diff options
Diffstat (limited to 'meta-sota/scripts/runqemu-ifup')
| -rwxr-xr-x | meta-sota/scripts/runqemu-ifup | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/meta-sota/scripts/runqemu-ifup b/meta-sota/scripts/runqemu-ifup new file mode 100755 index 0000000..d9bd894 --- /dev/null +++ b/meta-sota/scripts/runqemu-ifup @@ -0,0 +1,121 @@ +#!/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) <uid> <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 3 ]; then + usage + exit 1 +fi + +USERID="-u $1" +GROUP="-g $2" +NATIVE_SYSROOT_DIR=$3 + +TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl +if [ ! -x "$TUNCTL" ]; then + echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin', please bitbake qemu-helper-native" + exit 1 +fi + +TAP=`$TUNCTL -b $GROUP 2>&1` +STATUS=$? +if [ $STATUS -ne 0 ]; then +# If tunctl -g fails, try using tunctl -u, for older host kernels +# which do not support the TUNSETGROUP ioctl + TAP=`$TUNCTL -b $USERID 2>&1` + STATUS=$? + if [ $STATUS -ne 0 ]; then + echo "tunctl failed:" + exit 1 + fi +fi + +IFCONFIG=`which ip 2> /dev/null` +if [ "x$IFCONFIG" = "x" ]; then + # better than nothing... + IFCONFIG=/sbin/ip +fi +if [ ! -x "$IFCONFIG" ]; then + echo "$IFCONFIG cannot be executed" + exit 1 +fi + +IPTABLES=`which iptables 2> /dev/null` +if [ "x$IPTABLES" = "x" ]; then + IPTABLES=/sbin/iptables +fi +if [ ! -x "$IPTABLES" ]; then + echo "$IPTABLES cannot be executed" + exit 1 +fi + +n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ] +$IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP +STATUS=$? +if [ $STATUS -ne 0 ]; then + echo "Failed to set up IP addressing on $TAP" + exit 1 +fi +$IFCONFIG link set dev $TAP up +STATUS=$? +if [ $STATUS -ne 0 ]; then + echo "Failed to bring up $TAP" + exit 1 +fi + +dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ] +$IFCONFIG route add to 192.168.7.$dest dev $TAP +STATUS=$? +if [ $STATUS -ne 0 ]; then + echo "Failed to add route to 192.168.7.$dest using $TAP" + exit 1 +fi + +# setup NAT for tap0 interface to have internet access in QEMU +$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 +$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 +echo 1 > /proc/sys/net/ipv4/ip_forward +echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp +$IPTABLES -P FORWARD ACCEPT + +echo $TAP |