1 files changed, 129 insertions, 0 deletions
diff --git a/nix/wgautomesh.nix b/nix/wgautomesh.nix
new file mode 100644
index 0000000..c64c4af
--- /dev/null
+++ b/nix/wgautomesh.nix
@@ -0,0 +1,129 @@
+let
+  wgautomesh = builtins.fetchTarball {
+    url = "https://git.deuxfleurs.fr/attachments/ce203833-1ae7-43d4-9bf4-b49b560c9f4b";
+    sha256 = "sha256:1kc990s7xkwff53vs6c3slg7ljsyr9xz1i13j61ivfj6djyh8rmj";
+  };
+in
+
+{ lib, config, pkgs, ... }:
+with lib;
+let 
+  cfg = config.services.wgautomesh;
+in
+  with builtins;
+  {
+    options.services.wgautomesh = {
+      enable = mkEnableOption "wgautomesh";
+      logLevel = mkOption {
+        type = types.enum [ "trace" "debug" "info" "warn" "error" ];
+        default = "info";
+        description = "wgautomesh log level (trace/debug/info/warn/error)";
+      };
+      interface = mkOption {
+        type = types.str;
+        description = "Wireguard interface to manage";
+      };
+      gossipPort = mkOption {
+        type = types.port;
+        description = "wgautomesh gossip port";
+      };
+      gossipSecretFile = mkOption {
+        type = types.nullOr types.str;
+        description = "File containing the gossip secret encryption key";
+      };
+      persistFile = mkOption {
+        type = types.nullOr types.str;
+        description = "Path where to persist known peer addresses";
+      };
+      lanDiscovery = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable discovery using LAN broadcast";
+      };
+      openFirewall = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Automatically open gossip port in firewall";
+      };
+      upnpForwardPublicPort = mkOption {
+        type = types.nullOr types.port;
+        default = null;
+        description = "Public port number to try to redirect to this machine using UPnP IGD";
+      };
+      peers = mkOption {
+        type = types.listOf (types.submodule {
+          options = {
+            pubkey = mkOption {
+              type = types.str;
+              description = "Wireguard public key";
+            };
+            address = mkOption {
+              type = types.str;
+              description = "Wireguard peer address";
+            };
+            endpoint = mkOption {
+              type = types.nullOr types.str;
+              description = "bootstrap endpoint";
+            };
+          };
+        });
+        description = "wgautomesh peer list";
+      };
+    };
+
+    config = mkIf cfg.enable ( 
+    let
+      peerDefs = map (peer:
+        let endpointDef = if peer.endpoint == null then ""
+        else ''endpoint = "${peer.endpoint}"'';
+        in
+        ''
+          [[peers]]
+          pubkey = "${peer.pubkey}"
+          address = "${peer.address}"
+          ${endpointDef}
+        '') cfg.peers;
+      extraDefs = (if cfg.lanDiscovery then ["lan_discovery = true"] else [])
+        ++ (if (cfg.gossipSecretFile != null)
+          then [''gossip_secret_file = "${cfg.gossipSecretFile}"''] else [])
+        ++ (if (cfg.persistFile != null)
+          then [''persist_file = "${cfg.persistFile}"''] else [])
+        ++ (if (cfg.upnpForwardPublicPort != null)
+          then [''upnp_forward_external_port = ${toString cfg.upnpForwardPublicPort}''] else []);
+      configfile = pkgs.writeText "wgautomesh.toml" ''
+        interface = "${cfg.interface}"
+        gossip_port = ${toString cfg.gossipPort}
+        ${concatStringsSep "\n" extraDefs}
+
+        ${concatStringsSep "\n" peerDefs}
+        '';
+    in {
+      systemd.services.wgautomesh = {
+        enable = true;
+        path = [ pkgs.wireguard-tools ];
+        environment = {
+          RUST_LOG = "wgautomesh=${cfg.logLevel}";
+        };
+        description = "wgautomesh";
+        serviceConfig = {
+          Type = "simple";
+
+          ExecStart = "${wgautomesh}/bin/wgautomesh ${configfile}";
+          Restart = "always";
+          RestartSec = "30";
+
+          ExecStartPre = [ "+${pkgs.coreutils}/bin/chown wgautomesh /var/lib/wgautomesh/gossip_secret" ];
+
+          DynamicUser = true;
+          User = "wgautomesh";
+          StateDirectory = "wgautomesh";
+          StateDirectoryMode = "0700";
+          AmbientCapabilities = "CAP_NET_ADMIN CAP_NET_BIND_SERVICE";
+          CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_BIND_SERVICE";
+        };
+        wantedBy = [ "multi-user.target" ];
+      };
+      networking.firewall.allowedUDPPorts = mkIf cfg.openFirewall [ cfg.gossipPort ];
+    });
+  }
+