- defined all substructures for a SA payload
This commit is contained in:
Jan Hutter
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/**
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* @file transform_substructure.h
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*
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* @brief Declaration of the class transform_substructure_t.
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*
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* An object of this type represents an IKEv2 TRANSFORM Substructure and contains Attributes.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* offsetof macro */
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#include <stddef.h>
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#include "transform_substructure.h"
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#include "transform_attribute.h"
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#include "encodings.h"
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#include "../types.h"
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#include "../utils/allocator.h"
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#include "../utils/linked_list.h"
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/**
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* Private data of an transform_substructure_t' Object
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*
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*/
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typedef struct private_transform_substructure_s private_transform_substructure_t;
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struct private_transform_substructure_s {
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/**
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* public transform_substructure_t interface
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*/
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transform_substructure_t public;
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/**
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* next payload type
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*/
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u_int8_t next_payload;
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/**
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* Length of this payload
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*/
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u_int16_t transform_length;
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/**
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* Type of the transform
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*/
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u_int8_t transform_type;
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/**
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* Transform ID
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*/
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u_int8_t transform_id;
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/**
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* Transforms Attributes are stored in a linked_list_t
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*/
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linked_list_t * attributes;
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};
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/**
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* Encoding rules to parse or generate a Transform substructure
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*
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* The defined offsets are the positions in a object of type
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* private_transform_substructure_t.
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*
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*/
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encoding_rule_t transform_substructure_encodings[] = {
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_transform_substructure_t, next_payload) },
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/* Reserved Byte is skipped */
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{ RESERVED_BYTE, 0 },
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/* Length of the whole transform substructure*/
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{ PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length) },
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/* transform type is a number of 8 bit */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_type) },
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/* Reserved Byte is skipped */
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{ RESERVED_BYTE, 0 },
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/* tranform ID is a number of 8 bit */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_id) },
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/* Attributes are stored in a transform attribute,
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offset points to a linked_list_t pointer */
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{ TRANSFORM_ATTRIBUTES, offsetof(private_transform_substructure_t, attributes) }
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};
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/**
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* Implements payload_t's and transform_substructure_t's destroy function.
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* See #payload_s.destroy or transform_substructure_s.destroy for description.
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*/
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static status_t destroy(private_transform_substructure_t *this)
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{
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/* all proposals are getting destroyed */
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while (this->attributes->get_count(this->attributes) > 0)
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{
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transform_attribute_t *current_attribute;
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if (this->attributes->remove_last(this->attributes,(void **)¤t_attribute) != SUCCESS)
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{
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break;
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}
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current_attribute->destroy(current_attribute);
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}
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this->attributes->destroy(this->attributes);
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allocator_free(this);
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return SUCCESS;
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}
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/**
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* Implements payload_t's get_encoding_rules function.
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* See #payload_s.get_encoding_rules for description.
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*/
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static status_t get_encoding_rules(private_transform_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = transform_substructure_encodings;
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*rule_count = sizeof(transform_substructure_encodings) / sizeof(encoding_rule_t);
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return SUCCESS;
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}
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/**
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* Implements payload_t's get_type function.
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* See #payload_s.get_type for description.
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*/
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static payload_type_t get_type(private_transform_substructure_t *this)
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{
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return TRANSFORM_SUBSTRUCTURE;
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}
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/**
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* Implements payload_t's get_next_type function.
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* See #payload_s.get_next_type for description.
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*/
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static payload_type_t get_next_type(private_transform_substructure_t *this)
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{
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return (this->next_payload);
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}
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/**
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* Implements payload_t's get_length function.
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* See #payload_s.get_length for description.
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*/
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static size_t get_length(private_transform_substructure_t *this)
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{
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return this->transform_length;
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}
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/**
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* Implements transform_substructure_t's create_transform_attribute_iterator function.
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* See #transform_substructure_s.create_transform_attribute_iterator for description.
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*/
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static status_t create_transform_attribute_iterator (private_transform_substructure_t *this,linked_list_iterator_t **iterator,bool forward)
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{
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return (this->attributes->create_iterator(this->attributes,iterator,forward));
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}
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/**
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* Implements transform_substructure_t's add_transform_attribute function.
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* See #transform_substructure_s.add_transform_attribute for description.
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*/
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static status_t add_transform_attribute (private_transform_substructure_t *this,transform_attribute_t *attribute)
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{
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return (this->attributes->insert_last(this->attributes,(void *) attribute));
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}
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/*
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* Described in header
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*/
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transform_substructure_t *transform_substructure_create()
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{
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private_transform_substructure_t *this = allocator_alloc_thing(private_transform_substructure_t);
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if (this == NULL)
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{
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return NULL;
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}
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this->public.payload_interface.get_encoding_rules = (status_t (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
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this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
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this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
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this->public.create_transform_attribute_iterator = (status_t (*) (transform_substructure_t *,linked_list_iterator_t **,bool)) create_transform_attribute_iterator;
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this->public.add_transform_attribute = (status_t (*) (transform_substructure_t *,transform_attribute_t *)) add_transform_attribute;
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this->public.destroy = (status_t (*) (transform_substructure_t *)) destroy;
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/* set default values of the fields */
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this->next_payload = NO_PAYLOAD;
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this->transform_length = 0;
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this->transform_id = 0;
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this->transform_type = 0;
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this->attributes = linked_list_create();
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if (this->attributes == NULL)
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{
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allocator_free(this);
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return NULL;
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}
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return (&(this->public));
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}
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