1 files changed, 171 insertions, 0 deletions
diff --git a/src/manager/builder.rs b/src/manager/builder.rs
new file mode 100644
index 0000000..9fc2291
--- /dev/null
+++ b/src/manager/builder.rs
@@ -0,0 +1,171 @@
+// Copyright 2019 Hristo Venev
+//
+// See COPYING.
+
+use crate::{config, model, proto};
+use std::collections::hash_map;
+use std::{error, fmt};
+
+#[derive(Debug)]
+pub struct ConfigError {
+    pub url: String,
+    pub peer: model::Key,
+    pub important: bool,
+    err: &'static str,
+}
+
+impl ConfigError {
+    fn new(err: &'static str, s: &config::Source, p: &proto::Peer, important: bool) -> Self {
+        Self {
+            url: s.url.clone(),
+            peer: p.public_key.clone(),
+            important,
+            err,
+        }
+    }
+}
+
+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
+        )
+    }
+}
+
+pub struct ConfigBuilder<'a> {
+    c: model::Config,
+    err: Vec<ConfigError>,
+    public_key: model::Key,
+    pc: &'a config::PeerConfig,
+}
+
+impl<'a> ConfigBuilder<'a> {
+    #[inline]
+    pub fn new(public_key: model::Key, pc: &'a config::PeerConfig) -> Self {
+        Self {
+            c: model::Config::default(),
+            err: vec![],
+            public_key,
+            pc,
+        }
+    }
+
+    #[inline]
+    pub fn build(self) -> (model::Config, Vec<ConfigError>) {
+        (self.c, self.err)
+    }
+
+    #[inline]
+    pub fn add_server(&mut self, s: &config::Source, p: &proto::Server) {
+        if p.peer.public_key == self.public_key {
+            return;
+        }
+
+        let pc = self.pc;
+        let ent = insert_peer(&mut self.c, &mut self.err, s, &p.peer, |ent| {
+            ent.psk = s.psk.clone();
+            ent.endpoint = Some(p.endpoint.clone());
+            ent.keepalive = pc.fix_keepalive(p.keepalive);
+        });
+
+        add_peer(&mut self.err, ent, s, &p.peer)
+    }
+
+    #[inline]
+    pub fn add_road_warrior(&mut self, s: &config::Source, p: &proto::RoadWarrior) {
+        if p.peer.public_key == self.public_key {
+            self.err.push(ConfigError::new(
+                "The local peer cannot be a road warrior",
+                s,
+                &p.peer,
+                true,
+            ));
+            return;
+        }
+
+        let ent = if p.base == self.public_key {
+            insert_peer(&mut self.c, &mut self.err, s, &p.peer, |_| {})
+        } else if let Some(ent) = self.c.peers.get_mut(&p.base) {
+            ent
+        } else {
+            self.err
+                .push(ConfigError::new("Unknown base peer", s, &p.peer, true));
+            return;
+        };
+        add_peer(&mut self.err, ent, s, &p.peer)
+    }
+}
+
+#[inline]
+fn insert_peer<'b>(
+    c: &'b mut model::Config,
+    err: &mut Vec<ConfigError>,
+    s: &config::Source,
+    p: &proto::Peer,
+    update: impl for<'c> FnOnce(&'c mut model::Peer) -> (),
+) -> &'b mut model::Peer {
+    match c.peers.entry(p.public_key.clone()) {
+        hash_map::Entry::Occupied(ent) => {
+            err.push(ConfigError::new("Duplicate public key", s, p, true));
+            ent.into_mut()
+        }
+        hash_map::Entry::Vacant(ent) => {
+            let ent = ent.insert(model::Peer {
+                endpoint: None,
+                psk: None,
+                keepalive: 0,
+                ipv4: vec![],
+                ipv6: vec![],
+            });
+            update(ent);
+            ent
+        }
+    }
+}
+
+fn add_peer(
+    err: &mut Vec<ConfigError>,
+    ent: &mut model::Peer,
+    s: &config::Source,
+    p: &proto::Peer,
+) {
+    let mut added = false;
+    let mut removed = false;
+
+    for i in &p.ipv4 {
+        if s.ipv4.contains(i) {
+            ent.ipv4.push(*i);
+            added = true;
+        } else {
+            removed = true;
+        }
+    }
+    for i in &p.ipv6 {
+        if s.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(ConfigError::new(msg, s, p, !added));
+    }
+}