#!/bin/sh -e
#
# 2021 Joachim Desroches (joachim.desroches@epfl.ch)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#

os=$(cat "${__global:?}/explorer/os")

case "$os" in
'alpine'|'debian'|'ubuntu')
	confdir='/etc/bird.d'
;;
*)
	printf "Your operating system (%s) is currently not supported by __bird_radv\n" "$os" >&2
	printf "Please contribute an implementation for it if you can.\n" >&2
	exit 1
;;
esac

have_routes=no
if [ -f "${__object:?}/parameter/route" ];
then
	have_routes=yes
fi

RDNS=
if [ -f "${__object:?}/parameter/ns" ];
then
	RDNS=$(cat << EOF
	rdnss {
$(sed -e 's/^/\t\tns /' -e 's/$/;/' "${__object:?}/parameter/ns")
	};

EOF
)
fi

DNSSL=
if [ -f "${__object:?}/parameter/dnssl" ];
then
	DNSSL=$(sed -e 's/^/\tdnssl "/' -e 's/$/";/' "${__object:?}/parameter/dnssl")
fi

MTU=
if [ -f "${__object:?}/parameter/mtu" ];
then
	MTU="link mtu $(cat "${__object:?}/parameter/mtu")"
fi

__file "${confdir:?}/radv-${__object_id:?}.conf" \
	--mode 0640 --owner root --group bird \
	--source - << EOF
ipv6 table radv_routes;

protocol static {
	description "Routes advertised via RAs";
	ipv6 { table radv_routes; };

$(sed -e 's/^/\troute /' -e 's/$/ unreachable;/' "${__object:?}/parameter/route")
}

protocol radv ${__object_id:?} {
	propagate routes ${have_routes:?};
	ipv6 { table radv_routes; export all; };

	interface "$(cat "${__object:?}/parameter/interface")" {
	$MTU
	};

$RDNS

$DNSSL

}
EOF