#!/bin/sh

. /lib/functions.sh
. /lib/functions/system.sh
. /usr/share/libubox/jshn.sh

# initialize defaults
export MTD_ARGS=""
export MTD_CONFIG_ARGS=""
export INTERACTIVE=0
export VERBOSE=1
export SAVE_CONFIG=1
export SAVE_OVERLAY=0
export SAVE_OVERLAY_PATH=
export SAVE_PARTITIONS=1
export SAVE_INSTALLED_PKGS=0
export SKIP_UNCHANGED=0
export CONF_IMAGE=
export CONF_BACKUP_LIST=0
export CONF_BACKUP=
export CONF_RESTORE=
export IGNORE_MINOR_COMPAT=0
export NEED_IMAGE=
export HELP=0
export FORCE=0
export TEST=0
export UMOUNT_ETCBACKUP_DIR=0

# parse options
while [ -n "$1" ]; do
	case "$1" in
		-i) export INTERACTIVE=1;;
		-v) export VERBOSE="$(($VERBOSE + 1))";;
		-q) export VERBOSE="$(($VERBOSE - 1))";;
		-n) export SAVE_CONFIG=0;;
		-c) export SAVE_OVERLAY=1 SAVE_OVERLAY_PATH=/etc;;
		-o) export SAVE_OVERLAY=1 SAVE_OVERLAY_PATH=/;;
		-p) export SAVE_PARTITIONS=0;;
		-k) export SAVE_INSTALLED_PKGS=1;;
		-u) export SKIP_UNCHANGED=1;;
		-b|--create-backup) export CONF_BACKUP="$2" NEED_IMAGE=1; shift;;
		-r|--restore-backup) export CONF_RESTORE="$2" NEED_IMAGE=1; shift;;
		-l|--list-backup) export CONF_BACKUP_LIST=1;;
		-f) export CONF_IMAGE="$2"; shift;;
		-F|--force) export FORCE=1;;
		-T|--test) export TEST=1;;
		-h|--help) export HELP=1; break;;
		--ignore-minor-compat-version) export IGNORE_MINOR_COMPAT=1;;
		-*)
			echo "Invalid option: $1" >&2
			exit 1
		;;
		*) break;;
	esac
	shift;
done

#we do not support force update
export FORCE=0
export CONFFILES=/tmp/sysupgrade.conffiles
export CONF_TAR=/tmp/sysupgrade.tgz
export ETCBACKUP_DIR=/etc/backup
export INSTALLED_PACKAGES=${ETCBACKUP_DIR}/installed_packages.txt

IMAGE="$1"

[ -z "$IMAGE" -a -z "$NEED_IMAGE" -a $CONF_BACKUP_LIST -eq 0 -o $HELP -gt 0 ] && {
	cat <<EOF
Usage: $0 [<upgrade-option>...] <image file or URL>
       $0 [-q] [-i] [-c] [-u] [-o] [-k] <backup-command> <file>

upgrade-option:
	-f <config>  restore configuration from .tar.gz (file or url)
	-i           interactive mode
	-c           attempt to preserve all changed files in /etc/
	-o           attempt to preserve all changed files in /, except those
	             from packages but including changed confs.
	-u           skip from backup files that are equal to those in /rom
	-n           do not save configuration over reflash
	-p           do not attempt to restore the partition table after flash.
	-k           include in backup a list of current installed packages at
	             $INSTALLED_PACKAGES
	-T | --test
	             Verify image and config .tar.gz but do not actually flash.
	-F | --force
	             Flash image even if image checks fail, this is dangerous!
	--ignore-minor-compat-version
		     Flash image even if the minor compat version is incompatible.
	-q           less verbose
	-v           more verbose
	-h | --help  display this help

backup-command:
	-b | --create-backup <file>
	             create .tar.gz of files specified in sysupgrade.conf
	             then exit. Does not flash an image. If file is '-',
	             i.e. stdout, verbosity is set to 0 (i.e. quiet).
	-r | --restore-backup <file>
	             restore a .tar.gz created with sysupgrade -b
	             then exit. Does not flash an image. If file is '-',
	             the archive is read from stdin.
	-l | --list-backup
	             list the files that would be backed up when calling
	             sysupgrade -b. Does not create a backup file.

EOF
	exit 1
}

[ -n "$IMAGE" -a -n "$NEED_IMAGE" ] && {
	cat <<-EOF
		-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.
		Do not specify both -b|-r and a firmware image.
	EOF
	exit 1
}

# prevent messages from clobbering the tarball when using stdout
[ "$CONF_BACKUP" = "-" ] && export VERBOSE=0


list_conffiles() {
	awk '
		BEGIN { conffiles = 0 }
		/^Conffiles:/ { conffiles = 1; next }
		!/^ / { conffiles = 0; next }
		conffiles == 1 { print }
	' /usr/lib/opkg/status
}

list_changed_conffiles() {
	# Cannot handle spaces in filenames - but opkg cannot either...
	list_conffiles | while read file csum; do
		[ -r "$file" ] || continue

		echo "${csum}  ${file}" | busybox sha256sum -sc - || echo "$file"
	done
}

list_static_conffiles() {
	local filter=$1

	find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
		/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
		\( -type f -o -type l \) $filter 2>/dev/null
}

add_conffiles() {
	local file="$1"

	( list_static_conffiles "$find_filter"; list_changed_conffiles ) |
		sort -u > "$file"
	return 0
}

add_overlayfiles() {
	local file="$1"

	local packagesfiles=$1.packagesfiles
	touch "$packagesfiles"

	if [ "$SAVE_OVERLAY_PATH" = / ]; then
		local conffiles=$1.conffiles
		local keepfiles=$1.keepfiles

		list_conffiles | cut -f2 -d ' ' | sort -u > "$conffiles"

		# backup files from /etc/sysupgrade.conf and /lib/upgrade/keep.d, but
		# ignore those aready controlled by opkg conffiles
		list_static_conffiles | sort -u |
			grep -h -v -x -F -f $conffiles > "$keepfiles"

		# backup conffiles, but only those changed if '-u'
		[ $SKIP_UNCHANGED = 1 ] &&
			list_changed_conffiles | sort -u > "$conffiles"

		# do not backup files from packages, except those listed
		# in conffiles and keep.d
		{
			find /usr/lib/opkg/info -type f -name "*.list" -exec cat {} \;
			find /usr/lib/opkg/info -type f -name "*.control" -exec sed \
				-ne '/^Alternatives/{s/^Alternatives: //;s/, /\n/g;p}' {} \; |
				cut -f2 -d:
		} |  grep -v -x -F -f $conffiles |
		     grep -v -x -F -f $keepfiles | sort -u > "$packagesfiles"
		rm -f "$keepfiles" "$conffiles"
	fi

	# busybox grep bug when file is empty
	[ -s "$packagesfiles" ] || echo > $packagesfiles

	( cd /overlay/upper/; find .$SAVE_OVERLAY_PATH \( -type f -o -type l \) $find_filter | sed \
		-e 's,^\.,,' \
		-e '\,^/etc/board.json$,d' \
		-e '\,/[^/]*-opkg$,d' \
		-e '\,^/etc/urandom.seed$,d' \
		-e "\,^$INSTALLED_PACKAGES$,d" \
		-e '\,^/usr/lib/opkg/.*,d' \
	) | grep -v -x -F -f $packagesfiles > "$file"

	rm -f "$packagesfiles"

	return 0
}

include /lib/platform.sh

if [ $SAVE_OVERLAY = 1 ]; then
	[ ! -d /overlay/upper/etc ] && {
		echo "Cannot find '/overlay/upper/etc', required for '-c'" >&2
		exit 1
	}
	sysupgrade_init_conffiles="add_overlayfiles"
else
	sysupgrade_init_conffiles="add_conffiles"
fi

find_filter=""
if [ $SKIP_UNCHANGED = 1 ]; then
	[ ! -d /rom/ ] && {
		echo "'/rom/' is required by '-u'"
		exit 1
	}
	find_filter='( ( -exec test -e /rom/{} ; -exec cmp -s /{} /rom/{} ; ) -o -print )'
fi

include /lib/upgrade

do_save_conffiles() {
	local conf_tar="$1"

	[ "$(rootfs_type)" = "tmpfs" ] && {
		echo "Cannot save config while running from ramdisk." >&2
		ask_bool 0 "Abort" && exit
		rm -f "$conf_tar"
		return 0
	}
	run_hooks "$CONFFILES" $sysupgrade_init_conffiles
	ask_bool 0 "Edit config file list" && vi "$CONFFILES"

	if [ "$SAVE_INSTALLED_PKGS" -eq 1 ]; then
		echo "${INSTALLED_PACKAGES}" >> "$CONFFILES"
		mkdir -p "$ETCBACKUP_DIR"
		# Avoid touching filesystem on each backup
		RAMFS="$(mktemp -d -t sysupgrade.XXXXXX)"
		mkdir -p "$RAMFS/upper" "$RAMFS/work"
		mount -t overlay overlay -o lowerdir=$ETCBACKUP_DIR,upperdir=$RAMFS/upper,workdir=$RAMFS/work $ETCBACKUP_DIR &&
			UMOUNT_ETCBACKUP_DIR=1 || {
				echo "Cannot mount '$ETCBACKUP_DIR' as tmpfs to avoid touching disk while saving the list of installed packages." >&2
				ask_bool 0 "Abort" && exit
			}

		# Format: pkg-name<TAB>{rom,overlay,unkown}
		# rom is used for pkgs in /rom, even if updated later
		find /usr/lib/opkg/info -name "*.control" \( \
			\( -exec test -f /rom/{} \; -exec echo {} rom \; \) -o \
			\( -exec test -f /overlay/upper/{} \; -exec echo {} overlay \; \) -o \
			\( -exec echo {} unknown \; \) \
			\) | sed -e 's,.*/,,;s/\.control /\t/' > ${INSTALLED_PACKAGES}
	fi

	v "Saving config files..."
	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
	tar c${TAR_V}zf "$conf_tar" -T "$CONFFILES" 2>/dev/null
	if [ "$?" -ne 0 ]; then
		echo "Failed to create the configuration backup."
		rm -f "$conf_tar"
		exit 1
	fi

	[ "$UMOUNT_ETCBACKUP_DIR" -eq 1 ] && {
		umount "$ETCBACKUP_DIR"
		rm -rf "$RAMFS"
	}
	rm -f "$CONFFILES"
}

if [ $CONF_BACKUP_LIST -eq 1 ]; then
	run_hooks "$CONFFILES" $sysupgrade_init_conffiles
	[ "$SAVE_INSTALLED_PKGS" -eq 1 ] && echo ${INSTALLED_PACKAGES} >> "$CONFFILES"
	cat "$CONFFILES"
	rm -f "$CONFFILES"
	exit 0
fi

if [ -n "$CONF_BACKUP" ]; then
	do_save_conffiles "$CONF_BACKUP"
	exit $?
fi

if [ -n "$CONF_RESTORE" ]; then
	if [ "$CONF_RESTORE" != "-" ] && [ ! -f "$CONF_RESTORE" ]; then
		echo "Backup archive '$CONF_RESTORE' not found." >&2
		exit 1
	fi

	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
	v "Restoring config files..."
	#backup device serial number, id, and key
	if [[ -e /etc/config/percepxion ]]; then
		CONSOLEFLOW_SERIAL_NUM=`uci get percepxion.Basic.Serial_Number | tr -d '\n'`
		CONSOLEFLOW_ID=`uci get percepxion.Basic.Device_ID`
		CONSOLEFLOW_KEY=`uci get percepxion.Basic.Device_Key`
	fi
	tar -C / -x${TAR_V}zf "$CONF_RESTORE"

	# If user restores old backup file the rename/move as a percepxion
	if [ -f "/etc/config/consoleflow" ]; then
		mv /etc/config/consoleflow /etc/config/percepxion
	fi

	if [[ -e /etc/config/percepxion ]]; then
		#restore device serial number, id, and key
		#for some reason the uci set does not work
		sed -i "/option Device_ID /c\\\toption Device_ID '$CONSOLEFLOW_ID'" /etc/config/percepxion
		sed -i "/option Device_Key /c\\\toption Device_Key '$CONSOLEFLOW_KEY'" /etc/config/percepxion
		sed -i "/option Serial_Number /c\\\toption Serial_Number '$CONSOLEFLOW_SERIAL_NUM'" /etc/config/percepxion
	fi
	exit $?
fi

type platform_check_image >/dev/null 2>/dev/null || {
	echo "Firmware upgrade is not implemented for this platform." >&2
	exit 1
}

case "$IMAGE" in
	http://*|\
	https://*)
		wget -O/tmp/sysupgrade.img "$IMAGE" || exit 1
		IMAGE=/tmp/sysupgrade.img
		;;
esac

IMAGE="$(readlink -f "$IMAGE")"

case "$IMAGE" in
	'')
		echo "Image file not found." >&2
		exit 1
		;;
	/tmp/*)	;;
	*)
		v "Image not in /tmp, copying..."
		cp -f "$IMAGE" /tmp/sysupgrade.img
		IMAGE=/tmp/sysupgrade.img
		;;
esac
# Get the file size in bytes
file_size=$(ls -l "$IMAGE" | awk '{print $5}')
logger -p 'user.info' "sysupgrade: image size ( ${file_size} )"
if [[ $file_size -le 4096 ]]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
product_id=`cat /proc/device-tree/lantronix/product_id 2>/dev/null | tr -d '\n'`
if [ "$product_id" == "U1" -o "$product_id" == "U7" ]; then
    image_header=`dd if=${IMAGE} skip=0 bs=1 count=8 2>/dev/null | tr -d '\n'`
    if [ "$image_header" != "NUEVO-2" ]; then
        echo "ERROR: Invalid image signature"
        logger -p 'user.err' "sysupgrade: invalid image signature ( ${image_header} )"
        echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
        exit 1
    fi
fi
kromsz=$((0x$(dd if=${IMAGE} skip=220 bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"' | sed 's/\ /0/g')))
if [ $kromsz -le 0 ]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: failed to check kernel size ( ${kromsz} )"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
# Check if the kromsz value exceeds the file size
if [[ $kromsz -ge $file_size ]]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: failed to check kernel size"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
logger -p 'user.info' "sysupgrade: kernel size ( ${kromsz} )"

# Calculate the skip value
skip_value=$((kromsz + 56))
# Check if the skip value exceeds the file size
if [[ $skip_value -ge $file_size ]]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: failed to check rootfs size"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
rootsz=$((0x$(dd if=${IMAGE} skip=$(($kromsz + 56)) bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"' | sed 's/\ /0/g')))
if [ $rootsz -le 0 ]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: failed to check rootfs size"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
# Check if the rootsz value exceeds the file size
if [[ $rootsz -ge $file_size ]]; then
    echo "ERROR: Invalid image"
    logger -p 'user.err' "sysupgrade: failed to check rootsz size"
    logger -p 'user.err' "sysupgrade: invalid image"
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Invalid firmware image content,Failure" > `mktemp -u -p /var/fwupdate/`
    exit 1
fi
logger -p 'user.info' "sysupgrade: rootfs size ( ${rootsz} )"
json_load "$(/usr/libexec/validate_firmware_image "$IMAGE")" || {
	echo "ERROR: Failed to validate image"
    logger -p 'user.err' "sysupgrade: failed to validate image"
    logger -p 'user.err' "sysupgrade: invalid image"
	echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Failed to validate image,Failure" > `mktemp -u -p /var/fwupdate/`
	exit 1
}
json_get_var valid "valid"
[ "$valid" -eq 0 ] && {
	if [ $FORCE -eq 1 ]; then
		echo "Image check failed but --force given - will update anyway!" >&2
	else
		echo "ERROR: Image check failed." >&2
		echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Failed to validate image,Failure" > `mktemp -u -p /var/fwupdate/`
		exit 1
	fi
}


if [ -n "$CONF_IMAGE" ]; then
	case "$(get_magic_word $CONF_IMAGE cat)" in
		# .gz files
		1f8b) ;;
		*)
			echo "ERROR: Invalid config file. Please use only .tar.gz files" >&2
			echo -n "`date +%FT%T%z`,(none),(none),Configuration,Configuration Update,Invalid config file. Please use only .tar.gz files,Failure" > `mktemp -u -p /var/fwupdate/`
			exit 1
		;;
	esac
	get_image "$CONF_IMAGE" "cat" > "$CONF_TAR"
	export SAVE_CONFIG=1
elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then
    
    #this is needed on X-series due to less memory
    if [[ $TEST -eq 0 ]]; then
        logger -t sysupgrade "sysupgrade $TEST Killing ztc-client"
        kill -KILL `pidof ztc-client`
    fi
    
    [ $TEST -eq 1 ] || do_save_conffiles "$CONF_TAR"
	export SAVE_CONFIG=1
else
	[ $TEST -eq 1 ] || rm -f "$CONF_TAR"
	export SAVE_CONFIG=0
fi

if [ $TEST -eq 1 ]; then
	exit 0
fi

install_bin /sbin/upgraded
v "Commencing upgrade. Closing all shell sessions."

COMMAND='/lib/upgrade/do_stage2'

if [ -n "$FAILSAFE" ]; then
	printf '%s\x00%s\x00%s' "$RAM_ROOT" "$IMAGE" "$COMMAND" >/tmp/sysupgrade
	lock -u /tmp/.failsafe
else
	json_init
	json_add_string prefix "$RAM_ROOT"
	json_add_string path "$IMAGE"
	[ $FORCE -eq 1 ] && json_add_boolean force 1
	[ $SAVE_CONFIG -eq 1 ] && json_add_string backup "$CONF_TAR"
	json_add_string command "$COMMAND"
	json_add_object options
	json_add_int save_partitions "$SAVE_PARTITIONS"
	json_close_object
	#/usr/bin/logger -t cid_configuration -p info "copying cid, apn settings to the module, before fw upgrade"
	#/usr/sbin/preserve_cid_configuration.sh

	#//2023-03-20T08:32:35Z,root,192.168.13.166:35204,User,Login,User 'root' logged in from ssh,Success
    echo -n "`date +%FT%T%z`,(none),(none),Firmware,Firmware Update,Updating firmware,Success" > `mktemp -u -p /var/fwupdate/`
    sleep 5
    ltrx_getifinfo SHUTDOWN #this is just a notification that system will shutdown
    sleep 5 # let consoleflow client process this
    insmod mtd-rw i_want_a_brick=1
	fw_setenv last_version `cat /etc/openwrt_version | tr -d '\n' 2>/dev/null`
	rmmod mtd-rw
	sleep 5 # let consoleflow client process this
    
    #this is needed on X-series due to less memory
    #killall 
    # Iterate over each process name provided as an argument
    for process_name in netman ltrx_as ltrx_evo ltrx_mach10 ztc-client webcontrol webterminal bluetoothd; do
        #logger -t upgrade "Searching for processes matching: $process_name"

        # Find and kill processes by name
        pids=$(pidof "$process_name")

        if [ -n "$pids" ]; then
            #logger -t upgrade "Killing the following processes:"
            #logger -t upgrade "$pids"

            # Kill the processes
            kill -KILL $pids

            if [ $? -eq 0 ]; then
              logger -t upgrade "Successfully killed processes for: $process_name"
            else
              logger -t upgrade "Failed to kill processes for: $process_name"
            fi
        else
            logger -t upgrade "No processes found for: $process_name"
        fi
    done
	ubus call system sysupgrade "$(json_dump)"
fi
