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- #!/bin/bash
- #
- # QEMU network interface configuration script. This utility needs to
- # be run as root, and will use the tunctl binary from a native 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 build system's version.
- #
- # If you find yourself calling this script a lot, you can add the
- # the following to your /etc/sudoers file to be able to run this
- # command without entering your password each time:
- #
- # <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup
- # <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown
- #
- # If you'd like to create a bank of tap devices at once, you should use
- # the runqemu-gen-tapdevs script instead. If tap devices are set up using
- # that script, the runqemu script will never end up calling this
- # script.
- #
- # Copyright (c) 2006-2011 Linux Foundation
- #
- # 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 "sudo $(basename $0) <gid> <native-sysroot-basedir>"
- }
- if [ $EUID -ne 0 ]; then
- echo "Error: This script (runqemu-ifup) must be run with root privileges"
- exit 1
- fi
- if [ $# -ne 2 ]; then
- usage
- exit 1
- fi
- GROUP="-g $1"
- NATIVE_SYSROOT_DIR=$2
- TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
- if [ ! -x "$TUNCTL" ]; then
- echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin'"
- exit 1
- fi
- TAP=`$TUNCTL -b $GROUP 2>&1`
- STATUS=$?
- if [ $STATUS -ne 0 ]; then
- echo "tunctl failed:"
- echo $TAP
- exit 1
- fi
- IFCONFIG=`which ifconfig`
- if [ "x$IFCONFIG" = "x" ]; then
- # better than nothing...
- IFCONFIG=/sbin/ifconfig
- fi
- ROUTE=`which route`
- if [ "x$ROUTE" = "x" ]; then
- # better than nothing...
- ROUTE=/sbin/route
- fi
- n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
- $IFCONFIG $TAP 192.168.7.$n
- dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
- $ROUTE add -host 192.168.7.$dest $TAP
- # setup NAT for tap0 interface to have internet access in QEMU
- IPTABLES=`which iptables`
- if [ "x$IPTABLES" = "x" ]; then
- IPTABLES=/sbin/iptables
- fi
- $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.0/24
- echo 1 > /proc/sys/net/ipv4/ip_forward
- $IPTABLES -P FORWARD ACCEPT
- echo $TAP
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