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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Host functions for verified boot.
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "2common.h"
#include "2sha.h"
#include "2sysincludes.h"
#include "host_common.h"
#include "host_misc2.h"
#include "vb21_common.h"
vb2_error_t vb2_read_file(const char *filename, uint8_t **data_ptr,
uint32_t *size_ptr)
{
FILE *f;
uint8_t *buf;
long size;
*data_ptr = NULL;
*size_ptr = 0;
f = fopen(filename, "rb");
if (!f) {
VB2_DEBUG("Unable to open file %s\n", filename);
return VB2_ERROR_READ_FILE_OPEN;
}
fseek(f, 0, SEEK_END);
size = ftell(f);
rewind(f);
if (size < 0 || size > UINT32_MAX) {
fclose(f);
return VB2_ERROR_READ_FILE_SIZE;
}
buf = malloc(size);
if (!buf) {
fclose(f);
return VB2_ERROR_READ_FILE_ALLOC;
}
if(1 != fread(buf, size, 1, f)) {
VB2_DEBUG("Unable to read file %s\n", filename);
fclose(f);
free(buf);
return VB2_ERROR_READ_FILE_DATA;
}
fclose(f);
*data_ptr = buf;
*size_ptr = size;
return VB2_SUCCESS;
}
vb2_error_t vb2_write_file(const char *filename, const void *buf, uint32_t size)
{
FILE *f = fopen(filename, "wb");
if (!f) {
VB2_DEBUG("Unable to open file %s\n", filename);
return VB2_ERROR_WRITE_FILE_OPEN;
}
if (1 != fwrite(buf, size, 1, f)) {
VB2_DEBUG("Unable to write to file %s\n", filename);
fclose(f);
unlink(filename); /* Delete any partial file */
return VB2_ERROR_WRITE_FILE_DATA;
}
fclose(f);
return VB2_SUCCESS;
}
vb2_error_t vb21_write_object(const char *filename, const void *buf)
{
const struct vb21_struct_common *cptr = buf;
return vb2_write_file(filename, buf, cptr->total_size);
}
uint32_t vb2_desc_size(const char *desc)
{
if (!desc || !*desc)
return 0;
return roundup32(strlen(desc) + 1);
}
static const char *onedigit(const char *str, uint8_t *vptr)
{
uint8_t val = 0;
char c;
for (; (c = *str++) && !isxdigit(c);)
;
if (!c)
return 0;
if (c >= '0' && c <= '9')
val = c - '0';
else if (c >= 'A' && c <= 'F')
val = 10 + c - 'A';
else if (c >= 'a' && c <= 'f')
val = 10 + c - 'a';
*vptr = val;
return str;
}
static const char *onebyte(const char *str, uint8_t *vptr)
{
uint8_t val;
uint8_t digit;
str = onedigit(str, &digit);
if (!str)
return 0;
val = digit << 4;
str = onedigit(str, &digit);
if (!str)
return 0;
val |= digit;
*vptr = val;
return str;
}
vb2_error_t vb2_str_to_id(const char *str, struct vb2_id *id)
{
uint8_t val = 0;
int i;
if (!str)
return VB2_ERROR_STR_TO_ID;
memset(id, 0, sizeof(*id));
for (i = 0; i < VB2_ID_NUM_BYTES; i++) {
str = onebyte(str, &val);
if (!str)
break;
id->raw[i] = val;
}
/* If we get at least one valid byte, that's good enough. */
return i ? VB2_SUCCESS : VB2_ERROR_STR_TO_ID;
}
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