capabilities: CAP_CHOWN might be required by many plugins opening UNIX sockets

[strongswan.git] / src / libcharon / plugins / error_notify / error_notify_plugin.c

diff --git a/src/libcharon/plugins/error_notify/error_notify_plugin.c b/src/libcharon/plugins/error_notify/error_notify_plugin.c
index f4f0647..48b3d94 100644 (file)
--- a/src/libcharon/plugins/error_notify/error_notify_plugin.c
+++ b/src/libcharon/plugins/error_notify/error_notify_plugin.c
@@ -49,10 +49,37 @@ METHOD(plugin_t, get_name, char*,
        return "error-notify";
 }
 
+/**
+ * Register listener
+ */
+static bool plugin_cb(private_error_notify_plugin_t *this,
+                                         plugin_feature_t *feature, bool reg, void *cb_data)
+{
+       if (reg)
+       {
+               charon->bus->add_listener(charon->bus, &this->listener->listener);
+       }
+       else
+       {
+               charon->bus->remove_listener(charon->bus, &this->listener->listener);
+       }
+       return TRUE;
+}
+
+METHOD(plugin_t, get_features, int,
+       private_error_notify_plugin_t *this, plugin_feature_t *features[])
+{
+       static plugin_feature_t f[] = {
+               PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
+                       PLUGIN_PROVIDE(CUSTOM, "error-notify"),
+       };
+       *features = f;
+       return countof(f);
+}
+
 METHOD(plugin_t, destroy, void,
        private_error_notify_plugin_t *this)
 {
-       charon->bus->remove_listener(charon->bus, &this->listener->listener);
        this->listener->destroy(this->listener);
        this->socket->destroy(this->socket);
        free(this);
@@ -65,11 +92,17 @@ plugin_t *error_notify_plugin_create()
 {
        private_error_notify_plugin_t *this;
 
+       if (!lib->caps->keep(lib->caps, CAP_CHOWN))
+       {       /* required to chown(2) notify socket */
+               DBG1(DBG_CFG, "error-notify plugin requires CAP_CHOWN capability");
+               return NULL;
+       }
+
        INIT(this,
                .public = {
                        .plugin = {
                                .get_name = _get_name,
-                               .reload = (void*)return_false,
+                               .get_features = _get_features,
                                .destroy = _destroy,
                        },
                },
@@ -77,7 +110,6 @@ plugin_t *error_notify_plugin_create()
        );
 
        this->listener = error_notify_listener_create(this->socket);
-       charon->bus->add_listener(charon->bus, &this->listener->listener);
 
        return &this->public.plugin;
 }