blob: 6cf9fcc9ac87985c2590d688c5b1b30b0ca88969 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 The Chromium OS Authors.
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <asm/unaligned.h>
#include <linux/string.h>
#include <tpm-common.h>
#include "tpm-user-utils.h"
/**
* Print a byte string in hexdecimal format, 16-bytes per line.
*
* @param data byte string to be printed
* @param count number of bytes to be printed
*/
void print_byte_string(u8 *data, size_t count)
{
int i, print_newline = 0;
for (i = 0; i < count; i++) {
printf(" %02x", data[i]);
print_newline = (i % 16 == 15);
if (print_newline)
putc('\n');
}
/* Avoid duplicated newline at the end */
if (!print_newline)
putc('\n');
}
/**
* Convert a text string of hexdecimal values into a byte string.
*
* @param bytes text string of hexdecimal values with no space
* between them
* @param data output buffer for byte string. The caller has to make
* sure it is large enough for storing the output. If
* NULL is passed, a large enough buffer will be allocated,
* and the caller must free it.
* @param count_ptr output variable for the length of byte string
* @return pointer to output buffer
*/
void *parse_byte_string(char *bytes, u8 *data, size_t *count_ptr)
{
char byte[3];
size_t count, length;
int i;
if (!bytes)
return NULL;
length = strlen(bytes);
count = length / 2;
if (!data)
data = malloc(count);
if (!data)
return NULL;
byte[2] = '\0';
for (i = 0; i < length; i += 2) {
byte[0] = bytes[i];
byte[1] = bytes[i + 1];
data[i / 2] = (u8)simple_strtoul(byte, NULL, 16);
}
if (count_ptr)
*count_ptr = count;
return data;
}
/**
* report_return_code() - Report any error and return failure or success
*
* @param return_code TPM command return code
* @return value of enum command_ret_t
*/
int report_return_code(int return_code)
{
if (return_code) {
printf("Error: %d\n", return_code);
return CMD_RET_FAILURE;
} else {
return CMD_RET_SUCCESS;
}
}
/**
* Return number of values defined by a type string.
*
* @param type_str type string
* @return number of values of type string
*/
int type_string_get_num_values(const char *type_str)
{
return strlen(type_str);
}
/**
* Return total size of values defined by a type string.
*
* @param type_str type string
* @return total size of values of type string, or 0 if type string
* contains illegal type character.
*/
size_t type_string_get_space_size(const char *type_str)
{
size_t size;
for (size = 0; *type_str; type_str++) {
switch (*type_str) {
case 'b':
size += 1;
break;
case 'w':
size += 2;
break;
case 'd':
size += 4;
break;
default:
return 0;
}
}
return size;
}
/**
* Allocate a buffer large enough to hold values defined by a type
* string. The caller has to free the buffer.
*
* @param type_str type string
* @param count pointer for storing size of buffer
* @return pointer to buffer or NULL on error
*/
void *type_string_alloc(const char *type_str, u32 *count)
{
void *data;
size_t size;
size = type_string_get_space_size(type_str);
if (!size)
return NULL;
data = malloc(size);
if (data)
*count = size;
return data;
}
/**
* Pack values defined by a type string into a buffer. The buffer must have
* large enough space.
*
* @param type_str type string
* @param values text strings of values to be packed
* @param data output buffer of values
* @return 0 on success, non-0 on error
*/
int type_string_pack(const char *type_str, char * const values[],
u8 *data)
{
size_t offset;
u32 value;
for (offset = 0; *type_str; type_str++, values++) {
value = simple_strtoul(values[0], NULL, 0);
switch (*type_str) {
case 'b':
data[offset] = value;
offset += 1;
break;
case 'w':
put_unaligned_be16(value, data + offset);
offset += 2;
break;
case 'd':
put_unaligned_be32(value, data + offset);
offset += 4;
break;
default:
return -1;
}
}
return 0;
}
/**
* Read values defined by a type string from a buffer, and write these values
* to environment variables.
*
* @param type_str type string
* @param data input buffer of values
* @param vars names of environment variables
* @return 0 on success, non-0 on error
*/
int type_string_write_vars(const char *type_str, u8 *data,
char * const vars[])
{
size_t offset;
u32 value;
for (offset = 0; *type_str; type_str++, vars++) {
switch (*type_str) {
case 'b':
value = data[offset];
offset += 1;
break;
case 'w':
value = get_unaligned_be16(data + offset);
offset += 2;
break;
case 'd':
value = get_unaligned_be32(data + offset);
offset += 4;
break;
default:
return -1;
}
if (env_set_ulong(*vars, value))
return -1;
}
return 0;
}
int get_tpm(struct udevice **devp)
{
int rc;
rc = uclass_first_device_err(UCLASS_TPM, devp);
if (rc) {
printf("Could not find TPM (ret=%d)\n", rc);
return CMD_RET_FAILURE;
}
return 0;
}
int do_tpm_info(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
struct udevice *dev;
char buf[80];
int rc;
rc = get_tpm(&dev);
if (rc)
return rc;
rc = tpm_get_desc(dev, buf, sizeof(buf));
if (rc < 0) {
printf("Couldn't get TPM info (%d)\n", rc);
return CMD_RET_FAILURE;
}
printf("%s\n", buf);
return 0;
}
int do_tpm_init(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc != 1)
return CMD_RET_USAGE;
return report_return_code(tpm_init());
}
int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
cmd_tbl_t *tpm_commands, *cmd;
unsigned int size;
if (argc < 2)
return CMD_RET_USAGE;
tpm_commands = get_tpm_commands(&size);
cmd = find_cmd_tbl(argv[1], tpm_commands, size);
if (!cmd)
return CMD_RET_USAGE;
return cmd->cmd(cmdtp, flag, argc - 1, argv + 1);
}