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as_customer_cone.py
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import sys
import os
from pathsim import *
import csv
import json
import gzip
import requests
def is_included(range_start, range_end, reduced_customer_cone_prefixes):
for reduced_customer_cone_prefix in reduced_customer_cone_prefixes:
reduced_range_start_full, reduced_range_end_full = reduced_customer_cone_prefix.split(',')
reduced_range_start = [int(n) for n in reduced_range_start_full.split('.')]
reduced_range_end = [int(n) for n in reduced_range_end_full.split('.')]
if range_start[0] > reduced_range_start[0] and range_end[0] < reduced_range_end[0]:
return True
elif range_start[0] == reduced_range_start[0] and range_end[0] == reduced_range_end[0]:
if range_start[1] > reduced_range_start[1] and range_end[1] < reduced_range_end[1]:
return True
elif range_start[1] == reduced_range_start[1] and range_end[1] == reduced_range_end[1]:
if range_start[2] > reduced_range_start[2] and range_end[2] < reduced_range_end[2]:
return True
elif range_start[2] == reduced_range_start[2] and range_end[2] == reduced_range_end[2]:
if range_start[3] >= reduced_range_start[3] and range_end[3] <= reduced_range_end[3]:
return True
return False
def extend(range_start, range_end, reduced_customer_cone_prefixes):
for reduced_customer_cone_prefix in reduced_customer_cone_prefixes:
reduced_range_start_full, reduced_range_end_full = reduced_customer_cone_prefix.split(',')
reduced_range_start = [int(n) for n in reduced_range_start_full.split('.')]
reduced_range_end = [int(n) for n in reduced_range_end_full.split('.')]
# 3 cases: extend start and end, extend start, extend end
# (1) We extend the start of range and end of range
# Prepare subnet format in case it is added
range_start_full = ""
for n in range_start:
range_start_full += str(n)
range_start_full += "."
range_start_full = range_start_full[:-1]
range_end_full = ""
for n in range_end:
range_end_full += str(n)
range_end_full += "."
range_end_full = range_end_full[:-1]
prefix_to_add = range_start_full + "," + range_end_full
if range_start[0] < reduced_range_start[0] and range_end[0] > reduced_range_end[0]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[0] == reduced_range_start[0] and range_end[0] == reduced_range_end[0]:
if range_start[1] < reduced_range_start[1] and range_end[1] > reduced_range_end[1]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[1] == reduced_range_start[1] and range_end[1] == reduced_range_end[1]:
if range_start[2] < reduced_range_start[2] and range_end[2] > reduced_range_end[2]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[2] == reduced_range_start[2] and range_end[2] == reduced_range_end[2]:
if range_start[3] < reduced_range_start[3] and range_end[3] > reduced_range_end[3]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
# (2) We extend the start of range
# Prepare subnet format in case it is added
range_start_full = ""
for n in range_start:
range_start_full += str(n)
range_start_full += "."
range_start_full = range_start_full[:-1]
prefix_to_add = range_start_full + "," + reduced_range_end_full
if range_start[0] < reduced_range_start[0] <= range_end[0] <= reduced_range_end[0]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[0] == reduced_range_start[0] and range_end[0] == reduced_range_end[0]:
if range_start[1] < reduced_range_start[1] <= range_end[1] <= reduced_range_end[1]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[1] == reduced_range_start[1] and range_end[1] == reduced_range_end[1]:
if range_start[2] < reduced_range_start[2] <= range_end[2] <= reduced_range_end[2]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[2] == reduced_range_start[2] and range_end[2] == reduced_range_end[2]:
if range_start[3] < reduced_range_start[3] <= range_end[3] <= reduced_range_end[3]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
# (3) We extend the end of range
# Prepare subnet format in case it is added
range_end_full = ""
for n in range_end:
range_end_full += str(n)
range_end_full += "."
range_end_full = range_end_full[:-1]
prefix_to_add = reduced_range_start_full + "," + range_end_full
if reduced_range_start[0] <= range_start[0] <= reduced_range_end[0] < range_end[0]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[0] == reduced_range_start[0] and range_end[0] == reduced_range_end[0]:
if reduced_range_start[1] <= range_start[1] <= reduced_range_end[1] < range_end[1]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[1] == reduced_range_start[1] and range_end[1] == reduced_range_end[1]:
if reduced_range_start[2] <= range_start[2] <= reduced_range_end[2] < range_end[2]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
elif range_start[2] == reduced_range_start[2] and range_end[2] == reduced_range_end[2]:
if reduced_range_start[3] <= range_start[3] <= reduced_range_end[3] < range_end[3]:
reduced_customer_cone_prefixes.remove(reduced_customer_cone_prefix)
return False, reduced_customer_cone_prefixes
def reduce_prefixes(customer_cone_prefixes):
reduced_customer_cone_prefixes = []
i = 1
for customer_cone_prefix in customer_cone_prefixes:
range_start_full, range_end_full = customer_cone_prefix.split(',')
range_start = [int(n) for n in range_start_full.split('.')]
range_end = [int(n) for n in range_end_full.split('.')]
# If we do not extend existing subnet range and we are not included in existing subnet range, add prefix
is_extended, reduced_customer_cone_prefixes = extend(range_start, range_end, reduced_customer_cone_prefixes)
if not is_included(range_start, range_end, reduced_customer_cone_prefixes):
reduced_customer_cone_prefixes.append(customer_cone_prefix)
if i % 1000 == 0:
print("{}/{}".format(i, len(customer_cone_prefixes)))
i += 1
return reduced_customer_cone_prefixes
def compute_customer_cone(searched_as_number, out_dir):
list_as = []
customer_cone_as = []
customer_cone_prefixes = []
# Prepare the AS subnets in DictReader
if not os.path.isfile("ip2asn-v4.tsv.gz"):
subnets_as_file = urllib.URLopener()
subnets_as_file.retrieve("https://iptoasn.com/data/ip2asn-v4.tsv.gz", "ip2asn-v4.tsv.gz")
with gzip.open('ip2asn-v4.tsv.gz', 'rb') as csvfile:
asreader = csv.DictReader(csvfile, ['range_start', 'range_end', 'AS_number', 'country_code', 'AS_description'], dialect='excel-tab')
for row in asreader:
list_as.append(row)
csvfile.close()
def add_prefixes(searched_as_number):
for row in list_as:
if row['AS_number'] == searched_as_number:
prefix_to_add = row['range_start']+','+row['range_end']
if prefix_to_add not in customer_cone_prefixes:
customer_cone_prefixes.append(row['range_start']+','+row['range_end'])
url = "http://as-rank.caida.org/api/v1/asns/"+str(searched_as_number)+"/links"
#print(url)
response = requests.get(url)
#response = urllib.urlopen(url)
links = json.loads(response.text)
i = 1
for link in links["data"]:
if link["relationship"] == "customer":
customer_as = link["asn"]
if customer_as not in customer_cone_as:
customer_cone_as.append(customer_as)
add_prefixes(str(customer_as))
if searched_as_number == sys.argv[1]:
print("{}/{}".format(i, len(links["data"])))
i += 1
add_prefixes(searched_as_number)
# Following code optimizes subnets list by generating only unique range that do not overlap
# Takes a long time, and the reduction is only a few percent for the biggest ASes
"""
reduced_customer_cone_prefixes = reduce_prefixes(customer_cone_prefixes)
"""
customer_cone_file = os.path.join(out_dir,searched_as_number+"_customer_cone_prefixes")
with open(customer_cone_file, 'w') as ccf:
# Write all the prefixes to the specified file
for prefix in customer_cone_prefixes:
ccf.write("%s\n" % prefix)
ccf.close()
if __name__ == '__main__':
usage = 'Usage: as_customer_cone.py [AS number] [results_out_dir] \n\
Exports in [results_out.dir]/[AS number]_customer_cone_prefixes all the prefixes in its customer cone \
according to caida.org'
if (len(sys.argv) < 2):
print(usage)
sys.exit(1)
searched_as_number = sys.argv[1]
out_dir = sys.argv[2]
compute_customer_cone(searched_as_number, out_dir)