Created
November 9, 2019 03:34
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A shell script to toggle NIC MAC addresses between the factory default and a new random one
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| #!/bin/bash | |
| if [ "$#" -ne 1 ]; then | |
| echo "Network device must be specified" | |
| exit 1 | |
| fi | |
| DEVICE="$1" | |
| OLD_MAC=$(ifconfig | grep "$DEVICE:" -A3 | grep ether | head -1 | cut -d ' ' -f 2) | |
| NEW_MAC=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g;s/.$//') | |
| if [ -z "$OLD_MAC" ]; then | |
| echo "Invalid network device specified" | |
| exit 1 | |
| fi | |
| CONFIG_FILE="$HOME/.mac_address_$DEVICE" | |
| if [ ! -f "$CONFIG_FILE" ]; then | |
| echo "$OLD_MAC" > "$CONFIG_FILE" | |
| ORIGINAL_MAC="$OLD_MAC" | |
| else | |
| ORIGINAL_MAC=$(cat "$CONFIG_FILE") | |
| fi | |
| if [ "$OLD_MAC" == "$ORIGINAL_MAC" ]; then | |
| echo Setting new mac address: "$NEW_MAC" | |
| sudo ifconfig $DEVICE ether "$NEW_MAC" | |
| else | |
| echo Resetting mac to original: "$ORIGINAL_MAC" | |
| sudo ifconfig $DEVICE ether "$ORIGINAL_MAC" | |
| fi |
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