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use crate::ip::{Endpoint, Ipv4Net, Ipv6Net};
use crate::{config, proto};
use hash_map::HashMap;
use std::collections::hash_map;
use std::{error, fmt, io};
#[derive(Clone, PartialEq, Eq, Debug)]
struct Peer {
endpoint: Endpoint,
psk: Option<String>,
keepalive: u32,
ipv4: Vec<Ipv4Net>,
ipv6: Vec<Ipv6Net>,
}
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct Config {
peers: HashMap<String, Peer>,
}
#[derive(Debug)]
pub struct ConfigError {
pub url: String,
pub peer: String,
pub important: bool,
err: &'static str,
}
impl error::Error for ConfigError {}
impl fmt::Display for ConfigError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{} [{}] from [{}]: {}",
if self.important {
"Invalid peer"
} else {
"Misconfigured peer"
},
self.peer, self.url, self.err
)
}
}
impl Config {
pub fn new() -> Config {
Config {
peers: HashMap::new(),
}
}
pub fn add_peer(
&mut self,
errors: &mut Vec<ConfigError>,
c: &config::PeerConfig,
s: &config::Source,
p: &proto::Peer,
) {
if !valid_key(&p.public_key) {
errors.push(ConfigError {
url: s.url.clone(),
peer: p.public_key.clone(),
important: true,
err: "Invalid public key",
});
return;
}
if let Some(ref psk) = s.psk {
if !valid_key(psk) {
errors.push(ConfigError {
url: s.url.clone(),
peer: p.public_key.clone(),
important: true,
err: "Invalid preshared key",
});
return;
}
}
if c.omit_peers.contains(&p.public_key) {
return;
}
let ent = match self.peers.entry(p.public_key.clone()) {
hash_map::Entry::Occupied(ent) => {
errors.push(ConfigError {
url: s.url.clone(),
peer: p.public_key.clone(),
important: true,
err: "Duplicate public key",
});
ent.into_mut()
}
hash_map::Entry::Vacant(ent) => {
let mut keepalive = p.keepalive;
if c.max_keepalive != 0 && (keepalive == 0 || keepalive > c.max_keepalive) {
keepalive = c.max_keepalive;
}
if keepalive != 0 && keepalive < c.min_keepalive {
keepalive = c.min_keepalive;
}
ent.insert(Peer {
endpoint: p.endpoint.clone(),
psk: s.psk.clone(),
keepalive,
ipv4: vec![],
ipv6: vec![],
})
},
};
let mut added = false;
let mut removed = false;
for i in p.ipv4.iter() {
if s.ipv4.contains(i) {
ent.ipv4.push(*i);
added = true;
} else {
removed = true;
}
}
for i in p.ipv6.iter() {
if s.ipv6.contains(i) {
ent.ipv6.push(*i);
added = true;
} else {
removed = true;
}
}
if removed {
errors.push(ConfigError {
url: s.url.clone(),
peer: p.public_key.clone(),
important: !added,
err: if added {
"Some IPs removed"
} else {
"All IPs removed"
},
});
}
}
}
impl Default for Config {
#[inline]
fn default() -> Self {
Config::new()
}
}
pub struct Device {
ifname: String,
wg_command: String,
}
impl Device {
pub fn new(ifname: String, wg_command: String) -> Self {
Device { ifname, wg_command }
}
pub fn apply_diff(&mut self, old: &Config, new: &Config) -> io::Result<()> {
use std::process::{Command, Stdio};
let mut proc = Command::new(&self.wg_command);
proc.stdin(Stdio::piped());
proc.arg("set");
proc.arg(&self.ifname);
let mut psks = Vec::<&str>::new();
for (pubkey, conf) in new.peers.iter() {
if let Some(old_peer) = old.peers.get(pubkey) {
if *old_peer == *conf {
continue;
}
}
proc.arg("peer");
proc.arg(pubkey);
// TODO: maybe skip endpoint?
proc.arg("endpoint");
proc.arg(format!("{}", conf.endpoint));
if let Some(psk) = &conf.psk {
proc.arg("preshared-key");
proc.arg("/dev/stdin");
psks.push(psk);
}
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(pubkey);
proc.arg("remove");
}
let mut proc = proc.spawn()?;
{
use std::io::Write;
let stdin = proc.stdin.as_mut().unwrap();
for psk in psks {
writeln!(stdin, "{}", psk)?;
}
}
let r = proc.wait()?;
if !r.success() {
return Err(io::Error::new(io::ErrorKind::Other, "Child process failed"));
}
Ok(())
}
}
fn valid_key(s: &str) -> bool {
let s = s.as_bytes();
if s.len() != 44 {
return false;
}
if s[43] != b'=' {
return false;
}
for c in s[0..42].iter().cloned() {
if c >= b'0' && c <= b'9' {
continue;
}
if c >= b'A' && c <= b'Z' {
continue;
}
if c >= b'a' && c <= b'z' {
continue;
}
if c == b'+' || c <= b'/' {
continue;
}
return false;
}
b"048AEIMQUYcgkosw".contains(&s[42])
}
|
