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#[macro_use]
extern crate arrayref;
use ::std::io;
use ::std::time::{Duration, SystemTime, Instant};
mod bin;
mod ip;
mod proto;
mod config;
mod wg;
struct Source {
config: config::Source,
data: Option<proto::Source>,
next_update: Instant,
backoff: Option<u32>,
}
impl Source {
fn new(config: config::Source) -> Source {
Source {
config,
data: None,
next_update: Instant::now(),
backoff: None,
}
}
}
pub struct Device {
dev: wg::Device,
peer_config: config::PeerConfig,
update_config: config::UpdateConfig,
sources: Vec<Source>,
current: wg::Config,
}
impl Device {
pub fn new(c: config::Config) -> Device {
Device {
dev: wg::Device::new(c.ifname, c.wg_command),
peer_config: c.peers,
update_config: c.update,
sources: c.sources.into_iter().map(Source::new).collect(),
current: wg::Config::new(),
}
}
fn make_config(&self, ts: SystemTime) -> (wg::Config, Vec<wg::ConfigError>, SystemTime) {
let mut cfg = wg::Config::new();
let mut next_update = ts + Duration::from_secs(3600);
let mut errs = vec![];
for src in self.sources.iter() {
if let Some(data) = &src.data {
let sc = data.next.as_ref().and_then(|next| {
if ts >= next.update_at {
Some(&next.config)
} else {
next_update = next_update.min(next.update_at);
None
}
}).unwrap_or(&data.config);
for peer in sc.peers.iter() {
cfg.add_peer(&mut errs, &self.peer_config, &src.config, peer);
}
}
}
(cfg, errs, next_update)
}
pub fn update(&mut self) -> io::Result<Instant> {
let now = Instant::now();
let refresh = self.update_config.refresh_period;
let after_refresh = now + Duration::from_secs(u64::from(refresh));
let mut next_update = after_refresh;
for src in self.sources.iter_mut() {
if now < src.next_update {
next_update = next_update.min(src.next_update);
continue;
}
let r = fetch_source(&src.config.url);
let r = match r {
Ok(r) => {
eprintln!("<6>Updated [{}]", &src.config.url);
src.data = Some(r);
src.backoff = None;
src.next_update = after_refresh;
continue;
}
Err(r) => r,
};
eprintln!("<3>Failed to update [{}]: {}", &src.config.url, &r);
let b = src.backoff.unwrap_or(if src.data.is_some() {
refresh / 3
} else {
u32::min(10, refresh / 10)
});
let b = (b + b / 3).min(refresh);
src.backoff = Some(b);
src.next_update = now + Duration::from_secs(u64::from(b));
next_update = next_update.min(src.next_update);
}
let sysnow = SystemTime::now();
let (config, errors, upd_time) = self.make_config(sysnow);
let time_to_upd = upd_time.duration_since(sysnow).unwrap_or(Duration::from_secs(0));
next_update = next_update.min(now + time_to_upd);
if config != self.current {
eprintln!("<5>Applying configuration update");
for err in errors.iter() {
eprintln!("<{}>{}", if err.important { '4' } else { '5' }, err);
}
self.dev.apply_diff(&self.current, &config)?;
self.current = config;
}
eprintln!("<6>Next configuration update after {:?}", time_to_upd);
Ok(next_update)
}
}
fn fetch_source(url: &str) -> io::Result<proto::Source> {
use ::curl::easy::Easy;
let mut res = Vec::<u8>::new();
{
let mut req = Easy::new();
req.url(url)?;
{
let mut tr = req.transfer();
tr.write_function(|data| {
res.extend_from_slice(data);
Ok(data.len())
})?;
tr.perform()?;
}
let code = req.response_code()?;
if code != 0 && code != 200 {
return Err(io::Error::new(io::ErrorKind::Other, format!("HTTP error {}", code)));
}
}
let mut de = serde_json::Deserializer::from_slice(&res);
let r = serde::Deserialize::deserialize(&mut de)?;
Ok(r)
}
fn load_config(path: &str) -> io::Result<config::Config> {
use std::fs;
use ::serde_json;
let config_file = fs::File::open(path)?;
let rd = io::BufReader::new(config_file);
let mut de = serde_json::Deserializer::from_reader(rd);
Ok(serde::Deserialize::deserialize(&mut de)?)
}
fn main() {
use ::std::{env, thread, process};
let args: Vec<String> = env::args().into_iter().collect();
if args.len() != 2 {
let arg0 = if args.len() >= 1 {
&args[0]
} else {
"wgconf"
};
eprintln!("<1>Usage:");
eprintln!("<1> {} CONFIG", arg0);
process::exit(1);
}
let config = match load_config(&args[1]) {
Ok(c) => c,
Err(e) => {
eprintln!("<1>Failed to load config: {}", e);
process::exit(1);
}
};
let mut dev = Device::new(config);
loop {
let tm = match dev.update() {
Ok(t) => t,
Err(e) => {
eprintln!("<1>{}", e);
process::exit(1);
}
};
let now = Instant::now();
let sleep = tm.duration_since(now);
println!("Sleeping for {:?}", sleep);
thread::sleep(sleep);
}
}
|
