poky/scripts/poky-qemu-ifup

#!/bin/bash

QEMU network interface configuration script. This utility needs to

be run as root, and will use the tunctl binary from a Poky 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 Poky's version.

If this script is being run standalone in order to set up a bank of tap

devices for later qemu use, then a group id must be the first argument.

The resulting tap device will be group-owned by this group, and qemu

users must be members of this group.

If the kernel is too old to support TUNSETGROUP, then a user must be passed

in as the second argument, the tap device will be owned by that user, and

only that user will be able to use it.

Copyright (c) 2006-2010 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 "$0 {uid} " echo "Where uid is only included if this script complains when it's missing" }

if $# -lt 2 ; then usage exit 1 fi

USER="" GROUP="-g $1" if [ $# -eq 2 ]; then NATIVE_SYSROOT_DIR=$2 else USER=$2 NATIVE_SYSROOT_DIR=$3 fi

TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl if [ ! -e "$TUNCTL" ]; then echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin'"

if [[ "$NATIVE_SYSROOT_DIR" =~ ^\/opt\/poky ]]; then
	echo "This shouldn't happen - something is wrong with your toolchain installation"
else
	echo "Have you run 'bitbake qemu-helper-native'?"
fi

exit 1

fi

TAP=$TUNCTL -b $GROUP 2>&1 STATUS=$? if ; then # TUNSETGROUP failed because of permissions or the kernel being too old # Retry, falling back to a specific user if [ "$USER" = "" ]; then echo "TUNSETGROUP failed - add a username to the command line in order" echo "to have the tap device owned by that user" exit 1 fi TAP=$TUNCTL -b -u $USER 2>&1 STATUS=$? # Force this to appear on stderr in order that the user sees it if this # is running from poky-qemu-internal and in order to avoid having this # output confuse it. echo "Only user $USER will be able to use $TAP - upgrade the kernel to " 1>&2 echo "2.6.23 or later in order to allow group access to tap devices" 1>&2 fi 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