1#!/bin/bash 2# 3# QEMU network configuration script to bring down tap devices. This 4# utility needs to be run as root, and will use the tunctl binary 5# from the native sysroot. 6# 7# If you find yourself calling this script a lot, you can add the 8# the following to your /etc/sudoers file to be able to run this 9# command without entering your password each time: 10# 11# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup 12# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown 13# 14# Copyright (c) 2006-2011 Linux Foundation 15# 16# SPDX-License-Identifier: GPL-2.0-only 17# 18 19usage() { 20 echo "sudo $(basename $0) <tap-dev> <native-sysroot-basedir>" 21} 22 23if [ $EUID -ne 0 ]; then 24 echo "Error: This script (runqemu-ifdown) must be run with root privileges" 25 exit 1 26fi 27 28if [ $# -ne 2 ]; then 29 usage 30 exit 1 31fi 32 33TAP=$1 34STAGING_BINDIR_NATIVE=$2 35 36TUNCTL=$STAGING_BINDIR_NATIVE/tunctl 37if [ ! -e "$TUNCTL" ]; then 38 echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native" 39 exit 1 40fi 41 42$TUNCTL -d $TAP 43 44IFCONFIG=`which ip 2> /dev/null` 45if [ "x$IFCONFIG" = "x" ]; then 46 # better than nothing... 47 IFCONFIG=/sbin/ip 48fi 49if [ -x "$IFCONFIG" ]; then 50 if `$IFCONFIG link show $TAP > /dev/null 2>&1`; then 51 $IFCONFIG link del $TAP 52 fi 53fi 54# cleanup the remaining iptables rules 55IPTABLES=`which iptables 2> /dev/null` 56if [ "x$IPTABLES" = "x" ]; then 57 IPTABLES=/sbin/iptables 58fi 59if [ ! -x "$IPTABLES" ]; then 60 echo "$IPTABLES cannot be executed" 61 exit 1 62fi 63n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ] 64dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ] 65$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 66$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 67true 68