#!/bin/bash
# (c) 2013, 2014, f0o@devilcode.org
# (c) 2015 by Maximilian Wilhelm <max@rfc2324.org>
#
# 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/>.

ALIASES_FILE="/etc/snmp/if_aliases"

BASE='.1.3.6.1.2.1.31.1.1.1.18'
ID=$(cut -d . -f 13 <<< $2)
cache=$(ip l)

if [ -z "$ID" ]; then
	ID=0
fi

if [ "$1" = "-n" ]; then
	IFS="
"
	for dev in $(grep mtu <<<"$cache" | cut -d : -f 1|sort -n); do
		if [ "$LAST" == "$ID" ]; then
			ID=$dev
			BRK=1
			break
		else
			LAST=$dev
		fi
	done
	if [ -z "$BRK" ]; then
		exit 0
	fi
fi

IFACE=$(grep "^${ID}: " <<<"$cache" | sed 's/[:@]\s/ /g'| cut -d " " -f 2)

echo ${BASE}.${ID}
if [ "X${IFACE}" = "X" ]; then
	echo noSuchName
else
	if_alias=""

	# Try to figure out current Linux distribution to guess network configuration file
	distro=""
	if [ -x /usr/bin/distro ]; then
		distro=$(distro | cut -d " " -f 1)
	elif which lsb_release >/dev/null 2>/dev/null; then
		distro="$(lsb_release -a 2>/dev/null | awk -F: '/^Distributor ID/ { print $2 }' | tr -d '[[:space:]]')"
	fi

	if [ "${distro}" ]; then
		case "${distro}" in
			Debian)
				cnf="/etc/network/interfaces"
				# TODO: Support /etc/network/interfaces.d/
				;;

			Gentoo)
				cnf="/etc/conf.d/net"
				;;

			CentOS|RedHat|SuSE|Mandriva|Mandrake)
				cnf="/etc/sysconfig/network-scripts/ifcfg-$IFACE"
				;;

			Archlinux)
				cnf="/etc/conf.d/net-conf-$IFACE"
				;;

			*)
				cnf=""
				;;
		esac
	fi

	if [ -n "$cnf" ]; then
		if_alias=$(grep -i "^# $IFACE:" "${cnf}" | sed "s/^# $IFACE: //i")
	fi

	if [ ! "${if_alias}" -a -f "${ALIASES_FILE}" ]; then
		if_alias=$(grep -i "^$IFACE:" "${ALIASES_FILE}" | sed -e "s/^$IFACE:[[:space:]]*//")
	fi


	# FFHO local
	case "${IFACE}" in
		# Transit
		tun42)
			if_alias="Transit: Perfect Privacy"
			;;

		he-ipv6)
			if_alias="Transit: HE-IPv6"
			;;

		gre_ffrl*)
			if_alias="Transit: FFRL"
			;;

		# Peerings
		icvpn)
			if_alias="Peering: ICVPN"
			;;

		# Core
		core*)
			if_alias="Core: core-vpn"
			;;

		bb-*)
			if_alias="Core: Backbone-vpn"
			;;

		vlan1*)
			if_alias="Core: X-Connect"
			;;

		inter-gw-vpn)
			if_alias="Core: Inter-Gateway-B.A.T.M.A.N."
			;;

		# Server
		infra-srv-vpn|user-srv-vpn)
			if_alias="Server: ${IFACE}"
			;;

		vlan3*)
			if_alias="Server: Mgmt"
			;;

		# Customer
		mesh-*)
			if_alias="Cust: B.A.T.M.A.N. mesh"
			;;

		vlan23)
			if_alias="Cust: Local Mesh break-out"
			;;
	esac

	echo "string"
	echo ${if_alias}
fi

exit 0