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// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Copyright 2019 Hristo Venev
use crate::{fileutil, model};
use std::ffi::{OsStr, OsString};
use std::path::PathBuf;
use std::process::{Command, Stdio};
use std::{env, io, mem};
pub struct Device {
ifname: OsString,
tmpdir: PathBuf,
}
impl Device {
#[inline]
pub fn open(ifname: OsString, tmpdir: PathBuf) -> io::Result<Self> {
let dev = Self { ifname, tmpdir };
let _ = dev.get_public_key()?;
Ok(dev)
}
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 = Self::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 = Self::wg_command();
proc.arg("set");
proc.arg(&self.ifname);
let mut tmps = vec![];
for (pubkey, conf) in &new.peers {
let old_endpoint;
if let Some(old_peer) = old.peers.get(pubkey) {
if *old_peer == *conf {
continue;
}
old_endpoint = old_peer.endpoint;
} else {
old_endpoint = None;
}
proc.arg("peer");
proc.arg(pubkey.to_string());
proc.arg("persistent-keepalive");
proc.arg(conf.keepalive.to_string());
if old_endpoint != conf.endpoint {
if let Some(ref endpoint) = conf.endpoint {
proc.arg("endpoint");
proc.arg(endpoint.to_string());
}
}
if let Some(psk) = &conf.psk {
proc.arg("preshared-key");
let mut tmp = self.tmpdir.clone();
tmp.push(format!("tmp-{}", tmps.len()));
let mut tmp = fileutil::Writer::new(tmp)?;
{
use io::Write;
writeln!(tmp.file(), "{}", psk)?;
}
let tmp = tmp.done();
proc.arg(tmp.path());
tmps.push(tmp);
}
let mut ips = String::new();
{
use std::fmt::Write;
for ip in &conf.ipv4 {
if !ips.is_empty() {
ips.push(',');
}
write!(ips, "{}", ip).unwrap();
}
for ip in &conf.ipv6 {
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(pubkey.to_string());
proc.arg("remove");
}
let r = proc.status()?;
mem::drop(tmps);
if !r.success() {
return Err(io::Error::new(io::ErrorKind::Other, "child process failed"));
}
Ok(())
}
}
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