/* grub-setup.c - make GRUB usable */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. * * GRUB is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _GNU_SOURCE 1 #include #define DEFAULT_BOOT_FILE "boot.img" #define DEFAULT_CORE_FILE "core.img" #ifdef __NetBSD__ /* NetBSD uses /boot for its boot block. */ # define DEFAULT_DIRECTORY "/grub" #else # define DEFAULT_DIRECTORY "/boot/grub" #endif #define DEFAULT_DEVICE_MAP DEFAULT_DIRECTORY "/device.map" /* This is the blocklist used in the diskboot image. */ struct boot_blocklist { grub_uint32_t start; grub_uint16_t len; grub_uint16_t segment; } __attribute__ ((packed)); void grub_putchar (int c) { putchar (c); } void grub_refresh (void) { } static void setup (const char *prefix, const char *dir, const char *boot_file, const char *core_file, const char *root, const char *dest) { char *boot_path, *core_path; char *boot_img, *core_img; size_t boot_size, core_size; grub_uint16_t core_sectors; grub_device_t root_dev, dest_dev; grub_uint8_t *boot_drive; grub_uint32_t *kernel_sector; struct boot_blocklist *first_block, *block; grub_int32_t *install_dos_part, *install_bsd_part; char *install_prefix; char *tmp_img; int i; unsigned long first_sector; grub_uint16_t current_segment = GRUB_BOOT_MACHINE_KERNEL_SEG + (GRUB_DISK_SECTOR_SIZE >> 4); grub_uint16_t last_length = GRUB_DISK_SECTOR_SIZE; grub_file_t file; FILE *fp; unsigned long first_start = ~0UL; auto void save_first_sector (unsigned long sector, unsigned offset, unsigned length); auto void save_blocklists (unsigned long sector, unsigned offset, unsigned length); auto int find_first_partition_start (const grub_partition_t p); int find_first_partition_start (const grub_partition_t p) { if (! grub_partition_is_empty (p->dos_type) && ! grub_partition_is_bsd (p->dos_type) && first_start > p->start) first_start = p->start; return 0; } void save_first_sector (unsigned long sector, unsigned offset, unsigned length) { grub_util_info ("the fist sector is <%lu,%u,%u>", sector, offset, length); if (offset != 0 || length != GRUB_DISK_SECTOR_SIZE) grub_util_error ("The first sector of the core file is not sector-aligned"); first_sector = sector; } void save_blocklists (unsigned long sector, unsigned offset, unsigned length) { struct boot_blocklist *prev = block + 1; grub_util_info ("saving <%lu,%u,%u> with the segment 0x%x", sector, offset, length, (unsigned) current_segment); if (offset != 0 || last_length != GRUB_DISK_SECTOR_SIZE) grub_util_error ("Non-sector-aligned data is found in the core file"); if (block != first_block && (grub_le_to_cpu32 (prev->start) + grub_le_to_cpu16 (prev->len)) == sector) prev->len = grub_cpu_to_le16 (grub_le_to_cpu16 (prev->len) + 1); else { block->start = grub_cpu_to_le32 (sector); block->len = grub_cpu_to_le16 (1); block->segment = grub_cpu_to_le16 (current_segment); block--; if (block->len) grub_util_error ("The sectors of the core file are too fragmented"); } last_length = length; current_segment += GRUB_DISK_SECTOR_SIZE >> 4; } /* Read the boot image by the OS service. */ boot_path = grub_util_get_path (dir, boot_file); boot_size = grub_util_get_image_size (boot_path); if (boot_size != GRUB_DISK_SECTOR_SIZE) grub_util_error ("The size of `%s' is not %d", boot_path, GRUB_DISK_SECTOR_SIZE); boot_img = grub_util_read_image (boot_path); free (boot_path); /* Set the addresses of BOOT_DRIVE and KERNEL_SECTOR. */ boot_drive = (grub_uint8_t *) (boot_img + GRUB_BOOT_MACHINE_BOOT_DRIVE); kernel_sector = (grub_uint32_t *) (boot_img + GRUB_BOOT_MACHINE_KERNEL_SECTOR); core_path = grub_util_get_path (dir, core_file); core_size = grub_util_get_image_size (core_path); core_sectors = ((core_size + GRUB_DISK_SECTOR_SIZE - 1) >> GRUB_DISK_SECTOR_BITS); if (core_size < GRUB_DISK_SECTOR_SIZE) grub_util_error ("The size of `%s' is too small", core_path); else if (core_size > 0xFFFF * GRUB_DISK_SECTOR_SIZE) grub_util_error ("The size of `%s' is too large", core_path); core_img = grub_util_read_image (core_path); free (core_path); /* Have FIRST_BLOCK to point to the first blocklist. */ first_block = (struct boot_blocklist *) (core_img + GRUB_DISK_SECTOR_SIZE - sizeof (*block)); install_dos_part = (grub_int32_t *) (core_img + GRUB_DISK_SECTOR_SIZE + GRUB_KERNEL_MACHINE_INSTALL_DOS_PART); install_bsd_part = (grub_int32_t *) (core_img + GRUB_DISK_SECTOR_SIZE + GRUB_KERNEL_MACHINE_INSTALL_BSD_PART); install_prefix = (core_img + GRUB_DISK_SECTOR_SIZE + GRUB_KERNEL_MACHINE_PREFIX); /* Open the root device and the destination device. */ root_dev = grub_device_open (root); if (! root_dev) grub_util_error ("%s", grub_errmsg); dest_dev = grub_device_open (dest); if (! dest_dev) grub_util_error ("%s", grub_errmsg); grub_util_info ("setting the root device to `%s'", root); if (grub_device_set_root (root) != GRUB_ERR_NONE) grub_util_error ("%s", grub_errmsg); /* Read the original sector from the disk. */ tmp_img = xmalloc (GRUB_DISK_SECTOR_SIZE); if (grub_disk_read (dest_dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE, tmp_img)) grub_util_error ("%s", grub_errmsg); /* Copy the possible DOS BPB. */ memcpy (boot_img + GRUB_BOOT_MACHINE_BPB_START, tmp_img + GRUB_BOOT_MACHINE_BPB_START, GRUB_BOOT_MACHINE_BPB_END - GRUB_BOOT_MACHINE_BPB_START); /* Copy the possible partition table. */ if (dest_dev->disk->has_partitions) memcpy (boot_img + GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC, tmp_img + GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC, GRUB_BOOT_MACHINE_PART_END - GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC); free (tmp_img); /* If the destination device can have partitions and it is the MBR, try to embed the core image into after the MBR. */ if (dest_dev->disk->has_partitions && ! dest_dev->disk->partition) { grub_partition_iterate (dest_dev->disk, find_first_partition_start); /* If there is enough space... */ if ((unsigned long) core_sectors + 1 <= first_start) { grub_util_info ("will embed the core image into after the MBR"); /* The first blocklist contains the whole sectors. */ first_block->start = grub_cpu_to_le32 (2); first_block->len = grub_cpu_to_le16 (core_sectors - 1); first_block->segment = grub_cpu_to_le16 (GRUB_BOOT_MACHINE_KERNEL_SEG + (GRUB_DISK_SECTOR_SIZE >> 4)); /* Make sure that the second blocklist is a terminator. */ block = first_block - 1; block->start = 0; block->len = 0; block->segment = 0; /* Embed information about the installed location. */ if (root_dev->disk->partition) { *install_dos_part = grub_cpu_to_le32 (root_dev->disk->partition->dos_part); *install_bsd_part = grub_cpu_to_le32 (root_dev->disk->partition->bsd_part); } else *install_dos_part = *install_bsd_part = grub_cpu_to_le32 (-1); strcpy (install_prefix, prefix); /* Write the core image onto the disk. */ if (grub_disk_write (dest_dev->disk, 1, 0, core_size, core_img)) grub_util_error ("%s", grub_errmsg); /* The boot image and the core image are on the same drive, so there is no need to specify the boot drive explicitly. */ *boot_drive = 0xff; *kernel_sector = grub_cpu_to_le32 (1); /* Write the boot image onto the disk. */ if (grub_disk_write (dest_dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE, boot_img)) grub_util_error ("%s", grub_errmsg); goto finish; } } /* The core image must be put on a filesystem unfortunately. */ grub_util_info ("will leave the core image on the filesystem"); /* Make sure that GRUB reads the identical image as the OS. */ tmp_img = xmalloc (core_size); core_path = grub_util_get_path (prefix, core_file); /* It is a Good Thing to sync two times. */ sync (); sync (); #define MAX_TRIES 5 for (i = 0; i < MAX_TRIES; i++) { grub_util_info ("attempting to read the core image `%s' from GRUB%s", core_path, (i == 0) ? "" : " again"); grub_disk_cache_invalidate_all (); file = grub_file_open (core_path); if (file) { if (grub_file_size (file) != (grub_ssize_t) core_size) grub_util_info ("succeeded in opening the core image but the size is different (%d != %d)", (int) grub_file_size (file), (int) core_size); else if (grub_file_read (file, tmp_img, core_size) != (grub_ssize_t) core_size) grub_util_info ("succeeded in opening the core image but cannot read %d bytes", (int) core_size); else if (memcmp (core_img, tmp_img, core_size) != 0) { #if 0 FILE *dump; FILE *dump2; dump = fopen ("dump.img", "wb"); if (dump) { fwrite (tmp_img, 1, core_size, dump); fclose (dump); } dump2 = fopen ("dump2.img", "wb"); if (dump2) { fwrite (core_img, 1, core_size, dump2); fclose (dump2); } #endif grub_util_info ("succeeded in opening the core image but the data is different"); } else { grub_file_close (file); break; } grub_file_close (file); } else grub_util_info ("couldn't open the core image"); if (grub_errno) grub_util_info ("error message = %s", grub_errmsg); grub_errno = GRUB_ERR_NONE; sync (); sleep (1); } if (i == MAX_TRIES) grub_util_error ("Cannot read `%s' correctly", core_path); /* Clean out the blocklists. */ block = first_block; while (block->len) { block->start = 0; block->len = 0; block->segment = 0; block--; if ((char *) block <= core_img) grub_util_error ("No terminator in the core image"); } /* Now read the core image to determine where the sectors are. */ file = grub_file_open (core_path); if (! file) grub_util_error ("%s", grub_errmsg); file->read_hook = save_first_sector; if (grub_file_read (file, tmp_img, GRUB_DISK_SECTOR_SIZE) != GRUB_DISK_SECTOR_SIZE) grub_util_error ("Failed to read the first sector of the core image"); block = first_block; file->read_hook = save_blocklists; if (grub_file_read (file, tmp_img, core_size - GRUB_DISK_SECTOR_SIZE) != (grub_ssize_t) core_size - GRUB_DISK_SECTOR_SIZE) grub_util_error ("Failed to read the rest sectors of the core image"); free (core_path); free (tmp_img); *kernel_sector = grub_cpu_to_le32 (first_sector); /* If the destination device is different from the root device, it is necessary to embed the boot drive explicitly. */ if (root_dev->disk->id != dest_dev->disk->id) *boot_drive = (grub_uint8_t) root_dev->disk->id; else *boot_drive = 0xFF; /* Embed information about the installed location. */ if (root_dev->disk->partition) { *install_dos_part = grub_cpu_to_le32 (root_dev->disk->partition->dos_part); *install_bsd_part = grub_cpu_to_le32 (root_dev->disk->partition->bsd_part); } else *install_dos_part = *install_bsd_part = grub_cpu_to_le32 (-1); strcpy (install_prefix, prefix); /* Write the first two sectors of the core image onto the disk. */ core_path = grub_util_get_path (dir, core_file); grub_util_info ("opening the core image `%s'", core_path); fp = fopen (core_path, "r+b"); if (! fp) grub_util_error ("Cannot open `%s'", core_path); grub_util_write_image (core_img, GRUB_DISK_SECTOR_SIZE * 2, fp); fclose (fp); free (core_path); /* Write the boot image onto the disk. */ if (grub_disk_write (dest_dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE, boot_img)) grub_util_error ("%s", grub_errmsg); finish: /* Sync is a Good Thing. */ sync (); free (core_img); free (boot_img); grub_device_close (dest_dev); grub_device_close (root_dev); } static struct option options[] = { {"boot-image", required_argument, 0, 'b'}, {"core-image", required_argument, 0, 'c'}, {"directory", required_argument, 0, 'd'}, {"device-map", required_argument, 0, 'm'}, {"root-device", required_argument, 0, 'r'}, {"help", no_argument, 0, 'h'}, {"version", no_argument, 0, 'V'}, {"verbose", no_argument, 0, 'v'}, {0, 0, 0, 0} }; static void usage (int status) { if (status) fprintf (stderr, "Try ``grub-setup --help'' for more information.\n"); else printf ("\ Usage: grub-setup [OPTION]... DEVICE\n\ \n\ Set up images to boot from DEVICE.\n\ DEVICE must be a GRUB device (e.g. ``(hd0,0)'').\n\ \n\ -b, --boot-file=FILE use FILE as the boot file [default=%s]\n\ -c, --core-file=FILE use FILE as the core file [default=%s]\n\ -d, --directory=DIR use GRUB files in the directory DIR [default=%s]\n\ -m, --device-map=FILE use FILE as the device map [default=%s]\n\ -r, --root-device=DEV use DEV as the root device [default=guessed]\n\ -h, --help display this message and exit\n\ -V, --version print version information and exit\n\ -v, --verbose print verbose messages\n\ \n\ Report bugs to <%s>.\n\ ", DEFAULT_BOOT_FILE, DEFAULT_CORE_FILE, DEFAULT_DIRECTORY, DEFAULT_DEVICE_MAP, PACKAGE_BUGREPORT); exit (status); } static char * get_device_name (char *dev) { size_t len = strlen (dev); if (dev[0] != '(' || dev[len - 1] != ')') return 0; dev[len - 1] = '\0'; return dev + 1; } int main (int argc, char *argv[]) { char *boot_file = 0; char *core_file = 0; char *dir = 0; char *dev_map = 0; char *root_dev = 0; char *prefix; char *dest_dev; progname = "grub-setup"; /* Check for options. */ while (1) { int c = getopt_long (argc, argv, "b:c:d:m:r:hVv", options, 0); if (c == -1) break; else switch (c) { case 'b': if (boot_file) free (boot_file); boot_file = xstrdup (optarg); break; case 'c': if (core_file) free (core_file); core_file = xstrdup (optarg); break; case 'd': if (dir) free (dir); dir = xstrdup (optarg); break; case 'm': if (dev_map) free (dev_map); dev_map = xstrdup (optarg); break; case 'r': if (root_dev) free (root_dev); root_dev = xstrdup (optarg); break; case 'h': usage (0); break; case 'V': printf ("grub-setup (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION); return 0; case 'v': verbosity++; break; default: usage (1); break; } } /* Obtain DEST_DEV. */ if (optind >= argc) { fprintf (stderr, "No device is specified.\n"); usage (1); } if (optind + 1 != argc) { fprintf (stderr, "Unknown extra argument `%s'.\n", argv[optind + 1]); usage (1); } dest_dev = get_device_name (argv[optind]); if (! dest_dev) { fprintf (stderr, "Invalid device `%s'.\n", argv[optind]); usage (1); } prefix = grub_get_prefix (dir ? : DEFAULT_DIRECTORY); /* Initialize the emulated biosdisk driver. */ grub_util_biosdisk_init (dev_map ? : DEFAULT_DEVICE_MAP); /* Initialize filesystems. */ grub_fat_init (); grub_ext2_init (); if (root_dev) { char *tmp = get_device_name (root_dev); if (! tmp) grub_util_error ("Invalid root device `%s'", root_dev); tmp = xstrdup (tmp); free (root_dev); root_dev = tmp; } else { root_dev = grub_guess_root_device (dir ? : DEFAULT_DIRECTORY); if (! root_dev) { grub_util_info ("guessing the root device failed, because of `%s'", grub_errmsg); grub_util_error ("Cannot guess the root device. Specify the option ``--root-device''."); } } /* Do the real work. */ setup (prefix, dir ? : DEFAULT_DIRECTORY, boot_file ? : DEFAULT_BOOT_FILE, core_file ? : DEFAULT_CORE_FILE, root_dev, dest_dev); /* Free resources. */ grub_ext2_fini (); grub_fat_fini (); grub_util_biosdisk_fini (); free (boot_file); free (core_file); free (prefix); free (dir); free (dev_map); free (root_dev); free (prefix); return 0; }