#!/bin/bash
# Filename:      grml-addtun
# Purpose:       Program to create tun/tap devices and add them to a bridge
# Authors:       Michael Gebetsroither <gebi@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2.
################################################################################
# grml-addtun [OPTIONS] <tun0> <tun1> ...

set -e
#set -x

OPT_DEL_='false'
OPT_USER_=''
OPT_GROUP_=''
OPT_BRIDGE_=''

while getopts "du:g:b:h" opt; do
    case "$opt" in
        d) OPT_DEL_='true' ;;
        u) OPT_USER_="$OPTARG" ;;
        g) OPT_GROUP_="$OPTARG" ;;
        b) OPT_BRIDGE_="$OPTARG" ;;
        h) printUsage; exit 0 ;;
        ?) printUsage; exit 1 ;;
    esac
done
shift $(($OPTIND - 1))


function fromCmdline()
{
    local action_="$1"
    shift

    while (( $# != 0 )); do
        case "$1" in
            "") continue ;;
        esac
        $action_ "$1"
        shift
    done
}

function createTun()
{
    local args_=''
    if [[ $OPT_USER_ != '' ]]; then args_="$args_ -u $OPT_USER_"; fi
    if [[ $OPT_GROUP_ != '' ]]; then args_="$args_ -u $OPT_GROUP_"; fi
    tunctl -t "$1" $args_
    if [[ $OPT_BRIDGE_ != '' ]]; then
        brctl addif "$OPT_BRIDGE_" "$1"
    fi
}

function trashTun()
{
    if [[ $OPT_BRIDGE_ != '' ]]; then
        brctl delif "$OPT_BRIDGE_" "$1"
    fi
    tunctl -d "$1"
}

if [[ $OPT_DEL_ == 'false' ]]; then
    fromCmdline "createTun" "$@"
else
    fromCmdline "trashTun" "$@"
fi

# vim: filetype=sh