# vim: set ft=sh:
# TODO this one needs some work to work with lots of different
#       encryption schemes
run_hook ()
{
    if ! [ "$ENCRYPTRUN" = "1" ]; then
        /sbin/modprobe -a -q dm-crypt >/dev/null 2>&1
        if [ -e "/sys/class/misc/device-mapper" ]; then
            if [ ! -c "/dev/mapper/control" ]; then
                read dev_t < /sys/class/misc/device-mapper/dev
                /bin/mknod "/dev/mapper/control" c $(/bin/replace "${dev_t}" ':')
            fi
            [ "${quiet}" = "y" ] && CSQUIET=">/dev/null"

            # Get keyfile if specified
             ckeyfile="/crypto_keyfile.bin"
            if [ "x${cryptkey}" != "x" ]; then
                set -- $(/bin/replace "${cryptkey}" ':'); ckdev=$1; ckarg1=$2; ckarg2=$3
	        if poll_device "${ckdev}" ${rootdelay}; then
                    case ${ckarg1} in
                        *[!0-9]*)
                            # Use a file on the device
                            # ckarg1 is not numeric: ckarg1=filesystem, ckarg2=path
                            mkdir /ckey
                            mount -r -t ${ckarg1} ${ckdev} /ckey
                            dd if=/ckey/${ckarg2} of=${ckeyfile} >/dev/null 2>&1
                            umount /ckey
                            ;;
                        *)
                            # Read raw data from the block device
                            # ckarg1 is numeric: ckarg1=offset, ckarg2=length
                            dd if=${ckdev} of=${ckeyfile} bs=1 skip=${ckarg1} count=${ckarg2} >/dev/null 2>&1
                            ;;
                    esac
                 fi
                [ ! -f ${ckeyfile} ] && echo "Keyfile could not be opened. Reverting to passphrase."
            fi

            if [ -n "${cryptdevice}" ]; then
	        DEPRECATED_CRYPT=0
                set -- $(/bin/replace "${cryptdevice}" ':'); cryptdev="$1"; cryptname="$2";
            else
                DEPRECATED_CRYPT=1
                cryptdev="${root}"
                cryptname="root"
            fi

            warn_deprecated() {
                echo "The syntax 'root=${root}' where '${root}' is an encrypted volume is deprecated"
                echo "Use 'cryptdevice=${root}:root root=/dev/mapper/root' instead."
            }

            if  poll_device "${cryptdev}" ${rootdelay}; then
                if /usr/sbin/cryptsetup isLuks ${cryptdev} >/dev/null 2>&1; then
                    [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated
                    dopassphrase=1
                    # If keyfile exists, try to use that
                    if [ -f ${ckeyfile} ]; then
                        if eval /usr/sbin/cryptsetup --key-file ${ckeyfile} luksOpen ${cryptdev} ${cryptname} ${CSQUIET}; then
                            dopassphrase=0
                        else
                            echo "Invalid keyfile. Reverting to passphrase."
                        fi
                    fi
                    # Ask for a passphrase
                    if [ ${dopassphrase} -gt 0 ]; then
                        echo ""
                        echo "A password is required to access the ${cryptname} volume:"

                        #loop until we get a real password
                        while ! eval /usr/sbin/cryptsetup luksOpen ${cryptdev} ${cryptname} ${CSQUIET}; do
                            sleep 2;
                        done
                    fi
                    if [ -e "/dev/mapper/${cryptname}" ]; then
                        if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
                            export root="/dev/mapper/root"
                        fi
                    else
                        err "Password succeeded, but ${cryptname} creation failed, aborting..."
                        exit 1
                    fi
                elif [ "x${crypto}" != "x" ]; then
	            [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated
                    do_oldcrypto ()
                    {
                        if [ $# -ne 5 ]; then
                            err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip"
                            err "Non-LUKS decryption not attempted..."
                            return 1
                        fi
                        exe="/usr/sbin/cryptsetup create ${cryptname} ${cryptdev}"
                        [ "x$(eval echo ${1})" != "x" ] && exe="${exe} --hash \"$(eval echo ${1})\""
                        [ "x$(eval echo ${2})" != "x" ] && exe="${exe} --cipher \"$(eval echo ${2})\""
                        [ "x$(eval echo ${3})" != "x" ] && exe="${exe} --key-size \"$(eval echo ${3})\""
                        [ "x$(eval echo ${4})" != "x" ] && exe="${exe} --offset \"$(eval echo ${4})\""
                        [ "x$(eval echo ${5})" != "x" ] && exe="${exe} --skip \"$(eval echo ${5})\""
                        if [ -f ${ckeyfile} ]; then
                            exe="${exe} --key-file ${ckeyfile}"
                        else
                            exe="${exe} --verify-passphrase"
                            echo ""
                            echo "A password is required to access the ${cryptname} volume:"
                        fi
                        eval "${exe} ${CSQUIET}"
                    }

                    msg "Non-LUKS encrypted device found..."
                    do_oldcrypto $(/bin/replace -q "${crypto}" ':')

                    if [ $? -ne 0 ]; then
                        err "Non-LUKS device decryption failed. verify format: "
                        err "      crypto=hash:cipher:keysize:offset:skip"
                        exit 1
                    fi
                    if [ -e "/dev/mapper/${cryptname}" ]; then
                        if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
                            export root="/dev/mapper/root"
                        fi
                    else
                        err "Password succeeded, but ${cryptname} creation failed, aborting..."
                        exit 1
                    fi
                else
                    err "Failed to open encryption mapping: The device ${cryptdev} is not a LUKS volume and the crypto= paramater was not specified."
                fi
            fi
            nuke ${ckeyfile}
        fi
    else
        msg ":: Skipping already run by arch_root_advanced hook..."
    fi
}
