Sending raw ethernet packets with python

raw_eth.py

from socket import socket, AF_PACKET, SOCK_RAW

ETH_P_ALL = 0x0003

print("Starting")

interface = "enx7cc2c65485c0"
# interface_mac = 7c:c2:c6:54:85:c0

# Note: When sending ethernet frames, only the following data is actually supplied at this level:
#       - Destination MAC
#       - Source MAC
#       - EtherType
#       - Payload data

arp_packet = bytearray([
    # Ethernet frame data exposed at this level (missing Preamble / Start of frame delimiter from hardware level)
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, # Destination MAC (broadcast)
    0x7c, 0xc2, 0xc6, 0x54, 0x85, 0xc0, # Source MAC
    0x08, 0x06,                         # EtherType (0x0806 for ARP)

    # ARP packet data starts here
    0x00, 0x01,                         # Hardware type (Ethernet)
    0x08, 0x00,                         # Protocol type (IPv4)
    0x06,                               # Hardware size
    0x04,                               # Protocol size
    0x00, 0x01,                         # Opcode (request)
    0x7c, 0xc2, 0xc6, 0x54, 0x85, 0xc0, # Sender MAC address
    0xC0, 0xA8, 0x01, 0x02,             # Sender IP address
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, # Target MAC address (unknown)
    0xC0, 0xA8, 0x01, 0x01,             # Target IP address

    # No padding or frame check sequence CRC is added here either
])

ethernet_frame = bytearray([
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  # Destination MAC (broadcast)
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55,  # Source MAC
    0x12, 0x34,                          # Custom EtherType (0x1234)
    # Payload (just some test data)
    0xde, 0xad, 0xbe, 0xef                # Example payload
])

# AF_PACKET is a low-level interface to network devices
# SOCK_RAW, when combined with AF_PACKET, refers to raw ethernet packets
with socket(AF_PACKET, SOCK_RAW) as raw_socket:
    print(raw_socket)
    print(f"Binding to interface: {interface}")
    raw_socket.bind((interface, ETH_P_ALL))

    print("Sending raw ARP packet")
    bytes_sent = raw_socket.send(arp_packet)
    # bytes_sent = raw_socket.send(ethernet_frame)
    print(f"Sent {bytes_sent} bytes to the interface")