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 ip utility 5# 6# If you find yourself calling this script a lot, you can add the 7# the following to your /etc/sudoers file to be able to run this 8# command without entering your password each time: 9# 10# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifup 11# <my-username> ALL=NOPASSWD: /path/to/runqemu-ifdown 12# 13# Copyright (c) 2006-2011 Linux Foundation 14# 15# SPDX-License-Identifier: GPL-2.0-only 16# 17 18usage() { 19 echo "sudo $(basename $0) <tap-dev>" 20} 21 22if [ $EUID -ne 0 ]; then 23 echo "Error: This script (runqemu-ifdown) must be run with root privileges" 24 exit 1 25fi 26 27if [ $# -gt 2 ] || [ $# -lt 1 ]; then 28 usage 29 exit 1 30fi 31 32# backward compatibility 33if [ $# -eq 2 ] ; then 34 echo "Warning: native-sysroot-basedir parameter is ignored. It is no longer needed." >&2 35fi 36 37TAP=$1 38 39if ! ip tuntap del $TAP mode tap 2>/dev/null; then 40 echo "Error: Unable to run up tuntap del" 41 exit 1 42fi 43 44IPTOOL=`which ip 2> /dev/null` 45if [ "x$IPTOOL" = "x" ]; then 46 # better than nothing... 47 IPTOOL=/sbin/ip 48fi 49if [ -x "$IPTOOL" ]; then 50 if `$IPTOOL link show $TAP > /dev/null 2>&1`; then 51 $IPTOOL 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 63 64if [ -z "$OE_TAP_NAME" ]; then 65 OE_TAP_NAME=tap 66fi 67 68n=$[ (`echo $TAP | sed "s/$OE_TAP_NAME//"` * 2) + 1 ] 69dest=$[ (`echo $TAP | sed "s/$OE_TAP_NAME//"` * 2) + 2 ] 70$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 71$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 72true 73