commit 565ee5ff1fdfd2933bf557ee37e7ef0d5a86b8fb
Author: MeexReay <meexreay@gmail.com>
Date:   Mon Jul 28 11:50:42 2025 +0300

    init commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b244a72
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "quicproxy"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+quinn = { version = "0.11.8", features = ["rustls"] }
+tokio = { version = "1.47.0", features = ["rt", "macros"] }
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2b3215a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,8 @@
+Copyright (c) 2025 MeexReay <meexreay@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..ea85e02
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,169 @@
+//! This example demonstrates an HTTP client that requests files from a server.
+//!
+//! Checkout the `README.md` for guidance.
+
+use std::{
+    fs,
+    io::{self, Write},
+    net::{SocketAddr, ToSocketAddrs},
+    path::PathBuf,
+    sync::Arc,
+    time::{Duration, Instant},
+};
+
+use anyhow::{Result, anyhow};
+use clap::Parser;
+use proto::crypto::rustls::QuicClientConfig;
+use rustls::pki_types::CertificateDer;
+use tracing::{error, info};
+use url::Url;
+
+mod common;
+
+/// HTTP/0.9 over QUIC client
+#[derive(Parser, Debug)]
+#[clap(name = "client")]
+struct Opt {
+    /// Perform NSS-compatible TLS key logging to the file specified in `SSLKEYLOGFILE`.
+    #[clap(long = "keylog")]
+    keylog: bool,
+
+    url: Url,
+
+    /// Override hostname used for certificate verification
+    #[clap(long = "host")]
+    host: Option<String>,
+
+    /// Custom certificate authority to trust, in DER format
+    #[clap(long = "ca")]
+    ca: Option<PathBuf>,
+
+    /// Simulate NAT rebinding after connecting
+    #[clap(long = "rebind")]
+    rebind: bool,
+
+    /// Address to bind on
+    #[clap(long = "bind", default_value = "[::]:0")]
+    bind: SocketAddr,
+}
+
+fn main() {
+    tracing::subscriber::set_global_default(
+        tracing_subscriber::FmtSubscriber::builder()
+            .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+            .finish(),
+    )
+    .unwrap();
+    let opt = Opt::parse();
+    let code = {
+        if let Err(e) = run(opt) {
+            eprintln!("ERROR: {e}");
+            1
+        } else {
+            0
+        }
+    };
+    ::std::process::exit(code);
+}
+
+#[tokio::main]
+async fn run(options: Opt) -> Result<()> {
+    let url = options.url;
+    let url_host = strip_ipv6_brackets(url.host_str().unwrap());
+    let remote = (url_host, url.port().unwrap_or(4433))
+        .to_socket_addrs()?
+        .next()
+        .ok_or_else(|| anyhow!("couldn't resolve to an address"))?;
+
+    let mut roots = rustls::RootCertStore::empty();
+    if let Some(ca_path) = options.ca {
+        roots.add(CertificateDer::from(fs::read(ca_path)?))?;
+    } else {
+        let dirs = directories_next::ProjectDirs::from("org", "quinn", "quinn-examples").unwrap();
+        match fs::read(dirs.data_local_dir().join("cert.der")) {
+            Ok(cert) => {
+                roots.add(CertificateDer::from(cert))?;
+            }
+            Err(ref e) if e.kind() == io::ErrorKind::NotFound => {
+                info!("local server certificate not found");
+            }
+            Err(e) => {
+                error!("failed to open local server certificate: {}", e);
+            }
+        }
+    }
+    let mut client_crypto = rustls::ClientConfig::builder()
+        .with_root_certificates(roots)
+        .with_no_client_auth();
+
+    client_crypto.alpn_protocols = common::ALPN_QUIC_HTTP.iter().map(|&x| x.into()).collect();
+    if options.keylog {
+        client_crypto.key_log = Arc::new(rustls::KeyLogFile::new());
+    }
+
+    let client_config =
+        quinn::ClientConfig::new(Arc::new(QuicClientConfig::try_from(client_crypto)?));
+    let mut endpoint = quinn::Endpoint::client(options.bind)?;
+    endpoint.set_default_client_config(client_config);
+
+    let request = format!("GET {}\r\n", url.path());
+    let start = Instant::now();
+    let rebind = options.rebind;
+    let host = options.host.as_deref().unwrap_or(url_host);
+
+    eprintln!("connecting to {host} at {remote}");
+    let conn = endpoint
+        .connect(remote, host)?
+        .await
+        .map_err(|e| anyhow!("failed to connect: {}", e))?;
+    eprintln!("connected at {:?}", start.elapsed());
+    let (mut send, mut recv) = conn
+        .open_bi()
+        .await
+        .map_err(|e| anyhow!("failed to open stream: {}", e))?;
+    if rebind {
+        let socket = std::net::UdpSocket::bind("[::]:0").unwrap();
+        let addr = socket.local_addr().unwrap();
+        eprintln!("rebinding to {addr}");
+        endpoint.rebind(socket).expect("rebind failed");
+    }
+
+    send.write_all(request.as_bytes())
+        .await
+        .map_err(|e| anyhow!("failed to send request: {}", e))?;
+    send.finish().unwrap();
+    let response_start = Instant::now();
+    eprintln!("request sent at {:?}", response_start - start);
+    let resp = recv
+        .read_to_end(usize::MAX)
+        .await
+        .map_err(|e| anyhow!("failed to read response: {}", e))?;
+    let duration = response_start.elapsed();
+    eprintln!(
+        "response received in {:?} - {} KiB/s",
+        duration,
+        resp.len() as f32 / (duration_secs(&duration) * 1024.0)
+    );
+    io::stdout().write_all(&resp).unwrap();
+    io::stdout().flush().unwrap();
+    conn.close(0u32.into(), b"done");
+
+    // Give the server a fair chance to receive the close packet
+    endpoint.wait_idle().await;
+
+    Ok(())
+}
+
+fn strip_ipv6_brackets(host: &str) -> &str {
+    // An ipv6 url looks like eg https://[::1]:4433/Cargo.toml, wherein the host [::1] is the
+    // ipv6 address ::1 wrapped in brackets, per RFC 2732. This strips those.
+    if host.starts_with('[') && host.ends_with(']') {
+        &host[1..host.len() - 1]
+    } else {
+        host
+    }
+}
+
+fn duration_secs(x: &Duration) -> f32 {
+    x.as_secs() as f32 + x.subsec_nanos() as f32 * 1e-9
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..298562f
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,271 @@
+//! This example demonstrates an HTTP server that serves files from a directory.
+//!
+//! Checkout the `README.md` for guidance.
+
+use std::{
+    ascii, fs, io,
+    net::SocketAddr,
+    path::{self, Path, PathBuf},
+    str,
+    sync::Arc,
+};
+
+use anyhow::{Context, Result, anyhow, bail};
+use clap::Parser;
+use proto::crypto::rustls::QuicServerConfig;
+use rustls::pki_types::{CertificateDer, PrivateKeyDer, PrivatePkcs8KeyDer};
+use tracing::{error, info, info_span};
+use tracing_futures::Instrument as _;
+
+mod common;
+
+#[derive(Parser, Debug)]
+#[clap(name = "server")]
+struct Opt {
+    /// file to log TLS keys to for debugging
+    #[clap(long = "keylog")]
+    keylog: bool,
+    /// directory to serve files from
+    root: PathBuf,
+    /// TLS private key in PEM format
+    #[clap(short = 'k', long = "key", requires = "cert")]
+    key: Option<PathBuf>,
+    /// TLS certificate in PEM format
+    #[clap(short = 'c', long = "cert", requires = "key")]
+    cert: Option<PathBuf>,
+    /// Enable stateless retries
+    #[clap(long = "stateless-retry")]
+    stateless_retry: bool,
+    /// Address to listen on
+    #[clap(long = "listen", default_value = "[::1]:4433")]
+    listen: SocketAddr,
+    /// Client address to block
+    #[clap(long = "block")]
+    block: Option<SocketAddr>,
+    /// Maximum number of concurrent connections to allow
+    #[clap(long = "connection-limit")]
+    connection_limit: Option<usize>,
+}
+
+fn main() {
+    tracing::subscriber::set_global_default(
+        tracing_subscriber::FmtSubscriber::builder()
+            .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+            .finish(),
+    )
+    .unwrap();
+    let opt = Opt::parse();
+    let code = {
+        if let Err(e) = run(opt) {
+            eprintln!("ERROR: {e}");
+            1
+        } else {
+            0
+        }
+    };
+    ::std::process::exit(code);
+}
+
+#[tokio::main]
+async fn run(options: Opt) -> Result<()> {
+    let (certs, key) = if let (Some(key_path), Some(cert_path)) = (&options.key, &options.cert) {
+        let key = fs::read(key_path).context("failed to read private key")?;
+        let key = if key_path.extension().is_some_and(|x| x == "der") {
+            PrivateKeyDer::Pkcs8(PrivatePkcs8KeyDer::from(key))
+        } else {
+            rustls_pemfile::private_key(&mut &*key)
+                .context("malformed PKCS #1 private key")?
+                .ok_or_else(|| anyhow::Error::msg("no private keys found"))?
+        };
+        let cert_chain = fs::read(cert_path).context("failed to read certificate chain")?;
+        let cert_chain = if cert_path.extension().is_some_and(|x| x == "der") {
+            vec![CertificateDer::from(cert_chain)]
+        } else {
+            rustls_pemfile::certs(&mut &*cert_chain)
+                .collect::<Result<_, _>>()
+                .context("invalid PEM-encoded certificate")?
+        };
+
+        (cert_chain, key)
+    } else {
+        let dirs = directories_next::ProjectDirs::from("org", "quinn", "quinn-examples").unwrap();
+        let path = dirs.data_local_dir();
+        let cert_path = path.join("cert.der");
+        let key_path = path.join("key.der");
+        let (cert, key) = match fs::read(&cert_path).and_then(|x| Ok((x, fs::read(&key_path)?))) {
+            Ok((cert, key)) => (
+                CertificateDer::from(cert),
+                PrivateKeyDer::try_from(key).map_err(anyhow::Error::msg)?,
+            ),
+            Err(ref e) if e.kind() == io::ErrorKind::NotFound => {
+                info!("generating self-signed certificate");
+                let cert = rcgen::generate_simple_self_signed(vec!["localhost".into()]).unwrap();
+                let key = PrivatePkcs8KeyDer::from(cert.signing_key.serialize_der());
+                let cert = cert.cert.into();
+                fs::create_dir_all(path).context("failed to create certificate directory")?;
+                fs::write(&cert_path, &cert).context("failed to write certificate")?;
+                fs::write(&key_path, key.secret_pkcs8_der())
+                    .context("failed to write private key")?;
+                (cert, key.into())
+            }
+            Err(e) => {
+                bail!("failed to read certificate: {}", e);
+            }
+        };
+
+        (vec![cert], key)
+    };
+
+    let mut server_crypto = rustls::ServerConfig::builder()
+        .with_no_client_auth()
+        .with_single_cert(certs, key)?;
+    server_crypto.alpn_protocols = common::ALPN_QUIC_HTTP.iter().map(|&x| x.into()).collect();
+    if options.keylog {
+        server_crypto.key_log = Arc::new(rustls::KeyLogFile::new());
+    }
+
+    let mut server_config =
+        quinn::ServerConfig::with_crypto(Arc::new(QuicServerConfig::try_from(server_crypto)?));
+    let transport_config = Arc::get_mut(&mut server_config.transport).unwrap();
+    transport_config.max_concurrent_uni_streams(0_u8.into());
+
+    let root = Arc::<Path>::from(options.root.clone());
+    if !root.exists() {
+        bail!("root path does not exist");
+    }
+
+    let endpoint = quinn::Endpoint::server(server_config, options.listen)?;
+    eprintln!("listening on {}", endpoint.local_addr()?);
+
+    while let Some(conn) = endpoint.accept().await {
+        if options
+            .connection_limit
+            .is_some_and(|n| endpoint.open_connections() >= n)
+        {
+            info!("refusing due to open connection limit");
+            conn.refuse();
+        } else if Some(conn.remote_address()) == options.block {
+            info!("refusing blocked client IP address");
+            conn.refuse();
+        } else if options.stateless_retry && !conn.remote_address_validated() {
+            info!("requiring connection to validate its address");
+            conn.retry().unwrap();
+        } else {
+            info!("accepting connection");
+            let fut = handle_connection(root.clone(), conn);
+            tokio::spawn(async move {
+                if let Err(e) = fut.await {
+                    error!("connection failed: {reason}", reason = e.to_string())
+                }
+            });
+        }
+    }
+
+    Ok(())
+}
+
+async fn handle_connection(root: Arc<Path>, conn: quinn::Incoming) -> Result<()> {
+    let connection = conn.await?;
+    let span = info_span!(
+        "connection",
+        remote = %connection.remote_address(),
+        protocol = %connection
+            .handshake_data()
+            .unwrap()
+            .downcast::<quinn::crypto::rustls::HandshakeData>().unwrap()
+            .protocol
+            .map_or_else(|| "<none>".into(), |x| String::from_utf8_lossy(&x).into_owned())
+    );
+    async {
+        info!("established");
+
+        // Each stream initiated by the client constitutes a new request.
+        loop {
+            let stream = connection.accept_bi().await;
+            let stream = match stream {
+                Err(quinn::ConnectionError::ApplicationClosed { .. }) => {
+                    info!("connection closed");
+                    return Ok(());
+                }
+                Err(e) => {
+                    return Err(e);
+                }
+                Ok(s) => s,
+            };
+            let fut = handle_request(root.clone(), stream);
+            tokio::spawn(
+                async move {
+                    if let Err(e) = fut.await {
+                        error!("failed: {reason}", reason = e.to_string());
+                    }
+                }
+                .instrument(info_span!("request")),
+            );
+        }
+    }
+    .instrument(span)
+    .await?;
+    Ok(())
+}
+
+async fn handle_request(
+    root: Arc<Path>,
+    (mut send, mut recv): (quinn::SendStream, quinn::RecvStream),
+) -> Result<()> {
+    let req = recv
+        .read_to_end(64 * 1024)
+        .await
+        .map_err(|e| anyhow!("failed reading request: {}", e))?;
+    let mut escaped = String::new();
+    for &x in &req[..] {
+        let part = ascii::escape_default(x).collect::<Vec<_>>();
+        escaped.push_str(str::from_utf8(&part).unwrap());
+    }
+    info!(content = %escaped);
+    // Execute the request
+    let resp = process_get(&root, &req).unwrap_or_else(|e| {
+        error!("failed: {}", e);
+        format!("failed to process request: {e}\n").into_bytes()
+    });
+    // Write the response
+    send.write_all(&resp)
+        .await
+        .map_err(|e| anyhow!("failed to send response: {}", e))?;
+    // Gracefully terminate the stream
+    send.finish().unwrap();
+    info!("complete");
+    Ok(())
+}
+
+fn process_get(root: &Path, x: &[u8]) -> Result<Vec<u8>> {
+    if x.len() < 4 || &x[0..4] != b"GET " {
+        bail!("missing GET");
+    }
+    if x[4..].len() < 2 || &x[x.len() - 2..] != b"\r\n" {
+        bail!("missing \\r\\n");
+    }
+    let x = &x[4..x.len() - 2];
+    let end = x.iter().position(|&c| c == b' ').unwrap_or(x.len());
+    let path = str::from_utf8(&x[..end]).context("path is malformed UTF-8")?;
+    let path = Path::new(&path);
+    let mut real_path = PathBuf::from(root);
+    let mut components = path.components();
+    match components.next() {
+        Some(path::Component::RootDir) => {}
+        _ => {
+            bail!("path must be absolute");
+        }
+    }
+    for c in components {
+        match c {
+            path::Component::Normal(x) => {
+                real_path.push(x);
+            }
+            x => {
+                bail!("illegal component in path: {:?}", x);
+            }
+        }
+    }
+    let data = fs::read(&real_path).context("failed reading file")?;
+    Ok(data)
+}