NetworkGenie/Test_Cases/Test_Case2/TestCase2_FINACK.py

import socket

# Sending a FIN+ACK packet 

def init_socket():
    s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)
    s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
    return s    

def send_raw_packet():
    ip_header  = b'\x45\x00\x00\x28'  # Version, IHL, Type of Service | Total Length
    ip_header += b'\x00\x00\x00\x00'  # Identification | Flags, Fragment Offset
    ip_header += b'\x28\x06\xa6\xec'  # TTL = 40s, Protocol = 6 for TCP | Header Checksum
    ip_header += b'\xc0\xa8\x0a\x0a'  # Source Address: 192.168.10.10
    ip_header += b'\xc0\xa8\x0a\x14'  # Destination Address: 192.168.10.20 

    tcp_header  = b'\x09\x25\x04\xB0' # Source Port | Destination Port
    tcp_header += b'\x00\x00\x00\x00' # Sequence Number
    tcp_header += b'\x00\x00\x00\x00' # Acknowledgement Number
    tcp_header += b'\x50\x11\x00\x00' # Data Offset, Reserved, Flags | Window Size
    tcp_header += b'\xe6\x32\x00\x00' # Checksum | Urgent Pointer

    packet = ip_header + tcp_header
    return packet

if __name__=="__main__":
    dst_IP = '192.168.10.20'

    s = init_socket()

    packet = send_raw_packet()
    s.sendto(packet, (dst_IP, 0))