third_party/rust_crates/forks/rustls/examples/simpleclient.rs

/// This is the simplest possible client using rustls that does something useful:
/// it accepts the default configuration, loads some root certs, and then connects
/// to google.com and issues a basic HTTP request.  The response is printed to stdout.
///
/// It makes use of rustls::Stream to treat the underlying TLS session as a basic
/// bi-directional stream -- the underlying IO is performed transparently.
///
/// Note that `unwrap()` is used to deal with networking errors; this is not something
/// that is sensible outside of example code.
use std::sync::Arc;

use std::io::{stdout, Read, Write};
use std::net::TcpStream;

use rustls;
use webpki;
use webpki_roots;

use rustls::Session;

fn main() {
    let mut config = rustls::ClientConfig::new();
    config
        .root_store
        .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);

    let dns_name = webpki::DNSNameRef::try_from_ascii_str("google.com").unwrap();
    let mut sess = rustls::ClientSession::new(&Arc::new(config), dns_name);
    let mut sock = TcpStream::connect("google.com:443").unwrap();
    let mut tls = rustls::Stream::new(&mut sess, &mut sock);
    tls.write(
        concat!(
            "GET / HTTP/1.1\r\n",
            "Host: google.com\r\n",
            "Connection: close\r\n",
            "Accept-Encoding: identity\r\n",
            "\r\n"
        )
        .as_bytes(),
    )
    .unwrap();
    let ciphersuite = tls
        .sess
        .get_negotiated_ciphersuite()
        .unwrap();
    writeln!(
        &mut std::io::stderr(),
        "Current ciphersuite: {:?}",
        ciphersuite.suite
    )
    .unwrap();
    let mut plaintext = Vec::new();
    tls.read_to_end(&mut plaintext).unwrap();
    stdout().write_all(&plaintext).unwrap();
}