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#!/bin/bash
if [[ $EUID > 0 ]]; then
echo "Run this script as root"
exit
fi
BRIDGE="br0"
TAP="tap0"
echo "Available network interfaces:"
interfaces=$(ip link | awk -F ': ' '{print $2}')
index=0
# Array to store interface names
declare -a interface_names
# Array to store interface types
declare -a interface_types
# Loop through each interface and display its type
for interface in $interfaces; do
type=$(ip link show $interface | grep -o 'type .*' | awk '{print $2}')
echo "$index: $interface - $type"
# Store interface name and type in arrays
interface_names[$index]=$interface
interface_types[$index]=$type
((index++))
done
# Prompt the user to select an interface
read -p "Enter the number of the interface you want to use: " selection
# Validate the user's input
if [[ ! $selection =~ ^[0-9]+$ || $selection -lt 0 || $selection -ge $index ]]; then
echo "Invalid selection. Exiting."
exit
fi
INTERFACE=${interface_names[$selection]}
INTERFACE_TYPE=${interface_types[$selection]}
echo "Selected interface: $INTERFACE - $INTERFACE_TYPE"
echo "Adding bridge $BRIDGE"
ip link add name $BRIDGE type bridge
echo "Flushing interface $INTERFACE"
ip addr flush dev $INTERFACE
echo "Setting $BRIDGE as master of $INTERFACE"
ip link set $INTERFACE master $BRIDGE
echo "Adding tap $TAP"
ip tuntap add $TAP mode tap
echo "Setting $BRIDGE as master of $TAP"
ip link set $TAP master $BRIDGE
echo "Setting $INTERFACE, $BRIDGE, and $TAP up"
ip link set up dev $INTERFACE
ip link set up dev $TAP
ip link set up dev $BRIDGE
echo "Stopping NetworkManager"
systemctl stop NetworkManager
echo "Requesting IP for $BRIDGE"
dhclient -1 -v $BRIDGE
if [ $? -eq 0 ]; then
echo "Requesting IP for $INTERFACE"
dhclient $INTERFACE
echo "Killing dhclient and starting NetworkManager"
pkill -9 dhclient
systemctl start NetworkManager
fi
# run qemu with the below arguments
#
# qemu-system-x86_64 -netdev tap,id=net0,ifname=tap0,script=no,downscript=no -device virtio-net-pci,netdev=net0
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