1 // Copyright 2021-2022 Ian Jackson and contributors to Hippotat
2 // SPDX-License-Identifier: GPL-3.0-or-later
3 // There is NO WARRANTY.
5 use hippotat::prelude::*;
12 pub use daemon::Daemoniser;
13 pub use sweb::{WebRequest, WebResponse, WebResponseBody};
16 #[derive(StructOpt,Debug)]
22 pub config: config::Opts,
29 pub const METADATA_MAX_LEN: usize = MAX_OVERHEAD;
32 // ----- Backpressure discussion -----
34 // These two kinds of channels are sent blockingly, so this means the
35 // task which calls route_packet can get this far ahead, before a
36 // context switch to the receiving task is forced.
37 pub const MAXQUEUE_ROUTE2USER: usize = 15;
38 pub const MAXQUEUE_ROUTE2LOCAL: usize = 50;
40 // This channel is sent with try_send, ie non-blocking. If the user
41 // task becomes overloaded, requests will start to be rejected.
42 pub const MAXQUEUE_WEBREQ2USER: usize = 5;
44 // The user task prioritises 1. returning requests or discarding data,
45 // 2. handling data routed to it. Ie it prefers to drain queues.
47 // The slocal task prioritises handling routed data and writing it
48 // (synchronously) to the local kernel. So if the local kernel starts
49 // blocking, all tasks may end up blocked waiting for things to drain.
54 config: config::InstanceConfigGlobal,
55 local_rx: mpsc::Sender<RoutedPacket>,
56 all_clients: HashMap<ClientName, User>,
59 pub struct RoutedPacket {
60 pub data: RoutedPacketData,
61 // pub source: Option<ClientName>, // for eh, tracing, etc.
64 // not MIME data, valid SLIP (checked)
65 pub type RoutedPacketData = Box<[u8]>;
68 // we don't decrement the ttl (naughty) but loops cannot arise
69 // because only the server has any routing code, and server
70 // has no internal loops, so worst case is
71 // client if -> client -> server -> client' -> client if'
72 // and the ifs will decrement the ttl.
74 #[derive(Clone,Debug)]
75 pub struct MayRoute(());
77 pub fn came_from_outside_hippotatd() -> Self { Self(()) }
80 pub use may_route::MayRoute;
82 pub async fn route_packet(global: &Global,
83 transport_conn: &str, source: Option<&ClientName>,
84 packet: RoutedPacketData, daddr: IpAddr,
87 let c = &global.config;
88 let len = packet.len();
89 let trace = |how: &str, why: &str| {
90 trace!("{} to={:?} came=={} user={} len={} {}",
91 how, daddr, transport_conn,
93 Some(s) => s as &dyn Display,
100 if daddr == c.vaddr || ! c.vnetwork.iter().any(|n| n.contains(&daddr)) {
101 (Some(&global.local_rx), "via=local")
102 } else if daddr == c.vrelay {
104 } else if let Some(client) = global.all_clients.get(&ClientName(daddr)) {
105 (Some(&client.route), "via=client")
110 let dest = if let Some(d) = dest { d } else {
111 trace("discard ", why); return;
114 let packet = RoutedPacket {
116 // source: source.cloned(),
118 match dest.send(packet).await {
119 Ok(()) => trace("forward", why),
120 Err(_) => trace("task-crashed!", why),
125 let opts = Opts::from_args();
126 let daemon = if opts.daemon {
127 Some(Daemoniser::phase1())
132 async_main(opts, daemon);
136 async fn async_main(opts: Opts, daemon: Option<Daemoniser>) {
143 "hippotatd", LinkEnd::Server,
144 &opts.config, &opts.log, |ics|
146 let global_config = config::InstanceConfigGlobal::from(&ics);
148 let ipif = Ipif::start(&global_config.ipif, None)?;
150 let ics = ics.into_iter().map(Arc::new).collect_vec();
151 let (client_handles_send, client_handles_recv) = ics.iter()
153 let (web_send, web_recv) = mpsc::channel(
156 let (route_send, route_recv) = mpsc::channel(
159 ((web_send, route_send), (web_recv, route_recv))
160 }).unzip::<_,_,Vec<_>,Vec<_>>();
162 let all_clients = izip!(
165 ).map(|(ic, (web_send, route_send))| {
174 let (local_rx_send, local_tx_recv) = mpsc::channel(
178 let global = Arc::new(Global {
179 config: global_config,
180 local_rx: local_rx_send,
184 for (ic, (web_recv, route_recv)) in izip!(
188 let global_ = global.clone();
189 let ic_ = ic.clone();
190 tasks.push((tokio::spawn(async move {
191 suser::run(global_, ic_, web_recv, route_recv)
192 .await.void_unwrap_err()
193 }), format!("client {}", &ic)));
196 for addr in &global.config.addrs {
197 let global_ = global.clone();
198 let make_service = hyper::service::make_service_fn(
199 move |conn: &hyper::server::conn::AddrStream| {
200 let global_ = global_.clone();
201 let conn = Arc::new(format!("[{}]", conn.remote_addr()));
202 async { Ok::<_, Void>( hyper::service::service_fn(move |req| {
204 sweb::handle(conn.clone(), global_.clone(), req)
207 .map(|r| r.unwrap_or_else(|_|{
208 crash(Err("panicked".into()), "webserver request task")
214 let addr = SocketAddr::new(*addr, global.config.port);
215 let server = hyper::Server::try_bind(&addr)
217 .http1_preserve_header_case(true)
218 .serve(make_service);
219 info!("listening on {}", &addr);
220 let task = tokio::task::spawn(async move {
222 Ok(()) => anyhow!("shut down?!"),
226 tasks.push((task, format!("http server {}", addr)));
229 let global_ = global.clone();
230 let ipif = tokio::task::spawn(async move {
231 slocal::run(global_, local_tx_recv, ipif).await
234 tasks.push((ipif, format!("ipif")));
239 if let Some(daemon) = daemon {
243 let (output, died_i, _) = future::select_all(
244 tasks.iter_mut().map(|e| &mut e.0)
247 let task = &tasks[died_i].1;
248 let output = output.map_err(|je| je.to_string());
252 pub fn crash(what_happened: Result<AE, String>, task: &str) -> ! {
253 match what_happened {
254 Err(je) => error!("task crashed! {}: {}", task, &je),
255 Ok(e) => error!("task failed! {}: {}", task, &e ),