src/opr/uuid.c

   1 /*
   2  * Copyright (c) 2012 Your File System Inc. All rights reserved.
   3  */
   4
   5 #include <afsconfig.h>
   6 #include <afs/param.h>
   7
   8 #include <roken.h>
   9
  10 #ifdef HAVE_UUID_UUID_H
  11 # include <uuid/uuid.h>
  12 #endif
  13
  14 #ifdef AFS_NT40_ENV
  15 # include <rpc.h>
  16 #endif
  17
  18 #include <hcrypto/rand.h>
  19
  20 #include "uuid.h"
  21 #include "jhash.h"
  22
  23 static const opr_uuid_t nilUid = {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
  24
  25 void
  26 opr_uuid_create(opr_uuid_t *uuid)
  27 {
  28 #if defined (AFS_NT40_ENV)
  29     struct opr_uuid_unpacked raw;
  30
  31     UuidCreate((UUID *) &raw);
  32     opr_uuid_pack(uuid, &raw);
  33
  34 #elif !defined(KERNEL) && defined(HAVE_UUID_GENERATE)
  35
  36     uuid_generate(uuid->data);
  37
  38 #else
  39     RAND_bytes(uuid->data, 16);
  40
  41     uuid->data[6] = (uuid->data[6] & 0x0F) | 0x40; /* verison is 4 */
  42     uuid->data[8] = (uuid->data[8] & 0x3F) | 0x80; /* variant is DCE */
  43 #endif
  44 }
  45
  46 int
  47 opr_uuid_isNil(const opr_uuid_t *uuid)
  48 {
  49    return opr_uuid_equal(uuid, &nilUid);
  50 }
  51
  52 int
  53 opr_uuid_equal(const opr_uuid_t *uuid1, const opr_uuid_t *uuid2)
  54 {
  55    return memcmp(uuid1, uuid2, sizeof(opr_uuid_t)) == 0;
  56 }
  57
  58 unsigned int
  59 opr_uuid_hash(const opr_uuid_t *uuid)
  60 {
  61    return opr_jhash_opaque(uuid->data, sizeof(uuid->data), 0);
  62 }
  63
  64 #if !defined(KERNEL)
  65 int
  66 opr_uuid_toString(const opr_uuid_t *uuid, char **string)
  67 {
  68    unsigned const char *p;
  69    int r;
  70
  71    p = uuid->data;
  72    r = asprintf(string,
  73                 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
  74                 "%02x%02x%02x%02x%02x%02x",
  75                 p[0], p[1], p[2],  p[3],  p[4],  p[5],  p[6],  p[7],
  76                 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
  77    if (r < 0) {
  78        *string = NULL;
  79        return ENOMEM;
  80    }
  81    return 0;
  82 }
  83
  84 void
  85 opr_uuid_freeString(char *string)
  86 {
  87     free(string);
  88 }
  89
  90 int
  91 opr_uuid_fromString(opr_uuid_t *uuid, const char *string)
  92 {
  93     unsigned int i[16];
  94     int items, c;
  95
  96     /* XXX - Traditionally, AFS has printed UUIDs as
  97      * 00000000-0000-00-00-00000000. We should perhaps also accept
  98      * that format here
  99      */
 100     items = sscanf(string,
 101                    "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
 102                    "%02x%02x%02x%02x%02x%02x",
 103                    &i[0],  &i[1],  &i[2],  &i[3], &i[4],  &i[5],
 104                    &i[6],  &i[7],  &i[8],  &i[9], &i[10], &i[11],
 105                    &i[12], &i[13], &i[14], &i[15]);
 106     if (items !=16) {
 107         /* Originally, AFS's printed UUIDs would take the form
 108          * 00000000-0000-0000-00-00-00000000. Also handle this. */
 109         items = sscanf(string,
 110                    "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x-%02x-"
 111                    "%02x%02x%02x%02x%02x%02x",
 112                    &i[0],  &i[1],  &i[2],  &i[3], &i[4],  &i[5],
 113                    &i[6],  &i[7],  &i[8],  &i[9], &i[10], &i[11],
 114                    &i[12], &i[13], &i[14], &i[15]);
 115     }
 116     if (items !=16)
 117         return EINVAL;
 118
 119     for (c=0; c<16; c++)
 120         uuid->data[c] = i[c];
 121
 122     return 0;
 123 }
 124
 125 #endif
 126
 127 void
 128 opr_uuid_pack(opr_uuid_t *uuid, const struct opr_uuid_unpacked *raw)
 129 {
 130     afs_uint32 intval;
 131     unsigned short shortval;
 132
 133     intval = htonl(raw->time_low);
 134     memcpy(&uuid->data[0], &intval, sizeof(uint32_t));
 135
 136     shortval = htons(raw->time_mid);
 137     memcpy(&uuid->data[4], &shortval, sizeof(uint16_t));
 138
 139     shortval = htons(raw->time_hi_and_version);
 140     memcpy(&uuid->data[6], &shortval, sizeof(uint16_t));
 141
 142     uuid->data[8] = raw->clock_seq_hi_and_reserved;
 143     uuid->data[9] = raw->clock_seq_low;
 144
 145     memcpy(&uuid->data[10], &raw->node, 6);
 146 }
 147
 148 void
 149 opr_uuid_unpack(const opr_uuid_t *uuid, struct opr_uuid_unpacked *raw)
 150 {
 151     afs_uint32 intval;
 152     unsigned short shortval;
 153
 154     memcpy(&intval, &uuid->data[0], sizeof(uint32_t));
 155     raw->time_low = ntohl(intval);
 156
 157     memcpy(&shortval, &uuid->data[4], sizeof(uint16_t));
 158     raw->time_mid = ntohs(shortval);
 159
 160     memcpy(&shortval, &uuid->data[6], sizeof(uint16_t));
 161     raw->time_hi_and_version = ntohs(shortval);
 162
 163     raw->clock_seq_hi_and_reserved = uuid->data[8];
 164     raw->clock_seq_low = uuid->data[9];
 165
 166     memcpy(&raw->node, &uuid->data[10], 6);
 167 }
 168