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new commands: uuid and guid - generate random unique identifier

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Those commands basis on implementation of random UUID generator version 4
which is described in RFC4122. The same algorithm is used for generation
both ids but string representation is different as below.

char:  0        9    14   19   24         36
       xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
UUID:     be     be   be   be       be
GUID:     le     le   le   be       be

Commands usage:
- uuid [<varname>]
- guid [<varname>]

The result is saved in environment as a "varname" variable if argument is given,
if not then it is printed.

New config:
- CONFIG_CMD_UUID

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: trini@ti.com
This commit is contained in:
Przemyslaw Marczak 2014-04-02 10:20:05 +02:00 committed by Tom Rini
parent 4e4815feae
commit 89c8230dec
3 changed files with 49 additions and 5 deletions
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2
README
View File

@ -1012,7 +1012,7 @@ The following options need to be configured:
CONFIG_CMD_CDP * Cisco Discover Protocol support
CONFIG_CMD_MFSL * Microblaze FSL support
CONFIG_CMD_XIMG Load part of Multi Image
CONFIG_CMD_UUID * Generate random UUID or GUID string
EXAMPLE: If you want all functions except of network
support you can write:

8
include/config_fallbacks.h
View File

@ -58,14 +58,16 @@
#if (defined(CONFIG_PARTITION_UUIDS) || \
defined(CONFIG_EFI_PARTITION) || \
defined(CONFIG_RANDOM_UUID) || \
defined(CONFIG_CMD_UUID) || \
defined(CONFIG_BOOTP_PXE)) && \
!defined(CONFIG_LIB_UUID)
#define CONFIG_LIB_UUID
#endif
#if defined(CONFIG_RANDOM_UUID) && \
!defined(CONFIG_LIB_RAND) && \
!defined(CONFIG_LIB_HW_RAND)
#if (defined(CONFIG_RANDOM_UUID) || \
defined(CONFIG_CMD_UUID)) && \
(!defined(CONFIG_LIB_RAND) && \
!defined(CONFIG_LIB_HW_RAND))
#define CONFIG_LIB_RAND
#endif

44
lib/uuid.c
View File

@ -4,6 +4,7 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/ctype.h>
#include <errno.h>
#include <common.h>
@ -171,7 +172,7 @@ void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format)
*
* @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
*/
#ifdef CONFIG_RANDOM_UUID
#if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID)
void gen_rand_uuid(unsigned char *uuid_bin)
{
struct uuid uuid;
@ -210,4 +211,45 @@ void gen_rand_uuid_str(char *uuid_str, int str_format)
/* Convert UUID bin to UUID or GUID formated STRING */
uuid_bin_to_str(uuid_bin, uuid_str, str_format);
}
#ifdef CONFIG_CMD_UUID
int do_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char uuid[UUID_STR_LEN + 1];
int str_format;
if (!strcmp(argv[0], "uuid"))
str_format = UUID_STR_FORMAT_STD;
else
str_format = UUID_STR_FORMAT_GUID;
if (argc > 2)
return CMD_RET_USAGE;
gen_rand_uuid_str(uuid, str_format);
if (argc == 1)
printf("%s\n", uuid);
else
setenv(argv[1], uuid);
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
"UUID - generate random Universally Unique Identifier",
"[<varname>]\n"
"Argument:\n"
"varname: for set result in a environment variable\n"
"e.g. uuid uuid_env"
);
U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
"GUID - generate Globally Unique Identifier based on random UUID",
"[<varname>]\n"
"Argument:\n"
"varname: for set result in a environment variable\n"
"e.g. guid guid_env"
);
#endif
#endif