def validatePacket(packet):
if not IP.validateChecksumZero(packet[0:20]):
return False, "IP"
else:
print "IP VALIDATION: SUCCESS"
ip_header = IP.unpackHeader(packet[0:20])
#Get Length of IP header
ip_ver = ip_header[0] >> 4
ip_header_length = ip_header[0] & 0xF
ip_length = ip_header_length * 4
tcp_packet = packet[ip_length:]
pseudo = pack('!4s4sBBH', ip_header[8], ip_header[9], 0, socket.IPPROTO_TCP, len(tcp_packet))
if not TCP.validateChecksumZero(pseudo + tcp_packet):
return False, "TCP"
else:
print "TCP VALIDATION: SUCCESS"
return True, ""
