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/**
* @file proposal_substructure.h
*
* @brief Declaration of the class proposal_substructure_t.
*
* An object of this type represents an IKEv2 PROPOSAL Substructure and contains transforms.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, 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.
*/
/* offsetof macro */
#include <stddef.h>
#include "proposal_substructure.h"
#include "encodings.h"
#include "transform_substructure.h"
#include "../types.h"
#include "../utils/allocator.h"
#include "../utils/linked_list.h"
/**
* Private data of an proposal_substructure_t' Object
*
*/
typedef struct private_proposal_substructure_s private_proposal_substructure_t;
struct private_proposal_substructure_s {
/**
* public proposal_substructure_t interface
*/
proposal_substructure_t public;
/**
* next payload type
*/
u_int8_t next_payload;
/**
* Length of this payload
*/
u_int16_t proposal_length;
/**
* Proposal number
*/
u_int8_t proposal_number;
/**
* Protocol ID
*/
u_int8_t protocol_id;
/**
* SPI size of the following SPI
*/
u_int8_t spi_size;
/**
* Number of transforms
*/
u_int8_t transforms_count;
/**
* SPI is stored as chunk
*/
chunk_t spi;
/**
* Transforms are stored in a linked_list_t
*/
linked_list_t * transforms;
};
/**
* Encoding rules to parse or generate a Proposal substructure
*
* The defined offsets are the positions in a object of type
* private_proposal_substructure_t.
*
*/
encoding_rule_t proposal_substructure_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_proposal_substructure_t, next_payload) },
/* Reserved Byte is skipped */
{ RESERVED_BYTE, 0 },
/* Length of the whole proposal substructure payload*/
{ PAYLOAD_LENGTH, offsetof(private_proposal_substructure_t, proposal_length) },
/* proposal number is a number of 8 bit */
{ U_INT_8, offsetof(private_proposal_substructure_t, proposal_number) },
/* protocol ID is a number of 8 bit */
{ U_INT_8, offsetof(private_proposal_substructure_t, protocol_id) },
/* SPI Size has its own type */
{ SPI_SIZE, offsetof(private_proposal_substructure_t, spi_size) },
/* Number of transforms is a number of 8 bit */
{ U_INT_8, offsetof(private_proposal_substructure_t, transforms_count) },
/* SPI is a chunk of variable size*/
{ SPI, offsetof(private_proposal_substructure_t, spi) },
/* Transforms are stored in a transform substructure,
offset points to a linked_list_t pointer */
{ TRANSFORMS, offsetof(private_proposal_substructure_t, transforms) }
};
/**
* Implements payload_t's and proposal_substructure_t's destroy function.
* See #payload_s.destroy or proposal_substructure_s.destroy for description.
*/
static status_t destroy(private_proposal_substructure_t *this)
{
/* all proposals are getting destroyed */
while (this->transforms->get_count(this->transforms) > 0)
{
transform_substructure_t *current_transform;
if (this->transforms->remove_last(this->transforms,(void **)¤t_transform) != SUCCESS)
{
break;
}
current_transform->destroy(current_transform);
}
this->transforms->destroy(this->transforms);
if (this->spi.ptr != NULL)
{
allocator_free(this->spi.ptr);
}
allocator_free(this);
return SUCCESS;
}
/**
* Implements payload_t's get_encoding_rules function.
* See #payload_s.get_encoding_rules for description.
*/
static status_t get_encoding_rules(private_proposal_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = proposal_substructure_encodings;
*rule_count = sizeof(proposal_substructure_encodings) / sizeof(encoding_rule_t);
return SUCCESS;
}
/**
* Implements payload_t's get_type function.
* See #payload_s.get_type for description.
*/
static payload_type_t get_type(private_proposal_substructure_t *this)
{
return PROPOSAL_SUBSTRUCTURE;
}
/**
* Implements payload_t's get_next_type function.
* See #payload_s.get_next_type for description.
*/
static payload_type_t get_next_type(private_proposal_substructure_t *this)
{
return (this->next_payload);
}
/**
* Implements payload_t's get_length function.
* See #payload_s.get_length for description.
*/
static size_t get_length(private_proposal_substructure_t *this)
{
return this->proposal_length;
}
/**
* Implements proposal_substructure_t's create_transform_substructure_iterator function.
* See #proposal_substructure_s.create_transform_substructure_iterator for description.
*/
static status_t create_transform_substructure_iterator (private_proposal_substructure_t *this,linked_list_iterator_t **iterator,bool forward)
{
return (this->transforms->create_iterator(this->transforms,iterator,forward));
}
/**
* Implements proposal_substructure_t's add_transform_substructure function.
* See #proposal_substructure_s.add_transform_substructure for description.
*/
static status_t add_transform_substructure (private_proposal_substructure_t *this,transform_substructure_t *transform)
{
return (this->transforms->insert_last(this->transforms,(void *) transform));
}
/*
* Described in header
*/
proposal_substructure_t *proposal_substructure_create()
{
private_proposal_substructure_t *this = allocator_alloc_thing(private_proposal_substructure_t);
if (this == NULL)
{
return NULL;
}
this->public.payload_interface.get_encoding_rules = (status_t (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
this->public.create_transform_substructure_iterator = (status_t (*) (proposal_substructure_t *,linked_list_iterator_t **,bool)) create_transform_substructure_iterator;
this->public.add_transform_substructure = (status_t (*) (proposal_substructure_t *,transform_substructure_t *)) add_transform_substructure;
this->public.destroy = (status_t (*) (proposal_substructure_t *)) destroy;
/* set default values of the fields */
this->next_payload = NO_PAYLOAD;
this->proposal_length = 0;
this->proposal_number = 0;
this->protocol_id = 0;
this->transforms_count = 0;
this->spi_size = 0;
this->spi.ptr = NULL;
this->spi.len = 0;
this->transforms = linked_list_create();
if (this->transforms == NULL)
{
allocator_free(this);
return NULL;
}
return (&(this->public));
}
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