early, early rough draft

10 files changed, 2196 insertions, 0 deletions

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new file mode 100644
index 0000000..5764a2e
--- /dev/null
+++ b/Cargo.toml
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+version = "0.6.0"
+authors = ["Jake McGinty <me@jake.su>"]
+license = "GPL-3.0"
+repository = "https://git.zx2c4.com/wireguard-rs/"
+description = "Userspace implementation of WireGuard, a fast, modern and secure VPN tunnel."
+
+[dependencies]
+blake2-rfc = "0.2"
+byteorder = "^1.2"
+structopt = "^0.1"
+structopt-derive = "^0.1"
+daemonize = "0.2"
+error-chain = "^0.11"
+rand = "^0.4"
+libc = "0.2"
+nix = "0.9"
+rustc-serialize = "0.3.22"
+tai64 = { git = "https://github.com/sopium/tai64" }
+treebitmap = { git = "https://github.com/sopium/treebitmap" }
+chashmap = "^2.2"
+
+env_logger = "^0.4"
+log = "^0.3"
+
+mio = "^0.6"
+mio-uds = "^0.6"
+bytes = "0.4"
+futures = "0.1"
+tokio-io = "0.1"
+tokio-core = "0.1"
+tokio-proto = "0.1"
+tokio-service = "0.1"
+tokio-uds = "0.1"
+tokio-uds-proto = "0.1"
+tokio-utun = "0.1"
+tokio-timer = "^0.1"
+
+snow = "^0.1.8-preview"
+base64 = "^0.5"
+hex = "^0.3"
+rust-crypto = "*"
+time = "*"
+pnet = "*"
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..4492444
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,27 @@
+use daemonize;
+use std::io;
+
+    error_chain! {
+        foreign_links {
+            Io(io::Error) #[doc = "Error during IO"];
+            Daemonize(daemonize::DaemonizeError) #[doc = "Error during IO"];
+        }
+
+        errors {
+//            Launch(phase: LaunchStage) {
+//                description("An error occurred during startup")
+//                display("Startup aborted: {:?} did not complete successfully", phase)
+//            }
+//
+//            ConfigLoad(path: String) {
+//                description("Config file not found")
+//                display("Unable to read file `{}`", path)
+//            }
+        }
+    }
+
+//    impl From<LaunchStage> for ErrorKind {
+//        fn from(v: LaunchStage) -> Self {
+//            ErrorKind::Launch(v)
+//        }
+//    }
diff --git a/src/interface/config.rs b/src/interface/config.rs
new file mode 100644
index 0000000..6a76a23
--- /dev/null
+++ b/src/interface/config.rs
@@ -0,0 +1,300 @@
+//! The configuration logic for userspace WireGuard.
+
+// Dev notes:
+// * Configuration service should use channels to report updates it receives over its interface.
+
+use bytes::BytesMut;
+use error::Result;
+use std;
+use std::fs::{create_dir, remove_file};
+use std::iter::Iterator;
+use std::path::{Path, PathBuf};
+use std::io;
+use std::str;
+use std::net::{SocketAddr, IpAddr};
+use types::{PeerInfo, InterfaceInfo};
+use hex::{FromHex};
+
+use futures::{Future, Stream};
+use futures::unsync::mpsc;
+use tokio_io::{AsyncRead, AsyncWrite};
+use tokio_io::codec::{Encoder, Decoder};
+
+#[derive(Debug)]
+pub enum Command {
+    Set(usize, Vec<UpdateEvent>),
+    Get(usize)
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub enum UpdateEvent {
+    PrivateKey([u8; 32]),
+    ListenPort(u16),
+    UpdatePeer(PeerInfo),
+    RemovePeer([u8; 32]),
+    RemoveAllPeers,
+}
+
+impl UpdateEvent {
+    fn from(items: Vec<(String, String)>) -> Vec<UpdateEvent> {
+        let mut events = vec![];
+        let mut public_key: Option<[u8; 32]> = None;
+        let mut preshared_key: Option<[u8; 32]> = None;
+        let mut allowed_ips: Vec<(IpAddr, u32)> = vec![];
+        let mut keep_alive_interval: Option<u16> = None;
+        let mut endpoint: Option<SocketAddr> = None;
+
+        for (key, value) in items {
+            match key.as_ref() {
+                "private_key" => {
+                    let key = <[u8; 32]>::from_hex(&value).unwrap();
+                    events.push(UpdateEvent::PrivateKey(key));
+                },
+                "listen_port" => { events.push(UpdateEvent::ListenPort(value.parse().unwrap())); },
+                "public_key" => {
+                    if let Some(ref pubkey) = public_key {
+                        events.push(UpdateEvent::UpdatePeer(PeerInfo {
+                            pub_key: pubkey.clone(),
+                            psk: preshared_key.clone(),
+                            endpoint: endpoint.clone(),
+                            allowed_ips: allowed_ips.clone(),
+                            keep_alive_interval: keep_alive_interval.clone(),
+                        }));
+                    }
+                    let key = <[u8; 32]>::from_hex(&value).unwrap();
+                    public_key = Some(key);
+                },
+                "preshared_key" => { preshared_key = Some(<[u8; 32]>::from_hex(&value).unwrap()); },
+                "allowed_ip" => {
+                    let (ip, cidr) = value.split_at(value.find('/').unwrap());
+                    allowed_ips.push((ip.parse().unwrap(), (&cidr[1..]).parse().unwrap()))
+                },
+                "persistent_keepalive_interval" => {
+                    keep_alive_interval = Some(value.parse().unwrap());
+                },
+                "endpoint" => { endpoint = Some(value.parse().unwrap()); },
+                _ => {}
+            }
+        }
+
+        if let Some(ref pubkey) = public_key {
+            events.push(UpdateEvent::UpdatePeer(PeerInfo {
+                pub_key: pubkey.clone(),
+                psk: preshared_key.clone(),
+                endpoint: endpoint.clone(),
+                allowed_ips: allowed_ips.clone(),
+                keep_alive_interval: keep_alive_interval.clone(),
+            }));
+        }
+        debug!("events {:?}", events);
+        events
+    }
+}
+
+pub struct ConfigurationCodec;
+
+impl Decoder for ConfigurationCodec {
+    type Item = Command;
+    type Error = io::Error;
+
+    fn decode(&mut self, buf: &mut BytesMut) -> std::result::Result<Option<Self::Item>, Self::Error> {
+        // Determine we have a full command ready for parsing.
+        let mut items = Vec::new();
+        let utf8 = String::from_utf8(buf.to_vec()).unwrap();
+        let mut data_iter = utf8.split("\n\n");
+        let blob = data_iter.next().unwrap();
+        if data_iter.next().is_none() {
+            return Ok(None)
+        }
+
+        // Parse the key-value pairs into something more usable
+        for line in blob.split('\n') {
+            let mut entry = line.split('=');
+            items.push((entry.next().unwrap().to_owned(), entry.next().unwrap().to_owned()));
+        }
+        buf.split_to(blob.len()+1);
+
+        let (ref cmd, ref version) = items.remove(0);
+        let command = if cmd == "get" {
+            Command::Get(version.parse().unwrap())
+        } else {
+            Command::Set(version.parse().unwrap(), UpdateEvent::from(items))
+        };
+
+        Ok(Some(command))
+    }
+}
+
+impl Encoder for ConfigurationCodec {
+    type Item = String;
+    type Error = io::Error;
+
+    fn encode(&mut self, msg: Self::Item, buf: &mut BytesMut) -> std::result::Result<(), Self::Error> {
+        buf.extend(msg.as_bytes());
+        buf.extend(b"\n\n");
+        Ok(())
+    }
+}
+
+
+//pub struct ConfigurationService {
+//    interface_name: String,
+//    peers: Rc<RefCell<HashMap<[u8; 32], Rc<RefCell<Peer>>>>>,
+//    interface_info: Rc<RefCell<InterfaceInfo>>,
+//    tx: mpsc::Sender<UpdateEvent>,
+//}
+
+//impl Service for ConfigurationService {
+//    type Request = Command;
+//    type Response = String;
+//    type Error = io::Error;
+//    type Future = Box<Future<Item=Self::Response, Error=Self::Error>>;
+//
+//    fn call(&self, req: Self::Request) -> Self::Future {
+//        debug!("{:?}", req);
+//        match req {
+//            Command::Get(version) => {
+//                // see: https://www.wireguard.com/xplatform/
+//                // this is just bullshit fillin
+//                let buf = "private_key=e84b5a6d2717c1003a13b431570353dbaca9146cf150c5f8575680feba52027a
+//listen_port=12912
+//public_key=b85996fecc9c7f1fc6d2572a76eda11d59bcd20be8e543b15ce4bd85a8e75a33
+//preshared_key=188515093e952f5f22e865cef3012e72f8b5f0b598ac0309d5dacce3b70fcf52
+//allowed_ip=192.168.4.4/32
+//endpoint=[abcd:23::33%2]:51820
+//public_key=58402e695ba1772b1cc9309755f043251ea77fdcf10fbe63989ceb7e19321376
+//tx_bytes=38333
+//rx_bytes=2224
+//allowed_ip=192.168.4.6/32
+//persistent_keepalive_interval=111
+//endpoint=182.122.22.19:3233
+//public_key=662e14fd594556f522604703340351258903b64f35553763f19426ab2a515c58
+//endpoint=5.152.198.39:51820
+//allowed_ip=192.168.4.10/32
+//allowed_ip=192.168.4.11/32
+//tx_bytes=1212111
+//rx_bytes=1929999999
+//errno=0
+//\n";
+//                Box::new(future::ok(buf.into()))
+//            },
+//            Command::Set(version, items) => {
+//                let mut public_key = None;
+//                let mut preshared_key = None;
+//                let mut allowed_ips: Vec<(IpAddr, u32)> = vec![];
+//                let mut persistent_keepalive_interval: Option<u16> = None;
+//                let mut endpoint: Option<SocketAddr> = None;
+//
+//                for (key, value) in items {
+//                    match key.as_ref() {
+////                        "private_key" => { config.key = Some(value); },
+////                        "fwmark" => { config.fwmark = Some(value.parse().unwrap()); },
+////                        "listen_port" => { config.listen_port = Some(value.parse().unwrap()); },
+//                        "public_key" => {
+//                            if let Some(ref pubkey) = public_key {
+////                                config.peers.push(Peer {
+////                                    peer_pubkey: [0u8; 32],
+////                                    psk: preshared_key,
+////                                    endpoint: endpoint,
+////                                    allowed_ips: allowed_ips.clone(),
+////                                    keep_alive_interval: persistent_keepalive_interval,
+////                                });
+//                            }
+//                            public_key = Some(value);
+//                        },
+//                        "preshared_key" => { preshared_key = Some([0u8; 32]); },
+//                        "allowed_ip" => {
+//                            let (ip, cidr) = value.split_at(value.find('/').unwrap());
+//                            debug!("parsed allowed ip as ({}, {})", ip, &cidr[1..]);
+//                            allowed_ips.push((ip.parse().unwrap(), (&cidr[1..]).parse().unwrap()))
+//                        },
+//                        "persistent_keepalive_interval" => {
+//                            debug!("persistent_keepalive_interval");
+//                            persistent_keepalive_interval = Some(value.parse().unwrap());
+//                        },
+//                        "endpoint" => { endpoint = Some(value.parse().unwrap()); },
+//                        _ => {}
+//                    }
+//                }
+//                Box::new(future::ok("errno=0\nerrno=0\n\n".into()))
+//            },
+//            _ => {
+//                Box::new(future::ok("errno=1\nerrno=1\n\n".into()))
+//            }
+//        }
+//    }
+//}
+
+pub struct ConfigurationServiceManager {
+    interface_name: String,
+}
+
+impl ConfigurationServiceManager {
+    pub fn new(interface_name: &str) -> Self {
+        ConfigurationServiceManager {
+            interface_name: interface_name.into(),
+        }
+    }
+
+    /// Creates a new `WireGuard` instance
+    pub fn get_path(name: &str) -> Result<PathBuf> {
+        //        let _tun = Tun::create(Some("hey"));
+        // Create the socket directory if not existing
+        let mut socket_path = Self::get_run_path().join("wireguard");
+
+        if !socket_path.exists() {
+            debug!("Creating socket path: {}", socket_path.display());
+            create_dir(&socket_path)?;
+        }
+        debug!("Setting chmod 0700 of socket path: {}",
+               socket_path.display());
+        Self::chmod(&socket_path, 0o700)?;
+
+        // Finish the socket path
+        socket_path.push(&name);
+        socket_path.set_extension("sock");
+        if socket_path.exists() {
+            debug!("Removing existing socket: {}", socket_path.display());
+            remove_file(&socket_path)?;
+        }
+
+        Ok(socket_path)
+    }
+
+    #[cfg(unix)]
+    /// Sets the permissions to a given `Path`
+    fn chmod(path: &Path, perms: u32) -> Result<()> {
+        use std::os::unix::prelude::PermissionsExt;
+        use std::fs::{set_permissions, Permissions};
+        set_permissions(path, Permissions::from_mode(perms))?;
+        Ok(())
+    }
+
+    #[cfg(windows)]
+    /// Sets the permissions to a given `Path`
+    fn chmod(_path: &Path, _perms: u32) -> Result<()> {
+        Ok(())
+    }
+
+    /// Returns the path where the socket and pid file will be stored
+    pub fn get_run_path() -> PathBuf {
+        if Path::new("/run").exists() {
+            PathBuf::from("/run")
+        } else {
+            PathBuf::from("/var").join("run")
+        }
+    }
+}
+
+impl Drop for ConfigurationServiceManager {
+    fn drop(&mut self) {
+        let mut socket_path = Self::get_run_path().join("wireguard");
+        socket_path.push(&self.interface_name);
+        socket_path.set_extension("sock");
+        if socket_path.exists() {
+            debug!("Removing socket on drop: {}", socket_path.display());
+            let _ = remove_file(&socket_path);
+        }
+    }
+}
diff --git a/src/interface/mod.rs b/src/interface/mod.rs
new file mode 100644
index 0000000..8cbbfb3
--- /dev/null
+++ b/src/interface/mod.rs
@@ -0,0 +1,317 @@
+mod config;
+
+use self::config::{ConfigurationServiceManager, UpdateEvent, Command, ConfigurationCodec};
+use base64;
+use hex;
+use byteorder::{ByteOrder, BigEndian, LittleEndian};
+use snow::NoiseBuilder;
+use protocol::Peer;
+use std::io;
+use std::rc::Rc;
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::time::Duration;
+use types::{InterfaceInfo};
+
+use pnet::packet::ipv4::Ipv4Packet;
+
+use futures::{Future, Stream, Sink, future, unsync, sync, stream};
+use tokio_core::reactor::{Core, Handle};
+use tokio_core::net::{UdpSocket, UdpCodec};
+use tokio_utun::{UtunStream, UtunCodec};
+use tokio_io::{AsyncRead};
+use tokio_io::codec::{Framed, Encoder, Decoder};
+use tokio_uds::{UnixListener};
+use tokio_timer::{Interval, Timer};
+
+fn debug_packet(header: &str, packet: &[u8]) {
+    let packet = Ipv4Packet::new(packet);
+    debug!("{} {:?}", header, packet);
+}
+
+pub struct Interface {
+    name: String,
+    info: Rc<RefCell<InterfaceInfo>>,
+    peers: Rc<RefCell<HashMap<[u8; 32], Rc<RefCell<Peer>>>>>,
+    ids: Rc<RefCell<HashMap<u32, Rc<RefCell<Peer>>>>>,
+}
+
+struct VecUdpCodec;
+impl UdpCodec for VecUdpCodec {
+    type In = (SocketAddr, Vec<u8>);
+    type Out = (SocketAddr, Vec<u8>);
+
+    fn decode(&mut self, src: &SocketAddr, buf: &[u8]) -> io::Result<Self::In> {
+        Ok((*src, buf.to_vec()))
+    }
+
+    fn encode(&mut self, msg: Self::Out, buf: &mut Vec<u8>) -> SocketAddr {
+        let (addr, mut data) = msg;
+        buf.append(&mut data);
+        addr
+    }
+}
+
+struct VecUtunCodec;
+#[allow(dead_code)]
+enum UtunPacket {
+    Inet4(Vec<u8>),
+    Inet6(Vec<u8>),
+}
+impl UtunCodec for VecUtunCodec {
+    type In = Vec<u8>;
+    type Out = Vec<u8>;
+
+    fn decode(&mut self, buf: &[u8]) -> io::Result<Self::In> {
+        debug!("utun packet type {}", buf[3]);
+        Ok(buf[4..].to_vec())
+    }
+
+    fn encode(&mut self, mut msg: Self::Out, buf: &mut Vec<u8>) {
+        buf.extend_from_slice(&[0u8, 0, 0, 2]);
+        buf.append(&mut msg);
+    }
+}
+
+impl Interface {
+    pub fn new(name: &str) -> Self {
+        let info = Rc::new(RefCell::new(InterfaceInfo::default()));
+        let peers = Rc::new(RefCell::new(HashMap::new()));
+        let ids = Rc::new(RefCell::new(HashMap::new()));
+        let _config_service = ConfigurationServiceManager::new(name);
+        Interface {
+            name: name.to_owned(),
+            info,
+            peers,
+            ids,
+        }
+    }
+
+    pub fn start(&mut self) {
+        let mut core = Core::new().unwrap();
+
+        let (utun_tx, utun_rx) = unsync::mpsc::channel::<Vec<u8>>(1024);
+        let udp_socket = UdpSocket::bind(&([0,0,0,0], 0).into(), &core.handle()).unwrap();
+        let (tx, rx) = unsync::mpsc::channel::<(SocketAddr, Vec<u8>)>(1024);
+        let (udp_writer, udp_reader) = udp_socket.framed(VecUdpCodec{}).split();
+        let udp_read_fut = udp_reader.for_each({
+            let ids_ref = self.ids.clone();
+            let handle = core.handle();
+            let tx = tx.clone();
+            let interface_info = self.info.clone();
+            move |(_socket_addr, packet)| {
+                debug!("got a UDP packet of length {}, packet type {}", packet.len(), packet[0]);
+                match packet[0] {
+                    1 => {
+                        info!("got handshake initialization.");
+                    },
+                    2 => {
+                        let their_index = LittleEndian::read_u32(&packet[4..]);
+                        let our_index = LittleEndian::read_u32(&packet[8..]);
+                        let mut ids = ids_ref.borrow_mut();
+                        let peer_ref = ids.get(&our_index).unwrap().clone();
+                        let mut peer = peer_ref.borrow_mut();
+                        peer.sessions.next.as_mut().unwrap().their_index = their_index;
+                        let payload_len = peer.next_noise().expect("pending noise session")
+                            .read_message(&packet[12..60], &mut []).unwrap();
+                        assert!(payload_len == 0);
+                        peer.ratchet_session().unwrap();
+                        info!("got handshake response, ratcheted session.");
+                        let tx = tx.clone();
+
+                        let interface_info = interface_info.borrow();
+                        let noise = NoiseBuilder::new("Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s".parse().unwrap())
+                            .local_private_key(&interface_info.private_key.expect("no private key!"))
+                            .remote_public_key(&peer.info.pub_key)
+                            .prologue("WireGuard v1 zx2c4 Jason@zx2c4.com".as_bytes())
+                            .psk(2, &peer.info.psk.expect("no psk!"))
+                            .build_initiator().unwrap();
+                        peer.set_next_session(noise.into());
+
+                        let _ = ids.insert(peer.our_next_index().unwrap(), peer_ref.clone());
+
+                        let init_packet = peer.get_handshake_packet();
+                        let endpoint = peer.info.endpoint.unwrap().clone();
+
+                        let timer = Timer::default();
+                        let sleep = timer.sleep(Duration::from_secs(120));
+                        let boop = sleep.and_then({
+                            let handle = handle.clone();
+                            let peer_ref = peer_ref.clone();
+                            let interface_info = interface_info.clone();
+                            move |_| {
+                                info!("sending rekey!");
+                                handle.spawn(tx.clone().send((endpoint, init_packet))
+                                    .map(|_| ())
+                                    .map_err(|_| ()));
+                                Ok(())
+                            }
+                        }).map_err(|_|());
+                        handle.spawn(boop);
+                    },
+                    4 => {
+                        let our_index_received = LittleEndian::read_u32(&packet[4..]);
+                        let nonce = LittleEndian::read_u64(&packet[8..]);
+
+                        let mut raw_packet = [0u8; 1500];
+                        let ids = ids_ref.borrow();
+                        let lookup = ids.get(&our_index_received);
+                        if let Some(ref peer) = lookup {
+                            let mut peer = peer.borrow_mut();
+                            // info!("retrieved peer with pubkey {}", base64::encode(&peer.pubkey));
+                            // info!("ok going to try to decrypt");
+
+                            peer.rx_bytes += packet.len();
+                            let noise = peer.current_noise().expect("current noise session");
+                            noise.set_receiving_nonce(nonce).unwrap();
+                            let payload_len = noise.read_message(&packet[16..], &mut raw_packet).unwrap();
+                            debug_packet("received TRANSPORT: ", &raw_packet[..payload_len]);
+                            handle.spawn(utun_tx.clone().send(raw_packet[..payload_len].to_owned())
+                                .map(|_| ())
+                                .map_err(|_| ()));
+                        }
+                    },
+                    _ => unimplemented!()
+                }
+                Ok(())
+            }
+        }).map_err(|_| ());
+
+        let udp_write_fut = udp_writer.sink_map_err(|_| ()).send_all(
+            rx.map(|(addr, packet)| {
+                debug!("sending encrypted UDP packet");
+                (addr, packet)
+            }).map_err(|_| ())).map_err(|_| ());
+
+        let utun_stream = UtunStream::connect(&self.name, &core.handle()).unwrap().framed(VecUtunCodec{});
+        let (utun_writer, utun_reader) = utun_stream.split();
+        let utun_fut = utun_reader.for_each({
+            let ids = self.ids.clone();
+            let utun_handle = core.handle();
+            let udp_tx = tx.clone();
+            move |packet| {
+                debug_packet("received UTUN packet: ", &packet);
+                let mut ping_packet = [0u8; 1500];
+                let ids = ids.borrow();
+                let (_key, peer) = ids.iter().next().unwrap(); // TODO destination IP peer lookup
+                let mut peer = peer.borrow_mut();
+                ping_packet[0] = 4;
+                let their_index = peer.their_current_index().expect("no current index for them");
+                let endpoint = peer.info.endpoint.unwrap();
+                peer.tx_bytes += packet.len();
+                let noise = peer.current_noise().expect("current noise session");
+                LittleEndian::write_u32(&mut ping_packet[4..], their_index);
+                LittleEndian::write_u64(&mut ping_packet[8..], noise.sending_nonce().unwrap());
+                let len = noise.write_message(&packet, &mut ping_packet[16..]).expect("failed to encrypt outgoing UDP packet");
+                utun_handle.spawn(udp_tx.clone().send((endpoint, ping_packet[..(16+len)].to_owned()))
+                    .map(|_| ())
+                    .map_err(|_| ()));
+                Ok(())
+            }
+        }).map_err(|_| ());
+
+        let utun_write_fut = utun_writer.sink_map_err(|_| ()).send_all(
+            utun_rx.map(|packet| {
+                debug_packet("sending UTUN: ", &packet);
+                packet
+            }).map_err(|_| ())).map_err(|_| ());
+
+        let handle = core.handle();
+        let listener = UnixListener::bind(ConfigurationServiceManager::get_path(&self.name).unwrap(), &handle).unwrap();
+        let (config_tx, config_rx) = sync::mpsc::channel::<UpdateEvent>(1024);
+        let h = handle.clone();
+        let config_server = listener.incoming().for_each({
+            let config_tx = config_tx.clone();
+            let info = self.info.clone();
+            let peers = self.peers.clone();
+            move |(stream, _)| {
+                let (sink, stream) = stream.framed(ConfigurationCodec {}).split();
+                debug!("UnixServer connection.");
+
+                let handle = h.clone();
+                let responses = stream.and_then({
+                    let config_tx = config_tx.clone();
+                    let info = info.clone();
+                    let peers = peers.clone();
+                    move |command| {
+                        match command {
+                            Command::Set(_version, items) => {
+                                config_tx.clone().send_all(stream::iter_ok(items)).wait().unwrap();
+                                future::ok("errno=0\nerrno=0\n\n".to_string())
+                            },
+                            Command::Get(_version) => {
+                                let info = info.borrow();
+                                let peers = peers.borrow();
+                                let mut s = String::new();
+                                if let Some(private_key) = info.private_key {
+                                    s.push_str(&format!("private_key={}\n", hex::encode(private_key)));
+                                }
+
+                                for (_, peer) in peers.iter() {
+                                    s.push_str(&peer.borrow().to_config_string());
+                                }
+                                future::ok(format!("{}errno=0\n\n", s))
+                            }
+                        }
+                    }
+                });
+
+                let fut = sink.send_all(responses).map(|_| ()).map_err(|_| ());
+
+                handle.spawn(fut);
+
+                Ok(())
+            }
+        }).map_err(|_| ());
+
+        let config_fut = config_rx.for_each({
+            let tx = tx.clone();
+            let handle = handle.clone();
+            move |event| {
+                let interface_info = self.info.clone();
+                match event {
+                    UpdateEvent::PrivateKey(private_key) => {
+                        let mut interface_info = interface_info.borrow_mut();
+                        interface_info.private_key = Some(private_key);
+                        debug!("set new private key");
+                    },
+                    UpdateEvent::ListenPort(port) => {
+                        let mut interface_info = interface_info.borrow_mut();
+                        interface_info.listen_port = Some(port);
+                        debug!("set new listen port");
+                    },
+                    UpdateEvent::UpdatePeer(info) => {
+                        info!("added new peer: {}", info);
+                        let interface_info = interface_info.borrow();
+                        let mut noise = NoiseBuilder::new("Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s".parse().unwrap())
+                            .local_private_key(&interface_info.private_key.expect("no private key!"))
+                            .remote_public_key(&info.pub_key)
+                            .prologue("WireGuard v1 zx2c4 Jason@zx2c4.com".as_bytes())
+                            .psk(2, &info.psk.expect("no psk!"))
+                            .build_initiator().unwrap();
+
+                        let mut peer = Peer::new(info.clone());
+                        peer.set_next_session(noise.into());
+
+                        let init_packet = peer.get_handshake_packet();
+                        let our_index = peer.our_next_index().unwrap();
+                        let peer = Rc::new(RefCell::new(peer));
+
+                        let _ = self.ids.borrow_mut().insert(our_index, peer.clone());
+                        let _ = self.peers.borrow_mut().insert(info.pub_key, peer);
+
+                        handle.spawn(tx.clone().send((info.endpoint.unwrap(), init_packet))
+                            .map(|_| ())
+                            .map_err(|_| ()));
+                    },
+                    _ => unimplemented!()
+                }
+
+                future::ok(())
+            }
+        }).map_err(|_| ());
+
+        core.run(utun_fut.join(utun_write_fut.join(udp_read_fut.join(udp_write_fut.join(config_fut.join(config_server)))))).unwrap();
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..0f3f9e4
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,100 @@
+#![allow(unused_imports)]
+
+#[macro_use] extern crate log;
+extern crate env_logger;
+
+#[macro_use] extern crate structopt_derive;
+#[macro_use] extern crate error_chain;
+
+
+extern crate daemonize;
+extern crate rand;
+extern crate nix;
+extern crate structopt;
+
+extern crate mio;
+
+extern crate bytes;
+extern crate futures;
+extern crate tokio_core;
+extern crate tokio_io;
+extern crate tokio_proto;
+extern crate tokio_service;
+extern crate tokio_uds;
+extern crate tokio_utun;
+extern crate tokio_timer;
+
+extern crate snow;
+extern crate base64;
+extern crate hex;
+extern crate time;
+extern crate byteorder;
+extern crate crypto;
+extern crate pnet;
+
+mod error;
+mod interface;
+mod protocol;
+mod types;
+
+use daemonize::Daemonize;
+use error::{ErrorKind, Error, Result};
+use std::path::PathBuf;
+use interface::Interface;
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "wgrs", about = "WireGuard - a network tunnel")]
+struct Opt {
+    /// A flag, true if used in the command line.
+    #[structopt(short = "d", long = "debug", help = "Activate debug mode")]
+    debug: bool,
+
+    /// An argument of type float, with a default value.
+    #[structopt(short = "f", long = "foreground", help = "Run in the foreground")]
+    foreground: bool,
+
+    /// Needed parameter, the first on the command line.
+    #[structopt(help = "WireGuard interface name", default_value = "utun4")]
+    interface: String,
+
+    /// An optional parameter, will be `None` if not present on the
+    /// command line.
+    #[structopt(help = "Output file, stdout if not present")]
+    output: Option<String>,
+}
+
+fn main() {
+    env_logger::init().unwrap();
+    let opt = Opt::from_args();
+
+    if !opt.foreground {
+        daemonize().expect("failed to daemonize");
+    }
+
+    Interface::new(&opt.interface).start();
+//    WireGuard::start(interface_name).expect("failed to start WireGuard interface");
+}
+
+fn daemonize() -> Result<()> {
+    if !nix::unistd::getuid().is_root() {
+        bail!("You are not the root user which can spawn the daemon.");
+    }
+
+    debug!("Starting daemon.");
+
+    let pid_path = PathBuf::new(); // TODO temporary
+
+//    let pid_path = WireGuard::get_run_path();
+
+    let daemonize = Daemonize::new()
+        .pid_file(pid_path.join("wireguard.pid"))
+        .chown_pid_file(true)
+        .working_directory(pid_path)
+        .user("nobody")
+        .group("daemon")
+        .umask(0o077);
+
+    daemonize.start()?;
+    Ok(())
+}
diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
new file mode 100644
index 0000000..bae5340
--- /dev/null
+++ b/src/protocol/mod.rs
@@ -0,0 +1,3 @@
+mod peer;
+
+pub use self::peer::Peer;
diff --git a/src/protocol/peer.rs b/src/protocol/peer.rs
new file mode 100644
index 0000000..e26e1bf
--- /dev/null
+++ b/src/protocol/peer.rs
@@ -0,0 +1,189 @@
+use byteorder::{ByteOrder, BigEndian, LittleEndian};
+use crypto::blake2s::Blake2s;
+use snow::{self, NoiseBuilder};
+use pnet::packet::Packet;
+use pnet::packet::ip::IpNextHeaderProtocols;
+use pnet::packet::ipv4::{self, MutableIpv4Packet};
+use pnet::packet::icmp::{self, MutableIcmpPacket, IcmpTypes, echo_reply, echo_request};
+use std::{self, io};
+use std::fmt::{self, Debug, Display, Formatter};
+use std::net::{Ipv4Addr, IpAddr, SocketAddr, ToSocketAddrs};
+use std::str::FromStr;
+use std::thread::JoinHandle;
+use base64;
+use hex;
+use time;
+use rand::{self, Rng};
+use types::PeerInfo;
+
+use futures::{self, Future};
+use tokio_core::reactor::Handle;
+use tokio_core::net::{UdpSocket, UdpCodec};
+
+pub struct Peer {
+    pub info: PeerInfo,
+    pub sessions: Sessions,
+    pub tx_bytes: usize,
+    pub rx_bytes: usize,
+}
+
+pub struct Session {
+    pub noise: snow::Session,
+    pub our_index: u32,
+    pub their_index: u32,
+}
+
+impl Session {
+    #[allow(dead_code)]
+    pub fn with_their_index(session: snow::Session, their_index: u32) -> Session {
+        Session {
+            noise: session,
+            our_index: rand::thread_rng().gen::<u32>(),
+            their_index,
+        }
+    }
+
+    pub fn into_transport_mode(self) -> Session {
+        Session {
+            noise: self.noise.into_transport_mode().unwrap(),
+            our_index: self.our_index,
+            their_index: self.their_index,
+        }
+    }
+}
+
+impl From<snow::Session> for Session {
+    fn from(session: snow::Session) -> Self {
+        Session {
+            noise: session,
+            our_index: 0,
+            their_index: 0,
+        }
+    }
+}
+
+pub struct Sessions {
+    pub past: Option<Session>,
+    pub current: Option<Session>,
+    pub next: Option<Session>,
+}
+
+impl Display for Peer {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "Peer({})", self.info)
+    }
+}
+
+impl Debug for Peer {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "Peer( endpoint: {:?}, pubkey: [redacted], psk: [redacted] )", self.info.endpoint)
+    }
+}
+
+fn memcpy(out: &mut [u8], data: &[u8]) {
+    out[..data.len()].copy_from_slice(data);
+}
+
+impl Peer {
+    pub fn new(info: PeerInfo) -> Peer {
+        Peer {
+            info,
+            sessions: Sessions {
+                past: None,
+                current: None,
+                next: None
+            },
+            tx_bytes: 0,
+            rx_bytes: 0,
+        }
+    }
+
+    pub fn set_next_session(&mut self, session: Session) {
+        let _ = std::mem::replace(&mut self.sessions.next, Some(session));
+    }
+
+    pub fn ratchet_session(&mut self) -> Result<(), ()> {
+        let next = std::mem::replace(&mut self.sessions.next, None).ok_or(())?;
+        let next = next.into_transport_mode();
+
+        let current = std::mem::replace(&mut self.sessions.current, Some(next));
+        let _       = std::mem::replace(&mut self.sessions.past,    current);
+        Ok(())
+    }
+
+    pub fn current_noise(&mut self) -> Option<&mut snow::Session> {
+        if let Some(ref mut session) = self.sessions.current {
+            Some(&mut session.noise)
+        } else {
+            None
+        }
+    }
+
+    pub fn next_noise(&mut self) -> Option<&mut snow::Session> {
+        if let Some(ref mut session) = self.sessions.next {
+            Some(&mut session.noise)
+        } else {
+            None
+        }
+    }
+
+    pub fn our_next_index(&self) -> Option<u32> {
+        if let Some(ref session) = self.sessions.next {
+            Some(session.our_index)
+        } else {
+            None
+        }
+    }
+
+    pub fn our_current_index(&self) -> Option<u32> {
+        if let Some(ref session) = self.sessions.current {
+            Some(session.our_index)
+        } else {
+            None
+        }
+    }
+
+    pub fn their_current_index(&self) -> Option<u32> {
+        if let Some(ref session) = self.sessions.current {
+            Some(session.their_index)
+        } else {
+            None
+        }
+    }
+
+    pub fn get_handshake_packet(&mut self) -> Vec<u8> {
+        let now = time::get_time();
+        let mut tai64n = [0; 12];
+        BigEndian::write_i64(&mut tai64n[0..], 4611686018427387914 + now.sec);
+        BigEndian::write_i32(&mut tai64n[8..], now.nsec);
+        let mut initiation_packet = vec![0; 148];
+        initiation_packet[0] = 1; /* Type: Initiation */
+        initiation_packet[1] = 0; /* Reserved */
+        initiation_packet[2] = 0; /* Reserved */
+        initiation_packet[3] = 0; /* Reserved */
+        LittleEndian::write_u32(&mut initiation_packet[4..], self.our_next_index().unwrap());
+        self.sessions.next.as_mut().unwrap().noise.write_message(&tai64n, &mut initiation_packet[8..]).unwrap();
+        let mut mac_key_input = [0; 40];
+        let mut mac_key = [0; 32];
+        memcpy(&mut mac_key_input, b"mac1----");
+        memcpy(&mut mac_key_input[8..], &self.info.pub_key);
+        Blake2s::blake2s(&mut mac_key, &mac_key_input, &[0; 0]);
+        let mut mac = [0; 16];
+        Blake2s::blake2s(&mut mac, &initiation_packet[0..116], &mac_key);
+        memcpy(&mut initiation_packet[116..], &mac);
+
+        initiation_packet
+    }
+
+    pub fn to_config_string(&self) -> String {
+        let mut s = format!("public_key={}\n", hex::encode(&self.info.pub_key));
+        if let Some(ref psk) = self.info.psk {
+            s.push_str(&format!("preshared_key={}\n", hex::encode(psk)));
+        }
+        if let Some(ref endpoint) = self.info.endpoint {
+            s.push_str(&format!("endpoint={}:{}\n", endpoint.ip().to_string(),endpoint.port()));
+        }
+        s.push_str(&format!("tx_bytes={}\nrx_bytes={}\n", self.tx_bytes, self.rx_bytes));
+        s
+    }
+}
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..29b02bb
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,107 @@
+use base64;
+use std::io::{self, Cursor, Read, Write};
+use byteorder::{BigEndian, LittleEndian, WriteBytesExt, ReadBytesExt};
+use std::fmt::{self, Display, Formatter};
+use std::net::{Ipv4Addr, IpAddr, SocketAddr};
+
+#[derive(Clone, Debug)]
+pub struct PeerInfo {
+    pub pub_key: [u8; 32],
+    pub psk: Option<[u8; 32]>,
+    pub endpoint: Option<SocketAddr>,
+    pub allowed_ips: Vec<(IpAddr, u32)>,
+    pub keep_alive_interval: Option<u16>,
+}
+
+impl Display for PeerInfo {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let encoded = base64::encode(&self.pub_key);
+        write!(f, "{}...{}", &encoded[..4], &encoded[encoded.len()-4..])
+    }
+}
+
+#[derive(Clone, Debug, Default)]
+pub struct InterfaceInfo {
+    pub private_key: Option<[u8; 32]>,
+    pub pub_key: Option<[u8; 32]>,
+    pub listen_port: Option<u16>,
+}
+
+pub enum Message {
+    HandshakeInitiation(HandshakeInitiationMessage),
+//    HandshakeResponse(HandshakeResponseMessage),
+//    Transport(TransportMessage),
+//    CookieReply(CookieReplyMessage),
+    Other(Vec<u8>)
+}
+
+// TODO use TryFrom
+impl<'a> From<&'a [u8]> for Message {
+    fn from(bytes: &'a [u8]) -> Self {
+        use self::Message::*;
+        let mut cursor = Cursor::new(bytes);
+        match cursor.read_u8().unwrap() {
+            1 => HandshakeInitiation(HandshakeInitiationMessage::from(&bytes[4..])),
+            _ => Other((&bytes[4..]).to_owned())
+        }
+    }
+}
+
+impl From<Message> for Vec<u8> {
+    fn from(message: Message) -> Self {
+        use self::Message::*;
+        match message {
+            HandshakeInitiation(message) => {
+                let mut bytes = vec![1u8, 0, 0, 0];
+                bytes.append(&mut message.into());
+                bytes
+            },
+            _ => unimplemented!()
+        }
+    }
+}
+
+pub struct HandshakeInitiationMessage {
+    pub sender_i: u32,
+    pub payload: [u8; 76],
+    pub mac1: [u8; 16],
+    pub mac2: [u8; 16]
+}
+
+impl HandshakeInitiationMessage {
+    pub fn new() -> Self {
+        HandshakeInitiationMessage {
+            sender_i: 0,
+            payload: [0u8; 76],
+            mac1: [0u8; 16],
+            mac2: [0u8; 16],
+        }
+    }
+}
+
+impl<'a> From<&'a [u8]> for HandshakeInitiationMessage {
+
+    fn from(bytes: &'a [u8]) -> Self {
+        let mut message = HandshakeInitiationMessage::new();
+        let mut cursor = Cursor::new(bytes);
+
+        message.sender_i = cursor.read_u32::<LittleEndian>().unwrap();
+        cursor.read_exact(&mut message.payload[..]).unwrap();
+        cursor.read_exact(&mut message.mac1[..]).unwrap();
+        cursor.read_exact(&mut message.mac2[..]).unwrap();
+        message
+    }
+}
+
+impl From<HandshakeInitiationMessage> for Vec<u8> {
+    fn from(message: HandshakeInitiationMessage) -> Self {
+        let mut cursor = vec![];
+        cursor.write_all(&[1u8, 0, 0, 0]).unwrap();
+        cursor.write_u32::<LittleEndian>(message.sender_i).unwrap();
+        cursor.write_all(&message.payload).unwrap();
+        cursor.write_all(&message.mac1).unwrap();
+        cursor.write_all(&message.mac2).unwrap();
+
+        cursor
+    }
+}
\ No newline at end of file