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