From 79f4a10d5f2f45673a41a78523507e5bd4d42f62 Mon Sep 17 00:00:00 2001
From: Noratrieb <48135649+Noratrieb@users.noreply.github.com>
Date: Sat, 10 Aug 2024 13:47:55 +0200
Subject: [PATCH] Initial commit

---
 .gitignore     |    1 +
 Cargo.lock     | 1289 ++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   16 +
 LICENSE-APACHE |  201 ++++++++
 README.md      |   21 +
 default.nix    |   10 +
 src/main.rs    |  107 ++++
 7 files changed, 1645 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 LICENSE-APACHE
 create mode 100644 README.md
 create mode 100644 default.nix
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..369d10b
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+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[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 = [
+ "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",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..64cd741
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "pretense"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = "0.7.5"
+eyre = "0.6.12"
+futures = "0.3.30"
+metrics = "0.23.0"
+metrics-exporter-prometheus = { version = "0.15.3", default-features = false, features = [
+    "http-listener",
+] }
+tokio = { version = "1.39.2", features = ["net", "rt"] }
+tracing = "0.1.40"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter", "json"] }
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..261eeb9
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fc9562f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# pretense
+
+Server that listens on arbitary TCP ports and logs connections.
+Connections are immediately closed once opened.
+
+It logs connection attempts to stdout.
+Additionally, prometheus metrics are exposed on `/metrics`.
+
+## Configuration
+
+Configuration is done via environment variables:
+- `PRETENSE_PORTS` (required): Comma-separated list of TCP ports (u16 integers) to listen on.
+  Example: `23,1234`
+- `PRETENSE_METRICS_PORT`: TCP Port (u16 integer) to serve the `/metrics` HTTP endpoint on.
+  If not set, no metrics are served.
+  Example: `2000`
+
+## Note about privileged ports
+
+When listening on a privileged port (on UNIX-like systems, 1-1023), you need permissions to bind on that port.
+On Linux, this can be achieved by giving the binary the `CAP_NET_BIND_SERVICE` capability.
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..8896939
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,10 @@
+{ pkgs ? import <nixpkgs> { }, ... }: pkgs.rustPlatform.buildRustPackage {
+  src = pkgs.lib.cleanSource ./.;
+  pname = "pretense";
+  version = "0.1.0";
+  cargoLock.lockFile = ./Cargo.lock;
+
+  meta = {
+    mainProgram = "pretense";
+  };
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..883ac9a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,107 @@
+use std::net::SocketAddr;
+
+use eyre::{bail, Context, Result};
+use futures::future::BoxFuture;
+use metrics_exporter_prometheus::PrometheusHandle;
+use tokio::net::TcpListener;
+use tracing_subscriber::EnvFilter;
+
+fn main() -> Result<()> {
+    tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .build()
+        .wrap_err("building runtime")?
+        .block_on(run())
+}
+
+async fn run() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::try_from_env("PRETENSE_LOG").unwrap_or_else(|_| EnvFilter::new("info")),
+        )
+        .json()
+        .init();
+
+    let config = std::env::var("PRETENSE_PORTS").wrap_err(
+        "environment variable PRETENSE_PORTS must be set to comma separated list of ports",
+    )?;
+
+    let ports = config
+        .split(',')
+        .map(|port| port.parse::<u16>())
+        .collect::<Result<Vec<_>, _>>()
+        .wrap_err(
+            "PRETENSE_PORTS contains invalid port number, must be comma separted list of ports",
+        )?;
+
+    let metrics_task = match std::env::var("PRETENSE_METRICS_PORT") {
+        Ok(metrics_port) => {
+            let metrics_port = metrics_port
+                .parse::<u16>()
+                .wrap_err("PRETENSE_METRICS_PORT")?;
+            if ports.contains(&metrics_port) {
+                bail!("PRETENSE_PORTS overlaps wtih PRETENSE_METRICS_PORT");
+            }
+            let prom_handle = metrics_exporter_prometheus::PrometheusBuilder::new()
+                .install_recorder()
+                .unwrap();
+            Box::pin(metrics(metrics_port, prom_handle)) as BoxFuture<Result<()>>
+        }
+        Err(_) => Box::pin(async {
+            loop {
+                tokio::task::yield_now().await;
+            }
+        }),
+    };
+
+    let tasks = ports
+        .into_iter()
+        .map(|port| {
+            Box::pin(async move {
+                listen_port(port)
+                    .await
+                    .wrap_err(format!("listening on port {port}"))
+            }) as BoxFuture<Result<()>>
+        })
+        .chain([metrics_task]);
+
+    let result = futures::future::select_all(tasks).await;
+    if let Err(err) = result.0 {
+        tracing::error!(?err, "Failed to listen on port");
+    }
+
+    Ok(())
+}
+
+async fn listen_port(port: u16) -> Result<()> {
+    let local_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), port);
+    let listener = TcpListener::bind(local_addr)
+        .await
+        .wrap_err("listening on port")?;
+
+    let labels = [("port", port.to_string())];
+    let counter = metrics::counter!("pretense_connection", &labels);
+
+    tracing::info!(addr=?local_addr, "Listening on port");
+
+    loop {
+        let (conn, addr) = listener.accept().await.wrap_err("failed to accept port")?;
+        tracing::info!(remote_ip = ?addr.ip(), remote_port = ?addr.port(), "Received connection");
+        counter.increment(1);
+        drop(conn);
+    }
+}
+
+async fn metrics(metrics_port: u16, prom_handle: PrometheusHandle) -> Result<()> {
+    let router: axum::Router = axum::Router::new().route(
+        "/metrics",
+        axum::routing::get(move || std::future::ready(prom_handle.render())),
+    );
+    tracing::info!(port = ?metrics_port, "Starting up metrics server");
+    let listener =
+        TcpListener::bind(SocketAddr::new("0.0.0.0".parse().unwrap(), metrics_port)).await?;
+
+    axum::serve(listener, router.into_make_service())
+        .await
+        .wrap_err("failed to start server")
+}