ceph/src/pmdk/src/common/uuid.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /* Copyright 2014-2018, Intel Corporation */
   3
   4 /*
   5  * uuid.c -- uuid utilities
   6  */
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include "uuid.h"
  12 #include "out.h"
  13
  14 /*
  15  * util_uuid_to_string -- generate a string form of the uuid
  16  */
  17 int
  18 util_uuid_to_string(const uuid_t u, char *buf)
  19 {
  20         int len; /* size that is returned from sprintf call */
  21
  22         if (buf == NULL) {
  23                 LOG(2, "invalid buffer for uuid string");
  24                 return -1;
  25         }
  26
  27         if (u == NULL) {
  28                 LOG(2, "invalid uuid structure");
  29                 return -1;
  30         }
  31
  32         struct uuid *uuid = (struct uuid *)u;
  33         len = snprintf(buf, POOL_HDR_UUID_STR_LEN,
  34                 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  35                 uuid->time_low, uuid->time_mid, uuid->time_hi_and_ver,
  36                 uuid->clock_seq_hi, uuid->clock_seq_low, uuid->node[0],
  37                 uuid->node[1], uuid->node[2], uuid->node[3], uuid->node[4],
  38                 uuid->node[5]);
  39
  40         if (len != POOL_HDR_UUID_STR_LEN - 1) {
  41                 LOG(2, "snprintf(uuid): %d", len);
  42                 return -1;
  43         }
  44
  45         return 0;
  46 }
  47
  48 /*
  49  * util_uuid_from_string -- generate a binary form of the uuid
  50  *
  51  * uuid string read from /proc/sys/kernel/random/uuid. UUID string
  52  * format example:
  53  * f81d4fae-7dec-11d0-a765-00a0c91e6bf6
  54  */
  55 int
  56 util_uuid_from_string(const char *uuid, struct uuid *ud)
  57 {
  58         if (strlen(uuid) != 36) {
  59                 LOG(2, "invalid uuid string");
  60                 return -1;
  61         }
  62
  63         if (uuid[8] != '-' || uuid[13] != '-' || uuid[18] != '-' ||
  64                         uuid[23] != '-') {
  65                 LOG(2, "invalid uuid string");
  66                 return -1;
  67         }
  68
  69         int n = sscanf(uuid,
  70                 "%08x-%04hx-%04hx-%02hhx%02hhx-"
  71                 "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
  72                 &ud->time_low, &ud->time_mid, &ud->time_hi_and_ver,
  73                 &ud->clock_seq_hi, &ud->clock_seq_low, &ud->node[0],
  74                 &ud->node[1], &ud->node[2], &ud->node[3], &ud->node[4],
  75                 &ud->node[5]);
  76
  77         if (n != 11) {
  78                 LOG(2, "sscanf(uuid)");
  79                 return -1;
  80         }
  81
  82         return 0;
  83 }