3267ce750e
Since BusyBox 1.25.0 dd command supports iflag=skip_bytes which allows skipping requested amount of bytes without reducing blocksize. Thanks to this we can leave default blocksize and let dd work more efficiently. On Netgear R6250 "dd skip=58 iflag=skip_bytes" can be 5 times faster than "dd bs=58 skip=1" when extracting TRX out of CHK. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
335 lines
8.4 KiB
Bash
335 lines
8.4 KiB
Bash
RAMFS_COPY_BIN='osafeloader oseama'
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PART_NAME=firmware
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# $(1): file to read magic from
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# $(2): offset in bytes
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get_magic_long_at() {
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dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%02x"'
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}
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platform_flash_type() {
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# On NAND devices "rootfs" is UBI volume, so won't be find in /proc/mtd
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grep -q "\"rootfs\"" /proc/mtd && {
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echo "serial"
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return
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}
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echo "nand"
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}
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platform_expected_image() {
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local machine=$(board_name)
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case "$machine" in
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"dlink,dir-885l") echo "seama wrgac42_dlink.2015_dir885l"; return;;
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"netgear,r6250v1") echo "chk U12H245T00_NETGEAR"; return;;
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"netgear,r6300v2") echo "chk U12H240T00_NETGEAR"; return;;
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"netgear,r7000") echo "chk U12H270T00_NETGEAR"; return;;
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"netgear,r7900") echo "chk U12H315T30_NETGEAR"; return;;
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"netgear,r8000") echo "chk U12H315T00_NETGEAR"; return;;
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"netgear,r8500") echo "chk U12H334T00_NETGEAR"; return;;
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"tplink,archer-c9-v1") echo "safeloader"; return;;
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esac
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}
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platform_identify() {
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local magic
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magic=$(get_magic_long "$1")
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case "$magic" in
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"48445230")
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echo "trx"
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return
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;;
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"2a23245e")
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echo "chk"
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return
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;;
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"5ea3a417")
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echo "seama"
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return
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;;
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esac
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magic=$(get_magic_long_at "$1" 14)
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[ "$magic" = "55324e44" ] && {
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echo "cybertan"
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return
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}
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if osafeloader info "$1" > /dev/null 2>&1; then
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echo "safeloader"
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return
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fi
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echo "unknown"
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}
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platform_check_image() {
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[ "$#" -gt 1 ] && return 1
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local file_type=$(platform_identify "$1")
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local magic
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local error=0
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case "$file_type" in
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"chk")
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local header_len=$((0x$(get_magic_long_at "$1" 4)))
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local board_id_len=$(($header_len - 40))
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local board_id=$(dd if="$1" skip=40 bs=1 count=$board_id_len 2>/dev/null | hexdump -v -e '1/1 "%c"')
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local dev_board_id=$(platform_expected_image)
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echo "Found CHK image with device board_id $board_id"
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[ -n "$dev_board_id" -a "chk $board_id" != "$dev_board_id" ] && {
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echo "Firmware board_id doesn't match device board_id ($dev_board_id)"
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error=1
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}
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if ! otrx check "$1" -o "$header_len"; then
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echo "No valid TRX firmware in the CHK image"
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error=1
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fi
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;;
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"cybertan")
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local pattern=$(dd if="$1" bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%c"')
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local dev_pattern=$(platform_expected_image)
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echo "Found CyberTAN image with device pattern: $pattern"
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[ -n "$dev_pattern" -a "cybertan $pattern" != "$dev_pattern" ] && {
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echo "Firmware pattern doesn't match device pattern ($dev_pattern)"
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error=1
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}
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if ! otrx check "$1" -o 32; then
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echo "No valid TRX firmware in the CyberTAN image"
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error=1
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fi
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;;
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"safeloader")
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;;
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"seama")
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local img_signature=$(oseama info "$1" | grep "Meta entry:.*signature=" | sed "s/.*=//")
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local dev_signature=$(platform_expected_image)
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echo "Found Seama image with device signature: $img_signature"
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[ -n "$dev_signature" -a "seama $img_signature" != "$dev_signature" ] && {
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echo "Firmware signature doesn't match device signature ($dev_signature)"
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error=1
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}
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$(oseama info "$1" -e 0 | grep -q "Meta entry:.*type=firmware") || {
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echo "Seama container doesn't have firmware entity"
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error=1
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}
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;;
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"trx")
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local expected=$(platform_expected_image)
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[ "$expected" == "safeloader" ] && {
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echo "This device expects SafeLoader format and may not work with TRX"
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error=1
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}
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if ! otrx check "$1"; then
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echo "Invalid (corrupted?) TRX firmware"
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error=1
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fi
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;;
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*)
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echo "Invalid image type. Please use only .trx files"
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error=1
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;;
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esac
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return $error
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}
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# $(1): image for upgrade (with possible extra header)
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# $(2): offset of trx in image
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platform_pre_upgrade_trx() {
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local dir="/tmp/sysupgrade-bcm53xx"
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local trx="$1"
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local offset="$2"
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# Extract partitions from trx
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rm -fR $dir
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mkdir -p $dir
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otrx extract "$trx" \
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${offset:+-o $offset} \
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-1 $dir/kernel \
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-2 $dir/root
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[ $? -ne 0 ] && {
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echo "Failed to extract TRX partitions."
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return
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}
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# Firmwares without UBI image should be flashed "normally"
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local root_type=$(identify $dir/root)
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[ "$root_type" != "ubi" ] && {
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echo "Provided firmware doesn't use UBI for rootfs."
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return
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}
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# Prepare TRX file with just a kernel that will replace current one
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local linux_length=$(grep "\"linux\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
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[ -z "$linux_length" ] && {
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echo "Unable to find \"linux\" partition size"
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exit 1
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}
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linux_length=$((0x$linux_length))
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local kernel_length=$(wc -c $dir/kernel | cut -d ' ' -f 1)
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[ $kernel_length -gt $linux_length ] && {
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echo "New kernel doesn't fit \"linux\" partition."
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return
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}
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rm -f /tmp/null.bin
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rm -f /tmp/kernel.trx
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touch /tmp/null.bin
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otrx create /tmp/kernel.trx \
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-f $dir/kernel -b $(($linux_length + 28)) \
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-f /tmp/null.bin
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[ $? -ne 0 ] && {
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echo "Failed to create simple TRX with new kernel."
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return
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}
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# Prepare UBI image (drop unwanted extra blocks)
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local ubi_length=0
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while [ "$(dd if=$dir/root skip=$ubi_length bs=1 count=4 2>/dev/null)" = "UBI#" ]; do
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ubi_length=$(($ubi_length + 131072))
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done
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dd if=$dir/root of=/tmp/root.ubi bs=131072 count=$((ubi_length / 131072)) 2>/dev/null
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[ $? -ne 0 ] && {
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echo "Failed to prepare new UBI image."
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return
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}
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# Flash
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mtd write /tmp/kernel.trx firmware
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nand_do_upgrade /tmp/root.ubi
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}
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platform_pre_upgrade_seama() {
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local dir="/tmp/sysupgrade-bcm53xx"
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local seama="$1"
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local tmp
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# Extract Seama entity from Seama seal
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rm -fR $dir
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mkdir -p $dir
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oseama extract "$seama" \
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-e 0 \
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-o $dir/seama.entity
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[ $? -ne 0 ] && {
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echo "Failed to extract Seama entity."
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return
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}
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local entity_size=$(wc -c $dir/seama.entity | cut -d ' ' -f 1)
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local ubi_offset=0
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tmp=0
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while [ 1 ]; do
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[ $tmp -ge $entity_size ] && break
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[ "$(dd if=$dir/seama.entity skip=$tmp bs=1 count=4 2>/dev/null)" = "UBI#" ] && {
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ubi_offset=$tmp
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break
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}
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tmp=$(($tmp + 131072))
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done
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[ $ubi_offset -eq 0 ] && {
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echo "Failed to find UBI in Seama entity."
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return
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}
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local ubi_length=0
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while [ "$(dd if=$dir/seama.entity skip=$(($ubi_offset + $ubi_length)) bs=1 count=4 2>/dev/null)" = "UBI#" ]; do
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ubi_length=$(($ubi_length + 131072))
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done
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dd if=$dir/seama.entity of=$dir/kernel.seama bs=131072 count=$(($ubi_offset / 131072)) 2>/dev/null
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dd if=$dir/seama.entity of=$dir/root.ubi bs=131072 skip=$(($ubi_offset / 131072)) count=$(($ubi_length / 131072)) 2>/dev/null
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# Flash
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local kernel_size=$(sed -n 's/mtd[0-9]*: \([0-9a-f]*\).*"\(kernel\|linux\)".*/\1/p' /proc/mtd)
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mtd write $dir/kernel.seama firmware
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mtd ${kernel_size:+-c 0x$kernel_size} fixseama firmware
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nand_do_upgrade $dir/root.ubi
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}
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platform_pre_upgrade() {
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local file_type=$(platform_identify "$1")
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[ "$(platform_flash_type)" != "nand" ] && return
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# Find trx offset
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case "$file_type" in
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"chk") platform_pre_upgrade_trx "$1" $((0x$(get_magic_long_at "$1" 4)));;
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"cybertan") platform_pre_upgrade_trx "$1" 32;;
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"seama") platform_pre_upgrade_seama "$1";;
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"trx") platform_pre_upgrade_trx "$1";;
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esac
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}
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platform_trx_from_chk_cmd() {
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local header_len=$((0x$(get_magic_long_at "$1" 4)))
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echo -n dd skip=$header_len iflag=skip_bytes
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}
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platform_trx_from_cybertan_cmd() {
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echo -n dd skip=32 iflag=skip_bytes
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}
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platform_img_from_safeloader() {
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local dir="/tmp/sysupgrade-bcm53xx"
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# Extract partitions from SafeLoader
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rm -fR $dir
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mkdir -p $dir
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osafeloader extract "$1" \
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-p "os-image" \
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-o $dir/os-image
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osafeloader extract "$1" \
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-p "file-system" \
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-o $dir/file-system
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mtd write $dir/file-system rootfs
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echo -n $dir/os-image
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}
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platform_img_from_seama() {
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local dir="/tmp/sysupgrade-bcm53xx"
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local offset=$(oseama info "$1" -e 0 | grep "Entity offset:" | sed "s/.*:\s*//")
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local size=$(oseama info "$1" -e 0 | grep "Entity size:" | sed "s/.*:\s*//")
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# Busybox doesn't support required iflag-s
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# echo -n dd iflag=skip_bytes,count_bytes skip=$offset count=$size
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rm -fR $dir
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mkdir -p $dir
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dd if="$1" of=$dir/image-noheader.bin bs=$offset skip=1
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dd if=$dir/image-noheader.bin of=$dir/image-entity.bin bs=$size count=1
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echo -n $dir/image-entity.bin
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}
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platform_do_upgrade() {
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local file_type=$(platform_identify "$1")
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local trx="$1"
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local cmd=
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[ "$(platform_flash_type)" == "nand" ] && {
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echo "Writing whole image to NAND flash. All erase counters will be lost."
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}
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case "$file_type" in
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"chk") cmd=$(platform_trx_from_chk_cmd "$trx");;
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"cybertan") cmd=$(platform_trx_from_cybertan_cmd "$trx");;
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"safeloader") trx=$(platform_img_from_safeloader "$trx");;
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"seama") trx=$(platform_img_from_seama "$trx");;
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esac
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default_do_upgrade "$trx" "$cmd"
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}
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