uuid.c

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/* -*- C -*- */
/*
 * Copyright (c) 2012-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#include "lib/uuid.h"
#include "lib/atomic.h"
#include "lib/errno.h"
#include "lib/time.h"
#include "lib/string.h"      /* isxdigit */
#include "lib/misc.h"        /* ARRAY_SIZE, m0_strtou64 */

#ifdef __KERNEL__
#  include <linux/uuid.h>    /* generate_random_uuid */
#else
#  include <uuid/uuid.h>     /* generate_uuid */
#endif

#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_LIB
#include "lib/trace.h"

M0_BASSERT(sizeof (struct m0_uint128) == sizeof (char[16]));
#ifndef __KERNEL__
M0_BASSERT(sizeof (struct m0_uint128) == sizeof (uuid_t));
#endif

M0_INTERNAL void m0_uuid_generate(struct m0_uint128 *u)
{
#ifdef __KERNEL__
        generate_random_uuid((unsigned char *)u);
#else
        uuid_generate((unsigned char *)u);
#endif
}

static int parse_hex(const char *str, int len, uint64_t *val)
{
        int i;
        char buf[17];

        M0_ASSERT(len < ARRAY_SIZE(buf));
        for (i = 0; i < len; ++i) {
                if (*str == '\0')
                        return M0_ERR(-EINVAL);
                if (!isxdigit(*str))
                        return M0_ERR(-EINVAL);
                buf[i] = *str++;
        }
        buf[i] = '\0';
        *val = m0_strtou64(buf, NULL, 16);

        return 0;
}

M0_INTERNAL int m0_uuid_parse(const char *str, struct m0_uint128 *val)
{
        uint64_t h1;
        uint64_t h2;
        uint64_t h3;
        uint64_t h4;
        uint64_t h5;

        val->u_hi = val->u_lo = 0;
        if (parse_hex(&str[0],   8, &h1) < 0 || str[8]  != '-' ||
            parse_hex(&str[9],   4, &h2) < 0 || str[13] != '-' ||
            parse_hex(&str[14],  4, &h3) < 0 || str[18] != '-' ||
            parse_hex(&str[19],  4, &h4) < 0 || str[23] != '-' ||
            parse_hex(&str[24], 12, &h5) < 0 || str[36] != '\0') {
                if (parse_hex(&str[0],   8, &h1) < 0 ||
                    parse_hex(&str[8],   4, &h2) < 0 ||
                    parse_hex(&str[12],  4, &h3) < 0 ||
                    parse_hex(&str[16],  4, &h4) < 0 ||
                    parse_hex(&str[20], 12, &h5) < 0 || str[32] != '\0') {
                        return M0_ERR(-EINVAL);
                }
        }

        val->u_hi = h1 << 32 | h2 << 16 | h3;
        val->u_lo = h4 << 48 | h5;
        /* no validation of adherence to standard version formats */
        return 0;
}
M0_EXPORTED(m0_uuid_parse);

M0_INTERNAL void m0_uuid_format(const struct m0_uint128 *val,
                                char *buf, size_t len)
{
        static const char *fmt = "%08x-%04x-%04x-%04x-%012lx";
        uint32_t h1;
        uint32_t h2;
        uint32_t h3;
        uint32_t h4;
        uint64_t h5;

        M0_ASSERT(len > M0_UUID_STRLEN);
        h1 = val->u_hi >> 32;
        h2 = (val->u_hi >> 16) & 0xffff;
        h3 = val->u_hi & 0xffff;
        h4 = val->u_lo >> 48;
        h5 = val->u_lo & 0xffffffffffff;
        sprintf(buf, fmt, h1, h2, h3, h4, h5);
}

M0_INTERNAL struct m0_uint128 m0_node_uuid;

int m0_node_uuid_init(void)
{
        char               buf[M0_UUID_STRLEN + 1];
        struct m0_uint128 *uuid = &m0_node_uuid;
        int                rc;

        M0_SET0(uuid);
        rc = m0_node_uuid_string_get(buf);
        if (rc == 0) {
                rc = m0_uuid_parse(buf, uuid);
                if (rc == 0) {
                        m0_uuid_format(uuid, buf, ARRAY_SIZE(buf));
                        M0_LOG(M0_NOTICE, "Node uuid: %s", (char *)buf);
                } else
                        M0_LOG(M0_ERROR, "Unable to parse node UUID string");
        } else
                M0_LOG(M0_ERROR, "Unable to fetch node UUID string");
        return M0_RC(rc);
}

#undef M0_TRACE_SUBSYSTEM

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */