sllv2-to-eth.py

# MIT License

# Copyright (c) 2024-2025 Michele Campus (michelecampus5@gmail.com)

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
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# The above copyright notice and this permission notice shall be included in all
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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import argparse
from scapy.all import *

# Set up command-line argument parsing
parser = argparse.ArgumentParser(description="Convert SLL2 PCAP to Ethernet PCAP with custom MAC addresses.")
parser.add_argument("input_file", help="Path to the input PCAP file (SLL2 format)")
parser.add_argument("output_file", help="Path to the output PCAP file (Ethernet format)")
parser.add_argument("--src-mac", default="aa:bb:cc:dd:ee:ff", help="Source MAC address (default: aa:bb:cc:dd:ee:ff)")
parser.add_argument("--dst-mac", default="ff:ee:dd:cc:bb:aa", help="Destination MAC address (default: ff:ee:dd:cc:bb:aa)")

args = parser.parse_args()

# Read packets from the input SLL2 PCAP file
packets = rdpcap(args.input_file)
eth_packets = []

for pkt in packets:
    if pkt.haslayer("Raw"):
        # Create a new Ethernet frame with specified MACs and original packet payload
        eth_pkt = Ether(src=args.src_mac, dst=args.dst_mac) / pkt.payload
        eth_pkt.time = pkt.time  # Keep the original timestamp
        eth_packets.append(eth_pkt)

# Write the new packets to the output Ethernet PCAP file
wrpcap(args.output_file, eth_packets)

print(f"Converted {args.input_file} to Ethernet format and saved as {args.output_file}")