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//! Overlay network configuration
#[cfg(feature = "nat")]
use crate::nat::NatConfig;
use serde::{Deserialize, Serialize};
use std::net::{IpAddr, Ipv4Addr, SocketAddr};
use std::path::PathBuf;
use std::time::Duration;
/// Overlay network configuration
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct OverlayConfig {
/// Local overlay endpoint (`WireGuard` protocol)
pub local_endpoint: SocketAddr,
/// Private key (x25519)
pub private_key: String,
/// Public key (derived from private key)
#[serde(default = "OverlayConfig::default_public_key")]
pub public_key: String,
/// Overlay network CIDR (supports both IPv4 e.g. "10.0.0.0/8" and IPv6 e.g. "`fd00::/48`")
///
/// Historically stores the per-node slice / host IP (e.g. `10.200.0.0/28`
/// or `10.200.0.1/32`) that the local TUN/Wintun adapter is assigned.
/// It is *not* the full cluster CIDR — use [`Self::cluster_cidr`] for that.
#[serde(default = "OverlayConfig::default_cidr")]
pub overlay_cidr: String,
/// Full cluster CIDR (e.g. `10.200.0.0/16`).
///
/// Used on Windows to install a catch-all host route pointing the
/// entire cluster range at the Wintun adapter so traffic to remote-node
/// container IPs flows through the overlay (HCN auto-installs the more
/// specific local /28 → vSwitch route, and longest-prefix-match routes
/// local traffic to the vSwitch). `None` on pre-cluster-CIDR configs;
/// callers should fall back to skipping the route install in that case.
#[serde(default)]
pub cluster_cidr: Option<String>,
/// Peer discovery interval
#[serde(default = "OverlayConfig::default_discovery")]
pub peer_discovery_interval: Duration,
/// NAT traversal configuration (requires "nat" feature)
#[cfg(feature = "nat")]
#[serde(default)]
pub nat: NatConfig,
/// Directory containing per-interface `WireGuard` UAPI sockets
/// (`<dir>/<interface_name>.sock`). Defaults to `/var/run/wireguard`
/// on Linux for `wg(8)` interop; overridden to `{data_dir}/run/wireguard`
/// by the daemon when running with a non-default `--data-dir` to keep
/// a test/dev daemon hermetic.
#[serde(default = "OverlayConfig::default_uapi_sock_dir")]
pub uapi_sock_dir: PathBuf,
}
impl OverlayConfig {
fn default_public_key() -> String {
String::new()
}
fn default_cidr() -> String {
"10.0.0.0/8".to_string()
}
fn default_discovery() -> Duration {
Duration::from_secs(30)
}
/// Platform-default `WireGuard` UAPI socket directory.
///
/// Linux: `/var/run/wireguard` (FHS, matches `wg(8)`).
/// macOS / Windows: `/var/run/wireguard` is the historical literal
/// the transport used; the daemon overrides this to a data-dir-aware
/// path via [`zlayer_paths::ZLayerDirs::wireguard`] when a non-default
/// `--data-dir` is in play.
fn default_uapi_sock_dir() -> PathBuf {
PathBuf::from("/var/run/wireguard")
}
}
impl Default for OverlayConfig {
fn default() -> Self {
Self {
local_endpoint: SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 51820),
private_key: String::new(),
public_key: String::new(),
overlay_cidr: "10.0.0.0/8".to_string(),
cluster_cidr: None,
peer_discovery_interval: Duration::from_secs(30),
#[cfg(feature = "nat")]
nat: NatConfig::default(),
uapi_sock_dir: Self::default_uapi_sock_dir(),
}
}
}
/// Peer information
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct PeerInfo {
/// Peer public key
pub public_key: String,
/// Endpoint address
pub endpoint: SocketAddr,
/// Allowed IPs
pub allowed_ips: String,
/// Persistent keepalive interval
pub persistent_keepalive_interval: Duration,
}
impl PeerInfo {
/// Create a new peer info
#[must_use]
pub fn new(
public_key: String,
endpoint: SocketAddr,
allowed_ips: &str,
persistent_keepalive_interval: Duration,
) -> Self {
Self {
public_key,
endpoint,
allowed_ips: allowed_ips.to_string(),
persistent_keepalive_interval,
}
}
/// Create a peer config block (`WireGuard` protocol format)
#[must_use]
pub fn to_peer_config(&self) -> String {
format!(
"[Peer]\n\
PublicKey = {}\n\
Endpoint = {}\n\
AllowedIPs = {}\n\
PersistentKeepalive = {}\n",
self.public_key,
self.endpoint,
self.allowed_ips,
self.persistent_keepalive_interval.as_secs()
)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_peer_info_to_peer_config() {
let peer = PeerInfo::new(
"public_key_here".to_string(),
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(192, 168, 1, 1)), 51820),
"10.0.0.2/32",
Duration::from_secs(25),
);
let config = peer.to_peer_config();
assert!(config.contains("PublicKey = public_key_here"));
assert!(config.contains("Endpoint = 192.168.1.1:51820"));
}
#[test]
fn test_overlay_config_default() {
let config = OverlayConfig::default();
assert_eq!(config.local_endpoint.port(), 51820);
assert_eq!(config.overlay_cidr, "10.0.0.0/8");
}
#[test]
fn test_peer_info_to_peer_config_v6() {
use std::net::Ipv6Addr;
let peer = PeerInfo::new(
"public_key_here".to_string(),
SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), 51820),
"fd00::2/128",
Duration::from_secs(25),
);
let config = peer.to_peer_config();
assert!(config.contains("PublicKey = public_key_here"));
assert!(config.contains("Endpoint = [::1]:51820"));
assert!(config.contains("AllowedIPs = fd00::2/128"));
}
#[test]
fn test_overlay_config_accepts_ipv6_cidr() {
let config = OverlayConfig {
overlay_cidr: "fd00:200::/48".to_string(),
..OverlayConfig::default()
};
assert_eq!(config.overlay_cidr, "fd00:200::/48");
}
}