send.py

#!/usr/bin/env python3
import argparse
import sys
import socket
import random
import struct


from scapy.all import sendp, send, get_if_list, get_if_hwaddr
from scapy.all import Packet
from scapy.all import Ether, IP, UDP, TCP


def get_if():
    ifs = get_if_list()
    iface = None  # "h1-eth0"
    for i in get_if_list():
        if "eth0" in i:
            iface = i
            break
    if not iface:
        print("Cannot find eth0 interface")
        exit(1)
    return iface


def main():

    if len(sys.argv) < 3:
        print('pass 2 arguments: <destination> "<message>"')
        exit(1)

    addr = socket.gethostbyname(sys.argv[1])
    iface = get_if()

    print(f"sending on interface {iface} to {str(addr)}")
    pkt = Ether(src=get_if_hwaddr(iface), dst="08:00:00:00:02:22") / \
        IP(dst=addr) / UDP(sport=8001, dport=8002) / sys.argv[2]
    pkt.show2()
    sendp(pkt, iface=iface)


if __name__ == '__main__':
    main()