1 // Copyright 2021 Ian Jackson and contributors to Hippotat
2 // SPDX-License-Identifier: GPL-3.0-or-later
3 // There is NO WARRANTY.
5 use hippotat::prelude::*;
11 pub use sweb::{WebRequest, WebResponse, WebResponseBody};
14 #[derive(StructOpt,Debug)]
20 pub config: config::Opts,
23 pub const METADATA_MAX_LEN: usize = MAX_OVERHEAD;
26 // ----- Backpressure discussion -----
28 // These two kinds of channels are sent blockingly, so this means the
29 // task which calls route_packet can get this far ahead, before a
30 // context switch to the receiving task is forced.
31 pub const MAXQUEUE_ROUTE2USER: usize = 15;
32 pub const MAXQUEUE_ROUTE2LOCAL: usize = 50;
34 // This channel is sent with try_send, ie non-blocking. If the user
35 // task becomes overloaded, requests will start to be rejected.
36 pub const MAXQUEUE_WEBREQ2USER: usize = 5;
38 // The user task prioritises 1. returning requests or discarding data,
39 // 2. handling data routed to it. Ie it prefers to drain queues.
41 // The slocal task prioritises handling routed data and writing it
42 // (synchronously) to the local kernel. So if the local kernel starts
43 // blocking, all tasks may end up blocked waiting for things to drain.
48 config: config::InstanceConfigGlobal,
49 local_rx: mpsc::Sender<RoutedPacket>,
50 all_clients: HashMap<ClientName, User>,
53 pub struct RoutedPacket {
54 pub data: RoutedPacketData,
55 // pub source: Option<ClientName>, // for eh, tracing, etc.
58 // not MIME data, valid SLIP (checked)
59 pub type RoutedPacketData = Box<[u8]>;
62 // we don't decrement the ttl (naughty) but loops cannot arise
63 // because only the server has any routing code, and server
64 // has no internal loops, so worst case is
65 // client if -> client -> server -> client' -> client if'
66 // and the ifs will decrement the ttl.
68 #[derive(Clone,Debug)]
69 pub struct MayRoute(());
71 pub fn came_from_outside_hippotatd() -> Self { Self(()) }
74 pub use may_route::MayRoute;
76 pub async fn route_packet(global: &Global,
77 transport_conn: &str, source: Option<&ClientName>,
78 packet: RoutedPacketData, daddr: IpAddr,
81 let c = &global.config;
82 let len = packet.len();
83 let trace = |how: &str, why: &str| {
84 trace!("{} to={:?} came=={} user={} len={} {}",
85 how, daddr, transport_conn,
87 Some(s) => s as &dyn Display,
94 if daddr == c.vaddr || ! c.vnetwork.iter().any(|n| n.contains(&daddr)) {
95 (Some(&global.local_rx), "via=local")
96 } else if daddr == c.vrelay {
98 } else if let Some(client) = global.all_clients.get(&ClientName(daddr)) {
99 (Some(&client.route), "via=client")
104 let dest = if let Some(d) = dest { d } else {
105 trace("discard ", why); return;
108 let packet = RoutedPacket {
110 // source: source.cloned(),
112 match dest.send(packet).await {
113 Ok(()) => trace("forward", why),
114 Err(_) => trace("task-crashed!", why),
120 let opts = Opts::from_args();
127 "hippotatd", LinkEnd::Server,
128 &opts.config, &opts.log, |ics|
130 let global_config = config::InstanceConfigGlobal::from(&ics);
132 let ipif = Ipif::start(&global_config.ipif, None)?;
134 let ics = ics.into_iter().map(Arc::new).collect_vec();
135 let (client_handles_send, client_handles_recv) = ics.iter()
137 let (web_send, web_recv) = mpsc::channel(
140 let (route_send, route_recv) = mpsc::channel(
143 ((web_send, route_send), (web_recv, route_recv))
144 }).unzip::<_,_,Vec<_>,Vec<_>>();
146 let all_clients = izip!(
149 ).map(|(ic, (web_send, route_send))| {
158 let (local_rx_send, local_tx_recv) = mpsc::channel(
162 let global = Arc::new(Global {
163 config: global_config,
164 local_rx: local_rx_send,
168 for (ic, (web_recv, route_recv)) in izip!(
172 let global_ = global.clone();
173 let ic_ = ic.clone();
174 tasks.push((tokio::spawn(async move {
175 suser::run(global_, ic_, web_recv, route_recv)
176 .await.void_unwrap_err()
177 }), format!("client {}", &ic)));
180 for addr in &global.config.addrs {
181 let global_ = global.clone();
182 let make_service = hyper::service::make_service_fn(
183 move |conn: &hyper::server::conn::AddrStream| {
184 let global_ = global_.clone();
185 let conn = Arc::new(format!("[{}]", conn.remote_addr()));
186 async { Ok::<_, Void>( hyper::service::service_fn(move |req| {
188 sweb::handle(conn.clone(), global_.clone(), req)
191 .map(|r| r.unwrap_or_else(|_|{
192 crash(Err("panicked".into()), "webserver request task")
198 let addr = SocketAddr::new(*addr, global.config.port);
199 let server = hyper::Server::try_bind(&addr)
201 .http1_preserve_header_case(true)
202 .serve(make_service);
203 info!("listening on {}", &addr);
204 let task = tokio::task::spawn(async move {
206 Ok(()) => anyhow!("shut down?!"),
210 tasks.push((task, format!("http server {}", addr)));
213 let global_ = global.clone();
214 let ipif = tokio::task::spawn(async move {
215 slocal::run(global_, local_tx_recv, ipif).await
218 tasks.push((ipif, format!("ipif")));
223 let (output, died_i, _) = future::select_all(
224 tasks.iter_mut().map(|e| &mut e.0)
227 let task = &tasks[died_i].1;
228 let output = output.map_err(|je| je.to_string());
232 pub fn crash(what_happened: Result<AE, String>, task: &str) -> ! {
233 match what_happened {
234 Err(je) => error!("task crashed! {}: {}", task, &je),
235 Ok(e) => error!("task failed! {}: {}", task, &e ),