Utilities to unpack QNAP firmware images and QPKG files
This script unpacks a firmware image. The firmware image can be passed in the original form (*.img), decrypted (*.tgz), or as a source directory.
Usage:
./extract_qnap_fw.sh firmware.img destdir
./extract_qnap_fw.sh firmware.img.tgz destdir
./extract_qnap_fw.sh srcdir destdir
this results in:
destdir/fw files extracted from the firmware.img
destdir/sysroot unpacked initrd/initramfs, rootfs2, rootfs_ext
destdir/qpkg unpacked qpkg.tar
This script unpacks a QPKG file.
Usage:
./extract_qpkg.sh package.qpkg [destdir]
Another way to do this would be using the QDK tool.
The max-boehm script does not work on macOS for two reasons:
Reason 1:
SKIP=`wc -c < $DEST/header_script`
On macOS, wc -c has a leading tab.
The solution would be:
SKIP=$(sed -n 's/script_len=\(.*\)/\1/p' $DEST/header_script)
Reason 2:
od -t x1 -w4 -Ad -v $DEST/payload | grep '1f 8b 08 00' | awk '{print $1}'
The macOS version of od does not support the parameter -w (--width).
A solution would be:
printf "%d\n" $(hexdump -C $DEST/payload | grep '1f 8b 08 00' | awk '{print "0x"$1}')
hexdump displays the position of the grep'ped string in hex.
'print "0x"$1' will output the position with a leading '0x'
'printf "%d"' will convert a hexadecimal to decimal number
The extract.qpkg script has been amended.