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#!/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 <gid> <num> <native-sysroot-basedir>"
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 3 ]; then
echo "Error: Incorrect number of arguments"
usage
fi
GID=$1
COUNT=$2
SYSROOT=$3
TUNCTL=$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 GID $GID..."
for ((index=0; index < $COUNT; index++)); do
echo "Creating tap$index"
ifup=`$RUNQEMU_IFUP $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
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