2005-11-14 12:04:06 +00:00
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/**
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* @file transform_attribute.c
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*
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2005-11-28 18:24:10 +00:00
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* @brief Implementation of transform_attribute_t.
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2005-11-14 12:04:06 +00:00
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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_attribute.h"
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2005-11-23 09:57:18 +00:00
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#include <encoding/payloads/encodings.h>
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2005-11-23 09:08:45 +00:00
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#include <types.h>
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#include <utils/allocator.h>
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2005-11-14 12:04:06 +00:00
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2005-11-24 09:17:51 +00:00
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typedef struct private_transform_attribute_t private_transform_attribute_t;
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Private data of an transform_attribute_t object.
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2005-11-14 12:04:06 +00:00
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*
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*/
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2005-11-24 09:17:51 +00:00
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struct private_transform_attribute_t {
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Public transform_attribute_t interface.
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2005-11-14 12:04:06 +00:00
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*/
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transform_attribute_t public;
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/**
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2005-11-28 18:24:10 +00:00
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* Attribute Format Flag.
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2005-11-14 12:04:06 +00:00
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*
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* - TRUE means value is stored in attribute_length_or_value
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* - FALSE means value is stored in attribute_value
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*/
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bool attribute_format;
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/**
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2005-11-28 18:24:10 +00:00
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* Type of the attribute.
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2005-11-14 12:04:06 +00:00
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*/
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u_int16_t attribute_type;
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/**
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2005-11-28 18:24:10 +00:00
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* Attribute Length if attribute_format is 0, attribute Value otherwise.
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2005-11-14 12:04:06 +00:00
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*/
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2005-11-14 13:51:49 +00:00
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u_int16_t attribute_length_or_value;
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Attribute value as chunk if attribute_format is 0 (FALSE).
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2005-11-14 12:04:06 +00:00
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*/
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chunk_t attribute_value;
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};
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2005-11-16 16:12:31 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* String mappings for transform_attribute_type_t.
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2005-11-16 16:12:31 +00:00
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*/
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mapping_t transform_attribute_type_m[] = {
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{ATTRIBUTE_UNDEFINED, "ATTRIBUTE_UNDEFINED"},
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{KEY_LENGTH, "KEY_LENGTH"},
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{MAPPING_END, NULL}
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};
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Encoding rules to parse or generate a Transform attribute.
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2005-11-14 12:04:06 +00:00
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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_attribute_t.
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*
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*/
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encoding_rule_t transform_attribute_encodings[] = {
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/* Flag defining the format of this payload */
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{ ATTRIBUTE_FORMAT, offsetof(private_transform_attribute_t, attribute_format) },
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/* type of the attribute as 15 bit unsigned integer */
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{ ATTRIBUTE_TYPE, offsetof(private_transform_attribute_t, attribute_type) },
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/* Length or value, depending on the attribute format flag */
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{ ATTRIBUTE_LENGTH_OR_VALUE, offsetof(private_transform_attribute_t, attribute_length_or_value) },
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/* Value of attribute if attribute format flag is zero */
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{ ATTRIBUTE_VALUE, offsetof(private_transform_attribute_t, attribute_value) }
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};
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2005-11-17 12:49:35 +00:00
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/*
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1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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!A! Attribute Type ! AF=0 Attribute Length !
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!F! ! AF=1 Attribute Value !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! AF=0 Attribute Value !
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! AF=1 Not Transmitted !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of payload_t.verify.
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2005-11-17 12:49:35 +00:00
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*/
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static status_t verify(private_transform_attribute_t *this)
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{
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if (this->attribute_type != KEY_LENGTH)
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{
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return FAILED;
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}
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return SUCCESS;
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}
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of payload_t.get_encoding_rules.
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2005-11-14 12:04:06 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void get_encoding_rules(private_transform_attribute_t *this, encoding_rule_t **rules, size_t *rule_count)
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2005-11-14 12:04:06 +00:00
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{
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*rules = transform_attribute_encodings;
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*rule_count = sizeof(transform_attribute_encodings) / sizeof(encoding_rule_t);
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of payload_t.get_type.
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2005-11-14 12:04:06 +00:00
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*/
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static payload_type_t get_type(private_transform_attribute_t *this)
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{
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return TRANSFORM_ATTRIBUTE;
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of payload_t.get_next_type.
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2005-11-14 12:04:06 +00:00
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*/
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static payload_type_t get_next_type(private_transform_attribute_t *this)
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{
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return (NO_PAYLOAD);
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}
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2005-11-15 09:14:45 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of payload_t.set_next_type.
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2005-11-15 09:14:45 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void set_next_type(private_transform_attribute_t *this,payload_type_t type)
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2005-11-15 09:14:45 +00:00
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{
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}
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2005-11-14 12:04:06 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.get_length.
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2005-11-14 12:04:06 +00:00
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*/
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static size_t get_length(private_transform_attribute_t *this)
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{
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if (this->attribute_format == TRUE)
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{
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/*Attribute size is only 4 byte */
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return 4;
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}
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return (this->attribute_length_or_value + 4);
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}
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2005-11-28 18:24:10 +00:00
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2005-11-14 13:51:49 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.set_value_chunk.
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2005-11-14 13:51:49 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void set_value_chunk(private_transform_attribute_t *this, chunk_t value)
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2005-11-14 13:51:49 +00:00
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{
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2005-11-14 16:03:26 +00:00
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if (this->attribute_value.ptr != NULL)
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{
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/* free existing value */
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allocator_free(this->attribute_value.ptr);
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this->attribute_value.ptr = NULL;
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this->attribute_value.len = 0;
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}
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2005-11-14 13:51:49 +00:00
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if (value.len > 2)
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{
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this->attribute_value.ptr = allocator_clone_bytes(value.ptr,value.len);
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this->attribute_value.len = value.len;
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this->attribute_length_or_value = value.len;
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/* attribute has not a fixed length */
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this->attribute_format = FALSE;
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}
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else
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{
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memcpy(&(this->attribute_length_or_value),value.ptr,value.len);
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}
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.set_value.
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2005-11-16 16:12:31 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void set_value(private_transform_attribute_t *this, u_int16_t value)
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2005-11-16 16:12:31 +00:00
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{
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if (this->attribute_value.ptr != NULL)
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{
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/* free existing value */
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allocator_free(this->attribute_value.ptr);
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this->attribute_value.ptr = NULL;
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this->attribute_value.len = 0;
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}
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this->attribute_length_or_value = value;
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.get_value_chunk.
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2005-11-14 13:51:49 +00:00
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*/
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2005-11-16 16:12:31 +00:00
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static chunk_t get_value_chunk (private_transform_attribute_t *this)
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2005-11-14 13:51:49 +00:00
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{
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chunk_t value;
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if (this->attribute_format == FALSE)
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{
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value.ptr = this->attribute_value.ptr;
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value.len = this->attribute_value.len;
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}
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else
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{
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value.ptr = (void *) &(this->attribute_length_or_value);
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value.len = 2;
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}
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return value;
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}
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2005-11-16 16:12:31 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.get_value.
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2005-11-16 16:12:31 +00:00
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*/
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static u_int16_t get_value (private_transform_attribute_t *this)
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{
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return this->attribute_length_or_value;
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}
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2005-11-14 13:51:49 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.set_attribute_type.
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2005-11-14 13:51:49 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void set_attribute_type (private_transform_attribute_t *this, u_int16_t type)
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2005-11-14 13:51:49 +00:00
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{
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this->attribute_type = type & 0x7FFF;
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.get_attribute_type.
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2005-11-14 13:51:49 +00:00
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*/
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static u_int16_t get_attribute_type (private_transform_attribute_t *this)
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{
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return this->attribute_type;
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}
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2005-11-14 12:04:06 +00:00
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2005-11-21 13:44:16 +00:00
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.clone.
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2005-11-21 13:44:16 +00:00
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*/
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2005-11-29 08:54:48 +00:00
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static transform_attribute_t * clone(private_transform_attribute_t *this)
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2005-11-21 13:44:16 +00:00
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{
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private_transform_attribute_t *new_clone;
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new_clone = (private_transform_attribute_t *) transform_attribute_create();
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new_clone->attribute_format = this->attribute_format;
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new_clone->attribute_type = this->attribute_type;
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new_clone->attribute_length_or_value = this->attribute_length_or_value;
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if (!new_clone->attribute_format)
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{
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new_clone->attribute_value.ptr = allocator_clone_bytes(this->attribute_value.ptr,this->attribute_value.len);
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new_clone->attribute_value.len = this->attribute_value.len;
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}
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2005-11-29 08:54:48 +00:00
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return (transform_attribute_t *) new_clone;
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2005-11-21 13:44:16 +00:00
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}
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/**
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2005-11-28 18:24:10 +00:00
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* Implementation of transform_attribute_t.destroy and payload_t.destroy.
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2005-11-21 13:44:16 +00:00
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*/
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2005-11-28 18:24:10 +00:00
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static void destroy(private_transform_attribute_t *this)
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2005-11-21 13:44:16 +00:00
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{
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if (this->attribute_value.ptr != NULL)
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{
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allocator_free(this->attribute_value.ptr);
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}
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allocator_free(this);
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}
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2005-11-14 12:04:06 +00:00
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/*
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2005-11-28 18:24:10 +00:00
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* Described in header.
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2005-11-14 12:04:06 +00:00
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*/
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transform_attribute_t *transform_attribute_create()
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{
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private_transform_attribute_t *this = allocator_alloc_thing(private_transform_attribute_t);
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2005-11-28 18:24:10 +00:00
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2005-11-17 12:49:35 +00:00
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/* payload interface */
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this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
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2005-11-28 18:24:10 +00:00
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this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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2005-11-14 12:04:06 +00:00
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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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2005-11-28 18:24:10 +00:00
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this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
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2005-11-14 12:04:06 +00:00
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
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2005-11-28 18:24:10 +00:00
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this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
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2005-11-17 12:49:35 +00:00
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/* public functions */
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2005-11-28 18:24:10 +00:00
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this->public.set_value_chunk = (void (*) (transform_attribute_t *,chunk_t)) set_value_chunk;
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this->public.set_value = (void (*) (transform_attribute_t *,u_int16_t)) set_value;
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2005-11-16 16:12:31 +00:00
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this->public.get_value_chunk = (chunk_t (*) (transform_attribute_t *)) get_value_chunk;
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this->public.get_value = (u_int16_t (*) (transform_attribute_t *)) get_value;
|
2005-11-28 18:24:10 +00:00
|
|
|
this->public.set_attribute_type = (void (*) (transform_attribute_t *,u_int16_t type)) set_attribute_type;
|
2005-11-14 13:51:49 +00:00
|
|
|
this->public.get_attribute_type = (u_int16_t (*) (transform_attribute_t *)) get_attribute_type;
|
2005-11-29 08:54:48 +00:00
|
|
|
this->public.clone = (transform_attribute_t * (*) (transform_attribute_t *)) clone;
|
2005-11-28 18:24:10 +00:00
|
|
|
this->public.destroy = (void (*) (transform_attribute_t *)) destroy;
|
2005-11-14 12:04:06 +00:00
|
|
|
|
|
|
|
/* 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));
|
|
|
|
}
|
|
|
|
|
2005-12-01 08:48:57 +00:00
|
|
|
/*
|
|
|
|
* Described in header.
|
|
|
|
*/
|
|
|
|
transform_attribute_t *transform_attribute_create_key_length(u_int16_t key_length)
|
|
|
|
{
|
|
|
|
transform_attribute_t *attribute = transform_attribute_create();
|
|
|
|
attribute->set_attribute_type(attribute,KEY_LENGTH);
|
|
|
|
attribute->set_value(attribute,key_length);
|
|
|
|
return attribute;
|
|
|
|
}
|