diff options
Diffstat (limited to 'uuid.c')
| -rw-r--r-- | uuid.c | 111 |
1 files changed, 111 insertions, 0 deletions
@@ -0,0 +1,111 @@ +/* + * 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 (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]) != HAL_UUID_TEXT_SIZE - 1) + return HAL_ERROR_RESULT_TOO_LONG; + + return HAL_OK; +} + + +/* + * Local variables: + * indent-tabs-mode: nil + * End: + */ |