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160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/******************************************************************************
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* vtoyfat.c ---- Parse fat file system
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*
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* Copyright (c) 2021, longpanda <admin@ventoy.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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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 <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <fat_filelib.h>
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static int g_disk_fd = 0;
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static int vtoy_disk_read(uint32 sector, uint8 *buffer, uint32 sector_count)
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{
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lseek(g_disk_fd, sector * 512, SEEK_SET);
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read(g_disk_fd, buffer, sector_count * 512);
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return 1;
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}
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static int check_secure_boot(void)
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{
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void *flfile = NULL;
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flfile = fl_fopen("/EFI/BOOT/grubx64_real.efi", "rb");
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if (flfile)
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{
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fl_fclose(flfile);
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return 0;
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}
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return 1;
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}
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static int get_ventoy_version(void)
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{
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int rc = 1;
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int size = 0;
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char *buf = NULL;
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char *pos = NULL;
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char *end = NULL;
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void *flfile = NULL;
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flfile = fl_fopen("/grub/grub.cfg", "rb");
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if (flfile)
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{
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fl_fseek(flfile, 0, SEEK_END);
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size = (int)fl_ftell(flfile);
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fl_fseek(flfile, 0, SEEK_SET);
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buf = malloc(size + 1);
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if (buf)
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{
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fl_fread(buf, 1, size, flfile);
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buf[size] = 0;
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pos = strstr(buf, "VENTOY_VERSION=");
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if (pos)
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{
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pos += strlen("VENTOY_VERSION=");
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if (*pos == '"')
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{
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pos++;
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}
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end = pos;
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while (*end != 0 && *end != '"' && *end != '\r' && *end != '\n')
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{
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end++;
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}
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*end = 0;
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printf("%s\n", pos);
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rc = 0;
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}
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free(buf);
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}
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fl_fclose(flfile);
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}
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return rc;
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}
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int vtoyfat_main(int argc, char **argv)
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{
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int op = 0;
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int rc = 1;
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char *disk;
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if (argc != 2 && argc != 3)
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{
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printf("Usage: vtoyfat /dev/sdbs \n");
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printf("Usage: vtoyfat -s /dev/sdbs \n");
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return 1;
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}
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if (argv[1][0] == '-' && argv[1][1] == 'T')
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{
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return 0;
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}
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disk = argv[1];
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if (argv[1][0] == '-' && argv[1][1] == 's')
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{
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op = 1;
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disk = argv[2];
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}
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g_disk_fd = open(disk, O_RDONLY);
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if (g_disk_fd < 0)
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{
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printf("Failed to open %s\n", disk);
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return 1;
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}
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fl_init();
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if (0 == fl_attach_media(vtoy_disk_read, NULL))
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{
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if (op == 0)
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{
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rc = get_ventoy_version();
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}
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else
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{
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rc = check_secure_boot();
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}
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}
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fl_shutdown();
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close(g_disk_fd);
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return rc;
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}
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