#!/usr/bin/env bash
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

source /root/func.sh
source /opt/cloud/bin/vpc_func.sh

vpnoutmark="0x525"
vpninmark="0x524"
lock="biglock"
locked=$(getLockFile $lock)
if [ "$locked" != "1" ]
then
    exit 1
fi

usage() {
  printf "Usage: %s -[c|g|r|n|d] [-l <public gateway>] [-v <vpc cidr>] \n" $(basename $0)  >&2
}

create_usage_rules () {
  iptables-save|grep "NETWORK_STATS_$ethDev" > /dev/null
  if [ $? -gt 0 ]
  then
    iptables -N NETWORK_STATS_$ethDev > /dev/null;
    iptables -I FORWARD -j NETWORK_STATS_$ethDev > /dev/null;
    iptables -A NETWORK_STATS_$ethDev -o $ethDev -s $vcidr > /dev/null;
    iptables -A NETWORK_STATS_$ethDev -i $ethDev -d $vcidr > /dev/null;
  fi
  return $?
}

create_vpn_usage_rules () {
  iptables-save|grep "VPN_STATS_$ethDev" > /dev/null
  if [ $? -gt 0 ]
  then
    iptables -t mangle -N VPN_STATS_$ethDev > /dev/null;
    iptables -t mangle -I FORWARD -j VPN_STATS_$ethDev > /dev/null;
    iptables -t mangle -A VPN_STATS_$ethDev -o $ethDev -m mark --mark $vpnoutmark > /dev/null;
    iptables -t mangle -A VPN_STATS_$ethDev -i $ethDev -m mark --mark $vpninmark > /dev/null;
  fi
  return $?
}

remove_usage_rules () {
  return 0
}

get_usage () {
  iptables -L NETWORK_STATS_$ethDev -n -v -x 2> /dev/null | awk '$1 ~ /^[0-9]+$/ { printf "%s:", $2}'; > /dev/null
  return 0
}

get_vpn_usage () {
  iptables -t mangle -L VPN_STATS_$ethDev -n -v -x | awk '$1 ~ /^[0-9]+$/ { printf "%s:", $2}'; > /dev/null
  if [ $? -gt 0 ]
  then
     printf $?
     return 1
  fi
}

reset_usage () {
  iptables -Z NETWORK_STATS_$ethDev > /dev/null
  if [ $? -gt 0  -a $? -ne 2 ]
  then
     return 1
  fi
}

#set -x

cflag=
gflag=
rflag=
lflag=
vflag=
nflag=
dflag=

while getopts 'cgndrl:v:' OPTION
do
  case $OPTION in
  c)	cflag=1
	;;
  g)	gflag=1
	;;
  r)	rflag=1
	;;
  l)    lflag=1
        publicIp="$OPTARG"
        ;;
  v)    vflag=1
        vcidr="$OPTARG"
        ;;
  n)	nflag=1
	;;
  d)	dflag=1
	;;
  i)    #Do nothing, since it's parameter for host script
        ;;
  ?)	usage
        unlock_exit 2 $lock $locked
	;;
  esac
done

ethDev=$(getEthByIp $publicIp)
if [ "$cflag" == "1" ]
then
  if [ "$ethDev" != "" ]
  then
    create_usage_rules
    create_vpn_usage_rules
    unlock_exit 0 $lock $locked
   fi
fi

if [ "$gflag" == "1" ]
then
  get_usage
  unlock_exit $? $lock $locked
fi

if [ "$nflag" == "1" ]
then
  #get_vpn_usage
  unlock_exit $? $lock $locked
fi

if [ "$dflag" == "1" ]
then
  #remove_usage_rules
  unlock_exit 0 $lock $locked
fi

if [ "$rflag" == "1" ]
then
  reset_usage
  unlock_exit $? $lock $locked
fi


unlock_exit 0 $lock $locked