#!/bin/bash

# Usage:  install-tinc ip-address network-name invitation-token
# Example install-tinc 10.10.12.111 villas 134.130.169.31:12010/Pgm3usgu7X65akq_0oudfas0htjdgaHnbavWTVQ0Nq6M0JkiW3
#
# One-liner:
#
#  curl -s https://git.rwth-aachen.de/acs/public/villas/Images/raw/master/files/usr/local/bin/install-tinc | bash /dev/stdin 10.10.12.111 villas 134.130.169.31:12010/Pgm3usgu7X65akq_0oudfas0htjdgaHnbavWTVQ0Nq6M0JkiW3

DEFAULT_IP=10.10.12.$((128 + RANDOM % 127))/24
DEFAULT_NET=villas

IP=${1:-${DEFAULT_IP}}
NET=${2:-${DEFAULT_NET}}
INVITATION=$3

# Abort on error
set -e

# Add /usr/local to path if not present
if ! echo "${PATH}" | grep -q /usr/local/bin; then
	cat <<-'EOF' >> /etc/profile.d/local_path.sh
		# Set our default path
		PATH="/usr/local/bin:${PATH}"
		export PATH
	EOF

	source /etc/profile

	echo "Added /usr/local/bin to PATH"
fi

if ! command tinc --version > /dev/null; then
	echo "Tinc is not yet installed. Starting installation"

	source /etc/os-release

	case $ID in
		debian|ubuntu)
			apt-get -y install git autoconf automake build-essential libssl-dev zlib1g-dev liblzo2-dev libreadline-dev libncurses-dev libsystemd-dev texinfo
			;;

		fedora|centos|rocky|redhat)
			dnf -y install git autoconf automake make gcc openssl-devel zlib-devel lzo-devel readline-devel ncurses-devel systemd-devel texinfo
			;;
	esac

	mkdir -p /root/build
	pushd /root/build

	git clone https://github.com/gsliepen/tinc.git

	pushd /root/build/tinc

	git checkout 1.1

	autoreconf
	automake --add-missing

	./configure --sysconfdir=/etc --localstatedir=/var --with-systemd=/etc/systemd/system
	make install
	
	systemctl daemon-reload

	popd
	popd
fi

if [ -n "${NET}" ]; then

	if [ -n "${INVITATION}" ]; then
		tinc -n ${NET} join ${INVITATION}
	fi

	if [ -n "${IP}" ]; then
		cat <<- EOF > /etc/tinc/${NET}/tinc-up
			#!/bin/bash
			ip link set dev \$INTERFACE up
			ip addr add ${IP} dev \$INTERFACE
		EOF

		# Get the name of this node from the config file
		NAME=$(sed -n 's/^Name = //p' /etc/tinc/${NET}/tinc.conf)

		cat <<- EOF >> /etc/tinc/${NET}/hosts/${NAME}
			Subnet = ${IP}
		EOF

		chmod +x /etc/tinc/${NET}/tinc-up
	fi

	systemctl enable tinc@${NET}
	systemctl restart tinc@${NET}
fi