#!/bin/bash
#
# Small script scanning sysfs for physical network interfaces
# and creating additional network bridges 'br-nic-[0-9]'.

. /opt/openslx/config

# do nothing if not netbooted
[ -z "$SLX_PXE_NETIF" ] && exit 1

declare -g id=1
for nic in /sys/class/net/*; do
	# The presence of this symlink pointing to the physical device
	# seems to be the better way to detect them.
	[ -h "${nic}/device" ] || continue

	# do not handle the primary interface
	[ "$SLX_PXE_NETIF" = "${nic##*/}" ] && continue

	# physical nic found, create a bridge with the same MAC
	bridge="br-nic-${id}"
	mac="$(cat "${nic}/address")"
	if ! [[ $mac =~ ^([0-9a-f]{2}:){5}[0-9a-f]{2}$ ]]; then
		echo "'$mac' does not seems like a valid MAC address."
		continue
	fi

	(
	set -e
	brctl addbr "$bridge"
	brctl stp "$bridge" 0
	ip link set addr "$mac" "$bridge"
	ip link set dev "${nic##*/}" up
	brctl addif "$bridge" "${nic##*/}"
	ip link set dev "$bridge" up
	)
	ret=$?
	if [ "$ret" != 0 ]; then
		echo "Failed to setup additional bridge '$bridge' for '$nic'."
		brctl delbr "$bridge"
		continue
	fi

	# all fine, increase counter and continue
	(( id++ ))
done

exit 0