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/**
* @file generator.c
*
* @brief Generic generator class used to generate IKEv2-Header and Payload
*
*/
/*
* 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.
*/
#include <stdlib.h>
#include <freeswan.h>
#include <pluto/constants.h>
#include <pluto/defs.h>
#include "allocator.h"
#include "types.h"
#include "generator.h"
/**
* Private data of a generator_t object
*/
typedef struct private_generator_s private_generator_t;
struct private_generator_s {
/**
* Public part of a generator object
*/
generator_t public;
/* private functions and fields */
/**
* Generates a chunk_t with specific encoding rules
*
* items are bytewhise written
*
* @param this private_generator_t-object
* @param data_struct data_struct to read data from
* @param encoding_rules pointer to first encoding_rule of encoding rules array
* @param encoding_rules_count number of encoding rules in encoding rules array
* @param data pointer to chunk where to write the data in
*
* @return SUCCESS if succeeded,
* OUT_OF_RES if out of ressources
*/
status_t (*generate) (private_generator_t *this,void * data_struct,encoding_rule_t *encoding_rules, size_t encoding_rules_count, chunk_t *data);
/**
* TODO
*/
status_t (*generate_u_int_type) (private_generator_t *this,encoding_type_t int_type,u_int8_t **buffer,u_int8_t **out_position,u_int8_t **roof_position,size_t *current_bit);
/**
* Pointer to the payload informations needed to automatic
* generate a specific payload type
*/
payload_info_t **payload_infos;
};
/**
* implements private_generator_t's generate_u_int_type function
*/
static status_t generate_u_int_type (private_generator_t *this,encoding_type_t int_type,u_int8_t **buffer,u_int8_t **out_position,u_int8_t **roof_position,size_t *current_bit)
{
size_t number_of_bits = 0;
switch (int_type)
{
case U_INT_4:
number_of_bits = 4;
break;
case U_INT_8:
number_of_bits = 8;
break;
case U_INT_16:
number_of_bits = 16;
break;
case U_INT_32:
number_of_bits = 32;
break;
case U_INT_64:
number_of_bits = 64;
break;
default:
return FAILED;
}
return SUCCESS;
}
/**
* implements private_generator_t's generate function
*/
static status_t generate (private_generator_t *this,void * data_struct,encoding_rule_t *encoding_rules, size_t encoding_rules_count, chunk_t *data)
{
u_int8_t * buffer = allocator_alloc(GENERATOR_DATA_BUFFER_SIZE);
u_int8_t * out_position = buffer;
u_int8_t * roof_position = buffer + GENERATOR_DATA_BUFFER_SIZE;
size_t current_bit = 0;
int i;
if (buffer == NULL)
{
return OUT_OF_RES;
}
for (i = 0; i < encoding_rules_count;i++)
{
status_t status = SUCCESS;
switch (encoding_rules[i].type)
{
case U_INT_4:
case U_INT_8:
case U_INT_16:
case U_INT_32:
case U_INT_64:
status = this->generate_u_int_type(this,encoding_rules[i].type,&buffer,&out_position,&roof_position,¤t_bit);
break;
case RESERVED_BIT:
case RESERVED_BYTE:
case FLAG:
case LENGTH:
case SPI_SIZE:
default:
break;
}
if (status != SUCCESS)
{
allocator_free(buffer);
return status;
}
}
return SUCCESS;
}
static status_t generate_payload (private_generator_t *this,payload_type_t payload_type,void * data_struct, chunk_t *data)
{
int i;
/* check every payload info for specific type */
for (i = 0; this->payload_infos[i] != NULL; i++)
{
if (this->payload_infos[i]->payload_type == payload_type)
{
/* found payload informations, generating is done in private function generate() */
return (this->generate(this, data_struct,this->payload_infos[i]->ecoding_rules,this->payload_infos[i]->encoding_rules_count,data));
}
}
return NOT_SUPPORTED;
}
/**
* Implementation of generator_t's destroy function
*/
static status_t destroy(private_generator_t *this)
{
if (this == NULL)
{
return FAILED;
}
allocator_free(this);
return SUCCESS;
}
/*
* Described in header
*/
generator_t * generator_create(payload_info_t ** payload_infos)
{
private_generator_t *this;
if (payload_infos == NULL)
{
return NULL;
}
this = allocator_alloc_thing(private_generator_t);
if (this == NULL)
{
return NULL;
}
this->public.generate_payload = (status_t(*)(generator_t*, payload_type_t, void *, chunk_t *)) generate_payload;
this->public.destroy = (status_t(*)(generator_t*)) destroy;
/* initiate private fields */
this->generate = generate;
this->generate_u_int_type = generate_u_int_type;
this->payload_infos = payload_infos;
return &(this->public);
}
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