#!/bin/bash

## NOTE:
## before running the script, customize the values of variables suitable for your deployment. 
## asn_quagga: Autonomous system number assigned to quagga
## bgp_routerId: IP address of quagga VM
## bgp_network1: first network advertised from quagga to the router server (inclusive of subnetmask)
## bgp_network2: second network advertised from quagga to the router server (inclusive of subnetmask)
## bgp_network3: third network advertised from quagga to the router server (inclusive of subnetmask)
## routeserver_IP1: first IP address of the router server 
## routeserver_IP2: second IP address of the router server

asn_quagga=65001
bgp_routerId=10.1.4.10
bgp_network1=10.100.1.0/24
bgp_network2=10.100.2.0/24
bgp_network3=10.100.3.0/24
routeserver_IP1=10.1.1.4
routeserver_IP2=10.1.1.5


sudo apt-get -y update

## Install the Quagga routing daemon
echo "Installing quagga"
sudo apt-get -y install quagga

##  run the updates and ensure the packages are up to date and there is no new version available for the packages
sudo apt-get -y update --fix-missing

## Enable IPv4 forwarding
echo "net.ipv4.conf.all.forwarding=1" | sudo tee -a /etc/sysctl.conf 
echo "net.ipv4.conf.default.forwarding=1" | sudo tee -a /etc/sysctl.conf 
sysctl -p

## Create a folder for the quagga logs
echo "creating folder for quagga logs"
sudo mkdir -p /var/log/quagga && sudo chown quagga:quagga /var/log/quagga
sudo touch /var/log/zebra.log
sudo chown quagga:quagga /var/log/zebra.log

## Create the configuration files for Quagga daemon
echo "creating empty quagga config files"
sudo touch /etc/quagga/babeld.conf
sudo touch /etc/quagga/bgpd.conf
sudo touch /etc/quagga/isisd.conf
sudo touch /etc/quagga/ospf6d.conf
sudo touch /etc/quagga/ospfd.conf
sudo touch /etc/quagga/ripd.conf
sudo touch /etc/quagga/ripngd.conf
sudo touch /etc/quagga/vtysh.conf
sudo touch /etc/quagga/zebra.conf

## Change the ownership and permission for configuration files, under /etc/quagga folder
echo "assign to quagga user the ownership of config files"
sudo chown quagga:quagga /etc/quagga/babeld.conf && sudo chmod 640 /etc/quagga/babeld.conf
sudo chown quagga:quagga /etc/quagga/bgpd.conf && sudo chmod 640 /etc/quagga/bgpd.conf
sudo chown quagga:quagga /etc/quagga/isisd.conf && sudo chmod 640 /etc/quagga/isisd.conf
sudo chown quagga:quagga /etc/quagga/ospf6d.conf && sudo chmod 640 /etc/quagga/ospf6d.conf
sudo chown quagga:quagga /etc/quagga/ospfd.conf && sudo chmod 640 /etc/quagga/ospfd.conf
sudo chown quagga:quagga /etc/quagga/ripd.conf && sudo chmod 640 /etc/quagga/ripd.conf
sudo chown quagga:quagga /etc/quagga/ripngd.conf && sudo chmod 640 /etc/quagga/ripngd.conf
sudo chown quagga:quaggavty /etc/quagga/vtysh.conf && sudo chmod 660 /etc/quagga/vtysh.conf
sudo chown quagga:quagga /etc/quagga/zebra.conf && sudo chmod 640 /etc/quagga/zebra.conf

## initial startup configuration for Quagga daemons are required
echo "Setting up daemon startup config"
echo 'zebra=yes' > /etc/quagga/daemons
echo 'bgpd=yes' >> /etc/quagga/daemons
echo 'ospfd=no' >> /etc/quagga/daemons
echo 'ospf6d=no' >> /etc/quagga/daemons
echo 'ripd=no' >> /etc/quagga/daemons
echo 'ripngd=no' >> /etc/quagga/daemons
echo 'isisd=no' >> /etc/quagga/daemons
echo 'babeld=no' >> /etc/quagga/daemons

echo "add zebra config"
cat <<EOF > /etc/quagga/zebra.conf
!
interface eth0
!
interface lo
!
ip forwarding
!
line vty
!
EOF


echo "add quagga config"
cat <<EOF > /etc/quagga/bgpd.conf
!
router bgp $asn_quagga
 bgp router-id $bgp_routerId
 network $bgp_network1
 network $bgp_network2
 network $bgp_network3
 neighbor $routeserver_IP1 remote-as 65515
 neighbor $routeserver_IP1 soft-reconfiguration inbound
 neighbor $routeserver_IP2 remote-as 65515
 neighbor $routeserver_IP2 soft-reconfiguration inbound
!
 address-family ipv6
 exit-address-family
 exit
!
line vty
!
EOF

## to start daemons at system startup
echo "enable zebra and quagga daemons at system startup"
systemctl enable zebra.service
systemctl enable bgpd.service

## run the daemons
echo "start zebra and quagga daemons"
systemctl start zebra 
systemctl start bgpd