
||||
*count += 1;
|
||||
old < 10
|
||||
}
|
||||
|
||||
fn lower(&mut self) {
|
||||
self.ips
|
||||
.values_mut()
|
||||
.for_each(|v| *v = v.saturating_sub(10));
|
||||
self.ips.retain(|_, v| *v > 0);
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
use std::net::{IpAddr, Ipv4Addr};
|
||||
|
||||
use crate::RateLimits;
|
||||
|
||||
#[test]
|
||||
fn ratelimit() {
|
||||
let mut limits = RateLimits::default();
|
||||
let ip = IpAddr::V4(Ipv4Addr::LOCALHOST);
|
||||
|
||||
for _ in 0..10 {
|
||||
assert!(limits.accept(ip))
|
||||
}
|
||||
|
||||
for _ in 0..10 {
|
||||
assert!(!limits.accept(ip))
|
||||
}
|
||||
|
||||
limits.lower();
|
||||
|
||||
assert!(!limits.accept(ip));
|
||||
|
||||
limits.lower();
|
||||
|
||||
assert!(limits.accept(ip));
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue