ring.py: adding support for https://lg.ring.nlnog.net

ring.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+
+import argparse
+import itertools
+import json
+import pydot
+import random
+import time
+import urllib.request
+from dns import resolver
+
+parser = argparse.ArgumentParser(description='''
+Draw a graph from ring BGP data. A PNG file will be generated with name
+'YYYY-MM-DD-HH-MM-route.png'.
+During the generation, all the paths are printed to the console in case you want
+to see prepending and such.
+''')
+parser.add_argument('--route', dest='route', type=str,
+                    help='IPv4 or IPv6 range present in the DFZ')
+
+args = parser.parse_args()
+print(args.route)
+
+def pairwise(iterable):
+    a, b = itertools.tee(iterable)
+    next(b, None)
+    return zip(a, b)
+
+paths = {}
+
+ring_json = urllib.request.urlopen(f'http://lg02.infra.ring.nlnog.net/bgplgd/rib?prefix={args.route}')
+
+ring_data = json.load(ring_json)
+prefix = ring_data['rib'][0]['prefix']
+for peer in ring_data['rib']:
+    path = []
+    for asn in peer['aspath'].split():
+        path.append(asn)
+    path.append(prefix)
+    paths[peer['neighbor']['description']] = path
+
+#json_graph = json.JSONEncoder().encode(paths)
+nodes = {}
+edges = {}
+
+dot_graph = pydot.Dot('BGPMAP', graph_type='digraph')
+
+resolv = resolver.Resolver()
+resolv.timeout = 0.5
+
+for peer in paths:
+    print(peer, paths[peer])
+
+    string_prepended_path = ['AS'+v for v in paths[peer][:-1]]
+    print(string_prepended_path)
+
+    for previous_asn, asn in pairwise(paths[peer]):
+
+        try:
+            as_name = resolv.query(f"AS{previous_asn}.asn.cymru.com", "TXT")
+            as_name = as_name.response.answer[0].to_text().split('|')[4]
+            as_name = as_name.strip().replace("'","").replace('"','')
+        except Exception as e:
+            print(e, previous_asn)
+            as_name = ''
+
+        print(as_name)
+        edge_tuple = (previous_asn, asn)
+        color = "#%x" % random.randint(0, 16777215)
+
+        if edge_tuple not in edges:
+            edge = pydot.Edge(*edge_tuple)
+            edge.set_style("dashed")
+            edge.set_color(color)
+            dot_graph.add_edge(edge)
+            edges[edge_tuple] = edge
+
+        if previous_asn not in nodes:
+            nodes[previous_asn] = pydot.Node(previous_asn)
+            label = 'AS' + previous_asn + '\n' + as_name
+            nodes[previous_asn].set_label(label)
+            dot_graph.add_node(nodes[previous_asn])
+
+current_time = time.localtime()
+filename = '{}-{}-{}-{}-{}-{}.png'.format(
+        "{:04d}".format(current_time.tm_year),
+        "{:02d}".format(current_time.tm_mon),
+        "{:02d}".format(current_time.tm_mday),
+        "{:02d}".format(current_time.tm_hour),
+        "{:02d}".format(current_time.tm_min),
+        args.route.replace('/', '-')
+    )
+dot_graph.write_png(filename)