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+#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +pub struct Args { + #[arg(short, long, default_value_t = String::from("0.0.0.0:8443"))] + pub addr: String, + #[arg(long, default_value_t = String::from("./server.crt"))] + pub cert: String, + #[arg(long, default_value_t = String::from("./server.key"))] + pub key: String, + #[arg(short, long, default_value_t = String::from("info"))] + pub log_level: String, + #[arg(short, long, default_value_t = 10)] + pub duration: i32, +} diff --git a/src/http2.rs b/src/http2.rs new file mode 100644 index 0000000..c892895 --- /dev/null +++ b/src/http2.rs @@ -0,0 +1,102 @@ +use crate::tcp::get_tcp_rtt; +use crate::ARGS; +use anyhow::Result; +use bytes::Bytes; +use h2::server::SendResponse; +use h2::{Ping, PingPong, RecvStream}; +use http::header::{ACCESS_CONTROL_ALLOW_ORIGIN, CONTENT_TYPE}; +use http::Request; +use serde_json::json; +use std::net::SocketAddr; +use std::sync::Arc; +use tokio::sync::Mutex; +use tracing::{debug, error, info}; + +#[tracing::instrument(fields(uri = %request.uri().path(), ip = %addr.ip()), skip_all)] +pub async fn handle( + request: &mut Request, + respond: &mut SendResponse, + raw_fd: i32, + addr: SocketAddr, + ping_pong: Arc>, +) -> Result<()> { + if request.uri().path() != "/" { + error!(?request, "not found"); + let response = http::Response::builder() + .status(http::StatusCode::NOT_FOUND) + .header(ACCESS_CONTROL_ALLOW_ORIGIN, "*") + .body(())?; + let _ = respond.send_response(response, true)?; + return Ok(()); + } + + let header_frame = http::Response::builder() + .status(http::StatusCode::OK) + .header(CONTENT_TYPE, "application/json") + .header(ACCESS_CONTROL_ALLOW_ORIGIN, "*") + .body(())?; + let mut send = respond.send_response(header_frame, false)?; + + let tls_rtts = tls_rtt(ping_pong).await?; + let (tls_rtt, _std_dev, anomalies) = detect_anomalies(&tls_rtts, 0.5); + let tcp_rtt = get_tcp_rtt(raw_fd); + + // TODO: type convert + let is_proxy = tls_rtt - tcp_rtt as f64 > ARGS.duration as f64 * 1000.0; + + info!(?is_proxy, ?tcp_rtt, ?tls_rtt, ?anomalies, "result"); + + Ok(send.send_data( + json!({ + "is_proxy": is_proxy, + "ip": addr.ip().to_string(), + }) + .to_string() + .into(), + true, + )?) +} + +#[tracing::instrument(skip_all)] +async fn tls_rtt(ping_pong: Arc>) -> Result> { + let mut ping = ping_pong.lock().await; + let mut tls_rtts = vec![]; + for index in 0..10 { + let instant = tokio::time::Instant::now(); + ping.ping(Ping::opaque()).await?; + let duration = instant.elapsed().as_micros(); + debug!(?duration, %index, "ping"); + tls_rtts.push(duration as i32); + } + Ok(tls_rtts) +} + +#[tracing::instrument] +fn detect_anomalies(data: &[i32], threshold: f64) -> (f64, f64, Vec) { + let sum: i32 = data.iter().sum(); + let mean = sum as f64 / data.len() as f64; + + let variance = calculate_variance(data, mean); + let std_dev = variance.sqrt(); + + let anomalies: Vec = data + .iter() + .filter(|&&x| (x as f64 - mean).abs() > threshold * std_dev) + .copied() + .collect(); + + let non_anomalies_count = data.len() - anomalies.len(); + let adjusted_mean = if non_anomalies_count > 0 { + (sum - anomalies.iter().sum::()) as f64 / non_anomalies_count as f64 + } else { + mean + }; + + info!(?data, ?adjusted_mean, ?std_dev, ?anomalies); + + (adjusted_mean, std_dev, anomalies) +} + +fn calculate_variance(data: &[i32], mean: f64) -> f64 { + data.iter().map(|&x| (x as f64 - mean).powi(2)).sum::() / data.len() as f64 +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..e117149 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,94 @@ +use anyhow::Result; +use clap::Parser; +use rustls::pki_types::{CertificateDer, PrivateKeyDer}; +use rustls::ServerConfig; +use std::io::BufReader; +use std::sync::{Arc, LazyLock}; +use tokio::net::TcpListener; +use tracing::{debug, info, trace}; +use tracing_subscriber::layer::SubscriberExt; +use tracing_subscriber::util::SubscriberInitExt; +use tracing_subscriber::EnvFilter; + +mod args; +mod http2; +mod tcp; +mod tls; + +pub static ARGS: LazyLock = LazyLock::new(args::Args::parse); + +#[tokio::main] +async fn main() -> Result<()> { + tracing_subscriber::Registry::default() + .with( + EnvFilter::builder() + .with_default_directive(ARGS.log_level.parse().unwrap()) + .from_env_lossy(), + ) + .with(tracing_subscriber::fmt::layer().pretty()) + .init(); + + let listener = TcpListener::bind(&ARGS.addr).await?; + info!("listening on {}", ARGS.addr); + debug!("listening on {}", ARGS.addr); + trace!("listening on {}", ARGS.addr); + println!("listening on {}", ARGS.addr); + + let server_config = load_tls().expect( + r#" +load tls certificate fail, +run: +openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout server.key -out server.crt + +generate one + "#, + ); + let tls_acceptor = tokio_rustls::TlsAcceptor::from(Arc::new(server_config)); + + loop { + if let Ok((socket, addr)) = listener.accept().await { + info!(name = "Accept TCP connection from", addr = %addr.ip()); + + let tls_acceptor = tls_acceptor.clone(); + tokio::spawn(tcp::handle(socket, tls_acceptor, addr)); + } + } +} + +fn load_tls() -> Result { + info!("load key and cert"); + let cert = load_certs(&ARGS.cert)?; + let key = load_private_key(&ARGS.key)?; + let mut config = rustls::ServerConfig::builder() + .with_no_client_auth() + .with_single_cert(cert, key)?; + config.alpn_protocols = vec![b"h2".to_vec()]; + Ok(config) +} + +fn load_certs(filename: &str) -> Result>> { + let certfile = std::fs::File::open(filename)?; + let mut reader = BufReader::new(certfile); + Ok(rustls_pemfile::certs(&mut reader) + .map(|result| result.expect("parse cert error")) + .collect()) +} + +fn load_private_key(filename: &str) -> Result> { + let keyfile = std::fs::File::open(filename).expect("cannot open private key file"); + let mut reader = BufReader::new(keyfile); + + Ok( + match rustls_pemfile::read_one(&mut reader).expect("cannot parse private key .pem file") { + Some(rustls_pemfile::Item::Pkcs1Key(key)) => key.into(), + Some(rustls_pemfile::Item::Pkcs8Key(key)) => key.into(), + Some(rustls_pemfile::Item::Sec1Key(key)) => key.into(), + _ => { + panic!( + "no keys found in {:?} (encrypted keys not supported)", + filename + ) + } + }, + ) +} diff --git a/src/tcp.rs b/src/tcp.rs new file mode 100644 index 0000000..a178382 --- /dev/null +++ b/src/tcp.rs @@ -0,0 +1,119 @@ +use libc::{self, __u16, __u32, __u64, __u8}; +use std::net::SocketAddr; +use tokio::net::TcpStream; +use tokio_rustls::TlsAcceptor; +use tracing::{error, info}; + +#[tracing::instrument(skip_all)] +pub async fn handle(conn: TcpStream, acceptor: TlsAcceptor, addr: SocketAddr) { + let socket = match acceptor.accept(conn).await { + Ok(v) => v, + Err(err) => { + error!(?err, "Failed to perform TLS handshake"); + return; + } + }; + + info!(name = "Accept TLS connection", addr = %addr.ip()); + + if let Err(err) = super::tls::handle(socket, addr).await { + error!(error = ?err, "error while handle tls connection"); + } +} + +#[repr(C)] +#[derive(Default)] +pub struct TcpInfo { + pub tcpi_state: __u8, + pub tcpi_ca_state: __u8, + pub tcpi_retransmits: __u8, + pub tcpi_probes: __u8, + pub tcpi_backoff: __u8, + pub tcpi_options: __u8, + pub tcpi_snd_wscale_rcv_wscale: __u8, + pub tcpi_delivery_rate_app_limited_fastopen_client_fail: __u8, + + pub tcpi_rto: __u32, + pub tcpi_ato: __u32, + pub tcpi_snd_mss: __u32, + pub tcpi_rcv_mss: __u32, + + pub tcpi_unacked: __u32, + pub tcpi_sacked: __u32, + pub tcpi_lost: __u32, + pub tcpi_retrans: __u32, + pub tcpi_fackets: __u32, + + pub tcpi_last_data_sent: __u32, + pub tcpi_last_ack_sent: __u32, + pub tcpi_last_data_recv: __u32, + pub tcpi_last_ack_recv: __u32, + + pub tcpi_pmtu: __u32, + pub tcpi_rcv_ssthresh: __u32, + pub tcpi_rtt: __u32, + pub tcpi_rttvar: __u32, + pub tcpi_snd_ssthresh: __u32, + pub tcpi_snd_cwnd: __u32, + pub tcpi_advmss: __u32, + pub tcpi_reordering: __u32, + + pub tcpi_rcv_rtt: __u32, + pub tcpi_rcv_space: __u32, + + pub tcpi_total_retrans: __u32, + + pub tcpi_pacing_rate: __u64, + pub tcpi_max_pacing_rate: __u64, + pub tcpi_bytes_acked: __u64, + pub tcpi_bytes_received: __u64, + pub tcpi_segs_out: __u32, + pub tcpi_segs_in: __u32, + + pub tcpi_notsent_bytes: __u32, + pub tcpi_min_rtt: __u32, + pub tcpi_data_segs_in: __u32, + pub tcpi_data_segs_out: __u32, + + pub tcpi_delivery_rate: __u64, + + pub tcpi_busy_time: __u64, + pub tcpi_rwnd_limited: __u64, + pub tcpi_sndbuf_limited: __u64, + + pub tcpi_delivered: __u32, + pub tcpi_delivered_ce: __u32, + + pub tcpi_bytes_sent: __u64, + pub tcpi_bytes_retrans: __u64, + pub tcpi_dsack_dups: __u32, + pub tcpi_reord_seen: __u32, + + pub tcpi_rcv_ooopack: __u32, + + pub tcpi_snd_wnd: __u32, + pub tcpi_rcv_wnd: __u32, + + pub tcpi_rehash: __u32, + + pub tcpi_total_rto: __u16, + pub tcpi_total_rto_recoveries: __u16, + pub tcpi_total_rto_time: __u32, +} + +pub fn get_tcp_rtt(raw_fd: i32) -> u32 { + let mut tcp_info = TcpInfo::default(); + let mut tcp_info_len = std::mem::size_of::() as u32; + + let _ret = unsafe { + libc::getsockopt( + raw_fd, + libc::IPPROTO_TCP, + libc::TCP_INFO, + &mut tcp_info as *mut _ as *mut libc::c_void, + &mut tcp_info_len, + ) + }; + + tcp_info.tcpi_rtt +} diff --git a/src/tls.rs b/src/tls.rs new file mode 100644 index 0000000..2c8bef9 --- /dev/null +++ b/src/tls.rs @@ -0,0 +1,37 @@ +use anyhow::{Context, Result}; +use std::net::SocketAddr; +use std::os::fd::AsRawFd; +use std::sync::Arc; +use tokio::net::TcpStream; +use tokio::sync::Mutex; +use tokio_rustls::server::TlsStream; +use tracing::{error, info, Instrument}; + +#[tracing::instrument(skip_all)] +pub async fn handle(conn: TlsStream, addr: SocketAddr) -> Result<()> { + let raw_fd = conn.get_ref().0.as_raw_fd(); + let mut connection = h2::server::handshake(conn).await?; + info!("H2 connection bound"); + let ping_pong = Arc::new(Mutex::new( + connection.ping_pong().context("ping pong error")?, + )); + + while let Some(result) = connection.accept().await { + let (mut request, mut respond) = result?; + let ping_pong = ping_pong.clone(); + // TODO: spawn a ping task + tokio::spawn( + async move { + if let Err(e) = + super::http2::handle(&mut request, &mut respond, raw_fd, addr, ping_pong).await + { + error!("error while handling request: {}", e); + } + } + .in_current_span(), + ); + } + + connection.graceful_shutdown(); + Ok(()) +}