utils/isohybrid.pl

   1 #!/usr/bin/perl
   2 ## -----------------------------------------------------------------------
   3 ##
   4 ##   Copyright 2002-2008 H. Peter Anvin - All Rights Reserved
   5 ##   Copyright 2009 Intel Corporation; author: H. Peter Anvin
   6 ##
   7 ##   This program is free software; you can redistribute it and/or modify
   8 ##   it under the terms of the GNU General Public License as published by
   9 ##   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
  10 ##   Boston MA 02111-1307, USA; either version 2 of the License, or
  11 ##   (at your option) any later version; incorporated herein by reference.
  12 ##
  13 ## -----------------------------------------------------------------------
  14
  15 #
  16 # Post-process an ISO 9660 image generated with mkisofs/genisoimage
  17 # to allow "hybrid booting" as a CD-ROM or as a hard disk.
  18 #
  19
  20 use bytes;
  21 use Fcntl;
  22
  23 # User-specifyable options
  24 %opt = (
  25     # Fake geometry (zipdrive-style...)
  26     'h'      => 64,
  27     's'      => 32,
  28     # Partition number
  29     'entry'  => 1,
  30     # Partition offset
  31     'offset' => 0,
  32     # Partition type
  33     'type'   => 0x17,           # "Windows hidden IFS"
  34     # MBR ID
  35     'id'     => undef,
  36 );
  37
  38 %valid_range = (
  39     'h'      => [1, 256],
  40     's'      => [1, 63],
  41     'entry'  => [1, 4],
  42     'offset' => [0, 64],
  43     'type'   => [0, 255],
  44     'id'     => [0, 0xffffffff],
  45     'hd0'    => [0, 2],
  46     'partok' => [0, 1],
  47 );
  48
  49 # Boolean options just set other options
  50 %bool_opt = (
  51     'nohd0'    => ['hd0', 0],
  52     'forcehd0' => ['hd0', 1],
  53     'ctrlhd0'  => ['hd0', 2],
  54     'nopartok' => ['partok', 0],
  55     'partok'   => ['partok', 1],
  56 );
  57
  58 sub usage() {
  59     print STDERR "Usage: $0 [options] filename.iso\n",
  60     "Options:\n",
  61     "  -h          Number of default geometry heads\n",
  62     "  -s          Number of default geometry sectors\n",
  63     "  -entry      Specify partition entry number (1-4)\n",
  64     "  -offset     Specify partition offset (default 0)\n",
  65     "  -type       Specify partition type (default 0x17)\n",
  66     "  -id         Specify MBR ID (default random)\n",
  67     "  -forcehd0   Always assume we are loaded as disk ID 0\n",
  68     "  -ctrlhd0    Assume disk ID 0 if the Ctrl key is pressed\n",
  69     "  -partok     Allow booting from within a partition\n";
  70     exit 1;
  71 }
  72
  73 # Parse a C-style integer (decimal/octal/hex)
  74 sub doh($) {
  75     my($n) = @_;
  76     return ($n =~ /^0/) ? oct $n : $n+0;
  77 }
  78
  79 sub get_random() {
  80     # Get a 32-bit random number
  81     my $rfd, $rnd;
  82     my $rid;
  83
  84     if (open($rfd, "< /dev/urandom\0") && read($rfd, $rnd, 4) == 4) {
  85         $rid = unpack("V", $rnd);
  86     }
  87
  88     close($rfd) if (defined($rfd));
  89     return $rid if (defined($rid));
  90
  91     # This sucks but is better than nothing...
  92     return ($$+time()) & 0xffffffff;
  93 }
  94
  95 sub get_hex_data() {
  96     my $mbr = '';
  97     my $line, $byte;
  98     while ( $line = <DATA> ) {
  99         chomp $line;
 100         last if ($line eq '*');
 101         foreach $byte ( split(/\s+/, $line) ) {
 102             $mbr .= chr(hex($byte));
 103         }
 104     }
 105     return $mbr;
 106 }
 107
 108 while ($ARGV[0] =~ /^\-(.*)$/) {
 109     $o = $1;
 110     shift @ARGV;
 111     if (defined($bool_opt{$o})) {
 112         ($o, $v) = @{$bool_opt{$o}};
 113         $opt{$o} = $v;
 114     } elsif (exists($opt{$o})) {
 115         $opt{$o} = doh(shift @ARGV);
 116         if (defined($valid_range{$o})) {
 117             ($l, $h) = @{$valid_range{$o}};
 118             if ($opt{$o} < $l || $opt{$o} > $h) {
 119                 die "$0: valid values for the -$o parameter are $l to $h\n";
 120             }
 121         }
 122     } else {
 123         usage();
 124     }
 125 }
 126
 127 ($file) = @ARGV;
 128
 129 if (!defined($file)) {
 130     usage();
 131 }
 132
 133 open(FILE, "+< $file\0") or die "$0: cannot open $file: $!\n";
 134 binmode FILE;
 135
 136 #
 137 # First, actually figure out where mkisofs hid isolinux.bin
 138 #
 139 seek(FILE, 17*2048, SEEK_SET) or die "$0: $file: $!\n";
 140 read(FILE, $boot_record, 2048) == 2048 or die "$0: $file: read error\n";
 141 ($br_sign, $br_cat_offset) = unpack("a71V", $boot_record);
 142 if ($br_sign ne ("\0CD001\1EL TORITO SPECIFICATION" . ("\0" x 41))) {
 143     die "$0: $file: no boot record found\n";
 144 }
 145 seek(FILE, $br_cat_offset*2048, SEEK_SET) or die "$0: $file: $!\n";
 146 read(FILE, $boot_cat, 2048) == 2048 or die "$0: $file: read error\n";
 147
 148 # We must have a Validation Entry followed by a Default Entry...
 149 # no fanciness allowed for the Hybrid mode [XXX: might relax this later]
 150 @ve = unpack("v16", $boot_cat);
 151 $cs = 0;
 152 for ($i = 0; $i < 16; $i++) {
 153     $cs += $ve[$i];
 154 }
 155 if ($ve[0] != 0x0001 || $ve[15] != 0xaa55 || $cs & 0xffff) {
 156     die "$0: $file: invalid boot catalog\n";
 157 }
 158 ($de_boot, $de_media, $de_seg, $de_sys, $de_mbz1, $de_count,
 159  $de_lba, $de_mbz2) = unpack("CCvCCvVv", substr($boot_cat, 32, 32));
 160 if ($de_boot != 0x88 || $de_media != 0 ||
 161     ($de_segment != 0 && $de_segment != 0x7c0) || $de_count != 4) {
 162     die "$0: $file: unexpected boot catalog parameters\n";
 163 }
 164
 165 # Now $de_lba should contain the CD sector number for isolinux.bin
 166 seek(FILE, $de_lba*2048+0x40, SEEK_SET) or die "$0: $file: $!\n";
 167 read(FILE, $ibsig, 4);
 168 if ($ibsig ne "\xfb\xc0\x78\x70") {
 169     die "$0: $file: bootloader does not have a isolinux.bin hybrid signature.".
 170         "Note that isolinux-debug.bin does not support hybrid booting.\n";
 171 }
 172
 173 # Get the total size of the image
 174 (@imgstat = stat(FILE)) or die "$0: $file: $!\n";
 175 $imgsize = $imgstat[7];
 176 if (!$imgsize) {
 177     die "$0: $file: cannot determine length of file\n";
 178 }
 179 # Target image size: round up to a multiple of $h*$s*512
 180 $h = $opt{'h'};
 181 $s = $opt{'s'};
 182 $cylsize = $h*$s*512;
 183 $frac = $imgsize % $cylsize;
 184 $padding = ($frac > 0) ? $cylsize - $frac : 0;
 185 $imgsize += $padding;
 186 $c = int($imgsize/$cylsize);
 187 if ($c > 1024) {
 188     print STDERR "Warning: more than 1024 cylinders ($c).\n";
 189     print STDERR "Not all BIOSes will be able to boot this device.\n";
 190     $cc = 1024;
 191 } else {
 192     $cc = $c;
 193 }
 194
 195 # Preserve id when run again
 196 if (defined($opt{'id'})) {
 197     $id = pack("V", doh($opt{'id'}));
 198 } else {
 199     seek(FILE, 440, SEEK_SET) or die "$0: $file: $!\n";
 200     read(FILE, $id, 4);
 201     if ($id eq "\x00\x00\x00\x00") {
 202         $id = pack("V", get_random());
 203     }
 204 }
 205
 206 # Print the MBR and partition table
 207 seek(FILE, 0, SEEK_SET) or die "$0: $file: $!\n";
 208
 209 for ($i = 0; $i <= $opt{'hd0'}+3*$opt{'partok'}; $i++) {
 210     $mbr = get_hex_data();
 211 }
 212 if ( length($mbr) > 432 ) {
 213     die "$0: Bad MBR code\n";
 214 }
 215
 216 $mbr .= "\0" x (432 - length($mbr));
 217
 218 $mbr .= pack("VV", $de_lba*4, 0);       # Offset 432: LBA of isolinux.bin
 219 $mbr .= $id;                            # Offset 440: MBR ID
 220 $mbr .= "\0\0";                         # Offset 446: actual partition table
 221
 222 # Print partition table
 223 $offset  = $opt{'offset'};
 224 $psize   = $c*$h*$s - $offset;
 225 $bhead   = int($offset/$s) % $h;
 226 $bsect   = ($offset % $s) + 1;
 227 $bcyl    = int($offset/($h*$s));
 228 $bsect  += ($bcyl & 0x300) >> 2;
 229 $bcyl   &= 0xff;
 230 $ehead   = $h-1;
 231 $esect   = $s + ((($cc-1) & 0x300) >> 2);
 232 $ecyl    = ($cc-1) & 0xff;
 233 $fstype  = $opt{'type'};        # Partition type
 234 $pentry  = $opt{'entry'};       # Partition slot
 235
 236 for ( $i = 1 ; $i <= 4 ; $i++ ) {
 237     if ( $i == $pentry ) {
 238         $mbr .= pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
 239                      $ehead, $esect, $ecyl, $offset, $psize);
 240     } else {
 241         $mbr .= "\0" x 16;
 242     }
 243 }
 244 $mbr .= "\x55\xaa";
 245
 246 print FILE $mbr;
 247
 248 # Pad the image to a fake cylinder boundary
 249 seek(FILE, $imgstat[7], SEEK_SET) or die "$0: $file: $!\n";
 250 if ($padding) {
 251     print FILE "\0" x $padding;
 252 }
 253
 254 # Done...
 255 close(FILE);
 256
 257 exit 0;
 258 __END__
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 274 *
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 290 0
 291 *
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 300 1 6a 10 89 e6 66 f7 36 e8 7b c0 e4 6 88 e1 88 c5 92 f6 36 ee 7b 88 c6 8 e1
 301 41 b8 1 2 8a 16 f2 7b cd 13 8d 64 10 66 61 c3 e8 1e 0 4f 70 65 72 61 74 69
 302 6e 67 20 73 79 73 74 65 6d 20 6c 6f 61 64 20 65 72 72 6f 72 2e d a 5e ac b4
 303 e 8a 3e 62 4 b3 7 cd 10 3c a 75 f1 cd 18 f4 eb fd 0 0 0 0 0 0 0 0 0 0 0 0
 304 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 305 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 306 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 307 *
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 309 3d 21 47 50 58 75 10 80 7c 4 ee 75 a 66 8b 4c 30 66 8b 5c 34 eb 4 66 8b 4c
 310 8 66 53 66 51 6 57 8e dd 8e c5 52 be 0 7c bf 0 6 b9 0 1 f3 a5 ea 50 6 0 0
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 312 b 66 c7 6 f6 6 b4 42 eb 15 eb 0 5a 51 b4 8 cd 13 83 e1 3f 5b 51 f b6 c6 40
 313 50 f7 e1 53 52 50 bb 0 7c b9 4 0 66 a1 b0 7 e8 44 0 f 82 80 0 66 40 80 c7
 314 2 e2 f2 66 81 3e 40 7c fb c0 78 70 75 9 fa bc ec 7b ea 44 7c 0 0 e8 83 0 69
 315 73 6f 6c 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 6e 67 20 6f 72 20 63 6f
 316 72 72 75 70 74 2e d a 66 60 66 31 d2 66 3 6 f8 7b 66 13 16 fc 7b 66 52 66
 317 50 6 53 6a 1 6a 10 89 e6 66 f7 36 e8 7b c0 e4 6 88 e1 88 c5 92 f6 36 ee 7b
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 322 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 323 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 324 *
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 330 c6 40 50 f7 e1 53 52 50 bb 0 7c b9 4 0 66 a1 b0 7 e8 44 0 f 82 80 0 66 40
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 332 83 0 69 73 6f 6c 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 6e 67 20 6f 72
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 334 66 52 66 50 6 53 6a 1 6a 10 89 e6 66 f7 36 e8 7b c0 e4 6 88 e1 88 c5 92 f6
 335 36 ee 7b 88 c6 8 e1 41 b8 1 2 8a 16 f2 7b cd 13 8d 64 10 66 61 c3 e8 1e 0
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 340 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 341 *
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 357 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 358 *