Added support for plugin features

src/libstrongswan/plugins/plugin.h

@@ -21,11 +21,11 @@
 #ifndef PLUGIN_H_
 #define PLUGIN_H_
 
-#include "../utils.h"
-#include <library.h>
-
 typedef struct plugin_t plugin_t;
 
+#include <library.h>
+#include <plugins/plugin_feature.h>
+
 /**
  * Interface definition of a plugin.
  */
@@ -38,6 +38,17 @@ struct plugin_t {
 	 */
 	char* (*get_name)(plugin_t *this);
 
+	/**
+	 * Get plugin features with dependencies.
+	 *
+	 * The returned array contains features provided by the plugin and
+	 * dependencies for that feature. See plugin_feature_t for details.
+	 *
+	 * @param features	pointer receiving plugin features
+	 * @return			number of features
+	 */
+	int (*get_features)(plugin_t *this, plugin_feature_t *features[]);
+
 	/**
 	 * Try to reload plugin configuration.
 	 *