#!/bin/bash # # Create a "bank" of tap network devices that can be used by the # runqemu script. This script needs to be run as root, and will # use the tunctl binary from the build system sysroot. Note: many Linux # distros these days still use an older version of tunctl which does not # support the group permissions option, hence the need to use the build # system provided version. # # Copyright (C) 2010 Intel Corp. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 as # published by the Free Software Foundation. # # 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, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. usage() { echo "Usage: sudo $0 <uid> <gid> <num> <native-sysroot-basedir>" echo "Where <uid> is the numeric user id the tap devices will be owned by" echo "Where <gid> is the numeric group id the tap devices will be owned by" echo "<num> is the number of tap devices to create (0 to remove all)" echo "<native-sysroot-basedir> is the path to the build system's native sysroot" exit 1 } if [ $EUID -ne 0 ]; then echo "Error: This script must be run with root privileges" exit fi if [ $# -ne 4 ]; then echo "Error: Incorrect number of arguments" usage fi TUID=$1 GID=$2 COUNT=$3 SYSROOT=$4 TUNCTL=$SYSROOT/usr/bin/tunctl if [[ ! -x "$TUNCTL" || -d "$TUNCTL" ]]; then echo "Error: $TUNCTL is not an executable" usage fi SCRIPT_DIR=`dirname $0` RUNQEMU_IFUP="$SCRIPT_DIR/runqemu-ifup" if [ ! -x "$RUNQEMU_IFUP" ]; then echo "Error: Unable to find the runqemu-ifup script in $SCRIPT_DIR" exit 1 fi IFCONFIG=`which ifconfig 2> /dev/null` if [ -z "$IFCONFIG" ]; then # Is it ever anywhere else? IFCONFIG=/sbin/ifconfig fi if [ ! -x "$IFCONFIG" ]; then echo "$IFCONFIG cannot be executed" exit 1 fi # Ensure we start with a clean slate for tap in `$IFCONFIG | grep ^tap | awk '{ print \$1 }'`; do echo "Note: Destroying pre-existing tap interface $tap..." $TUNCTL -d $tap done echo "Creating $COUNT tap devices for UID: $TUID GID: $GID..." for ((index=0; index < $COUNT; index++)); do echo "Creating tap$index" ifup=`$RUNQEMU_IFUP $TUID $GID $SYSROOT 2>&1` if [ $? -ne 0 ]; then echo "Error running tunctl: $ifup" exit 1 fi done # The runqemu script will check for this file, and if it exists, # will use the existing bank of tap devices without creating # additional ones via sudo. touch /etc/runqemu-nosudo