Add support for configuring the DNS-based ASN → name mapping service.

lg.cfg

@@ -23,4 +23,7 @@ AS_NUMBER = {
 
 #WHOIS_SERVER = "whois.foo.bar"
 
+# DNS zone to query for ASN -> name mapping
+ASN_ZONE = "asn.cymru.com"
+
 SESSION_KEY = '\xd77\xf9\xfa\xc2\xb5\xcd\x85)`+H\x9d\xeeW\\%\xbe/\xbaT\x89\xe8\xa7'

lg.py

@@ -29,7 +29,7 @@ from urllib import quote, unquote
 import json
 import random
 
-from toolbox import mask_is_valid, ipv6_is_valid, ipv4_is_valid, resolve, save_cache_pickle, load_cache_pickle, get_asn_from_as, unescape
+from toolbox import mask_is_valid, ipv6_is_valid, ipv4_is_valid, resolve, save_cache_pickle, load_cache_pickle, unescape
 #from xml.sax.saxutils import escape
 
 
@@ -46,6 +46,12 @@ file_handler.setLevel(getattr(logging, app.config["LOG_LEVEL"].upper()))
 app.logger.addHandler(file_handler)
 
 
+def get_asn_from_as(n):
+    asn_zone = app.config.get("ASN_ZONE", "asn.cymru.com")
+    data = resolve("AS%s.%s" % (n, asn_zone) ,"TXT").replace("'","").replace('"','')
+    return [ field.strip() for field in data.split("|") ]
+
+
 def add_links(text):
     """Browser a string and replace ipv4, ipv6, as number, with a
     whois link """

toolbox.py

@@ -27,10 +27,6 @@ import xml.parsers.expat
 def resolve(n, q):
 	return str(resolver.query(n,q)[0])
 
-def get_asn_from_as(n):
-    data = resolve("AS%s.asn.cymru.com" % n ,"TXT").replace("'","").replace('"','')
-    return [ field.strip() for field in data.split("|") ]
-
 def mask_is_valid(n):
 	if not n: 
 		return True