#!/usr/bin/openrc-run

. /opt/etc/functions.openrc

description="Creating host bonds or bridges"

# Note: extra commands are mostly for debug purposes.
extra_commands="create destroy reload"

depend()
{
	echo "  ${SVCNAME}::depend(): rc_need=\"${rc_need}\""
	provide ${SVCNAME}
}

# Descriptions for bonds and bridges are similar:
#
# name([eth1[,eth2[,...]])[=IPv4/Bits][;MTUbytes]
#
# Example of valid list (pay attention: no spaces except delimiter):
# HOST_LINKS=" \
#	name1(eth1,eth2,eth3)=10.0.0.1/16;1476 \
#	name2()=10.0.1.2/24 \
#	name3(eth4);1460 \
#	name5(eth6,eth7) \
#	name7() \
#	"

link_create()
{
	local _ltype=$1 _name=$2 _ipmask=$3 _mtu=$4 _eth _rv=0
	shift; shift; shift; shift
	if ip link show dev ${_name} > /dev/null 2>&1; then
		update_me
		ewarn "${ME}: link ${_name} already exists, destroying..."
		ip link set down dev ${_name}
		ip link del ${_name}
		if ip link show dev ${_name} > /dev/null 2>&1; then
			eerror "${ME}: unable to destroy link ${_name}"
			return 1
		fi
		ip link add ${_name} type ${_ltype} || _rv=1
	else
		#
		# <MAGIC>
		#
		# Can we create iface $IF of valid type if name $IF is not in use yet?
		# In bizzare world of Linux, the answer is "mostly".

		if ! (ip link add ${_name} type ${_ltype} > /dev/null 2>&1); then
			update_me
			if ip link show dev ${_name} > /dev/null 2>&1; then
				ewarn "${ME}: mythical iface ${_name} appeared."
				_rv=0
			else
				eerror "${ME}: not enough mana to create ${_name}."
				_rv=1
			fi
		fi
		
		#
		# </MAGIC>
		#
	fi
	[ "${_mtu}" = "ignore" ] || ip link set mtu ${_mtu} dev ${_name} || _rv=1
	[ "${_ipmask}" = "ignore" ] || ip addr add ${_ipmask} dev ${_name} || _rv=1
	for _eth in $@; do
		ip link set down dev ${_eth} || _rv=1
		[ "${_mtu}" = "ignore" ] || ip link set mtu ${_mtu} dev ${_eth} || _rv=1
		ip link set ${_eth} master ${_name} || _rv=1
		ip link set up dev ${_eth} || _rv=1
	done
	ip link set up dev ${_name} || _rv=1
	return ${_rv}
}

link_destroy()
{
	if ip link show dev $2 > /dev/null 2>&1; then
		ip link set down dev $2
		ip link del $2
	fi
	return 0
}

create()
{
	local _ltype
	if [ -n "${LINK_TYPE}" ]; then
		_ltype=${LINK_TYPE}
	else
		_ltype=$(echo ${SVCNAME} | sed -e 's/host//')
	fi
	for_all_links link_create ${_ltype} ${HOST_LINKS}
}

destroy()
{
	for_all_links link_destroy any ${HOST_LINKS}
}

reload()
{
	destroy
	create
}

start()
{
	local _rv
	ebegin "Starting \"${SVCNAME}\""
	eindent
	create
	_rv=$?
	eoutdent
	eend ${_rv}
	return ${_rv}
}

stop()
{
	ebegin "Stopping service \"${SVCNAME}\""
	destroy
	eend 0
	return 0
}