108 lines
2.9 KiB
Plaintext
108 lines
2.9 KiB
Plaintext
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#!/bin/bash
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#
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# QEMU network interface configuration script. This utility needs to
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# be run as root, and will use the tunctl binary from a native sysroot.
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# Note: many Linux distros these days still use an older version of
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# tunctl which does not support the group permissions option, hence
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# the need to use build system's version.
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#
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# If you find yourself calling this script a lot, you can add the
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# the following to your /etc/sudoers file to be able to run this
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# command without entering your password each time:
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#
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# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup
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# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown
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#
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# If you'd like to create a bank of tap devices at once, you should use
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# the runqemu-gen-tapdevs script instead. If tap devices are set up using
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# that script, the runqemu script will never end up calling this
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# script.
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#
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# Copyright (c) 2006-2011 Linux Foundation
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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usage() {
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echo "sudo $(basename $0) <gid> <native-sysroot-basedir>"
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}
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if [ $EUID -ne 0 ]; then
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echo "Error: This script (runqemu-ifup) must be run with root privileges"
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exit 1
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fi
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if [ $# -ne 2 ]; then
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usage
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exit 1
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fi
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GROUP="-g $1"
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NATIVE_SYSROOT_DIR=$2
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TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
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if [ ! -x "$TUNCTL" ]; then
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echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin'"
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exit 1
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fi
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TAP=`$TUNCTL -b $GROUP 2>&1`
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "tunctl failed:"
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echo $TAP
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exit 1
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fi
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IFCONFIG=`which ifconfig 2> /dev/null`
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if [ "x$IFCONFIG" = "x" ]; then
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# better than nothing...
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IFCONFIG=/sbin/ifconfig
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fi
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if [ ! -x "$IFCONFIG" ]; then
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echo "$IFCONFIG cannot be executed"
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exit 1
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fi
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ROUTE=`which route`
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if [ "x$ROUTE" = "x" ]; then
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# better than nothing...
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ROUTE=/sbin/route
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fi
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if [ ! -x "$ROUTE" ]; then
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echo "$ROUTE cannot be executed"
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exit 1
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fi
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IPTABLES=`which iptables 2> /dev/null`
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if [ "x$IPTABLES" = "x" ]; then
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IPTABLES=/sbin/iptables
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fi
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if [ ! -x "$IPTABLES" ]; then
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echo "$IPTABLES cannot be executed"
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exit 1
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fi
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n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
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$IFCONFIG $TAP 192.168.7.$n netmask 255.255.255.255
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dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
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$ROUTE add -host 192.168.7.$dest $TAP
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# setup NAT for tap0 interface to have internet access in QEMU
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$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.0/24
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echo 1 > /proc/sys/net/ipv4/ip_forward
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$IPTABLES -P FORWARD ACCEPT
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echo $TAP
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