[U-Boot] [PATCH v5 4/6] new commands: uuid and guid - generate random unique identifier
Przemyslaw Marczak
p.marczak at samsung.com
Tue Apr 1 16:30:41 CEST 2014
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 at samsung.com>
Cc: Stephen Warren <swarren at nvidia.com>
Cc: Lukasz Majewski <l.majewski at samsung.com>
Cc: trini at ti.com
---
Changes v4:
- new commit
Changes v5:
- reword commands description
- uuid command code refactor
- remove use of typedef uuid_str_t
---
README | 2 +-
include/config_fallbacks.h | 14 ++++++++------
lib/uuid.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/README b/README
index 7cb7c4f..025386f 100644
--- a/README
+++ b/README
@@ -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:
diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
index f31a2f5..5eacfb6 100644
--- a/include/config_fallbacks.h
+++ b/include/config_fallbacks.h
@@ -56,15 +56,17 @@
#endif
#if (defined(CONFIG_PARTITION_UUIDS) || \
- defined(CONFIG_RANDOM_UUID) || \
- defined(CONFIG_BOOTP_PXE)) && \
- !defined(CONFIG_LIB_UUID)
+ 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
diff --git a/lib/uuid.c b/lib/uuid.c
index 44d0c93..f32b602 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -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
--
1.9.0
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