postinst is in shorewall 4.5.5.3-3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #!/bin/sh -e
. /usr/share/debconf/confmodule 
case "$1" in
    configure)
        db_reset shorewall/dont_restart || true
        db_reset shorewall/major_release || true
        db_go
        if [ ! -d /var/lib/shorewall ]
        then
            mkdir -p /var/lib/shorewall
        fi
        # The init script was moved from shorewall-common to shorewall, but
        # the shorewall-common postrm tries to remove the symlinks, which
        # cannot happen since /etc/init.d/shorewall now exists in the
        # shorewall package.
        if [ -f "/var/lib/dpkg/info/shorewall-common.postrm" ]
        then
            rm -f /var/lib/dpkg/info/shorewall-common.postrm
        fi
        restart="true"
        if [ -f "/etc/default/shorewall" ]
        then
            . /etc/default/shorewall
        fi
        if [ "$restart" = "true" ] && [ "$startup" = "1" ]
        then 
            if /sbin/shorewall check
            then
                if [ -x "/usr/sbin/invoke-rc.d" ]
                then
                    invoke-rc.d shorewall restart
                else
                    /etc/init.d/shorewall restart
                fi
            else
                db_input critical shorewall/invalid_config || true
            fi
        fi
        ;;
    
    abort-upgrade|abort-remove|abort-deconfigure)
        ;;
        
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 0
        ;;
esac
# Automatically added by dh_installinit
if [ -x "/etc/init.d/shorewall" ]; then
	update-rc.d shorewall start 40 S . stop 89 0 6 . >/dev/null || exit $?
fi
# End automatically added section
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