Identify bootloaders installed in the PBR of a partition

[gert]

Bytes 0x80 to 0x83 are used to identify different bootloaders installed in the PBR of a partition.

This is code from boot_info_script:

  case ${Bytes80_to_81} in
	0069) BST='ISOhybrid (Syslinux 3.72-3.73)';;
	010f) BST='HP Recovery';;
	019d) BST='BSD4.4: FAT32';;
	0211) BST='Dell Utility: FAT16';;
	0488) BST="Grub2's core.img";;
	0689) BST='Syslinux 3.00-3.52';
	      syslinux_info ${part};
	      BSI="${BSI} ${Syslinux_Msg}";;
	0734) BST='Dos_1.0';;
	0745) BST='Vista: FAT32';;
	089e) BST='MSDOS5.0: FAT16';;
	08cd) BST='Windows XP';;
	0b60) BST='Dell Utility: FAT16';; 
	0bd0) BST='MSWIN4.1: FAT32';;
	0e00) BST='Dell Utility: FAT16';;
	0fb6) BST='ISOhybrid with partition support (Syslinux 3.82-3.86)';;
	2a00) BST='ReactOS';;
	2d5e) BST='Dos 1.1';;
	31c0) BST='Syslinux 4.03 or higher';
	      syslinux_info ${part} '4.03';
	      BSI="${BSI} ${Syslinux_Msg}";;
	31d2) BST="Grub2's core.img";;
	3a5e) BST='Recovery: FAT32';;
	407c) BST='ISOhybrid (Syslinux 3.82-4.04)';;
	4216) BST='Grub4Dos: NTFS';;
	4445) BST='Dell Restore: FAT32';;
	55aa) case ${Bytes80_to_83} in
		55aa750a) BST='Grub4Dos: FAT32';;
		55aa*   ) BST='Windows Vista/7';;
	      esac;;
	55cd) BST='FAT32';;
	5626) BST='Grub4Dos: EXT2/3/4';;
	638b) BST='Freedos: FAT32';;
	6616) BST='FAT16';;
	696e) BST='FAT16';;
	6974) BST='BootIt: FAT16';;
	6f65) BST='BootIt: FAT16';;
	6f6e) BST='-';;		# 'MSWIN4.1: Fat 32'
	6f74) BST='FAT32';; 
	7815) case ${Bytes80_to_83} in
		7815b106) BST='Syslinux 3.53-3.86';
			  syslinux_info ${part};
			  BSI="${BSI} ${Syslinux_Msg}";;
		7815*   ) BST='FAT32';;
	      esac;;
	7cc6) BST='MSWIN4.1: FAT32';;
      # 7cc6) BST='Win_98';;
	7e1e) BST='Grub4Dos: FAT12/16';;
	8a56) BST='Acronis SZ: FAT32';;
	83e1) BST='ISOhybrid with partition support (Syslinux 4.00-4.04)';;
	8ec0) BST='Windows XP';;
	8ed0) BST='Dell Recovery: FAT32';;
	b106) BST='Syslinux 4.00-4.02';
	      syslinux_info ${part};
	      BSI="${BSI} ${Syslinux_Msg}";;
	b600) BST='Dell Utility: FAT16';;
	b6c6) BST='ISOhybrid with partition support (Syslinux 3.81)';;
	b6d1) BST='Windows XP: FAT32';;
	e2f7) BST='FAT32, Non Bootable';;
	e879) BST='ISOhybrid (Syslinux 3.74-3.80)';;
	e9d8) BST='Windows Vista/7';;
	f6f6) BST='- (cleared BS by FDISK)';;
	fa33) BST='Windows XP';;
	fbc0) BST='ISOhybrid (Syslinux 3.81)';;

	## If Grub or Grub 2 is in the boot sector, investigate the embedded information. ##
	48b4) BST='Grub2 (v1.96)';
	      grub2_info ${part} ${drive} '1.96';
	      BSI="${BSI} Grub2 (v1.96) is installed in the boot sector of ${name} and ${Grub2_Msg}.";;
	7c3c) BST='Grub2 (v1.97-1.98)';
	      grub2_info ${part} ${drive} '1.97';
	      BSI="${BSI} Grub2 (v1.97-1.98) is installed in the boot sector of ${name} and ${Grub2_Msg}.";;
	0020) BST='Grub2 (v1.99)';
	      grub2_info ${part} ${drive} '1.99';
	      BSI="${BSI} Grub2 (v1.99) is installed in the boot sector of ${name} and ${Grub2_Msg}.";;
 aa75 | 5272) BST='Grub Legacy';
	      stage2_loc ${part};
	      BSI="${BSI} Grub Legacy (v${Grub_Version}) is installed in the boot sector of ${name} and ${Stage2_Msg}";;

	## If Lilo is in the VBR, look for map file ##
	8053) BST='LILO';
	      # 0x20-0x23 contains the offset of /boot/map.
	      offset=$(hexdump -v -s 32 -n 4 -e '"%u"' ${part});

	      BSI="${BSI} LILO is installed in boot sector of ${part} and looks at sector ${offset} of ${drive} for the \"map\" file,";

	      # check whether offset is on the hard drive.
	      if [ ${offset} -lt  ${size} ] ; then
		 tmp=$(dd if=${drive} skip=${offset} count=1 2>> ${Trash} | hexdump -v -s 508 -n 4 -e '"%_p"');	
		 
		 if [ "${tmp}" = 'LILO' ] ; then
		    BSI="${BSI} and the \"map\" file was found at this location.";
		 else
		    BSI="${BSI} but the \"map\" file was not found at this location.";
		 fi
	      else
		 BSI="${BSI} but the \"map\" file was not found at this location.";
	      fi;;

	0000) # If the first two bytes are zero, the boot sector does not contain any boot loader.
	      BST='-';;

	   *) BST='Unknown';
	      printf "Unknown BootLoader on ${name}\n\n" >> ${Unknown_MBR};
	      hexdump -n 512 -C ${part} >> ${Unknown_MBR};
	      echo >> ${Unknown_MBR};;
  esac