Work on platform specific code (Linux)

src/configuration/config.rs

@@ -1,9 +1,11 @@
+use spin::Mutex;
 use std::net::{IpAddr, SocketAddr};
 use x25519_dalek::{PublicKey, StaticSecret};
 
-use super::wireguard::Wireguard;
-use super::types::bind::Bind;
-use super::types::tun::Tun;
+use super::BindOwner;
+use super::PlatformBind;
+use super::Tun;
+use super::Wireguard;
 
 /// The goal of the configuration interface is, among others,
 /// to hide the IO implementations (over which the WG device is generic),
@@ -19,15 +21,28 @@ pub struct PeerState {
     allowed_ips: Vec<(IpAddr, u32)>,
 }
 
+struct UDPState<O: BindOwner> {
+    fwmark: Option<u32>,
+    owner: O,
+    port: u16,
+}
+
+pub struct WireguardConfig<T: Tun, B: PlatformBind> {
+    wireguard: Wireguard<T, B>,
+    network: Mutex<Option<UDPState<B::Owner>>>,
+}
+
 pub enum ConfigError {
-    NoSuchPeer
+    NoSuchPeer,
+    NotListening,
 }
 
 impl ConfigError {
-
     fn errno(&self) -> i32 {
+        // TODO: obtain the correct error values
         match self {
             NoSuchPeer => 1,
+            NotListening => 2,
         }
     }
 }
@@ -122,7 +137,11 @@ pub trait Configuration {
     ///
     /// - `peer': The public key of the peer
     /// - `psk`
-    fn set_persistent_keepalive_interval(&self, peer: PublicKey) -> Option<ConfigError>;
+    fn set_persistent_keepalive_interval(
+        &self,
+        peer: PublicKey,
+        interval: usize,
+    ) -> Option<ConfigError>;
 
     /// Remove all allowed IPs from the peer
     ///
@@ -161,26 +180,81 @@ pub trait Configuration {
     fn get_peers(&self) -> Vec<PeerState>;
 }
 
-impl <T : Tun, B : Bind>Configuration for Wireguard<T, B> {
-
-    fn set_private_key(&self, sk : Option<StaticSecret>) {
-        self.set_key(sk)
+impl<T: Tun, B: PlatformBind> Configuration for WireguardConfig<T, B> {
+    fn set_private_key(&self, sk: Option<StaticSecret>) {
+        self.wireguard.set_key(sk)
     }
 
     fn get_private_key(&self) -> Option<StaticSecret> {
-        self.get_sk()
+        self.wireguard.get_sk()
     }
 
     fn get_protocol_version(&self) -> usize {
         1
     }
 
-    fn set_listen_port(&self, port : u16) -> Option<ConfigError> {
+    fn set_listen_port(&self, port: u16) -> Option<ConfigError> {
+        let mut udp = self.network.lock();
+
+        // close the current listener
+        *udp = None;
+
         None
     }
-    
+
     fn set_fwmark(&self, mark: Option<u32>) -> Option<ConfigError> {
+        match self.network.lock().as_mut() {
+            Some(mut bind) => {
+                // there is a active bind
+                // set the fwmark (the IO operation)
+                bind.owner.set_fwmark(mark).unwrap(); // TODO: handle
+
+                // update stored value
+                bind.fwmark = mark;
+                None
+            }
+            None => Some(ConfigError::NotListening),
+        }
+    }
+
+    fn replace_peers(&self) {
+        self.wireguard.clear_peers();
+    }
+
+    fn remove_peer(&self, peer: PublicKey) {
+        self.wireguard.remove_peer(peer);
+    }
+
+    fn add_peer(&self, peer: PublicKey) -> bool {
+        self.wireguard.new_peer(peer);
+        false
+    }
+
+    fn set_preshared_key(&self, peer: PublicKey, psk: Option<[u8; 32]>) -> Option<ConfigError> {
+        None
+    }
+
+    fn set_endpoint(&self, peer: PublicKey, addr: SocketAddr) -> Option<ConfigError> {
+        None
+    }
+
+    fn set_persistent_keepalive_interval(
+        &self,
+        peer: PublicKey,
+        interval: usize,
+    ) -> Option<ConfigError> {
         None
     }
 
-}
+    fn replace_allowed_ips(&self, peer: PublicKey) -> Option<ConfigError> {
+        None
+    }
+
+    fn add_allowed_ip(&self, peer: PublicKey, ip: IpAddr, masklen: u32) -> Option<ConfigError> {
+        None
+    }
+
+    fn get_peers(&self) -> Vec<PeerState> {
+        vec![]
+    }
+}

src/configuration/mod.rs

@@ -0,0 +1,5 @@
+mod config;
+
+use super::platform::{BindOwner, PlatformBind};
+use super::wireguard::tun::Tun;
+use super::wireguard::Wireguard;

src/main.rs

@@ -6,12 +6,12 @@ extern crate jemallocator;
 #[global_allocator]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
-// mod config;
+mod configuration;
 mod platform;
 mod wireguard;
 
-use platform::TunBind;
+use platform::PlatformTun;
 
 fn main() {
-    let (readers, writers, mtu) = platform::PlatformTun::create("test").unwrap();
+    let (readers, writer, mtu) = platform::TunInstance::create("test").unwrap();
 }

src/platform/dummy.rs

@@ -0,0 +1,22 @@
+#[cfg(test)]
+use super::super::wireguard::dummy;
+use super::BindOwner;
+use super::PlatformBind;
+
+pub struct VoidOwner {}
+
+impl BindOwner for VoidOwner {
+    type Error = dummy::BindError;
+
+    fn set_fwmark(&self, value: Option<u32>) -> Option<Self::Error> {
+        None
+    }
+}
+
+impl PlatformBind for dummy::PairBind {
+    type Owner = VoidOwner;
+
+    fn bind(_port: u16) -> Result<(Vec<Self::Reader>, Self::Writer, Self::Owner), Self::Error> {
+        Err(dummy::BindError::Disconnected)
+    }
+}

src/platform/linux/mod.rs

@@ -1,4 +1,5 @@
 mod tun;
 mod udp;
 
-pub use tun::PlatformTun;
+pub use tun::LinuxTun;
+pub use udp::LinuxBind;

src/platform/linux/tun.rs

@@ -1,6 +1,6 @@
 use super::super::super::wireguard::tun::*;
+use super::super::PlatformTun;
 use super::super::Tun;
-use super::super::TunBind;
 
 use libc::*;
 
@@ -32,13 +32,13 @@ struct Ifreq {
     _pad: [u8; 64],
 }
 
-pub struct PlatformTun {}
+pub struct LinuxTun {}
 
-pub struct PlatformTunReader {
+pub struct LinuxTunReader {
     fd: RawFd,
 }
 
-pub struct PlatformTunWriter {
+pub struct LinuxTunWriter {
     fd: RawFd,
 }
 
@@ -46,7 +46,7 @@ pub struct PlatformTunWriter {
  * announcing an MTU update for the interface
  */
 #[derive(Clone)]
-pub struct PlatformTunMTU {
+pub struct LinuxTunMTU {
     value: Arc<AtomicUsize>,
 }
 
@@ -83,14 +83,14 @@ impl Error for LinuxTunError {
     }
 }
 
-impl MTU for PlatformTunMTU {
+impl MTU for LinuxTunMTU {
     #[inline(always)]
     fn mtu(&self) -> usize {
         self.value.load(Ordering::Relaxed)
     }
 }
 
-impl Reader for PlatformTunReader {
+impl Reader for LinuxTunReader {
     type Error = LinuxTunError;
 
     fn read(&self, buf: &mut [u8], offset: usize) -> Result<usize, Self::Error> {
@@ -109,7 +109,7 @@ impl Reader for PlatformTunReader {
     }
 }
 
-impl Writer for PlatformTunWriter {
+impl Writer for LinuxTunWriter {
     type Error = LinuxTunError;
 
     fn write(&self, src: &[u8]) -> Result<(), Self::Error> {
@@ -120,14 +120,14 @@ impl Writer for PlatformTunWriter {
     }
 }
 
-impl Tun for PlatformTun {
+impl Tun for LinuxTun {
     type Error = LinuxTunError;
-    type Reader = PlatformTunReader;
-    type Writer = PlatformTunWriter;
-    type MTU = PlatformTunMTU;
+    type Reader = LinuxTunReader;
+    type Writer = LinuxTunWriter;
+    type MTU = LinuxTunMTU;
 }
 
-impl TunBind for PlatformTun {
+impl PlatformTun for LinuxTun {
     fn create(name: &str) -> Result<(Vec<Self::Reader>, Self::Writer, Self::MTU), Self::Error> {
         // construct request struct
         let mut req = Ifreq {
@@ -157,10 +157,10 @@ impl TunBind for PlatformTun {
 
         // create PlatformTunMTU instance
         Ok((
-            vec![PlatformTunReader { fd }], // TODO: enable multi-queue for Linux
-            PlatformTunWriter { fd },
-            PlatformTunMTU {
-                value: Arc::new(AtomicUsize::new(1500)),
+            vec![LinuxTunReader { fd }], // TODO: enable multi-queue for Linux
+            LinuxTunWriter { fd },
+            LinuxTunMTU {
+                value: Arc::new(AtomicUsize::new(1500)), // TODO: fetch and update
             },
         ))
     }
@@ -174,7 +174,7 @@ mod tests {
     fn is_root() -> bool {
         match env::var("USER") {
             Ok(val) => val == "root",
-            Err(e) => false,
+            Err(_) => false,
         }
     }
 
@@ -183,6 +183,7 @@ mod tests {
         if !is_root() {
             return;
         }
-        let (readers, writers, mtu) = PlatformTun::create("test").unwrap();
+        let (readers, writers, mtu) = LinuxTun::create("test").unwrap();
+        // TODO: test (any good idea how?)
     }
 }

src/platform/linux/udp.rs

@@ -0,0 +1,27 @@
+use super::super::Bind;
+use super::super::Endpoint;
+use super::super::PlatformBind;
+
+use std::net::SocketAddr;
+
+pub struct LinuxEndpoint {}
+
+pub struct LinuxBind {}
+
+impl Endpoint for LinuxEndpoint {
+    fn clear_src(&mut self) {}
+
+    fn from_address(addr: SocketAddr) -> Self {
+        LinuxEndpoint {}
+    }
+
+    fn into_address(&self) -> SocketAddr {
+        "127.0.0.1:6060".parse().unwrap()
+    }
+}
+
+/*
+impl Bind for PlatformBind {
+    type Endpoint = PlatformEndpoint;
+}
+*/

src/platform/mod.rs

@@ -2,21 +2,32 @@ use std::error::Error;
 
 use super::wireguard::bind::Bind;
 use super::wireguard::tun::Tun;
+use super::wireguard::Endpoint;
+
+#[cfg(test)]
+mod dummy;
 
 #[cfg(target_os = "linux")]
 mod linux;
 
 #[cfg(target_os = "linux")]
-pub use linux::PlatformTun;
+pub use linux::LinuxTun as TunInstance;
+
+pub trait BindOwner: Send {
+    type Error: Error;
+
+    fn set_fwmark(&self, value: Option<u32>) -> Option<Self::Error>;
+}
 
-pub trait UDPBind: Bind {
-    type Closer;
+pub trait PlatformBind: Bind {
+    type Owner: BindOwner;
 
     /// Bind to a new port, returning the reader/writer and
-    /// an associated instance of the Closer type, which closes the UDP socket upon "drop".
-    fn bind(port: u16) -> Result<(Self::Reader, Self::Writer, Self::Closer), Self::Error>;
+    /// an associated instance of the owner type, which closes the UDP socket upon "drop"
+    /// and enables configuration of the fwmark value.
+    fn bind(port: u16) -> Result<(Vec<Self::Reader>, Self::Writer, Self::Owner), Self::Error>;
 }
 
-pub trait TunBind: Tun {
+pub trait PlatformTun: Tun {
     fn create(name: &str) -> Result<(Vec<Self::Reader>, Self::Writer, Self::MTU), Self::Error>;
 }

src/wireguard/handshake/device.rs

@@ -77,9 +77,9 @@ impl Device {
     }
 
     /// Return the secret key of the device
-    /// 
+    ///
     /// # Returns
-    /// 
+    ///
     /// A secret key (x25519 scalar)
     pub fn get_sk(&self) -> StaticSecret {
         StaticSecret::from(self.sk.to_bytes())
@@ -95,7 +95,7 @@ impl Device {
     pub fn add(&mut self, pk: PublicKey) -> Result<(), ConfigError> {
         // check that the pk is not added twice
         if let Some(_) = self.pk_map.get(pk.as_bytes()) {
-            return Err(ConfigError::new("Duplicate public key"));
+            return Ok(());
         };
 
         // check that the pk is not that of the device

src/wireguard/mod.rs

@@ -1,7 +1,6 @@
-mod wireguard;
-// mod config;
 mod constants;
 mod timers;
+mod wireguard;
 
 mod handshake;
 mod router;
@@ -12,12 +11,14 @@ mod tests;
 
 /// The WireGuard sub-module contains a pure, configurable implementation of WireGuard.
 /// The implementation is generic over:
-/// 
+///
 /// - TUN type, specifying how packets are received on the interface side: a reader/writer and MTU reporting interface.
 /// - Bind type, specifying how WireGuard messages are sent/received from the internet and what constitutes an "endpoint"
-
-pub use wireguard::{Wireguard, Peer};
+pub use wireguard::{Peer, Wireguard};
 
 pub use types::bind;
 pub use types::tun;
-pub use types::Endpoint;
+pub use types::Endpoint;
+
+#[cfg(test)]
+pub use types::dummy;

src/wireguard/types/dummy.rs

@@ -2,11 +2,11 @@ use std::error::Error;
 use std::fmt;
 use std::marker;
 use std::net::SocketAddr;
+use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::mpsc::{sync_channel, Receiver, SyncSender};
 use std::sync::Arc;
 use std::sync::Mutex;
 use std::time::Instant;
-use std::sync::atomic::{Ordering, AtomicUsize};
 
 use super::*;
 
@@ -43,7 +43,7 @@ impl fmt::Display for BindError {
 
 #[derive(Debug)]
 pub enum TunError {
-    Disconnected
+    Disconnected,
 }
 
 impl Error for TunError {
@@ -76,7 +76,7 @@ impl Endpoint for UnitEndpoint {
         "127.0.0.1:8080".parse().unwrap()
     }
 
-    fn clear_src(&self) {}
+    fn clear_src(&mut self) {}
 }
 
 impl UnitEndpoint {
@@ -92,21 +92,21 @@ pub struct TunTest {}
 pub struct TunFakeIO {
     store: bool,
     tx: SyncSender<Vec<u8>>,
-    rx: Receiver<Vec<u8>>
+    rx: Receiver<Vec<u8>>,
 }
 
 pub struct TunReader {
-    rx: Receiver<Vec<u8>>
+    rx: Receiver<Vec<u8>>,
 }
 
 pub struct TunWriter {
     store: bool,
-    tx: Mutex<SyncSender<Vec<u8>>>
+    tx: Mutex<SyncSender<Vec<u8>>>,
 }
 
 #[derive(Clone)]
 pub struct TunMTU {
-    mtu: Arc<AtomicUsize>
+    mtu: Arc<AtomicUsize>,
 }
 
 impl tun::Reader for TunReader {
@@ -118,7 +118,7 @@ impl tun::Reader for TunReader {
                 buf[offset..].copy_from_slice(&m[..]);
                 Ok(m.len())
             }
-            Err(_) => Err(TunError::Disconnected)
+            Err(_) => Err(TunError::Disconnected),
         }
     }
 }
@@ -131,7 +131,7 @@ impl tun::Writer for TunWriter {
             let m = src.to_owned();
             match self.tx.lock().unwrap().send(m) {
                 Ok(_) => Ok(()),
-                Err(_) => Err(TunError::Disconnected)
+                Err(_) => Err(TunError::Disconnected),
             }
         } else {
             Ok(())
@@ -153,7 +153,7 @@ impl tun::Tun for TunTest {
 }
 
 impl TunFakeIO {
-    pub fn write(&self, msg : Vec<u8>) {
+    pub fn write(&self, msg: Vec<u8>) {
         if self.store {
             self.tx.send(msg).unwrap();
         }
@@ -165,15 +165,31 @@ impl TunFakeIO {
 }
 
 impl TunTest {
-    pub fn create(mtu : usize, store: bool) -> (TunFakeIO, TunReader, TunWriter, TunMTU) {
-
-        let (tx1, rx1) = if store { sync_channel(32) } else { sync_channel(1) };
-        let (tx2, rx2) = if store { sync_channel(32) } else { sync_channel(1) };
-
-        let fake = TunFakeIO{tx: tx1, rx: rx2, store};
-        let reader = TunReader{rx : rx1};
-        let writer = TunWriter{tx : Mutex::new(tx2), store};
-        let mtu = TunMTU{mtu : Arc::new(AtomicUsize::new(mtu))};
+    pub fn create(mtu: usize, store: bool) -> (TunFakeIO, TunReader, TunWriter, TunMTU) {
+        let (tx1, rx1) = if store {
+            sync_channel(32)
+        } else {
+            sync_channel(1)
+        };
+        let (tx2, rx2) = if store {
+            sync_channel(32)
+        } else {
+            sync_channel(1)
+        };
+
+        let fake = TunFakeIO {
+            tx: tx1,
+            rx: rx2,
+            store,
+        };
+        let reader = TunReader { rx: rx1 };
+        let writer = TunWriter {
+            tx: Mutex::new(tx2),
+            store,
+        };
+        let mtu = TunMTU {
+            mtu: Arc::new(AtomicUsize::new(mtu)),
+        };
 
         (fake, reader, writer, mtu)
     }

src/wireguard/types/endpoint.rs

@@ -3,5 +3,5 @@ use std::net::SocketAddr;
 pub trait Endpoint: Send + 'static {
     fn from_address(addr: SocketAddr) -> Self;
     fn into_address(&self) -> SocketAddr;
-    fn clear_src(&self);
+    fn clear_src(&mut self);
 }

src/wireguard/types/mod.rs

@@ -1,10 +1,11 @@
 mod endpoint;
 mod keys;
-pub mod tun;
+
 pub mod bind;
+pub mod tun;
 
 #[cfg(test)]
 pub mod dummy;
 
 pub use endpoint::Endpoint;
-pub use keys::{Key, KeyPair};
+pub use keys::{Key, KeyPair};

src/wireguard/wireguard.rs

@@ -54,7 +54,7 @@ pub struct PeerInner<B: Bind> {
     pub handshake_queued: AtomicBool,
 
     pub queue: Mutex<Sender<HandshakeJob<B::Endpoint>>>, // handshake queue
-    pub pk: PublicKey, // DISCUSS: Change layout in handshake module (adopt pattern of router), to avoid this.
+    pub pk: PublicKey, // DISCUSS: Change layout in handshake module (adopt pattern of router), to avoid this. TODO: remove
     pub timers: RwLock<Timers>, //
 }
 
@@ -99,7 +99,7 @@ pub enum HandshakeJob<E> {
     New(PublicKey),
 }
 
-struct WireguardInner<T: Tun, B: Bind> {
+pub struct WireguardInner<T: Tun, B: Bind> {
     // provides access to the MTU value of the tun device
     // (otherwise owned solely by the router and a dedicated read IO thread)
     mtu: T::MTU,
@@ -118,9 +118,21 @@ struct WireguardInner<T: Tun, B: Bind> {
     queue: Mutex<Sender<HandshakeJob<B::Endpoint>>>,
 }
 
+#[derive(Clone)]
+pub struct WireguardHandle<T: Tun, B: Bind> {
+    inner: Arc<WireguardInner<T, B>>,
+}
+
+impl<T: Tun, B: Bind> Deref for WireguardHandle<T, B> {
+    type Target = Arc<WireguardInner<T, B>>;
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
 pub struct Wireguard<T: Tun, B: Bind> {
     runner: Runner,
-    state: Arc<WireguardInner<T, B>>,
+    state: WireguardHandle<T, B>,
 }
 
 /* Returns the padded length of a message:
@@ -146,6 +158,24 @@ const fn padding(size: usize, mtu: usize) -> usize {
 }
 
 impl<T: Tun, B: Bind> Wireguard<T, B> {
+    pub fn clear_peers(&self) {
+        self.state.peers.write().clear();
+    }
+
+    pub fn remove_peer(&self, pk: PublicKey) {
+        self.state.peers.write().remove(pk.as_bytes());
+    }
+
+    pub fn list_peers(&self) -> Vec<Peer<T, B>> {
+        let peers = self.state.peers.read();
+        let mut list = Vec::with_capacity(peers.len());
+        for (k, v) in peers.iter() {
+            debug_assert!(k == v.pk.as_bytes());
+            list.push(v.clone());
+        }
+        list
+    }
+
     pub fn set_key(&self, sk: Option<StaticSecret>) {
         let mut handshake = self.state.handshake.write();
         match sk {
@@ -170,7 +200,7 @@ impl<T: Tun, B: Bind> Wireguard<T, B> {
         }
     }
 
-    pub fn new_peer(&self, pk: PublicKey) -> Peer<T, B> {
+    pub fn new_peer(&self, pk: PublicKey) {
         let state = Arc::new(PeerInner {
             pk,
             last_handshake: Mutex::new(SystemTime::UNIX_EPOCH),
@@ -182,8 +212,13 @@ impl<T: Tun, B: Bind> Wireguard<T, B> {
             timers: RwLock::new(Timers::dummy(&self.runner)),
         });
 
+        // create a router peer
         let router = Arc::new(self.state.router.new_peer(state.clone()));
 
+        // add to the handshake device
+        self.state.handshake.write().device.add(pk).unwrap(); // TODO: handle adding of public key for interface
+
+        // form WireGuard peer
         let peer = Peer { router, state };
 
         /* The need for dummy timers arises from the chicken-egg
@@ -193,7 +228,10 @@ impl<T: Tun, B: Bind> Wireguard<T, B> {
          * TODO: Consider the ease of using atomic pointers instead.
          */
         *peer.timers.write() = Timers::new(&self.runner, peer.clone());
-        peer
+
+        // finally, add the peer to the wireguard device
+        let mut peers = self.state.peers.write();
+        peers.entry(*pk.as_bytes()).or_insert(peer);
     }
 
     /* Begin consuming messages from the reader.
@@ -417,7 +455,7 @@ impl<T: Tun, B: Bind> Wireguard<T, B> {
         }
 
         Wireguard {
-            state: wg,
+            state: WireguardHandle { inner: wg },
             runner: Runner::new(TIMERS_TICK, TIMERS_SLOTS, TIMERS_CAPACITY),
         }
     }