NetworkGenie/Test_Cases/Test_Case3/TestCase3_SYN.py

import socket

# Sending a SYN 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\x03\x00\x00'  # Identification | Flags, Fragment Offset
    ip_header += b'\x28\x06\xa6\xec'  # TTL = 40s, Protocol = 6 for TCP | Header Checksum
    ip_header += b'\xac\xa8\x05\x03'  # Source Address: 172.168.5.3 
    ip_header += b'\xac\xa8\x05\x04'  # Destination Address: 172.168.5.4

    tcp_header  = b'\x15\xb3\x1a\x0a' # 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\x02\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 = '172.168.5.4'

    s = init_socket()

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