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/*
* Copyright 2015 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.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "file_type.h"
#include "futility.h"
#include "gbb_header.h"
/* Human-readable strings */
static const char * const type_strings[] = {
"unknown",
"VbPublicKey",
"VbKeyBlock",
"VbFirmwarePreamble",
"GBB",
"Chrome OS BIOS image",
"Cr-48 Chrome OS BIOS image",
"VbKernelPreamble",
"raw firmware",
"raw kernel",
"chromiumos disk image",
"VbPrivateKey",
"vb21 public key",
"vb21 private key",
"RSA private key",
};
BUILD_ASSERT(ARRAY_SIZE(type_strings) == NUM_FILE_TYPES);
const char * const futil_file_type_str(enum futil_file_type type)
{
if ((int) type < 0 || type >= NUM_FILE_TYPES)
type = FILE_TYPE_UNKNOWN;
return type_strings[type];
}
/* Try these in order so we recognize the larger objects first */
enum futil_file_type (*recognizers[])(uint8_t *buf, uint32_t len) = {
&recognize_gpt,
&recognize_bios_image,
&recognize_gbb,
&recognize_vblock1,
&recognize_vb1_key,
&recognize_vb2_key,
&recognize_pem,
};
/* Try to figure out what we're looking at */
enum futil_file_type futil_file_type_buf(uint8_t *buf, uint32_t len)
{
enum futil_file_type type;
int i;
for (i = 0; i < ARRAY_SIZE(recognizers); i++) {
type = recognizers[i](buf, len);
if (type != FILE_TYPE_UNKNOWN)
return type;
}
return FILE_TYPE_UNKNOWN;
}
enum futil_file_err futil_file_type(const char *filename,
enum futil_file_type *type)
{
int ifd;
uint8_t *buf;
uint32_t buf_len;
struct stat sb;
enum futil_file_err err = FILE_ERR_NONE;
*type = FILE_TYPE_UNKNOWN;
ifd = open(filename, O_RDONLY);
if (ifd < 0) {
fprintf(stderr, "Can't open %s: %s\n",
filename, strerror(errno));
return FILE_ERR_OPEN;
}
if (0 != fstat(ifd, &sb)) {
fprintf(stderr, "Can't stat input file: %s\n",
strerror(errno));
return FILE_ERR_STAT;
}
if (S_ISREG(sb.st_mode) || S_ISBLK(sb.st_mode)) {
err = futil_map_file(ifd, MAP_RO, &buf, &buf_len);
if (err) {
close(ifd);
return err;
}
*type = futil_file_type_buf(buf, buf_len);
err = futil_unmap_file(ifd, MAP_RO, buf, buf_len);
if (err) {
close(ifd);
return err;
}
} else if (S_ISDIR(sb.st_mode)) {
err = FILE_ERR_DIR;
} else if (S_ISCHR(sb.st_mode)) {
err = FILE_ERR_CHR;
} else if (S_ISFIFO(sb.st_mode)) {
err = FILE_ERR_FIFO;
} else if (S_ISSOCK(sb.st_mode)) {
err = FILE_ERR_SOCK;
}
if (close(ifd)) {
fprintf(stderr, "Error when closing %s: %s\n",
filename, strerror(errno));
return FILE_ERR_CLOSE;
}
return err;
}
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