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// Copyright 2019 Hristo Venev
//
// See COPYING.
use crate::model;
use std::ffi::{OsStr, OsString};
use std::process::{Command, Stdio};
use std::{env, io};
pub struct Device {
ifname: String,
}
impl Device {
#[inline]
pub fn new(ifname: String) -> io::Result<Self> {
Ok(Device { ifname })
}
pub fn wg_command() -> Command {
let wg = match env::var_os("WG") {
None => OsString::new(),
Some(v) => v,
};
Command::new(if wg.is_empty() {
OsStr::new("wg")
} else {
wg.as_os_str()
})
}
pub fn get_public_key(&self) -> io::Result<model::Key> {
let mut proc = Device::wg_command();
proc.stdin(Stdio::null());
proc.stdout(Stdio::piped());
proc.arg("show");
proc.arg(&self.ifname);
proc.arg("public-key");
let r = proc.output()?;
if !r.status.success() {
return Err(io::Error::new(io::ErrorKind::Other, "Child process failed"));
}
let mut out = r.stdout;
if out.ends_with(b"\n") {
out.remove(out.len() - 1);
}
model::Key::from_bytes(&out)
.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid public key"))
}
pub fn apply_diff(&mut self, old: &model::Config, new: &model::Config) -> io::Result<()> {
let mut proc = Device::wg_command();
proc.stdin(Stdio::piped());
proc.arg("set");
proc.arg(&self.ifname);
let mut psks = String::new();
for (pubkey, conf) in new.peers.iter() {
let old_endpoint;
if let Some(old_peer) = old.peers.get(pubkey) {
if *old_peer == *conf {
continue;
}
old_endpoint = old_peer.endpoint.clone();
} else {
old_endpoint = None;
}
proc.arg("peer");
proc.arg(format!("{}", pubkey));
if old_endpoint != conf.endpoint {
if let Some(ref endpoint) = conf.endpoint {
proc.arg("endpoint");
proc.arg(format!("{}", endpoint));
}
}
if let Some(psk) = &conf.psk {
proc.arg("preshared-key");
proc.arg("/dev/stdin");
{
use std::fmt::Write;
writeln!(&mut psks, "{}", psk).unwrap();
}
}
let mut ips = String::new();
{
use std::fmt::Write;
for ip in conf.ipv4.iter() {
if !ips.is_empty() {
ips.push(',');
}
write!(ips, "{}", ip).unwrap();
}
for ip in conf.ipv6.iter() {
if !ips.is_empty() {
ips.push(',');
}
write!(ips, "{}", ip).unwrap();
}
}
proc.arg("allowed-ips");
proc.arg(ips);
}
for pubkey in old.peers.keys() {
if new.peers.contains_key(pubkey) {
continue;
}
proc.arg("peer");
proc.arg(format!("{}", pubkey));
proc.arg("remove");
}
let mut proc = proc.spawn()?;
{
use std::io::Write;
let stdin = proc.stdin.as_mut().unwrap();
write!(stdin, "{}", psks)?;
}
let r = proc.wait()?;
if !r.success() {
return Err(io::Error::new(io::ErrorKind::Other, "Child process failed"));
}
Ok(())
}
}
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