1 files changed, 106 insertions, 0 deletions

diff --git a/scripts/runqemu-ifup b/scripts/runqemu-ifup
new file mode 100755
index 0000000000..b5a3db964b
--- /dev/null
+++ b/scripts/runqemu-ifup
@@ -0,0 +1,106 @@
+#!/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 $TAP
+$IFCONFIG link set dev $TAP up
+
+dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
+$IFCONFIG route add to 192.168.7.$dest dev $TAP
+
+# setup NAT for tap0 interface to have internet access in QEMU
+$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