diff --git a/Cargo.toml b/Cargo.toml index 7c194df..ca20fe4 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -9,7 +9,8 @@ edition = "2021" rust-version = "1.67.0" homepage = "https://git.runesauth.com/RunesAuth/libFenrir" repository = "https://git.runesauth.com/RunesAuth/libFenrir" -license = "Apache-2.0" +license = "Apache-2.0 WITH LLVM-exception" +license-file = "LICENSE" keywords = [ "Fenrir", "libFenrir", "authentication" ] categories = [ "authentication", "cryptography", "network-programming" ] @@ -28,6 +29,7 @@ crate_type = [ "lib", "cdylib", "staticlib" ] # base85 repo has no tags, fix on a commit. v1.1.1 points to older, wrong version base85 = { git = "https://gitlab.com/darkwyrm/base85", rev = "d98efbfd171dd9ba48e30a5c88f94db92fc7b3c6" } futures = { version = "^0.3" } +libc = { version = "^0.2" } num-traits = { version = "^0.2" } num-derive = { version = "^0.3" } strum = { version = "^0.24" } diff --git a/LICENSE b/LICENSE index 137069b..f9dc506 100644 --- a/LICENSE +++ b/LICENSE @@ -1,73 +1,219 @@ -Apache License -Version 2.0, January 2004 -http://www.apache.org/licenses/ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ -TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION -1. 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shellHook = '' # use zsh or other custom shell diff --git a/src/Architecture.md b/src/Architecture.md new file mode 100644 index 0000000..b9f0c66 --- /dev/null +++ b/src/Architecture.md @@ -0,0 +1,51 @@ +# Architecture + +For now we will keep things as easy as possible, not caring about the performance. + +This means we will use only ::tokio and spawn one job per connection + + +# Future + +I randomly came across this can easily explains most problems with multithreaded +scaling and work queues: +https://tokio.rs/blog/2019-10-scheduler + +What we want to do is: +* one thread per core +* thread pinning +* ebpf BBR packet pacing + * need to support non-ebpf BBR for mobile ios, too +* connection sharding + * directly in ebpf? + * based on connection id + * no cross-core talk +* implement connection id change + * any enpoint can ask the other to change the connection id + * once ACK is received, takes effect, old connection id dropped? + * lets us rebalance the work on cores, without synchronization + * can just use one work queue for core, without work stealing + +## Problems + +### How to integrate application thread pool with libFenrir? + +The application/service will obviously have to do some work on its own + +This means that it will have either: +* its own thread pool +* our same threadpool + +Handling the connection on one thread, only to have the work done elsewhere +will incurr in cross-cpu talk, cache invalidations, synchronization techniques, etc + +So we should find a way to either: +* use the same threadpool as the application +* sync work threads with the application threadpool + +Do remember that all of this is not just Rust, but it will have a C interface, +which means that it will be used by other languages, too. + +This alone probably means that we should run our own tokio runtime + + diff --git a/src/connection/handshake.rs b/src/connection/handshake.rs new file mode 100644 index 0000000..a0ca9ba --- /dev/null +++ b/src/connection/handshake.rs @@ -0,0 +1,3 @@ +//! Handhsake handling + + diff --git a/src/connection/mod.rs b/src/connection/mod.rs new file mode 100644 index 0000000..d5ded85 --- /dev/null +++ b/src/connection/mod.rs @@ -0,0 +1,6 @@ +//! Connection handling and send/receive queues + +mod handshake; +mod packet; +pub use packet::ConnectionID; +pub use packet::Packet; diff --git a/src/connection/packet.rs b/src/connection/packet.rs new file mode 100644 index 0000000..a185838 --- /dev/null +++ b/src/connection/packet.rs @@ -0,0 +1,47 @@ +// +//! Raw packet handling, encryption, decryption, parsing + +/// Fenrir Connection id +/// 0 is special as it represents the handshake +/// Connection IDs are to be considered u64 little endian +#[derive(Debug, Copy, Clone, PartialEq)] +pub enum ConnectionID { + /// Connection id 0 represent the handshake + Handshake, + /// Non-zero id can represent any connection + ID(::core::num::NonZeroU64), +} + +impl ConnectionID { + /// Quick check to know if this is an handshake + pub fn is_handshake(&self) -> bool { + *self == ConnectionID::Handshake + } +} + +impl From for ConnectionID { + fn from(raw: u64) -> Self { + if raw == 0 { + ConnectionID::Handshake + } else { + #[allow(unsafe_code)] + unsafe { + ConnectionID::ID(::core::num::NonZeroU64::new_unchecked(raw)) + } + } + } +} + +impl From<[u8; 8]> for ConnectionID { + fn from(raw: [u8; 8]) -> Self { + let raw_u64 = u64::from_le_bytes(raw); + raw_u64.into() + } +} + +/// Fenrir packet structure +#[derive(Debug, Copy, Clone)] +pub struct Packet { + /// Id of the Fenrir connection. + id: ConnectionID, +} diff --git a/src/lib.rs b/src/lib.rs index 368b431..811c1b2 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -18,6 +18,7 @@ use ::tokio::{net::UdpSocket, task::JoinHandle}; mod config; pub use config::Config; +pub mod connection; pub mod dnssec; /// Main fenrir library errors @@ -68,6 +69,7 @@ impl Fenrir { }; Ok(endpoint) } + /// Start all workers, listeners pub async fn start(&mut self) -> Result<(), Error> { if let Err(e) = self.add_sockets().await { @@ -77,6 +79,7 @@ impl Fenrir { self.dnssec = Some(dnssec::Dnssec::new(&self.cfg.resolvers).await?); Ok(()) } + /// Stop all workers, listeners /// asyncronous version for Drop fn stop_sync(&mut self) { @@ -87,6 +90,7 @@ impl Fenrir { let _ = ::futures::executor::block_on(task); self.dnssec = None; } + /// Stop all workers, listeners pub async fn stop(&mut self) { let _ = self.stop_working.send(true); @@ -95,6 +99,7 @@ impl Fenrir { Self::stop_sockets(toempty_socket).await; self.dnssec = None; } + /// actually do the work of stopping resolvers and listeners async fn stop_sockets( sockets: Vec<(Arc, JoinHandle<::std::io::Result<()>>)>, @@ -103,11 +108,81 @@ impl Fenrir { let _ = s.1.await; } } + + /// Enable some common socket options. This is just the unsafe part + fn enable_sock_opt( + fd: ::std::os::fd::RawFd, + option: ::libc::c_int, + value: ::libc::c_int, + ) -> ::std::io::Result<()> { + #[allow(unsafe_code)] + unsafe { + #[allow(trivial_casts)] + let val = &value as *const _ as *const ::libc::c_void; + let size = ::std::mem::size_of_val(&value) as ::libc::socklen_t; + // always clear the error bit before doing a new syscall + let _ = ::std::io::Error::last_os_error(); + let ret = + ::libc::setsockopt(fd, ::libc::SOL_SOCKET, option, val, size); + if ret != 0 { + return Err(::std::io::Error::last_os_error()); + } + } + Ok(()) + } + /// Add an async udp listener + async fn bind_udp(sock: SocketAddr) -> ::std::io::Result { + let socket = UdpSocket::bind(sock).await?; + + use ::std::os::fd::AsRawFd; + let fd = socket.as_raw_fd(); + // can be useful later on for reloads + Self::enable_sock_opt(fd, ::libc::SO_REUSEADDR, 1)?; + Self::enable_sock_opt(fd, ::libc::SO_REUSEPORT, 1)?; + + // We will do path MTU discovery by ourselves, + // always set the "don't fragment" bit + if sock.is_ipv6() { + Self::enable_sock_opt(fd, ::libc::IPV6_DONTFRAG, 1)?; + } else { + // FIXME: linux only + Self::enable_sock_opt( + fd, + ::libc::IP_MTU_DISCOVER, + ::libc::IP_PMTUDISC_DO, + )?; + } + + Ok(socket) + } + + /// Run a dedicated loop to read packets on the listening socket + async fn listen_udp( + mut stop_working: ::tokio::sync::broadcast::Receiver, + socket: Arc, + ) -> ::std::io::Result<()> { + // jumbo frames are 9K max + let mut buffer: [u8; 9000] = [0; 9000]; + loop { + let (bytes, sock_from) = ::tokio::select! { + _done = stop_working.recv() => { + break; + } + result = socket.recv_from(&mut buffer) => { + result? + } + }; + Self::recv(&buffer[0..bytes], sock_from).await; + } + Ok(()) + } + /// Add all UDP sockets found in config /// and start listening for packets async fn add_sockets(&mut self) -> ::std::io::Result<()> { let sockets = self.cfg.listen.iter().map(|s_addr| async { - let socket = ::tokio::spawn(bind_udp(s_addr.clone())).await??; + let socket = + ::tokio::spawn(Self::bind_udp(s_addr.clone())).await??; Ok(Arc::new(socket)) }); let sockets = ::futures::future::join_all(sockets).await; @@ -115,8 +190,10 @@ impl Fenrir { match s_res { Ok(s) => { let stop_working = self.stop_working.subscribe(); - let join = - ::tokio::spawn(listen_udp(stop_working, s.clone())); + let join = ::tokio::spawn(Self::listen_udp( + stop_working, + s.clone(), + )); self.sockets.push((s, join)); } Err(e) => { @@ -126,6 +203,7 @@ impl Fenrir { } Ok(()) } + /// Get the raw TXT record of a Fenrir domain pub async fn resolv_str(&self, domain: &str) -> Result { match &self.dnssec { @@ -133,42 +211,24 @@ impl Fenrir { None => Err(Error::NotInitialized), } } + /// Get the raw TXT record of a Fenrir domain pub async fn resolv(&self, domain: &str) -> Result { let record_str = self.resolv_str(domain).await?; Ok(dnssec::Dnssec::parse_txt_record(&record_str)?) } -} -/// Add an async udp listener -async fn bind_udp(sock: SocketAddr) -> ::std::io::Result { - let socket = UdpSocket::bind(sock).await?; - // PERF: SO_REUSEADDR/REUSEPORT - Ok(socket) -} - -/// Run a dedicated loop to read packets on the listening socket -async fn listen_udp( - mut stop_working: ::tokio::sync::broadcast::Receiver, - socket: Arc, -) -> ::std::io::Result<()> { - // jumbo frames are 9K max - let mut buffer: [u8; 9000] = [0; 9000]; - loop { - let (bytes, sock_from) = ::tokio::select! { - _done = stop_working.recv() => { - break; - } - result = socket.recv_from(&mut buffer) => { - result? - } - }; - work(&buffer[0..bytes], sock_from).await; + const MIN_PACKET_BYTES: usize = 8; + /// Read and do stuff with the udp packet + async fn recv(buffer: &[u8], _sock_from: SocketAddr) { + if buffer.len() < Self::MIN_PACKET_BYTES { + return; + } + use connection::ConnectionID; + let raw_id: [u8; 8] = buffer.try_into().expect("unreachable"); + if ConnectionID::from(raw_id).is_handshake() { + todo!(); + } + todo!(); } - Ok(()) -} - -/// Read and do stuff with the udp packet -async fn work(_buffer: &[u8], _sock_from: SocketAddr) { - // Do nothing for now }