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76551e02ed
By default the runqemu script tries to set the group permissions on any tap device it creates. The TUNSETGROUP ioctl is not implemented on some popular host enterprise linux distributions. Internally the script will exit as follows: ++ /opt/qemux86/bitbake_build/tmp/sysroots/x86_64-linux/usr/bin/tunctl -b -g 100 + TAP='TUNSETGROUP: Invalid argument' + STATUS=1 + '[' 1 -ne 0 ']' + echo 'tunctl failed:' tunctl failed: + echo TUNSETGROUP: Invalid argument This patch implements a fallback to using the userid as the owner of the tap device which is supported by all 2.6 kernels, the default remains to try and use the groupid first. (From OE-Core rev: 3af2bc59776fb738bd795160512a2f3f49ce6d32) Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
115 lines
3.2 KiB
Bash
Executable File
115 lines
3.2 KiB
Bash
Executable File
#!/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) <uid> <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 3 ]; then
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usage
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exit 1
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fi
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USERID="-u $1"
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GROUP="-g $2"
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NATIVE_SYSROOT_DIR=$3
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TUNCTL=$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 [ $STATUS -ne 0 ]; then
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# If tunctl -g fails, try using tunctl -u, for older host kernels
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# which do not support the TUNSETGROUP ioctl
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TAP=`$TUNCTL -b $USERID 2>&1`
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STATUS=$?
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if [ $STATUS -ne 0 ]; then
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echo "tunctl failed:"
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exit 1
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fi
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fi
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IFCONFIG=`which ifconfig 2> /dev/null`
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if [ "x$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.$n/32
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$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32
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echo 1 > /proc/sys/net/ipv4/ip_forward
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$IPTABLES -P FORWARD ACCEPT
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echo $TAP
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