updates to dns resolver

blockstack_cli_0.14.1/opendig/dns_resolver.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+	Open Name System
+	~~~~~
+
+	:copyright: (c) 2014 by opennamesystem.org
+	:license: MIT, see LICENSE for more details.
+"""
+
+import socket
+import dns.resolver
+
+from opendig import DNS_SERVER
+
+ADDITIONAL_RDCLASS = 65535
+
+#----------------------------------------
+def dns_resolver(domain):
+
+	import dns.name
+	import dns.message
+	import dns.query
+	import dns.flags
+
+	domain = dns.name.from_text(domain)
+	if not domain.is_absolute():
+		domain = domain.concatenate(dns.name.root)
+
+	request = dns.message.make_query(domain, dns.rdatatype.ANY)
+	request.flags |= dns.flags.AD
+	request.find_rrset(request.additional, dns.name.root, ADDITIONAL_RDCLASS,
+		dns.rdatatype.OPT, create=True, force_unique=True)
+	
+	data = dns.query.udp(request, DNS_SERVER)
+
+	return data
+
+#----------------------------------------
+def json_data(data):
+
+	#there is no real JSON standard for DNS data
+	#it'd be nice to return json data
+
+	#for reply in data.answer:
+	#	reply = reply.to_text()
+	#	answers = reply.rsplit('\n')
+	#	for answer in answers: 
+	#		print answer
+
+	return data