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// Copyright 2019 Hristo Venev
//
// See COPYING.
use super::Source;
use crate::{config, model, proto};
use std::collections::hash_map;
use std::{error, fmt};
#[derive(Debug)]
pub struct Error {
pub src: String,
pub peer: model::Key,
important: bool,
err: &'static str,
}
impl Error {
fn new(err: &'static str, src: &Source, p: &proto::Peer, important: bool) -> Self {
Self {
src: src.name.clone(),
peer: p.public_key,
important,
err,
}
}
#[inline]
pub fn important(&self) -> bool {
self.important
}
}
impl error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{} [{}]/[{}]: {}",
if self.important {
"Invalid peer"
} else {
"Misconfigured peer"
},
self.src,
self.peer,
self.err
)
}
}
pub(super) struct ConfigBuilder<'a> {
c: model::Config,
err: Vec<Error>,
public_key: model::Key,
gc: &'a config::GlobalConfig,
}
impl<'a> ConfigBuilder<'a> {
#[inline]
pub fn new(public_key: model::Key, gc: &'a config::GlobalConfig) -> Self {
Self {
c: model::Config::empty(),
err: vec![],
public_key,
gc,
}
}
#[inline]
pub fn build(self) -> (model::Config, Vec<Error>) {
(self.c, self.err)
}
#[inline]
pub fn add_server(&mut self, src: &Source, p: &proto::Server) {
let gc = self.gc;
let psk = match find_psk(gc, src, &p.peer) {
Ok(v) => v,
Err(e) => {
self.err.push(e);
return;
}
};
if p.peer.public_key == self.public_key {
return;
}
let ent = insert_peer(&mut self.c, &mut self.err, src, &p.peer, psk, |ent| {
ent.endpoint = Some(p.endpoint);
ent.keepalive = gc.fix_keepalive(p.keepalive);
});
add_peer(&mut self.err, ent, src, &p.peer)
}
#[inline]
pub fn add_road_warrior(&mut self, src: &Source, p: &proto::RoadWarrior) {
let psk = match find_psk(&self.gc, src, &p.peer) {
Ok(v) => v,
Err(e) => {
self.err.push(e);
return;
}
};
if p.peer.public_key == self.public_key {
self.err.push(Error::new(
"The local peer cannot be a road warrior",
src,
&p.peer,
true,
));
return;
}
let ent = if p.base == self.public_key {
insert_peer(&mut self.c, &mut self.err, src, &p.peer, psk, |_| {})
} else if let Some(ent) = self.c.peers.get_mut(&p.base) {
ent
} else {
self.err
.push(Error::new("Unknown base peer", src, &p.peer, true));
return;
};
add_peer(&mut self.err, ent, src, &p.peer)
}
}
#[inline]
fn insert_peer<'b>(
c: &'b mut model::Config,
err: &mut Vec<Error>,
src: &Source,
p: &proto::Peer,
psk: Option<&model::Key>,
update: impl for<'c> FnOnce(&'c mut model::Peer) -> (),
) -> &'b mut model::Peer {
match c.peers.entry(p.public_key) {
hash_map::Entry::Occupied(ent) => {
err.push(Error::new("Duplicate public key", src, p, true));
ent.into_mut()
}
hash_map::Entry::Vacant(ent) => {
let ent = ent.insert(model::Peer {
endpoint: None,
psk: psk.cloned(),
keepalive: 0,
ipv4: vec![],
ipv6: vec![],
});
update(ent);
ent
}
}
}
fn find_psk<'a>(
gc: &'a config::GlobalConfig,
src: &'a Source,
p: &proto::Peer,
) -> Result<Option<&'a model::Key>, Error> {
let want = gc.peers.get(&p.public_key);
let want = if let Some(v) = want {
v
} else {
return Ok(None);
};
if let Some(ref want_src) = &want.source {
if *want_src != src.name {
return Err(Error::new("Peer source not allowed", src, p, true));
}
}
Ok(want.psk.as_ref().or_else(|| src.config.psk.as_ref()))
}
fn add_peer(err: &mut Vec<Error>, ent: &mut model::Peer, src: &Source, p: &proto::Peer) {
let mut added = false;
let mut removed = false;
for i in &p.ipv4 {
if src.config.ipv4.contains(i) {
ent.ipv4.push(*i);
added = true;
} else {
removed = true;
}
}
for i in &p.ipv6 {
if src.config.ipv6.contains(i) {
ent.ipv6.push(*i);
added = true;
} else {
removed = true;
}
}
if removed {
let msg = if added {
"Some IPs removed"
} else {
"All IPs removed"
};
err.push(Error::new(msg, src, p, !added));
}
}
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