lbmk/resources/scripts/update/blobs/download

#!/usr/bin/env sh

# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
# SPDX-FileCopyrightText: 2023 Leah Rowe <info@minifree.org>
# SPDX-License-Identifier: GPL-3.0-only

agent="Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101"

ec_url=""
ec_url_bkup=""
ec_hash=""
dl_hash=""
dl_url=""
dl_url_bkup=""
dl_path=""
e6400_vga_dl_hash=""
e6400_vga_dl_url=""
e6400_vga_dl_url_bkup=""
e6400_vga_offset=""
e6400_vga_romname=""

cbdir="coreboot/default"
cbcfgsdir="resources/coreboot"
boarddir=""
blobdir="blobs"
appdir="${blobdir}/app"
_7ztest="a"
mecleaner="$(pwd)/me_cleaner/me_cleaner.py"
e6400_unpack="$(pwd)/bios_extract/dell_inspiron_1100_unpacker.py"
me7updateparser="$(pwd)/resources/blobs/me7_update_parser.py"
kbc1126_ec_dump="$(pwd)/${cbdir}/util/kbc1126/kbc1126_ec_dump"
board=""
_b="" # board shorthand without e.g. _4mb (avoid duplication per flash size)

CONFIG_HAVE_MRC=""
CONFIG_HAVE_IFD_BIN=""
CONFIG_HAVE_ME_BIN=""
CONFIG_HAVE_GBE_BIN=""
CONFIG_KBC1126_FIRMWARE=""
CONFIG_BOARD_DELL_E6400=""
CONFIG_VGA_BIOS_FILE=""

main()
{
	board="${1}"
	boarddir="${cbcfgsdir}/${board}"

	exit_if_no_config="exit 0"
	for x in "${boarddir}"/config/*; do
		if [ -f "${x}" ]; then
			exit_if_no_config=""
		fi
	done
	eval "${exit_if_no_config}"

	if [ ! -d "${boarddir}" ]; then
		fail "Target not defined"
	elif [ ! -f "${boarddir}/board.cfg" ]; then
		fail "Target missing board.cfg"
	fi
	
	detect_firmware || exit 0
	scan_sources_config

	build_dependencies
	download_blobs
}

detect_firmware()
{
	set -- "${boarddir}/config/"*
	. ${1} 2>/dev/null
	. "${boarddir}/board.cfg"

	if [ "${CONFIG_HAVE_MRC}" = "y" ]; then
		needs="${needs} MRC"
	fi
	if [ "${CONFIG_HAVE_IFD_BIN}" = "y" ]; then
		needs="${needs} IFD"
	fi
	if [ "${CONFIG_HAVE_ME_BIN}" = "y" ]; then
		needs="${needs} ME"
	fi
	if [ "${CONFIG_HAVE_GBE_BIN}" = "y" ]; then
		needs="${needs} GBE"
	fi
	if [ "${CONFIG_KBC1126_FIRMWARE}" = "y" ]; then
		needs="${needs} EC"
	fi
	if [ "${CONFIG_BOARD_DELL_E6400}" = "y" ] \
			&& [ "${CONFIG_VGA_BIOS_FILE}" != "" ]; then
		needs="${needs} E6400VGA"
	fi
	if [ -z ${needs+x} ]; then
		printf 'No binary blobs needed for this board\n'
		return 1
	fi
	printf "Firmware needed for board %s: %s\n" ${board} ${needs}
}

scan_sources_config()
{
	# Shorthand (avoid duplicating configs per flash size)
	_b=${board%%_*mb}

	awkstr=" /\{.*${_b}.*}{/ {flag=1;next} /\}/{flag=0} flag { print }"

	while read -r line ; do
		case ${line} in
		EC_url*)
			set ${line}
			ec_url=http${2##*http}
			;;
		EC_url_bkup*)
			set ${line}
			ec_url_bkup=${2}
			;;
		EC_hash*)
			set ${line}
			ec_hash=${2}
			;;
		DL_hash*)
			set ${line}
			dl_hash=${2}
			;;
		DL_url*)
			set ${line}
			dl_url=http${2##*http}
			;;
		DL_url_bkup*)
			set ${line}
			dl_url_bkup=${2}
			;;
		E6400_VGA_DL_hash*)
			set ${line}
			e6400_vga_dl_hash=${2}
			;;
		E6400_VGA_DL_url*)
			set ${line}
			e6400_vga_dl_url=http${2##*http}
			;;
		E6400_VGA_DL_url_bkup*)
			set ${line}
			e6400_vga_dl_url_bkup=${2}
			;;
		E6400_VGA_offset*)
			set ${line}
			e6400_vga_offset=${2}
			;;
		E6400_VGA_romname*)
			set ${line}
			e6400_vga_romname=${2}
			;;
		esac
	done << EOF
	$(eval "awk '${awkstr}' resources/blobs/sources")
EOF
}

build_dependencies()
{
	if [ ! -d me_cleaner ]; then
		printf "downloading me_cleaner\n"
		./download me_cleaner || fail "could not download me_cleaner"
	fi
	if [ ! -d ${cbdir} ]; then
		printf "downloading coreboot\n"
		./download coreboot default \
				|| fail "could not download coreboot"
	fi
	if [ ! -d bios_extract ]; then
		printf "downloading bios_extract\n"
		./download bios_extract \
				|| fail "could not download bios_extract"
	fi
	if [ ! -f ${cbdir}/util/kbc1126/kbc1126_ec_dump ]; then
		printf "Building kbc1126_ec_dump from coreboot\n"
		make -BC ${cbdir}/util/kbc1126 \
				|| fail "could not build kbc1126_ec_dump"
	fi
	if [ ! -f "${cbdir}/util/ifdtool/ifdtool" ]; then
		printf "building ifdtool from coreboot\n"
		make -C ${cbdir}/util/ifdtool \
				|| fail 'could not build ifdtool'
	fi
}

download_blobs()
{
	for need in ${needs}; do
		case ${need} in
		*ME*)
			download_blob_intel_me || _failed="${_failed} me"
			;;
		*EC*)
			download_ec || _failed="${_failed} ec"
			;;
		*E6400VGA*)
			download_e6400vga || _failed="${_failed} e6400vga"
			;;
		*MRC*)
			./download mrc || _failed="${_failed} mrc"
			;;
		esac
	done
	
	if [ ! -z ${_failed+x} ]; then
		fail "failed to obtain ${_failed}\nTry manual extraction?"
	fi
}

download_blob_intel_me()
{
	printf "Downloading neutered ME for board: %s\n" ${board}

	fetch_update me || return 1
	extract_blob_intel_me || return 1
}

extract_blob_intel_me()
{
	printf "Extracting neutered ME for ${board}\n"

	_me_destination=${CONFIG_ME_BIN_PATH#../../}

	if [ ! -d "${_me_destination%/*}" ]; then
		mkdir -p ${_me_destination%/*}
	fi
	if [ -d "${appdir}" ]; then
		rm -r ${appdir}
	fi
	if [ -f "${_me_destination}" ]; then
		printf 'me already downloaded\n'
		return 0
	fi

	printf "Extracting and stripping Intel ME firmware\n"

	innoextract ${dl_path} -d ${blobdir} \
	|| 7z x ${dl_path} -o${appdir} \
		|| fail 'Could not extract vendor update' 

	bruteforce_extract_blob_intel_me "$(pwd)/${_me_destination}" \
			"$(pwd)/${appdir}" \
		|| fail "Could not extract Intel ME firmware"

	printf "Truncated and cleaned me output to ${_me_destination}\n"
}

# cursed, carcinogenic code. TODO rewrite it better
bruteforce_extract_blob_intel_me()
{
	_me_destination="${1}"
	cdir="${2}" # must be an absolute path, not relative

	if [ -f "${_me_destination}" ]; then
		return 0
	fi

	sdir="$(mktemp -d)"
	mkdir -p "${sdir}" || return 1

	(
	printf "Entering %s\n" "${cdir}"
	cd "${cdir}" || exit 1
	for i in *; do
		if [ -f "${_me_destination}" ]; then
			# me.bin found, so avoid needless further traversal
			break
		elif [ -L "${i}" ]; then
			# symlinks are a security risk, in this context
			continue
		elif [ -f "${i}" ]; then
			"${mecleaner}" -r -t -O "${sdir}/vendorfile" \
					-M "${_me_destination}" "${i}" \
				&& break # (we found me.bin)	
			"${mecleaner}" -r -t -O "${_me_destination}" "${i}" \
				&& break # (we found me.bin)
			"${me7updateparser}" -O ${_me_destination} "${i}" \
				&& break # (we found me.bin)
			_7ztest="${_7ztest}a"
			7z x "${i}" -o${_7ztest} || continue
			bruteforce_extract_blob_intel_me "${_me_destination}" \
					"${cdir}/${_7ztest}"
		elif [ -d "$i" ]; then
			bruteforce_extract_blob_intel_me "${_me_destination}" \
					"${cdir}/${i}"
		else
			printf "SKIPPING: %s\n" "${i}"
			continue
		fi
		cdir="${1}"
		cd "${cdir}"
	done
	)

	rm -Rf "${sdir}"

	if [ ! -f "${_me_destination}" ]; then
		printf "me.bin not found in vendor update for: %s\n" ${board}
		return 1
	fi
}

download_ec()
{
	printf "Downloading KBC1126 EC firmware for HP laptop\n"

	fetch_update ec || return 1
	extract_ec || return 1
}

extract_ec()
{
	printf "Extracting KBC1126 EC firmware for board: %s\n" ${board}

	_ec_destination=${CONFIG_KBC1126_FW1#../../}

	if [ ! -d "${_ec_destination%/*}" ]; then
		mkdir -p "${_ec_destination%/*}"
	fi
	if [ -d "${appdir}" ]; then
		rm -Rf "${appdir}"
	fi
	if [ -f "${_ec_destination}" ]; then
		printf "ec already downloaded\n"
		return 0
	fi

	unar "${dl_path}" -o "${appdir}"

	(
	cd "${appdir}/${dl_path##*/}"

	mv Rompaq/68*.BIN ec.bin
	if [ ! -f ec.bin ]; then
		unar -D ROM.CAB Rom.bin
		mv Rom.bin ec.bin
	fi
	if [ ! -f ec.bin ]; then
		printf "could not extract ec.bin for board '%s'" ${board} \
			1>&2
		fail "aborting the build. please audit blobutil carefully."
	fi

	"${kbc1126_ec_dump}" ec.bin
	)

	for i in 1 2; do
		if [ -f "${appdir}/${dl_path##*/}/ec.bin.fw${i}" ]; then
			continue
		fi
		printf "Not found: %s/%s/ec.bin.fw%s\n" \
				${appdir} ${dl_path##*/} ${i}
		printf "Could not extract EC firmware for: %s\n" \
				${board}
		return 1
	done

	cp "${appdir}/${dl_path##*/}"/ec.bin.fw* "${_ec_destination%/*}/"
}

download_e6400vga()
{
	printf "Downloading Nvidia VGA ROM for Dell Latitude E6400\n"

	fetch_update e6400vga || return 1
	extract_e6400vga || return 1
}

extract_e6400vga()
{
	printf "Extracting Nvidia VGA ROM for ${board}\n"

	_vga_destination=${CONFIG_VGA_BIOS_FILE#../../}

	if [ -f "${_vga_destination}" ]; then
		printf 'vga rom already downloaded\n'
		return 0
	fi
	if [ ! -d "${_vga_destination%/*}" ]; then
		mkdir -p ${_vga_destination%/*}
	fi	
	if [ -d "${appdir}" ]; then
		rm -r ${appdir}
	fi

	mkdir -p "${appdir}"
	mv "${dl_path}" "${appdir}"

	if [ "${e6400_vga_offset}" = "" ]; then
		printf "E6400 VGA offset not defined\n"
		return 1
	elif [ "${e6400_vga_romname}" = "" ]; then
		printf "E6400 VGA ROM name not defined\n"
		return 1
	fi

	(
	cd "${appdir}"
	tail -c +${e6400_vga_offset} "${dl_path##*/}" \
			| gunzip > bios.bin
	if [ ! -f "bios.bin" ]; then
		fail 'Could not extract bios.bin from Dell E6400 update'
	fi
	"${e6400_unpack}" bios.bin || printf "TODO: fix dell extract util\n"
	if [ ! -f "${e6400_vga_romname}" ]; then
		fail 'Could not extract VGA ROM from Dell E6400 BIOS update'
	fi
	)

	cp "${appdir}"/"${e6400_vga_romname}" "${_vga_destination}"

	printf "E6400 Nvidia ROM saved to: %s\n" "${_vga_destination}"
}

fetch_update()
{
	printf "Fetching vendor update for board: %s\n" ${board}

	fw_type="${1}"
	dl=""
	dl_bkup=""
	dlsum=""
	if [ "${fw_type}" = "me" ]; then
		dl=${dl_url}
		dl_bkup=${dl_url_bkup}
		dlsum=${dl_hash}
	elif [ "${fw_type}" = "ec" ]; then
		dl=${ec_url}
		dl_bkup=${ec_url_bkup}
		dlsum=${ec_hash}
	elif [ "${fw_type}" = "e6400vga" ]; then
		dl=${e6400_vga_dl_url}
		dl_bkup=${e6400_vga_dl_url_bkup}
		dlsum=${e6400_vga_dl_hash}
	else
		printf "Unsupported download type: %s\n" ${fw_type}
		return 1
	fi

	if [ -z "${dl_url+x}" ] && [ "${fw_type}" != "e6400vga" ]; then
		printf "No vendor update specified for board: %s\n" ${board}
		return 1
	fi

	dl_path=${blobdir}/cache/${dlsum}
	mkdir -p ${blobdir}/cache

	vendor_checksum ${dlsum} || \
		wget -U "${agent}" ${dl} -O ${dl_path} \
		|| wget -U "${agent}" ${dl_bkup} -O ${dl_path}

	vendor_checksum ${dlsum} || fail \
		"Cannot guarantee intergity of vendor update for: ${board}"
}

vendor_checksum()
{
	if [ ! -f "${dl_path}" ]; then
		printf "Vendor update not found on disk for: %s\n" ${board}
		return 1
	elif [ "$(sha1sum ${dl_path} | awk '{print $1}')" != "${1}" ]; then
		printf "Bad checksum on vendor update for: %s\n" ${board}
		return 1
	fi
}

fail()
{
	printf "\nERROR: $@\n"
	exit 1
}

main $@