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#!/usr/bin/perl |
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|
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# (c)2003 Marc Alexander Lehmann <nbd@plan9.de> |
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|
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use Getopt::Long; |
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|
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use Linux::NBD; |
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use Linux::NBD::Client; |
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use Linux::NBD::Server; |
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|
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Getopt::Long::Configure ("bundling", "no_ignore_case"); |
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|
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my $device = undef; |
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my $image = undef; |
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my $offset = undef; |
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my $size = undef; |
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my $mount = undef; |
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my $verbose = 0; |
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|
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GetOptions ( |
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"device|d=s" => \$device, |
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"image|i=s" => \$image, |
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"offset|o=i" => \$offset, |
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"size|s=i" => \$size, |
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"verbose|v" => \$verbose, |
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"mount|m=s" => \$mount, |
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"help|h|?" => sub { |
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require Pod::Usage; |
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Pod::Usage::pod2usage(-exitstatus => 0, verbose => 2); |
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}, |
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) or exit 1; |
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|
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defined $device || defined $image |
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or die "You must specify one (or both) of the -d or -i switches. Use --help.\n"; |
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|
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# open an nbd device |
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my $client = new Linux::NBD::Client device => $device; |
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|
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# clear it |
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$client->clear_queue; |
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$client->disconnect; |
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$client->socket(undef); |
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|
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if (defined $image) { |
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# now attach the file |
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open IMAGE, "<", $image |
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or die "$image: $!"; |
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|
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unless (defined $offset and defined $size) { |
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require v5.8; |
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|
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# guess |
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sysread IMAGE, my $buf, 2352*100; |
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# find two volume descriptors... there _should_ be two ;) |
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# ISO has <type>CD001, we ignore high sierra |
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$buf =~ /\001CD001\001/g or die "unable to guess: no volume descriptor found"; |
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my $ofs1 = $-[0]; |
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$buf =~ /[\000\001\002\377]CD001\001/g or die "unable to guess: no second volume descriptor found"; |
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my $ofs2 = $-[0]; |
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$size = $ofs2 - $ofs1; |
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$offset = $ofs1 - 16 * 2048; # adjust offset so that sector 16 is the first volume header always. |
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printf "\nGuessed blocksize %d and offset 0x%04x\n", $size, $offset; |
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} |
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|
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my ($a, $b) = Linux::NBD::tcp_socketpair; |
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|
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# cleanup cleanly. oops ;) |
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$SIG{INT} = |
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$SIG{TERM} = |
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$SIG{QUIT} = |
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$SIG{HUP} = sub { exit }; |
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|
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# set the socket and fork the client service process |
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$client->set_blocksize(2048); |
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$client->set_size(-s IMAGE); |
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$client->socket($a); |
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$client->run_async; |
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|
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$device = $client->device; |
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|
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if (defined $mount) { |
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print "Running mount (you have to unmount yourself)\n"; |
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exec "mount", "-tiso9660", "-oro", $device, $mount |
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if fork == 0; |
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print "Everything set up, starting server\n"; |
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} else { |
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print <<EOF; |
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|
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Everything seems to be set up now, try something like: |
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|
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mount -tiso9660 $device /mnt |
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|
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Press ^C to exit... |
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EOF |
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} |
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|
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# now create a server instance and handle |
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# the requests. |
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|
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my $server = Server->new(socket => $b); |
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$server->run; |
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# never returns |
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} |
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|
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BEGIN { |
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@Server::ISA = Linux::NBD::Server::; |
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}; |
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|
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# implement only read requests (we emulate a primitive cdrom...) |
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|
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sub Server::req_read { |
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my ($self, $handle, $ofs, $len) = @_; |
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|
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my ($ofs_l, $ofs_h) = ($ofs & 2047, $ofs >> 11); |
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printf "READ %08x \@%08x (block $ofs_h+$ofs_l)\n", $len, $ofs if $verbose > 0; |
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$self->reply($handle); |
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|
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while ($len) { |
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sysseek IMAGE, ($ofs_h * $size) + $ofs_l + $offset, 0 |
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or die "$image: $!"; |
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|
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$ofs_l = 2048 - $ofs_l; |
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$ofs_l < $len or $ofs_l = $len; |
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sysread IMAGE, my $buf, $ofs_l; |
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$ofs_l == length $buf or $buf = "\x0" x $ofs_l; |
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|
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$self->send($buf); |
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|
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$len -= $ofs_l; |
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|
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$ofs_l = 0; |
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$ofs_h++; |
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} |
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} |
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|
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=head1 NAME |
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|
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attach-bincue - attach a .bin (cdrom image) containing an iso9660 fs to nbd |
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|
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=head1 SYNOPSIS |
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|
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attach-bincue -i iso9660.bin -m /mnt & # start server |
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|
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# kill server |
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umount /mnt |
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attach-bincue -d /dev/ndx # disconnect server |
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|
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=head1 DESCRIPTION |
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|
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With the C<-i> switch, attaches a C<.bin> file (containing an iso 9660 |
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filesystem image in the bin/cue "fileformat") to a nbd instance and serve |
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requests. |
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|
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Otherwise the nbd device specified with C<-d> is sent a disconnect |
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request, usually causing it to exit cleanly. |
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|
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Despite the name of this program, many more image formats can be attached |
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due to the guessing code - I have successfully mounted nero-nrg, |
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clonecd-img, blindwrite, uncompressed .fcd and a few more formats. |
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|
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=head1 ARGUMENTS |
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|
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=over 4 |
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|
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=item --image binfile |
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|
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Attached the given file to the network block device and serve requests. The command will only |
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exit on disconnect or any fatal errors. |
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|
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=item --offset bytes |
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The ISO image is offset by the given number of bytes. The default is to guess. Common values are C<24>, C<8> and C<0>. |
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=item --size blocksize |
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The blocksize in bytes. The default is to guess. Common values are C<2352>, C<2332> and C<2340>. |
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|
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=item --device /dev/ndx |
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The nbd device node to use. C<attach-bincue> automatically looks for a |
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unused one if this switch isn't given. |
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=item --verbose |
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Increase verbosity. With this switch, read requests will be logged to stdout. |
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=item --mount path |
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Try to mount the CD as iso image on the given path. |
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|
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=back |
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=head1 EXAMPLES |
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|
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Common combinations of offset and blocksize |
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|
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attach-bincue -b 2352 -o 24 |
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attach-bincue -b 2332 -o 8 |
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attach-bincue -b 2340 -o 0 |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <nbd@plan9.de>. |
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|
