+++ /dev/null
-/*
- * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <common/compat/string.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#include "uuid.h"
-
-static const lttng_uuid nil_uuid;
-static bool lttng_uuid_is_init;
-
-void lttng_uuid_to_str(const lttng_uuid uuid, char *uuid_str)
-{
- sprintf(uuid_str, LTTNG_UUID_FMT, LTTNG_UUID_FMT_VALUES(uuid));
-}
-
-int lttng_uuid_from_str(const char *str_in, lttng_uuid uuid_out)
-{
- int ret = 0;
- lttng_uuid uuid_scan;
-
- if ((str_in == NULL) || (uuid_out == NULL)) {
- ret = -1;
- goto end;
- }
-
- if (lttng_strnlen(str_in, LTTNG_UUID_STR_LEN) != LTTNG_UUID_STR_LEN - 1) {
- ret = -1;
- goto end;
- }
-
- /* Scan to a temporary location in case of a partial match. */
- if (sscanf(str_in, LTTNG_UUID_FMT, LTTNG_UUID_SCAN_VALUES(uuid_scan)) !=
- LTTNG_UUID_LEN) {
- ret = -1;
- }
-
- lttng_uuid_copy(uuid_out, uuid_scan);
-end:
- return ret;
-}
-
-bool lttng_uuid_is_equal(const lttng_uuid a, const lttng_uuid b)
-{
- return memcmp(a, b, LTTNG_UUID_LEN) == 0;
-}
-
-bool lttng_uuid_is_nil(const lttng_uuid uuid)
-{
- return memcmp(nil_uuid, uuid, sizeof(lttng_uuid)) == 0;
-}
-
-void lttng_uuid_copy(lttng_uuid dst, const lttng_uuid src)
-{
- memcpy(dst, src, LTTNG_UUID_LEN);
-}
-
-/*
- * Generate a random UUID according to RFC4122, section 4.4.
- */
-int lttng_uuid_generate(lttng_uuid uuid_out)
-{
- int i, ret = 0;
-
- if (uuid_out == NULL) {
- ret = -1;
- goto end;
- }
-
- if (!lttng_uuid_is_init) {
- /*
- * We don't need cryptographic quality randomness to
- * generate UUIDs, seed rand with the epoch.
- */
- const time_t epoch = time(NULL);
-
- if (epoch == (time_t) -1) {
- ret = -1;
- goto end;
- }
- srand(epoch);
-
- lttng_uuid_is_init = true;
- }
-
- /*
- * Generate 16 bytes of random bits.
- */
- for (i = 0; i < LTTNG_UUID_LEN; i++) {
- uuid_out[i] = (uint8_t) rand();
- }
-
- /*
- * Set the two most significant bits (bits 6 and 7) of the
- * clock_seq_hi_and_reserved to zero and one, respectively.
- */
- uuid_out[8] &= ~(1 << 6);
- uuid_out[8] |= (1 << 7);
-
- /*
- * Set the four most significant bits (bits 12 through 15) of the
- * time_hi_and_version field to the 4-bit version number from
- * Section 4.1.3.
- */
- uuid_out[6] &= 0x0f;
- uuid_out[6] |= (LTTNG_UUID_VER << 4);
-
-end:
- return ret;
-}