rdiscd.if-pre-up

#!/bin/sh

#
# Copyright 2014 Andrew Ayer
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#

RDISCD=/usr/sbin/rdiscd
RUNDIR=/var/run/rdiscd
ROOTDIR=$RUNDIR/root
RUNAS=rdiscd

interpolate () {
	if expr "$1" : "<" > /dev/null
	then
		cat < "${1#<}" || exit $?
	else
		printf "%s" "$1"
	fi
}

if [ "$ADDRFAM" = "inet6" ] && [ "$METHOD" = "manual" ] && [ "$IF_RDISCD" = "yes" ]
then
	if [ ! -d $RUNDIR ]
	then
		mkdir -p $RUNDIR
		chmod 770 $RUNDIR
	fi

	if [ -z "$IF_RDISCD_INTERFACE_ID" ]
	then
		IF_RDISCD_INTERFACE_ID=stable-privacy
	fi

	IF_RDISCD_INTERFACE_ID=`interpolate "$IF_RDISCD_INTERFACE_ID"`
	DAEMON_OPTS="-i $IF_RDISCD_INTERFACE_ID"
	if [ -n "$IF_RDISCD_INTERFACE_ID_LEN" ]
	then
		IF_RDISCD_INTERFACE_ID_LEN=`interpolate "$IF_RDISCD_INTERFACE_ID_LEN"`
		DAEMON_OPTS="$DAEMON_OPTS -l $IF_RDISCD_INTERFACE_ID_LEN"
	fi
	if [ -n "$IF_RDISCD_MACADDR" ]
	then
		IF_RDISCD_MACADDR=`interpolate "$IF_RDISCD_MACADDR"`
		DAEMON_OPTS="$DAEMON_OPTS -m $IF_RDISCD_MACADDR"
	fi
	if [ "$IF_RDISCD_INTERFACE_ID" = "stable-privacy" ]
	then
		IF_RDISCD_STABLE_PRIVACY_INTERFACE=`interpolate "$IF_RDISCD_STABLE_PRIVACY_INTERFACE"`
		DAEMON_OPTS="$DAEMON_OPTS -I ${IF_RDISCD_STABLE_PRIVACY_INTERFACE:-macaddr}"
		if [ -n "$IF_RDISCD_STABLE_PRIVACY_KEY" ]
		then
			DAEMON_OPTS="$DAEMON_OPTS -k $IF_RDISCD_STABLE_PRIVACY_KEY"
		elif [ -f /etc/rdiscd.key ]
		then
			DAEMON_OPTS="$DAEMON_OPTS -k /etc/rdiscd.key"
		fi
	fi

	PIDFILE=$RUNDIR/$IFACE.pid
	DAEMON_OPTS="$DAEMON_OPTS -p $PIDFILE -r $ROOTDIR -u $RUNAS"

	[ -d $ROOTDIR ] || mkdir -m 555 $ROOTDIR

	modprobe -q net-pf-10 > /dev/null 2>&1 || true
	echo 0 > /proc/sys/net/ipv6/conf/$IFACE/accept_ra # XXX: or should this be autoconf?
	ip link set dev $IFACE up
	start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $RDISCD -- $DAEMON_OPTS $IFACE
fi

exit 0