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//! This is an example client that uses rustls for TLS, and sends early 0-RTT data.
//!
//! Usage: cargo r --bin simple_0rtt_client --package rustls-examples [domain name] [port] [path/to/ca.cert]
//!
//! You may set the `SSLKEYLOGFILE` env var when using this example to write a
//! log file with key material (insecure) for debugging purposes. See [`rustls::KeyLog`]
//! for more information.
//!
//! Note that `unwrap()` is used to deal with networking errors; this is not something
//! that is sensible outside of example code.
use std::io::{BufRead, BufReader, Write};
use std::net::TcpStream;
use std::str::FromStr;
use std::sync::Arc;
use std::{env, fs};
use rustls::pki_types::ServerName;
use rustls::RootCertStore;
fn start_connection(config: &Arc<rustls::ClientConfig>, domain_name: &str, port: u16) {
let server_name = ServerName::try_from(domain_name)
.expect("invalid DNS name")
.to_owned();
let mut conn = rustls::ClientConnection::new(Arc::clone(config), server_name).unwrap();
let mut sock = TcpStream::connect(format!("{}:{}", domain_name, port)).unwrap();
sock.set_nodelay(true).unwrap();
let request = format!(
"GET / HTTP/1.1\r\n\
Host: {}\r\n\
Connection: close\r\n\
Accept-Encoding: identity\r\n\
\r\n",
domain_name
);
// If early data is available with this server, then early_data()
// will yield Some(WriteEarlyData) and WriteEarlyData implements
// io::Write. Use this to send the request.
if let Some(mut early_data) = conn.early_data() {
early_data
.write_all(request.as_bytes())
.unwrap();
println!(" * 0-RTT request sent");
}
let mut stream = rustls::Stream::new(&mut conn, &mut sock);
// Complete handshake.
stream.flush().unwrap();
// If we didn't send early data, or the server didn't accept it,
// then send the request as normal.
if !stream.conn.is_early_data_accepted() {
stream
.write_all(request.as_bytes())
.unwrap();
println!(" * Normal request sent");
} else {
println!(" * 0-RTT data accepted");
}
let mut first_response_line = String::new();
BufReader::new(stream)
.read_line(&mut first_response_line)
.unwrap();
println!(" * Server response: {:?}", first_response_line);
}
fn main() {
env_logger::init();
let mut args = env::args();
args.next();
let domain_name = args
.next()
.unwrap_or("jbp.io".to_owned());
let port = args
.next()
.map(|port| u16::from_str(&port).expect("invalid port"))
.unwrap_or(443);
let mut root_store = RootCertStore::empty();
if let Some(cafile) = args.next() {
let certfile = fs::File::open(cafile).expect("Cannot open CA file");
let mut reader = BufReader::new(certfile);
root_store.add_parsable_certificates(
rustls_pemfile::certs(&mut reader).map(|result| result.unwrap()),
);
} else {
root_store.extend(
webpki_roots::TLS_SERVER_ROOTS
.iter()
.cloned(),
)
}
let mut config = rustls::ClientConfig::builder()
.with_root_certificates(root_store)
.with_no_client_auth();
// Allow using SSLKEYLOGFILE.
config.key_log = Arc::new(rustls::KeyLogFile::new());
// Enable early data.
config.enable_early_data = true;
let config = Arc::new(config);
// Do two connections. The first will be a normal request, the
// second will use early data if the server supports it.
println!("* Sending first request:");
start_connection(&config, &domain_name, port);
println!("* Sending second request:");
start_connection(&config, &domain_name, port);
}
|
