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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, fmt, io};
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)
}
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.last().copied() == Some(b'\n') {
out.pop();
}
model::Key::from_base64(&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 config = String::new();
for (pubkey, conf) in &new.peers {
let old_endpoint;
let old_psk;
if let Some(old_peer) = old.peers.get(pubkey) {
if *old_peer == *conf {
continue;
}
old_endpoint = old_peer.endpoint;
old_psk = old_peer.psk.as_ref();
} else {
old_endpoint = None;
old_psk = None;
}
use fmt::Write;
write!(
config,
"[Peer]\nPublicKey={}\nPersistentKeepalive={}\nAllowedIPs",
pubkey, conf.keepalive
)
.unwrap();
let mut delim = '=';
for ip in &conf.ipv4 {
config.push(delim);
delim = ',';
write!(config, "{}", ip).unwrap();
}
for ip in &conf.ipv6 {
config.push(delim);
delim = ',';
write!(config, "{}", ip).unwrap();
}
config.push('\n');
if old_endpoint != conf.endpoint {
if let Some(ref endpoint) = conf.endpoint {
write!(config, "Endpoint={}\n", endpoint).unwrap();
}
}
if old_psk != conf.psk.as_ref() {
config.push_str("PresharedKey=");
if let Some(psk) = conf.psk.as_ref() {
writeln!(config, "{}", psk).unwrap();
config.push('\n');
} else {
config.push_str("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=\n");
}
}
}
{
let mut config_file = fileutil::Writer::new_in(&self.tmpdir)?;
io::Write::write_all(config_file.file(), config.as_bytes())?;
let config_file = config_file.done();
let mut proc = Self::wg_command();
proc.stdin(Stdio::null());
proc.stdout(Stdio::null());
proc.arg("addconf");
proc.arg(&self.ifname);
proc.arg(config_file.path());
let r = proc.status()?;
if !r.success() {
return Err(io::Error::new(
io::ErrorKind::Other,
"`wg setconf' process failed",
));
}
}
let mut proc = Self::wg_command();
let mut any_removed = false;
proc.stdin(Stdio::null());
proc.stdout(Stdio::null());
proc.arg("set");
proc.arg(&self.ifname);
for pubkey in old.peers.keys() {
if new.peers.contains_key(pubkey) {
continue;
}
any_removed = true;
proc.arg("peer");
proc.arg(pubkey.to_string());
proc.arg("remove");
}
if any_removed {
let r = proc.status()?;
if !r.success() {
return Err(io::Error::new(
io::ErrorKind::Other,
"`wg set' process failed",
));
}
}
Ok(())
}
}
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