Added a thread save, allocating settings get_str variant called alloc_str

src/libstrongswan/settings.c

@@ -444,6 +444,25 @@ METHOD(settings_t, get_str, char*,
 	return def;
 }
 
+METHOD(settings_t, alloc_str, char*,
+	private_settings_t *this, char *key, char *def, ...)
+{
+	char *value;
+	va_list args;
+
+	va_start(args, def);
+	/* additional lock to savely strdup */
+	this->lock->read_lock(this->lock);
+	value = strdupnull(find_value(this, this->top, key, args));
+	this->lock->unlock(this->lock);
+	va_end(args);
+	if (value)
+	{
+		return value;
+	}
+	return def;
+}
+
 /**
  * Described in header
  */
@@ -1192,6 +1211,7 @@ settings_t *settings_create(char *file)
 	INIT(this,
 		.public = {
 			.get_str = _get_str,
+			.alloc_str = _alloc_str,
 			.get_int = _get_int,
 			.get_double = _get_double,
 			.get_time = _get_time,