summaryrefslogtreecommitdiff
path: root/isohybrid-acritox
blob: 3b2e817761c23b5bb81e7ddc127d82e848d92cfc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
#!/usr/bin/perl
# isohybrid-acritox - written by Andreas Loibl <andreas@andreas-loibl.de>
# 
# Post-process an ISO 9660 image generated with mkisofs/genisoimage and equipped with
# an embedded isohybrid-acritox space-file (default filename: /boot.isohybrid)
# to allow "multi-hybrid booting" as CD-ROM (EFI or El Torito) or as a hard-drive 
# (e.g. a USB pendrive) on Intel-Macs (EFI) and PCs (EFI or MBR). By adding a fake
# ISO9660-structure of the original image as partition inside the image it is possible
# to repartition such a multi-hybrid-image even when it is currently being used live.
# 
# This is accomplished by:
# * embedding a FAT-filesystem containing GRUB2EFI into the space-file
# * embedding a modified copy of the ISO9660-structure into the space-file
# * appending a HFS+-partiton containing GRUB2EFI at the end of the image
# * injecting an "Apple Partition Map" into the image referencing the HFS+-partition
# * adding a MBR partition table with two partitions:
#   1. EFI-FAT-partition representing the FAT-filesystem in the space-file
#   2. ISO-partition referencing the fake-ISO9660-header in the space-file,
#      spanning until the end of the image

# name of the isohybrid-acritox space-file embedded in the ISO
# NOTE: it is important that this file is the first file on the ISO, so make sure 
# you use the "-sort" option for mkisofs/genisofs and give it the highest weight
$space_filename="boot.isohybrid";

# EFI-FAT-image options
$fat_filename="efi-fat.img";
$fat_label="KANOTIX_EFI";

# EFI-HFS+-image options
$hfs_filename="efi-hfs.img";
$hfs_label="KANOTIX Mac";
$hfs_vollabel="http://kanotix.acritox.com/files/mac/label.vollabel";
$hfs_extras="http://kanotix.acritox.com/files/mac/imagewriter.tar.gz";

# Enable verbose debug ouput if $debug=1;
$debug=1;

# blocksize 
$bs=0x0800; # 2048 bytes

# 512byte boot.img
$mbr='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';

# Apple Partition Map entries:
$pm1='504d000000000003000000010000000f4170706c650000000000000000000000000000000000000000000000000000004170706c655f706172746974696f6e5f6d617000000000000000000000000000000000000000000f00000003'; # Apple_partition_map
$pm2='504d00000000000300000400000005006469736b20696d616765000000000000000000000000000000000000000000004170706c655f4846530000000000000000000000000000000000000000000000000000000000040040000033'; # Apple_HFS
$pm3='504d00000000000300000001000004004b414e4f5449585f454649000000000000000000000000000000000000000000444f535f4641545f313200000000000000000000000000000000000000000000000000000000040040000033'; # DOS_FAT_12

# Pad the image to a fake cylinder boundary
$cylsize = 1024*1024; # 1MB

die "Usage: $0 <binary-hybrid.iso>\n" if $#ARGV != 0;

use integer;
sub max ($$) { $_[$_[0] < $_[1]] }
sub min ($$) { $_[$_[0] > $_[1]] }

($file) = @ARGV;

open(FIMG, "+< $file\0") or die "$0: cannot open $file: $!\n";
binmode FIMG;

# Check if image has already been "patched" (i.e. it has the APM signature from $block0)
seek(FIMG, 0, SEEK_SET) or die "$0: $file: $!\n";
read(FIMG, $test, 2) == 2 or die "$0: $file: read error\n";
die "$file seems to have an APM signature already...\n" if($test eq 'ER');

# Check if image is already a isohybrid-bg2 image (i.e. it has GRUB in its MBR)
seek(FIMG, 0x180, SEEK_SET) or die "$0: $file: $!\n";
read(FIMG, $test, 4) == 4 or die "$0: $file: read error\n";
die "$file seems to have GRUB in its MBR already...\n" if($test eq 'GRUB');

die "$0: /usr/bin/isoinfo missing!\n" unless (-e '/usr/bin/isoinfo');

# Get the position of the space-file
$csf_pos_blk = int(`/usr/bin/isoinfo -R -s -l -i "$file" | awk '/$space_filename/{print \$10}'`);
if (!$csf_pos_blk) {
    die "$0: cannot determine position of space-file: $space_filename\n";
}
$csf_pos_lba = $csf_pos_blk*4;
$csf_pos = $csf_pos_lba*512;

# Get the size of the space-file
$csf_size_blk = int(`/usr/bin/isoinfo -R -s -l -i "$file" | awk '/$space_filename/{print \$5}'`);
if (!$csf_size_blk) {
    die "$0: cannot determine size of space-file: $space_filename\n";
}
$csf_size_lba = $csf_size_blk*4;
$csf_size = $csf_size_lba*512;

# Get the total size of the image
(@imgstat = stat(FIMG)) or die "$0: $file: $!\n";
$imgsize = $imgstat[7];
if (!$imgsize) {
    die "$0: $file: cannot determine length of file\n";
}

print "imgsize: $imgsize\n" if($debug);

# Fixed position of FAT partition at LBA 2048
# TODO: add check if LBA 2048 is actually inside the space-file
$fat_pos_lba = 2048;
$fat_pos = $fat_pos_lba*512;
$fat_pos_blk = $fat_pos_lba/4;

# Set the maximum size of the FAT partiton
$fat_maxsize_blk = $csf_pos_blk + $csf_size_blk - $fat_pos_blk;
$fat_maxsize_blk -= $fat_maxsize_blk % 16;

# Generate the FAT partition
print <<`SHELL`;
if [ ! -x /usr/bin/mmd ]; then
        echo "Error: mtools are needed! Run: apt-get install mtools" >&2
        exit 1
fi

rm -f "$fat_filename"

# Stuff boot*.efi into a FAT filesystem 
# mkfs.msdos has blocksize 1024 => multiply with 2
mkfs.msdos -n "$fat_label" -C "$fat_filename" \$(($fat_maxsize_blk*2)) >&2
mmd -i "$fat_filename" ::efi
mmd -i "$fat_filename" ::efi/boot
for file in binary/efi/boot/boot*.efi
do
        mcopy -i "$fat_filename" \$file "::efi/boot/\$(basename "\$file")"
done

# hide the FAT-EFI-partition from the Mac Bootloader by f***ing up the "EFI" directory entry
mattrib -i "$fat_filename" +h ::efi
sed -i -e '0,/EFI        /s/EFI        /efi        /' "$fat_filename"

exit 0
SHELL
die "$0: EFI-FAT-image creation failed" if (${^CHILD_ERROR_NATIVE});

open(FFAT, "< $fat_filename\0") or die "$0: cannot open $fat_filename: $!\n";
binmode FFAT;

# Get the total size of the FAT partiton
(@fat_stat = stat(FFAT)) or die "$0: $fat_filename: $!\n";
$fat_size = $fat_stat[7];
$fat_size_lba = $fat_size/512;
$fat_size_blk = $fat_size_lba/4;
if (!$fat_size) {
    die "$0: $fat_filename: cannot determine length of file\n";
}

print "fat_pos: $fat_pos fat_size: $fat_size\n" if($debug);

# Write FAT partition to image
seek(FFAT, 0, SEEK_SET) or die "$0: $fat_filename: $!\n";
read FFAT, $partition, $fat_size;
seek(FIMG, $fat_pos, SEEK_SET) or die "$0: $file: $!\n";
print FIMG $partition;
close(FFAT);

# Generate the HFS partition
$inode = int(<<`SHELL`);
img="$hfs_filename"
label="$hfs_label"
vollabel="$hfs_vollabel"
extras="$hfs_extras"
workdir=

cleanup () {
        [ "\$workdir" ] || exit
	umount "\$workdir" 2>/dev/null | :
	rm -rf "\$workdir"
}
trap cleanup EXIT HUP INT QUIT TERM

workdir="\$(mktemp -d efi-image.XXXXXX)"

# Stuff boot*.efi into a HFS+ filesystem, making it as small as possible (in MB steps).
# (x+1023)/1024*1024 rounds up to multiple of 1024.
dd if=/dev/zero of="\$img" bs=1k count=\$(( (\$(stat -c %s binary/efi/boot/boot*.efi | awk '{s+=\$1} END {print s}') / 1024 + 1023) / 1024 * 1024 )) 2>/dev/null
mkfs.hfsplus -v "\$label" "\$img" >&2
mount -o loop,creator=prhc,type=jxbt,uid=99,gid=99 "\$img" "\$workdir"
case "\$vollabel" in
http*|ftp*)
	wget -qO"\$workdir"/.disk_label "\$vollabel"
	;;
*)
	[ -e "\$vollabel" ] && cp "\$vollabel" "\$workdir"/.disk_label
	;;
esac
mkdir -p "\$workdir"/efi/boot

for file in binary/efi/boot/boot*.efi
do
	cp "\$file" "\$workdir/efi/boot/\$(basename "\$file")"
done

for extra in \$extras
do
	extrabase="\$(basename "\$extra")"
	case "\$extra" in
	http*|ftp*)
		wget -qO"\$workdir/\$extrabase" "\$extra"
		;;
	*)
		[ -e "\$extra" ] && cp "\$extra" "\$workdir/\$extrabase"
		;;
	esac
	case "\$extrabase" in
	*.tar.gz)
		if [ -e "\$workdir/\$extrabase" ]; then
			tar xzf "\$workdir/\$extrabase" -C "\$workdir"
			rm "\$workdir/\$extrabase"
		fi
		;;
	esac
done

set -- \$(ls -i \$workdir/efi/boot/boot*.efi)
inode=\$1

umount "\$workdir"
# return the inode that needs to be blessed
echo "\$inode"
exit 0
SHELL
die "$0: EFI-HFS-image creation failed" if (${^CHILD_ERROR_NATIVE} || $inode < 1);

open(FHFS, "+< $hfs_filename\0") or die "$0: cannot open $hfs_filename: $!\n";
binmode FHFS;

# Check if partition contains a HFS+ filesystem
seek(FHFS, 0x400, SEEK_SET) or die "$0: $file: $!\n";
read(FHFS, $test, 2) == 2 or die "$0: $file: read error\n";
die "$hfs_filename doesn't seem to contain a HFS+ filesystem\n" if($test ne 'H+');

# Bless the HFS image
print "HFS: blessing file with inode $inode\n" if($debug);
seek(FHFS, 0x450, SEEK_SET) or die "$!\n";
print FHFS pack('NN', 2, $inode);
seek(FHFS, 0x464, SEEK_SET) or die "$!\n";
print FHFS pack('N', 2, $inode);

# Get the total size of the HFS partiton
(@hfs_stat = stat(FHFS)) or die "$0: $hfs_filename: $!\n";
$hfs_size = $hfs_stat[7];
$hfs_size_lba = $hfs_size/512;
$hfs_size_blk = $hfs_size_lba/4;
if (!$hfs_size) {
    die "$0: $hfs_filename: cannot determine length of file\n";
}

# Write MBR
seek(FIMG, 0, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('H*',$mbr);
# Update GRUB2 locations
seek(FIMG, 0x5c, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack("V", $csf_pos_lba);
seek(FIMG, $csf_pos + 0x1f4, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack("V", $csf_pos_lba+1);
# Write ApplePartitionMap entries
seek(FIMG, $bs*1, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('H*',$pm1);
seek(FIMG, $bs*2, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('H*',$pm2);
seek(FIMG, $bs*3, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('H*',$pm3);

# Pad the image to a fake cylinder boundary
$frac = $imgsize % $cylsize;
$padding = ($frac > 0) ? $cylsize - $frac : 0;
if ($padding) {
    seek(FIMG, $imgsize, SEEK_SET) or die "$0: $file: $!\n";
    print FIMG "\0" x $padding;
    $imgsize += $padding;
}

# Position of the HFS partition
$hfs_pos = $imgsize;
$hfs_pos_lba = $hfs_pos/512;
$hfs_pos_blk = $hfs_pos_lba/4;

# Append HFS partition to image
seek(FHFS, 0, SEEK_SET) or die "$0: $file: $!\n";
read FHFS, $partition, $hfs_size;
seek(FIMG, $imgsize, SEEK_SET) or die "$0: $file: $!\n";
print FIMG $partition;
close(FHFS);

# Pad the HFS partition to a fake cylinder boundary
$frac = $hfs_size % $cylsize;
$padding = ($frac > 0) ? $cylsize - $frac : 0;
if ($padding) {
    print FIMG "\0" x $padding;
}
$hfs_size += $padding;
$hfs_size_lba = $hfs_size/512;
$hfs_size_blk = $hfs_size_lba/4;

print "hfs_pos: $hfs_pos hfs_size: $hfs_size\n" if($debug);

# Adjust $pm2 (Apple_HFS)
# "physical block start" and "physical block count" of partition:
seek(FIMG, $bs*2+8, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('NN', $hfs_pos_blk, $hfs_size_blk);
# "logical block start" and "logical block count" of partition:
seek(FIMG, $bs*2+80, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('NN', 0, $hfs_size_blk);

# Adjust $pm3 (DOS_FAT_12)
# "physical block start" and "physical block count" of partition:
seek(FIMG, $bs*3+8, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('NN', $fat_pos_blk, $fat_size_blk);
# "logical block start" and "logical block count" of partition:
seek(FIMG, $bs*3+80, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack('NN', 0, $fat_size_blk);

$imgsize += $hfs_size;
seek(FIMG, $imgsize, SEEK_SET) or die "$0: $file: $!\n";

# Pad the image to a fake cylinder boundary
$frac = $imgsize % $cylsize;
$padding = ($frac > 0) ? $cylsize - $frac : 0;
$imgsize += $padding;
if ($padding) {
    print FIMG "\0" x $padding;
}

# Position of the ISO partition: one block after the FAT partition
$iso_pos_blk = $fat_pos_blk + $fat_size_blk;
$iso_pos_lba = $iso_pos_blk*4;
$iso_pos = $iso_pos_lba*512;
# Size of the ISO partition: spanning until the end of the image (including HFS partition)
$iso_size = $imgsize - $iso_pos;
$iso_size_lba = $iso_size/512;
$iso_size_blk = $iso_size_lba/4;

print "iso_pos: $iso_pos iso_size: $iso_size\n" if($debug);
print "final imgsize: $imgsize\n" if($debug);

# Calculate and write partiton table (MBR)
$h = 64; $s = 32;
$hpc = 32; $spt = 63;
$cc = min(1024, $imgsize/$cylsize);

$pentry  = 1;
$fstype  = 0xEF;
$bcyl = $fat_pos_lba / ($spt * $hpc);
$bhead = ($fat_pos_lba / $spt) % $hpc;
$bsect = ($fat_pos_lba % $spt) + 1;
$ehead   = $h-1;
$esect   = $s + ((($cc-1) & 0x300) >> 2);
$ecyl    = ($cc-1) & 0xff;
seek(FIMG, 430+16*$pentry, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype, $ehead, $esect, $ecyl, $fat_pos_lba, $fat_size_lba);

$pentry  = 2;
$fstype  = 0x83;
$bcyl = $iso_pos_lba / ($spt * $hpc);
$bhead = ($iso_pos_lba / $spt) % $hpc;
$bsect = ($iso_pos_lba % $spt) + 1;
$ehead   = $h-1;
$esect   = $s + ((($cc-1) & 0x300) >> 2);
$ecyl    = ($cc-1) & 0xff;
seek(FIMG, 430+16*$pentry, SEEK_SET) or die "$0: $file: $!\n";
print FIMG pack("CCCCCCCCVV", 0x00, $bhead, $bsect, $bcyl, $fstype, $ehead, $esect, $ecyl, $iso_pos_lba, $iso_size_lba);

# Delete partition entries 3 and 4
print FIMG "\0" x 32;

# Embed a copy of the ISO filesystem into the ISO at the second partition
seek(FIMG, 0, SEEK_SET) or die "$0: $file: $!\n";
read FIMG, $iso_copy, $csf_pos;
seek(FIMG, $iso_pos, SEEK_SET) or die "$0: $file: $!\n";
print FIMG $iso_copy;

sub write_val
{
	my($offset, $value) = @_;
	$cur = tell(FIMG);
	$offset += $cur if $offset < 0;
	printf("byte-offset: 0x%X -> 0x%X\n", $offset, $offset-$iso_pos) if($debug);
	seek(FIMG, $offset, SEEK_SET);
	print FIMG $value;
	seek(FIMG, $cur, SEEK_SET);
}

# ISO9660 Primary Volume Descriptor
$off_pvd = $iso_pos+0x8000;
do
{
	seek(FIMG, $off_pvd, SEEK_SET) or die "$0: $file: $!\n";
	read(FIMG, $voldesc_head, 7) > 0 or die "$0: $file: read error\n";
	($type, $magic, $version) = unpack("Ca[5]C", $voldesc_head);
	if($type == 1)
	{
		seek(FIMG, 0x97, 1);
		read(FIMG, $voldesc, 8) > 0 or die "$0: $file: read error\n";
		($first_sector_blk, $first_sector_blk_be) = unpack("VN", $voldesc);
		seek(FIMG, $iso_pos+$first_sector_blk*$bs, SEEK_SET) or die "$0: $file: $!\n";
		printf("root-directory entry at 0x%X:\n", tell(FIMG)) if($debug);
		read(FIMG, $bytes, 1) > 0 or die "$0: $file: read error\n";
		$bytes = unpack("C", $bytes) - 1; $sector_blk = 0;
		do {
			printf("SUSP entry - %u bytes (0x%X)\n", $bytes+1, $bytes+1) if($debug);
			do {
				$wp = tell(FIMG);
				$bytes -= read(FIMG, $voldesc, 32);
				($ext_sectors, $susp_pos_blk, $susp_pos_blk_be, $size, $size_be, $uu, $namelen)
					= unpack("CVNVNa[14]C", $voldesc);
				if($susp_pos_blk > $iso_pos_blk)
				{
					printf("LBA 0x%x -> LBA 0x%x\n", $susp_pos_blk, $susp_pos_blk - $iso_pos_blk) if($debug);
					write_val($wp+1, pack("VN", $susp_pos_blk - $iso_pos_blk, $susp_pos_blk - $iso_pos_blk));
				}
				$namelen++ if $namelen % 2 == 0;
				$bytes -= read(FIMG, $name, $namelen);
				$filename = unpack("Z*", $name);
				print("file: $filename\n") if($debug);
				# hide the second ISOFS-EFI-partition from the Mac Bootloader by f***ing up the "EFI" directory entry
				write_val(-$namelen, pack("Z*", ".PC")) if($filename eq "EFI");

				$bytes -= read(FIMG, $sua_head, 4);
				($sig, $len, $version) = unpack("a[2]CC", $sua_head);
				$len -= 4;
				$bytes -= read(FIMG, $data, $len);
				do {
					$bytes -= read(FIMG, $sua_head, 4);
					($sig, $len, $version) = unpack("a[2]CCa", $sua_head);
					$len -= 4;
					$bytes -= read(FIMG, $data, $len);
					if($sig eq "CE")
					{
						($sua_block, $uu1, $sua_pos, $uu2, $sua_size, $uu3) = unpack("VNVNVN", $data);
						printf("CE is at LBA 0x%X -> 0x%x\n", $sua_block) if($debug);
					}
				} while($bytes > 4);
				$bytes -= read(FIMG, $uu, $bytes) if $bytes > 0; # skip bytes (if unaligned)
				read(FIMG, $bytes, 1) > 0 or die "$0: $file: read error\n";
				$bytes = unpack("C", $bytes) - 1;
				printf("SUSP Entry - %u bytes (0x%X)\n", $bytes+1, $bytes+1) if($debug);
			} while $bytes > 0;
			$sector_blk++;
			seek(FIMG, $iso_pos+$first_sector_blk*$bs+$sector_blk*$bs, SEEK_SET) or die "$0: $file: $!\n";
			printf("\ndirectory entry at 0x%X:\n", tell(FIMG)) if($debug);
			read(FIMG, $bytes, 1) > 0 or break;
			$bytes = unpack("C", $bytes) - 1;
		} while $bytes != 0x21 && $bytes != 0;
	}
	$off_pvd+=$bs;
} while $type != 255;

# Done...
close(FIMG);

exit 0;