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-rwxr-xr-xscripts/runqemu-gen-tapdevs100
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1#!/bin/bash
2#
3# Create a "bank" of tap network devices that can be used by the
4# runqemu script. This script needs to be run as root, and will
5# use the tunctl binary from the build system sysroot. Note: many Linux
6# distros these days still use an older version of tunctl which does not
7# support the group permissions option, hence the need to use the build
8# system provided version.
9#
10# Copyright (C) 2010 Intel Corp.
11#
12# This program is free software; you can redistribute it and/or modify
13# it under the terms of the GNU General Public License version 2 as
14# published by the Free Software Foundation.
15#
16# This program is distributed in the hope that it will be useful,
17# but WITHOUT ANY WARRANTY; without even the implied warranty of
18# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19# GNU General Public License for more details.
20#
21# You should have received a copy of the GNU General Public License along
22# with this program; if not, write to the Free Software Foundation, Inc.,
23# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24
25usage() {
26 echo "Usage: sudo $0 <uid> <gid> <num> <native-sysroot-basedir>"
27 echo "Where <uid> is the numeric user id the tap devices will be owned by"
28 echo "Where <gid> is the numeric group id the tap devices will be owned by"
29 echo "<num> is the number of tap devices to create (0 to remove all)"
30 echo "<native-sysroot-basedir> is the path to the build system's native sysroot"
31 exit 1
32}
33
34if [ $EUID -ne 0 ]; then
35 echo "Error: This script must be run with root privileges"
36 exit
37fi
38
39if [ $# -ne 4 ]; then
40 echo "Error: Incorrect number of arguments"
41 usage
42fi
43
44TUID=$1
45GID=$2
46COUNT=$3
47SYSROOT=$4
48
49TUNCTL=$SYSROOT/usr/bin/tunctl
50if [[ ! -x "$TUNCTL" || -d "$TUNCTL" ]]; then
51 echo "Error: $TUNCTL is not an executable"
52 usage
53fi
54
55SCRIPT_DIR=`dirname $0`
56RUNQEMU_IFUP="$SCRIPT_DIR/runqemu-ifup"
57if [ ! -x "$RUNQEMU_IFUP" ]; then
58 echo "Error: Unable to find the runqemu-ifup script in $SCRIPT_DIR"
59 exit 1
60fi
61
62IFCONFIG=`which ip 2> /dev/null`
63if [ -z "$IFCONFIG" ]; then
64 # Is it ever anywhere else?
65 IFCONFIG=/sbin/ip
66fi
67if [ ! -x "$IFCONFIG" ]; then
68 echo "$IFCONFIG cannot be executed"
69 exit 1
70fi
71
72# Ensure we start with a clean slate
73for tap in `$IFCONFIG link | grep tap | awk '{ print \$2 }' | sed s/://`; do
74 echo "Note: Destroying pre-existing tap interface $tap..."
75 $TUNCTL -d $tap
76done
77
78echo "Creating $COUNT tap devices for UID: $TUID GID: $GID..."
79for ((index=0; index < $COUNT; index++)); do
80 echo "Creating tap$index"
81 ifup=`$RUNQEMU_IFUP $TUID $GID $SYSROOT 2>&1`
82 if [ $? -ne 0 ]; then
83 echo "Error running tunctl: $ifup"
84 exit 1
85 fi
86done
87
88if [ $COUNT -gt 0 ]; then
89 echo "Note: For systems running NetworkManager, it's recommended"
90 echo "Note: that the tap devices be set as unmanaged in the"
91 echo "Note: NetworkManager.conf file. Add the following lines to"
92 echo "Note: /etc/NetworkManager/NetworkManager.conf"
93 echo "[keyfile]"
94 echo "unmanaged-devices=interface-name:tap*"
95fi
96
97# The runqemu script will check for this file, and if it exists,
98# will use the existing bank of tap devices without creating
99# additional ones via sudo.
100touch /etc/runqemu-nosudo