libstrongswan can be initialized more than once

src/libstrongswan/library.c

@@ -44,12 +44,22 @@ struct private_library_t {
 	 * Hashtable with registered objects (name => object)
 	 */
 	hashtable_t *objects;
+
+	/**
+	 * Integrity check failed?
+	 */
+	bool integrity_failed;
+
+	/**
+	 * Number of times we have been initialized
+	 */
+	refcount_t ref;
 };
 
 /**
  * library instance
  */
-library_t *lib;
+library_t *lib = NULL;
 
 /**
  * Deinitialize library
@@ -59,6 +69,11 @@ void library_deinit()
 	private_library_t *this = (private_library_t*)lib;
 	bool detailed;
 
+	if (!this || !ref_put(&this->ref))
+	{	/* have more users */
+		return;
+	}
+
 	detailed = lib->settings->get_bool(lib->settings,
 								"libstrongswan.leak_detective.detailed", TRUE);
 
@@ -142,11 +157,19 @@ bool library_init(char *settings)
 	private_library_t *this;
 	printf_hook_t *pfh;
 
+	if (lib)
+	{	/* already initialized, increase refcount */
+		this = (private_library_t*)lib;
+		ref_get(&this->ref);
+		return !this->integrity_failed;
+	}
+
 	INIT(this,
 		.public = {
 			.get = _get,
 			.set = _set,
 		},
+		.ref = 1,
 	);
 	lib = &this->public;
 
@@ -204,14 +227,14 @@ bool library_init(char *settings)
 		if (!lib->integrity->check(lib->integrity, "libstrongswan", library_init))
 		{
 			DBG1(DBG_LIB, "integrity check of libstrongswan failed");
-			return FALSE;
+			this->integrity_failed = TRUE;
 		}
 #else /* !INTEGRITY_TEST */
 		DBG1(DBG_LIB, "integrity test enabled, but not supported");
-		return FALSE;
+		this->integrity_failed = TRUE;
 #endif /* INTEGRITY_TEST */
 	}
 
-	return TRUE;
+	return !this->integrity_failed;
 }
 

src/libstrongswan/library.h

@@ -202,6 +202,9 @@ struct library_t {
 /**
  * Initialize library, creates "lib" instance.
  *
+ * library_init() may be called multiple times in a single process, but each
+ * caller should call library_deinit() for each call to library_init().
+ *
  * @param settings		file to read settings from, may be NULL for default
  * @return				FALSE if integrity check failed
  */