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__ 259 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 260 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 66 53 261 66 51 6 57 8e dd 8e c5 52 be 0 7c bf 0 6 b9 0 1 f3 a5 ea 4b 6 0 0 52 b4 41 262 bb aa 55 31 c9 30 f6 f9 cd 13 72 16 81 fb 55 aa 75 10 83 e1 1 74 b 66 c7 6 263 f1 6 b4 42 eb 15 eb 0 5a 51 b4 8 cd 13 83 e1 3f 5b 51 f b6 c6 40 50 f7 e1 264 53 52 50 bb 0 7c b9 4 0 66 a1 b0 7 e8 44 0 f 82 80 0 66 40 80 c7 2 e2 f2 66 265 81 3e 40 7c fb c0 78 70 75 9 fa bc ec 7b ea 44 7c 0 0 e8 83 0 69 73 6f 6c 266 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 6e 67 20 6f 72 20 63 6f 72 72 75 267 70 74 2e d a 66 60 66 31 d2 66 3 6 f8 7b 66 13 16 fc 7b 66 52 66 50 6 53 6a 268 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 269 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 69 270 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 271 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 0 272 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 0 273 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 0 274 0 0 0 0 0 0 0 0 0 0 0 0 0 0 275 * 276 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 277 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 66 53 278 66 51 6 57 8e dd 8e c5 b2 80 52 be 0 7c bf 0 6 b9 0 1 f3 a5 ea 4d 6 0 0 52 279 b4 41 bb aa 55 31 c9 30 f6 f9 cd 13 72 16 81 fb 55 aa 75 10 83 e1 1 74 b 66 280 c7 6 f3 6 b4 42 eb 15 eb 0 5a 51 b4 8 cd 13 83 e1 3f 5b 51 f b6 c6 40 50 f7 281 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 2 e2 f2 282 66 81 3e 40 7c fb c0 78 70 75 9 fa bc ec 7b ea 44 7c 0 0 e8 83 0 69 73 6f 283 6c 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 6e 67 20 6f 72 20 63 6f 72 72 284 75 70 74 2e d a 66 60 66 31 d2 66 3 6 f8 7b 66 13 16 fc 7b 66 52 66 50 6 53 285 6a 1 6a 10 89 e6 66 f7 36 e8 7b c0 e4 6 88 e1 88 c5 92 f6 36 ee 7b 88 c6 8 286 e1 41 b8 1 2 8a 16 f2 7b cd 13 8d 64 10 66 61 c3 e8 1e 0 4f 70 65 72 61 74 287 69 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 288 b4 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 0 289 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 0 290 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 0 291 0 0 0 0 0 0 0 0 0 0 0 0 0 292 * 293 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 294 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 66 53 295 66 51 6 57 8e dd 8e c5 60 b4 2 cd 16 a8 4 61 74 2 b2 80 52 be 0 7c bf 0 6 296 b9 0 1 f3 a5 ea 57 6 0 0 52 b4 41 bb aa 55 31 c9 30 f6 f9 cd 13 72 16 81 fb 297 55 aa 75 10 83 e1 1 74 b 66 c7 6 fd 6 b4 42 eb 15 eb 0 5a 51 b4 8 cd 13 83 298 e1 3f 5b 51 f b6 c6 40 50 f7 e1 53 52 50 bb 0 7c b9 4 0 66 a1 b0 7 e8 44 0 299 f 82 80 0 66 40 80 c7 2 e2 f2 66 81 3e 40 7c fb c0 78 70 75 9 fa bc ec 7b 300 ea 44 7c 0 0 e8 83 0 69 73 6f 6c 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 301 6e 67 20 6f 72 20 63 6f 72 72 75 70 74 2e d a 66 60 66 31 d2 66 3 6 f8 7b 302 66 13 16 fc 7b 66 52 66 50 6 53 6a 1 6a 10 89 e6 66 f7 36 e8 7b c0 e4 6 88 303 e1 88 c5 92 f6 36 ee 7b 88 c6 8 e1 41 b8 1 2 8a 16 f2 7b cd 13 8d 64 10 66 304 61 c3 e8 1e 0 4f 70 65 72 61 74 69 6e 67 20 73 79 73 74 65 6d 20 6c 6f 61 305 64 20 65 72 72 6f 72 2e d a 5e ac b4 e 8a 3e 62 4 b3 7 cd 10 3c a 75 f1 cd 306 18 f4 eb fd 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 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 0 308 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 309 * 310 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 311 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 21 f6 312 74 26 f6 4 7f 75 21 38 4c 4 74 1c 66 3d 21 47 50 58 75 10 80 7c 4 ed 75 a 313 66 8b 4c 34 66 8b 5c 38 eb 4 66 8b 4c 8 66 53 66 51 6 57 8e dd 8e c5 52 be 314 0 7c bf 0 6 b9 0 1 f3 a5 ea 75 6 0 0 52 b4 41 bb aa 55 31 c9 30 f6 f9 cd 13 315 72 16 81 fb 55 aa 75 10 83 e1 1 74 b 66 c7 6 1b 7 b4 42 eb 15 eb 0 5a 51 b4 316 8 cd 13 83 e1 3f 5b 51 f b6 c6 40 50 f7 e1 53 52 50 bb 0 7c b9 4 0 66 a1 b0 317 7 e8 44 0 f 82 80 0 66 40 80 c7 2 e2 f2 66 81 3e 40 7c fb c0 78 70 75 9 fa 318 bc ec 7b ea 44 7c 0 0 e8 83 0 69 73 6f 6c 69 6e 75 78 2e 62 69 6e 20 6d 69 319 73 73 69 6e 67 20 6f 72 20 63 6f 72 72 75 70 74 2e d a 66 60 66 31 d2 66 3 320 6 f8 7b 66 13 16 fc 7b 66 52 66 50 6 53 6a 1 6a 10 89 e6 66 f7 36 e8 7b c0 321 e4 6 88 e1 88 c5 92 f6 36 ee 7b 88 c6 8 e1 41 b8 1 2 8a 16 f2 7b cd 13 8d 322 64 10 66 61 c3 e8 1e 0 4f 70 65 72 61 74 69 6e 67 20 73 79 73 74 65 6d 20 323 6c 6f 61 64 20 65 72 72 6f 72 2e d a 5e ac b4 e 8a 3e 62 4 b3 7 cd 10 3c a 324 75 f1 cd 18 f4 eb fd 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 0 325 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 0 326 * 327 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 328 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 21 f6 329 74 26 f6 4 7f 75 21 38 4c 4 74 1c 66 3d 21 47 50 58 75 10 80 7c 4 ed 75 a 330 66 8b 4c 34 66 8b 5c 38 eb 4 66 8b 4c 8 66 53 66 51 6 57 8e dd 8e c5 b2 80 331 52 be 0 7c bf 0 6 b9 0 1 f3 a5 ea 77 6 0 0 52 b4 41 bb aa 55 31 c9 30 f6 f9 332 cd 13 72 16 81 fb 55 aa 75 10 83 e1 1 74 b 66 c7 6 1d 7 b4 42 eb 15 eb 0 5a 333 51 b4 8 cd 13 83 e1 3f 5b 51 f b6 c6 40 50 f7 e1 53 52 50 bb 0 7c b9 4 0 66 334 a1 b0 7 e8 44 0 f 82 80 0 66 40 80 c7 2 e2 f2 66 81 3e 40 7c fb c0 78 70 75 335 9 fa bc ec 7b ea 44 7c 0 0 e8 83 0 69 73 6f 6c 69 6e 75 78 2e 62 69 6e 20 336 6d 69 73 73 69 6e 67 20 6f 72 20 63 6f 72 72 75 70 74 2e d a 66 60 66 31 d2 337 66 3 6 f8 7b 66 13 16 fc 7b 66 52 66 50 6 53 6a 1 6a 10 89 e6 66 f7 36 e8 338 7b c0 e4 6 88 e1 88 c5 92 f6 36 ee 7b 88 c6 8 e1 41 b8 1 2 8a 16 f2 7b cd 339 13 8d 64 10 66 61 c3 e8 1e 0 4f 70 65 72 61 74 69 6e 67 20 73 79 73 74 65 340 6d 20 6c 6f 61 64 20 65 72 72 6f 72 2e d a 5e ac b4 e 8a 3e 62 4 b3 7 cd 10 341 3c a 75 f1 cd 18 f4 eb fd 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 342 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 0 343 * 344 33 ed 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 345 90 90 90 90 90 90 90 33 ed fa 8e d5 bc 0 7c fb fc 66 31 db 66 31 c9 21 f6 346 74 26 f6 4 7f 75 21 38 4c 4 74 1c 66 3d 21 47 50 58 75 10 80 7c 4 ed 75 a 347 66 8b 4c 34 66 8b 5c 38 eb 4 66 8b 4c 8 66 53 66 51 6 57 8e dd 8e c5 60 b4 348 2 cd 16 a8 4 61 74 2 b2 80 52 be 0 7c bf 0 6 b9 0 1 f3 a5 ea 81 6 0 0 52 b4 349 41 bb aa 55 31 c9 30 f6 f9 cd 13 72 16 81 fb 55 aa 75 10 83 e1 1 74 b 66 c7 350 6 27 7 b4 42 eb 15 eb 0 5a 51 b4 8 cd 13 83 e1 3f 5b 51 f b6 c6 40 50 f7 e1 351 53 52 50 bb 0 7c b9 4 0 66 a1 b0 7 e8 44 0 f 82 80 0 66 40 80 c7 2 e2 f2 66 352 81 3e 40 7c fb c0 78 70 75 9 fa bc ec 7b ea 44 7c 0 0 e8 83 0 69 73 6f 6c 353 69 6e 75 78 2e 62 69 6e 20 6d 69 73 73 69 6e 67 20 6f 72 20 63 6f 72 72 75 354 70 74 2e d a 66 60 66 31 d2 66 3 6 f8 7b 66 13 16 fc 7b 66 52 66 50 6 53 6a 355 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 356 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 69 357 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 358 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 0 359 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 0 360 * 361
