Transform a Scapy packet to JSON data

pkg_to_json.py

# -*- coding: utf-8 -*-

"""
This file contains the function to convert a Scapy packet to JSON representation
"""
from __future__ import print_function

import json

from collections import defaultdict


__author__ = "Daniel Garcia (cr0hn) - @ggdaniel"


def pkg_to_json(pkg):
	"""
	This function convert a Scapy packet to JSON
	
	:param pkg: A scapy package 
	:type pkg: objects
	
	:return: A JSON data
	:rtype: dict()

	"""
	results = defaultdict(dict)

	try:
		for index in range(50):

			layer = pkg[index]

			# Get layer name
			layer_tmp_name = str(layer.__dict__["aliastypes"][0])
			layer_start_pos = layer_tmp_name.rfind(".") + 1
			layer_name = layer_tmp_name[layer_start_pos:-2].lower()

			# Get the layer info
			tmp_t = {}
			for x, y in layer.__dict__["default_fields"].items():
				if y and not isinstance(y, (str, int, long, float, list, dict)):
					tmp_t[x].update(pkg_to_json(y))
				else:
					tmp_t[x] = y
			results[layer_name] = tmp_t

			try:
				tmp_t = {}
				for x, y in layer.__dict__["fields"].items():
					if y and not isinstance(y, (str, int, long, float, list, dict)):
						tmp_t[x].update(pkg_to_json(y))
					else:
						tmp_t[x] = y
				results[layer_name] = tmp_t

			except KeyError:
				# No custom fields
				pass

	except IndexError:
		# Package finish -> do nothing
		pass

	return json.dumps(results)


if __name__ == '__main__':
	from scapy.all import IP, TCP, DNS, DNSQR, UDP

	# print(pkg_to_json(IP(dst="8.8.8.8")/TCP(dport=80)/"hello World"))
	print(pkg_to_json(IP(dst="8.8.8.8")/UDP(dport=53)/DNS()/DNSQR(qname="terra.es")))

layer_tmp_name = str(layer.__dict__["aliastypes"][0]

KeyError: 'aliastypes'

In anaconda 3.5, jupyter cell, when I call the function with a packet

> KeyError                                  Traceback (most recent call last)
> <ipython-input-64-0bfed3ab77b3> in <module>
> ----> 1 pkg_to_json(pfh[1])
> 
> <ipython-input-63-50653fd7dd41> in pkg_to_json(pkg)
>      27 
>      28                         # Get layer name
> ---> 29                         layer_tmp_name = str(layer.__dict__["aliastypes"][0])
>      30                         layer_start_pos = layer_tmp_name.rfind(".") + 1
>      31                         layer_name = layer_tmp_name[layer_start_pos:-2].lower()
> 
> KeyError: 'aliastypes'

am I missing something?

Scapy changed API

where can I upload code to a json file? I'm uneducated in this department