#!/bin/sh
# Copyright (c) 2000-2016 Synology Inc. All rights reserved.
#
# A iptables wrapper that aims to replace with original iptables
# This wrapper will excute the orginal iptables and retry when EAGAIN is received

RETRY_TIMES=5
RETRY_INTERVAL_MIN_MSECS=1000
RETRY_INTERVAL_MAX_MSECS=3000

i=0
while [ ${i} -lt ${RETRY_TIMES} ]; do
	/usr/bin/xtables-multi iptables $@
	originalExitCode=$?
	# Resource problem (resource temporarily unavailable)
	if [ ${originalExitCode} -ne 4 ]; then
		exit ${originalExitCode}
	fi
	usleep $((RETRY_INTERVAL_MIN_MSECS + (RANDOM % (RETRY_INTERVAL_MAX_MSECS - RETRY_INTERVAL_MIN_MSECS))))
	i=$((i+1))
done

exit ${originalExitCode}