nm plugin handles DNS/NBNS configuration attributes

src/charon/plugins/nm/nm_handler.c

@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+#include "nm_handler.h"
+
+#include <daemon.h>
+
+typedef struct private_nm_handler_t private_nm_handler_t;
+
+/**
+ * Private data of an nm_handler_t object.
+ */
+struct private_nm_handler_t {
+	
+	/**
+	 * Public nm_handler_t interface.
+	 */
+	nm_handler_t public;
+	
+	/**
+	 * list of received DNS server attributes, pointer to 4 byte data
+	 */
+	linked_list_t *dns;
+	
+	/**
+	 * list of received NBNS server attributes, pointer to 4 byte data
+	 */
+	linked_list_t *nbns;
+};
+
+/**
+ * Implementation of attribute_handler_t.handle
+ */
+static bool handle(private_nm_handler_t *this, ike_sa_t *ike_sa,
+				   configuration_attribute_type_t type, chunk_t data)
+{
+	linked_list_t *list;
+	
+	switch (type)
+	{
+		case INTERNAL_IP4_DNS:
+			list = this->dns;
+			break;
+		case INTERNAL_IP4_NBNS:
+			list = this->nbns;
+			break;
+		default:
+			return FALSE;
+	}
+	if (data.len != 4)
+	{
+		return FALSE;
+	}
+	list->insert_last(list, chunk_clone(data).ptr);
+	return TRUE;
+}
+
+/**
+ * convert plain byte ptrs to handy chunk during enumeration
+ */
+static bool filter_chunks(void* null, char **in, chunk_t *out)
+{
+	*out = chunk_create(*in, 4);
+	return TRUE;
+}
+
+/**
+ * Implementation of nm_handler_t.create_enumerator
+ */
+static enumerator_t* create_enumerator(private_nm_handler_t *this,
+									   configuration_attribute_type_t type)
+{
+	linked_list_t *list;
+	
+	switch (type)
+	{
+		case INTERNAL_IP4_DNS:
+			list = this->dns;
+			break;
+		case INTERNAL_IP4_NBNS:
+			list = this->nbns;
+		default:
+			return enumerator_create_empty();
+	}
+	return enumerator_create_filter(list->create_enumerator(list),
+						(void*)filter_chunks, NULL, NULL);
+}
+
+/**
+ * Implementation of nm_handler_t.reset
+ */
+static void reset(private_nm_handler_t *this)
+{
+	void *data;
+	
+	while (this->dns->remove_last(this->dns, (void**)&data) == SUCCESS)
+	{
+		free(data);
+	}
+	while (this->nbns->remove_last(this->nbns, (void**)&data) == SUCCESS)
+	{
+		free(data);
+	}
+}
+
+/**
+ * Implementation of nm_handler_t.destroy.
+ */
+static void destroy(private_nm_handler_t *this)
+{
+	reset(this);
+	this->dns->destroy(this->dns);
+	this->nbns->destroy(this->nbns);
+	free(this);
+}
+
+/**
+ * See header
+ */
+nm_handler_t *nm_handler_create()
+{
+	private_nm_handler_t *this = malloc_thing(private_nm_handler_t);
+	
+	this->public.handler.handle = (bool(*)(attribute_handler_t*, ike_sa_t*, configuration_attribute_type_t, chunk_t))handle;
+	this->public.handler.release = (void(*)(attribute_handler_t*, ike_sa_t*, configuration_attribute_type_t, chunk_t))nop;
+	this->public.create_enumerator = (enumerator_t*(*)(nm_handler_t*, configuration_attribute_type_t type))create_enumerator;
+	this->public.reset = (void(*)(nm_handler_t*))reset;
+	this->public.destroy = (void(*)(nm_handler_t*))destroy;
+	
+	this->dns = linked_list_create();
+	this->nbns = linked_list_create();
+	
+	return &this->public;
+}
+