With the use of this tool, you can change your MAC address

Akshat0404/MAC_CHANGER

This tool has to be used on linux kernel.

Steps to use the tool:

git clone https://github.com/Akshat0404/MAC_CHANGER.git

Now open the MAC_CHANGER file.
```
./MAC_CHANGER
```
Now look for a python file named mac_changer.py in MAC_CHANGER directory using ls command.

Now run the mac_changer.py using the command;

 python3 mac_changer.py -h
 
 python3 mac_changer.py --help

The -h or –help will list out the following arguments that can be used using this tool:

 Usage: mac_changer.py [options]

    Options:

    -h, --help            show this help message and exit

    -n NETWORK_INTERFACE, --network_interface=NETWORK_INTERFACE
                           Name of the network interface of which the MAC address
                           has to be changed

    -c NEW_MAC, --new_mac=NEW_MAC
                          New MAC address

Now in the next few commands, we will see how this tool works.
Here we use -n or –network_interface to specify the network interface to which we wanna change the MAC address.

-c or –new_mac is used to specify the new mac address.

Below is a demo command;
```
 python3 mac_changer.py -n eth0 -c 00:a4:45:56:f2:6b;
```
By running this command the mac address of the network interface eth0 changes to the mac address we want

i.e. 00:a4:45:56:f2:6b and the following message will appear after the successful execution of the command;
```
 [+] Current MAC is  00:11:22:33:44:66
 [+] MAC address of eth0 is changing to 00:a4:45:56:f2:6b
 [+] MAC address has been successfully changed to  00:a4:45:56:f2:6b
```
The execution message will also include the old and new MAC address.

The same implies for the network interface wlan0.

Now if we run the ifconfig command, we can see that the MAC address has been changed to 00:a4:45:56:f2:6b;

ifconfig

    eth0: flags=xxxx<UP,BROADCAST,RUNNING,MULTICAST>  mtu xxxx

        inet xx.x.x.xx  netmask xxx.xxx.xxx.x  broadcast xx.x.x.xxx

        ether 00:a4:45:56:f2:6b  txqueuelen xxxx  (Ethernet)

        RX packets xx  bytes 46960 (45.8 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets xx  bytes 10412 (10.1 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


    lo: flags=xx<UP,LOOPBACK,RUNNING>  mtu xxxxx

        inet xxx.x.x.x  netmask xxx.x.x.x

        inet6 ::x  prefixlen xxx  scopeid 0x10<host>

        loop  txqueuelen xxxx  (Local Loopback)

        RX packets x  bytes 400 (400.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 8  bytes 400 (400.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

We all know that lo network interface doesn’t need a MAC address;

 python3 mac_changer.py -n lo -c 00:11:22:33:44:55

So if we mention in the network interface argument, the following error appears

 Usage: mac_changer.py [options]

 mac_changer.py: error: [-] This network interface does not have MAC address

We know that wlan0, lo and eth0 are the valid network interfaces among which only wlan0 and eth0 need a MAC address. So, if any other interface is mentioned other than wlan0 and eth0, the following error message shows up;
```
 python3 mac_changer.py -n wlan -c 00:00:00:00:00:00
```
In the above command I have specified wlan as network interface, which is not valid, lets see what the tool does after this command.
```
Usage: mac_changer.py [options]

mac_changer.py: error: [-] wlan is not a valid network interface. Please specify a valid network interface.
```

We also know that MAC address is of the format xx:xx:xx:xx:xx:xx, where x is any number from 0-9, lower case alphabet from a-f or upper case alphabet from A-F.

python3 mac_changer.py -n eth0 -c 00:29:4r:5h:Z2

As you can see the format of MAC address in the above command is wrong.

So, if the incorrect format of MAC address is specified, an error message would show up;

Usage: mac_changer.py [options]

mac_changer.py: error: [-] You have specified an incorrect format for MAC address. Please Enter the MAC address in the format xx:xx:xx:xx:xx:xx, where x is lower case alphabets from a-f or upper case alphabets from A-F or numbers from 0-9.

I hope that this tool helps you.