This file is indexed.

/etc/network/if-down.d/99masqmail is in masqmail 0.2.30-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# Exit if package was removed but not purged.
test -x /usr/sbin/masqmail || exit 0

# defaults, do not edit here but in
# /etc/default/masqmail
IPUP_RUNQUEUE=true
IPUP_FETCH=true

[ -r /etc/default/masqmail ] && . /etc/default/masqmail

if [ -n "$PPP_IFACE" ]; then
	SCHEME="$PPP_IPPARAM"
	IFACE=$PPP_IFACE
else
	SCHEME="${IF_MROUTE:-$IF_NAME}"
fi

if [ ! x"$IFUP_IFACES" = x"all" ] ; then
  echo $IFUP_IFACES | grep $IFACE > /dev/null || exit 0
fi

DETECT="`awk -F'[ \t]*=[ \t]*' '/^online_detect/ \
	{ print split($2,A,\"\\\"\") == 3 ? A[2] :  $2 }' /etc/masqmail/masqmail.conf`"

if [ x"$DETECT" = x"file" ] ; then
    ROUTEFILE="`awk -F'[ \t]*=[ \t]*' '/^online_file/ \
	    { print split($2,A,\"\\\"\") == 3 ? A[2] :  $2 }' /etc/masqmail/masqmail.conf`"

    if [ -z "$ROUTEFILE" ]; then
	    echo "no online_file defined in /etc/masqmail/masqmail.conf"
	    exit 1
    fi
fi

if [ -z "$MODE" ]; then
	case `dirname "$0"` in
		*/if-up.d|*/ip-up.d)
		    MODE=start;
		    ;;
		*/if-down.d|*/ip-down.d)
		    MODE=stop;
		    ;;
	esac
fi

case "$MODE" in
	start)
		if [ -n "$SCHEME" ] ; then
		    echo -n "$SCHEME" > "$ROUTEFILE"
		    chmod 0644 "$ROUTEFILE"
		else
		    echo -n "$PPP_IFACE" > "$ROUTEFILE"
		    chmod 0644 "$ROUTEFILE"
		fi
		if [ x"$IPUP_RUNQUEUE" = x"true" ] ; then
		    /usr/sbin/masqmail -qo &
		fi
		if [ x"$IPUP_FETCH" = x"true" ] ; then
		    /usr/sbin/masqmail -go &
		fi
		;;
	stop)
		rm -f "$ROUTEFILE"
		;;
	*)
		echo "$0: unknown MODE"
		;;
esac

exit 0