68 lines
1.8 KiB
Bash
68 lines
1.8 KiB
Bash
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#!/bin/sh
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#
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# Copyright (C) 2018 Oceanic Systems (UK) Ltd
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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# Maintained by: Ryan Pannell <ryan [at] o s u k l .com> <github.com/Escalion>
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#
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# Write Linksys signature for factory image
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# This is appended to the factory image and is tested by the Linksys Upgrader - as observed in civic.
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# The footer is 256 bytes. The format is:
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# .LINKSYS. This is detected by the Linksys upgrader before continuing with upgrade. (9 bytes)
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# <VERSION> The version number of upgrade. Not checked so use arbitary value (8 bytes)
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# <TYPE> Model of target device, padded (0x20) to (15 bytes)
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# <CRC> CRC checksum of the image to flash (8 byte)
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# <padding> Padding (0x20) (7 bytes)
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# <signature> Signature of signer. Not checked so use Arbitary value (16 bytes)
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# <padding> Padding (0x00) (192 bytes)
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# 0x0A (1 byte)
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## version history
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# * version 1: initial commit
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set -e
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ME="${0##*/}"
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usage() {
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echo "Usage: $ME <type> <in filename>"
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[ "$IMG_OUT" ] && rm -f "$IMG_OUT"
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exit 1
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}
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[ "$#" -lt 3 ] && usage
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TYPE=$1
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tmpdir="$( mktemp -d 2> /dev/null )"
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if [ -z "$tmpdir" ]; then
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# try OSX signature
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tmpdir="$( mktemp -t 'ubitmp' -d )"
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fi
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if [ -z "$tmpdir" ]; then
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exit 1
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fi
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trap "rm -rf $tmpdir" EXIT
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IMG_TMP_OUT="${tmpdir}/out"
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IMG_IN=$2
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IMG_OUT="${IMG_IN}.new"
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[ ! -f "$IMG_IN" ] && echo "$ME: Not a valid image: $IMG_IN" && usage
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dd if="${IMG_IN}" of="${IMG_TMP_OUT}"
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CRC=$(printf "%08X" $(dd if="${IMG_IN}" bs=$(stat -c%s "${IMG_IN}") count=1|cksum| cut -d ' ' -f1))
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printf ".LINKSYS.01000409%-15s%-8s%-7s%-16s" "${TYPE}" "${CRC}" "" "K0000000F0246434" >> "${IMG_TMP_OUT}"
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dd if=/dev/zero bs=1 count=192 conv=notrunc >> "${IMG_TMP_OUT}"
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printf '\12' >> "${IMG_TMP_OUT}"
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cp "${IMG_TMP_OUT}" "${IMG_OUT}"
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