/*
* uuid.c
* ------
* UUID support for keystore database.
*
* Copyright (c) 2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <assert.h>
#include "hal.h"
#include "hal_internal.h"
hal_error_t hal_uuid_gen(hal_uuid_t *uuid)
{
hal_error_t err;
if (uuid == NULL)
return HAL_ERROR_BAD_ARGUMENTS;
/*
* Generate a version 4 UUID as specified in RFC 4122.
* This is basically a 122-bit random number.
*/
if ((err = hal_rpc_get_random(uuid->uuid, sizeof(uuid->uuid))) != HAL_OK)
return err;
/*
* Set high order bits of clock_seq_hi_and_reserved and
* time_hi_and_version fields to magic values as specified by RFC
* 4122 section 4.4.
*
* Not recommended reading if you've eaten recently.
*/
uuid->uuid[6] &= 0x0f;
uuid->uuid[6] |= 0x40;
uuid->uuid[8] &= 0x3f;
uuid->uuid[8] |= 0x80;
return HAL_OK;
}
hal_error_t hal_uuid_parse(hal_uuid_t *uuid, const char * const string)
{
static const char fmt[]
= "%2hhx%2hhx%2hhx%2hhx-%2hhx%2hhx-%2hhx%2hhx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx";
if (uuid == NULL || string == NULL ||
sscanf(string, fmt,
uuid->uuid + 0, uuid->uuid + 1, uuid->uuid + 2, uuid->uuid + 3,
uuid->uuid + 4, uuid->uuid + 5, uuid->uuid + 6, uuid->uuid + 7,
uuid->uuid + 8, uuid->uuid + 9, uuid->uuid + 10, uuid->uuid + 11,
uuid->uuid + 12, uuid->uuid + 13, uuid->uuid + 14, uuid->uuid + 15) != 16)
return HAL_ERROR_BAD_ARGUMENTS;
return HAL_OK;
}
hal_error_t hal_uuid_format(const hal_uuid_t * const uuid, char *buffer, const size_t buffer_len)
{
static const char fmt[]
= "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx";
if (uuid == NULL || buffer == NULL || buffer_len < HAL_UUID_TEXT_SIZE)
return HAL_ERROR_BAD_ARGUMENTS;
if (buffer_len != snprintf(buffer, buffer_len, fmt,
uuid->uuid[ 0], uuid->uuid[ 1], uuid->uuid[ 2], uuid->uuid[ 3],
uuid->uuid[ 4], uuid->uuid[ 5], uuid->uuid[ 6], uuid->uuid[ 7],
uuid->uuid[ 8], uuid->uuid[ 9], uuid->uuid[10], uuid->uuid[11],
uuid->uuid[12], uuid->uuid[13], uuid->uuid[14], uuid->uuid[15]))
return HAL_ERROR_RESULT_TOO_LONG;
return HAL_OK;
}
/*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
