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#!/bin/bash
########################################################################################################################
# gns3-install-on-remote-server.sh
########################################################################################################################
#
# All rights reserved Ⓒ 2017-2022 sdxlive.com
#
# Written by Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv3 License.
# You may not use this file except in compliance with the License. You may obtain a copy of the License at
#
#    https://www.gnu.org/licenses/gpl-3.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. 
# You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
#
########################################################################################################################

########################################################################################################################
#
# Installing GNS3 as a Service on a recent remote Debian/Ubuntu bare-metal/VM server inside an OpenVPN tunnel.
# The server must be remotely accessible through Internet, for instance a VM or a bare metal server in a public cloud 
# such as packet.net. 
# This sets up all the required packages.
# An OpenVPN management interface has also been setup to enable management commands with 'telnet 127.0.0.1 1195' on the 
# server.
# The security of the whole process has been enforced and hardened.
#
########################################################################################################################
#
# Requirements:
# ------------
#
# - We assume that this script is run as **root**.
#
########################################################################################################################
#
# Parameters:
# ----------
#
# The follwoing parameters are all optional, except --username:
# --apt-sources-url=<URL>:                      URL of latest stable Debian/Ubuntu APT sources
#                                               By default, it is http://deb.debian.org/debian or http://archive.ubuntu.com/ubuntu
# --gns3-port=<port_number>                     Port number which GNS3 server listens to
#                                               By default, it is 3080
# --openvpn-tunnel-ip-address=<ip_address>      OpenVPN tunnel IPv4 address on which GNS3 server listens
#                                               By default, it is 172.31.255.1
# --repository=<gns3|jc-manciot>:               Choose a repository between:
#                                                       + gns3: official GNS3 repository
#                                                       + jc-manciot: latest deb packages including GNS3 on the latest stable 
#                                                         Debian/Ubuntu release for x86_64 architectures
#                                               By default, it is jc-manciot.
# --username=<username>:                        on the server
# --without-new-apt-sources:                    Don't install new /etc/apt/sources.list
#                                               By default, on Debian, the follwoing are installed in /etc/apt/sources.list:
#                                                       + deb http://deb.debian.org/debian/debian testing main contrib non-free
#                                                       + deb deb http://security.debian.org/ testing/updates main contrib non-free
#                                               By default, on Ubuntu, the follwoing are installed /etc/apt/sources.list:
#                                                       + deb http://archive.ubuntu.com/ubuntu <os_code_name> main restricted multiverse universe
#                                                       + deb http://archive.ubuntu.com/ubuntu <os_code_name>-updates main restricted multiverse universe
#                                                       + deb http://archive.ubuntu.com/ubuntu <os_code_name>-security main restricted multiverse universe
# --without-openvpn:                            Don't install Open VPN: the communications with GNS3 server won't be encrypted
#                                               By default, an Open VPN is installed & configured.
# --without-openvpn-purge:                      Don't purge OpenVPN prior to its reinstallation if it is set to be used
#                                               By default, openVPN is purged before its installation.
# --without-ufw-gns3-port:                      Don't open GNS3 port on UFW firewall.
#                                               By default, UFW is used and GNS3 port is allowed for all sources within or outside  
#                                               OpenVPN tunnel depending on the configuration.
#                                               3080 port and tcp/5000:10000 console ports must be allowed manually somehow on UFW for GNS3 server
#                                               to be able to connect to its client(s).
# --without-ufw-openvpn-port:                   Don't open openvpn port on UFW firewall.
#                                               By default, UFW is used and openVPN port is allowed for all sources.
#                                               udp/1194 port must be allowed manually somehow on UFW for the OpenVPN tunnel to work.
# --without-ufw-ssh-port:                       Don't open ssh port on UFW firewall.
#                                               By default, UFW is used and ssh port is allowed for all sources.
#                                               tcp/22 port must be allowed manually somehow on UFW beforehand to be able to:
#                                                       + keep the current SSH session alive
#                                                       + retrieve the OpenVPN bundle.
# --without-unstable-repository:                Use only JC Manciot's DR/PPA stable repository
#                                               By default, stable & unstable JC Manciot's DR/PPA are used
# --help
#
#######################################################################################################################
#
# Usage:
# -----
#
# ssh root@<remote_server_ip_address>
#
# Inside the server terminal:
# --------------------------
# sudo -i
# wget https://git.sdxlive.com/DR/plain/GNS3/gns3-install-on-remote-server.sh
# chmod +x gns3-install-on-remote-server.sh
# ./gns3-install-on-remote-server.sh --username=<username> --without-ufw-gns3-port
# reboot
# 
# ssh root@<remote_server_ip_address>
#
# Then follow the instructions on the screen once the server has restarted
########################################################################################################################
# set -x
# Allowing extended pattern matching
shopt -s extglob

function help 
{
        printf "%s\n" "________________________________________________________________________________________" >&2
        printf "%s\n" "Installing GNS3-as-a-Service on a recent remote cloud Debian/Ubuntu bare-metal/VM server" >&2
        printf "%s\n" "========================================================================================" >&2
        printf "%s\n" "Necessary:" >&2
        printf "%s\n" "---------" >&2
        printf "%s\n" "--username=<username>                    Username on the server" >&2
        printf "\n" >&2
        printf "%s\n" "Optional:" >&2
        printf "%s\n" "--------" >&2
        printf "%s\n" "--apt-sources-url=<URL>                  URL of latest stable Debian/Ubuntu APT sources" >&2
        printf "%s\n" "                                         By default, it is http://deb.debian.org/debian or http://archive.ubuntu.com/ubuntu" >&2
        printf "%s\n" "--gns3-port=<port_number>                Port number which GNS3 server listens to" >&2
        printf "%s\n" "                                         By default, it is 3080" >&2
        printf "%s\n" "--openvpn-tunnel-ip-address=<ip_address> OpenVPN tunnel IPv4 address on which GNS3 server listens" >&2
        printf "%s\n" "                                         By default, it is 172.31.255.1" >&2
        printf "%s\n" "--repository=<gns3|jc-manciot>           Choose a repository between:" >&2
        printf "%s\n" "                                                 + gns3: official GNS3 repository" >&2
        printf "%s\n" "                                                 + jc-manciot: latest deb packages including GNS3 on the latest stable Debian/Ubuntu" >&2
        printf "%s\n" "                                                   release for x86_64 architectures" >&2
        printf "%s\n" "                                         By default, it is jc-manciot." >&2
        printf "%s\n" "--without-new-apt-sources                Don't install new /etc/apt/sources.list" >&2
        printf "%s\n" "                                         By default, on Debian, the follwoing are installed in /etc/apt/sources.list:" >&2
        printf "%s\n" "                                                 + deb http://deb.debian.org/debian/debian testing main contrib non-free" >&2
        printf "%s\n" "                                                 + deb http://security.debian.org/ testing/updates main contrib non-free" >&2
        printf "%s\n" "                                         By default, on Ubuntu, the follwoing are installed /etc/apt/sources.list:" >&2
        printf "%s\n" "                                                 + deb http://archive.ubuntu.com/ubuntu <os_code_name> main restricted multiverse universe" >&2
        printf "%s\n" "                                                 + deb http://archive.ubuntu.com/ubuntu <os_code_name>-updates main restricted multiverse universe" >&2
        printf "%s\n" "                                                 + deb http://archive.ubuntu.com/ubuntu <os_code_name>-security main restricted multiverse universe" >&2
        printf "%s\n" "--without-openvpn                        Don't install Open VPN; the communications with GNS3 server won't be encrypted" >&2
        printf "%s\n" "                                         By default, an Open VPN is installed & configured." >&2
        printf "%s\n" "--without-openvpn-purge                  Don't purge OpenVPN prior to its reinstallation if it is set to be used" >&2
        printf "%s\n" "                                         By default, openVPN is purged before its installation." >&2
        printf "%s\n" "--without-ufw-gns3-port                  Don't open GNS3 port on UFW firewall." >&2
        printf "%s\n" "                                         By default, UFW is used and GNS3 port is allowed for all sources within or outside" >&2
        printf "%s\n" "                                         OpenVPN tunnel depending on the configuration." >&2
        printf "%s\n" "                                         3080 port and tcp/5000:10000 console ports must be allowed manually somehow on UFW for GNS3 server" >&2
        printf "%s\n" "                                         to be able to connect to its client(s)." >&2
        printf "%s\n" "--without-ufw-openvpn-port               Don't open openvpn port on UFW firewall." >&2
        printf "%s\n" "                                         By default, UFW is used and openVPN port is allowed for all sources." >&2
        printf "%s\n" "                                         udp/1194 port must be allowed manually somehow on UFW for the OpenVPN tunnel to work." >&2
        printf "%s\n" "--without-ufw-ssh-port                   Don't open ssh port on UFW firewall." >&2
        printf "%s\n" "                                         By default, UFW is used and ssh port is allowed for all sources." >&2
        printf "%s\n" "                                         tcp/22 port must be allowed manually somehow on UFW beforehand to be able to:" >&2
        printf "%s\n" "                                                 + keep the current SSH session alive" >&2
        printf "%s\n" "                                                 + retrieve the OpenVPN bundle" >&2
        printf "%s\n" "--without-unstable-repository            Use only JC Manciot's DR/PPA stable repository" >&2
        printf "%s\n" "                                         By default, stable & unstable JC Manciot's DR/PPA are used" >&2
        printf "%s\n" "--help:                                  This help" >&2
}

function report 
{
        printf "%s\n" "______________________________________________________________________________________________________________" >&2
        printf "%s\n" "=> $1" >&2
        printf "%s\n" "==============================================================================================================" >&2
}

function version-ge() { test "$(echo "$@" | tr " " "\n" | sort -uV | head -n 1)" == "$2"; }

if [[ $(whoami) != root ]]; then
        report "This script must be run as root"
        exit 1
fi        

username=""
url_regex='(http[s]*|ftp)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]*[-A-Za-z0-9+&@#/%=~_|]'

repository=jc-manciot
unstable_repository_enabled=true
new_apt_sources_enabled=true

gns3_port=3080
gns3_console_port_range=5000:10000
ufw_gns3_port_enabled=true

openvpn_enabled=true
openvpn_port=1194
openvpn_purge_enabled=true
openvpn_tunnel_ip_address=172.31.255.1
ufw_openvpn_port_enabled=true

ssh_port=22
ufw_ssh_port_enabled=true

# Reading the options
OPTIONS=`getopt -o h --long apt-sources-url:,gns3-port:,openvpn-tunnel-ip-address:,repository:,username:,without-new-apt-sources,without-openvpn,without-openvpn-purge,without-ufw-gns3-port,without-ufw-openvpn-port,without-ufw-ssh-port,without-unstable-repository,help -n 'gns3-install-on-remote-server.sh' -- "$@"`
if [ $? -ne 0 ]
then
        help
        exit 1
fi
eval set -- "$OPTIONS"

# Extracting options and their arguments into variables.
while true ; do
        case "$1" in
                --apt-sources-url)
                        case "$2" in
                                "") 
                                        ;;
                                *)
                                        apt_sources_url=$2
                                        ;;
                        esac
                        shift 2
                        ;;
                --gns3-port)
                        case "$2" in
                                "") 
                                        ;;
                                *)
                                        gns3_port=$2
                                        ;;
                        esac
                        shift 2
                        ;;
                --openvpn-tunnel-ip-address)
                        case "$2" in
                                "") 
                                        ;;
                                *)
                                        openvpn_tunnel_ip_address=$2
                                        ;;
                        esac
                        shift 2
                        ;;
                --repository)
                        case "$2" in
                                "") 
                                        ;;
                                *)
                                        repository=$2
                                        ;;
                        esac
                        shift 2
                        ;;
                --username)
                        case "$2" in
                                "") 
                                        ;;
                                *)
                                        username=$2
                                        ;;
                        esac
                        shift 2
                        ;;
                --without-new-apt-sources)
                        new_apt_sources_enabled=false
                        shift
                        ;;
                --without-openvpn)
                        openvpn_enabled=false
                        shift
                        ;;
                --without-openvpn-purge)
                        openvpn_purge_enabled=false
                        shift
                        ;;
                --without-ufw-gns3-port)
                        ufw_gns3_port_enabled=false
                        shift
                        ;;
                --without-ufw-openvpn-port)
                        ufw_openvpn_port_enabled=false
                        shift
                        ;;
                --without-ufw-ssh-port)
                        ufw_ssh_port_enabled=false
                        shift
                        ;;
                --without-unstable-repository)
                        unstable_repository_enabled=false
                        shift
                        ;;
                -h|--help)
                        help
                        exit 1
                        ;;
                --) 
                        shift
                        break
                        ;;
                *)
                        report "Internal error $1"
                        exit 1
                        ;;
        esac
done

if [[ -z $username ]]; then
        report "--username=<username> option is missing"
        exit 1
elif [[ (-n "$apt_sources_url") && (! "$apt_sources_url" =~ $url_regex) ]]; then
        report "$apt_sources_url URL format is not valid"
        exit 1
fi

export DEBIAN_FRONTEND="noninteractive"

os_distribution=$(lsb_release -a  2>/dev/null | grep "Distributor ID" | cut -d ':' -f 2)
os_distribution=${os_distribution//[[:space:]]/}
os_version=$(lsb_release -a  2>/dev/null | grep "Release" | cut -d ':' -f 2)
os_version=${os_version//[[:space:]]/}
os_code_name=$(lsb_release -a  2>/dev/null | grep "Codename" | cut -d ':' -f 2)
os_code_name=${os_code_name//[[:space:]]/}
linux_kernel_version=$(uname -r)
python3_version=$($(which python3) --version | cut -d ' ' -f 2 | sed -E 's|^([0-9]+\.[0-9]+)\..*$|\1|g')
pip3="python${python3_version} -m pip"
case $os_distribution in
        Debian)
                git_repo=DR
                if [[ $os_version =~ testing ]]; then
                        os_version='11.0'
                fi
                if [[ -z "$apt_sources_url" ]]; then
                        apt_sources_url="http://deb.debian.org/debian"
                fi
                case $os_version in
                        11*) # bullseye
                                # Verifying that it is what it says it is
                                if [[ "$linux_kernel_version" < 4.19 ]]; then
                                        echo "Linux kernel version $linux_kernel_version is incompatible with $os_distribution 11.x"
                                        exit 1
                                fi

                                if [[ $new_apt_sources_enabled == true ]]; then
                                        report "Installing new apt sources"
cat <<EOFAPT > /etc/apt/sources.list
deb "$apt_sources_url" testing main contrib non-free
deb-src "$apt_sources_url" testing main contrib non-free
deb http://security.debian.org/ testing/updates main contrib non-free
deb-src http://security.debian.org/ testing/updates main contrib non-free
EOFAPT
                                fi

                                report "Updating system deb packages list"
                                apt update

                                report "Installing primary package"
                                apt install --show-progress --assume-yes apt-transport-https

                                case $repository in
                                        gns3)
                                                report "Installing GNS3 PPA"
                                                apt install --show-progress --assume-yes software-properties-common
                                                add-apt-repository ppa:gns3/ppa
                                                ;;
                                        jc-manciot)
                                                report "Adding JC Manciot's Public GPG key"
                                                if [[ -z $(gpg --list-keys | grep DF7396D82BBA3684FCCADD4DB063838ED13997FD) ]]; then
                                                        for key_server in keys.openpgp.org pgpkeys.mit.edu keyserver.ubuntu.com keys.gnupg.net
                                                        do
                                                                gpg --keyserver $key_server --recv-keys DF7396D82BBA3684FCCADD4DB063838ED13997FD
                                                                if [[ $? -eq 0 ]]; then
                                                                        break
                                                                fi
                                                        done
                                                fi
                                                if [[ -z $(apt-key list 2>/dev/null | grep "DF73 96D8 2BBA 3684 FCCA  DD4D B063 838E D139 97FD") ]]; then
                                                        gpg --export --armor DF7396D82BBA3684FCCADD4DB063838ED13997FD | apt-key add -
                                                fi

                                                report "Adding stable JC Manciot's ${git_repo}"
                                                echo "deb https://git.sdxlive.com/${git_repo}/plain/Debian ${os_code_name} stable #JC Manciot ${git_repo}" > /etc/apt/sources.list.d/jean-christophe-manciot.list
                                                #"

                                                if [[ $unstable_repository_enabled == true ]]; then
                                                        report "Adding unstable JC Manciot's ${git_repo}"
                                                        echo "deb https://git.sdxlive.com/${git_repo}/plain/Debian ${os_code_name} unstable #JC Manciot ${git_repo}" >> /etc/apt/sources.list.d/jean-christophe-manciot.list
                                                        #"
                                                fi
                                                ;;
                                        *)
                                                report "$repository is not supported"
                                                exit 1
                                                ;;
                                esac
                                ;;
                        *)
                                report "Current OS/version is not supported:"
                                printf "%s\n" "Detected OS $os_distribution"
                                printf "%s\n" "Detected OS version $os_version"
                                printf "%s\n" "Detected OS code name $os_code_name"
                                report "Only the latest stable Debian release is supported"
                                exit 1
                                ;;
                esac
                ;;
        *buntu)
                git_repo=PPA
                if [[ -z "$apt_sources_url" ]]; then
                        apt_sources_url="http://archive.ubuntu.com/ubuntu/"
                fi
                case $os_version in
                        '22.04') # jammy
                                # Verifying that it is what it says it is
                                if [[ "$linux_kernel_version" < 5.15 ]]; then
                                        echo "Linux kernel version $linux_kernel_version is incompatible with $os_distribution 22.04"
                                        exit 1
                                fi
                                if [[ $new_apt_sources_enabled == true ]]; then
                                        report "Installing new apt sources"
cat <<EOFAPT > /etc/apt/sources.list
deb "$apt_sources_url" ${os_code_name} main restricted multiverse universe
deb-src "$apt_sources_url" ${os_code_name} main restricted multiverse universe
deb "$apt_sources_url" ${os_code_name}-updates main restricted multiverse universe
deb-src "$apt_sources_url" ${os_code_name}-updates main restricted multiverse universe
deb "$apt_sources_url" ${os_code_name}-security main restricted multiverse universe
deb-src "$apt_sources_url" ${os_code_name}-security main restricted multiverse universe
EOFAPT
                                fi

                                report "Updating system deb packages list"
                                apt update

                                report "Installing primary package"
                                apt install --show-progress --assume-yes apt-transport-https

                                case $repository in
                                        gns3)
                                                report "Installing GNS3 PPA"
                                                apt install --show-progress --assume-yes software-properties-common
                                                add-apt-repository ppa:gns3/ppa
                                                ;;
                                        jc-manciot)
                                                report "Adding JC Manciot's Public GPG key"
                                                if [[ -z $(gpg --list-keys | grep DF7396D82BBA3684FCCADD4DB063838ED13997FD) ]]; then
                                                        gpg --keyserver keyserver.ubuntu.com --recv-keys DF7396D82BBA3684FCCADD4DB063838ED13997FD
                                                fi
                                                if [[ -z $(apt-key list 2>/dev/null | grep "DF73 96D8 2BBA 3684 FCCA  DD4D B063 838E D139 97FD") ]]; then
                                                        gpg --export --armor DF7396D82BBA3684FCCADD4DB063838ED13997FD | apt-key add -
                                                fi

                                                report "Adding stable JC Manciot's ${git_repo}"
                                                echo "deb https://git.sdxlive.com/${git_repo}/plain/Ubuntu ${os_code_name} stable #JC Manciot Stable ${git_repo}" > /etc/apt/sources.list.d/jean-christophe-manciot.list
                                                #"

                                                if [[ $unstable_repository_enabled == true ]]; then
                                                        report "Adding unstable JC Manciot's ${git_repo}"
                                                        echo "deb https://git.sdxlive.com/${git_repo}/plain/Ubuntu ${os_code_name} unstable #JC Manciot Unstable ${git_repo}" >> /etc/apt/sources.list.d/jean-christophe-manciot.list
                                                        #"
                                                fi
                                                ;;
                                        *)
                                                report "$repository is not supported"
                                                exit 1
                                                ;;
                                esac
                                ;;
                        *)
                                report "Current OS/version is not supported:"
                                printf "%s\n" "Detected OS $os_distribution"
                                printf "%s\n" "Detected OS version $os_version"
                                printf "%s\n" "Detected OS code name $os_code_name"
                                report "Only the latest Ubuntu release is supported"
                                exit 1
                                ;;
                esac
                ;;
        *)
                report "Current OS/version is not supported:"
                printf "%s\n" "Detected OS $os_distribution"
                printf "%s\n" "Detected OS version $os_version"
                printf "%s\n" "Detected OS code name $os_code_name"
                report "Only the latest Ubuntu release is supported"
                exit 1
                ;;
esac

report "Updating system deb packages list"
apt update

report "Upgrading deb packages"
apt upgrade --yes --allow-downgrades -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold"

report "Installing, enabling & starting UFW firewall"
apt install --show-progress --assume-yes --allow-downgrades ufw
if [[ $ufw_ssh_port_enabled == true ]]; then
        report "Allowing SSH on UFW firewall for all sources"
        ufw allow ${ssh_port}/tcp
else
        ufw_ssh_port_v4_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${ssh_port}/tcp[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_ssh_port_v4_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_ssh_port_v4_rule_number
        fi
        ufw_ssh_port_v6_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${ssh_port}/tcp[[:blank:]]*\(v6\)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_ssh_port_v6_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_ssh_port_v6_rule_number
        fi
fi

systemctl enable ufw
systemctl start ufw
return_code=$?
if [[ $return_code -ne 0 ]]; then
        report "Could not start UFW Firewall service"
        report "Consult /var/log/ufw.log"
        systemctl --no-pager --full status ufw
        exit $return_code      
fi

report "Listing UFW Firewall rules"
ufw status verbose

report "Installing python setuptools"
apt install --show-progress --assume-yes --allow-downgrades python3-pip
python3 -m pip install --upgrade pip
python3 -m pip install --upgrade setuptools

report "Installing some utilities"
apt install --show-progress --assume-yes --allow-downgrades coreutils cpu-checker geoip-bin grep intel-microcode iproute2 kmod libc-bin libsystemd-dev net-tools ovmf passwd qemu-kvm uml-utilities xvfb

report "Configuring nested KVM"
echo "options kvm_intel nested=1" > /etc/modprobe.d/qemu-system-x86.conf

# "Making sure /etc/modprobe.d/* files are read"
if [[ $(lsmod | grep "kvm_intel") =~ ^kvm_intel ]]; then
        rmmod kvm_intel
fi
if [[ $(lsmod | grep "kvm ") =~ ^kvm ]]; then
        rmmod kvm
fi
getent group kvm || groupadd kvm
modprobe kvm
modprobe kvm_intel
chown --no-dereference root:kvm /dev/kvm

report "Settinbg SUID for all /usr/bin/qemu-* binaries"
chmod u+s /usr/bin/qemu-*

if [[ -z $(kvm-ok | grep "KVM acceleration can be used") ]]; then
        report "KVM acceleration cannot be used: exiting"
        exit 1
elif [[ $(cat /sys/module/kvm_intel/parameters/nested | grep Y) == Y ]]; then
        vCPUs=$(egrep -c '(vmx|svm)' /proc/cpuinfo)
        report "Nested KVM acceleration can be used on $vCPUs vCPUs"
else
        report "Nested KVM acceleration cannot be used: exiting"
        exit 1
fi

id -u ${username}
if [[ $? -eq 1 ]]; then
        report "Creating user ${username}"
        useradd -m ${username}
fi

report "Creating group ubridge"
getent group ubridge || groupadd ubridge

report "Adding ${username} to the ubridge group"
usermod -aG ubridge ${username}

report "Adding ${username} to the kvm group"
usermod -aG kvm ${username}

report "Detecting the server LAN IP address"
default_interface=$(ip route show | grep default  | head -n 1 | cut -d ' ' -f 5)
server_lan_ip_address=$(ifconfig $default_interface | grep "inet " | sed 's|^.* inet \(.*\) netmask .*|\1|g')
# Removing all spaces, tabs, line breaks
server_lan_ip_address=${server_lan_ip_address//[[:space:]]/}
echo "$server_lan_ip_address"

report "Installing GNS3 Server"
apt purge -y gns3-server
${pip3} install -U -I gns3-server
gns3_version=$(${pip3} show gns3-server | grep ^Version | sed -E 's|^Version: ([0-9]+\.[0-9]+).*$|\1|g')

report "Setting up GNS3 folders"
if [[ ! (-d /var/log/gns3) ]]; then
        mkdir -pv /var/log/gns3
fi
if [[ ! (-d /run/gns3) ]]; then
        mkdir -pv /run/gns3
fi
if [[ ! (-d /home/${username}/GNS3/Images) ]]; then
        mkdir -pv /home/${username}/GNS3/Images
fi
if [[ ! (-d /home/${username}/GNS3/Labs) ]]; then
        mkdir -pv /home/${username}/GNS3/Labs
fi
if [[ ! (-d /root/.config/GNS3) ]]; then
        mkdir -pv /root/.config/GNS3/${gns3_version}
fi
chown --no-dereference -R ${username}: /home/${username}/GNS3
chmod -R 700 /home/${username}/GNS3

report "Setting up GNS3 server"
if [[ ! (-e /root/.config/GNS3/${gns3_version}/gns3_server.conf) ]]; then
cat <<EOFC > /root/.config/GNS3/${gns3_version}/gns3_server.conf
[Server]
host = $server_lan_ip_address
port = $gns3_port 
appliances_path = /home/${username}/GNS3/Images
configs_path = /home/${username}/GNS3/configs
images_path = /home/${username}/GNS3/Images
path = /usr/local/bin/gns3server
projects_path = /home/${username}/GNS3/Labs
protocol = http
report_errors = True
symbols_path = /home/${username}/GNS3/symbols

[Qemu]
enable_kvm = True
EOFC
else
        sed --follow-symlinks -Ei "s|^host[[:blank:]]*=.*|host = ${server_lan_ip_address}|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^port[[:blank:]]*=.*|port = ${gns3_port}|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^appliances_path[[:blank:]]*=.*|appliances_path = /home/${username}/GNS3/Images|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^configs_path[[:blank:]]*=.*|configs_path = /home/${username}/GNS3/configs|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^images_path[[:blank:]]*=.*|images_path = /home/${username}/GNS3/Images|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^path[[:blank:]]*=.*|path = /usr/local/bin/gns3server|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^projects_path[[:blank:]]*=.*|projects_path = /home/${username}/GNS3/Labs|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^protocol[[:blank:]]*=.*|protocol = ${protocol}|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^report_errors[[:blank:]]*=.*|report_errors = True|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^symbols_path[[:blank:]]*=.*|symbols_path = /home/${username}/GNS3/symbols|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
        sed --follow-symlinks -Ei "s|^enable_kvm[[:blank:]]*=.*|enable_kvm = True|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf
fi

report "Starting GNS3 as a daemon"
if [[ -n $(ps -elf | grep gns3server  | grep -v grep) ]]; then
        kill $(ps -elf | grep gns3server | grep -v grep | awk '{print $4}')
fi
/usr/local/bin/gns3server --log /var/log/gns3/gns3.log --daemon
return_code=$?
if [[ $return_code -eq 0 ]]; then
        report "GNS3 installed and started with success"
else 
        report "Could not start GNS3 daemon; try gns3server --debug and please report the issue to support@sdxlive.com"
        exit $return_code      
fi

if [[ $ufw_gns3_port_enabled == true ]]; then
        report "Opening GNS3 server port on UFW firewall"
        ufw allow ${gns3_port}
        ufw allow ${gns3_console_port_range}/tcp
else
        ufw_gns3_port_v4_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_port}[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_v4_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_v4_rule_number
        fi
        ufw_gns3_port_v6_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_port}[[:blank:]]*\(v6\)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_v6_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_v6_rule_number
        fi
        ufw_gns3_port_range_v4_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_console_port_range}/tcp[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_range_v4_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_range_v4_rule_number
        fi
        ufw_gns3_port_range_v6_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_console_port_range}/tcp[[:blank:]]*\(v6\)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_range_v6_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_range_v6_rule_number
        fi
fi

report "Restarting UFW Firewall service"
systemctl restart ufw
return_code=$?
if [[ $return_code -ne 0 ]]; then
        report "Could not restart UFW Firewall service"
        report "Consult /var/log/ufw.log"
        systemctl --no-pager --full status ufw
        exit $return_code      
fi

if [[ $openvpn_enabled == true ]]; then
        if [[ $openvpn_purge_enabled == true ]]; then
                report "Purging potential previous OpenVPN Easy-RSA"
                if [[ $(systemctl is-active openvpn) == active ]]; then
                        systemctl stop openvpn
                fi
                dpkg --get-selections | grep -q "^openvpn[[:space:]]*install$"
                if [[ $? -eq 0 ]]; then
                        apt purge --show-progress --assume-yes easy-rsa openvpn
                        rm -rfv /etc/easy-rsa
                        rm -rfv /etc/openvpn
                        rm -fv /var/log/openvpn.log
                fi
        fi

        report "Installing packages for OpenVPN"
        # Easy-rsa is incompatible with openssl 3.x
        openssl_version_for_easy_rsa=$(apt-cache policy openssl | grep -P "^[[:blank:]*]+1\.[0-9]+.*$" | sed -E 's|\*| |g' | sort -rV | head -n 1 | awk '{print $1}')
        if [[ -z $openssl_version_for_easy_rsa ]]; then
                report "There is no version of openssl 1.x compatible with easy-rsa"
                exit 1
        fi
        apt install --reinstall --show-progress --assume-yes --allow-downgrades --allow-change-held-packages dnsutils easy-rsa openssl=${openssl_version_for_easy_rsa} openvpn whois
        apt-mark hold openssl

        report "Setting up OpenVPN"
        [[ -d /dev/net ]] || mkdir -p /dev/net
        [[ -c /dev/net/tun ]] || mknod /dev/net/tun c 10 200

        server_hostname=$(hostname --fqdn)
        server_wan_ip_address=$(dig @ns1.google.com -t txt o-o.myaddr.l.google.com +short | sed 's/"//g')
        server_country=$(geoiplookup ${server_wan_ip_address} | cut -d ':' -f 2 | sed -E 's|^[[:blank:]]*([^[:blank:]]+),.*$|\1|g')

        report "My detected hostname:           $server_hostname"
        report "My detected LAN IPv4 address:   $server_lan_ip_address"
        report "My detected WAN IPv4 address:   $server_wan_ip_address"
        report "My detected country:            $server_country"

        report "Creating OpenVPN server configuration"
        # Example VPN server configuration
        if [[ -e /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz ]]; then
                gunzip -c /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz > /etc/openvpn/server.conf
        elif [[ -e /usr/share/doc/openvpn/examples/sample-config-files/server.conf ]]; then
                cp -fv /usr/share/doc/openvpn/examples/sample-config-files/server.conf /etc/openvpn/server.conf
        else
                report "Could not locate server.conf below /usr/share/doc/openvpn/examples/sample-config-files"
                exit 1
        fi
        # Listening on our IP address
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*local .*$|local $server_lan_ip_address|g" /etc/openvpn/server.conf
        # Setting our IP address
        openvpn_tunnel_subnet_ip_address=$(echo "$openvpn_tunnel_ip_address" | sed -E 's|^(.+)\.[0-9]+$|\1|g').0
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*server .*$|server ${openvpn_tunnel_subnet_ip_address} 255.255.255.0|g" /etc/openvpn/server.conf
        # Setting a routed IP tunnel
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*(dev tun).*$|\1|g" /etc/openvpn/server.conf
        if [[ -n $(grep -P "^[[:blank:];#]*(dev tap.*)$" /etc/openvpn/server.conf) ]]; then
                # Commenting out the ethernet tunnel
                sed --follow-symlinks -Ei "s|^[[:blank:];#]*(dev tap.*)$|;\1|g" /etc/openvpn/server.conf
        fi
        # Setting CA certificate
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*ca .*$|ca server/ca.crt|g" /etc/openvpn/server.conf
        # Setting server certificate
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*cert .*$|cert server/${server_hostname}.crt|g" /etc/openvpn/server.conf
        # Setting server key
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*key .*$|key server/${server_hostname}.key|g" /etc/openvpn/server.conf
        # Setting cipher
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*cipher .*$|cipher AES-256-GCM|g" /etc/openvpn/server.conf
        # Setting HMAC message digest algorithm 
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*auth .*$|auth SHA256|g" /etc/openvpn/server.conf
        # Setting Diffie-Hellman as none
        sed --follow-symlinks -Ei "s|^[[:blank:];#]*dh .*$|dh none|g" /etc/openvpn/server.conf
        if [[ -n $(grep -P "^[[:blank:];#]*(tls-auth .*)$" /etc/openvpn/server.conf) ]]; then
                # Commenting out tls-auth
                sed --follow-symlinks -Ei "s|^[[:blank:];#]*(tls-auth .*)$|;\1|g" /etc/openvpn/server.conf
        fi
        if [[ -n $(grep -P "^[[:blank:];#]*(key-direction .*)$" /etc/openvpn/server.conf) ]]; then
                # Commenting out key-direction
                sed --follow-symlinks -Ei "s|^[[:blank:];#]*(key-direction .*)$|;\1|g" /etc/openvpn/server.conf
        fi
        # Allowing older compression
        # sed --follow-symlinks -i 's|^;comp-lzo|comp-lzo|g' /etc/openvpn/server.conf
        # Reducing dead timer from 2 mns to 1 mn
        sed --follow-symlinks -Ei 's|^[[:blank:];#]*keepalive .*$|keepalive 10 60|g' /etc/openvpn/server.conf
        # Logging file
        sed --follow-symlinks -Ei 's|^[[:blank:];#]*log-append .*$|log-append /var/log/openvpn.log|g' /etc/openvpn/server.conf
        # Setting up a local management interface which can be accessed with 'telnet 127.0.0.1 1195'
        printf "\n%s\n%s\n" "# Setting up a local management interface which can be accessed with 'telnet 127.0.0.1 1195'" "management 127.0.0.1 1195" >> /etc/openvpn/server.conf

        report "Creating an Easy-RSA PKI"
        # Copying over the Easy-RSA generation scripts
        cp -frv /usr/share/easy-rsa/ /etc
        cd /etc/easy-rsa
        mv vars.example vars
        # Setting all the variables for our certificate
        export EASYRSA_BATCH='batch'
        export EASYRSA_DN='cn_only'
        export EASYRSA_REQ_CN="${server_hostname}"
        export EASYRSA_ALGO='ec'
        export EASYRSA_CURVE='secp521r1'
        export EASYRSA_DIGEST='sha512'
        export EASYRSA_NS_SUPPORT='yes'
        ./easyrsa init-pki
        
        report "Generating the Certificate Authority"
        ./easyrsa build-ca
        
        find -name ca.crt -exec cp -fv {} /etc/openvpn/server \;
        chown --no-dereference root:root /etc/openvpn/server/ca.crt
        chmod 640 /etc/openvpn/server/ca.crt

        report "Generating the Certificate and Key for the Server"
        # Making a certificate/private key pair using a locally generated root certificate.
        # This will designate the certificate as a server-only certificate by setting the right attributes.
        ./easyrsa gen-req "${server_hostname}" nopass
        
        cp -fv /etc/easy-rsa/pki/private/${server_hostname}.key /etc/openvpn/server/${server_hostname}.key
        chown root:root /etc/openvpn/server/${server_hostname}.key
        chmod 640 /etc/openvpn/server/${server_hostname}.key

        report "Generating the Certificate and Key for the client"
        ./easyrsa gen-req client1 nopass
        
        cp -fv /etc/easy-rsa/pki/private/client1.key /etc/openvpn/client/
        chown root:root /etc/openvpn/client/client1.key
        chmod 640 /etc/openvpn/client/client1.key

        report "Signing the server certificate"
        ./easyrsa show-req ${server_hostname}
        ./easyrsa sign-req server ${server_hostname}

        cp -fv /etc/easy-rsa/pki/issued/${server_hostname}.crt /etc/openvpn/server/${server_hostname}.crt
        chown root:root /etc/openvpn/server/${server_hostname}.crt
        chmod 640 /etc/openvpn/server/${server_hostname}.crt
        
        report "Signing the client certificate"
        ./easyrsa show-req client1
        ./easyrsa sign-req client client1
        
        cp -fv /etc/easy-rsa/pki/issued/client1.crt /etc/openvpn/client
        chown root:root /etc/openvpn/client/client1.crt
        chmod 640 /etc/openvpn/client/client1.crt
        
        report "Allowing IPv4 Forwarding"
        sed --follow-symlinks -i 's|^.*DEFAULT_FORWARD_POLICY=".*"|DEFAULT_FORWARD_POLICY="ACCEPT"|g' /etc/default/ufw
        sed --follow-symlinks -i "s|^.*net.ipv4.ip_forward=.*|net.ipv4.ip_forward=1|g" /etc/sysctl.conf
        sysctl -p

        report "Adjusting the UFW Firewall Rules to Masquerade Client Connections"
        if [[ -z $(cat /etc/ufw/before.rules | grep -- "^-A POSTROUTING -s ${openvpn_tunnel_subnet_ip_address}/24 -o ${default_interface} -j MASQUERADE") ]]; then
                sed --follow-symlinks -i "s|^# Don't delete these required lines, otherwise there will be errors|# START OPENVPN RULES\n# NAT table rules\n*nat\n:POSTROUTING ACCEPT [0:0]\n# Allow traffic from OpenVPN client to default interface\n-A POSTROUTING -s ${openvpn_tunnel_subnet_ip_address}/24 -o ${default_interface} -j MASQUERADE\nCOMMIT\n# END OPENVPN RULES\n\n# Don't delete these required lines, otherwise there will be errors|g" /etc/ufw/before.rules
        fi

        report "Restarting OpenVPN Server service"
        systemctl enable openvpn@server
        systemctl restart openvpn@server
        return_code=$?
        if [[ $return_code -ne 0 ]]; then
                report "Could not restart OpenVPN server service"
                report "Consult /var/log/openvpn.log"
                systemctl --no-pager --full status openvpn@server
                exit $return_code      
        fi
        
        if [[ $ufw_openvpn_port_enabled == true ]]; then
                report "Opening OpenVPN port on UFW firewall"
                ufw allow ${openvpn_port}/udp
        else
                ufw_openvpn_port_v4_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${openvpn_port}/(udp|tcp)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
                if [[ $ufw_openvpn_port_v4_rule_number -ne 0 ]]; then
                        ufw --force delete $ufw_openvpn_port_v4_rule_number
                fi
                ufw_openvpn_port_v6_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${openvpn_port}/(udp|tcp)[[:blank:]]*\(v6\)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
                if [[ $ufw_openvpn_port_v6_rule_number -ne 0 ]]; then
                        ufw --force delete $ufw_openvpn_port_v6_rule_number
                fi
        fi

        report "Making GNS3 Server listen inside the OpenVPN Tunnel"
        sed --follow-symlinks -i "s|host[[:blank:]]*=.*|host = ${openvpn_tunnel_ip_address}|g" /root/.config/GNS3/${gns3_version}/gns3_server.conf

        report "Updating UFW Firewall Rules for OpenVPN & GNS3"
        ufw_gns3_port_v4_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_port}[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_v4_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_v4_rule_number
        fi
        ufw_gns3_port_v6_rule_number=$(ufw status numbered | grep -E "^[[:blank:]]*\[[[:blank:]0-9]+\][[:blank:]]*${gns3_port}[[:blank:]]*\(v6\)[[:blank:]]*ALLOW" | sed -E 's|^[[:blank:]]*\[[[:blank:]]*([0-9]+)\].*$|\1|g')
        if [[ $ufw_gns3_port_v6_rule_number -ne 0 ]]; then
                ufw --force delete $ufw_gns3_port_v6_rule_number
        fi
        ufw allow in to ${openvpn_tunnel_ip_address} port ${gns3_port}
        # In case all out are denied on pre-existing UFW configuration
        ufw allow out from ${openvpn_tunnel_ip_address}
        
        report "Restarting GNS3 daemon"
        kill $(ps -elf | grep gns3server | grep -v grep | awk '{print $4}')
        /usr/local/bin/gns3server --log /var/log/gns3/gns3.log --daemon
        return_code=$?
        if [[ $return_code -eq 0 ]]; then
                report "GNS3 installed and started with success inside the tunnel"
        else 
                report "Could not restart GNS3 daemon inside the tunnel; try gns3server --debug and please report the issue to support@sdxlive.com"
                exit $return_code      
        fi

        report "Restarting UFW Firewall service"
        systemctl restart ufw
        return_code=$?
        if [[ $return_code -ne 0 ]]; then
                report "Could not restart UFW Firewall service"
                report "Consult /var/log/ufw.log"
                systemctl --no-pager --full status ufw
                exit $return_code      
        fi
        
        report "Updating MOTD"
        gns3_user=$(cat /root/.config/GNS3/${gns3_version}/gns3_server.conf | grep -P "^[[:blank:]]*user[[:blank:]]*=[[:blank:]]*([^[:blank:]]+).*$" | sed -E 's|^[[:blank:]]*user[[:blank:]]*=[[:blank:]]*([^[:blank:]]+).*$|\1|g')
        gns3_password=$(cat /root/.config/GNS3/${gns3_version}/gns3_server.conf | grep -P "^[[:blank:]]*password[[:blank:]]*=[[:blank:]]*([^[:blank:]]+).*$" | sed -E 's|^[[:blank:]]*password[[:blank:]]*=[[:blank:]]*([^[:blank:]]+).*$|\1|g')
        if [[ $openvpn_enabled == true ]]; then
# The following cannot be prepended with spaces
cat <<EOFMOTD > /etc/update-motd.d/70-openvpn
#!/bin/sh
printf "%s\n" "__________________________________________________________________________________________________________"
printf "%s\n" "Inside the client terminal:"
printf "%s\n" "---------------------------"
printf "%s\n" "Download the OpenVPN CA certificate from the server with:"
printf "%s\n" "scp root@${server_wan_ip_address}:/etc/openvpn/server/ca.crt /etc/openvpn/server"
printf "\n"
printf "%s\n" "Download the OpenVPN client certificate from the server with:"
printf "%s\n" "scp root@${server_wan_ip_address}:/etc/openvpn/client/client1.crt /etc/openvpn/client"
printf "\n"
printf "%s\n" "Download the OpenVPN client private key (created without password) from the server with:"
printf "%s\n" "scp root@${server_wan_ip_address}:/etc/openvpn/client/client1.key /etc/openvpn/client"
printf "\n"
printf "%s\n" "On the client's top right hand side menu:"
printf "%s\n" "-----------------------------------------"
printf "%s\n" "Settings --> Network --> VPN + --> OpenVPN --> Gateway               $server_wan_ip_address"
printf "%s\n" "                                           --> CA certificate        /etc/openvpn/server/ca.crt"
printf "%s\n" "                                           --> User certificate      /etc/openvpn/client/client1.crt"
printf "%s\n" "                                           --> User private key      /etc/openvpn/client/client1.key"
printf "%s\n" "                                           --> Add"
printf "%s\n" "VPN --> Connect"
printf "\n"
printf "%s\n" "Inside the client GNS3:"
printf "%s\n" "-----------------------"
printf "%s\n" "Once the OpenVPN tunnel has been correctly setup, you should be able to define a node on the remote server"
printf "%s\n" "Defining the remote server:"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> ${protocol} - ${openvpn_tunnel_ip_address} - ${gns3_port}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication - User: ${gns3_user}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication - Password: ${gns3_password}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication -> OK"
printf "\n"
printf "%s\n" "Defining the remote node:"
printf "%s\n" "Edit Preferences -> Qemu VMs -> New -> Run this Qemu VM on a remote computer -> Run on <remote_server_name> -> Next -> Name -> Next"
printf "%s\n" "If the connection is successful, the Qemu binary name is retrieved"
printf "\n"
printf "%s\n" "Inside the server terminal:"
printf "%s\n" "---------------------------"
printf "%s\n" "Purge this MOTD with:"
printf "%s\n" "sudo rm -fv /etc/update-motd.d/70-openvpn"
printf "\n"
printf "%s\n" "At each boot of your server:"
printf "%s\n" "---------------------------"
printf "%s\n" "It is necessary to start GNS3 daemon with:"
printf "%s\n" "/usr/local/bin/gns3server --log /var/log/gns3/gns3.log --daemon"
printf "\n"
printf "%s\n" "=========================================================================================================="
EOFMOTD
        else
# The following cannot be prepended with spaces
cat <<EOFMOTD > /etc/update-motd.d/70-openvpn
#!/bin/sh
printf "%s\n" "__________________________________________________________________________________________________________"
printf "%s\n" "Inside the client GNS3:"
printf "%s\n" "-----------------------"
printf "%s\n" "Defining the remote server:"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> ${protocol} - ${server_wan_ip_address} - ${gns3_port}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication - User: ${gns3_user}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication - Password: ${gns3_password}"
printf "%s\n" "Edit Preferences -> Server -> Remote Servers -> Add -> enable authentication -> OK"
printf "\n"
printf "%s\n" "Defining the remote node:"
printf "%s\n" "Edit Preferences -> Qemu VMs -> New -> Run this Qemu VM on a remote computer -> Run on <remote_server_name> -> Next -> Name -> Next"
printf "%s\n" "If the connection is successful, the Qemu binary name is retrieved"
printf "\n"
printf "%s\n" "Inside the server terminal:"
printf "%s\n" "---------------------------"
printf "%s\n" "Purge this MOTD with:"
printf "%s\n" "sudo rm -fv /etc/update-motd.d/70-openvpn"
printf "\n"
printf "%s\n" "At each boot of your server:"
printf "%s\n" "---------------------------"
printf "%s\n" "It is necessary to start GNS3 daemon with:"
printf "%s\n" "/usr/local/bin/gns3server --log /var/log/gns3/gns3.log --daemon"
printf "\n"
printf "%s\n" "=========================================================================================================="
EOFMOTD
        fi
        chmod 754 /etc/update-motd.d/70-openvpn
fi

report "Saving UFW Firewall rules"
if [[ ! (-d /etc/iptables) ]]; then
        mkdir -v /etc/iptables
fi
iptables-save > /etc/iptables/rules.v4 && ip6tables-save > /etc/iptables/rules.v6

if [[ ($ufw_gns3_port_enabled == false) && ($openvpn_enabled == false) ]]; then
        report "GNS3 server port has to be manually opened on UFW firewall"
fi

if [[ ($ufw_openvpn_port_enabled == false) && ($openvpn_enabled == true) ]]; then
        report "OpenVPN port has to be manually opened on UFW firewall"
fi

report "You can now reboot the server"

exit 0