update_cfgtbl() {
    if [ "$cmode"   == $cmode_default ];   then cmode=;   fi
    if [ "$csplash" == $csplash_default ]; then csplash=; fi
    p2ptbl update  $tbl $mac "$cname,$cmode,$csplash,$cip"
}

# parse changes
while read key val; do
    case "$key" in 
	client_access)
	    case "$val" in
		bridged|routed|isolated) cmode=$val;;
		*) fail;;
	    esac
	    lazy 20 splash_sync
	    ;;
	client_name)
	    [ -z "$(echo "$val" | tr -d '0-9a-z_')" ] \
		|| fail 400 'Unerlaubte Zeichen verwendet'
	    [ "$val" != "$cname" ] \
		|| continue
	    [ -z "$(p2ptbl show $tbl | cut -f2 | grep "^$val,")" ] \
		|| fail 403 'Name bereits vergeben'
	    cname=$val
	    lazy 10 sync_dhcp
	    ;;
	# client_splash is send iff. it is checked; update_splash is
	# send in every case
	update_splash)
	    update_splash=${update_splash-false}
	    lazy 20 splash_sync
	    ;;
	client_splash)
	    update_splash=true
	    ;;
	*)
	    fail 400 "wtf is $key?"
	    ;;
    esac
done <<EOF
$(tr '=&' ' \n')
EOF

if [ -n "$update_splash" ]; then
    csplash=$update_splash
fi

# update p2ptbl entry
lazy 00 update_cfgtbl