| /* |
| * Copyright 2011 Calxeda, Inc. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <linux/ctype.h> |
| #include <errno.h> |
| #include <common.h> |
| #include <asm/io.h> |
| #include <part_efi.h> |
| #include <malloc.h> |
| #include <uuid.h> |
| #define CONFIG_PARTITION_TYPE_GUID |
| #define CONFIG_RANDOM_UUID |
| #define CONFIG_CMD_UUID |
| /* |
| * UUID - Universally Unique IDentifier - 128 bits unique number. |
| * There are 5 versions and one variant of UUID defined by RFC4122 |
| * specification. A UUID contains a set of fields. The set varies |
| * depending on the version of the UUID, as shown below: |
| * - time, MAC address(v1), |
| * - user ID(v2), |
| * - MD5 of name or URL(v3), |
| * - random data(v4), |
| * - SHA-1 of name or URL(v5), |
| * |
| * Layout of UUID: |
| * timestamp - 60-bit: time_low, time_mid, time_hi_and_version |
| * version - 4 bit (bit 4 through 7 of the time_hi_and_version) |
| * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low |
| * variant: - bit 6 and 7 of clock_seq_hi_and_reserved |
| * node - 48 bit |
| * |
| * source: https://www.ietf.org/rfc/rfc4122.txt |
| * |
| * UUID binary format (16 bytes): |
| * |
| * 4B-2B-2B-2B-6B (big endian - network byte order) |
| * |
| * UUID string is 36 length of characters (36 bytes): |
| * |
| * 0 9 14 19 24 |
| * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx |
| * be be be be be |
| * |
| * where x is a hexadecimal character. Fields are separated by '-'s. |
| * When converting to a binary UUID, le means the field should be converted |
| * to little endian and be means it should be converted to big endian. |
| * |
| * UUID is also used as GUID (Globally Unique Identifier) with the same binary |
| * format but it differs in string format like below. |
| * |
| * GUID: |
| * 0 9 14 19 24 |
| * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx |
| * le le le be be |
| * |
| * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id. |
| */ |
| int uuid_str_valid(const char *uuid) |
| { |
| int i, valid; |
| |
| if (uuid == NULL) |
| return 0; |
| |
| for (i = 0, valid = 1; uuid[i] && valid; i++) { |
| switch (i) { |
| case 8: case 13: case 18: case 23: |
| valid = (uuid[i] == '-'); |
| break; |
| default: |
| valid = isxdigit(uuid[i]); |
| break; |
| } |
| } |
| |
| if (i != UUID_STR_LEN || !valid) |
| return 0; |
| |
| return 1; |
| } |
| |
| #ifdef CONFIG_PARTITION_TYPE_GUID |
| |
| // Due to a compiler bug, the GUID macros are not considered constant. |
| #define LIST_GUID \ |
| struct { \ |
| const char *string; \ |
| efi_guid_t guid; \ |
| } list_guid[] = { { "system", PARTITION_SYSTEM_GUID }, \ |
| { "mbr", LEGACY_MBR_PARTITION_GUID }, \ |
| { "msft", PARTITION_MSFT_RESERVED_GUID }, \ |
| { "data", PARTITION_BASIC_DATA_GUID }, \ |
| { "linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID }, \ |
| { "raid", PARTITION_LINUX_RAID_GUID }, \ |
| { "swap", PARTITION_LINUX_SWAP_GUID }, \ |
| { "lvm", PARTITION_LINUX_LVM_GUID } } |
| |
| /* |
| * uuid_guid_get_bin() - this function get GUID bin for string |
| * |
| * @param guid_str - pointer to partition type string |
| * @param guid_bin - pointer to allocated array for big endian output [16B] |
| */ |
| int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin) |
| { |
| LIST_GUID; |
| |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(list_guid); i++) { |
| if (!strcmp(list_guid[i].string, guid_str)) { |
| memcpy(guid_bin, &list_guid[i].guid, 16); |
| return 0; |
| } |
| } |
| return -ENODEV; |
| } |
| |
| /* |
| * uuid_guid_get_str() - this function get string for GUID. |
| * |
| * @param guid_bin - pointer to string with partition type guid [16B] |
| * @param guid_str - pointer to allocated partition type string [7B] |
| */ |
| int uuid_guid_get_str(unsigned char *guid_bin, char *guid_str) |
| { |
| LIST_GUID; |
| |
| int i; |
| |
| *guid_str = 0; |
| for (i = 0; i < ARRAY_SIZE(list_guid); i++) { |
| if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) { |
| strcpy(guid_str, list_guid[i].string); |
| return 0; |
| } |
| } |
| return -ENODEV; |
| } |
| #endif |
| |
| /* |
| * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data. |
| * |
| * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut |
| * @param uuid_bin - pointer to allocated array for big endian output [16B] |
| * @str_format - UUID string format: 0 - UUID; 1 - GUID |
| */ |
| int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format) |
| { |
| uint16_t tmp16; |
| uint32_t tmp32; |
| uint64_t tmp64; |
| |
| if (!uuid_str_valid(uuid_str)) { |
| #ifdef CONFIG_PARTITION_TYPE_GUID |
| if (!uuid_guid_get_bin(uuid_str, uuid_bin)) |
| return 0; |
| #endif |
| return -EINVAL; |
| } |
| |
| if (str_format == UUID_STR_FORMAT_STD) { |
| tmp32 = cpu_to_be32(simple_strtoul(uuid_str, NULL, 16)); |
| memcpy(uuid_bin, &tmp32, 4); |
| |
| tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 9, NULL, 16)); |
| memcpy(uuid_bin + 4, &tmp16, 2); |
| |
| tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 14, NULL, 16)); |
| memcpy(uuid_bin + 6, &tmp16, 2); |
| } else { |
| tmp32 = cpu_to_le32(simple_strtoul(uuid_str, NULL, 16)); |
| memcpy(uuid_bin, &tmp32, 4); |
| |
| tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 9, NULL, 16)); |
| memcpy(uuid_bin + 4, &tmp16, 2); |
| |
| tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 14, NULL, 16)); |
| memcpy(uuid_bin + 6, &tmp16, 2); |
| } |
| |
| tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 19, NULL, 16)); |
| memcpy(uuid_bin + 8, &tmp16, 2); |
| |
| tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16)); |
| memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6); |
| |
| return 0; |
| } |
| |
| /* |
| * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID. |
| * |
| * @param uuid_bin - pointer to binary data of UUID (big endian) [16B] |
| * @param uuid_str - pointer to allocated array for output string [37B] |
| * @str_format - UUID string format: 0 - UUID; 1 - GUID |
| */ |
| void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format) |
| { |
| const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8, |
| 9, 10, 11, 12, 13, 14, 15}; |
| const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8, |
| 9, 10, 11, 12, 13, 14, 15}; |
| const u8 *char_order; |
| int i; |
| |
| /* |
| * UUID and GUID bin data - always in big endian: |
| * 4B-2B-2B-2B-6B |
| * be be be be be |
| */ |
| if (str_format == UUID_STR_FORMAT_STD) |
| char_order = uuid_char_order; |
| else |
| char_order = guid_char_order; |
| |
| for (i = 0; i < 16; i++) { |
| sprintf(uuid_str, "%02x", uuid_bin[char_order[i]]); |
| uuid_str += 2; |
| switch (i) { |
| case 3: |
| case 5: |
| case 7: |
| case 9: |
| *uuid_str++ = '-'; |
| break; |
| } |
| } |
| } |
| |
| /* |
| * gen_rand_uuid() - this function generates a random binary UUID version 4. |
| * In this version all fields beside 4 bits of version and |
| * 2 bits of variant are randomly generated. |
| * |
| * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian. |
| */ |
| #if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID) |
| void gen_rand_uuid(unsigned char *uuid_bin) |
| { |
| struct uuid uuid; |
| unsigned int *ptr = (unsigned int *)&uuid; |
| int i; |
| |
| /* Set all fields randomly */ |
| for (i = 0; i < sizeof(struct uuid) / sizeof(*ptr); i++) |
| *(ptr + i) = cpu_to_be32(rand()); |
| |
| clrsetbits_be16(&uuid.time_hi_and_version, |
| UUID_VERSION_MASK, |
| UUID_VERSION << UUID_VERSION_SHIFT); |
| |
| clrsetbits_8(&uuid.clock_seq_hi_and_reserved, |
| UUID_VARIANT_MASK, |
| UUID_VARIANT << UUID_VARIANT_SHIFT); |
| |
| memcpy(uuid_bin, &uuid, sizeof(struct uuid)); |
| } |
| |
| /* |
| * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string |
| * formats UUID or GUID. |
| * |
| * @param uuid_str - pointer to allocated array [37B]. |
| * @param - uuid output type: UUID - 0, GUID - 1 |
| */ |
| void gen_rand_uuid_str(char *uuid_str, int str_format) |
| { |
| unsigned char uuid_bin[UUID_BIN_LEN]; |
| |
| /* Generate UUID (big endian) */ |
| gen_rand_uuid(uuid_bin); |
| |
| /* 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 /* CONFIG_CMD_UUID */ |
| #endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */ |