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gpt.c
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gpt.c
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/*
* cmd_gpt.c -- GPT (GUID Partition Table) handling command
*
* Copyright (C) 2015
* Lukasz Majewski <[email protected]>
*
* Copyright (C) 2012 Samsung Electronics
* author: Lukasz Majewski <[email protected]>
* author: Piotr Wilczek <[email protected]>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <malloc.h>
#include <command.h>
#include <part_efi.h>
#include <exports.h>
#include <linux/ctype.h>
#include <div64.h>
#include <memalign.h>
#ifndef CONFIG_PARTITION_UUIDS
#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
#endif
/**
* extract_env(): Expand env name from string format '&{env_name}'
* and return pointer to the env (if the env is set)
*
* @param str - pointer to string
* @param env - pointer to pointer to extracted env
*
* @return - zero on successful expand and env is set
*/
static int extract_env(const char *str, char **env)
{
int ret = -1;
char *e, *s;
#ifdef CONFIG_RANDOM_UUID
char uuid_str[UUID_STR_LEN + 1];
#endif
if (!str || strlen(str) < 4)
return -1;
if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
return -1;
s = strdup(str);
if (s == NULL)
return -1;
memset(s + strlen(s) - 1, '\0', 1);
memmove(s, s + 2, strlen(s) - 1);
e = getenv(s);
if (e == NULL) {
#ifdef CONFIG_RANDOM_UUID
debug("%s unset. ", str);
gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
setenv(s, uuid_str);
e = getenv(s);
if (e) {
debug("Set to random.\n");
ret = 0;
} else {
debug("Can't get random UUID.\n");
}
#else
debug("%s unset.\n", str);
#endif
} else {
debug("%s get from environment.\n", str);
ret = 0;
}
*env = e;
free(s);
return ret;
}
/**
* extract_val(): Extract value from a key=value pair list (comma separated).
* Only value for the given key is returend.
* Function allocates memory for the value, remember to free!
*
* @param str - pointer to string with key=values pairs
* @param key - pointer to the key to search for
*
* @return - pointer to allocated string with the value
*/
static char *extract_val(const char *str, const char *key)
{
char *v, *k;
char *s, *strcopy;
char *new = NULL;
strcopy = strdup(str);
if (strcopy == NULL)
return NULL;
s = strcopy;
while (s) {
v = strsep(&s, ",");
if (!v)
break;
k = strsep(&v, "=");
if (!k)
break;
if (strcmp(k, key) == 0) {
new = strdup(v);
break;
}
}
free(strcopy);
return new;
}
/**
* found_key(): Found key without value in parameter list (comma separated).
*
* @param str - pointer to string with key
* @param key - pointer to the key to search for
*
* @return - true on found key
*/
static bool found_key(const char *str, const char *key)
{
char *k;
char *s, *strcopy;
bool result = false;
strcopy = strdup(str);
if (!strcopy)
return NULL;
s = strcopy;
while (s) {
k = strsep(&s, ",");
if (!k)
break;
if (strcmp(k, key) == 0) {
result = true;
break;
}
}
free(strcopy);
return result;
}
/**
* set_gpt_info(): Fill partition information from string
* function allocates memory, remember to free!
*
* @param dev_desc - pointer block device descriptor
* @param str_part - pointer to string with partition information
* @param str_disk_guid - pointer to pointer to allocated string with disk guid
* @param partitions - pointer to pointer to allocated partitions array
* @param parts_count - number of partitions
*
* @return - zero on success, otherwise error
*
*/
static int set_gpt_info(struct blk_desc *dev_desc,
const char *str_part,
char **str_disk_guid,
disk_partition_t **partitions,
u8 *parts_count)
{
char *tok, *str, *s;
int i;
char *val, *p;
int p_count;
disk_partition_t *parts;
int errno = 0;
uint64_t size_ll, start_ll;
lbaint_t offset = 0;
debug("%s: lba num: 0x%x %d\n", __func__,
(unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
if (str_part == NULL)
return -1;
str = strdup(str_part);
/* extract disk guid */
s = str;
val = extract_val(str, "uuid_disk");
if (!val) {
#ifdef CONFIG_RANDOM_UUID
*str_disk_guid = malloc(UUID_STR_LEN + 1);
gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
#else
free(str);
return -2;
#endif
} else {
val = strsep(&val, ";");
if (extract_env(val, &p))
p = val;
*str_disk_guid = strdup(p);
free(val);
/* Move s to first partition */
strsep(&s, ";");
}
if (strlen(s) == 0)
return -3;
i = strlen(s) - 1;
if (s[i] == ';')
s[i] = '\0';
/* calculate expected number of partitions */
p_count = 1;
p = s;
while (*p) {
if (*p++ == ';')
p_count++;
}
/* allocate memory for partitions */
parts = calloc(sizeof(disk_partition_t), p_count);
/* retrieve partitions data from string */
for (i = 0; i < p_count; i++) {
tok = strsep(&s, ";");
if (tok == NULL)
break;
/* uuid */
val = extract_val(tok, "uuid");
if (!val) {
/* 'uuid' is optional if random uuid's are enabled */
#ifdef CONFIG_RANDOM_UUID
gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
#else
errno = -4;
goto err;
#endif
} else {
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].uuid)) {
printf("Wrong uuid format for partition %d\n", i);
errno = -4;
goto err;
}
strcpy((char *)parts[i].uuid, p);
free(val);
}
#ifdef CONFIG_PARTITION_TYPE_GUID
/* guid */
val = extract_val(tok, "type");
if (val) {
/* 'type' is optional */
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].type_guid)) {
printf("Wrong type guid format for partition %d\n",
i);
errno = -4;
goto err;
}
strcpy((char *)parts[i].type_guid, p);
free(val);
}
#endif
/* name */
val = extract_val(tok, "name");
if (!val) { /* name is mandatory */
errno = -4;
goto err;
}
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].name)) {
errno = -4;
goto err;
}
strcpy((char *)parts[i].name, p);
free(val);
/* size */
val = extract_val(tok, "size");
if (!val) { /* 'size' is mandatory */
errno = -4;
goto err;
}
if (extract_env(val, &p))
p = val;
if ((strcmp(p, "-") == 0)) {
/* Let part efi module to auto extend the size */
parts[i].size = 0;
} else {
size_ll = ustrtoull(p, &p, 0);
parts[i].size = lldiv(size_ll, dev_desc->blksz);
}
free(val);
/* start address */
val = extract_val(tok, "start");
if (val) { /* start address is optional */
if (extract_env(val, &p))
p = val;
start_ll = ustrtoull(p, &p, 0);
parts[i].start = lldiv(start_ll, dev_desc->blksz);
free(val);
}
offset += parts[i].size + parts[i].start;
/* bootable */
if (found_key(tok, "bootable"))
parts[i].bootable = 1;
}
*parts_count = p_count;
*partitions = parts;
free(str);
return 0;
err:
free(str);
free(*str_disk_guid);
free(parts);
return errno;
}
static int gpt_default(struct blk_desc *blk_dev_desc, const char *str_part)
{
int ret;
char *str_disk_guid;
u8 part_count = 0;
disk_partition_t *partitions = NULL;
/* fill partitions */
ret = set_gpt_info(blk_dev_desc, str_part,
&str_disk_guid, &partitions, &part_count);
if (ret) {
if (ret == -1)
printf("No partition list provided\n");
if (ret == -2)
printf("Missing disk guid\n");
if ((ret == -3) || (ret == -4))
printf("Partition list incomplete\n");
return -1;
}
/* save partitions layout to disk */
ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
free(str_disk_guid);
free(partitions);
return ret;
}
static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
{
ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1,
blk_dev_desc->blksz);
disk_partition_t *partitions = NULL;
gpt_entry *gpt_pte = NULL;
char *str_disk_guid;
u8 part_count = 0;
int ret = 0;
/* fill partitions */
ret = set_gpt_info(blk_dev_desc, str_part,
&str_disk_guid, &partitions, &part_count);
if (ret) {
if (ret == -1) {
printf("No partition list provided - only basic check\n");
ret = gpt_verify_headers(blk_dev_desc, gpt_head,
&gpt_pte);
goto out;
}
if (ret == -2)
printf("Missing disk guid\n");
if ((ret == -3) || (ret == -4))
printf("Partition list incomplete\n");
return -1;
}
/* Check partition layout with provided pattern */
ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
gpt_head, &gpt_pte);
free(str_disk_guid);
free(partitions);
out:
free(gpt_pte);
return ret;
}
/**
* do_gpt(): Perform GPT operations
*
* @param cmdtp - command name
* @param flag
* @param argc
* @param argv
*
* @return zero on success; otherwise error
*/
static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int ret = CMD_RET_SUCCESS;
int dev = 0;
char *ep;
struct blk_desc *blk_dev_desc = NULL;
if (argc < 4 || argc > 5)
return CMD_RET_USAGE;
dev = (int)simple_strtoul(argv[3], &ep, 10);
if (!ep || ep[0] != '\0') {
printf("'%s' is not a number\n", argv[3]);
return CMD_RET_USAGE;
}
blk_dev_desc = blk_get_dev(argv[2], dev);
if (!blk_dev_desc) {
printf("%s: %s dev %d NOT available\n",
__func__, argv[2], dev);
return CMD_RET_FAILURE;
}
if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
printf("Writing GPT: ");
ret = gpt_default(blk_dev_desc, argv[4]);
} else if ((strcmp(argv[1], "verify") == 0)) {
ret = gpt_verify(blk_dev_desc, argv[4]);
printf("Verify GPT: ");
} else {
return CMD_RET_USAGE;
}
if (ret) {
printf("error!\n");
return CMD_RET_FAILURE;
}
printf("success!\n");
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
"GUID Partition Table",
"<command> <interface> <dev> <partitions_list>\n"
" - GUID partition table restoration and validity check\n"
" Restore or verify GPT information on a device connected\n"
" to interface\n"
" Example usage:\n"
" gpt write mmc 0 $partitions\n"
" gpt verify mmc 0 $partitions\n"
);