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	faidon
	Jun 28 2019, 2:54 PM

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	#!/usr/bin/env python3

	import re
	import pytricia
	import urllib.request

	import random
	import timeit

	anafile = "ana-invalids.txt"
	anaurl = "https://as286.net/data/ana-invalids.txt"


	def parse(iterable):
	pattern = "^(?P<prefix>[^;]+);srcAS=(?P<asn>[^;]+);altpfx=(?P<altpfx>[^;]+);.*"
	prefixes = pytricia.PyTricia(128)

	for line in iterable:
	match = re.search(pattern, line)
	if not match:
	continue

	prefix = match.group("prefix")
	if match.group("altpfx") == "NONE":
	altpfx = False
	else:
	altpfx = True

	prefixes[prefix] = altpfx

	return prefixes


	def read_and_parse_file(filename):
	with open(filename, "r") as f:
	return parse(f)


	def read_and_parse_url(url):
	response = urllib.request.urlopen(url)
	content = response.read().decode("utf-8")
	return parse(content.splitlines())


	prefixes = read_and_parse_file(anafile)
	# prefixes = read_and_parse_url(anaurl)


	def lookup(ip):
	try:
	altpfx = prefixes[ip]
	if altpfx:
	result = "invalid-but-reachable"
	else:
	result = "unreachable"
	except KeyError:
	result = "valid-or-unverified"

	return result


	# test some lookups that we
	def test_lookup():
	for ip in (
	"2.59.118.1", # unreachable
	"2.176.52.1", # invalid-but-reachable
	"1.1.1.1", # valid-or-unverified
	"2a0d:5643::1", # unreachable
	"2a0d:5084::1", # invalid-but-reachable
	"2606:4700:4700::1111", # valid-or-unverified
	):
	try:
	print(ip, lookup(ip))
	except KeyError:
	# invalid prefix?
	pass


	def random_ip(n):
	for i in range(n):
	random.randint(0, 255)
	random_ip4 = ".".join([str(random.randint(0, 255)) for j in range(0, 4)])
	yield random_ip4


	def test_random():
	for ip in random_ip(1000):
	lookup(ip)


	if __name__ == "__main__":
	test_lookup()
	n = 10
	v = timeit.timeit(
	"test_random()", setup="from __main__ import test_random", number=n
	)
	print("Execution time per run: ", v / n)

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