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Connections: Track, send, receive 

Signed-off-by: Luca Fulchir <luca.fulchir@runesauth.com>
This commit is contained in:
Luca Fulchir 2023-07-06 10:48:18 +02:00
parent 9ca4123c37
commit 4ddfed358d
Signed by: luca.fulchir
GPG Key ID: 8F6440603D13A78E
5 changed files with 281 additions and 92 deletions
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6
TODO
View File

@ -1,4 +1,6 @@
* Wrapping for everything that wraps (sigh)
* track user connection (add u64 from user)
* split API in LocalThread and ThreadSafe
* split send/recv API in Centralized, Decentralized
* API plit
* split API in ThreadLocal, ThreadSafe
* split send/recv API in Centralized, Connection
* all re wrappers on ThreadLocal-Centralized

163
src/connection/mod.rs
View File

@ -7,7 +7,7 @@ pub mod stream;
use ::core::num::Wrapping;
use ::std::{
collections::{BTreeMap, HashMap},
collections::{BTreeMap, HashMap, VecDeque},
vec::Vec,
};
@ -26,14 +26,21 @@ use crate::{
inner::{worker, ThreadTracker},
};
/// Connaction errors
/// Connection errors
#[derive(::thiserror::Error, Debug, Copy, Clone)]
pub(crate) enum Error {
pub enum Error {
/// Can't decrypt packet
#[error("Decrypt error: {0}")]
Decrypt(#[from] crate::enc::Error),
/// Error in parsing a packet realated to the connection
#[error("Chunk parsing: {0}")]
Parse(#[from] stream::Error),
/// No such Connection
#[error("No suck connection")]
NoSuchConnection,
/// No such Stream
#[error("No suck Stream")]
NoSuchStream,
}
/// Fenrir Connection ID
@ -141,32 +148,53 @@ impl ProtocolVersion {
}
}
/// Connection tracking id. Set by the user
#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd)]
pub struct UserTracker(pub ::core::num::NonZeroU64);
/// Unique tracker of connections
#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd)]
pub struct ConnTracker(Wrapping<u64>);
impl ConnTracker {
pub struct LibTracker(Wrapping<u64>);
impl LibTracker {
pub(crate) fn new(start: u16) -> Self {
Self(Wrapping(start as u64))
}
pub(crate) fn advance(&mut self, amount: u16) -> Self {
let old = self.0;
self.0 = self.0 + Wrapping(amount as u64);
ConnTracker(old)
LibTracker(old)
}
}
/// Collection of connection tracking, but user-given and library generated
#[derive(Debug, Copy, Clone)]
pub struct ConnTracker {
/// Optional tracker set by the user
pub user: Option<UserTracker>,
/// library generated tracker. Unique and non-repeating
pub(crate) lib: LibTracker,
}
impl PartialEq for ConnTracker {
fn eq(&self, other: &Self) -> bool {
self.lib == other.lib
}
}
impl Eq for ConnTracker {}
/// Connection to an Authentication Server
#[derive(Debug)]
pub struct AuthSrvConn(pub Conn);
#[derive(Debug, Copy, Clone)]
pub struct AuthSrvConn(pub ConnTracker);
/// Connection to a service
#[derive(Debug)]
pub struct ServiceConn(pub Conn);
#[derive(Debug, Copy, Clone)]
pub struct ServiceConn(pub ConnTracker);
/*
* TODO: only on Thread{Local,Safe}::Connection oriented flows
/// The connection, as seen from a user of libFenrir
#[derive(Debug)]
pub struct Conn {
pub(crate) queue: ::async_channel::Sender<worker::Work>,
pub(crate) fast: ConnTracker,
pub(crate) tracker: ConnTracker,
}
impl Conn {
@ -176,14 +204,15 @@ impl Conn {
use crate::inner::worker::Work;
let _ = self
.queue
.send(Work::UserSend((self.tracker(), stream, data)))
.send(Work::UserSend((self.tracker.lib, stream, data)))
.await;
}
/// Get the library tracking id
pub fn tracker(&self) -> ConnTracker {
self.fast
self.tracker
}
}
*/
/// Role: track the connection direction
///
@ -208,15 +237,10 @@ enum TimerKind {
}
pub(crate) enum Enqueue {
NoSuchStream,
TimerWait,
Immediate(::tokio::time::Instant),
}
/// Connection tracking id. Set by the user
#[derive(Debug, Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
pub struct UserTracker(pub ::core::num::NonZeroU64);
/// A single connection and its data
#[derive(Debug)]
pub(crate) struct Connection {
@ -227,6 +251,7 @@ pub(crate) struct Connection {
/// User-managed id to track this connection
/// the user can set this to better track this connection
pub(crate) user_tracker: Option<UserTracker>,
pub(crate) lib_tracker: LibTracker,
/// Sending address
pub(crate) send_addr: UdpClient,
/// The main hkdf used for all secrets in this connection
@ -242,6 +267,7 @@ pub(crate) struct Connection {
last_stream_sent: stream::ID,
/// receive queue for each Stream
recv_queue: BTreeMap<stream::ID, stream::Stream>,
streams_ready: VecDeque<stream::ID>,
}
impl Connection {
@ -267,6 +293,7 @@ impl Connection {
id_recv: IDRecv(ID::Handshake),
id_send: IDSend(ID::Handshake),
user_tracker: None,
lib_tracker: LibTracker::new(0),
// will be overwritten
send_addr: UdpClient(SocketAddr::new(
IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
@ -280,8 +307,24 @@ impl Connection {
send_queue: BTreeMap::new(),
last_stream_sent: stream::ID(0),
recv_queue: BTreeMap::new(),
streams_ready: VecDeque::with_capacity(4),
}
}
pub(crate) fn get_data(&mut self) -> Option<Vec<(stream::ID, Vec<u8>)>> {
if self.streams_ready.is_empty() {
return None;
}
let ret_len = self.streams_ready.len();
let mut ret = Vec::with_capacity(ret_len);
while let Some(stream_id) = self.streams_ready.pop_front() {
let stream = match self.recv_queue.get_mut(&stream_id) {
Some(stream) => stream,
None => continue,
};
ret.push((stream_id, stream.get()));
}
Some(ret)
}
pub(crate) fn recv(
&mut self,
mut udp: crate::RawUdp,
@ -316,7 +359,12 @@ impl Connection {
}
};
match stream.recv(chunk) {
Ok(status) => data_ready = data_ready | status,
Ok(status) => {
if !self.streams_ready.contains(&stream_id) {
self.streams_ready.push_back(stream_id);
}
data_ready = data_ready | status;
}
Err(e) => ::tracing::debug!("stream: {:?}: {:?}", stream_id, e),
}
}
@ -326,9 +374,9 @@ impl Connection {
&mut self,
stream: stream::ID,
data: Vec<u8>,
) -> Enqueue {
) -> Result<Enqueue, Error> {
let stream = match self.send_queue.get_mut(&stream) {
None => return Enqueue::NoSuchStream,
None => return Err(Error::NoSuchStream),
Some(stream) => stream,
};
stream.enqueue(data);
@ -348,7 +396,7 @@ impl Connection {
TimerKind::SendData(old_timer)
}
};
ret
Ok(ret)
}
pub(crate) fn write_pkt<'a>(
&mut self,
@ -426,8 +474,8 @@ impl Connection {
pub(crate) struct ConnList {
thread_id: ThreadTracker,
connections: Vec<Option<Connection>>,
user_tracker: BTreeMap<ConnTracker, usize>,
last_tracked: ConnTracker,
user_tracker: BTreeMap<LibTracker, usize>,
last_tracked: LibTracker,
/// Bitmap to track which connection ids are used or free
ids_used: Vec<::bitmaps::Bitmap<1024>>,
}
@ -444,32 +492,40 @@ impl ConnList {
thread_id,
connections: Vec::with_capacity(INITIAL_CAP),
user_tracker: BTreeMap::new(),
last_tracked: ConnTracker(Wrapping(0)),
last_tracked: LibTracker(Wrapping(0)),
ids_used: vec![bitmap_id],
};
ret.connections.resize_with(INITIAL_CAP, || None);
ret
}
pub fn get_id_mut(&mut self, id: ID) -> Option<&mut Connection> {
pub fn get_id_mut(&mut self, id: ID) -> Result<&mut Connection, Error> {
let conn_id = match id {
ID::Handshake => {
return None;
}
ID::ID(conn_id) => conn_id,
ID::Handshake => {
return Err(Error::NoSuchConnection);
}
};
let id_in_thread: usize =
(conn_id.get() / (self.thread_id.total as u64)) as usize;
(&mut self.connections[id_in_thread]).into()
if let Some(conn) = &mut self.connections[id_in_thread] {
Ok(conn)
} else {
return Err(Error::NoSuchConnection);
}
pub fn get_mut(&mut self, tracker: ConnTracker) -> Option<&mut Connection> {
}
pub fn get_mut(
&mut self,
tracker: LibTracker,
) -> Result<&mut Connection, Error> {
let idx = if let Some(idx) = self.user_tracker.get(&tracker) {
*idx
} else {
return None;
return Err(Error::NoSuchConnection);
};
match &mut self.connections[idx] {
None => None,
Some(conn) => Some(conn),
if let Some(conn) = &mut self.connections[idx] {
Ok(conn)
} else {
return Err(Error::NoSuchConnection);
}
}
pub fn len(&self) -> usize {
@ -481,7 +537,23 @@ impl ConnList {
}
/// Only *Reserve* a connection,
/// without actually tracking it in self.connections
pub(crate) fn reserve_and_track<'a>(
&'a mut self,
mut conn: Connection,
) -> (LibTracker, &'a mut Connection) {
let (id_conn, id_in_thread) = self.reserve_first_with_idx();
conn.id_recv = id_conn;
let tracker = self.get_new_tracker(id_in_thread);
conn.lib_tracker = tracker;
self.connections[id_in_thread] = Some(conn);
(tracker, self.connections[id_in_thread].as_mut().unwrap())
}
/// Only *Reserve* a connection,
/// without actually tracking it in self.connections
pub(crate) fn reserve_first(&mut self) -> IDRecv {
self.reserve_first_with_idx().0
}
fn reserve_first_with_idx(&mut self) -> (IDRecv, usize) {
// uhm... bad things are going on here:
// * id must be initialized, but only because:
// * rust does not understand that after the `!found` id is always
@ -519,13 +591,13 @@ impl ConnList {
let actual_id = ((id_in_thread as u64) * (self.thread_id.total as u64))
+ (self.thread_id.id as u64);
let new_id = IDRecv(ID::new_u64(actual_id));
new_id
(new_id, id_in_thread)
}
/// NOTE: does NOT check if the connection has been previously reserved!
pub(crate) fn track(
&mut self,
conn: Connection,
) -> Result<ConnTracker, ()> {
mut conn: Connection,
) -> Result<LibTracker, ()> {
let conn_id = match conn.id_recv {
IDRecv(ID::Handshake) => {
return Err(());
@ -534,17 +606,22 @@ impl ConnList {
};
let id_in_thread: usize =
(conn_id.get() / (self.thread_id.total as u64)) as usize;
let tracker = self.get_new_tracker(id_in_thread);
conn.lib_tracker = tracker;
self.connections[id_in_thread] = Some(conn);
let mut tracked;
Ok(tracker)
}
fn get_new_tracker(&mut self, id_in_thread: usize) -> LibTracker {
let mut tracker;
loop {
tracked = self.last_tracked.advance(self.thread_id.total);
if self.user_tracker.get(&tracked).is_none() {
tracker = self.last_tracked.advance(self.thread_id.total);
if self.user_tracker.get(&tracker).is_none() {
// like, never gonna happen, it's 64 bit
let _ = self.user_tracker.insert(tracked, id_in_thread);
let _ = self.user_tracker.insert(tracker, id_in_thread);
break;
}
}
Ok(tracked)
tracker
}
pub(crate) fn remove(&mut self, id: IDRecv) {
if let IDRecv(ID::ID(raw_id)) = id {

5
src/connection/stream/mod.rs
View File

@ -279,6 +279,11 @@ impl Stream {
Tracker::ROB(tracker) => tracker.recv(chunk),
}
}
pub(crate) fn get(&mut self) -> Vec<u8> {
match &mut self.data {
Tracker::ROB(tracker) => tracker.get(),
}
}
}
/// Track what has been sent and what has been ACK'd from a stream

175
src/inner/worker.rs
View File

@ -12,7 +12,7 @@ use crate::{
packet::{self, Packet},
socket::{UdpClient, UdpServer},
stream, AuthSrvConn, ConnList, ConnTracker, Connection, IDSend,
ServiceConn,
LibTracker, ServiceConn,
},
dnssec,
enc::{
@ -23,7 +23,7 @@ use crate::{
},
inner::ThreadTracker,
};
use ::std::{sync::Arc, vec::Vec};
use ::std::{collections::VecDeque, sync::Arc, vec::Vec};
/// This worker must be cpu-pinned
use ::tokio::{
net::UdpSocket,
@ -46,14 +46,23 @@ pub(crate) struct ConnectInfo {
// TODO: UserID, Token information
}
/// return to the user the data received from a connection
#[derive(Debug, Clone)]
pub struct ConnData {
/// Connection tracking information
pub conn: ConnTracker,
/// received data, for each stream
pub data: Vec<(stream::ID, Vec<u8>)>,
}
/// Connection event. Mostly used to give the data to the user
#[derive(Debug, Eq, PartialEq, Clone)]
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum Event {
/// Work loop has exited. nothing more to do
End,
/// Data from a connection
Data(Vec<u8>),
Data(ConnData),
}
pub(crate) enum Work {
@ -63,8 +72,8 @@ pub(crate) enum Work {
Connect(ConnectInfo),
DropHandshake(KeyID),
Recv(RawUdp),
UserSend((ConnTracker, stream::ID, Vec<u8>)),
SendData((ConnTracker, ::tokio::time::Instant)),
UserSend((LibTracker, stream::ID, Vec<u8>)),
SendData((LibTracker, ::tokio::time::Instant)),
}
/// Actual worker implementation.
@ -83,6 +92,8 @@ pub struct Worker {
queue_timeouts_send: mpsc::UnboundedSender<Work>,
thread_channels: Vec<::async_channel::Sender<Work>>,
connections: ConnList,
// connectsion untracker by the user. (users still needs to get(..) them)
untracked_connections: VecDeque<LibTracker>,
handshakes: handshake::Tracker,
work_timers: super::Timers,
}
@ -140,10 +151,82 @@ impl Worker {
queue_timeouts_send,
thread_channels: Vec::new(),
connections: ConnList::new(thread_id),
untracked_connections: VecDeque::with_capacity(8),
handshakes,
work_timers: super::Timers::new(),
})
}
/// return a handle to the worker that you can use to send data
/// The handle will enqueue work in the main worker and is thread-local safe
///
/// While this does not require `&mut` on the `Worker`, everything
/// will be put in the work queue,
/// So you might have less immediate results in a few cases
pub fn handle(&self) -> Handle {
Handle {
queue: self.queue_sender.clone(),
}
}
/// change the UserTracker in the connection
///
/// This is `unsafe` because you will be responsible for manually updating
/// any copy of the `ConnTracker` you might have cloned around
#[allow(unsafe_code)]
pub unsafe fn set_connection_tracker(
&mut self,
tracker: ConnTracker,
new_id: connection::UserTracker,
) -> Result<ConnTracker, crate::Error> {
let conn = self.connections.get_mut(tracker.lib)?;
conn.user_tracker = Some(new_id);
Ok(ConnTracker {
lib: tracker.lib,
user: Some(new_id),
})
}
/// Enqueue data to send
pub fn send(
&mut self,
tracker: LibTracker,
stream: stream::ID,
data: Vec<u8>,
) -> Result<(), crate::Error> {
let conn = self.connections.get_mut(tracker)?;
conn.enqueue(stream, data)?;
Ok(())
}
/// Returns new connections, if any
///
/// You can provide an optional tracker, different from the library tracker.
///
/// Differently from the library tracker, you can change this later on,
/// but you will be responsible to change it on every `ConnTracker`
/// you might have cloned elsewhere
pub fn try_get_connection(
&mut self,
tracker: Option<connection::UserTracker>,
) -> Option<ConnTracker> {
let ret_tracker = ConnTracker {
lib: self.untracked_connections.pop_front()?,
user: None,
};
match tracker {
Some(tracker) => {
#[allow(unsafe_code)]
match unsafe {
self.set_connection_tracker(ret_tracker, tracker)
} {
Ok(tracker) => Some(tracker),
Err(_) => {
// we had a connection, but it expired before the user
// remembered to get it. Just remove it from the queue.
None
}
}
}
None => Some(ret_tracker),
}
}
/// Continuously loop and process work as needed
pub async fn work_loop(&mut self) -> Result<Event, crate::Error> {
@ -441,16 +524,18 @@ impl Worker {
}
};
}
Work::Recv(pkt) => {
self.recv(pkt).await;
}
Work::Recv(pkt) => match self.recv(pkt).await {
Ok(event) => return Ok(event),
Err(_) => continue 'mainloop,
},
Work::UserSend((tracker, stream, data)) => {
let conn = match self.connections.get_mut(tracker) {
None => continue,
Some(conn) => conn,
Ok(conn) => conn,
Err(_) => continue 'mainloop,
};
use connection::Enqueue;
match conn.enqueue(stream, data) {
if let Ok(enqueued) = conn.enqueue(stream, data) {
match enqueued {
Enqueue::Immediate(instant) => {
let _ = self
.queue_sender
@ -458,10 +543,6 @@ impl Worker {
.await;
}
Enqueue::TimerWait => {}
Enqueue::NoSuchStream => {
::tracing::error!(
"Trying to send on unknown stream"
);
}
}
}
@ -484,8 +565,8 @@ impl Worker {
let mut raw: Vec<u8> = Vec::with_capacity(1200);
raw.resize(raw.capacity(), 0);
let conn = match self.connections.get_mut(tracker) {
None => continue,
Some(conn) => conn,
Ok(conn) => conn,
Err(_) => continue,
};
let pkt = match conn.write_pkt(&mut raw) {
Ok(pkt) => pkt,
@ -506,7 +587,7 @@ impl Worker {
Ok(Event::End)
}
/// Read and do stuff with the raw udp packet
async fn recv(&mut self, mut udp: RawUdp) {
async fn recv(&mut self, mut udp: RawUdp) -> Result<Event, ()> {
if udp.packet.id.is_handshake() {
let handshake = match Handshake::deserialize(
&udp.data[connection::ID::len()..],
@ -514,7 +595,7 @@ impl Worker {
Ok(handshake) => handshake,
Err(e) => {
::tracing::debug!("Handshake parsing: {}", e);
return;
return Err(());
}
};
let action = match self.handshakes.recv_handshake(
@ -524,26 +605,34 @@ impl Worker {
Ok(action) => action,
Err(err) => {
::tracing::debug!("Handshake recv error {}", err);
return;
return Err(());
}
};
self.recv_handshake(udp, action).await;
Err(())
} else {
self.recv_packet(udp);
self.recv_packet(udp)
}
}
/// Receive a non-handshake packet
fn recv_packet(&mut self, udp: RawUdp) {
fn recv_packet(&mut self, udp: RawUdp) -> Result<Event, ()> {
let conn = match self.connections.get_id_mut(udp.packet.id) {
None => return,
Some(conn) => conn,
Ok(conn) => conn,
Err(_) => return Err(()),
};
match conn.recv(udp) {
Ok(stream::StreamData::NotReady) => {}
Ok(stream::StreamData::Ready) => {
//
Ok(stream::StreamData::NotReady) => Err(()),
Ok(stream::StreamData::Ready) => Ok(Event::Data(ConnData {
conn: ConnTracker {
user: conn.user_tracker,
lib: conn.lib_tracker,
},
data: conn.get_data().unwrap(),
})),
Err(e) => {
::tracing::trace!("Conn Recv: {:?}", e.to_string());
Err(())
}
Err(e) => ::tracing::trace!("Conn Recv: {:?}", e.to_string()),
}
}
/// Receive an handshake packet
@ -625,6 +714,9 @@ impl Worker {
// track connection
let auth_id_recv = self.connections.reserve_first();
auth_conn.id_recv = auth_id_recv;
let (tracker, auth_conn) =
self.connections.reserve_and_track(auth_conn);
self.untracked_connections.push_back(tracker);
let resp_data = dirsync::resp::Data {
client_nonce: req_data.nonce,
@ -706,9 +798,9 @@ impl Worker {
return;
}
};
let authsrv_conn = AuthSrvConn(connection::Conn {
queue: self.queue_sender.clone(),
fast: track_auth_conn,
let authsrv_conn = AuthSrvConn(ConnTracker {
lib: track_auth_conn,
user: None,
});
let mut service_conn = None;
if cci.service_id != auth::SERVICEID_AUTH {
@ -748,9 +840,9 @@ impl Worker {
return;
}
};
service_conn = Some(ServiceConn(connection::Conn {
queue: self.queue_sender.clone(),
fast: track_serv_conn,
service_conn = Some(ServiceConn(ConnTracker {
lib: track_serv_conn,
user: None,
}));
}
let _ = cci.answer.send(Ok(handshake::tracker::ConnectOk {
@ -786,3 +878,16 @@ impl Worker {
let _res = src_sock.send_to(&data, client.0).await;
}
}
/// Handle to send work asyncronously to the worker
#[derive(Debug, Clone)]
pub struct Handle {
queue: ::async_channel::Sender<Work>,
}
impl Handle {
// TODO
// pub fn send(..)
// pub fn set_connection_id(..)
// try_get_new_connections()
}

10
src/lib.rs
View File

@ -59,15 +59,15 @@ pub enum Error {
/// Handshake errors
#[error("Handshake: {0:?}")]
Handshake(#[from] handshake::Error),
/// Key error
#[error("key: {0:?}")]
Key(#[from] crate::enc::Error),
/// Resolution problems. wrong or incomplete DNSSEC data
#[error("DNSSEC resolution: {0}")]
Resolution(String),
/// Wrapper on encryption errors
#[error("Encrypt: {0}")]
Encrypt(enc::Error),
#[error("Crypto: {0}")]
Crypto(#[from] enc::Error),
/// Wrapper on connection errors
#[error("Connection: {0}")]
Connection(#[from] connection::Error),
}
pub(crate) enum StopWorking {