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::*;
7 #[derive(StructOpt,Debug)]
16 const METADATA_MAX_LEN: usize = MAX_OVERHEAD;
18 type AllClients = HashMap<ClientName, ClientHandles>;
20 struct ClientHandles {
21 ic: Arc<InstanceConfig>,
22 web: tokio::sync::mpsc::Sender<WebRequest>,
25 /// Sent from hyper worker pool task to client task
26 #[allow(dead_code)] // xxx
29 // initial part of body
30 // used up to and including first 2 lines of metadata
31 // end delimiter for the metadata not yet located, but in here somewhere
33 initial_remaining: usize,
35 body: hyper::body::Body,
36 boundary_finder: multipart::BoundaryFinder,
37 reply_to: tokio::sync::oneshot::Sender<WebResponse>,
41 /// Reply from client task to hyper worker pool task
42 #[allow(dead_code)] // xxx
46 data: Result<WebResponseData, AE>,
49 type WebResponseData = Vec<u8>;
51 #[throws(PacketError)]
52 pub fn route_packet(packet: Box<[u8]>, daddr: IpAddr) {
53 trace!("xxx discarding packet daddr={:?} len={}", daddr, packet.len());
58 all_clients: Arc<AllClients>,
59 req: hyper::Request<hyper::Body>
60 ) -> Result<hyper::Response<hyper::Body>, hyper::http::Error> {
61 if req.method() == Method::GET {
62 let mut resp = hyper::Response::new(hyper::Body::from("hippotat\r\n"));
63 resp.headers_mut().insert(
65 "text/plain; charset=US-ASCII".try_into().unwrap()
70 let mut warnings: Warnings = default();
74 let get_header = |hn: &str| {
75 let mut values = req.headers().get_all(hn).iter();
76 let v = values.next().ok_or_else(|| anyhow!("missing {}", hn))?;
77 if values.next().is_some() { throw!(anyhow!("multiple {}!", hn)); }
78 let v = v.to_str().context(anyhow!("interpret {} as UTF-8", hn))?;
82 let mkboundary = |b: &'_ _| format!("\n--{}", b).into_bytes();
83 let boundary = match (||{
84 let t = get_header("Content-Type")?;
85 let t: mime::Mime = t.parse().context("parse Content-Type")?;
86 if t.type_() != "multipart" { throw!(anyhow!("not multipart/")) }
87 let b = mime::BOUNDARY;
88 let b = t.get_param(b).ok_or_else(|| anyhow!("missing boundary=..."))?;
89 if t.subtype() != "form-data" {
90 warnings.add(&"Content-Type not /form-data")?;
92 let b = mkboundary(b.as_str());
97 warnings.add(&e.wrap_err("guessing boundary"))?;
102 let length_hint: usize = (||{
103 let clength = get_header("Content-Length")?;
104 let clength = clength.parse().context("parse Content-Length")?;
107 |e| { let _ = warnings.add(&e.wrap_err("parsing Content-Length")); 0 }
110 let mut body = req.into_body();
111 let initial = match read_limited_bytes(
112 METADATA_MAX_LEN, default(), length_hint, &mut body
115 Err(ReadLimitedError::Truncated { sofar,.. }) => sofar,
116 Err(ReadLimitedError::Hyper(e)) => throw!(e),
119 let boundary_finder = memmem::Finder::new(&boundary);
120 let mut boundary_iter = boundary_finder.find_iter(&initial);
122 let start = if initial.starts_with(&boundary[1..]) { boundary.len()-1 }
123 else if let Some(start) = boundary_iter.next() { start + boundary.len() }
124 else { throw!(anyhow!("initial boundary not found")) };
126 let comp = multipart::process_boundary
127 (&mut warnings, &initial[start..], PartName::m)?
128 .ok_or_else(|| anyhow!(r#"no "m" component"#))?;
130 if comp.name != PartName::m { throw!(anyhow!(
131 r#"first multipart component must be name="m""#
134 let mut meta = MetadataFieldIterator::new(comp.payload);
136 let client: ClientName = meta.need_parse().context("client addr")?;
138 let mut hmac_got = [0; HMAC_L];
139 let (client_time, hmac_got_l) = (||{
140 let token: &str = meta.need_next().context(r#"find in "m""#)?;
141 let (time_t, hmac_b64) = token.split_once(' ')
142 .ok_or_else(|| anyhow!("split"))?;
143 let time_t = u64::from_str_radix(time_t, 16).context("parse time_t")?;
145 &mut base64::read::DecoderReader::new(&mut hmac_b64.as_bytes(),
147 &mut &mut hmac_got[..]
148 ).context("parse b64 token")?;
149 let l = l.try_into()?;
150 Ok::<_,AE>((time_t, l))
151 })().context("token")?;
152 let hmac_got = &hmac_got[0..hmac_got_l];
154 let client_name = client;
155 let client = all_clients.get(&client_name);
157 // We attempt to hide whether the client exists we don't try to
158 // hide the hash lookup computationgs, but we do try to hide the
159 // HMAC computation by always doing it. We hope that the compiler
160 // doesn't produce a specialised implementation for the dummy
162 let client_exists = subtle::Choice::from(client.is_some() as u8);
163 let secret = client.map(|c| c.ic.secret.0.as_bytes());
164 let secret = secret.unwrap_or(&[0x55; HMAC_B][..]);
165 let client_time_s = format!("{:x}", client_time);
166 let hmac_exp = token_hmac(secret, client_time_s.as_bytes());
167 // We also definitely want a consttime memeq for the hmac value
168 let hmac_ok = hmac_got.ct_eq(&hmac_exp);
169 //dbg!(DumpHex(&hmac_exp), client.is_some());
170 //dbg!(DumpHex(hmac_got), hmac_ok, client_exists);
171 if ! bool::from(hmac_ok & client_exists) {
172 debug!("{} rejected client {}", &conn, &client_name);
173 let body = hyper::Body::from("Not authorised\r\n");
175 hyper::Response::builder()
176 .status(hyper::StatusCode::FORBIDDEN)
177 .header("Content-Type", r#"text/plain; charset="utf-8""#)
182 let client = client.unwrap();
183 let now = time_t_now();
184 let chk_skew = |a: u64, b: u64, c_ahead_behind| {
185 if let Some(a_ahead) = a.checked_sub(b) {
186 if a_ahead > client.ic.max_clock_skew.as_secs() {
187 throw!(anyhow!("too much clock skew (client {} by {})",
188 c_ahead_behind, a_ahead));
193 chk_skew(client_time, now, "ahead")?;
194 chk_skew(now, client_time, "behind")?;
196 let initial_remaining = meta.remaining_bytes_len();
198 //eprintln!("boundary={:?} start={} name={:?} client={}",
199 // boundary, start, &comp.name, &client.ic);
201 let (reply_to, reply_recv) = tokio::sync::oneshot::channel();
202 trace!("{} request xxx={}", &client.ic, initial.len());
203 let wreq = WebRequest {
207 boundary_finder: boundary_finder.into_owned(),
209 warnings: mem::take(&mut warnings),
213 client.web.try_send(wreq)
214 .map_err(|_| anyhow!("client task shut down!"))?;
216 let reply: WebResponse = reply_recv.await?;
217 warnings = reply.warnings;
218 let data = reply.data?;
220 if ! warnings.warnings.is_empty()
221 && log::log_enabled!(log::Level::Trace) {
222 trace!("{} {}: warnings {:?}", &conn, &client_name, &warnings.warnings);
225 let data = hyper::Body::from(data);
227 hyper::Response::builder()
228 .header("Content-Type", r#"application/octet-stream"#)
231 }.await.unwrap_or_else(|e| {
232 debug!("{} error {}", &conn, &e);
233 let mut errmsg = format!("ERROR\n\n{:?}\n\n", &e);
234 for w in warnings.warnings {
235 write!(errmsg, "warning: {}\n", w).unwrap();
237 hyper::Response::builder()
238 .status(hyper::StatusCode::BAD_REQUEST)
239 .header("Content-Type", r#"text/plain; charset="utf-8""#)
244 #[allow(unused_variables)] // xxx
245 #[allow(unused_mut)] // xxx
246 async fn run_client(ic: Arc<InstanceConfig>,
247 mut web: mpsc::Receiver<WebRequest>)
251 reply_to: tokio::sync::oneshot::Sender<WebResponse>,
252 oi: OutstandingInner,
255 struct OutstandingInner {
256 target_requests_outstanding: u32,
258 let mut outstanding: VecDeque<Outstanding> = default();
259 let downbound: VecDeque<(/*xxx*/)> = default();
261 let try_send_response = |
262 reply_to: tokio::sync::oneshot::Sender<WebResponse>,
263 response: WebResponse
265 reply_to.send(response)
266 .unwrap_or_else(|_: WebResponse| () /* oh dear */ /* xxx trace? */);
271 if ! downbound.is_empty() {
272 outstanding.pop_front()
273 } else if let Some((i,_)) = outstanding.iter().enumerate().find({
274 |(_,o)| outstanding.len() > o.oi.target_requests_outstanding.sat()
276 Some(outstanding.remove(i).unwrap())
281 let response = WebResponse {
282 data: Ok(vec![ /* xxx */ ]),
287 try_send_response(ret.reply_to, response);
294 initial, initial_remaining, length_hint, mut body,
296 reply_to, mut warnings,
297 } = req.ok_or_else(|| anyhow!("webservers all shut down!"))?;
301 let initial_used = initial.len() - initial_remaining;
303 let whole_request = read_limited_bytes(
304 ic.max_batch_up.sat(),
308 ).await.context("read request body")?;
310 let (meta, mut comps) =
311 multipart::ComponentIterator::resume_mid_component(
312 &whole_request[initial_used..],
314 ).context("resume parsing body, after auth checks")?;
316 let mut meta = MetadataFieldIterator::new(&meta);
319 { $v:ident, ( $( $badcmp:tt )? ), $ret:expr,
320 let $server:ident, $client:ident $($code:tt)*
324 let $client $($code)*
326 if $client $badcmp $server {
327 throw!(anyhow!("mismatch: client={:?} {} server={:?}",
328 $client, stringify!($badcmp), $server));
332 })().context(stringify!($v))?;
338 target_requests_outstanding, ( != ), client,
339 let server, client: u32 = meta.need_parse()?;
343 http_timeout, ( > ), client,
344 let server, client = Duration::from_secs(meta.need_parse()?);
349 let server, client: u32 = meta.parse()?.unwrap_or(server);
353 max_batch_down, (), min(client, server),
354 let server, client: u32 = meta.parse()?.unwrap_or(server);
358 max_batch_up, ( > ), client,
359 let server, client = meta.parse()?.unwrap_or(server);
362 while let Some(comp) = comps.next(&mut warnings, PartName::d)? {
363 if comp.name != PartName::d {
364 warnings.add(&format_args!("unexpected part {:?}", comp.name))?;
366 checkn(Mime2Slip, mtu, comp.payload, |header| {
367 let saddr = ip_packet_addr::<false>(header)?;
368 if saddr != ic.link.client.0 { throw!(PE::Src(saddr)) }
369 let daddr = ip_packet_addr::<true>(header)?;
371 }, |(daddr,packet)| route_packet(daddr,packet),
372 |e| Ok::<_,SlipFramesError<_>>({ warnings.add(&e)?; })
376 let oi = OutstandingInner {
377 target_requests_outstanding,
381 Ok(oi) => outstanding.push_back(Outstanding { reply_to, oi }),
383 try_send_response(reply_to, WebResponse {
392 //Err(anyhow!("xxx"))
397 let opts = Opts::from_args();
403 let (global, ipif) = config::startup(
404 "hippotatd", LinkEnd::Server,
405 &opts.config, &opts.log, |ics|
407 let global = config::InstanceConfigGlobal::from(&ics);
408 let ipif = Ipif::start(&global.ipif, None)?;
410 let all_clients: AllClients = ics.into_iter().map(|ic| {
411 let ic = Arc::new(ic);
413 let (web_send, web_recv) = mpsc::channel(
414 5 // xxx should me max_requests_outstanding but that's
415 // marked client-only so needs rework
418 let ic_ = ic.clone();
419 tasks.push((tokio::spawn(async move {
420 run_client(ic_, web_recv).await.void_unwrap_err()
421 }), format!("client {}", &ic)));
429 let all_clients = Arc::new(all_clients);
431 for addr in &global.addrs {
432 let all_clients_ = all_clients.clone();
433 let make_service = hyper::service::make_service_fn(move |conn| {
434 let all_clients_ = all_clients_.clone();
435 let conn = Arc::new(format!("[conn:{:?}]", conn));
436 async { Ok::<_, Void>( hyper::service::service_fn(move |req| {
437 handle(conn.clone(), all_clients_.clone(), req)
441 let addr = SocketAddr::new(*addr, global.port);
442 let server = hyper::Server::try_bind(&addr)
444 .http1_preserve_header_case(true)
445 .serve(make_service);
446 info!("listening on {}", &addr);
447 let task = tokio::task::spawn(async move {
449 Ok(()) => anyhow!("shut down?!"),
453 tasks.push((task, format!("http server {}", addr)));
459 let died = future::select_all(
460 tasks.iter_mut().map(|e| &mut e.0)
462 error!("xxx {:?}", &died);
464 ipif.quitting(None).await;