# init script functions library for desktop linux systems

ZAPRET_BASE=${ZAPRET_BASE:-/opt/zapret2}
ZAPRET_RW=${ZAPRET_RW:-"$ZAPRET_BASE"}
ZAPRET_CONFIG=${ZAPRET_CONFIG:-"$ZAPRET_RW/config"}
. "$ZAPRET_CONFIG"
. "$ZAPRET_BASE/common/base.sh"
. "$ZAPRET_BASE/common/fwtype.sh"
. "$ZAPRET_BASE/common/linux_iphelper.sh"
. "$ZAPRET_BASE/common/ipt.sh"
. "$ZAPRET_BASE/common/nft.sh"
. "$ZAPRET_BASE/common/linux_fw.sh"
. "$ZAPRET_BASE/common/linux_daemons.sh"
. "$ZAPRET_BASE/common/list.sh"
. "$ZAPRET_BASE/common/custom.sh"
CUSTOM_DIR="$ZAPRET_RW/init.d/sysv"


user_exists()
{
	id -u $1 >/dev/null 2>/dev/null
}
useradd_compat()
{
	# $1 - username
	# skip for readonly systems
	[ -w "/etc" ] && {
		if exists useradd ; then
			useradd --no-create-home --system --shell /bin/false $1
		elif is_linked_to_busybox adduser ; then
			# some systems may miss nogroup group in /etc/group
			# adduser fails if it's absent and no group is specified
			addgroup nogroup 2>/dev/null
			# busybox has special adduser syntax
			adduser -S -H -D $1
		elif exists adduser; then
			adduser --no-create-home --system --disabled-login $1
		fi
	}
	user_exists $1
}
prepare_user()
{
	user_exists $WS_USER || {
		# fallback to daemon if we cant add WS_USER
		useradd_compat $WS_USER || {
			for user in daemon nobody; do
				user_exists $user && {
					WS_USER=$user
					return 0
				}
			done
			return 1
		}
	}
}

# this complex user selection allows to survive in any locked/readonly/minimalistic environment
[ -n "$WS_USER" ] || WS_USER=tpws
if prepare_user; then
 USEROPT="--user=$WS_USER"
else
 WS_USER=1
 USEROPT="--uid $WS_USER:$WS_USER"
fi

PIDDIR=/var/run
IPSET_CR="$ZAPRET_BASE/ipset/create_ipset.sh"

DESYNC_MARK=${DESYNC_MARK:-0x40000000}
DESYNC_MARK_POSTNAT=${DESYNC_MARK_POSTNAT:-0x20000000}

QNUM=${QNUM:-300}
NFQWS2="${NFQWS2:-$ZAPRET_BASE/nfq2/nfqws2}"
LUAOPT="--lua-init=@$ZAPRET_BASE/lua/zapret-lib.lua --lua-init=@$ZAPRET_BASE/lua/zapret-antidpi.lua --lua-init=@$ZAPRET_BASE/lua/zapret-auto.lua"
NFQWS2_OPT_BASE="$USEROPT --fwmark=$DESYNC_MARK $LUAOPT"

get_wanif46()
{
	# $1 - 4/6
	# $2 - var to receive interface list
	case $1 in
		6)
			eval $2="\${IFACE_WAN6:-$IFACE_WAN}"
			;;
		4)
			eval $2="\$IFACE_WAN"
			;;
		*)
			eval $2=
	esac
}
get_lanif()
{
	# $1 - var to receive interface list
	eval $1="\$IFACE_LAN"
}

fw_nfqws_post4()
{
	_fw_nfqws_post4  $1 "$2" $3 "$IFACE_WAN"
}
fw_nfqws_post6()
{
	_fw_nfqws_post6  $1 "$2" $3 "${IFACE_WAN6:-$IFACE_WAN}"
}
fw_nfqws_pre4()
{
	_fw_nfqws_pre4  $1 "$2" $3 "$IFACE_WAN"
}
fw_nfqws_pre6()
{
	_fw_nfqws_pre6  $1 "$2" $3 "${IFACE_WAN6:-$IFACE_WAN}"
}
nft_fw_nfqws_post4()
{
	_nft_fw_nfqws_post4 "$1" $2 "$IFACE_WAN"
}
nft_fw_nfqws_post6()
{
	_nft_fw_nfqws_post6 "$1" $2 "${IFACE_WAN6:-$IFACE_WAN}"
}
nft_fw_nfqws_pre4()
{
	_nft_fw_nfqws_pre4 "$1" $2 "$IFACE_WAN"
}
nft_fw_nfqws_pre6()
{
	_nft_fw_nfqws_pre6 "$1" $2 "${IFACE_WAN6:-$IFACE_WAN}"
}

nft_wanif_filter_present()
{
	[ -n "$IFACE_WAN" ]
}
nft_wanif6_filter_present()
{
	[ -n "${IFACE_WAN6:-$IFACE_WAN}" ]
}
nft_fill_ifsets_overload()
{
	nft_fill_ifsets "$IFACE_LAN" "$IFACE_WAN" "${IFACE_WAN6:-$IFACE_WAN}"
}


run_daemon()
{
	# $1 - daemon number : 1,2,3,...
	# $2 - daemon
	# $3 - daemon args
	# use $PIDDIR/$DAEMONBASE$1.pid as pidfile

	local DAEMONBASE="$(basename "$2")"
	local PID= PIDFILE=$PIDDIR/${DAEMONBASE}_$1.pid
	echo "Starting daemon $1: $2 $3"

	[ -f "$PIDFILE" ] && {
		read PID <"$PIDFILE"
		[ -d "/proc/$PID" ] || PID=
	}

	if [ -n "$PID" ]; then
		echo already running
	else
		"$2" $3 >/dev/null &
		PID=$!
		if [ -n "$PID" ]; then
			echo $PID >$PIDFILE
		else
			echo could not start daemon $1 : $2 $3
			false
		fi
	fi
}
stop_daemon()
{
	# $1 - daemon number : 1,2,3,...
	# $2 - daemon
	# use $PIDDIR/$DAEMONBASE$1.pid as pidfile
	local DAEMONBASE="$(basename "$2")"
	local PID PIDFILE=$PIDDIR/${DAEMONBASE}_$1.pid
	echo "Stopping daemon $1: $2"
	if [ -f "$PIDFILE" ]; then
		read PID <"$PIDFILE"
		kill $PID
		rm -f "$PIDFILE"
	else
		echo no pidfile : $PIDFILE
	fi
}
do_daemon()
{
	# $1 - 1 - run, 0 - stop
	on_off_function run_daemon stop_daemon "$@"
}

do_nfqws()
{
	# $1 : 1 - run, 0 - stop
	# $2 : daemon number
	# $3 : daemon args

	do_daemon $1 $2 "$NFQWS2" "$NFQWS2_OPT_BASE $3"
}


create_ipset()
{
	echo "Creating ip list table (firewall type $FWTYPE)"
	"$IPSET_CR" "$@"
}