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//! 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 failure::{Error, err_msg};
use std::fs::{create_dir, remove_file};
use std::mem;
use std::iter::Iterator;
use std::path::{Path, PathBuf};
use std::str;
use types::PeerInfo;
use hex::FromHex;
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)>) -> Result<Vec<UpdateEvent>, Error> {
let mut events = vec![];
let mut pending_peer = false;
let mut remove_pending_peer = false;
let mut info = PeerInfo::default();
for (key, value) in items {
match key.as_ref() {
"private_key" => { events.push(UpdateEvent::PrivateKey(<[u8; 32]>::from_hex(&value)?)); },
"listen_port" => { events.push(UpdateEvent::ListenPort(value.parse()?)); },
"public_key" => {
let peer_info = mem::replace(&mut info, PeerInfo::default());
match (pending_peer, remove_pending_peer) {
(true, true) => events.push(UpdateEvent::RemovePeer(peer_info.pub_key)),
(true, false) => events.push(UpdateEvent::UpdatePeer(peer_info)),
_ => {}
}
info.pub_key = <[u8; 32]>::from_hex(&value)?;
pending_peer = true;
remove_pending_peer = false;
},
"preshared_key" => { info.psk = Some(<[u8; 32]>::from_hex(&value)?); },
"persistent_keepalive_interval" => { info.keep_alive_interval = Some(value.parse()?); },
"endpoint" => { info.endpoint = Some(value.parse()?); },
"remove" => { remove_pending_peer = true; }
"allowed_ip" => {
let (ip, cidr) = value.split_at(value.find('/').ok_or_else(|| err_msg("ip/cidr format error"))?);
info.allowed_ips.push((ip.parse()?, (&cidr[1..]).parse()?))
},
_ => { warn!("unrecognized configuration pair: {}={}", key, value)}
}
}
// "flush" the final peer if there is one
match (pending_peer, remove_pending_peer) {
(true, true) => events.push(UpdateEvent::RemovePeer(info.pub_key)),
(true, false) => events.push(UpdateEvent::UpdatePeer(info)),
_ => {}
}
trace!("events {:?}", events);
Ok(events)
}
}
pub struct ConfigurationCodec;
impl Decoder for ConfigurationCodec {
type Item = Command;
type Error = Error;
fn decode(&mut self, buf: &mut BytesMut) -> 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 = match cmd.as_str() {
"get" => Command::Get(version.parse()?),
"set" => Command::Set(version.parse()?, UpdateEvent::from(items)?),
_ => bail!("invalid command")
};
Ok(Some(command))
}
}
impl Encoder for ConfigurationCodec {
type Item = String;
type Error = Error;
fn encode(&mut self, msg: Self::Item, buf: &mut BytesMut) -> Result<(), Self::Error> {
buf.extend(msg.as_bytes());
buf.extend(b"\n\n");
Ok(())
}
}
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(&self) -> Result<PathBuf, Error> {
// 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(&self.interface_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<(), Error> {
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<(), Error> {
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() {
info!("Removing socket on drop: {}", socket_path.display());
let _ = remove_file(&socket_path);
}
}
}
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