wlan2eth/bridge/nat/clone-client-mac.sh

#!/bin/bash

# ==============================================================================
# Config and setup

SOURCE=${BASH_SOURCE[0]}
while [ -L "$SOURCE" ]; do
  DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)
  SOURCE=$(readlink "$SOURCE")
  [[ $SOURCE != /* ]] && SOURCE=$DIR/$SOURCE
done
DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)

if [[ -f "$DIR/../../config/nat-config.sh" ]]; then
  . "$DIR/../../config/nat-config.sh"
else
  echo "$DIR/../../config/nat-config.sh missing!"
  exit 1
fi

if [ "$(id -u)" -ne 0 ]; then
  echo 'This script must be run as root.' >&2
  exit 1
fi

. "$DIR/get_client_mac_address.sh"

# ==============================================================================

MAC_OTHR=$(get_client_mac_address $ETH_IFACE)
if [ -z "$MAC_OTHR" ]; then
  echo "Bridged client not found! MAC address was empty."
  exit 1
else
  echo "Cloning MAC: $MAC_OTHR"
fi

# Clone MAC address of the wired-only device to the WiFi device
ifconfig $WLAN_IFACE down
ifconfig $WLAN_IFACE hw ether $MAC_OTHR
ifconfig $WLAN_IFACE up
echo "Set $WLAN_IFACE MAC to $MAC_OTHR"

while true; do
  WLAN_IFACE_IP=$(ip -4 -br addr show $WLAN_IFACE | grep -Po "\\d+\\.\\d+\\.\\d+\\.\\d+")
  if [ -n "${WLAN_IFACE_IP}" ]; then
    echo "Got DHCP IP: $WLAN_IFACE_IP"
    break
  fi
  echo "Waiting for $WLAN_IFACE to get an IP..."
  sleep 5
done