#!/bin/bash

# Copyright 2023 Google LLC
#
# Licensed 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.

echo 'Enabling IP forwarding'
sed '/net.ipv4.ip_forward=1/s/^#//g' -i /etc/sysctl.conf &&
sysctl -p /etc/sysctl.conf &&
/etc/init.d/procps restart

echo 'Setting routes'
ip route add ${spoke-primary} via ${gateway-trusted} dev ens5
ip route add ${spoke-secondary} via ${gateway-trusted} dev ens5

echo 'Setting NAT masquerade, so that HCs can reach the spoke through the NVA using the trusted intf source IP'
iptables \
  -t nat \
  -A POSTROUTING \
  -s 130.211.0.0/22,35.191.0.0/16 \
  -d ${spoke-primary} \
  -p tcp \
  --dport 80 \
  -j MASQUERADE
iptables \
  -t nat \
  -A POSTROUTING \
  -s 130.211.0.0/22,35.191.0.0/16 \
  -d ${spoke-secondary} \
  -p tcp \
  --dport 80 \
  -j MASQUERADE