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use std::sync::Arc;
use std::io::{BufRead, BufReader, Write};
use std::net::TcpStream;
use rustls::RootCertStore;
fn start_connection(config: &Arc<rustls::ClientConfig>, domain_name: &str) {
let server_name = domain_name
.try_into()
.expect("invalid DNS name");
let mut conn = rustls::ClientConnection::new(Arc::clone(config), server_name).unwrap();
let mut sock = TcpStream::connect(format!("{}:443", domain_name)).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 root_store = RootCertStore::empty();
for cert in rustls_native_certs::load_native_certs().expect("could not load platform certs") {
root_store
.add(&rustls::Certificate(cert.to_vec()))
.expect("could not add certificate");
}
let mut config = rustls::ClientConfig::builder()
.with_safe_defaults()
.with_root_certificates(root_store)
.with_no_client_auth();
// 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, "jbp.io");
println!("* Sending second request:");
start_connection(&config, "jbp.io");
}
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