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/**
* @file transform_attribute.c
*
* @brief Declaration of the class transform_attribute_t.
*
* An object of this type represents an IKEv2 TRANSFORM attribute.
*
*/
/*
* 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 "transform_attribute.h"
#include "encodings.h"
#include "../types.h"
#include "../utils/allocator.h"
/**
* Private data of an transform_attribute_t Object
*
*/
typedef struct private_transform_attribute_s private_transform_attribute_t;
struct private_transform_attribute_s {
/**
* public transform_attribute_t interface
*/
transform_attribute_t public;
/**
* Attribute Format Flag
*
* - TRUE means value is stored in attribute_length_or_value
* - FALSE means value is stored in attribute_value
*/
bool attribute_format;
/**
* Type of the attribute
*/
u_int16_t attribute_type;
/**
* Attribute Length if attribute_format is 0, attribute Value otherwise
*/
u_int16_t attribute_length_or_value;
/**
* Attribute value as chunk if attribute_format is 0 (FALSE)
*/
chunk_t attribute_value;
};
/**
* Encoding rules to parse or generate a Transform attribute
*
* The defined offsets are the positions in a object of type
* private_transform_attribute_t.
*
*/
encoding_rule_t transform_attribute_encodings[] = {
/* Flag defining the format of this payload */
{ ATTRIBUTE_FORMAT, offsetof(private_transform_attribute_t, attribute_format) },
/* type of the attribute as 15 bit unsigned integer */
{ ATTRIBUTE_TYPE, offsetof(private_transform_attribute_t, attribute_type) },
/* Length or value, depending on the attribute format flag */
{ ATTRIBUTE_LENGTH_OR_VALUE, offsetof(private_transform_attribute_t, attribute_length_or_value) },
/* Value of attribute if attribute format flag is zero */
{ ATTRIBUTE_VALUE, offsetof(private_transform_attribute_t, attribute_value) }
};
/**
* Implements payload_t's and transform_attribute_t's destroy function.
* See #payload_s.destroy or transform_attribute_s.destroy for description.
*/
static status_t destroy(private_transform_attribute_t *this)
{
if (this->attribute_value.ptr != NULL)
{
allocator_free(this->attribute_value.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_transform_attribute_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = transform_attribute_encodings;
*rule_count = sizeof(transform_attribute_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_transform_attribute_t *this)
{
return TRANSFORM_ATTRIBUTE;
}
/**
* Implements payload_t's get_next_type function.
* See #payload_s.get_next_type for description.
*/
static payload_type_t get_next_type(private_transform_attribute_t *this)
{
return (NO_PAYLOAD);
}
/**
* Implements payload_t's set_next_type function.
* See #payload_s.set_next_type for description.
*/
static status_t set_next_type(private_transform_attribute_t *this,payload_type_t type)
{
return SUCCESS;
}
/**
* Implements payload_t's get_length function.
* See #payload_s.get_length for description.
*/
static size_t get_length(private_transform_attribute_t *this)
{
if (this->attribute_format == TRUE)
{
/*Attribute size is only 4 byte */
return 4;
}
return (this->attribute_length_or_value + 4);
}
/**
* Implements transform_attribute_t's set_value function.
* See #transform_attribute_s.set_value for description.
*/
static status_t set_value (private_transform_attribute_t *this, chunk_t value)
{
if (this->attribute_value.ptr != NULL)
{
/* free existing value */
allocator_free(this->attribute_value.ptr);
this->attribute_value.ptr = NULL;
this->attribute_value.len = 0;
}
if (value.len > 2)
{
this->attribute_value.ptr = allocator_clone_bytes(value.ptr,value.len);
if (this->attribute_value.ptr == NULL)
{
return OUT_OF_RES;
}
this->attribute_value.len = value.len;
this->attribute_length_or_value = value.len;
/* attribute has not a fixed length */
this->attribute_format = FALSE;
}
else
{
memcpy(&(this->attribute_length_or_value),value.ptr,value.len);
}
return SUCCESS;
}
/**
* Implements transform_attribute_t's get_value function.
* See #transform_attribute_s.get_value for description.
*/
static chunk_t get_value (private_transform_attribute_t *this)
{
chunk_t value;
if (this->attribute_format == FALSE)
{
value.ptr = this->attribute_value.ptr;
value.len = this->attribute_value.len;
}
else
{
value.ptr = (void *) &(this->attribute_length_or_value);
value.len = 2;
}
return value;
}
/**
* Implements transform_attribute_t's set_attribute_type function.
* See #transform_attribute_s.set_attribute_type for description.
*/
static status_t set_attribute_type (private_transform_attribute_t *this, u_int16_t type)
{
this->attribute_type = type & 0x7FFF;
return SUCCESS;
}
/**
* Implements transform_attribute_t's get_attribute_type function.
* See #transform_attribute_s.get_attribute_type for description.
*/
static u_int16_t get_attribute_type (private_transform_attribute_t *this)
{
return this->attribute_type;
}
/*
* Described in header
*/
transform_attribute_t *transform_attribute_create()
{
private_transform_attribute_t *this = allocator_alloc_thing(private_transform_attribute_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.set_next_type = (status_t (*) (payload_t *,payload_type_t)) set_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.set_value = (status_t (*) (transform_attribute_t *,chunk_t value)) set_value;
this->public.get_value = (chunk_t (*) (transform_attribute_t *)) get_value;
this->public.set_attribute_type = (status_t (*) (transform_attribute_t *,u_int16_t type)) set_attribute_type;
this->public.get_attribute_type = (u_int16_t (*) (transform_attribute_t *)) get_attribute_type;
this->public.destroy = (status_t (*) (transform_attribute_t *)) destroy;
/* set default values of the fields */
this->attribute_format = TRUE;
this->attribute_type = 0;
this->attribute_length_or_value = 0;
this->attribute_value.ptr = NULL;
this->attribute_value.len = 0;
return (&(this->public));
}
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