#!/bin/bash
#
# strongswan files/ipsec-vti.sh - Ansible managed: Do NOT edit this file manually!
#
# SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
# SPDX-License-Identifier: Apache-2.0

set -o nounset
set -o errexit

echo "${PLUTO_VERB}" >> /tmp/yoyo
while [[ $# -gt 1 ]]; do
	case ${1} in
		-ln|--link-name)
			TUNNEL_NAME="${2}"
			TUNNEL_PHY_INTERFACE="${PLUTO_INTERFACE}"
			shift
			;;
		-ll|--link-local)
			TUNNEL_LOCAL_ADDRESS="${2}"
			TUNNEL_LOCAL_ENDPOINT="${PLUTO_ME}"
			shift
			;;
		-lr|--link-remote)
			TUNNEL_REMOTE_ADDRESS="${2}"
			TUNNEL_REMOTE_ENDPOINT="${PLUTO_PEER}"
			shift
			;;
		-m|--mark)
			TUNNEL_MARK="${2}"
			shift
			;;
		-r|--static-route)
			TUNNEL_STATIC_ROUTE="${2}"
			shift
			;;
		*)
			echo "${0}: Unknown argument \"${1}\"" >&2
			;;
	esac
	shift
done

command_exists() {
	type "$1" >&2 2>&2
}

create_interface() {
	{
		echo "ip link add ${TUNNEL_NAME} type vti local ${TUNNEL_LOCAL_ENDPOINT} remote ${TUNNEL_REMOTE_ENDPOINT} key ${TUNNEL_MARK}"
		echo "ip addr add ${TUNNEL_LOCAL_ADDRESS} remote ${TUNNEL_REMOTE_ADDRESS} dev ${TUNNEL_NAME}"
		echo "ip link set ${TUNNEL_NAME} up mtu 1387"
	} >> /tmp/yoyo
	ip link add "${TUNNEL_NAME}" type vti local "${TUNNEL_LOCAL_ENDPOINT}" remote "${TUNNEL_REMOTE_ENDPOINT}" key "${TUNNEL_MARK}"
	ip addr add "${TUNNEL_LOCAL_ADDRESS}" remote "${TUNNEL_REMOTE_ADDRESS}" dev "${TUNNEL_NAME}"
	ip link set "${TUNNEL_NAME}" up mtu 1387
}

configure_sysctl() {
	sysctl -w net.ipv4.ip_forward=1
	sysctl -w net.ipv4.conf."${TUNNEL_NAME}".rp_filter=2
	sysctl -w net.ipv4.conf."${TUNNEL_NAME}".disable_policy=1
	sysctl -w net.ipv4.conf."${TUNNEL_PHY_INTERFACE}".disable_xfrm=1
	sysctl -w net.ipv4.conf."${TUNNEL_PHY_INTERFACE}".disable_policy=1
}

add_route() {
	IFS=',' read -ra route <<< "${TUNNEL_STATIC_ROUTE}"
    	for i in "${route[@]}"; do
	    ip route add "${i}" dev "${TUNNEL_NAME}" metric "${TUNNEL_MARK}"
	done
}

cleanup() {
        IFS=',' read -ra route <<< "${TUNNEL_STATIC_ROUTE}"
        for i in "${route[@]}"; do
            ip route del "${i}" dev "${TUNNEL_NAME}" metric "${TUNNEL_MARK}"
        done
}

delete_interface() {
	ip link set "${TUNNEL_NAME}" down
	ip link del "${TUNNEL_NAME}"
}

# main execution starts here

command_exists ip || echo "ERROR: ip command is required to execute the script, check if you are running as root, mostly to do with path, /sbin/" >&2 2>&2
command_exists iptables || echo "ERROR: iptables command is required to execute the script, check if you are running as root, mostly to do with path, /sbin/" >&2 2>&2
command_exists sysctl || echo "ERROR: sysctl command is required to execute the script, check if you are running as root, mostly to do with path, /sbin/" >&2 2>&2

case "${PLUTO_VERB}" in
	up-client)
		create_interface
		configure_sysctl
		add_route
        echo "A"
		;;
	down-client)
		cleanup
		delete_interface
		;;
esac