diff options
Diffstat (limited to 'scripts/poky-qemu-ifup')
| -rwxr-xr-x | scripts/poky-qemu-ifup | 86 |
1 files changed, 74 insertions, 12 deletions
diff --git a/scripts/poky-qemu-ifup b/scripts/poky-qemu-ifup index 3b2ed7c04..68d8d3747 100755 --- a/scripts/poky-qemu-ifup +++ b/scripts/poky-qemu-ifup @@ -1,8 +1,21 @@ -#!/bin/sh - -# QEMU network interface configuration script +#!/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. # -# Copyright (C) 2006-2007 OpenedHand Ltd. +# 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 @@ -10,24 +23,73 @@ # # 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 +# 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. -USER=$1 +usage() { + echo "$0 <gid> {uid} <native-sysroot-basedir>" + echo "Where uid is *only* included if this script complains when it's missing" +} + +if [[ $# -lt 2 || $# -gt 3 ]]; 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'" -TUNCTL=`which tunctl` -[ "$TUNCTL" = "" ] && TUNCTL=/usr/sbin/tunctl + if [[ "$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 -u $USER` +TAP=`$TUNCTL -b $GROUP 2>&1` +STATUS=$? +if [[ "$TAP" =~ "TUNSETGROUP" ]]; then + # TUNSETGROUP failed because of permissions or the kernel being too old + # Retry, falling back to a specific user + if [ "$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 + # better than nothing... + IFCONFIG=/sbin/ifconfig fi n=$[ `echo $TAP | sed 's/tap//'` + 1 ] @@ -36,7 +98,7 @@ $IFCONFIG $TAP 192.168.7.$n # setup NAT for tap0 interface to have internet access in QEMU IPTABLES=`which iptables` if [ "x$IPTABLES" = "x" ]; then - IPTABLES=/sbin/iptables + IPTABLES=/sbin/iptables fi $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.0/24 |