import socket, sys
from struct import *


s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)

serverPort = 50000

s.bind(('', serverPort))
print ("socket binded to %s" %(serverPort))


while True:
    packet = s.recvfrom(65565)

    #packet string from tuple
	packet = packet[0]

	#take first 20 characters for the ip header
	ip_header = packet[0:20]

	#now unpack them :)
	iph = unpack('!BBHHHBBH4s4s' , ip_header)

	version_ihl = iph[0]
	version = version_ihl >> 4
	ihl = version_ihl & 0xF

	iph_length = ihl * 4

	ttl = iph[5]
	protocol = iph[6]
	s_addr = socket.inet_ntoa(iph[8]);
	d_addr = socket.inet_ntoa(iph[9]);

	print("Version : " + str(version) + " IP Header Length : " + str(ihl) + " TTL : " + str(ttl) + " Protocol : " + str(protocol) + " $

	tcp_header = packet[iph_length:iph_length+20]

	#now unpack them :)
	tcph = unpack('!HHLLBBHHH' , tcp_header)

	source_port = tcph[0]
	dest_port = tcph[1]
	sequence = tcph[2]
	acknowledgement = tcph[3]
	doff_reserved = tcph[4]
	tcph_length = doff_reserved >> 4

	print("Source Port : " + str(source_port) + " Dest Port : " + str(dest_port) + " Sequence Number : " + str(sequence) + " Acknowled$

	h_size = iph_length + tcph_length * 4
	data_size = len(packet) - h_size

	#get data from the packet
	data = packet[h_size:]

	print(data)