add mac changer

Author: Nibba2018

Python/Mac-Changer/README.md

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+# MAC address changer
+A media access control address (MAC address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth. The following cross platform script can change the MAC address of a device.
+
+## Running script
+  * Run `python mac-change.py <New MAC address>`
+  * for e.g `python mac-change.py 2e:3e:3e:5f:5a:6f`
+
+## Output
+
+```txt
+Old MAC address: XX:XX:XX:XX:XX:XX
+New MAC address: 2e:3e:3e:5f:5a:6f
+```
+
+Old MAC address is printed in Yellow and new MAC address is printed in green.

Python/Mac-Changer/mac-change.py

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+import sys
+import subprocess
+import os
+import re
+
+# Check if the Operating System is Windows or not.
+WINDOWS = os.name != 'posix'
+mac_regex = ("^([0-9A-Fa-f]{2}[:-])" +
+             "{5}([0-9A-Fa-f]{2})|" +
+             "([0-9a-fA-F]{4}\\." +
+             "[0-9a-fA-F]{4}\\." +
+             "[0-9a-fA-F]{4})$")
+
+# Compile a regular expression to validate MAC addresses.
+mac_regex = re.compile(mac_regex)
+
+# Check if MAC address was supplied as a commandline argument.
+if len(sys.argv) < 2:
+    sys.exit("Enter new MAC address as a commandline argument.")
+
+# Check if the supplied MAC address was valid or not.
+new_mac = sys.argv[1]
+if not re.search(mac_regex, new_mac):
+    sys.exit("Please enter a valid MAC address.")
+
+# Perform different operations based on the operating system.
+if not WINDOWS:
+    # Get the output containing necessary information.
+    output = subprocess.getoutput('ip link show | grep "link/ether"').split()
+
+    # Look for a valid MAC address.
+    for entry in output:
+        if re.search(mac_regex, entry):
+            prev_mac = re.search(mac_regex, entry).group()
+            break
+
+    # Extract the nic device associated with the MAC address.
+    nic_device = subprocess.getoutput('ip addr show | grep "altname"').split()[1]
+
+    # Perform actions to change MAC address.
+    subprocess.call(f'sudo ip link set dev {nic_device} down')
+    subprocess.call(f'sudo ip link set dev {nic_device} address {new_mac}')
+    subprocess.call(f'sudo ip link set dev {nic_device} up')
+
+else:
+    # Get the appropriate output.
+    output = subprocess.getoutput('getmac /v | findstr Device').split()
+
+    # Check for a valid MAC address in output.
+    for entry in output:
+        if re.search(mac_regex, entry):
+            prev_mac = re.search(mac_regex, entry).group()
+            break
+
+    # Extract the associated nic device.
+    nic_device = output[-1][output[-1].find('{'):]
+
+    # Perform actions to change MAC address.
+    subprocess.call('reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\%s\0004 /v NetworkAddress /d %s /f'%format(nic_device, new_mac.replace(":", "")))
+
+
+print(f"Old MAC address: \033[93m{prev_mac}\033[0m")
+print(f"New Mac address: \033[92m{new_mac}\033[0m")